Integrated front light diffuser for reflective displays
First Claim
Patent Images
1. A display device comprising:
- an optically transmissive substrate;
a plurality of display elements rearward of the substrate;
a plurality of turning features forward of the substrate;
a diffuser between the plurality of turning features and the substrate, wherein the haze of the diffuser is spatially non-uniform; and
at least one input port for coupling light from a light source into the display device,wherein the trend of the haze of the diffuser increases with distance from the input port.
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Abstract
A reflective electronic display includes a front light assembly with a diffuser for enlarging the viewing cone of the display. The front light may include a substrate, a plurality of optical turning features, and a diffuser formed therebetween. The haze of the diffuser may be spatially non-uniform and switchable between two or more levels.
256 Citations
58 Claims
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1. A display device comprising:
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an optically transmissive substrate; a plurality of display elements rearward of the substrate; a plurality of turning features forward of the substrate; a diffuser between the plurality of turning features and the substrate, wherein the haze of the diffuser is spatially non-uniform; and at least one input port for coupling light from a light source into the display device, wherein the trend of the haze of the diffuser increases with distance from the input port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A display device comprising:
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a plurality of pixels; a light assembly configured to illuminate the plurality of pixels, the light assembly comprising; a light source to output light; a light guide that is configured to distribute light from the light source to the plurality of pixels; and a diffuser that is switchable between a first state wherein the diffuser has a first haze value at a selected point and a second state wherein the diffuser has a second haze value at the selected point, the second haze value being greater than the first; and a controller configured to receive a control input indicative of the output of the light source, the controller being further configured to place the diffuser in the first state when the output of the light source is above a selected threshold, and to place the diffuser in the second state when the output of the light source is below the selected threshold. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A display device comprising:
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means for providing structural support to the display device, said support means being optically transmissive; means for displaying an image, said image display means disposed rearward of the support means; means for turning light, said light turning means disposed forward of the support means; means for diffusing light, said diffusing means disposed between the light turning means and the support means, wherein the haze of the diffusing means is spatially non-uniform; and means for coupling light into the display device, the light coupling means including at least one input port for coupling light from a light source into the display device, wherein the trend of the haze of the diffuser increases on average with distance from the input port. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. A display device comprising:
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means for displaying an image; means for illuminating the image display means, the illumination means comprising; means for outputting light; means for guiding and distributing light from the light outputting means to the image display means; means for diffusing light, wherein the light diffusing means is switchable between a first state wherein the light diffusing means has a first haze value at a selected point, and a second state wherein the light diffusing means has a second haze value at the selected point, the second haze value being greater than the first; and means for controlling, the control means being configured to receive a control input indicative of the output of the light outputting means, the control means being further configured to place the light diffusing means to be in the first state when the output of the light outputting means is above a selected threshold, and to place the light diffusing means in the second state when the output of the light outputting means is below the selected threshold. - View Dependent Claims (52, 53, 54, 55, 56)
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57. A method for fabricating a display device, the method comprising:
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providing an optically transmissive substrate; disposing a plurality of display elements below the substrate; disposing a diffuser above the substrate, wherein the haze of the diffuser is spatially non-uniform; disposing a plurality of turning features above the diffuser; and providing at least one input port for coupling light from a light source into the display device, wherein the trend of the haze of the diffuser increases with distance from the input port.
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58. A method for operating a display device, the method comprising:
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providing a display device comprising, a plurality of pixels, and a light assembly configured to illuminate the plurality of pixels, the light assembly comprising a light source to output light, a light guide that is configured to distribute light from the light source to the plurality of pixels, and a diffuser that is switchable between a first state wherein the diffuser has a first haze value at a selected point and a second state wherein the diffuser has a second haze value at the selected point, the second haze value being greater than the first; and receiving a control input indicative of the output of the light source, and controlling the diffuser to be in the first state when the output of the light source is above a selected threshold, and controlling the diffuser to be in the second state when the output of the light source is below the selected threshold.
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Specification