Domain-Forming Layer Depression Pattern for LCD Viewing Angle
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Solution Overview
Problem
The manufacturing process of patterned vertical alignment (PVA) mode liquid crystal display (LCD) devices is complex due to the need for patterning transmissive electrodes and forming protrusions, which reduces aperture ratio and increases misalignment risks during substrate assembly, affecting display quality and efficiency.
Innovation Solution
A display device comprising a first substrate with a domain-forming layer and a pixel electrode, and a second substrate with a common electrode, where a liquid crystal layer including reactive mesogens is used to form and fix liquid crystal domains without separate patterning on the common electrode, simplifying the manufacturing process and enhancing viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a process of patterning a transmissive electrode and/or forming a protrusion is performed to form a liquid crystal domain, then the viewing angle is enhanced, but the number of manufacturing steps increases and the aperture ratio is reduced
Solution Approach 1:
The invention extracts the domain formation function from the electrode structure and transfers it to the liquid crystal layer itself. By removing the need for patterned electrodes or substrate protrusions, the patent eliminates complex manufacturing steps while maintaining the liquid crystal domain formation capability that enhances viewing angle.
Solution Approach 2:
The invention changes the physical-chemical parameters of the liquid crystal layer by introducing reactive mesogen monomers with specific molecular structures and ratios. This parameter change enables the liquid crystal material to self-form domains without requiring structural modifications to electrodes or substrates, thereby simplifying manufacturing while achieving enhanced viewing angles.
2Illumination intensity
If a process of patterning a transmissive electrode and/or forming a protrusion is performed to form a liquid crystal domain, then the viewing angle is enhanced, but the aperture ratio is reduced
Solution Approach 1:
The invention removes the need for physical structures (patterned electrodes or protrusions) that occupy space and reduce aperture ratio. By extracting the domain formation function from solid structures and implementing it through liquid crystal material properties, the full pixel area becomes available for light transmission while maintaining domain formation capability.
3Reliability
If separate processes for patterning and protrusion formation are performed, then liquid crystal domains are formed, but misalignment occurs during substrate assembly
Solution Approach 1:
The invention merges the domain formation process with the liquid crystal layer formation process itself. By combining these functions into a single material system, the patent eliminates the need for separate patterning and protrusion formation processes, thereby removing the sources of misalignment that occur during multi-step manufacturing and substrate assembly.
Solution Approach 2:
The liquid crystal composition with reactive mesogen monomers performs self-service by automatically forming domains based on its inherent molecular properties and response to electric fields. This self-organizing capability eliminates the need for external patterning structures and reduces sensitivity to alignment precision during manufacturing.
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 approach simplifies the manufacturing process, enhances the aperture ratio and viewing angles of LCD devices, and reduces misalignment issues, leading to improved display quality and efficiency.
Implementation Method 1
The liquid crystal layer comprises a reactive mesogen (RM) to fix liquid crystal molecules forming a liquid crystal domain
Data Source
AI summary
A display device may include a first substrate, a second substrate, and a liquid crystal layer. The first substrate may include a domain-forming layer including a depression pattern for forming a liquid crystal domain in a pixel area and a pixel electrode formed on the domain-forming layer. The second substrate may face the first substrate. The second substrate may include a common electrode formed on the entire surface thereof. The liquid crystal layer may be disposed between the first substrate and the second substrate. The liquid crystal layer may include a reactive mesogen (RM) which fixes liquid crystal molecules formed in the liquid crystal domain. Since a liquid crystal domain may be formed without a separate pattern on a common electrode, a display device having an enhanced aperture ratio and an enhanced viewing angle may be manufactured.