Touch Display Panel Bank Structure for Lower Parasitic Capacitance
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Solution Overview
Problem
Parasitic capacitance formed between touch electrodes and other electrodes in touch display devices reduces the accuracy of touch sensing.
Innovation Solution
A display device structure is designed with a substrate, bank, cathode electrode, encapsulation layer, touch insulating layer, and touch metal, where the encapsulation layer has varying thicknesses to minimize parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If touch electrodes and touch lines are arranged in a complicated structure to enable touch sensing, then touch input detection capability is improved, but parasitic capacitance between electrodes and lines increases
Solution Approach 1:
The patent extracts the harmful parasitic capacitance by introducing a first insulating layer between the touch electrode and the second electrode (cathode electrode). This insulating layer physically separates the conductive elements, removing the harmful capacitive coupling while preserving the necessary touch sensing functionality through the transparent conductive oxide layers.
Solution Approach 2:
The patent introduces a first insulating layer as an intermediary between the touch electrode and the second electrode. This insulating layer acts as a mediator that prevents direct capacitive coupling between the electrodes while allowing the touch sensing mechanism to function properly through the transparent conductive oxide structures.
2Adaptability or versatility
If a touch panel with multiple electrodes and lines is integrated into the display panel, then touch sensing function is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the touch sensing functionality with the display panel structure by integrating the touch electrode, transparent conductive oxide layers, and insulating layers into the existing display panel manufacturing process. The touch panel and display panel are fabricated together in a unified structure, reducing overall device complexity despite adding touch sensing capability.
Solution Approach 2:
The patent creates a multi-functional display panel that simultaneously provides display functionality and touch sensing functionality. The transparent conductive oxide layers and insulating layers serve dual purposes: maintaining the display panel's optical properties while enabling touch sensing through the integrated electrode structures.
3Measurement precision
If insulating layers are added between electrodes to reduce parasitic capacitance, then touch sensing accuracy is improved, but device structure becomes more complex
Solution Approach 1:
The patent applies local quality by placing the first insulating layer specifically between the touch electrode and the second electrode where parasitic capacitance occurs, while leaving other regions of the display panel structure unchanged. This localized approach reduces parasitic capacitance without unnecessarily complicating the entire device structure.
Data Source
AI summary
A display device and a display panel are discussed. The display device can include a substrate, a bank disposed on the substrate, a cathode electrode disposed on the bank, an encapsulation layer disposed on the cathode electrode, a touch insulation layer disposed on the encapsulation layer, and a touch metal disposed on the touch insulation layer. The display device provides an advantage of preventing or reducing the formation of parasitic capacitance in the touch metal through a trench structure of the bank.