Semiconductor device and electronic device
First Claim
1. A semiconductor device comprising:
- a touch panel controller connected with a touch panel having a plurality of drive electrodes, a plurality of detection electrodes, and a plurality of capacitance components formed at intersections of the drive and detection electrodes,wherein the touch panel controller comprisesa plurality of drive terminals connected with the plurality of drive electrodes;
a drive circuit operable to output a drive pulse from the plurality of drive terminals;
a plurality of detection terminals connected with the plurality of detection electrodes;
a detection circuit operable to create detection data by accumulating signals input through each detection terminal in synchronization with change in the drive pulse; and
a control circuit operable to control an action of detecting a touch and no touch by use of the drive circuit and the detection circuit, andwherein the detection circuit has a two-edge detection mode for creating detection data by accumulating, in terms of absolute value components, signals which are input through each detection terminal in synchronization with rising and falling changes of the drive pulse respectively and alternately change in polarity.
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Accused Products
Abstract
The touch panel controller is connected with a touch panel having a plurality of drive electrodes, a plurality of detection electrodes, and a plurality of capacitance components formed at intersections of the drive and detection electrodes. A two-edge detection mode is adopted for the touch panel controller, in which signals arising on each detection electrode in synchronization with rising and falling edges of a drive pulse output to the drive electrodes, and alternately changing in polarity are accumulated in the integration circuit in terms of absolute value components. The integration circuit switches the connection of the integration capacitance between an input and an output before the drive pulse edge changing. The touch panel controller contributes to the shortening of the time for touch detection by the touch panel and the increase of the accuracy of touch detection.
7 Citations
26 Claims
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1. A semiconductor device comprising:
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a touch panel controller connected with a touch panel having a plurality of drive electrodes, a plurality of detection electrodes, and a plurality of capacitance components formed at intersections of the drive and detection electrodes, wherein the touch panel controller comprises a plurality of drive terminals connected with the plurality of drive electrodes; a drive circuit operable to output a drive pulse from the plurality of drive terminals; a plurality of detection terminals connected with the plurality of detection electrodes; a detection circuit operable to create detection data by accumulating signals input through each detection terminal in synchronization with change in the drive pulse; and a control circuit operable to control an action of detecting a touch and no touch by use of the drive circuit and the detection circuit, and wherein the detection circuit has a two-edge detection mode for creating detection data by accumulating, in terms of absolute value components, signals which are input through each detection terminal in synchronization with rising and falling changes of the drive pulse respectively and alternately change in polarity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electronic device comprising:
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a touch panel having a plurality of drive electrodes, a plurality of detection electrodes, and a plurality of capacitance components formed at intersections of the drive and detection electrodes; a touch panel controller connected with the touch panel; and a processor connected with the touch panel controller, wherein the touch panel controller comprises a plurality of drive terminals connected with the plurality of drive electrodes; a drive circuit operable to output a drive pulse from the plurality of drive terminals; a plurality of detection terminals connected with the plurality of detection electrodes; a detection circuit operable to create detection data by accumulating signals input through each detection terminal in synchronization with change in the drive pulse; and a control circuit operable to control the action of detecting a touch and no touch by use of the drive circuit and the detection circuit, wherein the detection circuit has a two-edge detection mode for creating detection data by accumulating, in terms of absolute value components, signals which are input through each detection terminal in synchronization with rising and falling changes of the drive pulse respectively and alternately change in polarity, and wherein the processor calculates, based on the detection data, a coordinate point of a position on the touch panel where the touch panel is touched. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification