Optical Sheet Prism Diffusion Backlight Hot Spots
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Solution Overview
Problem
In edge-illumination type backlight assemblies, light-leakage and hot spots occur around light sources due to the use of optical sheets, leading to non-uniform luminance distribution and increased manufacturing complexity.
Innovation Solution
An optical sheet with a base film featuring a prism pattern on one area and a diffusion member, including a lens pattern, is used to scatter light and reduce light-leakage and hot spots, eliminating the need for additional prism sheets, thereby simplifying manufacturing and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If optical sheets including diffusion sheet and prism sheets are used in edge-illumination type backlight assembly, then luminance uniformity is improved, but light-leakage and hot spots occur around light sources
Solution Approach 1:
The optical sheet is divided into multiple regions with different optical properties: a first region closer to the light source with higher diffusion capability to reduce hot spots, and a second region farther from the light source with different optical characteristics. This spatial variation in optical properties allows simultaneous reduction of light-leakage and hot spots while maintaining luminance uniformity across the display panel.
2Illumination intensity
If multiple optical sheets (diffusion sheet and prism sheets) are used, then light distribution is improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
Multiple optical functions (diffusion, light guiding, and luminance uniformity control) that were previously achieved by stacking separate diffusion sheets and prism sheets are integrated into a single optical sheet. This merged structure reduces the total number of components, simplifies assembly, and lowers manufacturing complexity while maintaining effective light distribution.
Solution Approach 2:
The optical sheet performs multiple optical functions simultaneously: it diffuses light to reduce hot spots, guides light from the edge-mounted light source, and controls luminance distribution across the display panel. This multi-functional design eliminates the need for separate specialized sheets, reducing device 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 sheet effectively directs light from the source to the display panel, reducing luminance differences and eliminating hot spots, resulting in improved luminance uniformity and reduced manufacturing complexity and costs.
Implementation Method 1
a diffusion member having a plurality of scattering members within the base film configured to scatter incident light
Implementation Method 2
a prism pattern formed on a light-exiting surface in a first area of the base film, wherein the prism pattern has a plurality of prisms
Data Source
AI summary
An optical sheet includes a base film, a prism pattern formed in a first area of the base film, and a diffusion member formed in a second area of the base film. The prism pattern has a plurality of parallel prisms on a light-exiting surface. The diffusion member includes a plurality of scatter members in the base film to scatter light, or a plurality of irregularly arranged lenses on one or more of the light-incident surface and the light-exiting surface.