DISPLAY SYSTEM

• US 20100060723A1
• Filed: 11/07/2007
• Published: 03/11/2010
• Est. Priority Date: 11/08/2006
• Status: Abandoned Application

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Imai, Masao, Miyasaka, Daigo, Kimura, Kazunori
• Application Number:
  US12/513,287
• Publication Number:
  US 20100060723A1
• Time in Patent Office: Days
• US Class Current: 348/56
• CPC Class Codes: G02B 30/24 involving temporal multiplexing, e.g. using sequentially activated left and right shutters
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2358/00 Arrangements for display data security
• CPC Class Codes: G09G 3/003 to produce spatial visual effects
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 5/12 Synchronisation between the display unit and other units, e.g. other display units, video-disc players
• CPC Class Codes: H04N 13/144 for flicker reduction
• CPC Class Codes: H04N 13/341 using temporal multiplexing
• CPC Class Codes: H04N 13/398 Synchronisation thereof; Control thereof
• CPC Class Codes: H04N 2013/403 the images being monoscopic

Abstract

[Problems] To eliminate flicker when a normal image is presented to user employing an optical shutter from two types or more of image under intermittent illumination of such as fluorescent lamp.

[Means for Solving Problems] In a display system (10) including a display panel (11A) which can display two types or more of image sequentially and repeatedly, and an optical shutter (13) which opens with the display cycle of a specific image among the images displayed on the screen of the display panel (11A), display cycle of the specific image on the display panel (11A) is set equal to an integer multiple of the flashing cycle of intermittent illumination (15) under intermittent illumination (15) flashing periodically.

Claims

1. A display system which displays two or more types of images including a specific image sequentially and repeatedly by a display device under an intermittent illumination, comprising:

a control device which controls a display cycle of the specific image and a flashing cycle of the intermittent illumination in such a manner that the display cycle of the specific image is set equal to an integer multiple of the flashing cycle of the intermittent illumination under the intermittent illumination which flashes periodically.

2. The display system as claimed in claim 1, comprising an optical shutter, wherein

the optical shutter opens/closes in synchronization with the display cycle of the specific image to extract only the specific image.

3. The display system as claimed in claim 1, wherein

the control device comprises a flashing cycle detecting device which detects the flashing cycle of the intermittent illumination;

and

a display cycle control device which changes the display cycle of the specific image,

the display cycle control device changing the display cycle of the specific image in such a manner that the display cycle of the specific image displayed by the display device is set equal to an integer multiple of the flashing cycle of the intermittent illumination under the intermittent illumination which flashes periodically, based on the flashing cycle detected by the flashing cycle detecting device.

4. The display system as claimed in claim 3, wherein

the control device further comprises a flashing cycle control device which changes the flashing cycle of the intermittent illumination

the flashing cycle control device controlling the flashing cycle of the intermittent illumination in such a manner that the display cycle of the specific image is set equal to an integer multiple of the flashing cycle of the intermittent illumination under the intermittent illumination which flashes periodically, based on the display cycle of the specific image.

5. The display system as claimed in claim 3, wherein

the flashing cycle detecting device comprises a flashing phase detecting device which detects the flashing phase of the intermittent illumination,

the display cycle control device comprises an image display starting point changing device which changes a display starting point of an image to be displayed,

the image display starting point changing device synchronizing the display starting point with the flashing phase detected by the flashing phase detecting device.

6. The display system as claimed in claim 4, wherein

the flashing cycle control device comprises a flashing phase changing device which changes the flashing phase of the intermittent illumination,

the flashing phase changing device synchronizing the flashing phase with the display starting point of the image to be displayed.

7. The display system as claimed in claim 3, wherein

the flashing cycle detecting device detects the flashing cycle or the flashing phase of the intermittent illumination from a waveform of an AC voltage of commercial power source applied to the display device.

8. The display system as claimed in claim 3, wherein

the display cycle control device sets the display cycle of the specific image to be either one of 1/50 second or 1/100 second when the flashing cycle detected by the flashing cycle detecting device is 1/100 second, and sets the display cycle of the specific image to be either one of 1/60 second or 1/120 second when the flashing cycle detected by the flashing cycle detecting device is 1/120 second.

