3D Display Polarizing Plate Segmented Shading for Moiré Reduction
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Solution Overview
Problem
3D image display devices experience moiré interference due to the close pitches of image generating area shading parts and polarizing-axis control plate area shading parts, leading to reduced image clarity and stereoscopic effect.
Innovation Solution
The 3D image display device incorporates a polarizing-axis control plate with multi-segmentalized linear patterns for the polarizing-axis control plate area shading parts, which reduces the occurrence of moiré by altering the linear pattern profiles and improving light transmission rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the pitches of image generating area shading parts and polarizing-axis control plate area shading parts are made close to each other, then light transmission is improved, but moire interference is generated
Solution Approach 1:
The linear pattern of the polarizing-axis control plate area shading parts is divided into multiple segments (multi-segmentalized) along the horizontal direction. This segmentation breaks the continuous linear pattern into discrete segments, which prevents the formation of moire interference patterns while maintaining adequate light transmission. The segmented structure allows light to pass through the gaps between segments without creating the repetitive interference patterns that cause moire.
Solution Approach 2:
The invention introduces asymmetry by making the linear pattern multi-segmentalized rather than uniform and continuous. The segments are positioned at specific intervals that break the symmetry and regularity that would otherwise contribute to moire formation. This asymmetric segmentation disrupts the periodic interference patterns while preserving the shading function.
2Device complexity
If the pitches of image generating area shading parts and polarizing-axis control plate area shading parts are made close to each other, then device structure is simplified, but moire interference occurs when observer views from positions other than front
Solution Approach 1:
The linear pattern is segmented into multiple sections horizontally, which maintains the relatively simple overall device structure while eliminating moire interference. The segmentation is achieved by introducing discontinuities in the linear pattern rather than adding complex additional components, thus keeping device complexity low while solving the moire problem.
3Use of energy by moving object
If linear pattern profiles are altered to reduce moire, then light transmission rate is improved, but device complexity increases
Solution Approach 1:
The segmentation of the linear pattern achieves both improved light transmission and maintained structural simplicity. By dividing the continuous linear pattern into segments with gaps, more light can pass through while the overall structure remains relatively simple and manufacturable. The segmentation approach balances optical performance with structural complexity.
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 minimizes moiré interference and enhances light transmission, resulting in improved image clarity and stereoscopic effect by creating an optical random nature that reduces interference between shading parts.
Implementation Method 1
a polarizing-axis control plate that emits linearly-polarized lights whose polarizing axes of polarized lights incident on two different areas intersect with each other at right angles
Implementation Method 2
image generating area shading parts provided with black matrixes as lattice-like black patterns among respective color filter areas to prevent color mixing among adjacent red, green and blue pixels and also shade light from a back light
Implementation Method 3
moire was sometimes generated in case of adopting the techniques described in Patent Documents 1 to 5. The 'moiré' is also called 'interference fringes' and means a striped pattern that is visually produced under condition of superimposing multiple repetitive regular patterns
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A polarizing-axis control plate 180 includes a first polarization area 181, a second polarization area 182 and a polarizing-axis control plate area shading part 183 arranged at a boundary between the first polarization area 181 and the second polarization area 182 and also arranged in a position corresponding to an image generating area shading part 163 to shade all or part of right-eye image light and left-eye image light. When the right-eye image light and the left-eye image light enter the first polarization area 181 and the second polarization area 182 respectively, the polarizing-axis control plate 180 emits the incident image light and the incident left-eye image light in the form of linearly-polarized lights whose polarizing axes intersect with each other at right angles or circularly-polarized lights whose polarizing axes are rotated in opposite directions. An image generating unit 160 includes the image generating area shading part 163 arranged at a boundary between a first modulated-light generating area and a second modulated-light generating area to shade incident light. The polarizing-axis control plate area shading part 183 is formed so as to contain a plurality of straight lines each having a width narrower than a linewidth of the image generating area shading part 163.