TFT Array Panel Floating Electrode Overlap Capacitance
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Solution Overview
Problem
Existing liquid crystal displays face challenges in improving response time without increasing power dissipation or introducing issues like residual images and flickering, due to limitations in optimizing driving voltage and liquid crystal materials.
Innovation Solution
A thin film transistor array panel design that includes a gate line, data line, and a floating electrode overlapping the data line, which increases the capacitance of the storage capacitor by forming additional overlap capacitors, thereby enhancing the charging and discharging speed of the liquid crystal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the storage capacitor capacitance is increased to prevent voltage changes and cusps, then the response time is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the storage capacitor function with existing electrode structures by making the pixel electrode overlap with the data line, thereby combining the display function and charge storage function into a single structural arrangement rather than adding separate components
Solution Approach 2:
The patent transitions from a planar layout to a three-dimensional overlapping structure where the pixel electrode is positioned above the data line in the vertical dimension, creating capacitance through spatial layering rather than expanding horizontal area
2Speed
If the pixel electrode is designed to overlap the data line to form additional capacitance, then the response speed is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The data line serves dual functions: as a signal transmission conductor and as one electrode of the storage capacitor, eliminating the need for separate capacitor electrodes and reducing alignment complexity
Solution Approach 2:
The pixel electrode is segmented into multiple regions, with specific portions positioned to overlap the data line at predetermined intervals, allowing precise capacitance control through distributed overlapping segments rather than requiring uniform high-precision alignment across the entire electrode
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
This design improves the response speed of liquid crystals by increasing the overall capacitance, preventing delays caused by cusps between frames and maintaining the gamma value adjustment within target curves.
Implementation Method 1
increases the capacitance of the storage capacitor by forming additional overlap capacitors
Data Source
AI summary
According to an embodiment of the present invention, a thin film transistor array panel includes a gate line and a data line insulated from each other an insulating substrate where the gate line and the data line cross each other to define a pixel region, a thin film transistor (TFT) disposed at an intersection of the gate line and the data line, a floating electrode where at least a portion of the floating electrode overlaps the data line, and a pixel electrode disposed at the pixel region where the pixel electrode is connected to the TFT and overlaps the at least a portion of the floating electrode.