Display Substrate Repair Electrode for Defect Correction
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Solution Overview
Problem
Existing display substrates face challenges in repairing defects, particularly those caused by non-forming contact holes connecting drain electrodes and pixel electrodes, which complicates the process of darkening defective pixels.
Innovation Solution
Incorporating a repair electrode that overlaps with storage lines and is electrically connected to drain electrodes, allowing for selective repair by shorting either the repair electrode with storage lines or drain electrodes using a laser beam, depending on the defect type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laser beam is used to enforce shorting of storage line and pixel electrode for darkening defective pixels, then display quality is improved, but repairing of pixels with non-forming contact holes becomes difficult
Solution Approach 1:
The invention segments the repair approach into two distinct paths: one for darkening defective pixels (shorting storage line and pixel electrode) and another for restoring contact holes (shorting drain electrode and pixel electrode). This segmentation allows selective repair based on defect type, resolving the contradiction between improving display quality and maintaining ease of repair for different defect scenarios.
Solution Approach 2:
The invention introduces a repair electrode as an intermediary element that facilitates both types of repairs. By connecting the repair electrode to either the storage line or drain electrode through laser-induced shorting, it enables flexible repair pathways for different defect types, thereby maintaining ease of repair while improving overall display quality.
2Ease of repair
If repair electrode is added to enable selective repair, then ease of repair is improved, but device complexity increases
Solution Approach 1:
The repair electrode serves multiple functions: it can be connected to the storage line for darkening defective pixels, or connected to the drain electrode for restoring contact holes. This multi-functionality allows a single additional element to enable selective repair capabilities without requiring multiple separate repair structures, thereby limiting the increase in device complexity.
Solution Approach 2:
The repair electrode is positioned in a different spatial dimension (overlapping with storage lines in the planar view) to enable laser-induced shorting connections. This dimensional arrangement allows for flexible electrical connections without adding significant structural complexity to the existing multi-layer display substrate architecture.
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 and selective repair of defective pixels by ensuring electrical connections are restored, thereby improving display substrate reliability and quality.
Implementation Method 1
a repairing process enforcedly offing a defective pixel is performed using a laser beam
Data Source
AI summary
A display substrate includes a gate metal pattern including a gate line extending in a first direction, a gate electrode electrically connected to the gate line and a storage line, a data metal pattern including a data line extending in a second direction crossing the first direction, a source electrode electrically connected to the data line and a drain electrode spaced apart from the source electrode, a repair electrode extending in the second direction and overlapping the storage line, an organic layer disposed on the data metal pattern and a pixel electrode disposed on the organic layer and electrically connected to the drain electrode.