Display device

• US 20070035826A1
• Filed: 09/30/2004
• Published: 02/15/2007
• Est. Priority Date: 09/30/2003
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Yokoyama, Toshifumi, Kasazumi, Ken'ichi, Yamamoto, Kazuhisa
• Granted Patent: US 7,593,159 B2
• Time in Patent Office: Days
• US Class Current: 359/444
• CPC Class Codes: G02B 27/48 Laser speckle optics
• CPC Class Codes: H04N 5/7416 involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
• CPC Class Codes: H04N 9/3129 scanning a light beam on the display screen scanning a light beam on a screen in displays other than projection devices G09G3/02; scanning systems in general G02B26/10; projectors using laser light sources in general H04N9/3161

Abstract

A display device of the present invention is provided with a light source (4) for emitting coherent light and displaying an image, and an image receiving part (1) comprising not less than two screens, onto which the coherent light is projected, wherein at least one of the screens constituting the image receiving part (1) is vibrated by an airflow applied to a front or rear surface of the image receiving part (1). Further, the image receiving part (1) has a function of a speaker. Thereby, when coherent light is used as a light source for display, it is possible to suppress spots of light intensity which are called speckle noise and occur due to interference of laser beams reflected at the image receiving part.

Claims

1. A display device comprising:

a unit for emitting coherent light and displaying an image; and

an image receiving part onto which the coherent light is projected, said image receiving part being vibrated by an airflow that is supplied to its front surface or rear surface.

2. A display device as defined in claim 1 wherein said airflow is supplied from a cooling fan disposed in the display device.

3. A display device as defined in claim 1 wherein said image receiving part comprises not less than two screens, and at least one of the screens is vibrated.

4. A display device as defined in claim 3 wherein said image receiving part has a function of a speaker.

5. A display device as defined in claim 3 wherein said image receiving part generates an acoustic wave of a high frequency.

6. A display device as defined in claim 5 wherein the frequency of the acoustic wave is not less than 20000 Hz.

7. A display device comprising:

a unit for emitting coherent light and displaying an image; and

an image receiving part onto which the coherent light is projected, said image receiving part being vibrated by an electric effect.

8. A display device as defined in claim 7 wherein

said image receiving part comprises not less than two screens, and

at least one of the screens is provided with a coil, while at least one of the remaining screens is provided with a magnetic body.