Backlight Module Integrating LED and Laser Light Sources
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current liquid crystal display devices face challenges in reducing the thickness of backlight modules due to the need for separate light guide plates for laser and LED light sources, which increases thickness and results in low light usage ratios and small lighting angles.
Innovation Solution
A backlight module design that incorporates a single light guide plate with different incident surfaces and a diffuser to combine LED and laser light sources, optimizing light coupling efficiency and reducing thickness by using complementary colors and mesh dots within the light guide plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If separate light guide plates are used for laser and LED light sources, then the lighting requirements are met, but the thickness of the backlight module increases
Solution Approach 1:
The patent combines laser and LED light sources into a single integrated light guide plate structure. The light guide plate includes a first light incident surface for LED light and a second light incident surface for laser light, allowing both light sources to be accommodated in one component rather than requiring separate light guide plates, thus reducing overall thickness.
Solution Approach 2:
The light guide plate is designed to perform multiple functions simultaneously: it guides light from both LED and laser sources, includes diffusion regions for both light types, and provides structural support. This multi-functional design eliminates the need for separate specialized components for each light source.
2Illumination intensity
If laser light source is added to achieve full color, then color performance is improved, but light coupling efficiency decreases due to small lighting angle
Solution Approach 1:
The light guide plate features locally optimized structures: a first diffusion region specifically designed for LED light with particular diffusion characteristics, and a second diffusion region for laser light with different diffusion properties. This local differentiation allows each region to optimize light coupling for its specific light source type, improving overall efficiency.
Solution Approach 2:
The diffusion regions act as intermediaries between the light sources and the display panel. The first diffusion region mediates LED light propagation, while the second diffusion region mediates laser light propagation, enabling efficient coupling of both light types to the liquid crystal panel despite their different lighting characteristics.
3Length of stationary object
If single light guide plate is used to reduce thickness, then structural complexity decreases, but manufacturing precision requirements increase
Solution Approach 1:
The patent incorporates preliminary positioning structures directly into the light guide plate design, including positioning protrusions and positioning grooves that are pre-formed during manufacturing. These structures ensure accurate positioning of LED and laser light sources before final assembly, reducing the need for post-assembly adjustment and maintaining precision requirements.
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 design enhances light coupling efficiency and reduces the overall thickness of the backlight module by addressing the limitations of small lighting angles and low light usage ratios, allowing for a thinner display device while maintaining effective light diffusion.
Implementation Method 1
a diffuser, and the plurality of laser light sources are aligned on the substrate, and the light guide plate comprises a first incident surface and a second incident surface adjacent to the first incident surface, and the light source of the first light source assembly and the first incident surface are oppositely positioned, and the plurality of laser light sources and the second incident surface are oppositely positioned, and the diffuser is positioned between the plurality of laser light sources and the second incident surface
Implementation Method 2
the light guide plate comprises mesh dots inside corresponding to the laser light sources; the light guide plate comprises mesh dots inside corresponding to the lights of the LED light sources
Data Source
AI summary
A backlight module includes a glue frame, a light guide plate, a first light source assembly, and a second light source assembly. The light guide plate and the first and second light source assemblies are accommodated in the glue frame. The first light source assembly includes a light source that includes LED light sources mounted on a substrate. The second light source assembly includes a plurality of laser light sources mounted on a substrate and a diffuser. The light guide plate includes first and second incident surfaces. The light source of the first light source assembly and the first incident surface are oppositely positioned. The laser light sources and the second incident surface are oppositely positioned. The diffuser is positioned between the laser light sources and the second incident surface with predetermined distances. Colors of the LED light sources and the laser light sources are complementary colors.