Temperature-Compensated Optoelectronic Module for Stable Color Locus
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Solution Overview
Problem
Existing optoelectronic modules struggle to accurately reproduce electromagnetic radiation with a desired color locus and brightness due to temperature-dependent variations in brightness and chromaticity, particularly affecting red emitters more significantly than blue or green emitters.
Innovation Solution
An optoelectronic module with semiconductor diodes emitting in different wavelength ranges, controlled by a control element with temperature sensors and non-linear characteristic curves, allows independent control of emitters to compensate for temperature effects, ensuring consistent color and brightness across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If semiconductor emitter units are used to generate electromagnetic radiation, then the module can emit light in different wavelength ranges with long service life and low cost, but the brightness and chromaticity coordinates vary with temperature, affecting color accuracy
Solution Approach 1:
The patent applies preliminary action by measuring and storing the characteristic curves of each semiconductor emitter unit at different temperatures during the manufacturing process. These curves are saved in a memory unit before the product is deployed, enabling the control element to later retrieve and apply the appropriate calibration data based on measured temperature, thereby compensating for temperature-induced color variations without requiring complex real-time adjustments during operation.
Solution Approach 2:
The patent implements feedback by using a temperature sensor to continuously monitor the temperature of the semiconductor emitter units and feeding this information back to the control element. The control element then uses this temperature data to select the appropriate characteristic curves from memory and adjusts the drive currents accordingly, creating a closed-loop system that maintains color accuracy despite temperature changes.
2Adaptability or versatility
If the brightness of individual emitters is varied to generate mixed radiation with different color loci, then color versatility is improved, but temperature-dependent variations in each emitter affect the overall color reproduction accuracy
Solution Approach 1:
The patent applies preliminary action by pre-measuring and storing the characteristic curves of each semiconductor emitter unit at different temperatures during the manufacturing process. These curves are saved in a memory unit before the product is deployed, enabling the control element to later retrieve and apply the appropriate calibration data based on measured temperature, thereby compensating for temperature-induced color variations without requiring complex real-time adjustments during operation.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the drive currents to each semiconductor emitter based on temperature-dependent characteristic curves. The control element selects appropriate curves from memory based on measured temperature and modifies the electrical parameters (currents) supplied to each emitter, thereby compensating for temperature-induced shifts in brightness and chromaticity to maintain accurate color reproduction.
3Measurement precision
If component-specific calibration is performed to measure nonlinear characteristic curves for each emitter, then temperature compensation precision is improved, but the device complexity and calibration process time increase
Solution Approach 1:
The patent applies preliminary action by pre-measuring and storing the characteristic curves of each semiconductor emitter unit at different temperatures during the manufacturing process. These curves are saved in a memory unit before the product is deployed, enabling the control element to later retrieve and apply the appropriate calibration data based on measured temperature, thereby compensating for temperature-induced color variations without requiring complex real-time adjustments during operation.
Solution Approach 2:
The patent applies copying by creating digital representations (characteristic curves) of each emitter's behavior at different temperatures and storing these copies in memory. Instead of physically adjusting or modifying the emitters during operation, the system uses these digital copies to calculate and apply the necessary compensation, simplifying the runtime operation while maintaining high precision.
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 module achieves precise control over color locus and brightness by compensating for temperature variations, enabling accurate reproduction of mixed radiation regardless of operating temperature.
Implementation Method 1
The semiconductor emitter unit is formed with a semiconductor material and is provided for emitting electromagnetic radiation in different wavelength ranges. The emitters are designed as semiconductor diodes.
Data Source
AI summary
An optoelectronic module includes a control element, at least one temperature sensor, and at least one semiconductor emitter unit. The semiconductor emitter unit includes at least a first emitter and a second emitter. The first emitter is intended to emit electromagnetic radiation in a first wavelength range. The second emitter is intended to emit electromagnetic radiation in a second wavelength range different from the first wavelength range. The control element includes a memory unit and a driver output for each emitter. The temperature sensor determines a temperature. Each emitter is assigned a non-linear characteristic curve in the memory unit. The control element is intended to drive the emitters independently of each other by means of a respective driver output. The control element controls the emitters depending on the determined temperature and the respective characteristic curve of the emitter.