Display Electrodes for Dual Magnetic and Capacitive Touch Detection
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Solution Overview
Problem
The existing touch detection systems for display apparatuses, such as electromagnetic induction and electrostatic capacitive systems, increase production costs due to the need for additional components like sensor plates and electrostatic electrodes, which can also lead to reduced touch detection sensitivity when these components are used in conjunction.
Innovation Solution
A display apparatus with a pair of first electrodes and a second electrode arranged in parallel, forming a coil to detect magnetic fields from external objects, while also utilizing these electrodes for electrostatic capacitance changes, thereby reducing the need for separate components and maintaining sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate sensor plates and electrostatic electrodes are added for touch detection, then touch detection function is achieved, but production cost increases
Solution Approach 1:
The patent makes the sensor plate serve dual functions: as the coil for electromagnetic induction system and as the electrostatic electrode for electrostatic capacitive system. This multi-functionality eliminates the need for separate components, reducing production cost while maintaining both touch detection functions.
Solution Approach 2:
The patent combines the sensor plate and electrostatic electrode into a single integrated component. By merging these previously separate elements, the structure is simplified and manufacturing cost is reduced while achieving both electromagnetic induction and electrostatic capacitive touch detection.
2Ease of manufacture
If sensor plate is used as electrostatic electrode, then production cost is reduced, but touch detection sensitivity deteriorates due to arrangement limitations
Solution Approach 1:
The patent applies different patterns to different regions of the sensor plate. The first region uses a pattern optimized for electromagnetic induction (e.g., coil winding pattern), while the second region uses a pattern optimized for electrostatic capacitance detection (e.g., interdigitated electrodes). This local differentiation ensures both functions achieve high sensitivity despite using the same physical plate.
Solution Approach 2:
The patent divides the sensor plate into multiple regions with different electrode patterns. By segmenting the plate into function-specific zones, each region can be optimized for its intended detection method, preventing the compromise in sensitivity that would result from a uniform design.
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 allows for effective touch detection by both pens and fingers, reducing production costs and maintaining sensitivity by utilizing the same electrodes for both magnetic field and electrostatic capacitance detection.
Implementation Method 1
a coil configured by the pair of first electrodes, so that a detection signal in accordance with a magnetic field from an external object is output to the detection circuit
Implementation Method 2
an electromagnetic induction system is known. In the electromagnetic induction system, high accuracy and high handwriting pressure detection accuracy can be achieved
Implementation Method 3
an electrostatic capacitive system utilizing a capacitance is cited. This electrostatic capacitive system has a relatively simple structure and less power consumption
Data Source
AI summary
A display apparatus capable of reducing the lowering of detection sensitivity is provided. A display apparatus provided with a pixel array having a plurality of pixels arranged in a matrix form includes: detection electrodes which are in parallel with each other, which are arranged so as to extend in a first direction, and which are connected so as to forma magnetic-field detection coil; and a detection electrode having one end which is arranged inside the magnetic-field detection coil and which is connected to the magnetic-field detection coil, and the other end which is electrically insulated from the magnetic-field detection coil. At the time of each of the magnetic field detection and the electric field detection, an external object is detected based on a change in a signal in the detection electrodes.