Display Panel Frame Segmentation for Fast Fingerprint Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices with integrated light sensors face challenges in reducing the sensing time for user authentication functions, such as fingerprint sensing, which can prolong the overall operation time and affect display performance.
Innovation Solution
The display device incorporates a display panel with sub-pixels and light sensors, utilizing specific transistor configurations and timing control to separate data voltage writing and sensing signal reception into different frames, allowing for optimized operation and reduced sensing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the light sensor performs sensing operation within the same frame as data voltage writing, then the sensing time is reduced, but the display performance and image quality deteriorate due to interference between sensing and display operations
Solution Approach 1:
The patent divides the frame into two distinct parts: a first frame for display operations (writing data voltage to sub-pixels) and a second frame for sensing operations (reading sensing signals from light sensors). This temporal segmentation allows the display and sensing functions to operate independently without interference, resolving the contradiction between reducing sensing time and maintaining display performance.
Solution Approach 2:
The patent performs preliminary actions by writing data voltages to sub-pixels in the first frame before switching to sensing operations in the second frame. This ensures that display content is fully prepared and stabilized before the sensing operation begins, preventing any interference between display rendering and fingerprint sensing.
2Productivity
If the gate signal is applied to all pixel lines in the first frame for display scanning, then the display operation is completed, but the sensing area cannot be scanned in time for user authentication
Solution Approach 1:
The patent segments the pixel lines into two groups: those in the sensing area (from nth pixel line to mth pixel line) and those outside the sensing area. In the second frame, the gate signal is selectively applied only to pixel lines within the sensing area, enabling fast scanning for authentication while maintaining overall display productivity.
Solution Approach 2:
The patent applies different scanning strategies to different regions of the display panel. The sensing area receives intensive scanning with activation-level gate signals to enable fast authentication, while other areas follow standard display scanning protocols, optimizing both local sensing speed and overall system productivity.
3Reliability
If the emission signal is continuously applied to maintain display output, then the display performance is stable, but the power consumption increases during sensing operations
Solution Approach 1:
The patent uses periodic action by alternating between display mode (first frame with emission signals) and sensing mode (second frame without emission signals). During the sensing frame, the emission signal is not applied to pixel lines in the sensing area, reducing power consumption while maintaining display stability through the structured alternation of operational modes.
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 approach enhances the efficiency of user authentication by minimizing the sensing time without compromising display performance, enabling faster and more reliable fingerprint recognition.
Implementation Method 1
a light-receiving element connected to a control electrode of the first sensing transistor
Data Source
AI summary
A display device includes a display panel including a sub-pixel, and a light sensor for generating a sensing signal corresponding to an amount of received light, and a display panel driver for driving the display panel, for writing a data voltage to the sub-pixel in a first frame, and for receiving the sensing signal in a second frame.