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Touchscreen
Manufacturing of capacitive and resistive, custom-designed touch screen panels
A widely used HMI solution that gives your device a modern look.
Our capacitive and resistive touch panels can be mounted on most displays.
Capacitive touch screens operate based on the capacitive change of the touched area. The panel is practically a capacitance matrix, the capacitance change of which is decoded by the appropriate electronics and converted into an output signal.
Resistive touch panels, on the other hand, have a linear, X and Y resistance output (4 pins in each case), which can be easily and accurately converted to the coordinate of the touch.
Touchscreen panel manufacturing
Capacitive touchscreen operation
The principle of operation of a capacitive touch screen is that two transparent films with different orientations (X and Y) containing conductive tracks are placed on top of each other. The two conductive films are separated by an insulating layer of high optical clarity. This creates a capacitance matrix. The number of output points depends on the screen size and the resolution of the matrix.
When we touch an area, capacitance changes occur around that area. The area where the change is greatest is where we touched the display.
With appropriate decoding electronics, we can read the exact coordinates and convert them into the communication protocol of the receiving device (I2C, RS232, USB, CAN, etc.).
Its advantage over the resistive design is that 'multi-touch' operation can be implemented and there are no small spacer dots visible between the two layers.
The disadvantages are higher manufacturing cost, more complex decoding electronics, lower (non-linear) resolution, and more sensitivity to the environment.
Resistive touchscreen operation
The principle of operation of the resistive touch screen is that there is a transparent, conductive layer on the entire surface of two foils, turned over each other. This layer has a specific resistance (Ohm/cm). Vertical, nearly 0 Ohm conductive stripes are added to the edges of the lower layer, so that the resistance in the X direction can be determined. There are horizontal conductive stripes on the edges of the upper foil, so that the resistance in the Y direction can be determined. The two conductive layers are separated from each other by small spacer dots.
When we touch an area, the conductive layers of the lower and upper foils come into contact and the position of the touch can be precisely determined from the resistance values in the X and Y directions.
Regardless of size, they always have 4 terminals.
With appropriate decoding electronics, we can read the exact coordinates and convert them into the communication protocol of the receiving device (I2C, RS232, USB, CAN, etc.).
Its advantage over capacitive designs is lower manufacturing cost, simpler decoding electronics, and precise, linear operation. Furthermore, it is not sensitive to the environment.
The disadvantage is that it cannot be used for multi-touch and the tiny spacer dots are slightly visible.
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