Quantum Dot Light Source With Non-Uniform Reflection Points
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Solution Overview
Problem
Liquid crystal display devices face issues with uniform backlight distribution, leading to color variations due to excessive blue light at the center and insufficient blue light at the edges, resulting in bluish and yellowish displays.
Innovation Solution
A quantum dot light source device with a packaged printed circuit board and quantum dot package component, featuring reflection points on the upper substrate to enhance light ray reflection at the center, reducing blue light transmission and increasing red and green light proportions, ensuring consistent color across the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If blue LED light-emitting chips are used to excite quantum dot material to generate white light in a wide gamut of coloration, then the color gamut is improved to 100% NTSC, but the light distribution becomes non-uniform with excessive blue light at the center and insufficient blue light at the edges
Solution Approach 1:
The patent applies local quality by creating non-uniform reflectivity distribution on the upper substrate through selectively arranged reflection points. The reflection points have different reflectivity values corresponding to different regions, with higher reflectivity at the center and lower reflectivity at the edges. This local variation in optical properties compensates for the non-uniform light distribution, maintaining both wide color gamut and uniform brightness across the display area.
2Reliability
If quantum dot material is packaged between two layers of glasses to prevent invalidation at high temperature, then the reliability is improved, but the device complexity increases due to additional packaging structures
Solution Approach 1:
The patent merges multiple functions into the upper substrate by integrating both the protective packaging function and the light reflection function into a single component. The upper substrate serves as both the protective cover for the quantum dot material and the reflective element with strategically positioned reflection points. This consolidation reduces the number of separate components while maintaining thermal protection and enabling precise light distribution control.
3Reliability
If an air layer or thermally isolating layer is arranged between the quantum dot layer and the blue LED chip to prevent invalidation at high temperature, then the thermal protection is improved, but the light transmission efficiency decreases due to additional interfaces
Solution Approach 1:
The patent uses the upper substrate as an intermediary element that simultaneously provides thermal protection and maintains light transmission efficiency. Rather than placing a thermal isolation layer between the LED chip and quantum dot material, the upper substrate is positioned above the quantum dot layer, creating thermal distance while maintaining optical proximity. The reflection points on the upper substrate actively manage light distribution, compensating for any transmission losses and eliminating the need for separate thermal isolation layers.
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 addresses color inconsistency by increasing the proportion of red and green light, resulting in uniform light distribution and improved color accuracy across the display panel.
Implementation Method 1
blue LED light-emitting chips emit blue light to excite a quantum dot material to generate white light in a wide gamut of coloration
Implementation Method 2
there is at least one reflection point arranged on the upper substrate, and there are more light rays reflected by the at least one reflection point at the center of the upper substrate than light rays reflected at the peripheral edges of the upper substrate
Data Source
AI summary
The disclosure provides a quantum dot light source device, a backlight module, and a liquid crystal display device, where the quantum dot light source device includes an upper substrate, a lower substrate, and a quantum dot material layer packaged between the upper substrate and the lower substrate, and reflection points are arranged on the upper substrate so that the reflectivity of light rays by the reflection points at the center of the upper substrate is higher than the reflectivities of the light rays at the peripheral edges thereof.