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Deciphering the Mechanics: How LCD Panels Bring Images to Life

The LCD panel is a common flat panel display technology that utilizes the optical properties of liquid crystal molecules to display images and text and is widely used in electronic devices and digital display systems. Its working principle is based on the control of the operation of liquid crystal molecules, by controlling the rotation of the liquid crystal molecules to regulate the transmittance of light, so as to form an image. This article will introduce how do LCD panels work.


Understanding Pixels


The picture you see is actually made up of countless small dots, which we call pixels. Each pixel is made up of three sub-pixels, red, green, and blue. Red, green, and blue are the three primary colors, and you can get all the colors you want by scaling the colors of the red, green, and blue sub-pixels so that each pixel dot displays its own color in its own way, ultimately piecing together the complete picture you see.


Light Polarization (Polarizer)


Each of the two glass substrates of the display has mutually perpendicular polarizers laminated to the outside of the substrate, and their directions of polarization are perpendicular to each other. When no current is passing, light between the polarizers is blocked by the first polarizer, so there is no display on the screen. When current is passed, the light passes through the polarizers that are perpendicular to each other, and the desired pattern of the light source is transmitted under the action of liquid crystal distortion.


Liquid Crystal Arrangement and Distribution under Voltage


When an electric field is applied to the liquid crystal molecules, they rotate the direction of the polarized light. When light passes through the first polarizer, if the liquid crystal molecules are aligned in the same direction as the direction of polarization, the light will be able to pass through the second polarizer and be displayed on the screen.


Image Display


By controlling the direction of the converted electrical signal and electric field and the strength of the electric field, the alignment of the liquid crystal molecules and the angle of distortion can be controlled correspondingly, thus realizing pixel-level image control. Then by adjusting and controlling different electric fields loaded on different pixel coordinates, the liquid crystal molecules will rotate to different degrees, thus presenting light and dark images and text.


Through this article, I believe you have a basic understanding of how LCD panels work. Comprehensively speaking, LCD display mainly involves the polarization of light, liquid crystal molecules in the electric field under the action of the distribution of the arrangement of electric field control. Through a series of auxiliary components, the final construction of a stable pattern.



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