Pressure-Activated Connection Pads for LED Display Short-Circuit Prevention
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Solution Overview
Problem
In LED display devices, non-mounting of light-emitting diode elements can lead to short circuit defects due to the risk of electrical connections between non-mounted electrodes and cathode electrodes.
Innovation Solution
The connection pads are formed from anisotropic conductive films or non-conductive films that become conductive only under pressure, ensuring electrical connection between mounted electrodes and anode electrodes while maintaining insulation between non-mounted electrodes and cathode electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection pads are formed from conductive materials to ensure electrical connection, then electrical connection between mounted electrodes and anode electrodes is improved, but short circuit defects occur between non-mounted electrodes and cathode electrodes
Solution Approach 1:
The connection pad uses anisotropic conductive film that exhibits different electrical properties in different directions and under different pressure conditions. When pressure is applied (light-emitting diode element mounted), the film becomes conductive to establish electrical connection. When no pressure is applied (light-emitting diode element non-mounted), the film remains insulating to prevent short circuit defects. This local quality change based on pressure condition resolves the contradiction between ensuring connection reliability and preventing short circuits.
Solution Approach 2:
The electrical conductivity of the connection pad is made dynamic rather than static. The anisotropic conductive film transitions between insulating and conductive states based on the presence or absence of pressure from the light-emitting diode element. This dynamic property allows the connection pad to adapt its electrical characteristics according to the mounting status, simultaneously achieving reliable connection when mounted and preventing short circuits when non-mounted.
2Ease of manufacture
If conventional conductive materials are used for connection pads, then ease of manufacture is improved, but the risk of short circuit defects increases
Solution Approach 1:
The connection pad employs anisotropic conductive film, which is a composite material combining conductive and insulating properties in a single layer. This composite material allows the connection pad to function as both conductor and insulator depending on pressure application, thereby preventing short circuit defects while maintaining manufacturing feasibility through established film deposition techniques.
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
Prevents short circuit defects by ensuring electrical insulation between non-mounted electrodes and cathode electrodes, even when light-emitting diode elements are not properly mounted.
Implementation Method 1
The connection pad is formed from an insulating film that becomes conductive when pressure is applied
Data Source
AI summary
The reliability of a display device improves. The present disclosure is to form a connection pad not from a simple metal film but from an insulating film that becomes conductive when pressure is applied.