Backlight Module Lug Structure Groove Fixation
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Solution Overview
Problem
In ultra-narrow bezel display designs, the gap between the optical film's lug structure and the middle frame allows light to escape, causing shadows of the lug structure to be visible at certain viewing angles, negatively impacting visual effects and user experience.
Innovation Solution
A backlight module design featuring a middle frame with transverse grooves parallel to the light-exiting surface of the optical film, where the lug structure is inserted and bent to fit onto protrusions on the frame's outer surface, minimizing light leakage and shadow visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the optical film is fixed using traditional chute structures in the middle frame, then the optical film can be securely held, but light leaks through the gap between the lug structure and the middle frame, causing visible shadows at certain viewing angles
Solution Approach 1:
The patent transitions from a traditional vertical chute structure to a horizontal groove structure that extends from the inner surface to the outer surface of the middle frame. This dimensional change allows the lug structure to be fully embedded within the groove, eliminating the vertical gap that caused light leakage while maintaining secure fixation.
Solution Approach 2:
The lug structure of the optical film is nested within the groove of the middle frame, with the fourth portion of the lug structure sleeved over a protrusion structure. This nested configuration ensures the lug structure is completely contained within the frame structure, preventing light from escaping through gaps while maintaining secure attachment.
2Length of moving object
If the lug structure is positioned close to the display region for ultra-narrow bezel design, then the bezel width is reduced, but the shadow of the lug structure becomes visible in the image at certain viewing angles
Solution Approach 1:
The harmful shadow-causing portion (the protruding lug structure) is extracted and repositioned by embedding it within the groove structure. The fourth portion of the lug structure is made to extend along the outer surface and sleeve over the protrusion, effectively hiding the fixation structure from the light path while maintaining its anchoring function.
3Object-affected harmful factors
If a groove structure is formed in the middle frame to accommodate the lug structure, then light leakage is reduced, but the manufacturing complexity increases
Solution Approach 1:
The groove structure in the middle frame serves multiple functions: it accommodates the lug structure to prevent light leakage, provides structural support, and guides the positioning of the optical film. The protrusion structure similarly serves both as a mechanical anchor and as a positioning feature, reducing the need for separate components.
Data Source
AI summary
A backlight module and a display device are provided. The backlight module includes: an optical film including a body portion and a peripheral portion surrounding the body portion, the peripheral portion including a lug structure; and a middle frame arranged at a side where a light-entering surface of the optical film is located and at least including a first portion and a second portion, the first portion being arranged proximate to the peripheral portion of the optical film, the second portion being arranged at a side of the first portion distal to the optical film, the first portion including an inner surface facing an interior of the backlight module and an outer surface opposite to the inner surface. A groove is formed in the first portion and extends from the inner surface to the outer surface.