Projection Display Apparatus

• US 20090040472A1
• Filed: 04/21/2006
• Published: 02/12/2009
• Est. Priority Date: 04/22/2005
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Wakita, Naohide
• Granted Patent: US 7,771,058 B2
• Time in Patent Office: Days
• US Class Current: 353/69
• CPC Class Codes: G02B 7/28 Systems for automatic generation of focusing signals
• CPC Class Codes: G03B 21/10 Projectors with built-in or built-on screen
• CPC Class Codes: G03B 21/28 Reflectors in projection beam in illumination beam G03B21/2066
• CPC Class Codes: G03B 2205/0007 Movement of one or more optical elements for control of motion blur imaging systems in general using optical elements for stabilisation of the position of the image G02B27/64
• CPC Class Codes: G03B 29/00 Combinations of cameras, projectors or photographic printing apparatus with non-photographic non-optical apparatus, e.g. clocks or weapons; Cameras having the shape of other objects combinations with flash apparatus G03B15/03
• CPC Class Codes: H04M 1/0272 for a projector or beamer module assembly constructional features of projectors per se G03B21/00; constructional details of projectors using electronic spatial light modulators per se H04N9/31
• CPC Class Codes: H04N 9/3141 Constructional details thereof details not peculiar to the presence of an electronic spatial light modulator G03B21/14
• CPC Class Codes: H04N 9/3185 Geometric adjustment, e.g. keystone or convergence optical or mechanical adjustment of convergence H04N9/317; using scanning means H04N3/22; optical or mechanical adjustments of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/14
• CPC Class Codes: H04N 9/3194 including sensor feedback

Abstract

A portable projection display apparatus (100) of the present invention comprises: a projection device (8) including an image forming means (2) for forming image light and an optical lens system (7) which projects the image light, obtained by the image forming means, toward a projection surface (S1); a swinging detecting means (12) for detecting a relative swinging of the projection device (8) with respect to the projection surface (S1); and a correcting means (11) for correcting a projection direction of the image light with respect to the projection surface (S1) in the projection device (8) in accordance with an output value of the swinging detecting means (12), so as to cancel a movement of the image light in the projection direction that is caused by the swinging.

Claims

1. A portable projection display apparatus comprising:

a screen having a projection surface;

a projection device including an image forming means for forming image light and a projection optical lens system which projects the image light, obtained by the image forming means, towards the projection surface such that the projection optical lens system is able to change a projection direction of the image light;

a swinging detecting means for detecting a relative swinging of the projection device with respect to the projection surface based on an energy wave which arrives from the projection surface by passing through the projection optical lens system and does not adversely affect the image light; and

a correcting means for correcting the projection direction of the projection optical lens system in accordance with an output value of the swinging detecting means, so as to cancel a relative movement of the image light in the projection direction that is caused by the swinging,

wherein the swinging detecting means includes a radiation source which is stored in the projection device for emitting the energy wave and a sensor which detects the energy wave which is emitted from the radiation source, passes through the projection optical lens system, is projected on the projection surface, is reflected by the projection surface, passes through the projection optical lens system and is incident on the sensor, and the swinging detecting means detects the relative swinging of the projection device with respect to the projection surface based on the energy wave detected by the sensor,

the projection surface is provided with a marking which gives a predetermined characteristic to the energy wave reflected by the projection surface based on an interaction between the marking and the energy wave, and

the optical lens system is configured to be able to adjust a focus of the projected image light,

the portable projection display apparatus further comprising an automatic focus adjusting means for detecting a focus status of the optical lens system based on the energy wave which is detected by the sensor of the swinging detecting means and to which the predetermined characteristic is given, and for adjusting the focus of the optical lens system based on the focus status.

4. The projection display apparatus according to claim 1, wherein the swinging detecting means detects a relative swinging occurred between the projection device and the projection surface in a state where the projection surface is not fixed to the projection device.

15. The projection display apparatus according to claim 1, wherein the swinging detecting means detects a status signal of the marking based on the energy wave to which the predetermined characteristic is given, and determines projection positions of the projection device and the projection surface based on the status signal.

16. The projection display apparatus according to claim 1, further comprising a light emitting means,

wherein the image forming means forms the image light based on light emitted from the light emitting means.

17. The projection display apparatus according to claim 1, wherein the energy wave is infrared.

18. The projection display apparatus according to claim 1, wherein the marking is formed at a region of the projection surface on which the image light is projected.

19. The projection display apparatus according to claim 18, wherein the marking is formed at a substantially center portion of the projection surface.

20. The projection display apparatus according to claim 1, wherein the predetermined characteristic given by the marking includes both information of projection positions of the projection device and the projection surface and information of a focus status of the optical lens system.

21. The projection display apparatus according to claim 20, wherein the marking is a bar code thin line or a concentric circular thin line.

2-3. -3. (canceled)

5-14. -14. (canceled)