SYSTEMS AND METHODS FOR ELIMINATING LASER LIGHT SOURCE SCINTILLATION IN A PROJECTION TELEVISION

• US 20100053474A1
• Filed: 08/20/2009
• Published: 03/04/2010
• Est. Priority Date: 08/31/2008
• Status: Abandoned Application

• Current Assignee: Mitsubishi Electric US Incorporated (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Electric US Incorporated (Mitsubishi Electric Corporation)
• Inventors: Kamei, Hiromi
• Application Number:
  US12/544,937
• Publication Number:
  US 20100053474A1
• Time in Patent Office: Days
• US Class Current: 348/744
• CPC Class Codes: G03B 21/62 Translucent screens
• 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
• CPC Class Codes: H04N 9/3141 Constructional details thereof details not peculiar to the presence of an electronic spatial light modulator G03B21/14

Abstract

Systems and methods that facilitate the elimination of screen scintillation in a projection television having a laser light source. In a preferred embodiment, a display screen assembly of the television includes a liquid dispersed between the fresnel lens and lenticular screen, and sealed there between by a seal extending about the perimeter of the screen assembly. One or more vibration units are operably coupled to the liquid causes the liquid to vibrate between the Fresnel lens and lenticular screen as the light emanating from the laser light source diffuses through the liquid.

Claims

1. A television comprising

an enclosure,

a video display screen mounted on the enclosure, the display screen includes a Fresnel lens coupled in spaced relation to a lenticular screen with the space between the Fresnel lens and lenticular screen filled with a liquid,

a laser light source optically coupled to the display screen, and

a vibration source operably coupled to the liquid to cause the liquid to vibrate.

2. The television of claim 1 further comprising a seal extending about the perimeter of the screen.

3. The television of claim 1 wherein the vibration source comprising one or more vibration generating devices coupled to one or more sides of the screen.

4. The television of claim 3 wherein the one or more vibration generating devices comprises an ultrasound generating device.

5. The television of claim 3 wherein the one or more vibration generating devices comprises an oscillator.

6. The television of claim 3 wherein the one or more vibration generating devices comprises an oscillating membrane.

7. A television comprising

an enclosure,

a display screen assembly comprising a Fresnel lens coupled in spaced relation to a lenticular screen and mounted on the enclosure,

a liquid disposed in the space between the Fresnel lens and lenticular screen,

a laser light source optically coupled to the display screen, and

a motion generation source operably coupled to the liquid to cause the molecules of the liquid to move.

8. The television of claim 7 further comprising a seal extending about the perimeter of the screen.

9. The television of claim 7 wherein the liquid is glycol.

10. A method of reducing screen scintillation in a laser light source television comprising the steps of

diffusing the light which forms a projected image through liquid as it passes from a Fresnel lens to a lenticular screen, and

continuously changing the phase of the light striking the lenticular.

11. The method of claim 10 wherein in the step of continuously changing the phase of the light striking the lenticular screen includes continuously altering the length of the path that the coherent light from the laser light source takes as it diffuses through the liquid.

12. The method of claim 10 wherein the length of the path that the coherent light from the laser light source takes is altered by vibrating the liquid between the Fresnel lens and the lenticular screen.

13. A method of reducing screen scintillation in a laser light source television comprising the steps of

projecting an image onto a display screen assembly of the television, wherein the display screen assembly comprising a Fresnel lens coupled in spaced relation to a lenticular screen with a liquid filling the space formed there between;

and

causing the molecules of the liquid to move as the light of the projected image diffuses from the Fresnel lens through the liquid to the lenticular screen.