Mini LED Backlight Module with Gradient Hollow-Carved Ink Layer
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Solution Overview
Problem
Mini LED backlight modules experience uneven brightness due to IR drop as the distance of wirings increases, resulting in higher brightness near the power inlet and lower brightness away from it, leading to an uneven display effect.
Innovation Solution
A backlight module with a substrate featuring a hollow-carved ink layer and optical film with dot structures, where the hollow-carved units are arranged in a gradient to reduce light emissivity and reflectivity, and the ink layer is formed by mixing white ink and metal oxide, enhancing light transmittance and utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single aspect current injection is used in mini LED backlight modules, then the device complexity is reduced, but the brightness uniformity deteriorates due to IR drop
Solution Approach 1:
The patent applies local quality by creating different hollow-carved unit structures in different regions of the ink layer. The first region (near power inlet) has different hollow-carved unit characteristics than the second region (away from power inlet), allowing each region to compensate for its specific IR drop conditions and achieve uniform brightness across the entire backlight module.
2Illumination intensity
If the number of partitions is increased to improve contrast ratio, then the contrast ratio improves, but the halo effect worsens
Solution Approach 1:
The patent changes physical parameters of the hollow-carved units including their size, shape, distribution density, and depth in different regions. By adjusting these parameters, the light reflection and diffusion characteristics are optimized to reduce halo effects while maintaining high contrast ratio through the mini LED partition structure.
3Area of stationary object
If wiring distance is increased to cover larger display areas, then the display area is expanded, but the brightness uniformity worsens due to increased IR drop
Solution Approach 1:
The patent implements local quality by designing region-specific hollow-carved unit structures that account for the varying current distribution across large display areas. The first region near the power inlet uses different hollow-carved unit characteristics compared to the second region, compensating for the cumulative IR drop effect and maintaining brightness uniformity across the expanded display area.
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 uniform light emission across the display surface by reducing light reflectance at intense positions and increasing it at weak positions, thereby addressing the issue of uneven brightness and improving light utilization.
Implementation Method 1
the hollow-carved units are arranged in a gradient to reduce light emissivity and reflectivity
Implementation Method 2
the hollow-carved units are arranged in a gradient to reduce light emissivity
Implementation Method 3
the optical film is disposed on the light-emitting units, and is used for transmitting light emitted by the light-emitting unit
Implementation Method 4
a reflectance of light at a light intense position is less than a reflectance of the light at a light weak position
Data Source
AI summary
The present invention provides a display device and a backlight module. The backlight module includes a substrate, an ink layer, and a plurality of light-emitting units, wherein the substrate includes a first end and a second end oppositely arranged, the ink layer is disposed on the substrate, the ink layer includes a plurality of hollow-carved units arranged gradually from the first end to the second end, and at least two light-emitting units are disposed on the ink layer in an array arrangement.