Antiglare Light Diffusing Member Surface Roughness Control
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Solution Overview
Problem
Existing antiglare light diffusing members for displays face challenges in achieving optimal visibility by preventing external light reflection, maintaining good contrast, and avoiding dazzling, while also ensuring abrasion resistance and cost-effectiveness.
Innovation Solution
An antiglare light diffusing member comprising a transparent base material with a binder matrix and particles, where the arithmetic average roughness (Ra1) is less than 0.008 μm, Ra2 is between 0.1-0.5 μm, and internal haze is 1-7%, utilizing particles with different refractive indices and diameters to control surface and internal scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If surface irregularity is increased to improve light diffusing performance, then external light reflection is prevented, but contrast is lowered and image sharpness deteriorates
Solution Approach 1:
The light diffusing function is segmented into two independent mechanisms: surface scattering (controlled by surface irregularity) and internal scattering (controlled by particles within the layer). This allows each mechanism to be optimized independently, with surface irregularity minimized to preserve image sharpness while particles provide the necessary light diffusion to prevent external light reflection.
Solution Approach 2:
The invention transitions from relying solely on two-dimensional surface irregularity to incorporating three-dimensional internal structure (particles distributed within the binder matrix). This internal scattering mechanism provides light diffusion without compromising the smooth surface quality needed for maintaining image sharpness and contrast.
2Object-affected harmful factors
If particles are added to the binder matrix to improve light diffusing performance, then external light reflection is prevented, but manufacturing complexity increases
Solution Approach 1:
The invention combines the binder matrix and particles into a single integrated light diffusing layer that can be applied in one coating process. This merged structure eliminates the need for separate surface treatment steps and simplifies manufacturing while achieving effective light diffusion through internal scattering.
3Object-affected harmful factors
If surface irregularity is made large to improve light scattering, then light diffusing performance is enhanced, but abrasion resistance is reduced
Solution Approach 1:
The light scattering function is separated from the surface structure and relocated to internal particles. This segmentation allows the surface to remain smooth and intact for abrasion resistance, while the particles embedded within the binder matrix provide the necessary light scattering performance.
4Object-affected harmful factors
If more particles are added to improve light diffusing performance, then external light reflection is prevented, but contrast is lowered
Solution Approach 1:
The invention optimizes particle parameters including size distribution (0.1-10 μm), concentration (1-50 wt%), and refractive index difference from the binder matrix. By carefully controlling these parameters, sufficient light scattering is achieved to prevent external light reflection while maintaining image contrast and sharpness.
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 effectively prevents external light reflection, maintains good contrast, suppresses dazzling, and enhances abrasion resistance, resulting in improved visibility and display performance without compromising image quality or increasing production costs.
Implementation Method 1
utilizes internal scattering (internal diffusion) of light based on the difference in refraction indices of the binder matrix and particles
Implementation Method 2
mixing particles having a refraction index different from that of a binder matrix into the binder matrix
Implementation Method 3
scattering phenomenon (surface diffusion) of light caused by surface irregularity
Data Source
AI summary
An antiglare light diffusing member is disclosed comprising a transparent base material; and an antiglare light diffusing layer including a binder matrix and a particle; wherein, as for the layer, arithmetic average roughness Ra1 (λc: 0.008 mm) on the basis of JIS-B0601-1994 is less than 0.008 μm, Ra2 (λc: 0.8 mm) on the basis of JIS-B0601-1994 is 0.1-0.5 μm and an internal haze is 1-7%.