Sensor Panel Segmentation for Fingerprint Recognition
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Solution Overview
Problem
Fingerprint sensors face challenges in maintaining drawing performance and design freedom due to issues with conductive line patterns and alignment during the assembly of sensor panels, leading to potential misalignment and distortion, which affects the recognition rate and quality of the sensor panel.
Innovation Solution
The electronic device incorporates a sensor panel design with a first sensor panel and a second sensor panel, where the second sensor panel includes a first circuit board and a second circuit board spaced apart to form a receiving space, with conductive lines formed in a straight-line pattern to ensure drawing linearity and quality, and a fixing holder member to secure alignment, allowing for automatic reflection of tilt angle deviations in firmware for improved user environment performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive lines are formed in a bypass pattern to connect the first and second sensor panels, then electrical connection is achieved, but drawing linearity and quality deteriorate due to broken or distorted lines
Solution Approach 1:
The sensor panel is divided into a first sensor panel and a second sensor panel that are separately manufactured and then assembled together. This segmentation allows each panel to be produced with high drawing linearity using straight-line conductive lines, while the bypass connection is achieved through the assembly structure rather than continuous conductive lines.
Solution Approach 2:
A fixing holder member is introduced as an intermediary component to attach the second sensor panel to the first sensor panel. This mediator enables electrical connection and mechanical alignment without requiring the conductive lines to bend or distort, thus preserving drawing linearity while achieving reliable connection.
2Ease of manufacture
If the second sensor panel is attached to the first sensor panel in two steps, then assembly is completed, but misalignment and distortion occur due to waving on the surface
Solution Approach 1:
The fixing holder member is designed with pre-formed attachment structures that enable the second sensor panel to be attached to the first sensor panel in a single step with high precision. This preliminary preparation of the fixing structure eliminates the need for multi-step assembly and prevents misalignment and distortion that would otherwise occur during sequential attachment.
3Reliability
If a large-sized fingerprint sensor is used to increase recognition rate, then the opening area of the sensor panel must be enlarged, but this increases the complexity of maintaining drawing performance
Solution Approach 1:
The sensor panel is segmented into multiple panels, allowing the overall system to achieve a large effective area for high recognition rate while each individual panel maintains a manageable size with excellent drawing performance. The segmentation enables straight-line conductive lines in each panel without requiring excessive enlargement of any single panel's opening area.
Data Source
AI summary
An electronic device is provided, which includes a housing, a display, and a sensor panel that is disposed between the display and the housing and that senses input information of a stylus pen, in which the sensor panel includes a first sensor panel including an opening area and a second sensor panel disposed to cover at least part of the opening area and electrically connected with the first sensor panel, and the second sensor panel includes a first circuit board including a first sub-board and a second sub-board, at least part of the first sub-board and at least part of the second sub-board being spaced apart from each other to form a receiving space and a second circuit board, at least part of which being accommodated in the receiving space and surrounded by the first circuit board.