TFT Substrate Common Electrode Shielding Data Line
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Solution Overview
Problem
Conventional liquid crystal display panels face challenges in maintaining a high aperture ratio while avoiding the influence of data lines on the liquid crystal layer, which can lead to light leakage and increased parasitic capacitance, causing signal cross-talk.
Innovation Solution
A TFT substrate design featuring a first common electrode covering the data line, with insulating layers between the common electrode and pixel electrode, effectively shielding the electric field and reducing parasitic capacitance, thereby enhancing the aperture ratio and preventing signal cross-talk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-shielding structure is formed at the location near the crossed portion of the pixel electrode and the data line, then the electric field influence of the data line on the liquid crystal layer is shielded and light leakage is prevented, but the aperture ratio of the panel is lowered
Solution Approach 1:
A common electrode layer is introduced as an intermediary component between the data line and the pixel electrode. This common electrode layer, positioned in the insulating layer above the data line, acts as a mediator to shield the electric field influence from reaching the liquid crystal layer, thereby preventing light leakage without requiring light-shielding structures that would reduce the aperture ratio.
2Area of stationary object
If the pixel electrode is extended over the data line, then the aperture ratio is ensured to be high, but the parasitic capacitance between the pixel electrode and the data line is increased, raising the likelihood of signal cross-talk
Solution Approach 1:
The common electrode layer serves as an intermediary that electrically isolates the pixel electrode from the data line. By positioning the common electrode layer above the data line and within the insulating layer, it creates an electrical barrier that reduces parasitic capacitance between the pixel electrode and data line, thereby minimizing signal cross-talk while allowing the pixel electrode to extend over the data line for high aperture ratio.
3Object-affected harmful factors
If the first common electrode is made of transparent conductive metal or transparent conductive metal oxide, then the electric field shielding effect is achieved while maintaining transparency, but the manufacturing complexity increases compared to opaque materials
Solution Approach 1:
The material composition of the common electrode layer is changed from traditional opaque conductive materials to transparent conductive metals or transparent conductive metal oxides. This parameter change enables the common electrode to simultaneously achieve electric field shielding functionality and optical transparency, which is essential for display applications where the electrode structure should not interfere with light transmission.
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 solution ensures a higher aperture ratio and improved display quality by shielding the electric field from the data line, reducing the likelihood of signal cross-talk and maintaining high display performance.
Implementation Method 1
a first insulating layer disposed on the first substrate and the data line; a first common electrode disposed on the first insulating layer and above the data line to cover the data line; a second insulating layer disposed on the first common electrode and the first insulating layer
Data Source
AI summary
A thin film transistor (TFT) substrate and a liquid crystal display panel are provided. The TFT substrate includes: a first substrate; a data line disposed on the first substrate; a first insulating layer disposed on the first substrate and the data line; a first common electrode disposed on the first insulating layer and above the data line to cover the data line; a second insulating layer disposed on the first common electrode and the first insulating layer; and a pixel electrode disposed on the second insulating layer.