Method and apparatus for front-lit semi-retro-reflective display
First Claim
Patent Images
1. A reflective display device, comprising:
- a semi-retro-reflective display sheet having one or more convex protrusions to reflect light in a narrow angle relative to the direction of the incident light;
a light guide;
a light source to emit light to the light guide, the light guide configured to redirect light in a substantially perpendicular direction towards a surface of the semi-retro-reflective display sheet;
a front electrode;
a rear electrode;
an optically transparent fluid disposed between the front and the rear electrodes; and
a plurality of electrophoretically mobile particles suspended in the optically transparent fluid.
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Abstract
The disclosure generally relates to a front-lit display having transparent and selectively emissive light directionality. The disclosed semi-retro-reflective, semi-specular and specular displays include directional front light systems that reflect light in a manner to preserve the non-Lambertian characteristic of the light output. This leads to brighter displays with a higher degree of luminance as compared to conventional microencapsulated electrophoretic displays with substantially Lambertian reflectance where much of the light is not reflected back towards the viewer.
106 Citations
24 Claims
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1. A reflective display device, comprising:
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a semi-retro-reflective display sheet having one or more convex protrusions to reflect light in a narrow angle relative to the direction of the incident light; a light guide; a light source to emit light to the light guide, the light guide configured to redirect light in a substantially perpendicular direction towards a surface of the semi-retro-reflective display sheet; a front electrode; a rear electrode; an optically transparent fluid disposed between the front and the rear electrodes; and a plurality of electrophoretically mobile particles suspended in the optically transparent fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A reflective display, comprising:
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a transparent outer sheet; a light guide; a light source to emit light into the light guide, the light guide configured to redirect light in a substantially perpendicular direction-towards a surface of the transparent outer sheet; a rear electrode; a perforated sheet situated between the light source and the rear electrode; a front electrode disposed over the perforated sheet; a semi-retro-reflective surface over the perforated sheet; a medium disposed within the cavity formed between the transparent outer sheet and the rear electrode; and a plurality of electrophoretically mobile particles suspended in the medium. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A reflective display device, comprising:
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a transparent outer sheet; a light guide; a light source to emit light into the light guide, the light guide to redirect light in a substantially perpendicular direction towards a surface of the transparent outer sheet; a rear electrode; a perforated sheet situated between the light guide and the rear electrode; a reflective layer disposed over the perforated sheet; a transparent front electrode disposed over the perforated sheet; a medium disposed within the cavity formed between the transparent outer sheet and the rear electrode; and a plurality of electrophoretically mobile particles suspended in the medium. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification