Display Device Blocking Portion Parasitic Capacitance
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Solution Overview
Problem
In liquid crystal display devices operating in fringe field switching mode, parasitic capacitance induced by electric fields through repair openings can degrade display quality by causing a short circuit between the common electrode and the drain or source lines, leading to reduced image quality.
Innovation Solution
Incorporating blocking portions between the pixel electrode connecting lines and signal lines to mitigate the electric field and thereby reduce parasitic capacitance, ensuring that the blocking portions are connected to the same potential as the common electrode to effectively block the electric field and maintain display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If repair openings are provided in the common electrode to enable laser beam repair, then ease of repair is improved, but parasitic capacitance increases causing display quality to deteriorate
Solution Approach 1:
A blocking portion is introduced as an intermediary element between the pixel electrode connecting line and the signal line. This blocking portion, positioned within the repair opening area, mediates the electric field interaction by blocking parasitic capacitance formation while allowing the repair opening to remain functional for laser beam access. The blocking portion effectively isolates the connecting line from the signal line's electric field, preventing harmful parasitic capacitance without compromising repair capability.
2Device complexity
If the pixel electrode connecting line is disposed close to the signal line for compact design, then device complexity is reduced, but parasitic capacitance increases causing display quality to deteriorate
Solution Approach 1:
The blocking portion serves as an intermediary structure that enables close spacing between the pixel electrode connecting line and signal line without direct electric field coupling. By positioning the blocking portion between these lines, the design achieves compact layout while the blocking portion prevents parasitic capacitance formation, thus maintaining display quality despite reduced spacing.
Solution Approach 2:
The repair opening, which initially causes harmful parasitic capacitance, is converted into a beneficial structure by placing the blocking portion within it. The blocking portion utilizes the repair opening's space to provide electric field blocking, transforming the previously harmful electric field pathway into a controlled region where parasitic capacitance is prevented while maintaining compact design.
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
The implementation of blocking portions between the pixel electrode connecting lines and signal lines effectively reduces parasitic capacitance, preventing a decrease in display quality and allowing for reliable repair of source lines without compromising image display.
Implementation Method 1
The blocking portion is disposed between a connecting portion of the pixel electrode connected to the pixel electrode connecting line and the signal line to block an electric field between the connection portion and the signal line
Data Source
AI summary
A display device includes a pixel electrode, a signal line, a pixel electrode, and a blocking portion. The signal line is configured to transmit a signal to the pixel electrode. The pixel electrode connecting line is disposed a predefined distance apart from the signal line and connected to the pixel electrode. The blocking portion is disposed between a connecting portion of the pixel electrode connected to the pixel electrode connecting line and the signal line to block an electric field between the connection portion and the signal line.