Light Emitting Device Sidewall for Uniform Illuminance
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Solution Overview
Problem
Conventional light emitting diodes typically emit monochromatic light and require multiple diodes to achieve desired illuminance, leading to dark shadows between the diodes due to their narrow light distribution.
Innovation Solution
A light emitting device with at least two light emitting cells grown on a single substrate and electrically connected, surrounded by a sidewall that minimizes dark shadows by ensuring uniform light distribution, and optionally includes a wavelength converter and pad electrodes for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light emitting diodes are mounted in a single module to achieve desired illuminance, then the illuminance is improved, but dark shadows are formed at locations corresponding to spaces between the light emitting diodes
Solution Approach 1:
Multiple light emitting cells (first, second, third, and fourth light emitting cells) are integrated into a single light emitting element structure, eliminating the spaces between separate diodes that cause dark shadows. The cells are arranged in a 2x2 matrix configuration and electrically connected through internal conductors within the same semiconductor substrate, achieving uniform light distribution while maintaining high illuminance.
2Device complexity
If conventional light emitting diodes are used with narrow light distribution, then device complexity is reduced, but uniform light distribution cannot be achieved
Solution Approach 1:
The light emitting element is segmented into multiple light emitting cells (first, second, third, and fourth cells) arranged in a matrix pattern, with each cell contributing to the overall light output. This segmentation allows for broader and more uniform light distribution while maintaining a relatively simple single-element structure compared to mounting multiple separate diodes.
Solution Approach 2:
The light emitting cells are arranged in a two-dimensional matrix configuration (2x2) on the semiconductor substrate, transitioning from linear or single-point emission to a distributed areal emission pattern. This dimensional arrangement expands the light distribution pattern and reduces shadow formation while keeping the device structure integrated and relatively simple.
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 device achieves higher illuminance with reduced dark shadows compared to conventional setups, providing uniform light emission.
Implementation Method 1
A light emitting diode may refer to an inorganic semiconductor device that emits light through recombination of electrons and holes
Implementation Method 2
emits light through recombination of electrons and holes
Implementation Method 3
The wavelength converter may be configured to convert a wavelength of light emitted from the light emitting element
Data Source
AI summary
The present disclosure relates to a light-emitting device and a vehicular lamp including the same. The light-emitting device may include a light-emitting unit and a sidewall. The light emitting unit may include a light-emitting element. The sidewall may surround a side of the light-emitting unit and adjoin the side of the light-emitting unit. The light-emitting element may include at least two light-emitting cells grown on a single growth substrate and may be electrically connected to one another.