Backlight Module Edge Light Conversion Layer for Chromaticity Uniformity
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Solution Overview
Problem
Direct type backlight modules using blue light diodes and quantum dot films achieve high color gamut but result in a bluish edge due to insufficient red and green light emission from the quantum dot film's edge area, affecting display quality.
Innovation Solution
A backlight module with a light conversion layer comprising first and second light conversion materials that emit red and green light, respectively, is applied to the edge area of the quantum dot film, ensuring uniform chromaticity by increasing the density and volume of these units from the center to the edge, thereby compensating for the lack of red and green light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a quantum dot film is used with blue light diodes to achieve high color gamut, then color reproduction is improved, but the edge area produces insufficient red and green light resulting in a bluish edge
Solution Approach 1:
The patent applies local quality by introducing a light conversion layer specifically in the edge area of the quantum dot film, where red and green light conversion materials are selectively placed to compensate for the insufficient red and green light emission in that region, while the center area maintains its original quantum dot film structure
Solution Approach 2:
The patent employs asymmetry by creating an asymmetric distribution of light conversion materials where the edge area has additional red and green light conversion capabilities compared to the center area, matching the non-uniform light emission characteristics of the quantum dot film edge
2Manufacturing precision
If light conversion materials are added to the edge area, then chromaticity uniformity is improved, but device structure becomes more complex
Solution Approach 1:
The patent segments the display structure into distinct functional zones: a center area with quantum dot film and an edge area with an additional light conversion layer, allowing independent optimization of each zone's optical properties without affecting the other
Solution Approach 2:
The light conversion layer acts as an intermediary element between the blue light diodes and the final displayed image, converting excess blue light into red and green light components that compensate for the chromaticity deficiency in the edge area
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 alleviates the bluish edge issue by enhancing red and green light emission in the edge area, improving chromaticity uniformity and display quality.
Implementation Method 1
a material of the light conversion layer includes a first light conversion material configured to emit red light under excitation of light from the light emitting element and a second light conversion material configured to emit green light under excitation light from the light emitting element
Data Source
AI summary
A backlight module and a display device are disclosed. The backlight module includes a light emitting element array including a plurality of light emitting elements that emit blue light; a quantum dot film disposed on a light-emergent side of the light emitting element array and having a middle area and an edge area, the edge area surrounding the middle area; and a light conversion layer disposed on the light-emergent side of the light emitting element array, wherein an orthographic projection of the light conversion layer on the quantum dot film is located in the edge area of the quantum dot film, a material of the light conversion layer includes a first light conversion material configured to emit red light under excitation of light from the light emitting element and a second light conversion material configured to emit green light under excitation of light from the light emitting element.