Optical Film Lens Pattern Design for Display Contrast
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Solution Overview
Problem
Conventional liquid crystal display (LCD) technologies face challenges in widening both front and side viewing angles while maintaining high contrast ratio and visibility, as existing optical films often couple side luminance with front luminance, leading to decreased contrast ratio due to unnecessary lens portion structures and distances.
Innovation Solution
An optical film with a base film and a cover film having different refractive indices, featuring lens pattern portions with specific angles and distances, and engraved pattern portions that optimize light emission angles to improve side visibility and front luminance without unnecessary upper parts, thereby enhancing contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional optical films use lens portions with upper parts and larger distances between lens portions, then side viewing angle is improved, but contrast ratio decreases due to coupling of side luminance with front luminance
Solution Approach 1:
The patent removes the unnecessary upper parts from the lens portions of conventional optical films. By extracting only the essential lower part of the lens structure that is sufficient for achieving the desired side viewing angle, the design eliminates the source of harmful light coupling while maintaining the beneficial viewing angle expansion effect.
Solution Approach 2:
The patent optimizes the distance between adjacent lens portions by reducing it to a specific range (1/10 to 1/5 of the lens height). This parameter change allows the lens portions to work more efficiently in directing light to side viewing angles without causing excessive light leakage that would couple with front luminance and reduce contrast ratio.
2Adaptability or versatility
If lens portions are designed with larger size and distance to widen viewing angle, then side visibility is improved, but front luminance decreases due to unnecessary structures
Solution Approach 1:
The patent extracts and removes the unnecessary upper parts of the lens portions that do not contribute to side viewing angle improvement. This extraction eliminates wasted material and structural complexity while preserving the essential light-directing function needed for side visibility enhancement.
Solution Approach 2:
The patent applies partial action by using only the necessary portion of the lens structure (the lower part) rather than the complete conventional lens design. This partial implementation is sufficient to achieve the desired side viewing angle and visibility improvement without the detrimental effects of the full conventional design on front luminance.
3Ease of manufacture
If conventional optical films use standard lens structures, then manufacturing is simple, but contrast ratio and visibility are insufficient
Solution Approach 1:
The patent segments the optical film into distinct functional regions: the base film layer and the lens pattern layer with modified portions. This segmentation allows each layer to be optimized independently for its specific function while maintaining overall manufacturing simplicity through established lamination processes.
Solution Approach 2:
The patent modifies key parameters of the lens portions including reducing the distance between adjacent lenses to 1/10 to 1/5 of the lens height, and removing upper parts. These parameter changes improve contrast ratio and visibility while remaining compatible with conventional manufacturing techniques such as lamination and molding.
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 improves the contrast ratio and visibility of display devices by optimizing light emission angles and refractive index differences, widening the side viewing angle while maintaining excellent front luminance.
Implementation Method 1
a base film including a base and first and second lens pattern portions, which protrude from a surface of the base in a first direction to be spaced apart from each other, and a cover film disposed on the base film... a refractive index of the base film may be lower than a refractive index of the cover film
Data Source
AI summary
An optical film includes a base film including a base and first and second lens pattern portions, where the first lens pattern portion includes a first surface, a first side surface, which extends from one side of the first surface to a surface of the base and a second side surface, which extends from the other side of the first surface and the surface of the base, the second lens pattern portion includes a second surface, a third side surface, which extends from one side of the second surface to the surface of the base, and a fourth side surface, which extends from the other side of the second surface and the surface of the base, and an angle between an imaginary line and the surface of the base is less than about 50 degrees.