Faceted Microstructured Surface for Display Brightness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display systems, such as LCDs, face challenges in achieving uniform brightness and efficient light collimation due to limitations in the distribution and orientation of microstructured surfaces in backlight films.
Innovation Solution
An optical film with a microstructured surface featuring randomly distributed prismatic structures, including flat facets at specific polar and azimuthal angles, is developed. This surface distribution approximates the optical transmission properties of aggregate conical prismatic structures, ensuring uniform azimuthal and concentrated polar light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional microstructured surfaces are used in backlight films, then light transmission can be achieved, but brightness uniformity and collimation efficiency are insufficient
Solution Approach 1:
The patent applies local quality by creating microstructured surfaces with specifically controlled local geometries (prismatic, conical, or pyramidal structures) that have particular slope angles. These local structural features are designed to redirect light at specific angles, thereby achieving both brightness uniformity across the display surface and efficient collimation in the vertical direction. The local geometric variations are optimized to simultaneously improve both illumination intensity and collimation efficiency.
2Reliability
If microstructured surfaces with specific slope angles are used, then light collimation is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs parameter changes by systematically varying geometric parameters (slope angles, structure heights, base diameters) of the microstructured surfaces to optimize collimation performance. By adjusting these parameters within specific ranges, the patent achieves efficient light collimation while maintaining compatibility with existing manufacturing processes. The parameter optimization allows for improved collimation efficiency without proportionally increasing manufacturing complexity.
3Reliability
If aggregate conical prismatic structures are used, then optical transmission properties are optimized, but surface structure complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the complex aggregate conical prismatic structure into simpler individual elements (conical, prismatic, or pyramidal microstructures) that can be independently manufactured and then assembled or formed into the desired aggregate configuration. This segmentation approach allows for optimized optical transmission properties while reducing the complexity of individual surface features that need to be manufactured.
Solution Approach 2:
The patent utilizes composite materials by combining different microstructural geometries (conical, prismatic, pyramidal structures) within the same optical film layer. These composite microstructures work together to achieve the desired optical transmission properties, including both collimation and brightness uniformity, while the composite nature allows for flexible optimization without requiring a single complex structure type.
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 proposed optical film effectively collimates light and enhances brightness uniformity across the display surface, reducing moiré effects and improving overall display performance.
Implementation Method 1
The irregular prismatic structures may include flat facets at a polar angle from the reference plane and an azimuthal angle along the reference plane. The prismatic structures may be distributed and oriented so that collimated light optical transmission properties of the microstructured surface approximate collimated light optical transmission properties of aggregate conical prismatic structures.
Implementation Method 2
The prismatic structures may be distributed and oriented so that collimated light optical transmission properties of the microstructured surface approximate collimated light optical transmission properties of aggregate conical prismatic structures.
Data Source
AI summary
An optical film includes a microstructured surface comprising a plurality of prismatic structures, the microstructured surface defining a reference plane and a thickness direction perpendicular to the reference plane; wherein the plurality of prismatic structures includes a plurality of facets, each facet having a facet normal direction forming a polar angle with respect to the thickness direction and an azimuthal angle along the reference plane, and wherein the microstructured surface has a surface azimuthal distribution of the plurality of facets that is substantially uniform, and wherein the microstructured surface has a surface polar distribution of the plurality of facets that has an off-axis peak polar distribution.