Low Birefringence Polymerizable Compound for High Selectivity Optical Films
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Solution Overview
Problem
Current technologies face challenges in producing optical films with low birefringence and high selectivity in reflection wavelength ranges, limiting their applications in projection image display and other optical elements.
Innovation Solution
A novel polymerizable compound with a specific structure, as denoted by Formula (I), is developed, which can be used to create low birefringence liquid crystals. This compound is incorporated into a polymerizable composition that, when cured, forms films with high selectivity in reflection wavelength ranges, suitable for use in half mirrors and other optical applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a polymerizable compound with high birefringence is used to create a retardation film, then the film thickness can be reduced, but the selectivity in reflection wavelength range deteriorates
Solution Approach 1:
The invention changes the fundamental parameter of birefringence from high to low by selecting specific liquid crystal compounds with low birefringence values. This parameter change enables the creation of films that achieve both thin thickness and high reflection wavelength selectivity, resolving the contradiction between reduced film thickness and maintained selectivity.
2Manufacturing precision
If a polymerizable compound with low birefringence is used, then the selectivity in reflection wavelength range is improved, but the film thickness increases
Solution Approach 1:
The invention uses composite material systems combining specific low-birefringence liquid crystal compounds with polymerizable compounds. This composite approach enables the formulation of compositions that, when cured, produce films with optimized properties achieving both thin thickness and high reflection wavelength selectivity simultaneously.
3Ease of manufacture
If conventional polymerizable compounds are used, then the ease of manufacture is maintained, but the color accuracy and selectivity in projection image display deteriorates
Solution Approach 1:
The invention changes the chemical structure parameters of the polymerizable compound by introducing specific structural features (such as cyclic structures with particular substituent patterns) that result in low birefringence. These parameter changes maintain ease of manufacture through standard polymerization processes while dramatically improving color accuracy and reflection wavelength selectivity.
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 films produced using this compound exhibit selective reflection with a narrow wavelength range, enhancing their suitability for projection image display and other optical elements by providing high selectivity and color accuracy.
Implementation Method 1
The birefringence of the polymerizable compound is one of properties closely associated with the optical properties of an optical film to be obtained
Implementation Method 2
a polymerizable compound having liquid crystallinity
Implementation Method 3
it is possible to obtain a reflection film having high selectivity in a reflection wavelength range
Implementation Method 4
a polymerizable composition containing the novel polymerizable compound
Data Source
AI summary
The present invention provides a polymerizable compound denoted by Formula (I): in the formula, Z1 and Z2 represent an arylene group, and the like, m represents 1 or 2, n represents an integer of 0 or 1, and when m is 2, n is 0, L1, L2, L3, and L4 each independently represent a linking group such as —C(═O)O— and —OC(═O)—, T3 represents -Sp4-R4, X represents —O—, and the like, r represents 1 to 4, Sp1, Sp2, Sp3, Sp4, and Sp5 each independently represent a single bond or a linking group, R1 and R2 each independently represent a polymerizable group, and R3, R4, and R5 each independently represent a hydrogen atom, a polymerizable group, or the like; a polymerizable composition containing the polymerizable compound described above; a film formed of the polymerizable composition described above; and a half mirror for displaying a projection image including the film described above.