Array Substrate Shielding Electrode for LCD Transmissivity
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Solution Overview
Problem
Mobile patterned vertical alignment (mPVA) LCD devices with linear polarization mode face reduced transmissivity due to difficulty in controlling liquid crystals at micro-slits on the pixel electrode, leading to deteriorated display quality compared to circular polarization modes.
Innovation Solution
An array substrate design featuring a pixel electrode with an outline portion, connection portions, and slit portions, along with a shielding electrode, is used to improve liquid crystal control and transmissivity, where the slit portions protrude from the connection portions and connect to the outline portion, and the shielding electrode is placed along the outline portions to shield the data and gate lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a micro-slit mode is used with slits formed on the pixel electrode to improve transmissivity, then the aperture ratio can be increased, but controlling the liquid crystal at edges of micro-slits or between the micro-slits becomes difficult and display quality deteriorates
Solution Approach 1:
A shielding electrode is introduced as an intermediary element positioned between the pixel electrode and the data line. This shielding electrode acts as a mediator to control and regulate the electric field distribution, particularly at the edges of micro-slits, thereby improving liquid crystal control without sacrificing the transmissivity benefits of the micro-slit structure
Solution Approach 2:
The pixel electrode structure is modified with localized features including protrusions at the edges of micro-slits and a specifically positioned shielding electrode. These local structural modifications create different electric field characteristics at critical locations (slit edges) compared to other areas, enabling precise control of liquid crystal molecules at these problematic regions while maintaining overall high transmissivity
2Area of moving object
If a linear polarization optical mode is applied to mPVA mode to improve aperture ratio, then the aperture ratio can be increased, but transmissivity is reduced due to fringe field control issues
Solution Approach 1:
The invention changes the electrical parameters of the system by introducing a shielding electrode with specific potential control. This modifies the electric field distribution parameters, allowing the liquid crystal to be properly controlled in linear polarization mode while maintaining high aperture ratio, thereby resolving the transmissivity issue without sacrificing aperture
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 design enhances the display quality and transmissivity of the LCD device by effectively controlling liquid crystals and maintaining a high aperture ratio, improving viewing properties and contrast ratio compared to traditional micro-slit modes.
Implementation Method 1
The shielding electrode is arranged along the outline portions on the data line and the outline portions on the gate line to shield the data line and the gate line, respectively
Implementation Method 2
the pixel electrode includes an outline portion, a plurality of connection portions, and a plurality of slit portions... The slit portions protrude from side surfaces of the connection portions in each of the domains, and the slit portions connect to the outline portion
Data Source
AI summary
In an array substrate, a method of manufacturing the array substrate, and a liquid crystal display (LCD) device having the array substrate, a pixel electrode includes an outline portion, connection portions, and slit portions. The outline portion is arranged toward a data line and a gate line thereon, and the connection portions extend in a direction that crosses the data line and the gate line, respectively, to connect to the outline portion. The slit portions protrude from side surfaces of the connection portions to connect to the outline portion. A shielding electrode is arranged toward the outline portion between the data line and the outline portion, and the gate line and the outline portion.