Plastic Frame Protrusion for Backlight Module Sealing
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Solution Overview
Problem
Existing backlight modules experience light leakage between the adhesive tape and the display panel due to unstable adhesion caused by warping of the front frame, which compromises sealing and strength.
Innovation Solution
A plastic frame with an upwardly extending protrusion and a mounting surface is used, allowing the adhesive tape to adhere directly to both the front frame and the protrusion, ensuring secure adhesion even if the front frame warps, and an inwardly extending carrying portion facilitates display panel positioning without height differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive tape is used to seal the backlight module, then sealing effect and bonding strength are improved, but light leakage occurs between the adhesive tape and display panel
Solution Approach 1:
The plastic frame is segmented into multiple functional regions: a frame body, an upwardly extending protrusion, and a mounting surface. The protrusion creates a stepped structure that segments the adhesive tape path into two distinct adhesion zones (front frame and protrusion), ensuring the tape remains taut and properly positioned to prevent light leakage while maintaining sealing.
Solution Approach 2:
The solution introduces a vertical dimension by adding an upwardly extending protrusion from the frame body. This protrusion creates a height difference that forms a mechanical stop, preventing the adhesive tape from sagging or curling upward, thereby eliminating light leakage paths while maintaining the sealing effect.
2Strength
If adhesive tape is used to seal the backlight module, then bonding strength is improved, but the front frame warps causing unstable adhesion
Solution Approach 1:
The bonding function is segmented across multiple attachment points: the adhesive tape adheres to both the front frame and the protrusion of the plastic frame. This multi-point attachment distribution reduces stress concentration at any single location, maintaining stable adhesion even when the front frame experiences warping.
Solution Approach 2:
The protrusion acts as a pre-formed mechanical cushioning element that compensates for front frame warping. By providing a fixed reference point and mechanical stop before warping occurs, the protrusion prevents the adhesive tape from becoming loose or misaligned, maintaining stable bonding throughout the product lifecycle.
3Reliability
If the adhesive tape is adhered to the front frame and display panel, then sealing is achieved, but light can still leak through gaps
Solution Approach 1:
The protrusion extends vertically from the frame body, creating a three-dimensional stepped structure. This vertical dimension forms a mechanical barrier that completely blocks light leakage paths between the adhesive tape and display panel, while the adhesive tape maintains proper sealing contact through the protrusion's mechanical stop.
Data Source
AI summary
A plastic frame, a backlight module and a display device including the backlight module are disclosed. The backlight module includes a front frame, a display panel, an adhesive tape and a plastic frame. The plastic frame includes a frame body, an upwardly extending protrusion is provided along an inner edge of the frame body at an inner side of the frame body, and a mounting surface is provided on an upper surface of the frame body at an outer side of the protrusion. The front frame covers the mounting surface, the display panel is carried on an inner side of the plastic frame, the adhesive tape is adhered to the upper surface of the front frame and the upper surface of the protrusion, and the adhesive tape is adhered to the upper surface of the display panel.