Backlight Module Peripheral Conversion Layer for Bezel Blue 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
1Use of energy by moving object
If a blue Mini LED is used as a backlight source, then the display can achieve high brightness and energy efficiency, 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 first optical processing layer, where blue light leakage occurs. This localized conversion of blue light to other wavelengths (yellow, red, or green) addresses the harmful effect only where it occurs, without affecting the overall energy efficiency of the Mini LED backlight source.
Solution Approach 2:
The patent converts the harmful blue light leakage into beneficial full-spectrum light by introducing a second color conversion layer that transforms the leaked blue light into yellow, red, or green light. This converts the harmful monochromatic blue light into useful complementary colors, improving overall light quality and reducing color bias at the periphery.
2Object-affected harmful factors
If the second color conversion layer is added to convert blue light, then blue light leakage is reduced, but the device structure becomes more complex
Solution Approach 1:
The patent segments the color conversion function into two distinct layers: a first color conversion layer for primary color conversion and a second color conversion layer specifically for addressing blue light leakage at the periphery. This segmentation allows each layer to perform its specialized function efficiently, reducing the need for complex adjustments in a single-layer system.
Solution Approach 2:
The patent addresses the blue light leakage problem by adding a spatial dimension to the color conversion approach. The second color conversion layer is positioned at the peripheral edge region of the first optical processing layer, creating a zone-based solution that targets the specific location where blue light leakage occurs, rather than uniformly treating the entire backlight area.
3Ease of manufacture
If uniform color conversion is applied across the entire backlight, then manufacturing is simplified, but blue light leakage at edges remains unaddressed
Solution Approach 1:
The patent implements local quality by configuring the second color conversion layer to be present only at the peripheral edge region of the first optical processing layer, with gradual reduction in density toward the middle display region. This localized approach targets blue light leakage specifically at the edges while maintaining manufacturing feasibility through controlled material distribution.
Solution Approach 2:
The patent applies parameter changes by varying the density of the second color conversion layer across different regions. The density gradually reduces from the peripheral edge region toward the middle display region, creating an optimized distribution that addresses blue light leakage where it occurs while minimizing unnecessary material in regions where it is not needed.
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
Effectively reduces blue light leakage by ensuring uniform light conversion and scattering, improving image quality by minimizing color differences at the edges.
Implementation Method 1
the first color conversion layer is configured to convert the monochromatic light emitted by the colored light source plate and incident into the first color conversion layer, into white light
Implementation Method 2
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
Implementation Method 3
the plurality of first optical processing layers are each configured to scatter light incident into the first optical processing layer
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.