Projector including color filters

Patent metadata

Field	Value
Publication number	US-11966152-B2
Application number	US-201917417353-A
Country	US
Kind code	B2
Filing date	Oct 7, 2019
Priority date	Jan 22, 2019
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

A projector comprises: a light source that projects laser light; a first color filter including a reflective portion reflecting the laser light emitted from the light source, and a transmissive portion transmitting the laser light; a phosphorus plate that converts the laser light reflected from the first color filter into phosphorescent light; a second color filter including color films of different colors through which the phosphorescent light transmits; and a display element that is provided with the laser light transmitted from the first color filter and the phosphorescent light transmitted through the second color filter so as to project an image, wherein the projector can be reduced in volume since the number of lenses used in an optical system can be reduced by shortening an optical path.

First claim

What is claimed is:

1. A projector, comprising:
a light source projecting a laser light;
a color disc rotating around a center thereof, wherein the color disc includes
a first color filter including a reflective part reflecting the laser light projected from the light source and a transmissive part transmitting the laser light;
a phosphor plate converting the laser light reflecting from the reflective part of the first color filter into a phosphorescence, wherein the color disc further includes
a second color filter including color films of different colors through which the phosphorescence passes; and
a display element projecting an image by being provided with the laser light transmitted by the transmissive part of the first color filter and the phosphorescence having passed through the color films of the second color filter,
wherein the color films are entirely disposed at a position corresponding to the reflective part of the first color filter.

2. The projector of claim 1 , wherein the first color filter includes the reflective part and the transmissive part disposed in a first distance from the center of the color disc and wherein the color films of the second color filter are disposed in a second distance from the center of the color disc.

3. The projector of claim 1 , wherein the reflective part of the first color filter is disposed in a manner of overlapping with the color films of the second color filter.

4. The projector of claim 1 , wherein the phosphor plate includes a phosphorescent material located in a same distance from a center of a rotating disc and wherein one or two species of the phosphorescent material exist.

5. The projector of claim 1 , wherein the phosphor plate includes a fixed position mirror coated with a phosphorescent material reflecting the laser light by converting the laser light into the phosphorescence.

6. The projector of claim 1 , further comprising a first dichroic filter enabling one of the laser light reflecting from the first color filter or the phosphorescence reflecting from the phosphor plate to pass through and reflecting the other.

7. The projector of claim 1 , further comprising a second dichroic filter transmitting the laser light transmitted in the first color filter and transmitting the phosphorescence having passed through the second color filter.

8. The projector of claim 1 , wherein the light source includes a laser diode emitting a blue light.

9. The projector of claim 8 , wherein the phosphor plate includes a phosphorescent material converting the light source into yellow or green.

10. The projector of claim 1 , further comprising a first mirror reflecting and providing the laser light having passed through the first color filter to the display element.

11. The projector of claim 1 , further comprising a second mirror reflecting and providing the laser light reflecting from the first color filter to the phosphor plate.

12. The projector of claim 1 , wherein the laser light is obliquely incident on the color disc and a direction of the laser light reflected at the reflective part of the first color filter is different from a direction of the laser light incident to the reflective part.

13. A projector comprising:
a light source projecting a laser light;
a color disc rotating around a center, wherein the color disc includes
a first color filter including a reflective part reflecting the laser light projected from the light source and a transmissive part transmitting the laser light;
a phosphor plate converting the laser light reflecting from the reflective part of the first color filter into a phosphorescence, wherein the color disc further includes
a second color filter including color films of different colors through which the phosphorescence passes; and
a display element projecting an image by being provided with the laser light transmitted by the transmissive part of the first color filter and the phosphorescence having passed through the color films of the second color filter,
wherein the laser light projected directly from the light source is obliquely incident on the color disc and a direction of the laser light reflected at the reflective part of the first color filter is different from a direction of the laser light incident to the reflective part.

Assignees

• Lg Electronics Inc

Inventors

• KANG Shingyu
• Bok Kiso
• Ahn Jaehoon

Classifications

• G03B21/204 Primary

  using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197) · CPC title

• G02B5/26

  Reflecting filters (G02B5/28 takes precedence) · CPC title

• G03B21/2066

  Reflectors in illumination beam (in projection beam G03B21/28) · CPC title

• H04N9/3117 Primary

  by using a sequential colour filter producing two or more colours simultaneously, e.g. by creating scrolling colour bands · CPC title

• H04N9/31

  Projection devices for colour picture display {, e.g. using electronic spatial light modulators [ESLM]} · CPC title