Touch-Sensitive Display

• US 20100177060A1
• Filed: 01/14/2010
• Published: 07/15/2010
• Est. Priority Date: 01/14/2009
• Status: Abandoned Application

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Perceptive Pixel Incorporated (Microsoft Corporation)
• Inventors: Han, Jefferson Y.
• Application Number:
  US12/687,828
• Publication Number:
  US 20100177060A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 2203/04108 Touchless 2D- digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface without distance measurement in the Z direction
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

A display system is configured to generate output display images. In addition, the display system includes a touch-sensitive sensing system and a photo-sensitive sensing system configured to sense light directed to the photo-sensitive sensing system and generate an output representation of the sensed light directed to the photo-sensitive sensing system.

Claims

1. A touch-sensitive display device, comprising:

a display system configured to generate substantially planar output display images;

a capacitive touch-sensitive sensing system that includes one or more electrodes disposed in one or more planes that are substantially parallel to the plane in which output display images are displayed, the capacitive touch-sensitive sensing system being configured to change one or more capacitances associated with one or more of the electrodes in response to a change in relative position between an input mechanism and the touch-sensitive display device and the capacitive touch-sensitive sensing system being configured to generate an output representation of the one or more capacitances associated with the one or more electrodes; and

a photo-sensitive sensing system configured to sense light directed to the photo-sensitive sensing system and generate an output representation of the sensed light directed to the photo-sensitive sensing system, the touch-sensitive display device being configured to;

identify changes in capacitances associated with the one or more electrodes based on output representations of the capacitances associated with the one or more electrodes generated by the capacitive touch-sensitive sensing system;

detect one or more identified changes in capacitances associated with the one or more electrodes; and

in response to detecting the one or more identified changes in capacitances, adapt parameters of the photo-sensitive sensing system to facilitate observation, within output representations of the sensed light directed to the photo-sensitive sensing system generated by the photo-sensitive sensing system, of effects on the light directed to the photo-sensitive sensing system that occur when the one or more identified changes in capacitances are detected.

2. The device of claim 1, wherein the display system includes a planar array of light emitting elements configured to generate the output display images, and wherein the capacitive touch-sensing system includes a planar layer oriented parallel to the array of light emitting elements, the one or more electrodes being positioned on a common surface of the planar layer, and the layer being configured to transmit at least a portion of light emitted by the light emitting elements.

3. A touch-sensitive display device, comprising:

a light emitting layer including light emitting elements configured to generate an output display image and light detecting elements;

a capacitive touch-sensitive layer including one or more electrodes;

driving circuitry for driving the light emitting elements to generate an output display image; and

one or more electronic processing elements configured to;

identify output received from one or more of the light detecting elements;

identify output received from at least one of the electrodes; and

based on at least one of the identified outputs, determine a position of an input mechanism in proximity to the touch-sensitive display device.

4. The device of claim 3, wherein the light detecting elements include photodiodes.

5. The device of claim 3, wherein the light detecting elements include elements each of which is configured as a multilayer semiconductor device.

6. The device of claim 3, wherein the capacitive touch-sensitive layer forms a projective capacitive touch-sensitive layer.

7. The device of claim 3, wherein the light emitting elements are configured to emit light in a visible region of the electromagnetic spectrum during operation of the device.

8. The device of claim 3, wherein the light emitting elements are configured to emit light in an infrared region of the electromagnetic spectrum during operation of the device.

9. The device of claim 3, wherein the light emitting layer is segmented into a plurality of pixels, each pixel including at least one light emitting element.

10. The device of claim 9, wherein at least some of the pixels include at least one light detecting element.

11. The device of claim 3, wherein the capacitive touch-sensitive layer includes a common electrode spaced from each of the one or more electrodes.

12. The device of claim 11, wherein the one or more electronic processing elements configured to determine the position of the input mechanism in proximity to the touch-sensitive display device include an electronic processing element configured to detect relative changes in an electrical potential difference between at least one of the electrodes and the common electrode during operation of the device.

13. The device of claim 12, wherein the one or more electronic processing elements configured to determine the position of the input mechanism in proximity to the touch-sensitive display device include an electronic processing element configured to determine the position of the input mechanism in proximity to the touch-sensitive display device as a consequence of having detected a relative change in the electrical potential difference between the at least one electrode and the common electrode during operation of the device.

14. The device of claim 3, wherein the one or more electronic processing elements configured to determine the position of the input mechanism in proximity to the touch-sensitive display device include an electronic processing element configured to:

detect changes in capacitive coupling associated with at least one of the electrodes; and

determine the position of the input mechanism in proximity to the touch-sensitive display device as a consequence of having detected a change in at least one capacitive coupling associated with at least one of the electrodes.

