Backlight Module Plastic Frame Inclined Adhesion Surface
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional backlight modules for slim bezel mobile phones face challenges in achieving full adhesion of square-shaped adhesive tapes without increasing the light-shielding area, leading to reduced adhesion strength and display quality issues due to assembling tolerance and minimum border width limitations.
Innovation Solution
A backlight module design featuring a plastic frame with a dual attachment surface, where the second attachment sub-surface is angled between 50 to 70 degrees, allowing the square-shaped adhesive tape to smoothly transition and adhere fully, ensuring minimal border width and enhanced adhesion strength without increasing the light-shielding area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the square-shaped adhesive tape is moved inwardly by 0.1 mm to account for assembling tolerance, then the border width increases to 0.55 mm, but the adhesion strength is reduced and the light-shielding area is widened
Solution Approach 1:
The plastic frame transitions from a conventional single-plane surface to a multi-dimensional structure with an inclined surface. The inclined surface creates a new geometric dimension that allows the adhesive tape to be positioned at an angle, effectively utilizing the frame's thickness dimension to reduce the light-shielding area while maintaining adequate adhesion area on the top surface.
Solution Approach 2:
The invention changes the geometric parameters of the plastic frame by introducing an inclined surface with a specific angle range (10° to 45°). This parameter change transforms the attachment geometry, allowing the adhesive tape to achieve both sufficient adhesion strength and reduced light-shielding area simultaneously by altering the spatial relationship between the tape and the frame edge.
2Manufacturing precision
If the square-shaped adhesive tape is moved inwardly by 0.1 mm to account for assembling tolerance, then the border width increases to 0.55 mm, but the light-shielding area is widened affecting display quality
Solution Approach 1:
By introducing the inclined surface, the invention utilizes the vertical dimension (frame thickness) to compensate for horizontal positioning tolerance. The adhesive tape can extend closer to the frame edge in the horizontal plane while the inclined surface provides the necessary overlap area in the vertical dimension, thereby reducing the light-shielding area without compromising adhesion reliability.
Solution Approach 2:
The inclined surface angle parameter (10° to 45°) is optimized to balance two competing requirements: a larger angle provides more adhesion area but increases the vertical profile, while a smaller angle reduces the light-shielding area but may insufficiently compensate for tolerance. The specified angle range represents the optimal parameter window that simultaneously addresses both concerns.
3Length of moving object
If the border width is reduced to achieve slim bezel aesthetics, then the frame width is minimized, but the adhesion strength and reliability of the adhesive tape are compromised
Solution Approach 1:
The inclined surface transforms the adhesion geometry from a two-dimensional planar attachment to a three-dimensional angled attachment. This allows the adhesive tape to maintain sufficient adhesion area by utilizing the frame's thickness dimension, enabling ultra-slim border widths without compromising the reliability of the adhesive bonding.
Solution Approach 2:
The inclined surface creates an asymmetric attachment geometry where the adhesive tape is positioned at an angle rather than parallel to the frame edge. This asymmetric configuration optimizes the distribution of adhesive stress and maximizes the effective adhesion area within the constrained border width, thereby enhancing reliability.
Data Source
AI summary
A backlight board and a liquid crystal display apparatus are disclosed. The backlight module includes a plastic frame and a square-shaped adhesive tape. The plastic frame has an attachment surface on the top surface of the plastic frame. The attachment surface includes a first attachment sub-surface and a second attachment sub-surface. The first attachment sub-surface is parallel with a light-exiting surface; the second attachment sub-surface is connected to an end of the first attachment sub-surface, and is at a predetermined angle in relation to a plane on which the first attachment sub-surface is disposed. A portion of the square-shaped adhesive tape that may extend outwardly from an edge of the plastic frame can be attached to a transitional surface to avoid extending out of the plastic frame.