EP0494452A2
Expired / Lapsed
EP
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A spatial light modulator and a neural network circuit
Assignee: Panasonic Holdings Corp
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Filing: 1991-12-28
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Granted: —
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Expires: 2011-12-28
Abstract
Abstract The present invention relates to a spatial light modulator used for an optical computing system or display, which comprises a photoconductive layer having a rectification function for receiving incident lights to generate charges, an electrode for accumulating the charges and a ferroelectric liquid crystal layer for modulating the incident light according to bias voltage change with the accumulated charges, wherein the ferroelectric liquid crystal layer is arranged between a pair of alignment layers made of polyimide represented by the general formula (I); wherein n is 2 or more, X is O, S, Se or Te, Y is a aromatic group or a substituted aromatic group, Z is a group containing a aromatic group. In the spatial light modulator, any charges are not accumulated on an alignment layer with the driving time and thus a bistable memory condition can be realized.
Inventors
- 👤 Akio Takimoto
- 👤 Koji Akiyama
- 👤 Michihiro Miyauchi
- 👤 Koji Nomura
- 👤 Hisahito Ogawa
- 👤 Junko Asayama
- 👤 Yasunori Kuratomi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 09:17
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1046; C08G73/105; C08G73/1057; C08G73/1064; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/133723; G06; G06V; G06V10/00; G06V10/40; G06V10/44; G06V10/443; G06V10/449; G06V10/451; G06V10/454; G06V10/88; C09; C09K; C09K2323/00; C09K2323/02; C09K2323/027; G02F1/135; G02F1/137; G02F1/139; G02F1/141; G02F2203/00; G02F2203/01; G02F2203/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
90 words
A spatial light modulator comprising a photoconductive layer having a rectification function for receiving incident lights to generate charges, an electrode for accumulating the charges and a ferroelectric liquid crystal layer for modulating the incident light, wherein the ferroelectric liquid crystal layer is arranged between a pair of alignment layers made of polyimide represented by the general formula (I); wherein n is 2 or more, X is O, S, Se or Te, Y is a aromatic group or a substituted aromatic group, Z is a group containing a aromatic group.
Claim 2
Dependent Claim
90 words
A spatial light modulator comprising a photoconductive layer having a rectification function for receiving incident lights to generate charges, an electrode for accumulating the charges and a ferroelectric liquid crystal layer for modulating the incident light, wherein the ferroelectric liquid crystal layer is arranged between a pair of alignment layers made of polyimide represented by the general formula (I); wherein n is 2 or more, X is O, S, Se or Te, Y is a aromatic group or a substituted aromatic group, Z is a group containing a aromatic group.
Claim 3
Dependent Claim
70 words
The spatial light modulator according to claim 1, the polyimide of the general formula (I) is obtained by reacting a diamine represented by the formula -(-X--Y-)n- (II) wherein n, X and Y are defined as above, with a carboxylic acid containing Z group defined as above to give a polyimide precursor and a coated film of the precursor on a desired substrate is subjected to a heated condensation polymerization reaction.
Claim 4
Dependent Claim
190 words
A reflective spatial light modulator used for a high bright projection display device provided with a larger opening rate and a multi-stage optical processing device in which an output light can be amplified to use it as a next stage input light, which comprises (1) a first laminated plate comprising a transparent dielectrical substrate 101, a transparent electric conductive electrode 102, a photoconductive layer 103, plural reflective electrodes 104 separated each other on the surface of the photoconductive layer 103 for collecting charges generated on the photoconductive layer 103 and reflecting incident lights from the direction opposite to the photoconductive layer 103 and an alignment layer 105; (2) a second laminated plate comprising a transparent dielectrical substrate 109, a transparent electric conductive electrode 108 and an alignment layer 105; and (3) a ferroelectric liquid crystal 106 inserted between both alignment layers of the first and second plates, wherein the alignment layer comprises polyimide represented by the general formula (I); wherein n is 2 or more, X is O, S, Se or Te, Y is a aroma group or a substituted aromatic group, Z is a group containing a aromatic group.
