PURPOSE: To enable displayings which are substantially equal as a whole and are good in both of reflection type and transmission type, by changing the density in both colors of the liquid crystal layer groups on both sides of a translucent plate by changing the density and thickness of the respective liquid crystal layers.
CONSTITUTION: A liquid crystal element is disposed with a milky glass plate 3 of 0.5mm thickness as a translucent plate 3 having both reflectivity transmittance provided with transparent electrodes 3', 3" at the intermediate of glass substrates 1, 2 having transparent electrodes 1', 2' on the liquid crystal sides. Nematic liquid crystals 61, 62 having positive dielectric anisotropy dissolved with a black dichromatic dye of the same density are held between the respective substrates to about 10μ so as to be oriented in parallel. Polarization plates 7, 7' are held oppositely in contact with the outside surfaces of the substrates 1, 2 whereby the liquid crystal display element is constituted. A light source for illumination is put behind the element so that the element acts as a reflection type. The element acts as a transmission type in the daytime when external light is strong. When the element is observed in the nighttime where there is no external light or in a room or in a twilight state, the density and contrast of the displayed color do not change and there is no deviation nor out of focus of the display in either case.
| WO/2011/162040 | IMAGE DISPLAY DEVICE AND IMAGE DISPLAY METHOD |
| JPH06110028 | LIQUID CRYSTAL ELEMENT |
| JPS545755 | LIQUID CRYSTAL DISPLAY BODY |
OKAZAKI NETSUO
OKADA YUTAKA
