Array Substrate Filling Electrode Reduces Crosstalk
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Solution Overview
Problem
In touch display panels, the coupling capacitance between data lines and pixel electrodes leads to significant crosstalk, causing display issues such as dark spots and reduced yield due to the thickness of intervening layers and the width of drain electrodes.
Innovation Solution
The array substrate design includes a through hole in the planarization layer with a filling electrode that connects to the drain electrode, allowing the pixel electrode to extend through and indirectly connect with the drain electrode, reducing coupling capacitance and preventing wire breakage by compensating for the segment difference between the drain electrode and the through hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the width of the drain electrode is reduced to increase the distance between the data line and the pixel electrode, then the coupling capacitance is reduced and crosstalk is improved, but the through hole becomes deeper relative to the drain electrode width, causing wire breakage and fall-off of the pixel electrode
Solution Approach 1:
The patent introduces a filling electrode as an intermediary component between the pixel electrode and the drain electrode. This filling electrode fills the through hole and provides additional support structure, allowing the drain electrode width to be reduced for better crosstalk performance while the filling electrode prevents wire breakage by compensating for the increased depth-to-width ratio of the through hole.
Solution Approach 2:
The patent changes the structural parameters by introducing a filling electrode that modifies the effective depth and support characteristics of the through hole. This allows the drain electrode width to be reduced (changing the geometric parameters) while maintaining reliability through the modified support structure provided by the filling electrode.
2Object-affected harmful factors
If the intervening layer between the pixel electrode and the drain electrode is made thicker to reduce coupling capacitance, then the crosstalk is reduced, but the through hole depth increases, leading to wire breakage and fall-off of the pixel electrode
Solution Approach 1:
The filling electrode serves as an intermediary that allows the intervening layer to be thicker for reduced coupling capacitance while providing structural support to prevent wire breakage. The filling electrode compensates for the increased mechanical stress caused by the deeper through hole.
3Manufacturing precision
If the drain electrode width is reduced to improve display quality, then the crosstalk phenomenon is reduced, but the manufacturing yield decreases due to wire breakage and pixel electrode fall-off
Solution Approach 1:
The filling electrode acts as a mediator that enables reduced drain electrode width for better display quality while preventing manufacturing defects. By providing additional structural support in the through hole, it reduces the occurrence of wire breakage and pixel electrode fall-off during manufacturing, thereby maintaining or improving yield.
Solution Approach 2:
The filling electrode provides beforehand cushioning by pre-establishing structural support in the through hole before the pixel electrode is fully assembled. This preventive measure compensates for the increased mechanical vulnerability caused by the deeper through hole, reducing the likelihood of wire breakage during subsequent manufacturing steps.
Data Source
AI summary
The present disclosure provides an array substrate, including: a base substrate, a plurality of scan lines; a plurality of data lines arranged by intersecting with the plurality of scan lines; a plurality of thin film transistors arranged in a matrix, each thin film transistor includes a gate electrode, an active layer and a drain electrode; a planarization layer covering the gate electrode, the active layer and the drain electrode, a position of the planarization layer corresponding to the drain electrode is provided with a through hole penetrating through the planarization layer, and the drain electrode is located in the through hole; a filling electrode, located in the through hole and connected with the drain electrode and covers the drain electrode; and a pixel electrode, indirectly connected with the drain electrode through the filling electrode.