Quantum Dot Color Filter for Micro-LED Display Color Purity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current display devices face challenges in achieving high-resolution images with high light efficiency and color purity, as individually emitting systems require complex pixel formation with different materials and suffer from energy loss when passing light through color filters, leading to reduced brightness and color purity.
Innovation Solution
An electronic device with light emitting elements less than 10 micrometers in size, a quantum dot color filter layer, and a thin film encapsulation layer, where the quantum dot color filter layer includes partitioned quantum dot color filters and a transmission layer, and a light guide layer to enhance light extraction and color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light is passed through a color filter to express colors, then ease of manufacture in large area is improved, but light energy is absorbed causing loss of brightness and color purity
Solution Approach 1:
The patent changes the material parameter of the color filter from conventional organic dyes to quantum dots, which have different optical properties. Quantum dots exhibit size-dependent emission wavelengths and higher quantum efficiency, converting more absorbed light into emitted light with less energy loss, thus improving brightness and color purity while maintaining ease of large-area manufacturing
Solution Approach 2:
The patent employs a composite structure combining quantum dot color filters with specific substrate materials and encapsulation layers. This composite approach optimizes light extraction efficiency and reduces energy loss by carefully selecting materials with complementary optical properties, while the quantum dots provide superior color purity and brightness compared to conventional color filters
2Ease of manufacture
If light is passed through a color filter to express colors, then ease of manufacture in large area is improved, but color purity deteriorates due to wide full width at half maximum
Solution Approach 1:
The patent changes the material parameter from conventional color filter dyes to quantum dots, which have size-dependent emission properties. By controlling quantum dot size during synthesis, the emission wavelength and full width at half maximum can be precisely tuned, achieving superior color purity while maintaining ease of large-area manufacturing through solution processing techniques
3Manufacturing precision
If individually emitting pixels are formed with different materials, then color purity is improved, but device complexity increases making large scale formation difficult
Solution Approach 1:
The patent applies a universal quantum dot color filter layer that can work with various light emitting elements (OLEDs, micro-LEDs, quantum well LEDs) across different pixel types. This single multi-functional layer provides color conversion for all pixels, eliminating the need for complex pixel-specific material structures while maintaining high color purity, thus reducing device complexity for large-scale manufacturing
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 enables the display of high-resolution images with improved light efficiency and color reproducibility by effectively utilizing quantum dot technology and light guide layers to minimize energy loss and enhance color purity.
Implementation Method 1
a first quantum dot color filter including quantum dots which convert third light into first light, and a second quantum dot color filter including quantum dots which convert third light into second light
Data Source
AI summary
An electronic device includes a first substrate, a plurality of light emitting elements each having a horizontal length and a vertical length which are less than or equal to about 10 micrometers (μm), each of the plurality of light emitting elements being disposed on the first substrate, a quantum dot color filter layer disposed on the plurality of light emitting elements, and a first overcoat layer between a plurality of light emitting elements and the quantum dot color filter layer. The quantum dot color filter layer includes a plurality of quantum dot color filters partitioned by a plurality of first partition walls so as to be overlapped with the plurality of light emitting elements, respectively.