Liquid Crystal Display Capacitance Ratio Optimization
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Solution Overview
Problem
In liquid crystal display apparatuses using the Fringe Field Switching (FFS) mode, the drive voltage tends to be high, and the response time is not optimized, especially when employing negative liquid crystal materials, which complicates the synthesis of low-viscosity materials and increases the risk of reverse domain formation.
Innovation Solution
The liquid crystal display apparatus is designed with a specific ratio of liquid crystal capacitance to alignment film capacitance, set to be equal to or smaller than a predetermined value, utilizing negative liquid crystal materials with a dielectric constant that allows for a lower drive voltage and faster response time by optimizing the alignment of liquid crystal molecules and electric field distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If negative liquid crystal materials are employed in FFS mode, then the response time can be improved, but the drive voltage becomes high and the synthesis of low-viscosity materials becomes complicated
Solution Approach 1:
The patent changes the dielectric constant parameter of the liquid crystal material to a specific range (ε3: 4.0 to 7.0) to optimize the balance between response time and drive voltage. By adjusting this physical parameter, the invention achieves fast response characteristics while maintaining manageable drive voltage levels.
Solution Approach 2:
The invention uses composite liquid crystal material formulations that combine multiple components to achieve the target dielectric constant range. This composite approach allows optimization of viscosity and response time while controlling the drive voltage requirement, resolving the contradiction between speed and energy consumption.
2Speed
If negative liquid crystal materials are employed in FFS mode, then the response time can be improved, but the risk of reverse domain formation increases
Solution Approach 1:
The patent adjusts the dielectric constant parameter ε3 to a specific range (4.0 to 7.0) to control the electric field distribution and reduce the risk of reverse domain formation. This parameter optimization ensures that the liquid crystal molecules switch uniformly without forming reverse domains, even with fast response materials.
3Use of energy by moving object
If the liquid crystal capacitance to alignment film capacitance ratio is increased, then the drive voltage decreases, but the response time increases and reverse domain formation risk increases
Solution Approach 1:
The patent optimizes the capacitance ratio parameter (C_LC/C_PI) to a specific range (0.03 to 0.08) to achieve the optimal balance between drive voltage and response time. This precise parameter control ensures that the drive voltage is reduced without sacrificing response speed or increasing reverse domain formation risk.
4Use of energy by moving object
If the liquid crystal capacitance to alignment film capacitance ratio is increased, then the drive voltage decreases, but the synthesis complexity and reverse domain risk increase
Solution Approach 1:
The patent sets the capacitance ratio C_LC/C_PI to a specific range (0.03 to 0.08) to achieve optimal drive voltage reduction while maintaining reliability. This parameter optimization ensures that the electric field distribution remains uniform, preventing reverse domain formation even at lower drive voltages.
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 results in a lower drive voltage and shorter response time, while minimizing the occurrence of reverse domains and maintaining high display quality by ensuring a sharp electric field gradient and uniform modulation factor across the liquid crystal layer.
Implementation Method 1
formed of a negative liquid crystal material... a dielectric constant that allows for a lower drive voltage and faster response time by optimizing the alignment of liquid crystal molecules and electric field distribution
Implementation Method 2
a first alignment film covering the insulating film and the pixel electrodes... optimizing the alignment of liquid crystal molecules and electric field distribution
Data Source
AI summary
According to one embodiment, a liquid crystal display apparatus includes an array substrate, a counter-substrate and a liquid crystal layer formed of a negative liquid crystal material. The array substrate includes a common electrode, an insulating film, a plurality of pixel electrodes each provided with a slit, and a first alignment film. A ratio of a liquid crystal capacitance to a capacitance of the first alignment film (liquid crystal capacitance/alignment film capacitance) is equal to or smaller than a predetermined value. The formula (es/d_LC)/(e_PI/d_PI)≦0.0599 is satisfied.