# US 11,443,702 B2 · Display device and display system

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- Number: US 11,443,702 B2
- Document ID: US11443702B2
- Status: Granted
- Kind: B2
- Application number: 17/345,579
- Filed: 2021-06-11
- Published: 2021-09-30
- Granted: 2022-09-13
- Earliest claimed: 2019-01-31
- Assignees: Japan Display Inc.
- Applicants: Japan Display Inc.
- Inventors: Hisashi Tomitani
- Web page: https://patentgrep.com/patent/US11443702B2

## CPC

- G09G 3/3413: {Details of control of colour illumination sources}
- G09G 3/36: using liquid crystals
- G09G 3/3614: {Control of polarity reversal in general}
- G09G 3/3655: {Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors}
- G09G 2310/0235: Field-sequential colour display
- G09G 2320/0633: by amplitude modulation of the brightness of the illumination source
- G09G 2320/064: by time modulation of the brightness of the illumination source
- G09G 2320/0666: for control of colour parameters, e.g. colour temperature
- 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)

## Abstract

A display device includes: a liquid crystal display panel including a liquid crystal between two substrates; and first, second, and third light sources emitting light in different colors. A light emission period includes a first light emission period is which luminance of the first light source is higher than luminance of the second and third light sources, and at least one of the second and third light sources emits light, a second light emission period in which the luminance of the second light source is higher than the luminance of the first and the third light sources, and at least one of the first and third light sources emits light, and a third light emission period in which the luminance of the third light source is higher than the luminance of the first and second light sources, and at least one of the first and second light sources emits light.

## Claims

### Claim 1

A display system comprising:
a display device that comprises
a liquid cry seal display panel in which a liquid crystal is sealed between two substrates facing each other, and
a first light source, a second light source, and a third light source configured to emit light in colors different from one another; and
a control device configured to control the first to third light sources to emit light such that saturation of color obtained by causing the first to third light sources to emit light in a first light emission period is lower than saturation of color obtained by causing only the first light source to emit light,
saturation of color obtained by causing the first to third light sources to emit light in a second light emission period is lower than saturation of color obtained by causing only the second light source to emit light, and
saturation of color obtained by causing the first to third light sources to emit light in a third light emission period is lower than saturation of color obtained by causing only the third light source to emit light.

### Claim 2 (depends on 1)

The display system according to claim 1,
wherein the control device is configured to
control the light emission of the second light source and the third light source during the first light emission period,
control the light emission of the first light source and the third light source during the second light emission period, and
control the light emission of the first light source and the second light source during the third light emission period.

### Claim 3 (depends on 2)

The display system according to claim 2,
wherein the display device or the control device comprises a detector configured to detect brightness of ambient light, and
wherein the control device is configured to control, based on the brightness of the ambient light,
luminance of the second light source and luminance of the third light source during the first light emission period,
luminance of the first light source and the luminance of the third light source during the second light emission period, and
the luminance of the first light source and the luminance of the second light source during the third light emission period.

### Claim 4 (depends on 1)

The display system according to claim 1,
wherein the control device is configured to
control the light emission of the second light source or the third light source during the first light emission period,
control the light emission of the first light source or the third light source during the second light emission period, and
control the light emission of the first light source or the second light source during the third light emission period.

### Claim 5 (depends on 1)

The display system according to claim 1,
wherein the first light source is configured to emit red light,
wherein the second light source is configured to emit green light, and
wherein the third light source is configured to emit blue light.