Micro-LED Display Substrate Layout to Prevent Electrode Shorts
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Solution Overview
Problem
Micro-LED displays face challenges in transferring millions of semiconductor light-emitting devices due to difficulties in self-assembly methods, leading to potential shorts between wiring electrodes and reduced luminance.
Innovation Solution
A display device structure is designed with a substrate that includes assembly electrodes, a dielectric layer, partition walls, and a planarization layer, featuring holes that expose semiconductor light-emitting devices and wiring electrodes, preventing shorts by disconnecting the lower wiring electrode in non-assembled regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If self-assembly method is used to transfer semiconductor light-emitting devices, then large-area display implementation becomes feasible, but shorts may occur between wiring electrodes in regions where devices are not assembled
Solution Approach 1:
The substrate is divided into cell regions and non-cell regions, with wiring electrodes selectively formed only in cell regions where semiconductor light-emitting devices are assembled. This segmentation prevents shorts in non-assembled areas while maintaining electrical connectivity in active display regions.
Solution Approach 2:
The wiring electrode structure is made non-uniform: lower wiring electrodes are formed only in cell regions, while upper wiring electrodes extend across both cell and non-cell regions. This local quality differentiation ensures electrical connections exist only where needed, preventing shorts in non-assembled areas without compromising display performance.
2Ease of operation
If lower wiring electrode is continuous across the substrate, then electrical connectivity is maintained, but shorts occur in regions where semiconductor light-emitting devices are not assembled
Solution Approach 1:
The lower wiring electrode is segmented to exist only in cell regions, not continuously across the entire substrate. This segmentation eliminates the harmful short circuit effect in non-cell regions while preserving necessary electrical connectivity in active display areas through selective electrode placement.
3Measurement precision
If semiconductor light-emitting devices are densely assembled, then high-resolution display is achieved, but transfer process difficulty increases
Solution Approach 1:
Cell regions are pre-formed on the substrate before semiconductor light-emitting device assembly. This preliminary structuring guides device placement and simplifies the transfer process, enabling high-resolution displays without increasing manufacturing difficulty, as devices self-assemble into pre-defined cell regions.
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 structure prevents shorts between wiring electrodes, maintaining high luminance and enabling high-resolution displays with efficient semiconductor light-emitting devices.
Implementation Method 1
display device (display apparatus) using a semiconductor light-emitting device
Data Source
AI summary
A display apparatus according to the present invention comprises a substrate including semiconductor light-emitting devices and a wiring electrode electrically connected to the semiconductor light-emitting devices, wherein the substrate comprises: a base portion; assembly electrodes extending in one direction and arranged on the base portion; a dielectric layer formed to cover the assembly electrodes; a barrier portion formed on the dielectric layer while forming a cell on which the semiconductor light-emitting devices are mounted along an extension direction of the assembly electrodes; and a planarization layer formed to cover the barrier portion while forming a hole overlapping the cell, wherein the hole comprises: a first hole exposing the semiconductor light-emitting device; and a second hole exposing the dielectric layer or the base portion.