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LCD lighting technology

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The display device is a passive type display device, which does not emit light by itself, and is realized by modulating the external light.
External light is a prerequisite for the display of liquid crystal display devices.Therefore, in the liquid crystal display assembly, use, skillfully solve the lighting, not only can ensure and improve the quality of liquid crystal display (LCD) and liquid crystal display lighting technology points set technology for natural light lighting technology and external light source. Outside the light source setting, also has the back light source, the front light source and the projection light source three kinds of technology .Here, we make a brief introduction of the more common backlight:

The two main tasks of backlight technology are:
1 make the liquid crystal display device in the environment with no outside light can use;
2 improve the background brightness, improve the display effect.

Common back lighting source classification：
Electro luminescence (EL): EL back light source with a thin thickness, light weight, uniform light emission. It can be used in different colors, but most commonly used in LCD white light. EL back light source power consumption is low, only the voltage 80-110vAC, through the transformer will be 5V, 12V or 24VDC to get. The half life of EL backlight is about 2000-5000 hours.
Light emitting diode (LED): LED back light source is mainly used for character module. Longer than EL (at least 5000 hours), the light is stronger, and the energy consumption is greater. The most solid state device, it directly uses the.LCD 5VCD directly in the general arrangement in the back of the LCD, the thickness to increase 5mm, LED can send different colors of light, the most common is Huang Lvguang.

Cold cathode fluorescent lamp (CCFL): CCFL can provide low energy consumption, bright white light. It consists of a cold cathode fluorescent tube, which is distributed in the window area through the diffuser. Backlight has the advantages of small volume, low power consumption, power but CCFL need a transformer to supply 270-300VAC. It is mainly used for graphics LCD, life up to 10000-15000 hours.