Birefringent Lens Grating for 2D and Stereoscopic Display Switching
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Solution Overview
Problem
Conventional liquid crystal displays with a polymer dispersed liquid crystal layer cannot achieve both stereoscopic and 2D display functions, limiting their application in modern display technology.
Innovation Solution
A display assembly comprising a polymer dispersed liquid crystal layer, birefringent lens gratings, and a backlight module that provides collimated light of different polarization directions, allowing the birefringent lens gratings to transmit or refract light to achieve 2D or stereoscopic views by controlling the polarization direction of incident light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional liquid crystal displays with polymer dispersed liquid crystal layer are used, then the display structure is simple and manufacturing is easy, but the display device cannot achieve both stereoscopic and 2D display functions
Solution Approach 1:
The birefringent lens grating is designed to perform multiple functions: it acts as a stereoscopic display element when receiving circularly polarized light, and as a 2D display element when receiving linearly polarized light. This single component enables the display device to achieve both stereoscopic and 2D display functions, resolving the contradiction between versatility and complexity.
Solution Approach 2:
The invention changes the polarization state parameter of the incident light to switch between display modes. By controlling whether the incident light is circularly polarized or linearly polarized, the same birefringent lens grating can produce different display effects, enabling multi-functionality without adding structural complexity.
2Adaptability or versatility
If polarizers and alignment layers are added to achieve stereoscopic display, then stereoscopic function is improved, but the display device thickness and manufacturing complexity increase
Solution Approach 1:
The invention extracts and eliminates the need for traditional polarizers and alignment layers by using a birefringent lens grating that can directly manipulate light polarization states. The liquid crystal molecules in the grating themselves perform the polarization function, removing the need for separate polarizing components and reducing overall device thickness.
Solution Approach 2:
The invention merges the functions of the liquid crystal layer and the birefringent lens grating into a single integrated structure. The liquid crystal molecules are embedded within the lens grating, combining the polarization control and light focusing functions into one component, thereby reducing the number of separate layers and 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 simultaneous 2D and stereoscopic display capabilities without the need for polarizers or liquid crystal layers, enhancing display functionality and reducing thickness and complexity.
Implementation Method 1
the birefringent lens grating is configured to transmit collimated light of a first polarization direction emitted from the polymer dispersed liquid crystal layer along an original optical path of the collimated light, and to refract collimated light of a second polarization direction emitted from the polymer dispersed liquid crystal layer to left and right eyes of an user, respectively
Implementation Method 2
the birefringent lens grating is configured to transmit collimated light of a first polarization direction emitted from the polymer dispersed liquid crystal layer along an original optical path of the collimated light, and to refract collimated light of a second polarization direction emitted from the polymer dispersed liquid crystal layer to left and right eyes of an user, respectively
Implementation Method 3
a birefringent lens grating that is closer to a display side of the display assembly than the polymer dispersed liquid crystal layer
Implementation Method 4
PDLC is a material having electro-optical response characteristics by means of dielectric anisotropy of the liquid crystal molecules
Implementation Method 5
PDLC is a material having electro-optical response characteristics by means of dielectric anisotropy of the liquid crystal molecules, and it mainly works between a scattering state and a transparent state
Data Source
AI summary
A display assembly, a display device, and a control method thereof are disclosed. The display assembly includes: a polymer dispersed liquid crystal layer; a first electrode layer and a second electrode layer for providing an electric field for the polymer dispersed liquid crystal layer; and a birefringent lens grating that is closer to a display side of the display assembly than the polymer dispersed liquid crystal layer. The birefringent lens grating is configured to transmit collimated light of a first polarization direction emitted from the polymer dispersed liquid crystal layer along an original optical path of the collimated light, and to refract collimated light of a second polarization direction emitted from the polymer dispersed liquid crystal layer to left and right eyes of an user, respectively. The first polarization direction is perpendicular to the second polarization direction.