Rectangular LED Light Guide for Uniform Backlight
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Solution Overview
Problem
Existing LED direct back-light units suffer from uneven light distribution and light leakage issues due to the round shape of LED lenses, leading to MURA effects and inefficient light utilization, especially in HDR mode, causing light uniformity problems across local dimming areas and edges.
Innovation Solution
A light emitting module with a cubic shape light emitting structure array, featuring a substrate, divider, and light guide element with convex and concave sections, and a lateral light reflecting layer to scatter and redirect light for uniform distribution, and a bottom light reflecting layer to enhance light reflection and absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a round-shaped LED lens is used, then the LED structure is simple and easy to manufacture, but light distribution becomes uneven causing MURA effects and light leakage between local dimming areas
Solution Approach 1:
The LED lens is divided into multiple independent light guiding matrix elements, each with a rectangular shape matching the local dimming area. This segmentation allows each element to be optimized independently for uniform light distribution while maintaining overall manufacturing simplicity through modular assembly.
Solution Approach 2:
The patent transitions from a symmetric round lens shape to an asymmetric rectangular lens shape that matches the local dimming area geometry. This asymmetry eliminates the MURA effect by ensuring uniform light distribution across different orientations and positions of the LED array.
2Device complexity
If a round LED lens is used, then the structure is simple, but light leaking effect occurs at the boundaries of local dimming areas interfering with neighboring areas
Solution Approach 1:
The lens is segmented into multiple rectangular light guiding matrix elements that precisely match the boundaries of local dimming areas. This segmentation prevents light from leaking between adjacent elements by creating distinct optical boundaries that confine light to specific regions.
Solution Approach 2:
The patent converts the potential harm of light spreading into a benefit by using the rectangular geometry to create precise light confinement. The edges of the rectangular lenses are designed to redirect light away from boundaries, transforming what would be a leakage problem into an effective light control mechanism.
3Ease of manufacture
If a round LED lens is used, then manufacturing is easier, but uneven light effect occurs at the four edge sides and corners of the backlight module
Solution Approach 1:
Each rectangular light guiding matrix element is designed with specific local optical properties that address the lighting requirements of its corresponding local dimming area. The rectangular geometry provides uniform light distribution locally, and the array of these elements collectively achieves uniform illumination across the entire backlight module including edges and corners.
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 balanced light distribution, reduces hot-spot and hollow effects, and improves light efficiency, resulting in high luminous uniformity, high color performance, and minimized module thickness, suitable for HDR and local dimming applications.
Implementation Method 1
a light guide element with convex and concave sections, and a lateral light reflecting layer to scatter and redirect light for uniform distribution
Implementation Method 2
a lateral light reflecting layer to scatter and redirect light for uniform distribution
Implementation Method 3
a bottom light reflecting layer to enhance light reflection and absorption
Data Source
AI summary
A light emitting structure has a substrate, a divider, a light guide element and a light emitting element. The divider is connected with the substrate and erected from the substrate. The light guide element is connected with the divider. The divider is positioned in between the substrate and the light guide element. A chamber is delineated by the substrate, the divider and the light guide element. The light emitting element is mounted onto the substrate, surrounded by the divider, accommodated within the chamber and transparent. The light guide element has an external surface, an internal surface and a convex section and/or a concave section. The external surface and the internal surface are oppositely positioned to each other. The external surface faces away from the substrate. The internal surface faces towards the substrate. The convex section and/or the concave section is formed on the external surface and/or the internal surface.