liquid crystal display, or LCD (Liquid Crystal Display), the flat thin display device, which consists of a number of color or black and white pixels, light source or reflector placed on the front side. LCD power consumption is very low, so much favored by engineers, for battery-powered electronic devices. Its main principle is based on current liquid crystal molecules to stimulate the point, line, surface and compose the picture with the back of the lamp.
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LCD LCD early development of LCD features the origin of the body is thin, space-saving energy-saving, low-E does not produce heat, not to hurt the soft benefits eye health screen resolution and display size of the principle of classification of liquid crystal Physical properties of the principle of monochrome LCD color LCD display works application and use of new technology LCD LCD LCD Notice requirements for air Q & ALCD LCD pixel widescreen LCD monitor is burned in the end how small the font to use LCD display maintenance and repair common sense to avoid the water to avoid working long hours to avoid the profile response time for how fast you need to pay attention to the brightness contrast, other parameters have to pay attention to technical performance parameters 1 visual area 2 pitch 3 color degrees 4 contrast (contrast ratio) 5 Brightness 6 signal response time 7 Viewing Angle LCD screen technology wide viewing angle LED backlight technology become more mature players favorite 3D LCD technology into the energy saving technology into the most important indicator of LCD liquid crystal display LCD originLCD (Liquid Crystal Display), for Many users may be a term is not new, but there is the history of this technology may be far beyond our imagination - in the 19th century, the Austrian botanist discovered the liquid crystal, liquid crystal that , that is a substance also has a flow of liquid crystals and a similar arrangement of features. In the electric field, liquid crystal molecules are arranged will produce change. Thus affecting its optical properties, a phenomenon known as electro-optic effect. The use of liquid crystal electro-optic effect, in the last century British scientists create first a liquid crystal display that is LCD. Today's liquid crystal display is widely used linear fixed LCD, micro-look at it if we will find it especially as a cotton swab. Compared with the traditional CRT, LCD is not only small, thin (the thickness of the current 14.1-inch machine may be only 5 cm), light weight, low energy consumption (1 to 10 microwatts / square centimeter), low voltage (1.5 to 6V) and no radiation, no flicker and can be matched directly with CMOS integrated circuits. Because many advantages, LCD from 1998 into the desktop applications. . The first operational LCD based on the dynamic scattering mode (Dynamic Scattering Mode, DSM), RCA's George Herrmann's team has developed this LCD. Herrmann created Optel company, the company developed a series based on this technology of LCD. December 1970, the rotation of nematic liquid crystal FET characteristics cents in Switzerland and Helfrich Hoffmann - Le Luoke central laboratory registered as patents. In 1969, James Ferguson, Ohio Kent State University in the United States (Ohio University) found the rotation of nematic liquid crystal field effect in February 1971 and registered in the U.S. the same patent. In 1971 his company (ILIXCO) produced the first based on this feature of the LCD, quickly replaced the poor performance of the DSM-type LCD. In 1985, after finding it had a commercial value, in 1973, Japan's Sharp Corporation produced the first electronic calculator it used figures. Now, LCD notebook and handheld computer's main display device, the projector, it also plays a very important role, and it began to penetrate the desktop monitor market. LCD early development has been the pursuit of a more perfect visual enjoyment are our goals desktop display devices, display technologies in recent years, the development review process, we find that it is around the same theme - comfort! As in recent years, suddenly the emerging new products, liquid crystal display has been fully replaced by a bulky CRT monitor display device is now mainstream. However, the development of liquid crystal display of the road is not smooth sailing as we had imagined. Here, we review new and old players to LCD development in recent years, the road twists and turns hard. LCD early development (1986 to 2001) - high cost inhibit its development path in the early immature technology, LCD is mainly used in digital watches, calculators and other areas we usually say the LCD, it's the English full name Liquid Crystal Display, is directly translated into Chinese liquid crystal display, referred to as liquid crystal displays. LCD is an almost completely transparent material. It determines the molecular arrangement of the path of light through the LCD. To the 1960s, it was found that charge to the liquid crystal will change its molecular arrangement, and then causing distortions or refraction of light, which led people to invent the idea of liquid crystal display device. The world's first liquid crystal display devices in the early 1970s, called TN-LCD (twisted nematic) LCD display. Although the display is monochrome, it still extended to a spreadsheet, calculator and other fields. LCD features a thin body, saving space and more bulky than CRT monitors, LCD monitors as long as the former one-third of the space. Power, it does not produce high-temperature products are low-power, can be done completely without heat (some of the major electricity and heat present in the backlight lamp or LED), and CRT monitors, imaging technology is inevitable due to high temperature. Low-E, the health benefits of radiation far below the LCD monitor CRT monitor (only low, not entirely without radiation, electron products have more or less radiation), which for all people who work at the computer a boon . Not to hurt the eye is different from the soft screen CRT technology, LCD screen does not flicker, the monitor can reduce damage to the eyes, eye fatigue. LCD green, its energy consumption compared to traditional CRT, is simply too small (17''200W power probably less); gradually cause for the recent attention of people and noise pollution also missed it, because it determine the characteristics of their work that it does not produce noise (kind of like the side for the use of computers, while the rhythmic beat of the users monitor the noise, here not to be considered); LCD display is also a good heat than the lower, long-term use will not have grilled hot feeling, which is unparalleled display before, the previous display, but valuable, especially in summer, home air conditioning, fans had for its services to its cooling. Use the LCD monitor virtually down the temperature for the atmosphere, but also to prevent the increasingly contribute to atmospheric warming. While reducing radiation, reduce environmental pollution. Of course, not less