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. It is perfect replacing mechanical button, not only from function effect, but also from sound effect and visual effect. As one of the newest computer output devices, touch panel is the simplest, easiest and natural way for human machine interaction so far. It is a revolutionary product which totally changes the appearance of multi-media devices that highly attracted attention. It is widely used in public information inquiry machines, office devices, industrial control devices, military commanding devices, electronic game machines, food ordering devices in cafeteria, multi-media teaching devices in school and so on.

The technique requirements of touch panel are that material transparent and absolute orientation. Firstly, Touch screen is the surface of LCD, so it must be transparent and people could see the video from LCD. That is the reason why chalk board and elevator switch button do not use LCD. Secondly, absolute orientation it means wherever your finger touches is the exact position and you do not need a second action. It is unlike the Computer mouse has a relative system and it needs an arrow to tell you the position. Touch panel does not have an arrow because an arrow would confuse the users.

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The thermal problem is the big bottleneck for the development of LED backlight. The most concerned issue for large size LED is that thermal increases with the time going on and it often accompanies by the variation of the wavelength and the reduction of the brightness. Therefore, the overall performance stability of backlight module is very important for both middle size laptop computer and large size liquid crystal television.

The combo RGB 3 in 1 top view LED and bottom backlight module with PCB material not only presents the excellent color performance and stability, but also efficiently manages the thermal problem.  From the image above, we can see the test result of 32 inch LCD TV temperature and time graph. At the beginning of the first 20 minutes, the heat will increase rapidly with time, but the then the heart increases very slow with time which we call the stabilization phase and the light performance is relative stable.  So we can conclude that LED backlight module can perform excellent temperature stability as long as the LED package and the thermal management are good.

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