Infrared sensor integrated in a touch panel

• US 7,924,272 B2
• Filed: 11/27/2006
• Issued: 04/12/2011
• Est. Priority Date: 11/27/2006
• Status: Expired due to Fees

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Bathiche, Steven N., Izadi, Shahram, Hodges, Stephen Edward, Boer, Willem den
• Primary Examiner(s): Shalwala; Bipin
• Assistant Examiner(s): HEGARTY, KELLY B
• Application Number:
  US11/604,491
• Publication Number:
  US 20080121442A1
• Time in Patent Office: 1,597 Days
• Field of Search: 345156-158, 345/173, 345/175, 345/176, 715/702, 715/740, 178 1801- 1904, 434322-364, 315149-150
• US Class Current: 345/175
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: G06V 40/1318 using electro-optical elements or layers, e.g. electroluminescent sensing

Abstract

An infrared source is configured to illuminate the underside of one or more objects on or above a touchable surface of a touch panel. Infrared light reflected from the underside of the object(s) is detected by an infrared sensor integrated in the touch panel below the touchable surface.

Claims

1. A touch panel system comprising:

a display configured to display an image viewable via a touchable surface of the touch panel system;

at least one infrared source integrated in the touch panel system, the at least one infrared source configured to turn on in response to contact with the touchable surface and to direct infrared radiation towards and through the touchable surface for illuminating one or more objects that are in contact with or adjacent to the touchable surface with infrared radiation; and

a touch panel having integrated therein infrared sensors that are distributed throughout the touch panel parallel to the touchable surface, wherein;

the infrared sensors are sensitive to infrared radiation incident on the infrared sensors,

the infrared sensors are in an off state when infrared radiation is not incident on the infrared sensors,

one of more infrared sensors turn from the off state to an on state in response to infrared radiation directed by the at least one infrared source towards and through the touchable surface which is reflected from above the touchable surface by the one or more objects, and

detection of an infrared image based on output of the one or more infrared sensors does not conflict with the image visibly displayed on the display of the touch panel system.

2. The touch panel system of claim 1, further comprising:

a backlight arranged below the touch panel, wherein the backlight comprises the at least one infrared source and at least one visible light source.

3. The touch panel system of claim 1, further comprising:

a frontlight arranged above the touch panel, wherein the frontlight comprises the at least one infrared source, and the touchable surface comprises a surface of the frontlight.

4. The touch panel system of claim 1, wherein the display is a liquid crystal display.

5. The touch panel system of claim 1, wherein the display is an organic light emitting diode display.

6. The touch panel system of claim 5, wherein the infrared source is an organic light emitting diode.

7. The touch panel system of claim 5, wherein the infrared sensors comprise infrared-sensitive organic photosensors.

8. The touch panel system of claim 1, wherein the display has an active matrix backplane and the infrared sensors are integrated into the backplane.

9. The touch panel system of claim 1, wherein the infrared sensors comprise thin film transistors.

10. The touch panel system of claim 9, wherein at least one of the thin film transistors comprises:

a gate that is reflective to infrared radiation; and

a film that absorbs infrared radiation directed by the at least one infrared source towards and through the touchable surface which is reflected from above the touchable surface by the one or more objects and absorbs infrared radiation which is reflected from below the film by the reflective material.

11. The touch panel system of claim 1, wherein the infrared sensors comprise photodiodes.

20. The touch panel system of claim 1, wherein touch panel system is configured to identify locations of different game pieces that are in contact with the touchable surface, distinguish between the different game pieces, and alter the image visibly displayed on the display of the touch panel system based on the locations of the different game pieces.

12. A touch panel system comprising:

at least one infrared source integrated in the touch panel system, the at least one infrared source configured to turn on in response to contact with a touchable surface of the touch panel system and to direct infrared radiation towards and through the touchable surface for illuminating one or more objects that are in contact with or adjacent to the touchable surface with infrared radiation; and

a touch panel having integrated therein infrared sensors that are sensitive to infrared radiation incident on the infrared sensors, wherein;

the infrared sensors are distributed throughout the touch panel parallel to the touchable surface,

the infrared sensors are in an off state when infrared radiation is not incident on the infrared sensors,

one of more infrared sensors turn from the off state to an on state in response to infrared radiation directed by the at least one infrared source towards and through the touchable surface which is reflected from above the touchable surface by the one or more objects, and

each infrared sensor comprises a reflective material that is reflective to infrared radiation and a film that absorbs infrared radiation directed by the at least one infrared source towards and through the touchable surface which is reflected from above the touchable surface by the one or more objects and absorbs infrared radiation which is reflected from below the film by the reflective material.

13. The touch panel system of claim 12, wherein the film comprises a semiconductor material selected from the group consisting of:

mono-crystalline silicon, polycrystalline silicon, microcrystalline silicon, and nanocrystalline silicon.

14. The touch panel system of claim 12, wherein the film comprises a non-silicon-based semiconductor material.

15. The touch panel system of claim 12, wherein the touch panel comprises a display configured to display images that are viewable via the touchable surface.

16. A touch panel system comprising:

at least one infrared source integrated in the touch panel system, the at least one infrared source configured to turn on in response to contact with a touchable surface of the touch panel system and to direct infrared radiation towards and through the touchable surface for illuminating one or more objects that are in contact with or adjacent to the touchable surface of the touch panel system with infrared radiation;

a touch panel having integrated therein infrared sensors that are distributed throughout the touch panel parallel to the touchable surface, wherein;

the infrared sensors are sensitive to infrared radiation incident on the infrared sensors,

the infrared sensors are in an off state when infrared radiation is not incident on the infrared sensors,

one of more infrared sensors turn from the off state to an on state in response to infrared radiation directed by the at least one infrared source towards and through the touchable surface which is reflected from above the touchable surface by the one or more objects,

the touch panel comprises a display configured to display images that are viewable via the touchable surface, and

the display comprises an infrared-transmitting and visible-light absorbing filter between the touchable surface and the one or more infrared sensors for shielding the one or more infrared sensors from visible light when detecting the infrared radiation which is reflected from above the touchable surface by the one or more objects.

17. The touch panel system of claim 16, wherein the filter comprises an infrared-transmitting polymer black matrix.

18. The touch panel system of claim 16, wherein the filter comprises a red color filter overlapping a blue color filter.

19. The touch panel system of claim 16, wherein the display is a liquid crystal display.