9. The display system as claimed in claim 3, wherein:

the flashing cycle detecting device detects the flashing cycle or the flashing phase of the intermittent illumination by detecting a fluctuation in a brightness of the intermittent illumination.

10. The display system as claimed in claim 3, wherein

the flashing cycle detecting device comprises a transmitted light detecting device which detects a fluctuation in light transmitted through the optical shutter, and detects a fluctuation in a brightness of the intermittent illumination.

11. The display system as claimed in claim 5, comprising a display panel of reflection type or a transflective type, wherein

the image display starting point changing device changes the display starting point such that a value of integral of a transmitted light amount during an opening period of the optical shutter becomes a maximum based on a detection result of the flashing cycle detecting device.

12. The display system as claimed in claim 5, comprising a display panel of a transmission type, a transflective type, a projection type, or a light emitting type, wherein

the image display starting point changing device changes the display starting point such that a value of integral of the a transmitted light amount during an opening period of the optical shutter becomes a minimum based on a detection result of the flashing cycle detecting device.

13. The display system as claimed in claim 6, comprising a display panel of reflection type or a transflective type, wherein

the flashing phase changing device changes the flashing phase such that a value of integral of the a transmitted light amount during an opening period of the optical shutter becomes a maximum.

14. The display system as claimed in claim 6, comprising a display panel of a transmission type, a transflective type, a projection type, or a light emitting type, wherein

the flashing phase changing device changes the flashing phase such that a value of integral of the a transmitted light amount during an opening period of the optical shutter becomes a minimum.

15. The display system as claimed in claim 11, wherein

the flashing cycle detecting device comprises a transmitted light detecting device which detects a fluctuation in light transmitted through the optical shutter, and detects the brightness of the intermittent illumination.

16. The display system as claimed in claim 3, wherein the flashing cycle detecting device is built in the optical shutter.

17. The display system as claimed in claim 3, wherein the display cycle control device limits the display cycle of the specific image to 1/50 second or less.

18. The display system as claimed in claim 2, wherein the optical shutter is a liquid crystal shutter.

19. The display system as claimed in claim 1, wherein the two or more types of images includes the specific image and an inverted image that is formed by inverting the specific image.

20. The display system as claimed in claim 1, wherein the specific image is a black image displayed on an entire screen.

21. The display system as claimed in claim 1, wherein a right eye image and a left eye image required for a stereoscopic vision are included in the images displayed sequentially and repeatedly.

22. A control system which controls sequential and repeated displays of two or more types of images including a specific image by a display device under an intermittent illumination, comprising:

a control device which controls a display cycle of the specific image and a flashing cycle of the intermittent illumination in such a manner that the display cycle of the specific image is set equal to an integer multiple of the flashing cycle of the intermittent illumination under the intermittent illumination which flashes periodically.

23. The control system as claimed in claim 22, wherein

the control device comprises a flashing cycle detecting device which detects the flashing cycle of the intermittent illumination;

and

a display cycle control device which changes the display cycle of the specific image,

the display cycle control device changing the display cycle of the specific image in such a manner that the display cycle of the specific image displayed by the display device is set equal to an integer multiple of the flashing cycle of the intermittent illumination under the intermittent illumination which flashes periodically, based on the flashing cycle detected by the flashing cycle detecting device.

24. The control system as claimed in claim 22, wherein

the control device further comprises a flashing cycle control device which changes the flashing cycle of the intermittent illumination,

the flashing cycle control device controlling the flashing cycle of the intermittent illumination in such a manner that the display cycle of the specific image is set equal to an integer multiple of the flashing cycle of the intermittent illumination under the intermittent illumination which flashes periodically, based on the display cycle of the specific image.

25. The control system as claimed in claim 23, wherein

the flashing cycle detecting device comprises a flashing phase detecting device which detects the flashing phase of the intermittent illumination,

the display cycle control device comprises an image display starting point changing device which changes a display starting point of an image to be displayed,

the image display starting point changing device synchronizing the display starting point with the flashing phase detected by the flashing phase detecting device.

26. The control system as claimed in claim 25, wherein

the flashing cycle control device comprises a flashing phase changing device which changes the flashing phase of the intermittent illumination,

the flashing phase changing device synchronizing the flashing phase with the display starting point of the image to be displayed.

27. The control system as claimed in claim 24, wherein

the flashing cycle detecting device detects the flashing cycle or the flashing phase of the intermittent illumination from a waveform of AC voltage of commercial power source applied to the display device.

