Directional Backlight 3D Display With Beam Splitting for Low Crosstalk
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Solution Overview
Problem
Existing naked-eye 3D display technologies face issues such as high crosstalk, resolution loss, and limited viewing distance, especially in multi-person viewing scenarios, due to unseparated image and light sources, leading to flickering and reduced display quality.
Innovation Solution
A flicker-free directional backlight naked-eye 3D display device with an image control module, human eye tracking, a directional backlight module, and a triangular prism-shaped microstructural directional beam-splitting film, which separates and directs light beams to individual viewers, reducing horizontal resolution loss while maintaining vertical resolution and minimizing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional naked-eye 3D display uses a single image source for multiple viewers, then device complexity is reduced, but crosstalk increases and resolution loss occurs
Solution Approach 1:
The patent divides the image source into multiple independent image sources, with each image source dedicated to a specific viewer. This segmentation allows each viewer to receive their own optimized 3D image without interference from other viewers, thereby reducing crosstalk and resolution loss while maintaining manageable device complexity through modular architecture
Solution Approach 2:
Each image source is independently optimized for its corresponding viewer's specific viewing conditions, including viewing angle, distance, and eye position. This local quality approach ensures that each viewer receives a 3D image tailored to their individual viewing parameters, minimizing crosstalk and maximizing image quality without requiring complex global optimization
2Reliability
If a high-refresh rate LCD screen is used to reduce flickering, then flicker is reduced, but display data bandwidth and switching flicker increase
Solution Approach 1:
The patent employs periodic action by synchronizing the refresh rate of each image source with the natural flicker fusion threshold of the human eye (around 60 Hz). By using independent image sources that can be refreshed at optimized intervals rather than requiring ultra-high refresh rates, the system eliminates perceptible flicker while reducing the overall display data bandwidth requirement compared to traditional single-image-source approaches
Solution Approach 2:
By segmenting the display into multiple independent image sources, each can be refreshed independently at lower rates without causing perceptible flicker. This segmentation allows the system to achieve flicker-free display quality with reduced total bandwidth requirements compared to a single high-refresh-rate display
3Manufacturing precision
If a lens array is used at pixel level to achieve lossless 3D display, then resolution loss is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent eliminates the need for pixel-level lens arrays by using independent image sources for each viewer. Each image source can be directly coupled to its corresponding viewer without requiring precise lens-pixel alignment, thereby dramatically reducing manufacturing precision requirements while still achieving lossless 3D display quality through the segmented architecture
Solution Approach 2:
The patent extracts and removes the complex pixel-level lens array component from the system. By using independent image sources that directly project to each viewer's eyes, the system eliminates the need for intermediate lens arrays, simplifying the manufacturing process while maintaining lossless 3D display quality
4Adaptability or versatility
If a directional backlight module with multiple backlight units is used for multi-person viewing, then viewing zone is expanded, but device complexity and backlight determination difficulty increase
Solution Approach 1:
The patent segments the backlight system into multiple independent backlight units, with each backlight unit dedicated to illuminating a specific image source for a particular viewer. This segmentation allows the system to expand the viewing zone to accommodate multiple viewers while keeping each backlight control independent and manageable, thereby reducing overall device complexity despite the increased number of components
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
Enables high-quality, ultra HD 3D images for multiple viewers without flickering, by optimizing backlight units and beam-splitting film to adapt to viewer positions, reducing display data bandwidth and crosstalk, and eliminating the need for high-refresh rate LCD screens.
Implementation Method 1
triangular prism-shaped microstructural directional beam-splitting film, which separates and directs light beams to individual viewers
Implementation Method 2
a light beam emitted by each backlight unit is shaped into a directional light beam by the light shaping film layer
Data Source
AI summary
The present invention relates to the technical field of naked-eye 3D display, and provides a flicker-free directional backlight naked-eye 3D display device for multi-person viewing. An image control module converts image data into a 3D image, and a parallax 3D image is output to a first or Nth viewer through the cooperation of a display unit, a triangular prism-shaped microstructural directional beam-splitting film, and a directional backlight module, a quantity of viewers is determined by a human eye position signal in a display area collected by a human eye tracking module. The directional backlight module provides motion parallax, and the triangular prism-shaped microstructural directional beam-splitting film provides binocular parallax, so that the resolution is lost by only half in a horizontal direction and remains unchanged in a vertical direction, so that ultra HD 3D images can be implemented for one or more persons.