Liquid Crystal Display Device with Vertical Common Electrode
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current liquid crystal display devices face challenges with low light transmission, light leakage, and color mixture, particularly in achieving high pixel density, as they struggle to balance pixel size, storage capacitance, and electric field confinement.
Innovation Solution
The design includes a substrate with pixel regions defined by gate and data lines, a common electrode, and a pixel electrode pattern with a second common electrode electrically connected to the first, along with light shielding elements and a stable spacer structure to minimize light leakage and color mixture while maintaining high pixel density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pixel size is reduced to achieve high pixel density, then pixel density is improved, but storage capacitance decreases and light transmission is reduced
Solution Approach 1:
The patent introduces a second common electrode positioned above the data line in the third dimension, creating a vertical electric field component that supplements the conventional horizontal field. This dimensional addition allows for enhanced pixel control and increased effective capacitance without increasing planar pixel area, thereby maintaining high pixel density while improving storage capacitance
Solution Approach 2:
The second common electrode is nested within the existing pixel structure, positioned above the data line and integrated with the conventional electrode arrangement. This nested configuration adds functional capability (improved capacitance and field control) without requiring additional lateral space, thus preserving high pixel density
2Productivity
If pixel size is reduced to achieve high pixel density, then pixel density is improved, but light transmission is reduced
Solution Approach 1:
The second common electrode is selectively positioned only above the data line region, creating a localized electric field enhancement precisely where needed for pixel control. This localized approach improves pixel performance without adding broad-area structures that would block light, thereby maintaining high light transmission across the overall pixel area
3Ease of manufacture
If electrode design is simplified for manufacturing, then ease of manufacture is improved, but light leakage and color mixture increase
Solution Approach 1:
The common electrode function is segmented into two separate electrodes: a first common electrode at the conventional position and a second common electrode positioned above the data line. This segmentation creates distinct functional zones that independently control different aspects of the electric field, allowing for precise confinement of electric fields to reduce light leakage and color mixture while maintaining manufacturing simplicity through the use of standard transparent conductive materials
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 enhances light transmittance, reduces flicker, and achieves high pixel density by confining electric fields and using light shielding elements, while maintaining structural integrity and flexibility in spacer design.
Implementation Method 1
liquid crystal molecules are controlled by a transverse electric field which is substantially parallel to the substrate surface. When a voltage is applied to the pixel electrode pattern, the liquid crystal molecules rotate in a plane which is substantially parallel to the substrate surface to allow light transmittance
Implementation Method 2
light shielding elements and a stable spacer structure to minimize light leakage and color mixture
Data Source
AI summary
A liquid crystal display device includes a substrate having pixel regions and a counter substrate opposed thereto. Gate lines and data lines intersect to define the pixel regions. A first common electrode overlaps the data lines and is disposed on a first insulating layer that is disposed on the substrate and the data lines. A second insulating layer is disposed between the first common electrode and a pixel electrode pattern that is disposed on the first insulating layer and insulated from the first common electrode. A second common electrode is disposed on one of the data lines and electrically connected to the first common electrode. A projection of the second common electrode on the substrate overlaps a projection of the one of the data lines on the substrate. A spacer is disposed on the substrate and is overlapped with the one of the data lines.