Staggered Via Hole Array Substrate for Display Stability
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Solution Overview
Problem
Conventional array substrates using COA technology face issues with low storage capacitance due to large spacing between electrodes, leading to reduced display stability and quality, and difficulties in controlling the shape of deep via holes, which affects the aperture ratio and risk of pixel electrode breakage.
Innovation Solution
The array substrate divides the color filter layer into two thin material layers with staggered conductive interlayers forming via holes, reducing the distance between electrodes and via hole depth, thereby increasing storage capacitance and improving display stability and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the color filter layer is made relatively thick to meet color filter requirements, then the color filter performance is improved, but the spacing between the pixel electrode and common electrode becomes large, resulting in low storage capacitance and reduced display stability
Solution Approach 1:
The color filter layer is divided into a first color filter layer and a second color filter layer. The first conductive interlayer is positioned between these two layers, creating a segmented structure that allows the storage capacitance to be formed with a smaller spacing while maintaining the necessary color filter thickness for performance.
2Manufacturing precision
If a single deep via hole is formed to connect the pixel electrode and drain through the thick color filter layer, then the electrical connection is achieved, but the via hole shape is difficult to control, resulting in excessive aperture ratio and reduced pixel opening ratio
Solution Approach 1:
The single deep via hole is divided into a first via hole in the first color filter layer and a second via hole in the second color filter layer. This segmentation reduces the depth of each individual via hole, making the shape easier to control and reducing the aperture ratio of each via hole, thereby increasing the overall pixel opening ratio.
3Reliability
If the via hole depth is large to penetrate the thick color filter layer, then the electrical connection through the color filter is achieved, but the abrupt gradient angle of the inner wall causes pixel electrode breakage
Solution Approach 1:
The deep via hole is segmented into two shallower via holes (first via hole and second via hole) positioned at different depths. This reduces the depth of each via hole and creates a more gradual gradient angle for the inner walls, preventing pixel electrode breakage while maintaining electrical connection.
4Quantity of substance
If the spacing between pixel electrode and common electrode is large due to thick color filter layer, then the color filter thickness requirement is met, but the storage capacitance is insufficient to meet leakage current requirements
Solution Approach 1:
The color filter layer is segmented into two layers with the first conductive interlayer positioned between them. This allows the storage capacitance to be formed with a smaller spacing between the first conductive interlayer and the common electrode, while the combined thickness of the two color filter layers maintains the necessary color filter performance.
Data Source
AI summary
An array substrate and a display device incorporating the array substrate are disclosed. The array substrate comprises a first material layer located on a thin film transistor, the first material layer having a first via hole; a conductive interlayer located on the first material layer, the conductive interlayer being electrically connected with the drain of the thin film transistor through the first via hole; and a second material layer located on the conductive interlayer, the second material layer having a second via hole staggered with the first via hole. A pixel electrode is located on the second material layer. The conductive interlayer is electrically connected with the pixel electrode through the second via hole, so as to form a storage capacitance with a common electrode. The array substrate has an increased storage capacitance and provides the display device with improved display stability, pixel opening ratio, and display quality.