Bank-Overlapping Electrodes for Rod-Type LED Direction Control
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Solution Overview
Problem
Current technologies face challenges in enhancing light emission efficiency in micro-scale or nano-scale rod-type LEDs for display devices, particularly in terms of light emission direction and external light interference.
Innovation Solution
The design includes a substrate with a light emitting element having first and second ends, partition walls, electrodes, and insulating layers, where the electrodes partially overlap the partition walls, and encapsulation layers are used to improve light emission efficiency and minimize external light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If rod-type LEDs are scaled to micro-scale or nano-scale for display device pixels, then device size is reduced, but light emission efficiency deteriorates
Solution Approach 1:
The patent transitions from planar LEDs to vertically oriented rod-type LEDs with length significantly greater than width. This dimensional change allows the light emission path to extend vertically through multiple semiconductor layers, increasing the effective emission area and efficiency despite the reduced horizontal footprint required for display pixels.
Solution Approach 2:
The rod-type LED is segmented into multiple semiconductor layers (first conductive type layer, second conductive type layer, and active layer) stacked vertically. This segmentation allows each layer to contribute to light emission, effectively increasing the total emission efficiency while maintaining a compact overall structure suitable for display devices.
2Ease of manufacture
If conventional LED structures are used, then manufacturing is simpler, but light emission direction control is poor
Solution Approach 1:
The patent employs an asymmetric rod-type structure where the length of the rod (vertical dimension) is significantly greater than its width (horizontal dimension). This asymmetric geometry inherently directs light emission preferentially along the vertical axis, improving light emission directionality without complicating the manufacturing process, as the asymmetric shape is achieved through standard vertical layer stacking.
3Device complexity
If standard electrode configurations are used, then device complexity is lower, but external light interference increases
Solution Approach 1:
The patent introduces partition walls as intermediary structures between adjacent rod-type LEDs. These partition walls serve multiple functions: they electrically isolate adjacent electrodes, prevent optical crosstalk between neighboring pixels, and reduce external light reflection by breaking up continuous reflective surfaces. This intermediary structure adds minimal complexity while effectively addressing external light interference.
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 configuration enhances light emission efficiency by optimizing the light emission direction and reducing external light reflection, thereby improving the overall performance of the display device.
Implementation Method 1
a light emitting element on the substrate and the light emitting element having a first end and a second end in a longitudinal direction
Implementation Method 2
encapsulation layers are used to improve light emission efficiency and minimize external light interference
Data Source
AI summary
A light emitting device including: a substrate; a light emitting element on the substrate, and having a first end and a second end in a longitudinal direction; first and second banks on the substrate and spaced apart from each other with the light emitting element interposed therebetween; a first electrode on the first bank and adjacent to the first end of the light emitting element; a second electrode on the second bank and adjacent to the second end of the light emitting element; a first contact electrode coupling the first electrode and the first end of the light emitting element, and a second contact electrode coupling the second electrode and the second end of the light emitting element. When viewed on a plane, the first electrode partially overlaps the first bank, and the second electrode partially overlaps the second bank.