Backlight Unit Sidewall Light Source Mounting
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Solution Overview
Problem
Conventional backlight units for liquid crystal display devices often result in dark areas due to the design of the bezel, which can be difficult to minimize without expanding the bezel width, and may lead to instability and reduced heat discharge efficiency of the light sources.
Innovation Solution
A backlight unit design featuring a circuit board with light sources mounted on sidewall portions that extend in different directions, forming obtuse angles, which reduces dark areas and enhances stability and heat discharge, while maintaining a narrow bezel width by overlapping the circuit board with the non-display area and using an extrusion bar for heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the bezel width is reduced to minimize dark areas, then the display area coverage is improved, but the stability and heat discharge efficiency of the light sources deteriorates
Solution Approach 1:
The light sources are mounted on the sidewall portions of the circuit board rather than only on the bottom portion, utilizing the vertical dimension to distribute light sources away from the bezel area. This allows reduced bezel width while maintaining light source stability and heat discharge efficiency through spatial redistribution.
Solution Approach 2:
The circuit board is divided into multiple portions (first bottom portion, second bottom portion, first sidewall portion, second sidewall portion) with light sources distributed on different segments. This segmentation allows strategic placement of light sources to avoid bezel areas while maintaining structural stability and heat management.
2Illumination intensity
If the bezel width is reduced to minimize dark areas, then the display area coverage is improved, but the heat discharge efficiency of the light sources deteriorates
Solution Approach 1:
By mounting light sources on sidewall portions extending vertically from the bottom portion, the design creates additional heat dissipation pathways through the vertical dimension. The sidewall portions act as heat conduction paths to the bottom chassis, improving heat discharge efficiency while enabling narrower bezel width.
3Device complexity
If light sources are mounted on the bottom portion only, then the structure is simple, but dark areas occur in the display area
Solution Approach 1:
The circuit board is segmented into multiple functional portions (bottom portions and sidewall portions) with light sources distributed across different segments. This segmentation enables comprehensive light coverage across the display area while maintaining reasonable structural complexity through modular design.
Solution Approach 2:
The design transitions from a single-plane (bottom portion only) light source arrangement to a multi-dimensional arrangement by adding sidewall portions. This dimensional expansion improves light distribution uniformity across the display area without proportionally increasing structural complexity.
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 effectively reduces dark areas in the display area, improves the stability and reliability of the light source unit, and maintains a narrow bezel width by optimizing the placement and angle of light sources on the sidewall portions, enhancing the overall performance and efficiency of the backlight unit.
Implementation Method 1
The first light source may include a plurality of first light emitting diodes, and the second light source may include a plurality of second light emitting diodes
Implementation Method 2
using an extrusion bar for heat dissipation
Data Source
AI summary
A display apparatus includes a display panel which displays an image with light and a backlight unit which provides the light to the display panel. The backlight unit includes a first light source, a second light source and a circuit board. The circuit board includes in a top plan view, a first edge lengthwise extending parallel to a first direction and a second edge lengthwise extending parallel to a second direction crossing the first direction, and a sidewall portion extending from the bottom portion. In a third direction crossing the first and second directions, the sidewall portion includes first and second sidewall portions respectively extending from the first and second edges, and on which the first and second light sources are mounted.