Quantum-dot LED Backlight Module Segmentation
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Solution Overview
Problem
Quantum-dot (QD) material in LED displays is sensitive to temperature and light flux, requiring separation from the LED light source to maintain longevity and brightness, which contradicts the need for compact and high-brightness QD LED modules.
Innovation Solution
A QD LED display configuration using an LED that emits blue light with a color-shifted QD material, where a portion of the blue light is converted to green and red light, reducing flux on the QD material and incorporating spacer layers for heat conduction and a hermetic seal to enhance longevity and brightness, while maintaining a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LED light source is separated from the QD material to reduce flux exposure, then the longevity of QD material is improved, but the compactness and brightness of the QD LED module deteriorate
Solution Approach 1:
The QD structure is divided into multiple regions with different QD material properties. Some regions have QD material optimized for converting blue light to red and green light, while other regions have QD material with reduced concentration or different composition that allows blue light to pass through with minimal conversion. This segmentation allows the module to maintain compact dimensions while reducing overall flux exposure to the QD material.
Solution Approach 2:
Different regions of the QD structure have different optical properties tailored to their specific functions. The first regions contain QD material with high conversion efficiency for color generation, while the second regions contain QD material with properties optimized for blue light transmission. This local differentiation allows the system to achieve both compactness and reduced flux exposure simultaneously.
2Reliability
If the LED light source is separated from the QD material to reduce temperature exposure, then the reliability of QD material is improved, but the brightness and compactness of the module deteriorate
Solution Approach 1:
The QD structure segments light conversion functions from high-flux exposure areas. By creating regions where blue light passes through with minimal QD material interaction, the overall thermal load on the QD material is reduced while maintaining high brightness through efficient color conversion in dedicated regions.
Solution Approach 2:
The QD structure acts as an intermediary between the blue LED light source and the final displayed image. By strategically placing QD material in specific regions rather than uniformly across the entire structure, the system mediates between the need for color conversion and the need to minimize thermal exposure, achieving both reliability and brightness.
3Illumination intensity
If conventional QD material is used with full blue light flux, then the brightness is maximized, but the time to failure of QD material decreases
Solution Approach 1:
Instead of exposing all QD material to full blue light flux, the invention applies partial action by creating regions where blue light passes through with minimal or no QD material conversion. This partial exposure strategy maintains sufficient brightness through selective color conversion while dramatically reducing the cumulative flux exposure that leads to QD material degradation and failure.
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 configuration increases the longevity of the QD material, reduces time to failure, and improves backlighting brightness by up to 50% compared to conventional QD LED modules, while maintaining a compact footprint.
Implementation Method 1
A first portion of the blue light from the LED passes through the at least one first region and is converted by the QD material to red and green light
Implementation Method 2
at least one spacer layer and a support assembly that supports heat conduction away from the QD material and back to the circuit board that supports the LED
Data Source
AI summary
The QD LED module (10) disclosed herein includes a support assembly (40), a circuit board (20), an LED (30) operably supported by the circuit board, wherein the LED emits blue light (36G). The QD LED module also has a QD structure (60) supported by the support assembly and axially spaced apart from the LED surface. The QD structure has an active area (AR) that includes a first region (R1) of QD material and a second region (R2) that has no QD material. A first portion of the blue light passes through the first region and is converted to red light (36R) and green light (36G). A second portion of the blue light passes through the second region. The QD material has a CIE color point that is shifted toward the yellow portion of the color space.