Quantum Dot Display Ligand Layout for Edge Brightness Uniformity
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Solution Overview
Problem
Quantum dots in display devices deteriorate due to oxygen and moisture, leading to uneven brightness between the center and peripheral portions, as the ligand content is not optimally distributed, causing power consumption issues.
Innovation Solution
A display device with a quantum dot light-emitting layer, where the ligand content is greater in the outer peripheral portion than in the center portion, forming a sealing layer to protect the quantum dots from oxygen and moisture, thereby maintaining low power consumption and uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ligand content is uniformly distributed across the display portion, then the manufacturing process is simple, but uneven brightness occurs due to quantum dot deterioration in the outer peripheral portion
Solution Approach 1:
The patent applies local quality by creating a non-uniform ligand distribution where the outer peripheral portion has a higher ligand content than the center portion. This localized variation in ligand concentration specifically addresses the higher deterioration rate in peripheral areas exposed to oxygen and moisture, thereby maintaining brightness uniformity across the display portion without requiring complex manufacturing processes
2Reliability
If the quantum dots are protected from oxygen and moisture, then brightness uniformity is maintained, but the sealing structure becomes more complex
Solution Approach 1:
The patent changes the chemical parameter of ligand concentration in the quantum dot structure to provide protection against oxygen and moisture. By adjusting the ligand content parameter - specifically increasing it in the outer peripheral portion - the quantum dots gain enhanced stability and resistance to environmental factors without requiring additional sealing layers or structural modifications
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 increased ligand content in the outer peripheral portion effectively suppresses quantum dot deterioration, ensuring consistent brightness and low power consumption without complicating the manufacturing process.
Implementation Method 1
a ligand formed at least in each of the plurality of pixels in an outer peripheral portion from an edge of a sealing layer formed on the display portion
Data Source
AI summary
Provided is a display device using a quantum dot including: a display portion including a plurality of pixels configured to display an image, each of the plurality of pixels including a light-emitting layer including the quantum dot, an anode electrode, and a cathode electrode; and a ligand formed at least in each of the plurality of pixels in an outer peripheral portion from an edge of a sealing layer formed on the display portion. Content of the ligands in the plurality of pixels of the same color is greater in the outer peripheral portion of the display portion than in a center portion of the display portion.