Capacitive touch screen and manufacturing method thereof
A technology of capacitive touch screen and production method, which is applied in the direction of electric digital data processing, instrument, input/output process of data processing, etc., can solve the problems of unrefined organic film, low safety, complicated manufacturing process, etc. Erosion phenomenon, prevention of voltage inclination, and simple manufacturing process
Inactive Publication Date: 2010-03-03
苏州超联光电有限公司
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Problems solved by technology
In this state, when voltage is applied to the wiring part, the ionization tendency will be generated due to the voltage gradient, and the low metal will change into metal ions, so the water will turn into a polar solvent, which will cause the metal wiring to be disconnected, which is the phenomenon of electric corrosion. Causes the touch screen to malfunction
[0006] In view of the above-mentioned technical problems, the generally adopted method is to vapor-deposit a layer of insulating film (SiO2) on the metal wiring. 2 film, etc.), since this step must be completed in a vacuum container, the manufacturing process is complicated and the cost is high, and the evaporated organic film is not delicate, and the thickness must be very thick
Another method adopted in the prior art is to paste a PET film with an adhesive on the metal wiring (commonly known as OCA). Since the adhesive only adheres to the surface of the glass, water vapor easily enters from the surface of the PET film. There is a high possibility of electric corrosion in the long-term safety test, so this method is only suitable for occasions with low safety
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[0028] The invention discloses a capacitive touch screen, such as figure 1 As shown, it includes a transparent substrate 1, generally glass. The substrate 1 is provided with at least one transparent electrode conductive layer, and a metal wiring 3 leads out from each of the electrodes 2 of the transparent electrode conductive layer, and one end thereof is a terminal portion 4 . In order to prevent the occurrence of voltage gradient and electric corrosion, an insulating film layer 5 is printed on the surface of the metal wiring 3 . The material of the insulating film layer is composed of epoxy-based, carbolic acid-based, acrylic-based, vinyl resin mixed resin, defoaming agent and solvent, and its specific gravity is 40:2:58. The thickness of the insulating film layer is generally 20 μm.
[0029] The invention also discloses a manufacturing method of a capacitive touch screen, such as figure 2 shown, including the following steps:
[0030] a) select a glass substrate for us...
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The invention provides a capacitive touch screen and a manufacturing method thereof, the capacitive touch screen comprises a transparent substrate, at least one transparent electrode conductive layeris arranged on the substrate, a metal wiring is arranged on each electrode of each transparent electrode conductive layer for leading out, and an insulating film layer is printed on the surface of each metal wiring. The capacitive touch screen has the beneficial effects that the manufacturing technology is simple, the cost is very low, the capacitive touch screen can effectively prevent the phenomena of voltage tilting and electric erosion, and the safety is very high.
Description
technical field [0001] The invention relates to an input device for human-machine interaction, in particular to a capacitive touch screen. Background technique [0002] The capacitive sensing touch screen works by using the current induction of the human body. When a finger touches the metal layer, due to the electric field of the human body, a coupling capacitor is formed between the user and the surface of the touch screen. For high-frequency current, the capacitor is a direct conductor, so the finger absorbs a small current from the contact point. This current flows from the electrodes on the four corners of the touch screen, and the current flowing through these four electrodes is proportional to the distance from the finger to the four corners. The controller obtains the position of the touch point through accurate calculation of the four current ratios. . [0003] In existing capacitive touch screens, one or more conductive layers of transparent electrodes are usuall...
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IPC IPC(8): G06F3/044
Inventor伊藤正树
Owner苏州超联光电有限公司