Backlight Unit Bottom Cover Fixation for Narrow Bezel
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Solution Overview
Problem
The increasing size of liquid crystal display devices leads to higher mold fabrication and transport costs for guide panels, necessitating a more efficient and cost-effective solution for backlight units.
Innovation Solution
A backlight unit design that includes fixation portions with a bottom cover and optical member fixation portions featuring hooks and holders to guide and fasten optical sheets and a liquid crystal panel, eliminating the need for a separate guide panel, thereby reducing material and manufacturing costs while allowing for a narrower bezel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate guide panel is used to support the liquid crystal panel and prevent light leakage, then the structural stability and light leakage prevention are improved, but the mold fabrication cost and transport cost increase significantly for large-size displays
Solution Approach 1:
The patent merges the guide panel function with the bottom cover by integrating fixation portions directly into the bottom cover structure. The bottom cover now performs both its original support function and the additional function of guiding and preventing light leakage, eliminating the need for a separate guide panel and reducing manufacturing complexity and cost.
Solution Approach 2:
The bottom cover is transformed into a multi-functional component that simultaneously supports the liquid crystal panel, guides optical members, prevents light leakage, and provides fixation points for optical sheets. This universal design eliminates the need for separate specialized components, reducing both mold fabrication cost and transport requirements.
2Reliability
If a separate guide panel is used to support the liquid crystal panel, then the panel support function is improved, but the overall weight and structural complexity increase
Solution Approach 1:
The patent combines the panel support function with the bottom cover structure by integrating fixation portions that directly engage with the liquid crystal panel. This eliminates the need for a separate guide panel, reducing structural complexity while maintaining adequate panel support through the integrated fixation mechanism.
3Ease of manufacture
If fixation components are integrated within the backlight unit, then material cost and manufacturing cost are reduced, but the complexity of the bottom cover structure increases
Solution Approach 1:
The bottom cover structure is segmented into functional regions: the main body portion for support, and integrated fixation portions with hooks and holders for securing optical members. This segmentation allows the complex fixation functionality to be organized into modular elements that are easier to manufacture and assemble, offsetting the increased structural complexity.
Solution Approach 2:
The patent merges multiple functions (support, fixation, guidance, light leakage prevention) into the bottom cover structure. While this increases structural complexity, it eliminates the need for separate components, reducing overall material cost and manufacturing complexity when considering the complete assembly.
Data Source
AI summary
A backlight unit is disclosed which includes: optical members configured to each include a sheet ring portion having an optical sheet hole; a bottom cover configured to receive the optical members; and an optical member fixation portion formed in a fixation portion mounting region of the bottom cover, and configured to include a hook and a holder. The hook is inserted into the optical sheet hole.