The display principle of LCD display

Views: 205     Author: Reshine     Publish Time: 2023-07-05      Origin: Site

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The display principle of LCD display

The basic principle of liquid crystal display is to sandwich the liquid crystal between two conductive glass substrates. The liquid crystal molecules are distorted and deformed by the action of the electrodes on the upper and lower glass substrates, changing the polarization state of the light beam through the liquid crystal box, allowing switch control of the backlight beam. A color picture display can be achieved by sandwiching a color filter between the two glass substrates.


1. Applying an external electric field to the LCD box

Because the distorted pitch of liquid crystal molecules in the box is much larger than the visible wavelength in TN-type liquid crystal display devices, when the polarization direction of the incident linearly polarized light is the same as the arrangement direction of liquid crystal molecules on the glass surface, its polarization direction will be distorted by 90° due to the distortion of liquid crystal. It is released in a transmissive state from the opposing side. The long axis of the liquid crystal molecules will begin to tilt in the direction of the electric field if a voltage is applied to the liquid crystal box at this time and reaches a certain value. All of the liquid crystal molecules between the two electrodes in the liquid crystal box will also be rearranged in the direction of the electric field, except the liquid crystal molecules on the surface of the electrodes. At this point, both the spin effect between the orthogonal polarizers and the 90° spin function vanish, rendering the device light-insensitive. Click here for 4.0 Ips Tft Lcd Display.


2. The brightness of an LCD liquid crystal display is also affected by the amount of voltage applied

The color shown by each LCD sub-pattern is determined by the color screening procedure. Because the LCD lacks color, the various colors are generated using color filters rather than subpatterns, and the subpatterns can only be adjusted in grayscale by adjusting the intensity of the light passing through them. Only a few active matrix displays use analog signal control, while the vast majority use digital signal control. The majority of digitally controlled LCDs employ an eight-bit controller capable of producing 256 levels of grayscale.


You can acquire 256 colors by using sub-pattern elements, each of which may express 256 levels and 16,777,216 different colors. This 24-bit color scale is not perfect, therefore engineers utilize pulsed voltage control to make color changes appear more uniform. The human eye cannot discern linear changes in brightness, and it is more sensitive to variations in low brightness.


Each pixel in a color LCD is divided into three cells, or subpixels, with extra filters to distinguish red, green, and blue. These three subpixels are separately controllable, and the matching pixels can produce dozens or even millions of colors. Colors were displayed in the same way on older CRTs. As needed, the color components are organized according to different pixel geometries.

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