US 5,317,438 A · Liquid crystal display device and method of producing the same having an improved connection between a flexible film substrate and a drive circuit substrate

Abstract

A liquid crystal display device using a flexible film as a panel substrate is produced such that the panel substrate is connected to a drive circuit substrate detachable for reuse, that transparent electrodes on the panel substrate are free of damage from conductive particles in the connection, and that a hotmelt adhesive for connection may be prevented by a simple arrangement from being deteriorated with outside air. The liquid crystal display device employs the panel substrates of flexible film, in which transparent electrode terminals formed on the panel substrate are connected to wiring terminals formed on a drive circuit substrate. A radiation-setting adhesive such as an ultraviolet-curing adhesive and a photo-setting adhesive is coated on a surface of a connection portion forming the transparent electrode terminals of the panel substrate. Conductive members are projectively provided on a surface of a connection portion forming the wiring terminals of the drive circuit substrate. A hotmelt adhesive covers a surface of the drive circuit substrate including the conductive members.

Claims14

Dependent claims

A liquid crystal display device in which a flexible film is used as a panel substrate and in which a transparent electrode terminal formed on said panel substrate in connected to a wiring terminal formed on a drive circuit substrate wherein:

a radiation-setting adhesive is coated on a surface of a connection portion forming the transparent electrode terminal of the panel substrate;
a conductive member is projectively provided on a surface of a connection portion forming the wiring terminal of the drive circuit substrate;
a hotmelt adhesive covers a surface of the drive circuit substrate including the conductive member;
and
said hotmelt adhesive softens at a temperature below a glass transition point of a polymer film for said panel substrate.

2 more elements

A process for producing a liquid crystal display device in which a flexible film is used as a panel substrate and in which a transparent electrode terminal formed on said panel substrate is connected to a wiring terminal formed on a drive circuit substrate, comprising:

coating a radiation-setting adhesive on a surface of a connection portion forming the transparent electrode terminal of the panel substrate;
projectively providing a conductive member on a surface of a connection portion forming the wiring terminal of the drive circuit substrate;
covering a surface of the drive circuit substrate including said conductive member with a hotmelt adhesive;
heat-pressing the connection surfaces of the panel substrate and the drive circuit substrate positioned with each other at a temperature below a glass transition point of the panel substrate to remove most of said radiation-setting adhesive therefrom to connect the transparent electrode terminal through said conductive member projectively provided to the wiring terminal in a temporary fix state;
inspecting the device;
and
alternatively selecting a step to follow based on a result of the inspection from:
effecting a final hardening of said radiation-setting adhesive for connection;
and
breaking the temporary fix state then to connect said panel substrate to another drive circuit substrate in said above steps.

7 more elements

Dependencies are inferred from the claim text.

Liquid crystal display device and method of producing the same having an improved connection between a flexible film substrate and a drive circuit substrate

Life of this patent

Liquid crystal display device and method of producing the same having an improved connection between a flexible film substrate and a drive circuit substrate

Life of this patent

Abstract

Claims14