Jds Uniphase Corporation

Apurba Pradhan

Andrew Thomas Taylor

Karen Denise Hendrix

Kim Leong Tan

The invention relates to a method of electronic contrast enhancement for an LCD panel for use in an imaging device. The method comprises the step of coupling the LCD panel with a trim retarder in a pre-determined azimuthal orientation for at least partially compensating the residual in-plane retardance, followed by the step of non-mechanical fine-tuning of a dark state of the LCD panel. In the preferred embodiment, the fine-tuning of the dark state of the LCD panel is realized by adjusting the dark-state magnitude of the LC voltage. The method can be used in batch, e.g. wafer-level manufacturing of integrated trim retarder/LCD panels assemblies that can be electronically tuned to provide high on/off contrast.

Electronically compensated LCD assembly

A fold mirror for a projection display system is designed to lessen a perceived variation in white color balance of light reflected across the mirror wherein the white light is comprised of sub-beams of orthogonal polarization states. The mirror comprises a metal reflective layer and a plurality of optically transparent layers, wherein thicknesses and materials of the optically transparent layers are such that wavelength-averaged reflectance for p-polarized incident green light varies by less than 1%, wavelength-averaged reflectance for s-polarized blue light varies by less than 1.5%, and wavelength-averaged reflectance for s-polarized red light varies by about 4% over a range of angles of incidence between 0 and 65 degrees.

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San Francisco, CA, United States of America

Apurba Pradhan