Projector

Patent metadata

Field	Value
Publication number	US-9851629-B2
Application number	US-201414182979-A
Country	US
Kind code	B2
Filing date	Feb 18, 2014
Priority date	Feb 5, 2010
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

Disclosed is a projector, the projector including a light source, an illumination unit illuminating light incident from the light source, and a display device enabling to realize an image by receiving the light irradiated from the illumination unit, and whose center is positioned at an axis different from an optical axis of the illumination unit.

First claim

What is claimed is:

1. A projector, the projector comprising: a light source; an illumination unit comprising first and second collimation lenses advancing in parallel light emitted from the light source in a predetermined direction, wherein light emitted from the light source transmits through the collimation lenses; and a display device enabling to realize an image by receiving the light irradiated from the illumination unit, and whose center is positioned at an axis different from an optical axis of the illumination unit;
wherein the illumination unit includes an FEL (Fly Eye Lens), where the FEL includes micro lenses formed at an incidence surface for collecting the incident light on a light emitting surface, and micro lenses formed at a light emitting surface for advancing the collected light upwards from the optical axis; and
wherein a center of the light source is upwardly positioned from the optical axis of the collimation lenses; and
wherein the illumination unit includes an optical guide block receiving the light emitted from the light source to generate an optical shape that is same as that of the display device, and the collimation lenses are formed with an optical axis deviated from that of the optical guide block.

2. The projector of claim 1 , wherein the display device is positioned at an upward direction of the optical axis of the illumination unit.

3. The projector of claim 2 , wherein an offset of the display device is positioned at 1˜200%.

4. The projector of claim 1 , wherein the display device is a reflective display device or a transmissive display device.

5. The projector of claim 1 , further including a PBS (Polarizing Beam Splitter) that transmits the light from the illumination unit to the display device.

6. A projector, the projector comprising: a light source; an illumination unit comprising first and second collimation lenses advancing in parallel light emitted from the light source in a predetermined direction, wherein light emitted from the light source transmits through the collimation lenses; and a display device enabling to realize an image by receiving the light irradiated from the illumination unit, and whose center is positioned at an axis different from an optical axis of the illumination unit; wherein the illumination unit includes an optical part equally emitting the light from the collimation lenses to the display device, and at least one illumination lens that is tilted from the optical axis of the light source, the collimation lenses, and the optical part; and
wherein the illumination unit includes an optical guide block receiving the light emitted from the light source to generate an optical shape that is same as that of the display device, and the collimation lenses are formed with an optical axis deviated from that of the optical guide block.

7. The projector of claim 6 , further including a PBS transmitting the light from the illumination unit to the display device, wherein the illumination lens includes first and second illumination lenses, where the first illumination lens is interposed between the optical part and the PBS, and the second illumination lens is interposed between the PBS and the display device.

8. The projector of claim 1 , wherein the optical axis of the collimation lenses and the light source is tilted from the optical axis of the FEL.

9. The projector of claim 1 , wherein the optical axis of the light source and the collimation lenses and an optical axis of the FEL is identical.

10. A projector, the projector comprising: a light source; an illumination unit comprising first and second collimation lenses advancing in parallel light emitted from the light source in a predetermined direction, wherein light emitted from the light source transmits through the collimation lenses; and a display device enabling to realize an image by receiving the light irradiated from the illumination unit, and whose center is positioned at an axis different from an optical axis of the illumination unit; wherein the illumination unit includes an FEL (Fly Eye Lens) equally emitting the light of the collimation lenses to the display device, and a prism upwardly eccentrically emitting the light through the FEL to illuminate the display device; and
wherein the illumination unite includes an optical guide block receiving the light emitted from the light source to generate an optical shape that is the same as that of the display device, and the collimation lenses are formed with an optical axis deviated from that of the optical guide block.

11. The projector of claim 10 , wherein the prism is one of a structure of refracting the incident light and the emitted light to upwardly illuminate the display device, a structure of refracting the emitted light to upwardly illuminate the display device, and a structure of refracting the incident light to upwardly illuminate the display device.

12. The projector of claim 10 , wherein the prism is a projector formed with two sides that are not perpendicular to the optical axis of the illuminating unit.

13. The projector of claim 1 , wherein the illumination unit includes an FEL (Fly Eye Lens) equally emitting the light of the collimation lenses to the display device, and first and second lenses each having an optical axis different from that of the FEL, and upwardly illuminating the light through the FEL to the display device.

14. A projector, the projector comprising: a light source; an illumination unit comprising first and second collecting lenses collecting light emitted from the light source in a predetermined direction wherein light emitted from the light source transmits through the collecting lenses, and an optical guide block receiving the light emitted from the light source to generate an optical shape that is same as that of the display device, at least one collecting lens being formed with an optical axis deviated from that of the optical guide block; and a display device enabling to realize an image by receiving the light irradiated from the illumination unit, and whose center is positioned at an axis different from an optical axis of the illumination unit; wherein the first and second collecting lenses collecting the light emitted from the light source to the optical guide block are interposed between the light source and the optical guide block.

15. A projector, the projector comprising: collimation lenses advancing in parallel to a predetermined direction light emitted from a light source; an FEL (Fly Eye Lens) equally emitting the light of the collimation lenses to a display device; a prism upwardly and eccentrically illuminating the light through the FEL, formed with a first side and a second side that are not perpendicular to an optical axis of the FEL, a third side and a fourth side that are connected to the first and second sides, wherein the third side is connected to the first side or to the second side at an acute angle, and the fourth side is connected to the first side or to the second side at an obtuse angle; a display device enabling to realize an image by receiving the light emitted from the prism, and whose center is positioned at an axis different from the optical axis; and
an optical guide block receiving the light emitted from the light source to generate an optical shape that is same as that the display device, wherein the collimation lenses are formed with an optical axis deviated from that of the optical guide block.

Assignees

• Lg Innotek Co Ltd

Inventors

• Seo Eunsung
• Jeong Seungman
• Choi Hyunho
• Lee Sanghun

Classifications

• G02B5/04

  Prisms · CPC title

• G03B21/2073

  Polarisers in the lamp house (peculiar to electronic spatial light modulators H04N9/3197) · CPC title

• G03B21/208 Primary

  Homogenising, shaping of the illumination light · CPC title

• G02B27/644

  compensating for large deviations, e.g. maintaining a fixed line of sight while a vehicle on which the system is mounted changes course · CPC title

• G03B21/147 Primary

  Optical correction of image distortions, e.g. keystone · CPC title