Abstract:
A color liquid crystal display and display material formed by microdroplets of chiral or cholesteric liquid crystal phase dispersed in a polymeric matrix. The liquid crystal in the microdroplets exhibits strong negative dielectric anisotropy so that in the presence of an electric field the helical planes of the chiral material align perpendicular to the field. Incident light is reflected at a selected wavelength depending upon the helical pitch. In the field-OFF state, the liquid crystal directors are configured or randomly oriented so as to scatter incident light.
Abstract:
An improved apparatus is disclosed for producing and modulating monochromatic light and is characterized by a bright, high contrast display surface. The apparatus includes a linear polarizer positioned between a light source and a liquid crystal cell, and utilizes, as a reflector, a substance with a helical structure. A circular polarizer is positioned between the liquid crystal cell and the reflector.
Abstract:
A cholesteric reflector (100) includes a substrate (110) and a first cholesteric layer (120) which is disposed over the substrate (110) and reflects a first polarization of light within a design waveband. A second cholesteric layer (140) is disposed over the first cholesteric layer (120) and reflects a second polarization of light within the design waveband.
Abstract:
본 발명은 백라이트 유닛용 콜레스테릭 반사판 등에 관한 것이다. 이러한 백라이트 유닛용 반사판은, 입사되는 광을 반사시키도록 백라이트 유닛에 구비된 반사판에 있어서, 입사되는 제1편광 및 제2편광을 반사시키는 콜레스테릭 액정층과, 상기 콜레스테릭 액정층을 통해 미반사된 광을 반사시키도록 배치된 반사층을 포함한다. 따라서, 본 발명은 도광판에서 방출된 광에 대한 반사효율을 제고시켜서 액정 디스플레이 전체의 휘도를 향상시키게 되는 장점이 있다.
Abstract:
Display apparatuses (100;200;400;500;1400) are shown capable of displaying information in a reflective mode using only ambient light (110;210;510) and in a transmissive mode using a light source (105;205;505;1405). In one embodiment, the display apparatus (100;1400) includes a reflecting polarizer (104;1408) disposed between a light modulating layer (102;1402) and an isotropic light cavity (105,106;1405,1406). The light cavity (105;106;1405;1406) reflects incident light with a first degree of depolarization. The reflecting polarizer (104;1408) reflects light with a second degree of depolarization for at least one polarization that is greater than the first degree of depolarization. In another embodiment of the display apparatus (200;1400), a microstructured film (204;1404) is included above a light cavity (205,206;1405,1406) and below a light modulating system (201,202,203,208,1401,1402,1403,1415) where the microstructured film (204;1404) includes sawtooth formations (207;1407) having at least a tilted surface (211,212;1411,1412). In another embodiment of a dual-mode display device (500), the display (500) includes a cholesteric reflecting polarizer (504) disposed between a light modulating layer (502) and a light cavity (505,506) where the light cavity (505,506) causes a polarization phase shift upon reflectance.
Abstract:
The liquid crystal switchable color filter switches between three color bands and is preferably used for time-sequential color devices, as for example projection devices, direct view displays and video cameras. The color filter employs circularly polarizing selective reflection bands of at least four cholesteric filters (89, 91, 93, 95) together with three liquid crystal switches (81, 83, 85) and related retarder layers. Between the first and the second as well as between the third and the fourth cholesteric filter an additional half-wave plate (111, 113) is provided, which makes it possible to use cholesteric filters having all the same handedness. Furthermore, for the blocking state of a color band the optic axis of the corresponding liquid crystal switch is parallel or perpendicular to the polarization direction. This concept simplifies production and still exhibits excellent properties for the color switch. Moreover, it advantageously allows overlapping color transmission bands thus improving the light efficiency.
Abstract:
A liquid display, wherein a printed layer having an opening in the portion thereof which is on the opposite side of an observer of the liquid display, the displaying being done by utilizing the absorption or chromaticity of the printed layer when an external light source is utilized, by passing the light through the printed layer via the opening thereof when an auxiliary light source is turned on, and by applying different voltages to a liquid crystal layer by a gradation inversion circuit when the external light source and auxiliary light source are utilized, the inversion of brightness and darkness of what is displayed by using the external and auxiliary light sources being eliminated by a deflecting plate or a cholesteric liquid crystal polymer film provided on a rear surface of the liquid crystal display, whereby a liquid crystal display of a high visibility can be obtained.