PROJECTION DISPLAY APPARATUS

• US 20170153769A1
• Filed: 06/18/2015
• Published: 06/01/2017
• Est. Priority Date: 07/29/2014
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: MIURA, KOJI
• Granted Patent: US 10,372,269 B2
• Time in Patent Office: Days
• CPC Class Codes: G03B 17/54 with projector
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: G06F 3/0425 using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected tracking a projected light spot to determine a position on a display surface G06F3/0386
• 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 9/3155 for controlling the light source light source control per se H05B35/00 – H05B47/00; control of an illumination source for displays in general G09G3/3406
• CPC Class Codes: H04N 9/3164 using multiple light sources
• CPC Class Codes: H04N 9/3179 Video signal processing therefor
• CPC Class Codes: H04N 9/3194 including sensor feedback
• CPC Class Codes: H04N 9/3197 using light modulating optical valves

Abstract

A projection display apparatus of the disclosure includes: a light valve (21) that modulates illuminating light (L1) on the basis of image data to output the modulated light; an illuminating unit (1) including a light source, and a plurality of optical members for illumination that generate the illuminating light (L1) on the basis of light from the light source to guide the illuminating light (L1) to the light valve (21); a projection lens (24) that projects the modulated light from the light valve (21) on a projection surface (30A), and allows detection light to enter from a direction opposite to a travelling direction of the modulated light; and an imaging device (22) that is disposed at a location optically conjugated with the light valve (21), and allows the detection light to enter through the projection lens. One or more of the plurality of optical members for illumination have optical property of reducing a noise component that affects the detection light and arises inside the illuminating unit (1).

Claims

1. A projection display apparatus, comprising:

a light valve that modulates illuminating light on a basis of image data to output the modulated light;

an illuminating unit including a light source, and a plurality of optical members for illumination that generate the illuminating light on a basis of light from the light source to guide the illuminating light to the light valve;

a projection lens that projects the modulated light from the light valve on a projection surface, and allows detection light to enter from a direction opposite to a travelling direction of the modulated light; and

an imaging device that is disposed at a location optically conjugated with the light valve, and allows the detection light to enter through the projection lens,

one or more of the plurality of optical members for illumination having optical property of reducing a noise component, the noise component affecting the detection light and arising inside the illuminating unit.

2. The projection display apparatus according to claim 1, wherein the one or more of the plurality of optical members for illumination have the optical property of reducing the noise component by absorption, reflection, or transmission.

3. The projection display apparatus according to claim 1, wherein

the light source includes a plurality of light sources that are disposed on different optical paths,

the plurality of optical members for illumination include an optical path combination element that combines two or more of the optical paths on which respective two or more light sources of the plurality of light sources are disposed, and

the optical path combination element has the optical property of reducing the noise component.

4. The projection display apparatus according to claim 3, wherein the optical path combination element has optical property of causing reflection or transmission of the noise component in a direction deviated from an optical path of the illuminating light.

5. The projection display apparatus according to claim 1, wherein

the plurality of optical members for illumination include a mirror that bends an optical path of the illuminating light, and

the mirror has the optical property of reducing the noise component.

6. The projection display apparatus according to claim 5, wherein the mirror has optical property of transmitting the noise component in a direction deviated from the optical path of the illuminating light.

7. The projection display apparatus according to claim 1, further comprising an absorber that is disposed in a direction deviated from an optical path of the illuminating light and absorbs the noise component, wherein

the one or more of the plurality of optical members for illumination have optical property of guiding the noise component in the direction deviated from the optical path of the illuminating light by reflection or transmission.

8. The projection display apparatus according to claim 1, wherein the noise component includes light of an invisible light band.

9. The projection display apparatus according to claim 1, wherein the noise component includes light of an infrared light band.

10. The projection display apparatus according to claim 1, wherein the noise component includes light of a same wavelength band, as the detection light.

11. The projection display apparatus according to claim 1, wherein the noise component is a component included in the light generated from the light source.

12. The projection display apparatus according to claim 1, further comprising an image processor that detects, on a basis of a result of imaging by the imaging device, a position of a feature point of an object on the projection surface or in vicinity of the projection surface by making the position correspond to coordinates of a projection image projected on the projection surface.

13. The projection display apparatus according to claim 1, further comprising a light source unit for detection that emits invisible light for detection at a predetermined height from the projection surface, wherein

the imaging device allows the invisible light diffused by hitting an object, as the detection light, to enter through the projection lens.

14. The projection display apparatus according to claim 13, wherein the light source unit for detection emits infrared light as the invisible light for detection.

15. The projection display apparatus according to claim 1, further comprising a light source unit for detection that emits invisible light for detection, to provide coverage of at least a projection area on the projection surface with the invisible light for detection from a predetermined height, the projection area being an area projected by the projection lens, wherein

the imaging device allows the invisible light diffused by hitting an object in vicinity of the projection area, as the detection light, to enter through the projection lens.