Backlight Light Guide Prisms and Microstructures for Uniform Illumination
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Solution Overview
Problem
Existing backlight devices, such as edge-lit type backlights, face challenges in providing a proper surface light source due to the presence of extra patterns and reduced directivity caused by structures like V-cut structures on the light guide plate, affecting the quality of images displayed.
Innovation Solution
A backlight module with a light guide plate featuring prisms and microstructure groups on its bottom surface, where the prisms control light-emitting angles and the microstructure groups enhance uniformity, preventing patterns and improving directivity of the surface light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If V-cut structures are used on the light guide plate to enhance directivity, then light directionality is improved, but extra patterns emerge on the display image
Solution Approach 1:
The light guide plate is segmented into multiple functional regions: a light receiving region with light-emitting devices, a first light guiding region with prisms for directivity control, and a second light guiding region with different prism configurations. This segmentation allows each region to perform its specific function while preventing pattern formation across the entire plate.
Solution Approach 2:
Different regions of the light guide plate are given different local qualities through varying prism configurations. The first light guiding region has prisms oriented in a first direction, while the second light guiding region has prisms oriented in a second direction different from the first. This local variation in prism orientation controls light directionality without creating uniform patterns that would appear on the display.
2Ease of manufacture
If uniform prism structures are used across the light guide plate, then manufacturing is simplified, but light uniformity and directivity are compromised
Solution Approach 1:
The light guide plate is divided into distinct regions with different prism configurations. The first light guiding region uses prisms extending in a first direction, while the second light guiding region uses prisms extending in a second direction. This segmentation enables optimized light control in different areas while maintaining manufacturability through consistent manufacturing processes applied to each region.
Solution Approach 2:
The patent introduces directional variation in the second dimension by orienting prisms in different directions (first direction vs. second direction) across different regions. This dimensional approach to prism orientation allows control of light uniformity and directivity without compromising the ease of manufacture, as the same manufacturing techniques can be applied to create different orientation patterns.
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 light-emitting efficiency and uniformity of the surface light source, resulting in higher image quality with improved brightness and contrast, free from extra patterns or spots.
Implementation Method 1
The light guide plate includes a plurality of prisms and a plurality of microstructure groups. The prisms are disposed on the bottom surface... light-emitting efficiency of the light guide plate of the backlight module can be enhanced by the prisms on the bottom surface
Implementation Method 2
The microstructure groups include microstructures, and the microstructures respectively connect two of the prisms adjacently disposed... can avoid the surface light source provided by the light-emitting surface emerging patterns corresponded to the prisms
Data Source
AI summary
A backlight module including a plurality of first light-emitting devices and a light guide plate is provided. The light guide plate has a light-emitting surface, a bottom surface, and a first light-receiving side. The first light-receiving side connects the light-emitting surface and the bottom surface, and the light-emitting devices are disposed on the first light-receiving side along a first direction. The light guide plate further includes a plurality of prisms and a plurality of microstructure groups. The prisms are disposed on the bottom surface. The microstructure groups include microstructures, and the microstructures respectively connect two of the prisms adjacently disposed. Each of the microstructures has a long axis. Each of the prisms has a ridgeline extending along a first path. At least one of the microstructure groups has a long axis extending along a second path, which is different from the first path.