The working principle of the liquid crystal panel is that the voltage applied to the liquid crystal is controlled by the semiconductor transistor to change the state of the arrangement of the liquid crystal molecules, and light-dark change of each pixel is realized. When the transistor controlling the rotation of the liquid crystal molecules fails, a dead point occurs.
(1) Types of bad spots
Bad point: Pixels that appear pure black or white on any color background because all three cell driver tubes of the corresponding pixel fail.
Highlights: If only one or two drive tubes in the three liquid crystal cells of the corresponding pixel fail, then in the dark background, there will be pixels of one of the colors red, green, and blue; or the original should be red and green. The blue and blue dots are white.
(B), detection of dead pixels
1, using the test disc detection
Manufacturers often show a lot of tantalizingly beautiful pictures when they show them to consumers. On this screen, the average person cannot see the dead pixels. It is recommended that you create a test disc with only five solid colors: black, white, red, green, and blue. After you get the test disc and put it into the DVD player in the mall, choose a black and white or red, green, and blue monochrome background. If there are black, white, and different color luminous spots, then this LCD TV is displayed. There is a bad point. There are also some special test discs, listed below, for reference: "AVIA", "Hivi Cast", "Digital Video Essentials" and so on.
2, using the computer's graphics check
If television is sent to the home first, it can also be detected using the device at home. General use of computers connected to LCD TVs, so that the TV presents a variety of solid-color images. First of all, you need to consider the interface issues, such as the VGA interface is a common computer interface, if you just have a VGA TV interface, then just prepare a VGA cable in advance, select "PC (VGA) signal source input" on the TV, and press Set up your TV in the instructions, and then use the solid color screen in the software such as TFTtest, CheckScreen, DisplayMate to display the desired screen. It is also possible to select the desktop of the corresponding color in the properties of the desktop of the computer to detect it, which is the same as the detection method made when purchasing the liquid crystal display.
If none of the above methods are feasible for you, you can also connect directly to cable TV and use one of the screens in the TV program to detect it through the TV's still image function.
Finally, you need to remind you that: not all LCD TVs have a bad point, and all manufacturers have a description of the number of dead pixels, usually 3, 5 or 8 different, which with the manufacturers of the quality The severity of control is related. Therefore, it is recommended that consumers should agree in advance with the seller on the number of bad spots and related replacement procedures. In addition, after the television is delivered, it must be checked as soon as possible. Do not delay your normal claim rights because time is too long.
More fun content can go to cool to open the community to understand, play TV together!
(1) Types of bad spots
Bad point: Pixels that appear pure black or white on any color background because all three cell driver tubes of the corresponding pixel fail.
Highlights: If only one or two drive tubes in the three liquid crystal cells of the corresponding pixel fail, then in the dark background, there will be pixels of one of the colors red, green, and blue; or the original should be red and green. The blue and blue dots are white.
(B), detection of dead pixels
1, using the test disc detection
Manufacturers often show a lot of tantalizingly beautiful pictures when they show them to consumers. On this screen, the average person cannot see the dead pixels. It is recommended that you create a test disc with only five solid colors: black, white, red, green, and blue. After you get the test disc and put it into the DVD player in the mall, choose a black and white or red, green, and blue monochrome background. If there are black, white, and different color luminous spots, then this LCD TV is displayed. There is a bad point. There are also some special test discs, listed below, for reference: "AVIA", "Hivi Cast", "Digital Video Essentials" and so on.
2, using the computer's graphics check
If television is sent to the home first, it can also be detected using the device at home. General use of computers connected to LCD TVs, so that the TV presents a variety of solid-color images. First of all, you need to consider the interface issues, such as the VGA interface is a common computer interface, if you just have a VGA TV interface, then just prepare a VGA cable in advance, select "PC (VGA) signal source input" on the TV, and press Set up your TV in the instructions, and then use the solid color screen in the software such as TFTtest, CheckScreen, DisplayMate to display the desired screen. It is also possible to select the desktop of the corresponding color in the properties of the desktop of the computer to detect it, which is the same as the detection method made when purchasing the liquid crystal display.
If none of the above methods are feasible for you, you can also connect directly to cable TV and use one of the screens in the TV program to detect it through the TV's still image function.
Finally, you need to remind you that: not all LCD TVs have a bad point, and all manufacturers have a description of the number of dead pixels, usually 3, 5 or 8 different, which with the manufacturers of the quality The severity of control is related. Therefore, it is recommended that consumers should agree in advance with the seller on the number of bad spots and related replacement procedures. In addition, after the television is delivered, it must be checked as soon as possible. Do not delay your normal claim rights because time is too long.
More fun content can go to cool to open the community to understand, play TV together!
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