Display Apparatus with Infrared EL Layers for Authentication
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Solution Overview
Problem
Current display technologies face challenges in achieving high resolution, high contrast, and integrating personal authentication functions while maintaining a lightweight and low-power design, particularly in devices like smartphones and virtual reality systems.
Innovation Solution
A display apparatus incorporating a combination of light-emitting elements, including infrared-emitting and visible light-emitting organic electroluminescent elements, with a light-receiving element for personal authentication, and a novel fabrication method using a metal mask-less structure to reduce the distance between EL layers and enhance aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the distance between EL layers is reduced to increase aperture ratio and resolution, then manufacturing precision and alignment difficulty worsen
Solution Approach 1:
The patent divides the display structure into separate first and second substrates with EL layers on opposite sides, allowing independent fabrication and alignment. The insulating layers and sealing structures create distinct alignment reference points that simplify the positioning process while maintaining minimal distance between functional EL layers.
Solution Approach 2:
The patent introduces insulating layers and sealing structures as intermediary elements between the EL layers. These intermediaries provide mechanical support, electrical isolation, and alignment references, enabling precise positioning of the EL layers at minimal distance without direct contact that would cause short circuits.
2Adaptability or versatility
If multiple functional layers are integrated to achieve high resolution and authentication function, then device complexity increases
Solution Approach 1:
The patent combines the display function (EL layers) and authentication function (sensor portion) into a single integrated structure. The sensor portion is positioned to overlap with the display area, allowing both functions to share the same physical space and substrate structure, thereby reducing overall device complexity despite multiple functionalities.
Solution Approach 2:
The first substrate serves multiple functions: as a structural support for the EL layers, as a mounting platform for the sensor portion, and as a alignment reference for the second substrate. This multi-functionality reduces the need for separate components and simplifies the overall device architecture.
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 solution enables a display apparatus with high resolution, high contrast, and integrated personal authentication capabilities, achieving a high aperture ratio and enabling efficient fabrication with reduced non-light-emitting regions, suitable for applications like smartphones and virtual reality systems.
Implementation Method 1
The first light-emitting element has a function of emitting infrared light
Implementation Method 2
The light-receiving element has a function of detecting infrared light
Data Source
AI summary
A display apparatus having both a personal authentication function and a high resolution is provided. The display apparatus includes a display portion and a sensor portion. The display portion includes a first light-emitting element and a second light-emitting element. The first light-emitting element includes a first EL layer. The second light-emitting element includes a second EL layer. The sensor portion includes a light-receiving element. The first light-emitting element has a function of emitting infrared light. The light-receiving element has a function of detecting infrared light. A distance between the first EL layer and the second EL layer is less than or equal to 6 μm.