Display device
First Claim
Patent Images
1. A display device comprising:
- a first substrate having a pixel electrode and a counter electrode;
a second substrate having a plurality of detection electrodes of a touch panel;
a liquid crystal interposed between the first substrate and the second substrate;
a drive circuit for supplying a counter voltage and a touch panel scanning voltage to the counter electrode; and
a detection circuit for detecting presence or absence of a touch based on a current flowing through the detection electrodes, wherein;
the counter electrode is divided into m blocks, where m is set to an integer equal to or larger than 2 (m≧
2);
the m divided blocks of the counter electrode are commonly provided to pixels on a plurality of consecutive display lines;
the m divided blocks of the counter electrode serve as scanning electrodes of the touch panel;
the drive circuit sequentially supplies the touch panel scanning voltage to the m divided blocks of the counter electrode;
the detection circuit is configured to;
(a) detect presence or absence of noise or water droplet adhesion based on the current flowing through the detection electrodes upon supply of the touch panel scanning voltage to the m divided blocks of the counter electrode; and
(b) distinguish between noise and water droplet based on the current flowing through the detection electrodes on the assumption that a (m+1)th counter electrode exists in addition to the in divided blocks of the counter electrode, and the touch panel scanning voltage is supplied to the (m+1)th counter electrode, which is in synchronization with the touch panel scanning voltage supplied to the m divided blocks of the counter electrode.
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Abstract
A display device is configured to (a) detect presence or absence of noise or water droplet adhesion based on current flowing through a plurality of detection electrodes upon supply of a touch panel scanning voltage to m divided blocks of the counter electrode, and (b) distinguish between noise and water droplet based on the current flowing through the detection electrodes on the assumption that a (m+1)th counter electrodes exists in addition to the m divided blocks of the counter electrode, and the touch panel scanning voltage is supplied to the (m+1)th counter electrode, which is in synchronization with the touch panel scanning voltage supplied to the m divided blocks of the counter electrode.
7 Citations
18 Claims
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1. A display device comprising:
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a first substrate having a pixel electrode and a counter electrode; a second substrate having a plurality of detection electrodes of a touch panel; a liquid crystal interposed between the first substrate and the second substrate; a drive circuit for supplying a counter voltage and a touch panel scanning voltage to the counter electrode; and a detection circuit for detecting presence or absence of a touch based on a current flowing through the detection electrodes, wherein; the counter electrode is divided into m blocks, where m is set to an integer equal to or larger than 2 (m≧
2);the m divided blocks of the counter electrode are commonly provided to pixels on a plurality of consecutive display lines; the m divided blocks of the counter electrode serve as scanning electrodes of the touch panel; the drive circuit sequentially supplies the touch panel scanning voltage to the m divided blocks of the counter electrode; the detection circuit is configured to; (a) detect presence or absence of noise or water droplet adhesion based on the current flowing through the detection electrodes upon supply of the touch panel scanning voltage to the m divided blocks of the counter electrode; and (b) distinguish between noise and water droplet based on the current flowing through the detection electrodes on the assumption that a (m+1)th counter electrode exists in addition to the in divided blocks of the counter electrode, and the touch panel scanning voltage is supplied to the (m+1)th counter electrode, which is in synchronization with the touch panel scanning voltage supplied to the m divided blocks of the counter electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A display device comprising:
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a first substrate having a pixel electrode and a counter electrode; a second substrate having a plurality of detection electrodes; a liquid crystal interposed between the first substrate and the second electrode; a drive circuit for supplying a counter voltage and a scanning voltage; and a detection circuit for making a touch determination based on a signal generated in the detection electrodes, wherein; the counter electrode is divided into m blocks, where m is set to an integer equal to or larger than 2 (m≧
2);the counter electrode is commonly provided to the pixel electrodes; the drive circuit supplies the scanning voltage to the counter electrode in a detection period; the detection circuit is configured to detect a signal generated in the detection electrode in the detection period at m cycles and a subsequent noise detection period, the touch determination is made based on a first threshold value and a second threshold value, which are selectively used in accordance with a detection result in the noise detection period, the detection circuit includes a plurality of integration circuits provided for the respective detection electrodes, and an AD converter for converting output voltages of the integration circuits into digital data, and the respective integration circuits integrate the voltage generated by current flowing through the detection electrodes in the detection period and a noise detection period, the AD converter outputs digital data having a least significant value and a most significant value, the integration circuit has a first operating point in the detection period, and a value of the digital data at the first operating point is closer to the least significant value than an intermediate value between the least significant value and the most significant value. - View Dependent Claims (16, 17, 18)
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Specification