Laser Projector Variable Beam Scanning Resolution
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Solution Overview
Problem
Laser projectors experience reduced resolution at the ends of the screen due to non-uniform beam spacing, leading to lower vertical resolution and reduced display period, which is mitigated by centering the display to minimize these issues but results in a smaller scanned screen size and reduced luminescence duty.
Innovation Solution
The laser projector employs a scanning method where the high-speed axis operation is alternated in direction between frames, and the low-speed axis operation is extended to 2n+1 or n+½ times the high-speed period, dividing the screen into multiple fields or sub-fields with differing beam loci, and using optical elements to adjust beam size and shape, ensuring the beam size at the periphery is 1.5 times larger than at the center.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the laser projector uses conventional scanning method with uniform beam spacing in center, then the resolution in center is maintained, but the resolution at ends of screen is reduced and display period is shortened
Solution Approach 1:
The patent applies local quality by making the beam size variable across the screen - smaller in the center region and larger at the peripheral ends. This allows the center to maintain high resolution with tight beam spacing while the periphery uses larger beams to compensate for the reduced resolution caused by scanning turns, thereby maintaining acceptable resolution across the entire screen while maximizing the display period.
Solution Approach 2:
The patent implements dynamics by dynamically adjusting the beam size based on the scanning position. The beam diameter is modulated during scanning - reduced when scanning through the center region and increased when scanning through the peripheral regions. This dynamic adaptation allows the system to optimize resolution locally while maintaining a longer overall display period.
2Measurement precision
If the display utilizes center part of screen to avoid beam turning effects, then resolution is maintained, but the scanned screen size is reduced and luminescence duty is reduced
Solution Approach 1:
The patent makes the beam size adaptive to the scanning position, creating local quality variations. In the center region where resolution is critical, the beam size is kept small. At the peripheral ends where beam turning causes resolution degradation, the beam size is increased to compensate. This allows the entire screen area to be utilized effectively rather than just the center portion.
Solution Approach 2:
The patent converts the harmful effect of beam turning at screen edges into a beneficial feature by intentionally enlarging the beam size in those regions. The beam turning that would normally cause resolution loss is compensated by the larger beam diameter, transforming what was a disadvantage into an acceptable or even advantageous characteristic that allows full-screen utilization.
3Ease of manufacture
If the beam size is uniform across the screen, then manufacturing is simplified, but resolution at peripheral ends is reduced due to beam turning
Solution Approach 1:
The patent transitions from a static, uniform beam size to a dynamic, variable beam size that changes during the scanning process. The beam diameter is modulated based on the instantaneous scanning position, being smaller in the center and larger at the periphery. This dynamic control resolves the resolution issue at screen ends while adding manageable complexity to the beam control system.
Solution Approach 2:
The patent changes the beam size parameter during operation based on scanning position. By modulating the beam diameter as a variable parameter rather than keeping it constant, the system compensates for the resolution loss at peripheral regions caused by beam turning, while maintaining relatively simple manufacturing through controlled parameter variation.
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
This approach maintains resolution at the screen ends, expands the displayable period, and improves image brightness by enlarging the screen size and enhancing luminescence duty.
Implementation Method 1
The laser projector makes scanning two-dimensionally with light beam by means of a deflection element such as MEMS mirror to thereby project a display image on the projection screen
Implementation Method 2
The axis for movement at high speed can be realized at low power with wide amplitude by resonating a mirror
Data Source
AI summary
A laser projector includes a laser light source to emit laser light modulated in accordance with image information, a scanner to drive the laser light along two axes in horizontal and vertical directions and make scanning two-dimensionally with the laser light, a scanning mirror drive part to produce a drive signal of the scanner, a light source data conversion part to change arrangement in a horizontal direction of data applied to the laser light source and a timing generation part to synchronize the scanning mirror drive part with the light source data conversion part, and a start direction of laser scanning in the horizontal direction is changed every frame of the image information.