Cross-Type Pixel Electrode for Liquid Crystal Domain Control
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Solution Overview
Problem
Liquid crystal display devices in the patterned vertical alignment (PVA) mode face limitations in viewing angle due to the inability to effectively control the orientation of liquid crystal molecules across different viewing angles.
Innovation Solution
A display device with a linear polarization structure is developed, featuring a first substrate with a domain forming layer and a pixel electrode having a cross-type opening pattern, and a second substrate with a common electrode, where a liquid crystal layer including reactive mesogens is formed between the substrates, allowing for the linear polarization of light and improved liquid crystal domain formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional PVA mode liquid crystal display device is used, then the liquid crystal molecules can be arranged in different directions using a patterned transparent electrode, but the viewing angle remains limited due to inability to effectively control orientation across different viewing angles
Solution Approach 1:
The pixel electrode is divided into multiple independent segments arranged in a matrix pattern, with each segment capable of independently controlling liquid crystal molecule orientation in its specific region. This segmentation allows different viewing angles to have optimized local orientation control, resolving the contradiction between viewing angle improvement and orientation control capability.
Solution Approach 2:
Different regions of the pixel electrode are designed with different segment configurations and orientations, allowing each local region to optimize liquid crystal alignment for specific viewing directions. This local quality variation enables effective orientation control across different viewing angles simultaneously.
2Illumination intensity
If a cross type opening pattern is used to form liquid crystal domains, then the viewing angle is improved through linear polarization structure, but the manufacturing precision requirements increase
Solution Approach 1:
Alignment layers are pre-formed on the substrate before pixel electrode deposition, establishing predetermined orientation guides that direct liquid crystal molecule alignment. This preliminary action reduces the precision requirements for subsequent cross type opening pattern fabrication, as the alignment framework is already in place to guide the overall structure.
3Stability of the object's composition
If reactive mesogen is used to fix liquid crystal molecules and produce liquid crystal domains, then the arrangement stability is improved, but the manufacturing process complexity increases
Solution Approach 1:
The liquid crystal material composition is changed by incorporating reactive mesogen with specific chemical properties that enable photo-crosslinking. This parameter change in material composition provides permanent molecular fixation and enhanced arrangement stability, while the added manufacturing steps are offset by the elimination of complex alignment control procedures during operation.
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 the viewing angle and aperture ratio of the display device, simplifies manufacturing processes, and stabilizes the arrangement of liquid crystal molecules, resulting in improved reliability and productivity.
Implementation Method 1
The liquid crystal layer may be arranged to linearly polarize light emitted from the display device
Implementation Method 2
forming a liquid crystal layer by irradiating light on liquid crystal molecules and reactive mesogen monomers disposed between the first and second substrates
Data Source
AI summary
A display device having an improved viewing angle by using a linear polarization structure, and a method of manufacturing the same. The display device includes a first substrate arrangement including a domain forming layer and a pixel electrode arranged on the domain forming layer, the pixel electrode having a cross type opening pattern, a second substrate arrangement including a common electrode arranged on an entire surface that faces the first substrate arrangement and a liquid crystal layer arranged between the first substrate arrangement and the second substrate arrangement, the liquid crystal layer including a plurality of liquid crystal molecules and a reactive mesogen to fix liquid crystal molecules and to produce a liquid crystal domain based on the cross type opening pattern.