# US 9,039,186 B2 · Projector having tilted transmissive substrate and multicolor pixel modulator

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- Number: US 9,039,186 B2
- Document ID: US9039186B2
- Status: Granted
- Kind: B2
- Application number: 13/348,030
- Filed: 2012-01-11
- Published: 2012-08-09
- Granted: 2015-05-26
- Earliest claimed: 2011-02-03
- Assignees: Seiko Epson Corporation
- Applicants: Hiroaki Yanai; Eiji Morikuni
- Inventors: Hiroaki Yanai; Eiji Morikuni
- Web page: https://patentgrep.com/patent/US9039186B2

## CPC

- 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)}
- G03B 21/2066: {Reflectors in illumination beam (in projection beam G03B21/28)}
- G03B 21/208: {Homogenising, shaping of the illumination light}
- G03B 21/28: Reflectors in projection beam {(in illumination beam G03B21/2066)}
- H04N 9/3152: {for shaping the light beam (beam shaping per se G02B27/09)}
- H04N 9/3197: {using light modulating optical valves}
- G03B 21/00: Projectors or projection-type viewers; Accessories therefor (devices for changing pictures G03B23/00)
- G03B 33/12: using beam-splitting or beam-combining systems, e.g. dichroic mirrors
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- 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 includes: a light source device; a light modulation device adapted to modulate a light beam emitted from the light source device; a light transmissive substrate adapted to transmit the light beam modulated by the light modulation device; and a projection optical device adapted to project the light beam transmitted through the light transmissive substrate, wherein the light modulation device includes a first light modulation unit having a plurality of pixels arranged, the pixels having colors different from each other, and the light transmissive substrate is disposed so as to be tilted with respect to an imaginary plane perpendicular to a light axis of the light beam modulated by the first light modulation unit.

## Claims

### Claim 1

A projector comprising:
a light source device;
a first light modulation device adapted to modulate a light beam emitted from the light source device;
a second light modulation device adapted to modulate a light beam emitted from the light source device;
a light transmissive substrate adapted to transmit the light beam modulated by the first light modulation device; and
a projection optical device adapted to project the light beam transmitted through the light transmissive substrate,
wherein the first light modulation device includes a first light modulation unit having a plurality of pixels with different colors blue and red arranged side by side along a second direction,
the second light modulation device includes a second light modulation unit having a plurality of pixels with a same color green arranged side by side along a first direction perpendicular to the second direction, an astigmatism in the second direction being larger than an astigmatism in the first direction, and
the light transmissive substrate is disposed so as to be tilted with respect to an imaginary plane perpendicular to a light axis of the light beam modulated by the first light modulation unit.

### Claim 2 (depends on 1)

The projector according to claim 1, wherein
the first light modulation device is composed of the first light modulation unit alone.

### Claim 3 (depends on 1)

The projector according to claim 1, wherein
the projection optical device projects a light beam obtained by combining the light beam transmitted through the light transmissive substrate and a light beam modulated by the second light modulation device.

### Claim 4 (depends on 3)

The projector according to claim 3, wherein
the light transmissive substrate is formed of a reflective polarization plate, and transmits the light beam modulated by the first light modulation device while reflecting the light beam modulated by the second light modulation device to thereby combine the light beam modulated by the first light modulation device and the light beam modulated by the second light modulation device.

### Claim 5

A projector comprising:
a light source device;
a light modulation device adapted to modulate a light beam emitted from the light source device;
a light transmissive substrate adapted to transmit the light beam modulated by the light modulation device; and
a projection optical device adapted to project the light beam transmitted through the light transmissive substrate,
wherein the light modulation device includes a first light modulation unit having a plurality of pixels arranged, the pixels having colors different from each other,
the light transmissive substrate is disposed so as to be tilted with respect to an imaginary plane perpendicular to a light axis of the light beam modulated by the first light modulation unit, and is formed of a reflective polarization plate,
the plurality of pixels is arranged so that pixels with the same color are arranged side by side along a first direction and pixels with different colors are arranged side by side along a second direction perpendicular to the first direction, an astigmatism in the second direction being larger than an astigmatism in the first direction,
the light transmissive substrate is parallel to a plane obtained by rotating the imaginary plane around an imaginary straight line extending along the first direction, and
the reflective polarization plate is configured to reflect the light beam of a first linearly polarized light having a first polarization direction along the first direction and is configured to transmit the light beam of a second linearly polarized light having a second polarization direction along the second direction.