28. The control system as claimed in claim 24, wherein

the display cycle control device sets the display cycle of the specific image to be either one of 1/50 second or 1/100 second when the flashing cycle detected by the flashing cycle detecting device is 1/100 second, and sets the display cycle of the specific image to be either one of 1/60 second or 1/120 second when the flashing cycle detected by the flashing cycle detecting device is 1/120 second.

29. The control system as claimed in claim 24, wherein

the flashing cycle detecting device detects the flashing cycle or the flashing phase of the intermittent illumination by detecting a fluctuation in brightness of the intermittent illumination.

30. The control system as claimed in claim 24, wherein

the flashing cycle detecting device comprises a transmitted light detecting device which detects a fluctuation in light transmitted through the optical shutter, and detects a fluctuation in brightness of the intermittent illumination.

31. The control system as claimed in claim 26, comprising a display panel of reflection type or a transflective type, wherein

the image display starting point changing device changes the display starting point such that a value of integral of a transmitted light amount during an opening period of the optical shutter becomes a maximum based on a detection result of the flashing cycle detecting device.

32. The control system as claimed in claim 26, comprising a display panel of a transmission type, a transflective type, a projection type, or a light emitting type, wherein

the image display starting point changing device changes the display starting point such that a value of integral of a transmitted light amount during an opening period of the optical shutter becomes a minimum based on a detection result of the flashing cycle detecting device.

33. The control system as claimed in claim 27, comprising a display panel a reflection type or a transflective type, wherein

the flashing phase changing device changes the flashing phase such that a value of integral of a transmitted light amount during an opening period of the optical shutter becomes a maximum.

34. The control system as claimed in claim 27, comprising a display panel of a transmission type, a transflective type, a projection type, or a light emitting type, wherein

the flashing phase changing device changes the flashing phase such that a value of integral of a transmitted light amount during an opening period of the optical shutter becomes a minimum.

35. The control system as claimed in claim 32, wherein:

the flashing cycle detecting device comprises a transmitted light detecting device which detects a fluctuation in light transmitted through the optical shutter, and detects the brightness of the intermittent illumination.

36. The control system as claimed in claim 23, wherein

the display cycle control device limits the display cycle of the specific image to 1/50 second or less.

37. A specific image display method comprising:

controlling a display cycle of a specific image included in two or more types of images displayed sequentially and repeatedly and a flashing cycle of an intermittent illumination in such a manner that the display cycle of the specific image is set equal to an integer multiple of the flashing cycle of the intermittent illumination under the intermittent illumination which flashes periodically.

38. The specific image display method as claimed in claim 37, comprising:

detecting the flashing cycle of the intermittent illumination; and

controlling the display cycle of the specific image and a flashing cycle of an intermittent illumination in such a manner that the display cycle of the specific image displayed by the display device is set equal to an integer multiple of the flashing cycle of the intermittent illumination, based on the detected flashing cycle.

39. The specific image display method as claimed in claim 38, comprising:

detecting a flashing phase of the intermittent illumination; and

changing the display starting point of the image to be displayed, based on the detected flashing phase.

40. A computer readable recording medium storing an operation control program for controlling an optical shutter to open/close in synchronization with a display of a specific image included in two or more types of images to be displayed, causing a computer to execute a function of:

controlling a display cycle of the specific image and a flashing cycle of the intermittent illumination in such a manner that the display cycle of the specific image is set equal to an integer multiple of the flashing cycle of the intermittent illumination under the intermittent illumination which flashes periodically.

41. A display system which displays two or more types of images including a specific image sequentially and repeatedly by a display device under an intermittent illumination, comprising:

control means for controlling a display cycle of the specific image and a flashing cycle of the intermittent illumination in such a manner that the display cycle of the specific image is set equal to an integer multiple of the flashing cycle of the intermittent illumination under the intermittent illumination which flashes periodically.

42. A control system which controls sequential and repeated displays of two or more types of images including a specific image by a display device under an intermittent illumination, comprising:

control means for controlling a display cycle of the specific image and a flashing cycle of the intermittent illumination in such a manner that the display cycle of the specific image is set equal to an integer multiple of the flashing cycle of the intermittent illumination under the intermittent illumination which flashes periodically.