Display Pixel Pad Layout for Single-Cut Micro-LED Repair
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Solution Overview
Problem
The increasing resolution and size reduction of micro-LED display panels have made crystal grain transfer more difficult, necessitating a pixel structure that is easier to repair to enhance the repair yield and production efficiency.
Innovation Solution
The display panel design includes a substrate with display pixels featuring multiple pad sets, light-emitting devices, and connecting wires, where the connecting wires are strategically positioned in cutting regions to facilitate efficient repair by reducing the number of cuts required, thereby shortening repair time and improving production yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of the display panel is increased and the size of pads is reduced, then the display quality is improved, but the difficulty of crystal grain transfer increases and repair becomes more difficult
Solution Approach 1:
The display panel is divided into multiple pixel circuits, each with independent pad sets and connecting wires. The connecting wires are segmented into multiple sections with cutting regions positioned between them, allowing individual faulty components to be isolated and replaced without affecting the entire panel. This segmentation enables precise repair of specific defective light-emitting devices while preserving the rest of the high-resolution display.
2Measurement precision
If the number of crystal grain transfers is increased to achieve higher resolution, then the display quality is improved, but the complexity and difficulty of the transfer process increases
Solution Approach 1:
The pad sets and connecting wire structures are pre-configured on the substrate before crystal grain transfer. The cutting regions are pre-positioned between adjacent pixel circuits, and the connecting wires are designed with predetermined cutting locations. This preliminary arrangement simplifies the crystal grain transfer process by providing ready-made connection points and isolation regions, reducing the complexity of coordinating multiple transfers for high-resolution displays.
3Reliability
If multiple connecting wires are used to connect pad sets, then the electrical connectivity is improved, but the number of cuts required for repair increases
Solution Approach 1:
Multiple connecting wires are merged into a single integrated structure that contains all necessary connection paths. The cutting regions are positioned to simultaneously sever multiple connecting wires at once, allowing repair technicians to disconnect faulty components with a single cutting action rather than multiple separate cuts. This merging approach maintains comprehensive electrical connectivity while reducing repair time and complexity.
Data Source
AI summary
A display panel includes a substrate and display pixels. The display pixels are disposed on the substrate, and each of the display pixels includes pad sets, light-emitting devices, a first connecting wire, a second connecting wire, and first cutting regions. Each pad set has a first pad and a second pad. The light-emitting devices are electrically bonded to at least part of the pad sets. The first connecting wire is electrically connected to the first pads of a plurality of first pad sets of the pad sets. The second connecting wire is electrically connected to the second pads of the pad sets. The first cutting regions are disposed on one side of each of the first pad sets. Two first connecting portions of the first connecting wire and the second connecting wire connecting each of the first pad sets are located in one of the first cutting regions.