Integrated Light-Emitting and Receiving Device for Biometric Sensing
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Solution Overview
Problem
Current display technologies lack a novel structure for high-definition and high-resolution displays with integrated light detection functionality, limiting their ability to provide both image display and biometric authentication capabilities in a compact and efficient manner.
Innovation Solution
A display apparatus comprising a power supply line, transistors, a light-emitting device, and a light-receiving device, where the light-emitting device includes a light-emitting layer and electron-transport layers, and the light-receiving device includes an active layer and hole-transport layers, with specific electrical connections and layer configurations to enable both light emission and detection, allowing for image display and biometric sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate display and fingerprint sensor components are used, then functional requirements are met, but device complexity and size increase
Solution Approach 1:
The patent combines light-emitting and light-receiving devices into a single integrated structure where the light-emitting device includes a first electrode, light-emitting layer, electron-transport layer, and second electrode, while the light-receiving device shares the second electrode and includes a third electrode, active layer, and hole-transport layer. This merging eliminates the need for separate display and fingerprint sensor components, reducing device complexity while maintaining both functions.
Solution Approach 2:
The second electrode serves dual purposes as both the cathode of the light-emitting device and the anode of the light-receiving device. This multi-functional design allows a single component to fulfill multiple roles, reducing the total number of components needed while achieving both display and biometric authentication capabilities.
2Adaptability or versatility
If multiple separate components are used for display and sensing, then functional requirements are met, but the device size increases
Solution Approach 1:
By merging the light-emitting and light-receiving devices into a single integrated structure that shares common electrodes and layers, the patent reduces the total area required compared to using separate display and fingerprint sensor components. The integrated design allows both display and biometric authentication functions to coexist in a compact form factor.
3Device complexity
If integrated light-emitting and light-receiving devices are used, then device compactness is improved, but manufacturing precision requirements increase
Solution Approach 1:
The integrated device is segmented into distinct functional layers (electron-transport layer, hole-transport layer, active layer) that can be manufactured separately and then assembled with precise alignment. This segmentation approach allows for specialized manufacturing processes for each layer while maintaining overall manufacturing feasibility through modular assembly.
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 provides a display apparatus with enhanced resolution and light detection capabilities, enabling high-definition imaging and biometric authentication, such as fingerprint scanning, while reducing the number of components and improving device compactness.
Implementation Method 1
Light-emitting devices (also referred to as EL devices or EL elements) utilizing electroluminescence (hereinafter referred to as EL)
Implementation Method 2
the light-receiving device includes a third electrode, an active layer, a first hole-transport layer
Data Source
AI summary
A display apparatus with a novel structure is provided. The display apparatus includes a power supply line, a first transistor, a second transistor, a light-emitting device, and a light-receiving device. The light-emitting device includes a first electrode, a light-emitting layer, a first electron-transport layer, an electron-injection layer, and a second electrode that are stacked in this order. The light-receiving device comprises a third electrode, an active layer, a first hole-transport layer, the electron-injection layer, and the second electrode that are stacked in this order. The first electrode is electrically connected to one of a source and a drain of the first transistor. The second electrode is electrically connected to one of a source and a drain of the second transistor. The power supply line is electrically connected to the other of the source and the drain of the first transistor and the other of the source and the drain of the second transistor.