Broadband quarter-wave film device including in combination...

Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only

Reexamination Certificate

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C349S096000

Reexamination Certificate

active

06922221

ABSTRACT:
A quarter-wave film having a wide bandwidth is invented. A preferred device configuration includes a chromatic half-wave film adjacent to a twisted nematic liquid crystal (TN-LC) film. When a linear polarizer is attached to the side of chromatic half-wave film and the angles of all the optical components are properly set, the combination of chromatic half-wave film and TN-LC film behaves as a broadband quarter-wave film. Based on this idea, a broadband circular polarizer is invented if the linear polarizer, the chromatic half-wave film and the TN-LC film are combined together. In addition, this idea can also be applied to reflective liquid crystal display devices, which include a linear polarizer, a chromatic half-wave film, a TN-LC cell and a reflector.

REFERENCES:
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patent: 6710831 (2004-03-01), Winker et al.
patent: 6765635 (2004-07-01), Kelly et al.
patent: 6795149 (2004-09-01), Vogels et al.
Jian et al., (Retardation-film-compensated reflective bistable twisted nematic liquid crystal displays, Applied Optics, Jul. 1st, 2003, vol. 42, No. 19.
Wu et al., “Design Optimization of Broadband Linear Polarziation Converter Using Twisted Nematic Liquid Crystal”, University of Central Florida, Nov. 19, 2002.□□.
Yoon et al., “Nontwist quarter-wave liquid crystal cell for a high-contrast reflective display”, Optical Society of America, Jul. 1, 2000.
S. Pancharatnam, Achromatic Combinations of Birefringent Plates, Memoir No. 71 of Raman Research Institute, Bangalore, Mar. 5, 1955, pp 130-136.
Tae-Hoon Yoon, et al., Nontwist quarter-wave liquid-crystal cell for a high-contrast reflective Display, 2000 Optical Society of America, Oct. 15, 2000, vol. 25, No. 20, Optics Letters, pp 1547-1549.

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