Transparent thin-film EL display apparatus with ambient light adaptation means
First Claim
1. A transparent thin-film EL display apparatus comprising:
- at least one thin-film EL element having at least a luminescent layer of a luminescent material and a transparent insulation layer disposed between a pair of transparent electrodes; and
a housing comprising a light-transmitting front substrate and a light-transmitting rear substrate, said thin-film EL element being housed within said housing,wherein said light-transmitting rear substrate contains a photochromic compound which discolors and darkens in response to an increase in intensity of external light, said photochromic compound being restored to one of an original colorless and a transparent colored condition in response to a decrease in intensity thereof.
1 Assignment
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Accused Products
Abstract
A transparent thin-film EL display apparatus has a transparent thin-film EL element formed on a glass substrate. A rear substrate consisting of photochromic glass and the glass substrate on which the EL element is formed are disposed facing each other with the EL element located in between. A light-transmitting insulation material is inserted in a space between the two substrates and hermetically sealed. When the display on the EL element becomes hard to see due to light entering from the rear of the display apparatus, the photochromic glass reacts in response to the light and darkens the rear of the EL element, thereby blocking the light. Accordingly, normally the display apparatus displays various items of information through the front substrate and ensures visibility of the background through the display apparatus, and when high-intensity external light enters through the rear, the display apparatus reacts and blocks this light by means of a light shutter function, thereby enabling reliable display of the information without impairment of display contrast, thus guaranteeing a stable and highly reliable display.
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Citations
21 Claims
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1. A transparent thin-film EL display apparatus comprising:
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at least one thin-film EL element having at least a luminescent layer of a luminescent material and a transparent insulation layer disposed between a pair of transparent electrodes; and a housing comprising a light-transmitting front substrate and a light-transmitting rear substrate, said thin-film EL element being housed within said housing, wherein said light-transmitting rear substrate contains a photochromic compound which discolors and darkens in response to an increase in intensity of external light, said photochromic compound being restored to one of an original colorless and a transparent colored condition in response to a decrease in intensity thereof. - View Dependent Claims (2, 3, 4)
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5. A transparent thin-film EL display apparatus comprising:
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at least one thin-film EL element having at least a luminescent layer of a luminescent material and a transparent insulation layer disposed between a pair of transparent electrodes; a housing comprising a light-transmitting front substrate and a light-transmitting rear substrate, said at least one thin-film EL element being housed within said housing; and a thin-layer made of a photochromic compound which discolors and darkens in response to an increase in intensity of external light, said photochromic compound being restored to one of an original colorless and transparent colored condition in response to a decrease in intensity, said thin-layer being disposed at a portion closer to said light-transmitting rear substrate side than said thin-film EL element and within said housing. - View Dependent Claims (6, 7, 8)
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9. A transparent thin-film EL display apparatus comprising:
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at least one thin-film EL element having at least a luminescent layer of a luminescent material and a transparent insulation layer disposed between a pair of transparent electrodes; a housing comprising a light-transmitting front substrate and a light-transmitting rear substrate, said at least one thin-film EL element being housed within said housing; and a transparent film made of a photochromic compound which discolors and darkens in response to an increase in intensity of external light, said photochromic compound being restored to one of an original colorless and a transparent colored condition in response to a decrease in intensity thereof, said transparent film being formed on said light-transmitting rear substrate. - View Dependent Claims (10, 11, 12)
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13. A thin-film EL display apparatus comprising:
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at least one thin-film EL element having at least a luminescent layer of a luminescent material and a transparent insulation layer disposed between a pair of transparent electrodes; a housing comprising a light-transmitting front substrate and a light transmitting rear substrate, said at least one thin-film EL element being housed within said housing; an electro-optical display which is normally transparent and has a light shutter function, disposed at a position further rearward than said thin-film EL element; and a solar cell for generating electrical power in response to intensity of external light and supplying said electrical power to said electro-optical display to cause said light shutter function to be exhibited; wherein said electro-optical display and solar cell are disposed adjacent to said thin film EL element. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification