Integrated Display Sensor Stack for Clear Fingerprint Imaging
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Solution Overview
Problem
Display devices require higher definition, lower power consumption, and additional functions like image capturing and fingerprint authentication while minimizing component count and structural vulnerability.
Innovation Solution
A display device design incorporating light-receiving and light-emitting elements with specific layer configurations, including a light-blocking layer and substrates with controlled refractive indices, to enable image capturing and enhance mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate components (display module, imaging module, fingerprint sensor) are used to achieve high definition, image capturing, and authentication functions, then functional versatility is improved, but device complexity and structural vulnerability increase
Solution Approach 1:
The patent combines the imaging function and fingerprint authentication function into the display device structure itself. The light-receiving element is integrated within the display module, eliminating the need for separate imaging modules and fingerprint sensors, thereby reducing component count while maintaining multifunctionality
Solution Approach 2:
The display device is designed to perform multiple functions using a single integrated structure. The same light-receiving element serves both imaging and fingerprint authentication purposes, and the display module itself acts as both display and sensor, achieving multi-functionality without increasing component count
2Length of moving object
If the second substrate is made thinner to reduce device thickness, then portability is improved, but mechanical strength and reliability deteriorate
Solution Approach 1:
The patent changes the refractive index parameter of the second substrate to be higher than that of the resin layers. This parameter change allows the second substrate to be made thinner while maintaining optical performance and structural integrity, as the higher refractive index material provides better light confinement and structural strength at reduced thickness
3Length of moving object
If the first resin layer is made thinner to reduce overall device thickness, then compactness is improved, but light-receiving performance and image quality deteriorate
Solution Approach 1:
The patent optimizes the thickness parameter of the first resin layer to be within a specific range (1-10 times the width of the light-receiving region). This parameter optimization ensures sufficient light transmission and focusing performance for clear image capture while keeping the overall device thickness reduced
Solution Approach 2:
The patent applies local quality optimization by positioning the light-blocking layer with its first opening portion at a specific location overlapping with the light-receiving element. This localized structural arrangement enhances light-receiving performance in the critical imaging region while maintaining overall device compactness
4Ease of manufacture
If conventional separate modules are used for display and imaging, then manufacturing simplicity is maintained, but reliability and structural vulnerability increase
Solution Approach 1:
The patent merges the display module and imaging module into a single integrated structure where the light-receiving element is positioned within the display module. This integration reduces the number of interfaces and connections between separate modules, thereby improving reliability and reducing structural vulnerability while maintaining manufacturing feasibility
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
The design allows for clear image capture, reduces component count, and provides a multifunctional display device with improved mechanical strength.
Implementation Method 1
Light-emitting elements (also referred to as EL elements) utilizing an electroluminescence (hereinafter referred to as EL) phenomenon
Implementation Method 2
a light-receiving element, a light-emitting element
Implementation Method 3
The second substrate has a higher refractive index with respect to a wavelength of light emitted by the light-emitting element than the first resin layer and the second resin layer
Data Source
AI summary
An imaging device or a display device that is capable of clearly capturing an image of a fingerprint or the like can be provided. The display device includes a light-receiving element, a light-emitting element, a first substrate, a second substrate, a first resin layer, a second resin layer, and a light-blocking layer. The first resin layer, the second resin layer, and the second substrate are stacked over the first substrate. The light-receiving element and the light-emitting element are positioned between the first substrate and the first resin layer. The light-blocking layer is positioned between the first resin layer and the second resin layer and includes an opening portion overlapping with the light-receiving element. The opening portion in the light-blocking layer is positioned on an inner side of a light-receiving region of the light-receiving element in a plan view, and the width of the opening portion is less than or equal to the width of the light-receiving region. The second substrate is thicker than the first resin layer and the second resin layer. The thickness of a portion of the first resin layer, which overlaps with the light-receiving region of the light-receiving element, is greater than or equal to one time and less than or equal to 10 times as large as the width of the light-receiving region. The second substrate has a higher refractive index than the first resin layer and the second resin layer.