Projection Backplate for Plastic Frame Bonding Stability
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Solution Overview
Problem
The existing plastic-iron integrated structures in display apparatuses suffer from weak bonding between the plastic frame and the backplate due to a small contact area, leading to instability and potential separation under temperature and humidity fluctuations, affecting the flatness and display quality.
Innovation Solution
A backplate with a projection structure and through holes that increase the contact area between the plastic frame and the backplate, ensuring a stronger bonding force even under environmental changes, by allowing the plastic frame to contact both the inner wall and the surface of the projection structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If through holes are formed in the backplate for integrating the plastic frame, then the plastic-iron integrated structure can be formed, but the contact area between the plastic frame and backplate is small resulting in weak bonding force
Solution Approach 1:
The patent transitions from a single-plane through-hole structure to a multi-dimensional projection structure that extends outward from the backplate surface. This dimensional addition creates multiple contact surfaces (inner wall of through hole + outer surface of projection structure) for the plastic frame to bond with, significantly increasing the bonding area and strength without complicating the manufacturing process.
2Device complexity
If the plastic frame contacts only the inner wall of through holes, then the structure is simple, but the bonding force is weak and the plastic frame separates under temperature and humidity fluctuations
Solution Approach 1:
The projection structure is pre-formed on the backplate before the plastic frame integration process. This preliminary structural preparation ensures that when the plastic frame is molded, it automatically contacts both the inner wall of the through hole and the outer surface of the projection structure, creating a mechanically interlocked structure that resists separation under environmental fluctuations without requiring additional complex features.
3Strength
If the contact area between plastic frame and backplate is increased, then the bonding force is strengthened, but the frame width increases affecting the display device design
Solution Approach 1:
Instead of increasing the frame width (horizontal dimension), the patent utilizes the vertical dimension by adding a projection structure that extends perpendicular to the backplate surface. This allows the plastic frame to contact the projection structure's outer surface, effectively increasing the bonding area in the vertical direction while maintaining a narrow horizontal frame width, thus resolving the contradiction between bonding strength and frame size.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the stability and bonding force between the plastic frame and the backplate, preventing separation and maintaining structural integrity and display quality, while allowing for a narrower frame design without compromising stability.
Implementation Method 1
The plastic material shrinks in case of fluctuations in temperature and/or humidity
Data Source
AI summary
The present invention relates to the display technology field, and provides a backplate, a plastic-iron integrated structure, a backlight unit, and a display device. The backplate is provided with a first through hole, and the first through hole has an inner wall and an outer wall which form a projection structure on the backplate. When the backplate is bonded with a plastic frame to form the plastic-iron integrated structure, the plastic frame not only contacts the inner wall of the first through hole, but also contacts the surface of the projection structure, thus increasing the contact area between the plastic frame and the backplate, and increasing the bonding force between the plastic frame and the backplate. Even when the plastic frame shrinks in case of fluctuations in temperature and/or humidity, the plastic frame is not easily separated from the backplate, and the stability of the formed plastic-iron integrated structure is improved.