Backlighting Device Switching 3D 2D Modes
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Solution Overview
Problem
Current 3D display devices lack an efficient mechanism to seamlessly switch between 3D and 2D display modes, particularly in terms of backlighting systems, which affects the angular distribution and uniformity of light for stereoscopic and non-stereoscopic views.
Innovation Solution
A backlighting device utilizing a light guide plate with a prismatic pattern on the top face and a linear pattern on the bottom face, combined with a light redirecting film and reflecting film, allows for switching between 3D and 2D display modes by altering the angular distribution of light beams, enabling efficient extraction and redirection of light for both modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single backlighting system is used for both 3D and 2D display modes, then device complexity is reduced, but the ability to provide optimal angular distribution and uniformity for both modes simultaneously deteriorates
Solution Approach 1:
The patent implements a switchable backlighting system where the controller dynamically activates or deactivates specific light sources based on the display mode. In 3D mode, first and second light sources are activated with specific angular distributions, while in 2D mode, different light sources are activated. This dynamic switching allows a single backlighting device to adapt to different display requirements without requiring physically separate systems for each mode.
2Illumination intensity
If separate backlighting systems are used for 3D and 2D modes, then angular distribution and uniformity for each mode are optimized, but device complexity and thickness increase
Solution Approach 1:
The patent designs a universal backlighting system where a single set of light guides and light sources serves both 3D and 2D display modes. The light guides are configured with specific geometric features (inclined surfaces, reflective surfaces) that enable them to function in multiple modes. By making the backlighting system multi-functional, the patent achieves optimized angular distribution for both modes without requiring separate dedicated systems, thereby reducing overall device complexity and thickness.
Solution Approach 2:
The backlighting system is segmented into multiple independent light sources (first light source, second light source) and corresponding light guides that can be selectively activated. This segmentation allows the system to optimize performance for different modes by activating specific segments appropriate for each mode, while maintaining a compact integrated structure that avoids the complexity of completely separate systems.
3Illumination intensity
If multiple light sources are activated simultaneously for 3D mode, then illumination intensity and uniformity are improved, but energy consumption increases
Solution Approach 1:
The controller dynamically manages power consumption by selectively activating only the necessary light sources based on the current display mode and content requirements. Rather than continuously powering all light sources at maximum intensity, the system adjusts which light guides and light sources are active, optimizing the balance between illumination quality and energy consumption in real-time.
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 high-quality, efficient illumination for both 3D and 2D display modes with reduced thickness and easy switching between modes, providing uniform and directed light for enhanced viewing experiences.
Implementation Method 1
a first light beam emitted from a first lighting towards one of a front face and a back face of the substrate, wherein the substrate includes a prismatic pattern disposed on a top face of the substrate, and a linear pattern disposed on a bottom face of the substrate, extracts the first light beam incident to the substrate
Data Source
Figure 1
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Figure 2B
AI summary
A light guide plate and a backlighting device including the light guide plate are disclosed. The light guide plate may include a substrate configured to propagate a first light beam or a second light beam inside the substrate based on an effect of total internal reflection, a prismatic pattern configured to couple the first light beam out of the substrate in a three-dimensional (3D) display mode, and a linear pattern configured to couple the second light beam out of the substrate in a two-dimensional (2D) display mode.