Liquid Crystal Display Alignment Film Pre-Tilt via Cross-Linked Polymer
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Solution Overview
Problem
Current liquid crystal display technologies face challenges in enhancing response characteristics without requiring large manufacturing equipment and in reducing the voltage needed to give pre-tilt to liquid crystal molecules, especially in multi-domain structures.
Innovation Solution
A liquid crystal display with alignment films containing cross-linked or deformed polymer compounds having cross-linkable or photo-sensitive functional groups, which provide pre-tilt to liquid crystal molecules through cross-linking or deformation, allowing for improved response speed and display characteristics without the need for large equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If light alignment film technique is used to give pre-tilt to liquid crystal molecules, then response characteristic is improved, but large type light irradiation apparatus is required and manufacturing process becomes complicated
Solution Approach 1:
The patent replaces the light irradiation system with an electric field system. Instead of using complex optical apparatus to form alignment films, the invention applies an electric field between pixel electrodes and counter electrode to give pre-tilt to liquid crystal molecules. This substitution of mechanical/optical system with an electrical field system resolves the contradiction by improving response characteristic while eliminating the need for large type light irradiation apparatus and complex manufacturing processes
Solution Approach 2:
The patent changes the method of giving pre-tilt from optical alignment film formation to electric field-induced molecular reorientation. By changing the physical parameter from light irradiation to voltage application, the invention achieves the same functional effect (pre-tilt) with a simpler system, thereby improving response characteristic without requiring complex manufacturing equipment
2Adaptability or versatility
If light alignment film technique is used to form multi-domain structure, then viewing angle is improved, but larger type apparatus is needed and manufacturing becomes more complicated
Solution Approach 1:
The patent divides each pixel into multiple domains by forming pixel electrodes with slit portions that create separate regions. Each domain is independently controlled by the electric field, allowing liquid crystal molecules to be oriented in different directions within the same pixel. This segmentation approach achieves wide viewing angle through multi-domain structure without requiring large type apparatus or complex light irradiation systems
Solution Approach 2:
The patent replaces the optical system required for forming multi-domain alignment films with an electric field system. By applying voltage between pixel electrodes and counter electrode, the invention creates multiple domains through electric field distribution patterns, achieving wide viewing angle without the need for complex optical apparatus
3Speed
If voltage is applied to give pre-tilt to liquid crystal molecules, then response characteristic is improved, but higher voltage requirement worsens power consumption
Solution Approach 1:
The patent applies a preliminary low voltage to give pre-tilt to liquid crystal molecules during the alignment film formation process. This preliminary action of molecular reorientation reduces the energy barrier for subsequent switching operations, allowing faster response characteristic to be achieved with lower driving voltage, thereby reducing power consumption while maintaining improved response speed
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 solution enhances response speed and maintains good display characteristics by giving pre-tilt to liquid crystal molecules using cross-linked or deformed compounds, reducing the voltage requirement and simplifying the manufacturing process, while maintaining reliability and precision in pixel formation.
Implementation Method 1
alignment films containing cross-linked or deformed polymer compounds having cross-linkable or photo-sensitive functional groups, which provide pre-tilt to liquid crystal molecules through cross-linking or deformation
Implementation Method 2
liquid crystal molecules having a negative dielectric anisotropy, i.e., a property such that the dielectric constant in the major axis direction of the liquid crystal molecule is lower than the dielectric constant in the minor axis direction
Data Source
AI summary
Disclosed herein is a liquid crystal display having a liquid crystal display element, the liquid crystal display element including: a pair of alignment films provided on mutually facing sides of a pair of substrates; and a liquid crystal layer which is provided between the pair of alignment films and contains a liquid crystal molecule having a negative dielectric anisotropy, wherein at least one of the pair of alignment films contains a cross-linked compound obtained by cross-linking a polymer compound having a cross-linkable functional group as a side chain, the liquid crystal layer further contains a molecule which has a ring structure and a spacer linking the ring structure, and the liquid crystal molecule is given a pre-tilt by the cross-linked compound.