Liquid Crystal Beam Shaping Device for Autostereoscopic Displays
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Solution Overview
Problem
Existing beam shaping devices face limitations in efficiently diverging and converging light beams, particularly in macroscopic applications requiring large beam divergence and convergence, and they often result in resolution loss in stereoscopic displays.
Innovation Solution
A beam shaping device comprising optically transparent substrates with a liquid crystal layer sandwiched between, and electrodes arranged on one side to create an electric field parallel to the liquid crystal layer, allowing for efficient refractive index gradient control and beam shaping through the reorientation of liquid crystal molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional beam shaping devices are used to achieve large beam divergence and convergence, then beam shaping capability is improved, but manufacturing complexity and inefficiency worsen
Solution Approach 1:
The patent replaces conventional mechanical beam shaping components (lenses, mirrors) with a liquid crystal optical system. The liquid crystal layer, when subjected to an electric field, changes its refractive index to diverge or converge light beams, eliminating the need for complex mechanical optical components and their associated manufacturing challenges.
Solution Approach 2:
The invention utilizes the ability of liquid crystal materials to change their optical parameters (refractive index) in response to electric field application. By controlling the voltage applied to the liquid crystal layer, the beam divergence and convergence angles can be dynamically adjusted, providing a programmable alternative to fixed mechanical optical systems.
2Adaptability or versatility
If lenticular elements are used to provide stereoscopic views, then three-dimensional display capability is improved, but horizontal resolution worsens due to necessary sacrifice
Solution Approach 1:
The patent implements a dynamic system that can switch between different operational modes. The liquid crystal beam shaping device can be electrically controlled to provide either stereoscopic views with lenticular functionality or to operate in a planar mode that preserves full horizontal resolution, allowing the display to adapt to different viewing requirements without permanent resolution loss.
Solution Approach 2:
The invention creates a multi-functional display system where the same liquid crystal optical element can serve multiple purposes: providing stereoscopic 3D views when needed, or operating as a simple planar transparent layer to maintain maximum resolution for 2D content. This universal component replaces the need for separate dedicated lenticular elements.
3Adaptability or versatility
If switchable lenticular array is used to implement 2D/3D mode switching, then display mode versatility is improved, but device complexity worsens
Solution Approach 1:
The patent combines the lenticular functionality and the switching mechanism into a single integrated liquid crystal optical element. The same liquid crystal layer that provides beam shaping for stereoscopic views also serves as the switching mechanism when electrically controlled, eliminating the need for separate mechanical switching components and reducing overall device complexity.
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 enables efficient beam divergence and convergence, achieving angles in excess of 60° and reducing light loss, while maintaining high resolution in both 2D and 3D modes, particularly suitable for autostereoscopic displays.
Implementation Method 1
The alignment orientation of liquid crystal molecules in a liquid crystal cell can be controlled by applying an electric field thereto. This reorientation of the liquid crystal molecules results in a refractive index gradient, which leads to a light ray passing through the liquid crystal cell being redirected.
Implementation Method 2
The alignment orientation of liquid crystal molecules in a liquid crystal cell can be controlled by applying an electric field thereto. This reorientation of the liquid crystal molecules results in a refractive index gradient
Data Source
AI summary
A beam shaping device (1; 31) comprising first (3; 33) and second (4; 37) optically transparent substrates, a liquid crystal layer (2; 36) sandwiched there between, and first (5; 34) and second (6; 35) electrodes arranged on a side of the liquid crystal layer (2; 36) facing the first substrate (3; 34). The beam shaping device (1; 31) is controllable between beam-shaping states, each permitting passage of light through the beam-shaping device in a direction perpendicular thereto. The beam shaping device (1; 31) is configured in such a way that application of a voltage (V) across the first (5; 34) and second (6; 35) electrodes results in an electric field having a portion essentially parallel to the liquid crystal layer (2; 36) in a segment thereof between neighboring portions of the electrodes (5, 6; 34; 35) and extending substantially from the first substrate (3; 34) to the second (4; 35) substrate. In this way a relatively high refractive index gradient can be obtained across short distances, which enables a very efficient beam shaping. The electric field can be achieved by utilizing electrodes provided on one side of the liquid crystal layer, in a so-called in-plane configuration. The device can be used in an autostereoscopic display device, for switching between 2D and 3D modes.