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Video processing IC enables thin RPTVs

Posted: 17 Jan 2007 ?? ?Print Version ?Bookmark and Share

Keywords:processor? RPTV? LCD? Silicon Optix? display?

Silicon Optix has announced a video/graphics-geometry processing chip that makes possible a new class of low-cost, high-performance rear-projection TVs that are thin enough to hang on a wall, while also eliminating hot spots and color non-uniformity in LCD and projection displays.

Geo is said to be the first chip to allow for pixel-by-pixel brightness control, thereby ensuring brightness uniformity for large-area LCD panel displaysespecially those driven by LEDs, which can vary significantly in brightness. The chip can also correct a problem popularly called the "green glob" (pastel-discolored regions), commonly seen in three-panel projection systems.

Electronic correction
With Geo, optical problems such as lateral chromatic aberrations, optical distortion and three-panel misconvergence can be corrected electronically, eliminating the need for more expensive optical and mechanical solutions. The company said Geo's array of adjustments will, for the first time, free designers to create inexpensive RPTVs with cabinet depths that rival those of today's popular flat-panel LCD and plasma displayswith much less weight and power consumption. Video wall systems with multiple display elements, each of which may have a different brightness, can now be balanced for a more seamless appearance.

A complete SoC, Geo incorporates three high-precision geometry-correction engines, one for each color channel (red, green, blue). Each channel has independent adjustments to compensate for pincushion/barrel distortion, keystone distortion and rotational misalignment.

Fewer lens elements
By correcting common picture problems digitally instead of optically, Geo improves performance and reduces costs. Optical assemblies can now be designed using less expensive glass, simpler lens construction and fewer lens elements. In addition, optical designers can concentrate on optimizing parameters such as MTF and lens-element count instead of distortion and lateral color shift, as the latter can be corrected digitallyresulting in both lower cost and better image quality.

The Geo chip has begun sampling and will be available in volume in late Q1 2007.

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