Micro-LED Display Panel Repair Using Floating Mounting Electrodes
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Solution Overview
Problem
Micro-LED display panels face challenges in maintaining high definition and large scale due to issues with emission failures of individual light-emitting diodes, which can lead to color inconsistencies and reduced display quality.
Innovation Solution
A method is implemented where emission failures are detected, and additional light-emitting elements are mounted on electrically floating mounting electrodes, connected to the drive transistor, to maintain display quality by replacing faulty elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a large number of chip-like micro-LED are mounted in a display area to achieve higher definition and larger scale, then display resolution and size are improved, but emission failures of individual light-emitting diodes occur leading to color inconsistencies and reduced display quality
Solution Approach 1:
The patent changes the electrical state parameter of the mounting electrode from connected to floating state. By setting the mounting electrode to an electrically floating state when no light emitting element is mounted, the patent prevents electrical interference and potential emission failures, thereby maintaining reliability and emission consistency while preserving high display resolution
Solution Approach 2:
The patent applies beforehand cushioning by pre-configuring the mounting electrode to be in a floating state before any light emitting element is mounted. This preventive measure cushions against potential emission failures and color inconsistencies by ensuring that unmounted electrodes do not cause electrical interference, thus protecting display quality from the outset
2Reliability
If additional light-emitting elements are mounted on electrically floating mounting electrodes to replace defective micro-LEDs, then display quality and color consistency are maintained, but device complexity and manufacturing process complexity increase
Solution Approach 1:
The patent applies dynamics by making the mounting electrode's electrical state changeable - it can be switched between connected and floating states depending on whether a light emitting element is mounted. This dynamic configuration allows the system to adapt to different operational states, enabling replacement of defective micro-LEDs while maintaining manageable device complexity through flexible electrical connectivity
Data Source
AI summary
According to one embodiment, a display panel includes a substrate, a first insulating layer, and a plurality of pixels including sub-pixels of a plurality of colors, respectively. Each of the sub-pixels includes a drive transistor, a pixel electrode supplied with a signal having a current value controlled from the drive transistor, and a light emitting element mounted on the pixel electrode. Each of the pixels includes a mounting electrode located to be spaced apart from the pixel electrode. The mounting electrode is in an electrically floating state in a first pixel of the plurality of pixels.