Optical Film with 490–510 nm Absorption for OLED Reflection
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Solution Overview
Problem
Existing OLEDs face issues with high external light reflectance due to metal electrodes, leading to reduced contrast ratios and increased material costs when using circular polarizing plates, which also limit flexibility and color tone adjustment.
Innovation Solution
An optical film is developed with dyes or pigments absorbing specific wavelengths (490-510 nm) to minimize viewing angle-dependent color changes and external light reflection, maintaining flexibility and reducing material costs by omitting circular polarizing plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizing plate is laminated to suppress external light reflection, then the contrast ratio is improved, but the material cost increases and flexibility is reduced
Solution Approach 1:
The patent extracts the essential function of suppressing external light reflection from the complex circular polarizing plate structure and implements it through a simplified adhesive film containing specific dyes or pigments. This extraction maintains the anti-reflection effect while eliminating the need for costly and rigid circular polarizing plates, thereby reducing material cost and preserving flexibility.
Solution Approach 2:
The patent replaces expensive circular polarizing plates with a cost-effective adhesive film formulation containing specific dyes or pigments. This substitution uses cheaper materials to achieve the same functional outcome of suppressing external light reflection, directly addressing the contradiction between performance improvement and material cost increase.
2Object-affected harmful factors
If a circular polarizing plate is used to reduce external light reflection, then the contrast ratio is improved, but the ability to flexibly adjust color tones is lost
Solution Approach 1:
The patent enables color tone adjustment by changing the parameters of the dye or pigment selection in the adhesive film. Different dyes or pigments with specific absorption characteristics can be chosen to achieve desired color tones while maintaining the anti-reflection function, providing flexibility that was lost with fixed circular polarizing plates.
Solution Approach 2:
The adhesive film serves multiple functions simultaneously: it provides structural adhesion, suppresses external light reflection, and enables color tone adjustment through dye or pigment selection. This multi-functionality replaces the specialized circular polarizing plate while adding the capability for color tone customization.
3Device complexity
If existing anti-reflection optical films with dyes and pigments are used, then material cost is reduced, but viewing angle properties deteriorate
Solution Approach 1:
The patent applies local quality by selecting dyes or pigments with specific absorption characteristics targeted at the green wavelength region (490-510 nm). This localized spectral absorption approach optimizes viewing angle properties by specifically addressing the wavelength range that causes viewing angle-dependent color changes, while maintaining cost-effectiveness through the use of dye/pigment formulations rather than expensive circular polarizing plates.
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 optical film effectively suppresses external light reflection while maintaining luminance and flexibility, minimizing color changes and reducing material costs in OLED devices.
Implementation Method 1
including a dye or pigment absorbing at least some of a wavelength of 490 nm to 510 nm
Data Source
AI summary
The present specification relates to an optical film, and a display device including an optical film, comprising a dye or pigment absorbing at least some of a wavelength of 490 nm to 510 nm; having a transmission color of a D65 light source, a CIE standard illuminant, of −8<a*<8 and −8<b*<8, wherein a* indicates a direction the transmission color is leaned between red and green and b* indicates a direction the transmission color is leaned between yellow and blue; and satisfying the following Equations 1 and 2:T%(500 nm)<T%(530 nm), [Equation 1][T%(500 nm)×1.8]<[T%(460 nm)+T%(610 nm)] [Equation 2]wherein, in Equations 1 and 2,T % (A nm) is transmittance at a wavelength of A nm.