Integrated Fingerprint Sensing in Display Pixel Electrodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display devices require a separate fingerprint sensor outside the display panel, complicating manufacturing and constraining design due to the need for an external fingerprint detection mechanism.
Innovation Solution
Integration of a fingerprint-sensing circuit within the display panel, utilizing a pixel structure to detect fingerprints both capacitively and optically, eliminating the need for a separate sensor and allowing fingerprint recognition within the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate fingerprint sensor is provided outside the display panel, then fingerprint detection function is achieved, but device complexity and manufacturing complexity increase
Solution Approach 1:
The patent merges the fingerprint sensor with the display panel by integrating the sensing electrode into the display panel structure itself. The sensing electrode is formed in the same manufacturing process as the display panel electrodes, combining two previously separate components (display panel and fingerprint sensor) into a single integrated structure, thereby reducing device complexity and manufacturing complexity while maintaining fingerprint detection functionality
Solution Approach 2:
The display panel is designed to serve multiple functions: it acts as both the display component and the fingerprint sensing component. The sensing electrode integrated into the display panel enables the display panel to perform both visual display and biometric authentication functions, eliminating the need for a separate dedicated fingerprint sensor and reducing overall device complexity
2Reliability
If a separate fingerprint sensor is provided outside the display panel, then fingerprint detection function is achieved, but external area of display panel is enlarged
Solution Approach 1:
The fingerprint sensing function is merged into the display panel area itself rather than being placed externally. The sensing electrode is formed within the display panel structure, allowing fingerprint detection to occur within the existing display area boundaries, thus avoiding any enlargement of the external area while maintaining the fingerprint detection function
3Ease of manufacture
If pixel structure is used as fingerprint-sensing structure, then manufacturing process is simplified, but sensing precision may be compromised
Solution Approach 1:
The patent applies local quality by configuring the sensing electrode with specific local characteristics optimized for fingerprint sensing. The sensing electrode is positioned and dimensioned locally within the pixel structure to maximize capacitance change detection when a finger touches the screen, ensuring sufficient sensing precision while maintaining the manufacturing simplicity of using the existing pixel structure
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
Simplifies the manufacturing process, reduces device thickness, and enables fingerprint recognition without design constraints, allowing for intuitive user authentication within the display screen.
Implementation Method 1
a pixel electrode configured to detect a capacitance signal in response to a finger touching the display panel
Implementation Method 2
a light emitting unit configured to emit light towards the finger
Implementation Method 3
a light receiving unit configured to receive the light emitted from the light emitting unit after the light is reflected from the finger
Data Source
AI summary
The present disclosure relates to a display device, a display panel, a fingerprint-sensing method, and a circuit for sensing a fingerprint. More particularly, the display device, the display panel, the fingerprint-sensing method, and the circuit for sensing a fingerprint may receive a signal from a data line electrically connected to a pixel electrode through a switching transistor and may detect fingerprint information after a driving voltage is applied to the pixel electrode disposed in a pixel area, thereby detecting a fingerprint without including a separate fingerprint sensor outside a display panel.