LCD Shield Electrode Leakage Field Control
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Solution Overview
Problem
Current liquid crystal display devices using lateral or oblique electric fields face challenges in maintaining display quality and efficiency, particularly in high-definition displays where pixel pitch is small and electrode widths are thin, leading to potential display defects and increased power consumption due to leakage fields and capacitance issues.
Innovation Solution
The liquid crystal display device employs a configuration with multiple common electrodes and sub-common electrodes on both substrates, set to the same potential, which forms equipotential surfaces to shield leakage fields and reduce capacitance, along with strategically placed sub-common electrodes to improve redundancy and uniform electric field control, thereby enhancing display quality and reducing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lateral electric field mode is used for high-definition display, then pixel pitch can be reduced, but display defects increase due to thin electrode widths and leakage fields
Solution Approach 1:
A shield electrode is introduced as an intermediary component between the pixel electrode and common electrode. This shield electrode acts as a mediator to block leakage electric fields that would otherwise cause display defects, thereby maintaining high display quality even with reduced pixel pitch in high-definition displays.
Solution Approach 2:
The common electrode is divided into multiple segments (first common electrode and second common electrode) separated by the shield electrode. This segmentation allows for better control of electric field distribution and reduces unwanted capacitance effects, improving display reliability at high definitions.
2Manufacturing precision
If electrode widths are reduced for high-definition display, then pixel density increases, but power consumption increases due to leakage fields and capacitance
Solution Approach 1:
The shield electrode serves as a blocking intermediary that prevents leakage fields from extending beyond the pixel electrode edges. By confining the electric field more tightly, the shield electrode reduces parasitic capacitance and associated power consumption, enabling high pixel density displays with lower energy usage.
3Reliability
If shield electrode is added to reduce leakage fields, then display quality improves, but device complexity increases
Solution Approach 1:
The shield electrode is configured to maintain equipotential conditions with the common electrode, simplifying the electrical design. By keeping the shield electrode at the same potential as the common electrode, the structure reduces complexity in voltage control while still achieving the goal of blocking leakage fields and improving display quality.
4Stability of the object's composition
If multiple common electrodes are used to control electric field, then uniformity improves, but capacitance increases
Solution Approach 1:
The shield electrode extracts or removes the harmful leakage field components from the electric field distribution. By taking out the unwanted field portions that would otherwise contribute to non-uniformity and excess capacitance, the system achieves better electric field uniformity with reduced energy loss.
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 configuration improves display quality by minimizing defects and power consumption, allowing for higher definition displays with reduced influence from leakage fields and capacitance, while maintaining initial alignment of liquid crystal molecules for effective switching between ON and OFF states.
Implementation Method 1
a structure using lateral electric field, such as IPS (In-Plane Switching) mode and FFS (Fringe Field Switching) mode is put to practical use. Liquid crystal molecules are switched by the lateral electric field substantially in parallel with the principal surface of the array substrate
Implementation Method 2
another technique is also proposed, in which the liquid crystal molecules are switched using the lateral electric field or an oblique electric field between the pixel electrode formed in the array substrate and the common electrode formed in a counter substrate
Implementation Method 3
employs a configuration with multiple common electrodes and sub-common electrodes on both substrates, set to the same potential, which forms equipotential surfaces to shield leakage fields and reduce capacitance
Implementation Method 4
maintaining initial alignment of liquid crystal molecules for effective switching between ON and OFF states
Data Source
AI summary
In a liquid crystal display device, a first interlayer insulating film is arranged on a gate line and first, second and third source lines. A first common electrode includes a first sub-common electrode on the first interlayer insulating film and facing the gate line. A second insulating film covers the first common electrode. A first main pixel electrode extends on the second interlayer insulating film between the first source line and the second source line. A second main pixel electrode extends on the second interlayer insulating film between the second source line and the third source line. A second common electrode includes a second sub-common electrode extending on the second interlayer insulating film between the first source line and the second source line so as to face the first sub-common electrode, and is cut out between the second source line and the third source line.