LED Light-Emitting Device with Dummy Elements for Uniform Luminance
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Solution Overview
Problem
Existing light-emitting devices using LED elements suffer from uneven light emission and luminance due to the point-source nature of LEDs, requiring multiple LEDs and sealing with light-transmitting resin, which can lead to variations in phosphor deposition and color borders when using particulate phosphors.
Innovation Solution
A light-emitting device design featuring a base with a mounting area, a substrate, light-emitting elements, dummy elements, and a sealing resin body containing phosphor, where the dummy elements fill gaps around the LEDs, ensuring uniform light emission by matching their height and shape with the LEDs, and using a light-transmitting resin binder with particulate phosphor for uniform phosphor deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple LED elements are used to achieve uniform light emission, then the lighting coverage is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention divides the lighting area into multiple mounting areas, each containing a small number of LED elements (1-3 LEDs per mounting area). This segmentation allows uniform light emission to be achieved through spatial distribution rather than requiring many LEDs in a single area, thereby reducing device complexity while maintaining illumination uniformity.
2Ease of manufacture
If particulate phosphor is used in the sealing resin, then the manufacturing process is simplified, but color borders and uneven light distribution occur
Solution Approach 1:
The invention applies different phosphor configurations to different mounting areas. Each mounting area can have phosphor applied locally around the LED elements, allowing the sealing resin to maintain simplicity in application while achieving uniform light distribution through localized phosphor placement rather than uniform coverage. This resolves the contradiction by making phosphor distribution non-uniform in a controlled manner that eliminates color borders.
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 design achieves uniform light emission and luminance across the mounting area by ensuring the dummy elements and LEDs have the same height and shape, preventing color borders and uneven light distribution, thus providing consistent brightness and color.
Implementation Method 1
The sealing resin body includes a phosphor. The phosphor absorbs at least part of light emitted from the light-emitting element, changes the wavelength of the absorbed light, and emits the light.
Data Source
AI summary
A light-emitting device includes a base, a substrate, a plurality of light-emitting elements, a filler, and a sealing resin body. The base includes an upper surface and a mounting area. The substrate is disposed on the upper surface of the base. The substrate includes an opening. The mounting area is exposed from the opening of the substrate. The plurality of light-emitting elements are disposed on the mounting area of the base at predetermined intervals with one another. The filler is disposed around each of the plurality of light-emitting elements. The sealing resin body includes a phosphor. The sealing resin body is configured to seal the light-emitting elements and the filler.