Backlight Module Yellow Film Edge Blue Coloring
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Solution Overview
Problem
Edge-lit backlight modules in liquid crystal display devices suffer from blue coloring on the edges due to excessive light emission, which affects color uniformity.
Innovation Solution
A reflection film with a yellow film component is integrated around the main body, positioned on the bottom surface of the light guide plate, to absorb refracted blue light, reducing edge light emission and enhancing color uniformity. The yellow film is strategically arranged with varying block sizes and densities to optimize absorption without affecting quantum dot excitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If edge-lit backlight module is used to reduce weight and achieve fashionable design, then weight and aesthetics are improved, but blue coloring appears on edges due to excessive light emission
Solution Approach 1:
The reflection film is designed with spatially varying properties: the first region (near edge-lit light source) has width 0-50mm, the second region (opposite to light source) has width 0-30mm, and the third and fourth regions (connecting first and second regions) have widths 0-20mm. This non-uniform structure creates different optical characteristics in different areas to suppress edge blue coloring while maintaining overall display quality.
Solution Approach 2:
The reflection film comprises multiple layers including a first reflection layer, second reflection layer, and third reflection layer with different reflective properties. This composite structure enables selective reflection and absorption of blue light wavelengths, effectively reducing edge blue coloring while maintaining other display performance.
2Object-affected harmful factors
If reflection film is added to suppress edge blue coloring, then color uniformity is improved, but device structure becomes more complex
Solution Approach 1:
The reflection film integrates multiple functional layers (first reflection layer, second reflection layer, third reflection layer) into a single composite component that performs both blue light suppression and general light reflection functions, reducing the need for separate components and simplifying overall structure.
Solution Approach 2:
The reflection film serves multiple functions simultaneously: it suppresses edge blue coloring, reflects useful light back into the light guide plate, and maintains color uniformity across the display. This multi-functionality reduces the need for additional specialized components.
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 reduces blue light emission from the edges, achieving uniform color across the display screen, improving the display image quality and competitiveness of the product with a simple and cost-effective structure.
Implementation Method 1
the yellow film is configured to absorb blue light refracted from the light guide plate to a periphery of the reflection film
Implementation Method 2
a quantum dot film, located on the light emitting surface of the light guide plate
Data Source
AI summary
A backlight module and a display. The backlight module includes: a light guide plate, the light guide plate including: a bottom surface and a light emission surface which are arranged opposite to each other, and a light incident surface connecting the bottom surface and the light emission surface; an edge-type light source, the edge-type light source being located on the light incident surface side of the light guide plate, a quantum dot film, located on the light emission surface of the light guide plate; and a reflection film, located on the bottom surface side of the light guide plate, the reflection film including a body and a yellow film located around the body, and the yellow film being configured to absorb blue light refracted from the light guide plate to the periphery of the reflection film.