Infrared Light-Guide Display for Touch and Fingerprint Sensing
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Solution Overview
Problem
Existing display devices lack integrated functionalities such as photosensing, biometric authentication, and touch panel capabilities, limiting their convenience and versatility.
Innovation Solution
A display device incorporating a light-emitting element and a light-receiving element, with the light-emitting element emitting visible and infrared light, and the light-receiving element converting infrared light into an electric signal to enable touch sensing and biometric authentication, such as fingerprint recognition, while maintaining visibility and reducing component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display device integrates multiple functionalities (photosensing, biometric authentication, touch panel), then the versatility and convenience are improved, but the device complexity increases
Solution Approach 1:
The display device integrates multiple functions including display, photosensing, touch panel, and biometric authentication into a single system. The light-emitting element serves both display and photosensing functions, while the light-receiving element enables both touch detection and fingerprint recognition, allowing one device to perform multiple roles without requiring separate components for each function.
Solution Approach 2:
The patent combines the light-emitting element and light-receiving element within the same display structure, merging display functionality with sensing capabilities. The infrared light emission and detection are integrated into the existing display architecture, consolidating multiple functional systems into a unified device structure.
2Adaptability or versatility
If a light-receiving element is added to enable photosensing and authentication, then the functionality is improved, but the component count and structural complexity increase
Solution Approach 1:
The light-receiving element is designed to serve multiple purposes: detecting touch inputs for the touch panel function and capturing fingerprint patterns for biometric authentication. This single component performs dual functions, adding photosensing capability without requiring separate elements for each sensing application.
3Adaptability or versatility
If infrared light emission is added for biometric authentication, then the authentication function is improved, but the energy consumption increases
Solution Approach 1:
The infrared light-emitting element operates in a periodic or pulsed manner rather than continuously, activating only when biometric authentication is required. This approach enables the authentication function on demand while minimizing energy consumption during normal display operation when infrared emission is not needed.
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, biometric authentication, and photosensing capabilities without compromising visibility or increasing component complexity.
Implementation Method 1
Light-emitting elements (also referred to as EL elements) utilizing an electroluminescence (hereinafter referred to as EL) phenomenon
Implementation Method 2
the light-receiving element converting infrared light into an electric signal
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 both 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 a function 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.