LCD heater utilizing Z-axis conductive adhesive to attach bus bars to ito
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 for heating said liquid crystal layer, said heater including a heating conductive layer with first and second bus bars adhered thereto;
each of said first and second bus bars including a metallic material that forms the majority of each bus bar, and a conductive coating that is coated on said metallic material; and
wherein a flexible Z-axis conductive adhesive is utilized to adhere each of said first and second bus bars to said heating conductive layer so as to reduce thermal stresses induced on solder connections between said bus bars and wires soldered thereto, said Z-axis adhesive including a plurality of conductive particles therein and allowing current flow in substantially only the Z-axis direction between the heating conductive layer and the bus bars.
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Abstract
An LCD heater includes a substantially transparent conductive heater layer (e.g. ITO) deposited on a transparent sheet. Attached to the conductive layer are a pair of tin coated bus bars, each of which is adhered to the conductive layer via a Z-axis conductive adhesive that reduces thermal stresses induced on solder connections between the bus bars and wires soldered thereto.
40 Citations
7 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 for heating said liquid crystal layer, said heater including a heating conductive layer with first and second bus bars adhered thereto; each of said first and second bus bars including a metallic material that forms the majority of each bus bar, and a conductive coating that is coated on said metallic material; and wherein a flexible Z-axis conductive adhesive is utilized to adhere each of said first and second bus bars to said heating conductive layer so as to reduce thermal stresses induced on solder connections between said bus bars and wires soldered thereto, said Z-axis adhesive including a plurality of conductive particles therein and allowing current flow in substantially only the Z-axis direction between the heating conductive layer and the bus bars. - View Dependent Claims (2, 3, 4, 6, 7)
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5. A method of making a liquid crystal display, the method comprising the steps of:
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providing a substantially transparent substrate; forming a substantially transparent heating conductive layer on said substantially transparent substrate; utilizing a Z-axis conductive adhesive to adhere first and second bus bars to the heating conductive layer; connecting at least one conductive wire to each of said first and second bus bars; and providing the substantially transparent substrate, heating conductive layer, and bus bars on a display including liquid crystal material therein; and applying current or voltage to the bus bars so as to heat the heating conductive layer thereby heating the liquid crystal material.
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Specification