radiation environment of this index, although we can not say there is no LCD display on the radiation, but large relative to the radiation CRT, as well as everyday household appliances of the radiation, the liquid crystal display just that little bit of radiation is negligible . Now the times but it is still analog era, the era of the future from the current development trend of the digital age. Monitor intelligence operations, digital control, digital display is a necessary condition for future display. As the digital era, digital technology will completely replace analogue technology, LCD will soon replace the current analog CRT monitors. But from another point of LCD digital interfaces are not widespread, far to the applications. In theory, pure digital liquid crystal display device, and should also be connection to the host computer is to use digital interface, the advantages of using digital interface is self-evident. First, you can reduce the analog-digital conversion process of signal loss and interference; reduction corresponding to the conversion circuits and components; followed by need for clock frequency, the vector of adjustment. However, the market most of the LCD interface is analog interface, there is a transmission signal is susceptible to interference, display the internal need to add analog-digital conversion circuit, can not be upgraded to the digital interface and other issues. And, in order to avoid the appearance of flickering pixels, must be the clock frequency, the vector is fully consistent with the analog signal. In addition, the LCD has not yet formed a unified standard digital interface, the display card with digital output in the market are rare. As a result, the key advantage of LCD is difficult to give full play. This problem may not be well understood, our examples explain it. Used LCD knows that LCD is easy to generate image smearing. LCD response time is a special indicator. LCD monitor response time refers to the input signal of each pixel response speed, response time is short, it shows no motion picture images on the trailing phenomenon. This is playing games, watching fast action images is very important. Response time fast enough to ensure the continuity of the screen. Currently, the market in general liquid crystal display, response time than before has been a big breakthrough, usually around 40ms. But with the increasing development of technology, this gap between LCD and CRT is gradually being offset, and a liquid crystal display response time has been reduced to 5ms. From the appearance, the appearance of lightweight ultra-thin liquid crystal display, the display relative to the traditional spherical than its thickness, size is only half of CRT monitors (such as the Asus MS products, and its thickness is reached surprising 1.65cm), greatly reducing the floor space. Hong Kong and Tokyo is the world's regions with the highest penetration rate of LCD monitors, LCD monitors Hong Kong last year to monitor shipments accounted for 70% of total shipments. We look at areas of high penetration of LCD monitors is not difficult to find, most of these places are more prosperous, more crowded, the standard of living is relatively high, and the office, where the financial skyscrapers. In these places can be described as cost of land. Display space savings is much higher than the price of land and CRT monitors LCD difference. Mainland China is now the downtown areas of some cities also have a trend towards this direction. This question was asked the purpose of your monitor. As we all know, the liquid crystal molecules can own light, so the need to rely on external LCD auxiliary light source. In general, 140 lumens per square meter is enough. Some manufacturers of standard and actual standard parameters there is a gap. Here to explain is the small size of the LCD display is mainly used in notebook computers in the past, using two light adjustment, brightness and contrast so they are not very good. But now the mainstream desktop version of the general brightness of the LCD can achieve 250 lumens to 400 lumens, has begun to move closer to the level of a CRT. For most people, if the CRT and LCD display together, you can more easily distinguish between LCD and CRT monitors general brightness and contrast and color saturation difference, but for general use, this a little bit of difference does not affect your work. But for professional art work and other requirements for accurate color LCD display can not fully meet the requirements of their work. Classification is an LCD display using liquid crystal as a material. LCD is between the solid and liquid between
widescreen LCD monitor
organic compounds. It will become transparent liquid heating, cooling will become cloudy crystalline solid. In the electric field, liquid crystal molecules arranged in the change will occur, thus affecting the light through its changes, the light changes through the role of polarizers can be expressed as changes in light and shade. Thus, it is ultimately controlled by the electric field control of light and shade variation, so as to achieve the purpose of displaying images. According to the arrangement of liquid crystal molecule mode, the LCD display is divided into common: narrow viewing angle of TN-LCD, STN-LCD, DSTN-LCD; wide viewing angle of the IPS, VA, FFS, etc. Which TN-LCD, STN-LCD and DSTN-LCD three display the same principle, but the twist angle of liquid crystal molecules is different. TN: Twisted Nematic (Twisted Nematic) liquid crystal molecules twist angle of 90 degrees. STN: Super Twisted Nematic (Super TN) meaning of S is Super, which is to increase the twist angle of liquid crystal molecules, was 180 degrees or 270 degrees, so the display to achieve superior results (due to increased contrast) . DSTN: Double Super Twisted Nematic (Double layer STN). D is the double layer of its double meaning, so inferior to some more excellent STN. As DSTN display panel structure has been complicated than TN and STN display quality than the more delicate. Wide viewing angle mode, such as the IPS plane change (In-Plane Switching), VA vertical orientation (Vertical Alignment) 1. TN-type is the most mainstream of the market mode liquid crystal display is widely used in entry-level and mid-panel. Currently common in the performance indicators is not a natural viewing angle, color ills. TN panel on the market that are modified in TN + film, film that compensation film for viewing angle to make up for the lack of TN panels, TN panels than to say where the first two panels, is because of his output Gray series are more liquid crystal molecules tilt speed, resulting in easy to improve its response time, currently on the market the following 8ms LCD products are used a TN panel. TN panels are generally very obvious advantages and disadvantages of products, cheap, response time to meet the requirements of the game it's advantages, not the ideal viewing angle and true color performance is a distinct disadvantage. 