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The Working Principle Of LCD Display

The Working Principle Of LCD Display

Dec 18, 2017

The working principle of LCD display: from the structure of LCD, the LCD screen used by notebook computer or desktop system is made up of different parts. The LCD is made up of two glass plates with a thickness of about 1mm, which is separated by a uniform interval of 5 mu m containing liquid crystal materials. Because the liquid crystal material itself is not light, so the screen on both sides with a lamp as the light source, and a backlight in liquid crystal display on the back (or uniform plate) and reflective film, backlight board is composed of a fluorescent substance can emit light, its main function is provided for uniform background light.

The light emitted by the backlight passes through the first layer of polarizing filter layer into the liquid crystal layer containing thousands of liquid liquid drops. The liquid droplets in the liquid crystal layer are included in the tiny cell structure, and one or more cells form a pixel on the screen. The transparent electrode between the glass plate and the liquid crystal material is divided into rows and columns, and the rotatory state of the liquid crystal is changed by changing the voltage at the intersection point between the row and the column. The action of the liquid crystal material is similar to a small light valve. The periphery of the liquid crystal material is the part of the control circuit and the driving circuit. When the electrode in LCD generates electric field, the liquid crystal molecules will distort, so that the rays passing through it will be refracted regularly, and then filtered through second layers of filter layer to show on the screen.