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US 8,274,493 B2Granted
Touch panel and portable electronic device thereof
AssigneeAu Optronics Corporation
InventorsMei-Sheng Ma, Hsin-Hung Lee, Yao-Jen Hsieh, Yung-Hsien Ho, Heng-Sheng Chou, Chun-Huai Li, Meng-Hsiang Chang
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Abstract
A touch panel and a portable electronic device thereof are provided. The present invention can accurately determine a position touched by a user on the touch panel by judging whether or not a potential voltage value between a reference capacitor and a sensing capacitor of a pixel having a sensing area being changed, or to determine whether a switch of a pixel having the sensing area being conducted.
Claims6
A touch panel, comprising:
- a first substrate;
- a plurality of pixel structures, arranged on the first substrate in an array, wherein at least one first pixel structure in each M×N pixel structures comprises a first sensing area, where M and N are positive integers, and the first pixel structure comprises:
- an active device, disposed on the first substrate and located at the first sensing area, wherein the active device is electrically connected to a scan line and a readout line, and a passivation layer covers the active device;
- and
- a sensing electrode, disposed on the passivation layer and located at the first sensing area, wherein the sensing electrode is electrically connected to the readout line through the active device, and a portion of the scan line is located between the first sensing area and the sensing electrode to form a reference capacitor;
- a second substrate, having a second sensing area corresponding to the first sensing area;
- a black matrix layer, disposed on the second substrate and located at the second sensing area;
- a spacer, disposed on the black matrix layer and located at the second sensing area;
- and
- a common electrode, covering a portion of the black matrix layer and the spacer, wherein there is a pitch between the common electrode on the spacer and the sensing electrode to form a sensing capacitor.
7 more elements
A touch panel, comprising:
- a plurality of pixel circuits arranged in an array, wherein at least one first pixel circuit in each M×N pixel circuits comprises:
- an active device, having a gate, a source and a drain, wherein the gate is electrically connected to a scan line, and the source is electrically connected to a readout line;
- a reference capacitor, electrically connected between the scan line and the drain;
- and
- a sensing capacitor, electrically connected between the drain and a common electrode, where M and N are positive integers.
2 more elements
Dependencies are inferred from the claim text.