Fingerprint Sensor Integrated with Display and Touch Sensors
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Solution Overview
Problem
The integration of touch sensing and fingerprint recognition functions in electronic devices poses challenges due to space restrictions and the need for separate hardware, leading to increased costs and complexity.
Innovation Solution
An electronic device design that incorporates a fingerprint sensor on the front face of a display, integrated with a touch sensor and pressure sensor, allowing for reduced space requirements and shared control circuits, enabling both functions to be performed with a single control circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a fingerprint sensor is integrated with a display device, then the space requirements are reduced and the structure is simplified, but the fingerprint sensor requires a separate space and hardware structure that is distinct from the display
Solution Approach 1:
The patent combines the fingerprint sensor and display into a single integrated structure where the fingerprint sensor is disposed on the front face of the display. The control circuit is shared between both functions, merging what would traditionally be separate hardware systems into one unified device that reduces overall space requirements while maintaining distinct functional capabilities.
Solution Approach 2:
The control circuit is designed to perform multiple functions - it controls both the display and the fingerprint sensor operations. This multi-functional approach allows a single control circuit to manage different sensor types (touch sensing and fingerprint recognition) without requiring separate dedicated circuits for each function.
2Adaptability or versatility
If touch sensing and fingerprint recognition functions are individually implemented, then each function can be optimized for specific situations, but additional cost is incurred for each function
Solution Approach 1:
The control circuit is designed as a universal controller that can handle both touch sensing and fingerprint recognition functions. This single control circuit replaces what would traditionally require separate dedicated circuits, reducing component count and manufacturing cost while preserving the ability to optimize each function's performance through software or control logic within the unified circuit.
Solution Approach 2:
The patent merges the control circuits for touch sensing and fingerprint recognition into one shared control circuit. This consolidation reduces the total number of components needed, lowering manufacturing costs, while the control circuit maintains the capability to independently process and optimize each function's specific requirements through integrated control logic.
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
This design reduces space constraints and costs by integrating sensors within the display structure, enhancing user input capabilities while maintaining accurate fingerprint recognition and touch sensing.
Implementation Method 1
a capacitive-type fingerprint recognition sensor acquires a pattern of a fingerprint by detecting a change in capacitance depending on the shapes of ridges and valleys of the fingerprint
Implementation Method 2
a transparent cover that forms at least a portion of the first face, a display disposed between the first face and the second face of the housing and exposed through the transparent cover
Data Source
AI summary
An electronic device is provided which includes a housing including a first face that faces a first direction and a second face that faces a second direction, which is opposite to the first direction, the housing including a transparent cover that forms at least a portion of the first face, a display disposed between the first face and the second face of the housing and exposed through the transparent cover, a fingerprint sensor disposed between the transparent cover and the display, a touch sensor disposed between the fingerprint sensor and the display, and a pressure sensor disposed between the display and the second face of the housing.