Array Substrate Slit Patterns for LCD Viewing Angles
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Solution Overview
Problem
Liquid crystal display (LCD) devices with multi-domain structures suffer from a reduced aperture ratio due to the increased number of switching elements, data lines, and gate lines, leading to degraded image quality and limited viewing angles.
Innovation Solution
An array substrate with a pixel electrode featuring sub-pixel electrodes and slit patterns connected to a switching element, allowing for a higher number of domains and improved viewing angles without increasing the number of switching elements or lines, achieved through a specific arrangement of slit patterns and electrode bars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pixel electrode is divided into sub-pixel electrodes to increase the number of domains in a multi-domain structure, then the viewing angle is improved, but the aperture ratio of the unit pixel substantially decreases
Solution Approach 1:
The pixel electrode is divided into first and second sub-pixel electrodes with different slit patterns, creating multiple domains within a unit pixel. This segmentation allows different viewing angle characteristics in different domains while maintaining a reasonable aperture ratio by sharing switching elements and lines among the domains.
Solution Approach 2:
A single switching element controls multiple sub-pixel electrodes through time-division multiplexing, and a single data line serves multiple sub-pixel electrodes. This multi-functionality reduces the number of switching elements and lines required, thereby preventing substantial degradation of the aperture ratio while still achieving multi-domain structure for improved viewing angle.
2Adaptability or versatility
If the number of switching elements, data lines and gate lines is increased to achieve four or more domains per unit pixel, then the viewing angle is improved, but the device complexity substantially increases
Solution Approach 1:
Multiple sub-pixel electrodes are electrically connected to a single switching element, and multiple sub-pixel electrodes share common data lines and gate lines. This merging reduces the total number of switching elements and lines required to achieve four or more domains per unit pixel, thereby controlling device complexity while maintaining multi-domain functionality for improved viewing angle.
Solution Approach 2:
The pixel voltages applied to sub-pixel electrodes vary periodically with different levels during a frame period, enabling charge-sharing driving method. This periodic action allows a single switching element to control multiple sub-pixel electrodes over time, reducing the number of switching elements and lines needed while achieving multi-domain structure.
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
The solution enhances the aperture ratio and viewing angles of LCD devices by increasing the number of domains per pixel unit, resulting in improved display quality with wider viewing angles without additional components.
Implementation Method 1
When an electric field is applied to the liquid crystal layer, an arrangement of liquid crystal molecules in the liquid crystal layer is altered. As a result, an optical transmissivity of light through the liquid crystal layer is controlled
Implementation Method 2
a liquid crystal layer interposed therebetween. When an electric field is applied to the liquid crystal layer, an arrangement of liquid crystal molecules in the liquid crystal layer is altered
Data Source
AI summary
An array substrate includes a base substrate, a gate line, a data line, a switching element and a pixel electrode. The gate line extends in a first direction on the base substrate. The data line extends in a second direction, substantially perpendicular to the first direction, on the base substrate. The switching element is electrically connected to the gate line and the data line. The pixel electrode includes a first sub-pixel electrode having first slit patterns formed thereon, and a second sub-pixel adjacent to the first sub-pixel electrode and having second slit patterns formed thereon. The first slit patterns and the second slit patterns are electrically connected to the switching element, the first slit patterns are disposed in parallel with each other in a third direction, and the second slit patterns are disposed in parallel with each other in a fourth direction different than third direction.