TFT liquid crystal display common sense

by:Kimeery     2021-08-25
LCD (Liquid Crystal Display) LCD screenuses the latest full-color display technology, and the principle is simple and easy to understand. Basically, the concept of the entire liquid crystal display technology is to use the physical properties of liquid crystals: when it is energized, the arrangement becomes orderly, allowing light to pass through; when it is not energized, the arrangement is chaotic and preventing light from passing through. Let the liquid crystal block or allow light to penetrate like a gate. In terms of technology, the LCD panel contains two very delicate soda-free glass materials, called Substrates, with a layer of liquid crystal in between. When the light beam passes through this layer of liquid crystal, the liquid crystal itself will stand in rows or twist in an irregular shape, thus blocking or allowing the light beam to pass smoothly. Rules LCD follows a series of rules different from CRT display. LCD overcomes the shortcomings of CRT's bulkiness, power consumption, and flicker, but it also brings problems such as high cost, low viewing angle, and unsatisfactory color display. CRT display can choose a series of resolutions, and can be adjusted according to the requirements of the screen, but the LCD screen only contains a fixed number of liquid crystal cells, can only use one resolution display on the full screen (each cell is a pixel). CRT usually has three electron guns, and the emitted electron streams must be accurately concentrated, otherwise a clear image display will not be obtained. But LCD does not have a focus problem, because each liquid crystal cell is individually switched. This is why the same picture is so clear on the LCD screen. LCD does not need to care about the refresh rate and flicker, the liquid crystal cell is either on or off, so the image displayed at a low refresh rate of 40-60Hz will not flicker more than the image displayed at 75Hz. But on the other hand, the liquid crystal cell of the LCD screen is extremely prone to defects. For a 1024x768 screen, each pixel is composed of three units, which are responsible for the display of red, green, and blue, so a total of about 2.4 million units (1024x768x3u003d2359296) are required. It is difficult to guarantee that all these units are intact. Most likely, some of them have been short-circuited (“bright spots” appear), or disconnected (“black spots” appear). Some customers may think that the perfect LCD display should be purchased at such a high price-unfortunately this is not the reality, at best you can pick a screen that is not particularly obvious. The LCD display contains some things that have not been used in crt technology. The light source for the screen is the fluorescent tube coiled behind it. Sometimes, we will find unusually bright lines on a certain part of the screen. There may also be some indecent stripes, a special light or dark image will affect the adjacent display area. In addition, some fairly precise patterns (such as dither processed images) may appear unsightly moire or interference lines on the LCD screen. u003d'' There is another issue of angle of view or'observation angle'. The reason why LCD has a viewing angle problem is that it uses a light transmission mechanism, which adjusts the light passing through the screen. The crt is a light emission system. For crt, the special material (phosphor) behind the screen can actively emit light. In the LCD, although the light can penetrate the correct pixel, the oblique light will also penetrate the adjacent pixels, so you will find that the color is seriously distorted when viewed from outside the normal viewing angle.
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