Sidi Ke for your brief introduction: TFT capacitive screen works
Author: Shenzhen CDTech Electronics LTD. issuing time:2017-07-25 14:28:39Pageviews:1512【smallinBig】
Capacitive touch screen technology is the use of the body\'s current sensing work. Capacitive touch screen is a four-layer composite glass screen, the inner surface of the glass screen and the interlayer are coated with a layer of ITO, the outermost layer is a thin layer of siliceous glass protective layer, sand...
Capacitive touch screen technology is the use of the body's current sensing work. Capacitive touch screen is a four-layer composite glass screen, the inner surface of the glass screen and the interlayer are coated with a layer of ITO, the outermost layer is a thin layer of siliceous glass protective layer, sandwich ITO coating as a face, four corners Four electrodes, the inner ITO for the shield to ensure a good working environment. When the fingers touch on the metal layer, due to the human body electric field, the user and the touch screen surface to form a coupling capacitor, for high frequency current, the capacitor is a direct conductor, so the fingers from the contact point suction a small current. This current flows out of the electrodes on the four corners of the touch screen, respectively, and the current flowing through the four electrodes is proportional to the distance from the finger to the four corners. The controller calculates the position of the touch point by accurately calculating the four current ratios The
At present, the bottleneck of production capacity of Glass capacitive screen lies in the Sputtering process. In the CF (color film) process of ordinary TFT-LCD, the sputtering process takes only 24 seconds, but the Sputter produced by the projection capacitor screen 65-70 seconds, that is, almost half of the production capacity.
In addition, the purchase of sputtering equipment is also more time-consuming, purchase period of at least six months. Due to the time consuming of the sputtering process, the capacity expansion is slow, and the manufacturers can not increase the output on the basis of the original production capacity. Foxconn to OCA film demand forecast next year, Apple iPad orders are expected to 40 million units; touch screen factory capacity is far from enough.
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