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| Integrated television and internet information system |
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Polarizing element, optical element, and liquid crystal display
| Details |
Inventors: Hara, Kazutaka;
Assignee: Nitto Denko Corporation (Ibaraki, JP)
Primary Examiner: Tsai; Jey
Assistant Examiner:
Attorney, Agent or Firm: Westerman, Hattori, Daniels & Adrian LLP
A polarizing element and an optical element are provided that can form a semitransparent or other type of liquid crystal display which is excellent in contrast in a reflective display mode and also is excellent in luminance in a transmissive display mode utilizing a reflective polarizing plate. A polarizing element comprising a reflective polarizing plate and an absorptive polarizer, wherein the reflective polarizing plate separates an incident natural light into a reflected light and a transmitted light each comprising a polarized light, and the absorptive polarizer is arranged on one side of the reflective polarizing plate so as to transmit a polarized light comprising the transmitted light. Also, an optical element comprising this polarizing element; and (a) a quarter wavelength plate or (b) an absorptive polarizing plate and a quarter wavelength plate arranged on the side of the absorptive polarizer in the polarizing element, wherein the absorptive polarizing plate has an axial relation so as to transmit a polarized light transmitted through the absorptive polarizer. While accomplishing the function as a semitransparent reflective polarizer utilizing the reflective polarizing plate, in a transmissive display mode, high luminance display can be achieved with high contrast, and in a reflective display mode, unnecessary reflected light (returned light) of an external light can be absorbed and cut off efficiently. |
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DETAILED DESCRIPTION What is claimed is: 1.
A display comprising a liquid crystal cell and a polarizing element, the polarizing element comprising a reflective polarizing plate and an absorptive polarizer, wherein the reflective polarizing plate separates an incident natural light into a reflected light and a transmitted light each comprising a polarized light; the absorptive polarizer is arranged on a side of the reflective polarizing plate opposed to the liquid crystal plate so as to transmit a polarized light comprising the transmitted light, and the absorptive polarizer comprises an absorptive polarizing plate arranged so that a transmission axis of the absorptive polarizer with respect to the transmitted light comprising a linearly polarized light is in parallel with the polarizing direction of the linearly polarized light.
2.
The display according to claim 1, wherein the reflective polarizing plate comprises a linearly polarized light separation plate.
3.
The display according to claim 2, wherein the linearly polarized light separation plate comprises a dielectric multilayer film.
4.
The display according to claim 2, wherein the linearly polarized light separation plate comprises a laminate of multiple thin films different in refractive index anisotropy.
5.
The display according to claim 2, wherein the linearly polarized light separation plate and the absorptive polarizing plate are fixed with each other through an acrylic adhesive layer.
6.
The display according to claim 1, wherein: the reflective polarizing plate comprises a circularly polarized light separation plate; and the absorptive polarizer comprises a circularly polarizing plate arranged so that its rotating direction with respect to the transmitted light comprising a circularly polarized light is the same as the rotating direction cf the circularly polarized light.
7.
The display according to claim 6, wherein the circularly polarized light separation plate comprises an oriented film of a cholesteric liquid crystal polymer
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