Double-Sided Display Anti-Peeping via Phase Switching
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Solution Overview
Problem
Current display technologies lack a specific method and device to address the anti-peeping issue in double-sided displays, where unauthorized users can view images from both sides.
Innovation Solution
A double-sided display device with a conversion layer that switches between light-transmitting and opaque states, combined with display layers that output interfering signals during an interfering phase, ensuring an unauthorized user cannot obtain a valid picture by mixing interfering light with the displayed images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a double-sided display is used to enable viewing from both sides, then the versatility and information display capability are improved, but the information security and anti-peeping performance deteriorate
Solution Approach 1:
The patent implements periodic switching between display phase and interfering phase. During display phase, the conversion layer blocks light to show images on both sides. During interfering phase, the conversion layer transmits light while interfering signals are displayed to prevent peeping. This periodic alternation resolves the contradiction by enabling versatile double-sided display while periodically preventing unauthorized viewing.
Solution Approach 2:
The patent converts the harmful effect of light transmission (which enables peeping) into a beneficial anti-peeping mechanism. During interfering phase, light transmission is enabled but interfering signals are superimposed, transforming the potential security vulnerability into an active protection mechanism that prevents unauthorized viewing while maintaining display functionality.
2Object-affected harmful factors
If interfering signals are displayed during interfering phase to prevent peeping, then the anti-peeping performance is improved, but the image quality and display clarity may deteriorate
Solution Approach 1:
The patent segments the display time into distinct phases: display phase for high-quality image presentation and interfering phase for anti-peeping protection. This temporal segmentation ensures that interfering signals only appear when the conversion layer transmits light, preventing degradation of image quality during normal display operations while maintaining strong anti-peeping performance when needed.
Solution Approach 2:
Through periodic switching between display and interfering phases, the system ensures that interfering signals are only active during brief intervals when the conversion layer transmits light. This periodic action minimizes the impact on overall image quality while maintaining effective peeping prevention, as the interfering signals are not continuously present during normal viewing.
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 solution effectively prevents unauthorized viewing by ensuring only authorized users with a watching auxiliary device, such as shutter glasses, can see the intended images during the display phase, while the interfering phase prevents valid picture acquisition by others.
Implementation Method 1
a conversion layer positioned between the first display layer and the second display layer, which switches between a light-transmitting state and an opaque light-shielding state
Implementation Method 2
the conversion layer comprises a liquid crystal layer, and one or more driving electrodes which are configured to drive the liquid crystal layer; when the one or more driving electrodes are loaded with a driving voltage, the conversion layer is opaque and in the light-shielding state, when the one or more driving electrodes are not loaded with the driving voltage, the conversion layer is light-transmitting and in the light-transmitting state
Implementation Method 3
the conversion layer comprises: an upper polarizer and a lower polarizer whose polarization direction is perpendicular to each other
Data Source
AI summary
A double-sided display device includes: a first display layer, configured to implement output of a display signal of a first side; and a second display layer, configured to implement output of a display signal of a second side; a conversion layer positioned between the first display layer and the second display layer, which switches between a light-transmitting state and an opaque light-shielding state. The conversion layer is in the light-shielding state during a display phase, and in the light-transmitting state during an interfering phase which follows the display phase. During the interfering phase, the first display layer is further configured to output a first interfering signal to interfere with the image displayed by the second side, and the second display layer is further configured to output a second interfering signal to interfere with the image displayed by the first side.