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How color LCD display works
2011-10-16 by seoer1
For laptop or desktop LCD monitors need to adopt more sophisticated 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).
CRT LCD circuit 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 display  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 "bright spot") or open (a "black spots"). 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. In recent years 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. Now, LCD monitors is almost universal, the price for the average consumer can accept, even such as Samsung, Asus, LG and other manufacturers of high-tech and high-end LCD monitor prices are not "unattainable." The rapid development of LCD technology, many problems has made considerable progress, LCD display has gradually begun to replace the CRT to become the most important daily life display device.
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 graphic LCD module, 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.
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