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US 5,311,341 AGranted
Connection structure between a tab film and a liquid crystal panel
AssigneeRohm Co., Ltd.
InventorMinoru Hirai
Life of this patent
Estimating the term…
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AssigneeRohm Co., Ltd.
InventorMinoru Hirai
Estimating the term…
The improved liquid-crystal display device has a slit formed in part of the TAB area where the electrodes on the liquid-crystal display panel are connected to the output terminals on the TAB and the liquid-crystal display panel is bonded to the TAB by means of a first anisotropic conductive adhesive having a comparatively weak adhesive force, such as a thermoplastic anisotropic conductive adhesive, whereas a second anisotropic conductive adhesive having a comparatively strong adhesive force, such as a uv curable adhesive, is coated in the slit. This liquid-crystal display device can be produced by a process that proceeds basically as follows: the electrodes on the liquid-crystal display panel are connected to the output terminals on the TAB by means of a thermoplastic adhesive as the first anisotropic conductive adhesive having a comparatively weak adhesive force; then, the assembly is subjected to an operating test; if the TAB is found to be defective in the operating test, it is replaced and, if no defect is found, a uv curable or a thermosetting adhesive as the second anisotropic conductive adhesive having a comparatively strong adhesive force is coated in the slit and then cured as the output terminals are compressed against the electrodes.
A liquid-crystal display device comprising a liquid-crystal display panel having a plurality of electrodes arranged thereon as they are partly exposed at an end of said panel and a flexible film having an IC mounted thereon for driving at least one of said electrodes, said flexible film having at least one lead wire formed thereon serving as an output terminal for said IC, a slit being formed in a region of said flexible film which corresponds to an area of connection where said lead wire is to be connected to one of said electrodes, so that part of said lead wire is exposed in said slit, one of said electrodes and said lead wire being connected by a first adhesive of an anisotropic conductive type except in the area corresponding to said slit, said first adhesive of an anisotropic conductive type having such a weak adhesive force that one of said electrodes as connected to said lead wire can be separated without being damaged, the part of said lead wire which is exposed in said slit being connected to one of said electrodes by a second adhesive of either an insulating type or an anisotropic conductive type that has a greater adhesive force than said first adhesive of an anisotropic conductive type.
A liquid-crystal display device comprising a liquid-crystal display panel having a plurality of electrodes arranged thereon as they are partly exposed at an end of said panel and a flexible film having an IC mounted thereon that is connected to said electrodes for driving them, said flexible film having a plurality of lead wires formed thereon serving as output terminals for said IC, a slit being formed in a region of said flexible film which corresponds to an area of connection where said lead wires are to be connected to the respective electrodes, so that part of said lead wires are exposed in said slit, said electrodes and said lead wires being connected by a first adhesive of an anisotropic conductive type in the area of connection excepting the area corresponding to said slit, and the part of said lead wires which is exposed in said slit being connected to said electrodes by a second adhesive of either an insulating type or an anisotropic conductive type that has a greater adhesive force that said first adhesive of an anisotropic conductive type.
In a liquid-crystal display device comprising a liquid-crystal display panel having a plurality of electrodes arranged in an end portion of the panel and a circuit board made of a flexible resin that has a liquid-crystal drive IC mounted thereon, a plurality of output terminals being provided on the surface of said circuit board and connected respectively to said electrodes, the improvement wherein a through slit is formed in said circuit board to expose at least part of said output terminals in the area where said circuit board is to be connected to said liquid-crystal display panel, said liquid-crystal display panel being connected to said circuit board by means of a thermoplastic anisotropic conductive first adhesive between said electrodes and said output terminals and by either a uv curable or a thermosetting second adhesive that is coated in said slit and separate from said first adhesive.
A liquid-crystal display device, comprising:
An electronic display device, comprising:
Dependencies are inferred from the claim text.