Light Source Module Asymmetric Groove Package Halos
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Solution Overview
Problem
Ultra-thin direct type backlight modules suffer from light beam reflections causing halo effects and non-uniform light output, which degrade display quality and contrast due to the use of reflective members or structures.
Innovation Solution
A light source module with a substrate, light emitting device, and an asymmetric package structure featuring grooves and an optical pattern, where the light emitting device is positioned at the geometric center of the first groove and the second groove is offset, with a transflective optical pattern that adjusts forward light output and deflects beams to prevent adjacent light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective member or reflective structure is provided in the package layer, then light output uniformity is improved, but a reflective dark spot is generated and overall light output uniformity is affected
Solution Approach 1:
The patent employs asymmetric groove structures within the package layer, where grooves are positioned at specific locations relative to the light emitting device but not symmetrically distributed. This asymmetric configuration allows selective reflection and transmission of light beams, preventing concentrated dark spots while maintaining overall light output uniformity across the display surface.
Solution Approach 2:
The reflective structures are implemented with locally varied properties - different groove depths, orientations, and densities at different locations within the package layer. This local quality variation enables precise control over light beam paths, allowing reflection in specific regions while permitting transmission in others, thereby eliminating uniform dark spots while preserving light output uniformity.
2Illumination intensity
If light beams are transmitted through the package layer, then light output is achieved, but multiple total reflections cause lateral transmission to adjacent light sources generating halo effect
Solution Approach 1:
The patent extracts and removes specific light beams from the transmission path by introducing grooves that intercept and redirect beams that would otherwise undergo multiple total reflections. By taking out these problematic beams early in their path through the package layer, the design prevents them from reaching adjacent light sources and creating halo effects.
Solution Approach 2:
The patent converts the potentially harmful multiple total reflections into beneficial controlled reflections by designing groove structures that deliberately redirect light beams. Instead of allowing uncontrolled lateral transmission that creates halos, the grooves guide reflections in predetermined directions that enhance light output uniformity without generating halo effects.
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
Enhances light output uniformity and reduces dark spots by deflecting light beams to increase specific region illumination while preventing transmission to adjacent light emitting devices, thereby improving display quality and contrast.
Implementation Method 1
The optical pattern is disposed in the first groove and the second groove, and is transflective
Implementation Method 2
some light beams emitted by the light emitting device still undergo multiple total reflections and are transmitted laterally
Data Source
AI summary
A light source module includes a substrate, a light emitting device, a package structure, and an optical pattern. The light emitting device and the package structure are disposed on a surface of the substrate, and the package structure covers the light emitting device. The package structure has a first groove and a second groove connected to each other. The light emitting device is located between the first grove and the substrate. The second groove is located between the first groove and the substrate. An orthogonal projection of the region occupied by the first groove on the substrate has a geometric center. The light emitting device is located at the geometric center. An orthogonal projection of the region occupied by the second groove on the substrate does not overlap the geometric center. The optical pattern is disposed in the first groove and the second groove, and is transflective.