Array Substrate Dual Common Electrodes High Resolution
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Solution Overview
Problem
As display device resolution increases, the reduced area of pixel and common electrodes leads to decreased storage capacitance, causing voltage fluctuations on pixel electrodes during display stages in fringe field switching (FFS) technology.
Innovation Solution
The implementation of an array substrate with a thin film transistor, a first common electrode, a pixel electrode electrically insulated from the first common electrode, and a second common electrode, where the pixel electrode is connected to the drain electrode, and both common electrodes are configured to have the same electric potential, forming parallel capacitors to maintain stable pixel voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of display devices is increased, then the display quality is improved, but the area of pixel electrodes and common electrodes decreases, leading to reduced storage capacitance and voltage fluctuation
Solution Approach 1:
The common electrode is divided into two separate common electrodes (first common electrode and second common electrode). Each forms a storage capacitor with the pixel electrode, effectively doubling the total storage capacitance while maintaining the same pixel area. This segmentation allows the display to achieve high resolution without sacrificing capacitance stability
Solution Approach 2:
The patent introduces a vertical stacking dimension by placing the pixel electrode between two common electrodes (first common electrode below and second common electrode above). This three-dimensional capacitor configuration increases the effective capacitance area without expanding the planar pixel area, thus maintaining storage capacitance in high-resolution displays
2Area of stationary object
If the area of pixel electrode and common electrode is reduced, then the aperture ratio is improved, but the storage capacitance decreases, causing voltage fluctuation on pixel electrode
Solution Approach 1:
The common electrode is segmented into two separate electrodes positioned on opposite sides of the pixel electrode. This creates two storage capacitors in parallel, doubling the total capacitance while allowing each individual electrode to maintain smaller area, thus improving aperture ratio while preserving voltage stability
Solution Approach 2:
By transitioning from a planar capacitor configuration to a three-dimensional stacked configuration, the patent increases capacitance through the vertical dimension. The pixel electrode is sandwiched between two common electrodes, effectively utilizing space in the thickness direction to maximize capacitance within limited planar area
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 enhances the storage capacitance of pixel cells, maintaining stable pixel voltage even with reduced electrode areas, thus improving light transmittance efficiency and viewing angles in high-resolution display devices.
Implementation Method 1
a storage capacitor or a pixel capacitor formed by the pixel electrode and the common electrode maintains the pixel voltage on the pixel electrode
Implementation Method 2
a fringe electric field may be generated between pixel electrodes in the same plane and may drive liquid crystal molecules between the electrodes and directly over the electrodes to move and transform in a direction parallel to the substrate
Data Source
AI summary
The present disclosure provides an array substrate, a fabrication method thereof, and a display device. The array substrate includes a base substrate, a thin film transistor over the base substrate, a first common electrode over the base substrate, a pixel electrode over the first common electrode and being electrically insulated from the first common electrode, and a second common electrode disposed over the pixel electrode and being electrically insulated from the pixel electrode. The pixel electrode is electrically connected to a drain electrode of the thin film transistor.