Liquid Crystal Display Device with Optimized Alignment Angle
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Solution Overview
Problem
In liquid crystal display devices using negative-type liquid crystals, there are challenges with response speed during intermediate gradation display and sensitivity to alignment film thickness, leading to non-uniform luminance and potential reverse domain issues.
Innovation Solution
Setting the bias angle of liquid crystal molecules between 10° to 45° to the direction perpendicular to the slit or electrode extensions helps improve response speed and suppresses non-uniformity in luminance and reverse domain occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If liquid crystal display devices use negative-type liquid crystals with conventional alignment, then the device structure is simple, but the response speed during intermediate gradation display is slow
Solution Approach 1:
The patent applies parameter changes by setting the initial alignment direction of liquid crystal molecules at a specific angle (10° to 45°) relative to the substrate normal projection direction. This angular parameter optimization enables faster response speed during intermediate gradation display while maintaining the simplicity of the negative-type liquid crystal structure.
2Manufacturing precision
If conventional alignment is used in negative-type liquid crystal display devices, then manufacturing is easier, but the device shows high sensitivity to alignment film thickness variations
Solution Approach 1:
The patent changes the alignment angle parameter to reduce sensitivity to alignment film thickness variations. By setting the initial alignment direction at 10° to 45° relative to the substrate normal projection direction, the device achieves better luminance uniformity and reduced reverse domain occurrence even with variations in alignment film thickness, thereby improving manufacturing precision without significantly increasing manufacturing complexity.
3Reliability
If negative-type liquid crystals are used, then the liquid crystal layer has fast response characteristics, but non-uniform luminance and reverse domain issues occur
Solution Approach 1:
The patent addresses harmful factors by optimizing the alignment angle parameter. Setting the initial alignment direction at 10° to 45° relative to the substrate normal projection direction reduces the occurrence of reverse domains and non-uniform luminance in negative-type liquid crystal display devices, thereby improving overall display quality and reliability while preserving the fast response characteristics.
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 enhances response speed during intermediate gradation display and reduces sensitivity to alignment film thickness, maintaining display quality and preventing non-uniformity in luminance.
Implementation Method 1
the liquid crystal layer includes liquid crystal molecules which are initially aligned at an angle of 10° to 45° to a direction which is perpendicular to a direction of extension of the slit
Implementation Method 2
liquid crystal molecules are switched by a lateral electric field which is substantially parallel to a major surface of the array substrate
Data Source
AI summary
According to one embodiment, a liquid crystal display device includes an array substrate including a common electrode, an insulation film disposed on the common electrode, and a pixel electrode disposed on the insulation film, opposed to the common electrode and provided with a slit, a counter-substrate disposed to be opposed to the array substrate, and a liquid crystal layer formed of a negative-type liquid crystal material held between the array substrate and the counter-substrate, wherein the liquid crystal layer includes liquid crystal molecules which are initially aligned at an angle of 10° to 45° to a direction which is perpendicular to a direction of extension of the slit.