Quantum Dot Barrier Rib Structure for Light-Shielding and Reflectance Control
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Solution Overview
Problem
Existing quantum dot barrier ribs face challenges in achieving high light-shielding properties and low reflectance while maintaining excellent resolution and pattern characteristics, often resulting in uneven film thickness and potential color mixing due to inadequate light leakage prevention.
Innovation Solution
A quantum dot barrier rib structure comprising a cured film formed from a photosensitive resin composition including a copolymer, photopolymerizable compound, photopolymerization initiator, and black colorant, with specific optical density and reflectance measurements to ensure high light-shielding and low reflectance, achieved through a multilayer cured film process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the film thickness is increased to prevent light leakage and maintain high light-shielding property, then light-shielding performance is improved, but uniform coating becomes difficult and stains or contamination are generated
Solution Approach 1:
The barrier rib film is divided into multiple layers (first barrier rib film and second barrier rib film) with different thicknesses. The first layer provides base light-shielding with moderate thickness, while the second layer adds enhanced light-shielding capability. This segmentation allows achieving high overall light-shielding property while maintaining coatability and uniformity of each individual layer.
Solution Approach 2:
Different regions of the barrier rib structure have different film thicknesses optimized for their specific functions. The first barrier rib film has a thickness of 3-7 μm for base light-shielding, while the second barrier rib film has a thickness of 1-5 μm for enhanced light-shielding. This local quality variation ensures that each layer contributes optimally to light-shielding without compromising coating uniformity.
2Manufacturing precision
If the film thickness is decreased to achieve uniform coating, then coating uniformity is improved, but light-shielding property deteriorates and color mixing occurs
Solution Approach 1:
The barrier rib film is segmented into multiple layers where the first layer (3-7 μm) provides sufficient base light-shielding to prevent color mixing, and the second layer (1-5 μm) enhances light-shielding property. This segmentation ensures that each layer is thin enough for uniform coating while the combined thickness achieves high light-shielding performance.
Solution Approach 2:
The barrier rib structure uses a composite of multiple photoresist material layers with different thicknesses and properties. The first photoresist material and second photoresist material are combined to create a composite structure that achieves both coating uniformity and high light-shielding property, preventing color mixing while maintaining manufacturing precision.
3Object-affected harmful factors
If a single thick film is used to ensure light-shielding, then light-shielding property is improved, but coating uniformity deteriorates and stains are generated
Solution Approach 1:
Instead of using a single thick film, the barrier rib is segmented into a first barrier rib film (3-7 μm) and a second barrier rib film (1-5 μm). This segmentation transforms one difficult-to-coat thick layer into multiple easier-to-coat thinner layers, achieving the same or better light-shielding property while maintaining coating uniformity and preventing stains.
Solution Approach 2:
The first barrier rib film is formed and cured as a preliminary step before forming the second barrier rib film. This preliminary action creates a stable base layer that ensures uniform coating and proper adhesion, allowing the second layer to be applied uniformly on top without causing stains or contamination.
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 provides a uniform film thickness and effective light-shielding, preventing color mixing and enhancing resolution, suitable for quantum dot displays by adjusting the ratio of specular and scattered reflectance.
Implementation Method 1
a cured film formed from a photosensitive resin composition including a copolymer, photopolymerizable compound, photopolymerization initiator
Data Source
AI summary
The present invention relates to a structure for a quantum dot barrier rib and a process for preparing the same. The structure for a quantum dot barrier rib of the present invention comprises a cured film having a uniform film thickness and an appropriate range of film thickness. Here, the reflectance RSCI measured by the SCI (specular component included) method and the reflectance RSCE measured by the SCE (specular component excluded) method are reduced, and the ratio between them (RSCE/RSCI) is appropriately adjusted, so that it is possible to satisfy such characteristics as high light-shielding property and low reflectance at the same time while the resolution and pattern characteristics are maintained to be excellent. In addition, when the structure for a quantum dot barrier rib is prepared, it is possible to form a multilayer pattern having a uniform film thickness suitable for the quantum dot barrier ribs in a single development process. Thus, it can be advantageously used for a quantum dot display.