In-Display Fingerprint Sensing Timing Control via Skip Periods
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In-display fingerprint sensing technologies face challenges in arranging the timing of display driving, touch sensing, and fingerprint sensing operations due to interference between these functions, which affects the efficiency and quality of fingerprint sensing.
Innovation Solution
A driving apparatus with separate first and second driving circuits, where the first circuit suspends display or touch sensing operations during a skip period and the second circuit performs fingerprint sensing during this time, allowing for precise timing control between these operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If fingerprint sensor array is embedded in display panel (in-display fingerprint sensing), then thickness of display apparatus is reduced, but operation of fingerprint sensing function is influenced/interfered by display function and/or touch sensing function
Solution Approach 1:
The patent divides the operation time into distinct periods: display driving periods, touch sensing periods, and fingerprint sensing periods. The fingerprint sensor array and display pixel array operate independently in different time slots, eliminating mutual interference while maintaining the in-display integration for reduced thickness.
Solution Approach 2:
The patent implements periodic operation cycles where the fingerprint sensing function is activated during specific skip periods when the display and touch sensing are suspended. This periodic timing arrangement ensures that fingerprint sensing occurs without interference from other functions, resolving the reliability issue while preserving the thin form factor.
2Productivity
If fingerprint sensing operation is performed simultaneously with display driving operation, then operation efficiency is improved, but interference between functions increases and affects fingerprint sensing quality
Solution Approach 1:
The patent dynamically adjusts the operation schedule by introducing skip periods where display driving is suspended to allow fingerprint sensing. This dynamic timing adjustment ensures high-quality fingerprint sensing when needed, while maintaining overall system productivity through efficient use of time slots.
Solution Approach 2:
The patent employs skip periods where the display driving operation is temporarily suspended to prioritize fingerprint sensing operations. This skipping mechanism ensures that fingerprint sensing quality is not compromised by simultaneous display operations, while the overall system remains productive by quickly transitioning between operation modes.
3Measurement precision
If skip period is extended to allow complete fingerprint sensing operation, then fingerprint sensing quality is improved, but display refresh rate and user experience are degraded
Solution Approach 1:
The patent applies partial action by suspending display driving only during specific skip periods needed for fingerprint sensing, rather than extending the skip period to cover the entire frame cycle. This approach achieves sufficient fingerprint sensing quality while minimizing impact on display refresh rate and user experience.
Solution Approach 2:
The patent adjusts the duration and frequency of skip periods based on the specific fingerprint sensing requirements. By dynamically changing the timing parameters, the system achieves optimal fingerprint sensing quality while maintaining acceptable display performance, balancing both requirements through parameter optimization.
Data Source
AI summary
A driving apparatus and an operation method thereof are provided. The driving apparatus includes a first driving circuit and a second driving circuit. The first driving circuit suspends performing at least one of a display driving operation and a touch sensing operation during a skip period under a driving mode, and the first driving circuit performs the at least one of the display driving operation and the touch sensing operation outside the skip period under the driving mode. The second driving circuit is coupled to the first driving circuit. The second driving circuit performs a fingerprint sensing operation during the skip period.