Multilayer Light Guide Plate for Backlight Module
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Solution Overview
Problem
Traditional light guide plates have limited dot density due to dots being distributed only on the bottom surface, leading to restricted light adjustment capabilities and potential 'dot-connection' phenomena, which affect the light guide effect, especially at longer distances.
Innovation Solution
A light guide plate with dots distributed on multiple layers, including the light-exiting surface, bottom surface, and light-entering surface, where the dot density exceeds 100% by using 3D printing technology to create a multilayered structure with materials of different refractive indices, allowing for improved light scattering and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If dots are distributed only on the bottom surface of the light guide plate, then the manufacturing process is simple, but the dot density is limited and cannot exceed 100%
Solution Approach 1:
The patent transitions from a two-dimensional dot distribution (single layer on bottom surface) to a three-dimensional multi-layer distribution. Dots are arranged in multiple layers at different heights within the light guide plate, with each layer having dots distributed on different surfaces (bottom surface, light-exiting surface, and light-entering surface). This spatial dimensionality change enables the dot density to exceed 100% while maintaining manufacturing feasibility through injection molding with multi-cavity molds.
2Reliability
If dot density is increased to improve light adjustment effect, then the light adjustment capacity improves, but the machining difficulty increases significantly
Solution Approach 1:
The patent segments the dot structure into multiple independent layers, where each layer contains dots distributed on different surfaces of the light guide plate. This segmentation allows each layer to contribute independently to light adjustment, enabling high overall dot density while maintaining manageable manufacturing complexity through standardized injection molding processes with multi-cavity molds.
3Reliability
If dot density exceeds 100%, then the light adjustment capacity is enhanced, but the 'dot-connection' phenomenon occurs easily
Solution Approach 1:
By distributing dots across multiple layers at different heights and positions (bottom surface, light-exiting surface, light-entering surface), the patent creates vertical separation between dot layers. This three-dimensional arrangement prevents horizontal dot-connection while achieving high effective dot density, as dots in different layers do not overlap or connect on the same plane.
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 increased dot density and multi-layer distribution enhance the light guide effect, overcoming the limitations of traditional designs and achieving better light adjustment and evenness across the light guide plate.
Implementation Method 1
The light guide plate is used to adjust the light by destroying total reflection with dots
Implementation Method 2
at least two layers of dots having a refractive index different from the light guide plate body are distributed
Data Source
AI summary
The present invention provides a light guide plate, a backlight module, and a method for manufacturing the light guide plate. The light guide plate include a light guide plate body, on which at least two layers of dots having a refractive index different from the light guide plate body are distributed. According to the light guide plate of the present invention, the dots are distributed on at least two layers, rather than merely on a single interface as that in the traditional light guide plate. As a result, the dot density in an identical region of the light guide plate will exceed the limit of 100%, and thereby a better light guide effect will be achieved. In addition, according to the method of the present invention, the light guide plate is manufactured based on a 3D printing technology.