Semiconductor Light Emitting Element Array with Optical Bridge
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Solution Overview
Problem
Conventional semiconductor light emitting element arrays exhibit uneven color and brightness distribution due to the absence of light emitting elements in intervening regions, leading to lower light emission and a yellowish color temperature from fluorescent material-filled streets.
Innovation Solution
Incorporating bridge portions with electrical insulating and optical guiding properties between adjacent semiconductor light emitting elements to cover and equalize the amount of fluorescent material, ensuring uniform light emission and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If fluorescent material is filled in the street regions between LED elements, then the street regions can emit yellow light, but the color temperature becomes lower and color distribution becomes uneven
Solution Approach 1:
The patent applies local quality by making the street regions have the same optical properties as the LED element regions. The bridge portions are formed with the same refractive index and fluorescent material composition as the LED elements, creating local uniformity in optical characteristics across the entire array surface, thereby achieving uniform color distribution.
Solution Approach 2:
The patent achieves homogeneity by ensuring that both the LED element regions and street regions have identical optical properties. The bridge portions are designed to have the same refractive index and fluorescent material composition as the LED elements, making the entire array appear as a uniform light-emitting surface with consistent color temperature and distribution.
2Illumination intensity
If fluorescent material is filled in the street regions, then light emission from streets increases, but the brightness distribution becomes uneven compared to LED element regions
Solution Approach 1:
The bridge portions are designed with local quality that matches the LED elements. By forming the bridge portions with the same refractive index and fluorescent material properties, the street regions locally acquire the same light-emitting characteristics as the LED elements, resulting in uniform brightness distribution across the entire array.
Solution Approach 2:
The bridge portions act as intermediary structures that transfer and uniformize the optical properties between the LED element regions and the street regions. These bridge portions mediate the optical interaction by having identical refractive index and fluorescent material composition, ensuring seamless transition and uniform brightness across the array.
3Stability of the object's composition
If bridge portions with optical guiding properties are introduced, then light distribution becomes uniform, but the device structure becomes more complex
Solution Approach 1:
The bridge portions serve multiple functions simultaneously: they provide electrical insulation between adjacent LED elements, guide and transmit light from the LED elements, and contain fluorescent material to emit light in the street regions. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving uniform light distribution.
Solution Approach 2:
The patent merges the functions of electrical insulation, optical guidance, and light emission into a single integrated structure - the bridge portion. By combining these functions into one component with unified material composition and refractive index, the device complexity is minimized while achieving the desired uniform color and brightness distribution.
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 mitigates uneven color and brightness distribution by guiding light from the emitting elements through the bridge portions, resulting in consistent color temperature and brightness across the array.
Implementation Method 1
bridge portion (BR) formed in each of the streets (ST)... having optical guiding property
Implementation Method 2
A yellow fluorescent material (phosphor) layer 218 formed of a transparent resin including yellow fluorescent (phosphor) powder 219
Data Source
AI summary
A semiconductor light emitting element array contains: a support substrate; a plurality of semiconductor light emitting elements disposed on said support substrate, a pair of adjacent semiconductor light emitting elements being separated by street, each of the semiconductor light emitting elements including; a first electrode formed on the support substrate, a semiconductor lamination formed on the first electrode and including a stack of a first semiconductor layer having a first conductivity type, an active layer formed on the first semiconductor layer, and a second semiconductor layer formed on the active layer, and having a second conductivity type different from the first conductivity type, and a second electrode selectively formed on the second semiconductor layer of the semiconductor lamination; and connection member having electrical insulating property and optically propagating property, disposed to cover at least part of the street between a pair of adjacent semiconductor laminations.