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Abstract

Active matrix screen for the color display of television images or pictures, control system and process for the production of the screen. The screen utilizes the electrically controlled birefringence effect and comprises an assembly having a nematic liquid crystal layer (2) with a positive optical anisotropy between an active matrix having transparent control electrodes (8) and a transparent counterelectrode (10) equipped with colored filters (13) and two polarizing means (12,14), which are complimentary of one another and are located on either side of the assembly. The optical path in the layer is at the most equal to approximately 0.6 micrometer. The system comprises means for amplifying the blue, green and red video signals, whereof the respective gains are regulated so as to be able to display a neutral white shade. According to the process, it is possible to produce between one of the polarizing means and the assembly, a birefringence compensating layer (16) essentially corresponding to the same optical path as the liquid crystal layer. (FIG. 1).

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First Claim