Same-Layer Touch Electrodes for Narrow Bezel Displays
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Solution Overview
Problem
Existing touch panels with separate first and second electrode layers and insulating layers in capacitive touch panels result in increased thickness, complex structures, and wide perimeters, making them costly and difficult to manufacture with narrow bezel designs.
Innovation Solution
The touch panel design features first and second touch electrodes on the same layer, with sub-electrodes connected in series and insulated from each other, and both sets of electrodes connected to a single bonding area, reducing thickness and complexity by eliminating the need for an insulating layer between them and allowing for a staggered arrangement to simplify the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate first and second electrode layers with insulating layers are used, then touch functionality is achieved, but thickness and structural complexity increase
Solution Approach 1:
The patent merges the first and second electrode layers into a single layer, where first touch electrodes and second touch electrodes coexist in the same layer without requiring insulating layers between them. This consolidation eliminates the need for separate insulating layers while maintaining the capacitive touch detection functionality through the staggered arrangement of electrodes.
Solution Approach 2:
The second touch electrode is segmented into multiple sub-electrodes (first sub-electrode and second sub-electrode) that are arranged in a staggered pattern relative to the first touch electrode. This segmentation allows the electrodes to be differentiated and function independently for touch detection while sharing the same layer, reducing overall structural complexity.
2Reliability
If separate electrode layers with insulating layers are used, then electrode insulation is achieved, but overall thickness increases
Solution Approach 1:
The patent combines multiple electrode functions into a single layer, eliminating the need for separate insulating layers that would increase thickness. The staggered arrangement of first and second touch electrodes in the same layer provides natural spatial insulation while maintaining thin profile.
3Reliability
If traditional electrode arrangements are used, then touch detection is achieved, but bezel width increases
Solution Approach 1:
The second touch electrode is divided into multiple sub-electrodes arranged in a staggered pattern, allowing for more efficient space utilization. This segmentation enables the touch detection function to be maintained with reduced peripheral spacing, facilitating narrower bezel designs.
Solution Approach 2:
The patent transitions from a traditional layered arrangement to a planar staggered arrangement within the same layer. This dimensional reorganization allows electrodes to be positioned more efficiently in the horizontal plane, reducing the required bezel area while maintaining touch detection capability.
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 design reduces the overall thickness and simplifies the manufacturing process, enabling a more compact and cost-effective touch panel with a narrower bezel, while maintaining touch functionality by detecting capacitance changes between the electrodes.
Implementation Method 1
the touch panel has a display area and a peripheral area positioned at a perimeter of the display area, and the peripheral area has a bonding area; and the touch panel further includes: a plurality of first leads, each of the first touch electrodes being connected to the bonding area through each of the first leads in a one-to-one correspondence; and a plurality of second leads, each of the sub-electrodes being connected to the bonding area through each of the second leads in a one-to-one correspondence
Data Source
AI summary
A display device, a touch panel and a method for manufacturing the touch panel. The touch panel of the present disclosure includes a substrate, a plurality of first touch electrodes, and a plurality of second touch electrodes. The first touch electrodes are arranged on the substrate. The second touch electrodes are arranged in the same layer as the first touch electrodes. Each of the second touch electrodes is formed by connecting in series a plurality of sub-electrodes insulated from the first touch electrodes, and two adjacent sub-electrodes in the same second touch electrode are respectively positioned on two sides of one of the first touch electrodes.