Backlight Module Optical Distance Stability via Merged Assembly
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Solution Overview
Problem
The traditional fixing mode of the light guide plate in LCD backlight modules leads to instability in the optical-coupling distance, affecting the optical quality due to material expansion and contraction, necessitating a solution for enhanced stability and assembly convenience.
Innovation Solution
A backlight module comprising a light guide plate, a printed circuit board, and a heat-dissipating bracket, where the light guide plate has protrusions with tapping holes, and the printed circuit board and heat-dissipating bracket have corresponding through holes, allowing for a modular assembly with adjustable retaining members to maintain consistent optical-coupling distance and accommodate expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the light guide plate is fixed using traditional engagement structures with gaps for thermal expansion, then the light guide plate can accommodate material expansion and contraction, but the optical-coupling distance between the light guide plate and light source becomes unstable, affecting optical quality
Solution Approach 1:
The patent merges the light guide plate, printed circuit board, and heat-dissipating bracket into a single integrated assembly. The light guide plate is positioned on the back plate with its light incidence surface facing the printed circuit board, and the heat-dissipating bracket is fixed to the back plate to hold the printed circuit board. This integration eliminates relative movement between components, ensuring stable optical-coupling distance while accommodating thermal expansion through the unified structure.
2Adaptability or versatility
If gaps are left in the fixing position of the light guide plate to allow for expansion, then material expansion can be accommodated, but the assembly process becomes more complex and the optical-coupling distance cannot be ensured
Solution Approach 1:
The patent combines multiple components (light guide plate, printed circuit board, heat-dissipating bracket, and back plate) into a unified assembly structure. The heat-dissipating bracket is fixed to the back plate and simultaneously holds the printed circuit board, while the light guide plate is positioned on the back plate. This merging eliminates the need for separate expansion gaps and complex fixing mechanisms, as the integrated structure naturally accommodates thermal expansion while maintaining precise component positioning.
3Reliability
If the light guide plate is tightly fixed to ensure stable optical-coupling distance, then optical quality is maintained, but the light guide plate cannot accommodate material expansion and contraction
Solution Approach 1:
The patent creates an integrated assembly where the light guide plate, printed circuit board, and heat-dissipating bracket are fixed together as a unit on the back plate. This unified structure provides stable optical-coupling distance through rigid positioning while the entire assembly can expand and contract together as a single unit, accommodating thermal effects without creating internal stress or relative movement between components.
Data Source
AI summary
The utility model relates to a technology field of liquid crystal display, and more particularly to a backlight module and a backlight device. The backlight module provided by the utility model comprises a light guide plate, a printed circuit board, a heat-dissipating bracket and a first retaining member. There has an optical-coupling distance between a light incidence surface of the light guide plate and the printed circuit board. The light incidence surface of the light guide plate disposes more than two light guide plate protrusions thereon. The first retaining member retains the heat-dissipating bracket, the printed circuit board and the light guide plate together to form an independent module. The technical solution of the utility model can enhance the stability of the optical-coupling distance in the backlight module, realize a simple modularization assembly, simplify a mounting process of the back plate, and improve the assembly convenience.