Optics: measuring and testing – By polarized light examination
Reexamination Certificate
2006-07-18
2006-07-18
Toatley, Jr., Gregory J. (Department: 2877)
Optics: measuring and testing
By polarized light examination
C356S367000, C250S208100, C359S489040
Reexamination Certificate
active
07079245
ABSTRACT:
Light from a light source10is linearly polarized by a polarizer11.Then it propagates via a half-mirror12almost parallel to the normal to a reflective liquid-crystal panel13and falls on the reflective liquid-crystal panel13.The reflected light reflected by the reflective liquid-crystal panel13is received by a detector15via the half-mirror12and an analyzer14.In this state, the reflective liquid-crystal panel13is rotated about an axis almost parallel to the normal to the reflective liquid-crystal panel13and an angle (extinction angle) at which the output signal of detector15reaches minimum is measured. Then, the gap of the reflective liquid-crystal panel13is detected based on the measured extinction angle. It is also possible to measure the output signals of detector15by arranging the analyzer14in a state in which the transmission axis thereof is almost parallel to the polarization direction of the incident light and a state in which it is almost perpendicular thereto and to detect the gap of the reflective liquid-crystal panel13based on the measured signals.
REFERENCES:
patent: 4286843 (1981-09-01), Reytblatt
patent: 5118191 (1992-06-01), Hopkins
patent: 5298972 (1994-03-01), Heffner
patent: 5365067 (1994-11-01), Cole et al.
patent: 5450201 (1995-09-01), Katzir et al.
patent: 5532823 (1996-07-01), Fukui et al.
patent: 5638207 (1997-06-01), Fukuzawa et al.
patent: 5764363 (1998-06-01), Ooki et al.
patent: 5966195 (1999-10-01), Sato et al.
patent: 6081337 (2000-06-01), Kwok et al.
patent: 6275291 (2001-08-01), Abraham et al.
patent: 6369375 (2002-04-01), Ishiwata
patent: 6538754 (2003-03-01), Choi
patent: 6639674 (2003-10-01), Sokolov et al.
patent: 6724215 (2004-04-01), Kuroiwa
patent: 6822737 (2004-11-01), Kurata et al.
patent: 2001/0048528 (2001-12-01), Choi
Choi, Wing-Kit,P-85: Reflective Liquid-Crystal Cell-Gap Measurement Using Input-Polarization-Angle Dependence, SID 02 Digest, Copyright 2002 SID, pp. 530-533.
Stallinga, S.,Equivalent Retarder Approach To Reflective Liquid Crystal Displays, Journal of Applied Physics, vol. 86, No. 9, Dated Nov. 1, 1999, pp. 4756-4766.
Tang, S.T., and Kwok, H. S.,3×3 Matrix for Unitary Optical Systems, J. Opt. Soc. Am.A/vol. 18, No. 9, Sep. 2001, pp. 2138-2145.
Tang, S.T., and Kwok, H.S.,Measurement of Reflective LCD Cell Gap, XP009042601, LCTp2-4, Dated 2000, pp. 109-111.
Tang, S.T., and Kwok, H.S.,Measurement of Reflective Liquid Crystal Displays, Journal of Applied Physics, vol. 91, No. 11, Dated Jun. 1, 2002, pp. 8950-8954.
Wu, Shin-Tson, and Xu, Gang,Cell Gap and Twist Angle Determinations of a Reflective Liquid Crystal Display, IEEE Transactions on Electron Devices, vol. 47, No. 12, Dated Dec. 2000, pp. 2290-2293.
Kurata Tetsuyuki
Maehara Toshiaki
Nishioka Takahiro
Satake Tetsuya
Sato Susumu
Mitsubishi Denki & Kabushiki Kaisha
Nguyen Sang H.
Patterson Thuente Skaar & Christensen P.A.
Toatley , Jr. Gregory J.
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