2. STN and TN type display principle is similar. The difference is, TN twist nematic field effect of liquid crystal molecules are rotated 90 degrees to the incident light, and STN super twist nematic field effect is the incident light 180 to 270 degrees. 3.DSTN by double scanning to scan twisted nematic liquid crystal display, so as to achieve complete display purposes. DSTN is a super-twisted nematic display (STN) evolved. As DSTN Dual Scan technology, STN display relatively speaking, has greatly improved. 4 wide viewing angle mode, used for LCD TV. The IPS, for example, it is the Hitachi panel technology released in 2001, it is also known as From a technical point of view, the traditional LCD display liquid crystal molecules are generally in the vertical - to switch between parallel state, MVA and PVA to the improvement of the vertical - two-way tilt switch mode, and IPS technology with the technology, the biggest difference is that, regardless of What state has liquid crystal molecules are parallel to the screen, only in the power / normal direction of rotation of the molecular state is different - note, MVA, PVA liquid crystal molecules are rotated space rotation (Z axis), while the IPS liquid crystal molecules belongs to the plane of rotation of the rotation (XY axis). To cope with this structure, IPS requires improved electrode, the electrode did ipsilateral to form a flat field. This design brings the problem is twofold, one viewing angle problem has been resolved, partly because the marginal effect of the electric field cause the LCD light efficiency is low (light transmittance), so IPS have the disadvantage of slow response time. 16.7M colors, 178 degree viewing angle and 16ms response time LCD monitor on behalf of IPS is now the highest level. The drive from the LCD panel to points, the most common is TFT (Thin Film Transistor) type drive. It is through the active switch means to achieve precise control of each pixel independently, so the passive compared to the previous driver (commonly known as pseudo-color) can achieve a more sophisticated display. Therefore, most current LCD monitors, LCD TVs and some mobile phones are used TFT driver. LCD multi-mode with a narrow viewing angle of TN LCD TV with wide viewing angle of the IPS and other multi-mode. They are known as TFT-LCD. The composition of major TFT-LCD by a fluorescent tube (or LED Light Bar), light guide plate, polarizer, filter plate, the glass substrate, with the film, liquid crystal materials, thin-mode transistors, and so constitute. First, you must first use of liquid crystal display backlight light source projected that these sources will first pass through a polarizer and then through the liquid crystal. Then the arrangement of liquid crystal molecules will change in the transmission of light through liquid crystal polarization angle, then the light must also pass in front of the color filter film and the other a polarizer. So long as we change the voltage on the added value of the LCD can control the last occurrence of the light intensity and color, so you can change out the LCD panel on the different shades of color combination. Resolution and display size LCD monitors are widely used in industrial control, especially some of the human machine, equipment, complex control panels, medical equipment display and so on. I often used in industrial control and instrumentation in the LCD monitor's resolution is: 320x240, 640x480, 800x600, 1024x768 and above resolution of the screen, commonly used size 3.9 5.5 YIS, etc. Colors are black and white, pseudo-color, 512 color, 16-bit color, 24-bit color and so on.Lenovo L1940p 19 英寸, 1440 × 900 resolution display (6) Some users are often confused with the resolution and dot pitch, in fact, these are two entirely different concepts. Pixel resolution is usually horizontal and vertical pixels to represent the product, the more the number of pixels, the higher the resolution. Therefore, the resolution is usually measured in number of pixels, such as: 640 × 480 resolution, the pixel number is 307200. Note: 640 is the number of horizontal pixels and 480 vertical pixel number. As in a graphical environment, high-resolution images can effectively shrink the screen, so the screen size remains unchanged, its resolution can not cross its maximum reasonable limits, otherwise, would be meaningless. CRT monitors CRT size refers to the diagonal size. Maximum viewing area is the display can display graphics to the maximum extent. Tube the size of the diagonal length is usually measured in units of inches (1 inch = 2.54cm), the common 15-inch, 17 inch, 19-inch, 20 inch. Display area will be smaller than the size of the display tube. Display area with the length and height of the product to that, people usually have to use the visible part of the screen to indicate the length of the diagonal. 15-inch monitor's viewing area 13.8 inches, 17-inch viewable area mostly in the 15 to 16 inches, 19-inch viewable area of 18 inches inches. LCD display size is a diagonal size LCD panel, units in inches (1 inch = 2.54cm), now the mainstream 15-inch, 17 inch, 19-inch, 21.5-inch, 22.1-inch, 23 inch, 24 inch . Display size 14 inches maximum resolution 1024 × 768 15 英寸 1280 × 1024 17 英寸 1600 × 1280 21 英寸 1600 × 1280 24 英寸 1920 × 1080 (Full HD) LCD principles of the physical properties of liquid crystal is such an organic compound, at room temperature the next, showing both the fluid flow, there are crystals of optical anisotropy, which is called along with a variety of optical properties of liquid crystal changes its molecular arrangement of liquid crystal anisotropy vulnerable to such external electric field, magnetic field control is the use of the physical basis of this LCD, the LCD's an optical signal to be modulated, which made liquid crystal display devices in different current electric field, liquid crystal molecules are arranged rotated 90 degrees to do the rules, resulting in differences in light transmission, so the power ON / OFF light and shade of difference arising under, in accordance with This principle control each pixel, can constitute the desired image. physical properties of liquid crystal is: When power turns on, arranged in an orderly change, so easy to pass the light; confusion-energized arrangement to prevent the light through. LCD as a camel to the gate or barrier to light penetration. Technically it simply, the LCD panel contains two very fine sodium-free glass material, known as Substrates, sandwiched a layer of liquid crystal. When the beam passes through this layer of liquid crystal, the liquid crystal itself will stand in rows, or reverse the irregular shape, which block or so that the beam passed. Most LCD are all organic compounds, by a long rod-like molecules. In the natural state, these long axis roughly parallel to the rod-like molecules. The LCD into a slotted plane by sophisticated processing, liquid crystal molecules are arranged along the groove, so if those slots are parallel, then the molecule is completely parallel. The principle of monochrome liquid crystal display