Laser Projector Brightness Compensation via Pixel Position Lookup
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Solution Overview
Problem
Laser projectors using scanners face issues with non-uniform image brightness due to varying scanner motion speed, leading to power inefficiencies and user dissatisfaction.
Innovation Solution
A laser projector system that includes a drive signal generation unit, pixel position detection, a compensation value decision unit, and a compensation unit to adjust the laser drive signal based on detected pixel positions, ensuring brightness is uniformly compensated across the image by gradually increasing or decreasing brightness values from a reference pixel to other pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the scanner operates at high speed to improve productivity, then the scanning efficiency increases, but the image brightness becomes non-uniform due to varying motion speed
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing brightness compensation values for each pixel position in a lookup table before the actual scanning process. The compensation values are determined based on the expected scanner motion speed variations, allowing the system to quickly retrieve and apply the appropriate compensation without real-time calculation delays, thus maintaining both high scanning speed and uniform image brightness.
Solution Approach 2:
The patent changes the laser drive signal parameters dynamically based on pixel position and expected scanner speed. By adjusting the laser intensity parameter according to pre-calculated compensation values, the system compensates for brightness non-uniformity caused by varying scanner motion speed, ensuring uniform image brightness while maintaining high scanning efficiency.
2Illumination intensity
If the laser drive signal is increased to compensate for brightness non-uniformity, then the image brightness uniformity improves, but the power consumption increases
Solution Approach 1:
The patent applies local quality by providing different brightness compensation levels to different pixel positions rather than uniformly increasing the entire laser drive signal. The compensation is localized to specific regions where brightness non-uniformity occurs, allowing the system to maintain image brightness uniformity while minimizing overall power consumption by only adjusting laser intensity where necessary.
Solution Approach 2:
The patent uses partial action by applying brightness compensation only to the extent necessary to achieve uniformity, rather than excessively increasing the overall laser power. The pre-calculated compensation values are optimized to provide just enough adjustment to correct brightness non-uniformity, avoiding unnecessary energy consumption while maintaining image quality.
3Illumination intensity
If real-time brightness compensation is implemented to improve image quality, then the brightness uniformity improves, but the device complexity increases
Solution Approach 1:
The patent reduces device complexity by performing brightness compensation calculations in advance and storing the results in a lookup table. This preliminary action eliminates the need for complex real-time calculation hardware during scanning, as the system only needs to retrieve pre-computed compensation values based on pixel position and expected scanner speed, significantly simplifying the real-time processing requirements.
Solution Approach 2:
The patent replaces complex real-time mechanical or computational adjustment mechanisms with a software-based lookup table approach. Instead of using complex hardware to dynamically calculate and adjust brightness during scanning, the system uses pre-computed data stored in memory, substituting mechanical/computational complexity with simpler data retrieval and application operations.
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 system achieves uniform image brightness and reduces power consumption by dynamically adjusting the laser drive signal based on scanner motion speed, enhancing user satisfaction and projector efficiency.
Implementation Method 1
a laser light source for generating laser light according to the compensated laser drive signal
Implementation Method 2
a scanner for scanning the laser light according to the scanner drive signal
Data Source
AI summary
A laser projector includes a drive signal generation unit for processing an input image signal to generate a laser drive signal and a scanner drive signal, a pixel position detection unit for detecting positions of pixels corresponding to a one-frame image from the generated scanner drive signal, a compensation value decision unit for deciding a brightness compensation value corresponding to the detected pixels, a compensation unit for compensating a laser drive signal corresponding to the detected pixels according to the decided brightness compensation value, a laser light source for generating laser light according to the compensated laser drive signal, and a scanner for scanning the laser light according to the scanner drive signal.