Liquid Crystal Lens Slit Electrode Refractive Index Matching
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Solution Overview
Problem
Current liquid crystal (LC) lenses in stereo display devices often suffer from uneven electric field distribution, leading to asymmetric tilting of LC molecules and a mismatch between the effective and ideal refractive index profiles, which deteriorates the light-concentrating property and affects the 3D displaying effect.
Innovation Solution
The introduction of slit electrodes with varying voltages and widths on a common electrode, etched separately, helps to adjust the tilting of LC molecules, improving the matching between the practical and ideal refractive index profiles, thereby enhancing the light-concentrating property and 3D display effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional LC lens with uniform electrode structure is used, then the device structure is simple and easy to manufacture, but the electric field distribution is uneven causing asymmetric LC molecule tilting and mismatch between practical and ideal refractive index profiles
Solution Approach 1:
The common electrode is segmented into multiple slit electrodes with different widths and positions. Each slit electrode independently controls the electric field in its corresponding region, enabling precise adjustment of LC molecule tilting angles to match the ideal refractive index profile while maintaining manufacturing feasibility through standardized electrode strip fabrication processes
Solution Approach 2:
Different regions of the electrode structure are assigned different properties: slit electrodes have varying widths and voltages tailored to local requirements. This local differentiation compensates for electric field non-uniformity and achieves the ideal refractive index profile distribution without requiring complete structural redesign
2Reliability
If voltage is applied to the LC lens to create refraction index differences for 3D display, then binocular parallax image is achieved, but asymmetric LC molecule tilting occurs due to uneven electric field distribution deteriorating the light-concentrating property
Solution Approach 1:
The patent varies multiple parameters of the slit electrodes including width, position, and applied voltage to optimize LC molecule tilting. By adjusting these parameters, the electric field distribution is refined to achieve symmetric tilting and improve light-concentrating property while maintaining reliable 3D display function
Solution Approach 2:
The slit electrode structure provides a mechanism for feedback optimization: by measuring the actual refractive index profile and light-concentrating performance, the voltage and geometry parameters of slit electrodes can be adjusted to reduce asymmetric tilting and improve the matching between practical and ideal profiles
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 enables improved 2D/3D display switching and enhances the 3D display effect by adjusting the LC molecule tilting to better align with the ideal refractive index profile, resulting in a more effective light-concentrating property for improved stereo perception.
Implementation Method 1
by way of refraction therethrough, light is emitted from different pixels in different polarizing directions so as to separate the parallax image
Implementation Method 2
differences in refraction index occur between the centers and the edges of the LC layers corresponding to the strip electrode sets 110 and 120 due to the electric field distribution
Implementation Method 3
LC molecules 110a and 120a corresponding to adjacent two strips of electrode sets 110 and 120 tilt in the same way
Data Source
AI summary
An LC lens is provided, which includes a first substrate, a second substrate, and a liquid crystal layer interposed between the first substrate and the second substrate. A plurality of strips of electrode sets are disposed on the second substrate, and separately distributed along a first direction parallel to the second substrate. A common electrode is disposed on the first substrate and opposite to the plurality of strips of electrode sets. At least one slit electrode is disposed in an area of the common electrode aligned with one of the strips of electrode sets, and separate from the common electrode. A corresponding stereo display device is also provided. The light-concentrating property for displaying can be enhanced accordingly and the 3D displaying effect of the stereo display device for watching can be improved.