Prism Light Pipe Uniform Brightness Control
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Solution Overview
Problem
Conventional light pipes face challenges in achieving uniform brightness across their longitudinal direction due to difficulties in controlling light transmission and emission, leading to inefficient distribution of light.
Innovation Solution
A light pipe with an optical film featuring a plurality of prisms, rolled to have a cavity along its longitudinal direction, and a supporter surrounding the film, where the side surface of the prisms has a maximum surface roughness of about 600 nm to 1.5 □, enhancing light transmission and emission while maintaining uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light pipes are used, then light transmission is achieved, but uniform brightness across the longitudinal direction cannot be achieved
Solution Approach 1:
The patent applies local quality by creating prisms with specific surface roughness characteristics (600-1500 nm) at particular locations along the light pipe. The optical film includes regions with different surface properties - smooth regions for light transmission and rough prism regions for light scattering and uniformity control. This localized modification of surface quality enables precise control over light distribution without compromising overall transmission efficiency.
Solution Approach 2:
The patent utilizes parameter changes by controlling the surface roughness parameter of the prism structures within a specific range (600-1500 nm). This parameter optimization balances two competing requirements: sufficient roughness to scatter light and achieve uniform brightness, but not so much as to excessive transmit light loss. The cavity structure and prism dimensions are also optimized parameters to achieve the desired light distribution pattern.
2Area of stationary object
If light transmission is enhanced, then illumination coverage is improved, but transmission loss increases
Solution Approach 1:
The patent segments the optical film into multiple functional regions: smooth transmission regions and rough prism regions. The prisms are distributed along the longitudinal direction to create multiple light scattering events, which expands illumination coverage. Each prism segment contributes to light distribution while the overall structure maintains efficient transmission by avoiding excessive scattering in any single location.
Solution Approach 2:
The patent introduces a dimensional approach by forming three-dimensional prism structures on the optical film surface. These prisms extend in the longitudinal direction and create light paths in multiple dimensions, enabling light to reach wider areas. The cavity structure provides additional spatial dimension for light propagation, allowing the light pipe to illuminate larger volumes without significant transmission loss.
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 effectively transmits light with minimal loss, achieving uniform brightness and improved optical transmittance across the light pipe, allowing for efficient illumination over a wide area.
Implementation Method 1
an optical film including a plurality of prisms whose surface roughness falls within a predetermined range
Implementation Method 2
Light that transmits through a light pipe may be distributed to the outside of the light pipe
Implementation Method 3
a side surface of one of the prisms has a maximum surface roughness of about 600 nm to about 1.5 μm
Data Source
AI summary
A light pipe and an illuminating device having the light pipe are provided. The light pipe includes an optical film including a plurality of prisms and being rolled to have a cavity extending along a longitudinal direction of the prisms; and a supporter surrounding the optical film having the cavity, wherein a side surface of one of the prisms has the maximum surface roughness of about 600 nm to about 1.5 □. Accordingly, it is possible to emit a light toward a distant area through the diffraction of light and thus to provide uniform luminance.