Display Touch and Fingerprint Sensing for Ghost Touch Detection
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Solution Overview
Problem
Display devices suffer from ghost touches, which are unintended user inputs sensed by the sensor component, leading to inaccurate touch detection.
Innovation Solution
A display device with a sensor component overlapping the display component, featuring first and second sensor drivers and a processor to differentiate between real and ghost touches by using detection and sensing data from touch and fingerprint sensors, respectively, and a communication line for data exchange between drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor component is used to sense touch input, then touch detection capability is provided, but ghost touches (unintended inputs) are also sensed leading to inaccurate detection
Solution Approach 1:
The patent combines two different sensing mechanisms (capacitive touch sensing and optical fingerprint sensing) into a single integrated sensor component. The photo sensors serve dual functions: detecting touch events through light reflection changes and capturing fingerprint patterns. This merging allows the system to differentiate between genuine touches and ghost touches by cross-validating data from both sensing modes, thereby improving both measurement precision and reliability.
Solution Approach 2:
The patent introduces photo sensors as an intermediary element that mediates between the touch surface and the detection system. These photo sensors act as intermediaries that can detect both mechanical touch events and optical fingerprint patterns. By using this intermediary, the system can verify touch authenticity through multiple detection pathways, reducing false positives from ghost touches while maintaining accurate genuine touch detection.
2Adaptability or versatility
If photo sensors are used for fingerprint sensing, then biometric authentication is enabled, but touch sensing capability during other time periods may be affected
Solution Approach 1:
The patent implements periodic action by alternating between fingerprint sensing mode and touch sensing mode in time-division multiplexing fashion. During specific time intervals, photo sensors are activated for fingerprint capture, while during other intervals, they switch to touch detection mode. This periodic switching allows the system to perform both functions using the same hardware without compromising the precision of either function, as each sensor operates optimally during its designated time slot.
Solution Approach 2:
The patent applies dynamics by making the sensor configuration adaptive and changeable over time. The system dynamically adjusts the operating mode of photo sensors based on current operational requirements - switching between fingerprint sensing and touch sensing modes as needed. This dynamic reconfiguration enables the system to maintain high measurement precision for both functions by optimizing sensor operation for the specific task being performed at each moment.
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
Enhances touch detection accuracy by distinguishing real touches from ghost touches, ensuring reliable user input recognition.
Implementation Method 1
photo sensors sense the touch of the object during a first sensing section, sense a fingerprint of a user during a second sensing section
Data Source
AI summary
Provided herein may be a display device including: a display component comprising pixels and photo sensors; a sensor component provided to at least partially overlap the display component, and including sensors; a first sensor driver configured to drive the sensor component, sense a touch of an object, and generate detection data; a second sensor driver configured to drive the photo sensors, sense the touch of the object during a first sensing section, sense a fingerprint of a user during a second sensing section, and generate sensing data; and a processor configured to determine whether the touch of the object is present using the detection data and the sensing data.