Dummy Pad Solder Mask for Connector Stability
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Solution Overview
Problem
Tilting and shifting of circuit board connectors in display devices lead to electrical and mechanical failures, causing disconnection issues.
Innovation Solution
The implementation of a display device design featuring a first circuit board with a base film, dummy pads, and a solder mask that exposes specific regions for solder balls to connect with a connector, which includes dummy connection pads and a second solder mask, reducing the range of movement and preventing tilting and shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the connector is directly connected to the circuit board without additional protective structures, then the device complexity is reduced, but the reliability of the connector connection deteriorates due to tilting and shifting
Solution Approach 1:
The patent applies preliminary action by pre-configuring dummy pads and solder masks on the circuit board before connector assembly. These dummy pads are positioned to receive solder balls that will form mechanical and electrical connections with the connector, preventing tilting and shifting before they occur during operation
Solution Approach 2:
The patent introduces solder balls as intermediary elements between the dummy pads and the connector. These solder balls serve as mediators that provide both mechanical support to prevent connector displacement and electrical connection, resolving the contradiction between simple structure and reliable connection
2Manufacturing precision
If the solder mask covers the entire dummy pad, then manufacturing precision is improved, but the solder ball connection reliability deteriorates due to restricted movement range
Solution Approach 1:
The patent applies local quality by creating different regions on the dummy pad with different solder mask coverage. The dummy pad has a first region that is fully covered by the solder mask for manufacturing precision, and a second region that is partially exposed to allow solder ball movement and connection reliability. This local differentiation resolves the contradiction between complete coverage and movement freedom
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 effectively minimizes damage and disconnection failures by limiting the range of movement of solder balls, thereby enhancing the stability and reliability of the connector connections.
Implementation Method 1
a solder ball, wherein the exposed region of the dummy pad is connected to the connector through the solder ball
Data Source
AI summary
The display device includes: a display panel; a first circuit board having a first portion connected to one portion of the display panel and comprising a connector; and a second circuit board electrically connected to the first circuit board through the connector, wherein the first portion includes a base film, a dummy pad disposed on the base film, and a first solder mask partially covering the dummy pad and exposing a portion of the dummy pad, the dummy pad includes a covered region covered by the first solder mask and an exposed region exposed by the first solder mask, and a solder ball, The exposed region of the dummy pad is connected to the connector through a solder ball.