LED Module CCT Control via Segmented Thermal Arrangement
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Solution Overview
Problem
Existing lighting systems using light-emitting diodes (LEDs) face challenges in achieving uniform color output and heat dissipation, leading to variations in correlated color temperature (CCT) and color rendering index (CRI), which affect brightness and color consistency.
Innovation Solution
A lighting apparatus with a light-emitting module comprising a circuit board and LED parts emitting red, green, and blue light, where the current strength of each LED is controlled using a control unit and driver to compensate for CCT variations, with heat dissipation enhanced by arranging LEDs based on heat generation characteristics and using a reflection member for improved light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light emitting devices emitting different colors are arranged on a circuit board, then color rendering is improved, but heat dissipation becomes difficult and color uniformity deteriorates
Solution Approach 1:
The light emitting devices are divided into multiple groups based on their heat generation characteristics. High heat generation devices (red LEDs) are segmented into a first group, medium heat generation devices (green LEDs) into a second group, and low heat generation devices (blue LEDs) into a third group. This segmentation allows for optimized spatial arrangement to improve heat dissipation while maintaining color rendering.
Solution Approach 2:
Different arrangement strategies are applied to different groups of light emitting devices based on their local heat generation characteristics. The first group (red LEDs) is arranged with larger spacing or at positions with better heat dissipation pathways, while the second and third groups are arranged with different spacing to balance color uniformity and heat management. This local quality approach resolves the contradiction between color rendering and heat dissipation.
2Temperature
If light emitting devices are arranged to improve heat dissipation, then temperature control is improved, but color uniformity and CCT consistency deteriorate
Solution Approach 1:
The arrangement pattern varies by group: the first group (red LEDs) uses larger spacing for heat dissipation, while the second and third groups (green and blue LEDs) use different spacing to ensure their colors remain uniform. This localized arrangement strategy allows each group to optimize for its specific heat generation level while collectively maintaining overall color uniformity and CCT consistency.
Solution Approach 2:
The invention changes the arrangement parameters (spacing, position) of different light emitting device groups based on their heat generation characteristics. By adjusting these parameters locally for each group, the system achieves both improved heat dissipation and maintained color uniformity, resolving the contradiction between temperature control and color consistency.
3Illumination intensity
If current strength is increased to improve brightness, then illumination intensity is improved, but CCT deviation and color consistency deteriorate
Solution Approach 1:
Different current strength control strategies are applied to different groups of light emitting devices. The first group (red LEDs) is controlled with a first current strength value, while the second and third groups (green and blue LEDs) are controlled with different current strength values. This local quality control approach allows each group to operate at optimal current levels that maintain both brightness and CCT consistency, preventing the CCT deviation that would result from uniform current increase.
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 solution improves color uniformity, reduces CCT deviations, enhances heat dissipation efficiency, and maintains high CRI, resulting in reliable and consistent white light output across various lighting applications.
Implementation Method 1
light emitting devices emitting red, green and blue light
Implementation Method 2
using a reflection member for improved light reflection
Data Source
AI summary
A lighting apparatus disclosed in an embodiment comprises: a circuit board; a light-emitting module arranged on the circuit board and comprising a light source part having first to third light source parts emitting red, green and blue light; a control unit for providing current control signals to the first to third light source parts; a driver for controlling the current in the first to third light source parts by means of the control unit; and a memory unit having compensation data storing input current strength values for the first to third light source parts so that same emit white light having a previously configured correlated color temperature (CCT). The first, second and third light source parts comprise a plurality of first, second and third light-emitting elements for emitting red, green and blue light. The control unit controls the current in the first to third light source parts by means of the input current strength value corresponding to the compensation data so as to control the white light discharged from the light-emitting module is emitted as white light meeting the CCT criterion.