Backlight Unit Light Source Array Asymmetry
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Solution Overview
Problem
Conventional backlight units for liquid crystal display panels face challenges in providing uniform luminance and reducing hot spots, as existing configurations often result in non-uniform light distribution and increased luminance in specific areas due to the arrangement of light sources.
Innovation Solution
The proposed solution involves an array of light source devices, including LEDs, arranged on a substrate with specific spacing and orientation to emit light in different directions, combined with a reflection layer to diffuse and reflect light uniformly across the display panel, ensuring even illumination and minimizing hot spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light sources are arranged in conventional configurations, then the backlight unit can be manufactured with simple structure, but non-uniform light distribution and hot spots occur
Solution Approach 1:
The light sources are divided into multiple arrays with different orientations. First light source devices emit light in a first direction while second light source devices emit light in a second direction, segmenting the illumination function to achieve uniform luminance distribution across the display panel
Solution Approach 2:
The patent employs asymmetric arrangement of light source arrays where the first and second light source devices are spaced apart by specific distances (first distance and second distance) that are not equal, creating an asymmetric configuration that compensates for hot spots and achieves uniform illumination
2Illumination intensity
If light sources are positioned closer together to increase coverage, then the display area is illuminated more uniformly, but luminance in specific areas increases creating hot spots
Solution Approach 1:
Different regions of the substrate are assigned different light source configurations. First light source devices are positioned at specific locations emitting in a first direction while second light source devices are positioned at different locations emitting in a second direction, with the spacing between them (second distance) being equal to or greater than the spacing within arrays (first distance), creating locally optimized illumination patterns that prevent hot spots
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
This configuration achieves uniform luminance across the display panel by optimizing light source placement and using a reflection layer to distribute light effectively, reducing hot spots and enhancing the overall display quality.
Implementation Method 1
a reflection layer configured to reflect the light emitted from the first and second light source devices
Data Source
AI summary
A backlight unit and display device are discussed. According to an embodiment, a light generating device includes an array of light source devices disposed on a substrate and including first and second light source devices forming a first line, the first and second light source devices spaced apart from each other with a first distance and configured to emit light in a first direction; another array of light source devices disposed on the substrate and including third and fourth light source devices forming a second line, the third and fourth light source devices spaced apart from each other with a third distance and configured to emit light in a second direction which is different from the first direction, the second line being spaced apart from the first line so that the first light source device is spaced apart from the third light source device with a second distance therebetween.