Hologram Light Guide Plate Layout to Suppress Diffraction Noise
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Solution Overview
Problem
Existing light guide plates in display devices, such as head-up displays for vehicles, suffer from image quality degradation due to inappropriate arrangement of diffraction cells, leading to displacements or noise light beams in a straight line, which deteriorate the displayed image.
Innovation Solution
The light guide plate incorporates a first hologram element with diffraction cells where at least one edge line of each cell is positioned other than on the extensions of adjacent cells, and a second hologram element with all edge lines on adjacent cell extensions, utilizing polygonal shapes like regular hexagons, squares, and equilateral triangles to prevent straight-line edge alignment, and employs step-and-repeat exposure for efficient creation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If diffraction cells are arranged with edge lines on extensions of adjacent cells, then manufacturing simplicity is improved, but image quality deteriorates due to straight-line displacements and noise light beams
Solution Approach 1:
The patent applies asymmetry by intentionally designing the diffraction cell arrangements to be non-uniform. Specifically, at least one edge line of a diffraction cell is positioned at a location that does not lie on the extension of edge lines of adjacent diffraction cells. This asymmetric arrangement breaks the straight-line continuity that causes noise and displacement artifacts, thereby improving image quality while maintaining manufacturing efficiency through the use of regular polygonal shapes like hexagons, squares, and equilateral triangles.
2Ease of manufacture
If regular polygonal shapes are used for diffraction cells, then ease of manufacture is improved, but image quality may deteriorate due to potential straight-line edge alignment
Solution Approach 1:
The patent applies local quality by differentiating the arrangement characteristics of individual diffraction cells within the overall pattern. While all cells maintain regular polygonal shapes for manufacturing ease, their positions are locally adjusted so that edge lines of at least one cell do not align with extensions of adjacent cells. This localized variation in positioning prevents straight-line noise while preserving the manufacturing advantages of regular shapes.
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 design effectively reduces image quality deterioration by preventing straight-line displacements and noise light beams, improving image clarity and efficiency in creating the hologram elements.
Implementation Method 1
a first hologram element including a plurality of diffraction cells
Data Source
AI summary
A light guide plate includes a first hologram element including a plurality of diffraction cells. At least one of edge lines of one diffraction cell among the plurality of diffraction cells included in the first hologram element is located at a position other than on extensions of all edge lines of an adjacent diffraction cell adjacent to the one diffraction cell, the adjacent diffraction cell being included in the plurality of diffraction cells.