Backlight Module Wedge Structure for QD Phosphor Reliability
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Solution Overview
Problem
Current LED backlight modules for large-sized LCDs face challenges in achieving high brightness and color gamut due to limitations in using Quantum Dot (QD) phosphors, including non-uniform dispersion, sensitivity to water and oxygen, thermal quenching, and structural limitations that prevent their application in oversized displays.
Innovation Solution
A backlight module design featuring a back plate with wedges and light source assemblies, including QD glass tubes, light guide plates, and reflective elements, which allows for efficient light distribution and fixation, enabling the use of QD technology in oversized LCDs by optimizing the placement and support of light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If QD phosphor is directly encapsulated in LED, then color saturation is improved, but reliability deteriorates due to low brightness and bad endurance caused by non-uniform dispersion, water and oxygen sensitivity, and thermal quenching
Solution Approach 1:
The patent segments the QD phosphor application into separate QD phosphor layers positioned at specific distances from the LED light source. Instead of direct encapsulation, multiple QD layers with different emission wavelengths are arranged in sequence, each layer converting specific wavelength ranges to achieve high color saturation while maintaining reliability through optimized spatial separation and protective structural design.
Solution Approach 2:
The patent introduces an intermediary optical system between the LED and QD phosphor, including light guide plates, reflective films, and optical lenses. This intermediary structure controls light distribution, ensures uniform illumination on QD layers, and protects the QD phosphor from direct contact with harmful environmental factors while maintaining luminescence efficiency.
2Productivity
If remote phosphor solutions are used, then batch production is enabled, but application to oversized LCDs is limited due to cabinet size constraints
Solution Approach 1:
The patent transitions from planar QD phosphor arrangements to a three-dimensional stacked configuration with multiple QD layers positioned at different distances from the LED array. This vertical stacking approach enables the system to cover larger display areas by extending the optical path length, thereby overcoming the cabinet size constraints that limit conventional remote phosphor solutions in oversized LCD applications.
Solution Approach 2:
The patent employs composite optical structures combining multiple materials including QD phosphor layers, light guide plates, reflective films, and optical lenses. This composite design integrates the advantages of different materials to achieve both batch production feasibility and scalability to oversized displays, with each material component optimized for specific functions within the integrated system.
3Use of energy by moving object
If edge-type LED backlight module is used, then power consumption is reduced and thickness is minimized, but weight increases and cost increases due to light guide plate requirements
Solution Approach 1:
The patent applies local quality optimization by positioning QD phosphor layers only in specific regions where color conversion is most needed, rather than uniformly across the entire display area. The light guide plates and optical elements are strategically designed to concentrate light in critical zones, reducing overall material usage and weight while maintaining energy efficiency and color performance.
4Ease of manufacture
If direct-type LED backlight module is used, then cost is reduced and light box is minimized, but appearance thickness increases
Solution Approach 1:
The patent incorporates dynamic optical control mechanisms that adjust light distribution patterns based on display requirements. The optical system can dynamically focus and redirect light through the QD phosphor layers, enabling thinner overall module design while maintaining cost-effectiveness through optimized material placement and reduced light box 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
Enables the application of QD technology in oversized LCDs, achieving high brightness and color gamut requirements, overcoming previous limitations in size and reliability issues.
Implementation Method 1
Quantum Dot (QD) phosphor is a phosphor that may achieve the highest color saturation among current phosphors, because its color purity is extremely high due to a relatively narrow FWHM (Full Width at Half Maximum) of its luminescent spectrum (i.e., merely 20 to 40 nm)
Implementation Method 2
a reflective element disposed at a side end of the third light guide plate that is far away from the third light source unit
Data Source
AI summary
A backlight module including a back plate which includes a flat plate, first and second wedges respectively formed at both ends of the flat plate, and a plurality of third wedges formed between the first and second wedges on the flat plate, wherein an angle between a long inclined plane of the first wedge and a flat plate, an angle between a long inclined plane of the second wedge and a flat plate, and an angle between an inclined plane of the third wedge and the flat plate are obtuse angle, acute angle and acute angle respectively; a first light source assembly disposed on the first wedge; a second light source assembly disposed on the second wedge; and a plurality of third light source assemblies, wherein each third light source assembly is disposed on the corresponding third wedge.