Micro LED Backup Anode Routing for Display Uniformity
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Solution Overview
Problem
In micro LED display panel manufacturing, the transfer of light-emitting diodes often results in some diodes being unable to emit light, leading to dark lines in the display due to insufficient backup sub-pixel regions, affecting display uniformity and effectiveness.
Innovation Solution
A display panel design with alternately arranged display and backup sub-pixel regions, where each display sub-pixel region is connected to multiple backup anodes, allowing for flexible compensation by bonding backup light-emitting diodes to backup anodes connected to non-functional display diodes, improving display uniformity and reliability without increasing backup region space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If backup sub-pixel regions are provided with backup light-emitting diodes, then reliability is improved, but area occupied by backup regions increases
Solution Approach 1:
The backup sub-pixel regions are designed to serve multiple functions: they can act as backup regions when display sub-pixel regions fail, and simultaneously function as display regions when activated. This multi-functionality allows the same physical space to serve both display and backup purposes, eliminating the need for separate dedicated backup areas.
Solution Approach 2:
The patent implements a dual-state system where backup sub-pixel regions can switch between being non-emissive (backup state) and emissive (display state). By controlling the emission state rather than adding physical space, the system achieves backup functionality without increasing the physical area occupied by backup regions.
2Reliability
If display sub-pixel regions and backup sub-pixel regions are alternately arranged, then reliability is improved, but display uniformity deteriorates due to dark lines
Solution Approach 1:
The system dynamically controls the emission state of backup sub-pixel regions. When a display sub-pixel region fails, the corresponding backup sub-pixel region transitions from a non-emissive state to an emissive state, allowing it to compensate for the failure. This dynamic switching ensures display uniformity is maintained while preserving reliability benefits.
Solution Approach 2:
The patent applies different emission characteristics to different regions based on their functional state. Display sub-pixel regions emit light during normal operation, while backup sub-pixel regions remain non-emissive unless needed. When a backup region activates, it locally compensates for the failed display region, maintaining overall display uniformity without requiring all backup regions to emit simultaneously.
3Adaptability or versatility
If multiple backup anodes are electrically connected to display anodes, then adaptability is improved, but device complexity increases
Solution Approach 1:
The electrical connection system is segmented into modular units where each backup anode is independently connected to specific display anodes through defined pathways. This segmentation allows the system to activate only the necessary backup connections when needed, managing complexity through modular organization rather than requiring all possible connections to be simultaneously active.
Solution Approach 2:
The electrical connections between backup anodes and display anodes are pre-configured during manufacturing, but the actual activation of these connections occurs later when failures are detected. This preliminary setup of connection pathways without immediate activation reduces operational complexity while maintaining adaptability when compensation is needed.
Data Source
AI summary
A display panel includes an array substrate and light-emitting diodes including display light-emitting diodes. A display area includes sub-pixel regions including display sub-pixel regions and backup sub-pixel regions. In each of first and second directions, the display sub-pixel regions and the backup sub-pixel regions are arranged alternately. Display anode and cathode are provided in each display sub-pixel region. Backup anode and cathode are provided in at least one backup sub-pixel region. The display anode located in one display sub-pixel region is connected to the backup anodes of at least two backup sub-pixel region, and/or, at least two backup anodes provided in one backup sub-pixel region are electrically connected to the display anodes of at least two display sub-pixel regions, respectively. A positive pin of the display light-emitting diode is bonded to the display anode, and a negative pin thereof is bonded to the display cathode.