Switchable Birefringent Lenticular Elements for Artefact-Free Multi-View Displays
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Solution Overview
Problem
Autostereoscopic display devices suffer from unwanted display artefacts when viewed at oblique angles in 2D mode, due to residual lens effects from birefringent lenticular elements, which compromise image quality and introduce complexity in design.
Innovation Solution
A switchable birefringent electro-optic material and a non-switchable optically transparent layer are used, where the birefringent material aligns light polarization to match the refractive indices in both 2D and 3D modes, eliminating artefacts by matching refractive indices in the 2D mode and enabling stereoscopic views in the 3D mode without additional complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If birefringent lenticular elements are used to provide stereoscopic views, then 3D display capability is improved, but unwanted display artefacts appear when viewed at oblique angles in 2D mode
Solution Approach 1:
The lenticular elements incorporate switchable birefringent electro-optic material that can dynamically change its optical properties. In 3D mode, the material exhibits birefringence to separate views for stereoscopic display. In 2D mode, the material's birefringence is switched off to eliminate residual lens effects that cause artefacts at oblique viewing angles, thus adaptively optimizing display quality for different modes.
Solution Approach 2:
The refractive index of the lenticular elements is made switchable through the use of electro-optic material. By changing the refractive index parameter dynamically - maintaining birefringence for 3D mode and eliminating it for 2D mode - the system resolves the contradiction between providing stereoscopic capability and avoiding display artefacts in different viewing modes.
2Object-affected harmful factors
If switchable birefringent material is used to eliminate artefacts, then image quality in 2D mode is improved, but device complexity increases
Solution Approach 1:
The patent merges the lenticular element structure with switchable birefringent electro-optic material in a single integrated component. This combination eliminates the need for separate artefact-reduction mechanisms, achieving high-quality 2D mode display without requiring additional complex subsystems. The electro-optic material is embedded within the lenticular elements themselves, streamlining the design.
Solution Approach 2:
The lenticular elements with switchable birefringent material serve multiple functions: they provide stereoscopic view separation in 3D mode and act as artefact-free optical elements in 2D mode. This multi-functionality reduces the need for separate components for different display modes, thereby reducing overall device complexity while maintaining high image quality across both modes.
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 solution provides high-quality single-view mode images free of artefacts across a wide viewing plane, maintaining image integrity at oblique angles without increasing design complexity, and can be adapted to various display panel polarizations.
Implementation Method 1
a switchable birefringent electro-optic material and a non-switchable optically transparent layer are used, where the birefringent material aligns light polarization to match the refractive indices in both 2D and 3D modes
Implementation Method 2
the birefringent material aligns light polarization to match the refractive indices in both 2D and 3D modes, eliminating artefacts by matching refractive indices in the 2D mode
Implementation Method 3
An array of elongate lenticular elements extending parallel to one another overlies the display pixel array, and the display pixels are observed through these lenticular elements. The lenticular elements provide a light output directing function.
Data Source
AI summary
A multi-view display is switchable between single view and multi-view modes, and uses lenticular means (9) arranged over the display panel which comprise birefringent electro-optic material (62) adjacent a non-switchable optically transparent layer (60). The non-switchable optically transparent layer (60) has a refractive index (n) substantially equal to the extra ordinary refractive index of the birefringent electro-optic material (62).In the single view mode, the birefringent electro-optic material (62) defines a non-switched state, and the polarization (64) of the light output from the display panel and incident on the lenticular means is linear and aligned with the optical axis of the birefringent electro-optic material (62) at the surface where the display output light is received. In the multi-view mode, the birefringent electro-optic material (62) defines a switched state in which the optical axis is aligned perpendicularly to the display output surface.