Photosensitive Composition for Light Sensor Filters
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Solution Overview
Problem
Existing light filters for infrared light sensors have insufficient light blocking effects in the visible wavelength range and high pixel density is compromised when trying to improve this, making it difficult to achieve both high resolution and thin, lightweight designs for miniaturized sensors.
Innovation Solution
A photosensitive composition comprising a colorant with a perylene structure, combined with blue and yellow/red colorants, which forms a hardened film that effectively blocks visible light while transmitting near-infrared light, allowing for high pixel density and thin, lightweight light filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the contents of blue colorant, yellow colorant and red colorant are increased to improve light blocking effect in visible range, then light blocking effect is improved, but resolution decreases and it becomes difficult to obtain high density of pixels
Solution Approach 1:
The patent changes the chemical structure parameters of the colorants by introducing specific functional groups (carboxyl group, hydroxyl group, or carbonyl group) to the perylene core structure. This chemical modification allows the colorant to achieve superior light blocking performance with lower concentration, thereby maintaining high resolution while improving light blocking effect in the visible range.
Solution Approach 2:
The patent creates a composite colorant system by combining perylene-based colorants with specific functional groups (carboxyl, hydroxyl, or carbonyl) and controlling their ratios in the photosensitive composition. This composite approach enables synergistic light blocking across the visible spectrum while maintaining pixel density and resolution.
2Weight of moving object
If a thin light filter is formed to reduce size and weight for miniaturization, then device miniaturization is achieved, but light blocking effect in visible range becomes insufficient
Solution Approach 1:
The patent modifies the optical parameters of the colorant by introducing functional groups with high light absorption coefficients. The perylene-based colorants with carboxyl, hydroxyl, or carbonyl groups exhibit enhanced light blocking capability, allowing thin film formation while maintaining sufficient light blocking effect in the visible range.
Solution Approach 2:
The patent utilizes the optical properties of perylene-based colorants that undergo changes in light absorption characteristics. The functional groups modify the electronic structure of the colorant, enhancing its ability to absorb visible light while transmitting near-infrared light, enabling thin filter design with effective visible light blocking.
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 enables sufficient light blocking in the visible range and transmission in the near-infrared region, maintaining high resolution and allowing for the miniaturization of light sensors, suitable for various applications including remote controllers and inter-vehicular distance detection sensors.
Implementation Method 1
a compound having an ethylenic unsaturated group, a photopolymerization initiator
Implementation Method 2
the colorant contains the following (A1) to (A3)... capable of sufficiently blocking light in the visible range and sufficiently transmitting light in the near infrared region
Data Source
AI summary
A photosensitive composition, suitable for a hardened film capable of sufficiently blocking light in the visible range and sufficiently transmitting light in the near infrared region, is provided. The photosensitive composition contains a colorant, a compound having an ethylenic unsaturated group, a photopolymerization initiator and a solvent. The colorant contains (A1) to (A3);(A1) a colorant of the following formula (1):(A2) a blue colorant, a green colorant, or both, and(A3) a yellow colorant, a red colorant, or both. R1 and R2 is a hydrogen atom, a hydroxyl group, a methoxy group or an acetyl group. R3 and R4 is a phenylene group or a direct bond. R5 and R6 is a direct bond or an alkanediyl group having 1 to 10 carbon atoms, with the proviso that R3 and R5 are not simultaneously direct bonds, and R4 and R6 are not simultaneously direct bonds.