# US 7,611,250 B2 · Projector

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- Number: US 7,611,250 B2
- Document ID: US7611250B2
- Status: Granted
- Kind: B2
- Application number: 11/163,681
- Filed: 2005-10-27
- Published: 2007-05-03
- Granted: 2009-11-03
- Earliest claimed: 2005-10-27
- Assignees: Chunghwa Picture Tubes, Ltd.
- Inventors: Jyh-Long Chern; Ran-Hong Chang; Yi-Kai Cheng; Ming-Der Chou
- Web page: https://patentgrep.com/patent/US7611250B2

## CPC

- G03B 21/10: Projectors with built-in or built-on screen
- G03B 21/28: Reflectors in projection beam {(in illumination beam G03B21/2066)}
- 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 including a display screen and an imaging system is provided. The imaging system is adapted for providing an optical image and the optical image is transmitted to the display screen through an optical transmission medium. The refractive index of the optical transmission medium is not equal to one. The transmission path of the optical image is changed by controlling the refraction index of the optical transmission medium in order to thin the projector.

## Claims

### Claim 1

A projector, comprising:
a display screen;
an imaging system adapted to provide an optical image and
an optical transmission medium, the display screen and the imaging system respectively located at opposite sides of the optical transmission medium, the optical image transmitted to the display screen through the optical transmission medium, wherein a refractive index of the optical transmission medium is not equal to one and not fixed, and a transmission path of the optical image transmitted to the display screen is determined by the refraction index of the optical transmission medium such that the transmission path of the optical image is bended by less than 90°.

### Claim 2 (depends on 1)

The projector according to claim 1, wherein the optical transmission medium comprises liquid crystals, a solid material, a liquid material and a combination thereof.

### Claim 3 (depends on 2)

The projector according to claim 2, wherein the solid material comprises SiO2, a plastic material and a combination thereof.

### Claim 4 (depends on 2)

The projector according to claim 2, wherein the solid material comprises a dopant.

### Claim 5 (depends on 4)

The projector according to claim 4, wherein the solid material is SiO2.

### Claim 6 (depends on 5)

The projector according to claim 5, wherein the dopant is indium.

### Claim 7 (depends on 3)

The projector according to claim 3, wherein the plastic material comprises polycarbonate, polymethyl methacrylate and a combination thereof.

### Claim 8 (depends on 2)

The projector according to claim 2, wherein the liquid material comprises water, an organic solvent and a combination thereof.