Cross-Shaped Organic Protrusion for LCD Viewing Angle and Response Speed
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Solution Overview
Problem
Liquid crystal displays (LCDs) face challenges in maintaining a wide viewing angle and fast response speed while preserving the aperture ratio and transmittance, particularly due to the limitations of micro-slits in pixel electrodes and common electrodes which can lead to misalignment and reduced aperture ratio.
Innovation Solution
The implementation of a cross-shaped organic layer protrusion on either the first or second substrate, overlapping the pixel electrode, which directs the pretilt of liquid crystal molecules in different directions, thereby enhancing the viewing angle and response speed without reducing the aperture ratio, and eliminating the need for micro-slits in the pixel or common electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If micro-slits are formed in pixel electrodes or common electrodes to improve viewing angle and response speed, then viewing angle and response speed are improved, but aperture ratio and transmittance decrease
Solution Approach 1:
A cross-shaped organic layer protrusion is introduced as an intermediary element between the pixel electrode and common electrode. This protrusion extends from the pixel electrode toward the common electrode, creating a fringe electric field that accelerates liquid crystal response without requiring micro-slits. The protrusion serves as a mediator that generates the necessary electric field distortion to improve response speed while preserving the continuous structure of both electrodes, thereby maintaining aperture ratio and transmittance.
2Adaptability or versatility
If micro-slits are formed in pixel electrodes or common electrodes to improve viewing angle, then viewing angle is improved, but aperture ratio and transmittance decrease
Solution Approach 1:
The cross-shaped organic layer protrusion acts as an intermediary structure that modifies the electric field distribution to achieve wide viewing angle characteristics. By extending the protrusion in a cross pattern, the fringe electric field is generated in multiple directions, enabling the liquid crystal molecules to align properly for viewing from various angles. This approach achieves the viewing angle improvement normally associated with micro-slits without creating openings in the electrodes, thus preserving aperture ratio and transmittance.
3Manufacturing precision
If micro-slits are formed in pixel electrodes or common electrodes, then alignment of liquid crystal molecules is improved, but production yield decreases due to misalignment
Solution Approach 1:
The cross-shaped organic layer protrusion serves as a robust intermediary structure that is easier to manufacture and align than micro-slits. The protrusion can be formed using standard photolithography and deposition processes, and its position and orientation can be precisely controlled through mask alignment. This intermediary structure provides clear geometric features that guide liquid crystal molecule alignment without requiring the precise alignment of micro-slits between two separate electrodes, thereby improving production yield while maintaining alignment quality.
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 increases the viewing angle and response speed of the LCD while maintaining or improving the aperture ratio and transmittance, reducing production yield losses associated with misalignment issues in conventional slit-based designs.
Implementation Method 1
voltages are applied to the field generating electrodes so as to generate an electric field over the liquid crystal layer, and then the alignment of liquid crystal molecules of the liquid crystal layer is determined by the electric field
Implementation Method 2
a vertical alignment ('VA') mode LCD, which aligns LC molecules such that long axes thereof are perpendicular to the display panels in the absence of an electric field
Data Source
AI summary
A liquid crystal display includes: a first substrate; a pixel electrode on the first substrate; a second substrate which faces the first substrate; a common electrode on the second substrate; a liquid crystal layer between the first substrate and the second substrate; and a cross-shaped organic layer protrusion on the first substrate or the second substrate and overlapping the pixel electrode. The edge of the organic layer protrusion is protruded from the edge of the pixel electrode.