Monochrome LCD Display Imaging Principle

- Nov 06, 2017-

Monochrome LCD displays are layered structures of different parts. The LCD is composed of two glass plates, which are about 1mm thick, separated by a 5 mu m evenly spaced by the liquid crystal (LC) material. Because liquid crystal material itself does not shine, so on both sides of the screen is equipped with lamp as the light source, and there is a back plate on the back of LCD display (or well plate) and the reflective film, back plate is composed of a fluorescent substance can shoot the light, the main role is to provide uniform background light source.

A monochrome LCD LCD display principle

The light from the back plate enters the liquid crystal layer that contains thousands of crystalline droplets after passing through the first layer of polarization filtration layer. Crystal droplets in the liquid crystal layer are all contained in tiny cell structures, one or more cells that make up a pixel on the screen. Between glass and liquid crystal material is the transparent electrode, the electrode was divided into rows and columns, rows and columns of the intersections, by changing the voltage and change the state of liquid crystal optical, liquid crystal materials similar to the effect of small light valve. The periphery of the liquid crystal material is the control circuit part and the driving part.

When the electrode in the LCD that produce electric field, the liquid crystal molecules will generate distortion, which will be through the light of the rules of refraction, and then after the second filter layer of filter is displayed on the screen.

LCD liquid crystal display technology is to insert liquid crystal into two columns with grooves. The slots in the two planes are perpendicular to each other (intersecting at 90 degrees). That is to say, if a molecule in the plane of the north and south, are the other molecules in the plane of the east-west, and lies between two surfaces of molecules is forced into a state of 90 - degree turn. As the light travels in the direction of the molecules, the light is turned 90 degrees by the liquid crystal. But when a voltage is added to the liquid crystal, the molecules are rearranged vertically to allow the light to shoot straight out without any twist.

LCDS are dependent on polarized filters (slices) and light itself. Natural light diverges at random from all directions. The polarization filter is actually a series of increasingly thin parallel lines. These lines form a net that blocks all light that is not parallel to these lines. The line of the polarized filter is exactly the same as the first one, so it can completely block out the polarized light. Only the two filters are completely parallel, or the light itself has been reversed to match the second polarized filter, allowing light to penetrate.

The LCD is made up of two perpendicular polarized filters, so in normal circumstances all attempts to penetrate the light should be blocked. However, since the two filters are full of distorted liquid crystals, the liquid crystals will be turned around 90 degrees after the light is worn out of the first filter, and finally worn out from the second filter. On the other hand, if you add a voltage to the liquid crystal, the molecule will be rearranged and completely parallel, so that the light will not turn around, so it will be blocked by the second filter. All in all, it blocks the light and emits it without charge.

However, the liquid crystals in the LCD can be changed so that the light is emitted when the electricity is added, but when it is not charged, it is blocked. But because the computer screen is almost always on, only the "power of the power to block the light" can achieve the most power-saving goal


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