Guest-Host Display Device Viewing Angle Switching
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Solution Overview
Problem
Current display devices lack a convenient and efficient method for switching between wide and narrow viewing angles without increasing complexity, thickness, or cost, and existing solutions either require additional components or compromise on aperture ratio and brightness.
Innovation Solution
A display device with a guest-host effect box comprising a display dielectric layer of positive liquid crystal molecules and dichroic dye molecules, where the alignment of electrodes and alignment film layers allows for switching between viewing angles by applying a bias voltage, forming alternating light-transmitting and non-light-transmitting regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dual light source backlight system is provided to adjust viewing angle, then the viewing angle switching function is improved, but the thickness and cost of the display device increase
Solution Approach 1:
The patent combines the viewing angle control function with the existing liquid crystal display structure by using a second liquid crystal layer with different alignment characteristics. This merging approach allows the display device to achieve viewing angle switching without adding separate dual light source backlight systems, thereby reducing thickness while maintaining the switching function.
Solution Approach 2:
The patent makes the liquid crystal display panel perform multiple functions: it simultaneously provides display functionality and viewing angle control through the interaction between the first and second liquid crystal layers. The second liquid crystal layer acts as both a display element and a viewing angle regulator, eliminating the need for dedicated additional components for viewing angle adjustment.
2Adaptability or versatility
If two types of drive electrodes are divided on the panel, then the viewing angle switching capability is improved, but the aperture ratio and panel brightness decrease, and process complexity increases
Solution Approach 1:
The patent applies different alignment characteristics to different regions of the liquid crystal molecules in the second liquid crystal layer. By controlling the local orientation of molecules through specific alignment layers and electric field configurations, the device achieves viewing angle control without requiring additional drive electrodes, thereby maintaining high aperture ratio and brightness.
Solution Approach 2:
The patent uses dynamic control of liquid crystal molecule orientation through applied voltages to the common electrode and signal electrodes. The liquid crystal layers can dynamically switch between different alignment states (horizontal and vertical) to control viewing angle, replacing the need for static additional drive electrodes and maintaining high light transmission.
3Object-affected harmful factors
If an anti-peeping film is attached to the display screen, then the narrow viewing angle mode is improved for confidential matters, but the device complexity and user convenience worsen due to additional preparation requirements
Solution Approach 1:
The patent enables the display device to automatically switch between narrow and wide viewing angle modes through electronic control of the liquid crystal layers. The device self-regulates its viewing angle characteristics based on control signals, eliminating the need for users to manually attach or configure physical anti-peeping films, thereby improving convenience while maintaining security functionality.
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 convenient switching between wide and narrow viewing angles with reduced complexity and brightness loss, maintaining a thin and lightweight design while avoiding the need for additional components.
Implementation Method 1
a display dielectric layer between the first substrate and the second substrate, where the display dielectric layer includes a plurality of positive liquid crystal molecules and a plurality of dichroic dye molecules
Implementation Method 2
the alignment of electrodes and alignment film layers allows for switching between viewing angles by applying a bias voltage
Implementation Method 3
the display dielectric layer includes a plurality of positive liquid crystal molecules and a plurality of dichroic dye molecules
Implementation Method 4
forming alternating light-transmitting and non-light-transmitting regions
Data Source
AI summary
A display device with viewing angle switching, and its display method and fabrication method are provided. The display device includes a display module and a guest-host effect box. The guest-host effect box includes a first substrate, a second substrate, and a display dielectric layer. A first transparent electrode is disposed on a surface of the first substrate and a second transparent electrode is disposed on a surface of the second substrate. A first alignment film layer is disposed on a surface of the first transparent electrode, and a second alignment film layer is disposed on a surface of the second transparent electrode. When a bias voltage is not applied to the first and second transparent electrodes, a display mode is a narrow viewing angle mode; and when the bias voltage is applied to the first and second transparent electrodes, the display mode is a wide viewing angle mode.