Segmented Backlight Fixing Tape for LCD Bonding
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Solution Overview
Problem
Existing liquid crystal display devices face issues with material wastage and accuracy in fixing members, leading to insufficient bonding force and foreign matter entry into the backlight unit's light exiting surface due to the use of annular fixing members.
Innovation Solution
An annular fixing member is configured by joining longitudinal unit fixing members, which are accurately disposed to overlap with recessed portions on the panel mounting surface, ensuring flatness and preventing gaps, thus enhancing bonding force and protecting the backlight unit from foreign matter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If an annular fixing member is formed by joining multiple longitudinal portions, then material wastage is reduced and disposal accuracy is improved, but the joint portions become thicker and flatness of the fixing surface deteriorates
Solution Approach 1:
The annular fixing member is divided into multiple longitudinal unit fixing members that are joined together. This segmentation reduces material wastage compared to forming a complete annular member from a single piece, while the joining portions are strategically positioned to minimize impact on flatness.
Solution Approach 2:
The fixing member is designed with different properties at different locations: the longitudinal portions maintain uniform thickness for flatness, while the joining portions locally increase thickness. The recessed portion accommodates this local variation without compromising overall bonding performance.
2Strength
If an annular fixing member is used, then bonding force is sufficient, but the member is difficult to dispose accurately and material wastage increases
Solution Approach 1:
The annular fixing member is segmented into multiple longitudinal units that can be individually positioned and joined. This segmentation improves disposal accuracy during assembly while maintaining the overall annular structure necessary for sufficient bonding force around the liquid crystal panel.
Solution Approach 2:
The unit fixing members are prepared with joining portions in advance, allowing for accurate positioning and joining before final assembly. This preliminary preparation ensures both accurate disposal and sufficient bonding strength.
3Object-affected harmful factors
If a protection member is attached to cover the light exiting surface, then foreign matter entry is prevented, but gaps between the fixing member and backlight unit allow foreign matter to enter via the gap
Solution Approach 1:
The fixing member is designed with an extended portion that protrudes toward the light exiting surface in advance, creating a preliminary barrier against foreign matter entry. This design eliminates the need for separate protection members while maintaining effective protection.
Solution Approach 2:
The fixing member serves multiple functions: it provides bonding force to attach the liquid crystal panel, maintains flatness for proper positioning, and simultaneously acts as a protection member through its extended portion to prevent foreign matter entry. This multi-functionality reduces overall device complexity.
Data Source
AI summary
A backlight unit is provided with: LEDs; optical sheets including a light exiting surface through which light rays from the LEDs exit; a housing member housing the LEDs and the optical sheets, the housing member including an annular panel mounting surface and a recessed portion recessed in the panel mounting surface, the annular panel mounting surface surrounding the light exiting surface and having a liquid crystal panel mounted thereto; and a fixing tape having an annular configuration comprising a plurality of longitudinal unit fixing tapes joined to each other, the unit fixing tapes having fixing surfaces on front and rear surfaces thereof, wherein one fixing surface is fixed to the panel mounting surface, and the plurality of unit fixing tapes are joined at positions overlapping with recessed portions.