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15.4: Reflective LCD Cell Gap Measurement by QHQ Compensation Method
Author(s) -
Yu X. J.,
Kwok H. S.
Publication year - 2002
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.1830873
Subject(s) - compensation (psychology) , phase compensation , liquid crystal display , optics , retarder , orientation (vector space) , materials science , acoustics , physics , mathematics , geometry , psychology , phase noise , psychoanalysis , composite material
A phase compensation method is presented for measuring the cell gap of reflective LCD. We use the so‐called QHQ compensator that is made up of two quarter‐wave plates (Q) and one half‐wave plate (H). This method is different from other compensation methods in that we can change both the orientation angle and retardation value of the compensator by rotating the quarterwave and halfwave retarders. As a result, the QHQ compensation method has a higher accuracy and a simpler procedure.