Method and apparatus for producing liquid crystal displays, and a liquid crystal display produced thereby

• US 4,222,635 A
• Filed: 01/11/1978
• Issued: 09/16/1980
• Est. Priority Date: 01/28/1977
• Status: Expired due to Term

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: BBC Brown Boveri & Company Limited (ABB Limited)
• Inventors: Julke, Elias
• Primary Examiner(s): Bauer, Edward S.
• Application Number:
  US05/868,697
• Time in Patent Office: 979 Days
• Field of Search: 350/331, 350/343, 350/344, 350/69, 350/178, 350/320, 156/272, 156/360, 356/352
• US Class Current: 349/190
• CPC Class Codes: G02F 1/1339 Gaskets; Spacers; Sealing of cells
• CPC Class Codes: Y10S 359/90 Methods

Abstract

A method and apparatus for producing a liquid crystal display (LCD) whereby the two planar cell wall elements of the LCD are separated by an adhesion web made of a preparation which is polymerized into a solid, transparent adhesive bonding by the application of actinic radiation. The two planar cell wall elements, one of which is provided with the web preparation are mounted in a device which guides the cells toward one another. Upon reaching a predetermined measured separation distance, the cells are exposed to a source of actinic radiation, thereby polymerizing the web preparation into a suitable adhesion bonding between the two planar display elements.

Claims

1. In a method of producing cells for liquid crystal displays, consisting of two planar cell wall elements of which at least one is light-transmissive, said cell wall elements adhesively bonded in order to form between said cell wall elements a planar cell cavity suitable for receiving liquid crystal compositions, the improvement comprising:

selecting an adhesive bonding made of a preparation which can be irreversibly set by actinic radiation,

applying an adhesive web made of said adhesive bonding made of said preparation to at least one of said cell wall elements, said adhesion web applied to a thickness greater than a predetermined value for the thickness of said planar cell cavity,

pushing said cell wall elements against one another,

measuring continuously using optical measuring means the distance between said cell wall elements as said cell wall elements are pushed against one another, and

polymerizing abruptly said adhesive bonding by exposing said bonding to actinic radiation when the measured value of thickness of said cell cavity equals said predetermined value of thickness, said polymerization resulting in practically no further reduction of said thickness of said cell cavity upon further pushing of said cell wall elements against one another.

2. In a method according to claim 1, the improvement of said step of exposing to actinic radiation further comprising:

exposing said preparation by means of a light flash.