# US 2026/0093136 A1 · Display device

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- Number: US 2026/0093136 A1
- Document ID: US20260093136A1
- Status: Published application
- Kind: A1
- Application number: 19/340,822
- Filed: 2025-09-25
- Published: 2026-04-02
- Earliest claimed: 2024-09-27
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Shinsuke FUJIKAWA
- Web page: https://patentgrep.com/patent/US20260093136A1

## CPC

- G02F 1/13318: {Circuits comprising a photodetector}
- G02F 1/1309: {Repairing; Testing}
- G02F 1/133512: {Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence)}
- G02F 1/133524: {Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides}
- G03B 21/006: {using LCD's}
- 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
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)

## Abstract

A display device includes: an exterior housing; a liquid crystal panel provided in the exterior housing and configured to radiate second light including light in a wavelength range longer than a first wavelength range when first light including light in the first wavelength range is incident; a photodetection unit configured to detect the second light and third light that is incident from outside the exterior housing; a first light guide unit configured to guide the third light to the photodetection unit; and a control unit configured to correct a detection value of the second light which is detected by the photodetection unit based on a detection value of the third light which is detected by the photodetection unit.

## Claims

### Claim 1

A display device comprising:
an exterior housing;
a liquid crystal panel provided in the exterior housing and configured to radiate second light including light in a wavelength range longer than a first wavelength range when first light including light in the first wavelength range is incident;
a photodetection unit configured to detect the second light and third light that is incident from outside the exterior housing;
a first light guide unit configured to guide the third light to the photodetection unit; and
a control unit configured to correct a detection value of the second light which is detected by the photodetection unit based on a detection value of the third light which is detected by the photodetection unit.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein
the third light includes light in a wavelength range longer than the first wavelength range.

### Claim 3 (depends on 1)

The display device according to claim 1, further comprising:
a light shielding cap configured to prevent incidence of the third light on the first light guide unit.

### Claim 4 (depends on 1)

The display device according to claim 1, wherein
the control unit calculates a correction coefficient for correcting the detection value of the second light based on the detection value of the third light.

### Claim 5 (depends on 4)

The display device according to claim 4, further comprising:
a storage unit in which the correction coefficient is stored.

### Claim 6 (depends on 1)

The display device according to claim 1, further comprising:
a second light guide unit configured to guide the second light to the photodetection unit.

### Claim 7 (depends on 6)

The display device according to claim 6, wherein
the first light guide unit has a diameter smaller than a diameter of the second light guide unit.

### Claim 8 (depends on 1)

The display device according to claim 1, further comprising:
a light shielding body surrounding the photodetection unit.

### Claim 9 (depends on 6)

The display device according to claim 6, further comprising:
a wavelength filter provided between a light emission surface of the second light guide unit and the photodetection unit and configured to reduce light in the first wavelength range.