LCD Pixel Electrode Oblique Edge Design for Viewing Angle and Transmittance
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Solution Overview
Problem
Liquid crystal displays (LCDs) face challenges in achieving high transmittance and response speed while maintaining a high aperture ratio, particularly in vertically aligned mode LCDs, due to the presence of cutouts and protrusions which affect the orientation of liquid crystal molecules and lead to light leakage and increased response time.
Innovation Solution
The design incorporates pixel electrodes with oblique edges featuring protruded and depressed portions, where the width of the protruded portion and the distance between adjacent edges satisfy the relation S+L≦2d, and the area of these portions is less than half of the pixel electrode area, with varying dimensions and orientations to optimize electric field distribution and liquid crystal orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cutouts and protrusions are provided in field generating electrodes to achieve wide viewing angle, then reference viewing angle is improved, but transmittance deteriorates due to reduced light transmission areas
Solution Approach 1:
The invention applies local quality by providing protrusions only at specific edge regions of the pixel electrode rather than uniformly across the entire electrode. This localized approach allows the edge regions to provide LC molecule tilt control for wide viewing angle, while the central region maintains large area for light transmission, thus resolving the contradiction between viewing angle and transmittance.
Solution Approach 2:
The invention segments the pixel electrode into different functional regions: protrusions are placed at edge regions to control LC orientation for viewing angle, while the central region remains flat and uninterrupted to maximize light transmission. This spatial segmentation allows simultaneous optimization of both viewing angle and transmittance.
2Area of stationary object
If pixel electrode size is increased to achieve high aperture ratio, then aperture ratio is improved, but response time deteriorates due to reduced electric field effect on central LC molecules
Solution Approach 1:
The invention segments the pixel electrode into edge regions with protrusions and central regions without protrusions. The protrusions at the edges create localized electric field enhancements that propagate into the central region, ensuring uniform LC response across the entire large-area pixel electrode, thus maintaining fast response time while achieving high aperture ratio.
Solution Approach 2:
The invention applies local quality by concentrating the LC orientation control function at the edge regions with protrusions, while the central region benefits from the propagated electric field effect. This allows the central region to maintain uniform LC alignment without requiring direct electric field application, resolving the response time issue in large-area pixels.
3Adaptability or versatility
If multiple cutouts and protrusions are added to distribute LC tilt directions, then reference viewing angle is improved, but transmittance deteriorates due to increased blocking of light paths
Solution Approach 1:
The invention applies local quality by concentrating the LC tilt control function at the edge regions with protrusions, while the central region remains uninterrupted for light transmission. This localized approach achieves wide viewing angle through edge-provided tilt directions without requiring multiple cutouts across the electrode, thus maintaining high transmittance.
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 the transmittance and response speed of LCDs by improving the uniformity of liquid crystal molecule orientation, reducing light leakage, and increasing the aperture ratio, thus providing better display performance.
Implementation Method 1
applying voltages to the field-generating electrodes to generate an electric field in the LC layer that determines the orientations of LC molecules therein to adjust polarization of incident light
Implementation Method 2
a vertically aligned mode LCD, which aligns the major axes of the LC molecules perpendicular to the upper and lower panels in the absence of an electric field
Data Source
AI summary
A liquid crystal display includes a substrate, a plurality of pixel electrodes formed on the substrate, a common electrode facing the pixel electrodes, and a liquid crystal layer interposed between the pixel electrodes and the common electrode. The pixel electrode includes at least one oblique edge including a plurality of protruded and depressed portions.