Patent ID: 6666896
Filing Date: 2003-12-23
Classification: H04N

Abstract:
A projection display comprising:at least one image signal source for providing image signals to be displayed on the projection display; at least one controller for converting the image signals from the image signal source into signal formats for displaying and providing image drive signals; at least one image connected to the controller for forming display images from the image drive signals; a first lamp providing light; a linear polarizer for polarizing the light from the first lamp into s-polarized light; a second lamp providing light; a first polarizing beam splitter for receiving the light from the second lamp and splitting the light from the second lamp into s-polarized light and p-polarized light and for receiving the s-polarized light from the linear polarizer and combining the s-polarized light from the linear polarizer with the split p-polarized light; a second polarizing beam splitter for receiving the combined s- and p-polarized light from the first polarizing beam splitter and splitting the combined s- and p-polarized light into s-polarized light and p-polarized light; a first mirror for reflecting the s-polarized light from the second polarizing beam splitter; a first half-wave retarder for receiving the s-polarized light reflected from the first mirror and shifting the s-polarized light to p-polarized light; a first converging lens for combining the p-polarized light from the second polarizing beam splitter and the p-polarized light from the first half-wave retarder; a first light pipe for channeling the combined light from the converging lens to a first image engine to form the display image; projection optics for channeling the display image from the first image engine; a screen for displaying the image; and further comprising a lamp power controller for detecting a failure of a lamp and adjusting power to an operating lamp to maintain illumination of the screen.