Light Guide Display Panel for Fingerprint and Touch Sensing
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Solution Overview
Problem
Existing display devices lack integrated functionalities such as photosensing, biometric authentication, touch panel functions, and health condition monitoring, limiting their convenience and multifunctionality.
Innovation Solution
A display device incorporating a first substrate, a light guide plate, a first light-emitting element, a second light-emitting element, and a light-receiving element, which emits visible and infrared light for image capture and biometric authentication, while also sensing user health conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If display devices incorporate multiple integrated functionalities (photosensing, biometric authentication, touch panel functions, health monitoring), then the versatility and user convenience are improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple functional elements (display elements, light-receiving elements, touch sensor electrodes) into a single integrated display device structure. The light-receiving elements are embedded within the display panel layers, allowing the device to perform display, photosensing, and touch detection functions simultaneously without requiring separate components, thus reducing overall structural complexity while maintaining high versatility.
Solution Approach 2:
The display device is designed with multi-functional capabilities where the same structural components serve multiple purposes. The light-receiving elements function both as part of the display structure and as photosensors for biometric authentication and health monitoring. The touch sensor electrodes serve dual purposes as both touch detection elements and structural components of the display panel, achieving universal functionality without proportionally increasing complexity.
2Adaptability or versatility
If multiple functional elements are integrated into the display device, then the functionality is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent divides the display device into distinct functional layers including substrate, buffer layer, light-emitting layer, light-receiving layer, and electrode layers. Each layer can be manufactured and tested separately before final assembly, allowing for specialized manufacturing processes for each functional element while maintaining overall integration. This segmentation enables modular manufacturing approaches that reduce the complexity of producing the complete multi-functional device.
3Measurement precision
If the display device includes both visible light emission and infrared light emission capabilities, then the biometric authentication function is improved, but the energy consumption increases
Solution Approach 1:
The display device employs periodic or pulsed light emission rather than continuous emission for biometric authentication. The light-receiving elements are activated at specific intervals to capture biometric data, and the light-emitting elements pulse at controlled frequencies. This periodic operation significantly reduces energy consumption compared to continuous operation while maintaining sufficient measurement precision for accurate biometric authentication.
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 display device achieves a combination of image display, touch sensing, biometric authentication, and health monitoring, enhancing user convenience and functionality without increasing complexity.
Implementation Method 1
The light-receiving element has functions of receiving the first light and converting the first light into an electric signal
Implementation Method 2
The light-receiving element has functions of receiving the second light and converting the second light into an electric signal
Implementation Method 3
The first light-emitting element has a function of emitting first light through the light guide plate
Data Source
AI summary
A display device having a photosensing function is provided. A display device having a biometric authentication function typified by fingerprint authentication is provided. A display device having a touch panel function and a biometric authentication function is provided. The display device includes a first substrate, a light guide plate, a first light-emitting element, a second light-emitting element, and alight-receiving element. The first substrate and the light guide plate are provided to face each other. The first light-emitting element and the light-receiving element are provided between the first substrate and the light guide plate. The first light-emitting element has a function of emitting first light through the light guide plate. The second light-emitting element has a function of emitting second light to a side surface of the light guide plate. The light-receiving element has functions of receiving the first light and converting the first light into an electric signal and functions of receiving the second light and converting the second light into an electric signal. The first light includes visible light, and the second light includes infrared light.