Binocular Holographic Display Backlight Unit with Segmented Viewing Zones
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Solution Overview
Problem
Current holographic display methods require high-resolution spatial light modulators and large amounts of processed data to provide full parallax, leading to eye fatigue due to discordance between depth recognition by the brain and eyes, and are limited in the number of viewpoints displayed.
Innovation Solution
A binocular holographic display apparatus with a backlight unit (BLU) that includes a light source unit, a transparent light guide plate, input and output couplers, and an achromatization element, which provides coherent illumination light to two viewing zones, allowing for independent 3D images with different viewpoints for each eye, reducing processed data and eye fatigue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a full holographic display method is used to provide full parallax, then the number of viewpoints displayed is improved, but the amount of processed data and resolution requirements increase significantly
Solution Approach 1:
The patent divides the holographic display into separate viewing zones for the left and right eyes, with each zone receiving hologram images optimized for that specific eye. This segmentation allows the system to process and display fewer viewpoints per eye (reducing data quantity) while still providing full parallax capability through the combined binocular effect.
2Manufacturing precision
If a high-resolution spatial light modulator is used to display full holographic images, then the image quality is improved, but the device complexity and data processing requirements increase
Solution Approach 1:
The patent applies local quality by providing different hologram images optimized for specific viewing zones (left eye and right eye) rather than attempting to display all viewpoints simultaneously across the entire display area. This allows each region to be optimized for its specific function, reducing the overall complexity requirements.
3Device complexity
If conventional 3D display methods are used, then the device complexity is reduced, but eye fatigue occurs due to discordance between depth recognition and eye focus
Solution Approach 1:
The patent uses a light guide plate as an intermediary element to deliver coherent illumination light to multiple viewing zones. This intermediary structure enables the system to provide separate optimized images for each eye without requiring complex additional optics, maintaining relative system simplicity while achieving the depth focus concordance needed to reduce eye fatigue.
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 enables the display of hologram images with different viewpoints to each eye, aligning depth recognition with eye focus and providing full parallax without the need for high-resolution spatial light modulators, thus reducing eye fatigue and data processing requirements.
Implementation Method 1
a light guide plate that is transparent and includes a light incidence surface onto which the illumination light, provided from the light source unit, is incident and a light emission surface which emits the illumination light
Implementation Method 2
an input coupler that advances the illumination light, incident onto the light incidence surface of the light guide plate, into the light guide plate; and an output coupler that is disposed on the light emission surface of the light guide plate to emit the illumination light outside the light guide plate
Data Source
AI summary
A backlight unit (BLU), for a binocular holographic display apparatus, and the binocular holographic display apparatus including the BLU are provided. The BLU includes: a light source unit that emits coherent illumination light; and a light guide plate that is transparent and includes a light incidence surface onto which the coherent illumination light emitted by the light source unit is incident and a light emission surface through which the illumination light is output. The light source unit includes a beam deflector that adjusts an incidence angle of the illumination light incident onto the light guide plate.