Light information device and method for producing the same
First Claim
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1. A light information device produced in accordance with the following process steps:
- producing a semiconductor element having a photoconductive effect or a photovoltaic effect and having an initial photoconductivity and an initial dark conductivity;
combining one or more additional elements with the semiconductor element which, in cooperation with the semiconductor element, allow the light information device to be used for a predefined function; and
substantially upon completion of the combining step performing a deliberate aging process including the step of;
applying a controlled external stimulus to the semiconductor element substantially for the purpose of varying the photoconductivity and the dark conductivity of the semiconductor element so as to have reduced values which are equal to or lower than 20% of the initial photoconductivity and the initial dark conductivity,whereby variation over time of the reduced photoconductivity and the reduced dark conductivity during the use of the light information device for the predefined function is reduced.
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Abstract
The light information device of the invention includes a semiconductor having a photoconductive effect or a photovoltaic effect. In the light information device, a photoconductivity and a dark conductivity of the semiconductor are varied by an aging process using an external stimulus, and the photoconductivity and the dark conductivity after the aging process have values which are equal to or lower than 20% of respective initial values thereof before the aging process.
11 Citations
37 Claims
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1. A light information device produced in accordance with the following process steps:
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producing a semiconductor element having a photoconductive effect or a photovoltaic effect and having an initial photoconductivity and an initial dark conductivity; combining one or more additional elements with the semiconductor element which, in cooperation with the semiconductor element, allow the light information device to be used for a predefined function; and substantially upon completion of the combining step performing a deliberate aging process including the step of; applying a controlled external stimulus to the semiconductor element substantially for the purpose of varying the photoconductivity and the dark conductivity of the semiconductor element so as to have reduced values which are equal to or lower than 20% of the initial photoconductivity and the initial dark conductivity, whereby variation over time of the reduced photoconductivity and the reduced dark conductivity during the use of the light information device for the predefined function is reduced. - View Dependent Claims (2, 3)
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4. A method for producing a light information device, comprising the steps of:
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selecting a semiconductor having a photoconductive effect or a photovoltaic effect and having an initial photoconductivity and an initial dark photoconductivity; applying a controlled external stimulus to said semiconductor; inducing aging of said semiconductor in accordance with said step of applying said controlled external stimulus; and selectively varying said initial conductivity and said initial dark conductivity, in accordance with said step of inducing aging, to produce a stabilized semiconductor having a reduced photoconductivity and a reduced dark conductivity which are 20% or less of said initial photoconductivity and said initial dark conductivity, wherein variation over time of said reduced photoconductivity and said reduced dark conductivity of said stabilized semiconductor is reduced. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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12. A light information apparatus comprising optical addressing means for selectively turning ON at least one of a plurality of switching devices in accordance with a light signal,
wherein each of the plurality of switching devices includes an input terminal for receiving an electric signal, an output terminal for outputting the received electric signal, and a semiconductor for providing a conductive path from the input terminal to the output terminal in accordance with the received light signal due to a photoconductive effect, and a photoconductivity and a dark conductivity of the semiconductor of each of the switching devices are varied by an aging process using an external stimulus, and the photoconductivity and the dark conductivity after the aging process are reduced to be 20% or less of respective initial values thereof before the aging process wherein the light information device is produced according to the following steps: -
producing a semiconductor element having a photoconductive effect or a photovoltaic effect and having an initial photoconductivity and an initial dark conductivity; combining one or more additional elements with the semiconductor element which, in cooperation with the semiconductor element, allow the light information device to be used for a predefined function; and substantially upon completion of the combining step performing a deliberate aging process including the step of; applying a controlled external stimulus to the semiconductor element substantially for the purpose of varying the photoconductivity and the dark conductivity of the semiconductor element so as to have reduced values which are equal to or lower than 20% of the initial photoconductivity and the initial dark conductivity, whereby variation over time of the reduced photoconductivity and the reduced dark conductivity during the use of the light information device for the predefined function is reduced. - View Dependent Claims (13, 14, 15, 16)
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17. A method for producing a light information apparatus comprising optical addressing means for selectively turning ON at least one of a plurality of switching devices in accordance with a light signal,
