Backlight Module Light-Scattering Members Uniformity
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Solution Overview
Problem
Current direct-lit backlight modules exhibit poor uniformity in light extraction intensity, with stronger light extraction at regions vertically corresponding to light-emitting elements and weaker extraction between them, leading to non-uniform luminescence performance.
Innovation Solution
A backlight module design featuring a light-emitting substrate with light-scattering members, including convex elements, and a reflective film layer with light-exiting holes, which scatters light emitted by the light-emitting elements to enhance light intensity distribution between elements, thereby improving light extraction uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If direct-lit backlight structure is used to achieve flexibility, then flexibility is improved, but light extraction uniformity deteriorates
Solution Approach 1:
The patent introduces light-scattering members with different shapes (convex, concave, cylindrical, conical, or irregular) positioned at specific locations between light-emitting elements. These members create localized light scattering effects in regions where light intensity is otherwise weak, achieving non-uniform light distribution that compensates for the inherent non-uniformity of direct-lit backlight structures, thereby improving overall light extraction uniformity while maintaining flexibility.
2Illumination intensity
If light-scattering members are added to improve light extraction uniformity, then light extraction uniformity is improved, but device complexity increases
Solution Approach 1:
The patent integrates light-scattering members directly into the backlight module structure, combining the light scattering function with the existing light-emitting substrate and reflective film layer. This merging approach avoids adding separate, independent components, thereby improving light extraction uniformity while minimizing the increase in device complexity.
Solution Approach 2:
The patent optimizes parameters of the light-scattering members including their shape (convex, concave, cylindrical, conical, or irregular), size (5-50 micrometers in diameter), depth (5-50 micrometers), and material composition. By carefully controlling these parameters, the patent achieves effective light scattering with minimal structural additions, improving light extraction uniformity while keeping the device relatively simple.
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 enhances light intensity distribution between light-emitting elements, resulting in improved luminescence performance and uniformity of light extraction across the backlight module.
Implementation Method 1
light-scattering members disposed on the first side of the base substrate... A part of the light emitted by the light-emitting elements is reflected to the light-scattering members by the reflective film layer and is scattered by the light-scattering members
Data Source
AI summary
A backlight module and a display device are provided. The backlight module includes a light-emitting substrate and a reflective film layer disposed on a light-exiting surface of the light-emitting substrate. The light-emitting substrate includes a base substrate and light-emitting elements and light-scattering members disposed on one same surface of the base substrate. The reflective film layer includes a plurality of light-exiting holes for light passing through. A part of the light emitted by the light-emitting elements is reflected to the light-scattering members by the reflective film layer and is scattered by the light-scattering members. Therefore, light intensity of regions between the light-emitting elements is enhanced.