Thermally Curable Resin Composition for LCD Protective Film Planarization
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Solution Overview
Problem
Current protective films for color liquid crystal display (LCD) devices require a separate application process for a white portion and do not achieve adequate planarization, especially as display sizes increase, limiting their effectiveness in producing white light without lighting up all RGB pixels.
Innovation Solution
A thermally curable resin composition comprising a binder resin and polyfunctional monomers, with specific weight ratios and molecular weights, is used to create a protective film that can achieve excellent planarization and emit white light without requiring all RGB pixels to be lit or a separate white portion application, enhancing fluidity and adhesion while maintaining transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional protective film is used for color filter planarization, then the film can be applied to the substrate, but it requires a separate application process for white portions and does not achieve adequate planarization
Solution Approach 1:
The protective film composition is designed to simultaneously achieve planarization and serve as a white light emitting layer. The binder resin containing aromatic rings absorbs light to emit white light, eliminating the need for separate white portion application processes while maintaining excellent planarization properties.
Solution Approach 2:
The patent combines the planarization function and white light emission function into a single protective film layer. By incorporating light-absorbing binder resin with aromatic rings into the protective film composition, the film performs both planarization and white light emission without requiring additional layers or processes.
2Quantity of substance
If the solid content of the resin composition is increased to improve film formation, then the film coverage is enhanced, but the viscosity increases reducing fluidity
Solution Approach 1:
The patent optimizes the solid content parameter to a specific range of 10-30% to achieve the desired balance between film formation and fluidity. This parameter optimization ensures adequate film coverage while maintaining sufficient fluidity for proper application and planarization.
3Strength
If the binder resin molecular weight is increased to improve adhesion, then the bonding strength is enhanced, but the fluidity of the composition is reduced
Solution Approach 1:
The patent specifies a molecular weight range of 5,000-10,000 for the binder resin to achieve optimal balance between adhesion and fluidity. This parameter control ensures sufficient bonding strength while maintaining adequate composition fluidity for proper film formation and planarization.
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 protective film with excellent planarization and transparency, enabling the emission of white light without the need to light all RGB pixels or perform a separate white portion application, thus optimizing the manufacturing process and reducing costs for large-area LCDs.
Implementation Method 1
The binder resin is a copolymer of an epoxy group-containing unsaturated compound and an ethylenic unsaturated compound, is obtained by copolymerizing a mixture including the epoxy group-containing unsaturated compound and the ethylenic unsaturated compound
Implementation Method 2
A thermally curable resin composition for a protective film
Data Source
AI summary
The present invention provides an overcoat film which has excellent degree of planarization by optimizing the molecular weight of a binder resin included in a thermally curable resin composition for a protective film and the content of each component including the same. In a color filter according to the present invention, it is not necessary to light up all the red, green, and blue (RGB) pixels for eliciting a white light and perform a separate application process of a white portion because an overcoat film according to the present invention may serve as the white portion.