Computer graphics processing and selective visual display system – Display driving control circuitry – Light detection means
Patent
1996-03-14
1999-02-02
Lao, Lun-Yi
Computer graphics processing and selective visual display system
Display driving control circuitry
Light detection means
345 6, 345 10, 348190, G09G 100, H04N 1702
Patent
active
058671528
ABSTRACT:
A 3D display having a closed loop feedback system dynamically adjusting the scanning pattern of laser beams on-line to maintain pointing errors of all scanned images to a specified tolerance. A predetermined alignment pattern, preferably a matrix of dots with known coordinates, is periodically injected into the image data path, preferably during non-display periods. A grid is disposed on each of two mirrors which enter into two separate light paths and are scanned. The mirrors reflect the laser beams from the grid to an optical sensor for each beam, each sensor connected to an A/D converter and producing an output proportional to the intensity of the reflected light. The sensor output is an analog function of the light intensity impinging thereon. The digitized values are stored in a grid buffer which accumulates an entire intensity pattern of grid points. The the intensity data is collected for offset and gain beams separately and the x and y centroid is computed for the gain and offset grid and used to compute adjustment values for the offset, gain and power intensity of the normal data values sent to the optics. A reference intensity sets the nominal value to which the loop corrects. The adjustment values are applied to the display data before being sent to the optics and are applied to the predetermined alignment pattern, allowing the loop to close to a specified accuracy, depending upon loop bandwidth and time constant. A linearity lookup value is applied to the display data to compensate for any fixed nonlinearity in the data path due to optics or fabrication errors.
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Lao Lun-Yi
Raytheon TI Systems Inc.
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