Light Guide Display for Touch and Biometric Sensing
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Solution Overview
Problem
Current display devices lack integrated functionalities such as photosensing, biometric authentication, and health condition monitoring, limiting their versatility and convenience.
Innovation Solution
A display device incorporating a light guide plate, first and second light-emitting elements, and a light-receiving element that emits and receives visible and infrared light to enable touch sensing, biometric authentication, and health condition monitoring by converting light into electric signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If display devices incorporate multiple functionalities (photosensing, biometric authentication, health monitoring), then versatility and convenience are improved, but device complexity and component count increase
Solution Approach 1:
The display device integrates multiple functionalities including display, touch sensing, photosensing, biometric authentication, and health monitoring into a single unified structure. The light guide plate serves multiple purposes: as a light guide for display, as a touch sensor for touch detection, and as a medium for infrared light transmission for biometric and health functions. This multi-functional integration resolves the contradiction by achieving versatility without proportionally increasing device complexity.
Solution Approach 2:
The patent combines separate functional components into integrated structures. The touch sensor and display are merged with the light guide plate forming a unified component. The biometric authentication and health monitoring functions are integrated into the same device structure using the existing light guide and light-receiving elements. This merging approach allows multiple functions to coexist without requiring separate dedicated components for each function.
2Adaptability or versatility
If separate components are added for touch panel and biometric authentication functions, then functionality is improved, but component count and device complexity increase
Solution Approach 1:
The light guide plate is designed to serve multiple functions simultaneously: guiding visible light for display, transmitting infrared light for biometric authentication, and acting as a touch sensor for touch detection. This universal component replaces what would traditionally require separate dedicated components, thereby improving functionality without increasing component count.
Solution Approach 2:
The patent merges the touch sensor, display light guide, and biometric authentication components into a single integrated light guide plate structure. The light-receiving element also serves multiple purposes by detecting both visible light (for display) and infrared light (for biometric authentication). This consolidation reduces the total number of components while maintaining all required functionalities.
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 device provides a multifunctional display with enhanced convenience by integrating touch panel functionality, biometric authentication, and health monitoring capabilities without increasing component count, allowing for simultaneous fingerprint and vein authentication and health data collection.
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
Implementation Method 4
The second light-emitting element has a function of emitting second light to a side surface of 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.