Rod-Shaped LED Layout With Light-Transmitting Structure for Uniform Emission
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Solution Overview
Problem
Existing light-emitting devices using rod-shaped LEDs face challenges in achieving uniform light emission due to non-uniform distribution and alignment of these LEDs within the device.
Innovation Solution
A light-emitting device design that includes a substrate with unit light-emitting areas, first and second electrodes separated by a light-transmitting structure, and rod-shaped LEDs aligned between these electrodes, with reflective contact electrodes at the ends of the LEDs to ensure uniform light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If rod-shaped LEDs are used to create ultra-small light-emitting devices, then the device size can be reduced to microscale or nanoscale, but the light emission uniformity deteriorates due to non-uniform distribution and alignment of the rod-shaped LEDs
Solution Approach 1:
A light-transmitting structure is introduced as an intermediary component between the rod-shaped LEDs and the external environment. This structure has a refractive index different from that of the rod-shaped LEDs, creating refraction at the interface to redirect light paths and achieve uniform light emission from the device.
Solution Approach 2:
The refractive index parameter is utilized to solve the uniformity problem. By selecting a light-transmitting structure with a specific refractive index that differs from the rod-shaped LEDs, the light propagation characteristics are changed through refraction, transforming non-uniform emission into uniform emission.
2Illumination intensity
If a light-transmitting structure with different refractive index is introduced to improve light emission uniformity, then the light emission uniformity is improved, but the device complexity increases
Solution Approach 1:
The light-transmitting structure performs multiple functions simultaneously: it serves as both a structural component that holds the rod-shaped LEDs in place and an optical component that refracts light to achieve uniform emission. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
3Illumination intensity
If rod-shaped LEDs are aligned between separated first and second electrodes, then the light emission uniformity is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The light-transmitting structure is designed and positioned in advance to compensate for potential alignment variations of the rod-shaped LEDs. By pre-establishing the refractive interface geometry, the system can achieve uniform light emission even with moderate alignment tolerances, reducing the stringent precision requirements during manufacturing.
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 proposed design achieves uniform light emission across the unit light-emitting areas, enhancing the light-emitting efficiency and ensuring consistent luminance, even with non-uniformly distributed rod-shaped LEDs.
Implementation Method 1
a light-transmitting structure disposed between the first and second electrodes and extending to cross the rod-shaped LEDs
Implementation Method 2
light emitted from the rod-shaped LEDs is transmitted toward the front of the substrate
Implementation Method 3
a reflective contact electrode disposed on opposite ends of the rod-shaped LEDs to electrically connect the rod-shaped LEDs to the first and second electrodes
Data Source
AI summary
A light-emitting device includes: a substrate; a unit light-emitting area disposed on the substrate; first and second electrodes disposed in the unit light-emitting area to be separated from each other; a plurality of rod-shaped LEDs disposed between the first and second electrodes; a reflective contact electrode disposed on opposite ends of the rod-shaped LEDs to electrically connect the rod-shaped LEDs to the first and second electrodes; and a light-transmitting structure disposed between the first and second electrodes and extending to cross the rod-shaped LEDs.