ELECTRONIC DEVICE AND ELECTRONIC SYSTEM

• US 20110175833A1
• Filed: 01/14/2011
• Published: 07/21/2011
• Est. Priority Date: 01/20/2010
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Kurokawa, Yoshiyuki, Ikeda, Takayuki, Tamura, Hikaru, Yamazaki, Shunpei
• Granted Patent: US 9,703,423 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: H01L 27/14609 Pixel-elements with integrated switching, control, storage or amplification elements scanning details of imagers (circuitry of solid-state image sensors H04N25/00); circuitry of imagers H04N25/70
• CPC Class Codes: H01L 27/14643 Photodiode arrays; MOS imagers
• CPC Class Codes: H01L 27/14692 Thin film technologies, e.g. amorphous, poly, micro- or nanocrystalline silicon

Abstract

One object is to provide a new electronic device which is configured so that a user can read data regardless of a location, input data by directly touching a keyboard displayed on a screen or indirectly touching the keyboard with a stylus pen or the like, and use the input data. A first transistor electrically connected to a reflective electrode and a photo sensor are included over one substrate. A touch-input button displayed on a first screen region of the display portion is displayed as a still image, and a video signal is output so that a moving image is displayed on a second screen region of the display portion. A video signal processing portion supplying different signals between the case where a still image is displayed on the display portion and the case where a moving image is displayed on the display portion is included.

Claims

1. Au electronic device comprising:

a first transistor electrically connected to a reflective electrode and a photo sensor over a substrate,

wherein the photo sensor comprises a photodiode, a second transistor comprising a gate electrically connected to the photodiode, and a third transistor which comprises an oxide semiconductor layer,

wherein one of a source and a drain of the second transistor is electrically connected to a photo sensor reference signal line,

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

wherein the other of the source and the drain of the third transistor is electrically connected to a photo sensor output signal line, and

wherein the oxide semiconductor layer of the third transistor overlaps with the reflective electrode.

2. The electronic device according to claim 1,

wherein an oxide semiconductor layer of the second transistor overlaps with a reading signal line with a gate insulating layer provided therebetween, and

wherein the reading signal line overlaps with the reflective electrode.

3. An electronic device comprising:

a first transistor electrically connected to a first reflective electrode, a second transistor electrically connected to a second reflective electrode, and a photo sensor over a substrate,

wherein the photo sensor comprises a photodiode, a third transistor comprising a gate electrically connected to the photodiode, and a fourth transistor,

wherein one of a source and a drain of the third transistor is electrically connected to a photo sensor reference signal line,

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

wherein the other of the source and the drain of the fourth transistor is electrically connected to a photo sensor output signal line,

wherein an oxide semiconductor layer of the fourth transistor overlaps with the first reflective electrode, and

wherein the photo sensor reference signal line overlaps with the second reflective electrode.

4. The electronic device according to claim 3,

wherein an oxide semiconductor layer of the third transistor overlaps with a reading signal line with a gate insulating layer provided therebetween, and

wherein the reading signal line overlaps with the first reflective electrode.

5. The electronic device according to claim 3 or claim 4,

wherein one of the source and the drain of the fourth transistor overlaps with the first reflective electrode, and

wherein the other of the source and the drain of the fourth transistor overlaps with the second reflective electrode.

6. An electronic system comprising:

a photo sensor; and

a display portion performing display by processing input data obtained from the photo sensor to a video signal,

wherein a touch-input button displayed on a first screen region of the display portion is displayed as a still image, and

wherein the video signal is output so that a moving image is displayed on a second screen region of the display portion.

7. The electronic system according to claim 6, further comprising a video signal processing portion switching the first screen region of the display portion to a screen region where touch input is performed or a screen region where the video signal is output to perform display.

8. The electronic system according to claim 6, further comprising a video signal processing portion supplying different signals between the case where a still image is displayed on the display portion and the case where a moving image is displayed on the display portion.