Sensor Layer Trace Switching for Touch and Pen Detection
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Solution Overview
Problem
Existing electronic devices lack efficient methods for distinguishing between touch inputs and pen inputs, particularly in multimedia devices, which hampers intuitive and precise input capabilities.
Innovation Solution
The electronic device incorporates a sensor layer with a specific electrode arrangement and trace line configuration, allowing it to operate in touch sensing and pen sensing modes, utilizing a sensor driver to apply distinct signals and switching transistors for effective input differentiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor layer is designed to sense touch inputs using conventional electrode arrangements, then touch sensing capability is achieved, but the ability to distinguish and sense pen inputs is insufficient
Solution Approach 1:
The sensor layer is segmented into multiple independent trace lines (first trace lines and second trace lines) that are selectively connected to different electrode groups. This segmentation allows the system to differentiate between touch inputs and pen inputs by directing signals through specific trace line paths, thereby achieving both precise measurement and input type versatility.
Solution Approach 2:
The trace lines are configured to be dynamically connected or disconnected from different electrode groups based on the detected input type. When a pen input is detected, the trace lines are connected to corresponding electrode groups to enable electromagnetic resonance sensing. This dynamic reconfiguration allows the same sensor layer to adapt its sensing characteristics for different input types, resolving the contradiction between measurement precision and adaptability.
2Device complexity
If the sensor layer uses a fixed electrode arrangement for touch sensing, then the structure is simple, but it cannot effectively sense pen inputs requiring electromagnetic resonance
Solution Approach 1:
The sensor layer is designed with universal trace lines that can serve multiple functions: touch sensing in conventional configurations and pen sensing when connected to resonant electrode groups. The same physical infrastructure (trace lines and electrodes) is reused for both touch and pen input detection, avoiding the need for separate dedicated structures and maintaining simplicity while achieving multi-functionality and reliable pen input sensing.
Solution Approach 2:
The trace lines are pre-configured with connection points to multiple electrode groups, allowing rapid switching between touch sensing mode and pen sensing mode. This preliminary arrangement of connection paths enables the system to quickly reconfigure for electromagnetic resonance sensing when a pen input is detected, without requiring complex real-time routing decisions, thus maintaining structural simplicity while ensuring reliable pen input detection.
3Measurement precision
If trace lines are electrically isolated for touch sensing mode, then touch input accuracy is maintained, but pen input sensing requiring electrical connection is prevented
Solution Approach 1:
The electrical isolation state of the trace lines is dynamically adjusted based on the detected input type. For touch inputs, the trace lines maintain their isolated state to preserve measurement accuracy. For pen inputs, the trace lines are dynamically connected to the corresponding electrode groups to enable electromagnetic resonance. This dynamic state change allows the system to maintain touch input accuracy while enabling seamless switching to pen input sensing mode.
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
Enables seamless switching between touch and pen inputs, enhancing user interaction precision and intuitiveness in multimedia devices.
Implementation Method 1
The sensor layer may sense a touch of a user or pressure made by the user
Implementation Method 2
the second mode may include a pen sensing driving mode, and the sensor driver may receive an induced current from the plurality of first electrodes and the plurality of second electrodes
Data Source
AI summary
An electronic device includes a sensor layer, and a sensor driver operating in a first mode for sensing a touch input or a second mode for sensing a pen input. The sensor layer includes a plurality of first electrodes, a plurality of second electrodes, a plurality of first trace lines connected to first end portions of the plurality of first electrodes, a plurality of second trace lines connected to the plurality of second electrodes, respectively, and a plurality of third trace lines connected to second end portions spaced apart in the second direction from the first end portions of the plurality of first electrodes. The plurality of third trace lines are isolated from each other in the first mode, the second mode includes a charging driving mode, and at least some of the plurality of third trace lines are connected to each other in the charging driving mode.