Hybrid Light Control and Color Shifting Film Stack
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Solution Overview
Problem
Conventional light control films (LCFs) used for privacy in displays reduce brightness and resolution when used in front of displays, and they typically provide a 'black out' view for off-axis viewers, which is not desirable for maintaining high light transmission and display resolution while ensuring privacy.
Innovation Solution
A film stack combining a light control film (LCF) and a color shifting film, where the LCF and color shifting film are proximate or adhered together with an adhesive layer, enhancing privacy by maintaining high light transmission and providing a colorful, vivid appearance for off-axis viewers by reflecting ambient light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional light control film (LCF) is used for privacy in displays, then privacy function is improved, but brightness and resolution are reduced
Solution Approach 1:
The patent combines a light control film (LCF) with a color shifting film to create a hybrid film stack. The LCF provides privacy through directional light control, while the color shifting film maintains brightness and resolution by shifting wavelengths rather than blocking light. This merging of two different optical mechanisms resolves the contradiction between privacy function and brightness.
Solution Approach 2:
The invention uses a composite structure consisting of multiple layers: a light control film layer and a color shifting film layer. Each layer performs a specific optical function, and their combination creates a system that simultaneously achieves privacy (from LCF) and high brightness/resolution (from color shifting film). This composite approach allows the system to overcome the limitations of individual materials.
2Reliability
If a conventional light control film (LCF) is used for privacy, then privacy function is improved, but display resolution is reduced
Solution Approach 1:
The hybrid film stack merges the directional control capability of LCF with the wavelength-shifting capability of the color shifting film. This combination maintains display resolution because the color shifting film preserves spatial information while changing light wavelengths, unlike conventional LCFs that block light and reduce resolution.
Solution Approach 2:
The color shifting film changes the wavelength parameter of transmitted light without significantly affecting spatial resolution. By shifting wavelengths rather than blocking light, the system maintains display resolution while achieving privacy through the angular selectivity of the LCF layer.
3Reliability
If a conventional light control film provides a 'black out' view for off-axis viewers, then privacy is achieved, but a colorful and vivid appearance is lost
Solution Approach 1:
The color shifting film causes off-axis viewers to see shifted colors rather than a black out view. As viewing angle increases, the film shifts transmitted light wavelengths, creating a colorful, vivid appearance that changes with angle. This resolves the aesthetic quality issue while maintaining privacy through the angular selectivity of the LCF.
Solution Approach 2:
The patent converts what would normally be a harmful effect (light leakage at oblique angles reducing privacy) into a beneficial aesthetic effect. The color shifting film transforms off-axis light into shifted wavelengths that create a colorful appearance, turning the privacy weakness into an aesthetic feature while the LCF maintains angular selectivity for privacy.
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 hybrid privacy filter achieves a better-defined viewing angle cut-off and privacy function compared to standalone LCFs, maintaining high on-axis light transmission and providing effective privacy while offering a colorful appearance by reflecting ambient light, thus enhancing both privacy and display visibility.
Implementation Method 1
providing a colorful, vivid appearance for off-axis viewers by reflecting ambient light effectively
Implementation Method 2
the LCF may provide for maximum transmission at a predetermined angle of incidence with respect to the image plane and provide for image cut-off or black-out along a given polar coordinate
Data Source
AI summary
Film stacks and displays incorporating the same are described. More specifically film stacks that combine a light control film and a color shifting film proximate to one another and, in some embodiments, adhered together are described, as well as displays incorporating such film stacks. Such film stacks may combine the “blacking out” functionality of a conventional louver film (LCF) and the color shifting effect of a multilayer optical film (MOF).