Light Guide Plate Assembly Coplanar Design
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Solution Overview
Problem
Conventional backlight modules face issues with non-uniform light distribution and high manufacturing costs due to the use of multiple light guide plates, which result in brightness limitations and economic inefficiencies.
Innovation Solution
A light guide plate assembly comprising multiple light guide plates with connecting parts that allow for coplanar top faces and parallel connecting faces, enabling the formation of a larger area assembly with reduced manufacturing costs and improved optical uniformity through the use of connecting parts, light reflecting sheets, and V-cut grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light guide plates are used in edge type backlight module, then thickness is reduced and image contrast is improved, but non-uniform light distribution occurs due to gaps between plates
Solution Approach 1:
The patent merges multiple light guide plates into a single integrated light guide plate structure. The light guide plate includes multiple light guide regions that are optically coupled through light transmitting connecting portions, eliminating the need for separate plates and their associated gaps. This integration maintains the thin profile while ensuring uniform light distribution across the entire display area.
Solution Approach 2:
The light guide plate is segmented into multiple light guide regions with different optical characteristics, each optimized for specific display zones. These regions are connected through light transmitting portions that allow optical coupling, enabling the single plate to function as multiple independent light guide sections would, without the alignment and gap issues of separate plates.
2Illumination intensity
If optical plates are made larger than display area in direct type backlight module, then non-uniform brightness and abnormal regions are prevented, but molding tool expenses and manufacture cost increase
Solution Approach 1:
The light guide plate features regions with locally optimized optical properties. Different light guide regions have varying refractive indices, thicknesses, or surface structures tailored to specific display area requirements. This local customization allows precise control of light distribution without requiring the entire plate to be oversized, thereby reducing molding costs while maintaining brightness uniformity.
Solution Approach 2:
The patent employs parameter variations within the light guide plate structure, such as changing refractive index, thickness, or surface micro-structures in different regions. These parameter changes enable efficient light distribution across the display area with a plate size that matches the display dimensions, avoiding the need for larger, more expensive plates.
3Manufacturing precision
If connecting parts are added to light guide plates, then assembly tolerance and manufacturing variation are compensated, but device complexity increases
Solution Approach 1:
The connecting portions are integrated directly into the light guide plate structure rather than being separate components. These light transmitting connecting portions are formed as integral parts of the light guide plate during molding, providing alignment and connection functions without adding discrete parts. This integration compensates for assembly tolerances while minimizing structural 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 enhances brightness and color uniformity by reducing light leaks and non-uniform distributions, while lowering manufacturing expenses by allowing smaller plates to be connected into larger assemblies with improved optical performance.
Implementation Method 1
A light reflecting sheet can be disposed on the connecting face of the upper connecting part
Implementation Method 2
A light absorbing sheet can be disposed on the connecting face of the upper connecting part
Implementation Method 3
A plurality of V-cut grooves can be disposed on the connecting face of the upper connecting part
Data Source
AI summary
Alight guide plate assembly for a backlight module is provided. The light guide plate assembly includes a plurality of light guide plates. Each light guide plate has a top face, at least one side face, and at least one connecting part. The connecting part is formed on the side face of the light guide plate. The connecting part has a connecting face, wherein the adjacent connecting faces are connected to each other. The top faces of the plurality of light guide plates are coplanar. A distance between the connecting face and the top face is ⅓ to 1/20 of the thickness of the light guide plate.