Glassless 3D Display Backlight Unit with Segmented Diffraction
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Solution Overview
Problem
Current glassless 3D display technologies face challenges in reducing cross-talk and maintaining image quality, particularly when providing 3D images to multiple viewpoints, often resulting in decreased depth perception and increased cross-talk.
Innovation Solution
A glassless 3D display apparatus utilizing a single backlight unit with a light guide panel (LGP) and diffraction grating, which emits light in different directions to form 3D images on both sides, employing multiple light sources with different wavelengths and an optical transmission medium to minimize cross-talk and enhance depth perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a glassless 3D display uses a lenticular lens or parallax barrier layer to distribute images to the viewing space, then the 3D image can be viewed without glasses, but cross-talk increases and 2D image quality decreases
Solution Approach 1:
The backlight unit is divided into multiple light source portions (first, second, third light source portions) that emit different wavelengths of light. The light guide panel is segmented into multiple diffraction portions, each corresponding to specific light source portions and responsible for diffracting specific wavelength ranges into different directions for left and right eyes.
Solution Approach 2:
Different portions of the light guide panel have different diffraction characteristics optimized for specific wavelengths. The first diffraction portion handles red light, the second handles green light, and the third handles blue light, with each portion diffracting light in specific directions to reduce cross-talk for its designated wavelength range.
2Object-affected harmful factors
If multiple light sources with different wavelengths are used in the backlight unit, then the quality of 3D image and reduction of cross-talk is improved, but the device complexity increases
Solution Approach 1:
Multiple light source portions emitting different wavelengths are combined into a single integrated backlight unit. The light guide panel with multiple diffraction portions is merged into one component that handles all wavelength separations and diffractions, simplifying the overall structure while maintaining cross-talk reduction benefits.
Solution Approach 2:
The light guide panel serves multiple functions: it guides light from different light source portions, separates wavelengths through different diffraction portions, and directs light to both left and right viewing areas. This multi-functionality reduces the need for separate components for each function.
3Device complexity
If a single backlight unit is used to provide light for both front and rear display devices, then the device complexity is reduced, but the precision of light distribution to different viewpoints may be compromised
Solution Approach 1:
The single backlight unit is segmented into multiple light source portions with specific wavelength ranges, and the light guide panel is segmented into multiple diffraction portions. Each diffraction portion is precisely designed to handle specific wavelengths and direct them to appropriate viewing areas, maintaining high precision light distribution despite using a single backlight unit.
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 effectively reduces cross-talk and provides a 3D image with sufficient depth perception to multiple viewers by using a single backlight unit with a light guide panel and diffraction grating, allowing for simultaneous 3D image formation on both sides without the need for glasses.
Implementation Method 1
a light source unit configured to emit light in two directions that are different from each other by diffracting an incident light
Implementation Method 2
the LGP which is configured to facilitate a propagation of light emitted from the light source portions to the first and second display devices
Data Source
AI summary
A double-sided glassless three-dimensional (3D) display apparatus including a backlight unit may include an light source unit configured to emit light to the front and the rear thereof by diffracting incident light, and first and second display devices configured to use the light emitted by the light source unit as light for a 3D image formation and to form the 3D image on both sides of the light source unit. The light source unit may include a light source portion configured to emit three lights that have three different respective wavelengths and a light guide panel configured to transmit the lights emitted by the light source portion to the first and second display devices.