Ultrasonic Fingerprint Sensor Light Shielding Sheet Design
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Solution Overview
Problem
In display modules using ultrasonic fingerprint identification technology, the attachment of a heat dissipation film with a metal layer causes light leakage and affects the integrated black effect, and the addition of a light shielding sheet to prevent this results in the sheet collapsing and contacting the sensor, thereby impairing identification performance.
Innovation Solution
A display module design featuring a heat dissipation film with a first opening for the ultrasonic fingerprint module and a light shielding sheet with a second opening that exposes the sensor, ensuring the light shielding sheet does not contact the sensor, thus maintaining identification performance and preventing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light shielding sheet is attached to the heat dissipation film to prevent light leakage, then the integrated black effect is improved, but the light shielding sheet collapses and contacts the sensor, impairing identification performance
Solution Approach 1:
The light shielding sheet is segmented into multiple parts: a first light shielding portion attached to the heat dissipation film, and a second light shielding portion extending from the first portion. This segmentation allows the sheet to maintain structural integrity and prevent collapse onto the sensor while still providing effective light shielding for the integrated black effect.
Solution Approach 2:
The second light shielding portion acts as an intermediary structural element that extends between the first light shielding portion and the sensor area. This intermediary structure provides mechanical support to prevent collapse while maintaining the light shielding function, thus resolving the contradiction between preventing light leakage and avoiding sensor contact.
2Object-affected harmful factors
If the light shielding sheet is attached to the entire opening of the heat dissipation film, then light leakage is prevented, but the sheet collapses due to thickness difference and gravity, contacting the sensor surface
Solution Approach 1:
The light shielding sheet is divided into a first light shielding portion for attaching to the heat dissipation film and a second light shielding portion extending from it. This segmentation creates a structural configuration where the second portion provides additional support to prevent collapse while maintaining coverage for light shielding.
Solution Approach 2:
The light shielding sheet extends in multiple dimensions: the first portion attaches to the heat dissipation film plane, while the second portion extends outward in a different dimensional direction. This multi-dimensional configuration provides structural rigidity against gravity while maintaining the light shielding function.
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 design prevents light leakage and maintains the integrated black effect while ensuring the ultrasonic fingerprint module's identification performance by avoiding contact between the light shielding sheet and the sensor, thereby enhancing the overall display module's functionality.
Implementation Method 1
ultrasonic fingerprint identification technology
Implementation Method 2
heat dissipation film disposed on a side of the display panel
Data Source
AI summary
A display module and a display device are disclosed. The display module includes a display panel, a heat dissipation film disposed on a side of the display panel facing away from a display side, and an ultrasonic fingerprint module. The heat dissipation film is provided with a first opening, and the ultrasonic fingerprint module includes a sensor disposed within the first opening and fixed on the side of the display panel facing away from the display side by a shading adhesive layer. The display module further includes a light shielding sheet attached on a side of the heat dissipation film facing away from the display panel. The light shielding sheet is provided with a second opening which exposes the sensor. An orthographic projection of the light shielding sheet and the shading adhesive layer on the display panel includes an orthographic projection of the first opening on the display panel.