Auxiliary Spacer Reduces Parasitic Capacitance in Gate Driver
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Solution Overview
Problem
In liquid crystal display devices, particularly in the gate-in-panel (GIP) type, parasitic capacitance between thin film transistors of the gate driver and the common electrode causes incorrect operation, and particles entering the gate driver lead to electrical shorts and signal delays, affecting the output of gate-driving signals.
Innovation Solution
The implementation of auxiliary spacers between the gate driver and the second substrate, and between the signal line and the second substrate, formed from organic materials, to prevent particle entry and reduce parasitic capacitance, thereby ensuring accurate operation and maintaining signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the gate driver is integrated in the panel (GIP type), then device integration and compactness are improved, but parasitic capacitance between thin film transistors and common electrode increases causing incorrect operation
Solution Approach 1:
An auxiliary spacer is introduced as an intermediary component between the gate driver and the common electrode. This spacer acts as a physical barrier that prevents particles from reaching the gate driver while also reducing parasitic capacitance, thereby resolving the operational issues caused by direct integration without sacrificing integration benefits
2Device complexity
If the gate driver is integrated in the panel, then manufacturing complexity is reduced, but particles can enter the gate driver causing electrical shorts and signal delays
Solution Approach 1:
The auxiliary spacer is formed in advance during the manufacturing process, before the gate driver becomes fully operational. This preliminary protective structure is built into the device architecture, providing ongoing protection against particle contamination without requiring additional complex manufacturing steps later
3Reliability
If auxiliary spacers are added between the gate driver and second substrate, then parasitic capacitance is reduced and particle entry is prevented, but device complexity and manufacturing steps increase
Solution Approach 1:
The auxiliary spacer serves multiple functions simultaneously: it acts as a physical barrier against particle contamination, reduces parasitic capacitance between the gate driver and common electrode, and maintains structural integrity. This multi-functionality justifies the additional component by providing multiple benefits from a single structural element
Data Source
AI summary
A liquid crystal display device includes first and second substrates spaced apart from each other, on which a display area and a non-display area are defined, a liquid crystal layer interposed between the first and second substrates, a seal pattern in the non-display area between the first and second substrates, a driver in the non-display area on the first substrate, column spacers in the display area between the first and second substrates, and a first auxiliary spacer between the driver and the second substrate.