Wavelength Estimation for Semiconductor Laser HUDs
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Solution Overview
Problem
Existing wavelength measurement methods for light sources in HUDs are complex and inefficient, making accurate wavelength estimation and light emission control challenging, especially in dynamic environments with varying temperatures and light conditions.
Innovation Solution
A simplified method using temperature dependence and light reception data to estimate the wavelength of light emitted from semiconductor lasers, allowing for accurate adjustment of light emission amounts to maintain desired color and image quality, without the need for complex superheterodyne methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a typical wavelength measurement method (superheterodyne using optical band-pass filter) is introduced, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the essential measurement function from the complex superheterodyne system. Instead of using the full superheterodyne apparatus with optical band-pass filters, it isolates the core wavelength-to-intensity relationship and implements a simplified detection mechanism that achieves the same measurement objective with fewer components.
Solution Approach 2:
The patent creates a simplified model or representation of the wavelength measurement process. By using a light-receiving element that directly converts optical wavelength information into electrical signals through intensity variation, it copies the essential measurement function without requiring the complex physical infrastructure of superheterodyne detection.
2Measurement precision
If accurate wavelength measurement is implemented using conventional methods, then measurement precision is improved, but the device size increases
Solution Approach 1:
The patent removes unnecessary voluminous components from the measurement system. By extracting only the essential wavelength-detection function and implementing it through a compact light-receiving element, it achieves accurate wavelength estimation without the bulk of conventional measurement apparatus.
Solution Approach 2:
The patent replaces mechanical/optical measurement mechanisms (such as rotating filters, moving mirrors, or bulky optical paths) with an electronic detection approach. The light-receiving element directly converts optical information into electrical signals, eliminating the need for complex mechanical or optical components that would increase device volume.
3Measurement precision
If complex wavelength measurement systems are used, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent extracts the essential measurement function from complex operational procedures. By focusing on the direct relationship between light wavelength and detected intensity, it eliminates complicated measurement protocols, calibration sequences, and operational steps, making the system easier to operate while maintaining precision.
Solution Approach 2:
The patent enables the measurement system to automatically determine wavelength information without requiring complex user intervention. The light-receiving element self-adjusts and directly outputs wavelength data based on the intensity of received light, making the system easy to operate while maintaining high measurement accuracy.
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 enables accurate and efficient wavelength estimation and light emission control, ensuring high-quality color reproduction in HUDs, even under dynamic conditions, with a simplified configuration that reduces system complexity and size constraints.
Implementation Method 1
a light-receiving element to receive the light
Implementation Method 2
estimating a wavelength of light emitted from the light source based on an amount of light received by the light-receiving element
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A wavelength estimation device (7000) including a light detector (117) to receive light emitted from a light source (110) and an estimation unit (700a). The estimation unit (700a) estimates a wavelength of the light based on an amount of light received by the light detector (117).