How to evaluate the advantages and disadvantages of a liquid crystal display
Author:Ke Yulin Time:2021-10-08 12:24 Browse(43)
Advantages: 1. In fact, compared with the traditional CRT, the biggest advantage of LCD is the power consumption and volume. For the traditional CRT, its power consumption is almost 80W, while the power consumption of LCD is about 40W. So, LCD has obvious advantages in energy saving.
Advantages: 1. In fact, compared with traditional CRT, the biggest advantage of LCD is its power consumption and volume. For traditional CRT, its power consumption is almost 80W, while the power consumption of LCD is about 40W. So, LCD has obvious advantages in energy saving.

How to evaluate the advantages and disadvantages of a liquid crystal display



2.
compared with traditional CRT, LCD also shows good performance in environmental protection, The reason is that there is no high-voltage components such as CRT in the LCD, so the X-ray exceeding standard caused by high-voltage will not occur, so the radiation index is generally lower than CRT.


3.
because CRT displays control the electron beam by electromagnetic field generated by deflection coil, and the electron beam can not be absolutely positioned on the screen, Therefore, CRT displays often have different degrees of geometric distortion and linear distortion.
while LCD displays will not have any geometric distortion due to its principle problems.
linear distortion is also a big advantage.


4. LCD displays have large visual area: generally, when CRT displays are developing.
there will be some black edges around the display screen to occupy the visual screen; For example, a 13 inch LCD is equivalent to a 15 inch CRT.


5. High fine image quality.
generally, the resolution of LCD can reach 720 lines, while that of CRT is much lower.

of course, in addition to the above advantages, Liquid crystal also has obvious advantages in light and thinness.


disadvantages: first, the visual deflection angle is too small.
the visual deflection angle of liquid crystal display is limited.
the liquid crystal display has many disadvantagesUsually, you can only view from the front, but from the side, there will be greater brightness and color distortion.
nowadays, the visual deflection angle of liquid crystal display on the market is generally about 140 degrees.
it is enough for personal use, but if several people watch at the same time, The problem of distortion appears.


the second disadvantage is that it is easy to produce image tailing.
fast enough response time can ensure the continuity of the picture.
this is very important when playing games and watching fast-moving images.
at present.
the response time of ordinary LCD on the market has made a great breakthrough compared with before, Generally, it is about 40ms.
but the response time of some LCD products is not short enough.
this leads to the phenomenon of image tailing when displaying moving pictures.


the third disadvantage is that the brightness and contrast of the LCD are not very good.
because the liquid crystal molecules cannot emit light by themselves.
therefore, the brightness and contrast of the LCD are not very good, Generally speaking, 140 lumens per square meter is enough.
there is still a gap between the parameter standards of some manufacturers and the actual standards.


defect four: the "bad spot" problem of liquid crystal.
the material of liquid crystal display is generally glass.
it is easy to break, and every pixel is very small, Individual pixels are often damaged, commonly known as "bad spots", which can not be repaired. Only the whole display screen can be replaced, However, the replacement price is often very expensive.


disadvantage 5: limited service life.
LCD is not as durable as ordinary display.
it is generally believed that two to three years is a normal service life.
therefore, whether you are willing to replace the display again after two or three years should be considered when purchasing.
in this paper, the design of LCD is introduced

Generally speaking,
the advantages of traditional CRT display in color and fast image display are obvious, and the advantages of LCD in appearance, non radiation and non flicker are also outstanding.
each has his own favorite.
what kind of display products to buy depends on your specific needs, and we will provide you with some essential observation of LCD, If you tap the top left corner gently, if there is a slight abnormal tremor on the screen, it means that the y-direction voltage is not normal, and (absolute defective product) lights up the RGB picture, which can effectively detect all kinds of common defects, and then lights up the l0 picture (all black picture), which can detect bright spots, as well as all kinds of mura and Zara, and lights up the L63 picture, This is to check the bright line, and then turn on l255 (all white). This is mainly to detect all kinds of defects of backlight. The above is a simple inspection of AI. It's OK to check with eyes. I'm the factory inspector of AOC monitor. If you don't understand anything, you can directly ask me to judge that the grade is generally divided into four grades. P / S / Q / F P is the best l0 picture with no bright spot, Mura and all kinds of ladder defects, if mild, can go s level, there are 1-3 bright spots, can go Q level (generally Q in the market) f level, no warranty quality can be distinguished from the naked eye, very bad, but the price is low, more than 300 can be solved,
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