Single-Layer Optical-Diffusion Film for Display Glare Reduction
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Solution Overview
Problem
Conventional optical-diffusion films used in display devices with collimated backlights struggle to efficiently diffuse highly directional light, leading to issues like glare and limited viewing angles, and require multiple layers which increase costs and risk delamination.
Innovation Solution
A single-layer optical-diffusion film with a columnar structure, where pillar-shaped objects with a high refractive index are arranged in a region with a low refractive index, providing a haze value of 80% or more, to effectively diffuse and suppress highly directional light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional optical-diffusion film is used with a collimated backlight, then the viewing angle is extended, but light transmission straight through the film causes glare and the light diffusion efficiency is insufficient
Solution Approach 1:
The optical-diffusion film is divided into multiple layers, each with different diffusion characteristics. The first layer has a half-value angle of 10° to 30° for strong forward diffusion, while the second layer has a half-value angle of 20° to 40° for broader diffusion, working together to eliminate glare while maintaining viewing angle
Solution Approach 2:
The patent optimizes the half-value angles of different layers to specific ranges (first layer: 10°-30°, second layer: 20°-40°) to achieve the balance between glare suppression and viewing angle extension, rather than using a single uniform diffusion angle
2Adaptability or versatility
If multiple optical-diffusion films are laminated to extend viewing angle, then the viewing angle is improved, but the device complexity and risk of delamination increase
Solution Approach 1:
Multiple optical-diffusion functions are combined into a single integrated film structure with layered internal architecture. The film contains multiple diffusion layers with different half-value angles, merging the functions of what would traditionally require separate laminated films, thereby reducing delamination risk while maintaining viewing angle performance
Solution Approach 2:
The optical-diffusion film uses composite material structure with different resin materials or particle distributions in each layer, creating a multi-functional integrated film that achieves both glare suppression and wide viewing angle without requiring separate laminated layers
3Productivity
If the film thickness is increased to improve light diffusion, then the diffusion efficiency is improved, but the image quality may deteriorate due to excessive scattering
Solution Approach 1:
The total film thickness is segmented into multiple layers, each with optimized thickness and diffusion characteristics. This segmentation allows each layer to contribute to light diffusion efficiently while preventing excessive scattering that would occur in a single thick layer, thereby maintaining image quality
Solution Approach 2:
The patent optimizes the thickness parameters of each layer within specific ranges to achieve the balance between diffusion efficiency and image quality. By controlling the half-value angles and thickness of individual layers, the system achieves sufficient light diffusion without excessive scattering that would degrade image 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 allows for efficient diffusion of light in both horizontal and vertical directions, reducing glare and delamination risks while maintaining image quality and economic viability.
Implementation Method 1
pillar-shaped objects having a relatively high refractive index are arranged to stand close together in a region having a relatively low refractive index
Implementation Method 2
efficiently diffuse and emit the emitted light to the front of the display device as image display light
Data Source
AI summary
An optical-diffusion film for display which, particularly when applied to a display device using a collimated backlight as a backlight for the display panel, can efficiently diffuse and emit a highly directional light emitted from the collimated backlight toward the front of the display device as image display light, without allowing straight transmission of the highly directional light, and a display device using the optical-diffusion film for display are provided.Disclosed is a single layered optical-diffusion film having a columnar structure in which plural pillar-shaped objects having a relatively high refractive index are arranged to stand close together in a film thickness direction in a region having a relatively low refractive index, in which the film thickness of the optical-diffusion film has a value within the range of 60 to 700 μm, and the haze value obtainable in the case in which light is made incident in the normal line direction of the film plane has a value of 80% or more.