Liquid Crystal Display Driving Voltage Reduction via Flexoelectric Coefficients
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Solution Overview
Problem
Liquid crystal display devices require high driving voltages, which can lead to increased power consumption and limitations in viewing angle performance, particularly in IPS-mode panels where the alignment of liquid crystal molecules is sensitive to voltage changes.
Innovation Solution
Optimizing the flexoelectric coefficients of the liquid crystal layer, specifically setting the absolute value of e11 and e33 to be equal to or greater than 5 pC/m, to reduce the driving voltage while minimizing the impact on transmittance and flicker intensity, and adjusting the pixel electrode configuration to enhance viewing angle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high driving voltage is applied to achieve sufficient transmittance control in IPS-mode liquid crystal display panels, then the liquid crystal molecules can be effectively aligned and controlled, but power consumption increases and viewing angle performance deteriorates
Solution Approach 1:
The patent changes the physical parameters of the liquid crystal material by selecting compounds with specific flexoelectric coefficients (e11 and e33 both equal to or greater than 5 pC/m). This parameter change enables effective liquid crystal alignment and transmittance control at lower driving voltages, thereby reducing power consumption while maintaining display performance
2Illumination intensity
If high driving voltage is applied to control liquid crystal alignment, then sufficient transmittance modulation is achieved, but viewing angle performance is limited
Solution Approach 1:
The patent modifies the liquid crystal material parameters by incorporating compounds with high flexoelectric coefficients, which enables effective alignment control at lower voltages. This parameter optimization maintains wide viewing angle characteristics inherent to IPS-mode panels while achieving sufficient transmittance modulation
3Ease of manufacture
If conventional liquid crystal materials with lower flexoelectric coefficients are used, then manufacturing is easier and materials are more readily available, but higher driving voltages are required leading to increased power consumption
Solution Approach 1:
The patent specifies particular parameter ranges for liquid crystal compounds (flexoelectric coefficients e11 and e33 both ≥ 5 pC/m) that balance material availability with performance requirements. This parameter-based material selection enables lower driving voltages and reduced power consumption while maintaining ease of manufacture through established liquid crystal material synthesis and selection processes
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 approach effectively decreases the driving voltage of liquid crystal display panels while maintaining or improving luminance and reducing flicker intensity, thereby enhancing the overall display performance and energy efficiency.
Implementation Method 1
an absolute value of both flexoelectric coefficients e11 and e33 of the liquid crystal layer is equal to or greater than 5 pC/m
Data Source
AI summary
There is provided a liquid crystal display device capable of decreasing the driving voltage of a liquid crystal display panel. The liquid crystal display device includes: a first substrate and a second substrate; a liquid crystal layer interposed between the first substrate and the second substrate; and a pixel electrode and a common electrode arranged between the second substrate and the liquid crystal layer. Either one of the pixel electrode or the common electrode has an interdigital shape. An absolute value of both flexoelectric coefficients e11 and e33 of the liquid crystal layer is equal to or greater than 5 pC/m.