Principle recognition of cash register LED liquid crystal display

Whether it is a computer LED display or a cash register liquid crystal display, the LCD display screen is a layered structure composed of different parts. The LCD is composed of two glass plates, about 1 mm thick, and is composed of 5 μm containing liquid crystal (LC) material. Evenly spaced apart. Because the liquid crystal material itself does not emit light, there is a light pipe as a light source on both sides of the display screen, and a backlight plate (or a light homogenizing plate) and a reflective film on the back of the liquid crystal display screen, the backlight plate is composed of a fluorescent substance. Light can be emitted, the main function of which is to provide a uniform background light source. The light emitted by the backlight enters the liquid crystal layer containing thousands of crystal droplets after passing through the first polarizing filter layer. The crystal droplets in the liquid crystal layer are all contained in a small cell structure, and one or more cells constitute one pixel on the screen. Between the glass plate and the liquid crystal material is a transparent electrode, the electrode is divided into rows and columns, at the intersection of the rows and columns, by changing the voltage to change the optical state of the liquid crystal, the liquid crystal material acts like a small light valve. Around the liquid crystal material are a control circuit portion and a drive circuit portion. When the electrodes in the LCD generate an electric field, the liquid crystal molecules are distorted, and the light passing through them is regularly refracted, and then filtered through the second layer of the filter layer to be displayed on the screen.

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