Vehicle Display Polarization Control for Driver Privacy Viewing
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Solution Overview
Problem
Existing display devices, particularly those in vehicles, struggle to effectively control the viewing angle to ensure that display images are not visible from the driver's seat while driving, while still being visible from the passenger seat.
Innovation Solution
The display device incorporates a configuration with a display panel, a first viewing angle control panel with a twisted nematic liquid crystal layer, a second viewing angle control panel with another twisted nematic liquid crystal layer, and a polarization axis rotation element. The alignment states of the liquid crystal layers in the control panels differ, and the polarization axis rotation element is positioned between the control panels and the display panel to manage the polarization components and control the viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single viewing angle control panel is used, then the device complexity is reduced, but the precision of viewing angle control is insufficient to prevent driver visibility while maintaining passenger visibility
Solution Approach 1:
The viewing angle control function is divided into two separate control panels with different liquid crystal alignment states. The first control panel has liquid crystal molecules aligned in a first direction, while the second control panel has liquid crystal molecules aligned in a second direction different from the first direction. This segmentation allows independent optimization of viewing angle characteristics for different observation positions (driver side vs. passenger side), achieving precise directional control without requiring a single complex panel design.
2Ease of manufacture
If the liquid crystal layers have the same alignment state, then the manufacturing process is simplified, but the ability to differentiate viewing angles for driver and passenger seats is lost
Solution Approach 1:
Different regions of the display device are assigned different liquid crystal alignment characteristics. The first control panel uses liquid crystal molecules aligned in a first direction optimized for passenger seat observation, while the second control panel uses liquid crystal molecules aligned in a second direction optimized for blocking driver seat observation. This local differentiation of alignment quality enables the system to adapt to different viewing requirements at different locations while maintaining standardized manufacturing processes for each panel type.
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
This configuration allows for precise control of the viewing angle, ensuring that the display image is not visible from the driver's seat while maintaining visibility from the passenger seat, thereby enhancing safety and usability in vehicle applications.
Implementation Method 1
a first viewing angle control panel including a first liquid crystal layer in which liquid crystal molecules are twisted, a second viewing angle control panel including a second liquid crystal layer in which liquid crystal molecules are twisted
Implementation Method 2
a display panel configured to modulate a first polarization component, a second polarization component
Implementation Method 3
a polarization axis rotation element provided between the first viewing angle control panel and the display panel... The polarization axis rotation element is configured to rotate the second polarization axis
Data Source
AI summary
According to one embodiment, a display device includes a display panel configured to modulate a first polarization component, a first viewing angle control panel including a first liquid crystal layer containing twisted liquid crystal molecules, a second viewing angle control panel including a second liquid crystal layer containing twisted liquid crystal molecules, and a polarization axis rotation element provided between the first viewing angle control panel and the display panel. A second polarization axis of a second polarization component which passed through the first viewing angle control panel is different from a first polarization axis of the first polarization component. The polarization axis rotation element is configured to rotate the second polarization axis.