Backlight Module Layout for Uniform Edge Brightness
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Solution Overview
Problem
Backlight modules using Micro LEDs or Mini LEDs suffer from insufficient brightness at edge areas, resulting in dark edges due to uneven light distribution, which affects the overall quality of display devices.
Innovation Solution
A backlight module design with a central light-emitting area and an edge light-emitting area, where the distance between light-emitting units in the edge area is less than in the central area, optimizing light energy distribution to enhance edge brightness, featuring specific geometric arrangements of light-emitting units and shapes to ensure uniformity and improved luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light-emitting units are uniformly distributed across the backlight module, then the structure is simple and easy to manufacture, but the brightness at edge areas is insufficient resulting in dark edges
Solution Approach 1:
The patent applies local quality by dividing the backlight module into a central light-emitting area and an edge light-emitting area, with different light-emitting unit densities in each region. Specifically, the edge light-emitting area has a smaller pitch between adjacent light-emitting units compared to the central area, creating locally optimized light distribution that compensates for edge brightness deficiency while maintaining overall structural feasibility
2Illumination intensity
If light-emitting units are densely arranged at edge areas to improve brightness, then edge brightness is enhanced, but the device complexity increases due to non-uniform distribution
Solution Approach 1:
The patent segments the backlight module into distinct functional zones: a central light-emitting area with a first pitch and an edge light-emitting area with a second pitch. This segmentation allows independent optimization of each region's light-emitting unit density, enabling enhanced edge brightness through the smaller second pitch while maintaining manufacturing feasibility through the larger first pitch in the central area, thus managing device complexity
3Illumination intensity
If the distance between adjacent light-emitting units is reduced at edge areas, then luminous energy at edges is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent implements local quality by specifying different pitch values for different regions: the central light-emitting area uses a first pitch that is easier to manufacture, while the edge light-emitting area uses a smaller second pitch to improve luminous energy. This localized approach concentrates the manufacturing precision requirements specifically to the edge areas where they are most needed, rather than requiring high precision across the entire module
Data Source
AI summary
The present disclosure discloses a backlight module, a display module, and a splicing display device. The backlight module includes a central light-emitting area and an edge light-emitting area disposed at a side of the central light-emitting area along a first direction; the central light-emitting area is provided with a plurality of first light-emitting units, and the edge light-emitting area is provided with a plurality of second light-emitting units; a direction from a center to an edge of the backlight module is defined as the first direction, and a distance between adjacent two first light-emitting units is greater than a distance between adjacent two second light-emitting units in the first direction.