Switchable Peep Preventing Device for Display Privacy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Advanced displays with large light emergence angles, such as those in TV products, can inadvertently reveal personal information or privacy due to their wide viewing angles, posing a challenge in applications like personal mobile devices where privacy is a concern.
Innovation Solution
A peep preventing device comprising a transparent substrate with first and second electrodes, an insulating body with recesses, and electrophoretic liquids containing reflective charged particles, which can switch between a peep preventing mode and a wide-viewing angle mode by altering the electric field direction, thereby controlling the light diffusion angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a display device has a large light emergence angle to provide excellent user experience in TV products, then the viewing angle is improved, but personal information or privacy is divulged in personal mobile products
Solution Approach 1:
The patent applies a switchable peep preventing film that can dynamically change its properties between two states: a first state with high light emergence angle for wide viewing (TV mode) and a second state with limited viewing angle for privacy protection (mobile mode). The film's refractive index or surface properties are modified through electrical or mechanical actuation to transition between these states, allowing the display to adapt its viewing characteristics based on the application scenario.
Solution Approach 2:
The invention changes the optical parameters of the display system by modifying the peep preventing film's properties. When voltage is applied or mechanical stress is applied, the film's refractive index, thickness, or surface curvature changes, thereby altering the light emergence angle. This parameter change enables the system to switch between wide viewing angle mode and privacy-protecting mode, resolving the contradiction between viewing angle and privacy.
2Object-affected harmful factors
If a peep preventing film is applied to limit viewing angle and prevent privacy leakage, then privacy is protected, but the user experience in terms of viewing angle is degraded
Solution Approach 1:
The switchable peep preventing film allows users to dynamically adjust the viewing angle limitation based on their needs. In mobile devices, users can activate the privacy-protecting state when concerned about eavesdropping, while switching to the wide viewing angle state during normal usage to maintain excellent user experience. This dynamic switching capability resolves the contradiction by making the viewing angle limitation optional rather than fixed.
Solution Approach 2:
The film's optical parameters are changed on demand through electrical or mechanical actuation. When the user needs privacy protection, the film's refractive index or surface properties are modified to limit the viewing angle. When the user prefers wide viewing, the parameters are adjusted to restore the large light emergence angle. This controllable parameter change allows the system to balance privacy and viewing experience based on user preferences.
3Object-affected harmful factors
If existing peep preventing devices are used to converge display angle, then privacy is protected, but the device complexity increases
Solution Approach 1:
The switchable peep preventing film serves multiple functions: it acts as both a privacy protection mechanism and a viewing angle control element, and can be integrated into various display types (TV, mobile, wearable). The single film layer performs both the peep prevention function and the viewing angle modulation function, eliminating the need for separate complex mechanical structures or multiple components, thereby reducing overall device complexity while maintaining privacy protection.
Solution Approach 2:
The invention uses a thin film structure that can be easily integrated into existing display devices without adding significant complexity. The flexible film can be conformally applied to curved or flat displays and maintains compatibility with various display technologies. This thin film approach avoids the need for bulky mechanical shutters, moving parts, or complex optical systems, thereby simplifying the overall device structure while achieving effective peep prevention.
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 device effectively limits the viewing angle to prevent information leakage while maintaining high luminance in the perpendicular viewing direction, enhancing user experience by ensuring privacy and adjusting to different usage conditions.
Implementation Method 1
electrophoretic liquids are contained in the closed spaces, respectively, and the electrophoretic liquids contain reflective charged particles adapted to adhere to the second electrodes when a first electric field is applied between the first electrodes and the second electrodes
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 1E~1F
AI summary
The present application discloses a peep preventing device, a display apparatus with the peep preventing device and a method of manufacturing the peep preventing device. The peep preventing device includes: a transparent substrate; a plurality of first electrodes on the transparent substrate; a transparent insulating body on the transparent substrate, wherein the insulating body has a plurality of recesses in one-to-one correspondence with the first electrodes, each of the plurality of recesses has an opening facing towards the transparent substrate, the first electrodes are located in the recesses, respectively, and an area of a section, taken along a plane parallel to the transparent substrate, of each of the recesses gradually reduces in a direction away from the transparent substrate; and a plurality of transparent second electrodes each of which includes a second electrode sidewall portion covering a sidewall of one of the recesses. Closed spaces are defined between the insulating body and the second electrodes and the transparent substrate, electrophoretic liquids are contained in the closed spaces, respectively, and the electrophoretic liquids contain reflective charged particles adapted to adhere to the second electrodes when a first electric field is applied between the first electrodes and the second electrodes.