Supplementary Electrode for LCD Slit Field Control
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Solution Overview
Problem
In mobile patterned vertical alignment liquid crystal displays (mPVA LCDs), the liquid crystal in the space between slits is not effectively controlled, leading to reduced transmissivity and suboptimal display quality.
Innovation Solution
A method of driving the LCD apparatus involves applying a common voltage to a common electrode and pixel voltages to pixel electrodes, with a supplementary voltage applied to a supplementary electrode between the slits to compensate the electric field, using a row-inversion, column-inversion, or dot-inversion method, and an array substrate with a supplementary electrode formed between the slits to enhance electric field control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If slits are formed in the pixel electrode to improve viewing angle, then viewing angle is improved, but liquid crystal control in the space between slits deteriorates leading to reduced transmissivity
Solution Approach 1:
The pixel electrode is divided into multiple segments by forming slits, which enables improved viewing angle. However, the space between slits creates uncontrolled liquid crystal regions. The invention segments the electric field control by introducing a supplementary electrode that specifically addresses the regions between slits, allowing each segment (slit and inter-slit area) to be independently optimized.
Solution Approach 2:
A supplementary electrode is introduced as an intermediary element between the pixel electrode and the liquid crystal layer. This supplementary electrode acts as a mediator to provide additional electric field control specifically in the inter-slit regions, enabling independent optimization of these previously uncontrolled areas without affecting the slit-based viewing angle improvement.
2Adaptability or versatility
If the ratio of slit area to pixel area is increased to improve viewing angle, then viewing angle is improved, but aperture ratio deteriorates
Solution Approach 1:
Different regions of the pixel electrode are given different functions: the slit regions are optimized for viewing angle control while the inter-slit regions are optimized for light transmissivity through supplementary electrode control. This local differentiation allows each region to contribute its strength without compromising the other, effectively resolving the aperture ratio vs. viewing angle trade-off.
Solution Approach 2:
The invention adds a new dimension to electric field control by introducing the supplementary electrode that operates independently from the main pixel electrode. This additional control dimension allows simultaneous optimization of both slit-based viewing angle and inter-slit aperture ratio, transforming a two-dimensional trade-off into a multi-dimensional optimization problem.
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 approach improves the aperture ratio and viewing angle of the LCD, resulting in enhanced display quality and increased light transmissivity.
Implementation Method 1
When the pixel electrode and the common electrode respectively receive voltages, the electric field is applied to the liquid crystal layer. Liquid crystal molecules in the liquid crystal layer are arranged based on the electric field
Implementation Method 2
a supplementary voltage is applied to a supplementary electrode between the slits of each pixel electrode to compensate the electric field formed by the pixel electrodes and the common electrode
Data Source
AI summary
In a method of driving a liquid crystal display (“LCD”) apparatus, a common voltage is applied to a common electrode above a liquid crystal layer and pixel voltages are applied to pixel electrodes under the liquid crystal layer to form an electrical field with the common electrode to control movements of liquid crystal molecules of the liquid crystal layer. Each of the pixel electrodes has slits. Then, a supplementary voltage is applied to a supplementary electrode between the slits of each pixel electrode to compensate the electric field formed by the pixel electrodes and the common electrode.