Storage Capacitor Segmentation for Electrostatic Defect Prevention
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Solution Overview
Problem
Large-scale display devices face reliability issues due to electrostatic defects caused by plasma-generated charges during manufacturing, particularly in gate-in-panel configurations, leading to line-type defects and reduced luminance uniformity.
Innovation Solution
A storage capacitor design with divided metal patterns separated by buffer layers and transparent electrode connections, allowing for electrostatic charge isolation and easy repair by laser cutting, is implemented to prevent electrostatic defects and ensure reliable gate driving voltage transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large-scale display device uses a gate-in-panel configuration with continuous metal patterns for storage capacitors, then the capacitance value is sufficient for gate driving, but electrostatic charges generated during plasma manufacturing processes cause defects and reliability issues
Solution Approach 1:
The continuous metal pattern of the storage capacitor is divided into multiple separate metal patterns. These divided patterns are spaced apart from each other, preventing the accumulation and discharge of electrostatic charges that would otherwise cause defects. The segmentation maintains sufficient total capacitance while eliminating the harmful continuous charge storage path.
Solution Approach 2:
The problematic continuous metal pattern is extracted and replaced with discrete separated metal patterns. This removal of the continuous conducting path eliminates the root cause of electrostatic defects while the overall capacitor structure remains functional for gate driving operations.
2Object-affected harmful factors
If the storage capacitor metal pattern is divided into separate patterns, then electrostatic defects are prevented, but the capacitance value may be reduced
Solution Approach 1:
Multiple separate metal patterns are arranged to collectively provide the required capacitance. While each individual pattern is small and cannot store electrostatic charges, the combined effect of all patterns together achieves the necessary total capacitance value for proper gate driver operation.
Solution Approach 2:
The capacitor structure utilizes vertical stacking with insulating layers between metal patterns to increase capacitance density. By adding the dimension of layer stacking rather than relying solely on horizontal area, sufficient capacitance is achieved without requiring large continuous metal areas that would store electrostatic charges.
3Ease of manufacture
If a continuous metal pattern is used for the storage capacitor, then manufacturing is simpler, but laser cutting for repair is difficult and defects propagate as line-type failures
Solution Approach 1:
The metal pattern is segmented into multiple small discrete units rather than one continuous structure. This segmentation makes the structure inherently more amenable to selective laser cutting of individual patterns for repair, and prevents line-type defect propagation since defects are isolated to specific small patterns rather than affecting entire continuous lines.
Data Source
AI summary
Disclosed are a storage capacitor, a display device in which the storage capacitor is applied to a gate driver embedded in a substrate and a method for manufacturing the same. Reliability of the display device is improved through change in the configuration of the storage capacitor in the gate driver.