LED Light Source Color-Balance Correction Under Temperature Shift
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Solution Overview
Problem
Existing light source devices struggle to maintain consistent color balance and light quantity due to temperature-induced wavelength shifts in LEDs, leading to variations in illumination quality.
Innovation Solution
A light source device equipped with multiple LEDs, temperature sensors, light quantity sensors, and a processor that utilizes correlation information to calculate and correct light-quantity variations based on temperature changes, ensuring consistent color balance and light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LED light beams are mixed to generate illumination light of desired color, then color variety is improved, but color consistency deteriorates due to temperature-induced wavelength shifts
Solution Approach 1:
The patent implements a feedback mechanism where temperature sensors continuously monitor LED temperatures, and light quantity sensors detect actual light output. The processor uses this feedback information to calculate correction amounts and adjust LED drive currents, thereby maintaining consistent color balance despite temperature variations and wavelength shifts
Solution Approach 2:
The patent changes the drive current parameters of individual LEDs based on detected temperature variations. By dynamically adjusting electrical parameters (current) in response to temperature changes, the system compensates for wavelength shifts and maintains consistent illumination color across different operating conditions
2Stability of the object's composition
If LED output is controlled based on temperature to maintain constant color, then color stability is improved, but device complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
The system performs self-diagnosis and self-correction by using onboard temperature sensors to detect LED temperature changes and light quantity sensors to measure actual output. The processor automatically calculates correction amounts and adjusts drive currents without external intervention, enabling the system to self-regulate and maintain color stability
Solution Approach 2:
The processor serves multiple functions: it controls LED drive currents, processes temperature sensor data, processes light quantity sensor data, calculates correction amounts, and executes color balance adjustments. This multi-functionality consolidates control logic into a single component, managing complexity through functional integration
3Stability of the object's composition
If correlation information is stored and processed to calculate light-quantity correction amounts, then illumination stability is improved, but information processing requirements increase
Solution Approach 1:
The patent stores correlation information (temperature-light quantity relationships) in advance in memory before operation. During actual operation, the processor simply retrieves this pre-stored correlation data and applies it to current temperature readings to determine correction amounts, avoiding the need for complex real-time calculations and reducing processing load
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 device maintains consistent color balance and light quantity by predicting and correcting for spectral and light quantity changes caused by temperature fluctuations, enhancing illumination stability.
Implementation Method 1
the wavelength of light emitted from an LED changes due to a temperature change in the LED
Implementation Method 2
at least one optical filter that has specific spectral transmission properties and through which at least one of the light beams output from at least one light source
Implementation Method 3
at least one light quantity sensor that detects a current light quantity of the at least one light beam before traveling through the optical filter
Data Source
AI summary
A light source device includes light sources, a light output unit, optical filters, temperature sensors detecting current temperatures of the sources, light quantity sensors detecting current light quantities of light beams before traveling through the filters, a storage, and a processor. The storage stores first correlation information between the temperatures of the sources and spectral information and second correlation information between the spectral information and light quantity of light at the unit. The processor is configured to calculate a variation in the spectral information based on each current temperature and the first information, calculate a variation in the light quantity of the light at the unit caused by a change in the spectral information based on the variation in the spectral information and the second information, and calculate a light-quantity correction amount for each of the sources based on the variation in the light quantity and the current light quantity.