Backlight Unit Diffusion Pattern for Luminance Uniformity
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Solution Overview
Problem
Conventional backlight units suffer from non-uniform luminance distribution due to bright lines and dark lines at the interfaces between light guide plates, which deteriorate the quality of displayed video.
Innovation Solution
The proposed solution involves a backlight unit with a plurality of optical assemblies, each comprising a light source, a light guide plate with a diffusion pattern at its interfaces, and a diffusion plate with a reinforced diffusion pattern to minimize non-uniformity, ensuring uniform light distribution across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light guide plates are used to guide light in backlight units, then light distribution is improved, but non-uniform luminance with bright and dark lines appears at interfaces between light guide plates
Solution Approach 1:
The patent applies local quality by placing diffusion patterns specifically at the interface regions between light guide plates where non-uniformity occurs. The diffusion plate has different optical properties at different locations: the interface portions contain diffusion patterns to scatter light and eliminate bright/dark lines, while other portions maintain their original light-guiding properties. This localized modification resolves the luminance uniformity problem without compromising the overall light distribution function.
2Manufacturing precision
If diffusion patterns are added to light guide plate interfaces, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent merges the diffusion function with the light guide plate structure by integrating diffusion patterns directly into the diffusion plate that is already part of the optical assembly. Rather than adding separate diffusion elements, the diffusion functionality is combined with the existing diffusion plate component, eliminating the need for additional parts while achieving luminance uniformity.
3Area of stationary object
If multiple optical assemblies are used to cover large display areas, then display area is improved, but non-uniformity at assembly interfaces increases
Solution Approach 1:
The patent addresses interface non-uniformity in multi-assembly configurations by applying diffusion patterns specifically at the interface portions of the diffusion plate where optical assemblies meet. This localized diffusion treatment compensates for the discontinuities created by multiple assemblies, ensuring uniform luminance across the entire large display area while maintaining the modular multi-assembly structure.
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 enhances the uniformity of light emission, improves image quality by increasing the color contrast ratio, and allows for independent adjustment of luminance in different regions, reducing power consumption and manufacturing costs while simplifying the assembly process.
Implementation Method 1
a light guide plate having a first part through which light travels inside and a second part diffusing upward the light traveling inside through the first part
Implementation Method 2
a diffusion pattern selectively disposed at the portions corresponding to interfaces between the light guide plates on the optical assemblies
Data Source
AI summary
A backlight unit according to an embodiment includes: a plurality of optical assemblies each including a light source generating light, a light guide plate having a first part through which light travels inside and a second part diffusing upward the light traveling inside through the first part; and a diffusion pattern selectively disposed at the portions corresponding to interfaces between the light guide plates on the optical assemblies.