REFLECTIVE COLOR DISPLAY
First Claim
1. A reflective color display comprising:
- a substrate;
a first conductor layer supported by the substrate;
an array of pixel wells formed overlying the first conductive layer;
a piezoelectric layer formed overlying the first conductor layer, the piezoelectric layer being segmented such that there is a piezoelectric segment in each pixel well;
a second conductor layer overlying the piezoelectric layer, wherein an electric field created across any piezoelectric segment causes the piezoelectric segment to expand or contract under control of the electric field;
a photonic crystal layer overlying the piezoelectric layer, the photonic crystal layer being segmented such that there is a photonic crystal segment overlying each piezoelectric segment in each pixel well; and
a light source layer overlying the photonic crystal layer, the light source layer generating a multi-wavelength light emission impinging on each photonic crystal segment, wherein varying the electric field across each piezoelectric segment causes the photonic crystal segment above the associated piezoelectric segment to reflect a selected wavelength, whereby each pixel well can be controlled to reflect a selected color within the multi-wavelength light emission.
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Accused Products
Abstract
A reflective color display is disclosed. A substrate supports a first conductor layer and pixel wells. A piezoelectric segment is formed in each pixel well over the first conductor layer. A second conductor layer overlies the piezoelectric segments, wherein an electric field created across any piezoelectric segment causes the piezoelectric segment to expand or contract under control of the electric field. A Bragg reflector segment overlies each piezoelectric segment and is compressible by expansion of the underlying piezoelectric segment. A white light LED layer overlies the Bragg reflector segments. By varying the electric field across each piezoelectric segment, the overlying Bragg reflector segment is controlled to reflect a selected wavelength for each pixel of the display. The walls of the pixel wells provide acoustic isolation between adjacent pixel wells. An acoustic membrane isolates the Bragg reflector segment from high frequency vibrations of the piezoelectric segment.
48 Citations
25 Claims
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1. A reflective color display comprising:
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a substrate; a first conductor layer supported by the substrate; an array of pixel wells formed overlying the first conductive layer; a piezoelectric layer formed overlying the first conductor layer, the piezoelectric layer being segmented such that there is a piezoelectric segment in each pixel well; a second conductor layer overlying the piezoelectric layer, wherein an electric field created across any piezoelectric segment causes the piezoelectric segment to expand or contract under control of the electric field; a photonic crystal layer overlying the piezoelectric layer, the photonic crystal layer being segmented such that there is a photonic crystal segment overlying each piezoelectric segment in each pixel well; and a light source layer overlying the photonic crystal layer, the light source layer generating a multi-wavelength light emission impinging on each photonic crystal segment, wherein varying the electric field across each piezoelectric segment causes the photonic crystal segment above the associated piezoelectric segment to reflect a selected wavelength, whereby each pixel well can be controlled to reflect a selected color within the multi-wavelength light emission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method performed by a color reflective display comprising:
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receiving a multi-wavelength light emission from a light source; controlling an electric field across a piezoelectric layer segment, wherein a piezoelectric layer is divided into an array of piezoelectric layer segments, with each piezoelectric layer segment being in an associated pixel well; compressing and expanding the piezoelectric layer segment pursuant to the electric field; and selectively reflecting color components of the multi-wavelength light emission by a photonic crystal layer segment overlying the piezoelectric layer segment, wherein a photonic crystal layer is divided into an array of photonic crystal layer segments, with each photonic crystal layer segment being in an associated pixel well, the compressing and expanding of the piezoelectric layer segment causing the photonic crystal layer segment to compress and expand to adjust a wavelength reflection characteristic of the photonic crystal layer segment. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification