Autostereoscopic Display Sub-Pixel Slant for Banding Reduction
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Solution Overview
Problem
Autostereoscopic displays with non-slanted lenticular lenses suffer from brightness non-uniformities due to dark zones caused by the black matrix, leading to banding issues and reduced resolution, particularly when using square pixel matrices and vertically aligned lenses.
Innovation Solution
The design incorporates a display panel with sub-pixels arranged in orthogonal rows and columns, where sub-pixels have opposing sides slanted relative to the display area, and a repeating color pattern every two or more rows, allowing for non-slanted view forming arrangements that reduce banding and improve color distribution, enabling easier manufacturing and better text rendering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If vertically aligned lenticular lenses are used with square pixel matrices, then the manufacturing is simpler and easier, but brightness non-uniformities occur due to dark zones caused by the black matrix, leading to banding issues
Solution Approach 1:
The patent applies asymmetry by slanting the lenticular lenses at an acute angle relative to the column direction of the display pixel array. This asymmetric orientation disrupts the regular alignment between the black matrix and lens projections, thereby eliminating the banding effect caused by periodic dark zones while maintaining manufacturing feasibility.
Solution Approach 2:
The patent changes the orientation parameter of the lenticular lenses from vertical alignment to a slanted configuration. This parameter change modifies the optical path and projection geometry, distributing the black matrix imaging effects across different spatial locations and reducing visible banding while preserving brightness uniformity.
2Illumination intensity
If slanted lenticular lenses are used, then brightness uniformity improves and banding is reduced, but the 3D pixels become non-rectangular and are not arranged along row and column directions, introducing aliasing for horizontal and vertical lines
Solution Approach 1:
The patent optimizes the slant angle parameter of the lenticular lenses to achieve a balance between brightness uniformity and image quality. By carefully selecting the acute angle, the patent reduces banding effects while minimizing the introduction of aliasing artifacts in text and computer graphics displays.
Solution Approach 2:
The patent addresses local quality issues by optimizing the slant angle specifically for different display content types. The configuration provides improved brightness uniformity for general displays while accepting controlled aliasing in specific scenarios like text and computer graphics, where the slant angle is optimized to minimize overall visual artifacts.
3Illumination intensity
If slanted lenticular lenses are used, then different views with near constant brightness are achieved, but the resolution loss is distributed between horizontal and vertical directions and the lens configuration becomes more complex
Solution Approach 1:
The patent employs asymmetric slanting of lenticular lenses to achieve constant brightness across different viewing angles. This asymmetric configuration distributes resolution loss more evenly between horizontal and vertical directions while maintaining a relatively simple manufacturing process compared to fully three-dimensional lens arrangements.
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 approach results in a 3D display with reduced banding, smooth transitions, and improved color distribution, maintaining high quality without the need for slanted lenses, while allowing for cost-effective and easier manufacturing.
Implementation Method 1
An array of elongated lenses extending parallel to one another overlies the display pixel array and acts as a view forming means. Outputs from the display pixels are projected through these lenticular lenses, which function to modify the directions of the outputs.
Data Source
AI summary
An autostereoscopic display device has a particular design of display panel for use with a forming arrangement having non-slanted view forming elements (being for example a lenticular or parallax barrier array). The display panel sub-pixels incorporate a slant into their shape. The display panel is designed to enable low slant angles while still enabling efficient mapping of the 2D display panel pixels to the 3D pixels, allow for square 3D sub-pixels on rectangular grid which gives better distribution of color components with improved uniformity and improved rendering in 3D mode.