Repair Panel Overlay for Defective OLED Emission Regions
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Solution Overview
Problem
Existing display devices lack an effective method for repairing defective regions, particularly when defects occur in the emission layers, which complicates the repair process.
Innovation Solution
A display device configuration that includes a repair panel with connection electrodes and emission layers, which is positioned over the defective area of the display panel, electrically connected to the display panel's electrodes, and uses laser irradiation to couple the panels and restore functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a repair panel is introduced to repair defective regions, then the reliability of the display device is improved, but the device complexity increases due to the additional panel structure and connection requirements
Solution Approach 1:
The display device is divided into a display panel and a separate repair panel. The repair panel contains repair emission layers that can be independently activated to repair defective regions. This segmentation allows the repair function to be added without modifying the original display panel structure, thus improving reliability while controlling complexity through modular design.
Solution Approach 2:
The repair panel is positioned to overlap with the display panel, with the repair emission layers nested above the defective regions. The connection electrodes extend through the repair substrate to establish electrical connections with the display panel's electrodes. This nesting approach allows the repair functionality to be integrated into the existing display structure without requiring a complete redesign.
2Manufacturing precision
If connection electrodes are extended through the repair substrate to establish electrical connections, then the emission efficiency is maintained uniformly, but the manufacturing precision requirements increase
Solution Approach 1:
The connection electrodes serve multiple functions: they establish electrical connections between the display panel and repair panel, provide structural support for the repair substrate, and enable uniform voltage distribution across the repair emission layers. This multi-functionality reduces the need for additional specialized components, simplifying the manufacturing process while maintaining emission uniformity.
Solution Approach 2:
The connection electrodes are designed to extend through the repair substrate to ensure uniform electrical potential distribution across the repair emission layers. By establishing reliable electrical connections at multiple points, the system maintains equipotential conditions that ensure uniform light emission from the repair panels, matching the brightness and intensity of the surrounding display regions.
3Reliability
If the repair panel is positioned to overlap the display panel, then the defective regions are effectively covered, but the thickness of the display device increases in the repaired region
Solution Approach 1:
The repair panel is positioned to overlap only the defective regions of the display panel, rather than covering the entire display area. This localized approach ensures that defective regions are effectively covered and repaired while minimizing the increase in overall device thickness. The repair emission layers are activated only in the regions where defects exist, providing targeted repair without unnecessary bulk.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables effective repair of defective regions by allowing the repair panel to emit light in place of the defective areas, maintaining uniform emission efficiency and preventing dark spots, thus extending the device's usability.
Implementation Method 1
the first electrode and the first repair electrode are electrically connected to each other through the connection electrode
Implementation Method 2
uses laser irradiation to couple the panels
Data Source
AI summary
A display device includes a display panel and a repair panel overlapping a region of the display panel. The display panel includes: a substrate; a plurality of transistors on the substrate; and a first electrode connected to the transistors. The repair panel includes: a repair substrate; a plurality of connection electrodes extending through the repair substrate and on opposite surfaces of the repair substrate; a first repair electrode connected to the connection electrodes; a first repair emission layer on the first repair electrode; and a repair common electrode on the first repair emission layer. In a region where the display panel and the repair panel overlap each other, the first electrode and the first repair electrode are electrically connected to each other through the connection electrode.