Optical Sensor Film Composition Shielding Transmittance Balance
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Solution Overview
Problem
Existing film compositions for optical sensors using resins and particles face challenges in achieving a balance between shielding and transmittance, with low temporal liquid stability leading to particle sedimentation, which affects the detection of light changes in optical sensors.
Innovation Solution
A composition with particles having an average primary particle diameter of 80 to 130 nm or an average major axis length of 50 to 150 nm, comprising 30-60% titanium oxide as white pigments, along with a curable resin, dispersants, and polymerization initiators, to form a film with L* values between 35 to 75 in the CIE 1976 color space, ensuring both shielding and transmittance requirements are met while maintaining stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the film L* value is increased to improve shielding degree, then the optical sensor hiding performance is improved, but the light transmittance decreases making detection difficult
Solution Approach 1:
The patent changes the particle size parameter to a specific range (80-130 nm primary particle diameter) and optimizes the particle content (30-60 mass%) to achieve the target L* value range (35-75), which balances shielding and transmittance requirements
Solution Approach 2:
The patent uses composite particles consisting of titanium oxide core particles combined with silica or zirconia coating layers, creating a multi-layer composite structure that optimizes both shielding performance and light transmittance properties
2Adaptability or versatility
If particles are added to the composition to achieve desired film properties, then the film functionality is improved, but temporal liquid stability decreases causing particle sedimentation
Solution Approach 1:
The patent creates composite particles with a titanium oxide core and a silica or zirconia coating shell, where the coating layer improves dispersibility and prevents aggregation, thereby maintaining temporal liquid stability while achieving desired film functionality
Solution Approach 2:
The patent controls the particle size within a narrow range (80-130 nm) and optimizes the particle content (30-60 mass%), which prevents excessive sedimentation while maintaining film performance requirements
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 excellent temporal liquid stability and controlled light transmittance, enabling effective light detection in optical sensors by balancing shielding and transmittance, and preventing particle sedimentation.
Implementation Method 1
a composition including particles such as titanium oxide has been performed
Implementation Method 2
EP 2 687 548 A1 discloses an organic-inorganic composite comprising inorganic compound particles and a polymer attached to the inorganic compound particles. The inorganic particles have an average particle size of 1 - 200 nm
Implementation Method 3
EP 2 502 963 A1 relates to a photosensitive resin composition comprising a dispersion composition including, inter alia, (A) titanium dioxide particles having an average primary particle diameter of 1 - 100 nm, (B) a graft copolymer
Data Source
Figure 1(a)~1(e)
AI summary
A composition includes at least one of particles having an average primary particle diameter of 50 to 150 nm or particles having an average major axis length of 50 to 150 nm, and a resin, in which the composition has an L* in an L*a*b* color space of CIE 1976 of 35 to 75 in a case of forming a film with a thickness of 3 µm using the composition, and has excellent temporal liquid stability. A film; a cured film; an optical sensor; and a method for producing a film each use the composition.