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; and
a diffuser between the plurality of turning features and the substrate, wherein the haze of the diffuser is spatially non-uniform.
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Accused Products
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.
154 Citations
62 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; and a diffuser between the plurality of turning features and the substrate, wherein the haze of the diffuser is spatially non-uniform. - 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, 26, 27)
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28. 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 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 (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. 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; and 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. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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55. 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 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 (56, 57, 58, 59, 60)
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61. 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; and disposing a plurality of turning features above the diffuser.
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62. 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 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