LED Contact Layout for Symmetrical Light Emission
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Solution Overview
Problem
Existing light-emitting diodes (LEDs) in display panels face challenges in achieving symmetrical left and right light emission, leading to deviations in white balance and luminance when viewed from different angles, due to inefficiencies in current injection and light concentration.
Innovation Solution
A light-emitting diode design with a current concentration region positioned at the center of the light-emitting surface, featuring a second contact electrode disposed between the first and second connection pads, optimized in size and placement to ensure symmetrical light emission by concentrating current effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional LED structure without a dedicated current concentration region is used, then the device complexity is reduced, but the light emission symmetry and white balance deteriorate
Solution Approach 1:
The patent applies local quality by creating a specific current concentration region with modified electrical properties (different doping concentration or structure) at the center of the light-emitting surface. This localized modification concentrates current flow in a specific region to achieve symmetrical light emission, while the rest of the LED structure remains conventional, thus balancing manufacturing precision improvement with acceptable device complexity.
2Ease of manufacture
If the second contact electrode is positioned off-center, then the ease of manufacture is improved, but the luminance uniformity and white balance deteriorate
Solution Approach 1:
The patent intentionally introduces asymmetry through the off-center positioning of the second contact electrode relative to the light-emitting surface. This asymmetric configuration is designed to compensate for inherent asymmetries in current spreading or light extraction, ultimately achieving more uniform luminance distribution and better white balance across the viewing angle, while maintaining reasonable ease of manufacture through standard fabrication processes.
3Manufacturing precision
If the current concentration region is not optimized, then the device complexity is reduced, but the color accuracy and display performance deteriorate
Solution Approach 1:
The patent optimizes the current concentration region by adjusting key parameters such as doping concentration, layer thickness, or geometric dimensions of the contact electrode and underlying layers. These parameter modifications are designed to concentrate and uniformly distribute current flow across the active region, improving color accuracy and display performance while maintaining a structure that can be integrated into conventional LED manufacturing processes with minimal added complexity.
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
This design enhances the symmetry of light emission, improving white balance and reducing luminance deviation when viewed from different angles, thereby enhancing the display's color accuracy and overall performance.
Implementation Method 1
The active layer may be configured to emit light in a red wavelength band
Data Source
AI summary
A light-emitting diode may include: a first semiconductor layer including a light-emitting surface; a second semiconductor layer; an active layer between the first semiconductor layer and the second semiconductor layer; a first contact electrode electrically connected to the first semiconductor layer; a second contact electrode electrically connected to the second semiconductor layer; a first connection pad electrically connected to the first contact electrode; and a second connection pad electrically connected to the second contact electrode, wherein a current concentration region of the light-emitting diode is between the first connection pad and the second connection pad.