Flexible Circuit Board Integration for Under-Screen Fingerprint Sensors
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Solution Overview
Problem
The integration of under-screen fingerprint recognition technology in display panels is costly and labor-intensive due to the individual attachment process, which increases processing costs and reduces the available space for battery capacity and user experience.
Innovation Solution
A display assembly that incorporates a first flexible printed circuit with display signal lines and a fingerprint sensor, where the fingerprint recognition signal lines are segregated on a second flexible printed circuit, reducing the need for individual attachment and minimizing space occupation, allowing for improved heat dissipation and battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the fingerprint sensor is attached in individual process, then the under-screen fingerprint recognition function is achieved, but the processing cost increases and space is occupied
Solution Approach 1:
The patent merges the fingerprint sensor with the flexible printed circuit board by printing fingerprint recognition signal lines directly on the FPCB. This integration eliminates the need for separate attachment processes, reducing both processing cost and space occupation while maintaining the under-screen fingerprint recognition function.
Solution Approach 2:
The flexible printed circuit board is designed to serve multiple functions: it acts as both the circuit board for display signals and as the substrate for fingerprint recognition. By making the FPCB multi-functional, the patent reduces the need for separate components and attachment processes, thereby lowering processing cost and space requirements.
2Device complexity
If fingerprint recognition signal lines are arranged on the same FPCB as display signal lines, then the structure is simplified, but signal interference occurs
Solution Approach 1:
The patent segments the FPCB into distinct regions: one area for display signal lines and another area for fingerprint recognition signal lines. This spatial segmentation prevents signal interference while maintaining structural simplification by keeping all components on a single FPCB without requiring separate attachment processes.
Data Source
AI summary
A display assembly and a display apparatus. The display assembly comprises a display panel, a first flexible circuit board and a fingerprint sensor, wherein the first flexible circuit board is connected to the display panel in a binding manner and is positioned on the side of the display panel that faces away from a display surface; a display signal line coupled to the display panel is arranged on the first flexible circuit board; the fingerprint sensor is fixed on the side of the first flexible circuit board that is close to the display panel, and a light-sensitive surface of the fingerprint sensor is close to the display panel; and at least some sections of at least some fingerprint identification signal lines in fingerprint identification signal lines connected to the fingerprint sensor are arranged on the first flexible circuit board.