Laser Projector Current Correction With Single-Sensor Intensity Feedback
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Solution Overview
Problem
Existing laser projectors face challenges in achieving consistent light intensity due to variations in laser device performance and degradation over time, leading to suboptimal projection image quality, and current solutions require multiple optical components, increasing complexity and cost.
Innovation Solution
A driving current correction method and apparatus that uses a single light sensor to detect and correct the light intensity of multiple laser devices by establishing a relation between driving current and actual light intensity, allowing for precise adjustment of driving currents during pixel projection, thereby simplifying the optical path and reducing component complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple beam splitters and light sensors are arranged corresponding to each laser device to detect and correct light intensity, then the light intensity monitoring and correction can be achieved, but the number of optical components increases, the optical path becomes complicated, the laser source size increases, and the manufacturing cost increases
Solution Approach 1:
The patent merges the light detection function from multiple separate sensors into a single light sensor. The beam combiner combines multiple laser beams into one composite beam, which is then detected by a single light sensor. This reduces the number of optical components while maintaining the ability to monitor and correct light intensity across all laser devices.
Solution Approach 2:
The single light sensor serves as a universal detector for all laser devices. Instead of having dedicated sensors for each laser, one sensor monitors the combined output of all lasers, making the detection system multi-functional and applicable to all laser devices simultaneously.
2Measurement precision
If multiple beam splitters and light sensors are arranged corresponding to each laser device to detect and correct light intensity, then the light intensity monitoring and correction can be achieved, but the laser source becomes large and difficult to manufacture
Solution Approach 1:
The patent merges the light detection function from multiple separate sensors into a single light sensor. The beam combiner combines multiple laser beams into one composite beam, which is then detected by a single light sensor. This reduces the number of optical components while maintaining the ability to monitor and correct light intensity across all laser devices.
3Measurement precision
If multiple light sensors are used to detect light intensity from each laser device, then the light intensity can be monitored, but the consistency of monitoring cannot be ensured
Solution Approach 1:
The patent merges the light detection function from multiple separate sensors into a single light sensor. The beam combiner combines multiple laser beams into one composite beam, which is then detected by a single light sensor. This reduces the number of optical components while maintaining the ability to monitor and correct light intensity across all laser devices.
Solution Approach 2:
The single light sensor serves as a universal detector for all laser devices. Instead of having dedicated sensors for each laser, one sensor monitors the combined output of all lasers, making the detection system multi-functional and applicable to all laser devices simultaneously.
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 ensures high consistency in detected light intensity information, reduces the number of optical devices, and lowers manufacturing costs while maintaining high accuracy in correcting driving currents for multiple laser devices, resulting in improved projection image quality.
Implementation Method 1
a light sensor arranged corresponding to the each laser device detects the actual light intensity of the laser emitted from the laser device
Data Source
AI summary
The present invention discloses a driving current correction method and apparatus for multiple laser devices, and a laser projector. A specific embodiment of the method includes in a projection period of a n-th pixel point: sequentially driving a plurality of laser devices of a laser source to emit laser, and respectively detecting light intensity information of lasers emitted from the plurality of laser devices by using a light sensor; acquiring an actual light intensity of the lasers emitted from the plurality of laser devices according to an electric signal output by the light sensor, and establishing a corresponding relation between a driving current and an actual light intensity of each laser device according to the driving current of the each laser device and the actual light intensity of the laser emitted from the each laser device when the n-th pixel point is projected; from a projection of a (n+1)-th pixel point: correcting the driving current of the each laser device according to a set light intensity of the each laser device and the corresponding relation between the driving current and the actual light intensity of the each laser device. The implementation has a high consistency of detecting light intensity information that can be simply performed.