Backlight Assembly Optical Sheet Alignment Mechanism
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Solution Overview
Problem
Misalignment and deformation of optical sheets in liquid crystal display (LCD) backlight assemblies due to heat and moisture lead to deteriorated display quality, as the thin and lightweight optical sheets can easily shift relative to the light-guiding plate and LCD panel.
Innovation Solution
A backlight assembly design featuring a mold frame with a sheet-guiding recess and securing protrusion to prevent misalignment of the optical sheet, combined with a sheet tape that secures the optical sheet to the guiding mold, ensuring proper alignment and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the optical sheet is made thin and light in weight, then the material usage is reduced and cost is lowered, but misalignment between the optical sheet and the light-guiding plate occurs due to heat and moisture
Solution Approach 1:
The optical sheet is segmented into a main body and a protruding portion that extends into the mold frame. This segmentation allows the optical sheet to be mechanically divided into functional zones: the main body for light transmission and the protruding portion for positioning and securing, thereby preventing misalignment while using minimal material
Solution Approach 2:
The protruding portion of the optical sheet acts as an intermediary element between the optical sheet and the mold frame. It provides a mechanical interface that secures the optical sheet in position, preventing misalignment caused by heat and moisture while maintaining the thin and lightweight design
2Ease of manufacture
If the optical sheet is thin and lightweight, then manufacturing cost is reduced, but the optical sheet deforms due to heat and moisture
Solution Approach 1:
By dividing the optical sheet into a main body and a protruding portion, the design maintains the cost benefits of a thin, lightweight sheet while the protruding portion provides structural support and stability against deformation from heat and moisture
Solution Approach 2:
The protruding portion serves as a structural intermediary that reinforces the thin optical sheet, providing resistance against thermal and moisture-induced deformation while maintaining overall cost-effectiveness
3Device complexity
If the optical sheet is secured with adhesive tape alone, then the structure is simple, but misalignment occurs due to insufficient securing
Solution Approach 1:
The securing mechanism is segmented into multiple components: the protruding portion of the optical sheet, the sheet-guiding recess in the mold frame, and the adhesive tape. This segmentation creates a multi-functional securing system that prevents misalignment while maintaining relative structural simplicity
Solution Approach 2:
The solution merges mechanical securing (protruding portion fitting into the recess) with adhesive securing (tape application) to create a hybrid securing system that effectively prevents misalignment without excessive complexity
Data Source
AI summary
A backlight assembly includes a light providing unit, an optical sheet, and a mold frame. The light providing unit generates light. The optical sheet has a main body disposed on the light providing unit and a sheet-guiding portion protruding outward from the main body. The mold frame has a frame shape to receive the light providing unit and the optical sheet and includes a sheet-guiding recess and a securing protrusion adjacent to at least one side of the sheet-guiding recess and protruding with respect to an upper surface of the optical sheet to prevent misalignment of the optical sheet. The sheet-guiding recess receives the sheet-guiding portion.