15. The device of claim 3, wherein the one or more electronic processing elements configured to determine the position of the input mechanism in proximity to the touch-sensitive display device include an electronic processing element configured to:

detect relative changes in amounts of ambient light incident on one or more of the light detecting elements based on output received from one or more light detecting elements; and

determine the position of the input mechanism in proximity to the touch-sensitive display device as a consequence of having detected a relative change in an amount of ambient light incident on one or more of the light detecting elements.

16. The device of claim 15, wherein the one or more electronic processing elements configured to determine the position of the input mechanism in proximity to the touch-sensitive display device include an electronic processing element configured to:

detect relative changes in amounts of ambient light incident on particular light detecting elements based on output received from the particular light detecting elements; and

determine a shape of a surface of the input mechanism in proximity to the touch-sensitive display device based on the particular light detecting elements for which relative changes in amounts of incident ambient light were detected.

17. The device of claim 3, wherein the one or more electronic processing elements configured to determine the position of the input mechanism in proximity to the touch-sensitive display device include an electronic processing element configured to:

detect changes in at least one electric field associated with at least one of the electrodes; and

determine the position of the input mechanism in proximity to the touch-sensitive display device as a consequence of having detected a relative change in at least one electric field associated with at least one of the electrodes.

18. The device of claim 17, wherein:

the light emitting layer is segmented into a plurality of pixels, each pixel including at least one light emitting element;

the electronic processing element configured to determine the position of the input mechanism in proximity to the touch-sensitive display device is further configured to identify one or more pixels of the light emitting layer that are overlaid by the input mechanism based on

the detected relative change in at least one electric field associated with at least one electrode; and

the one or more processing elements are further configured to control the driving circuitry to cause at least some of the light emitting elements corresponding to the one or more pixels of the light emitting layer determined to be overlaid by the input mechanism to emit increased amounts of light.

19. The device of claim 18, wherein the one or more processing elements are configured to detect light reflected from the input mechanism by detecting light using light detectors corresponding to at least some of the pixels of the light emitting layer that are overlaid by the input mechanism.

20. The device of claim 19, wherein the one or more processing elements are configured to measure a spatial distribution of reflected light intensity corresponding to the pixels of the light emitting layer that are overlaid by the input mechanism.

21. The device of claim 20, wherein the one or more processing elements are configured to determine a spatial distribution of reflected light peaks from the distribution of reflected light intensity.

22. The device of claim 21, wherein the one or more processing elements are configured to identify the input mechanism based on the spatial distribution of reflected light peaks.

23. The device of claim 19, wherein the one or more processing elements are configured to make multiple light intensity measurements at a first measurement frequency f₁ using light detectors that correspond to at least some of the pixels of the light emitting layer that are overlaid by the input mechanism, and wherein the one or more processing elements are configured to make multiple light intensity measurements at a second measurement frequency f₂ less than f₁ using light detectors that correspond to pixels that are not overlaid by the input mechanism.

24. The device of claim 22, wherein the one or more processing elements are configured to determine the position of the input mechanism relative to the light emitting layer based on the reflected light peaks.

25. The device of claim 22, wherein the one or more processing elements are configured to determine an orientation of the input mechanism relative to the light emitting layer based on the reflected light peaks.

26. The device of claim 24, wherein the one or more processing elements are configured to repeatedly determine the position of the input mechanism relative to the light emitting layer as the input mechanism is translated across a surface of the capacitive touch-sensitive layer.

27. The device of claim 26, wherein the one or more processing elements are configured to adjust pixels of the light emitting layer based on the determinations of the input mechanism'"'"'s position, and wherein adjusting the pixels includes at least one of adjusting an amount of light transmitted by light emitting elements corresponding to one or more pixels of the light emitting layer, and adjusting an amount of light generated by light emitting elements corresponding to one or more pixels of the light emitting layer.

28. The device of claim 9, wherein each of the pixels includes at least one light detecting element.

29. The device of claim 9, wherein each of the pixels includes at least one cell of liquid crystal material.

30. The device of claim 3, wherein the light emitting elements are organic light emitting diodes.

31. The device of claim 9, wherein each of the pixels in the light emitting layer corresponds to at least one of the electrodes in the capacitive touch-sensitive layer.

32. A method of operating a touch-sensitive display device that includes a capacitive touch-sensitive layer having one or more electrodes, a light emitting layer having light emitting elements, and one or more light detecting elements, the method comprising:

monitoring one or more electric fields associated with one or more of the electrodes of the capacitive touch-sensitive layer;

based on monitoring the one or more electric fields associated with one or more of the electrodes of the capacitive touch-sensitive layer, identifying at least one change to at least one electric field associated with at least one of the one or more electrodes of the capacitive touch-sensitive layer;

as a consequence of having identified at least one change to at least one electric field associated with at least one of the one or more electrodes of the capacitive touch-sensitive layer, determining a position of the input mechanism relative to the light emitting layer based on the one or more electrodes of the capacitive touch-sensitive layer for which changes to the electric fields associated with the one or more electrodes were identified;

increasing an intensity of light emitted by one or more of the light emitting elements of the light emitting layer located in positions within the light emitting layer that correspond to the determined position of the input mechanism relative to the light emitting layer;

receiving, from one or more of the light detecting elements, input conveying information about light that is incident on the one or more light detecting elements; and

monitoring light reflected from the input mechanism based on the received input from the one or more light detecting elements.

