Display Panel Touch Layer Floating Electrode Short Circuit Prevention
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Solution Overview
Problem
Conventional Direct on Cell (DOT) touch technique faces issues with short circuits and abnormal capacitance due to the narrow disconnection areas between touch driving electrodes, touch sensing electrodes, and floating electrodes in the same layer, affecting optical consistency and product yield.
Innovation Solution
The display panel and device feature a touch layer with floating electrodes and touch electrodes in different layers, eliminating the need for disconnection areas and preventing short circuits, while maintaining optical consistency by using a bridging electrode and hallowed areas for electrical connection, and incorporating a bending identification wire for self-capacitance-based bending position identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the width of the disconnection area is reduced to ensure optical consistency, then the optical consistency within the touch layer is improved, but the short circuit phenomenon may occur among electrodes
Solution Approach 1:
The patent transitions from a planar arrangement where touch electrodes and floating electrodes share the same layer to a three-dimensional stacked arrangement. The touch electrodes are placed in the touch layer while floating electrodes are positioned in a separate package layer below, separated by an insulating layer. This vertical separation in another dimension eliminates the short circuit risk while allowing the disconnection areas to be minimized for optimal optical consistency.
Solution Approach 2:
An insulating layer is introduced as an intermediary between the touch layer containing touch electrodes and the package layer containing floating electrodes. This insulating layer acts as a mediator that prevents electrical short circuits between the two types of electrodes while allowing them to be positioned close together for optimal optical performance and capacitance coupling.
2Illumination intensity
If the disconnection area is made narrow to maintain optical consistency, then the display quality is improved, but the capacitance becomes abnormal due to short circuits
Solution Approach 1:
By moving floating electrodes to a separate package layer below the touch layer, the patent creates vertical separation that prevents short circuits. This allows disconnection areas to be made narrow for optimal display quality while maintaining proper capacitance values through the controlled insulation distance and area between layers.
Solution Approach 2:
The insulating layer serves as a mediator that controls the electrical coupling between touch electrodes and floating electrodes. By adjusting the properties and thickness of this insulating layer, the patent maintains abnormal capacitance values while preventing short circuits, thus preserving both display quality and capacitance control.
3Device complexity
If floating electrodes and touch electrodes are positioned in the same layer, then the structure is simpler, but short circuits and abnormal capacitance occur
Solution Approach 1:
The patent resolves the contradiction by transitioning from a single-layer planar structure to a multi-layer three-dimensional structure. Touch electrodes remain in the touch layer while floating electrodes are positioned in a separate package layer below, separated by an insulating layer. This vertical arrangement in another dimension maintains structural simplicity while ensuring reliable electrical isolation.
Solution Approach 2:
An insulating layer is introduced as an intermediary between the touch layer and package layer. This insulating layer acts as a mediator that maintains electrical isolation between floating electrodes and touch electrodes, preventing short circuits while allowing the overall structure to remain relatively simple and integrated.
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
This configuration effectively prevents short circuits and abnormal capacitance issues, enhancing the consistency of display content and product yield while allowing for flexible and ductile display applications.
Implementation Method 1
incorporating a bending identification wire for self-capacitance-based bending position identification
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a touch layer. The touch layer includes: a first insulating layer, a first metal layer patterned to form a first floating electrode, a second floating electrode and a bridging electrode, a second insulating layer, a second metal layer patterned to form a first touch electrode and a second touch electrode, and a passivation layer. The first touch electrode is electrically connected to the bridging electrode through the via. This solves the short circuit and abnormal capacitance issues of the conventional DOT technique and raises the consistency of display content and the product yield.