Integrated Electromagnetic and Capacitive Touch Substrate
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The integration of electromagnetic and capacitive touch structures into a single touch panel is complex due to the separate preparation of these structures, leading to increased complexity and manufacturing costs.
Innovation Solution
An integrated electromagnetic and capacitive touch substrate is designed with driving electrodes, sensing electrodes, and coils arranged on the same layer, allowing for both capacitive and electromagnetic touch functions by alternating their arrangement and using separate detection circuits for each mode, simplifying the structure and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnetic and capacitive touch structures are prepared separately, then each structure can be optimized independently, but the overall structure complexity and manufacturing process complexity increase
Solution Approach 1:
The patent merges electromagnetic touch structures and capacitive touch structures into a single integrated touch substrate. The coil patterns for electromagnetic sensing and the electrode patterns for capacitive sensing are formed in the same layer using a unified manufacturing process, eliminating the need for separate preparation of different touch structures while maintaining both touch functions simultaneously.
Solution Approach 2:
The touch substrate is designed to perform multiple functions simultaneously: it serves as both an electromagnetic touch sensing structure (with coils) and a capacitive touch sensing structure (with electrodes). This multi-functional design allows a single substrate to replace what would traditionally require separate structures, reducing overall complexity while maintaining reliability of both touch modes.
2Manufacturing precision
If electromagnetic and capacitive touch structures are prepared separately, then each structure can be optimized independently, but the manufacturing process complexity and costs increase
Solution Approach 1:
The patent combines the formation of electromagnetic coils and capacitive electrodes into a single manufacturing process step. Both structures are patterned simultaneously in the same layer using one set of photolithography and etching processes, eliminating multiple separate manufacturing steps and reducing process complexity while maintaining manufacturing precision for both structures.
Solution Approach 2:
A single manufacturing process is designed to create both electromagnetic and capacitive touch structures with the required precision. The unified process uses common materials and fabrication steps to form both types of structures, simplifying the manufacturing workflow while achieving the necessary structural accuracy for reliable touch sensing.
3Measurement precision
If driving electrodes and sensing electrodes are arranged alternately, then touch coordinate detection resolution is improved, but the layout complexity increases
Solution Approach 1:
The touch substrate is segmented into alternating driving electrode regions and sensing electrode regions arranged in a regular pattern. This segmentation allows for high-resolution touch coordinate detection by providing closely spaced measurement points while maintaining a systematic, repeatable layout that simplifies the overall design and manufacturing process.
Solution Approach 2:
The patent employs an asymmetric alternating arrangement where driving electrodes and sensing electrodes are positioned in specific non-uniform patterns optimized for touch detection. This asymmetric layout enhances measurement precision by creating favorable electromagnetic field distributions for capacitive sensing while the regular alternation maintains manufacturing simplicity through predictable pattern repetition.
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 enables efficient detection of touch coordinates in both directions, enhancing resolution and simplifying the manufacturing process while reducing costs, thereby improving the functionality and production efficiency of touch panels.
Implementation Method 1
An electromagnetic touch panel, a varying magnetic field is generated by a coil on a special electromagnetic stylus. An electromagnetic inductive coil on the touch panel induces the varying magnetic field and generates a weak current.
Implementation Method 2
An electromagnetic inductive coil on the touch panel induces the varying magnetic field and generates a weak current. A touch coordinate can be calculated from the weak current.
Implementation Method 3
With a capacitive touch panel, a varying capacitance of a configured sensing capacitor is incurred by the user's touch on the touch panel, thus the touch coordinates are calculated from the varying capacitance.
Data Source
AI summary
An embodiment discloses an integrated electromagnetic and capacitive touch substrate, and a touch display panel. The touch substrate includes: a substrate; and a plurality of driving electrodes, a plurality of sensing electrodes, and a plurality of first coils, arranged on the substrate in the same layer, wherein the plurality of driving electrodes and sensing electrodes are arranged alternately in a first direction; and the plurality of first coils are arranged in the first direction, and each of the first coils surrounds at least one of the driving electrodes and/or the sensing electrodes.