LCD system having improved contrast ratio

Details LCD system having improved contrast ratio LCD system having improved contrast ratio

1990-08-24

1992-06-23

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 62, 359 74, 359 87, 359 93, G02F 113

Patent

active

051248182

ABSTRACT:
An LCD display system is formed by stacking two or more independently operated LCD elements. By exploiting the birefringent effect of STN nematic liquid crystals a full range of colors may be displayed. Display rows in the stacked panels are preferably interlaced to achieve high display resolution. Optics are desirably included to collimate light, illuminating the stacked elements, to reduce parallax effects and to disperse light exiting the stacked elements to permit wide angle viewing. The contrast between a pixel in the dark state and in the white state of the high resolution display system may be increased by modifying the .DELTA.nd product of the liquid crystal in the passive regions to compensate for the natural birefringence of the liquid crystal in optically aligned active regions.

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T. J. Scheffer and J. Nehring, Investigation of the electrooptical properties of 270.degree. chiral nematic layers in the birefringence mode, Oct. 15, 1985, J. Appl. Phys., vol. 58, No. 8, pp. 3022-3031.

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