LCD heater with flex circuit buss bars
First Claim
Patent Images
1. A liquid crystal display comprising:
- first and second polarizers sandwiching a liquid crystal layer therebetween;
electrode means for applying a voltage across said liquid crystal layer;
a heater means for heating said liquid crystal layer, said heater means including a conductive layer with a flex buss bar mounted thereon;
a substantially flat and transparent substrate having said heater means mounted thereon, said substrate being subject to stress concentrations;
said substrate and said heater means being disposed adjacent said first polarizer, said flex buss bar for delivering power to said conductive layer thereby substantially heating said conductive layer and enabling said conductive layer to heat said liquid crystal display, and wherein said flex buss bar is sufficiently thin so that substantially no gap is provide adjacent said heater means whereby said stress concentrations are substantially eliminated.
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Accused Products
Abstract
An LCD heater includes a substantially transparent ITO heating layer deposited on a transparent glass rear cover sheet, the ITO layer being mounted adjacent a planar surface of the display'"'"'s rear polarizer. The ITO layer has a pair of substantially parallel flex circuit buss bars adhered thereto, the buss bars being sandwiched between the rear polarizer and the ITO heater layer.
57 Citations
15 Claims
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1. A liquid crystal display comprising:
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first and second polarizers sandwiching a liquid crystal layer therebetween; electrode means for applying a voltage across said liquid crystal layer; a heater means for heating said liquid crystal layer, said heater means including a conductive layer with a flex buss bar mounted thereon; a substantially flat and transparent substrate having said heater means mounted thereon, said substrate being subject to stress concentrations; said substrate and said heater means being disposed adjacent said first polarizer, said flex buss bar for delivering power to said conductive layer thereby substantially heating said conductive layer and enabling said conductive layer to heat said liquid crystal display, and wherein said flex buss bar is sufficiently thin so that substantially no gap is provide adjacent said heater means whereby said stress concentrations are substantially eliminated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A heater assembly for a liquid crystal display, said heater assembly comprising:
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a conductive layer disposed on a transparent substrate; means for energizing said conductive layer in order to heat said liquid crystal display, said means including a pair of flex buss bars mounted on said conductive layer; said flex buss bars each having a first and second portion, said first portion being adhered and parallel to said conductive layer, and said second portion extending outwardly from the periphery of said conductive layer; wherein said first and second portions of said flex buss bars include a base polyimide layer and a conductive trace layer, said trace layers of said first portions being in electrical contact with said conductive layer; and wherein said transparent substrate and said conductive layer have beveled peripheral corner areas from which said second portions of said flex buss bars extend. - View Dependent Claims (13, 14)
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15. A process of making a liquid crystal display, said process comprising the steps of:
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a) providing first and second polarizers sandwiching a liquid crystal layer therebetween; b) providing electrodes for applying a voltage across said liquid crystal layer; c) disposing a heater adjacent said first polarizer, said heater including a conductive layer and a substantially planar flex buss bar disposed on a substantially flat and transparent substrate, said buss bar for delivering power to said conductive layer thereby substantially heating said conductive layer and enabling said conductive layer to heat said liquid crystal display and wherein said flex buss bar is sufficiently thin so that substantially no gap is provided adjacent said heater whereby stress concentrations are substantially eliminated.
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Specification