Touch panel, display device, and electronic device
First Claim
Patent Images
1. A touch panel comprising:
- a pixel circuit including a plurality of pixels, each pixel including a photo sensor; and
a photo sensor signal line reading circuit for taking an output signal of the photo sensor, the photo sensor signal line reading circuit including a plurality of A/D converter circuits and an ADC control circuit,wherein the plurality of A/D converter circuits are provided at every one column or at every plurality of columns of the plurality of pixels,wherein the ADC control circuit includes a shift register configured to sequentially supply ADC enable signals to the plurality of A/D converter circuits, andwherein each of the plurality of A/D converter circuits is connected to the ADC control circuit via an ADC enable signal line, a plurality of ADC reset signal lines, a plurality of ADC set signal lines, and an ADC output signal line.
1 Assignment
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Accused Products
Abstract
It is an object to provide a touch panel with high precision, high-speed operation, and low power consumption, which is caused by reduction of power consumption in an A/D converter circuit is reduced. In the touch panel in which a photo sensor is included in a pixel and an A/D converter circuit is provided every one column or a plurality of columns of the pixels, a control signal of the A/D converter circuit is sequentially supplied by a shift register included in an ADC (A/D converter circuit) control circuit, and respective periods when the plurality of A/D converter circuits operates are not overlap with each other. Accordingly, the number of A/D converter circuits which operate at the same time is decreased, and instantaneous power consumption in the A/D converter circuit is decreased.
8 Citations
20 Claims
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1. A touch panel comprising:
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a pixel circuit including a plurality of pixels, each pixel including a photo sensor; and a photo sensor signal line reading circuit for taking an output signal of the photo sensor, the photo sensor signal line reading circuit including a plurality of A/D converter circuits and an ADC control circuit, wherein the plurality of A/D converter circuits are provided at every one column or at every plurality of columns of the plurality of pixels, wherein the ADC control circuit includes a shift register configured to sequentially supply ADC enable signals to the plurality of A/D converter circuits, and wherein each of the plurality of A/D converter circuits is connected to the ADC control circuit via an ADC enable signal line, a plurality of ADC reset signal lines, a plurality of ADC set signal lines, and an ADC output signal line. - View Dependent Claims (2, 3, 4, 5)
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6. A touch panel comprising:
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a pixel circuit including a plurality of pixels, each pixel including a photo sensor; and a photo sensor signal line reading circuit for taking an output signal of the photo sensor, the photo sensor signal line reading circuit including a plurality of A/D converter circuits and an ADC control circuit, wherein the plurality of A/D converter circuits are provided at every one column or at every plurality of columns of the plurality of pixels, wherein each of the plurality of A/D converter circuits is connected to the ADC control circuit via an ADC enable signal line, a plurality of ADC reset signal lines, a plurality of ADC set signal lines, and an ADC output signal line, and wherein the plurality of A/D converter circuits are sequentially operated in time series, not at the same time. - View Dependent Claims (7, 8, 9, 10)
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11. A touch panel comprising:
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a pixel circuit including a plurality of pixels, each pixel including a photo sensor; and a photo sensor signal line reading circuit for taking an output signal of the photo sensor, the photo sensor signal line reading circuit including a plurality of A/D converter circuits and an ADC control circuit, wherein each of the plurality of A/D converter circuits is connected to the ADC control circuit via an ADC enable signal line, a plurality of ADC reset signal lines, a plurality of ADC set signal lines, and an ADC output signal line, wherein the plurality of A/D converter circuits are provided at every one column or at every plurality of columns of the plurality of pixels, wherein each of the plurality of A/D converter circuits has a comparator circuit, and wherein the plurality of A/D converter circuits are sequentially operated in time series and periods when the comparator circuits of the plurality of A/D converter circuits are operated do not overlap with each other. - View Dependent Claims (12, 13, 14, 15)
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16. A touch panel comprising:
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a pixel circuit including a plurality of pixels over a substrate, each pixel including a photo sensor; and a photo sensor signal line reading circuit for taking an output signal of the photo sensor over the substrate, the photo sensor signal line reading circuit including a plurality of A/D converter circuits and an ADC control circuit, wherein the plurality of A/D converter circuits are provided at every one column or at every plurality of columns of the plurality of pixels, wherein the ADC control circuit includes a shift register configured to sequentially supply ADC enable signals to the plurality of A/D converter circuits, wherein each of the plurality of A/D converter circuits has a comparator circuit, and wherein periods when the comparator circuits of the plurality of A/D converter circuits are operated do not overlap with each other. - View Dependent Claims (17, 18, 19, 20)
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Specification
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Current AssigneeSemiconductor Energy Laboratory Co., Ltd.
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Original AssigneeSemiconductor Energy Laboratory Co., Ltd.
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InventorsKurokawa, Yoshiyuki
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Primary Examiner(s)GIESY, ADAM
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Application NumberUS12/639,624Publication NumberTime in Patent Office1,980 DaysField of SearchNoneUS Class Current345/175CPC Class CodesG02F 1/13312 Circuits comprising photode...G02F 1/13338 Input devices, e.g. touch p...G06F 3/0412 Digitisers structurally int...G06F 3/042 by opto-electronic meansG09G 2310/0235 Field-sequential colour dis...G09G 2320/0626 for control of overall brig...G09G 2360/144 the light being ambient lightG09G 3/3406 Control of illumination sou...