LCD LCD technology is poured into the thin slot with two columns between the plane. The two slots on the plane perpendicular to each other (intersection of 90 degrees). In other words, if a north-south plane molecular arrangement, the other east-west plane molecular arrangement, which is located between two planar molecules are forced into a 90-degree turn of the state. As the molecules are arranged along the direction of light propagation, so when the light is reversed through the LCD 90 degrees. When a voltage on the LCD, the liquid crystal molecules will rotate, change the light transmittance, in order to achieve multi-grayscale display. LCD is dependent on the polarization filter (sheet) and the light itself. Natural light in all directions is random divergence. Polarization filter is actually a series of increasingly fine parallel lines. These lines form a network, these lines are not parallel to block all light. The polarization filter coincided with the first vertical line, they are able to completely block the light that has been polarized. Only two completely parallel to the line filter, or turn to the light itself and the second polarization filter to match the light was able to penetrate. LCD is the way two mutually perpendicular polarization filter composition, so under normal circumstances should block all attempts to penetrate the light. However, because between the two filter filled with twisted liquid crystal, so light piercing the first filter, it will be liquid crystal molecules turn 90 degrees, and finally the second filter from the piercing. From the liquid crystal display structure, whether laptop or desktop system, using the LCD display are from different parts of the hierarchy. LCD consists of two glass composition, thickness specifications 0.7mm, 0.63mm, 0.5mm (can be thinned by physical or chemical means to achieve thinner),[url=http://www.moncler-online.us/][b]title=Moncler Sale[/b][/url], during which the liquid crystal containing (LC) 3 ~ 5μm uniform material interval separated. Because the liquid crystal material itself is not light, so they need extra light to the display configuration, the LCD screen on the back of a light guide plate (or even light board) and the reflective film, the main role of the light guide plate is transformed into linear light source or light source display plane perpendicular to the surface light source. The light emitted by the backlight passes through the first polarizing filter layer after layer into the liquid crystal layer. Crystal droplets in the liquid crystal layer are included in the small cell structure, one or more cells constitute a pixel on the screen. Between the glass and liquid crystal material is a transparent electrode, the electrode is divided into rows and columns, row and column intersection, by changing the voltage to change the optical state of liquid crystal, liquid crystal material acts like a small light the valve. In the liquid crystal material surrounding the control circuit and driver circuit portion. When the LCD field generated in the electrode, the liquid crystal molecules will produce distortion, which will be there through one of the rules of the refraction of light, and then through the second filter layer of the filter layer on the screen is displayed. Color LCD display works for a laptop or desktop LCD displays require the use of more complex color monitor, but also to deal specifically with color display with color filter layer. Typically, the color LCD panel, each pixel is constituted by the three liquid crystal cells, each cell in front of all were the red, green, or blue filter. Thus, by the light of different cells can be displayed on the screen in different colors. LCD overcome the bulky CRT, power and flicker shortcomings, but they also bring the cost is too high, not wide viewing angle and color display is not ideal and so on. Choose a resolution CRT display, and can be adjusted according to requirements of the screen, but the LCD screen contains only a fixed number of liquid crystal cell, only in full-screen display with a resolution (each unit is a pixel).
LCD circuit
CRT usually has three electron guns, injection of electron flow must be accurately gathered, or will not get a clear image display. However, there is no focus on LCD problem, because each liquid crystal cell is a separate switch. This is also a picture on the LCD screen on the reasons why it is so clear. LCD refresh rate and do not have to care about flash, the liquid crystal cell either open or closed, so in the low 40 ~ 60Hz refresh rate that is displayed under the image will not display the image than the 75Hz flicker more. However, LCD screen LCD unit will be very prone to defects. Of 1024 × 768 screen, each pixel is composed of three unit structure, are responsible for the red, green, and blue shows a so a total of about 2.4 million units (1024 × 768 × 3 = 2359296). Difficult to ensure that all of these elements are intact. Most likely, some of which have been short (a So, not so high and will not display the product defects. LCD display includes CRT technology has not been used in a number of things. The screen providing light is coiled behind the fluorescent tubes. Sometimes, you will find a certain part of the screen abnormal bright lines. May also be some indecent stripes, a special light or dark an image will affect the adjacent display area. In addition, some quite sophisticated patterns (such as images by dithering) may appear on the LCD screen unsightly ripples or interference pattern. Now, almost all used in notebook or desktop system uses thin-film transistor LCD (TFT) liquid crystal layer in the active cell. TFT LCD technology to display a clearer, brighter images. Early LCD as a non-self-luminous device, the speed is low, efficiency is poor, the contrast is small, even though it can display clear text, but often quickly display images will cast a shadow affect the video display, therefore, now need only be applied black and white display of the handheld computer, pager or mobile phone. As technology advances, LCD technology is constantly evolving and progress. At present the major LCD monitor manufacturers have increased their R & D expenses for the LCD, the LCD technology to break through the bottleneck to further speed up the industrialization process of the LCD monitor, reduce production costs, the user can accept the price level. The LED display is also part of a liquid crystal display, LED LCD technology is an advanced liquid crystal solution, it uses LED instead of a conventional LCD backlight. High brightness, and can be achieved within the life of a stable brightness and color performance. Wider color gamut (NTSC and EBU color gamut over), to achieve a more beautiful color. LED power control is easy to achieve, unlike CCFL brightness there is a minimum threshold. Therefore, whether outdoors or in bright black room, the user can easily adjust the brightness of the display device to the most pleasing to the eye of the state. In order to CCLF as cold cathode