Display Substrate Shielding Electrode Design for Parasitic Capacitance
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Solution Overview
Problem
Liquid crystal display (LCD) substrates face challenges with parasitic capacitance, which can affect visibility and require additional manufacturing processes and costs due to the need for shielding electrodes to block electric fields.
Innovation Solution
A display substrate design that includes a shielding electrode with a first portion overlapping the data line and a second portion overlapping the gate line, allowing for improved visibility without additional manufacturing processes and omitting the need for a black matrix, thereby reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a shielding electrode is formed to block electric fields and eliminate parasitic capacitance effects, then visibility is improved, but manufacturing cost increases due to additional masks
Solution Approach 1:
The shielding electrode is merged with the data line structure, where the data line itself serves as the shielding electrode. This eliminates the need for separate shielding electrode formation processes and additional masks, thereby maintaining visibility improvement while reducing manufacturing cost.
Solution Approach 2:
The data line is given dual functionality: it serves both as the signal transmission line and as the shielding electrode to block electric fields. This multi-functionality eliminates the need for dedicated shielding structures and reduces overall device complexity and manufacturing cost.
2Reliability
If a shielding electrode is formed to block electric fields, then parasitic capacitance effects are eliminated, but device complexity increases
Solution Approach 1:
The shielding function is merged into the existing data line structure. The data line extends to overlap with the pixel electrode, creating the shielding effect without requiring separate shielding electrode layers or additional structural elements, thus eliminating parasitic capacitance while maintaining simple device architecture.
Solution Approach 2:
The data line performs multiple functions: signal transmission and electric field shielding. By making the data line extend beyond its typical termination point to overlap the pixel electrode, it simultaneously serves as both the signal conduit and the shielding barrier, reducing overall device complexity.
3Area of moving object
If the pixel electrode overlaps with the data line to increase aperture ratio, then aperture ratio is improved, but parasitic capacitance is generated
Solution Approach 1:
The data line overlap region, which would normally generate harmful parasitic capacitance, is converted into a beneficial shielding electrode. By extending the data line to overlap the pixel electrode, the same geometric configuration that creates parasitic capacitance is transformed into a structure that actively shields against electric field interference, turning the harmful effect into a useful function.
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 design enhances visibility by blocking electric fields and eliminates the need for a black matrix, resulting in cost savings and improved aperture ratios without increasing manufacturing complexity.
Implementation Method 1
A shielding electrode that blocks an electric field may be used to eliminate various effects caused by the parasitic capacitance
Data Source
AI summary
A display substrate includes a first switching element electrically connected to a gate line and that extends in a first direction and electrically connected to a data line that extends in a second direction crossing the first direction, an insulation layer disposed on the first switching element, a shielding electrode disposed on the insulation layer and a pixel electrode that partially overlap the shielding electrode. The shielding electrode includes a first portion that overlaps the data line and extends in the second direction and a second portion that overlaps the gate line and extends in the first direction.