Liquid Crystal Material Parameter Optimization for LCD Transmittance
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Solution Overview
Problem
The increasing complexity of pixel structures in LCDs leads to a decrease in liquid crystal transmittance due to a smaller effective electrical field, impacting the optical performance of polymer sustained alignment (PSA) LCDs.
Innovation Solution
A liquid crystal material with specific properties, including dielectric anisotropy (Δ∈) ranging from -2.5 to -5, splay elastic constant (K11) from 1.1×10−11 to 1.6×10−11 N, bend elastic constant (K33) from 1.1×10−11 to 1.6×10−11 N, and a relationship K11+K3310×Δɛ<1.28×10-12, is used in combination with a polymerizable monomer to enhance transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pixel structures are made increasingly complicated to achieve multi-domain functionality, then the functional versatility of LCDs is improved, but the liquid crystal transmittance decreases due to smaller effective electrical field
Solution Approach 1:
The patent changes the physical parameters of the liquid crystal material, specifically selecting materials with particular elastic constants (K11, K33) and dielectric anisotropy (Δ∈) values that satisfy a specific relationship. This parameter optimization enables improved transmittance performance in complex multi-domain pixel structures where the effective electrical field is reduced.
2Device complexity
If the effective electrical field is reduced in complex pixel structures, then the device complexity is managed, but the transmittance of liquid crystal material decreases
Solution Approach 1:
The patent addresses this contradiction by optimizing the liquid crystal material parameters (K11, K33, Δ∈) to satisfy a specific mathematical relationship. This allows the material to maintain high transmittance performance even when the effective electrical field is reduced due to complex pixel structures, thereby decoupling the trade-off between device complexity and optical performance.
3Use of energy by moving object
If driving voltage is reduced to lower power consumption, then energy efficiency is improved, but transmittance performance deteriorates
Solution Approach 1:
The patent enables low-voltage operation with maintained transmittance by optimizing the liquid crystal material's elastic constants and dielectric anisotropy. The specific parameter relationship (K11+K33)/10×Δ∈<1.28×10-12 allows the material to respond effectively to lower driving voltages, breaking the conventional trade-off between power consumption and transmittance performance.
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 selected liquid crystal material improves the optical performance of LCDs by increasing transmittance, particularly when used in PSA LCDs, even at lower driving voltages, by optimizing the parameters K11, K33, and Δ∈.
Implementation Method 1
a dielectric anisotropy (Δ∈) ranging from about −2.5 to about −5
Implementation Method 2
add a polymerizable monomer into the liquid crystal material. Once polymerized, the polymerized monomer gives the liquid crystal molecules a pretilt angle
Data Source
AI summary
A liquid crystal is provided, which can be used in a liquid crystal display (LCD) to provide an LCD exhibiting a good transmittance. The liquid crystal according to the invention has the following properties:(i) a dielectric anisotropy (Δ∈) ranging from about −2.5 to about −5;(ii) a splay elastic constant (K11) ranging from about 1.1×10−11 N to about 1.6×10−11 N;(iii) a bend elastic constant (K33) ranging from about 1.1×10−11 N to about 1.6×10−11 N; and(iv) Δ∈, K11 (N) and K33 (N) conforming to the following equation:K11+K3310×Δɛ<1.28×10-12.A liquid crystal material combination is also provided which comprises the liquid crystal according to the invention above mentioned and a polymerizable monomer.