Variable Lens Array for Rapid Stereoscopic Display Switching
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Solution Overview
Problem
Existing variable lens arrays for display apparatuses require a long time to switch between stereoscopic and regular image display modes due to the slow response speed of the liquid crystal layer, which is thicker than typical liquid crystal display panels.
Innovation Solution
A variable lens array incorporating a variable phase difference layer and an optically anisotropic layer, where the optically anisotropic layer contains liquid crystalline compound molecules fixed in an orientation state with periodically changing directions, allowing for rapid polarization direction switching, and a twisted nematic liquid crystal layer for controlling the polarization direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a liquid crystal layer is used to change the refracting power of lens columns for switching between stereoscopic and regular image display modes, then the display mode can be switched, but the response speed is slow and the switching period is long
Solution Approach 1:
The patent changes the operating parameter from refractive index modulation (conventional liquid crystal lenses) to polarization direction control. By using a liquid crystal layer with in-plane switching (IPS) mode to rotate polarization direction rather than changing focal length directly, the system achieves faster response while maintaining display mode switching capability between stereoscopic and regular images
Solution Approach 2:
The patent introduces a polarizing plate as an intermediary component between the liquid crystal layer and the lens array. The liquid crystal layer controls the polarization direction of light, and the polarizing plate converts this polarization control into effective light transmission control for the lens array, enabling fast mode switching without requiring thick liquid crystal layers
2Strength
If the liquid crystal layer is made much thicker to achieve the desired optical effect, then the refracting power can be adequately controlled, but the response speed becomes slower
Solution Approach 1:
The patent replaces the conventional mechanism of using thick liquid crystal layers for refractive index control with an optical mechanism based on polarization rotation. The thin liquid crystal layer (5μm) rotates the polarization direction of light, and the polarizing plate converts this into effective light control, substituting a slow mechanical/thick-layer approach with a faster optical polarization-based approach
Solution Approach 2:
The patent changes the critical parameter from liquid crystal layer thickness to polarization rotation angle. Instead of increasing thickness to 50μm or more for adequate optical effect, the system uses a thin layer with optimized IPS mode to achieve sufficient polarization rotation (typically 90 degrees), dramatically reducing switching time while maintaining optical effectiveness
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 rapid switching between stereoscopic and regular image display modes by quickly changing the polarization direction of light, reducing the time required for mode switching.
Implementation Method 1
a liquid crystal layer is disposed between a pair of transparent substrates each having a transparent electrode... the refracting power of the lens column can be changed by changing the voltage between the pair of substrates
Implementation Method 2
each lens column is formed of a gradient index lens made of a liquid crystal material... the refracting power of the lens column can be changed by changing the voltage
Implementation Method 3
an optically anisotropic layer that receives the light having exited out of the variable phase difference layer and works as a lens array for one of the light polarized in the first direction and the light polarized in the second direction whereas working as a transparent layer for the other light
Data Source
AI summary
A display apparatus includes: a display unit that displays a two-dimensional image; and a variable lens array disposed to face the display unit, wherein the variable lens array includes a variable phase difference layer that receives incident linearly polarized light polarized in a first direction and allows the linearly polarized light polarized in the same direction to exit or allows linearly polarized light polarized in a second direction switched from the first direction and different therefrom to exit, and an optically anisotropic layer that receives the light having exited out of the variable phase difference layer and works as a lens array for one of the light polarized in the first direction and the light polarized in the second direction whereas working as a transparent layer for the other light.