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Why does the LCD screen need to be covered with glass?

Classification： Industry News

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Release Time：2023-09-14 15:24

The principle of display imaging of LCD screen is that without it, the image cannot be displayed. To be precise, that thing is called polarizer (English abbreviation: PLZ), which has the function of filtering light. The full name of polarizer is polarizing plate. LCD liquid crystal display display imaging must rely on polarizing plate. All liquid crystals have two front and rear polarizing plates that are closely attached to the liquid crystal glass, thus forming a liquid crystal plate with a total thickness of 1.5-2.8MM. If any polarizer is missing, the LCD panel will not be able to display images. Therefore, polarizer is a key component in the production of LCD screens.

If the LCD screen does not have this layer, you will not be able to see any display at all, because when the LCD screen is working, after filtering out the light in the X direction or Y direction, the remaining parallel light will not pass through the polarizer. With polarized display, you cannot see any display at all with the naked eye.

Polarizer is a soft and thin material. If there are scratches, punctures, or abrasions, it will not be suitable for production, so be careful when using it. Even if it is damaged a little, it will not affect the overall display effect. But it doesn't look that comfortable on the outside. It's better not to deliberately do any harmful actions such as pressing, scratching, or stabbing.

Therefore, that soft layer is called a polarizer, which functions with the liquid crystal to achieve optical rotation and development.

In the production process, people first print circuits on two pieces of general tempered glass (transparent ITO material), then apply frame glue around the two pieces, then align and press them together, and then Fill the middle of the glass on both sides with liquid crystal and seal the liquid crystal port. The next step is to affix a layer of polarizers above and below the glass. The polarizers attached to the upper glass and lower glass cannot filter out the same direction at the same time. For example, if the lower polarizer filters light in the No display can be seen, but in fact the LCD display is still working normally, but the polarization cannot be seen with the naked eye.