Light Guide Display Integration for Touch and Biometric 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 versatility and convenience.
Innovation Solution
A display device incorporating a light-emitting element and a light-receiving element, with visible and infrared light components, allowing for image display, touch sensing, and biometric authentication through fingerprint or vein recognition, utilizing a light guide plate and substrates with specific refractive indices to manage light transmission and scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display device incorporates multiple functional elements (light-emitting elements, light-receiving elements, touch sensors), then the versatility and convenience of the device is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple functional elements (display function, touch sensing function, and photosensing function) into a single integrated device structure. The light-emitting elements and light-receiving elements are arranged in overlapping regions within the same device, allowing the device to perform multiple functions simultaneously without requiring separate independent devices.
Solution Approach 2:
The display device is designed to serve multiple purposes: it can display images through light-emitting elements, detect touch inputs through capacitive touch sensors, and perform photosensing through light-receiving elements. This multi-functional design allows a single device to replace what would traditionally require multiple separate devices.
2Adaptability or versatility
If light-receiving elements are arranged in overlapping regions with light-emitting elements, then the device achieves both display and photosensing functions, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies different functional characteristics to different regions of the device. Light-emitting elements are positioned in certain regions for display purposes, while light-receiving elements are positioned in overlapping regions for photosensing. The touch sensor electrodes are arranged to overlap with both light-emitting and light-receiving elements in specific areas, creating localized functional zones with distinct qualities.
3Ease of operation
If the device integrates touch panel and biometric authentication functions, then the convenience is enhanced, but the device complexity increases
Solution Approach 1:
The patent merges touch panel functionality with biometric authentication capability by integrating capacitive touch sensor electrodes with light-receiving elements. The same structural components serve dual purposes: detecting touch inputs and capturing biometric information such as fingerprint patterns, thereby enhancing convenience without proportionally increasing complexity.
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 and biometric authentication features while maintaining image visibility and accuracy.
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 has a function of receiving the second light and converting the second light into an electric signal
Implementation Method 3
utilizing a light guide plate and substrates with specific refractive indices to manage light transmission and scattering
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.