# US 10,503,040 B2 · Display device, input/output device, and semiconductor device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,503,040 B2
- Document ID: US10503040B2
- Status: Granted
- Kind: B2
- Application number: 15/658,447
- Filed: 2017-07-25
- Published: 2018-02-01
- Granted: 2019-12-10
- Earliest claimed: 2016-07-29
- Assignees: Semiconductor Energy Laboratory Co., Ltd.
- Applicants: Semiconductor Energy Laboratory Co., Ltd.
- Inventors: Shunpei Yamazaki; Hajime Kimura
- Web page: https://patentgrep.com/patent/US10503040B2

## CPC

- G02F 1/133514: {Colour filters}
- G02B 26/04: by periodically varying the intensity of light, e.g. using choppers (shutters, diaphragms for cameras G03B9/00; devices for eliminating or reducing the effect of flicker in projection systems G03B21/40)
- G02F 1/1333: Constructional arrangements; {Manufacturing methods}(G02F1/135, G02F1/136 take precedence)
- G02F 1/133553: {Reflecting elements (associated to illuminating devices G02F1/133605)}
- G02F 1/167: by electrophoresis
- G02F 1/1677: Structural association of cells with optical devices, e.g. reflectors or illuminating devices
- G02F 1/16757: Microcapsules
- G02F 1/1681: having two or more microcells partitioned by walls, e.g. of microcup type
- G02F 2001/1678: {characterised by the composition or particle type}
- G02F 2201/44: Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers
- G02F 2203/02: reflective
- H10K 59/50: OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
- 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
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES

## Abstract

A display device with high visibility or low power consumption is provided. The display device includes a pixel. The pixel includes a self-luminous display element and a reflective display element. The self-luminous display element is provided closer to the display surface than the reflective display element. The reflective display element includes a unit for adjusting the amount of light which changes its arrangement on the basis of electric power supplied from an electrode and blocks light with the unit for adjusting the amount of light to change the intensity of reflected light. Electrophoretic particles, a shutter, a film which reflects part of light, a film which reflects light, or the like can be used as the unit for adjusting the amount of light.

## Claims

### Claim 1

A display device comprising a plurality of pixels, each pixel comprising:
a reflective display element;
a light-emitting element over the reflective display element;
a first transistor electrically connected to the reflective display element; and
a second transistor electrically connected to the light-emitting element,
wherein the light-emitting element is provided closer to a display surface of the display device than the reflective display element,
wherein a part of the first transistor is overlapped with a part of the second transistor,
wherein the reflective display element comprises a unit configured to adjust an amount of light, the unit changing its arrangement based on electric power supplied from an electrode, and
wherein the reflective display element is configured to change an intensity of reflected light by partially blocking the light with the unit.

### Claim 2 (depends on 1)

The display device according to claim 1,
wherein the plurality of pixels includes at least a first pixel, a second pixel, and a third pixel,
wherein the first pixel comprises an electrophoretic particle colored in a first color,
wherein the second pixel comprises an electrophoretic particle colored in a second color,
wherein the third pixel comprises an electrophoretic particle colored in a third color,
wherein the second color is different from the first color, and
wherein the third color is different from the first color and the second color.

### Claim 3 (depends on 1)

The display device according to claim 1,
wherein the plurality of pixels includes at least a first pixel, a second pixel, and a third pixel,
wherein the first pixel comprises a solution colored in a first color,
wherein the second pixel comprises a solution colored in a second color,
wherein the third pixel comprises a solution colored in a third color,
wherein the second color is different from the first color, and
wherein the third color is different from the first color and the second color.

### Claim 4 (depends on 1)

The display device according to claim 1,
wherein the unit comprises:
a light-reflective layer; and
a semi-transmissive layer over the light-reflective layer,
wherein a distance between the semi-transmissive layer and the light-reflective layer is changed by an electrical or magnetic effect, and
wherein the semi-transmissive layer comprises a region between the light-reflective layer and the light-emitting element.

### Claim 5 (depends on 1)

The display device according to claim 1,
wherein the light-emitting element is capable of transmitting visible light, and
wherein the reflective display element is configured to reflect light that has passed through the light-emitting element.

### Claim 6 (depends on 1)

The display device according to claim 1,
wherein the unit comprises:
a light-reflective layer; and
a shutter over the light-reflective layer, and
wherein the shutter and the light-reflective layer overlap with each other.

### Claim 7 (depends on 6)

The display device according to claim 6,
wherein the light-emitting element is capable of transmitting visible light, and
wherein the light-reflective layer is configured to reflect light that has passed through the light-emitting element.

### Claim 8 (depends on 1)

The display device according to claim 1, further comprising:
at least one coloring film,
wherein the coloring film comprises at least a region provided between the reflective display element and the light-emitting element.

### Claim 9 (depends on 1)

The display device according to claim 1, further comprising:
at least one coloring film,
wherein the light-emitting element comprises at least a region provided between the coloring film and the reflective display element.

