Since the light source that provides LCD display displays has a certain directionality when it is output after refraction and reflection, color distortion will occur when viewed beyond this range, and CRT displays will not have this problem.
The viewing angle determines the size of the user’s viewing range and the best viewing angle. If it is too small, the user will slightly deviate from the front of the screen, and the picture will lose color. General users can use a viewing angle of 120 degrees as a selection criterion.
The viewing angles of LCD monitors sold on the market are all left-right symmetrical, but the top and bottom are not necessarily symmetrical, and the vertical angle is often smaller than the left-right angle. When we say that the viewing angle is 80 degrees left and right, it means that the screen image can still be clearly seen when standing at a position of 80 degrees from the screen normal (that is, the imaginary line in the middle of the display). The larger the viewing angle, the better the viewing angle, and the more applicable LCD displays.
Since everyone’s eyesight is different, we take the Contrast as the standard. The greater the Contrast measured at the maximum viewing angle, the better. The viewing angle of most products on the market is above 120 degrees, and some products are above 170 degrees. It should be noted that the nominal value of the viewing angle is different under different measurement methods. Because the display manufacturer usually does not specify the specific measurement method, in general, the viewing angle is a reference value.
Industry measurement methods
The viewing angle of the Liquid Crystal display includes two indicators, the horizontal viewing angle and the vertical viewing angle. The horizontal viewing angle is expressed by the vertical normal of the display (that is, the vertical imaginary line in the middle of the display). The displayed image can still be seen normally at a certain angle on the square or right. This angle range is the horizontal viewing angle of the Liquid Crystal display; also if the horizontal normal is used as the standard, the vertical viewing angle is called the vertical viewing angle . Generally speaking, the viewing angle is based on the contrast change as a reference standard. When the viewing angle is increased, the contrast of the displayed image seen at that position will decrease, and when the angle is increased to a certain extent, and the contrast decreases to 10:1, this angle is the maximum viewing angle of the liquid crystal display.
In the liquid crystal display, many manufacturers’ products have reached the level of 170 degrees horizontal viewing angle and 160 degrees vertical viewing angle.