Holographic Light Guide Cell Layout to Reduce Display Noise
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Solution Overview
Problem
Existing optical devices with holographic optical elements suffer from noise and visibility issues due to phase differences and intensity fluctuations at the boundaries of adjacent cells, particularly when large-area deflection units are used.
Innovation Solution
The display device incorporates a light guide body with first and second holographic optical elements, each comprising cells with distinct arrangements, sizes, and shapes to minimize noise overlap by diffracting and emitting image light in a manner that avoids overlapping phase differences and intensity fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If large-area deflection units with holographic optical elements are used, then the deflection capability and coverage area are improved, but noise and visibility issues occur due to phase differences and intensity fluctuations at cell boundaries
Solution Approach 1:
The patent applies local quality by making each cell within the holographic optical elements have different optical properties (different diffraction patterns, phases, or orientations). This ensures that noise and intensity fluctuations generated at the boundaries of adjacent cells are spatially distributed rather than coherent, thereby reducing visible noise while maintaining large-area coverage
Solution Approach 2:
The holographic optical elements are segmented into multiple smaller cells with distinct arrangements. By dividing the large-area deflection unit into numerous small cells with different local characteristics, the patent prevents coherent noise accumulation across the entire area while still achieving broad angular coverage through the collective diffraction of all cells
2Adaptability or versatility
If multiple holographic optical elements are used to expand angular coverage, then the deflection range is improved, but the complexity of arranging cells to avoid noise overlap increases
Solution Approach 1:
The patent employs asymmetric cell arrangements within each holographic optical element, where cells are deliberately positioned with different orientations, sizes, or spacing patterns. This asymmetric design ensures that noise patterns from different cells do not overlap constructively, enabling expanded angular coverage while managing arrangement complexity through systematic asymmetric design rather than random configuration
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 reduces noise visibility, enhances image clarity, and optimizes manufacturing efficiency by preventing noise overlap and reducing manufacturing time for larger holographic optical elements.
Implementation Method 1
the first image light being obtained by diffracting the image light propagating inside the light guide body
Implementation Method 2
the second image light obtained by diffracting the first image light propagating inside the light guide body
Data Source
AI summary
A display device includes a light guide body including first holographic optical element and a second holographic optical element, and an image light emitter that emits image light to the light guide body. In addition, the first holographic optical element includes a plurality of first cells for emitting first image light toward the second holographic optical element, the first image light being obtained by diffracting the image light propagating inside the light guide body. In addition, the second holographic optical element includes a plurality of second cells for emitting second image light obtained by diffracting the first image light propagating inside the light guide body. In addition, an arrangement of the plurality of first cells is different from an arrangement of the plurality of second cells.