Liquid-crystal display
AssigneeCitizen Watch Co., Ltd.
InventorYasushi Kaneko
Life of this patent
Estimating the term…
Abstract
A reflection-type liquid crystal display device of single polarizing film type, comprises a liquid crystal element (20) comprised of twisted nematic liquid crystal (6) sandwiched between a first substrate (1) provided with a reflector (7) and first electrodes (3), and a second substrate (2) provided with second electrodes (4), and a twisted retardation film (12), a first retardation film (13), a second retardation film (14), a polarizing film (11) that are disposed in sequence on the outer side of the second substrate (2), so that black display having a low reflectance is obtained over the all-wavelength region, thereby effecting bright display in high contrast.
Claims23
A liquid crystal display device comprising:
- a liquid crystal element comprised of twisted nematic liquid crystal sandwiched between a first substrate provided with a reflector and first electrodes, and a second substrate provided with second electrodes;
- a twisted retardation film disposed on the outer side of the second substrate;
- a first non-twisted retardation film disposed on the outer side of the twisted retardation film;
- a second non-twisted retardation film disposed on the outer side of the first retardation film;
- and
- a polarizing film disposed on the outer side of the second retardation film.
A liquid crystal display device comprising:
- a liquid crystal element comprised of twisted nematic liquid crystal sandwiched between a first substrate provided with a transflective reflector and first electrodes, and a second substrate provided with second electrodes;
- a twisted retardation film disposed on the outer side of the second substrate;
- a first retardation film disposed on the outer side of the twisted retardation film;
- a second retardation film disposed on the outer side of the first retardation film;
- a first polarizing film disposed on the outer side of the second retardation film;
- a third retardation film disposed on the outer side of the first substrate;
- a second polarizing film disposed on the outer side of the third retardation film;
- and
- a backlight disposed on the outer side of the second polarizing film,
- wherein retardation value of the third retardation film is substantially equivalent to a quarter-wavelength.
Dependencies are inferred from the claim text.