each of the plurality of switching devices including an input terminal for receiving an electric signal, an output terminal for outputting the received electric signal, and a semiconductor for providing a conductive path from the input terminal to the output terminal in accordance with the received light signal due to a photoconductive effect, wherein the method includes an aging step of varying a photoconductivity and a dark conductivity of the semiconductor by applying an external stimulus, and reducing the photoconductivity and the dark conductivity after the aging process to be 20% or less of respective initial values thereof before applying the external stimulus and wherein the light information device is produced in accordance with the following process steps: -
producing a semiconductor element having a photoconductive effect or a photovoltaic effect and having an initial photoconductivity and an initial dark conductivity; combining one or more additional elements with the semiconductor element which, in cooperation with the semiconductor element, allow the light information device to be used for a predefined function; and substantially upon completion of the combining step performing a deliberate aging process including the step of; applying a controlled external stimulus to the semiconductor element substantially for the purpose of varying the photoconductivity and the dark conductivity of the semiconductor element so as to have reduced values which are equal to or lower than 20% of the initial photoconductivity and the initial dark conductivity, whereby variation over time of the reduced photoconductivity and the reduced dark conductivity during the use of the light information device for the predefined function is reduced. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A light information device comprising:
- a first substrate and a second substrate;
a semiconductor layer disposed on one face of the first substrate facing the second substrate; and
an electro-optic medium provided on one face of the second substrate facing the first substrate, the light information device writing spatial light information input from the outside to the semiconductor layer through the first substrate into the electro-optic medium using a photoconductive effect of the semiconductor layer, and the light information device reading the spatial light information written in the electro-optic medium by modulating light input through the second substrate by the electro-optic medium,wherein the semiconductor layer has a photoconductivity and a dark conductivity varied by an aging process using an external stimulus, and values of the varied photoconductivity and the dark conductivity are 20% or less of respective initial values thereof before the aging process and wherein the light information device is produced by the following process steps; producing a semiconductor element having a photoconductive effect or a photovoltaic effect and having an initial photoconductivity and an initial dark conductivity; combining one or more additional elements with the semiconductor element which, in cooperation with the semiconductor element, allow the light information device to be used for a predefined function; and substantially upon completion of the combining step performing a deliberate aging process including the step of; applying a controlled external stimulus to the semiconductor element substantially for the purpose of varying the photoconductivity and the dark conductivity of the semiconductor element so as to have reduced values which are equal to or lower than 20% of the initial photoconductivity and the initial dark conductivity, whereby variation over time of the reduced photoconductivity and the reduced dark conductivity during the use of the light information device for the predefined function is reduced.
- a first substrate and a second substrate;
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28. A method for producing a light information device comprising:
- a first substrate and a second substrate;
a semiconductor layer disposed on one face of the first substrate facing the second substrate; and
an electro-optic medium provided on one face of the second substrate facing the first substrate, the light information device writing spatial light information input from the outside to the semiconductor layer through the first substrate into the electro-optic medium using a photo conductive effect of the semiconductor layer, and the light information device reading the spatial light information written in the electro-optic medium by modulating light input through the second substrate by the electro-optic medium, the method comprisingan aging process including the steps of applying a controlled external stimulus to said semiconductor; inducing aging of said semiconductor in accordance with said step of applying said controlled external stimulus; and selectively varying said initial conductivity and said initial dark conductivity, in accordance with said step of inducing aging, to produce a stabilized semiconductor having a reduced photoconductivity and a reduced dark conductivity which are 20% or less of said initial photoconductivity and said initial dark conductivity, wherein variation over time of said reduced photoconductivity and said reduced dark conductivity of said stabilized semiconductor is reduced. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
- a first substrate and a second substrate;
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37. A light information device produced in accordance with the following process steps:
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producing a semiconductor element having a photoconductive effect or a photovoltaic effect and having an initial photoconductivity and an initial dark conductivity; combining one or more additional elements with the semiconductor element which, in cooperation with the semiconductor element, allow the light information device to be used for a predefined function; and substantially upon completion of the combining step performing a deliberate aging process including the step of; applying for a predetermined time period at least one of light irradiation and an electric field to the semiconductor element substantially for the purpose of varying the photoconductivity and the dark conductivity of the semiconductor element so as to have reduced values which are equal to or lower than 20% of the initial photoconductivity and the initial dark conductivity, whereby variation over time of the reduced photoconductivity and the reduced dark conductivity during the use of the light information device for the predefined function is reduced.
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Specification