33. The method of claim 32, wherein increasing an intensity of light emitted by one or more of the light emitting elements includes identifying regions of the light emitting layer that are overlaid by the input mechanism, and increasing the intensity of light emitted from light emitting elements that correspond to the overlaid regions.

34. The method of claim 32, further including adjusting a wavelength of light emitted from light emitting elements that correspond to the one or more of the light emitting elements of the light emitting layer located in positions that correspond to the determined position of the input mechanism.

35. The method of claim 32, further including identifying the input mechanism based on the light reflected from the input mechanism.

36. The method of claim 35, wherein identifying the input mechanism includes determining a spatial distribution of reflected light intensity from the input mechanism, determining positions of peaks in the spatial distribution of reflected light intensity, and identifying the input mechanism based on the peak positions.

37. The method of claim 36, wherein identifying the input mechanism includes determining shapes of one or more peaks in the spatial distribution of reflected light intensity, and identifying the input mechanism based on the peak shapes.

38. The method of claim 36, further including determining an orientation of the input mechanism based on the peak positions.

39. The method of claim 32, further including repeating the monitoring of one or more electric fields associated with the one or more of the electrodes of the capacitive touch-sensitive layer to determine the position of the input mechanism as the input mechanism is translated relative to the capacitive touch-sensitive layer.

40. The method of claim 37, wherein the light emitting layer is segmented into a plurality of pixels, the method further including identifying one or more pixels overlaid by the input mechanism, and adjusting one or more of the overlaid pixels based on the identity of the input mechanism.

41. The method of claim 40, wherein adjusting one or more of the overlaid pixels includes adjusting at least one of a wavelength and an intensity of light emitted by one or more of the overlaid pixels when the input mechanism no longer overlays the pixels.

42. The method of claim 33, further including repeating the receiving input from one or more of the light detecting elements and monitoring light reflected from the input mechanism, wherein the receiving includes receiving input from one or more light detecting elements that correspond to the overlaid regions at a first frequency f_l, and receiving input from one or more light detecting elements that do not correspond to the overlaid regions at a second frequency f₂ less than f₁.

43. The method of claim 36, further including determining a position of the input mechanism relative to the light emitting layer based on the received input from the one or more of the light detecting elements.

44. A display device, comprising:

a display apparatus including light emitting elements and light detecting elements;

a touch-sensitive sensor layer configured to transmit light emitted by the light emitting elements; and

an electronic processing element coupled to the display apparatus and the touch-sensitive layer,

wherein the electronic processing element is configured to;

receive input from the sensor layer;

determine a position of an input mechanism in proximity to the device based on the input received from the sensor layer; and

adjust an operating parameter of the display apparatus based on the position of the input mechanism.

45. The device of claim 44, wherein the touch-sensitive sensor is a projected capacitive sensor.

46. The device of claim 44, wherein the touch-sensitive sensor is a resistive sensor.

47. The device of claim 44, wherein the touch-sensitive sensor is a surface capacitive sensor.

48. The device of claim 44, wherein the touch-sensitive sensor includes a waveguide layer, and wherein the sensor is configured to detect contact by an object by measuring radiation that leaves the waveguide layer when the object contacts the sensor.

49. The device of claim 44, wherein adjusting the operating parameter includes adjusting an emission wavelength of at least some of the light emitting elements.

50. The device of claim 44, wherein adjusting the operating parameter includes adjusting an intensity of light emitted by at least some of the light emitting elements.

51. The device of claim 44, wherein adjusting the operating parameter includes activating one or more additional light emitting elements in the display apparatus.

52. The device of claim 44, wherein the electronic processing element is further configured to:

determine a region of the display apparatus overlaid by the input mechanism;

direct radiation from at least some of the light emitting elements in the overlaid region to be incident on the input mechanism; and

measure radiation reflected from the input mechanism using at least some of the light detecting elements in the overlaid region.

53. The device of claim 52, wherein the electronic processing element is further configured to measure a spatial distribution of reflected light from the input mechanism, and to identify the input mechanism based on the distribution.

54. The device of claim 52, wherein adjusting the operating parameter includes at least one of adjusting a measurement rate and an integration time associated with the at least some of the light detecting elements in the overlaid region.

55. The device of claim 44, wherein the input includes at least one electrical signal that includes information about a change in a capacitive coupling associated with one or more regions of the sensor layer.

56. The device of claim 44, wherein the input includes at least one electrical signal that includes information about a change in an electric field associated with one or more regions of the sensor layer.