Foldable Input Sensor Driving Signal Control
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Solution Overview
Problem
Existing input sensors face errors in pressure touch recognition when folded, leading to incorrect detection of touch positions and intensities due to the application of driving signals during folding, which can result in false touch registrations.
Innovation Solution
Incorporating a sensor controller that selectively applies driving signals to pressure sensors based on folding states, determining folding angles and durations to prevent signal application during folding, and using additional pressure sensors to detect substrate or display device folding, ensuring accurate touch recognition only when unfolded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If driving signals are continuously applied to the pressure sensor, then the sensor can detect touch positions and intensities, but pressure touch recognition errors occur when the substrate is folded
Solution Approach 1:
The patent implements dynamic control of the driving signal application based on the substrate's folding state. The sensor controller monitors whether the substrate is folded and selectively applies driving signals only when the substrate is in an unfolded state, thereby adapting the sensor operation to the structural conditions and preventing false touch detections during folding.
Solution Approach 2:
The patent employs feedback mechanisms where the sensor controller receives information about the substrate's folding state (through folding detection signals from additional pressure sensors or folding detection modules) and adjusts the driving signal application accordingly. This closed-loop control ensures that driving signals are applied only when conditions are appropriate for accurate touch detection.
2Measurement precision
If the sensor controller monitors folding state to prevent signal application during folding, then touch recognition accuracy improves, but device complexity increases
Solution Approach 1:
The sensor controller is designed to perform multiple functions: it not only applies driving signals to the pressure sensor for touch detection but also monitors the substrate's folding state and controls the timing of signal application. By consolidating these functions into a single controller, the patent avoids adding separate monitoring systems and minimizes overall device complexity while achieving improved touch recognition accuracy.
3Measurement precision
If additional pressure sensors are used to detect folding, then folding state detection accuracy improves, but manufacturing cost increases
Solution Approach 1:
The patent utilizes the existing pressure sensor infrastructure to serve dual purposes: the primary pressure sensor detects user touches, while the same sensor (or additional sensors integrated into the same system) detects folding states by monitoring pressure changes characteristic of folding events. This self-service approach allows the system to leverage existing components for multiple functions, reducing the need for separate dedicated folding detection hardware and thereby controlling manufacturing costs.
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 solution reduces pressure touch recognition errors by controlling signal application during folding, ensuring accurate detection of touch positions and intensities only when the sensor or display device is in an unfolded state, thereby enhancing user interface execution and image display reliability.
Implementation Method 1
a first pressure sensor disposed on the substrate, and a sensor controller configured to apply a driving signal to the first pressure sensor and calculate a position and an intensity of a touch
Data Source
AI summary
An input sensor including a substrate, a first pressure sensor disposed on the substrate, and a sensor controller configured to apply a driving signal to the first pressure sensor and calculate a position and an intensity of a touch by using a first detection signal obtained from the first pressure sensor, in which the sensor controller is configured to not apply the driving signal to at least a portion of the first pressure sensor when the substrate is folded.