Liquid Crystal Privacy Screen Electrode Layout for Low-Light Anti-Peeping
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Solution Overview
Problem
Existing electrically controlled viewing angle switching devices suffer from inadequate anti-peeping performance under low ambient light brightness and display effect interference due to checkerboard-like arrangements at non-anti-peeping viewing angles.
Innovation Solution
An electrically controlled anti-peeping device with a first and second substrate, a liquid crystal layer, and multiple electrode layers, including a third electrode layer, configured to generate different phase retardations in bright and dark areas, and adjustable voltages to enhance anti-peeping performance and user visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light control film is manually placed in front of the display panel to achieve anti-peeping effect, then privacy protection is improved, but operational convenience deteriorates
Solution Approach 1:
The patent replaces the manual mechanical placement of light control film with an electrically controlled liquid crystal viewing angle switching device. The liquid crystal layer, controlled by electrode layers, automatically adjusts the viewing angle range through electrical signals, eliminating the need for manual film placement while maintaining privacy protection functionality.
Solution Approach 2:
The patent implements dynamic control of the viewing angle through electrical signals. The liquid crystal layer can dynamically adjust its optical properties based on applied voltage, allowing the viewing angle range to be changed from fixed to variable, thereby improving both privacy protection and operational convenience.
2Object-affected harmful factors
If an electrically controlled viewing angle switching device with patterned driving electrodes is used to display brightness distribution pattern for anti-peeping, then anti-peeping performance is improved, but display effect deteriorates due to visible checkerboard-like arrangement
Solution Approach 1:
The patent applies different properties to different regions of the liquid crystal layer. By controlling the liquid crystal molecules in different areas with different orientations and phase retardations, the device creates localized optical characteristics that achieve anti-peeping effect in specific viewing directions while maintaining uniform display quality in the normal viewing area.
Solution Approach 2:
The patent changes the optical parameters of the liquid crystal layer by adjusting the phase retardation values in different regions. By varying the phase retardation parameters locally, the device can control light transmission differently in various areas, achieving both anti-peeping performance and display quality without the visible checkerboard pattern.
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 provides improved anti-peeping performance and reduced display effect interference by forming nearly all-black brightness distributions at anti-peeping viewing angles, enhancing user experience and preventing information leakage.
Implementation Method 1
the electrically controlled viewing angle switching device uses the electrically controllable optical properties of the liquid crystal layer to adjust the light emission angle range
Implementation Method 2
the first electrode layer and the third electrode layer are disposed on the first substrate... configured to generate different phase retardations in bright and dark areas
Data Source
AI summary
An electrically controlled anti-peeping device including a first substrate, a second substrate, a liquid crystal layer, a first electrode layer, a second electrode layer, a third electrode layer, a first polarizer, and a second polarizer is provided. The first substrate and the second substrate are arranged overlapping each other. The liquid crystal layer is disposed between the first substrate and the second substrate. The first electrode layer and the third electrode layer are disposed on the first substrate. The second electrode layer is disposed on the second substrate. The third electrode layer is located between the first electrode layer and the first substrate, and a projection region of the first electrode layer on the first substrate at least partially overlaps a projection region of the third electrode layer on the first substrate. The first polarizer and the second polarizer are arranged on the first substrate and the second substrate, respectively.