Polyimide Coloring Resin Composition for Crack-Resistant Color Filter Films
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Solution Overview
Problem
The existing coloring resin compositions used in the manufacturing of solid-state imaging elements face a narrow process window when subjected to high-temperature heating treatments, leading to film contraction and cracking, particularly when acrylic resins are used.
Innovation Solution
Employing a polyimide or polyimide precursor with specific repeating units in the resin composition, which suppresses resin decomposition and expands the process window to higher temperatures, reducing film contraction and cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acrylic resin is used in the coloring resin composition, then the film can be manufactured with good initial properties, but the film contracts and cracks when subjected to high-temperature heating treatment
Solution Approach 1:
The patent changes the chemical composition parameters of the resin by incorporating polyimide or polyimide precursor resins with specific repeating units (Formulae 1-1 and 1-2) into the coloring resin composition. This parameter change enables the film to withstand high-temperature heating treatment without contraction or cracking, as the polyimide structure provides thermal stability that acrylic resin lacks.
Solution Approach 2:
The patent creates a composite resin system by combining acrylic resin with polyimide or polyimide precursor resins in specific ratios. This composite material approach allows the film to benefit from both the good initial manufacturing properties of acrylic resin and the high-temperature stability of polyimide, preventing film contraction and cracking during high-temperature processing.
2Manufacturing precision
If the coloring material content is increased to improve color strength, then the optical density increases, but the film becomes more prone to decomposition at high temperatures
Solution Approach 1:
The patent adjusts the compositional parameters by specifying that the coloring material content should be 30 mass % or more of the total solid content, while simultaneously defining the resin composition to include polyimide or polyimide precursor with specific repeating units. This parameter optimization allows achieving high optical density while maintaining resin stability at high temperatures through the thermally stable polyimide structure.
3Adaptability or versatility
If the process window is expanded to higher temperatures to enable subsequent high-temperature steps, then more manufacturing processes become accessible, but existing acrylic-based films decompose and lose thickness
Solution Approach 1:
The patent changes the thermal parameter characteristics of the film by incorporating polyimide or polyimide precursor resins, which have inherently higher thermal stability than acrylic resin. This allows the process window to be expanded to higher temperatures (300°C or above) without significant film thickness loss, enabling subsequent high-temperature manufacturing steps.
Solution Approach 2:
The patent provides beforehand cushioning against high-temperature decomposition by pre-forming the film with a resin composition containing polyimide or polyimide precursor that is resistant to high-temperature degradation. This preparatory measure prevents film thickness loss during subsequent high-temperature processing steps.
Data Source
AI summary
Provided are a coloring resin composition including a resin, a coloring material, and a solvent, in which the resin is a polyimide or polyimide precursor including a repeating unit represented by Formula (1-1) or Formula (1-2), and a content of the coloring material is 30 mass % or more with respect to a total solid content of the composition; a film; a color filter; a solid-state imaging element; and an image display device.