What is the LCD TV bright spot
Each pixel on the LCD screen has three primary colors of red, green, and blue, which are combined to cause the pixels to produce various colors. Taking a 15-inch liquid crystal display as an example, the liquid crystal panel has an area of ​​304.1 mm × 228.1 mm and a resolution of 1024 × 768. Each liquid crystal pixel is composed of RGB three primary color units. The liquid crystal pixel is a "liquid crystal cell" formed by pouring the liquid crystal into a fixed mold. The number of such a "liquid crystal cell" on a 15-inch liquid crystal display device is 1024 x 768 x 3 = 2.35 million!
The bright/bad point is also known as the bright spot of the liquid crystal display. It is a kind of physical damage of the liquid crystal screen, mainly because the internal reflection plate of the screen in the bright spot is pressed by external force or slightly deformed by heat.
What is the size of a "liquid crystal cell"? We can simply calculate: high = 0.197mm, width = 0.297/3 = 0.099mm! That is to say, in the area of ​​304.1mm × 228.1mm, 2.35 million "liquid crystal cells" with an area of ​​only 0.297 mm × 0.099 mm are arranged densely, and a liquid crystal cell is separately driven behind the liquid crystal cell. Drive tube. Obviously, this production process requires very high production line. With the current technology and process, there is no guarantee that the LCD screen produced by each batch has no bright/bad spots. Manufacturers generally avoid bright/bad spots to divide the LCD panel. The LCD screen with no bright/bad spots or few bright/bad points is supplied to powerful manufacturers at a high price, and those LCD screens with more bright/bad points are generally supplied to small manufacturers to produce inexpensive liquid crystal display devices at low prices.
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