Array Substrate Electrode Segmentation for Storage Capacitance
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Solution Overview
Problem
Conventional TFT-LCD array substrates experience defects in charge and discharge due to large storage capacitance, which is more pronounced in larger and higher frequency displays, leading to reduced light transmission and increased energy consumption.
Innovation Solution
The array substrate design incorporates a first common electrode below the pixel electrode, separated by an insulating layer, and a second common electrode in the same layer as the pixel electrode, with alternately arranged strip electrodes to form both fringe and in-plane electric fields, reducing storage capacitance and enhancing liquid crystal control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the common electrode and pixel electrode have a large overlap region, then the storage capacitance is relatively large, but this causes defects in charge and discharge of pixels
Solution Approach 1:
The common electrode is segmented into two parts: a first common electrode (plate electrode) and a second common electrode (strip electrodes in the same layer as pixel electrodes). This segmentation allows the first common electrode to form the necessary overlap region for storage capacitance, while the second common electrode alternately arranged with pixel electrodes reduces the harmful overlap and improves charge/discharge performance.
2Quantity of substance
If the overlap region between common electrode and pixel electrode is large, then storage capacitance is increased, but light transmission is reduced
Solution Approach 1:
The solution moves from a single-plane overlap configuration to a multi-dimensional arrangement where the second common electrode strips are interleaved with pixel electrode strips in the same layer. This dimensional reorganization maintains necessary capacitance through the first common electrode while reducing the overlapping area in the projection plane, thereby improving light transmission.
3Quantity of substance
If the overlap region between common electrode and pixel electrode is large, then storage capacitance is increased, but energy consumption increases
Solution Approach 1:
By dividing the common electrode into two functional parts, the invention maintains adequate storage capacitance through the first common electrode while the second common electrode configuration reduces excessive overlap, thereby lowering energy consumption without sacrificing necessary capacitance for pixel maintenance.
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 reduces storage capacitance, enhances liquid crystal control, increases light transmission, and decreases energy consumption by optimizing the overlap region between electrodes, thereby mitigating defects in charge and discharge and improving display performance.
Implementation Method 1
A fringe electric field Ef is formed between the pixel electrode 2 and the common electrode 1
Implementation Method 2
the first common electrode is provided below the pixel electrode and separated from the pixel electrode by an insulating layer
Data Source
AI summary
Embodiments of the invention provide an array substrate and a display device. The array substrate comprises a common electrode and a pixel electrode that are formed on a base substrate. The common electrode comprises a first common electrode and a second common electrode, the first common electrode is provided below the pixel electrode and separated from the pixel electrode by an insulating layer, the second common electrode is provided in the same layer as the pixel electrode. The pixel electrode comprises a plurality of strip electrodes, the second common electrode also comprises a plurality of strip electrodes, and the strip electrodes of the pixel electrode and the strip electrodes of the second common electrode are alternately arranged.