fluorescent lamp backlight in the LCD, which can not be missing a key element is mercury, which is the familiar mercury, and this element is undoubtedly harmful. Therefore, many LCD panel manufacturers in the production of mercury-free panel put a lot of energy, well-known IT companies such as Taiwan does not use mercury ASUS LED backlight technology will be passed ROHS certification, so that MS products energy than conventional CCFL displays more than 40%, non-toxic mercury-free technology is not only healthy but also to make it more environmentally friendly than other products, energy saving. Because the use of solid-state light-emitting device, LED backlight is not squeamish components, ability to adapt to the environment is very strong, so wide temperature range of LED, low voltage, resistance to impact. And the LED light source does not produce any radiation, low electromagnetic radiation, mercury can be described as green light. Conclude, the advantages of LED LCD: LED LCD TV with power, environmental protection, the color is more true advantage. Application of new technology and liquid crystal display (1) TFT-Active Element used to drive the structure to create higher quality images, with a unique new technology uses a TFT-Active Element to drive. We all know that very complex liquid crystal display screen in addition to the most important part of the outside LCD, we must count directly related to the LCD screen backlight brightness and the color filter is responsible for generating color. In each LCD pixel to install on the Active Element for point to point control, making the display screen and full integration in stark contrast compared to the CRT display, this control mode the display of accuracy, than the previous control is much higher, so the image appears on the CRT screen at the poor quality, color bleeding, and the phenomenon of jitter is very powerful, but added a new LCD display technology, the picture quality when viewing is quite enjoyable . (2) the use of color filter manufacturing process to create colorful images in the color filter forming the body has not been made before, on the first form the body of material to be dyed, then add the filling membrane manufacturing. This process requires a very high manufacturing standards. But other than ordinary LCD display, with this type of manufacturing out of the LCD, in terms of resolution, color characteristics, or the life of the run, have a very excellent performance. So that the LCD can create the environment in high-resolution color Banlan screen. (3) low-reflective LCD technology is well known that the outside light on the LCD screen has a very large disturbance, some of the LCD display, relatively strong in the outside light when the surface of the glass because it is the reflection, and interference to its normal display. Therefore, in outdoor public places, a number of bright and impressive use of its performance will be greatly reduced. At present, many LCD monitors even if the resolution higher, did not deal with the reflection technique, which for practical work in the application are not practical. Some pure data alone, in fact, there is a bias to guide the user's behavior. The new LCD display on the use of gloss, liquid crystal display screen itself, transmittance, liquid crystal display screen resolution,[url=http://www.uggclearanceuks.com/][b]title=UGG UK[/b][/url], to prevent the reflection of these four aspects, but to a better improvement. (4) advanced . In order to improve pixel response speed, the new technology of the LCD using the most advanced Si TFT liquid crystal display mode with the LCD screen than the old 600 times faster pixel response rate, the effect is really quite different. Advanced to reduce the delay phenomenon screen appears. Now, the low-temperature polysilicon technology, reflective liquid crystal materials research has entered the application phase, the LCD will also develop into a new era. The continuous development of the LCD, while the other flat-panel displays are progressive, the plasma display panel (PDP), electroluminescent array display (FED) and the light-emitting polymer displays (LEP) technology will be launched in the future a new flat panel display the wave. Among them, the most noteworthy and promising is the field-display, it has a lot better than the performance of LCD displays ... but it can be concluded, LCD display technology into a new era, as another branch of the force display products, they may replace CRT monitors . Note the LCD screen using the LCD is very fragile, so to avoid a strong shock and vibration, LCD glass and contains a lot of sensitive electrical components, falling to the floor or other similar strong blow will cause the LCD screen as well as some other units damage. Also careful not to put pressure on the LCD display surface. There is a rule is: do not you remove LCD. Closed for a long time even after the components of the CFL backlight inverter is still possible with a high voltage of about 1000V, this pressure can lead to serious personal injury. So do not you ever attempt to remove LCD screen, so as not to encounter high pressure. Unauthorized repairs and changes will result in temporary or even permanent display does not work. So it is in your hands when restless, do not move delicate and dangerous LCD! LCD is generally required for the air humidity was maintained at 30% to 80%, and the monitor can work, but once the indoor humidity above 80%, the monitor will produce internal condensation. Its internal power supply transformers and other coils are easy to produce leakage after wet, or even short-circuit may cause the connection. Therefore, LCD monitors must pay attention to moisture, long time no display, power can work for some time on a regular basis, so that the heat generated when the monitor will work inside the moisture driven out. If you find the display surface stains, can be a soft cloth moistened with a little water, gently wipe, do not sprinkle water directly to the display surface, the water into the LCD screen will lead to short-circuit. Now there are special LCD cleaner can be purchased. Q & ALCD LCD pixel CRT is burned because of the long-term work to burn, the LCD also have this problem. So be sure to pay attention, if not, be sure to turn off the monitor, or reduce the display brightness of the display. Else a long time, can lead to burn or internal aging. Once this damage occurs is permanent, irreversible. In addition, if a fixed time to display the contents of a row, it may lead to overheating of some LCD pixels, and cause internal burns. Widescreen LCD monitor in the end, however small pixel font and font size of the corresponding, smaller pixels, the text will be smaller. Widescreen panel with a resolution of the general size of the S & P than the screen panel is much higher, so the font is much smaller widescreen, the vision is not good. Widescreen how small the font in the end it? Pixel height (with font size proportional to): 22 'widescreen 0.282mm (1680 * 1050) 21.5' widescreen 0.248mm (1920 * 1080) 19 'widescreen 0.285mm 15' Standard screen 0.298mm 15.4 '(wide) 0.259mm 14.1' Standard screen 0.280mm 14.1 '(wide) 0.237mm 13' (wide) 0.219mm 12 'Standard screen 0.238mm 12' (W) is not to say, that the unusual small font ... ... the use of a liquid crystal display. Avoid the previously mentioned screen burn long internal open the LCD display will reduce its life. So to avoid such situations from occurring, when not in use can take the following measures: 1) when not in use turn off the display; 2) often change at different time intervals on the display screen; 3) will display brightness is reduced to a dark level; 2. Maintain the humidity of the environment has not let any moisture into the nature of things LCD, if the moisture has entered the LCD, the LCD must be placed on a more warm, dry place, so that one of the water and organic compounds evaporate, and then open power. Humidity on the LCD with power, can lead to liquid crystal electrode corrosion, and cause permanent damage. 