Backlight Sealant Recess Structure for Mini LED Shadow Reduction
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Solution Overview
Problem
Mini LED backlights face challenges in achieving a shorter optical distance (OD) while maintaining light uniformity and brightness, leading to dark shadows between adjacent LED chips due to concentrated light emission.
Innovation Solution
A backlight module with a substrate and LED chips, where a sealant layer with recesses is used to distribute light more evenly by allowing side emission, featuring recesses with specific shapes and sub-recesses to increase light refraction and reduce dark shadows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the optical distance (OD) is reduced to meet thin-type design requirements, then the thickness of the device is reduced, but the light uniformity deteriorates and dark shadows form between adjacent LED chips
Solution Approach 1:
The patent applies local quality by creating different optical path structures at different locations. Specifically, it uses a combination of direct light transmission areas and reflected light areas (formed by reflective layers or prismatic structures) within the optical distance region. This allows light to reach different areas through different paths (direct and reflected), improving overall light uniformity while maintaining a short optical distance.
Solution Approach 2:
The patent introduces dimensional changes by adding vertical layering structures (such as multi-layer reflective layers or prismatic structures with varying heights) within the optical distance region. This transforms a two-dimensional light transmission problem into a three-dimensional optical path design, allowing light to reach adjacent areas through reflected paths from different vertical levels, thereby improving light uniformity without increasing the horizontal optical distance.
2Length of stationary object
If the optical distance is kept minimal, then the device thickness is minimized, but the brightness in areas between adjacent LED chips decreases due to concentrated light emission
Solution Approach 1:
The patent introduces intermediary elements (reflective layers, prismatic structures, or light-guiding structures) within the optical distance region that act as mediators to redirect concentrated light from LED chips toward adjacent areas. These intermediaries capture light that would otherwise be concentrated directly above the LED chips and redirect it to illuminate the spaces between adjacent chips, thereby increasing brightness in those areas while maintaining a minimal optical distance.
Solution Approach 2:
The patent segments the optical distance region into multiple functional zones: direct light transmission zones, reflected light zones, and light redistribution zones. By dividing the space into these segments with different optical functions, the patent ensures that concentrated light from each LED chip is systematically redistributed to adjacent areas through reflected and redirected paths, improving brightness uniformity across the entire display area while keeping the optical distance minimal.
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 enhances brightness between LED chips by increasing side light emission, reducing the occurrence of dark shadows and improving display quality.
Implementation Method 1
A sealant layer with a plurality of recesses is provided, and the plurality of recesses are arranged above the plurality of LED chips in a one-to-one correspondence to the plurality of LED chips
Data Source
AI summary
The present application discloses a backlight module and a display device. The backlight module includes a substrate, a plurality of LED chips, and a sealant layer. The plurality of LED chips are arranged on the substrate at intervals, and the sealant layer is arranged on the substrate and covers the plurality of LED chips; the sealant layer is provided with a plurality of recesses on a side away from the LED chips, and the plurality of recesses is arranged above the plurality of LED chips in a one-to-one correspondence to the plurality of LED chips, so that light directly above the LED chips is opened to surroundings, and side light emission of the LED chips is increased, thereby increasing brightness of an area between adjacent ones of the LED chips, thus reducing a probability of dark shadows occurring.