E-Paper Touch Signal Voltage Control for Frame Noise
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Solution Overview
Problem
Integrating touch technology with electrophoretic ink displays in electronic paper devices leads to signal coupling issues on the Thin Film Transistor (TFT), causing problems like broken lines during writing or drawing due to noise interference from frame changes.
Innovation Solution
A controlling circuit adjusts the driving voltage of the active pen and touch module signals based on noise interference detection, using methods like spatial-to-frequency transformation and capacitance analysis to enhance the signal-to-noise ratio (SNR) and resolve detection issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch technology is integrated with electrophoretic ink display, then interactivity is enhanced, but signal coupling noise occurs on TFT causing broken lines during writing
Solution Approach 1:
The patent implements dynamic driving voltage adjustment based on real-time noise detection. The controlling circuit monitors noise levels from the touch module and adjusts the driving voltage of the active pen accordingly, transitioning from static to dynamic operation to resolve the contradiction between interactivity and signal quality
Solution Approach 2:
The patent changes the electrical parameter (driving voltage) of the active pen based on detected noise conditions. By adjusting the voltage level dynamically, the system maintains reliable touch signals while preserving the enhanced interactivity feature
2Measurement precision
If driving voltage is increased to improve signal strength, then touch detection accuracy improves, but power consumption increases
Solution Approach 1:
The system dynamically adjusts driving voltage based on real-time noise detection rather than maintaining a constant high voltage. This allows the system to achieve accurate touch detection when needed while reducing power consumption during normal operation
Solution Approach 2:
The patent implements variable voltage operation where the driving voltage parameter is changed based on detected noise conditions. This resolves the contradiction by applying higher voltage only when necessary for accurate detection, rather than continuously
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 effectively mitigates noise interference, ensuring accurate touch detection and reducing power consumption by dynamically adjusting the driving voltage in response to frame changes.
Implementation Method 1
Electrophoretic Ink technology operates on the principle of electrophoresis, where charged particles move towards a positive or negative pole under the influence of an electric field
Implementation Method 2
The Back Plane includes a Thin Film Transistor (TFT) array, used to control the electric field of each pixel
Implementation Method 3
The controlling circuit is configured to control the touch module to emit an uplink signal to an active pen which is configured to emit a downlink signal to the touch module
Data Source
AI summary
This disclosure relates to a display device including a display, a touch module, and a controlling circuit. The controlling circuit determines whether a noise interference phenomenon occurs on the touch module due to the display showing multiple frames. If the noise interference phenomenon occurs, the controlling circuit sets that an uplink signal or a downlink signal is generated by a first driving voltage. If no noise interference phenomenon occurs, the uplink signal or the downlink signal is generated by a second driving voltage, where the first driving voltage is greater than the second driving voltage.