Privacy Film Viewing Angle Control via Voltage-Scattered Capsules
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices often have wide viewing angles, which can be undesirable in certain applications, such as ATMs and vehicle navigation, where privacy and driver safety are concerns, leading to a need for a solution that can reduce the viewing angle while maintaining luminous efficiency.
Innovation Solution
A privacy film with a reduced thickness, featuring a light transmission layer with capsules and light blocking patterns, which can switch between transparent and opaque states based on applied voltage, is integrated into display devices to control the viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wide viewing angle is provided in display devices, then users can view images from various angles, but privacy is compromised and driver concentration is degraded
Solution Approach 1:
The privacy film incorporates a liquid crystal layer that can dynamically change its optical properties based on applied voltage. When voltage is applied, the liquid crystal molecules align to allow light transmission (transparent state); when voltage is removed, they return to a scattered state (opaque state). This dynamic switching capability enables the display to adapt between wide viewing angle mode and privacy protection mode, resolving the contradiction between viewing flexibility and privacy preservation.
Solution Approach 2:
The invention changes the optical parameters of the display by integrating a privacy film with voltage-controlled liquid crystal properties. By adjusting the voltage parameter, the film transitions between transparent and opaque states, thereby controlling the viewing angle parameter. This allows the system to maintain wide viewing angles when needed while restricting viewing angles to protect privacy when required, effectively managing the trade-off between adaptability and harmful effects.
2Object-affected harmful factors
If a privacy film is added to reduce viewing angle, then privacy and driver safety are improved, but device complexity increases
Solution Approach 1:
The privacy film integrates multiple functional layers into a single composite structure: a first substrate, first electrode, light blocking patterns, light transmission layer with capsules, second electrode, and second substrate. By merging these components into one integrated film that can be disposed between the display panel and backlight unit, the invention reduces the overall structural complexity compared to adding separate privacy protection mechanisms to an existing display system.
Solution Approach 2:
The privacy film serves multiple functions simultaneously: it controls viewing angles for privacy protection, manages light transmission, and can be integrated into various display devices (ATMs, vehicle navigation, mobile devices). This multi-functionality reduces the need for additional separate components, thereby minimizing the increase in device complexity while achieving privacy protection and driver safety goals.
3Adaptability or versatility
If multiple layers are stacked to achieve privacy function, then viewing angle control is improved, but thickness and manufacturing complexity increase
Solution Approach 1:
The privacy film is segmented into distinct functional layers: light blocking patterns for viewing angle control, liquid crystal capsules for dynamic switching, and electrode structures for actuation. By segmenting these functions into separate but integrated components within a single film, the invention achieves effective viewing angle control while maintaining a relatively thin overall structure, avoiding the need for stacking multiple thick separate films.
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 privacy film effectively reduces the viewing angle and enhances luminous efficiency by scattering light when not in use, ensuring privacy and improving safety, while allowing clear viewing when needed.
Implementation Method 1
A privacy film with a reduced thickness, featuring a light transmission layer with capsules and light blocking patterns, which can switch between transparent and opaque states based on applied voltage, is integrated into display devices to control the viewing angle.
Data Source
AI summary
The present disclosure relates to a privacy film and a display device including the privacy film, and more specifically, to a privacy film capable of reducing a viewing angle by including a first substrate, a first electrode disposed on the first substrate, a plurality of light blocking patterns disposed on the first electrode, a light transmission layer disposed on the first electrode and the plurality of light blocking patterns and including a plurality of capsules, a second electrode disposed on the light transmission layer, and a second substrate disposed on the second electrode, and a display device including the privacy film.