1. Hardware problem: It may be a problem with the display itself, such as the failure of LED tubes or driving circuits at the four corners of the screen, which leads to redness or redness.

2. Display setting problem: In the setting of the monitor, an incorrect display mode or color mode may be selected, resulting in red or redness at the four corners of the screen.

3. Monitor driver problem: It may be that the driver of the monitor is not installed or updated correctly, which leads to the incompatibility between the driver and the monitor, and the four corners of the screen are red.

NanoIPS is a new panel launched by LGDisPlay Company of South Korea at the end of 20 17, which is an upgrade and improvement of traditional IPS panel at the hardware level.