Branched Electrode LED Chip Optimizing Current Spread
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Solution Overview
Problem
The design of light emitting devices for small LED chips, such as those used in mobile phones and IT devices, faces challenges in optimizing the distance between electrodes to effectively manage current spreading length, which affects operational voltage and light output.
Innovation Solution
A light emitting device design that includes a first and second conductive semiconductor layer, a light-transmitting ohmic layer, and electrodes with specific branched configurations, where the distance between the branched electrodes is optimized to be between 1/10 to 1/2 of the short side width, enhancing current spreading efficiency and reducing operational voltage while maintaining or increasing light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between electrodes is reduced to fit small LED chip size, then the chip size restriction is satisfied, but the current spreading length is insufficient leading to poor optical characteristics
Solution Approach 1:
The electrode structure is segmented into multiple branches (first branched electrode and second branched electrode) that extend in the current spreading direction. This segmentation allows the electrodes to cover a larger effective area for current injection while maintaining a compact overall chip size, thereby improving current spreading without increasing chip footprint.
Solution Approach 2:
The electrode design transitions from a simple linear arrangement to a branched two-dimensional configuration. The electrodes extend in the current spreading direction (first direction) and are arranged to optimize current distribution across the active layer, effectively using spatial dimensionality to improve optical characteristics within size constraints.
2Reliability
If the distance between electrodes is increased to improve current spreading, then optical characteristics are enhanced, but the chip size becomes too large for mobile phone applications
Solution Approach 1:
The branched electrode configuration segments the current path into multiple parallel channels, effectively increasing the current spreading distance without proportionally increasing the linear electrode separation. This allows improved optical characteristics while maintaining compact chip dimensions suitable for mobile phones.
Solution Approach 2:
Multiple electrode branches are merged into a unified electrode structure that works协同 to improve current spreading. The combined effect of multiple branches provides enhanced optical characteristics equivalent to larger electrode spacing while maintaining a compact overall chip size.
3Ease of manufacture
If conventional electrode design is used without considering current spreading length, then manufacturing is simpler, but operational voltage is high and light output is reduced
Solution Approach 1:
The electrode design parameters (distance between branched electrodes, electrode width, branch configuration) are optimized based on calculated current spreading length. This parameter optimization reduces operational voltage and improves light output while maintaining manufacturability through standardized fabrication processes.
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 lowers the operational voltage and increases luminous efficiency by optimizing the distance between electrodes based on calculated current spreading length, resulting in improved optical characteristics and light output.
Implementation Method 1
a light-transmitting ohmic layer on the second conductive semiconductor layer
Implementation Method 2
electrons of an n layer are combined with holes of a p layer, and energy corresponding to band gap energy between a conduction band and a valence band may be generated, and when the energy is emitted in the form of light, the LED functions
Data Source
AI summary
A light emitting element according to one embodiment can comprise: a first conductive semiconductor layer; an active layer on the first conductive semiconductor layer; a second conductive semiconductor layer on the active layer; a light-transmitting ohmic layer on the second conductive semiconductor layer; a first electrode electrically connected with the first conductive semiconductor layer; and a second electrode on the light-transmitting ohmic layer. The light emitting element can include two first sides facing each other, and two second sides facing each other. The width of the first side is greater than the width of the second side, and the first side and the second side can be perpendicular to each other. The distance between the first branch electrode and the second branch electrode is ⅙ to ½ of the width of the second side of either one thereof.