Display PCB Cover Layer EMI Shielding and Adhesion Inspection
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Solution Overview
Problem
Display apparatuses face challenges in reducing the effects of electromagnetic interference (EMI) and electro-static discharge (ESD), which affect display quality and reliability, and current manufacturing processes have inefficiencies in quality control and yield due to these issues.
Innovation Solution
A display apparatus design that includes a printed circuit board with a conductive cover layer overlapping a ground portion and test electrode, forming a current path, and using connector terminals to connect the PCB to an external control apparatus, which helps in shielding EMI and ESD, and allows for non-destructive adhesion defect inspection to improve manufacturing yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a printed circuit board is used to transmit electric signals to driving units, then display functionality is enabled, but the board becomes vulnerable to electro-magnetic interference and electro-static discharge
Solution Approach 1:
A test electrode is introduced as an intermediary element between the ground portion and external connections. This test electrode serves as a mediator to detect adhesion defects through electrical resistance measurements, enabling quality control without destroying the product
Solution Approach 2:
The product itself (printed circuit board with cover layer) performs the quality inspection function through its own electrical properties. By measuring electrical resistance between the test electrode and ground portion, the product's structural integrity is self-diagnosed without requiring external destructive testing
2Measurement precision
If traditional quality control methods are used to detect adhesion defects, then defect detection is possible, but the process is destructive and reduces production yield
Solution Approach 1:
The electrical resistance measurement method allows the product to self-diagnose adhesion defects through its inherent electrical properties. The test electrode and ground portion form a built-in sensing system that enables non-destructive quality control
Solution Approach 2:
Traditional mechanical or visual inspection methods are replaced with an electrical measurement system. By substituting physical destructive testing with electrical resistance measurement, the system achieves defect detection without mechanical damage to the product
3Reliability
If the cover layer is designed to shield EMI and ESD, then display reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The cover layer is designed to serve multiple functions simultaneously: it provides EMI/ESD shielding protection while also incorporating the test electrode for quality control. This multi-functionality reduces the need for separate components and simplifies the overall manufacturing process
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
The solution enhances display quality and reliability by reducing EMI and ESD effects and improves manufacturing efficiency by enabling non-destructive quality control, thereby reducing losses and increasing production yield.
Implementation Method 1
a conductive layer on and covering at least a part of the printed circuit board, wherein the ground portion is configured to receive a current applied to the test electrode via the conductive layer
Implementation Method 2
not only display quality and reliability of electric characteristics are improved by reducing effects of electro-magnetic interference (EMI) and electro-static discharge (ESD)
Data Source
AI summary
Provided is a display apparatus including: a display panel including a display area and a peripheral area; a printed circuit board attached to the peripheral area and including a ground portion and a test electrode spaced apart from the ground portion; a connector including a plurality of connector terminals connected to an external control apparatus and electrically connecting the printed circuit board and the external control apparatus to each other; and a cover layer arranged on the printed circuit board and covering at least a part of the printed circuit board. Accordingly, not only the display quality and reliability of the electric characteristics of the display apparatus are improved, but also a loss is reduced and a yield is improved during manufacturing processes.