### Claim 10 (depends on 1)

A semiconductor device comprising:
at least one of a keyboard, a hardware button, a pointing device, a touch sensor, an illuminance sensor, an imaging device, an audio input device, a viewpoint input device, and a pose detection device, and
the display device according to claim 1.

### Claim 11 (depends on 1)

The display device according to claim 1, wherein the light-emitting element includes an organic light-emitting material.

### Claim 12 (depends on 1)

The display device according to claim 1,
wherein the unit includes a plurality of microcapsules, and
wherein each of the plurality of microcapsules comprises a plurality of electrophoretic particles.

### Claim 13

A display device comprising a plurality of pixels, each pixel comprising:
a reflective display element;
a light-emitting element over the reflective display element;
a first transistor electrically connected to the reflective display element; and
a second transistor electrically connected to the light-emitting element,
wherein the light-emitting element is provided closer to a display surface of the display device than the reflective display element,
wherein the first transistor and the second transistor are provided between the reflective display element and the light-emitting element,
wherein the reflective display element comprises a unit configured to adjust an amount of light, the unit changing its arrangement based on electric power supplied from an electrode, and
wherein the reflective display element is configured to change an intensity of reflected light by partially blocking the light with the unit.

### Claim 14

A display device comprising a plurality of pixels, each pixel comprising:
a reflective display element;
a light-emitting element overlapping with the reflective display element;
a first transistor electrically connected to the reflective display element; and
a second transistor electrically connected to the light-emitting element,
wherein the light-emitting element is provided closer to a display surface of the display device than the reflective display element,
wherein the first transistor and the second transistor are provided between the reflective display element and the light-emitting element,
wherein the reflective display element comprises:
a light-reflective layer; and
a layer configured to adjust an amount of light, the layer being provided over the light-reflective layer, and
wherein the reflective display element is configured to change an intensity of light reflected by the light-reflective layer using the layer.

### Claim 15 (depends on 14)

The display device according to claim 14,
wherein the layer includes a plurality of microcapsules, and
wherein each of the plurality of microcapsules comprises a plurality of electrophoretic particles.

### Claim 16 (depends on 14)

The display device according to claim 14,
wherein the plurality of pixels includes at least a first pixel, a second pixel, and a third pixel,
wherein the first pixel comprises an electrophoretic particle colored in a first color,
wherein the second pixel comprises an electrophoretic particle colored in a second color,
wherein the third pixel comprises an electrophoretic particle colored in a third color,
wherein the second color is different from the first color, and
wherein the third color is different from the first color and the second color.

### Claim 17 (depends on 14)

The display device according to claim 14,
wherein the plurality of pixels includes at least a first pixel, a second pixel, and a third pixel,
wherein the first pixel comprises a solution colored in a first color,
wherein the second pixel comprises a solution colored in a second color,
wherein the third pixel comprises a solution colored in a third color,
wherein the second color is different from the first color, and
wherein the third color is different from the first color and the second color.

### Claim 18 (depends on 14)

The display device according to claim 14, wherein the layer comprises a semi-transmissive layer over the light-reflective layer,
wherein a distance between the semi-transmissive layer and the light-reflective layer is changed by an electrical or magnetic effect, and
wherein the semi-transmissive layer comprises a region between the light-reflective layer and the light-emitting element.

### Claim 19 (depends on 14)

The display device according to claim 14,
wherein the light-emitting element is capable of transmitting visible light, and
wherein the light-reflective layer is configured to reflect light that has passed through the light-emitting element.

### Claim 20 (depends on 14)

The display device according to claim 14,
wherein the layer comprises a shutter, and
wherein the shutter and the light-reflective layer overlap with each other.

### Claim 21 (depends on 14)

The display device according to claim 14, further comprising:
at least one coloring film,
wherein the coloring film comprises at least a region provided between the reflective display element and the light-emitting element.

### Claim 22 (depends on 14)

The display device according to claim 14, further comprising:
at least one coloring film,
wherein the light-emitting element comprises at least a region provided between the coloring film and the reflective display element.

### Claim 23 (depends on 14)

The display device according to claim 14, wherein the light-emitting element includes an organic light-emitting material.

### Claim 24 (depends on 14)

A semiconductor device comprising:
at least one of a keyboard, a hardware button, a pointing device, a touch sensor, an illuminance sensor, an imaging device, an audio input device, a viewpoint input device, and a pose detection device, and
the display device according to claim 14.

### Claim 25

A display device comprising a plurality of pixels, each pixel comprising:
a reflective display element;
a light-emitting element overlapping with the reflective display element;
a first transistor electrically connected to the reflective display element; and
a second transistor electrically connected to the light-emitting element,
wherein the light-emitting element is provided closer to a display surface of the display device than the reflective display element,
wherein a part of the first transistor is overlapped with a part of the second transistor,
wherein the reflective display element comprises:
a light-reflective layer; and
a layer configured to adjust an amount of light, the layer being provided over the light-reflective layer, and
wherein the reflective display element is configured to change an intensity of light reflected by the light-reflective layer using the layer.