ILLUMINATION DEVICE AND PROJECTION SYSTEM HAVING THE SAME

• US 20090059099A1
• Filed: 09/04/2008
• Published: 03/05/2009
• Est. Priority Date: 09/05/2007
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: LINKOV, Alexander Evgenievich, URUSOVA, Maria Valerievna, BRATISHCHEV, Alexey Vladimirovich, SERGIEVSKAYA, Irina Vladimirovna
• Application Number:
  US12/204,373
• Publication Number:
  US 20090059099A1
• Time in Patent Office: Days
• US Class Current: 348/760
• CPC Class Codes: H04N 9/3111 for displaying the colours sequentially, e.g. by using sequentially activated light sources sequential projection in colour photography G03B33/08
• CPC Class Codes: H04N 9/3164 using multiple light sources

Abstract

The illumination device includes a plurality of light source units and a plurality of optical concentrators facing the plurality of light source units and each having an entry surface, lateral surfaces, and an output surface. A color synthesizing unit synthesizes light emitted by the plurality of optical concentrators and includes two intersecting dichroic filters. A relay optical system transmits light synthesized by the color synthesizing unit to an illuminated surface.

Claims

1. An illumination device comprising:

a plurality of light source units;

a plurality of optical concentrators facing the plurality of light source units, one of the plurality of the optical concentrators having an entry surface, lateral surfaces, and an output surface;

a color synthesizing unit which synthesizes light emitted by the plurality of optical concentrators and comprises a first dichroic filter and a second dichroic filter which intersects with the first dichroic filter; and

a relay optical system which transmits light synthesized by the color synthesizing unit to an illuminated surface.

2. The device of claim 1, wherein each of the plurality of light source units comprises an array of a plurality of light emitting diodes (LEDs) having a common emission surface.

3. The device of claim 2, wherein the common emission surface and the entry surface are spaced apart from each other by a predetermined distance.

4. The device of claim 3, wherein the predetermined distance is equal to or greater than 0.0001 h, where h is a minimal aperture of the array of the plurality of the LEDs.

5. The device of claim 1, wherein the first dichroic filter comprises a red dichroic filter including one plate and the second dichroic filter comprises a blue dichroic filter including two plates.

6. The device of claim 1, wherein a focusing surface of the relay optical system is formed at a distance of 0.05 H or greater from the illuminated surface, where H is a minimal aperture of the illuminated surface.

7. The device of claim 1, wherein an angle, which is formed between the entry surface and the lateral surface of one of the plurality of the optical concentrators, is greater than 90°

.

8. The device of claim 1, wherein a cross-sectional shape of one of the plurality of the optical concentrators is substantially the same as a shape of the illuminated surface.

9. The device of claim 1, wherein the output surface of one of the plurality of the optical concentrators is convex.

10. The device of claim 9, wherein the output surface of one of the plurality of the optical concentrators is spherical.

11. A projection system comprising:

the illumination device of claim 1;

a light modulator which modulates light transmitted by the relay optical system to form an image and comprises a working surface formed as the illuminated surface; and

a projection optical system which projects the image formed by the light modulator.

12. The system of claim 11, wherein the optical modulator comprises a reflection type display device.

13. The system of claim 12, wherein the reflection type display device comprises a micromirror device.

14. The system of claim 11, wherein each of the plurality of light source units comprises an array of a plurality of light emitting diodes (LEDs) having a common emission surface.

15. The system of claim 14, wherein the common emission surface and the entry surface are spaced apart from each other by a predetermined distance.

16. The system of claim 15, wherein the predetermined distance is equal to or greater than 0.0001 h where h is a minimal aperture of the array of the plurality of the LEDs.

17. The system of claim 11, wherein the first dichroic filter comprises a red dichroic filter including one plate and the second dichroic filter comprises a blue dichroic filter including two plates.

18. The system of claim 11, wherein a focusing surface of the relay optical system is formed at a distance of 0.05 H or greater from the illuminated surface where H is a minimal aperture of the illuminated surface.

19. The system of claim 11, wherein an angle, which is formed between the entry surface and the lateral surface of the one of the plurality of optical concentrators, is greater than 90°

.

20. The system of claim 11, wherein a cross-sectional shape of one of the plurality of the optical concentrators is substantially the same as a shape of the illuminated surface.

21. The system of claim 11, wherein the output surface of one of the plurality of the optical concentrators is convex.

22. The system of claim 21, wherein the output surface of one of the plurality of the optical concentrators is spherical.