IPS LCD Flicker Suppression via Flexoelectric Coefficient Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional IPS liquid crystal display devices experience flicker intensity due to parasitic capacitance and flexoelectric polarization, which cannot be completely eliminated even with optimal DC offset voltage, affecting display quality.
Innovation Solution
The solution involves optimizing the liquid crystal layer with flexoelectric coefficients e11 and e33 set at 7 pC/m or less, dielectric anisotropy, and elastic constants K11 and K33, along with specific electrode configurations and dielectric cap placement to minimize transmittance fluctuations and flexoelectric polarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DC offset voltage is applied to suppress flicker, then flicker intensity is reduced, but transmittance fluctuations occur due to flexoelectric polarization
Solution Approach 1:
The patent optimizes flexoelectric coefficients (e11 and e33) of the liquid crystal layer to specific ranges (e11: -15 to +15 pC/m, e33: -20 to +20 pC/m) to minimize flexoelectric polarization effects. This parameter optimization allows the system to achieve both flicker suppression and transmittance uniformity without requiring DC offset voltage that would cause transmittance fluctuations
2Adaptability or versatility
If pixel electrodes and common electrode are placed on the same substrate (IPS configuration), then viewing angle is improved, but flicker occurs due to parasitic capacitance
Solution Approach 1:
The patent optimizes the flexoelectric coefficients of the liquid crystal layer to specific ranges that minimize flexoelectric polarization effects. By controlling these material parameters, the invention suppresses flicker in IPS configurations without sacrificing the wide viewing angle advantage, achieving both flicker suppression and wide viewing angle simultaneously
Solution Approach 2:
The patent introduces a compensation electrode configuration where the common electrode is divided into multiple regions with different potentials. This intermediary structure compensates for the potential distribution unevenness caused by parasitic capacitance, thereby suppressing flicker while maintaining the IPS configuration's wide viewing angle特性
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 approach effectively suppresses flicker intensity to a level that does not impact display quality, allowing for improved viewing angles and color reproduction by reducing transmittance fluctuations and flexoelectric polarization effects.
Implementation Method 1
flexoelectric coefficients e11 and e33, both absolute values of which are +7 pC/m or less
Implementation Method 2
dielectric anisotropy, and elastic constants K11 and K33
Implementation Method 3
an effective optical axis is rotated in a plane by rotating liquid crystal molecules in an in-plane direction
Implementation Method 4
a first polarization plate placed on a side opposite to a side of the first substrate on which the liquid crystal layer is placed; a second polarization plate placed on a side opposite to a side of the second substrate on which the liquid crystal layer is placed
Data Source
AI summary
Provided is a liquid crystal display device including: a first substrate; a second substrate; a liquid crystal layer sandwiched between the first and the second substrates; a first polarization plate placed on a side of the first substrate; a second polarization plate placed on a side of the second substrate; and a pixel electrode and a common electrode which are provided on the side of the second substrate on which the liquid crystal layer is placed, in which: at least one of the pixel electrode and the common electrode is interdigital; and the liquid crystal layer has flexoelectric coefficients e11 and e33, both absolute values of which are +7 pC/m or less. Accordingly, a flicker intensity in an IPS liquid crystal display device is suppressed to such a degree as not to influence display quality.