Oblique Edge Pixel Electrodes for Wide Viewing Angle LCDs
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Solution Overview
Problem
Vertical alignment (VA) mode liquid crystal display (LCD) faces challenges in maintaining high contrast and wide viewing angles while minimizing the impact of protrusions and cutouts on the electric field, which affects the aperture ratio and response time of the LC layer.
Innovation Solution
The design incorporates a substrate with specific electrode configurations, including oblique edges and cutouts in the pixel electrodes and common electrodes, which determine tilt directions of liquid crystal molecules and partition the electrodes into sub-areas to optimize the electric field distribution and viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If larger protrusions or larger cutouts are used to determine LC molecule tilt directions, then the viewing angle is widened, but the aperture ratio decreases
Solution Approach 1:
The pixel electrode is divided into multiple sub-regions by the cutouts, with each sub-region having edges that determine LC molecule tilt directions. This segmentation allows multiple tilt directions to be achieved without requiring large protrusions or cutouts, thus maintaining a high aperture ratio while achieving wide viewing angles.
2Area of stationary object
If protrusions or cutouts are kept farther apart to increase aperture ratio, then the aperture ratio increases, but the availability of protrusions or cutouts diminishes and electric field disturbance increases, elongating response time
Solution Approach 1:
The invention utilizes the edge portions of the pixel electrode in a new dimension - by creating oblique edges at specific angles through cutouts, the edges themselves become the tilt direction determining elements. This approach allows multiple tilt directions to be achieved using the electrode edges rather than relying on spaced protrusions, maintaining both high aperture ratio and fast response time.
3Illumination intensity
If voltage is raised to enhance electric field and increase luminance, then luminance increases, but the electric field generated between data lines and pixel electrodes increases, disordering LC molecule orientations near edges and increasing response time
Solution Approach 1:
The pixel electrode is designed with different edge characteristics in different regions - oblique edges at specific angles in certain sub-regions and other edge configurations in adjacent regions. This local differentiation allows LC molecules in different areas to have controlled tilt directions, reducing electric field disordering effects and improving response time while maintaining luminance.
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 viewing angles and response time of the LCD by controlling the electric field and maintaining a high aperture ratio, thereby improving the overall display performance.
Implementation Method 1
The LCD displays images by applying voltages to the field-generating electrodes to generate an electric field in the LC layer, which determines orientations of LC molecules in the LC layer to adjust polarization of incident light
Data Source
AI summary
A thin film transistor array panel for a liquid crystal display, a liquid crystal display and a manufacturing method thereof are provided. The display panel includes: a substrate; and a first electrode portion disposed on the substrate, the first electrode portion having two pairs of main edges facing each other and a first cutout oblique to the main edges, wherein the main edges include first and second edges, the first electrode portion has an oblique edge substantially parallel to the first cutout, the oblique connecting the first edge and the second edge, the first edge includes a first portion extending from the oblique edge to an end of the first cutout, and the oblique edge is substantially equal to or longer than a half of the first portion of the first edge.