Driving Back Plate Layout for High-PPI Micro-LED Redundancy
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Solution Overview
Problem
The redundancy repair scheme for micro light-emitting diode (micro-LED) display panels is not applicable to driving back plates with high pixels per inch (PPI) due to the large area occupied by each sub-pixel, which is a result of the need for sufficient space between main and redundant electrode pairs.
Innovation Solution
A driving back plate design with a connection line between main and redundant electrode pairs, featuring a cutting portion to enable redundancy repair without increasing the pixel driving unit's length or width, allowing for high PPI applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a redundancy repair scheme is adopted with main and redundant electrode pairs, then the yield of micro light-emitting diode chips is improved, but the area occupied by each sub-pixel increases
Solution Approach 1:
The connection line merges the electrical connection function for both main and redundant electrode pairs into a single shared pathway. This allows the redundant electrode pair to share the same connection line structure as the main electrode pair, eliminating the need for separate dedicated connection lines and reducing the overall space required for redundancy implementation.
Solution Approach 2:
The connection line is designed to serve multiple functions: it provides electrical connection to both the main electrode pair and the redundant electrode pair. This multi-functional design allows the same structural element to support both primary and backup configurations, maximizing space utilization while maintaining redundancy capability.
2Reliability
If sufficient space is reserved between main and redundant electrode pairs, then the reliability of the redundancy repair scheme is improved, but the pixel driving unit area increases
Solution Approach 1:
The electrode pairs are arranged in a sequential linear configuration along the connection line rather than requiring two-dimensional separation. This linear arrangement along a single dimension (the connection line path) allows sufficient electrical isolation and functional reliability while minimizing the overall area footprint of the pixel driving unit.
Solution Approach 2:
The design provides sufficient space and electrical isolation specifically at critical points along the connection line where main and redundant electrode pairs interact, rather than uniformly increasing space throughout the entire pixel structure. This localized quality approach ensures reliability where needed while minimizing overall area consumption.
Data Source
AI summary
A driving back plate, a display panel, and a preparation method therefor. The driving back plate includes a plurality of pixel driving units. At least one of the pixel driving units includes a main electrode pair and at least one redundant electrode pair. A second electrode of the main electrode pair, a first electrode of the main electrode pair, a first electrode of a redundant electrode pair, and a second electrode of the redundant electrode pair are arranged sequentially in a first direction. At least one of the pixel driving units includes a connection line. The connection line includes a cutting portion. A signal on the connection line is configured to be input between the redundant electrode pair and the cutting portion.