Display Panel Fingerprint Recognition Noise Reduction
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Solution Overview
Problem
Existing display devices with optical fingerprint recognition technology face challenges in noise interference and accuracy due to the integration of photoelectric detection units in the display panel, leading to increased noise input and complexity, particularly in the narrow border area.
Innovation Solution
A display panel design featuring a plurality of fingerprint recognition units with photodiodes, switch modules, and touch-control electrodes, where each touch-control electrode corresponds to multiple fingerprint recognition units, connected to a driving circuit that controls signal input and output lines to improve signal-to-noise ratio and reduce line complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a passive detection circuit with selection switch and light-sensitive fingerprint sensor is used, then the structure is simple, but the ability to resist noise interference is poor
Solution Approach 1:
The patent divides the detection circuit into multiple independent pixel units, each with its own photodiode and transistor. This segmentation allows each pixel to be independently controlled and read, reducing the impact of noise on the overall system and improving signal-to-noise ratio while maintaining structural simplicity
Solution Approach 2:
The patent implements periodic scanning and reading of pixel signals through the selection switch. By periodically selecting and reading pixel signals in sequence, the system can distinguish between static noise and dynamic fingerprint signals, thereby improving noise resistance without complicating the circuit structure
2Adaptability or versatility
If the photoelectric detection unit is integrated into the display panel, then the fingerprint recognition function is added, but the input noise of driving circuit increases due to line length and crosstalk
Solution Approach 1:
The patent integrates the fingerprint detection function into the existing display panel structure by utilizing the pixel electrodes and signal lines already present in the display. This dimensional integration allows the fingerprint recognition function to be added without requiring separate dedicated lines, thereby reducing line length and crosstalk while maintaining full-screen fingerprint recognition capability
Solution Approach 2:
The patent makes the display panel pixels serve dual functions: both display function and fingerprint detection function. The same pixel electrodes and signal lines are used for both displaying images and detecting fingerprint patterns, eliminating the need for separate dedicated lines and reducing noise from crosstalk and line length
3Adaptability or versatility
If the photoelectric detection unit is integrated into the display panel, then the fingerprint recognition function is achieved, but the number of pins of driving chip increases
Solution Approach 1:
The patent merges the fingerprint detection signal lines with the existing display signal lines. The same data lines and gate lines used for driving display pixels are also used for reading fingerprint detection signals, thereby eliminating the need for separate dedicated pins and reducing the total pin count of the driving chip
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 enhances the accuracy of fingerprint recognition by reducing noise interference and line complexity, allowing for a narrower frame and improved signal-to-noise ratio, while also reducing the number of lines connected to the driving circuit.
Implementation Method 1
a light-sensitive fingerprint sensor detects the intensity of the light caused by the fluctuation of valleys and peaks of the fingerprint, thereby generating a fingerprint spectrum
Data Source
AI summary
Display panel, driving method, and display device are provided. The display panel includes first signal output lines, first signal input lines, fingerprint recognition units arranged in an array, touch-control electrodes arranged in an array, and a driving circuit. One touch-control electrode corresponds to at least two fingerprint recognition units, and is electrically connected to at least one first signal input line. One fingerprint recognition unit includes a photodiode, a first electrode, and a switch module. A first terminal of the photodiode is electrically connected to the switch module, a second terminal of the photodiode is electrically connected to a corresponding touch-control electrode, the switch module is electrically connected to a corresponding first signal output line, and the first electrode is electrically connected to the first terminal of the photodiode. The first signal output lines and the first signal input lines are electrically connected to the driving circuit.