Display Fingerprint Sensor Support Using Hardness-Controlled Filler
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Solution Overview
Problem
The reliability of fingerprint sensors in display devices is compromised due to variations in signal attenuation caused by the physical properties of materials present between the display panel and the fingerprint sensor.
Innovation Solution
Incorporating a display device design with a metal plate and a filling member, where the filling member has a higher hardness than the bonding member, and a fingerprint sensor bonded to the filling member, along with a defined main and sub-region structure that includes a sheet hole exposing the inner side of the lower panel sheet, enhancing the sensor's reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple members are disposed between the display panel and the fingerprint sensor, then the structural complexity is increased, but the signal attenuation varies causing reliability degradation
Solution Approach 1:
The patent changes the physical parameters of the members between the display panel and fingerprint sensor, specifically controlling the thickness and material composition to optimize signal transmission. By adjusting these parameters, the signal attenuation is minimized while maintaining the necessary structural complexity for device functionality.
Solution Approach 2:
The patent employs composite material structures in the members disposed between the display panel and fingerprint sensor. By using composite materials with specific properties, the signal transmission is improved while the structural requirements are met, thus enhancing reliability without excessive complexity.
2Strength
If the hardness of the filling member is increased, then the protection of the fingerprint sensor is improved, but the bonding between the sensor and filling member may be compromised
Solution Approach 1:
The patent applies local quality by having different hardness levels in different regions or layers of the filling member structure. The filling member has a higher hardness region for protection and a softer bonding interface region for reliable attachment, thus resolving the contradiction between protection and bonding.
Solution Approach 2:
The patent uses composite material construction for the filling member, combining materials with different hardness properties. This allows the filling member to provide both mechanical protection through harder regions and reliable bonding through softer or more compliant regions.
Data Source
AI summary
A display device includes a display panel, a metal plate disposed on a bottom surface of the display panel and configured to support the display panel, a filling member disposed on the bottom surface of the display panel, the filling member being disposed on the same level as the metal plate relative to the bottom surface of the display panel, and a material of the metal plate being different from a material of the filling member, a fingerprint sensor disposed on a bottom surface of the filling member, and a member-sensor bonding member disposed between the fingerprint sensor and the filling member to bond the fingerprint sensor to the filling member. A hardness of the filling member is greater than a hardness of the member-sensor bonding member.