Photosensitive Resin Composition for OLED Black Pixel Defining Layer
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Solution Overview
Problem
Existing black photosensitive resin compositions for display devices, such as OLEDs, face challenges with heat resistance, out-gas characteristics, and sensitivity, particularly in forming deep patterns and maintaining contrast and visibility due to external light reflection and heat effects.
Innovation Solution
A photosensitive resin composition incorporating a specific photopolymerization initiator represented by Chemical Formula 1, along with a binder resin, photopolymerizable monomer, black colorant, and solvent, optimized for improved heat resistance, sensitivity, and low out-gas characteristics, is developed to enhance pattern formation and device reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional black photosensitive resin compositions are used, then pattern formation is achieved, but heat resistance and out-gas characteristics are insufficient
Solution Approach 1:
The patent changes the chemical parameters of the photopolymerization initiator by selecting specific compounds (Type I: aromatic ketone or Type II: aromatic acid phenyl ester with specific molecular structures) that have different thermal stability characteristics compared to conventional initiators. This parameter change enables the resin composition to maintain structural integrity at high temperatures while minimizing out-gas emissions during curing and operation
Solution Approach 2:
The patent creates a composite photosensitive resin composition by combining specific binder resins (polyimide or polyamic acid), photopolymerizable monomers, and specially selected photopolymerization initiators in optimized proportions. This composite material approach allows the system to achieve both high heat resistance and low out-gas characteristics that cannot be obtained with single-component systems
2Illumination intensity
If black colorant is added to improve contrast, then visibility is enhanced, but sensitivity and pattern formation quality deteriorate
Solution Approach 1:
The patent introduces a specifically selected photopolymerization initiator as an intermediary that mediates between the black colorant and the photopolymerizable monomer. This initiator has optimized light absorption characteristics that allow it to initiate polymerization effectively even in the presence of black pigment, thereby maintaining pattern formation quality while achieving high contrast through the black colorant
Solution Approach 2:
The patent optimizes the concentration parameters of both the black colorant and the photopolymerization initiator to achieve the desired contrast while maintaining sufficient light transmission for pattern formation. By carefully controlling these compositional parameters, the system achieves high contrast without sacrificing manufacturing precision
3Reliability
If conventional photopolymerization initiators are used, then polymerization is achieved, but sensitivity and heat resistance are insufficient
Solution Approach 1:
The patent changes the chemical structure parameters of the photopolymerization initiator by selecting compounds with specific molecular weights, functional groups, and absorption spectra. These parameter changes result in initiators that maintain high quantum efficiency (sensitivity) while exhibiting superior thermal stability (heat resistance) compared to conventional initiators
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 enhanced heat resistance, sensitivity, and reduced out-gas emissions, ensuring improved pattern quality and device performance, including better contrast and visibility in display devices like OLEDs.
Implementation Method 1
a photopolymerization initiator including a compound represented by Chemical Formula 1
Data Source
AI summary
Provided are a photosensitive resin composition including (A) a binder resin; (B) a photopolymerizable monomer; (C) a photopolymerization initiator including a compound represented by Chemical Formula 1; (D) a black colorant; and (E) a solvent, a black pixel defining layer manufactured using the photosensitive resin composition, and a display device including the black pixel defining layer.In Chemical Formula 1, each substituent is the same as defined in the detailed description.