Backlight Unit LGP System for 2D/3D Display Crosstalk Reduction
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Solution Overview
Problem
Existing 3D image display technologies using parallax barrier and lenticular methods face challenges in modifying designs, high crosstalk between left and right images, and degradation of 2D image quality, limiting their ability to effectively switch between 2D and 3D displays.
Innovation Solution
A backlight unit with a light guide plate (LGP) system that includes first and second LGPs, where the first LGPs emit directional light for 3D images and second LGPs provide uniform light for 2D images, using a diffuser film and prism film to control light direction and luminance, allowing for easy switching between 2D and 3D modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If parallax barrier method or lenticular method is used for 3D display, then 3D image can be displayed without glasses, but crosstalk between left image and right image becomes high and design cannot be readily modified
Solution Approach 1:
The backlight unit is divided into multiple independent light guiding portions, each corresponding to different viewing angles. This segmentation allows precise control of light distribution to reduce crosstalk between left and right images while maintaining 3D display capability.
Solution Approach 2:
Different light guiding portions are designed with different optical properties to serve different functions. Specifically, some portions guide light for left image while others guide for right image, with localized quality variations that minimize interference and crosstalk between the two images.
2Adaptability or versatility
If parallax barrier method or lenticular method is used, then 3D display is achieved, but 2D display quality is degraded
Solution Approach 1:
The system dynamically switches between 3D and 2D display modes by controlling which light guiding portions are activated. In 2D mode, all light guiding portions work together to provide uniform illumination, while in 3D mode, specific portions are selectively activated to create stereoscopic effect without compromising 2D quality.
Solution Approach 2:
The backlight unit is designed to perform multiple functions: it can operate in 3D display mode by activating specific light guiding portions, and in 2D display mode by utilizing all portions together. This multi-functionality allows the same hardware to deliver high-quality 2D images while also enabling 3D display capability.
3Device complexity
If single waveguide with multiple light guiding portions is used, then device complexity is reduced, but light distribution control precision may be insufficient
Solution Approach 1:
The patent controls light distribution by varying parameters within a single waveguide structure, such as the refractive index, thickness, and geometric configuration of different light guiding portions. These parameter changes enable precise light control without requiring multiple separate components, thus maintaining simplicity while achieving precision.
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 improved image quality by reducing crosstalk and enhancing the display of both 2D and 3D images, with the ability to create a line light source for 3D and a surface light source for 2D, increasing the number of views and maintaining image quality across different distances.
Implementation Method 1
a light guide plate configured to guide the light from the plurality of light sources toward the display panel
Implementation Method 2
using a diffuser film and prism film to control light direction and luminance
Implementation Method 3
using a diffuser film and prism film to control light direction and luminance
Data Source
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AI summary
A backlight unit includes first light guide plates (LGPs) provided in a line shape, and second LGPs provided in a line shape and disposed between the first LGPs. The backlight unit may include a controller configured to control a plurality of light sources to provide a light to the first LGPs when a three-dimensional (3D) image is displayed on a display panel that receives the light from at least one of the first LGPs and the second LGPs, and to provide the light to the first LGPs and the second LGPs when a two-dimensional (2D) image is displayed on the display panel.