Under-screen Fingerprint Sensor Power Management via Pressure Trigger
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Under-screen fingerprint detection in display devices consumes excessive power and is prone to misoperation due to unnecessary activation of the fingerprint unlocking function when pressure is not from a finger, and existing solutions are costly and occupy internal space.
Innovation Solution
A display device integrating a pressure sensor and a skin texture sensor with a controller to detect pressing actions and awaken the skin texture sensor only when a human body is detected, reducing power consumption and avoiding misoperations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the skin texture sensor is continuously activated for under-screen fingerprint detection, then the fingerprint recognition function is always available, but the power consumption increases excessively
Solution Approach 1:
The patent implements periodic action by using the pressure sensor to trigger intermittent activation of the skin texture sensor. Instead of continuous operation, the system periodically checks for pressing actions through the pressure sensor and only activates the power-consuming skin texture sensor when actually needed, thereby reducing overall power consumption while maintaining fingerprint recognition availability.
2Speed
If the skin texture sensor is activated by any pressing action, then the response speed is fast, but misoperations occur when pressure is not from a finger
Solution Approach 1:
The patent applies feedback by using the pressure sensor as a preliminary detection mechanism that provides feedback signals to the controller. When the pressure sensor detects a pressing action, it triggers the skin texture sensor to activate and capture fingerprint information. This feedback-based two-stage detection ensures fast response while preventing misoperations, as the system only proceeds to fingerprint recognition when actual finger contact is confirmed.
3Measurement precision
If additional sensors are added to improve detection accuracy, then the measurement precision increases, but the device complexity and internal space occupation increase
Solution Approach 1:
The patent implements multi-functionality by designing the pressure sensor to serve dual purposes: it acts as both a touch detection sensor for user interaction and a trigger mechanism for activating the skin texture sensor. This universal approach allows the system to use existing sensor infrastructure for multiple functions, thereby improving detection precision without proportionally increasing device complexity or internal space occupation.
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 reduces power consumption by activating the skin texture sensor only when a valid pressing action from a human body is detected, enhancing the accuracy and efficiency of under-screen fingerprint recognition.
Implementation Method 1
the pressure sensor is configured to detect a pressing action on a display side of the display panel
Implementation Method 2
the skin texture sensor is configured to detect a skin texture image of a user touching the display side of the display panel
Implementation Method 3
the pressure sensor comprises a first electrode, a piezoelectric material layer and a second electrode, and the first electrode, the piezoelectric material layer and the second electrode are sequentially stacked on the surface of the display side of the display panel
Data Source
AI summary
A display device and an operation method thereof are disclosed. The display device includes a display panel, a pressure sensor, a skin texture sensor, and a controller. The skin texture sensor and the pressure sensor are respectively coupled to the controller; the pressure sensor is configured to detect a pressing action on a display side of the display panel; the skin texture sensor is configured to detect a skin texture image of a user touching the display side of the display panel; and the controller is configured to awaken the skin texture sensor when the pressure sensor detects the pressing action. The display device reduces power consumption of the fingerprint detection.