Elliptical Dot Light Guide Plate Brightness Uniformity
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Solution Overview
Problem
Liquid crystal display (LCD) backlight modules with circular dots on light guide plates suffer from brightness uniformity issues due to even light scattering, leading to bright lines and non-uniform illumination, especially in ultra-narrow frame designs.
Innovation Solution
A light guide plate with elliptical or polygonal cross-section dots arranged on its bottom surface, which provides directional light reflection to reduce brightness at high positions and eliminate bright lines, improving brightness uniformity when used in backlight modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If circular dots are arranged on the bottom surface of the light guide plate to scatter light, then light scattering is achieved, but brightness uniformity deteriorates due to even light scattering causing bright lines
Solution Approach 1:
The patent applies asymmetry by changing the dot shape from circular to elliptical or polygonal forms. This asymmetric geometry causes non-uniform light scattering patterns that redirect excess light from bright regions to darker regions, thereby improving brightness uniformity across the display panel while eliminating the bright line defect caused by symmetric circular dot scattering.
2Illumination intensity
If circular dots are used for light scattering, then manufacturing is simple, but brightness uniformity deteriorates due to even distribution of light
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the dots - specifically changing from circular geometry to elliptical or polygonal geometry with specific aspect ratios and orientations. This parameter change transforms the light scattering characteristics from uniform to directional, improving brightness uniformity while maintaining manufacturing feasibility through standard dotting machine capabilities.
3Illumination intensity
If even light scattering is achieved with circular dots, then light distribution is uniform, but bright lines are generated reducing display quality
Solution Approach 1:
The patent applies the 'blessing in disguise' principle by converting the harmful effect of concentrated light at certain positions into a beneficial directional scattering pattern. The elliptical and polygonal dot shapes are designed to redirect excess light from bright regions toward darker regions, transforming the problem of localized light concentration into a solution that balances overall illumination and eliminates bright lines.
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 elliptical or polygonal cross-section dots enhance light directionality, effectively reducing bright lines and achieving improved brightness uniformity in LCD backlight modules, enhancing the overall display quality.
Implementation Method 1
The elliptical or polygonal cross-section dots enhance light directionality, effectively reducing bright lines and achieving improved brightness uniformity in LCD backlight modules
Data Source
AI summary
The embodiments of the disclosure provide a light guide plate, a backlight module, a display device, a dotting machine and a control method thereof, related to the field of display technology, which can improve the brightness uniformity of the backlight module. The light guide plate includes a light exit surface, a bottom surface opposite to the light exit surface, and a light entrance surface intersecting with the light exit surface and the bottom surface. A plurality of dots are arranged at an outer side of the bottom surface; a shape of a cross section of each dot is an ellipse or a polygon, and the cross section is parallel to the bottom surface.