Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2007-02-06
2007-02-06
Dudek, James A. (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S115000
Reexamination Certificate
active
10523621
ABSTRACT:
This invention relates to a transflective liquid crystal display device, having a plurality of pixels (1), each comprising a liquid crystal layer (2) being sandwiched between a front and a back substrate (4, 5), a back light (10), a semi-transparent reflective element (7), being arranged between the back substrate (5) and the back light (5), a front polarizer (6), and a driving arrangement (3) for controlling optical properties of the liquid crystal layer (2), whereby the pixel is subdivided into a reflective pixel part (1a) and a transmissive pixel part (1b). According to the invention, a cholesteric layer composition (11, 12) is arranged between said liquid crystal layer (2) and the back substrate (5), said cholesteric layer composition comprising; in said reflective pixel part (1a), a first cholesteric layer composition part (11) for reflecting a desired primary pixel color, and in said transmissive pixel part (1b) a second cholesteric layer composition part (12) for reflecting the remaining primary colors, other than said desired primary pixel color.
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patent: 2001/0020990 (2001-09-01), Moon
patent: 2001/0055083 (2001-12-01), Jiang et al.
patent: 2002/0135719 (2002-09-01), Moon et al.
patent: 2003/0128319 (2003-07-01), Maeda
patent: 1217421 (2002-06-01), None
patent: 2000131684 (2000-05-01), None
Dudek James A.
Koninklijke Philips Electronics , N.V.
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