Interactive display using planar radiation guide

• US 7,548,677 B2
• Filed: 10/12/2006
• Issued: 06/16/2009
• Est. Priority Date: 10/12/2006
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Bathiche, Stephen N., Silverstein, Dana Lu
• Primary Examiner(s): Alavi; Ali
• Application Number:
  US11/549,010
• Publication Number:
  US 20080089090A1
• Time in Patent Office: 978 Days
• Field of Search: 362/600, 362/606, 362/612, 362/561, 385/129, 385/901
• US Class Current: 385/129
• CPC Class Codes: G02B 6/0046 Tapered light guide, e.g. wedge-shaped light guide
• CPC Class Codes: G02B 6/0051 Diffusing sheet or layer
• CPC Class Codes: G02B 6/0053 Prismatic sheet or layer; Brightness enhancement element, sheet or layer
• CPC Class Codes: G06F 2203/04109 FTIR in optical digitiser, i.e. touch detection by frustrating the total internal reflection within an optical waveguide due to changes of optical properties or deformation at the touch location
• 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

Abstract

An interactive display that uses a planar radiation guide (such as a planar light guide) to perform display and/or imaging. The planar radiation guide has a radiation propagation portion and a radiation interface portion. The radiation propagation portion propagates the radiation by the principles of total internal reflection (with perhaps some minor leakage). The planar radiation guide also has a radiation interface portion where radiation is more apt to exit or enter the planar radiation guide. The interactive display performs both display and imaging, while the planar radiation guide is used to perform at least one (but perhaps both) of the display and imaging operations.

Claims

1. A method for using an interactive display that includes a planar radiation guide having a radiation propagation portion and a radiation interface portion, the radiation interface portion being of non-uniform thickness, a display mechanism structured to display at the area of the radiation interface portion, and an imaging mechanism structured to image at the area of the radiation interface portion using a backlight and a camera, the method comprising:

acts of placing an object in contact with or in front of the radiation interface portion of the planar radiation guide, illuminating the object with the backlight, and interpreting light reflected by the object with the camera; and

an act of interpreting an image that is displayed from the radiation interface portion of the planar radiation guide.

2. An interactive display comprising:

a planar radiation guide having a radiation propagation portion and a radiation interface portion, the radiation interface portion being of non-uniform thickness;

a display mechanism for outputting radiation from the area of the radiation interface portion;

an imaging mechanism for capturing radiation received at the area of the radiation interface portion,

wherein the interactive display is structured such that at least one of the display mechanism or the camera mechanism uses the planar radiation guide

such that the display mechanism uses the radiation propagation portion to propagate radiation to be displayed and emits at least a portion of such propagated radiation from the radiation interface portion if the display mechanism uses the planar radiation guide, and

such that the imaging mechanism uses the radiation interface portion to receive radiation and propagates at least a portion of such received radiation down the radiation propagation portion if the imaging mechanism uses the planar radiation guide.

3. The interactive display in accordance with claim 2, the imaging mechanism comprising:

a backlight source configured to project backlight into the radiation propagation portion of the planar radiation guide; and

a camera positioned at the edge of the radiation propagation portion next to the backlight source.

4. The interactive display claim 2, wherein the imaging mechanism uses a backlight positioned below the radiation interface portion of the planar radiation guide, the backlight configured to pass light through the radiation interface portion such that the passed light is emitted from the upper surface of the radiation interface portion.

5. The interactive display of claim 4, wherein the planar radiation guide is a first planar radiation guide, and the backlight comprises a second planar radiation guide.

6. The interactive display of claim 4, wherein the interactive display is structured such that the display mechanism, but not the imaging mechanism, uses the planar radiation guide, the interactive display further comprising:

an array of cameras positioned below the radiation interface portion.

7. The interactive display of claim 4, further comprising:

a privacy film at the lower end of the radiation interface portion of the display.

8. The interactive display of claim 2, wherein the interactive display is structured such that both of the display mechanism and the imaging mechanism use the planar optical radiation guide.

9. The interactive display of claim 8, further comprising:

a projector positioned at the edge of the planar propagation portion; and

a camera positioned at the edge of the planar propagation portion.

10. The interactive display of claim 2, wherein the interactive display is structured such that only one of the display mechanism and the imaging mechanism uses the planar radiation guide.

11. The interactive display of claim 10, wherein the interactive display is structured such that the display mechanism, but not the imaging mechanism, uses the planar radiation guide.

12. The interactive display of claim 11, further comprising:

a projector positioned at the edge of the planar propagation portion.

13. The interactive display of claim 10, wherein the interactive display is structured such that the imaging mechanism, but not the display mechanism, uses the planar radiation guide.

14. The interactive display of claim 13, further comprising:

a camera positioned at an edge of the planar propagation portion.

15. The interactive display of claim 13, wherein the display mechanism comprises:

a display layer disposed above the radiation interface portion of the planar radiation guide.

16. The interactive display of claim 13, wherein the display mechanism comprises:

a display layer disposed below the radiation interface portion of the planar radiation guide.

17. The interactive display of claim 2, wherein the radiation propagation portion is configured to propagate at least visible light.

18. The interactive display of claim 2, wherein the radiation propagation portion is configured to propagate at least infrared light.