Optical Thin Film Dual-Layer Scattering for Backlight Efficiency
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Solution Overview
Problem
Conventional edge-type backlight modules suffer from reduced lighting efficiency due to the inability to collect scattered light with incident angles outside the range of −40° to 60°, resulting in wasted light projection capabilities.
Innovation Solution
An optical thin film comprising a transparent substrate with a first light-condensing layer having a haze value of 5% to 30% and surface roughness of 0.1 RMS to 1 RMS, and a second light-condensing layer with a haze value of 70% to 100% and surface roughness of 1 RMS to 10 RMS, is integrated into the backlight module to scatter light within the collectable range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional prism sheets are used to collect light, then light within the incident angle range of −40° to 60° can be collected, but scattered light with incident angles outside this range cannot be collected, resulting in decreased lighting efficiency
Solution Approach 1:
The optical thin film is segmented into multiple functional layers: a first light-condensing layer with low haze (5-30%) for collecting light within the −40° to 60° angle range, and a second light-condensing layer with high haze (70-100%) for scattering and collecting light at wider incident angles. This segmentation allows each layer to specialize in different angular ranges, thereby improving overall lighting efficiency while expanding the effective light collection range.
Solution Approach 2:
The patent employs a composite optical thin film structure combining materials with different optical properties. The first light-condensing layer uses material with low haze value for directional light collection, while the second light-condensing layer uses material with high haze value for omnidirectional scattering. This composite structure enables the system to handle both narrow-angle and wide-angle incident light effectively, resolving the contradiction between lighting efficiency and angular adaptability.
2Illumination intensity
If a single light-condensing layer is used, then the structure is simple, but it cannot effectively scatter light across all necessary viewing angles, reducing luminance uniformity
Solution Approach 1:
The optical thin film is divided into two distinct light-condensing layers, each with specific haze values and surface roughness parameters. The first layer (haze 5-30%, roughness 0.1-1 RMS) handles primary light collection, while the second layer (haze 70-100%, roughness 1-10 RMS) handles secondary scattering. This segmentation achieves superior luminance uniformity across viewing angles while maintaining reasonable structural complexity through functional specialization.
Solution Approach 2:
Different regions of the optical thin film structure are assigned different optical properties: the first light-condensing layer has low haze and fine surface roughness for precise light direction control, while the second layer has high haze and coarse surface roughness for broad-angle scattering. This local quality differentiation enables each layer to optimize its function, achieving high luminance uniformity without excessive overall complexity.
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 optical thin film effectively scatters light to be collected by the prism sheets, enhancing lighting efficiency by increasing luminance across various viewing angles, thereby improving the overall performance of the backlight module.
Implementation Method 1
a first light-condensing layer formed on the first surface of the transparent substrate and having a haze value ranging from 5% to 30% and a surface roughness ranging from 0.1 RMS to 1 RMS
Implementation Method 2
a second light-condensing layer formed on the second surface of the transparent substrate and having a haze value ranging from 70% to 100% and a surface roughness ranging from 1 RMS to 10 RMS
Data Source
AI summary
An optical thin film includes: a transparent substrate including a first surface and a second surface which is opposite to the first surface; a first light-condensing layer formed on the first surface of the transparent substrate, the first light-condensing layer having a haze value ranging from 5% to 30% and a surface roughness ranging from 0.1 RMS to 1 RMS; and a second light-condensing layer formed on the second surface of the transparent substrate. The second light-condensing layer has a haze value ranging from 70% to 100% and a surface roughness ranging from 1 RMS to 10 RMS.