Optical Film Prism Pattern and Diffusion Layers for Backlight Thickness Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The removal of the upper diffusion sheet in backlight units to reduce thickness leads to optical interference and color non-uniformity phenomena, deteriorating display quality in liquid crystal display devices.
Innovation Solution
An optical film with a prism pattern layer, a first diffusion layer, and a second diffusion layer on opposite surfaces of a base film, where the pattern direction of the prism layer and the optical axis direction of the base film differ by a predetermined angle, and the layers have different refractive indices to prevent optical interference and color non-uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the upper diffusion sheet is removed to reduce backlight unit thickness, then the thickness is reduced, but optical interference and color non-uniformity phenomena occur deteriorating display quality
Solution Approach 1:
The patent merges the functions of the upper diffusion sheet and the optical film with prism pattern into a single integrated optical film structure. The optical film includes both a prism pattern layer for light direction control and diffusion layers for light diffusion, combining previously separate components to eliminate the need for the upper diffusion sheet while maintaining display quality.
Solution Approach 2:
The optical film uses composite material structure with multiple layers having different refractive indices: a prism pattern layer with first refractive index, a base film with second refractive index, and diffusion layers with third refractive index. This composite structure enables simultaneous achievement of light direction control and light diffusion functions within a single thin film component.
2Ease of operation
If multiple films are laminated to form the optical film, then light diffusion and direction control are achieved, but optical interference phenomena occur
Solution Approach 1:
The patent applies local quality by creating angular dependence in the refractive index relationship. The optical film is designed so that the refractive index relationship between layers is optimized for specific viewing angles, allowing effective light diffusion and direction control in the forward direction while minimizing optical interference phenomena through the angular dependence of the refractive index matching.
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
This configuration reduces the thickness of the backlight unit while maintaining improved image quality by effectively diffusing light and preventing optical interference and color non-uniformity phenomena.
Implementation Method 1
a prism pattern layer having one surface on which a plurality of prisms having pattern directions parallel to each other in a first direction are provided
Implementation Method 2
a first diffusion layer provided on the other surface of the prism pattern layer... and a second diffusion layer that is in contact with the other surface of the base film
Implementation Method 3
a base film that is in contact with the first diffusion layer on one surface and has an optical axis direction in a second direction different from the first direction
Data Source
AI summary
An optical film according to various embodiments of the disclosure may include: a prism pattern layer having one surface on which a plurality of prisms having pattern directions parallel to each other in a first direction are provided; a first diffusion layer provided on the other surface of the prism pattern layer; a base film that is in contact with the first diffusion layer on one surface and has an optical axis direction in a second direction different from the first direction; and a second diffusion layer that is in contact with the other surface of the base film. In addition, an optical film and a backlight unit including the optical film according to various embodiments may be provided.