Optical Member Composition for Polarizer-Free Display Glare Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Light emitting displays, such as organic light emitting displays, suffer from poor screen quality due to total reflection of external light at the panel surface, necessitating the use of a polarizing plate which may not be ideal.
Innovation Solution
An optical member comprising an adhesive layer, a transmittance control layer, and a base film, where the transmittance control layer includes a (meth)acrylic copolymer and a dye mixture with specific dyes and monomers, and a UV absorber in the adhesive layer, eliminating the need for a polarizing plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polarizing plate is used to prevent total reflection of external light, then screen quality is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent removes the polarizing plate from the display device structure and replaces it with an optical member comprising a transmittance control layer and base film. This extraction of the problematic component resolves the contradiction by eliminating the need for complex polarizing plate manufacturing and assembly while achieving the desired light control functionality through the simplified optical member structure.
Solution Approach 2:
The patent changes the optical parameters of the display device by using a transmittance control layer with specific dye compositions that absorb light at wavelengths of 400-700 nm. This parameter change allows the device to control light transmission without requiring a polarizing plate, thereby improving screen quality while reducing device complexity.
2Illumination intensity
If a polarizing plate is used to control light transmission, then screen quality is improved, but the lifespan of the light emitting device decreases due to UV damage
Solution Approach 1:
The patent converts the harmful UV radiation into a beneficial protective mechanism by incorporating a UV absorber in the adhesive layer. The UV absorber captures UV light that would otherwise damage the light emitting device, transforming this harmful factor into a protective feature that extends device lifespan while maintaining screen quality through the transmittance control layer.
Solution Approach 2:
The patent introduces a UV absorber as an intermediary component in the adhesive layer between the external light source and the light emitting device. This intermediary absorbs UV radiation and prevents it from reaching and damaging the light emitting device, thereby extending device lifespan while the transmittance control layer maintains optimal screen quality.
3Illumination intensity
If a transmittance control layer with dye mixture is used, then light transmission is controlled and screen quality is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses a composite transmittance control layer comprising a polymer matrix combined with specific dye compounds (porphyrin dyes, BODIPY dyes, tetraazaporphyrin dyes, and copper complex dyes). This composite material approach allows for tunable light transmission properties through selection of dye components and concentrations, achieving precise light control while maintaining manufacturability through standard coating processes.
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 member provides improved screen quality and protection against external light damage, maintaining low light transmittance variation and enhancing the lifespan of the light emitting device.
Implementation Method 1
the dye mixture includes a first dye having a maximum absorption wavelength of 400 nm to 440 nm, a second dye having a maximum absorption wavelength of 480 nm to 520 nm, a third dye having a maximum absorption wavelength of 570 nm to 610 nm, and a fourth dye having a maximum absorption wavelength of 650 nm to 700 nm
Implementation Method 2
The adhesive layer may include a UV absorber
Data Source
AI summary
An optical member, including an adhesive layer, and a transmittance control layer and a base film sequentially on an upper surface of the adhesive layer, wherein the transmittance control layer includes a (meth)acrylic copolymer and a dye mixture, the dye mixture includes a first dye having a maximum absorption wavelength of 400 nm to 440 nm, a second dye having a maximum absorption wavelength of 480 nm to 520 nm, a third dye having a maximum absorption wavelength of 570 nm to 610 nm, and a fourth dye having a maximum absorption wavelength of 650 nm to 700 nm, and the (meth)acrylic copolymer is a copolymer of a monomer mixture including 50 mol % to 90 mol % of an alkyl group-containing (meth)acrylic monomer and 10 mol % to 50 mol % of an aromatic group-containing (meth)acrylic monomer, all mol % being based on 100 mol % of the monomer mixture.