Micro LED Shared-Electrode Structure for Stable Mass Transfer
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Solution Overview
Problem
The challenge in micro light-emitting diode (μLED) display devices is the instability during mass transfer due to high aspect ratios, leading to tilting or peeling off, which reduces production yield and increases costs.
Innovation Solution
A micro light-emitting diode display device design where the first and second light-emitting elements share a continuous semiconductor material layer, reducing the aspect ratio and stabilizing the structure, and are formed simultaneously with electrodes connecting them, thereby enhancing stability and reducing the number of mass transfers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the critical dimensions of micro light-emitting diodes are reduced to achieve high resolution, then the display resolution is improved, but the stability during mass transfer deteriorates due to high aspect ratios
Solution Approach 1:
The patent merges multiple micro light-emitting diodes into a single integrated structure by sharing a common semiconductor layer and electrode. Specifically, the second electrode of adjacent μLEDs is formed as a continuous shared electrode layer, and the semiconductor layers are merged into a single continuous structure. This merging approach maintains the small critical dimensions of individual μLEDs for high resolution while creating a larger, more stable integrated structure that resists tilting and peeling during mass transfer processes
2Reliability
If separate electrodes are used for each light-emitting element to ensure electrical connection, then the electrical connectivity is improved, but the structural complexity and number of mass transfer steps increase
Solution Approach 1:
The shared second electrode layer serves multiple functions simultaneously: it provides electrical connection to multiple light-emitting elements, acts as a common structural support base, and eliminates the need for separate electrode formation steps for each μLED. This multi-functional design ensures reliable electrical connectivity while reducing the overall device complexity and minimizing the number of mass transfer operations required
Data Source
AI summary
A micro light-emitting diode display device includes a circuit substrate, a first light-emitting element, a second light-emitting element, a third light-emitting element, and a conductive layer. The first light-emitting element, the second light-emitting element, and the third light-emitting element are disposed on the circuit substrate and have a first electrode and a second electrode, respectively. The first electrode of the first light-emitting element, the first electrode of the second light-emitting element, and the first electrode of the third light-emitting element are electrically connected to the circuit substrate. The second electrode of the first light-emitting element and the second electrode of the second light-emitting element are a continuous semiconductor material layer. The second electrode of the third light-emitting element is separated from the second electrode of the first light-emitting element and the second electrode of the second light-emitting element.