Display Optical Fingerprint Sensor Openings for Light and Heat
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Solution Overview
Problem
The integration of an optical fingerprint sensor in a display device, such as an OLED display, is hindered by reduced light transmittance and heat dissipation due to multiple layers between the display panel and the sensor, which affects fingerprint recognition rate and heat management.
Innovation Solution
Incorporating a patterned film with an opening portion, a heat dissipating layer with larger openings, and a cushion layer to absorb impact, all positioned to expose the optical fingerprint sensor, along with an embossing layer to enhance light transmission and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple layers are disposed between the display panel and the optical fingerprint sensor, then the structural integrity and protection are improved, but the transmittance of light reaching the optical fingerprint sensor is reduced
Solution Approach 1:
The embossing layer is designed with a specific refractive index (1.4-1.6) that differs from surrounding layers, creating local optical property variations. This local quality change enables enhanced light transmission through the layer stack at the fingerprint sensor region while maintaining protective coverage elsewhere.
Solution Approach 2:
The embossing layer introduces parameter changes in refractive index and physical structure (embossed patterns) to optimize light transmission. By adjusting the refractive index parameter of the embossing layer to be between 1.4-1.6, the patent achieves improved light transmission without compromising the protective function of the layered structure.
2Stability of the object's composition
If multiple layers are disposed between the display panel and the optical fingerprint sensor, then the protection and structural stability are improved, but the heat dissipation capability is reduced
Solution Approach 1:
The embossing layer incorporates a porous or embossed structure that increases surface area and creates thermal pathways. This porous material approach enables improved heat dissipation from the fingerprint sensor region while preserving the overall structural stability of the display device layers.
3Temperature
If the opening portion of the heat dissipating layer is made larger, then the heat dissipation is improved, but the structural coverage is reduced
Solution Approach 1:
The embossing layer provides localized structural reinforcement in regions where the heat dissipating layer has reduced coverage. By concentrating embossed patterns and structural elements in specific areas, the patent maintains structural integrity where needed while allowing larger openings in the heat dissipating layer for optimal thermal management.
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
Enhances light transmittance to the sensor, improving fingerprint recognition rate and heat dissipation, reducing blurring and maintaining device integrity.
Implementation Method 1
an embossing layer disposed between the patterned film and the cushion layer
Implementation Method 2
a cushion layer disposed between the patterned film and the heat dissipating layer, and that absorbs an impact
Implementation Method 3
a heat dissipating layer disposed below the patterned film, and that dissipates heat
Data Source
AI summary
A display device includes an optical fingerprint sensor; a display panel; a patterned film disposed below the display panel and having an opening portion that exposes the optical fingerprint sensor; a heat dissipating layer disposed below the patterned film, and that dissipates heat; and a cushion layer disposed between the patterned film and the heat dissipating layer, and that absorbs an impact. The optical fingerprint sensor is disposed below the cushion layer, and the heat dissipating layer has an opening portion that has a size larger than a size of the opening portion of the patterned film.