3D Display Device with Segmented Light Source Assemblies
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Solution Overview
Problem
Current 3D display technologies face challenges in providing clear 3D images without glasses, as they often suffer from reduced light efficiency and limited natural motion parallax due to the use of shutters, and existing methods like time-division backlight switching with cylindrical lenses result in resolution degradation.
Innovation Solution
A 3D display device incorporating a lenticular sheet and a cylindrical lens array, where light sources are switched through time division, and the display unit is divided into areas or fields with different illumination methods to optimize light usage, ensuring a clearer 3D image by varying the number of light sources and their arrangement based on the display angle range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shutters are used to display 3D images, then 3D depth perception is achieved, but light efficiency is reduced
Solution Approach 1:
The patent divides the backlight unit into multiple independent light source assemblies, each corresponding to different viewing angle ranges. This segmentation allows selective illumination of specific regions without requiring shutters, thereby maintaining light efficiency while achieving 3D depth perception through spatial separation of light paths.
Solution Approach 2:
The patent introduces a lenticular sheet as an intermediary component between the light sources and display panel. This lenticular sheet redirects light from specific light source assemblies to corresponding viewing angle ranges, enabling 3D depth perception without using shutters that would block light and reduce efficiency.
2Reliability
If time-division backlight switching with cylindrical lenses is used, then 3D display is achieved, but resolution is degraded
Solution Approach 1:
The patent divides the display into multiple angle ranges, with each range illuminated by dedicated light source assemblies. This segmentation eliminates the need for time-division switching and cylindrical lenses that cause resolution degradation, as each spatial region has its own optimized light path.
Solution Approach 2:
The patent transitions from time-division multiplexing to spatial division by arranging light source assemblies and lenticular elements in different spatial positions. This dimensional change allows simultaneous display of multiple viewing angles without the resolution loss associated with temporal switching methods.
3Device complexity
If a single light source illuminates the entire display, then simplicity is maintained, but cross-talk between viewing angles increases
Solution Approach 1:
The patent segments the illumination system into multiple light source assemblies, each responsible for a specific viewing angle range. This spatial segmentation prevents light from one viewing angle from interfering with another, thereby reducing cross-talk while maintaining reasonable system complexity.
Solution Approach 2:
The patent applies different illumination characteristics to different regions of the display. Each light source assembly provides localized illumination optimized for its corresponding viewing angle range, improving image quality and reducing cross-talk by ensuring that each region receives appropriate light from its dedicated source.
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 expands the display range of parallax directions, maintains high-definition display, and ensures a clearer 3D image by optimizing illumination for each area or field, reducing cross-talk and improving luminance efficiency.
Implementation Method 1
a lenticular sheet and a cylindrical lens array, where light sources are switched through time division
Implementation Method 2
a lenticular sheet and a cylindrical lens array, where light sources are switched through time division
Data Source
AI summary
A three-dimensional (3D) display device including: a display unit configured to display an image; a display driver configured to display, on the display unit, a plurality of first images based on a depth component of the image and a second image based on a planar component of the image; a first lens array including a plurality of first lens elements provided at a first pitch on a rear side of the display unit; a second lens array including a plurality of second lens elements provided at a second pitch wider than the first pitch of the plurality of first lens elements on a rear side of the first lens array; a plurality of light source assemblies respectively located on rear sides of the plurality of second lens elements and including a plurality of light sources; and a light source driver.