Storage Electrode Oblique Angle Prevents Light Leakage
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Solution Overview
Problem
Liquid crystal display apparatuses operating in the OCB mode experience misalignment of bend alignment at step differences and edges of pixel electrodes, leading to light leakage and color distortion, particularly at lower white gray scale voltages, which degrade display quality.
Innovation Solution
An array substrate with a storage electrode part having an angle of 40-50 degrees relative to the alignment direction is integrated, including a triangular common electrode pattern and oblique lines, to prevent misalignment and light leakage by aligning liquid crystal molecules perpendicular to the polarizing axes, thus maintaining display quality without increasing critical voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the storage common line is formed in a direction substantially in parallel with the alignment direction of liquid crystal molecules, then the manufacturing process is simplified, but the bend alignment of liquid crystal molecules becomes misaligned at step difference portions, causing light leakage and color distortion
Solution Approach 1:
The storage common line is designed with an asymmetric orientation at a specific angle (40-50 degrees) relative to the alignment direction, rather than being parallel. This asymmetric configuration prevents the misalignment of bend alignment at step difference portions while maintaining manufacturing feasibility.
2Use of energy by moving object
If the white gray scale voltage is lowered below the critical voltage Vc, then energy consumption is reduced, but the bend alignment of liquid crystal molecules starts to misalign, causing light leakage and color distortion
Solution Approach 1:
The storage common line is pre-configured with a specific angular orientation (40-50 degrees) that creates a preliminary counteracting effect against the misalignment force. This preliminary anti-action prevents bend alignment misalignment even when the white gray scale voltage is lowered below the critical voltage Vc, allowing energy reduction without sacrificing reliability.
3Adaptability or versatility
If the alignment direction is set at 45 degrees to the transmission axis of the polarizing plate for optimal viewing angle, then viewing angle is improved, but light leakage occurs at step difference portions of the storage common line
Solution Approach 1:
The storage common line is given a specialized local quality with a specific angular orientation (40-50 degrees) that differs from the general alignment direction. This local quality adjustment at the storage common line prevents light leakage at step difference portions while maintaining the 45-degree alignment direction for optimal viewing angle performance.
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 effectively prevents light leakage and color distortion by aligning liquid crystal molecules, enhancing display quality and maintaining transmittance without the need for higher critical voltages, thereby improving the overall performance of liquid crystal display panels.
Implementation Method 1
A liquid crystal display apparatus may be operated in an optical compensated birefringence (OCB) mode to improve a response speed and a viewing angle
Implementation Method 2
The liquid crystal molecules are tilted in a same direction during a driving time, so that the liquid crystal display apparatus operated in the OCB mode has a quick response speed as well as a wide viewing angle
Data Source
AI summary
An array substrate includes a switching device, a pixel electrode, an alignment layer and a storage electrode part. The switching device is formed in a pixel area defined by gate lines and data lines. The pixel electrode is formed in the pixel area and electrically connected to the switching device. The alignment layer is formed on the pixel electrode and rubbed in a predetermined alignment direction. The storage electrode part is formed in an area adjacent to the switching device. The storage electrode part includes at least one side having an angle of about forty degrees to about fifty degrees with respect to the alignment direction. The array substrate improves display quality of the liquid crystal display panel.