Capacitor Array Integration for Fingerprint Sensing in Display Screens
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Solution Overview
Problem
Capacitive fingerprint modules are difficult to integrate into display screens, limiting the screen-to-body ratio of mobile devices due to their independent nature.
Innovation Solution
Incorporating multiple capacitors into the display region of a display screen, each positioned between adjacent pixels, allowing for simultaneous fingerprint ridge and valley detection while maintaining normal display functionality, thus integrating fingerprint recognition into the display screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If capacitive fingerprint module is integrated into display screen, then screen-to-body ratio is increased, but device complexity increases
Solution Approach 1:
The patent merges the capacitive fingerprint sensing function with the display screen structure by integrating capacitor electrodes into the display layers. The first electrode is formed in the touch display panel and the second electrode is formed in the fingerprint sensing layer, creating a unified structure that performs both display and fingerprint recognition functions, thereby increasing screen-to-body ratio while managing complexity through functional integration.
Solution Approach 2:
The display screen is designed to serve multiple functions: it acts as both a display device and a fingerprint sensing device. The capacitor structure within the display screen enables it to perform capacitive sensing for fingerprint recognition, making the display screen a multi-functional component that eliminates the need for separate fingerprint modules and increases the screen-to-body ratio.
2Adaptability or versatility
If multiple capacitors are added to display region, then fingerprint recognition function is achieved, but manufacturing complexity increases
Solution Approach 1:
The fingerprint sensing area is divided into multiple discrete capacitor units, each corresponding to different sensing zones (such as ridge and valley detection areas). This segmentation allows the fingerprint sensing function to be achieved through an array of simple capacitor structures that can be manufactured using standard display fabrication processes, reducing overall manufacturing complexity while enabling sophisticated fingerprint recognition.
Solution Approach 2:
The capacitor electrodes for fingerprint sensing are integrated into the existing display manufacturing layers. The first electrode is formed during touch panel fabrication and the second electrode is formed during display assembly, merging the fingerprint sensing manufacturing steps with the display manufacturing process, thereby achieving fingerprint recognition function without significantly increasing manufacturing complexity.
3Adaptability or versatility
If capacitors are positioned between adjacent pixels, then display function and fingerprint recognition function are simultaneously achieved, but manufacturing precision requirements increase
Solution Approach 1:
The capacitor electrodes are positioned in specific locations between adjacent pixels where they serve dual purposes: maintaining display integrity and enabling fingerprint sensing. The first electrode is localized in the touch display panel and the second electrode is localized in the fingerprint sensing layer, with their overlapping regions creating capacitive sensing zones. This local positioning allows both display and fingerprint functions to coexist while using standard manufacturing tolerances.
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 enables both display and fingerprint recognition functions within the display region, increasing the screen-to-body ratio and improving fingerprint recognition clarity and efficiency.
Implementation Method 1
each capacitor is configured to generate a fingerprint ridge detection signal corresponding to a fingerprint ridge region or generate a fingerprint valley detection signal corresponding to a fingerprint valley region
Data Source
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AI summary
A display screen, an electronic device, and a fingerprint recognition method are provided in the present disclosure. The display screen has a display region. The display screen is provided with multiple pixels and multiple capacitors arranged at intervals in the display region. Each capacitor is corresponding to a region between two adjacent pixels. Each capacitor is configured to generate a fingerprint ridge detection signal corresponding to a fingerprint ridge region or generate a fingerprint valley detection signal corresponding to a fingerprint valley region. The display screen is provided with the multiple capacitors in the display region, and each capacitor is corresponding to the region between two adjacent pixels, so that the capacitor is independent of the pixel, which can ensure that the display screen can use multiple pixels for normal display, and the fingerprint ridge detection signal and the fingerprint valley detection signal can be sensed with aid of the multiple capacitors to realize user fingerprint image recognition. As such, both the display function and the fingerprint recognition function can be realized in the display region of the display screen, and a screen-to-body ratio is increased.