The touch technology of the projective capacitive panel of the projective capacitive touch screen is to etch different ITO conductive circuit modules on the double layer of ITO conductive glass coating.
The etching patterns on the two modules are perpendicular to each other, which can be regarded as continuous changes in the X and Y directions.
Since the x and Y modes are located on different surfaces, they form capacitor nodes at intersections.
The slider can be used as the drive line and the other slider as the test line.
When a current passes through one of the conductors in the drive line, if there is an external signal of capacitance change, the capacitance nodes on the other layer of wire will change.
The change in capacitance can be measured by an electronic circuit connected to it, and then the digital signal from the A/D controller will cause the computer to perform arithmetic processing to obtain the (x, y) axis position, and then reach the locating target.
During operation, the controller has a power flow to the drive line, causing each node and conductor to form a specific electric field.
Then, the capacitance changes between the electrodes are measured by the line scan sensor to realize multi-point positioning.
When finger or touch media approach, the controller quickly changes the capacitance between the touch node and the wire to confirm the position of the touch control.
This axis is driven by a set of AC signals and the response via the touch screen is measured by electrodes on the other axis.
Users call it "crossover" sensing, also known as projection sensing.
The sensor is coated with X and Y axis ITO patterns. When the finger touches the touch screen surface, the capacitance below the touch point will increase according to the proximity of the touch point. Continuous scanning on the sensor will detect the change value of the capacitance, and the control chip will calculate the touch point and return it to the processor.
