Edge-Type Back Light Module Partitioning Grooves
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Solution Overview
Problem
The edge-type back light module faces challenges in aligning sub-light-guide-plates (sub-LGPs) during assembly, leading to poor optical quality and uneven brightness between regions due to manufacturing tolerances and inconsistencies in dimensions, resulting in blurry images and bright lines at seams.
Innovation Solution
The back light module incorporates a light-guide-plate (LGP) with partitioning grooves that separate regions for independent light-emitting devices, allowing for regional lighting and reducing alignment needs, while maintaining a compact design and improving optical quality by controlling light distribution through control loops and reflectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a plurality of sub-LGPs are assembled together to achieve regional lighting in an edge-type back light module, then the overall thickness is reduced, but the alignment difficulty increases and optical quality deteriorates
Solution Approach 1:
The patent merges multiple sub-LGPs into a single integrated LGP structure with internal partitioning grooves. Instead of assembling separate sub-LGPs, the invention creates one unified light guide plate that is divided into multiple lighting regions by grooves, eliminating alignment issues while maintaining the thin profile of edge-type design.
Solution Approach 2:
The patent segments the single LGP into multiple functional regions using partitioning grooves. These grooves divide the light guide plate into distinct lighting zones that can be independently controlled, achieving regional lighting without requiring separate sub-LGP components.
2Volume of moving object
If a plurality of sub-LGPs are assembled together to achieve regional lighting, then the overall thickness is reduced, but the optical quality becomes uneven and bright lines appear at seams
Solution Approach 1:
By merging sub-LGPs into a single integrated LGP, the patent eliminates the seams between components that cause bright lines and optical quality variations. The unified structure ensures consistent optical properties across all lighting regions without the defects associated with assembled multiple pieces.
3Volume of moving object
If independent sub-LGPs are used for regional lighting, then the thickness is reduced, but the manufacturing tolerance causes inconsistency in length, width and thickness
Solution Approach 1:
The patent combines multiple sub-LGP manufacturing processes into a single LGP manufacturing process. This integration ensures that the entire light guide plate is produced as one piece with consistent dimensions and thickness, eliminating the cumulative tolerance errors that occur when assembling multiple separately manufactured components.
4Ease of operation
If a direct-type back light module is used for regional lighting, then the lighting control is simplified, but the overall thickness increases
Solution Approach 1:
The patent adopts a dynamic edge-type lighting approach where light-emitting devices are positioned along the edges of the LGP rather than directly within the panel. This allows for regional lighting control through dynamic switching of edge devices while maintaining a thin overall structure, combining the benefits of both direct and edge-type designs.
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
This design enhances the optical quality of the LCD by providing consistent light sources per region, reducing the visibility of frame switching blur and energy consumption, and eliminating the need for precise alignment of sub-LGPs, thus improving display quality and reducing manufacturing complexities.
Implementation Method 1
a light-guide-plate (LGP) with partitioning grooves that separate regions for independent light-emitting devices, allowing for regional lighting and reducing alignment needs
Data Source
AI summary
A liquid crystal display (LCD) and a back light module are provided. The back light module includes a light guide plate (LGP) and a plurality of light-emitting devices. The LGP has a plurality of partitioning grooves, a bottom surface, a light exiting surface, a first side and a second side. The bottom surface is opposite to the light exiting surface. The first side and the second side are located at the two opposite side surfaces of the LGP. The extension direction of each of the partitioning grooves extends from the first side towards the second side. Each of the partitioning grooves has an opening and the opening is located at the bottom surface. The plurality of light-emitting devices are disposed at least one of the first side and the second side. The liquid crystal panel of the LCD is disposed at the light exiting surface.