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US 11,079,876 B2Granted
Touch display device, touch driving circuit and touch driving method thereof
AssigneeLG Display Co., Ltd.
InventorsJaehun Jun, HyeongWon Kang, MyungHo Shin
Life of this patent
Estimating the term…
Abstract
Embodiments of the present disclosure relate to a touch display device, a touch driving circuit, and a touch driving method, and more specifically, to a touch display device, a touch driving circuit, and a touch driving method for enabling a signal-to-noise ratio (SNR) and sensitivity of touch sensing to be improved by implementing a code division sensing effect for the self-capacitance sensing scheme.
Claims18
A touch display device, comprising:
- a touch panel including a plurality of touch electrodes and a plurality of touch lines;
- a multiplexer connected to the touch electrodes through the touch lines, the multiplexer configured to output a code division sensing signal obtained by adding, in a code division form, touch sensing signals provided from touch electrodes of the plurality of touch electrodes that are selected by a code division control signal;
- and
- a touch sensing circuit configured to:
- calculate capacitances in the plurality of touch electrodes based on the code division sensing signal from the multiplexer, and
- detect a touch presence or a touch coordinate.
3 more elements
A touch driving circuit, comprising:
- a multiplexer connected to a plurality of touch electrodes through a plurality of touch lines, the multiplexer, in operation, outputting a code division sensing signal obtained by adding, in a code division form, touch sensing signals provided from touch electrodes of the plurality of touch electrodes that are selected by a code division control signal;
- and
- a touch sensing circuit, in operation, calculating capacitances in the plurality of touch electrodes based on the code division sensing signal from the multiplexer, the touch sensing circuit, in operation, detecting a touch presence or a touch coordinate.
A touch driving method, comprising:
- applying code division control signals to a multiplexer connected to a plurality of touch electrodes through a plurality of touch lines;
- outputting a code division sensing signal, through the multiplexer, which are obtained by adding, in a code division form, touch sensing signals provided from touch electrodes of the plurality of touch electrodes that are selected by the code division control signal;
- and
- detecting a touch presence or a touch coordinate by calculating capacitances in the plurality of touch electrodes based on the code division sensing signal from the multiplexer.
1 more element
A touch display device, comprising:
- a touch panel including a plurality of touch electrodes and a plurality of touch lines;
- and
- a touch driving circuit for sensing the touch electrodes through the touch lines,
- wherein the touch driving circuit includes a first multiplexer including n touch line channel ports, wherein the n is a natural number greater than or equal to 3,
- wherein the n touch line channel ports are electrically connected to n touch electrodes through n touch lines, respectively, and
- wherein during a first period of the touch panel, a touch driving signal is concurrently applied to (n−k) touch electrodes among the n touch electrodes connected with the n touch line channel ports and a load-free driving signal with a same phase to the touch driving signal is concurrently applied to k touch electrodes, wherein the k is a number smaller than n by 1 or more.
3 more elements
Dependencies are inferred from the claim text.