Light-emitting Apparatus with Segmented LED Sets for Chromaticity Control
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Solution Overview
Problem
COB light-emitting apparatuses face challenges in independently adjusting chromaticity due to variations in sealing resin thickness and temperature-induced chromaticity shifts, making it difficult to correct chromaticity variations during operation.
Innovation Solution
A light-emitting apparatus with multiple sets of blue LEDs mounted on a board, each set connected in series and sealed with a phosphor-containing resin of varying thickness, allowing for selective drive current supply through connection electrodes, enabling chromaticity adjustment within specific ranges by varying the intensity of blue light emitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light-emitting elements are sealed with phosphor-containing resin to enable wavelength conversion, then white light emission is achieved, but chromaticity variation occurs due to thickness differences and temperature rise
Solution Approach 1:
The patent divides the light-emitting elements into multiple independently controllable sets (first set, second set, third set), each capable of being driven separately. This segmentation allows independent adjustment of each set's contribution to the overall chromaticity, enabling correction of chromaticity variations caused by thickness differences and temperature effects in the sealing resin.
Solution Approach 2:
The patent changes the operational parameters by selectively driving different sets of light-emitting elements and adjusting their drive currents. By varying which sets are active and at what intensity levels, the overall chromaticity of the emitted light can be adjusted to compensate for variations caused by resin thickness and temperature, maintaining chromaticity within specified ranges.
2Manufacturing precision
If chromaticity adjustment is made for each product, then chromaticity variation can be corrected, but manufacturing complexity increases
Solution Approach 1:
The light-emitting elements are segmented into multiple sets with independent control, allowing chromaticity adjustment through selective driving rather than physical modification of each product. This reduces manufacturing complexity while achieving chromaticity correction.
Solution Approach 2:
The patent implements dynamic chromaticity adjustment by selectively activating different sets of light-emitting elements based on required chromaticity levels. This dynamic control approach replaces static physical adjustment methods, simplifying manufacturing while maintaining chromaticity precision.
3Adaptability or versatility
If multiple sets of light-emitting elements are used with varying sealing resin thickness, then multi-level chromaticity adjustment is enabled, but device structure becomes more complex
Solution Approach 1:
The patent segments the light-emitting elements into multiple sets positioned at different locations with varying sealing resin thicknesses. Each set contributes differently to the overall chromaticity, enabling multi-level adjustment. The segmentation is achieved through simple spatial arrangement rather than complex structural modifications.
Solution Approach 2:
The patent utilizes parameter changes in the sealing resin thickness at different locations to create distinct chromaticity contributions from each set. By controlling which sets are driven and at what intensity, versatile chromaticity adjustment is achieved without requiring complex device structures.
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 allows for multi-level chromaticity adjustment of emitted light, maintaining chromaticity within ±2% of a Correlated Color Temperature range, effectively addressing temperature-induced shifts and simplifying manufacturing by enabling chromaticity correction.
Implementation Method 1
a sealing resin which includes a phosphor mixed therein and excited by light from the plurality of sets of light-emitting elements
Implementation Method 2
a sealing resin which includes a phosphor mixed therein and excited by light from the plurality of sets of light-emitting elements
Data Source
AI summary
Provided is a light-emitting apparatus including a board, a resin frame fixed on the board, sets of light-emitting elements mounted in a region on the board surrounded by the resin frame, wherein the light-emitting elements configuring each set are connected in series to each other. The light-emitting apparatus further includes connection electrodes provided on the board and electrically connected to the light-emitting elements and capable of supplying a drive current selectively to the sets of light-emitting elements, and a sealing resin which includes a phosphor mixed therein and excited by light from the light-emitting elements, and is filled so as to bury the region on the board, to seal integrally the light-emitting elements. The thickness of the sealing resin immediately above the light-emitting elements differs for the respective sets, and thereby, a chromaticity of light emitted from the sealing resin differs when each set of light-emitting elements emits the light singly.