Shielding Electrode for LCD Signal Interference
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Solution Overview
Problem
In liquid crystal display (LCD) devices using FFS or IPS modes, the common electrode often overlaps with data lines, leading to signal interference and poor display quality due to coupling capacitance, causing issues like screen flickering.
Innovation Solution
An array substrate design featuring a first shielding electrode connected to a DC voltage signal output terminal, positioned between the data line and common electrode, which electrically insulates them and prevents coupling capacitance by forming a weak or no electric field, maintaining uniform voltage across the common electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the common electrode overlaps with the data line to achieve broader electrode coverage, then the electrode area is increased, but coupling capacitance is formed causing signal interference and display quality degradation
Solution Approach 1:
A shielding electrode is introduced as an intermediary component between the data line and the common electrode. This shielding electrode is connected to a DC voltage signal output terminal and positioned to overlap with both the data line and common electrode, effectively blocking the coupling capacitance formed between the data line and common electrode while allowing both electrodes to maintain their required areas for proper display function
2Stability of the object's composition
If the common electrode overlaps with the data line to achieve uniform voltage distribution, then the voltage uniformity is improved, but coupling capacitance causes voltage fluctuations and screen flickering
Solution Approach 1:
The shielding electrode serves as a mediator that is connected to the DC voltage signal output terminal. By positioning this shielding electrode between the data line and common electrode, it provides a stable reference potential that prevents voltage fluctuations in the common electrode caused by coupling capacitance, thereby eliminating screen flickering while maintaining uniform voltage distribution
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 prevents signal interference from data voltage on the common electrode, ensuring stable voltage and preventing screen flickering, thereby improving display quality by maintaining uniform voltage across the common electrode.
Implementation Method 1
a first shielding electrode disposed on the first passivation layer, wherein the first shielding electrode is connected to a direct current (DC) voltage signal output terminal... Through a shielding effect of the first shielding electrode on the data line, a weak electric field or no electric field is formed between the first shielding electrode and the common electrode
Data Source
AI summary
The present application provides an array substrate and a display device. By placing a first shielding electrode between the data line and the common electrode arranged opposite to each other, the first shielding electrode is connected to a DC voltage signal, so that a data voltage signal of the data line does not affect a signal of the common electrode. This prevents coupling capacitance between the common electrode and the data line, and prevents poor display quality like screen flickering.