Patent ID: 8325282
Filing Date: 2012-12-04
Classification: H04N

Abstract:
1. An projection television with automatic geometric alignment comprising an enclosure, a display screen positioned within the enclosure, a plurality of light sensors positioned in an over-scan region in the enclosure along the border of the screen, a first programmable logic operably coupled to the plurality of light sensors, a second programmable logic operably coupled to the first programmable logic, and an on screen display (OSD) system coupled to the first programmable logic and operably coupled to the screen, wherein the first programmable logic is configured to cause the OSD system to display and incrementally move a test pattern from the edge of an active bitmap inwards until detected by the light sensors and determine geometric alignment error in the displayed test pattern from feed back data received from the light sensors, wherein the test pattern comprises a plurality of dots arranged in a predetermined pattern, and wherein the second programmable logic is configured to align, center or steer light beams projected onto the screen and to utilize geometric alignment error data received from the first programmable logic to compensate for geometric mis-alignment in the light beam projections.