Multilayer Light-Guiding Diffuser Plate for Uniform Backlight Homogeneity
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Solution Overview
Problem
Conventional diffuser plates for backlight units in flat panel displays face a trade-off between high brightness and homogeneous light distribution, with existing surface structures either compromising on transmission or achieving limited homogeneity, especially in large lamp interspacings and thin assemblies.
Innovation Solution
A planar moulded article with light-guiding structures featuring a combination of lens and compound parabolic concentrator (CPC) regions, designed to be translation invariant and described by specific mathematical parameters, including aperture angles and polynomial closures, which optimize light distribution and homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional diffuser plates with scattering pigments are used, then light scattering and homogenisation are improved, but light transmission decreases from 90% to 50-70%
Solution Approach 1:
The diffuser plate is segmented into multiple functional layers: a first diffuser layer with scattering particles for light homogenisation, and a second diffuser layer with light-guiding surface structures (barrel-shaped or prism-shaped ridges) for light redistribution. This segmentation allows each layer to perform its specific function optimally while maintaining high overall transmission.
Solution Approach 2:
Different regions of the diffuser plate have different properties: the first diffuser layer contains scattering particles concentrated at specific locations to create local homogenisation zones, while the second diffuser layer has surface structures with specific geometries (barrel-shaped or prism-shaped ridges) that locally redirect light to achieve uniform overall distribution without compromising transmission.
2Loss of energy
If simple barrel-shaped or prism-shaped ridge structures are used for homogenisation, then light transmission and brightness are improved, but achievable homogeneity is limited and less than conventional diffuser plates
Solution Approach 1:
The invention merges two different homogenisation mechanisms into a single integrated diffuser plate: volume scattering by particles within the first diffuser layer, and surface reflection/refraction by barrel-shaped or prism-shaped ridges in the second diffuser layer. This combination achieves superior homogeneity compared to either mechanism alone, while maintaining high transmission.
Solution Approach 2:
The diffuser plate uses composite structures with scattering particles embedded in a transparent matrix material. The first diffuser layer combines scattering particles with the base material, while the second diffuser layer incorporates surface-relief structures (barrel-shaped or prism-shaped ridges) into the transparent substrate, creating a composite material system that achieves both high transmission and excellent homogeneity.
3Stability of the object's composition
If complicated multilayer structures are used to achieve sufficient homogeneity for demanding BLU structures, then homogeneity is improved, but device complexity and cost increase
Solution Approach 1:
The invention extracts and integrates the essential homogenisation functions into a single diffuser plate with two strategically designed layers, eliminating the need for multiple separate homogenisation components in the backlight unit. The first diffuser layer handles initial light scattering, while the second diffuser layer with surface structures completes the homogenisation, reducing overall system complexity.
Solution Approach 2:
The second diffuser layer with barrel-shaped or prism-shaped ridge structures serves multiple functions: it redistributes light to achieve homogeneity, maintains high transmission, and works synergistically with the first diffuser layer. This multi-functional design reduces the need for additional separate components, simplifying the overall BLU structure.
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 a high and uniform brightness distribution across the backlight unit, minimizing brightness variations and enhancing homogeneity, even in demanding configurations with fewer lamps and thinner assemblies, while maintaining high transmission.
Implementation Method 1
the front side comprises light-guiding structures consisting of a lens region and a convex CPC (compound parabolic concentrator) region
Implementation Method 2
light-guiding structures consisting of a lens region and a convex CPC (compound parabolic concentrator) region
Data Source
AI summary
The present invention relates to a multilayer, surface structured solid plate for light guidance, the base material of which consists of a transparent plastic material, and optionally one or more cover layers.