LIQUID CRYSTAL DISPLAY DEVICE
First Claim
1. A display device comprising:
- a display panel including a plurality of pixels, a plurality of detection electrodes, and common electrodes divided into M blocks when M is an integral number of 2 or more (M≧
2);
a driver circuit applying a common voltage and a touch panel scanning voltage to the common electrodes of each of the M divided blocks; and
a detector circuit detecting a touch signal of the plurality of detection electrodes,wherein the common electrodes of each of the M divided blocks are shared with the respective pixels, and are also used as scanning electrodes,wherein the driver circuit sequentially applies the touch panel scanning voltage to the common electrodes of each of the M divided blocks,wherein the detector circuit determines;
in a normal touch detection process, a touch event by detecting the touch signal of the plurality of detection electrodes when the touch panel scanning voltage is applied to the common electrodes of each of the M divided blocks; and
in a ghost touch detection process, a ghost touch event by detecting the touch signal of the plurality of detection electrodes without applying the touch panel scanning voltage to the M divided blocks, andwherein a threshold value for determining the touch event of the normal touch detection process is different from that for determining the ghost touch event of the ghost touch detection process.
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Accused Products
Abstract
An in-cell type liquid crystal display device includes a first unit that detects whether a touch is present, or not, on the basis of a current flowing in a plurality of detection electrodes when a touch panel scanning voltage is applied to counter electrodes of each of M (M≧2) divided blocks, and a second unit that detects noise on the basis of a current flowing in the plurality of detection electrodes, assuming that an (M+1)th counter electrode is present for the counter electrodes of each of the M divided blocks, and assuming that a touch panel scanning voltage synchronous with the touch panel scanning voltage applied to the counter electrodes of each of the M divided blocks is applied to the (M+1)th counter electrode.
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Citations
12 Claims
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1. A display device comprising:
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a display panel including a plurality of pixels, a plurality of detection electrodes, and common electrodes divided into M blocks when M is an integral number of 2 or more (M≧
2);a driver circuit applying a common voltage and a touch panel scanning voltage to the common electrodes of each of the M divided blocks; and a detector circuit detecting a touch signal of the plurality of detection electrodes, wherein the common electrodes of each of the M divided blocks are shared with the respective pixels, and are also used as scanning electrodes, wherein the driver circuit sequentially applies the touch panel scanning voltage to the common electrodes of each of the M divided blocks, wherein the detector circuit determines; in a normal touch detection process, a touch event by detecting the touch signal of the plurality of detection electrodes when the touch panel scanning voltage is applied to the common electrodes of each of the M divided blocks; and in a ghost touch detection process, a ghost touch event by detecting the touch signal of the plurality of detection electrodes without applying the touch panel scanning voltage to the M divided blocks, and wherein a threshold value for determining the touch event of the normal touch detection process is different from that for determining the ghost touch event of the ghost touch detection process. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A display device comprising:
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a display panel having a plurality of pixels arranged in a matrix, a plurality of detection electrodes, and common electrodes arranged along the respective pixels and divided into M blocks when M is an integral number of 2 or more (M≧
2);a driver circuit applying a common voltage and a touch panel scanning voltage to the common electrodes of each of the M divided blocks; and a detector circuit detecting a touch signal of the plurality of detection electrodes, wherein the common electrodes of each of the M divided blocks are shared with the respective pixels of a plurality of continuous display lines, and are also used as scanning electrodes, wherein the driver circuit sequentially applies the touch panel scanning voltage to the common electrodes of each of the M divided blocks, and wherein the detector circuit includes; a first unit that determines a touch detected by the touch signal of the plurality of detection electrodes when the touch panel scanning voltage is applied to the common electrodes of each of the M divided blocks; a second unit that determines a noise detected by the touch signal of the plurality of detection electrodes, assuming that an (M+1)th common electrode is present for the common electrodes of each of the M divided blocks, and assuming that a touch panel scanning voltage synchronous with the touch panel scanning voltage applied to the common electrodes of each of the M divided blocks is applied to the (M+1)th common electrode; and a third unit that determines a ghost touch when the noise is determined by the second unit, wherein a first touch position detecting process is executed when the noise is not determined by the second unit, wherein when the noise is determined by the second unit, if the ghost touch is determined by the third unit, a second touch position detecting process is executed, and wherein when the noise is detected by the second unit, if the ghost touch is not determined by the third unit, the second touch position detecting process is not executed. - View Dependent Claims (9, 10, 11, 12)
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Specification