Optical Sheet Micro Structures Narrow Light Angle
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Solution Overview
Problem
Conventional backlight modules suffer from non-homogenized light distribution and wide light-emitting angles, requiring additional structures like V-shape grooves to narrow the light-emitting angle, which complicates the design and leads to uneven luminosity.
Innovation Solution
An optical sheet with a transparent base featuring first micro structures, such as lenticular lenses, on the light-exit surface and second micro structures, like triangular prisms, on the light-receiving surface, which work together to narrow light-emitting angles and improve light uniformity by total reflection and deflection mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reverse prism sheet with rough surface structures is used, then light distribution is improved, but light-emitting angle becomes too wide
Solution Approach 1:
The optical sheet is divided into two distinct functional layers: first micro structures (lenticular lenses) on the light-exit surface for controlling light emission angle, and second micro structures (prisms) on the light-receiving surface for total reflection and light mixing. This segmentation allows each layer to independently optimize its function without interfering with the other.
Solution Approach 2:
The patent combines two different micro structure types (lenticular lenses and prisms) into a single integrated optical sheet, merging the light-emitting angle control function with the light mixing function in one component, eliminating the need for separate V-shape grooves.
2Shape
If V-shape grooves are added to narrow light-emitting angle, then light direction is improved, but device complexity increases
Solution Approach 1:
The invention extracts the light-emitting angle control function from the complex V-shape groove structure and implements it through simple lenticular lenses on the light-exit surface, maintaining the desired optical effect while eliminating structural complexity.
Solution Approach 2:
The patent replaces the mechanical V-shape groove structure with optical micro structures (lenticular lenses and prisms) that achieve the same light direction control through optical principles rather than mechanical geometry, simplifying the overall device design.
3Shape
If micro structures are added to control light, then light direction is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses standard lenticular lens and prism geometries with well-defined parameters that can be manufactured using conventional optical molding techniques. The micro structures are designed with practical dimensional parameters that balance optical performance with manufacturability.
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 narrows light-emitting angles in both planes, reduces bright spots, and enhances luminous uniformity by mixing incoming light rays, eliminating the need for complex V-shape grooves and improving light distribution.
Implementation Method 1
Each of the second micro structures corresponds to one of the first micro structures and includes a second planar surface formed on the light-receiving surface and a total reflection surface connected with the second planar surface
Implementation Method 2
Each of the first micro structures includes a first planar surface formed on the light-exit surface and a curve surface opposite the first planar surface
Data Source
AI summary
An optical sheet includes a transparent base, a plurality of first micro structures, and a plurality of second micro structures. The transparent base has a light-receiving surface and a light-exit surface. The first micro structures are disposed on the light-exit surface, and the second micro structures are disposed on the light-receiving surface. Each first micro structure includes a first planar surface and a curve surface. Each second micro structure includes a second planar surface formed on the light-receiving surface and a total reflection surface connected with the second planar surface. Each first micro structure forms a first orthogonal projection area on the light-receiving surface, each second micro structure forms a second orthogonal projection area on the light-receiving surface, the second planar surface is located within the first orthogonal projection area, and the entire area of the second planar surface is equal to the second orthogonal projection area.