Display panel

• US 8,508,710 B2
• Filed: 12/02/2004
• Issued: 08/13/2013
• Est. Priority Date: 12/02/2004
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Huddleston, Wyatt A., Blythe, Michael M., Blythe, Gregory W.
• Primary Examiner(s): Newman, Michael A
• Application Number:
  US11/001,901
• Publication Number:
  US 20060119798A1
• Time in Patent Office: 3,176 Days
• Field of Search: 382/106, 382/107, 382/218, 382/221, 382/291, 345/9, 345/173, 345/175, 345/182, 353/28, 356390-397
• US Class Current: 352/106
• CPC Class Codes: G06F 3/0425 using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected tracking a projected light spot to determine a position on a display surface G06F3/0386
• CPC Class Codes: H04N 5/74 Projection arrangements for image reproduction, e.g. using eidophor

Abstract

In accordance with one embodiment of the present disclosure, a difference is detected between a first image and a second image. The second image can include at least a portion of the first image reflected from a display panel and light from an object passing through the display panel.

Claims

1. A method, comprising:

generating a first image on a first side of a display panel using visible light, a reflected portion of the first image being reflected from the first side of the display panel, a displayed portion of the first image being passed through the display panel and user-viewable on a second side of the display panel;

receiving light from an object located on a second side of the display panel;

capturing a second image comprising at least a portion of the reflected portion of the first image and at least a portion of the received light; and

detecting a difference between the first image and the second image.

2. The method of claim 1, wherein:

the object is in proximity with the second side of the display panel.

3. The method of claim 1, wherein the received light is emitted from the object.

4. The method of claim 1, wherein the difference between the first image and the second image is a representation of at least a portion of the object.

5. The method of claim 1, wherein the first image is produced from a first image file, the method further comprising generating a second image file from the second image.

6. The method of claim 5, wherein detecting the difference between the first image and the second image comprises detecting a difference between the first image file and the second image file.

7. The method of claim 6, wherein detecting the difference between the first image file and the second image file comprises comparing a portion of the first image file to a corresponding portion of the second image file.

8. The method of claim 6, wherein:

the first image file comprises a plurality of first pixels;

the second image file comprises a plurality of second pixels; and

detecting the difference between the first image file and the second image file comprises detecting a difference between a first pixel and a corresponding second pixel.

9. The method of claim 6, wherein:

the first image file comprises a plurality of first pixels;

the second image file comprises a plurality of second pixels; and

detecting the difference between the first image file and the second image file comprises detecting a difference between a group of the first pixels and a corresponding group of the second pixels.

10. The method of claim 9, wherein:

the group of first pixels is a line of first pixels; and

the group of second pixels is a line of second pixels.

11. The method of claim 9, wherein:

the group of first pixels is an array of first pixels; and

the group of second pixels is an array of second pixels.

12. The method of claim 6, further comprising:

capturing a third image that comprises at least a second portion of the reflected portion of the first image and at least a second portion of the received light from the object, wherein the third image is subsequent to the second image;

generating a third image file from the third image; and

detecting a second difference between the second image file and the third image file, wherein the second difference is a representation of at least a portion of the object.

13. The method of claim 12, wherein the second difference is a representation of a change in position of the object relative to the display panel.

55. The method of claim 1, wherein the received light is reflected by the object.

56. The method of claim 1, wherein the received light originates from an external light source on the second side of the display panel.

57. The method of claim 1, wherein the first image comprises a plurality of pixels, wherein each pixel of the plurality of pixels is individually controllable to adjust an intensity of the pixel.

14. A method, comprising:

projecting, using visible light, a first image onto a first side of a display panel, a reflected portion of the first image being reflected from the first side of the display panel, a displayed portion of the first image being passed through the display panel and user-viewable on a second side of the display panel;

at a first point in time, capturing a second image that comprises at least a portion of the reflected portion of the first image and light transmitted from an object in proximity with a second side of the display panel;

at a second point in time, capturing a third image that comprises at least a portion of the reflected portion of the first image as well as light transmitted from the object, wherein the third image is subsequent to the second image; and

,

detecting a difference between the second image and the third image, wherein the difference is a representation of at least a portion of the object.

15. The method of claim 14, further comprising:

generating a first image file from the second image; and

generating a second image file from the third image, wherein detecting the difference between the second image and the third image comprises detecting a difference between the first image file and the second image file.

16. The method of claim 15, wherein:

the first image file comprises a plurality of first pixels;

the second image file comprises a plurality of second pixels; and

detecting the difference between the first image file and the second image file comprises detecting a difference between a group of one or more of the first pixels and a corresponding group of one or more of the second pixels.

58. The method of claim 14, wherein the light transmitted from the object originates from the second side of the display panel.

17. A method of detecting the presence of an object, the method comprising:

generating, from a first image file, a first image on a first side of a display panel using visible light, a reflected portion of the first image being reflected from the first side of the display panel, a displayed portion of the first image passing through the display panel and viewable by a user on a second side of the display panel;

receiving light from an object located on a second side of the display panel;

capturing a second image comprising at least a portion of the reflected portion of the first image and at least a portion of the received light;

generating a second image file from the second image; and

detecting a difference between the first image and the second image by comparing the first image file and the second image file.

18. The method of claim 17, wherein the object is in proximity with the second side of the display panel.

19. The method of claim 17, wherein the received light is emitted from the object.

20. The method of claim 17, wherein the difference between the first image and the second image is a representation of at least a portion of the object.

