Display device

Details Display device Display device

2008-03-18

2008-03-18

Nelms, David (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S117000, C340S815860, C340S815750, C340S815560, C362S023000

Reexamination Certificate

active

07345718

ABSTRACT:
When a polarization axis of a first polarizing plate is parallel to that of a second polarizing plate, a light emitted from a backlight is transmitted, on the other hand, when a polarization axis of the first polarizing plate is orthogonal with that of the second polarizing plate, a light emitted from the backlight is mostly blocked off. A character and scale are constructed by a ½λ phase difference plate, so that the emitted light from the backlight, which enters to the character and scale, has a deflection direction reverse to that of the first polarizing plate. When the light emitted from the backlight is blocked, differently from a conventional artificial (pseudo) black color, a color extremely close to black color is seen. The contrast ratio and visibility are improved.

REFERENCES:
patent: 6911238 (2005-06-01), Okawa et al.
patent: 7110064 (2006-09-01), Kameda
patent: 2007/0064168 (2007-03-01), Shiraogawa et al.
patent: 6-885 (1994-01-01), None
patent: 10-301103 (1998-11-01), None

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