LED Mesa Bridge Structure for Miniaturized Pixel Reliability
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Solution Overview
Problem
The reliability of light-emitting diodes (LEDs) is compromised during miniaturization of chip size, necessitating an optimized structure to enhance product reliability.
Innovation Solution
A light-emitting device is designed with a substrate, first and second mesa structures, current blocking elements, conductive bridging elements, and conductive pads. The mesa structures have a groove between them, and the current blocking elements extend to the side surfaces and bottom of the groove, while conductive bridging elements connect the mesa structures in series.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the chip size is miniaturized to achieve high pixel density, then the display resolution is improved, but the reliability of the LED is compromised
Solution Approach 1:
The LED chip is divided into multiple mesa structures (first mesa structure and second mesa structure) separated by grooves. This segmentation allows each mesa to be independently designed and optimized, improving current spreading while maintaining miniaturization for high pixel density
Solution Approach 2:
Different regions of the LED chip are given different functions: the mesa structures contain the active layers for light emission, the grooves provide isolation and current blocking, and the conductive bridging elements provide electrical connection. This local differentiation optimizes both pixel density and reliability
2Reliability
If the current blocking elements extend continuously to the groove bottom and side surfaces, then the current blocking is enhanced, but the device complexity increases
Solution Approach 1:
The current blocking elements serve multiple functions simultaneously: they block current leakage between adjacent mesas, provide structural support, and define the groove geometry. This multi-functionality enhances current blocking without proportionally increasing device complexity
Solution Approach 2:
The current blocking elements are merged with the groove structure, forming an integrated feature rather than separate components. The groove and current blocking elements work as a unified structure to contain and control current flow, reducing overall device complexity
Data Source
AI summary
A light-emitting device includes a substrate, a first and second mesa structures disposed on the substrate, at least one current blocking element, at least one conductive bridging element, and first and second conductive pads. The conductive bridging element is disposed on the current blocking element, and is electrically connected to the first and second mesa structures. The first and second conductive pads are electrically connected to the first and second mesa structures, respectively. The conductive bridging element has a projection image that is spaced apart from those of the first and second conductive pads in a plan view of the light-emitting device. A light-emitting module including the light-emitting device, and a display apparatus including the light-emitting device are also disclosed.