3D Display Barrier Electrode Overlap Ratio for Moire Suppression
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Solution Overview
Problem
The parallax barrier scheme for three-dimensional image display experiences crosstalk and moire issues due to the movement of a viewpoint, which degrades image quality, and existing solutions require complex eye tracking and precise control of barrier electrodes.
Innovation Solution
A liquid crystal parallax barrier panel with a two-layer structure of first and second barrier electrodes, where the second electrodes fill gaps between the first electrodes and are overlapped, with specific pitch and width ratios to minimize crosstalk and moire, allowing for effective eye tracking and high-quality three-dimensional image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-layer structure of barrier electrodes is used to enable eye tracking and suppress crosstalk, then crosstalk is reduced, but moire occurs due to periodic low transmittance regions
Solution Approach 1:
The patent applies local quality by making the barrier electrodes asymmetric in their overlap configuration. Specifically, in one region, the first and second barrier electrodes are overlapped, while in another region, they are not overlapped. This creates different local transmittance characteristics that eliminate periodic patterns, thereby suppressing moire while maintaining crosstalk suppression capabilities through the two-layer structure
Solution Approach 2:
The patent employs asymmetry by deliberately designing the barrier electrode arrangement to be non-uniform across different regions. The asymmetric overlap configuration between first and second barrier electrodes creates irregular transmittance distribution that prevents the formation of periodic moire patterns, while still achieving the desired eye tracking functionality
2Reliability
If barrier electrodes are separated into many pieces for precise eye tracking control, then crosstalk is suppressed, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the barrier electrode system into two separate layers (first barrier electrodes and second barrier electrodes). This segmentation enables independent control of each layer, allowing for precise eye tracking and crosstalk suppression. The segmented structure can be controlled in sections, reducing the overall complexity compared to a single complex electrode system
Solution Approach 2:
The patent transitions from a single-layer to a two-layer electrode configuration, adding a vertical dimension to the electrode arrangement. This dimensional change allows for more flexible control strategies and reduces the complexity of individual electrode patterns while achieving the same or better crosstalk suppression performance
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
The solution effectively suppresses crosstalk and moire, maintaining high image quality even with viewpoint movement by optimizing the arrangement and overlap of barrier electrodes, enabling efficient eye tracking and seamless switching between two-dimensional and three-dimensional displays.
Implementation Method 1
the liquid crystal parallax barrier panel changing positions of its barriers in accordance with a change in positions of viewer's eyes, wherein the barriers include first barrier electrodes and second barrier electrodes
Data Source
AI summary
Second barrier electrodes are arranged under first barrier electrodes so as to fill gaps between the first barrier electrodes, while an insulating layer is located between the first barrier electrodes and the second barrier electrodes. The number of first barrier electrodes and the number of second barrier electrodes in each barrier pitch are 6 or more. The positions of the barriers formed by the first barrier electrodes and the second barrier electrodes are controlled by the reception of a signal representing detected positions of the eyes of a viewer. If pitches of the first barrier electrodes are defined as BE, and the widths of regions in which the first barrier electrodes are overlapped with the second barrier electrodes are defined as BA, a ratio BA/BE of the widths BA to the pitches BE are 0.3 or smaller. This configuration can suppress the occurrence of moire.