Importance

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Abstract

A reflective type liquid crystal display device is achieved with enhanced brightness and contrast ratio utilizing only one polarizing plate or polarizer and a refelctor in combination with a liquid crystal cell wherein the light propagating through the liquid crystal cell to the reflector is substantially of linear polarization. By employing a single polarizer, the effective brightness and contrast of the display can be increased by about 12% and the multi-coloring effect in a monochromatic black/white display can be significantly reduced. To obtain an ideal brightness level, linearly polarized light, which enters the liquid crystal cell through the single polarizer, is required to be transmitted twice through the liquid crystal layer and then passed again through the polarizer under the same conditions as in the case of obtaining linear polarization utilized in the transmissive type mode employing two parallel polarizing plates. In a futher embodiment of the invention, the multi-coloring effect can be further reduced or resolved by providing a light scattering surface on the reflector.

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First Claim