Stacked liquid cell
Publication Date: 2002-May-17
The IP.com Prior Art Database
Stacked liquid cell
The invention relates to a stacked liquid cell, such as a stacked liquid crystal cell for use in a stacked display device, in particular a liquid crystal display device.
The invention further relates to a method of manufacturing a liquid cell, in particular a stacked liquid cell.
Stacked liquid cells, in particular stacked liquid crystal cells, and displays comprising such cells are as such known in the art. A stacked liquid cell generally comprises a plurality of cells (sub-cells) stacked one on top of the other. Each (sub-)cell comprises a liquid layer dispersed between substrate layers which serve to separate and confine the liquid
layers during use and/or manufacture. The sub-cells together form a stack of liquid layers dispersed between substrate liquid layers, in which substrate layers may be shared between (sub-)cells. In a stacked liquid crystal cell at least one but typically all liquid layers are electro-optically active liquid crystal layers.
Such stacked LC cells may have advantages compared to single liquid layer
devices. For example, in multi-color or full color display devices use of a stacked liquid cell may increase the active display area available per color by as much as a factor of three. A cholesteric display having a stack of cholesteric liquid crystal layers the pitch of which is selected such that R G and B is reflected in different layers is an exmaple. As another example, a first liquid layer may be a liquid crystal layer and a second liquid layer may serve
as a temperature compensated compensation layer for the first liquid crystal layer.
However, on the down side, stacked liquid crystal cells are relatively thick and the distance between the liquid layers is relatively large. Such a large thickness is generally undesirable. Furthermore, in stacked liquid cells where the liquid layers are partitioned to form individually addressable pixels the large thickness may lead to substantial parallax
effects. The thickness of the stacked liquid cell and the distance between the liquid layers is, to a large extent, caused by the relatively thick substrates between which the liquid layers are dispersed.
It is an object of the invention, inter alia, to alleviate these drawbacks and provide a stacked liquid cell having a relatively small thickness. More in particular, for example in case of a pixelated stacked display cell, the stacked liquid cell is to have a structure which allows parallax effects to be reduced. Furthermore, the stacked liquid cell is
to allow facile and cost effective manufacture. In particular, the stacked liquid cell, or at least a substantial part thereof, is to be such as to be capable of being manufactured in a continuous process, or even a roll-to-roll process.
This object is, in accordance with the invention, achieved by a stacked liquid cell comprising a stack of liquid layers and substrate layers, wherein each l...