Light Guide Plate with Hierarchical Micro-Macro Structures for Antireflection
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Solution Overview
Problem
Existing light guide plates fail to achieve sufficient antireflection function to extraneous light, which is necessary for enhancing display quality in display devices, as they do not effectively suppress the reflection of light from other sources and maintain a clear image.
Innovation Solution
A light guide plate with a macro concave-convex structure and a micro concave-convex structure arranged in a zigzag pattern on both surfaces, where the micro concave-convex structure has an average period of concavity and convexity less than or equal to the wavelength of visible light, and is formed to follow the macro concave-convex structure, enhancing antireflection by controlling the arrangement direction and height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a light guide plate uses a macro concave-convex structure with oblique surfaces at 30-90 degrees to enable light emission and display patterns, then light extraction efficiency and display pattern visibility are improved, but the plate becomes visible to observers and extraneous light reflection degrades display quality
Solution Approach 1:
The invention divides the surface structure into two distinct levels: macro concave-convex structures for light extraction and micro concave-convex structures for antireflection. The micro structures are formed within the concave regions of the macro structures, creating a hierarchical segmented architecture that simultaneously achieves both light extraction efficiency and suppression of extraneous light reflection without compromising either function
Solution Approach 2:
The micro concave-convex structures are nested within the macro concave-convex structures, with the micro structures positioned in the concave regions and having smaller periods than the macro structures. This nested configuration allows the micro structures to provide antireflection functionality while the macro structures maintain light extraction capability, with the smaller micro structures fitting seamlessly within the larger macro framework
2Object-affected harmful factors
If the micro concave-convex structure has an average period of less than or equal to the wavelength of visible light to achieve antireflection, then extraneous light reflection is suppressed, but the manufacturing precision requirements increase
Solution Approach 1:
The micro concave-convex structures are formed in advance during the molding process by incorporating a micro patterned mold, rather than attempting to form them as secondary steps. This preliminary action integrates the antireflection structure into the base material formation, establishing the precise micro periodicity (less than or equal to visible light wavelength) before subsequent processing, thereby managing manufacturing complexity through advance preparation
Solution Approach 2:
The invention optimizes the average period parameter of the micro concave-convex structures to be less than or equal to the wavelength of visible light, specifically tuning this geometric parameter to achieve the desired antireflection effect. By carefully controlling this critical dimension during manufacturing, the invention achieves suppression of extraneous light reflection while managing the precision requirements through parameter optimization rather than arbitrary high-precision demands
3Object-affected harmful factors
If multiple layers of concave-convex structures are formed on both surfaces to enhance antireflection function, then display quality is improved, but the device complexity increases
Solution Approach 1:
The invention merges the antireflection function and light extraction function into a single integrated structure rather than using separate components. The micro concave-convex structures and macro concave-convex structures are combined in one hierarchical system where the micro structures are positioned within the macro structures, allowing both functions to be achieved simultaneously without requiring separate antireflection coatings or additional layers, thus reducing overall device complexity
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 suppresses the reflection of extraneous light, improving display quality by reducing luminous reflectance and reflection chromaticity, making it difficult for observers to identify leaked light and enhancing light extraction efficiency.
Implementation Method 1
Light that has been incident from a side surface of the light guide plate and has traveled through the light guide plate is totally reflected at this oblique surface
Implementation Method 2
Light is injected into the inside of the light guide plate from a light source that is provided on a side surface of the light guide plate. The light injected in the inside of the light guide plate, that is, internally propagating light propagates through the inside of the light guide plate while reflecting at surfaces of the light guide plate
Implementation Method 3
the internally propagating light is reflected at a surface of the macro concave-convex structure, and is emitted from another surface of the light guide plate
Data Source
AI summary
There is provided a light emitting device that can be used as a light guide plate and has an excellent antireflection function to extraneous light, and an optical body includes: a base material; a macro concave-convex structure that is formed on one surface of the base material and emits internally propagating light that is injected in an inside of the base material from a side surface of the base material, from another surface of the base material; and a micro concave-convex structure formed periodically to follow each of both surfaces of the base material and a surface of the macro concave-convex structure, and having an average period of concavity and convexity of less than or equal to a wavelength of visible light. The surface of the macro concave-convex structure has an inclined surface, and an arrangement of the micro concave-convex structure is a zigzag arrangement.