Electronically Switchable Privacy Film with Microstructured Ribs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional privacy films for electronic display devices are static, requiring physical removal and reapplication to switch between privacy and public modes, limiting user convenience and functionality.
Innovation Solution
An electronically switchable privacy film with a pair of transparent electrodes and an optically transparent microstructured layer containing electronically switchable material, which modulates between high and low absorption states upon application of an electric field, allowing seamless switching between privacy and public modes without physical removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a static privacy film is used, then privacy protection is provided, but the film cannot be switched to public mode without physical removal
Solution Approach 1:
The patent applies the dynamics principle by incorporating an electronically switchable material (such as liquid crystal or electrochromic material) that can dynamically change its optical properties between transparent and privacy states when voltage is applied. This eliminates the need for physical removal and reapplication, allowing users to switch between privacy and public modes with simple electrical control.
Solution Approach 2:
The patent utilizes parameter changes by modifying the optical absorption characteristics of the film through electrical field application. The electronically switchable material changes its light absorption parameter from high (privacy mode) to low (public mode) when voltage is applied, enabling seamless transition between modes without physical manipulation.
2Adaptability or versatility
If an electronically switchable material is incorporated, then switching between modes is enabled, but the device complexity increases
Solution Approach 1:
The patent employs flexible shells and thin films by using a thin microstructured layer containing the electronically switchable material sandwiched between transparent electrodes. This thin-film structure maintains simplicity while enabling electronic switching functionality, avoiding bulky complex mechanisms.
Solution Approach 2:
The patent applies composite materials by combining transparent electrodes with a microstructured layer containing electronically switchable material. This composite structure integrates multiple functions (electrical control and optical modulation) in a single compact unit, managing complexity through material integration rather than separate components.
3Illumination intensity
If the microstructured layer is made transparent, then optical clarity is maintained, but the privacy effect at oblique angles must be precisely controlled
Solution Approach 1:
The patent applies local quality by creating a microstructured layer with specifically engineered rib and channel geometries that provide different optical properties at different viewing angles. The microstructure is designed to maintain high transparency at normal viewing angles while providing privacy protection at oblique angles, achieving angle-dependent optical control.
Solution Approach 2:
The patent utilizes curvature principles through the microstructured rib geometry, where the curved or angled surfaces of the microstructured ribs manipulate light paths differently based on viewing angle. This geometric design enables precise control over the viewing cone and privacy angle without compromising overall optical clarity.
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
Enables convenient switching between privacy and public modes by altering light transmission based on the electric field, providing enhanced user control and functionality while maintaining optical clarity and durability.
Implementation Method 1
The electronically switchable material is capable of modulation between high and low absorption states upon application of an electric field across the transparent electrodes
Data Source
AI summary
An electronically switchable privacy films suitable for use in display devices are described. The electronically switchable privacy film comprises a pair of mutually opposing transparent electrodes; an optically transparent microstructured layer disposed between the transparent electrodes, the microstructured layer comprising a plurality of microstructured ribs extending across a surface thereof such that the microstructured ribs form an alternating series of ribs and channels; and electronically switchable material disposed in the channels, the electronically switchable material being capable of modulation between high and low absorption states upon application of an electric field across the transparent electrodes.