Solid-State Lighting Closed-Loop Color Control With One Sensor
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Solution Overview
Problem
Conventional lighting systems using LEDs face challenges in maintaining color fidelity due to heat-induced color shifts and LED deterioration, which are compounded by the use of temperature sensors and RGB sensors that increase manufacturing costs and complexity.
Innovation Solution
A single color sensor is used to measure the intensity of mixed light from a multi-color SSL device, allowing for closed-loop control without onboard temperature or RGB sensors, thereby adjusting drive currents to maintain desired color coordinates and reduce space occupancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If temperature sensors and RGB sensors are used to control color coordinates, then color fidelity is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent combines the functions of temperature sensing and color measurement into a single color sensor that simultaneously provides both temperature information and color coordinate data, eliminating the need for separate temperature sensors and RGB sensors
Solution Approach 2:
The color sensor is designed to perform multiple functions: measuring color coordinates of LED emissions and detecting junction temperature through thermal coupling, making it a universal sensor that replaces multiple specialized sensors
2Manufacturing precision
If auxiliary red LEDs are used to adjust color rendering, then color fidelity is improved, but device complexity and space occupancy increase
Solution Approach 1:
The system uses feedback from the color sensor to dynamically adjust the drive currents to RGB LEDs, replacing the need for fixed auxiliary red LEDs with a controllable feedback mechanism that achieves color rendering through software control
Solution Approach 2:
The patent changes the operational parameters (drive currents) of existing RGB LEDs dynamically based on sensor feedback, rather than adding fixed auxiliary LEDs, allowing flexible adjustment of color output through electrical parameter control
3Manufacturing precision
If multiple sensors and auxiliary LEDs are used, then color coordinate control is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges multiple components (temperature sensor, RGB sensor, auxiliary LEDs) into a single color sensor, reducing component count and assembly complexity, which directly lowers manufacturing costs
4Stability of the object's composition
If onboard temperature sensors and RGB sensors are used, then color stability is improved, but energy consumption increases
Solution Approach 1:
The patent combines temperature sensing and color measurement functions into a single sensor, reducing the total power consumption associated with operating multiple separate sensors while maintaining color stability through integrated monitoring
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 enhances performance and reduces manufacturing costs by maintaining consistent color fidelity over time, while minimizing space usage and energy consumption.
Implementation Method 1
A single color sensor is used to measure the intensity of mixed light from a multi-color SSL device
Implementation Method 2
controlling the characteristics of the mixed light emitted from the multi-color SSL device by adjusting drive currents to the LEDs
Data Source
AI summary
A lighting system includes a solid state lighting device capable of generating mixed light and a controller. The solid state lighting device includes light sources for producing mixed light and a sensor configured to detect light from one of the light sources. The controller controls two or more of the light sources based on output from the sensor. The controller can communicate with the sensor to provide closed-loop control.