Switchable Birefringent Stack for 2D-3D Display Mode Transition
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Solution Overview
Problem
Existing multi-view displays, particularly those using lenticular arrangements, face challenges in efficiently switching between 2D and 3D modes with unpolarized light sources like OLED displays, leading to light loss and reduced power efficiency due to the need for polarized light input.
Innovation Solution
A switchable lenticular lens arrangement using a stack of birefringent materials with adjustable optic axes, allowing for manipulation of light beams between on and off states, enabling seamless transition between 2D and 3D modes without requiring polarized light input, and utilizing a single switchable layer for thin construction and reduced path differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a lenticular arrangement with polarized light input is used to achieve multi-view display, then 3D imaging capability is improved, but light loss increases and power efficiency decreases
Solution Approach 1:
The patent changes the polarization state parameter of light through switchable birefringent material layers. By controlling the optic axis orientation of the birefringent material, the system can switch between transmitting polarized light (for 3D mode) and unpolarized light (for 2D mode), thereby reducing light loss while maintaining multi-view display capability
Solution Approach 2:
The patent uses a composite structure consisting of multiple layers including solid birefringent material layers, switchable birefringent material, and interfaces with lens or prism shapes. This composite arrangement enables efficient manipulation of light paths for both 2D and 3D modes without significant light loss
2Adaptability or versatility
If multiple switchable layers are used in the lenticular arrangement, then light manipulation capability is improved, but device thickness increases and fabrication complexity rises
Solution Approach 1:
The patent divides the optical system into distinct functional layers: solid birefringent material layers with fixed optic axes, switchable birefringent material layers with controllable optic axes, and interface layers with lens structures. This segmentation allows independent optimization of each layer while simplifying the overall fabrication process
Solution Approach 2:
The switchable birefringent material layer serves multiple functions: it can rotate its optic axis to control polarization state, it works in conjunction with the solid birefringent material layers to manipulate light paths, and it enables switching between 2D and 3D modes. This multi-functionality reduces the need for separate components
3Adaptability or versatility
If traditional lenticular arrangements are used with unpolarized light sources, then compatibility with OLED displays is improved, but light output efficiency decreases
Solution Approach 1:
The patent dynamically changes the polarization parameter of light passing through the system by controlling the optic axis orientation of the switchable birefringent material. When viewing 3D content, the system rotates the optic axis to create the necessary polarization effects, maximizing light output efficiency while maintaining compatibility with unpolarized OLED light sources
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 efficient switching between 2D and 3D modes with unpolarized light, maintaining light output and power efficiency, and allowing multiple views for enhanced 3D imaging or dual-view configurations for different viewers, while reducing cross-talk and fabrication complexity.
Implementation Method 1
a birefringent material, the optic axis of which can be rotated by the application of a voltage
Implementation Method 2
the optic axis of which can be rotated by the application of a voltage
Implementation Method 3
a stack of layers comprising a first solid material layer, a second solid material layer, and switchable birefringent material
Data Source
AI summary
The invention provides an autostereoscopic display device having an adjuster for adjusting the direction of a light beam (5). The adjuster (1) has an off-state and on-state and comprises a stack (10) of layers. The stack (10) comprises a first solid material layer (100) having a first optic axis (111), a second solid material layer (200) having a second optic axis (211), and switchable birefringent twisted nematic liquid crystal material (30) or chiral nematic liquid crystal material. Further, the stack includes a first interface (130) between the first solid material layer (100) and birefringent material (30) and a second interface (230) between the second solid material layer (200) and birefringent material (30). In the off-state, the birefringent material (30) at the first interface (130) is configured to have an optic axis parallel to the first optic axis (111) and the birefringent material (30) at the second interface (230) is configured to have an optic axis parallel to the second optic axis (211). In the on-state, the birefringent material (30) at the first interface (130) is configured to have an optic axis perpendicular to the first optic axis (111) and the birefringent material (30) at the second interface (230) is configured to have an optic axis perpendicular to the second optic axis (211).