Backlight Module Narrow Frame Design via Light Source Nesting
Solution Overview
Problem
The challenge is to enhance the screen ratio of liquid crystal displays by narrowing the lower frame of the backlight module, which existing technologies have not effectively addressed.
Innovation Solution
A backlight module design featuring a support part with a light guide plate and a light source, where the light source is positioned between a protrusion portion and a light incident surface, and a flexible printed circuit board passes through notches in both the backlight module and the liquid crystal display panel to achieve a narrow frame and high screen ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the lower frame of the backlight module is narrowed to increase screen ratio, then the screen ratio is improved, but the structural stability and light source positioning become more difficult
Solution Approach 1:
The support part is segmented into multiple functional regions: a body portion providing overall support, a protrusion portion for precise light source positioning, and notches for flexible circuit board routing. This segmentation allows each component to fulfill its specific function while collectively achieving the narrow frame design with improved structural organization.
Solution Approach 2:
The light source is nested within the space defined by the protrusion portion and the light guide plate, with the flexible printed circuit board nested through the notches in the support part. This nesting arrangement maximizes space utilization in the narrowed frame structure while maintaining all necessary functional connections.
2Area of stationary object
If the lower frame is narrowed to increase screen ratio, then the screen ratio is improved, but the light source positioning precision deteriorates
Solution Approach 1:
The protrusion portion is designed with specific local geometric features including inclined surfaces and positioning facets that provide precise localization for the light source. This localized structural quality ensures accurate light source positioning specifically at the critical interface with the light guide plate, while the rest of the frame remains narrow.
Solution Approach 2:
The support part structure, including the protrusion portion and notches, is pre-formed during manufacturing to provide predetermined positioning features. This preliminary structuring ensures that when the light source and flexible circuit board are assembled, they automatically achieve precise positioning without requiring additional adjustment operations.
3Area of stationary object
If the lower frame is narrowed to increase screen ratio, then the screen ratio is improved, but the flexible printed circuit board routing becomes more difficult
Solution Approach 1:
The support part is segmented to include dedicated notches that create separate routing channels for the flexible printed circuit board. These notches divide the routing path into manageable sections that guide the circuit board through the narrow frame structure, making assembly easier despite the reduced overall frame size.
Solution Approach 2:
The notches in the support part act as intermediary structures that facilitate the passage of the flexible printed circuit board between the backlight module components and the external connection points. These intermediary features mediate the routing challenge by providing predefined pathways that simplify the integration process.
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 configuration allows for a significant reduction in the lower frame of the liquid crystal display, thereby increasing the screen ratio while maintaining efficient light emission and ensuring proper electrical connections and sealing.
Implementation Method 1
a light emitting surface of the light source is attached to the light incident surface
Data Source
AI summary
A backlight module and a liquid crystal display are provided. The backlight module realizes a narrow border of the backlight module by arranging a light source between a first protrusion portion of a support part and a light incident surface of a light guide plate. The backlight module cooperates with the liquid crystal display panel having a second protrusion portion and second notches of a stepped area, and a flexible printed circuit board passes through the second notches of the liquid crystal display panel and the first notches of the backlight module.