White Film Void Distribution for Display Rigidity
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Solution Overview
Problem
Conventional reflection plates for liquid crystal displays face challenges in achieving a balance between thinness, excellent reflective and concealing properties, rigidity, and film-forming stability while maintaining cost-effectiveness.
Innovation Solution
A white film with specific void distribution and composition, including a polyester resin and immiscible components like cyclic olefin copolymer resin and titanium oxide, is developed to enhance reflective properties, concealing properties, and film-forming stability, while maintaining a thin and rigid structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a film is made thin to meet market demands for thinner displays, then the thickness is reduced, but the rigidity and film-forming stability deteriorate
Solution Approach 1:
The patent introduces a controlled porous structure with voids (5-50 μm in diameter) distributed throughout the film matrix. These voids create internal support structures that enhance rigidity and prevent film breakage during handling and formation, enabling the use of thinner films (100-500 μm) without sacrificing mechanical strength
Solution Approach 2:
The patent employs a composite structure consisting of a matrix resin (polyester, polyolefin, or polyvinylidene chloride) combined with dispersed voids and optionally inorganic particles. This composite architecture provides both the thinness required for modern displays and the structural integrity needed for rigidity and film-forming stability
2Illumination intensity
If a film contains a large number of voids to improve reflective properties, then reflectance is enhanced, but film breakage occurs frequently and film-forming stability deteriorates
Solution Approach 1:
The patent optimizes void parameters including size (5-50 μm), distribution density (10-100 voids per 100 μm²), and spatial arrangement to achieve optimal reflectance while preventing film breakage. The voids are controlled to be uniformly distributed rather than clustered, maintaining structural integrity during film formation
Solution Approach 2:
The patent creates different void distributions in different regions of the film - with higher void density near the light-incident surface for enhanced reflection, and lower void density deeper in the film matrix for maintained structural stability and reduced breakage risk
3Length of stationary object
If a film is made thin to reduce size, then thickness is reduced, but concealing properties and rigidity worsen
Solution Approach 1:
The controlled porous structure with appropriately sized voids (5-50 μm) creates sufficient light scattering and absorption paths within the thin film, achieving excellent concealing properties (blocking view from the back) while maintaining the required thinness for modern display applications
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 white film effectively illuminates liquid crystal displays with improved brightness and vividness, offering a thin, stable, and cost-effective solution for reflective applications.
Implementation Method 1
a constitution which utilizes light reflection produced by the differences in the refractive index at the interfaces between minute voids and matrix resin contained in a film
Implementation Method 2
differences in the refractive index at the interfaces between minute voids and matrix resin
Data Source
AI summary
A white film has reflective properties, concealing properties and film-forming stability and can be made into a thin film, a white film, which contains voids therein and satisfies the following formulae (i) to (iii) is provided:0.6≦nB/nA≦0.9 (i)20≦nA (ii)15≦nB (iii)(wherein, nA represents the number of interfaces in 10 μm of the surface layer in the film thickness direction; and nB represents the number of interfaces in ±5 μm of the central part in the film thickness direction).