Backlight Unit Stepped Side Housing for Mura Suppression
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Solution Overview
Problem
Existing backlight units face challenges in achieving uniform color display and implementing a thin bezel design due to issues like mura (non-uniform luminance) and increased bezel thickness, which affect the overall performance and aesthetics of display devices.
Innovation Solution
A backlight unit design featuring an optical unit with a substrate hosting multiple light-emitting devices for uniform light distribution, a cover bottom accommodating the optical unit, and a side housing that overlaps part of the optical unit's upper surface, along with a light conversion unit to suppress mura and enable a thinner bezel, is proposed. This design includes light conversion patterns and materials like titanium dioxide and phosphor-coated plastic to enhance light scattering and reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional backlight unit structure is used, then the structure is simple and easy to manufacture, but the luminance uniformity is poor and mura occurs
Solution Approach 1:
The side housing is divided into a first side housing and a second side housing that are positioned at different heights. The first side housing has a first height and the second side housing has a second height that is different from the first height. This segmentation allows different regions of the backlight unit to be controlled independently, improving luminance uniformity across the display area while maintaining a manageable structural complexity.
2Shape
If the bezel thickness is increased, then the structural stability is improved, but the aesthetic appearance and thin bezel design are compromised
Solution Approach 1:
The side housings are positioned at different vertical heights rather than uniformly distributing support across the entire bezel thickness. The first side housing is positioned at a first height and the second side housing is positioned at a second height, creating a stepped support structure. This dimensional variation allows the bezel to maintain structural stability through strategic support points while reducing the overall bezel thickness for better aesthetics.
3Manufacturing precision
If the side housing is positioned to overlap the optical unit, then the mura is suppressed and luminance uniformity is improved, but the bezel thickness increases
Solution Approach 1:
The side housings are designed with different heights to create a dynamic, stepped support structure rather than a uniform overlay. The first side housing extends to a first height and the second side housing extends to a second height, allowing the optical unit to be supported at multiple levels. This dynamic positioning suppresses mura by distributing light reflection across different heights while minimizing the maximum bezel thickness required.
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 achieves improved luminance uniformity and allows for a thinner bezel design, effectively addressing the issues of mura and bezel thickness, resulting in enhanced display performance and aesthetics.
Implementation Method 1
a plurality of light emitting devices irradiating light are disposed on a substrate
Implementation Method 2
enhance light scattering and reflection
Implementation Method 3
light conversion patterns and materials like titanium dioxide and phosphor-coated plastic
Implementation Method 4
for uniformly distributing the light emitted from the plurality of light emitting devices
Data Source
AI summary
Disclosed is a backlight unit comprising an optical unit including a substrate on which a plurality of light emitting devices for irradiating light are disposed, for uniformly distributing the light emitted from the plurality of light emitting devices, a cover bottom accommodating the optical unit, and a side housing fixed to the cover bottom and disposed to overlap at least a part of an upper surface of the optical unit. A display device using the backlight unit is also provided.