Touch cell structure of a touch panel and the touch panel using the same
First Claim
1. A touch panel comprising:
- a light transmissive substrate;
touch cells that are arranged in a matrix form on the light transmissive substrate and located in an active area of the light transmissive substrate, in which each touch cell comprises;
a conductive pad;
a first three-terminal type switching device whose gate terminal is connected to a first signal line and whose output terminal is connected to the conductive pad, and configured to be turned on/off according to a control signal applied to a gate terminal of the first three-terminal type switching device, thereby supplying a charging signal to the conductive pad; and
a second three-terminal type switching device whose gate terminal is connected to the conductive pad and whose output signal is changed in correspondence to a change in electric potential of the gate terminal of the second three-terminal type switching device by an electrostatic capacitance between a finger of a human body or a touch unit having an electrical characteristic similar to the finger and the conductive pad; and
a touch position detector that recognizes a touch input from the output signal of the second three-terminal type switching device,wherein the electric potential of the gate terminal of the second three-terminal type switching device depends on a kick back difference between at the time when no touch input occurs and at the time when a touch input occurs, andwherein the first signal line is a signal line for applying a charging signal to the conductive pad, the control signal is applied by a second signal line other than the first signal line, and a multi-touch input is recognized by sequentially conducting the first three-terminal type switching device with sequentially applied scan pulse.
1 Assignment
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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
14 Claims
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1. A touch panel comprising:
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a light transmissive substrate; touch cells that are arranged in a matrix form on the light transmissive substrate and located in an active area of the light transmissive substrate, in which each touch cell comprises; a conductive pad; a first three-terminal type switching device whose gate terminal is connected to a first signal line and whose output terminal is connected to the conductive pad, and configured to be turned on/off according to a control signal applied to a gate terminal of the first three-terminal type switching device, thereby supplying a charging signal to the conductive pad; and a second three-terminal type switching device whose gate terminal is connected to the conductive pad and whose output signal is changed in correspondence to a change in electric potential of the gate terminal of the second three-terminal type switching device by an electrostatic capacitance between a finger of a human body or a touch unit having an electrical characteristic similar to the finger and the conductive pad; and a touch position detector that recognizes a touch input from the output signal of the second three-terminal type switching device, wherein the electric potential of the gate terminal of the second three-terminal type switching device depends on a kick back difference between at the time when no touch input occurs and at the time when a touch input occurs, and wherein the first signal line is a signal line for applying a charging signal to the conductive pad, the control signal is applied by a second signal line other than the first signal line, and a multi-touch input is recognized by sequentially conducting the first three-terminal type switching device with sequentially applied scan pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification