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LCD is a backlight display device. The light is provided by the backlight behind the LCD module. When the backlight passes through the polarizer, liquid crystal, and orientation layer, the output light has directivity. That means most of the light is coming straight out of the screen. Therefore, when you look at the LCD from a large Angle, you can’t see the original color, some time even just white or black color can be seen. The Angle (left and right, up and down) at which the original color appears on the screen is called the Viewing Angle of TFT LCD display Screens.
There are different visual effects from different view angle when viewed from the middle and side of the LCD display screen, the intensity of light entering the human eye is different. For the same picture, there is light and dark part, and the contrast is different. With the definition of perspective, the corresponding perspective of the LCD screen is perspective within the acceptable contrast range of human eyes.
As long as the horizontal viewing angle reaches 120 degrees and the vertical viewing angle reaches 140 degrees, the LCD on the market can fit the application needs of most users. The latest LCD screens are made with wide-angle technology, which can reach up to about 150 degrees, reducing the inconvenience caused by the small viewing angle.