Integrated Fingerprint Shielding Trace in Display Base Plate
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current fingerprint identification technologies in tablet devices, such as ultrasonic and optical methods, are costly, complex, and suffer from signal interference and stray light issues, which affect the accuracy and clarity of fingerprint imaging.
Innovation Solution
A displaying base plate with integrated fingerprint identifying units and displaying units, where each fingerprint identifying unit comprises a first electrode and a shielding trace insulated from each other, with the shielding trace connected to an earthed end, allowing for full-screen fingerprint identification and reduced mutual-capacitance interference, enhancing detection accuracy and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an independent fingerprint identification sensor is pasted to the non-displaying region, then fingerprint identification function is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the fingerprint identification function with the display panel by integrating fingerprint identifying units directly into the display base plate structure. The first electrode of the fingerprint identifying unit is formed in the same manufacturing process as the display electrode, eliminating the need for separate fingerprint sensors and reducing overall device complexity.
Solution Approach 2:
The display base plate is designed to serve multiple functions: it acts as both the display structure and the fingerprint identification structure. The first electrode serves dual purposes as both a display electrode and a fingerprint sensing electrode, achieving multi-functionality and reducing the need for additional components.
2Measurement precision
If ultrasonic or optical fingerprint identification techniques are used, then fingerprint identification accuracy is improved, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent combines fingerprint identification with the existing display manufacturing process. The first electrode is formed using the same thin-film transistor fabrication steps as the display, and the pixel defining layer serves dual purposes for both display and fingerprint identification, significantly reducing manufacturing cost and process complexity.
Solution Approach 2:
The existing display structure components (electrode, pixel defining layer) are utilized to provide fingerprint identification functionality without requiring additional dedicated structures. The display base plate itself serves as the fingerprint sensing platform, eliminating the need for separate fingerprint identification components.
3Area of stationary object
If fingerprint identifying units are integrated with displaying units, then full-screen fingerprint identification is achieved, but signal interference between units increases
Solution Approach 1:
The patent extracts the fingerprint identification function from the traditional separate sensor location and integrates it into the display area. By forming the first electrode of the fingerprint identifying unit within the pixel defining layer openings, the system achieves full-screen fingerprint coverage while maintaining signal integrity through proper electrical isolation.
Solution Approach 2:
The patent applies different structural configurations to different regions: the first electrode for fingerprint identification is formed in specific openings of the pixel defining layer, while the second electrode for display is formed in other openings. This local differentiation allows both functions to coexist with minimal interference.
4Measurement precision
If shielding trace is added to reduce mutual-capacitance interference, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The shielding trace is integrated into the existing manufacturing process as part of the pixel defining layer structure. The pixel defining layer simultaneously serves as both the display pixel boundary definition and the shielding structure for fingerprint identification, reducing overall device complexity while maintaining detection accuracy.
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
The solution enables high-accuracy full-screen fingerprint identification with improved display quality by integrating fingerprint and display units, reducing signal interference and simplifying the fabrication process while maintaining a cost-effective approach.
Implementation Method 1
each of the fingerprint identifying units comprises a first electrode and a shielding trace that are insulated from each other, an orthographic projection of the shielding trace on the substrate surrounds at least part of an orthographic projection of the first electrode on the substrate, and the shielding trace is electrically connected to an earthed end of the displaying base plate
Data Source
AI summary
A displaying base plate and a fabricating method thereof, and a displaying device. The displaying base plate includes: a substrate, and a plurality of displaying units and a plurality of fingerprint identifying units that are located on the substrate; each of the displaying units includes at least one sub-pixel; orthographic projections of the fingerprint identifying units on the substrate are separated from orthographic projections of the displaying units on the substrate; and each of the fingerprint identifying units includes a first electrode and a shielding trace that are insulated from each other, an orthographic projection of the shielding trace on the substrate surrounds at least part of an orthographic projection of the first electrode on the substrate, and the shielding trace is electrically connected to an earthed end of the displaying base plate.