Liquid Crystal Display Bend Configuration Stabilization
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Solution Overview
Problem
Active matrix liquid crystal displays using π cell or OCB modes require an initial transition process from splay to bend configuration, which is slow and hinders high image quality, and when employing a technique that eliminates this transition, display unevenness occurs.
Innovation Solution
A liquid crystal display with an array and counter substrate, a liquid crystal layer containing high-molecular weight and low-molecular weight materials, where the low-molecular weight material forms a bend configuration before energizing, and specific voltage control inequalities are applied to prevent initial transition and reduce display unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an initial transition process from splay to bend configuration is performed, then the liquid crystal display can achieve proper bend configuration, but the response time increases significantly (requiring several seconds to minutes)
Solution Approach 1:
The alignment layer is pre-treated with a specific surface treatment to create a pretilt angle that promotes bend configuration. This preliminary preparation eliminates the need for the slow initial transition process from splay to bend configuration, allowing the liquid crystal display to achieve proper bend configuration immediately upon energization.
2Loss of time
If the technique of T. Konno et al. is used to eliminate initial transition process, then response speed improves, but display unevenness occurs
Solution Approach 1:
The alignment layer is treated with a specific surface treatment only in certain regions or with specific characteristics to create local variations in pretilt angle. This local quality approach allows different regions of the liquid crystal display to have optimized properties, achieving both fast response and uniform display by controlling the pretilt angle distribution.
3Stability of the object's composition
If high-molecular weight material is used alone, then the liquid crystal layer has good stability, but the bend configuration forms slowly
Solution Approach 1:
The liquid crystal layer uses a composite material system combining high-molecular weight material with low-molecular weight liquid crystal material. The high-molecular weight material provides stability and maintains bend configuration, while the low-molecular weight material enhances the speed of configuration formation and response, achieving both stability and fast response simultaneously.
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 allows for a liquid crystal display that initializes without the need for a slow transition process, maintaining image quality and preventing display unevenness, with the low-molecular weight material forming a bend configuration before energizing and satisfying specific voltage control inequalities.
Implementation Method 1
the low-molecular weight liquid crystal material forming a bend configuration before energizing the display
Implementation Method 2
a polymer network is formed by irradiating the mixture with ultraviolet light
Data Source
AI summary
A liquid crystal display includes an array substrate which includes scanning lines, signal lines, pixel circuits each including a pixel switch and a pixel electrode, a first circuit switching a state of the scanning lines between a first state that they are electrically connected to one another and a second state that they are electrically disconnected from one another, and a second circuit switching a state of the signal lines between a third state that they are electrically connected to one another and a fourth state that they are electrically disconnected from one another, a counter substrate which includes a counter electrode, and a liquid crystal layer which is interposed between the array and counter substrates and contains a high-molecular weight material and a low-molecular weight liquid crystal material, the low-molecular weight liquid crystal material forming a bend configuration before energizing the display.