Backlight Module Edge Color Conversion for Blue Light Leakage
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Solution Overview
Problem
Existing NB Mini LED LCDs experience blue light leakage at the peripheral bezel due to insufficient conversion of blue light into white light at the edges of the backlight module, leading to poor image quality.
Innovation Solution
A backlight module design featuring a colored light source plate, first and second color conversion layers, and optical processing layers, with a gradient distribution of the second color conversion layer density from the peripheral edge to the middle display region, converting monochromatic light into white light and scattering it uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a blue Mini LED is used as a backlight source, then high brightness and energy efficiency are achieved, but blue light leakage occurs at the peripheral bezel
Solution Approach 1:
The patent applies local quality by placing a second color conversion layer specifically at the peripheral edge region of the optical processing layer, where blue light leakage occurs. This localized color conversion structure converts blue light to yellow light only at the problematic peripheral regions, while the central display region uses the first color conversion layer for full-spectrum white light generation. This resolves the contradiction by addressing blue light leakage locally without compromising overall backlight brightness.
Solution Approach 2:
The patent introduces a second color conversion layer as an intermediary element between the blue light source and the display panel at the peripheral regions. This intermediary layer converts harmful blue light into yellow light, which then mixes with remaining blue light to produce white light, effectively eliminating blue light leakage while maintaining brightness at the periphery.
2Object-affected harmful factors
If a color conversion layer is added to convert blue light to white light, then blue light leakage is reduced, but device complexity increases
Solution Approach 1:
The patent segments the color conversion function into two distinct layers: a first color conversion layer for the central display region and a second color conversion layer for the peripheral edge region. This segmentation allows each layer to be optimized for its specific function and location, reducing overall complexity by assigning specialized roles rather than using a single complex color conversion system for the entire backlight.
Solution Approach 2:
The patent resolves complexity by transitioning from a uniform two-dimensional color conversion approach to a three-dimensional layered structure with spatial differentiation. The first color conversion layer covers the central region while the second color conversion layer is positioned at the peripheral edge region, creating a vertically and horizontally differentiated structure that simplifies the overall design by addressing different regions with appropriate conversion layers.
3Ease of manufacture
If the second color conversion layer is uniformly distributed, then manufacturing is simplified, but light scattering uniformity deteriorates
Solution Approach 1:
The patent applies local quality by creating a gradient distribution of the second color conversion layer at the peripheral edge region, with higher concentration at the edges gradually transitioning to lower concentration toward the center. This gradient structure optimizes light scattering uniformity by providing stronger color conversion at the periphery where blue light leakage is most severe, while gradually reducing conversion intensity toward the central display region, achieving both manufacturing feasibility and optical performance.
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 effectively reduces blue light leakage by ensuring uniform light conversion and scattering, improving image quality by minimizing color differences at the display module's edges.
Implementation Method 1
the first color conversion layer is configured to convert the light emitted by the colored light source plate and incident into the first color conversion layer, into white light
Implementation Method 2
the plurality of first optical processing layers are each configured to scatter light incident into the first optical processing layer
Implementation Method 3
the second color conversion layer is configured to convert the monochromatic light emitted by the colored light source plate and incident into the second color conversion layer, into white light
Data Source
AI summary
A backlight module, including a back plate, and a colored light source plate, a first color conversion layer and a plurality of first optical processing layers, which are on the back plate and sequentially arranged away from the back plate; where the backlight module further comprises a second color conversion layer on at least a side, away from the back plate, of one of the plurality of first optical processing layers farthest from the back plate; an orthographic projection of the second color conversion layer on the first optical processing layer is in a peripheral edge region of the first optical processing layer; and the second color conversion layer is configured to convert monochromatic light emitted by the colored light source plate and incident into the second color conversion layer, into white light.