TOUCH PANEL

• US 20100225615A1
• Filed: 02/17/2010
• Published: 09/09/2010
• Est. Priority Date: 03/09/2009
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: KUROKAWA, Yoshiyuki
• Granted Patent: US 9,122,348 B2
• Time in Patent Office: Days
• US Class Current: 345/175
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: H03M 1/004 Reconfigurable analogue/digital or digital/analogue converters H03M1/02 takes precedence
• CPC Class Codes: H03M 1/1215 using time-division multiplexing
• CPC Class Codes: H03M 1/46 with digital/analogue converter for supplying reference values to converter

Abstract

An embodiment of the present invention provides a touch panel that enable data sensing with multi-gray scale and an electronic device. At least a first pixel including a first photosensor portion detecting light with a first color, a second pixel including a second photosensor portion detecting light with a second color, a first A/D converter performing A/D conversion on an output signal of the first photosensor portion, and a second A/D converter performing A/D conversion on an output signal of the second photosensor portion are included. The voltage resolution of the first A/D converter and the voltage resolution of the second A/D converter are different.

Claims

1. A touch panel comprising:

a first pixel including a first photosensor portion detecting light with a first color;

a second pixel including a second photosensor portion detecting light with a second color;

a first A/D converter performing A/D conversion on an output signal of the first photosensor portion; and

a second A/D converter performing A/D conversion on an output signal of the second photosensor portion,

wherein voltage resolution of the first A/D converter and voltage resolution of the second A/D converter are different.

2. The touch panel according to claim 1, wherein the first color is a color selected from red, blue, and green, and

wherein the second color is a color selected from red, blue, and green and different from the first color.

3. The touch panel according to claim 1, wherein the first photosensor portion and the second photosensor portion each include a transistor and a photodiode.

4. The touch panel according to claim 1, wherein the first photosensor portion and the second photosensor portion each include a first transistor, a second transistor, and a photodiode,

wherein a gate of the first transistor is electrically connected to one electrode of the photodiode,

wherein one of a source and a drain of the first transistor is electrically connected to a first wiring,

wherein the other one of the source and the drain of the first transistor is electrically connected to one of a source and a drain of the second transistor,

wherein a gate of the second transistor is electrically connected to a second wiring,

wherein the other one of the source and the drain of the second transistor is electrically connected to a third wiring, and

wherein the other electrode of the photodiode is electrically connected to a fourth wiring.

5. The touch panel according to claim 1, wherein the first A/D converter and the second A/D converter each include a D/A converter and a comparator.

6. A touch panel comprising:

a first pixel including a first photosensor portion detecting light with a first color and a first display element portion;

a second pixel including a second photosensor portion detecting light with a second color and a second display element portion;

a first A/D converter performing A/D conversion on an output signal of the first photosensor portion; and

a second A/D converter performing A/D conversion on an output signal of the second photosensor portion,

wherein voltage resolution of the first A/D converter and voltage resolution of the second A/D converter are different.

7. The touch panel according to claim 6, wherein the first color is a color selected from red, blue, and green, and

wherein the second color is a color selected from red, blue, and green and different from the first color.

8. The touch panel according to claim 6, wherein the first photosensor portion and the second photosensor portion each include a transistor and a photodiode.

9. The touch panel according to claim 6, wherein the first photosensor portion and the second photosensor portion each include a first transistor, a second transistor, and a photodiode,

wherein a gate of the first transistor is electrically connected to one electrode of the photodiode,

wherein one of a source and a drain of the first transistor is electrically connected to a first wiring,

wherein the other one of the source and the drain of the first transistor is electrically connected to one of a source and a drain of the second transistor,

wherein a gate of the second transistor is electrically connected to a second wiring,

wherein the other one of the source and the drain of the second transistor is electrically connected to a third wiring,

wherein the other electrode of the photodiode is electrically connected to a fourth wiring.

10. The touch panel according to claim 6, wherein the first A/D converter and the second A/D converter each include a D/A converter and a comparator.

11. The touch panel according to claim 6, wherein the first display element portion and the second display element portion each include a transistor and a light emitting element.

12. The touch panel according to claim 6, wherein the first display element portion and the second display element portion each include a transistor and a liquid crystal element.

13. The touch panel according to claim 6, wherein the first display element portion and the second display element portion each include a transistor and a liquid crystal element,

wherein a gate of the transistor is electrically connected to a first wiring,

wherein one of a source and a drain of the transistor is electrically connected to a second wiring, and

wherein the other one of the source and the drain of the transistor is electrically connected to the liquid crystal element.