Optical Sheet Protrusion Fixing for LCD Position Stability
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Solution Overview
Problem
In liquid crystal display (LCD) devices, the optical sheet often moves out of its desired position due to modulation, leading to damage and decreased production yield, resulting in non-uniform image display.
Innovation Solution
The LCD device incorporates an optical sheet with protrusions on two opposite sides that fit into corresponding openings on the bottom frame's counter parts, preventing movement and ensuring proper positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the optical sheet is disposed on the light guide plate without a fixing member, then the assembly process is simple, but the optical sheet moves out of position and gets damaged during modulation
Solution Approach 1:
The optical sheet is divided into multiple sections with protrusions at specific locations, allowing it to be segmented and fitted into corresponding openings on the bottom frame, preventing movement while maintaining assembly simplicity
Solution Approach 2:
The protrusions on the optical sheet are inserted into openings on the bottom frame, creating a nested structure where the optical sheet is positioned within the frame structure, preventing displacement during modulation
2Reliability
If a special fixing member is used to secure the optical sheet, then the optical sheet position is fixed, but the device complexity increases
Solution Approach 1:
The fixing function is merged into the bottom frame structure itself through openings, eliminating the need for separate fixing members and reducing device complexity while maintaining position stability
Solution Approach 2:
The optical sheet has protrusions that automatically fit into the openings on the bottom frame during assembly, providing self-fixing capability without requiring additional fixing members or complex assembly procedures
Data Source
AI summary
A liquid crystal display device includes a liquid crystal panel; a backlight unit disposed under the liquid crystal panel and including a light source and an optical sheet, the optical sheet including a protrusion extending from two opposite sides; and a bottom frame under the backlight unit and including a counter part, the counter part including an opening such that the protrusion is inserted into the opening.