VIDEO DISPLAY DEVICE, VIDEO DISPLAY METHOD, VIDEO DISPLAY SCREEN AND LIQUID CRYSTAL DISPLAY DEVICE

• US 20120086862A1
• Filed: 07/01/2010
• Published: 04/12/2012
• Est. Priority Date: 07/03/2009
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.), Research Organization Of Information And Systems
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.), Research Organization Of Information And Systems
• Inventors: Gohshi, Seiichi, Echizen, Isao
• Application Number:
  US13/376,398
• Publication Number:
  US 20120086862A1
• Time in Patent Office: Days
• US Class Current: 348/687
• CPC Class Codes: H04N 2005/91392 using means for preventing making copies of projected video images
• CPC Class Codes: H04N 21/4122 additional display device, e.g. video projector digital output for controlling a plurality of local displays G06F3/1423
• CPC Class Codes: H04N 21/4143 embedded in a Personal Computer [PC]
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection
• CPC Class Codes: H04N 9/3102 using two-dimensional electronic spatial light modulators micromechanical modulators as such G02B26/0833; liquid crystal modulators as such G02F1/13

Abstract

A video display system of the present invention includes (i) a projector that generates a display image in accordance with a digital video signal and (ii) a screen on which an image generated by the projector is projected and displayed. Provided behind the screen is an infrared-emitting unit that emits infrared light through a video display surface during a period of time in which a picture is being displayed on the screen. This allows invisible light to be emitted through a video display section such as a screen together with a displayed image, thereby degrading the image quality of a re-shot picture and rendering use of re-shot image content impossible.

Claims

1. A video display apparatus including (i) an image forming section that generates a display image in accordance with a digital video signal and (ii) a video display section on which an image generated by the image forming section is projected and displayed, the video display apparatus comprising a light-emitting section that emits invisible light through a surface of the video display section during a period of time in which a picture is being displayed on the video display section.

2. The video display apparatus as set forth in claim 1, wherein:

the video display section is provided with a plurality of holes; and

the light-emitting section is disposed behind the video display section.

3. The video display apparatus as set forth in claim 1, further comprising:

an image analysis section that analyzes brightness of a picture to be displayed on the video display section; and

a light emission control section that controls a state of emission of the light-emitting section, wherein

on the basis of the brightness of the picture as analyzed by the image analysis section, the light emission control section renders the light-emitting section higher in emission intensity when the picture to be displayed is bright than when the picture to be displayed is dark.

4. The video display apparatus as set forth in claim 1, wherein the light-emitting section is provided at least in a central part of an image display surface of the video display section.

5. The video display apparatus as set forth in claim 1, wherein the light-emitting section is provided in a plurality of places behind the video display section.

6. The video display apparatus as set forth in claim 1, wherein the light-emitting section blinks during the period of time in which the picture is being displayed on the video display section.

7. The video display apparatus as set forth in claim 6, wherein the light-emitting section has a light-emitting diode that blinks at a frequency of 4 Hz to 16 Hz.

8. The video display apparatus as set forth in claim 1, wherein the invisible light is infrared light.

9. The video display apparatus as set forth in claim 1, wherein the light-emitting section has its illuminating surface provided with a visible-light cut filter that blocks visible light.

10. A method for displaying a picture on a video display apparatus including (i) an image forming section that generates a display image in accordance with a digital video signal and (ii) a video display section on which an image generated by the image forming section is projected and displayed, the method comprising emitting invisible light through a surface of the video display section during a period of time in which a picture is being displayed on the video display section.

11. A video display screen on which an image formed in accordance with a digital video signal is displayed, the video display screen comprising:

a video display sheet; and

a light-emitting section that emits invisible light through a surface of the video display sheet during a period of time in which a picture is being displayed on the video display sheet.

12. The video display sheet as set forth in claim 11, wherein:

the video display sheet is provided with a plurality of holes; and

the light-emitting section is disposed behind the video display sheet.

13. A liquid crystal display device including (i) a liquid crystal panel on which a picture is displayed and (ii) a backlight that irradiates the liquid crystal panel with light, the backlight comprising:

a visible light source that irradiates the liquid crystal panel with visible light; and

a light-emitting section that emits invisible light,

the backlight emitting the invisible light through an image display surface of the liquid crystal panel during a period of time in which a picture is being displayed on the liquid crystal panel.

14. The liquid crystal display device as set forth in claim 13, further comprising:

an image analysis section that analyzes brightness of a picture to be displayed on the liquid crystal panel; and

a light emission control section that controls a state of emission of the light-emitting section, wherein

on the basis of the brightness of the picture as analyzed by the image analysis section, the light emission control section renders the light-emitting section higher in emission intensity when the picture to be displayed is bright than when the picture to be displayed is dark.

15. The liquid crystal display device as set forth in claim 13, wherein the light-emitting section irradiates at least in a central part of an image display surface of the liquid crystal panel with the invisible light.

16. The liquid crystal display device as set forth in claim 13, wherein the light-emitting section has a plurality of invisible light sources.

17. The liquid crystal display device as set forth in claim 13, wherein the light-emitting section blinks during the period of time in which the picture is being displayed on the liquid crystal panel.

19. The liquid crystal display device as set forth in claim 13, wherein the invisible light is infrared light.

20. The liquid crystal display device as set forth in claim 13, wherein the light-emitting section has its illuminating surface provided with a visible-light cut filter that blocks visible light.

21. The liquid crystal display device as set forth in claim 13, wherein the backlight is a direct backlight.

22. The liquid crystal display device as set forth in claim 13, wherein the backlight is a side-edge backlight.

18. The liquid crystal display device as set forth in 17, wherein the light-emitting section has a light-emitting diode that blinks at a frequency of 4 Hz to 16 Hz.