Liquid Crystal Display Panel Elastic Coefficient Ratio Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display panels experience delayed response times due to the slow rearrangement of liquid crystal molecules in response to electric fields, leading to afterimages on the screen.
Innovation Solution
A liquid crystal display panel design featuring a liquid crystal layer with a specific ratio of elastic coefficients (K33/K11) between 0.96 and 1.25, aligned perpendicular to the substrates, and a voltage range of 10-20V, which improves the response time by controlling the alignment of liquid crystal molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid crystal molecules are used in the display panel, then the display can control light transmittance through electric field application, but the response time is delayed causing afterimages on the screen
Solution Approach 1:
The patent changes the physical parameters of the liquid crystal molecules by selecting specific compounds with optimized elastic coefficients (K33/K11 ratio between 0.96-1.25) and dielectric anisotropy. This parameter optimization enables faster molecular rearrangement in response to electric fields, reducing response time while maintaining light transmittance control capability
Solution Approach 2:
The patent employs a composite liquid crystal composition containing multiple specific compounds (including cyclic carboxylic acid esters, bicyclic compounds, and other liquid crystal molecules) in defined weight ratios. This composite formulation achieves balanced elastic properties and dielectric characteristics that improve response speed while preserving the electro-optical modulation function
2Loss of time
If the elastic coefficient ratio K33/K11 is optimized to improve response time, then molecular rearrangement speed increases, but the liquid crystal composition becomes more complex to control
Solution Approach 1:
The patent establishes a specific parameter range for the K33/K11 elastic coefficient ratio (0.96-1.25) and dielectric anisotropy (-5 to -15 pC) that optimizes response time. By defining these parameter boundaries, the patent simplifies the composition development process while achieving fast response characteristics
Solution Approach 2:
The patent assigns specific functional roles to different liquid crystal compounds in the composition, with each compound contributing specific elastic and dielectric properties. This functional differentiation allows systematic optimization of the overall composition to meet the target K33/K11 ratio and dielectric anisotropy requirements
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 improved ratio of elastic coefficients and voltage alignment significantly reduce the decay time of liquid crystal molecules, enhancing the response time and minimizing afterimages in liquid crystal display panels.
Implementation Method 1
A liquid crystal display apparatus applies an electric field to specific molecules of liquid crystal in a liquid crystal cell to convert arrangements of the molecules
Implementation Method 2
the liquid crystal molecules may have a negative dielectric anisotropy
Implementation Method 3
change optical characteristics of the liquid crystal cell such as birefringence, optical activity, dichroism and light scattering
Data Source
AI summary
A liquid crystal display panel includes a first substrate including a pixel electrode, a second substrate a second substrate including a common electrode and disposed opposite to the first substrate, and a liquid crystal layer between the first substrate and the second substrate, where the liquid crystal layer includes liquid crystal molecules having an elastic coefficient of bend phase (K33) and an elastic coefficient of splay phase (K11), and a ratio of the elastic coefficient of bend phase (K33) to the elastic coefficient of splay phase (K11) of the liquid crystal molecules in the liquid crystal layer is in a range of about 0.96 to about 1.25.