1. Projective capacitive contacts
Although the basic structure and working principle of a projected capacitive contact screen is the same as that of a four-wire impedance film, the projected capacitive impedance film does not go through the contact field, but captures the change in capacitance between the electrodes. Generally speaking, when used in the form of a capacitive sensor, it can be called a secondary extension of the contact switch. About contact switches.
The projection capacitance form does not require electrode deformation like the impedance film type, and can be detected from the surface of the contact plate up to 10 mm. In addition, the surface of the panel is covered with glass scars, and it has excellent durability and environmental resistance, but there is no change in capacitance, and the contact panel of the insulator does not work, so it cannot be operated when touched with gloves.
2. Surface capacitance contact
The surface capacitance method is the same as the projection capacitance method. Induce a change in capacitance. When the projection capacitance method is considered to be a four-wire resistance film method, the surface capacitance method is the same as the five-wire resistance film method, and the fifth line is the human body. It is composed of a transparent conductive film and electrodes at four corners. During operation, the electrodes at the four corners are applied the same voltage, and the panels form a uniform electrical gap.
When all are in phase, the capacitors on the panel are discharged. Flowing. On the other hand, when a finger touches the contact screen, the capacitor becomes grounded. The current flows from the corners through the fingers, and the current value of the electrodes closer to the contact part increases. At this moment, only the amount of current coming from the four corners is measured. This ratio can be used to determine specific parts.
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