What is the viewing angle of an LCD screen?

 

Viewing angle is a very important indicator for evaluating the performance of liquid crystal display. It refers to the visual range that meets the following two visual requirements. The first is the contrast ratio, which generally requires a contrast ratio of 10:1. The second is grayscale, which requires no grayscale inversion. Combining the above two requirements, the viewing angle is defined as the angle when the contrast ratio is 10:1 within the angle range without grayscale inversion.

 

Since the screen of the liquid crystal display adopts a light transmission mechanism, and the light is emitted forward at a near-vertical angle through the liquid crystal, the best visual effect can be achieved only when the screen is directly in front of the screen. When the viewing angle is changed, the angle at which the light of the display screen enters the human eye will also change, and the display content will be distorted and darkened; when the viewing angle exceeds a certain critical angle, we will not be able to see the screen content, which This is what we call the viewing angle.

 

The viewing angle usually includes two indicators: the horizontal viewing angle and the vertical viewing angle.

 

The horizontal viewing angle means that the vertical normal line of the display screen (that is, the vertical imaginary line in the middle of the display screen) shall prevail, and the display content can still be viewed normally at a certain angle on the left or right side of the normal line. The angle is the horizontal viewing angle of the LCD screen.

 

The vertical viewing angle is based on the horizontal detection of the display screen. The angle range of the upper and lower sides that can normally view the image is the vertical viewing angle of the LCD screen.