Touch panel, display device, and electronic device
View Patent ↗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.
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, 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.
2. A display device comprising the touch panel according to claim 1 , wherein each of the plurality of pixels includes a display element.
3. A display device according to claim 2 , wherein the display element comprises a thin film transistor.
4. An electronic device wherein the touch panel according to claim 1 is used in a display portion.
5. An electronic device according to claim 4 , the electronic device is one of a monitor, a portable game machine, and a mobile phone.
6. 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 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.
7. A display device comprising the touch panel according to claim 6 , wherein each of the plurality of pixels includes a display element.
8. A display device according to claim 7 , wherein the display element comprises a thin film transistor.
9. An electronic device wherein the touch panel according to claim 6 is used in a display portion.
10. An electronic device according to claim 9 , the electronic device is one of a monitor, a portable game machine, and a mobile phone.
11. 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 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.
12. A display device comprising the touch panel according to claim 11 , wherein each of the plurality of pixels includes a display element.
13. A display device according to claim 12 , wherein the display element comprises a thin film transistor.
14. An electronic device wherein the touch panel according to claim 11 is used in a display portion.
15. An electronic device according to claim 14 , the electronic device is one of a monitor, a portable game machine, and a mobile phone.
16. A touch panel comprising:
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.
17. A display device comprising the touch panel according to claim 16 , wherein each of the plurality of pixels includes a display element.
18. A display device according to claim 17 , wherein the display element comprises a thin film transistor.
19. An electronic device wherein the touch panel according to claim 16 is used in a display portion.
20. An electronic device according to claim 19 , the electronic device is one of a monitor, a portable game machine, and a mobile phone.