Segmented Light Guide Plate for Glasses-Free 3D Display
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Solution Overview
Problem
Current glasses-free 3D display technologies using flat panel displays face challenges in efficiently providing both 2D and 3D images without interference, often resulting in reduced light resolution or artifacts due to the need for physical barriers and complex structures.
Innovation Solution
A light guide plate (LGP) with alternately arranged first and second light guide segments, separated by a light barrier and using a diffuser to change light patterns from square dot to planar or stripe patterns, allowing for independent 2D and 3D image generation without mutual interference, and an anisotropic diffuser to compensate for discontinuous light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light guide plate is used for both 2D and 3D displays, then device complexity is reduced, but light resolution deteriorates due to mutual interference between 2D and 3D light paths
Solution Approach 1:
The light guide plate is divided into multiple segments: a first light guide segment for guiding 2D light and a second light guide segment for guiding 3D light. This segmentation allows independent optimization of light paths for each display mode, preventing mutual interference and maintaining high light resolution while using a single integrated plate structure.
Solution Approach 2:
Different regions of the light guide plate are designed with different optical properties. The first light guide segment has characteristics optimized for 2D light guidance, while the second light guide segment has characteristics optimized for 3D light guidance. This local differentiation enables each segment to perform its specific function effectively without interfering with the other.
2Measurement precision
If physical barriers are used to separate 2D and 3D light paths, then light resolution is improved, but device complexity increases due to additional components
Solution Approach 1:
The light barrier function is merged into the light guide plate itself through the alternating arrangement of first and second light guide segments. The segments act as inherent barriers to each other's light paths due to their different optical configurations, eliminating the need for separate physical barrier components while maintaining effective light path separation.
Solution Approach 2:
The light guide plate serves multiple functions simultaneously: it guides 2D light through the first segment, guides 3D light through the second segment, and acts as a built-in light barrier between the two paths. This multi-functionality reduces the overall device complexity by combining several functions into a single component.
3Measurement precision
If alternately arranged light guide segments are used, then light path separation is improved, but light distribution uniformity deteriorates due to discontinuous patterns
Solution Approach 1:
A diffuser is introduced as an intermediary element between the alternately arranged light guide segments and the display screen. The diffuser receives the discontinuous light patterns from the segmented light guide plate and transforms them into uniform light distribution, effectively mediating between the segmented light sources and the requirement for uniform illumination.
Solution Approach 2:
The diffuser changes the optical parameters of the light by scattering and redistributing the light rays. It transforms the discontinuous light pattern with high directionality from the alternately arranged segments into a continuous, uniform light distribution pattern suitable for high-quality display, effectively changing the spatial and angular parameters of the light.
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 easy switching between 2D and 3D displays with improved efficiency and clarity, reducing artifacts and maintaining light resolution by separating light paths and using diffusers to optimize light patterns for each mode.
Implementation Method 1
a diffuser (830) configured to change the output light corresponding to the first light guide segment to planar light (750) for generating a two-dimensional image
Implementation Method 2
change the output light corresponding to the second light guide segment to light with a stripe pattern (740) for generating a three-dimensional image
Implementation Method 3
an anisotropic diffuser to compensate for discontinuous light distribution
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A display apparatus, and a light guide plate (LGP) of the display apparatus are provided. The LGP may include a first light guide segment (111, 112) and a second light guide segment (121, 122) that are alternately arranged in a first directio (x-direction) n. The first light guide segment and the second light guide segment may be separated from each other by a light barrier (133). Light guided and output in the LGP may be diffused in one direction by an anisotropic diffuser (not shown). The first light guide segment may be configured to guide light from a first light source used to generate a two-dimensional (2D) image by providing the diffuser with areas to produce an illuminated plane. The second light guide segment may be configured to guide light incident from a second light source used to generate a three-dimensional image by providing the diffuser with areas for generating illimunated stripes.