Electrophoretic electronic displays with low-index films
First Claim
1. A display device comprising:
- a window layer having a refractive index that is greater than a refractive index of an ambient environment;
a plurality of reflective particles suspended in a fluid, the plurality of reflective particles for scattering light received from the ambient environment;
a material portion disposed between the plurality of reflective particles and the window layer; and
a refractive layer disposed between the material portion and the window layer, and having a refractive index that is less than the refractive index of the window layer and less than a refractive index of the material portion.
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Accused Products
Abstract
The invention features a reflective display device and a method of making a reflective display device that has reduced light loss and/or pixel cross talk due to internal reflection. The device includes a window layer, a plurality of reflective particles, a material portion disposed between the window layer and the plurality of reflective particles, and a refractive layer disposed between the window and the material portion. The plurality of reflective particles scatters light received from the ambient environment. The window layer has an index of refraction that is greater than an index of refraction of the ambient environment. The refractive layer has an index of refraction that is less than the index of refraction of the window layer and less than an index of refraction of the material portion.
583 Citations
32 Claims
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1. A display device comprising:
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a window layer having a refractive index that is greater than a refractive index of an ambient environment;
a plurality of reflective particles suspended in a fluid, the plurality of reflective particles for scattering light received from the ambient environment;
a material portion disposed between the plurality of reflective particles and the window layer; and
a refractive layer disposed between the material portion and the window layer, and having a refractive index that is less than the refractive index of the window layer and less than a refractive index of the material portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A display device comprising:
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a window layer having a refractive index that is greater than a refractive index of an ambient environment;
a plurality of reflective particles for scattering light received from the ambient environment, wherein at least one of the plurality of reflective particles is selected from the group consisting of an electrophoretic particle, a rotating bichromal member, and an electrochromic particle;
a material portion disposed between the plurality of reflective particles and the window layer; and
a refractive layer disposed between the material portion and the window layer, and having a refractive index that is less than the refractive index of the window layer and less than a refractive index of the material portion. - View Dependent Claims (24, 25, 26)
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27. A method for making a display device, the method comprising:
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providing a window layer having a refractive index that is greater than a refractive index of an ambient environment;
providing a plurality of reflective particles suspended in a fluid, the plurality of reflective particles for scattering light received from the ambient environment;
providing a material portion disposed between the plurality of reflective particles and the window layer; and
providing a refractive layer disposed between the material portion and the window layer, and having a refractive index that is less than the refractive index of the window layer and less than a refractive index of the material portion. - View Dependent Claims (28, 29, 30)
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31. A display device comprising:
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a window layer having a refractive index that is greater than a refractive index of an ambient environment, wherein the ambient environment comprises air;
a plurality of reflective particles for scattering light received from the ambient environment;
a material portion disposed between the plurality of reflective particles and the window layer; and
a refractive layer disposed between the material portion and the window layer and having a refractive index in a range of 1.0 to 1.2.
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32. A display device comprising:
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a window layer having a refractive index that is greater than a refractive index of an ambient environment;
a plurality of reflective particles for scattering light received from the ambient environment;
a material portion disposed between the plurality of reflective particles and the window layer; and
a refractive layer disposed between the material portion and the window layer, the refractive layer has a thickness greater than the longest wavelength of visible light incident upon the display, and the refractive layer has a refractive index that is less than the refractive index of the window layer and less than a refractive index of the material portion.
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Specification