Optical Sheet Fixing Unit for Narrow Bezel LCD
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in achieving a narrow bezel and uniform light distribution due to wrinkles or folds in optical sheets, which affect image quality and require complex fixing mechanisms.
Innovation Solution
A fixing unit for optical sheets is introduced, featuring a projecting portion with a fixing part and bridges that are cut to fit with a corresponding indented portion or hook on the bottom cover, allowing for easy and secure attachment without applying physical loads, thus ensuring uniform light distribution and a narrow bezel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex fixing mechanism is used to secure the optical sheet, then the optical sheet can be fixed securely, but the device complexity increases and manufacturing cost increases
Solution Approach 1:
The optical sheet is segmented into a main body and a separate projecting portion. The projecting portion is cut to form bridges that can be folded back to engage with the bottom cover, creating a simple yet effective fixing mechanism without requiring complex components
Solution Approach 2:
The optical sheet itself serves as its own fixing mechanism through the projecting portion and bridges that are integrated into the sheet structure. The bridges fold back automatically during assembly to engage with the bottom cover, eliminating the need for separate fixing components
2Area of stationary object
If the non-display area width is decreased to achieve a narrow bezel, then the display area increases, but the optical sheet may develop wrinkles or folds affecting image quality
Solution Approach 1:
The projecting portion is pre-cut with bridges at specific locations before assembly. These bridges are designed to fold back at predetermined angles during assembly, creating engagement points with the bottom cover that prevent wrinkles and folds in the optical sheet even when the bezel is narrow
Solution Approach 2:
The fixing mechanism utilizes the third dimension by folding the bridges back perpendicular to the optical sheet plane. This vertical engagement with the bottom cover provides secure fixation without requiring additional horizontal space, allowing narrow bezels while maintaining optical sheet flatness
Data Source
AI summary
A liquid crystal display device includes a liquid crystal display panel; a backlight assembly providing light to the liquid crystal display panel and including an optical sheet; a bottom cover supporting the liquid crystal display panel and the backlight assembly and including a side surface having an indented portion; and a fixing unit combined with the indented portion of the side surface of the bottom cover to fix the optical sheet, wherein the optical sheet includes a projecting portion, which is cut to include a fixing part and bridges and is united with the fixing unit.