Backlight Module Frame Dyes Absorb Blue Halo
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Solution Overview
Problem
Conventional display devices with backlight modules experience uneven image display due to unconverted blue light from the edges forming a blue halo, which affects the uniformity of the displayed image.
Innovation Solution
Incorporating dyes of specific colors into the frame of the backlight module to absorb unconverted light, combined with multiple color conversion layers and optical films, ensures that unconverted light is absorbed, preventing the formation of halos and achieving uniform light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color converting layer is used to convert blue light to white light, then white light can be obtained for display, but a blue halo appears at the peripheral portion of the backlight module causing uneven display image
Solution Approach 1:
The patent converts the harmful unconverted blue light into a beneficial effect by using a frame with dye that absorbs the blue light and converts it to other wavelengths through fluorescence, transforming the blue halo problem into a useful light conversion process that improves display uniformity
Solution Approach 2:
The frame with dye acts as an intermediary element between the blue light source and the display panel, absorbing and converting the problematic blue light before it reaches the display area, thereby eliminating the blue halo effect
2Use of energy by moving object
If the color conversion layer is positioned close to the light sources, then conversion efficiency is improved, but the blue halo effect becomes more pronounced at the edges
Solution Approach 1:
The patent applies different functional properties to different parts of the system: the central area uses efficient color conversion while the peripheral frame area uses blue light absorption and fluorescence conversion, creating local quality differences that solve the blue halo problem without sacrificing overall efficiency
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 eliminates light halos by absorbing unconverted light, resulting in improved display quality and uniformity of the backlight module's output, enhancing the overall display image.
Implementation Method 1
the backlight module generally includes LEDs emitting blue light and a color converting layer to convert the blue light to light of other color, so white light can be obtained
Implementation Method 2
The frame includes dyes of yellow color. When the first color light emitted by the light source passes through the color conversion layer, a portion of the first color light is not converted into a second color light. The dyes in the frame can absorb a portion of the unconverted light that is incident on the frame
Data Source
AI summary
A backlight module includes a substrate, a plurality of light sources on a surface of the substrate, a color conversion layer on a side of the plurality of light sources away from the substrate, and a frame between the substrate and the color conversion layer. Each light source is a light emitting diode chip configured for emitting light of a first color. The color conversion layer is configured for converting light to light of a second color. The frame surrounds the light sources. The frame includes dyes configured to absorb the light of the first color.