Patent ID: 7671946
Filing Date: 2010-03-02
Classification: G02F,G03B,H04N

Abstract:
1. A method of lessening unwanted effects from a residual in-plane retardance of a liquid crystal display (LCD) panel for an incident light beam having a pre-determined polarization, the method comprising the steps of: a) optically coupling a trim retarder with the LCD panel, the trim retarder having an in-plane retardance greater than the residual in-plane retardance of the LCD panel; b) orienting the trim retarder relative to the LCD panel in a fixed position so that a polarization-changing effect of the residual retardance of the LCD panel on the incident beam is at least partially compensated by a polarization-changing effect of the trim retarder; and, c) adjusting at least one of a voltage to the LCD panel, a temperature of the LCD panel and a temperature of the trim retarder, so as to lessen a combined polarization changing effect of the LCD panel and the trim retarder on the pre-determined polarization state of the incident light beam, to attain a dark-state operation condition of the LCD panel.