Browse Prior Art Database

Packaging of Liquid Crystal Displays

IP.com Disclosure Number: IPCOM000077375D
Original Publication Date: 1972-Jul-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Aviram, A: AUTHOR

Abstract

In the manufacture of liquid-crystal display devices, the liquid-crystal material is generally sandwiched between two transparent electrodes on a glass support. The transparent electrodes are of a material such as tin oxide. It has been found desirable to seal these devices at their edges to prevent contact with oxygen and with moisture, and to prevent the leakage of the liquid crystal from the device. There is disclosed herein a method for sealing the devices hermetically, such method being adaptable as an automated process.

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Packaging of Liquid Crystal Displays

In the manufacture of liquid-crystal display devices, the liquid-crystal material is generally sandwiched between two transparent electrodes on a glass support. The transparent electrodes are of a material such as tin oxide. It has been found desirable to seal these devices at their edges to prevent contact with oxygen and with moisture, and to prevent the leakage of the liquid crystal from the device. There is disclosed herein a method for sealing the devices hermetically, such method being adaptable as an automated process.

The method comprises first the step of the depositing of a transparent electrode on a surface of a plastic material body by evaporation or other suitable techniques. The plastic material should suitably have the following properties: a) Transparency b) Thermoplasticity c) High dipole moments and the capability of being sealed by dielectric RF heating, an example of a plastic material being polyvinyl chlorides. d) As an alternative to (c) hereinabove, relatively small dipole moments and capability of being sealed by heat sealing or by ultrasonic sealing.

In the carrying out of the technique, the area of the transparent electrode deposited on the plastic body is preferably smaller than that of the plastic body in order to leave the edges of the plastic body bare, whereby they can be sealed without the causing of shorts.

Reference is made to the figure for an illustration of the carrying out of the disclosed...