Auxiliary Electrode Layer Reduces Coupling Capacitance in Touch Display Panels
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Solution Overview
Problem
Conventional touch display panels experience accuracy issues in touch detection due to coupling capacitance between wiring and electrode blocks, particularly in medium to large-sized applications.
Innovation Solution
An array substrate is designed with an auxiliary electrode layer located between the common electrode layer and the wiring layer, or on a side of the wiring layer facing the substrate, which is insulated from both and receives a touch driving signal during touch timing and a common voltage signal during display timing, reducing coupling capacitance and enhancing touch signal strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common electrode layer and wiring layer are arranged on different sides of the substrate with an insulating layer between them, then the structural stability is improved, but coupling capacitance is formed between the wiring and electrode blocks which reduces touch detection accuracy
Solution Approach 1:
An auxiliary electrode layer is introduced as an intermediary component between the common electrode layer and wiring layer. This auxiliary electrode layer acts as a mediator to adjust the electric field distribution and reduce coupling capacitance between the wiring and electrode blocks, thereby improving touch detection accuracy while maintaining the stable structure of having electrode and wiring layers on opposite sides of the substrate.
2Measurement precision
If the common electrode layer and wiring layer are arranged on the same side of the substrate, then coupling capacitance is reduced improving touch detection accuracy, but the structural stability and insulation between layers deteriorates
Solution Approach 1:
The auxiliary electrode layer serves as an intermediary that enables the common electrode and wiring to be arranged on the same side while maintaining proper insulation and structural stability. It provides the necessary electrical isolation and mechanical support, allowing the beneficial reduced coupling capacitance configuration to be implemented without compromising reliability.
Solution Approach 2:
The solution moves from a simple two-layer arrangement to a three-layer configuration by introducing the auxiliary electrode layer as an additional dimension in the vertical stacking. This dimensional addition allows both electrodes and wiring to coexist on the same side with proper spacing and insulation, reducing coupling capacitance while maintaining structural integrity.
3Measurement precision
If an auxiliary electrode layer is added between the common electrode layer and wiring layer, then coupling capacitance is reduced and touch detection accuracy is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The electrode system is segmented into distinct functional layers: the common electrode layer, the auxiliary electrode layer, and the wiring layer. This segmentation allows each layer to be optimized for its specific function - the auxiliary layer specifically for reducing coupling capacitance - while maintaining overall system manageability through clear functional separation.
Solution Approach 2:
The auxiliary electrode layer performs multiple functions simultaneously: it reduces coupling capacitance between wiring and electrodes, provides electrical insulation between layers, and maintains structural stability of the overall assembly. This multi-functionality justifies the added complexity by delivering multiple benefits from a single component.
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
The auxiliary electrode layer effectively reduces coupling capacitance, improving the accuracy and strength of touch detection signals, thereby enhancing the overall touch detection performance.
Implementation Method 1
coupling capacitance may be formed between the wiring 14 and the electrode block 13 which is not connected to the wiring 14 in an extending direction of the wiring 14
Data Source
AI summary
An array substrate and a touch display panel are provided. An auxiliary electrode layer is additionally provided in the array substrate. The auxiliary electrode layer may be located between a common electrode layer and a wiring layer, or located on a side of the wiring layer facing toward the substrate. The auxiliary electrode layer is provided to reduce coupling capacitance between the wiring and the touch display electrode. With the auxiliary electrode layer additionally provided in the array substrate, the coupling capacitance between the wiring and the touch display electrode block is reduced, thereby improving accuracy of the touch detection.