Photosensitive Composition for Flexible Organic EL Pixel Division
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Solution Overview
Problem
Existing photosensitive compositions for forming black pixel division layers in flexible organic EL display devices face challenges in achieving both high flexibility and light emission reliability, particularly when the thickness of the pixel division layer is increased to enhance light reflection suppression, leading to deteriorated patterning properties and light emission reliability.
Innovation Solution
A photosensitive composition containing specific epoxy compounds and resins with long-chain alkyl groups, combined with a photosensitizer, and optionally an inorganic pigment for near-infrared shielding, to form a cured film with improved flexibility, light emission reliability, and pattern linearity, while maintaining low permittivity and light-shielding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the thickness of the pixel division layer is increased to suppress outside light reflection, then the light-shielding property is improved, but the flexibility and light emission reliability are deteriorated
Solution Approach 1:
The patent changes the chemical composition parameters of the photosensitive composition by incorporating specific epoxy compounds with long-chain alkyl groups (C9-C19) and resins with particular structures (formulas 1 and 2). This compositional parameter change enables the pixel division layer to achieve both high light-shielding property and excellent flexibility simultaneously, resolving the contradiction between thickness increase for light shielding and maintaining reliability.
Solution Approach 2:
The patent creates a composite photosensitive composition system combining epoxy compounds, resins with specific structures, photosensitizers, and inorganic pigments. This composite material approach allows the pixel division layer to integrate multiple functions: light shielding, flexibility, and reliability, overcoming the limitations of single-material solutions.
2Object-affected harmful factors
If the thickness of the pixel division layer is increased to enhance light-shielding property, then the light-shielding property is improved, but the patterning properties are deteriorated
Solution Approach 1:
The patent optimizes the chemical composition parameters of the photosensitive composition, specifically using epoxy compounds with C9-C19 long-chain alkyl groups and resins with structures of formulas 1 and 2. These parameter changes improve the flow and curing characteristics, enabling excellent patterning properties even at increased thicknesses while maintaining high light-shielding performance.
3Object-affected harmful factors
If a polarizing plate is added to prevent outside light reflection, then the light-shielding property is improved, but the display luminance is decreased
Solution Approach 1:
The patent extracts the light-shielding function from the polarizing plate and transfers it to the pixel division layer itself by incorporating inorganic pigments and optimizing the layer composition. This eliminates the need for a separate polarizing plate, maintaining high display luminance while achieving effective outside light reflection suppression.
Solution Approach 2:
The patent makes the pixel division layer multi-functional by integrating light-shielding properties directly into it through compositional optimization and pigment incorporation. This eliminates the need for separate functional layers, maintaining simplicity and high luminance while achieving effective light reflection suppression.
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 achieves a highly flexible and reliable pixel division layer with excellent light emission properties, suppressing outside light reflection and maintaining high pattern linearity, even at increased thicknesses, thereby enhancing the overall performance of flexible organic EL display devices.
Implementation Method 1
a photosensitive composition containing at least one compound selected from the group of the following (a-1) to (a-3) and containing (b) a photosensitizer
Data Source
AI summary
A photosensitive composition containing at least one compound selected from the group of the following (a-1) to (a-3) and containing (b) a photosensitizer:(a-1) an epoxy compound having a C9-C19 long-chain alkyl group,(a-2) a resin having a structure represented by the following general formula (1), and(a-3) a resin having a structure represented by the following general formula (2).A photosensitive composition capable of forming a pixel division layer that has high flexibility and affords excellent light emission reliability to an organic EL display device is provided.