Colored Reflective Structure Backlight Module for Pure White Light
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Solution Overview
Problem
Conventional backlight modules for LCDs face challenges in producing pure white light due to the use of white-yellowish light emitting diodes (WLEDs), which affect display quality, and the incorporation of colored particles in light guide plates (LGP) weakens the structural integrity of the LGP.
Innovation Solution
A backlight module with a light guide plate and a colored reflective structure, where some light beams are converted to reflected beams of a specific color, mixing with the original light to generate high-purity white light, without the need for additional materials in the LGP, thus maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If colored particles are incorporated into the light guide plate to convert white-yellowish light to pure white light, then the display quality is improved, but the structural integrity of the light guide plate is weakened
Solution Approach 1:
The invention separates the light conversion function from the light guide plate structure. Instead of incorporating colored particles into the LGP material, the patent uses a distinct colored reflective layer applied to the LGP surface or a separate component. This segmentation allows the LGP to maintain its structural integrity while the colored layer performs the light conversion function.
Solution Approach 2:
The invention introduces a colored reflective layer as an intermediary element between the white-yellowish light source and the display. This intermediate layer converts the light color without requiring modification of the light guide plate itself, thus preserving the LGP's structural strength while achieving pure white light output.
2Illumination intensity
If colored particles are sprayed into molten LGP preform during injection molding, then white light beams of high purity are generated, but the cross-linking of molecular structures is blocked and structural integrity is weakened
Solution Approach 1:
The invention extracts the colored particles from the injection molding process of the light guide plate. Instead of mixing colored particles into the molten LGP preform, the patent applies colored reflective material to the LGP after manufacturing or uses a separate colored component. This extraction eliminates the harmful effect on molecular cross-linking while maintaining the light conversion function.
Solution Approach 2:
The light guide plate is manufactured first with its complete molecular structure and structural integrity, then the colored reflective layer is added subsequently. This preliminary action ensures the LGP's molecular cross-linking is not interrupted during the light guide plate formation process, while the colored layer is added afterward to achieve the desired light conversion.
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 effectively generates high-purity white light for improved LCD display quality while maintaining the structural integrity of the light guide plate, enabling high-quality image display and withstanding potential shocks or vibrations.
Implementation Method 1
Some of the light beams emitting from the light sources are transmitted to the colored reflective structure and converted to reflected light beams having a corresponding color
Implementation Method 2
The reflected light beams further mix with light beams emitting from the light sources and generate light beams in desired color system
Data Source
AI summary
An exemplary backlight module (20) includes a light guide plate (22) having a light incident surface (224), a plurality of light sources (23) adjacent to the light incident surface, a frame (24) for receiving the light sources and the light guide plate, and a colored reflective structure (220) disposed in the frame. Some of the light beams emitting from the light sources are transmitted to the colored reflective structure and converted to reflected light beams having a corresponding color. The reflected light beams further mix with light beams emitting from the light sources and generate light beams in desired color system. A liquid crystal display (200) using the backlight module is also provided.