Single Chip Touch Sensing Enhancement via Fingerprint Data Fusion
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Solution Overview
Problem
Touch screens, particularly capacitive ones, face challenges in accurately distinguishing multi-touch inputs due to limitations in touch resolution and sensitivity to environmental noise, leading to incorrect touch events and suboptimal user experience.
Innovation Solution
A single chip solution that integrates a touch sensing module and a fingerprint sensing module to enhance touch sensing by generating output touch data based on both touch sensing data and fingerprint sensing data, improving accuracy through data fusion and resolution adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If capacitive touch screen is used, then user interaction is enabled, but touch resolution is much less than display resolution leading to inaccurate touch position detection
Solution Approach 1:
The patent merges the fingerprint sensing module and touch sensing module into a single integrated chip. The fingerprint sensing module provides high-resolution position data while the touch sensing module handles touch detection. By combining these two modules, the system achieves both ease of operation and improved measurement precision, as the fingerprint data supplements the low-resolution touch data to accurately determine touch positions and multi-touch events.
2Adaptability or versatility
If multi-touch function is implemented, then user interaction capability is enhanced, but fingers too close together cannot be distinguished causing incorrect touch events
Solution Approach 1:
The fingerprint sensing data acts as an intermediary that bridges the gap between touch sensor readings and actual user intent. When two fingers are close together, the touch sensor may read them as a single touch event, but the fingerprint sensor can detect the distinct pressure patterns and resolve them as separate touches, thereby improving the accuracy of touch event distinction while maintaining multi-touch functionality.
3Reliability
If touch sensing relies on environmental noise, then sensitivity is affected, but noise magnitude increases leading to reduced sensing accuracy
Solution Approach 1:
The patent converts the harmful environmental noise into a beneficial filtering opportunity. The fingerprint sensing module, which is less sensitive to environmental noise, provides a reference signal that can be used to filter and correct the touch sensing data. By using the fingerprint data as a reference, the system can identify and reject spurious touch events caused by environmental noise, thereby improving sensing stability and reducing the impact of harmful noise factors.
Data Source
AI summary
A method for touch sensing enhancement implemented in a single chip, a single chip capable of achieving touch sensing enhancement, and a computing apparatus are introduced. The single chip is used to be coupled to a display panel with a touch sensor and a fingerprint sensor. The computing apparatus may include the display panel, the single chip, and a processing unit, wherein the single chip is coupled between the display panel and processing unit. The method includes obtaining touch sensing data by a touch sensing module disposed within the single chip and coupled to the touch sensor; obtaining fingerprint sensing data by a fingerprint sensing module disposed within the single chip and coupled to the fingerprint sensor; and generating output touch data based on the touch sensing data and the fingerprint sensing data. With the contribution of the fingerprint sensing data, touch sensing enhancement can be achieved.