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| Electro-optic apparatus, electronic apparatus therewith, and manufacturing method therefor |
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| Tamper-indicating sheet |
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| Optically variable and machine-readable device for use on security documents |
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Liquid crystal display device
| Details |
Inventors: Kaneko, Yasushi;
Assignee: Citizen Watch Co., Ltd. (Tokyo, JP)
Primary Examiner: Malinowski; Walter J.
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Westerman, Hattori, McLeland & Naughton, LLP
An STN liquid crystal element, formed to sandwich a nematic liquid crystal 6 twist-aligned at an angle ranging from 180 degrees to 270 degrees between a first substrate 1 having a first electrode and a second substrate 2 having a second electrode, is disclosed. A polarizing film is disposed outside the second substrate of the STN liquid crystal element through a retardation film or a twisted retardation film, a cholesteric liquid crystal polymer sheet is disposed outside the first substrate through a quarter-wave film, and a light absorbing film is disposed outside the cholesteric liquid crystal polymer sheet, to thereby form a liquid crystal display device which enables metallic color display. |
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DETAILED DESCRIPTION The present invention is made to solve the above-mentioned disadvantages and a first object of the present invention is to provide a liquid crystal display device which has a good viewing angle characteristic and can perform single-color display with a colorful tone and a higher contrast even in a high-density liquid crystal display device having 100 or more scan lines.
A second object of the present invention is to provide a liquid crystal display device which can perform multi-color display in two or more colors and with a colorful tone and a higher contrast.
A third object of the present invention is to provide a liquid crystal display device which realizes sufficient brightness even at night using backlight illumination.
To achieve the above-mentioned first object, the present invention provides a liquid crystal display device composed of: an STN liquid crystal element arranged to sandwich a nematic liquid crystal twist-aligned at an angle ranging from 180 degrees to 270 degrees between a first substrate having a first electrode and a second substrate having a second electrode; a retardation film provided outside the second substrate; a polarizing film provided outside the retardation film; a quarter-wave film provided outside the first substrate; a cholesteric liquid crystal polymer sheet provided outside the quarter-wave film and a light absorbing film provided outside the cholesteric liquid crystal polymer sheet.
A twisted retardation film can be used as the retardation film.
Also, the liquid crystal display device can be composed of: a TN liquid crystal element arranged to sandwich a nematic liquid crystal twist-aligned at an angle of approximately 90 degrees between a first substrate having a first electrode and a second substrate having a second electrode; a polarizing film provided outside the second substrate; a quarter-wave film provided outside the first substrate; first cholesteric liquid crystal polymer sheets provided outside the quarter-wave film; a second cholesteric liquid crystal polymer sheet provided outside the first cholesteric liquid crystal polymer sheet; and a light absorbing film provided outside the second cholesteric liquid crystal polymer sheet, wherein the first cholesteric liquid crystal polymer sheet and the second cholesteric liquid crystal polymer sheet have different scattering center wavelengths and have respective twist directions in the same direction
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