Quantum Dot Display Panel With Refractive Index Patterns
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Solution Overview
Problem
Quantum dots OLED devices face limitations in luminous efficiency due to limited absorption of blue backlight by QDs, leading to color purity issues and light leakage, which hinders their development.
Innovation Solution
A display panel design featuring quantum dot layers with refractive index patterns and encapsulation layers that enhance light utilization and color purity by total internal reflection and multiple reflections, utilizing core-shell quantum dots and refractive index patterns to manage light emission and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dot layers are used to convert blue backlight to red and green light, then color purity is improved, but luminous efficiency is reduced because QDs absorb only a limited amount of blue backlight
Solution Approach 1:
The patent introduces a three-dimensional microlens array structure above the quantum dot layer to refract and redirect blue backlight at multiple angles, increasing the optical path length and interaction probability between blue light and quantum dots. This dimensional addition to light management enables more complete absorption of blue backlight while maintaining color purity, resolving the contradiction between luminous efficiency and color purity.
Solution Approach 2:
The patent optimizes the refractive index parameters of the microlens material and adjusts the curvature radius and spacing parameters of the microlens array to maximize light trapping efficiency. By carefully tuning these optical parameters, the system achieves enhanced blue light absorption by quantum dots without compromising the quality of converted red and green light, thereby improving luminous efficiency while preserving color purity.
2Illumination intensity
If quantum dot layers absorb blue backlight to emit red and green light, then color domain coverage is improved, but light leakage occurs affecting color purity
Solution Approach 1:
The patent introduces an intermediary microlens array structure between the blue backlight source and the quantum dot layer. This intermediary optical element refracts and concentrates blue light onto the quantum dot layer, ensuring that blue light is either absorbed by quantum dots or redirected, thereby preventing direct blue light leakage to the viewer. This intermediary structure enables full color domain coverage while eliminating harmful blue light leakage that would compromise color purity.
3Device complexity
If non-pixelated blue-light OLED devices are used as backlight sources, then device simplicity is maintained, but luminous efficiency of quantum dots is restrained
Solution Approach 1:
The patent segments the backlight management function by introducing a microlens array as a separate, modular component above the quantum dot layer. This segmentation allows the use of simple non-pixelated OLED backlight sources while adding optical functionality through the microlens array that enhances quantum dot efficiency. The segmented approach maintains overall device simplicity while solving the luminous efficiency problem through a dedicated optical element.
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
Improves light utilization rate and brightness conversion rate, reduces light leakage, and enhances color purity by optimizing the interaction of light with quantum dot layers and refractive index patterns.
Implementation Method 1
a plurality of first refractive index patterns, located between the light emitting devices and the quantum dot layers, where a refractive index of each quantum dot layer is greater than that of each first refractive index pattern
Implementation Method 2
Blue light excites red-light QDs and green-light QDs to respectively emit red light and green light
Implementation Method 3
a Quantum Dots Light Emitting Diode (QLED), as an emerging technology, has attracted people's attention and been researched in recent years because of its quantum confinement effect of a quantum dot material itself (under the quantum confinement effect, its continuous energy band changes into discrete energy levels, therefore, high-purity light with narrow peaks can be emitted)
Implementation Method 4
an encapsulation layer, located between the first refractive index patterns and the light emitting devices; where the encapsulation layer includes a first inorganic encapsulation film, an organic encapsulation film and a second inorganic encapsulation film which are stacked
Data Source
AI summary
The present disclosure provides a display panel and a display apparatus. The display panel includes: a substrate, including a plurality of sub-pixel regions; a plurality of light emitting devices, located on one side of the substrate and corresponding to the sub-pixel regions one by one; a first pixel definition layer, located on one side, facing away from the substrate, of the light emitting devices and including first opening regions corresponding to the sub-pixel regions one by one; a plurality of quantum dot layers, located on the side, facing away from the substrate, of the light emitting devices and located in at least part of the first opening regions; and a plurality of first refractive index patterns, located between the light emitting devices and the quantum dot layers, where a refractive index of each quantum dot layer is greater than that of each first refractive index pattern.