Quantum Dot Display Pixel Isolation for Luminance Stability
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Solution Overview
Problem
In display devices with high-resolution displays using quantum dots as light-emitting layers, there is a challenge in ensuring the reliability and manufacturability of the light-emitting elements, particularly due to the need for precise patterning and protection of quantum dots, which are prone to luminance degradation over time.
Innovation Solution
A display device structure comprising a substrate with light-emitting elements, quantum dot layers filled with a first inorganic material, and an inorganic layer between elements, using a second inorganic material with a band gap of 2.8 eV or more, to enhance reliability and reduce leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are used as light-emitting material to achieve high color gamut, then display quality is improved, but reliability deteriorates due to luminance degradation over time
Solution Approach 1:
An inorganic layer with wide band gap (2.8 eV or more) is introduced between adjacent light-emitting elements to prevent harmful interactions and protect quantum dots, thereby maintaining luminance stability while preserving high color gamut
Solution Approach 2:
The light-emitting element combines quantum dots for high color gamut with an inorganic protective layer having specific band gap properties, creating a composite structure that simultaneously achieves display quality and reliability
2Illumination intensity
If pixel size is reduced to achieve high resolution, then display quality is improved, but manufacturing precision deteriorates due to difficulty in accurate patterning
Solution Approach 1:
The invention specifies precise parameter ranges for the inorganic layer (band gap of 2.8 eV or more, specific thickness range) to simplify the manufacturing process and achieve reliable results without requiring extremely high patterning precision
3Reliability
If inorganic layer with wide band gap is used to protect quantum dots, then reliability is improved, but device complexity increases
Solution Approach 1:
The inorganic protective layer is applied locally between adjacent light-emitting elements rather than uniformly across the entire device, providing targeted protection while minimizing added complexity
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 achieves high reliability and resolution by protecting quantum dots and reducing luminance degradation, while minimizing leakage currents and improving manufacturability.
Implementation Method 1
an inorganic layer located between at least two of the light-emitting elements and including a second inorganic material including a semiconductor having a band gap of 2.8 eV or more or an insulator
Data Source
AI summary
The display device includes a substrate, a plurality of light-emitting elements including a quantum dot layer including a plurality of quantum dots and a first inorganic material with which spaces between the plurality of quantum dots are filled, and an inorganic layer. The inorganic layer is located between the at least two light-emitting elements. Furthermore, the inorganic layer contains a second inorganic material including a semiconductor having a band gap of 2.8 eV or more or an insulator.