LED array with photodetector
First Claim
1. An array, comprising:
- a plurality of light emitting devices disposed on a transparent substrate, the transparent substrate having an upper surface that contacts each light emitting device, a lower surface distal from the plurality of light emitting devices and a plurality of side surfaces, each of the side surfaces being substantially perpendicular to the upper surface,wherein each of the plurality of light emitting devices is individually addressed to display an image; and
at least one photodetector non-removably flush mounted, with a detector side facing the plurality of light emitting devices, on an external face of the lower surface of the transparent substrate for detecting a fraction of waveguided light emitted from the plurality of light emitting devices, wherein another fraction of waveguided light is edge emitted, wherein the fraction of waveguided light and the another fraction of waveguided light is directly observable.
1 Assignment
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Accused Products
Abstract
Embodiments of the present invention provide for an array, and corresponding method of forming an array, that includes a plurality of light emitting devices. The light emitting devices are disposed over a substrate, and a photodetector detects light emitted through the substrate from the light emitting devices. Further, a substantially constant brightness may be maintained in a plurality of light emitting devices disposed over the upper surface of a substrate in an array. Light emitted through the substrate from each of the light emitting devices is measured, and the voltage level applied to each of the light emitting devices is varied to maintain a substantially constant brightness level of light emitted from the light emitting devices.
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Citations
32 Claims
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1. An array, comprising:
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a plurality of light emitting devices disposed on a transparent substrate, the transparent substrate having an upper surface that contacts each light emitting device, a lower surface distal from the plurality of light emitting devices and a plurality of side surfaces, each of the side surfaces being substantially perpendicular to the upper surface, wherein each of the plurality of light emitting devices is individually addressed to display an image; and at least one photodetector non-removably flush mounted, with a detector side facing the plurality of light emitting devices, on an external face of the lower surface of the transparent substrate for detecting a fraction of waveguided light emitted from the plurality of light emitting devices, wherein another fraction of waveguided light is edge emitted, wherein the fraction of waveguided light and the another fraction of waveguided light is directly observable. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for forming an array, comprising:
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forming a plurality of light emitting devices disposed on a transparent substrate, said transparent substrate having an upper surface contacting each light emitting device, a lower surface distal from the light emitting device and at least one side surface substantially perpendicular to said upper surface of the transparent substrate, wherein each of the plurality of light emitting devices is individually addressed to display an image; and non-removably flush mounting, with a detector side facing the plurality of light emitting devices, a photodetector at the lower surface of the transparent substrate for detecting a fraction of waveguided light emitted through the transparent substrate, wherein another fraction of waveguided light is edge emitted, wherein the fraction of waveguided light and the another fraction of waveguided light is directly observable. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An array, comprising:
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a plurality of light emitting devices formed on a surface of a transparent substrate, the transparent substrate having an upper surface that contacts each light emitting device, a lower surface distal from the light emitting device and a plurality of side surfaces, wherein each of the plurality of light emitting devices is individually addressed to display an image; and at least two photodetectors non-removably flush mounted, with a detector side facing the plurality of light emitting devices, on an external opposite surface of the transparent substrate for detecting a fraction of waveguided light emitted from the plurality of light emitting devices, wherein another fraction of waveguided light is edge emitted, wherein the fraction of waveguided light and the another fraction of waveguided light is directly observable. - View Dependent Claims (16, 17, 18, 19)
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20. An array, comprising:
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a plurality of light emitting devices disposed over a substrate having an upper surface that contacts each of the light emitting devices, a lower surface distal from the plurality of light emitting devices and a plurality of side surfaces, wherein each of the plurality of light emitting devices is individually addressed to display an image; and a photodetector that detects a fraction of waveguided light emitted through the substrate from the plurality of light emitting devices and wherein another fraction of waveguided light is emitted at the edge of the substrate, wherein the fraction of waveguided light and the another fraction of waveguided light is directly observable, wherein the photodetector is non-removably flush mounted, with a detector side facing the plurality of light emitting devices, on the lower surface and wherein at least one light emitting device comprises an OLED. - View Dependent Claims (21, 22, 23)
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24. An array, comprising:
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a plurality of fight emitting devices disposed over a substrate having an upper surface that contacts each of the light emitting devices, a lower surface distal from the plurality of light emitting devices and a plurality of side surfaces, wherein each of the plurality of light emitting devices is individually addressed to display an image; and a photodetector that detects a fraction of waveguided light emitted through the substrate from the plurality of light emitting devices and wherein another fraction of waveguided light is emitted at the edge of the substrate, wherein the fraction of waveguided light and the another fraction of waveguided light is directly observable, wherein the photodetector is non-removably flush mounted, with a detector side facing the plurality of light emitting devices, on the lower surface and wherein at least one light emitting device comprises a PLED. - View Dependent Claims (25, 26, 27)
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28. An array, comprising:
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a plurality of light emitting devices disposed over a substrate having an upper surface that contacts each of the light emitting devices, a lower surface distal from the plurality of light emitting devices and a plurality of side surfaces, wherein each of the plurality of light emitting devices is individually addressed to display an image; and a photodetector that detects a fraction of waveguided light emitted through the substrate from the plurality of light emitting devices and wherein another fraction of waveguided light is emitted at the edge of the substrate, wherein the fraction of waveguided light and the another fraction of waveguided light is directly observable wherein the photodetector is non-removably flush mounted, with a detector side facing the plurality of light emitting devices, on the lower surface and wherein at least one light emitting device comprises a QDLED. - View Dependent Claims (29, 30, 31, 32)
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Specification