The dead pixels, bright spots, and dark spots of the LCD panel
Jun 01, 2021
The liquid crystal panel is composed of a large number of pixels, and they can display the two colors of black and white and the three primary colors of red, yellow and blue. By combining the pixels that display different colors, we can see the image displayed on the LCD panel. However, the few pixels on the LCD panel cannot produce color changes. No matter what kind of image the LCD screen displays, these pixels always display the same color. These defective pixels cannot be repaired and can only be solved by replacing the entire LCD panel.
These faulty pixels are usually divided into two categories, among which the "dark spots" are the "black spots" that cannot be displayed no matter how the screen display image changes, and the more annoying is the one that always glows as long as it is turned on. The "highlights". Highlights: Three pixels of R, G, and B are presented in the case of a black screen. Dark spots: In the case of a white screen, there are color spots that are not simple R, G, and B pixels.
With the development of liquid crystal display technology up to now, it is still unable to fundamentally overcome this defect. Because the liquid crystal panel is composed of two glass plates, the interlayer in between is crystal droplets with a thickness of about 5 microns. These crystal droplets are evenly separated and contained in small cells, and every three cells constitute a pixel on the screen.
Under the magnifying glass, the pixels are square, and a pixel is a luminous point. Each light-emitting point has an independent transistor to control the strength of its current. If the transistor controlling the point is broken, the light-emitting point will always be on or off. These are the bright or dark spots mentioned earlier, collectively referred to as "bad spots"!
Dead pixels: pure black points in the case of a white screen or pure white points in the case of a black screen. When switching to the red, green, and blue display mode, this point is always at the same position and is always a pure black or pure white point. In this case, it means that the three pixels of R, G, and B have been damaged, so it is called a dead pixel.
