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Color LCD display works
2011-09-13 by seoer
For laptop or desktop STN display require the use of more complex color monitor, but also 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. In this way, the light through different cells can be displayed on the screen in different colors. LCD overcome the bulky CRT, power and flashing 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 series 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 use a resolution in full-screen display (each unit is a pixel). CRT usually has three electron guns, injection of the electron flow must be accurately gathered, or will not get a clear image display. Focus on the problem but the LCD does not exist, 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 or 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 monitor LCD unit will be prone to defects. Of 1024 × 768 screen, each pixel is composed of three unit structure, are responsible for the red, green and blue display 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 "bright spots") or break (a "black spots"). So, not so high and will not display defects in products. LCD module includes a CRT technology has not been used in a number of things. Provide light for the screen is coiled behind the fluorescent tube. Sometimes, you will find a certain part of the screen abnormal bright lines. May also be some indecent stripes, a special light or dark images will affect the adjacent display area. In addition, some quite sophisticated designs (eg, by dithering the image) may appear on the LCD screen unsightly ripples or interference pattern. Now, almost all of the used laptop or desktop systems use thin-film transistor LCD (TFT) liquid crystal layer in the active cell. TFT LCD technology to display a clearer, brighter image. Early LCD as a non-active light-emitting devices, the speed is low, efficiency is poor, the contrast is small, although able to display clear text, but often quickly display images will cast a shadow affect the video display, therefore, now needs only to be applied black and white display of the handheld computer, pager or mobile phone. With the ever-changing technology, LCD technology has been development and progress. At present the major LCD monitor manufacturers have increased the cost of LCD research and development, LCD technology to break through the bottleneck, and further accelerate 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 (greater than NTSC and EBU color gamut), to achieve a more bright colors. The LED power control is very easy, 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. CCLF cold cathode fluorescent lamp in the backlight of the LCD as in, which can not be missing a key element is mercury, which is the familiar mercury, and this element is undoubtedly harmful. Thus, many LCD panel manufacturers in the production of mercury-free panel put a lot of energy, such as Taiwan's leading IT companies do not use mercury ASUS LED backlight technology will be passed ROHS certification, the MS series of energy-efficient than conventional CCFL displays more than 40%, non-toxic mercury-free technology is not only healthy but also makes it more environmentally friendly than other products, energy saving. Because the use of solid state lighting devices, LED backlight is not squeamish parts, ability to adapt to the environment is very strong, so the LED operating temperature range, low voltage, high 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 energy-saving, environmental protection, the color is more realistic edge.
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