Viewing Angle Switchable Display with Liquid Crystal and Polymer Scattering
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Solution Overview
Problem
Conventional display apparatuses with wide viewing angles can inadvertently expose confidential information to others, necessitating the use of light control films that require manual adjustment, which is inconvenient.
Innovation Solution
A viewing angle switchable display apparatus featuring an electrically controlled viewing angle switching device and light scattering switching device, allowing for electronic switching between anti-peep and share modes by manipulating liquid crystal layers and polymer materials to control light transmission and scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light control film is placed in front of the display apparatus to filter wide-angle light, then anti-peep effect is improved, but ease of operation deteriorates due to manual placement and removal required
Solution Approach 1:
The patent replaces the manual mechanical operation of placing and removing light control films with an electrically controlled liquid crystal switching system. The liquid crystal layer changes its optical properties electronically through voltage control, automatically switching between wide viewing angle mode and anti-peep mode without requiring physical intervention from users.
Solution Approach 2:
The patent implements a dynamic switching system where the light control film's optical properties can be changed in real-time based on operational requirements. The liquid crystal layer transitions between different molecular orientations (parallel or perpendicular to the polarizer transmission axis) to dynamically adjust the viewing angle characteristics of the display apparatus.
2Loss of information
If a light control film is used to achieve anti-peep effect, then information security is improved, but device complexity increases due to additional components and manual operation
Solution Approach 1:
The patent integrates the light control film functionality directly into the display apparatus structure, making the display device itself capable of switching between wide viewing angle and anti-peep modes. This multi-functional integration eliminates the need for separate manual light control films and their associated handling mechanisms, thereby reducing overall device complexity while maintaining information security.
3Ease of operation
If wide viewing angle display effect is provided, then ease of operation is improved for multiple viewers, but information security deteriorates as confidential information can be peeped
Solution Approach 1:
The patent implements a dynamic switching system where the light control film's optical properties can be changed in real-time based on operational requirements. The liquid crystal layer transitions between different molecular orientations (parallel or perpendicular to the polarizer transmission axis) to dynamically adjust the viewing angle characteristics of the display apparatus.
Solution Approach 2:
The patent changes the optical parameters of the light control film by adjusting the orientation of liquid crystal molecules through electric field control. By changing the molecular orientation from parallel to perpendicular (or vice versa) relative to the polarizer transmission axis, the system switches between wide viewing angle mode and anti-peep mode, effectively controlling information leakage while maintaining viewing convenience.
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
Enables secure switching between narrow and wide viewing angles without manual intervention, effectively preventing information exposure in anti-peep mode while allowing image sharing in share mode, enhancing user convenience and security.
Implementation Method 1
The liquid crystal layer includes a plurality of liquid crystal molecules, and optical axes of the liquid crystal molecules are parallel or perpendicular to a transmission axis of the first polarizer
Implementation Method 2
electrically controlled viewing angle switching device... can be switched between an anti-peep mode and a share mode
Implementation Method 3
the electrically controlled light scattering switching device can be switched between a transparent state and a scattering state. When the electrically controlled light scattering switching device is switched to the scattering state, such that the light beams, when passing through the electrically controlled light scattering switching device, are scattered
Implementation Method 4
a first polarizer located on a side of the electrically controlled viewing angle switching device which is far away from the display panel... transmission axis of the first polarizer
Data Source
AI summary
A viewing angle switchable display apparatus including a display panel, an electrically controlled viewing angle switching device, an electrically controlled light scattering switching device, and a backlight module is provided. The electrically controlled viewing angle switching device includes two first transparent substrates, two first transparent conductive layers, a liquid crystal layer, and a first polarizer located on a side of the electrically controlled viewing angle switching device which is far away from the display panel. The liquid crystal layer includes liquid crystal molecules, and optical axes of the liquid crystal molecules are parallel or perpendicular to a transmission axis of the first polarizer. The electrically controlled light scattering switching device is located between the display panel and the backlight module and includes two second transparent substrates, two second transparent conductive layers, and an electronically controlled polymer material layer.