Touch Substrate Vertical Signal Routing for Frameless Design
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Solution Overview
Problem
Current touch display panels face challenges in achieving a frameless design with no blind spots due to the need for large signal wiring areas, which result in frame presence and touch blind areas, and issues like increased resistance and crosstalk when reducing wire widths and spacings.
Innovation Solution
A touch substrate design featuring a base substrate with touch electrodes forming mutual capacitance, a signal wiring system integrated above the touch electrode layer using via holes, and an optional shield layer made of transparent conductive material to prevent crosstalk and moire effects, allowing for a frameless and blind-spot-free touch display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If signal wiring is arranged in peripheral areas, then touch electrodes can be fully exposed, but frameless design and no-blind-spot requirement cannot be achieved
Solution Approach 1:
The patent transitions signal wiring from the planar peripheral arrangement to a three-dimensional configuration by routing wires through via holes vertically through insulating layers. This dimensional change allows signal wiring to be integrated within the panel structure rather than occupying peripheral display areas, enabling frameless design while maintaining full touch electrode exposure.
Solution Approach 2:
The patent embeds signal wiring within the multi-layer structure of the touch panel by nesting conductive traces inside insulating layers and connecting them through via holes. This nesting approach integrates the wiring system within the panel's internal architecture, eliminating the need for peripheral wiring areas and achieving both frameless design and no-blind-spot requirements.
2Area of stationary object
If wire width and spacing are reduced, then peripheral area can be minimized, but resistance increases and crosstalk occurs
Solution Approach 1:
The patent introduces insulating layers as intermediary materials between adjacent signal wiring traces and between the wiring and touch electrodes. These insulating layers act as mediators that electrically isolate the wiring, preventing crosstalk while allowing the wiring to be routed through the panel structure with reduced width and spacing without compromising signal transmission quality.
3Shape
If signal wiring is integrated above touch electrode layer, then frameless and no-blind-spot design is achieved, but crosstalk and moire effects increase
Solution Approach 1:
The patent employs insulating layers and shield layers as intermediary elements between the integrated signal wiring and touch electrodes. These intermediaries electrically isolate the wiring from the electrodes, reducing crosstalk. The shield layer specifically addresses moire effects by providing a reference pattern that interferes with and cancels out the moire interference generated by the wiring-electrode interaction.
Solution Approach 2:
The patent converts the potentially harmful moire effect into a beneficial shielding mechanism. By introducing a shield layer with specific patterning, the moire-like interference patterns are created in a controlled manner to cancel out the harmful moire effects generated by the interaction between signal wiring and touch electrode patterns, thereby reducing overall visual interference.
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 solution enables a frameless touch display panel with no blind spots by eliminating the need for peripheral signal wiring and reducing crosstalk, while also minimizing the occurrence of moire effects, thus enhancing touch recognition accuracy and display quality.
Implementation Method 1
an optional shield layer made of transparent conductive material to prevent crosstalk
Implementation Method 2
a signal wiring arranged above the first insulating layer and connected to a corresponding one of the first touch electrodes and the second touch electrodes through the first via hole
Data Source
AI summary
Embodiments of the present disclosure describe a touch substrate and its manufacturing method and a touch display panel. The touch substrate includes a base substrate, a touch electrode layer arranged above the base substrate and includes a plurality of first touch electrodes and a plurality of second touch electrodes, each of the first touch electrodes and each of the corresponding second touch electrodes forming a mutual capacitance, a first insulating layer arranged above the touch electrode layer, a first via hole located in the first insulating layer, and a signal wiring arranged above the first insulating layer and connected to a corresponding one of the first touch electrodes and the second touch electrodes through the first via hole.