Viewing Angle Control Film With Electrophoretic Privacy Switching
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Solution Overview
Problem
Existing viewing angle control films struggle to balance frontal transmittance and lateral shielding rate, and they are fixed, making it difficult to switch between privacy and share modes based on user needs, with increased power consumption and potential particle agglomeration issues.
Innovation Solution
A viewing angle control film using a bi-stability electrophoretic ink with dual particles of different charge amounts in a multi-layered structure, incorporating an active barrier and black stripe barrier to control viewing angles, allowing switching between privacy and share modes while reducing power consumption and preventing particle agglomeration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture ratio is increased to improve frontal transmittance, then the lateral shielding rate decreases
Solution Approach 1:
The patent employs electrophoretic ink that can dynamically change its particle distribution in response to applied voltage. The particles can be moved between different regions to switch between privacy mode (high lateral shielding) and share mode (high frontal transmittance), allowing the film to adapt its optical properties rather than being fixed in one state
Solution Approach 2:
The patent changes the physical state and distribution parameters of the electrophoretic particles by applying voltage. By controlling particle concentration and position through electrical fields, the film can adjust its optical transmission characteristics to achieve different viewing angle control states
2Illumination intensity
If the number of layers is increased to improve aperture ratio, then alignment tolerance increases
Solution Approach 1:
The patent divides the viewing angle control function into separate structural components: the electrophoretic ink layer for dynamic control, the viewing angle patterns for geometric control, and the barrier layers for light blocking. This segmentation allows each component to be optimized independently, reducing the cumulative alignment tolerance requirements
3Device complexity
If a fixed-type viewing angle control film is used, then the structure is simple, but it cannot switch between privacy mode and share mode
Solution Approach 1:
The patent introduces dynamic controllability through the electrophoretic ink system. The film transitions from a static, fixed-type structure to a dynamic system where the optical properties can be changed in real-time through voltage application, enabling switching between privacy and share modes while maintaining relatively simple overall structure
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 film achieves both high frontal transmittance and lateral shielding rate, enabling seamless mode switching and reducing power consumption, thus enhancing user flexibility and operational reliability.
Implementation Method 1
A viewing angle control film using a bi-stability electrophoretic ink with dual particles of different charge amounts in a multi-layered structure
Implementation Method 2
The existing fixed barrier film blocks light incident on a side surface by stacking black stripe barrier patterns in a multi-layer
Data Source
AI summary
A viewing angle control film may include a lower electrode, a plurality of viewing angle patterns disposed over the lower electrode, an ink layer disposed in a space between the plurality of viewing angle patterns, an upper electrode disposed over the viewing angle pattern and the ink layer, and a plurality of barriers disposed over the upper electrode, in which the ink layer may include a first particle and a second particle having different particle charge amounts. A display device including a viewing angle control film is also disclosed.