Backlight Unit Asymmetric Frame Engagement for Dimensional Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing backlight unit engaging structures require wider buckle elements and T-shaped hooks, leading to inefficiencies in workability and assembly accuracy, resulting in dimensional instability of the outermost size of the modules.
Innovation Solution
A backlight unit design featuring a lower frame with an opening for a light source and light guide plate, and an upper frame with a window, where the engaging portions include a projecting portion on one side surface and a rib with a hole on the other, allowing for stable engagement with a larger hole width than the projecting portion, maintaining the outermost size even with horizontal misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the width of the buckle element and T-shaped groove are made larger to improve workability, then assembly ease is improved, but assembly accuracy deteriorates and dimensional instability occurs
Solution Approach 1:
The engaging portion uses an asymmetric design where the projecting element has a specific width and the corresponding groove has a matching width, eliminating the need for larger clearance. This asymmetric fit ensures both easy assembly and high precision by allowing the components to engage naturally without excessive width differences.
Solution Approach 2:
The patent changes the dimensional parameters of the engaging portion by making the width of the projecting element and groove approximately equal, rather than having significant width differences. This parameter optimization maintains stable workability while improving assembly accuracy and preventing dimensional instability.
2Ease of operation
If the width difference between buckle element and projecting element is increased to improve workability, then assembly ease is improved, but outermost size stability deteriorates
Solution Approach 1:
The engaging portion employs asymmetric geometry where the projecting element and groove have complementary shapes and dimensions. This design allows the components to fit together precisely without requiring excessive width differences, thereby maintaining outermost size stability while ensuring easy assembly.
Solution Approach 2:
The patent optimizes the width parameters of the engaging portion by setting the groove width approximately equal to the projecting element width. This parameter change eliminates the need for large width differences, maintaining both workability and outermost size stability of the backlight module.
Data Source
AI summary
A backlight unit includes a lower frame comprising an opening; a light source arranged in the opening; a light guide plate arranged in the opening; and an upper frame arranged above the lower frame. The unit is so arranged that if one side of a projection (e.g., in the upper frame) is made in contact with one side of a hole (e.g. in the lower frame), then the first side end portion on the first overall end of the side surface of the upper frame is located approximately in the same plane with a first side end portion on the first overall end of the side surface of the lower frame, and the second side end portion on the second overall end of the side surface of the upper frame extends beyond the second side end portion on the second overall end of the side surface of the lower frame.