Working Principle of LCD Touch Screen

Views : 649
Author : Touch LCD screen supplier
Update time : 2019-06-28 15:55:25
Usually the working part of the touch LCD screen is generally composed of three parts: there are two layers of transparent resistive conductor layer, the isolation layer between the two layers of conductors and the electrode. Resistive conductor layer is generally made of resistive materials, such as indium tin oxide coated on the substrate, the upper substrate using plastic, the lower substrate using glass. The isolation layer is a viscous insulating liquid material, such as polyester film. The conductive property of the electrode is about 1000 times that of ITO. 
 

 

When touching the lcd display screen, the upper and lower conductor layer is equivalent to the resistance network, as shown in the figure above. When a certain layer of electrode adds voltage, a voltage gradient is formed on the network. If there is an external force that causes the upper and lower layers to contact at one point, the voltage at the contact point can be measured at the other layer where the voltage is not applied to the electrode, and the coordinates of the contact point can be obtained. If a voltage is added to the electrode at the top layer, a voltage gradient is formed on the top conductor layer, and if there is an external force that causes the upper and lower layers to contact at a certain point, the voltage at the contact point can be measured at the bottom layer. Then according to the distance relationship between the voltage and the electrode, we know the X coordinates here. The voltage is then switched to the bottom electrode and the voltage at the contact point is measured at the top level to know the Y coordinates.

XIANHENG specializes in the production and sale of touch LCD screens such as industrial display screen, industrial touch screen and optical fitting. The products are widely used in medical equipment, industrial handheld terminals, Internet of Things terminals and smart home. Any questions please feel free to contact us by e-mail to [email protected].
Related News
Read More >>
Market Prospect of Outdoor LCD Advertising Machine Market Prospect of Outdoor LCD Advertising Machine
May .25.2022
The outdoor LCD advertising machine uses LCD monitors to play video advertisements, which is especially suitable for the comprehensive multimedia technology of high-end brands to deliver a full range of product information and promotional information to consumers. Different from newspapers, magazines, radio, television and other media, LCD advertising machine has a wide range of applications and remarkable effects.
Comparison of 3 Different Models of BOE 18.5-inch LCD Screen Comparison of 3 Different Models of BOE 18.5-inch LCD Screen
Apr .21.2022
There are 3 outstanding models of BOE's popular 18.5 inch LCD screen, namely the DV185WHM-NM1, QV185FHB-N81 and MV185WHB-N20, of which the MV185WHB-N20 is available in both normal and high brightness versions. So what's the difference among them?
3 Common Problems of Using Capacitive Touchscreen 3 Common Problems of Using Capacitive Touchscreen
Feb .24.2022
Users may encounter some problems when using capacitive touch screens. When using it for the first time, the user first correctly installs the driver needed for the capacitive touch screen according to the requirements of the relevant instructions, and then runs the screen calibration program to calibrate the screen. In fact, the touch screen will be calibrated before it leaves the factory, so end users don't have to worry. In addition, users may encounter the following three situations when using a capacitive touch screen.
3 Differences Between Assembly LCD Module and Original LCD Screen 3 Differences Between Assembly LCD Module and Original LCD Screen
Feb .17.2022
In the LCD display screen industry, LCD has been called two ways, one is the assembly LCD module, the other is the original LCD screen. Do you know the difference between them? To sum up, there are three main obvious differences.
Know more about LCD technology?