Switchable Liquid Crystal Display for Privacy Mode
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Solution Overview
Problem
Existing display technologies cannot easily switch between wide and narrow viewing angles without moving parts, inefficiencies in light usage, or manufacturing complexities, limiting their application in private and public modes.
Innovation Solution
A display system using a liquid crystal device with switchable liquid crystal layers that adjust their alignment to control viewing angles, allowing for a uniform non-patterned alignment surface and operation in various modes by applying different voltages, thereby modulating light propagation and providing a switchable privacy feature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light control film is used to restrict viewing angles, then privacy is improved, but light transmission efficiency deteriorates
Solution Approach 1:
The patent applies a switchable liquid crystal layer that can dynamically change its light control properties. When voltage is applied, the liquid crystal molecules reorient to allow light transmission; when voltage is removed, they return to a state that restricts viewing angles. This dynamic switching capability allows the display to transition between private and public modes, resolving the contradiction by making the light control property adjustable rather than fixed.
2Adaptability or versatility
If a switchable diffuser is placed between the light control film and display panel, then viewing angle switching is enabled, but light absorption increases and display becomes dimmer
Solution Approach 1:
The patent introduces a polarizer as an intermediary element between the light control film and the display panel. The polarizer works in conjunction with the switchable liquid crystal layer to control light transmission. By using polarized light and the liquid crystal's ability to rotate polarization, the system achieves viewing angle control without relying on a diffuser that would scatter and dim the light. This intermediary approach maintains brightness while enabling switching functionality.
3Reliability
If a mechanical moving light control film is used, then privacy mode is achieved, but device complexity and bulk increase
Solution Approach 1:
The patent replaces the mechanical moving film system with an electrically controlled liquid crystal layer. Instead of physically moving a light control film to change viewing angles, the liquid crystal molecules are reoriented using electrical voltage. This substitution of mechanical action with electrical control eliminates moving parts, reduces device complexity, and maintains the privacy functionality through electronic switching rather than mechanical movement.
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 seamless switching between wide and narrow viewing angles without moving parts, optimizing light usage and simplifying manufacturing, allowing for versatile applications in devices like monitors and mobile devices.
Implementation Method 1
a first liquid crystal device having at least one liquid crystal layer whose molecules are switchable between a first state providing a first viewing angle range and a second state providing a second viewing angle range
Implementation Method 2
allowing for a uniform non-patterned alignment surface and operation in various modes by applying different voltages, thereby modulating light propagation
Implementation Method 3
the first liquid crystal device being arranged, when the liquid crystal molecules are in the second state, to block at least partially light propagating towards part of the first viewing angle range outside the second viewing angle range
Data Source
AI summary
A display is provided for switching between a narrow or private viewing mode and a wide or public viewing mode. The display comprises a display device which is controlled to provide display of a desired image or sequence of images. This is associated with a liquid crystal device having at least one liquid crystal layer whose molecules are switchable between a first state providing a first angular viewing range and a second state providing a second angular viewing range which is within and smaller than the first angular viewing range. With the molecules in the second state, the device at least partially blocks light propagating towards part of the first angular viewing range outside the second angular viewing range. The or each liquid crystal layer is in contact with at least one alignment surface, the or each of which comprises a uniform non-patterned alignment surface.