Liquid Crystal Composition for 240 Hz Display Response Time
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Solution Overview
Problem
Liquid crystal displays at high driving frequencies, such as 240 Hz, face challenges with response time, motion picture defects, and afterimages due to the limitations of existing liquid crystal compositions, particularly in controlling transmittance and alignment of liquid crystal molecules.
Innovation Solution
A liquid crystal display composition incorporating a polar compound represented by Formula 1, along with neutral compounds, is used, which includes specific alkyl and alkoxy groups, optimizing the refractive anisotropy, dielectric anisotropy, and rotational viscosity to reduce afterimages and enhance motion picture quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high driving frequency of 240 Hz is implemented, then motion picture quality is improved, but response time becomes insufficient and afterimages occur due to limitations of existing liquid crystal compositions
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the liquid crystal material. Specifically, it introduces a polar compound with formula (1) containing halogen, alkyl, and alkoxy groups, and a neutral compound with formula (2) containing specific alkyl groups. These compositional parameter changes optimize the liquid crystal's response characteristics, enabling adequate response time even at high driving frequencies of 240 Hz, thus resolving the contradiction between high productivity and time loss.
2Productivity
If a high driving frequency of 240 Hz is implemented, then motion picture quality is improved, but afterimages and motion picture defects increase due to limitations of existing liquid crystal compositions
Solution Approach 1:
The patent employs parameter changes by adjusting the liquid crystal composition to include specific polar and neutral compounds. The polar compound (formula 1) with halogen, alkyl, and alkoxy groups, combined with the neutral compound (formula 2) with specific alkyl groups, creates optimized optical and electrical parameters. This compositional optimization reduces afterimages and motion picture defects while maintaining high driving frequency operation, effectively resolving the contradiction between high productivity and harmful object-generated factors.
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 proposed liquid crystal composition effectively reduces afterimages, improves response time, and enhances motion picture quality by minimizing ghost, bounce blur, and tail blur, while maintaining a high driving frequency of 240 Hz.
Implementation Method 1
voltages are applied to the field generating electrodes so as to generate an electric field over a liquid crystal layer, and then the alignment of liquid crystal molecules of the liquid crystal layer is determined by the electric field
Implementation Method 2
the alignment of liquid crystal molecules of the liquid crystal layer is determined by the electric field. Accordingly, the polarization of incident light is controlled
Implementation Method 3
A liquid crystal display includes two display panels on which field generating electrodes, such as a pixel electrode and common electrode, are disposed, and includes a liquid crystal layer, which is interposed between the panels
Data Source
AI summary
A liquid crystal display includes a first substrate; a second substrate facing the first substrate; a pair of field generating electrodes disposed on at least one of the first and the second substrates; and a liquid crystal layer disposed between the first and the second substrates; wherein the liquid crystal layer includes a liquid crystal composition including a polar compound, the polar compound including a compound represented by Formula 1:wherein A representsX is a halogen, R1 is a substituted or unsubstituted C1-C10 alkyl group or a substituted or unsubstituted C1-C10 alkoxy group and R2 is a C1-C5 alkyl group or a C1-C5 alkoxy group.