Display device

• US 7,593,159 B2
• Filed: 09/30/2004
• Issued: 09/22/2009
• Est. Priority Date: 09/30/2003
• Status: Expired due to Fees

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Yokoyama, Toshifumi, Kasazumi, Ken'ichi, Yamamoto, Kazuhisa
• Primary Examiner(s): MAHONEY, CHRISTOPHER E
• Application Number:
  US10/573,990
• Publication Number:
  US 20070035826A1
• Time in Patent Office: 1,818 Days
• Field of Search: 359/444, 359/445, 359/446
• US Class Current: 359/446
• 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 coherent light can be projected, said image receiving part comprising at least two screens, at least one of the screens capable of being vibrated by an airflow supplied to at least one of a front surface or rear surface of said at least one screen.

2. A display device as defined in claim 1, additionally comprising a cooling fan for supplying said airflow.

3. The display device according to claim 2, wherein the cooling fan is capable of directing the airflow between the two screens.

4. A display device as defined in claim 1 wherein said image receiving part is capable of functioning as a speaker.

5. A display device as defined in claim 1 wherein said image receiving part is capable of generating 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. The display device according to claim 1, wherein one of the two screens is transparent.

8. A display device comprising:

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

an image receiving part onto which coherent light can be projected, said image receiving part capable of being vibrated by an electric effect,

wherein said image receiving part comprises at least two screens, at least one of the screens having a coil, at least another of the screens having a magnetic film thereon, such that supplying a current to said coil vibrates the screen having the magnetic film thereon.

9. A display device as defined in claim 8 wherein said magnetic film comprises Fe.