Pixel Structure Reducing Gate-Source Capacitance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display panels suffer from high gate to source capacitance (Cgs), leading to reduced pixel voltage, affected grey levels, and flicker phenomena due to the feed through voltage effect.
Innovation Solution
The pixel structure incorporates a specific design with a first and second active device, insulating layers, and connection electrodes, where the data line acts as a screening electrode to reduce gate to source capacitance by positioning the connection electrodes and data lines in a manner that minimizes overlap with the gate line, thereby reducing parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the connection electrode overlaps the gate line in the vertical projection direction, then the electrical connection is simplified, but the gate to source capacitance increases causing feed through voltage effect
Solution Approach 1:
The patent resolves the contradiction by transitioning from a two-dimensional planar overlap to a three-dimensional stacked arrangement. The connection electrode is positioned in a different vertical layer (above the insulating layer) relative to the gate line, allowing electrical connection while minimizing parasitic capacitance through spatial separation in the vertical dimension.
Solution Approach 2:
The insulating layer serves as an intermediary between the connection electrode and the gate line. This intermediate layer electrically isolates the connection electrode from the gate line, reducing the gate to source capacitance while still allowing the connection electrode to fulfill its electrical connection function through the contact hole in the insulating layer.
2Object-affected harmful factors
If the data line is positioned to minimize overlap with gate line, then gate to source capacitance is reduced, but the routing complexity increases
Solution Approach 1:
The patent divides the pixel structure into distinct functional regions with the data line routed through specific segments (first and second data lines for different sub-pixels). This segmentation allows each data line segment to be optimally positioned to minimize overlap with the gate line while maintaining efficient electrical connection to respective pixel electrodes.
Solution Approach 2:
The patent applies different routing strategies to different parts of the pixel structure. The data lines are positioned with specific local characteristics - the first data line serves the first pixel electrode while the second data line serves the second pixel electrode, with each routed to minimize local overlap with the gate line in its respective region.
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 effectively reduces the feed through voltage effect, maintaining pixel voltage and preventing flicker, while ensuring accurate grey levels during display.
Implementation Method 1
other parasitic capacitances such as the gate to source capacitance (Cgs) exist in the pixel structure of the conventional liquid crystal display panel
Data Source
AI summary
A pixel structure includes a gate line, a first data line, first and second pixel electrodes, first and second active devices, an insulation layer, and first and second connection electrodes. The first and second pixel electrodes are respectively disposed aside a first edge and a second edge of the gate line. The first drain electrode and second drain electrode of the first and second active devices both extend toward the second pixel electrode. The first connection electrode is electrically connected to the first drain electrode through a first contact hole and connected to the first pixel electrode; the first connection electrode and the first data line overlap in the vertical projection direction. The second connection electrode is disposed aside the second edge, and the second connection electrode is connected to the second pixel electrode and electrically connected to the second drain electrode through a second contact hole.