Process for the production of an impact-resistant liquid crystal switching and display device
AssigneeHoechst Aktiengesellschaft
InventorsClaus Escher, Gerhard Illian, Norbert Rosch, Takamasa Harada
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Abstract
Addition of coronands and cryptands to FLC-mixtures makes it possible to bring the FLC material into a homogeneous "bookshelf" or "quasi-bookshelf" geometry. When such a FLC mixture is used, displays which have been shock-damaged can be regenerated by applying a suitable electric field for a short period of time.
Claims9
A process for producing a liquid crystal switching and display device which is shock-resistant and in which two connected support plates, at least one of which has an orientation layer, are provided with electrodes and at least one polarizer and a liquid-crystalline material is poured into the gap between the two support plates, wherein the liquid-crystalline material is a ferroelectric liquid crystal mixture containing at least one liquid-crystalline base component and furthermore at least one cryptand or coronand, which comprises applying a continuous periodic electric voltage to the electrodes of the switching and display device in the ferroelectric phase before startup, until the liquid crystal layer adopts a "bookshelf" or "quasi-bookshelf" orientation.
A process for regenerating a liquid crystal switching and display device which has been shock damaged and contains two support plates, at least one orientation layer, an adhesive frame, electrodes, at least one polarizer and a liquid-crystalline material, in which the liquid crystal layer was originally present in a "bookshelf" or "quasi-bookshelf" orientation, wherein the liquid crystal layer is a ferroelectric liquid crystal mixture containing at least one liquid-crystalline base component and furthermore at least one coronand or cryptand, which comprises applying a continuous periodic square voltage to the electrodes of the shock-damaged switching and display device.
Dependencies are inferred from the claim text.