Laser Projection Device Edge Spot Beam Interference Control
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Solution Overview
Problem
Projection devices that scan a screen with reciprocating laser beams suffer from interference between spot beams near the edge of the screen, leading to deteriorated image quality due to varying scanning speed and spot beam density.
Innovation Solution
A projection device that generates and controls pixel data to project spot beams without overlapping or with adjusted brightness, using a pixel engine that interpolates pixel values based on reference pixels and filter coefficients selected by spot position and screen distance, to prevent interference and maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If laser beams are radiated at predetermined intervals with reciprocating scanning, then the projection device can cover the entire screen area, but the distance between spot beams decreases and widths increase toward the edge, causing interference
Solution Approach 1:
The patent applies local quality by differentiating the treatment of spot beams based on their position on the screen. Center region spot beams are projected with standard intensity and timing, while edge region spot beams have their projection timing adjusted to occur after the center beams have passed. This positional differentiation prevents interference at edges while maintaining efficient center region projection, thereby resolving the contradiction between comprehensive screen coverage and precise spot beam positioning.
2Speed
If scanning speed is fastest in the center and decreases toward the edge due to resonant frequency, then the projection device operates efficiently, but spot beam density becomes non-uniform with increased width at edges
Solution Approach 1:
The patent implements dynamics by making the projection timing of spot beams adaptive rather than fixed. The projection timing is dynamically adjusted based on the spatial position of each spot beam: center region beams use standard timing while edge region beams use delayed timing. This dynamic adjustment compensates for the non-uniform scanning speed caused by resonant frequency, maintaining uniform spot beam density across the entire screen while preserving the efficiency benefits of resonant scanning.
3Device complexity
If spot beams are projected at predetermined intervals, then the projection device operates with simple timing control, but interference occurs between spot beams toward the edge of the screen
Solution Approach 1:
The patent applies local quality by implementing position-dependent projection timing. Spot beams are categorized into center region and edge region, with each category receiving different timing treatment. Center region spot beams are projected at standard intervals, while edge region spot beams are projected with adjusted timing to occur after corresponding center beams have passed. This localized timing adjustment eliminates interference at edges without requiring complete redesign of the timing system, thus resolving the contradiction between control simplicity and interference prevention.
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 suppresses interference between spot beams, enhancing the image quality projected onto the screen by ensuring consistent pixel density and brightness across the projection area.
Implementation Method 1
a driving mirror that reflects laser beams is driven, and laser beams reflected from the mirror are radiated to respective positions on a screen
Implementation Method 2
since scanning with laser beams is performed at a scanning speed corresponding to the resonant frequency of the driving mirror
Data Source
AI summary
There is provided a projection device including a projecting unit that projects an image onto a screen, an acquiring unit that acquires image data of the image to be projected onto the screen, a generating unit that generates first pixel data representing pixels of first spot beams to be projected onto the screen without overlapping with each other among a plurality of spot beams to be projected at different timings based on the image data, and a driving control unit that controls driving of the projecting unit based on the first pixel data in a manner that the first spot beams are projected onto the screen as pixels of the image data.