LGP Positioning Sheet for LED Alignment
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Solution Overview
Problem
Conventional light-guide-plate positioning systems fail to ensure complete alignment between LED light sources and light guide plates, leading to reduced light utilization and increased design costs in large-size LCDs.
Innovation Solution
A light-guide-plate positioning sheet with a fixing portion, positioning portion, connecting portion, and retaining portion, featuring an adjustable groove and screw member for precise alignment and distance adjustment between the LED light source and light guide plate, ensuring optimal light input and output alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a plastic frame with a formed projection is used to position the light guide plate, then the structure is simple, but the alignment precision between LED light source and light guide plate deteriorates
Solution Approach 1:
The positioning sheet is divided into distinct functional segments: a fixing portion for mounting to the backlight module, a positioning portion with positioning protrusions for precise alignment, and a connecting portion. This segmentation allows each part to optimize its specific function while maintaining overall simplicity.
Solution Approach 2:
The positioning sheet acts as an intermediary component between the LED light source and the light guide plate. It features positioning protrusions that fit into corresponding cavities, creating a precise mechanical interface that ensures accurate alignment without requiring complex framing structures.
2Area of stationary object
If the light guide plate size is enlarged and thin-type design is implemented, then the display size increases and design flexibility improves, but the pressure from the plastic frame cannot ensure complete alignment
Solution Approach 1:
The positioning sheet concentrates alignment functionality at specific localized points through positioning protrusions and corresponding cavities, rather than relying on distributed pressure from a plastic frame. This localized positioning mechanism maintains precision even as the overall light guide plate area increases.
Solution Approach 2:
The positioning mechanism transitions from planar pressure distribution (plastic frame) to three-dimensional point contact (positioning protrusions in cavities). This dimensional change enables precise alignment across larger and thinner light guide plate configurations by establishing fixed spatial relationships at specific points.
3Device complexity
If conventional positioning methods are used, then the device complexity is low, but the light utilization rate decreases due to incomplete alignment
Solution Approach 1:
The positioning sheet is designed to be self-aligning through its geometric features (positioning protrusions fitting into cavities). Once installed, the structure automatically ensures proper alignment between the LED light source and light guide plate without requiring external adjustment mechanisms, thereby improving light utilization while maintaining simplicity.
Data Source
AI summary
The present invention provides a light-guide-plate (LGP) positioning sheet, which comprises: a fixing portion used to fix the LGP positioning sheet onto a fixing frame of a backlight module, a positioning portion used to abut against and position a light guide plate, and a connecting portion used to connect the fixing portion and the positioning portion. The present invention is further related to a backlight module. According to the LGP positioning sheet and the backlight module of the present invention, the LGP positioning sheet can efficiently ensure the complete alignment between a light emitting diode (LED) light source and a light input side surface of the light guide plate, so as to increase the light utilization rate of the light guide plate.