Anti-glare Optical Multilayer Body with Concavoconvex Surface
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Solution Overview
Problem
Conventional anti-dazzling laminates for image display devices, such as LCDs and CRTs, face challenges in preventing glare while maintaining high contrast and black color reproduction, especially as panel resolution increases, leading to issues like 'glare' and poor contrast due to the tradeoff between glare prevention and contrast improvement.
Innovation Solution
An optical laminate with a light transparent base material and an anti-dazzling layer having a concavoconvex shape, formed using a composition of resin and fine particles with a refractive index difference between 0.05 and 0.2, and specific surface roughness parameters (Sm, θa, Rz) to achieve excellent anti-glare properties and glossy black color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the concavoconvex shape of the anti-dazzling layer is made finer to meet higher panel resolution demands, then panel resolution definition is improved, but glare occurs due to the concavoconvex shape functioning as fine lenses that disturb displayed pixels
Solution Approach 1:
The patent changes the refractive index parameter of the anti-dazzling layer material to be lower than that of the base material. This parameter change transforms the optical function of the concavoconvex shape from acting as lens-like structures that cause glare to acting as light scattering structures that prevent glare while maintaining high definition.
2Illumination intensity
If conventional anti-dazzling laminates are used to prevent external light reflection, then visibility is improved, but contrast deteriorates due to whitening and internal scattering effects
Solution Approach 1:
The patent uses a composite material structure where the anti-dazzling layer with lower refractive index is combined with the base material. This composite structure achieves both light scattering for visibility and maintains contrast by controlling the refractive index relationship between layers.
3Manufacturing precision
If the concavoconvex shape fineness is increased for high-definition panels, then image sharpness is improved, but black color reproduction deteriorates due to increased glare and reduced contrast
Solution Approach 1:
By changing the refractive index parameter of the anti-dazzling layer to be lower than the base material, the patent enables the concavoconvex structure to scatter light effectively for high sharpness while maintaining proper light transmission for accurate black color reproduction without the glare that would otherwise wash out dark tones.
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 laminate effectively prevents glare and improves contrast and black color reproduction, enabling high visibility and sharpness in image displays, particularly in high-definition panels, while maintaining a glossy black feeling.
Implementation Method 1
it is common practice to provide a reflection preventive laminate on the outermost surface of an image display device from the viewpoint of reducing image reflection or reflectance using the principle of light scattering or the principle of optical interference
Implementation Method 2
reducing image reflection or reflectance using the principle of light scattering or the principle of optical interference
Data Source
AI summary
An anti-dazzling laminate formed from an optical laminate having a light transparent base material and an anti-dazzling layer provided on the light transparent base material. The optical laminate is produced by providing the light transparent base material and forming the anti-dazzling layer having a concavoconvex shape on the light transparent base material, wherein the concavoconvex shape of the anti-dazzling layer satisfies the following requirements: Sm is not less than 100 μm and not more than 600 μm, θa is not less than 0.1 degree and not more than 1.2 degrees, and Rz is more than 0.2 μm and not more than 1 μm, wherein Sm represents the average spacing of concavoconvexes (or profile irregularities) in the anti-dazzling layer; θa represents the average inclination angle of the concavoconvexes (or profile irregularities); and Rz represents the average roughness of the concavoconvexes (or profile irregularities).