VA LCD Electrode Slit Layout for Wide Viewing and Transmittance
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Solution Overview
Problem
VA mode liquid crystal display devices face issues of reduced opening ratio, transmittance, and brightness due to wires connecting multiple domains, leading to wash-out and image quality deterioration when liquid crystal rotation deviates from a preset range.
Innovation Solution
The display device incorporates a sub pixel electrode with pixel slits and a common electrode with common slits, where the widths on the center lines are greater than on the outer lines, and are misaligned, with symmetrical arrangements of split pixel and common electrodes, enhancing electric field strength and aligning liquid crystals at various rotation angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple domains with different alignment directions are implemented in one pixel, then viewing angle is improved, but opening ratio is reduced due to wires connected to multiple domains
Solution Approach 1:
The pixel electrode is divided into multiple domains (first domain and second domain) with different alignment directions. Each domain has pixel slits that are narrower at the outer line and wider at the center line, creating a tapered shape. This segmentation allows different liquid crystal alignment directions in each domain while maintaining a larger effective opening ratio by reducing the impact of connection wires.
Solution Approach 2:
The pixel slits have non-uniform width distribution within each domain, being narrower at the outer line and wider at the center line. This local variation in slit width optimizes the electric field distribution and liquid crystal alignment in different regions of the pixel, improving viewing angle while maintaining adequate opening ratio.
2Adaptability or versatility
If multiple domains with different alignment directions are implemented, then viewing angle is improved, but transmittance and brightness are reduced due to reduced opening ratio
Solution Approach 1:
By segmenting the pixel into multiple domains with optimized slit configurations, the patent maintains adequate opening ratio in each domain while achieving wide viewing angle. The tapered slit design reduces the overall wire coverage, thereby improving light transmittance and brightness.
Solution Approach 2:
The patent changes the geometric parameters of the pixel slits, specifically making them narrower at the outer line and wider at the center line. This parameter variation optimizes the balance between opening ratio and viewing angle, preventing brightness reduction while maintaining wide viewing capability.
3Manufacturing precision
If liquid crystal rotation direction is controlled within a preset range, then image quality is maintained, but adaptability to different viewing angles is limited
Solution Approach 1:
The pixel is segmented into multiple domains, each with pixel slits having specific orientation and tapered dimensions. This segmentation enables precise control of liquid crystal alignment in each domain while the collective arrangement of domains provides adaptability to different viewing angles, overcoming the limitation of single-domain designs.
Solution Approach 2:
The pixel slits are designed with asymmetric width distribution (narrower at outer line, wider at center line) and specific orientations in each domain. This asymmetric design enables precise control of liquid crystal rotation direction while maintaining adaptability to various viewing angles through the coordinated arrangement of asymmetric slit patterns across multiple domains.
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 improves image display quality and user satisfaction by maintaining transmittance and providing uniform viewing angles in multiple directions, addressing the limitations of existing VA mode liquid crystal display devices.
Implementation Method 1
The liquid crystal display device displays images by applying a voltage to the electrodes of the two substrates to generate an electric field and setting an alignment of liquid crystal molecules through the electric field to control polarization of incident light
Implementation Method 2
The liquid crystal display device displays images by applying a voltage to the electrodes of the two substrates to generate an electric field and setting an alignment of liquid crystal molecules through the electric field to control polarization of incident light
Implementation Method 3
The sub pixel electrode has at least one pixel slit of which a width on a center line of the sub pixel electrode is greater than a width on an outer line of the sub pixel electrode... enhancing electric field strength and aligning liquid crystals at various rotation angles
Data Source
AI summary
Disclosed herein is a display device including a sub pixel electrode having, in each do main, at least one pixel slit of which a width on a center line of the sub pixel electrode is greater than a width on an outer line of the sub pixel electrode, for each domain, and a common electrode having, in each domain, at least one common slit of which a width on a center line of the common electrode is greater than a width on an outer line of the common electrode, wherein the at least one pixel slit is misaligned with the at least one common slit between the sub pixel electrode and the common electrode.