Display Light Guide Layout 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 health conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display device incorporates multiple functions (photosensing, biometric authentication, touch panel, health monitoring), then the functionality and convenience are improved, but the device complexity increases
Solution Approach 1:
The display device integrates multiple functions including display, photosensing, biometric authentication, touch panel detection, and health monitoring into a single system. The light-emitting element serves both display and illumination purposes, while the light-receiving element handles both touch sensing and biometric authentication, allowing one component to perform multiple functions and thereby reducing overall device complexity despite the multifunctional capabilities.
2Measurement precision
If the display device uses a light guide plate with specific refractive index properties for infrared light, then the biometric authentication accuracy is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The light guide plate is designed with specific refractive index characteristics for infrared light wavelengths (800 nm to 1000 nm) to enable effective total internal reflection and guide infrared light to the light-receiving element. By optimizing the refractive index parameter of the light guide plate material, the device achieves high biometric authentication accuracy while maintaining feasible manufacturing tolerances through material selection rather than complex structural controls.
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 device complexity.
Implementation Method 1
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
Implementation Method 2
The first light-emitting element has a function of emitting first light through the light guide plate
Implementation Method 3
The second light-emitting element has a function of emitting second light to a side surface of the light guide plate
Implementation Method 4
The light guide plate... has a lower refractive index with respect to light in a wavelength range from 800 nm to 1000 nm than 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 a light-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.