Quantum Dot Film for AR Micro-Display Diffraction Efficiency
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Solution Overview
Problem
Augmented reality devices face challenges in miniaturizing and reducing weight while maintaining high-definition images due to low diffraction efficiency caused by wide bandwidth light emission from micro-displays like OLED and micro-LED, which impairs optical efficiency and image clarity.
Innovation Solution
Incorporating a quantum dot element with high efficiency, such as CdSeS/ZnS alloyed quantum dots or perovskite quantum dots, between the micro-display and diffractive or holographic optical elements to narrow the wavelength bandwidth of image light, thereby enhancing diffraction efficiency by 60% or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If micro-display devices like OLED and micro-LED are used in augmented reality devices, then the device can achieve compact size and light weight, but the wide bandwidth light emission causes low diffraction efficiency and impairs optical system performance
Solution Approach 1:
The patent introduces a quantum dot film as an intermediary component between the micro-display and the optical system. This quantum dot film converts the wide bandwidth light emission from OLED/micro-LED into narrow bandwidth light, thereby resolving the contradiction by mediating the optical properties without requiring a complete system redesign. The quantum dot film acts as a wavelength converter that maintains the benefits of compact micro-displays while eliminating their wide spectral bandwidth issue.
Solution Approach 2:
The patent changes the spectral parameter of the light emission by using quantum dot materials with specific size-controlled emission characteristics. By selecting quantum dots with appropriate sizes and materials (e.g., CdSe, InP), the system transforms the wide bandwidth emission into narrow bandwidth emission, thereby improving diffraction efficiency while maintaining the compact form factor of the original micro-display devices.
2Volume of moving object
If micro-display devices like OLED and micro-LED are used in augmented reality devices, then the device can achieve compact size and light weight, but the wide bandwidth light emission causes low diffraction efficiency and impairs image clarity
Solution Approach 1:
The quantum dot film serves as an intermediary that improves image clarity by converting wide bandwidth light into narrow bandwidth light. This mediation allows the compact micro-display to produce high-quality images suitable for augmented reality applications, resolving the contradiction between small size and image quality.
Solution Approach 2:
By changing the spectral bandwidth parameter through quantum dot conversion, the system achieves high image clarity required for augmented reality while maintaining the compact volume of modern micro-display technologies. The narrow bandwidth emission from quantum dots provides the optical precision needed for clear, sharp images in small form factors.
3Device complexity
If conventional optical systems are used with wide bandwidth light emission, then the optical path can be kept simple, but aberrations increase and image sharpness decreases
Solution Approach 1:
The patent changes the fundamental parameter of light bandwidth from wide to narrow through quantum dot conversion. This parameter change eliminates the need for complex aberration correction optics, as narrow bandwidth light inherently produces less chromatic aberration. The result is improved image sharpness with a relatively simple optical system.
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
This approach effectively reduces aberrations and improves image clarity in wearable augmented reality devices, enabling high-definition images while achieving light weight and miniaturization.
Implementation Method 1
an element including a quantum dot material is disposed at one position of the paths of the light that is emitting from a micro-display and that is incident to a diffractive optical element and/or a holographic optical element
Data Source
AI summary
In an augmented reality device including a micro-display, a transfer optical system that transmits light from the micro-display to a predetermined path, a diffractive optical element and/or a holographic optical element, a device including a quantum dot is disposed in one of the paths of image light incident from the micro-display to a diffractive optical element and/or a holographic optical element.