Tapered Light Guide Bar for Edge-Lit Backlight Thickness Reduction
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Solution Overview
Problem
Conventional edge-lit type backlight modules have a significant volume and weight due to the light guide plate, leading to light leakage when its volume is reduced.
Innovation Solution
A surface light source device comprising a light-emitting source, a light guide film, and a light guide bar, where the light guide bar is tapered to collect and transmit rays to the light guide film, reducing the thickness of the light guide plate and preventing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the volume of the light guide plate is reduced to decrease device volume and weight, then the volume and weight are reduced, but light leakage occurs
Solution Approach 1:
The invention divides the light guide plate into two separate components: a light guide bar and a light guide film. The light guide bar (with volume reduced to approximately 1/20 of the original light guide plate) collects and transmits light rays, while the light guide film (with thickness of 0.1-0.5mm) distributes the light uniformly. This segmentation allows each component to be optimized independently, achieving both volume reduction and light leakage prevention.
Solution Approach 2:
The invention introduces a light guide bar as an intermediary component between the light source and the light guide film. The light guide bar collects rays from the light source and transmits them to the light incident surface of the light guide film, acting as a mediator that enables the system to achieve thin profile while preventing light leakage through proper optical path design.
2Length of moving object
If the thickness of the light guide plate is reduced to decrease device thickness, then the thickness is reduced, but light leakage occurs
Solution Approach 1:
The invention segments the light guide plate into a light guide bar for light collection and transmission, and a thin light guide film for light distribution. The light guide film thickness is reduced to 0.1-0.5mm while the light guide bar maintains sufficient volume for effective light collection, achieving both thin profile and light leakage prevention through functional segmentation.
Solution Approach 2:
The invention applies different structural characteristics to different parts of the system: the light guide bar has a specific tapered structure with larger volume for light collection, while the light guide film has uniform thin structure for light distribution. This local differentiation of structural qualities allows each component to perform its function optimally while achieving overall thin profile.
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 reduces the thickness and weight of the light guide plate, preventing light leakage and decreasing the overall volume and cost of the backlight module while maintaining efficient illumination.
Implementation Method 1
The light guide bar is configured for collecting rays emitted from the light-emitting source and transmitting the rays to the light incident surface of the light guide film
Implementation Method 2
The light guide film is configured for converting the rays to be a surface light source and outputting the surface light source from the second surface
Implementation Method 3
a bottom of the first groove is disposed with a first convex lens structure. The second end is defined with a second groove, and a bottom of the second groove is disposed with a second convex lens structure
Data Source
AI summary
A surface light source device is additionally disposed with a light guide bar between a light-emitting source and a light guide film to collect rays emitted from the light-emitting source and transmit the rays to a light incident surface of the light guide film. A thickness of the light guide bar is designed to be gradually tapered to achieve the objective of reduction in the thickness of a conventional light guide plate. Moreover, the surface light source device can be applied in an edge-lit type backlight module and a display device, as well as in the illumination field.