Backlight Module Rigid Rear Shell Gap Design
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Solution Overview
Problem
In vehicle display modules, manufacturing and assembly tolerances lead to deformation of the backlight module, causing light leakage due to interference between the rigid rear shell and the back plate, which affects display uniformity.
Innovation Solution
A backlight module design featuring a back plate with a mounting space, a backlight component, and a rigid rear shell with a preset gap between the function part and the back plate, utilizing a fixing screw with specific tolerances to avoid deformation and light leakage, including a convex hull and nut design to accommodate manufacturing and assembly tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the rigid rear shell and back plate are fixed tightly through screws to eliminate gaps, then assembly precision is improved, but deformation of the backlight module occurs causing light leakage
Solution Approach 1:
The patent applies beforehand cushioning by designing a buffer structure between the rigid rear shell and back plate. The buffer component is positioned at the connection location to absorb assembly tolerance variations, preventing direct rigid contact that would cause deformation. This cushioning structure allows the assembly to accommodate tolerance variations without transmitting harmful forces to the backlight module, thereby eliminating light leakage while maintaining connection stability.
Solution Approach 2:
The patent uses an intermediary buffer component between the rigid rear shell and back plate. This buffer acts as a mediator that decouples the rigid connection, allowing relative movement to accommodate assembly tolerances. The buffer absorbs the mismatch between components, preventing the transmission of deforming forces to the backlight module, thus resolving the contradiction between tight assembly and prevention of light leakage.
2Manufacturing precision
If manufacturing tolerances are reduced to eliminate gaps, then assembly precision is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent applies parameter changes by modifying the connection structure from rigid direct contact to a buffered connection with controlled clearance. Instead of reducing manufacturing tolerances of the rigid rear shell and back plate, the design changes the connection parameters to include a buffer component with specific dimensional tolerances. This approach achieves the required assembly precision while maintaining reasonable manufacturing tolerances for individual components, thereby reducing manufacturing complexity and cost.
3Stability of the object's composition
If the rigid rear shell is designed with connecting parts for tight fixation, then structural stability is improved, but deformation of the backlight module occurs
Solution Approach 1:
The patent applies beforehand cushioning by incorporating a buffer component in the connection path between the rigid rear shell and back plate. This buffer is positioned beforehand to prevent direct rigid contact that would transmit deforming forces to the backlight module. The cushioning structure maintains structural stability for overall assembly while protecting the backlight module shape from deformation.
Solution Approach 2:
The patent uses a flexible buffer component in the connection structure. This buffer element can deform elastically to accommodate assembly tolerances and prevent rigid force transmission to the backlight module. The flexible nature of the buffer allows it to absorb dimensional variations while maintaining connection stability, thereby preventing backlight module deformation.
Data Source
AI summary
A backlight module includes a back plate, a backlight component, and a rigid rear shell. The back plate includes a bottom plate and a vertical plate enclosing a mounting space. The backlight component is located in the mounting space and fixedly connected with the back plate. The rigid rear shell covers a side of the back plate away from the backlight component. The rigid rear shell includes a function part, a preset gap exists between the function part and the bottom plate. The bottom plate has a first connecting part including a first screw hole. The function part has a second connecting part including a second screw hole. The first connecting part and the second connecting part are connected through a fixing screw penetrating into the first screw hole and the second screw hole. A first gap exists between the first connecting part and the second connecting part.