JPS5485745A - Liquid crystal display body - Google Patents

Abstract

PURPOSE: To make possible free inversion of the color of the ground of the liquid crystal display body and the color of formats or partial white and black inversion use of the liquid crystal display body by providing double refracting material between the electrode plate and polarizing plate of the liquid crystal cell.

CONSTITUTION: Natural light 14 enters an upper polarizing plate 7 and transmitted lights 15, 21 are polarized in the arrow directions. At the time when the lights 15, 21 pass through a TN type liuid crystal display body 8, they straightly transmit through the field applied portion 9 and become the polarized light 17 of the same direction as that of the light 21 but are subjected to rotatory polarization of about 90° in the portion 10 where no electric field is applied, becoming the polarized light 16 in the direction orthogonal to the liqht 15 after transmission. Next, at the time of the transmitting through a double differacting plate 11 in which the velocity of light differs in (x) and (y) axis directions, the light becomes circularly polarized light. The thickness of the plate 11 is suitably selected so that the polarized lights 16, 17 become respectively orthogonal polarized lights 18, 19. Further, they are screened by the lower polarizing plate 12 so that only the polarized light 19 transmits therethrough and is then reflected by a reflecting plate 13 and therefore it becomes bright, while the polarized light 18 becomes dark. If there is no plate 11 in contrast with this, the brightness and darkness are reversed.

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