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liquid crystal display laminate and method of manufacturing such

IP.com Disclosure Number: IPCOM000008092D
Publication Date: 2002-May-17

Publishing Venue

The IP.com Prior Art Database

Abstract

NL010757

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PHNL010757

1 24.10.2001 Liquid crystal display laminate and method of manufacturing such

The invention relates to a liquid crystal display laminate, a method of manufacturing such a laminate and a display device comprising such a laminate.

      Liquid crystal (LC) display devices are electro-optical devices capable of modulating the properties of light incident thereon by subjecting the liquid crystal to an electric field. An LC display device typically comprises a display panel having a plurality of

LC pixels, each pixel being individually addressable.

      A liquid crystal panel or cell comprises liquid crystal material which, as the liquid crystal material is a liquid, is disposed between a pair substrates, eg made of glass or plastic, to keep the liquid crystal material in position.

Conventionally, such a liquid crystal cell is manufactured by gluing the pair of

identical substrates together along their perimeter leaving a small opening, evacuating the container so obtained and then filling the container with the liquid crystal material. For example, the LC cells disclosed in US 5,949,508 are manufactured in this manner.

The conventional method of cell manufacturing is laborious and expensive. For example, it takes a long time, typically hours, to fill the cell as the liquid crystal layer is

typically about 5 [mu] m thick and the glass substrates may have a surface area of one square meter. Moreover, the substrates are relatively thin (typically a few hundred [mu] m) which, in combination with the large area makes them very vulnerable and difficult to handle. Additionally, to obtain satisfactory display performance the surface of the substrates needs to be optically smooth. All these and other requirements make the substrates very expensive and

the choice of material for the substrate is typically limited to special kinds of glass, or in some cases plastic. On the other hand, the need exists to go to thinner and lighter liquid crystal cells.

The object of the invention is, inter alia, to provide a liquid crystal display

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laminate and display device comprising such which is cost-effective and which can be manufactured in a manner fundamentally different from the conventional manufacturing process, allowing significant savings in the cost and time of manufacture.

Page 2 of 57

PHNL010757

              2 24.10.2001 This object is, according to the invention, achieved by a liquid crystal laminate comprising a liquid crystal layer, at a side of the liquid crystal layer, a single substrate for confining the liquid crystal layer and, optionally, a cover layer formed adjacent to the liquid crystal layer for covering the liquid crystal layer at a side opposite the substrate side of the liquid crystal layer.

      The substrate for confining the liquid crystal layer has at least the function of providing a surface onto which the liquid crystal layer or the material from which such layer is obtainable may be applied. In accordance with the invention, the...