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Tft capacitive touch manufacturers will show you: What is the principle of capacitive touch screen
Release time:
2021-05-24 09:20
Source:
The manufacturer of tft capacitive touch tells you that capacitive touch screens are widely used for the friendly man-machine interface that people provide. With low power consumption, long life, and smooth operation performance, capacitive touch screens are sought after by the market, and various capacitive touch screen products have Come out. The manufacturer of tft capacitive touch tells you that as the process progresses and batches, its cost continues to drop, gradually replacing resistive touch screens.
The manufacturer of tft capacitive touch tells you that the surface capacitive touch screen only uses a single layer of ITO, when a finger touches the surface of the screen, a certain amount of charge will be transferred to the human body. The tft capacitive touch manufacturer tells you that in order to recover these charge losses, the charge is replenished from the four corners of the screen. The amount of charge added in each direction is proportional to the distance of the touch point. We can calculate the position of the touch point from this.
The manufacturer of tft capacitive touch tells you that the surface capacitive ITO coating usually needs to add linearized metal electrodes on the periphery of the screen to reduce the influence of corner/edge effects on the electric field. Sometimes there is an ITO shielding layer under the ITO coating to block noise. The surface capacitive touch screen needs to be calibrated at least once before it can be used.
Compared with the surface capacitive touch screen, the inductive capacitive touch screen can penetrate a thicker cover layer and does not require correction. The tft capacitive touch manufacturer tells you that the inductive capacitive type etches different ITO modules on the two layers of ITO coatings. It is necessary to consider the total impedance of the modules, the impedance of the connecting lines between the modules, and the parasitic capacitance generated at the intersection of the two layers of ITO modules, etc. factor. The tft capacitive touch manufacturer tells you that in order to detect the finger touch, the area of the ITO module should be smaller than the area of the finger. When a diamond pattern is used, the diagonal length is usually controlled at 4 to 6 mm.
In addition, the bottom of the touch screen is the LCD display. The manufacturer of tft capacitive touch tells you that its surface is also conductive. This will generate parasitic capacitance with the ITO module of the ITO coating nearby. We usually need to be between the two layers. Keep a certain air layer to reduce the influence of parasitic capacitance.
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Microtech Technology Company Limited established in 2001,offers professional design and manufacturing services for hundreds types of Liquid Crytal Display modules and Touch Panels-TN,FSTN,TFT,RTP,CTP.
