Display Input Sensing Circuit for Fingerprint Recognition Visibility
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Solution Overview
Problem
Conventional input sensing circuits for fingerprint recognition on display devices face challenges in improving visibility of the image displayed while maintaining effective fingerprint recognition, particularly in the context of increased security demands for mobile devices.
Innovation Solution
The proposed solution involves a display module with a circuit configuration that includes a display panel with specific light emitting areas and a sensing circuit with a unique electrode structure, utilizing multiple scan lines and sensors to form capacitances with fingerprint ridges and valleys, allowing for efficient fingerprint recognition without impairing image visibility. This configuration includes a transparent electrode that forms capacitances with the fingerprint and uses different wavelengths of light to enhance recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional input sensing circuit is used for fingerprint recognition, then fingerprint recognition capability is provided, but image visibility on the display is reduced
Solution Approach 1:
The sensing circuit is divided into multiple independent sensors arranged in an array, with each sensor capable of detecting capacitance changes independently. This segmentation allows the system to maintain comprehensive fingerprint recognition coverage while optimizing individual sensor performance for both visibility and recognition accuracy.
Solution Approach 2:
The display panel serves dual functions as both the visual display component and the fingerprint sensing component. The same display structure that emits light for visibility also contains the sensing circuitry for fingerprint recognition, eliminating the need for separate components and resolving the contradiction between visibility and recognition capability.
2Reliability
If the sensing circuit is added to improve security, then fingerprint recognition is enabled, but the display quality and visibility are impaired
Solution Approach 1:
The fingerprint sensing circuit is merged with the display panel structure, combining security functionality with the existing display infrastructure. This integration ensures that security features do not compromise display quality, as both functions share the same physical structure and resource base.
Solution Approach 2:
The display panel itself serves the dual purpose of providing visual output and fingerprint sensing capabilities. The display structure automatically performs both functions without requiring additional external components that would interfere with display quality, thereby maintaining visibility while enabling security features.
3Measurement precision
If multiple sensors are used to enhance fingerprint recognition accuracy, then recognition reliability improves, but device complexity increases
Solution Approach 1:
The fingerprint sensing area is segmented into multiple discrete sensors arranged in a systematic array pattern. This segmentation enables precise localization and measurement of capacitance changes across different regions of the fingerprint, improving recognition accuracy while maintaining manageable circuit complexity through modular architecture.
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 improves the visibility of the image displayed on the device while maintaining or enhancing the ability to recognize fingerprints, addressing the security and usability concerns of mobile devices by providing a robust fingerprint recognition system.
Implementation Method 1
The transparent electrode overlaps with the first electrode, the first light emitting area, the second light emitting area, and the third light emitting area... The third electrode may be configured to form a capacitance with an external object... The transparent electrode may be configured to form a capacitance with a fingerprint of a finger
Data Source
AI summary
An input sensing circuit includes a plurality of sensors to sense a touch event and to recognize a fingerprint. Among the sensors, at least one sensor includes two transistors and one capacitor. One electrode of electrodes of the capacitor makes contact with a finger of a person to form a capacitance, and the input sensing circuit senses the capacitance to sense the touch event and to recognize the fingerprint.