3. Avoid unnecessary vibration LCD can be regarded as the most sensitive electrical equipment, LCD glass and contains a lot of sensitive electrical components, so that the screen is very fragile, to avoid strong shock and vibration, strong impact can easily cause the LCD damage the screen and the CFL unit. Be careful not to put pressure on the surface of the LCD display, pointing at the screen before the bad habits must be corrected. 4. Do not attempt to disassemble LCD has a rule is, do not you ever remove LCD. Closed for a long time even after the components of the CFL backlight inverter is still possible with a high voltage of about 1000V, this pressure can lead to serious personal injury. So do not you ever attempt to remove or change the LCD screen, so as not to encounter high pressure. Unauthorized repairs and changes will result in temporary or even permanent display does not work. Failure to get any recommendations or professional service station for repairs. Maintenance and repair common sense to avoid the water Do not let any thing with the water into the liquid crystal display. Of course, once this happens do not panic, if found in the boot just before the fog screen surface, wipe gently with a soft cloth on it, if water has entered the liquid crystal display, then the LCD monitor in the warmer place, such as table lamps, will gradually evaporate the water inside, in case of screen components, will lead to liquid crystal electrode corrosion, causing permanent damage. In addition, we should try to avoid the usually humid environments use the LCD monitor. Avoid prolonged work LCD pixel LCD is composed of many, over a long period of continuous use, will make crystal aging or burn, damage occurs, that is permanent, irreparable. In general, do not make the LCD monitor is turned on for a long time (more than 72 hours continuous), if not in time, turn off the monitor, or just let it show white screen content. Avoid In the use of cleaning agents should be careful not to spray cleaner directly to the screen, it may cause short circuit flow in the screen, the correct approach is to glue with a soft cloth and gently wipe the screen clean agent, keep in mind, LCD anti-Do not attempt to disassemble LCD monitors with LCD monitors and other electronic products, the internal LCD will produce high voltage. Dismantle the LCD monitor not only have a certain risk, but also easy to fail to increase the LCD display. Also, the market such as Asus, LG, AOC, DELL and other well-known manufacturers warranty period most of the display for three years, dismantle the LCD monitor display will affect the manufacturers of the reasons for the assessment of damage, and even offer services not part of the warranty, not worth the candle, In order to avoid consumer harm their own interests, do not disassemble the LCD display. Do not use a screen saver when using a desktop computer, many people prefer to use a screen saver, when they switched to using a laptop computer, the good habits are retained, but they do not know the screen saver on the LCD monitor not only no benefit, but also some negative impact. The core structure similar to the liquid crystal display a Signal voltage directly controls the switching state of thin-film transistor, liquid crystal molecules and then use the control transistor, liquid crystal molecules with a clear optical anisotropy can be modulated light emitted from the backlight lamp, to achieve the image appears. And a full display by the number of pixels, each of pixels like a transistor can switch. An image is displayed the LCD, the liquid crystal molecules has been working in the state of the switch, for a 20ms response time to the work of a second LCD, liquid crystal molecules has been switching around a few hundred times. The switching frequency of the liquid crystal molecules are naturally limited life span, LCD will appear to the life of aging phenomena, such as dead pixels, and so on. So when we stop the operation of the computer screen Shihai so colorful repeated movement of the screen saver is no doubt that in the liquid crystal molecules is still repeated on and off. Therefore, over time, you may leave your laptop, especially when using battery power, turn off your LCD is the only correct way. Of course how close it you have a variety of methods. The most direct way is to turn off your laptop, which is the most energy efficient way, of course, you may just leave like 10-15 minutes, restart may feel very impatient, then you can fasten the screen, which The system will automatically turn off the screen when entering standby state, the state back to work again so that the needs of laptop screen can be set off. Clean up the dust on the LCD screen surface of the liquid crystal display than ordinary CRT much more fragile, the best choice for a special brush and special screen cleaning cloth. This screen wipe cloth with good water absorption and good suction power, dust will be easily absorbed into the cloth, and wipe again and again will not stick to the screen again, dust particles will not scratch the LCD screen. Clean up the dust on the LCD display can be used cleaning agents, since most people do not want to buy a special cleaning agent, we have a magic weapon: a soft cloth + water. Here we must note that a soft cloth before wiping must wring, do not let too much water vapor into the LCD display inside, finished with the mop handle after a simple proof can, in addition to general cleaning agents should not use alcohol and other organic solvents, They will corrode the display surface. Shopping tips to see the LCD panel, color and viewing angle out of the trap in the purchase of LCD monitors, consumers tend to monitor the response time of the first place. LCD panel for the understanding, we all know 6BIT (16.2M) and 8BIT (16.7M) two different panels, the two panels we often see. Some brands of display manufacturers boast their often large 16.7M true color panels used to attract the user's attention, raise the product's selling