Claim 5
Dependent Claim
190 words
A reflective spatial light modulator used for a high bright projection display device provided with a larger opening rate and a multi-stage optical processing device in which an output light can be amplified to use it as a next stage input light, which comprises (1) a first laminated plate comprising a transparent dielectrical substrate 101, a transparent electric conductive electrode 102, a photoconductive layer 103, plural reflective electrodes 104 separated each other on the surface of the photoconductive layer 103 for collecting charges generated on the photoconductive layer 103 and reflecting incident lights from the direction opposite to the photoconductive layer 103 and an alignment layer 105; (2) a second laminated plate comprising a transparent dielectrical substrate 109, a transparent electric conductive electrode 108 and an alignment layer 105; and (3) a ferroelectric liquid crystal 106 inserted between both alignment layers of the first and second plates, wherein the alignment layer comprises polyimide represented by the general formula (I); wherein n is 2 or more, X is O, S, Se or Te, Y is a aroma group or a substituted aromatic group, Z is a group containing a aromatic group.
Claim 6
Dependent Claim
184 words
A transmissive spatial light modulator used for an optical processing device in which two or more lights, each having a different wavelength, can be processed and a thin transmission display device which displays with a single color light, which comprises (1) a first laminated plate comprising a transparent dielectrical substrate 201, for example made of glass material, a transparent electric conductive electrode 202, a photoconductive layer 203, a transparent electric conductive electrode 204 for collecting charges generated on the photoconductive layer 203 and making incident lights 213 passed through the photoconductive layer 203 and an alignment layer 205; (2) a second laminated plate comprising a transparent dielectrical substrate 209, a transparent electric conductive electrode 208 and an alignment layer 207; and (3) a ferroelectric liquid crystal 206 inserted between both alignment layers 205 and 207 of the first and second plates, wherein the alignment layer comprises polyimide represented by the general formula (I); wherein n is 2 or more, X is O, S, Se or Te, Y is a aromatic group or a substituted aromatic group, Z is a group containing a aromatic group.
Claim 7
Dependent Claim
184 words
A transmissive spatial light modulator used for an optical processing device in which two or more lights, each having a different wavelength, can be processed and a thin transmission display device which displays with a single color light, which comprises (1) a first laminated plate comprising a transparent dielectrical substrate 201, for example made of glass material, a transparent electric conductive electrode 202, a photoconductive layer 203, a transparent electric conductive electrode 204 for collecting charges generated on the photoconductive layer 203 and making incident lights 213 passed through the photoconductive layer 203 and an alignment layer 205; (2) a second laminated plate comprising a transparent dielectrical substrate 209, a transparent electric conductive electrode 208 and an alignment layer 207; and (3) a ferroelectric liquid crystal 206 inserted between both alignment layers 205 and 207 of the first and second plates, wherein the alignment layer comprises polyimide represented by the general formula (I); wherein n is 2 or more, X is O, S, Se or Te, Y is a aromatic group or a substituted aromatic group, Z is a group containing a aromatic group.
Claim 8
Dependent Claim
121 words
A neural network circuit, which comprises an input means for projecting an input light, an optical mask means for modulate a light intensity of the input light and a spatial light modulator according to claims 1 to 4, wherein the input light is changed in a light intensity for integrating-operation by passing through the optical mask means and then the output light is injected into a reflective electrode 104 of the reflective type modulator 102 or a transparent electric conductive electrode 204 of the transmissive type modulator 202 for summation processing and finally the summed output light is passing through the ferroelectric liquid crystal layer 106 or 206 of the modulator 102 or 202 to be subjected to a thresholding processing.
Claim 9
Dependent Claim
32 words
The neural network circuit according to claim 5, wherein the optical mask means is constructed by a spatial light modulator in which light transmissivity is changed by electric field or light injection.
Claim 10
Dependent Claim
41 words
The neural network circuit according to claim 5, wherein the optical mask means is constructed by a liquid crystal element which can be drived by field effect transistor and through which the light transmissivity can be controlled by field effect transistor.
Claim 11
Dependent Claim
35 words
The neural network circuit according to claim 5, wherein an image input is developed on the optical mask means by a lenslet array arranged in a form of planar structure to the optical neural network.
References Cited (Backward Citations)
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