Liquid Crystal Display Microcavity Partitioning for Visibility
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) face limitations in achieving diverse liquid crystal molecule orientations and dielectric constants within a single pixel area, leading to uniform voltage-transmittance curves and reduced display visibility.
Innovation Solution
The implementation of a liquid crystal display with a microcavity partitioned by a partition wall, allowing for the injection of different liquid crystal materials with varying dielectric constants into separate areas, and the use of a common electrode and roof layer configuration to generate distinct electric field inclinations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single uniform liquid crystal material is used in the pixel area, then the manufacturing process is simple, but the display visibility is reduced due to uniform voltage-transmittance curves
Solution Approach 1:
The pixel area is divided into multiple sub-areas (first area and second area) by a partition wall, allowing different liquid crystal materials to be injected into each sub-area. This segmentation enables diverse voltage-transmittance curves across the pixel, improving display visibility while maintaining a relatively simple manufacturing process using existing injection techniques
Solution Approach 2:
Different liquid crystal materials with different dielectric constants are introduced into different sub-areas of the pixel. Each local area has optimized liquid crystal properties tailored to its specific function, creating non-uniform voltage-transmittance characteristics that enhance overall display visibility
2Illumination intensity
If different liquid crystal materials are injected into different areas, then diverse voltage-transmittance curves are achieved, but the device complexity increases due to partition walls and multiple injection processes
Solution Approach 1:
The microcavity is segmented into multiple sub-areas using a partition wall, which is formed by removing part of the sacrificial layer. This segmentation structure enables the introduction of different liquid crystal materials into different areas, creating diverse voltage-transmittance curves that improve display visibility
Solution Approach 2:
A sacrificial layer is formed beforehand in the microcavity structure, and specific portions are removed to create partition walls before liquid crystal injection. This preliminary action simplifies the subsequent injection process by pre-defining the areas where different liquid crystal materials will be injected
3Illumination intensity
If different liquid crystal materials with different dielectric constants are used, then non-uniform voltage-transmittance curves are created, but the manufacturing precision requirements increase
Solution Approach 1:
The partition wall is formed in advance by selectively removing portions of the sacrificial layer before liquid crystal injection. This preliminary structuring creates well-defined boundaries and separate compartments, making it easier to control the injection of different liquid crystal materials into specific areas without requiring extremely high injection precision
Solution Approach 2:
The partition wall acts as an intermediary structure that physically separates different liquid crystal materials within the microcavity. This intermediary structure prevents mixing of different liquid crystal materials and simplifies the injection process by providing clear boundaries for material placement
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 enhances display visibility by creating non-uniform voltage-transmittance curves across different areas of the same pixel, improving luminance and display characteristics.
Implementation Method 1
When an electric field is applied to the liquid crystal layer, degrees of inclination of the liquid crystal molecule in the first area and the second area may be different from each other
Implementation Method 2
The liquid crystal molecules injected into the first area and the second area may respectively have different dielectric constants
Data Source
AI summary
A liquid crystal display includes a thin film transistor on a substrate, a pixel electrode connected to a first terminal of the thin film transistor, a roof layer above the pixel electrode, a microcavity between the pixel electrode and the roof layer, the microcavity including a liquid crystal injection hole, a partition wall in the microcavity, the partition wall partitioning the microcavity into a first area and a second area, and a liquid crystal layer with liquid crystal molecules in the microcavity, the liquid crystal molecules in the first area being a different type than the liquid crystal molecules in the second area.