Backlight Light Conversion Layers for Directional Polarized Emission
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Solution Overview
Problem
Existing display technologies, particularly in head-mounted VR devices, face challenges in efficiently directing and polarizing light for enhanced image quality and brightness, which affects the immersive experience.
Innovation Solution
A light-emitting device with a first and second light conversion layer, including a multi-quantum well layer and a metal wire grid structure, to manipulate light direction and polarization, combined with an isolation portion and electrode layers for improved light emission and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light emission structures are used, then the device structure is simple, but the light directionality and polarization control are insufficient
Solution Approach 1:
The patent divides the light conversion function into two separate layers: a first light conversion layer for changing light traveling direction and a second light conversion layer for polarization control. This segmentation allows each layer to specialize in one function, improving overall light directionality and polarization control while maintaining manageable structural complexity
Solution Approach 2:
The patent introduces a vertical stacking arrangement where the first light conversion layer is positioned below the light-emitting portion and the second light conversion layer is positioned above it. This three-dimensional layered structure enables simultaneous control of light direction and polarization by manipulating light in different spatial dimensions as it passes through each layer
2Illumination intensity
If conventional light emission structures are used, then the device structure is simple, but the image brightness and quality are limited
Solution Approach 1:
The patent creates a continuous light path where light passes through the first light conversion layer, reflects off the light-emitting portion, passes through the second light conversion layer, and exits the device. This continuous manipulation of light through multiple conversion layers ensures maximum light utilization and brightness enhancement without wasted light paths
Solution Approach 2:
The patent employs composite light conversion layers with specific material properties: the first light conversion layer uses materials that effectively change light traveling direction, while the second light conversion layer uses materials that provide polarization control. These composite layers work together to enhance both image brightness and quality through optimized optical properties
3Reliability
If light is emitted without polarization control, then the device is simpler, but the image quality and immersion experience are reduced
Solution Approach 1:
The patent extracts the polarization control function into a separate second light conversion layer that is specifically positioned to receive light from the first light conversion layer. This extraction allows dedicated polarization control without complicating the overall device structure, as the polarization function is isolated in its own optimized layer
Solution Approach 2:
The first light conversion layer acts as an intermediary between the light-emitting portion and the second light conversion layer. It first manages the light traveling direction and then passes the light to the second layer for polarization control, creating a coordinated two-stage process that improves image quality while maintaining structural clarity
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
Enhances light directionality and polarization, resulting in improved image brightness and quality, thereby enriching the immersive experience in VR and AR applications.
Implementation Method 1
The first light conversion layer is configured to change a traveling direction of part of light incident on the first light conversion layer
Implementation Method 2
a polarization direction of at least part of the light with the change in the traveling direction is changed
Implementation Method 3
The second light conversion layer is configured to change a traveling direction of part of light incident on the second light conversion layer
Implementation Method 4
the second light conversion layer is configured to enable at least part of light entering the second light conversion layer to form linearly polarized light
Data Source
AI summary
A light-emitting device includes a first light conversion layer, a light emitting portion located on a side of the first light conversion layer, and a second light conversion layer located on a side of the light-emitting portion away from the first light conversion layer. The first light conversion layer is configured to change a traveling direction of part of light incident of the first light conversion layer. The second light conversion layer is configured to change a traveling direction of part of light incident on the second light conversion layer, so that the light with a change in the traveling direction exits in a direction towards the first light conversion layer, and the second light conversion layer is configured to enable at least part of light entering the second light conversion layer to form linearly polarized light to exit from the light-emitting device.