Backlight Unit Plastic Frame Hook Fixation
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Solution Overview
Problem
Conventional backlight modules with narrow bezels require complex and costly auxiliary fixing structures due to the use of aluminum fins, leading to assembly deviations and light leakage issues.
Innovation Solution
A simplified backlight unit (BLU) design featuring a plastic frame with a hook mechanism and a heat-dissipating plate, including through holes, protrusions, and notches, which securely fasten the components using a fastening system to prevent deformation and light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If aluminum fins are used with auxiliary fixing structures, then the structural strength is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent integrates the fixing structure directly into the plastic frame by forming recesses and protrusions as integral parts of the frame during molding, rather than using separate auxiliary fixing components. This merging of functions reduces device complexity while maintaining the structural strength needed to secure the aluminum fin.
Solution Approach 2:
The plastic frame is divided into functional segments including recesses for receiving the aluminum fin and protrusions for positioning, allowing each segment to serve a specific structural purpose. This segmentation enables the frame to provide both support and fixation functions through its molded geometry alone.
2Reliability
If artificial forcing and screwing methods are used, then the fixing reliability is improved, but the manufacturing precision deteriorates due to deformation
Solution Approach 1:
The plastic frame is pre-formed during molding with recesses and protrusions that automatically guide and position the aluminum fin during assembly. This preliminary preparation of the fixing structure eliminates the need for forceful insertion and subsequent screwing operations that cause deformation.
Solution Approach 2:
The patent replaces the mechanical screwing system with a molded-in recess and protrusion system that provides fixing through geometric interlocking alone. This substitution eliminates the deformation caused by screwing while maintaining reliable fixation.
3Strength
If multiple screws are used for fixing, then the fixing strength is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The fixing function is merged into the plastic frame's molded structure, eliminating the need for separate screws and assembly operations. The recesses and protrusions are formed as integral parts of the frame, making the manufacturing process simpler while maintaining fixing strength through geometric interlocking.
4Adaptability or versatility
If artificial operation is used, then the adaptability is improved, but the productivity deteriorates
Solution Approach 1:
The plastic frame's molded recesses and protrusions enable the aluminum fin to be positioned and fixed automatically during assembly without requiring artificial forcing or adjustment. The geometric features guide the fin into correct alignment and secure it in place, improving productivity while maintaining adaptability through the frame's design.
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 solution provides a stable and cost-effective assembly process that minimizes light leakage and maintains optical performance by ensuring precise alignment and secure fixation of the plastic frame and heat-dissipating plate.
Implementation Method 1
The plastic frame (10) is pressed downward to embed the hook (23) of the heat-dissipating plate (20) in the first through hole (13) of the plastic frame (10). The plastic frame (10) is pressed continually and the hook (23) is connected with a top surface of the first horizontal part (11) of the plastic frame (10).
Implementation Method 2
The BLU further includes a fastening, wherein the fastening penetrates the first vertical part and the second vertical part in order and fixes the plastic frame and the heat-dissipating plate.
Data Source
AI summary
A BLU includes a plastic frame, a heat-dissipating plate, an LED light bar, a light guide, and an optical film. The plastic frame includes a first horizontal part and a first vertical part connected with the first horizontal part. The heat-dissipating plate includes a second horizontal part and a second vertical part. A first through hole penetrating the first horizontal part and the first vertical part is set on the plastic frame. A hook is set on the end of the second vertical part. The second vertical part is close to the first vertical part and the hook clasps the first horizontal part.