Supply Custom Multi Touch TFT Resistive Touch Screen Factory

12-08-2019

Multi Touch TFT Resistive Touch Screen

Resistive touch screens can be subdivided into three categories according to the number of inductive wires on the touch screen: 4, 5 and 8 wires. The bar electrodes of the 4-wire touch screen are installed on two different resistance layers (X+ and X- on the same layer, Y+ and Y- on the other resistance layer). The 5-wire touch screen has circular electrodes (X+, X-, Y+, and Y-) on the bottom layer only. The top layer is used to measure the voltage during the touch process, and the voltage gradient is applied only to the bottom layer.


Supply Multi Touch Resistive Touch Screen

The 8-wire touch screen works similarly to the 4-wire touch screen. Only one reference voltage wire was added to each wire, so the final number of buses reached 8. The new 4 wires are used to provide reference voltage to the original 4 wires. The 8-wire touch screen adopts the measuring principle of proportional measuring adc. Four-wire touch screens are widely used in low-end consumer electronics because of their low cost and simple touch-sensing algorithms. The 5-wire and 8-wire touch screens are mainly used for expensive high-end medical devices and important industrial controllers.


Custom Resistive Touchscreen

The main components of the touch screen solution include a touch screen panel, a touch screen controller (TSC), a display panel, and a main processor, which can be a low-end microcontroller. The main processor manages the initialization of the touch screen controller and reads the digital coordinate data using the one - or two-wire interface protocol (I2C/SPI). The main processor is also responsible for converting user touches into desired operations, such as volume adjustments, image changes, or writing displays. Most consumer electronics products have display panels on which human-computer interaction ICONS can be displayed.


TFT Resistive Touchscreen Factory

To design an application system with a tactile user interface, the design complexity depends on the resolution requirements of the touch screen. The resolution of touch screen also depends on the resolution of analog to digital converter of touch screen controller. Another important factor is the power consumption of touch screen controller. It is recommended to choose a controller with interrupt function and low power standby mode. When there is no touch operation, the controller enters a low-power standby state to save energy. When a touch event is detected, the controller wakes up to perform the touch voltage decoding function. This becomes a basic requirement for portable devices, because every coulomb of battery power in a portable device is valuable.


Using a touchscreen controller with a built-in cache is useful for frequent touch detection applications. For example, writing is a continuous touch operation, and if the touchscreen controller includes a FIFO cache, the data can be processed after the FIFO cache is full, which reduces the processing overhead of the main processor. When the screen is larger (> 6 inches), the noise picked up by the conductive panel of the touch screen will affect the precision of the touch screen. Adding capacitors on the touch screen (on the X+/X-, Y+/ Y-axis) can reduce high-frequency noise.


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