GEO IC
Geometry Processor for Advanced Capture & Projection Light Engines
GEO is a highly integrated SOC (system-on-chip), with no industry precedent, targeted for high-volume 3-channel capture and projection light engine applications. GEO is the first video processor to include brightness non-uniformity compensation. This compensation allows separate gain and offset control for chrominance non-uniformity compensation (sxW2-300), as a standard chip feature.
The chip features independent extended-precision Geometry Correction Engines, one per channel (sxW2-300). The advanced distortion correction and brightness/hue compensation capability of GEO’s Geometry Correction Engines, enables the capture and delivery of superior quality, artifact-free video for the highest fidelity consumer experience in RPTV (Rear-Projection Television), home theater front projectors, and 3-sensor HD video cameras.
The chip processes up to 3-color components with different pincushion/barrel correction, keystone correction, and rotational misalignment correction. This enables the correction of optical problems, such as lateral chromatic aberration, 2- or 3-panel convergence correction (prism-to-microdisplay or prism-to-sensor misalignments and channel-to-channel magnification imbalances).
The chip’s unprecedented features allow new degrees of freedom for system designers seeking to inexpensively implement RPTVs with diagonal-to-depth ratios from 4:1 to over 10:1, using techniques such as curved mirrors, advanced lenses, and circular TIR (Total Internal Reflection) Fresnel lenses.
GEO sxW2-300 allows lens designs to be modified in order to improve performance (better MTF, lower distortion, reduced temperature effects) while reducing costs (less expensive glass, simpler lens construction, reduction of aspherical elements). For zoom lenses, the chip can dynamically correct for distortion and lateral chromatic aberration as the focal length varies. This provides further cost reduction, by allowing designers to use simpler mechanical elements. The system designers can also take advantage of GEO to greatly simplify alignment and calibration of light engines and their prism/panel assemblies.
An embedded 32-bit RISC CPU provides the central control for the chip and computes the geometry factors required to correct for misalignment in the field.
Download GEO Product Brief