Array Substrate Electrode Layering for Aperture and Flicker Control
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Solution Overview
Problem
Conventional thin film transistor liquid crystal display panels manufactured using the four-mask process technology face issues with low aperture ratio and flickering due to high resistance of the common electrode, which is exacerbated by the need for an auxiliary electrode in the same layer as the pixel electrode, reducing the capacitance of the storage capacitor.
Innovation Solution
The array substrate design includes a base substrate with a first electrode layer of pixel electrodes, a second electrode layer of auxiliary electrodes in a different layer, and a third electrode layer of common electrodes, where through holes in the insulating layer connect the auxiliary electrodes to the common electrodes, allowing for improved aperture ratio and increased storage capacitor capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an auxiliary electrode is arranged in the same layer as the pixel electrode to reduce common electrode resistance, then the resistance is reduced, but the aperture ratio is reduced
Solution Approach 1:
The auxiliary electrode is moved from the same layer as the pixel electrode to a different layer (intermediate layer between pixel electrode and common electrode). This dimensional change allows the auxiliary electrode to overlap with the pixel electrode in the vertical direction without occupying horizontal space, thereby reducing resistance while maintaining aperture ratio.
2Reliability
If an auxiliary electrode is arranged in the same layer as the pixel electrode, then the common electrode resistance is reduced, but the storage capacitor capacitance is reduced
Solution Approach 1:
By positioning the auxiliary electrode in an intermediate layer between the pixel electrode and common electrode, the design enables the auxiliary electrode to connect to the common electrode through vertical connections (through holes) while allowing the pixel electrode and common electrode to maintain full overlapping area for capacitance formation.
3Quantity of substance
If the common electrode has a larger area to form storage capacitor, then the storage capacitor capacitance is increased, but the resistance is increased
Solution Approach 1:
The common electrode system is segmented into the common electrode itself and an auxiliary electrode that is electrically connected to it. The auxiliary electrode is positioned in an intermediate layer and connected through through holes, creating a segmented structure that reduces resistance while allowing the main common electrode to maintain large area for capacitance.
Solution Approach 2:
The auxiliary electrode acts as an intermediary element between the pixel electrode and common electrode. It is positioned in an intermediate layer and connected to the common electrode through through holes, serving as a mediator that reduces resistance without interfering with the capacitance-forming overlap between pixel and common electrodes.
Data Source
AI summary
The present application provides an array substrate and a display panel. By arranging an auxiliary electrode in a second electrode layer that is in a different layer from the pixel electrode, an aperture ratio of a pixel can be increased. In addition to that, a capacity of the storage capacitor can be increased, thereby solving a problem that the display panel is prone to flickering.