Sensing display

• US 7,417,627 B2
• Filed: 10/27/2004
• Issued: 08/26/2008
• Est. Priority Date: 10/27/2004
• Status: Active Grant

• Current Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Original Assignee: Eastman Kodak Company
• Inventors: Cok, Ronald S.
• Primary Examiner(s): Patel; Nitin
• Application Number:
  US10/974,076
• Publication Number:
  US 20060098004A1
• Time in Patent Office: 1,399 Days
• Field of Search: 345156-173, 178/18.01, 178/18.07, 178/18.02, 178/18.03, 200/512, 200/310, 428/212, 428/690, 428/402, 428/403, 428/213, 428/304.4, 738/62
• US Class Current: 345/173
• 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

Abstract

A display and method for making the same are provided that can sense a force applied thereto. The display comprises a substrate, an array of individually controllable image-forming elements arranged on the substrate; and a support located proximate to the substrate. The support has an arrangement of light paths formed therein to transmit light from a light source to a light sensor. The light paths are arranged in an area that is, at least in part, co-extensive with the array. The support is elastically deformable so that an application of force to the support causes the light paths to deform in a manner that reduces the portion of light passing through light paths elastically deformed by the application of force.

Claims

1. A display comprising:

a substrate having an image-forming area;

an array of individually controllable image-forming elements arranged on the image-forming area; and

a support located proximate to the substrate, the support having an arrangement of light paths formed therein to transmit light across the image-forming area from a light source external to the image-forming area to a light sensor external to the image-forming area, said light paths being arranged in an area that is, at least in part, co-extensive with the array, said support being elastically deformable so that an application of force to the support causes the light paths to deform in a manner that reduces the portion of light passing through light paths that are elastically deformed by the application of force.

2. The display of claim 1, wherein the individually controllable image-forming elements are adapted to radiate light.

3. The display of claim 1, wherein the light source comprises at least one light-emitting element.

4. The display of claim 1, wherein a matrix of individually controllable light-emitting elements is provided and wherein the array comprises a first portion of the individually controllable light-emitting elements of the matrix and wherein the light source comprises a second portion of the individually controllable light-emitting elements of the matrix.

5. The display of claim 4, wherein individually controllable light-emitting elements of the first portion and the second portion are interspersed within the matrix.

6. The display of claim 1, wherein the light source comprises more than one individually controllable light-emitting element and different sets of the light paths associated with different ones of the more than one light-emitting element.

7. The display of claim 6, further comprising a control circuit for sequentially activating each of the more than one individually controllable light-emitting element.

8. The display claim 6, wherein at least two of the individually controllable light-emitting elements radiate a different type of light.

9. The display of claim 6, further comprising a control circuit for activating the light sources associated with different ones of the light paths in a predetermined temporal pattern and for using the predetermined pattern for filtering an output from the light sensor to discriminate light that has passed through different ones of the sets of light paths.

10. The display of claim 1, wherein the light sensor comprises more than one light sensitive area each area providing a separate signal indicating an amount of light incident thereupon and wherein different sets of the light paths are associated with different ones of the more than one light sensitive area.

11. The display of claim 1, wherein the light source comprises a source of non-visible light and wherein the light sensor is adapted to sense the non-visible light.

12. The display of claim 1, wherein the light paths form two patterns of light paths in a common plane, and wherein the two patterns arranged to at least partially intersect in a common area.

13. The display of claim 1, wherein the light paths form two patterns of light paths arranged in separate planes to at least partially overlap.

14. The display of claim 1, further comprising a control circuit adapted to activate the light source, to receive a signal from the light sensor representative of an amount of light incident upon the light sensor, and to determine from the light sensor signal when at least one of the light paths has been deformed.

15. The display of claim 1, wherein the individual light-emitting elements and the light source, are formed from organic light-emitting diodes.

16. The display of claim 1, wherein at least one of the light source, light-emitting elements, and light sensor are formed on the support.

17. The display of claim 16, further comprising a control circuit formed on the support.

18. The display of claim 1, wherein the light sensor is a non-organic light-detecting element.

19. The display of claim 1, wherein the light sensor is a silicon light-detecting element.

20. The display of claim 1, wherein the light sensor is a silicon light-detecting element formed in a thin film.

21. The display of claim 1, wherein the light sensor is an organic light sensor.

22. The display of claim 1, wherein said support is elastically deformable so that the application of force to the support causes the support to deform in a manner that reduces the portion of light passing through light paths in proportion to the amount of force applied.

23. The display of claim 1, wherein the light sensor provides an output signal that is in proportion to the amount of light received thereby.

24. The display of claim 1, wherein said support is elastically deformable so that the application of a first level of force to the support causes deformation in an area in which the force is applied that elastically alters the light paths in the force applied area to reduce the portion of light passing through the light paths in the force applied area to a first range.

25. The display of claim 24, wherein said support is further elastically deformable so that the application of a second level of force greater than the first level of support causes deformation in the force applied area that further alters the light paths in the force applied area to further reduce the portion of light passing through the light paths in the force applied area to a second range.

26. The display of claim 25, wherein the first range of portions and second range of portions are non-contiguous.

27. The display of claim 25, wherein the support and substrate comprise the same structure.

28. The display of claim 1, wherein the support comprises a first layer having a pattern of channels therein and a second layer sealing the channels.

29. The display of claim 28, wherein the channels are shaped for high efficiency transmission of light and wherein deformation of the support reduces the efficiency of light transmission therebetween.

30. A display comprising:

a substrate layer having an image-forming area;

a light-emitting and light-sensing layer formed on the substrate layer, the light-emitting and sensing layer having a plurality of individually controllable light emitters external to the image-forming area some of the light emitters being patterned in an array to form a display area and some of the light emitters being patterned for use as a light source with the light-emitting and sensing layer further comprising a plurality of individually addressable light sensors external to the image-forming area; and

an elastically deformable layer having a plurality of light path channels therein, each adapted to convey at least a portion of the light from one of the light emitters of the light source to one of the light sensors, said elastically deformable layer further being adapted to change the amount of light transmitted in response to deformation.

31. The display of claim 30, wherein the light-emitting and light-sensing layer is formed on one side of the substrate layer, with the elastically deformable layer being formed on another side of the substrate layer and with the substrate layer providing light channels defining a light travel path between the light source and the light sensor associated therewith.

32. The display of claim 30, further comprising a layer encapsulating the light-emitting and light-sensing layer, said layer being substantially transparent.

33. The display of claim 32, wherein the elastically deformable layer further encapsulates the substrate.

34. The display of claim 30, further comprising an intensity control circuit adapted to control the intensity of light emitted by the light-emitting elements and to sense the amount of light traveling to the light sensors so that the display elements modify the amount of light emitted by light-emitting elements that do not provide light to light pipes.