Light Guide Device Microstructures and Diffusive Beads
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Solution Overview
Problem
Conventional backlight modules require costly diffusive films and Brightness Enhancing Films, which account for 30-40% of the total cost, necessitating a solution to reduce manufacturing costs without compromising optical efficiency.
Innovation Solution
A light guide device with specific microstructures and diffusive beads, where the first microstructures are disposed on the reflective surface, second microstructures connect to the incident surface, and diffusive beads are distributed within the body, satisfying certain geometric equations to achieve diffusion without the need for optical films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If diffusive film and BEF are used to achieve light diffusion, then optical efficiency is improved, but manufacturing cost increases significantly
Solution Approach 1:
The patent merges the light diffusion function into the light guide device itself by integrating microstructures and diffusive beads directly into the light guide plate. This eliminates the need for separate diffusive films and BEF layers, thereby reducing manufacturing cost while maintaining optical efficiency.
Solution Approach 2:
The light guide device is designed to perform multiple functions simultaneously: light transmission, light diffusion, and optical path direction. By incorporating microstructures and diffusive beads into the light guide plate, it achieves both structural support and optical diffusion functions, eliminating the need for additional specialized components.
2Ease of manufacture
If optical films are eliminated to reduce cost, then manufacturing cost decreases, but light diffusion capability is compromised
Solution Approach 1:
The patent applies local quality by creating specific microstructures at particular locations on the light guide device. The reflective surface has microstructures with specific geometries and distributions tailored to achieve optimal light diffusion at different regions, ensuring uniform illumination without needing additional optical films.
Solution Approach 2:
The light guide device uses composite structures combining the light guide plate material with integrated microstructures and diffusive beads. This composite design enables the single component to achieve both light guidance and diffusion functions that previously required separate optical film layers.
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 enables effective light diffusion and reduction of the 'Hot Spot phenomenon, enhancing optical efficiency and reducing costs by eliminating the need for additional optical films.
Implementation Method 1
the light ray may be mixed so as to achieve diffusion by means of the diffusive film
Implementation Method 2
the optical path may be directed to the emitting surface by means of microstructures of the light guide device
Data Source
AI summary
The backlight module comprises a light guide device, pluralities of light sources and at least one optical film. The light guide device further contains body, first microstructures, second microstructures, flat portions and diffusive beads. The first microstructures are disposed on reflective surface. A first point and a second point are disposed at two ends of the first microstructure with a first width (P1). Each flat portion has a gap (G) defined between two adjacent first microstructures. The second microstructure connects to the body by means of two edge portions. Two edge portions have a second width (P2) defined on the incident surface; wherein a first depth (H1) is defined to be the distance between the crossing point of two edge portions away from the incident surface. Pluralities of diffusive beads have weight Mb. The body has weight Mt. Then the equations ofH1P2*P1G≤0.288andH1P2*P1G*MtMb≤96.0are satisfied.