Selective Reflector Micro-LED Display for Light Mixing Isolation
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Solution Overview
Problem
In high-density micro light emitting diode displays, such as those used in head-mounted displays for virtual and augmented reality, it is challenging to prevent light mixing between adjacent micro light emitting diode elements without using a separate partition, due to the need for reduced partition width.
Innovation Solution
A display device design incorporating a substrate with light emitting elements, a wavelength conversion layer, and selective transmission films that reflect and transmit light to prevent mixing, including a first selective transmission film between the light emitting element and the wavelength conversion layer, and a second selective transmission film on the wavelength conversion layer, which alternately arrange layers with different refractive indices to manage light reflection and transmission efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a partition is provided between adjacent micro light emitting diode elements to prevent light mixing, then light mixing is prevented, but the partition width must be reduced due to high integration, making fabrication difficult
Solution Approach 1:
The patent extracts the light mixing prevention function from the mechanical partition structure and implements it through optical films (reflective and absorptive layers) that selectively interact with light wavelengths. This removes the need for wide physical partitions while maintaining light isolation between adjacent micro LEDs.
Solution Approach 2:
The patent introduces intermediary optical films between adjacent micro light emitting diode elements. These films include reflective layers that bounce light away from adjacent elements and absorptive layers that absorb stray light, preventing light mixing without requiring wide physical partitions.
2Productivity
If partition width is reduced to achieve high integration, then device density increases, but light mixing prevention becomes difficult
Solution Approach 1:
The patent replaces the mechanical light isolation approach (wide physical partitions) with an optical system consisting of reflective and absorptive films. This substitution allows for much thinner isolation structures, enabling high integration density while maintaining effective light mixing prevention.
Solution Approach 2:
The patent changes the approach from spatial parameter (partition width) to optical parameter (light wavelength selectivity). By using films with specific reflective and absorptive properties at different wavelengths, the system prevents light mixing with minimal physical separation, enabling high device density.
3Use of energy by moving object
If multiple selective transmission films with different refractive indices are used to manage light reflection and transmission, then light emission efficiency is enhanced, but device structure becomes more complex
Solution Approach 1:
The patent segments the light management function into distinct layers: reflective layers for specific wavelengths and absorptive layers for other wavelengths. This segmentation allows each layer to be optimized for its specific function, enhancing overall light emission efficiency while maintaining a manageable layered structure.
Solution Approach 2:
The patent creates multi-functional optical films that simultaneously perform multiple functions: some films both reflect and absorb light at different wavelengths, and the layered structure serves both as optical management and as protective/structural elements. This reduces the need for separate dedicated components.
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 design effectively prevents light mixing between adjacent light emitting elements, enhancing the efficiency of light emission and conversion while eliminating the need for a separate partition, thereby improving display performance.
Implementation Method 1
a first selective transmission film between the light emitting element and the wavelength conversion layer to reflect the first light and the second light, which are incident from the wavelength conversion layer
Implementation Method 2
a second selective transmission film on the wavelength conversion layer to reflect the first light incident from the wavelength conversion layer and to transmit the second light
Implementation Method 3
a wavelength conversion layer on the light emitting element and including wavelength conversion particles to convert the first light into second light
Implementation Method 4
The first sub-selective transmission film may include a plurality of first odd numbered layers having a first refractive index and a plurality of first even numbered layers having a second refractive index lower than the first refractive index
Data Source
AI summary
According to some embodiments of the present disclosure, there is provided a display device including a substrate, a light emitting element on the substrate and emitting first light, a wavelength conversion layer on the light emitting element and including wavelength conversion particles for converting the first light into second light, a first selective transmission film between the light emitting element and the wavelength conversion layer and reflecting the first light and the second light, which are incident from the wavelength conversion layer, and a second selective transmission film on the wavelength conversion layer and reflecting the first light incident from the wavelength conversion layer and transmitting the second light.