Microlouver Manufacturing via Bent Substrate Patterning
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Solution Overview
Problem
Conventional methods for manufacturing microlouvers face challenges in forming various shapes and achieving uniform light distribution, leading to issues with pattern resolution, yield, and cost due to the use of complex components like Fresnel lenses and surface flatness problems.
Innovation Solution
A manufacturing method involving laminating a transparent photosensitive resin on a substrate, bending and holding it to pattern with parallel light, and forming light absorption layers between transparent layers, along with an exposure device design that includes position detection sensors and a stage with a bent surface structure to improve alignment and patterning precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a microlouver with perpendicular light absorption layer is used, then light distribution is controlled, but viewing angle is limited causing dark peripheral display
Solution Approach 1:
The light absorption layer is designed with asymmetric tilt angles relative to the normal of the substrate. The tilt angle varies across different regions of the microlouver structure, allowing light to be directed toward both central and peripheral viewing areas. This asymmetric configuration enables the microlouver to maintain effective light distribution control while expanding the viewing angle to cover both center and peripheral display regions.
2Manufacturing precision
If complex components like Fresnel lenses are used for patterning, then light convergence is achieved, but device complexity and cost increase
Solution Approach 1:
The patent removes the Fresnel lens component from the microlouver structure entirely. Instead of using a Fresnel lens to achieve light convergence and patterning, the invention relies on the geometric configuration of the light absorption layer itself. By extracting the unnecessary optical component and relying on the tilted light absorption layer structure, the device complexity is reduced while maintaining patterning precision through the asymmetric tilt design.
Solution Approach 2:
The patent replaces the optical mechanism of the Fresnel lens with a geometric/mechanical configuration of the light absorption layer. Instead of using refractive optics to control light paths, the invention uses the physical tilt and orientation of the light absorption layer structures to achieve the same light convergence and patterning effects. This substitution eliminates complex optical components while maintaining manufacturing precision.
3Ease of manufacture
If conventional exposure methods are used, then manufacturing process is simple, but pattern resolution and yield are reduced due to surface flatness issues
Solution Approach 1:
The patent applies a preliminary tilting action to the light absorption layer during the manufacturing process. By pre-configuring the light absorption layer with asymmetric tilt angles before the exposure and curing processes, the structure is prepared to receive and direct light appropriately. This preliminary geometric configuration ensures that subsequent exposure steps produce high-resolution patterns with good yield, while maintaining relative simplicity in the overall manufacturing process.
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
This approach enables the formation of microlouvers with improved light distribution properties, increased functionality, enhanced yield, and reduced costs by eliminating the need for complex components and addressing surface flatness issues.
Implementation Method 1
irradiating exposure light constituted with parallel light towards the transparent photosensitive resin while keeping a state of bending at least a part of the transparent substrate to perform patterning on the transparent photosensitive resin
Data Source
AI summary
Provided is an optical element manufacturing method that is capable of forming various kinds of shapes and capable of achieving sophisticated functions, improved yields, and cost reductions. The method includes: a step that applies a transparent photosensitive resin on a transparent substrate with light-shielding patterns provided thereon; a step that forms transparent layers by performing patterning through irradiating exposure light of an arbitrary amount on the transparent photosensitive resin via the transparent substrate with the light-shielding patterns provided thereon; a step that forms light absorption layers by filling a black curable resin between the transparent layers; and an irradiation step that irradiates the exposure light in an oblique direction to the surface of the transparent substrate where the light-shielding patterns are formed in a state where the transparent substrate is being bent.