Encapsulated Color Conversion Layer for Stable Micro-LED Displays
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Solution Overview
Problem
Display devices using micro-LEDs suffer from wavelength shift and image quality deterioration due to power consumption and temperature changes, and organic light-emitting devices face burn-in issues, reducing their lifespan.
Innovation Solution
A display module with a color conversion layer based on inorganic light-emitting devices, encapsulated by a reflective layer and a black matrix, and covered by a first inorganic film, to improve power consumption and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If micro-LEDs are used as light emitting devices, then burn-in is prevented and lifespan is extended, but wavelength shift occurs due to power consumption and temperature changes
Solution Approach 1:
The patent uses quantum dots with specific size parameters (2-50 nm diameter) to convert the wavelength of blue light from micro-LEDs to red light, compensating for wavelength shifts caused by temperature and current variations in the micro-LEDs
Solution Approach 2:
The patent combines micro-LEDs (inorganic light-emitting material) with quantum dots (semiconductor nanocrystals) to create a hybrid structure where the quantum dots stabilize the output wavelength while the micro-LEDs provide efficient light emission and long lifespan
2Ease of manufacture
If organic light emitting devices are used, then ease of manufacture is improved, but burn-in occurs reducing lifespan
Solution Approach 1:
The patent replaces organic light-emitting materials with inorganic micro-LEDs that have significantly longer operational lifespans and do not suffer from burn-in, while maintaining cost-effectiveness through the use of quantum dot conversion layers that can be manufactured using solution processing techniques
3Measurement precision
If color conversion layer size is reduced to improve resolution, then image quality is improved, but light emission intensity decreases
Solution Approach 1:
The patent uses quantum dots with high photoluminescence quantum yield (exceeding 50%) to maintain high light emission intensity even when the color conversion layer size is reduced, thereby improving resolution without sacrificing brightness
Solution Approach 2:
The patent optimizes the size parameter of quantum dots (2-50 nm) to achieve high color purity and efficient light conversion, allowing smaller color conversion layers to maintain sufficient light emission intensity for high-resolution displays
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 solution enhances the power efficiency and image quality of display modules by mitigating wavelength shift and preventing burn-in, while maintaining long-term performance.
Implementation Method 1
a color conversion layer and a color filter layer stacked on each of the plurality of light emitting devices
Implementation Method 2
a reflective layer surrounding a side surface of the light source and configured to reflect light emitted from a side surface of the light source
Data Source
AI summary
A display module comprises: a display panel comprising a substrate, a plurality of light sources including a plurality of light emitting devices mounted on the substrate, a color conversion layer and a color filter layer stacked on each of the plurality of light emitting devices, the plurality of light sources may each be provided with encapsulation structure, and a size of the color conversion layer may be less than a size of the light emitting device.