Grooved Wavelength Conversion Display for High-Resolution Color Efficiency
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Solution Overview
Problem
Existing display devices, particularly head-mounted displays, face challenges in achieving high-resolution color reproduction and optical efficiency due to limitations in wavelength conversion and light emission efficiency.
Innovation Solution
A display device design incorporating a first substrate with light-emitting elements, a second substrate with grooves and wavelength conversion layers, and color filters, along with a planarization layer and reflective layers to enhance optical path and efficiency, utilizing grooves and protrusions to improve alignment and efficiency of wavelength conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wavelength conversion layers are used to convert light from ultra-small light-emitting diode elements, then various colors can be displayed, but optical efficiency is reduced
Solution Approach 1:
The wavelength conversion layer is divided into multiple discrete color filters (red, green, blue) arranged in specific patterns. Each color filter converts a portion of the broad-spectrum light from the LED, enabling full-color display while maintaining better optical efficiency than conventional single-layer wavelength conversion by allowing selective wavelength conversion only where needed.
Solution Approach 2:
Different regions of the display panel use different color filter configurations optimized for their specific function. For example, certain areas may use quantum dot enhancement layers in addition to color filters, while other areas use only color filters. This local optimization improves overall optical efficiency by applying wavelength conversion only in regions where it is most beneficial.
2Manufacturing precision
If ultra-small light-emitting diode elements are used, then high-resolution display is achieved, but light emission efficiency is insufficient
Solution Approach 1:
The patent combines multiple materials and structures: ultra-small LED elements made from specific semiconductor compounds, quantum dot enhancement layers with precisely controlled particle sizes, and color filters with optimized spectral transmission characteristics. This composite approach allows the ultra-small LEDs to achieve both high resolution and improved light emission efficiency through synergistic material combinations.
Solution Approach 2:
The patent optimizes critical parameters including the size and composition of quantum dot particles (2-50 nm range), the thickness of various layers (color filter layers 50-200 nm, quantum dot layers 10-50 nm), and the spectral characteristics of color filters. By precisely controlling these parameters, the system achieves high resolution while maximizing light emission efficiency through optimized optical interactions.
3Adaptability or versatility
If conventional wavelength conversion is used, then color display is achieved, but optical path efficiency is not optimized
Solution Approach 1:
The patent introduces quantum dot enhancement layers that add a vertical dimension to the wavelength conversion process. These layers are positioned between the LED and color filters, creating a multi-layer optical path that enables sequential wavelength conversion. This dimensional addition allows optimization of the optical path by converting broad-spectrum LED light to narrower bands before color filter selection, improving overall optical efficiency.
Solution Approach 2:
Quantum dot enhancement layers act as intermediaries between the LED light source and the color filters. These quantum dots receive broad-spectrum light from the LED, convert it to specific wavelength bands, and then pass the converted light to the color filters. This intermediary conversion process optimizes the optical path by pre-filtering the spectrum before the color filters, reducing energy loss and improving optical efficiency.
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 design achieves ultra-high resolution and improved optical efficiency by optimizing the optical path and enhancing light emission efficiency, particularly for blue, green, and red light, while preventing damage to color filters and improving wavelength conversion efficiency.
Implementation Method 1
a plurality of wavelength conversion layers, each of the wavelength conversion layers being located in a corresponding groove of the plurality of grooves to convert a wavelength of light emitted from a corresponding light-emitting element
Implementation Method 2
a plurality of color filters on the wavelength conversion layers, respectively
Data Source
AI summary
A display device includes: a first substrate; a plurality of light-emitting elements on the first substrate; a second substrate opposite to the first substrate, and including one face facing the first substrate, and an opposite face to the one face; a plurality of grooves at the opposite face of the second substrate; a plurality of wavelength conversion layers, each of the wavelength conversion layers being located in a corresponding groove of the plurality of grooves to convert a wavelength of light emitted from a corresponding light-emitting element of the plurality of light-emitting elements; and a plurality of color filters on the wavelength conversion layers, respectively.