Touch cell structure of a touch panel and the touch panel using the same
First Claim
1. A touch panel comprising:
- a conductive pad that forms a capacitance with respect to a finger of a human body or a touch unit having a conductive characteristic similar to the finger;
a three-terminal type switching device that has an input terminal, an output terminal, and a control terminal, wherein the input terminal is connected to a power supply, the output terminal is connected to the conductive pad, and the three-terminal type switching device is turned on/off in response to a control signal that is applied to the control terminal, thereby supplying a charging signal to the conductive pad;
a capacitor that is connected to the output terminal of the three-terminal type switching device; and
a touch position detector that detects a touch input according to a voltage change between a first detected voltage at a time of non-touch input and a second detected voltage at a time of the touch input, wherein the first detected voltage and the second detected voltage are determined based on a kick back voltage that is proportional to a magnitude of a capacitance formed by the capacitor and inversely proportional to a magnitude of a capacitance formed by the conductive pad.
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Accused Products
Abstract
Provided is a touch cell structure for a touch panel in which a touch cell is configured into a new pad to gate mode in order to solve a problem of a conventional capacitive-type touch input device. The touch cell structure includes: a conductive pad that forms an electrostatic capacitance with respect to a touch unit when a finger of a human body or the touch unit having an electrical characteristic similar to the finger approaches the conductive pad within a predetermined distance; and a three-terminal type switching device whose gate terminal is connected with the conductive pad and whose output signal is changed in correspondence to a change in electric potential of the gate terminal of the three-terminal type switching device by the electrostatic capacitance between the touch unit and the conductive pad. Since the potential of the gate terminal of the switching device is determined by an electrostatic capacitance formed in the conductive pad, a difference of the output signal output from the switching device becomes large depending on whether a touch input occurs or not.
11 Citations
11 Claims
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1. A touch panel comprising:
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a conductive pad that forms a capacitance with respect to a finger of a human body or a touch unit having a conductive characteristic similar to the finger; a three-terminal type switching device that has an input terminal, an output terminal, and a control terminal, wherein the input terminal is connected to a power supply, the output terminal is connected to the conductive pad, and the three-terminal type switching device is turned on/off in response to a control signal that is applied to the control terminal, thereby supplying a charging signal to the conductive pad; a capacitor that is connected to the output terminal of the three-terminal type switching device; and a touch position detector that detects a touch input according to a voltage change between a first detected voltage at a time of non-touch input and a second detected voltage at a time of the touch input, wherein the first detected voltage and the second detected voltage are determined based on a kick back voltage that is proportional to a magnitude of a capacitance formed by the capacitor and inversely proportional to a magnitude of a capacitance formed by the conductive pad. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification