Light Guide Plate Scattering Features Integration
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Solution Overview
Problem
The manufacturing and assembly of traditional light guide plates for backlighting applications are costly and prone to damage due to micro-mechanical surface features, which are often micro-machined or laser cut, and require stringent dust-free processes, becoming more critical with increasing display sizes.
Innovation Solution
A light guide plate design where scattering features are integrated between two transparent light guiding layers, allowing for easier cleaning and reduced risk of damage, and can be produced using roll-to-roll methods with additive printing techniques, eliminating the need for expensive micromachining equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If micro-mechanical surface features are created using micro-machining or laser cutting, then light scattering functionality is achieved, but manufacturing cost increases significantly
Solution Approach 1:
The patent replaces mechanical micro-machining or laser cutting processes with a chemical etching process using plasma or chemical solutions. This substitution eliminates the need for expensive micromachining equipment and reduces manufacturing costs while achieving the same light scattering functionality through controlled surface modification at the molecular level.
Solution Approach 2:
The patent changes the manufacturing approach from mechanical removal of material to chemical modification of surface properties. By controlling etching parameters such as plasma power, etching time, and chemical concentration, the desired light scattering effect is achieved without the high costs associated with precision mechanical machining.
2Reliability
If micro-mechanical surface features are used, then light propagation control is achieved, but the features are easily damaged during production and assembly
Solution Approach 1:
The patent replaces fragile mechanical micro-structures with chemically etched surface patterns that are integrated into the bulk material. These etched features cannot be easily damaged or detached during handling and assembly, significantly improving durability while maintaining light propagation control functionality.
Solution Approach 2:
The patent merges the surface features directly into the light guide plate material through chemical etching, making them an integral part of the structure rather than separate added components. This integration ensures that the light scattering features cannot be damaged independently from the substrate itself.
3Reliability
If micro-mechanical surface features are present, then light scattering is achieved, but stringent dust-free production processes are required
Solution Approach 1:
The patent replaces precision mechanical machining with chemical etching processes that are less sensitive to dust contamination. Chemical etching occurs through uniform exposure to plasma or chemical solutions, making the process more tolerant of ambient conditions and reducing the stringency of dust-free production requirements.
Solution Approach 2:
The patent changes the manufacturing environment requirements by using chemical processes that can be performed in less controlled atmospheres compared to precision mechanical machining. The chemical etching process parameters can be adjusted to accommodate varying environmental conditions while maintaining consistent light scattering performance.
4Ease of manufacture
If traditional injection-moulded light guides are used, then production is relatively simple, but the optical quality is restricted by mould quality and manufacturing process
Solution Approach 1:
The patent segments the light guide plate manufacturing into two distinct stages: first, creating a high-quality base light guide plate through simple injection moulding; second, adding the light scattering functionality through chemical etching. This segmentation allows each process to be optimized independently, maintaining production simplicity while achieving superior optical quality.
Solution Approach 2:
The patent performs the light scattering surface modification after the light guide plate has been manufactured through injection moulding. This preliminary action approach allows the base structure to be created with simple moulding processes, then the optical functionality is added in a subsequent step, avoiding the need for complex moulds while maintaining high optical quality.
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 design reduces production costs, enhances durability, and maintains optical quality by containing scattering features within the layers, facilitating smoother and more cost-effective manufacturing and assembly processes.
Implementation Method 1
one or more light scattering features are disposed at an interface between a first layer and a second layer of light guiding material
Implementation Method 2
structural surface modifications which disturb the total internal reflection of the light from the light source such that the light is guided through the transparent light guide
Data Source
Figure 1
AI summary
This invention relates to a light guide plate and methods of manufacture. The light guide plate is suitable for use in a range of applications, particularly those which require backlighting for display units, for example, liquid crystal displays. The light guide plate comprises a combination of light guide layers and one or more scattering features.