Dual-Mode Touch Panel Integrating Capacitive and Electromagnetic Sensing
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Solution Overview
Problem
Current touch panel technologies face challenges in reducing noise interference that affects touch sensitivity, and they often require separate manufacturing and attachment to display panels, limiting their operational flexibility.
Innovation Solution
A display device with a touch panel that operates in two modes, utilizing scan line groups, source line groups, and drivers to induce magnetic fields and detect capacitance variations, allowing for improved touch event sensing and noise reduction, integrated within the display panel structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a touch panel is separately manufactured and attached to the display panel, then the touch panel can be independently optimized, but the device complexity increases and manufacturing precision requirements are heightened
Solution Approach 1:
The patent integrates the touch sensor and display panel into a single unified structure. The touch sensor is formed on the same substrate as the display panel, with scan lines, source lines, and pixel electrodes all integrated into one device. This eliminates the need for separate manufacturing and attachment processes, reducing device complexity while maintaining ease of optimization through unified design.
Solution Approach 2:
The patent creates a multi-functional integrated device where the same structural elements (scan lines, source lines, electrodes) serve both display and touch sensing functions. The display panel structure is designed to simultaneously perform light emission/display and capacitive touch detection, allowing independent optimization of both functions within a single manufacturing process.
2Reliability
If traditional touch sensing methods are used, then the touch panel structure is simple, but noise interference reduces touch sensitivity
Solution Approach 1:
The patent divides the touch sensing function into multiple independent sensing regions corresponding to different areas of the display panel. Each region can be independently sensed and processed, allowing noise in one region to be separated and filtered without affecting other regions. The scan line groups and source line groups are also segmented into multiple sub-groups that can be independently controlled and sensed.
Solution Approach 2:
The patent applies different sensing methods and signal processing techniques to different areas of the touch panel based on local noise characteristics. The third scan line sub-group and third source line sub-group are specifically designed to sense touch events in particular regions with customized signal frequencies and sensing parameters, optimizing touch sensitivity for each local area while reducing the impact of region-specific noise.
3Measurement precision
If multiple scan line sub-groups and source line sub-groups are used, then touch sensing precision is improved, but the device complexity increases
Solution Approach 1:
The patent designs the scan line groups and source line groups with third sub-groups that serve dual purposes: they function as both display driving lines and touch sensing lines. This multi-functional design allows the additional line groups to contribute to both display performance and touch sensing precision without proportionally increasing device complexity, as the same physical structures perform multiple functions.
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 enhances touch sensitivity by reducing noise interference and integrates touch sensing capabilities within the display device, providing a more efficient and flexible touch input system.
Implementation Method 1
A magnetic field is induced by a current path formed by the first scan line sub-group and the second scan line sub-group
Implementation Method 2
The second driver is configured to provide first sensing signals corresponding to a variation in a capacitance from the source line groups
Data Source
AI summary
A display device includes a display panel and a touch panel. The touch panel calculates coordinate information of an input position by an electrostatic capacitive method in a first mode and calculates the coordinate information of the input position by an electromagnetic induction method in a second mode. The touch panel includes scan line groups and source line groups, which are operated as touch electrodes or touch coils on the basis of the operating mode thereof. In addition, the touch panel includes touch electrodes and touch coils, which are individually operated on the basis of the operating mode thereof.