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US 8,508,503 B2Granted
Touch panel and method of reducing noise coupled by a common voltage of a touch panel
AssigneeAu Optronics Corporation
InventorsJian-Hong Lin, Wen-Rei Guo, Ching-Hua Chuang
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Abstract
A touch panel includes a touch sensor, a liquid crystal panel, and a reverse circuit. The reverse circuit receives common voltage ripples of the liquid crystal panel, and outputs reversed common voltage ripples after reversing the common voltage ripples. After the touch sensor receives the reversed common voltage ripples, the touch sensor outputs a sensing signal according to the reversed common voltage ripples.
Claims14
A touch panel, comprising:
- a touch sensor for outputting at least one sensing signal corresponding to at least one object when the at least one object touches the touch panel;
- a liquid crystal panel comprising a common electrode, the liquid crystal panel used for executing at least one corresponding operation according to the at least one sensing signal;
- and
- a reverse circuit having a first terminal coupled to the liquid crystal panel for receiving common voltage ripples of the common electrode of the liquid crystal panel coupled to the touch sensor, and a second terminal coupled to the touch sensor for outputting reversed common voltage ripples;
- wherein the touch sensor is located on the liquid crystal panel.
2 more elements
A method of reducing noise coupled by a common voltage of a touch panel, the method comprising:
- a reverse circuit receiving common voltage ripples of a liquid crystal panel;
- the reverse circuit reversing the common voltage ripples;
- the reverse circuit outputting reversed common voltage ripples;
- a touch sensor receiving the reversed common voltage ripples;
- and
- the touch sensor outputting a sensing signal according to the reversed common voltage ripples.
3 more elements
Dependencies are inferred from the claim text.