Under-screen Fingerprint Subpixel Scanning Frequency Control
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Solution Overview
Problem
In under-screen fingerprint recognition technology, display panels face challenges in maintaining high brightness for fingerprint recognition when in standby or static display modes, leading to slow brightness improvement and prolonged recognition response times.
Innovation Solution
The display panel employs working modes with different scanning frequencies, switching to a higher frequency when a fingerprint recognition requirement is detected, allowing for quicker brightness improvement of subpixels in the fingerprint recognition region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display panel uses a low scanning frequency in standby mode to reduce power consumption, then energy efficiency is improved, but the brightness improvement speed becomes slow when fingerprint recognition is needed
Solution Approach 1:
The display panel dynamically adjusts the scanning frequency based on the operational mode. In standby mode, it uses a first scanning frequency to save power. When fingerprint recognition is triggered, it switches to a second scanning frequency (higher than the first) to quickly improve brightness, thus adapting the system behavior to different operational requirements
Solution Approach 2:
The patent changes the scanning frequency parameter from a fixed value to a variable that can switch between at least two different frequencies. This parameter change allows the system to optimize between power consumption and brightness improvement speed by selecting the appropriate frequency based on the current operational state
2Measurement precision
If the display panel increases the scanning frequency to improve brightness quickly, then recognition precision is improved, but power consumption increases
Solution Approach 1:
The display panel uses periodic scanning at different frequencies depending on the operational phase. During normal operation, it scans at a lower frequency. When fingerprint recognition is needed, it periodically scans at a higher frequency to ensure sufficient brightness and recognition precision, then returns to the lower frequency after recognition is complete
Solution Approach 2:
The system dynamically switches between different scanning frequencies based on the operational state. It maintains low power consumption during standby by using the first frequency, and only increases to the second frequency when fingerprint recognition is triggered, thus achieving high recognition precision only when necessary
3Measurement precision
If the display panel maintains high brightness continuously for fingerprint recognition, then recognition precision is improved, but power consumption increases during standby mode
Solution Approach 1:
When a fingerprint recognition trigger is detected, the display panel preliminarily increases the scanning frequency to improve brightness before the actual recognition process begins. This preliminary action ensures that when recognition starts, the brightness is already sufficient, avoiding the need for continuous high brightness maintenance
Solution Approach 2:
The display panel serves its dual function of both display and fingerprint recognition light source efficiently. It maintains low power consumption during standby by using the first scanning frequency, and only activates the higher second frequency when fingerprint recognition is actually needed, making the system self-optimizing based on operational requirements
Data Source
AI summary
A method for driving a display panel and a display apparatus are provided. The display panel includes a display region including a fingerprint recognition region and includes subpixels located in the display region, and the subpixels include first subpixels located in the fingerprint recognition region and used as a light source for fingerprint recognition. In a first mode, the subpixels are scanned at a first frequency, and in the second mode, the subpixels are scanned at a second frequency. The second frequency is greater than the first frequency. The method includes: when the display panel is in the first mode, monitoring whether the display panel receives a fingerprint recognition requirement, and if yes, controlling the display panel to enter a trigger state; and when the display panel is in the trigger state, scanning the first subpixels at a frequency greater than the first frequency.