Backlight Module Connecting Strip Design for Impact Resistance
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Solution Overview
Problem
Conventional backlight modules suffer from poor impact resistance, leading to electrical contact issues and components dropping away due to the ease of rotation and collision of the light guide plate with the LED units.
Innovation Solution
A backlight module design featuring a connecting strip with a substrate-connecting section and a back plate-connecting section, where the substrate-connecting section has a wider width than the back plate-connecting section, and the outer light sources protrude beyond the back plate-connecting section, reducing the likelihood of collision and dislodgment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the light guide plate is secured to the back plate by double-sided tape, then the structure is simple and easy to manufacture, but the light guide plate can rotate easily during collision causing LED units to move and lose electrical contact
Solution Approach 1:
The connecting structure is segmented into three distinct parts: the light guide plate-connecting section, the intermediate section, and the circuit board-connecting section. This segmentation allows each section to perform its specific function independently - the light guide plate-connecting section provides secure attachment while the intermediate section with greater width offers enhanced cushioning and rotation resistance, and the circuit board-connecting section ensures stable electrical connection.
Solution Approach 2:
The intermediate section of the connecting strip is designed with a greater width than both the light guide plate-connecting section and the circuit board-connecting section. This wider portion acts as a cushion that absorbs impact energy and prevents the light guide plate from rotating during collision, thereby protecting the LED units from moving and losing electrical contact before the collision actually occurs.
2Productivity
If the light guide plate is freely mounted on the back plate, then the assembly process is simple and fast, but the outer LED units are vulnerable to collision and may escape from the substrate
Solution Approach 1:
The connecting strip incorporates an intermediate section with greater width that extends beyond the light guide plate-connecting section. This wider cushioning portion is positioned beforehand to intercept and absorb collision forces, preventing the light guide plate from rotating and the outer LED units from escaping the substrate during impact events.
Solution Approach 2:
The connecting strip functions as a flexible intermediate structure that can deform elastically during collision. This flexibility allows it to absorb impact energy while maintaining the positional relationship between the light guide plate and circuit board, protecting the LED units from damage without requiring rigid constraints that would complicate assembly.
3Reliability
If a wider connecting structure is used to prevent light guide plate rotation, then impact resistance improves, but the device complexity increases
Solution Approach 1:
The connecting structure is divided into three functional sections with different width characteristics. The intermediate section has greater width to provide cushioning and rotation resistance, while the light guide plate-connecting and circuit board-connecting sections have smaller widths for precise attachment. This segmentation achieves high impact resistance without requiring the entire connecting structure to be uniformly complex.
Solution Approach 2:
The connecting strip exhibits local quality variation where the intermediate section has greater width specifically at the location where cushioning and rotation prevention are most needed. The portions near the light guide plate and circuit board have smaller widths optimized for their respective attachment functions. This localized differentiation achieves maximum impact resistance with minimum overall complexity.
Data Source
AI summary
A backlight module including a back plate, a light source module and a connecting strip is provided. The light source module is disposed on the back plate and includes a substrate and a plurality of light sources, wherein the substrate extends in an extending direction, and the plurality of light sources are disposed on the substrate. The connecting strip connects the substrate and the back plate and includes a substrate-connecting section and a back plate-connecting section, wherein the substrate-connecting section is attached to the substrate, the back plate-connecting section is attached to the back plate. The substrate-connecting section has a first width parallel to the extension direction, the back plate-connecting section has a second width parallel to the extension direction and smaller than the first width, in which the outmost light sources disposed at two sides along the extension direction protrudes respectively beyond two opposite ends of the back plate-connecting section.