High aperture AMLCD with nonparallel alignment of addressing lines to the pixel edges or with distributed analog processing at the pixel level
First Claim
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1. A transmissive light valve with high aperture architecture constructed through steps comprising:
- providing an active matrix substrate, said substrate manufactured through steps, comprising;
providing a substrate;
forming an active matrix addressing means on one side of said substrate, said active matrix addressing means, wherein said active matrix addressing means comprises a plurality of addressing lines, and a plurality of active pixel circuits in electrical connection with the plurality of addressing lines;
depositing an insulating dielectric layer over said active matrix addressing means;
depositing a plurality of pixel electrodes which are substantially contiguous and substantially transparent to a range of optical wavelengths, on the opposite side of the insulating layer with respect to said plurality of addressing lines, where a subset of said addressing lines are situated under said pixel electrodes and are aligned in a nonparallel fashion with respect to the edges of said pixel electrodes; and
establishing an electrical contact between each of said pixel electrodes and a corresponding active pixel circuit;
positioning an electro-optic medium comprised of liquid crystal proximate to said active matrix substrate, wherein the electro-optic medium is substantially electrically shielded from the plurality of addressing lines by said plurality of pixel electrodes; and
providing a backplane substrate proximate to said electro-optic medium.
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Abstract
An approach for constructing active matrix liquid crystal light valves having very high aperture ratio is described. This is achieved by a burying the pixel addressing elements beneath a planarized array of nearly contiguous pixel electrodes and minimizing the footprint of opaque structures in the light valve. Undesirable field-induced disclinations and deformations of the liquid crystal are minimized by shielding the addressing structures with the pixel electrodes. Embodiments are provided which utilize the approach to improve transmittance, image quality, yield, design flexibility and functionality of the display.
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Citations
36 Claims
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1. A transmissive light valve with high aperture architecture constructed through steps comprising:
providing an active matrix substrate, said substrate manufactured through steps, comprising; providing a substrate; forming an active matrix addressing means on one side of said substrate, said active matrix addressing means, wherein said active matrix addressing means comprises a plurality of addressing lines, and a plurality of active pixel circuits in electrical connection with the plurality of addressing lines; depositing an insulating dielectric layer over said active matrix addressing means; depositing a plurality of pixel electrodes which are substantially contiguous and substantially transparent to a range of optical wavelengths, on the opposite side of the insulating layer with respect to said plurality of addressing lines, where a subset of said addressing lines are situated under said pixel electrodes and are aligned in a nonparallel fashion with respect to the edges of said pixel electrodes; and establishing an electrical contact between each of said pixel electrodes and a corresponding active pixel circuit; positioning an electro-optic medium comprised of liquid crystal proximate to said active matrix substrate, wherein the electro-optic medium is substantially electrically shielded from the plurality of addressing lines by said plurality of pixel electrodes; and providing a backplane substrate proximate to said electro-optic medium. - 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)
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24. A transmissive active matrix liquid crystal light valve with high aperture architecture, comprising:
an active matrix substrate, comprising; an insulating layer; a plurality of addressing lines having shared contacts situated on one side of said insulating layer; a plurality of pixel electrodes which are nearly contiguous and substantially transparent to a range of optical wavelengths, and situated on the opposite side of the insulating layer with respect to said plurality of addressing lines, where a subset of said addressing lines are situated under said pixel electrodes and are aligned in a nonparallel fashion with respect to the edges of said pixel electrodes; a plurality of active pixel circuits in electrical connection with the plurality of addressing lines, where each of said active pixel circuits corresponds to one of the plurality of pixel electrodes; and electrical coupling means between said pixel electrodes and corresponding active pixel circuits; an electro-optic medium comprised of liquid crystal proximate to said active matrix substrate, wherein the electro-optic medium is substantially electrically shielded from the plurality of addressing lines by said plurality of pixel electrodes; and a backplane substrate proximate to said electro-optic medium. - View Dependent Claims (25, 26)
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27. A transmissive active matrix liquid crystal light valve with high aperture architecture, comprising:
an active matrix substrate, comprising; an insulating layer; a plurality of addressing lines situated on one side of said insulating layer; a plurality of pixel electrodes which are nearly contiguous and substantially transparent to a range of optical wavelengths, and situated on the opposite side of the insulating layer with respect to said plurality of addressing lines; a plurality of active pixel circuits each comprised of an analog latch circuit and a voltage limiting circuit where an oscillating voltage is applied to said backplane such that an alternating voltage is applied across the electro-optic medium, the amplitude of said alternating voltage being controlled by said analog latching circuit, said plurality of active pixel circuits are in electrical connection with the plurality of addressing lines, where each of said active pixel circuits corresponds to one of the plurality of pixel electrodes and each active pixel circuit contains a plurality of active circuit elements; and electrical coupling means between said pixel electrodes and corresponding active pixel circuits; an electro-optic medium comprised of liquid crystal proximate to said active matrix substrate, wherein the electro-optic medium is substantially electrically shielded from the plurality of addressing lines by said plurality of pixel electrodes; and a backplane substrate proximate to said electro-optic medium. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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35. A transmissive subtractive color active matrix liquid crystal light valve stack with high aperture architecture, comprising:
a plurality of stacked active matrix liquid crystal light valves, where each of said active matrix liquid crystal light valves selectively modulates a range of optical wavelengths and the ranges of the optical wavelengths are substantially non-overlapping, each of said light valves is comprised of; an active matrix substrate, comprising; an insulating layer; a plurality of addressing lines situated on one side of said insulating layer; a plurality of pixel electrodes substantially transparent to a range of optical wavelengths, and situated on the opposite side of the insulating layer with respect to said plurality of addressing lines, where a subset of said addressing lines are situated under said pixel electrodes and are aligned in a nonparallel fashion with respect to the edges of said pixel electrodes; a plurality of active pixel circuits in electrical connection with the plurality of addressing lines, where each of said active pixel circuits corresponds to one of the plurality of pixel electrodes; and electrical coupling means between said pixel electrodes and corresponding active pixel circuits; an electro-optic medium comprised of liquid crystal proximate to said active matrix substrate, wherein the electro-optic medium is substantially electrically shielded from the plurality of addressing lines by said plurality of pixel electrodes; and a backplane substrate proximate to said electro-optic medium. - View Dependent Claims (36)
Specification