Detect the color and dead pixels of the computer monitor/phone screen online with a solid background.
Tips: Computer monitor/phone screen can cause significant differences in display performance due to the different LCD panels used in the manufacturing process. The easiest way to measure the quality of a monitor is to use a solid color test. It is easy to find some obvious flaws on the screen in a solid color background, such as bright spots, dark spots, color casts, and uneven illumination.