Backlight Module with Point Light Sources and Heat Sink Shelves
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Solution Overview
Problem
Current backlight technologies face challenges in applying quantum dot (QD) technology to ultra-large displays due to size limitations, fragility of glass tubes, and high production costs, especially with traditional edge-lit LEDs and light guide plates, which restrict the use of QD films and tubes to smaller sizes and specific designs.
Innovation Solution
A backlight module design featuring a substrate with a reflective plate, light guide plates with intervals, point light sources fixed on heat sink shelves, and a diffuser plate, along with dot diffusion films and reflective plates, which reduces the module's width and thickness, enabling better application to large-scale displays and combining with QD technology to lower production costs and improve uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If QD fluorescent powder is directly packaged in LED, then color purity is improved, but reliability and luminance deteriorate due to thermal quenching and sensitivity to water and oxygen
Solution Approach 1:
The patent introduces an intermediary encapsulation structure consisting of a lower encapsulation layer and an upper encapsulation layer that seal the QD fluorescent powder between them. This intermediary protective structure isolates the QD powder from water and oxygen while allowing light transmission, thus maintaining both color purity and reliability simultaneously
2Illumination intensity
If QD film is used for ultra-large products, then color purity is improved, but manufacturing capability deteriorates due to size limitations of QD films
Solution Approach 1:
The patent segments the QD-containing light guide plate into multiple manageable portions that can be manufactured separately and then assembled together using alignment structures. This segmentation allows the system to achieve ultra-large dimensions while maintaining manufacturing feasibility through modular construction
3Use of energy by moving object
If edge-lit LED design is used, then energy consumption is reduced and thickness is decreased, but device complexity increases due to requirement of light guide plate and supportive structures
Solution Approach 1:
The patent merges multiple functions into the light guide plate structure: it serves as both the light distribution medium and the supportive structure for QD tubes, while also incorporating alignment marks and positioning features directly into the plate design. This integration reduces the need for separate components and simplifies the overall device structure
4Illumination intensity
If QD tube is used for edge-lit LED, then color purity is improved, but ease of assembly deteriorates due to fragility of glass tubes
Solution Approach 1:
The patent implements beforehand cushioning by designing a protective lower encapsulation layer that surrounds and cushions the fragile QD tube before assembly is complete. This protective structure prevents damage during handling and assembly while maintaining the optical performance of the QD tube
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 design allows for the effective application of QD technology on ultra-large panels, reduces production costs, and eliminates dark/bright band defects by ensuring good backlight uniformity and reduced light mixing distance, facilitating a narrow-frame and ultra-thin design for large-size displays.
Implementation Method 1
backlight source components, wherein the backlight source components comprise heat sink shelves
Implementation Method 2
heat sink shelves
Implementation Method 3
a first reflective plate disposed on a bottom surface of the substrate
Implementation Method 4
a plurality of light guide plates disposed on the first reflective plate
Implementation Method 5
light guide plates
Implementation Method 6
The spectrum of light emitted by quantum dot (QD) fluorescent powder has a narrow full width at half maximum (FWHW), ranging from 20 a to 40 nm, so its color purity is extremely high
Implementation Method 7
a diffuser plate which is disposed between the set of optical films and the substrate
Data Source
AI summary
A backlight module includes a substrate having an opening on top, a first reflective plate disposed on a bottom surface of the substrate, light guide plates disposed on the first reflective plate with intervals in between, backlight source components, and a plurality of optical films disposed on the opening of the substrate. The backlight source components comprise heat sink shelves, and point light sources that are fixed on the heat sink shelves and inserted in the interval between two neighboring light guide plates. The present invention effectively reduces the width and thickness of the backlight module, and is instrumental for a narrow-frame and ultra-thin design, effectively reduce production cost. Meanwhile, the arrangement ensures good backlight uniformity, and is instrumental in reducing the distance needed for light mixing. Additionally, the defect of dark band appearing around the backlight module of traditional backlight modules can be effectively eliminated.