Multi-view Pixel Directional Backlight Module for Naked-eye 3D Displays
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Solution Overview
Problem
Existing naked-eye 3D display technologies using directional backlight modules are limited by restricted viewing angles and high production costs, particularly due to the requirement for hexagonal light guide plates that are not compatible with rectangular displays and the inefficiency of nano-diffraction grating fabrication for large-scale applications.
Innovation Solution
A multi-view pixel directional backlight module utilizing stacked rectangular light guide plates with interleaved nano-diffraction gratings, where each plate has distinct viewing angles and color light sources, allowing for continuous distribution of viewing angles and efficient color switching, thereby overcoming the limitations of single-angle and high-cost hexagonal designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hexagonal light guide plates with nano-diffraction gratings are used to achieve multi-view directional backlight, then viewing angle distribution is improved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent segments the light guide plate into multiple rectangular layers, each layer containing pixel arrays that emit light in specific directions. By stacking multiple layers with different orientation angles, the system achieves multi-view directional backlight without requiring complex hexagonal structures or nano-diffraction gratings on single plates
Solution Approach 2:
The patent replaces expensive hexagonal light guide plates with nano-diffraction gratings with simpler, cheaper rectangular light guide plates that use pixel arrays and color filters. These rectangular plates are easier to manufacture using standard display industry processes, significantly reducing production cost while achieving the same multi-view effect
2Adaptability or versatility
If hexagonal light guide plates are used for directional backlight, then multi-view capability is achieved, but compatibility with rectangular displays is lost
Solution Approach 1:
The patent uses rectangular light guide plates that can serve multiple functions: they provide directional backlighting, support multiple viewing angles through stacked layers, and are compatible with standard rectangular display formats. This universal design allows the same structure to be applied across different display sizes and resolutions without requiring hexagonal geometry
3Manufacturing precision
If nano-diffraction grating fabrication is used to achieve pixel-level light direction, then viewing angle precision is improved, but production efficiency decreases for large-scale applications
Solution Approach 1:
The patent replaces the mechanical fabrication process of nano-diffraction gratings with an optical-electrical system using pixel arrays, color filters, and sequential light sources. This substitution allows for easier manufacturing and higher production efficiency while maintaining precise viewing angle control through the pixel array structure and optical design
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 a wide viewing angle and cost-effective implementation of multi-view naked-eye 3D displays by integrating multiple layers of rectangular light guide plates with Fresnel lens arrays for collimated light sources, enhancing industrial applicability and reducing production complexity.
Implementation Method 1
Diffraction of light in different viewing angles can be achieved by designing nano-diffraction grating pixels with different periods and different orientation angles
Implementation Method 2
Collimated polarized light is transmitted within the light guide plate by means of total reflection
Implementation Method 3
integrating multiple layers of rectangular light guide plates with Fresnel lens arrays for collimated light sources
Data Source
AI summary
A multi-view pixel directional backlight module and a naked-eye 3D display device are provided. The multi-view pixel directional backlight module includes at least two rectangular light guide plates closely stacked together. A light-emerging surface of the rectangular light guide plate is provided with multiple pixel arrays. Light emitted by pixels in a same pixel array is pointed to a same viewing angle, and different pixel arrays have different viewing angles. At least one side of each rectangular light guide plate is provided with a light source group. Light emitted by the light source group enters the corresponding light guide plate, then emerges from pixels of respective pixel arrays on the light-emerging surface of the light guide plate, and is totally reflected at positions other than positions of the pixels within the light guide plate. Each of the pixels is a nano-diffraction grating.