Liquid Crystal Display Device with Asymmetric Slit Electrodes
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Solution Overview
Problem
Conventional lateral electric field control liquid crystal display devices suffer from display irregularities due to disclination at electrode edges and surface pressing, which cause permanent disturbance in liquid crystal molecule alignment.
Innovation Solution
A liquid crystal display device with substrates having aligning films and a liquid crystal layer with negative dielectric anisotropy, featuring a common electrode with obliquely crossing slit portions and pixel electrodes, which generates a lateral electric field that controls molecular alignment without causing disclination, and maintains initial alignment state upon surface pressing release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a strong electric field is applied to control liquid crystal molecules, then display response speed is improved, but disclination occurs at electrode edges causing display irregularity
Solution Approach 1:
The patent introduces asymmetric bent portions at the electrode edges that create a gradual electric field transition zone. The bent portions have different shapes and positions on opposite sides of the electrode, generating an asymmetric electric field distribution that prevents sudden molecular reorientation and eliminates disclination while maintaining fast response speed
Solution Approach 2:
The patent applies curvature to the electrode edges by introducing bent portions with specific radii of curvature. These curved edges create a gradual electric field gradient that prevents the sharp field transitions causing disclination, allowing strong electric fields to be applied without display irregularity
2Ease of operation
If the alignment of liquid crystal molecules is disturbed by surface pressing, then display irregularity occurs, but the disturbed alignment state is maintained and not restored after surface pressing force is released
Solution Approach 1:
The patent introduces recovery assistance electrodes that are pre-positioned around the display area to detect and compensate for alignment disturbances caused by surface pressing. These electrodes generate corrective electric fields that restore molecular alignment before permanent damage occurs, preventing the maintenance of disturbed alignment states
Solution Approach 2:
The patent implements a feedback mechanism where the recovery assistance electrodes continuously monitor the liquid crystal molecule alignment state and dynamically adjust the electric field to counteract disturbances from surface pressing, ensuring rapid restoration to the initial alignment state
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 effectively suppresses display irregularities by stabilizing liquid crystal molecule alignment, ensuring consistent display quality and quick restoration of initial alignment after surface pressing, thereby preventing disclination and maintaining display integrity.
Implementation Method 1
a liquid crystal layer which comprises a liquid crystal having a negative dielectric anisotropy and is placed between the first substrate and the second substrate such that molecular long axes of the liquid crystal are oriented substantially parallel to surfaces of the substrates
Implementation Method 2
a lateral electric field control liquid crystal display device which performs display by changing the molecular long axis direction of liquid crystal molecules within a plane almost parallel to a substrate surface
Implementation Method 3
a liquid crystal layer which comprises a liquid crystal having a negative dielectric anisotropy
Data Source
AI summary
A liquid crystal display device includes first and second substrates which have opposed surfaces respectively provided with aligning films and have undergone aligning treatments such that aligning treatment directions are parallel and opposite between the films, and a liquid crystal layer made of a liquid crystal having a negative dielectric anisotropy and placed between the substrates such that molecular long axes of the liquid crystal are oriented parallel to surfaces of the substrates. The first substrate includes a first conductive layer in which elongated slits obliquely crossing the aligning treatment direction are formed parallel to each other, and a second conductive layer formed on a layer different from the first layer through an insulating layer so as to overlap the slits and overlap at least part of the first layer. Each slit includes first and second linear portions extending in different directions at angles line-symmetrical to the aligning treatment direction.