Thin displays having spatially variable backlights
First Claim
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1. A light source comprising:
- a light-emitting layer operative to emit light in response to an electrical potential difference being applied across the light-emitting layer, emitted light having an intensity dependent upon a magnitude of the potential difference;
a first electrode structure comprising a first electrically-conductive electrode on a first face of the light-emitting layer;
a second electrode structure comprising a layer of a potential-distributing material having an electrical resistance on a second face of the light-emitting layer and an array of control points in electrical contact with the layer of potential-distributing material at locations spaced apart over the second face of the light-emitting layer; and
a power supply having a plurality of independently-controllable outputs, the outputs each connected to a corresponding one of the control points; and
wherein the control points have a non-uniform spatial density and the control points are concentrated more densely in a central region of the light-emitting layer and less densely in a peripheral region of the light-emitting layer.
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Abstract
A display has a light source layer having control inputs for controlling the light source layer to emit light such that the light output varies smoothly with position in a manner determined by the control inputs. An LCD panel or other spatial light modulator modulates light from the light source layer. The light source layer may be thin.
20 Citations
20 Claims
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1. A light source comprising:
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a light-emitting layer operative to emit light in response to an electrical potential difference being applied across the light-emitting layer, emitted light having an intensity dependent upon a magnitude of the potential difference; a first electrode structure comprising a first electrically-conductive electrode on a first face of the light-emitting layer; a second electrode structure comprising a layer of a potential-distributing material having an electrical resistance on a second face of the light-emitting layer and an array of control points in electrical contact with the layer of potential-distributing material at locations spaced apart over the second face of the light-emitting layer; and a power supply having a plurality of independently-controllable outputs, the outputs each connected to a corresponding one of the control points; and wherein the control points have a non-uniform spatial density and the control points are concentrated more densely in a central region of the light-emitting layer and less densely in a peripheral region of the light-emitting layer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A light source comprising:
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a light-emitting layer operative to emit light in response to an electrical potential difference being applied across the light-emitting layer, emitted light having an intensity dependent upon a magnitude of the potential difference; a first electrode structure comprising a first electrically-conductive electrode on a first face of the light-emitting layer; a second electrode structure comprising a layer of a potential-distributing material having an electrical resistance on a second face of the light-emitting layer and an array of control points in electrical contact with the layer of potential-distributing material at locations spaced apart over the second face of the light-emitting layer; a power supply having a plurality of independently-controllable outputs, the outputs each connected to a corresponding one of the control points; and optically absorbing spots on the first surface of the light emitting layer at locations corresponding to the control points. - View Dependent Claims (8)
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9. A display comprising:
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a light source comprising a plurality of control inputs; and a spatial light modulator illuminated by the light source; wherein; the control inputs correspond to spots on the light source, the spatial light modulator comprises a plurality of pixels, each illuminated by a different area of the light source, the illumination provided by each of the different areas of the light source is a function of the position of the area relative to positions of the spots and of signals applied to the control inputs; and the control points have a varying spatial density and the control points are concentrated more densely in a central region of the light-emitting layer and less densely in a peripheral region of the light-emitting layer. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification