Voltage Sensing Fingerprint Sensor on Display Surface
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional active capacitive fingerprint recognition devices require an additional frame, which obstructs visibility on electronic product displays and increases manufacturing costs, limiting their application to specific locations.
Innovation Solution
A voltage sensing fingerprint recognition device with a substrate and sensor pads arranged in rows, where each row receives a trigger voltage that stops when the voltage receiver captures a sensing voltage value, allowing for enhanced fingerprint detection without an additional frame, using a sample-and-hold circuit or double correlated sampling circuit, and optionally an enhanced trigger voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional frame is used to provide sensing pads voltage, then fingerprint recognition function is achieved, but visibility of display surface is reduced and manufacturing cost increases
Solution Approach 1:
The patent merges the voltage supply function with the display surface itself. The sensing pads are integrated directly into the display surface, eliminating the need for a separate additional frame. The display surface serves dual purposes: as the visual display medium and as the voltage supply source for fingerprint sensing, thereby maintaining visibility while achieving fingerprint recognition functionality.
Solution Approach 2:
The display surface is given multiple functions: it serves both as the visual display interface and as the voltage supply source for the sensing pads. This multi-functionality eliminates the need for a separate frame structure, reducing manufacturing complexity and cost while maintaining the fingerprint recognition capability without obstructing visibility.
2Reliability
If an additional frame is used to provide sensing pads voltage, then fingerprint recognition function is achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines the voltage supply function with the display surface structure, eliminating the need for a separate additional frame. This integration reduces the number of components and assembly steps, thereby lowering manufacturing complexity and cost while maintaining the fingerprint recognition function.
Solution Approach 2:
The display surface performs multiple functions simultaneously: visual display and voltage supply for sensing. This multi-functionality removes the need for a dedicated frame structure, simplifying the manufacturing process and reducing overall manufacturing cost while preserving the fingerprint recognition capability.
3Reliability
If an additional frame is used to provide sensing pads voltage, then fingerprint recognition function is achieved, but the device is restricted to specific locations
Solution Approach 1:
The patent integrates the sensing pads directly into the display surface, eliminating the additional frame structure. This integration allows the fingerprint recognition function to be implemented on the display surface itself, enabling flexible application at various locations on electronic products without being constrained by the need for separate frame installations.
Solution Approach 2:
The display surface serves as both the visual display medium and the voltage supply source for fingerprint sensing. This multi-functionality enables the fingerprint recognition device to be applied to the display surface itself, providing location flexibility and adaptability across different electronic products without requiring additional frame structures.
4Reliability
If trigger voltage is continuously provided to sensing pads, then sensing capability is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic action by providing trigger voltage to sensing pads in a sequential manner row by row, rather than continuously. The voltage receiver captures sensing voltage values at specific moments when trigger voltage is applied to each row, and then stops the trigger voltage for that row. This periodic triggering maintains sensing capability while significantly reducing overall power consumption compared to continuous voltage supply.
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 fingerprint recognition on electronic product displays without additional frames, enhancing detection accuracy and reducing manufacturing costs while maintaining visibility.
Implementation Method 1
When a touch event occurs, the user's finger generates capacitance with the sensing pads
Implementation Method 2
the user's finger generates capacitance with the sensing pads
Data Source
AI summary
The invention provides a voltage sensing fingerprint recognition device and a fingerprint recognition method thereof. The voltage sensing fingerprint recognition device includes: a sensor arranged on a substrate, and the sensor including a plurality of sensing pads, the sensing pads respectively arranged in a plurality of rows, and each row having at least two sensing pads, each sensing pad receiving a trigger voltage; and a voltage receiver, electrically connected to each sensing pad; when the voltage receiver captures one sensed voltage value of the sensing pads in any row, the sensing pads in the row stop receiving the trigger voltage. The present invention does not require an additional frame, so it is applied to the display surface of electronic products.