PCB Sensor Layout with Dummy Structure for Stable Sensing
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Solution Overview
Problem
The durability of display devices, such as LCD and OLED devices, is compromised when various sensors are integrated, leading to unstable sensing distributions and decreased yield and lifespan due to inadequate support of touch sensors.
Innovation Solution
A printed circuit board (PCB) package is designed with an insulating base, where a pressure sensor overlaps the display panel, and a fingerprint sensor is spaced apart with a dummy structure between them, ensuring stable placement and reduced sensing distribution issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If various touch sensors are integrated into the display device, then the sensing functionality is enhanced, but the durability and stability of the display device decrease
Solution Approach 1:
A dummy structure is introduced as an intermediary element between the pressure sensor and fingerprint sensor on the PCB. This dummy structure acts as a mediator that stabilizes the sensing distribution by providing a reference structure that compensates for variations in sensor placement and environmental factors, thereby maintaining reliability while preserving enhanced sensing functionality
Solution Approach 2:
The patent modifies the physical parameters of the PCB layout by positioning the pressure sensor at a specific distance from the edges and introducing a dummy structure with controlled dimensions. These parameter changes optimize the sensing distribution characteristics, ensuring stable performance across different operating conditions while maintaining the integrated sensor functionality
2Device complexity
If sensors are closely positioned on the PCB, then the device complexity is reduced, but the sensing distribution becomes unstable
Solution Approach 1:
The patent employs asymmetric positioning of the pressure sensor relative to the PCB edges, with different distances specified for different edges. This asymmetric arrangement, combined with the dummy structure, creates an optimized sensing distribution pattern that maintains stability while allowing compact sensor integration, thus reducing device complexity without compromising sensing stability
3Manufacturing precision
If the pressure sensor is positioned closer to the edges of the insulating base, then the manufacturing precision is improved, but the sensing sensitivity decreases
Solution Approach 1:
The patent specifies optimized distance parameters between the pressure sensor and the edges of the insulating base, as well as controlled dimensions for the dummy structure. These parameter changes balance manufacturing precision requirements with sensing sensitivity needs, ensuring that sensors can be accurately positioned while maintaining optimal sensing performance
Data Source
AI summary
A display device includes a display panel and a printed circuit board (PCB) connected to the display panel. The PCB includes an insulating base. A pressure sensor is disposed to overlap with the display panel. A fingerprint sensor is disposed to overlap with the display panel and is spaced apart, on a first side in a first direction, from the pressure sensor. A first distance from the pressure sensor to a first edge of the insulating base is greater than a second distance from the pressure sensor to a second edge of the insulating base opposite the fingerprint sensor.