# US 2019/0318698 A1 · Display device including optical sensor and driving method thereof

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- Number: US 2019/0318698 A1
- Document ID: US20190318698A1
- Status: Published application
- Kind: A1
- Application number: 16/454,357
- Filed: 2019-06-27
- Published: 2019-10-17
- Earliest claimed: 2009-12-18
- Assignees: Semiconductor Energy Laboratory Co., Ltd.
- Applicants: Semiconductor Energy Laboratory Co., Ltd.
- Inventors: Shunpei YAMAZAKI
- Web page: https://patentgrep.com/patent/US20190318698A1

## CPC

- G09G 3/3413: {Details of control of colour illumination sources}
- G02F 1/13318: {Circuits comprising a photodetector}
- G09G 3/2003: {Display of colours (specific for liquid crystal displays G09G3/3607)}
- G09G 3/3648: {using an active matrix (G09G3/367 - G09G3/3696 take precedence)}
- G09G 3/3696: {Generation of voltages supplied to electrode drivers}
- G02F 1/13312: {Circuits comprising photodetectors for purposes other than feedback}
- G02F 1/1368: in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)}
- G09G 3/3225: using an active matrix
- G09G 2300/0426: Layout of electrodes and connections
- G09G 2310/0202: Addressing of scan or signal lines
- G09G 2310/0235: Field-sequential colour display
- G09G 2320/0295: by monitoring each display pixel
- G09G 2320/0626: for control of overall brightness
- G09G 2320/0666: for control of colour parameters, e.g. colour temperature
- G09G 2330/021: Power management, e.g. power saving
- G09G 2360/14: Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G 2360/144: the light being ambient light
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

An object is to provide a display device with low power consumption and good display quality. A first substrate is provided with a terminal portion, a pixel electrode, a switching transistor including an oxide semiconductor, a first optical sensor having high optical sensitivity to visible light, and a second optical sensor having optical sensitivity to infrared light and having lower optical sensitivity to visible light than the first optical sensor. The illuminance or color temperature around a display device is detected using the first and second optical sensors, and the luminance or color tone of a display image is adjusted. A second substrate is provided so as to face the first substrate, and is provided with a counter electrode. In a period for displaying a still image, the switching transistor is turned off so that the counter electrode is brought into a floating state.

## Claims

### Claim 1

(canceled)

### Claim 2

A display device comprising:
a first substrate, wherein a terminal portion, a switching transistor, a first optical sensor, a second optical sensor, an optical sensor control circuit, a pixel portion and a driver circuit are provided on the first substrate,
a second substrate provided with a counter electrode, the second substrate facing with the first substrate,
wherein the first optical sensor includes a first photoelectric conversion element including an amorphous semiconductor, and a first amplifier circuit,
wherein the second optical sensor includes a second photoelectric conversion element including a polycrystalline semiconductor, and a second amplifier circuit,
wherein the counter electrode is electrically connected to the terminal portion through the switching transistor,
wherein the first optical sensor detects visible light, and
wherein the second optical sensor detects visible light and infrared light.

### Claim 3 (depends on 2)

The display device according to claim 2,
wherein the first optical sensor has a maximum sensitivity at a wavelength of approximately 0.6 μm, and
wherein the second optical sensor has a maximum sensitivity at a wavelength of approximately 0.7 μm.

### Claim 4 (depends on 2)

The display device according to claim 2,
wherein the first photoelectric conversion element includes amorphous silicon, and
wherein the second photoelectric conversion element includes polycrystalline silicon or microcrystalline silicon.

### Claim 5 (depends on 2)

The display device according to claim 2,
wherein at least one of the first amplifier circuit and the second amplifier circuit have a transistor including an oxide semiconductor.

### Claim 6 (depends on 2)

The display device according to claim 2,
wherein the optical sensor control circuit comprises an optical sensor reading circuit and an optical sensor driver circuit.

### Claim 7 (depends on 6)

The display device according to claim 6,
wherein the optical sensor control circuit comprises an optical sensor output signal line and optical sensor reference signal line.

### Claim 8 (depends on 6)

The display device according to claim 6,
wherein the optical sensor driver circuit is configured to perform reset operation and selecting operation on the first optical sensor and the second optical sensor in the pixel portion, and
wherein the optical sensor reading circuit is configure to take out an output signal of the first optical sensor and the second optical sensor.

### Claim 9

A display device comprising:
a first substrate, wherein a terminal portion, a switching transistor, a first optical sensor, a second optical sensor, an optical sensor control circuit, a pixel portion and a driver circuit are provided on the first substrate,
a second substrate provided with a counter electrode, the second substrate facing with the first substrate,
wherein the first optical sensor includes a first photoelectric conversion element including an amorphous semiconductor, and a first amplifier circuit,
wherein the second optical sensor includes a second photoelectric conversion element including a polycrystalline semiconductor, and a second amplifier circuit,
wherein the counter electrode is electrically connected to the terminal portion through the switching transistor,
wherein the first optical sensor detects visible light and has a maximum sensitivity at a wavelength of approximately 0.6 μm, and
wherein the second optical sensor detects visible light and infrared light and has a maximum sensitivity at a wavelength of approximately 0.7 μm.

### Claim 10 (depends on 9)

The display device according to claim 9,
wherein the first photoelectric conversion element includes amorphous silicon, and
wherein the second photoelectric conversion element includes polycrystalline silicon or microcrystalline silicon.

### Claim 11 (depends on 9)

The display device according to claim 9,
wherein at least one of the first amplifier circuit and the second amplifier circuit have a transistor including an oxide semiconductor.

### Claim 12 (depends on 9)

The display device according to claim 9,
wherein the optical sensor control circuit comprises an optical sensor reading circuit and an optical sensor driver circuit.

### Claim 13 (depends on 12)

The display device according to claim 12,
wherein the optical sensor control circuit comprises an optical sensor output signal line and optical sensor reference signal line.

### Claim 14 (depends on 12)

The display device according to claim 12,
wherein the optical sensor driver circuit is configured to perform reset operation and selecting operation on the first optical sensor and the second optical sensor in the pixel portion, and
wherein the optical sensor reading circuit is configured to take out an output signal of the first optical sensor and the second optical sensor.