Bent Pixel Electrodes Stabilize Liquid Crystal Orientation Under Pressure
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Solution Overview
Problem
Liquid crystal display devices with a transverse electric field multi-domain structure experience display heterogeneity due to a reverse twist phenomenon when subjected to external pressure, such as finger touch, which does not return to a normal state uncontrolledly.
Innovation Solution
The implementation of pixel electrodes with parallel electrode portions that are bent at central portions and connected by bridge portions, stabilizing the electric field and allowing the liquid crystal molecules to return to their original orientation state when pressure is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transverse electric field multi-domain structure is adopted to improve viewing angle characteristics, then viewing angle performance is improved, but display heterogeneity occurs when external pressure is applied
Solution Approach 1:
The pixel electrode is divided into multiple electrode portions (first electrode portion, second electrode portion, third electrode portion) that extend in different directions. Each portion independently controls liquid crystal molecules in its respective domain, allowing localized response to external pressure and enabling the overall display to maintain homogeneity while preserving wide viewing angle characteristics.
Solution Approach 2:
Different electrode portions are configured with different extension directions relative to the liquid crystal layer orientation. This creates local variations in electric field direction across the pixel, causing liquid crystal molecules to orient differently in each domain. When pressure is applied, each domain responds locally, preventing the reverse twist phenomenon that causes display heterogeneity.
2Illumination intensity
If electrode portions are bent in different directions to create multi-domain structure, then viewing angle is improved, but reverse twist phenomenon occurs under finger touch
Solution Approach 1:
The pixel electrode is segmented into multiple portions extending in different directions, creating multiple domains with different liquid crystal orientation directions. This segmentation allows the display to maintain wide viewing angle characteristics while the structured configuration prevents the reverse twist phenomenon by distributing the electric field across multiple domains that respond cooperatively to external pressure.
Solution Approach 2:
The electrode portions are configured with asymmetric extension directions relative to the liquid crystal layer orientation. This asymmetric configuration creates domains with different tilt angles, which prevents the reverse twist phenomenon by ensuring that the electric field always maintains a component that counteracts the pressure-induced distortion, thereby preserving display homogeneity under finger touch.
3Reliability
If pixel electrodes are structured with multiple electrode portions extending in different directions, then display heterogeneity is reduced, but device complexity increases
Solution Approach 1:
The pixel electrode is divided into multiple electrode portions that can be independently patterned and controlled. This segmentation enables precise control of liquid crystal orientation in different domains, achieving display homogeneity under pressure while maintaining a relatively simple overall structure that can be manufactured using standard semiconductor fabrication processes.
Solution Approach 2:
The multi-portion electrode structure serves multiple functions simultaneously: it creates multiple domains for wide viewing angle, provides pressure distribution for homogeneous display under touch, and maintains compatibility with existing FFS mode manufacturing processes. This multi-functionality reduces the need for additional components or complex control mechanisms.
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 solution effectively eliminates display heterogeneity caused by the reverse twist phenomenon, enhancing the display characteristics and maintaining a stable display even under external pressure, particularly in touch panel applications.
Implementation Method 1
a liquid crystal display device which drives liquid crystal molecules by using a transverse electric field mode
Implementation Method 2
liquid crystal molecules are driven in different rotational direction in the two regions into which the pixel 'a' is divided
Data Source
AI summary
An embodiment of the invention provides a display device having a common electrode and pixel electrodes disposed in an insulating state on one of a pair of substrates between which a liquid crystal layer is held, in which each of the pixel electrodes includes a plurality of electrode portions disposed in parallel with one another, each of the electrode portions has a flat surface shape in which each of the electrode portions is bent approximately at a central portion in an extension direction, and each of the pixel electrodes also includes a bridge portion through which corresponding ones of the electrode portions are connected to one another in the bending portion.