SENSOR-IN-PIXEL DISPLAY SYSTEM WITH NEAR INFRARED FILTER

• US 20130229357A1
• Filed: 03/01/2012
• Published: 09/05/2013
• Est. Priority Date: 03/01/2012
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Powell, Karlton D., Dighde, Rajesh Manohar
• Granted Patent: US 8,749,529 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• 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 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: Y10T 29/49826 Assembling or joining

Abstract

A display system includes both a cover panel and a display panel. The display panel includes multiple display pixels and multiple sensor elements configured to detect infrared light reflected from an object touching or close to the cover panel. The filter layer is configured to increase rejection of near infrared light reflected from the object prior to detection of the infrared light by the multiple sensor elements. The filter layer can be positioned in different locations, such as between the display panel and the cover panel, within the display panel, or within or on top of the cover panel.

Claims

1. A display system comprising:

a cover panel;

a display panel including both multiple display pixels and multiple sensor elements configured to detect infrared light reflected from an object within a threshold distance of a display surface of the cover panel; and

a filter layer configured to increase, prior to detection of the infrared light by the multiple sensor elements, rejection of near infrared light from ambient lighting or reflected from the object.

2. A display system as recited in claim 1, the filter layer being positioned between the display panel and the cover panel, and the filter layer being further configured to reduce rejection of both viewable light and infrared light.

3. A display system as recited in claim 2, the filter layer comprising a patterned filter patterned to have portions of the filter layer above the multiple sensor elements reject near infrared light, and other portions of the filter layer not above the multiple sensor elements not reject near infrared light.

4. A display system as recited in claim 2, the filter layer comprising a blanket filter with all portions of the filter layer having approximately the same light absorption and reflection characteristics.

5. A display system as recited in claim 2, the filter layer comprising a film having one or more light absorbing dyes screen-printed on a bottom side of the cover panel.

6. A display system as recited in claim 2, the filter layer comprising a polymer substrate on which one or more light absorbing dyes are screen-printed, the polymer substrate being affixed to a bottom side of the cover panel, and the cover panel being affixed to the display panel.

7. A display system as recited in claim 2, the filter layer comprising a polymer or inorganic coating compounded with one or more light absorbing dyes to form sheet media, the sheet media being affixed to a bottom side of the cover panel, and the cover panel being affixed to the display panel.

8. A display system as recited in claim 2, the filter layer comprising an adhesive mixed with one or more light absorbing dyes, the adhesive affixing the cover panel to the display panel.

9. A display system as recited in claim 2, the near infrared light comprising light having wavelengths between 680 nm and 810 nm.

10. A display system as recited in claim 2, the viewable light comprising light having wavelengths between 400 nm and 680 nm.

11. A display system as recited in claim 2, the filter layer rejecting near infrared light in a range of wavelengths to which the multiple sensor elements respond.

12. A display system as recited in claim 1, the filter layer being included in the display panel and being patterned to increase rejection of at least near infrared light above the multiple sensor elements in a layer of the display panel but not above other areas of the layer of the display panel.

13. A display system as recited in claim 12, the filter layer rejecting light other than at least infrared light in ranges of wavelengths to which the multiple sensor elements respond.

14. A display system as recited in claim 1, the filter layer being included as at least part of the cover panel.

15. A display system as recited in claim 14, the filter layer being included as at least part of a removable cover sheet that is part of the cover panel.

16. A method implemented in a display system, the method comprising:

transmitting, from one or more infrared light sources, infrared light through a filter layer and a cover panel of the display system; and

receiving, at one or more sensor elements in display pixels of a display panel of the display system, infrared light reflected from an object within a threshold distance of a display surface of the cover panel, the filter layer being configured to increase rejection of both near infrared light reflected from the object and near infrared ambient light prior to receiving the infrared light by the one or more sensor elements.

17. A method as recited in claim 16, the filter layer being positioned between the display panel and the cover panel, and the filter layer being further configured to reduce rejection of both viewable light and infrared light.

18. A method as recited in claim 16, the filter layer being included in the display panel and being patterned to increase rejection of near infrared light above the one or more sensor elements in a layer of the display panel but not above other areas of the layer of the display panel.

19. A method as recited in claim 16, the filter layer rejecting near infrared light in a range of wavelengths to which the one or more sensor elements respond.

20. A method of generating a display system by a manufacturing system, the method comprising:

obtaining a cover panel;

obtaining a display panel including both multiple display pixels and multiple sensor elements configured to detect infrared light reflected from an object within a threshold distance of the cover panel;

obtaining a filter layer configured to reduce rejection of both viewable light and infrared light, and to increase rejection of near infrared light, the near infrared light having wavelengths between 680 nm and 810 nm, the filter layer comprising a blanket filter with all portions of the filter layer having approximately the same light absorption and reflection characteristics; and

affixing, by the manufacturing system, the cover panel to the display panel with the filter layer positioned between the display panel and the cover panel.