Light Diffusion Device With Wound Scattering Patterns
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Solution Overview
Problem
Conventional light diffusers in backlight modules for LCDs fail to produce a uniform and sufficiently bright surface light source, necessitating additional optical films that increase fabrication costs and module thickness.
Innovation Solution
A light diffusion device with a light exit surface featuring continuous, wound light scattering patterns that overlap, enhancing light distribution and brightness without the need for multiple optical films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light diffusers (surface roughened, added with diffusing particles) are used to achieve uniform light diffusion, then light uniformity is improved, but brightness is reduced and additional optical films are required
Solution Approach 1:
The patent applies curved/refractive surface patterns (concave or convex structures) on the light diffuser surface instead of conventional roughening or particle addition. These curved patterns refract light to achieve uniform diffusion while maintaining brightness, eliminating the need for additional optical films and reducing fabrication costs.
Solution Approach 2:
The patent changes the surface geometry parameters by introducing specific curved pattern profiles (depth, width, spacing) on the light diffuser. By optimizing these geometric parameters, the device achieves both uniform light distribution and high brightness output, resolving the contradiction between uniformity and brightness.
2Illumination intensity
If multiple optical films are added to enhance brightness, then light output quality is improved, but fabrication cost and module thickness increase
Solution Approach 1:
The light diffuser is designed to perform multiple functions simultaneously: it diffuses light uniformly, enhances brightness through refractive curved patterns, and eliminates the need for separate optical films. This multi-functionality reduces both the number of components and overall module thickness.
Solution Approach 2:
The patent merges the functions of light diffusion and brightness enhancement into a single integrated light diffuser component with curved surface patterns. This consolidation eliminates the need for separate optical films, thereby reducing module thickness and fabrication cost.
3Illumination intensity
If conventional light diffusers are used, then light diffusion is achieved, but concentrated light pattern cannot be formed and brightness is insufficient
Solution Approach 1:
The curved/refractive surface patterns on the light diffuser are specifically designed to concentrate and shape light into desired patterns while maintaining high brightness. The geometric curvature of the patterns controls light refraction to achieve both concentration and uniformity simultaneously.
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 provides a uniform and brighter light output, reducing the number of optical films required, lowering fabrication costs and module thickness while maintaining high display quality, aligning with the 'light, thin, short, and small' design requirements.
Implementation Method 1
The light exit surface has at least one light scattering pattern. A trajectory of the light scattering pattern is a continuous curve. The continuous curve is winded to form a plurality of closed patterns in sequence on the light exit surface
Data Source
AI summary
A light diffusion device including a light incident surface and a light exit surface is provided. The light exit surface has at least one light scattering pattern. A trajectory of the light scattering pattern is a continuous curve. The continuous curve is winded to form a plurality of closed patterns in sequence on the light exit surface, and two adjacent closed patterns at least overlap partly.