TFT Pixel Electrode Slit Pattern for LCD Defect Repair
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Solution Overview
Problem
Conventional methods for repairing electrical defects in liquid crystal displays (LCDs) result in significant degradation of display quality due to the need to remove entire capacitor electrodes and large portions of pixel electrodes, leading to reduced effective displaying regions and unstable voltage maintenance.
Innovation Solution
A method and system utilizing a predetermined pattern of capacitor electrodes and pixel electrodes with slits to isolate and repair defects, allowing for the preservation of at least half a storage capacitor and most of the capacitor of liquid crystal, thereby maintaining display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used to repair electrical defects by removing entire capacitor electrodes and large portions of pixel electrodes, then electrical defects are eliminated, but display quality degrades due to reduced effective displaying regions
Solution Approach 1:
The pixel electrode is divided into multiple independent regions by introducing slits, allowing selective removal of only the defective portion while preserving other functional regions. This segmentation enables localized repair without compromising the entire pixel structure, thus eliminating electrical defects while maintaining adequate displaying area.
Solution Approach 2:
The invention applies different treatments to different regions of the pixel electrode: the defective region is removed, while the non-defective regions are preserved. This local quality approach ensures that repair actions are precisely targeted, eliminating defects in affected areas while maintaining the integrity and functionality of healthy displaying regions.
2Reliability
If conventional methods remove entire capacitor electrodes to repair defects, then electrical isolation is achieved, but voltage maintenance becomes unstable due to loss of capacitor capacity
Solution Approach 1:
The capacitor electrode is segmented into multiple independent capacitor regions through the introduction of slits in the pixel electrode. This segmentation allows the system to isolate and remove only the defective capacitor region while preserving other functional capacitor regions, thereby maintaining sufficient total capacitor capacity for stable voltage holding while achieving the necessary electrical isolation.
Solution Approach 2:
The slits are pre-formed in the pixel electrode structure before defect occurrence, creating predetermined isolation zones. This preliminary action prepares the structure for potential future defect isolation, allowing rapid and precise electrical isolation of defective regions without compromising the overall capacitor capacity needed for voltage stability.
3Manufacturing precision
If slits are introduced in the pixel electrode to enable selective defect repair, then repair precision is improved, but device complexity increases
Solution Approach 1:
The pixel electrode is segmented by introducing slits that create distinct isolated regions. This segmentation enables precise targeting of defective areas during repair while maintaining a relatively simple overall structure. The slits serve as natural boundaries that facilitate precise repair operations without requiring complex additional components or structures.
Data Source
AI summary
A displaying device at least comprises a thin film transistor (TFT); a first electrode controlled by the TFT; a first capacitor electrode and a second capacitor electrode electrically connected to each other through the first electrode. The first electrode has a first slit. The first slit is positioned between a first zone and a second zone, wherein the first zone connects the first capacitor electrode and the first electrode, and the second zone connects the second capacitor electrode and the first electrode. If a defect is observed, a portion of the first electrode is removed for isolating the first capacitor electrode and the second capacitor electrode.