Cholesteric Liquid Crystal Holographic Display with Phase Plates
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Solution Overview
Problem
Conventional automatic holographic display devices using a parallax barrier method suffer from reduced optical transmittance and luminance due to a low aperture ratio in the barrier panel, complicating manufacturing and increasing costs.
Innovation Solution
An automatic holographic display device incorporating a modulated cholesteric liquid crystal panel and phase difference plates, where the cholesteric liquid crystal panel is directly driven by electrodes to form alternately arranged barrier and slit regions, and phase difference plates facilitate conversion between 2D and 3D images, improving transmittance and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional barrier panel with low aperture ratio is used to display 3D holographic images, then the 3D image can be displayed with parallax barrier method, but the optical transmittance and luminance are significantly reduced
Solution Approach 1:
The patent applies parameter changes by transitioning from conventional liquid crystal to cholesteric liquid crystal, which fundamentally alters the optical properties of the barrier panel. The cholesteric liquid crystal's selective reflection characteristics enable the barrier to maintain high aperture ratio while achieving effective left-right eye image separation, thereby improving luminance without sacrificing the 3D display function
Solution Approach 2:
The patent employs composite materials by combining cholesteric liquid crystal with specific polarizers and phase difference plates. This composite structure leverages the unique properties of each component: the cholesteric liquid crystal for selective reflection, polarizers for polarization control, and phase difference plates for enhancing the 3D effect, achieving high aperture ratio and improved luminance simultaneously
2Adaptability or versatility
If multiple layers including separate liquid crystal panel and cholesteric liquid crystal layers are adhered to enable 2D-3D conversion, then mutual conversion between 2D flat images and 3D holographic images is achieved, but the manufacturing process becomes complicated and costs increase
Solution Approach 1:
The patent merges the 2D display function and 3D holographic display function into a single integrated barrier panel using cholesteric liquid crystal. This eliminates the need for separate liquid crystal panels and multiple adhered layers, simplifying the overall structure while maintaining the ability to switch between 2D and 3D modes through electrical control of the cholesteric liquid crystal
3Reliability
If the parallax barrier accounts for large portion of the barrier panel to display natural 3D images, then the 3D holographic image can be displayed naturally, but the aperture ratio decreases and optical efficiency is largely decreased
Solution Approach 1:
The patent changes the fundamental optical parameter of the barrier material from conventional liquid crystal to cholesteric liquid crystal. This material change enables the barrier to achieve both high aperture ratio and effective image separation, maintaining optical efficiency while ensuring natural 3D display quality through the cholesteric liquid crystal's inherent selective reflection properties
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
Simplifies manufacturing, reduces costs, and enhances optical transmittance and luminance by enabling efficient conversion between 2D and 3D images using a parallax barrier method, while allowing for adjustable polarization and improved light reuse.
Implementation Method 1
a second liquid crystal panel, which comprises a cholesteric liquid crystal panel
Implementation Method 2
liquid crystal in the modulated cholesteric liquid crystal panel is directly driven by an electrode
Implementation Method 3
a first phase difference plate disposed above the cholesteric liquid crystal panel and a second phase difference plate disposed below the cholesteric liquid crystal panel
Implementation Method 4
A parallax barrier allows a display device to show three-dimensional images such that vertical or horizontal slits are formed in front of images corresponding to the left and right eyes
Data Source
AI summary
Provided is an automatic holographic display device including: a first liquid crystal panel, a second liquid crystal panel disposed below the first liquid crystal panel, and a backlight that is disposed below the second liquid crystal panel and emits light, wherein the second liquid crystal panel comprises a cholesteric liquid crystal panel in which a barrier region and a slit region are alternately arranged according to an applied electric field, a first phase difference plate disposed above the cholesteric liquid crystal panel, and a second phase difference plate disposed below the cholesteric liquid crystal panel, wherein the backlight comprises a reflection plate that reflects light. The automatic holographic display device includes a modulated cholesteric liquid crystal panel and a phase difference plate, and thus mutual conversion between 2D flat images and 3D holographic images can be easy, the process of manufacturing the device can be simplified, and the manufacturing costs can be decreased. In addition, an automatic holographic display device in which optical transmittance can be improved by the modulated cholesteric liquid crystal panel and the phase difference plates, and luminance reduction that commonly occurs using a parallax barrier method can be prevented is provided.