Backlight Module Fixing Member Design
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Solution Overview
Problem
Existing backlight module designs for large size display devices face issues with space occupation, dust entry, and manufacturing cost due to thick metal back covers, bending portions that can cut off optical films, and complex plastic frames required for fixing optical film assemblies.
Innovation Solution
A backlight module design featuring a back cover with an optical film assembly, a reflective sheet, and a frame where the reflective sheet's protruding portion is inserted into a hole on the optical film assembly, and the fixing member is attached to both the reflective sheet and the frame, effectively securing the optical film assembly without occupying excessive space and preventing dust entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thick metal back cover with bending portions is used to fix the optical film assembly, then the structural strength is improved, but the space occupation increases and the deckle edges may cut off the optical film
Solution Approach 1:
The fixing structure is segmented into multiple components: the back cover, the optical film assembly, and a separate fixing member. The fixing member is disposed between the back cover and the optical film assembly to provide fixation, allowing each component to be optimized independently for strength and space efficiency.
Solution Approach 2:
A fixing member is introduced as an intermediary element between the back cover and the optical film assembly. This mediator provides the necessary fixation force without requiring the back cover itself to be thick or have complex bending portions, thereby reducing space occupation while maintaining structural strength.
2Reliability
If bending portions are created on the metal back cover to hang the optical film assembly, then the fixation capability is improved, but the span between bending portions cannot be controlled easily and deckle edges may cut off the optical film
Solution Approach 1:
The fixation function is separated from the back cover structure itself and assigned to a dedicated fixing member. This segmentation allows the back cover to maintain simple, easy-to-manufacture geometry while the fixing member provides precise and reliable fixation points with controlled spacing.
Solution Approach 2:
The fixing member acts as an intermediary that provides precise span control between fixation points. It mediates between the back cover and the optical film assembly, ensuring that the distance between fixation points can be accurately controlled during manufacturing without requiring complex bending portions on the back cover.
3Reliability
If a plastic frame with protuberances is used to fix the optical film assembly, then the fixation capability is improved, but the amount of molds increases and manufacturing cost increases
Solution Approach 1:
The fixing member integrates multiple functions into a single component: it provides fixation capability, defines span dimensions, and interfaces with both the back cover and the optical film assembly. This merging eliminates the need for separate complex plastic frames with multiple molds, reducing device complexity and manufacturing cost.
Solution Approach 2:
The fixing member is designed as a multi-functional component that performs fixation, positioning, and spacing control simultaneously. This universal component replaces the need for specialized plastic frames with protuberances, reducing the number of molds required while maintaining reliable fixation capability.
4Reliability
If cupper pillars are embedded in the back cover to fix the optical film assembly, then the fixation capability is improved, but the cost of parts increases and working hours are expended
Solution Approach 1:
The fixation function is extracted from the back cover structure itself and implemented through a separate fixing member. This extraction eliminates the need to embed cupper pillars into the back cover, reducing part costs and manufacturing complexity while maintaining reliable fixation capability.
Solution Approach 2:
The fixing member serves as an intermediary that provides fixation capability without requiring modification of the back cover structure. This mediator approach avoids the costly and time-consuming process of embedding cupper pillars, as the fixing member can be independently manufactured and attached.
Data Source
AI summary
A backlight module includes a back cover, an optical film assembly, a reflective sheet, a frame and a fixing member. The optical film assembly is disposed on the back cover. The optical film assembly has a first protruding portion and a first hole is formed on the first protruding portion. The reflective sheet is disposed between the back cover and the optical film assembly. The reflective sheet has a second protruding portion disposed in the first hole of the first protruding portion. The frame is disposed beside the back cover. A first end of the fixing member is fixed on the second protruding portion of the reflective sheet. A second end of the fixing member is fixed on the frame.