point. The so-called 6BIT (16.2M) of the TN panel used in the color range, up to the maximum number of bits of hair color, 262144 (R / G / B of 64 colors), which means that each channel can only display 64 (2 of 6 square = 64) level gray scale, then we call 6bit panel, which is pseudo-true color panel, the current low-end models of LCD panels used in basic as TN panel. The so-called 8BIT (16.7M) of the color range used in the VA (MVA or PVA) and a variety of IPS panel, was able to achieve 24BIT Seji 16.77 million colors (R / G / B of 256 colors), which means that each color channel can display 256 (2 to the 8th power = 256) gray scale, we call for the 8bit panel, which is the true color panel. TN panel for 16.2M, through technical means jitter is also able to achieve 16.7 color, of course, false color, and where everyone in the purchase, be sure to pay attention to see the panel type, brand manufacturers of the products are generally Note that the panel model and color. Now some of the other first-tier manufacturers have upgraded to the TN panel TN2, and through a variety of color enhancement technology, such as Samsung and LG's complex real mirror chip technology, so the performance is close to 16.2M 16.7M color panel, color panel, but still can be seen by comparing the number of differences, because the physical 6bit panel can display 262144 colors 8bit panel is less than 2% of 16.77 million colors, even if the use of recycled high technology and panel can not be compared with 16.7M . In the viewing angle, the use of VA panel 16.7M can easily monitor the implementation of the basic horizontal / vertical viewing angles are 178 degrees, while the use of TN panels 16.2M LCD products, regardless of how strong its technical advantages, the real viewing angle of 140 degrees will never be comparable with 16.7M color panel. Now use TN panel products at reasonable prices, in actual use, we can not truly experience the 16.2M color panel with 16.7M color panel of the actual differences, and 16.2M has entered the human eye can distinguish the color range, So buy 16.2-color TN panels used will continue to be our best procurement object. For professional graphics users, even 16.7M color display can not be compared with CRT in the same, so cheap, professional CRT monitor is still your best choice. Depth profile response time, how fast for you to buy liquid crystal display element of the first considerations should be the response time, the so-called pixel response time refers to the time change again. Take the LCD with 8ms response time in terms of scope Huang, also refers to a pixel conversion time is 8ms, you can switch within one second of screen values for 1000 / 8 = 125, this value is much larger than humans can perceive the highest recognition rate of 60fps, so the 8ms LCD is the ultimate game plan. ISO (ISO13406-2) on the response time requirement is: When a pixel from white to black power, the electrode voltage from 0 to the maximum, ie, the maximum voltage excitation state, the liquid crystal molecules are rapidly converted to the new location, the The time used in the process known as the rise time. When a pixel from black to white, pixel off the applied voltage, liquid crystal molecules rapidly back to power forward position, a process known as the fall time. The response time course is the rise time plus fall time from the values obtained. But, in fact, this provision only when considered with extreme black black and white pixels shortest switching time, when in actual use to measure up to the gray scale value switch without much guidance. Pixel defines only the response to the rise or fall during the entire pixel to 80% of the time, according to the ISO definition of the so-called white referring to 10% gray, black refers to the 90% gray, the remaining 20% of the time were ignored. ISO definition of mind so difficult to understand because for the liquid crystal molecules, the stability of power-up and the last two stages are time-consuming, two gray-scale conversion of 20% of the process is likely to exceed their share of ISO response time defines the time that if eliminating the 20% target can be greatly beautified, but this is clearly unfair for consumers. Of course, ISO-defined defect also more than that, the most serious is the neglect of the color change - that is, different gray switching time, which is most of our daily use of the display is the display of status. From the principle of liquid crystal display, when a lighter gray pixel shift from the deep gray, its added to the pixel electrode voltage response strengthened at both ends. However, the definition and ISO specifications the maximum black and white black switch excitation voltage compared to the corresponding gray-scale voltage is applied when the switch is much lower, so in this case, the liquid crystal molecules reverse speed will be slow to respond. Similarly, when the gradation from dark gray to light gray-order transition, the process is reversed, but now light gray corresponding electrode voltage is not zero, the voltage difference between the corresponding incentive effect will be worse, falling time becomes longer. It is also because the ISO standard and is not forcing manufacturers to provide the user response time parameters in the time to consider the intermediate gray response time, so the manufacturers marked their operational space much larger. Therefore, we must be clear: in the end this response time is talking, it is true But not as long as the claim that the gray response time, then rest assured that buying better. This technique works on the talk from the gray scale. Response time is the essence of the reverse speed of liquid crystal molecules, to make liquid crystal molecules move faster, generally have the following three ways: 1, increase the drive voltage law: the rotational speed of liquid crystal molecules and the relationship between voltage, the higher the voltage, the molecular rotation faster. 2, the liquid crystal molecules to change the initial state method: This method is actually to the liquid crystal molecules in a precarious state, if there is However, the implementation of this approach can not be unlimited, liquid crystal molecules can be too unstable, otherwise it will not be effectively controlled. 