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How can an embedded touch display be used in a wide temperature environment?

How can an embedded touch display be used in a wide temperature environment?


Embedded touch display has high performance requirements because of its application in the harsh industrial environment such as high and low temperature, dust, water, oil and so on.Especially in the high and low temperature environment, it is a great challenge for embedded touch display products.Then, the high wide temperature performance of embedded touch display is very necessary.



So how can embedded touch display be used at a wide temperature?Next, explore with Xiaobian:



1. Wide-temperature mode and working principle

1) Mode 1: low temperature heating mode


There are two ways of low temperature heating, point by point heating and whole surface heating.The overall power consumption of such a display will increase by 4-6 times.For example, the power consumption of 15 inch LCD is 20w at room temperature (22 ℃) and 90-120w at low temperature (-40 ℃), which makes the liquid crystal outflow or reduction difficult sometimes during the long-term use of the machine.


2) Mode 2: Improve the brightness of the LCD screen


The special high voltage strip (which can produce the starting voltage of 2000v-3000v) is used to light the backlight tube in the low temperature environment (-40 ℃). Because the huge heat generated by the backlight tube makes the liquid crystal warm up, this way kills two birds with one stone, which solves the problem of low temperature operation of the liquid crystal and the problem of visibility in the sun, and this way is called brightening way for short.


The drawbacks of mode one and mode two:


① Both of these methods increase many accessories and reduce the reliability.


② assembly production is more troublesome, easy to cause defective products, and the defective product rate is higher.


③ The ability of the device to resist shock and vibration is decreased.


(4) In the aging test, it was found that the aging speed was very fast at 50 ℃, especially in the brightening mode, and the life span was only 1/10 of the normal.


3) Method 3: The new liquid crystal high and low temperature application technology, the product can work normally at low temperature without heating or brightening. The basic principle is as follows: the liquid crystal does not freeze or the physical state occurs at low temperature (-40 ° C). Change, otherwise neither the heating method nor the brightening method can work, so we think of using software to correct the drift of its electrical characteristics. Try to trigger the operation of the liquid crystal at low temperatures. This requires adjusting the driving timing of the liquid crystal and the like.Through a large number of experimental studies and a wide range of applications, this technology is very mature, regardless of how the ambient temperature changes, by widening the trigger timing and matching the corresponding drive can ensure the normal operation of the LCD.