# US 10,321,108 B2 · Projector and control method of projector

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- Number: US 10,321,108 B2
- Document ID: US10321108B2
- Status: Granted
- Kind: B2
- Application number: 15/394,426
- Filed: 2016-12-29
- Published: 2017-07-20
- Granted: 2019-06-11
- Earliest claimed: 2001-01-19
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Tatsuya Iguchi; Takashi Toyooka
- Web page: https://patentgrep.com/patent/US10321108B2

## CPC

- H04N 9/3194: {including sensor feedback}
- G02B 5/0278: {used in transmission}
- G02B 5/0284: {used in reflection}
- G02B 5/0294: {adapted to provide an additional optical effect, e.g. anti-reflection or filter}
- G02B 27/48: Laser speckle optics
- G03B 21/204: {using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197)}
- G03B 21/2053: {Intensity control of illuminating light (controlled by video signal processing H04N5/74 or H04N9/31)}
- G03B 21/2073: {Polarisers in the lamp house (peculiar to electronic spatial light modulators H04N9/3197)}
- G03B 33/12: using beam-splitting or beam-combining systems, e.g. dichroic mirrors
- H04N 9/3105: {for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators (simultaneous projection in colour photography G03B33/10; beam splitting or combining systems per se G02B27/10)}
- H04N 9/3158: {for controlling the spectrum}
- H04N 9/3167: {for polarizing the light beam (polarizing optical systems per se G02B27/28)}
- H04N 9/3182: {Colour adjustment, e.g. white balance, shading or gamut (white balance per se H04N9/73; control of amplitude of colour signals H04N9/68; colour control circuits for displays in general G09G5/02, G09G3/2003, G09G3/3607)}
- G02B 5/02: Diffusing elements; Afocal elements
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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 projector which modulates light emitted from a solid light source by an optical modulator and projects an image includes, a division unit which divides first light beams forming the image, a diffusion plate which diffuses one of the first light beams divided by the division unit, a first sensor which receives the light beams diffused by the diffusion plate, a second sensor which receives second light beams having a full width at the half maximum of a spectrum different from the first light beams and forming the image, an adjustment unit which adjusts a ratio of the first light beams to the second light beams according to a detection result of the first sensor and a detection result of the second sensor.

## Claims

### Claim 1

A projector which modulates light emitted from a solid light source by a first optical modulator and projects an image, the projector comprising:
a division unit which divides first light beams forming the image;
a diffusion plate which diffuses one of the first light beams divided by the division unit, such that the first light beams incident on the division unit proceed to either the diffusion plate or the first optical modulator, wherein the first optical modulator modulates one of the first light beams divided by the division unit;
a first sensor which receives the light beams diffused by the diffusion plate;
a second sensor which receives a second light beams having a full width at the half maximum of a spectrum different from the first light beams and forming the image; and
an adjustment unit which adjusts a ratio of the first light beams to the second light beams according to a detection result of the first sensor and a detection result of the second sensor, wherein:
a diffusion plate which diffuses the second light beams is not included between (I) an optical member which guides the second light beams to the second sensor and (II) the second sensor.

### Claim 2 (depends on 1)

The projector according to claim 1,
wherein the diffusion plate which diffuses one of the first light beams divided by the division unit is included between the division unit and the first sensor.

### Claim 3 (depends on 1)

The projector according to claim 1, further comprising:
a polarization plate included between an optical member guiding the first light beams to the first sensor and the diffusion plate.

### Claim 4 (depends on 1)

The projector according to claim 1, further comprising:
a second optical modulator which modulates the second light beams.

### Claim 5 (depends on 4)

The projector according to claim 4, further comprising:
a fluorescent substance which emits light beams containing the second light beams by being irradiated with the first light beam emitted by the solid light source, wherein:
the second light beams contained in the light beams emitted by the fluorescent substance are guided to the second optical modulator; and
the adjustment unit adjusts a ratio of the first light beams to be guided to the first optical modulator to the first light beams to be guided to the fluorescent substance.

### Claim 6

A control method of a projector which modulates light emitted from a solid light source by a first optical modulator, projects an image and includes a division unit which divides first light beams forming the image, a diffusion plate which diffuses one of the first light beams divided by the division unit, such that the first light beams incident on the division unit proceed to either the diffusion plate or the first optical modulator, the first optical modulator modulating one of the first light beams divided by the division unit, a first sensor which receives the light beams diffused by the diffusion plate, and a second sensor which receives a second light beams having a full width at the half maximum of a spectrum different from the first light beams and forming the image, wherein a diffusion plate which diffuses the second light beams is not included between an optical member which guides the second light beams to the second sensor and the second sensor, the control method comprising: adjusting a ratio of the first light beams to the second light beams according to a detection result of the first sensor and a detection result of the second sensor.