Touch screen is a screen of Liquid Crystal Display (LCD). It can receive contact from outside, like man's finger. When you touch a picture button of LCD, the LCD screen would generate some kind of contact signal according to pre-programmed programs.

Nowadays the IT industry is developing quickly, and the LCD industry which is one of related industries is benefited from this trend.

The marked size of liquid crystal display is the actual use scope of the screen. For example, a 15.1 inch LCD display approximately equals to the visual scope of a 17 inch CRT screen.

Touch screen is a screen of Liquid Crystal Display (LCD). It can receive contact from outside, like man’s finger. When you touch a picture button of LCD, the LCD screen would generate some kind of contact signal according to pre-programmed programs.

LED is direct current driving and very low power consumption (single unit 0.03-0.06w). The conversion rate of electricity –light is close to 30%. Normally, the working voltage of LED is 2-3.6V and the working electricity is 0.02-0.003 A. And it means that the power consumption is less than 0.01w, and it saves 80% energy in the same illumination effect.

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The composition of liquid crystal is a kind of organic compound which center is a carbon molecule.

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As we know, the state of matter that people familiar with is gas, liquid, solid, ion and liquid crystal. Liquid crystal is the combination of special structure molecules. It is liquid crystal in a certain temperature range and crystal in a lower temperature. It not only has special physical property of flowing, but also has special opto-electronics property of crystallizing.

The diffusion film is the spread material that transforms the linear light source of CCFL or the point light source of LED into a uniform surface light source in the LCD module. The theory of LCD diffusion film is that making the light passes through the medium of different refractive index, which has been refracted, reflected and scattered, so the optical diffusion effect is made.

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