The Working Principle Of Lcd Display Is Introduced

lcd displays are now used in many devices in our lives.

In the thickness of less than 1 cm TN-LCD LCD panel, it is usually made of two large glass substrate, sandwiched with color filter, matching film, etc., and then wrapped with two polarizer plates, which can determine the maximum luminous flux and color generation. The color filter is a filter composed of red, green and blue colors, which is regularly produced on a large glass substrate. Each pixel is made up of three color units (or sub-pixels). If you have a panel with a resolution of 1280×1024, it actually has 3840×1024 transistors and subpixels.

The upper left corner of each subpixel (gray rectangle) is an opaque thin film transistor, and the color filter produces RGB primary colors. Each interlayer contains electrodes and grooves formed on the orientation film, and the upper and lower interlayers are filled with multiple layers of liquid crystal molecules (the liquid crystal space is less than 5×10-6m). In the same layer, although the position of the liquid crystal molecules is irregular, the long-axis orientation is parallel to the polarizer. On the other hand, between the different layers, the long axis of the liquid crystal molecule continuously twists 90 degrees along the parallel plane of the polarizer.

Among them, the orientation of the long axis of the two layers of liquid crystal molecules adjacent to the polarizer is consistent with the direction of the polarized light of the adjacent polarizer. The liquid crystal molecules near the upper interlayer are arranged in the direction of the upper trench, while the liquid crystal molecules in the lower interlayer are arranged in the direction of the lower trench. Finally, it is packaged into a liquid crystal box, and connected with the driver IC, control IC and printed circuit board.

Under normal circumstances, when the light is illuminated from the top down, usually only one Angle of light can penetrate down, through the upper polarizer into the groove of the upper sandwich, and then through the liquid crystal molecules twisted arrangement of the path through the lower polarizer, forming a complete light penetration path.

The mezzanine of the liquid crystal display is attached to two polarizing plates, which are arranged and transmitted at the same Angle as the grooves of the upper and lower mezzanine. When a certain voltage is applied to the liquid crystal layer, due to the influence of external voltage, the liquid crystal will change its initial state, no longer arranged in a normal way, and become erect. Therefore, the light passing through the liquid crystal will be absorbed by the second layer of polarizer and the entire structure will be opaque, resulting in black on the display screen. When the liquid crystal layer does not apply any voltage, the liquid crystal is in its initial state and will reverse the direction of the incident light by 90 degrees, so that the incident light of the backlight can pass through the entire structure, resulting in white on the display. In order for each individual pixel on the panel to produce the color you want, multiple cold cathode lamps must be used as a backlight for the display.