21. The method of claim 20, further comprising analyzing the difference, representing at least a portion of the object, to determine at least one characteristic of the object.

22. The method of claim 20, further comprising:

generating a first file containing the representation of the at least a portion of the object using the difference; and

,

comparing the representation to a second file containing a list of object characteristics.

23. The method of claim 22, further comprising identifying a match between the representation and at least one object characteristic contained in the list.

24. The method of claim 23, further comprising performing an operation in response to identifying the match.

25. The method of claim 21, wherein the at least one characteristic of the object is a position of the object relative to the display panel.

26. The method of claim 25, wherein the position of the object is an orientation of the object relative to the display panel.

27. The method of claim 25, wherein the position of the object is a location of the object relative to the display panel.

28. The method of claim 21, wherein the at least one characteristic is a velocity of the object relative to the display panel.

29. The method of claim 21, wherein the at least one characteristic is a type of object.

30. The method of claim 21, wherein the at least one characteristic is a visual feature of the object.

31. The method of claim 21, further comprising transmitting data to the object in response to determining at least one characteristic of the object.

32. The method of claim 31, wherein transmitting data comprises optically transmitting data through the display panel.

33. A non-transitory machine-readable medium, the machine-readable medium having stored thereon computer executable instructions to:

project a first image on a first side of a display panel using visible light, a reflected portion of the first image being reflected from the first side of the display panel, a displayed portion of the first image being passed through the display panel and user-viewable on a second side of the display panel;

generate a second image by capturing at least a portion of the reflected portion of the first image and at least a portion of light received from an object located on the second side of the display panel; and

detect a difference between the first image and the second image.

34. The non-transitory machine-readable medium of claim 33, wherein the object is proximate with the second side of the display panel.

35. The non-transitory machine-readable medium of claim 33, wherein the received light is emitted from the object.

36. The non-transitory machine-readable medium of claim 33 storing further instructions to define the difference as a representation of at least a portion of the object.

37. The non-transitory machine-readable medium of claim 36 storing further instructions to:

compare the representation to a list of object characteristics; and

,

identify at least one characteristic of the object in response to comparing the representation to the list.

38. The non-transitory machine-readable medium of claim 37 storing further instructions to update the first image in response to identifying at least one characteristic.

59. The non-transitory machine-readable medium of claim 33, wherein the received light originates from an external light source on the second side of the display panel, and wherein the received light is reflected by the object.

39. A system, comprising:

an imager to project a first image on a first side of a display panel using visible light, a reflected portion of the first image being reflected from the first side of the display panel, a displayed portion of the first image being passed through the display panel and user-viewable on a second side of the display panel;

an optical receiver configured to capture a second image that comprises at least a portion of the reflected portion of the first image and light received from an object located on the second side of the display panel; and

a controller configured to determine a difference between the first image and the second image.

40. The system of claim 39, further comprising a controller with which the imager is communicatively linked.

41. The system of claim 39, further comprising the display panel onto which the imager is to project the first image.

42. The system of claim 39, further comprising a controller with which the optical receiver is communicatively linked.

43. The system of claim 42, further comprising a computer readable medium containing a series of computer executable instructions which are accessible by the controller and which are configured to detect the difference between the first image and the second image.

44. The system of claim 43, wherein the computer executable instructions are further configured to recognize the difference as a representation of at least a portion of the object.

45. The system of claim 44, wherein the computer executable instructions are further configured to:

compare the representation to a list of object characteristics; and

,

identify at least one characteristic of the object in response to comparing the representation to the list.

46. The system of claim 45, wherein the computer executable instructions are further configured to perform an operation in response to identifying at least one characteristic of the object.

47. The system of claim 43, wherein the computer executable instructions are further configured to detect a difference between the second image and a third image that comprises at least a portion of the reflected portion of the first image as well as light received from the object, wherein the third image is subsequent to the second image.

48. The system of claim 47, wherein the computer executable instructions are further configured to recognize the difference between the second image and the third image as a property of the object.

49. The system of claim 48, wherein the property of the object is selected from the group consisting of:

a change in position of the object relative to the display panel; and

,

a velocity of the object relative to the display panel.

50. The system of claim 45, wherein the computer executable instructions are further configured to cause data to be sent to the object in response to identifying at least one characteristic of the object.

51. The system of claim 50, wherein causing data to be sent to the object comprises causing the imager to optically transmit data to the object through the display panel.

60. The system of claim 39, wherein the received light originates from an external light source on the second side of the display panel, and wherein the received light is reflected by the object.

52. An apparatus, comprising:

a means for projecting a first image onto a first side of a display panel using visible light, a reflected portion of the first image being reflected from the first side of the display panel, a displayed portion of the first image being passed through the display panel and user-viewable on a second side of the display panel;

a means for capturing a second image that comprises at least a portion of the reflected portion of the first image as well as light received from an object in proximity with a second side of the display panel; and

a means for detecting a difference between the first image and the second image, wherein the difference is a representation of at least a portion of the object.

53. The apparatus of claim 52, wherein the first image is produced from a first image file, the apparatus further comprising a means for producing a second image file from the second image.

54. The apparatus of claim 53, wherein the means for detecting a difference comprises a means for detecting a difference between the first image file and the second image file.

61. The apparatus of claim 52, wherein the received light originates from an external light source on the second side of the display panel, and wherein the received light is reflected by the object.