Liquid Crystal Display Electrode Structure for Alignment Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-speed transverse field mode liquid crystal display devices face challenges in achieving further improvement of alignment stability compared to conventional fringe field switching mode devices.
Innovation Solution
The design includes a first and second substrate with a liquid crystal layer in between, featuring a first electrode and a second electrode with comb-like structures and connecting portions that project beyond the outermost comb-like electrodes, which helps in controlling the alignment of liquid crystal molecules and enhancing alignment stability by creating a regular rotational direction of the molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a high-speed transverse field mode liquid crystal display device is used, then response speed is improved, but alignment stability is insufficient
Solution Approach 1:
The patent applies local quality by creating different field distributions in different regions of the liquid crystal layer. The electrode structure generates a transverse field in the central region for fast response, while the fringe field extends to the peripheral regions to provide additional alignment control and stability. This spatial differentiation of field characteristics allows simultaneous optimization of response speed and alignment stability.
Solution Approach 2:
The patent employs asymmetry in the electrode configuration, where the pixel electrode and common electrode are positioned at asymmetric locations relative to the liquid crystal layer. This asymmetric arrangement creates a fringe field that extends beyond the direct transverse field region, providing enhanced alignment control at the edges and improving overall alignment stability while maintaining fast response characteristics.
2Reliability
If a conventional fringe field switching mode is used, then alignment stability is achieved, but response speed is slow
Solution Approach 1:
The patent segments the electric field into two distinct components: a transverse field component for rapid switching and a fringe field component for alignment stability. By separating these functions spatially and electrically, the system achieves both fast response speed from the transverse field and stable alignment from the fringe field, overcoming the limitations of conventional single-mode operation.
Solution Approach 2:
The patent merges the advantages of transverse field mode (fast response) and fringe field mode (alignment stability) into a hybrid operation. The electrode structure simultaneously generates both field types, combining their beneficial effects to achieve performance superior to either mode alone, thereby resolving the trade-off between response speed and alignment stability.
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 results in faster response speed and improved alignment stability by reducing irregularities in the rotational directions of liquid crystal molecules, maintaining the initial alignment state and enhancing luminosity distribution.
Implementation Method 1
a transverse field produced between these electrodes is used to control the alignment of the liquid crystal molecules in the liquid crystal layer
Implementation Method 2
a fringe field produced therebetween is used to control the liquid crystal molecules
Implementation Method 3
a high-speed transverse field mode liquid crystal display device is known as a liquid crystal display device with faster response and improved alignment stability
Data Source
AI summary
According to one embodiment, a display device includes a first substrate with a first alignment film, a second substrate with a second alignment film, and a liquid crystal layer interposed therebetween. The first substrate has first and second electrodes. An initial alignment direction of liquid crystal molecules of the liquid crystal layer is parallel to a first direction or a direction orthogonal to the first direction. The second electrode includes comblike electrodes extending parallel to the first direction and a connecting portion which connects the comblike electrodes. The connecting portion includes a projection which projects in a second direction more than an outermost comblike electrode.