3, reducing the viscosity of liquid crystal method: LCD more viscous, driving up the more laborious, and were suspicious that missing is a reason. If you look at the LCD dilution, driven relatively easy, the natural response time can be improved. However, after dilution will affect the control of liquid crystal light, response times were improved, the cost is great: the lower the viscosity, the more dark color screen, the image details but also become blurred, and it will produce a slight light leakage phenomenon. This is only in its original LG S-IPS panel on the use of grayscale technology is one important reason. View of the considerable shortcomings of both methods 2 and 3 (some 12ms product while using the two methods 1 and 3, resulting in poor display, so the new LCD panel has been much in the hands and feet), so the current gray-scale response time reduction depends on the pressure, with panel manufacturers (such as AUO) is expressed as the Over Drive technology. Over Drive technology, used mainly for liquid crystal relative rise time provides a voltage overshoot (overshoot voltage), and this moment of the overshoot voltage is actually experienced a rise and a final descent down to the target voltage (here A general principle is: the rise time is significantly greater than the fall time, thus shortening the time the original process can be increased by providing a higher voltage with a short rise time fall time to achieve), you can see over- shoot has been an up / down conversion, coupled with an LCD image display itself up / down conversion, superposition effect will be significantly enlarged, 6bit panel display itself on the principle of need through the Instead, the LCD will have a better static performance, which fully shows that pressure is not a panacea, not to mention increasing the liquid crystal cell box LCD drive voltage will also reduce the life of it? We learned from the AU, in fact, we see TN 16ms, 12ms and 8ms panel displays are the same, the reason for the existence of differences in response time, because the rear of the drive circuit and whether the application of Overdrive technology, in fact, In our practice, all of the liquid crystal display brightness and contrast in terms we can meet all the needs, but a closer analysis, the bright and the contrast of the LCD display is actually a very good performance of the merits of the expression. We need is more and more pure white light black. We can see from the definition of the indicator, if manufacturers want to improve the index, then no doubt there are two ways to improve or increase the purity of white light black, the former is clearly the pursuit of each manufacturer (impure because the LCD black is a common problem), while the latter easier to achieve. The brightness index is actually too high and not necessarily to please, LCD has been much higher than the CRT, there are many LCD at the lowest brightness is still the details. In addition, dead pixels and also has been troubled by the user highlights an important aspect of purchasing, bought a lot of users found dead pixel LCD display, return to replace it when the business is deny it, or are we the last unlucky consumers. There are a lot of branded monitors offer no guarantee of highlights, so we try to choose the choice of product brands, each brand has different quality, in contrast to the time of purchase carefully, cut errors Jizao, otherwise more harm than good . Technical Parameters 1. LCD viewing area marked on the actual size is consistent with the scope screen can be used. For example, a 15.1 inches LCD display approximately equal to 17-inch CRT screen visibility. There are many manufacturers use the so-called FRC (Frame Rate Control) technology to simulate the way to show full-color images, that is, each basic color (R, G, B) to achieve 8-bit, or 256 degrees kinds of performance , then there is up to each individual pixel 256 × 256 × 256 = 16777216 colors up. 4 Contrast (Contrast ratio) is defined on the ratio of the maximum brightness value (all white) divided by the minimum brightness value (black) ratio. Relatively easy to achieve CRT monitor's contrast ratio of 500:1 or more terms. However, because the contrast is difficult to measure accurately by the instrument, so pick a time or to personally go to the job. 5 the maximum brightness of the LCD brightness, usually by the cold cathode ray tube (light source) to determine the luminance values are generally between the 200 ~ 250 cd/m2. Six tube design actually uses three tubes, three lamp manufacturers are bent This value is of course the smaller the better. Clear that we have to say from the human eye's perception about the dynamic image. Cartoons, movies, and even today the latest game is the residual principle applied to the visual, so that a gradient of the image displayed in rapid succession before the eyes, they form a dynamic image. Thus, for liquid crystal display, the response time of 40ms has become a hurdle, more than 40ms will display noticeable flickering, feel vertigo. If you want the image screen to the extent not flash, then it is best to reach the speed of 60 frames per second. With a very simple formula to calculate the corresponding reaction time under the number of frames per second as follows: response time 30ms = 1/0.030 = about shows 33 frames per second, response time of 25ms = 1/0.025 = about shows 40 frames per second, response time 16ms = 1/0.016 = about display 63 images per second, response time of 12ms = 1/0.012 = about display 83 images per second, response time of 8ms = 1/0.008 = about display 125 frames per second, response time of 4ms = 1/0.004 = 250 frames per second, about display screen response time 3ms = 1/0.003 = display 333 images per second, about the response time of 2ms = 1/0.002 = 500 frames per second display screen about the response time of about 1ms = 1/0.001 = second display 1000 screen prompts: the contents of the above response time, we learned the relationship with the picture frames. But we should pay attention to gray response time of sale, full-color response difference between the text, sometimes grayscale and full color 5MS 8MS say is a meaning, and we had to sell on the CRT, we say dot pitch is .28, LG on insisted that he was .21, while ignoring the talk about the level of pitch, in fact, both sides say is a mean person, and now LG has recently come out a sharpness of 1600:1, which is a concept of speculation, we used screen which is basically a few, which will be only a 1600:1 LG, and we have stayed at the 450:1 level? If from a very oblique angle viewing a full white screen, we might see a black or color distortion. That most of the light is shot out from the screen vertically, so from a perspective view of a large LCD display, they can not see the original color, or even only to see all white or all black. TN + FILM The technology is based on the original,[url=http://www.uggbootsclearanceuks.co.uk/][b]title=UGG Clearance[/b][/url], add a layer of wide viewing angle compensation film. This layer compensation film can be increased to 150 degrees viewing angle, is a simple way, in the liquid crystal display in a large number of applications. IPS (IN-PLANE-SWITCHING, in-plane switching) technology, known as vertical and horizontal viewing angle can reach 170 degrees more. In appearance or power consumption than traditional CCFL backlight are not a small advantage, I believe that as technology becomes more mature, LED on the market is bound to achieve great success, the market potential is very great , but for most people chose to monitor the appearance of the primary factor, ultra-thin energy is the future of mainstream fashion. More entries Atlas AtlasLenovo L1940p 19 British ... (6)
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