Backlight Module Light-Splitting Structure for 3D Display Brightness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current 3D display technologies, such as parallax barrier and lenticular lens array, suffer from low light usage and brightness issues, and require complex circuitry and optical aberrations for 2D display modes.
Innovation Solution
A backlight module with a light guide plate, edge light source, and a light-splitting structure comprising alternately disposed strip-shaped first and second light-splitting units with grating strips, which direct light to specific positions for 3D display, eliminating the need for a parallax barrier and optical lenses, and allowing switching between 3D and 2D modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If parallax barrier or lenticular lens array is used for 3D display, then 3D display function is achieved, but light usage efficiency decreases and brightness reduces
Solution Approach 1:
The light guide plate is segmented into multiple light guide regions (first, second, third light guide regions) with different optical properties. Each region directs light to specific viewing angles, enabling 3D display without blocking light. This segmentation allows different portions of light to reach different eyes simultaneously, achieving high brightness and efficient light usage.
Solution Approach 2:
The patent transitions from 2D light emission to 3D light distribution by creating multiple light guide regions with different optical paths. Light is directed in three-dimensional space to different viewing positions, enabling stereoscopic display while maintaining high light efficiency through spatial separation of light paths.
2Adaptability or versatility
If parallax barrier is used for 3D display, then 3D effect is achieved, but device complexity and cost increase
Solution Approach 1:
The 3D display function is merged into the backlight module itself by integrating multiple light guide regions directly into the light guide plate. This eliminates the need for separate parallax barrier components and complex control circuitry, reducing device complexity while maintaining 3D display capability.
Solution Approach 2:
The light guide plate performs multiple functions: it provides uniform backlight illumination and simultaneously creates 3D display effects through its segmented light guide regions. This multi-functionality eliminates the need for additional dedicated 3D components, simplifying the overall device structure.
3Adaptability or versatility
If lenticular lens array is used for 3D display, then 3D display is achieved, but optical aberrations occur and device thickness increases
Solution Approach 1:
The patent extracts the 3D display function from separate optical components (lenticular lenses) and integrates it directly into the light guide plate structure. This eliminates the need for additional lens layers, reducing device thickness while maintaining 3D display capability.
4Adaptability or versatility
If directional backlight is used for 3D display, then 3D effect is achieved, but light usage efficiency decreases
Solution Approach 1:
Different regions of the light guide plate are assigned different optical qualities and light directing characteristics. Each light guide region is optimized to direct light to specific viewing angles, ensuring that light is efficiently directed where needed rather than wasted, thereby improving overall light usage efficiency while maintaining 3D display capability.
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 solution increases brightness and reduces the cost, thickness, and weight of 3D display devices while providing efficient light usage and improved 2D display quality by using the light-splitting structure to separate light for 3D display and utilizing an underlying light source for 2D mode.
Implementation Method 1
the separation of light is achieved by the diffraction and interference of the light through grating strips
Implementation Method 2
the separation of light is achieved by the diffraction and interference of the light through grating strips
Data Source
AI summary
A backlight module, a display device and a method for driving the same are disclosed, such that brightness of display device can be increased when rendering 3D display. The backlight module includes a light guide plate, a light-splitting structure and an edge light source, wherein the light-splitting structure includes a plurality of strip-shaped first light-splitting units and a plurality of strip-shaped second light-splitting units, the first light-splitting unit and second light-splitting unit are alternately disposed on the light output surface of the light guide plate, each of first light-splitting unit and second light-splitting unit comprises at least one grating strip, the first light-splitting unit is configured for directing light to output towards a first position external to the backlight module, and the second light-splitting unit is configured for directing light to emit towards a second position external to the backlight module. The backlight module is applied into the display device, such that the display device achieves 3D display function.