Backlight Module Cavity Design for Diffusion Plate Impact Protection
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Solution Overview
Problem
Direct type backlight modules are prone to damage due to the large instant impact force exerted on the diffusion plate during external forces, vibrations, or shocks, as the diffusion plate collides with the supporting pillar of the lamp fixing base.
Innovation Solution
The backlight module design incorporates a back plate with a cavity that allows flexible deformation of the supporting portion of the lamp fixing base, reducing the impact force on the diffusion plate. This is achieved through a supporting portion with a width and length configuration that fits within the cavity, enabling the supporting arms and pillar to absorb external forces, and a reflective film with slits or openings to enhance flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the supporting pillar is rigidly connected to the back plate, then the structural stability is improved, but the diffusion plate is likely to be damaged by collision during vibration or shock
Solution Approach 1:
The patent introduces a cavity structure in the back plate that acts as a cushioning space. When external forces or vibrations occur, the supporting portion can deform flexibly within the cavity, absorbing impact energy before it reaches the diffusion plate. This beforehand cushioning mechanism prevents the rigid transmission of shock forces that would otherwise cause collision damage to the diffusion plate.
Solution Approach 2:
The patent changes the structural parameter of the back plate by introducing a cavity, which transforms the rigid back plate into a flexible structure. The supporting portion is designed with specific width and length parameters that allow it to flex within the cavity boundaries. This parameter change enables the structure to absorb vibrations and reduce impact forces while maintaining overall stability.
2Object-affected harmful factors
If the supporting portion is made flexible to reduce impact force, then the diffusion plate protection is improved, but the structural stability may be compromised
Solution Approach 1:
The patent applies local quality by making only the supporting portion flexible through the cavity design, while the rest of the back plate remains rigid. The supporting portion's width and length are specifically designed to allow controlled flexibility within the cavity, providing impact absorption locally without compromising the overall structural stability of the entire back plate assembly.
Solution Approach 2:
The back plate is segmented into different functional zones: the cavity region that provides flexibility for impact absorption, and the surrounding rigid regions that maintain structural stability. The supporting portion is positioned within the cavity boundaries, creating a segmented structure where flexibility and rigidity coexist in different spatial zones.
3Strength
If the supporting portion width and length are increased to improve support, then the diffusion plate support is improved, but the collision risk with back plate increases
Solution Approach 1:
The patent makes the supporting portion dynamic by allowing it to flex and deform within the cavity during vibration or shock events. The width and length parameters are optimized to provide sufficient support capability under normal conditions while allowing controlled deformation during impact events. This dynamic behavior enables the supporting portion to adapt its rigidity based on external forces, maintaining support strength while reducing collision risk.
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
The design effectively reduces the likelihood of damage to the diffusion plate by absorbing and distributing external forces, thereby minimizing the instant impact force and preventing collisions, while maintaining the structural integrity of the back plate.
Implementation Method 1
the cavity allows flexible deformation of the supporting portion of the lamp fixing base by absorbing the force exerted on the diffusion plate by the supporting portion
Data Source
AI summary
A backlight module includes a back plate, a plurality of lamps, a lamp fixing base, and a diffusion plate. The back plate has a cavity. The lamps are disposed on or above the back plate. The lamp fixing base is disposed on the back plate for fixing the lamps. The lamp fixing base has a supporting portion extending along a direction away from the back plate. An orthogonal projection of the supporting portion on the back plate is within a boundary of the cavity. The diffusion plate is disposed above or over the back plate, and the supporting portion is suitable for supporting the diffusion plate.