Photosensitive Resin Composition for Display Light Blocking and Low Reflection
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Solution Overview
Problem
Conventional black photosensitive resin compositions for display elements face challenges in achieving both excellent surface roughness and linearity of patterns while providing light blocking and low-reflection characteristics, often compromising on optical density or pattern quality.
Innovation Solution
A photosensitive resin composition is developed, comprising a combination of a cardo-based binder resin with a higher refractive index and an acryl-based binder resin, along with a black inorganic pigment and an inorganic scatterer, where the primary particle diameter of the pigment is less than 45 nm, and the binder resins are used in specific ratios to balance light blocking and low-reflection properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black photosensitive resin composition is used to achieve light blocking characteristics, then light blocking performance is improved, but surface roughness and pattern linearity deteriorate
Solution Approach 1:
The patent uses a composite binder resin system combining two different resins (resin A and resin B) with complementary properties. Resin A provides adhesion and flexibility, while resin B contributes to surface smoothness and pattern fidelity. This composite approach allows the composition to achieve both excellent light blocking and high pattern quality simultaneously.
Solution Approach 2:
The patent carefully controls the molecular weight, functional group content, and ratio of the binder resins, as well as the particle size distribution of the black pigment. By optimizing these parameters - specifically using resins with controlled molecular weights and a balanced ratio between the two resin types - the composition achieves optimal balance between light blocking performance and surface roughness.
2Object-affected harmful factors
If additional anti-reflection films are applied to reduce reflectance, then low-reflection characteristics are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The photosensitive resin composition is designed to perform multiple functions simultaneously: it provides light blocking, creates precise patterns, ensures surface smoothness, and inherently reduces reflectance. The binder resin composition and pigment selection are optimized to deliver anti-reflection properties without requiring separate anti-reflection films, thereby simplifying the overall device structure.
Solution Approach 2:
The patent combines the light blocking function and the anti-reflection function into a single integrated photosensitive resin composition. By incorporating specific binder resins and black pigments with appropriate refractive indices and surface properties, the composition achieves both functions in one layer, eliminating the need for additional anti-reflection films.
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 composition effectively achieves both light blocking and low-reflection characteristics, maintaining excellent patternability and optical density, thereby enhancing display visibility and reducing reflectance without the need for additional films.
Implementation Method 1
a photopolymerization initiator, (C) a photopolymerizable monomer
Implementation Method 2
an inorganic scatterer, (E)
Data Source
AI summary
Provided are a photosensitive resin composition including (A) a binder resin including a first binder resin and a second binder resin, (B) a photopolymerizable monomer, (C) a photopolymerization initiator, (D) a black inorganic pigment, (E) an inorganic scatterer, and (F) a solvent, wherein the first binder resin has a higher refractive index than the second binder resin, the first binder resin is included in an amount equal to or less than that of the second binder resin, and a primary particle diameter of the black inorganic pigment is less than or equal to 45 nm, a photosensitive resin layer using the same, and a display device including the photosensitive resin layer.