FFS Liquid Crystal Display with Elevated Elastic Constants
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Solution Overview
Problem
Conventional FFS liquid-crystal displays require higher operating voltages and have reduced transmission when using dielectrically positive liquid crystals, which affects viewing-angle dependence and brightness, while dielectrically negative liquid crystals offer better transmission but at the cost of increased voltages and alignment issues.
Innovation Solution
The use of a structured electrode arrangement with a counterelectrode extending over the entire active area, combined with a liquid-crystalline modulation medium having elevated elastic constants, particularly K1 and K3, to enhance contrast, viewing-angle independence, and reduce operating voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dielectrically positive liquid crystals are used in FFS displays, then alignment is improved, but operating voltage increases and transmission decreases
Solution Approach 1:
The patent changes the elastic constant parameter (K1) of the liquid crystal material to a specific range (14.0-20.0 pN) to optimize the balance between alignment quality and operating voltage, allowing dielectrically positive liquid crystals to achieve good alignment at reduced voltages
Solution Approach 2:
The patent uses composite liquid crystal formulations containing specific compounds (cyclohexylbenzene derivatives, phenylcyclopropene derivatives, etc.) to achieve the desired elastic constant properties while maintaining good alignment characteristics
2Illumination intensity
If dielectrically negative liquid crystals are used in FFS displays, then transmission is improved, but operating voltage increases and alignment becomes problematic
Solution Approach 1:
The patent modifies the K1 elastic constant to a higher range (14.0-20.0 pN) which provides sufficient restoring force for reliable alignment of dielectrically negative liquid crystals while allowing operation at acceptable voltage levels and maintaining good transmission
3Adaptability or versatility
If conventional liquid crystal elastic constants are used, then material flexibility is maintained, but contrast is reduced and response time increases
Solution Approach 1:
The patent increases the K1 elastic constant to a specific range (14.0-20.0 pN) which enhances the liquid crystal's ability to maintain oriented states, thereby improving contrast ratio and reducing response time while preserving adequate material flexibility through controlled composition
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 achieves improved contrast, better transmission, and shorter response times with reduced operating voltages, maintaining good viewing-angle dependence and brightness.
Implementation Method 1
a liquid-crystalline modulation medium having elevated elastic constants, particularly K1 and K3
Implementation Method 2
an electrode arrangement comprising a structured electrode which has two or more structures which are essentially parallel to one another and are insulated from one another over a significant proportion of their length and a counterelectrode which extends essentially over the entire active area
Implementation Method 3
electro-optical light control element... electro-optical display... liquid-crystalline modulation medium
Data Source
AI summary
The present invention relates to an electro-optical light-modulation element of the FFS type, and to electro-optical displays and display systems, such as, for example, television screens and computer monitors, which contain elements of this type. The light-modulation elements according to the invention contain a liquid-crystalline modulation medium which has optimised elastic constants and are distinguished, in particular, by high contrast and/or optimised transmission in addition to good contrast, a low viewing-angle dependence, short response times and low addressing voltages. The present invention likewise relates to the liquid-crystalline modulation media used in the electro-optical light-modulation elements.