Thorn Emi Plc

Bernard J Green

Ian M Green

David John Gibbons

Andrew N Carrington

Andrew T Rowley

Francis Jones, Deceased

A display device is formed by a matrix of surface-stabilized bi-stable ferroelectric liquid crystal elements each being separately settable by a matrix driver. To provide brightness control or color in the display, all the elements of the matrix are set in accordance with a portion of a signal for display and the amount of light passing through the matrix for that setting is controlled in accordance with the binary significance of the respective portion of the signal. This control is produced by varying one of the activation duration or intensity of a light source, such as sets of fluorescent tubes in accordance with the binary significance of the brightness information in the input signal. Half of the frame time (T) is used for the numerous setting operations on the matrix of elements and half is used for the backlighting operations of the various settings.

Display device incorporating brightness control and a method of

A method of manufacturing a color filter for a liquid crystal cell comprises forming a plurality of patterns, each of a respective dye intermediate material, on a carrier element. The patterns of dye intermediate materials are then brought into contact with a substrate layer, supported on a glass substrate, under the application of heat and pressure. The substrate layer, such as a polyacrylonitrile layer, contains free acid groups which interact with the dye intermediate materials to form the colors of the color filter in the substrate layer. The method permits the actual formation of the colors on the substrate to be effected in a single alignment step, minimizing wastage of the relatively expensive glass substrates. Furthermore, as the dyes providing the colors of the filter are chemically part of the substrate layer, they are very resistant to leaching by the liquid crystal materials.

Method of manufacturing color filters for liquid crystal cells

A liquid crystal device comprises backlighting means to provide illumination from the rear for a liquid crystal panel. The backlighting means has a layer of light-transmitting material formed with a prismatic region at one edge and a plurality of light sources of differing chromatic output, located adjacent the prismatic region.

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Bernard J Green