Laser Illumination Timing Adjustment for Uniform Projection
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Solution Overview
Problem
Luminance non-uniformity occurs in images projected on screens due to varying scanning speeds of laser beams, causing discomfort for viewers as spot beams become closer near the edges, leading to inconsistent illumination.
Innovation Solution
A control apparatus and method that adjusts the timing of laser beam illumination based on scanning position, using a generation unit to create adjustment information for adjusting the clock, ensuring consistent optical power and illumination time across the screen, thereby maintaining even pixel intervals and preventing luminance non-uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the laser beam scans the screen at resonance frequency of the driving mirror, then the scanning speed becomes the fastest, but the scanning speed becomes slower toward the edge of the screen causing luminance non-uniformity
Solution Approach 1:
The patent applies dynamics by making the illumination timing variable according to scanning position. The system transitions from a fixed periodic illumination approach to a dynamic timing adjustment where the illumination timing changes based on the instantaneous scanning speed at different screen positions, thereby maintaining uniform luminance despite varying scanning speeds
Solution Approach 2:
The patent changes the timing parameter of laser beam illumination based on scanning position. By adjusting the illumination timing to compensate for the varying scanning speed (faster at center, slower at edges), the system maintains consistent luminance across the screen while operating at resonance frequency for maximum scanning speed
2Device complexity
If the laser beam illuminates the screen in synchronization with predetermined intervals, then the illumination timing is simplified, but the spot beams become closer to each other near the edge causing luminance non-uniformity
Solution Approach 1:
The patent modifies the illumination timing parameter from a fixed predetermined interval to a position-dependent variable timing. The illumination timing is adjusted according to the scanning position to maintain consistent pixel spacing and luminance uniformity across the screen
Solution Approach 2:
The system uses feedback from the scanning position information to adjust the illumination timing. By monitoring where the laser beam is on the screen and adjusting the illumination timing accordingly, the system compensates for speed variations and maintains uniform luminance distribution
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents luminance non-uniformity by ensuring consistent optical power and illumination time across the screen, improving image quality and reducing power consumption while conforming to EMI standards without the need for additional shielding.
Implementation Method 1
a driving mirror which reflects a laser beam is driven, and each position on the screen is illuminated by the laser beam reflected from the driving mirror
Implementation Method 2
as the laser beams are made to scan at a scanning speed corresponding to the resonance frequency of the driving mirror
Data Source
AI summary
A generation unit generates adjustment information to adjust a first clock indicating a timing of illumination of a laser beam to scan on a screen, based on a scanning position to be scanned by the laser beam.On the basis of the adjustment information, adjustment unit adjusts the first clock to a second clock different from the first clock. Then, in synchronization with the second clock, the laser beam is allowed to illuminate as a pixel. This may be applicable to a projection apparatus for projecting an image on the screen, for example.