Backlight Unit Light Guide Plates Couplers Holographic Display
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Solution Overview
Problem
Conventional holographic display methods require high-resolution and high-data-throughput spatial light modulators, leading to increased data requirements and potential viewer fatigue due to inconsistencies between depth perception and focus, especially in stereoscopic methods.
Innovation Solution
The proposed solution involves a backlight unit with a light source, multiple light guide plates, and couplers that expand and direct light beams to enhance light efficiency and coherence, allowing for binocular holographic image generation with reduced data throughput and improved resolution, using a combination of diffractive and refractive elements, and an eye-tracking device to adjust the beam direction for optimal viewer experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional holographic display method is used to provide full parallax and consistent depth perception, then image quality and viewer comfort are improved, but data throughput and resolution requirements increase significantly
Solution Approach 1:
The patent divides the holographic display into multiple viewing regions corresponding to different eyes (left eye and right eye). Each viewing region receives holographic images with specific viewing points tailored to that eye, segmenting the full holographic content into manageable portions that reduce overall data throughput requirements while maintaining full parallax and depth consistency for each eye
Solution Approach 2:
The patent transitions from providing holographic images for all possible viewing points in three-dimensional space to providing images only for specific viewing points corresponding to the two eyes. This dimensional reduction from continuous viewing space to discrete eye-specific viewing regions significantly reduces data requirements while preserving the essential holographic experience
2Reliability
If a spatial light modulator with very high resolution and data throughput is used, then complete holographic display is achieved, but device complexity and manufacturing costs increase
Solution Approach 1:
The patent implements partial action by generating holographic images only for the specific viewing points corresponding to the left and right eyes, rather than providing complete holographic coverage for all possible viewing points. This partial approach achieves sufficient holographic display completeness for the intended application while significantly reducing the resolution and data throughput requirements of the spatial light modulator
3Use of energy by moving object
If multiple couplers and light guide plates are used to expand and direct light beams, then light efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by designing the first output coupler to serve dual purposes: it acts as an output coupler for the first light guide plate and simultaneously as an input coupler for the second light guide plate. This eliminates the need for a separate input coupler, reducing the number of components and simplifying the overall structure while maintaining high light efficiency through effective light beam expansion and direction control
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 increases light efficiency and image quality, reduces viewer fatigue by providing consistent depth perception and full parallax, and allows for the display of high-quality holographic images with reduced hardware complexity and manufacturing costs.
Implementation Method 1
a first light guide plate configured to guide the light beam emitted by the light source and to expand the light beam in a first direction
Implementation Method 2
a first output coupler configured to direct the light beam to an outside of the first light guide plate
Data Source
AI summary
A backlight unit and a holographic display apparatus that includes a backlight unit are provided. The backlight unit includes a light source, a first light guide plate for guiding a light beam emitted by the light source in a first direction, a second light guide plate for guiding the light beam incident via the first light guide plate in a second direction, and an output/input coupler that is disposed between the first light guide plate and the second light guide plate.