Method for manufacturing touch screen linearization pattern
AssigneeeTurboTouch Technology Inc.
InventorChi-Ruey Chen
Life of this patent
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Abstract
A method for manufacturing a touch screen linearization pattern which is necessary for a five wire resistive type or current sensing type touch screen, and directly affects the accuracy, production price, and border area size of the touch screen, includes the steps of printing a linearization pattern on the border area of a conductive glass surface with a selected ink. The ink is made by blending highly conductive silver powder between about 59% to 62% in weight and carbon powder between about 14% to 16% in a contact agent solvent between about 24% to 25% in weight. The touch screen thus formed has a resistance value ratio of about ten between the square surface of the glass layer and the two ends of the linearization pattern.
Claims10
A method for manufacturing a linearization pattern for a touch screen including a glass layer having a surface on which a conductive layer having a low conductivity has been sputter coated, a linearization pattern, an isolation layer, a four wire silver printing layer and a tail cable connected to a controller, the controller being arranged to output four equal voltages to four ends of the touch screen and to measure current variation, comprising the steps of:
- making an ink by blending highly conductive material of silver powder in a percentage weight range of between about 59% to 62% and carbon powder in a percentage weight range of between about 14% to 16% in a contact agent solvent having a percentage weight range of between about 24% to 25%;
- and
- using the ink to print a linearization pattern on a border of the sputter-coated glass layer surface to form a linearization pattern such that a resistance value ratio between a square of the sputter-coated glass layer and two ends of the linearization pattern is about 10.
The method of claim 6, wherein the linearization pattern has a height of 10 micro meter which has a resistance of 1 ohm per squares and has a width of 3 mm and a length of 300 mm for a resistance of 100Ω at each side, and wherein the sputter-coated glass layer is Indium Tin Oxide glass which has a 1000Ω per square resistance, thereby providing a resistance ratio of 10:1 between the Indium Tin Oxide resistance value and the resistance value of the linearization patterns.
A method for manufacturing a linearization pattern for a touch screen including a glass layer having a surface on which a lower ITO conductive layer has been sputter coated, a linearization pattern, a set of insulation points, an isolation layer, a four wire silver printing layer, another isolation layer, an upper ITO conductive layer, a plastic layer and a tail cable connected to a controller, the upper ITO layer being contactable to the lower ITO layer for measuring the voltage of the contact point, comprising the steps of:
- making an ink by blending highly conductive material of silver powder in a percentage weight range of between about 59% to 62%, and carbon powder in a percentage weight range of between about 14% to 16% in a contact agent solvent having a percentage weight range of between about 24% to 25%;
- and
- using the ink to print a linearization pattern on a border of the sputter-coated glass layer surface to form a linearization pattern such that a resistance value ratio between a square of the sputter-coated glass layer and two ends of the linearization pattern is about 10.
Dependencies are inferred from the claim text.