How to check liquid crystal display?
First look at the appearance, there is no obvious scratch marks. Connect the power supply after using some test software (such as DisplayX) to test whether there are bright spots, LCD pixels. And observe whether there is leakage of liquid crystal surface edge phenomenon obviously, the screen brightness is uniform.
It is important to see if there are any highlights
Is the most common white or black spots Huaidian monitor screen. Black spot identification method is to change the whole screen into a white screen, the black spot there is no place to hide; white point is the opposite, the screen into a black screen, white spots will show the prototype. Generally no more than 3 pixel display can be considered qualified, but the price difference and not bad. So when the user buy LCD must pay attention to the selection of products not bad. If you do not see what the white spots on the dead, that can only choose quality assured brand.
