Liquid Crystal Display Device With Slit Electrode For Response Speed
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Solution Overview
Problem
Conventional fringe field switching (FFS) mode liquid crystal display devices experience slow response speed due to reliance on viscoelasticity during decay time and insufficient rotational speed in the vicinity of upper and lower substrates, leading to inadequate response performance.
Innovation Solution
Incorporating a slit electrode on the upper substrate and utilizing fringe electric fields from the lower substrate in rise time and oblique electric fields between upper and lower substrates in decay time to forcibly rotate liquid crystal molecules, allowing for controlled switching in both directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional FFS mode utilizes only fringe electric fields from lower substrate electrodes, then rise time response is improved, but decay time response becomes slow due to reliance on viscoelasticity
Solution Approach 1:
The invention segments the electrode structure into paired electrodes on the lower substrate and a slit electrode on the upper substrate, allowing independent control of electric field generation during rise time and decay time. The lower substrate electrodes generate fringe electric fields for rise time response, while the upper substrate slit electrode generates oblique electric fields for decay time response, separating the functions that were previously combined in a single electrode structure.
Solution Approach 2:
The invention introduces a new dimension by adding the upper substrate slit electrode that extends in the row direction, perpendicular to the column-direction electrodes on the lower substrate. This dimensional addition enables the generation of oblique electric fields during decay time that were not possible with the conventional single-substrate electrode structure, providing a new mechanism for controlling liquid crystal molecule rotation in the decay phase.
2Area of stationary object
If conventional FFS electrodes are positioned only on lower substrate, then aperture ratio is improved, but response performance in vicinity of upper substrate becomes insufficient
Solution Approach 1:
The invention applies local quality by positioning the upper substrate slit electrode specifically in the column direction where it is needed to enhance the electric field in the vicinity of the upper substrate. This localized electrode placement provides enhanced rotational control where required (near the upper substrate) without adding electrodes throughout the entire display area, thus maintaining a high aperture ratio while improving response performance in the critical region near the upper substrate.
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 response speed in both rise and decay times, achieving a high response speed while maintaining a wide viewing angle.
Implementation Method 1
utilize electric fields generated between electrodes of the lower substrate to rotate liquid crystal molecules in the vicinity of the lower substrate in a horizontal plane
Implementation Method 2
utilize oblique electric fields generated between electrodes of the upper and lower substrates to rotate the liquid crystal molecules in the vicinity of the lower substrate in a horizontal plane in the opposite direction from that in rise time
Data Source
AI summary
The present invention provides a liquid crystal display device capable of achieving a high response speed. The liquid crystal display device includes: an upper substrate and a lower substrate; and a liquid crystal layer disposed between the upper and lower substrates, the upper substrate including an electrode, the lower substrate including paired electrodes, the liquid crystal layer containing liquid crystal molecules that are aligned in parallel with the main surfaces of the upper and lower substrates with no voltage applied, the liquid crystal display device being configured to provide one of white display and black display by utilizing an electric field generated between the paired electrodes of the lower substrate to rotate the liquid crystal molecules in one direction in a plane parallel to the main surfaces, and the other of white display and black display by utilizing an electric field generated by the respective electrodes of the upper and lower substrates to rotate the liquid crystal molecules in the opposite direction from the one direction in the plane parallel to the main surfaces.