Display Panel Metal Plate Layout for Fingerprint Sensor Stability
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Solution Overview
Problem
Display devices experience structural deformation due to thermal expansion of filling members in metal plates, which can compromise the integrity and functionality of fingerprint sensors.
Innovation Solution
The display device incorporates a metal plate and a filling member on the same layer with different materials, featuring specific geometric patterns and configurations to accommodate thermal expansion, with a fingerprint sensor positioned beneath the filling member, enhancing structural stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a filling member is used to fill a through hole in a metal plate, then the structural integrity is improved, but thermal expansion causes structural deformation
Solution Approach 1:
The metal plate is divided into multiple segments or sections, allowing each segment to expand independently during thermal cycles. This segmentation prevents cumulative stress and deformation that would occur in a solid, continuous structure, thereby maintaining structural integrity while accommodating thermal expansion of the filling member.
Solution Approach 2:
The invention changes the physical parameters of the metal plate, specifically its geometric configuration and material properties, to accommodate thermal expansion. By adjusting parameters such as plate thickness, hole distribution, and material thermal conductivity, the structure can withstand temperature variations without deforming, thus resolving the contradiction between strength and stability.
2Adaptability or versatility
If different materials are used for the metal plate and filling member, then functional requirements are met, but material incompatibility during thermal expansion occurs
Solution Approach 1:
The invention applies local quality by selecting specific materials for the metal plate and filling member based on their local functional requirements. The metal plate is chosen for structural support and thermal management, while the filling member is selected for its electrical or thermal conductivity properties. This localized material selection ensures that each component performs its specific function while maintaining overall system reliability.
Solution Approach 2:
The invention uses composite material structures where the metal plate and filling member are designed as a combined system. By carefully selecting compatible material pairs and designing their geometric relationship, the structure accommodates differential thermal expansion between materials, preventing stress concentration and maintaining reliability across temperature ranges.
3Ease of operation
If the fingerprint sensor is positioned beneath the filling member, then authentication functionality is enabled, but thermal stress from the filling member may affect sensor performance
Solution Approach 1:
The invention introduces an intermediary layer or structural design between the filling member and the fingerprint sensor. This intermediary element acts as a thermal buffer, isolating the sensor from direct thermal stress while allowing the filling member to expand freely. This maintains authentication functionality by keeping the sensor operational despite temperature variations in the surrounding structure.
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
This configuration mitigates structural deformation, ensuring the reliability and functionality of fingerprint sensors by managing thermal expansion effectively.
Implementation Method 1
improves structural deformation due to thermal expansion of a filling member filling a through hole of a metal plate
Data Source
AI summary
A display device includes a display panel; a metal plate and a filling member which are disposed on a lower surface of the display panel, are disposed on the same layer, and include different materials; and a fingerprint sensor which is disposed on a lower surface of the filling member and is overlapped by the filling member in a thickness direction, wherein the metal plate includes a plurality of outlines extending in different directions in plan view, one outline of the metal plate includes a plurality of sides extending along a first direction and a discontinuous part disposed between the sides, an open part recessed from the discontinuous part in a second direction intersecting the first direction is formed in the metal plate, and the filling member is located in the open part in plan view.