Liquid Crystal Viewing Angle Control Panel
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Solution Overview
Problem
Display devices struggle to switch between wide and narrow viewing angles without affecting image brightness, often requiring a trade-off between visibility and confidentiality, and existing solutions compromise on contrast rather than achieving both modes effectively.
Innovation Solution
A liquid crystal device with a pair of polarizing plates and a viewing angle control panel having a liquid crystal layer with aligned molecules parallel or perpendicular to one polarizing plate's axis, allowing dynamic switching between wide and narrow viewing angles by adjusting the refractive anisotropy and thickness of the liquid crystal layer, thereby controlling contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a viewing angle control panel with liquid crystal layer is added to control viewing angle, then narrow viewing angle characteristics are achieved, but device complexity increases
Solution Approach 1:
The device is divided into functional modules: display panel, viewing angle control panel, and polarizing plates. The viewing angle control panel is positioned between the polarizing plates and the display panel, creating a segmented structure that independently controls viewing angle without affecting the display functionality
Solution Approach 2:
The viewing angle control panel acts as an intermediary component between the display panel and the observer. It modulates the light from the display panel through liquid crystal molecule alignment, controlling the viewing angle without directly modifying the display panel itself
2Object-affected harmful factors
If liquid crystal molecules are aligned parallel or perpendicular to the polarizing plate axis, then contrast is lowered for unauthorized viewing, but manufacturing precision requirements increase
Solution Approach 1:
The invention utilizes changes in the alignment state parameters of liquid crystal molecules (parallel or perpendicular orientation relative to the polarizing plate axis) to control the optical properties. By switching between these discrete alignment states, the contrast is lowered for unauthorized viewing angles while maintaining manufacturability
3Adaptability or versatility
If viewing angle control panel is positioned adjacent to polarizing plates, then wide and narrow viewing angle modes are enabled, but device thickness increases
Solution Approach 1:
The viewing angle control panel is positioned in the optical path dimension between the polarizing plates and the display panel, rather than adding it in series. This spatial arrangement allows the panel to control viewing angle by modulating light polarization without significantly increasing the overall device thickness
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 both wide and narrow viewing angle modes while maintaining image brightness, effectively preventing unauthorized viewing by significantly lowering contrast when necessary, thus ensuring user privacy without compromising image quality.
Implementation Method 1
controlling a viewing angle of the display on the display panel, wherein the alignment direction of the liquid crystal molecules of the viewing angle control panel is substantially parallel or perpendicular to a transmission axis of the one polarizing plate
Implementation Method 2
a pair of polarizing plates having a transmission axis
Data Source
AI summary
A liquid crystal device includes a pair of polarizing plates having a transmission axis; a display panel being disposed between the pair of polarizing plates and having a function of displaying an image; and a viewing angle control panel having a liquid crystal layer that is disposed at a position adjacent to one of the pair of polarizing plates between the pair of polarizing plates with liquid crystal molecules aligned in a predetermined direction and controlling a viewing angle of a display on the display panel, wherein the alignment direction of the liquid crystal molecules of the viewing angle control panel is substantially parallel or perpendicular to a transmission axis of the one polarizing plate.