Backlight Module Reflection Sheet Drooping Prevention
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Solution Overview
Problem
Existing backlight modules for LCDs face issues with the reflection sheet drooping due to heat, and current solutions like reinforcing ribs, bumps, or adhesive tapes increase costs and structural complexity.
Innovation Solution
The reflection sheet is bent to form supporting ribs with triangular cross-sections that abut the backplane, providing stable support and a simple structure, while being bonded to the light guide plate with double-sided adhesive tape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reinforcing ribs are added in the space between the reflection sheet and the backplane, then the reflection sheet is supported to prevent drooping, but the cost and weight of the backlight module increase
Solution Approach 1:
The patent merges the support function with the existing backplane structure by forming supporting ribs directly on the backplane surface. The backplane itself is modified to include protruding ribs that provide support, eliminating the need for separate support components and reducing overall weight while maintaining structural integrity and preventing reflection sheet drooping.
2Reliability
If supporting bumps are arranged on the backplane, then the reflection sheet is supported, but the backplane becomes more complex and may warp
Solution Approach 1:
The backplane is segmented into multiple regions with protruding supporting ribs distributed across its surface. These ribs divide the support function into discrete locations rather than requiring a complex overall backplane redesign. Each rib is a simple geometric feature that can be easily manufactured, maintaining backplane simplicity while providing effective support at multiple points.
3Reliability
If adhesive tapes are applied on the bottom surface of the reflection sheet, then the reflection sheet is supported, but the cost increases and performance troubleshooting becomes difficult
Solution Approach 1:
The patent extracts the support function from external components like adhesive tapes and integrates it directly into the backplane structure through protruding ribs. This eliminates the need for separate adhesive tape materials and application processes, reducing manufacturing cost and complexity. The structural support is now inherent to the backplane design, making performance issues easier to diagnose and troubleshoot.
4Device complexity
If the reflection sheet is bent to form supporting ribs, then the structure is simplified and cost is reduced, but the support effectiveness must be maintained
Solution Approach 1:
The backplane features protruding ribs with curved or rounded surfaces rather than sharp angular features. This curvature provides optimal contact surfaces with the reflection sheet, distributing support forces effectively while maintaining structural simplicity. The curved geometry of the ribs enhances support effectiveness without requiring complex manufacturing processes.
Data Source
AI summary
The present invention discloses a backlight module and a LCD using the same. Said backlight module comprises a light guide plate, a reflection sheet and a backplane, wherein said reflection sheet is arranged under the light guide plate; said backplane is arranged under the reflection sheet and partially supports the reflection sheet; and said reflection sheet is bent to form one or more supporting ribs for supporting the backplane to prevent the reflection sheet from drooping. The present invention solves the problem that the reflection sheet is affected by heat and then is easy to droop, by bending the reflection sheet of the backlight module to form the one or more supporting ribs for supporting the reflection sheet, and has the advantages of low cost and no negative influence on other components and system structure of the backlight module.