Touch Screen Fingerprint Sensing Mode Switch
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Solution Overview
Problem
Mobile terminals with fingerprint sensors face issues with detecting fingerprints on touch screens without additional sensing layers, leading to unintended touch input detection and authentication activation.
Innovation Solution
An electronic device with a touch screen featuring a first area for touch input and fingerprint sensing, and a controller that switches the mode from touch receiving to fingerprint sensing, allowing higher resolution fingerprint detection without additional sensors, using a touch sensing module with electrode lines and dummy lines to differentiate between touch and fingerprint inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fingerprint sensing area is added to the touch screen, then fingerprint authentication capability is improved, but the touch input detection accuracy deteriorates due to the additional sensing layer
Solution Approach 1:
The touch screen is divided into multiple sensing areas, each capable of operating in different modes (touch receiving mode or fingerprint sensing mode). This segmentation allows the system to dedicate specific regions to fingerprint sensing while maintaining touch input detection in other regions, thereby improving fingerprint authentication capability without compromising overall touch input detection accuracy.
Solution Approach 2:
The sensing resolution of the first area is dynamically changed based on the operating mode. In touch receiving mode, the first area operates at a first sensing resolution optimized for touch input detection. When switched to fingerprint sensing mode, the sensing resolution is changed to a second sensing resolution optimized for fingerprint detection. This dynamic adjustment allows the same physical area to serve different functions with appropriate resolution characteristics.
2Measurement precision
If the sensing resolution of the first area is increased for fingerprint detection, then fingerprint detection precision is improved, but the touch input reception capability deteriorates in that area
Solution Approach 1:
The sensing resolution of the first area is dynamically adjusted based on the operating mode. When in touch receiving mode, the first area operates at a first sensing resolution optimized for touch input detection. When switched to fingerprint sensing mode, the sensing resolution is changed to a second sensing resolution optimized for fingerprint detection. This dynamic adjustment allows the system to optimize detection precision for the current function while maintaining the ability to receive touch inputs when needed.
Solution Approach 2:
Different areas of the touch screen are assigned different sensing resolutions based on their primary function. The first area can be configured with higher sensing resolution when dedicated to fingerprint sensing, while the second area maintains the first sensing resolution for touch input reception. This local differentiation ensures that each area has the appropriate resolution characteristics for its intended purpose.
3Adaptability or versatility
If an additional fingerprint sensor is added to the touch screen, then fingerprint authentication capability is improved, but the device complexity increases
Solution Approach 1:
The touch sensing module is designed to perform multiple functions: it can detect touch inputs and can also detect fingerprints. By enabling the touch sensing module to operate in both touch receiving mode and fingerprint sensing mode, the system eliminates the need for a separate dedicated fingerprint sensor, thereby improving fingerprint authentication capability while avoiding the increase in device complexity that would result from adding another sensor.
Solution Approach 2:
The fingerprint sensing functionality is merged with the existing touch sensing module. The controller switches the first area between touch receiving mode and fingerprint sensing mode, combining both functions within a single sensing module. This merging approach allows the system to achieve fingerprint authentication capability without adding separate hardware components, thus avoiding increased device complexity.
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 accurate fingerprint detection on a touch screen without additional sensors, preventing unintended touch input detection and allowing secure authentication by switching modes based on specific touch inputs.
Implementation Method 1
a touch sensing module for receiving a touch input at a first resolution in the touch receiving mode
Data Source
AI summary
The present invention comprises: a first region, having a display area for outputting images, for receiving touch input or acquiring fingerprint data by means of a touch entered on the display area; a touchscreen comprising a second region for receiving touch input; and a control unit for switching the first region from a touch receiving mode, which receives touch input, to a fingerprint sensing mode when a touch input is entered in the first region, wherein the touchscreen is provided with a touch sensor layer for receiving touch input at a first sense resolution in the touch receiving mode, and the control unit which, in the fingerprint sensing mode, switches the first region from the first sense resolution to a second sense resolution, which is higher than the former, so as to acquire fingerprint data, and maintains the second region at the first sense resolution so that the former receives touch input.