Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1993-01-27
1994-04-12
Gross, Anita P.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359102, G02F 11335, G02F 113
Patent
active
053030753
ABSTRACT:
A liquid crystal display device having a phase difference plate and a reflector, which is capable of providing a bright display. When the value of the ratio K of the product .DELTA.n1.multidot.d1, where .DELTA.n1 is the optical anisotropy and d1 is the thickness in the vertical direction of the phase difference plate to the product .DELTA.n2.multidot.d2, where .DELTA.n2 is the optical anisotropy and d2 is the thickness of the phase difference plate when inclined at 45.degree. from the vertical direction of the phase difference plate in the direction of the optical axis, is in the range of K.gtoreq.1.20, the optical axis of the phase difference plate is disposed at an angle in the range of from about +30.degree. to about +60.degree. or in the range of from about -30.degree. to about -60.degree. with respect to the direction of observation, where the values of angles are positive when measured clockwise from the observation direction, whereas, when K<1.20, the optical axis of the phase difference plate is disposed at an angle in the range of from about +30.degree. to +120.degree. with respect to the observation direction.
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Ohgawara et al., "A Color STN Display With Two Retardation Compensating Films", 1989 SID International Symposium, Digest of Technical Papers, First Edition, May 1989, pp. 390-392.
Nishizawa Hitoshi
Wada Hiroshi
Gross Anita P.
Seiko Epson Corporation
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