40.1: Invited Paper: Scrolling Color LCOS for HDTV Rear Projection

Abstract

We report on advancements for a single-panel Liquid Crystal On Silicon (LCOS) display based on the Philips scrolling-color architecture. Performance and cost advantages make this system ideal for High Definition Television (HDTV). We discuss aspects of a 64" rear projection display showing a 1280x720 image. Red Green Blue Active Address Lines : Red Green Blue Colored Stripes Scroll Top to Bottom LCD Figure 1: Schematic of the illumination pattern and active address lines at the LCD panel.

Liquid Crystal Projection System Basics

“…Examples of optical conversion systems include the polarization conversion systems (PCSs) described above and scrolling color illumination systems using either spiral color wheels [Dewald D. S., 2001] or prisms [Shimizu J. A., 2001].…”

High-efficiency free-form nonimaging condenser overcoming rotational symmetry limitations

“…Other approaches to improve system efficiency include color recapture [14] and color scrolling [15] (which try to recover the losses produced by the color filtering in single microdisplay projectors), or polarization-recovery techniques [16] (which try to recover the 50% losses produced by the need of polarized light in LCD and LCoS systems). In these approaches, however, the resulting lamp etendue is accordingly increased (doubled and tripled in polarization and color recovery systems, respectively), further limiting the performance of small microdisplays that use classical condensers.…”

A single-panel LCoS engine based on light guides

“…Philips has developed a single-panel liquid-crystal-on-silicon (LCoS) projection display as its solution to large-area high-definition television. 1,2 There are many advantages to a single-panel approach, especially in the areas of system cost and improved picture quality. The landscape for consumer projection television has become increasingly competitive as the microdisplay segment starts to mature.…”