News Column

Researchers Submit Patent Application, "Flexible Circuit Board and Ground Line Strucure", for Approval

September 10, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventor Pai, Yu-Chang (Hsinchu County, TW), filed on March 11, 2013, was made available online on August 28, 2014.

The patent's assignee is Novatek Microelectronics Corp.

News editors obtained the following quote from the background information supplied by the inventors: "The disclosure relates to a circuit board and a ground line structure. Particularly, the disclosure relates to a flexible circuit board and a ground line structure.

"Along with development of electronic technology, various electronic products are widely used in people's daily life and work, especially the most commonly used electronic produces such as information products and home appliances, etc. In order to implement a specific function, the electronic product generally includes a printed circuit board in collaboration with a proper circuit layout to implement the specific function. The printed circuit board generally transmits electrical signals through a ground line structure and a signal line structure therein. Based on different applications, the printed circuit boards are usually grouped into rigid printed circuit boards and flexible printed circuit boards. The rigid printed circuit board generally uses a whole slice copper thin film layer as the ground line structure, and the signal line structure is disposed thereon, and the ground line structure and the signal line structure are used in collaboration to transmit electrical signals.

"However, in an application of the flexible printed circuit board, the whole slice copper thin film layer may decrease flexibility of the printed circuit board. Therefore, according to the conventional technique, the ground line structure is designed in a meshed pattern to achieve flexibility of the flexible printed circuit board. However, the design of the meshed pattern may result in a fact that different signal lines of the signal line structure have different impedances relative to the ground line structure, which leads to a great difference in propagation delay between the signal lines. Taking a differential signal as an example, if the difference of the propagation delays is too large, besides a problem of signal skew, an excessive common mode noise is also generated."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventor's summary information for this patent application: "An exemplary embodiment of the disclosure is directed to a ground line structure, which is capable of decreasing signal noise and signal skew.

"An exemplary embodiment of the disclosure is directed to a flexible circuit board including the aforementioned ground line structure, which is capable of decreasing signal noise and signal skew.

"An exemplary embodiment of the disclosure provides a ground line structure, which is adapted to a flexible circuit board. The ground line structure includes a plurality of ground line structure units located on the flexible circuit board to form a meshed pattern. Each of the ground line structure units includes a plurality of ground line edge segments, a ground line middle segment and a plurality of ground line connecting segments. The ground line edge segments define an edge shape of each of the ground line structure units. The edge shape of each of the ground line structure units is a hexagon. The ground line connecting segments are configured to connect the ground line middle segment and the ground line edge segments. The ground line edge segments, the ground line middle segment and the ground line connecting segments form a plurality of pentagonal electrode structures within the hexagonal ground line structure unit.

"In an exemplary embodiment of the disclosure, the pentagonal electrode structures include four pentagonal electrode structures configured in pairs relative to the ground line middle segment.

"In an exemplary embodiment of the disclosure, the edge shapes of the four pentagonal electrode structures are the same by pairs.

"In an exemplary embodiment of the disclosure, the edge shapes of the four pentagonal electrode structures are the same.

"In an exemplary embodiment of the disclosure, the pentagonal electrode structures include two first pentagonal electrode structures and two second pentagonal electrode structures. Two of the ground line edge segments, the ground line middle segment and two of the ground line connecting segments commonly define the edge shape of each of the first pentagonal electrode structures. Three of the ground line edge segments and two of the ground line connecting segments commonly define the edge shape of each of the second pentagonal electrode structures.

"In an exemplary embodiment of the disclosure, each of the pentagonal electrode structures and the adjacent pentagonal electrode structure share at least one ground line connecting segment. Each of the pentagonal electrode structures and the adjacent pentagonal electrode structure share at least one ground line edge segment.

"In an exemplary embodiment of the disclosure, the edge shapes of the pentagonal electrode structures are all the same.

"In an exemplary embodiment of the disclosure, the edge shapes of the pentagonal electrode structures are not completely the same.

"An exemplary embodiment of the disclosure provides a flexible circuit board including a flexible circuit substrate and the aforementioned ground line structure. The ground line structure is disposed on at least one surface of the flexible circuit substrate.

"In an exemplary embodiment of the disclosure, the flexible circuit board further includes a signal line structure. The signal line structure is arranged on the ground line structure to transmit an electrical signal in collaboration with the ground line structure.

"In an exemplary embodiment of the disclosure, the flexible circuit board further includes an insulation layer. The insulation layer is disposed between the ground line structure and the signal line structure.

"An exemplary embodiment of the disclosure provides a ground line structure, which is adapted to a flexible circuit board. The ground line structure includes a plurality of ground line structure units located on the flexible circuit board to form a meshed pattern. The ground line structure units include a plurality of ground line edge segments, a ground line middle segment and a plurality of ground line connecting segments. The ground line edge segments define an edge shape of each of the ground line structure units. The ground line edge segments are formed by a plurality of electrode segment pairs, and each of the electrode segment pairs is located on two opposite edges of the edge shape. The ground line connecting segments are configured to connect the ground line middle segment and the ground line edge segments. Two ground line edge segments of one of the electrode segment pairs are arranged along a specific direction, and the ground line middle segment extends along the specific direction.

"In an exemplary embodiment of the disclosure, an edge shape of each of the ground line structure units is a hexagon.

"In an exemplary embodiment of the disclosure, the ground line edge segments, the ground line middle segment and the ground line connecting segments form a plurality of pentagonal electrode structures within the hexagonal ground line structure unit.

"In an exemplary embodiment of the disclosure, one of the electrode segment pairs is substantially perpendicular to the ground line middle segment.

"In an exemplary embodiment of the disclosure, the electrode segment pairs are arranged along different directions.

"In an exemplary embodiment of the disclosure, any two of the different directions are not perpendicular to each other.

"In an exemplary embodiment of the disclosure, the two ground line edge segments in each of the electrode segment pairs are disposed at two opposite sides of the ground line middle segment.

"In an exemplary embodiment of the disclosure, two electrode segments of each of the electrode segment pairs are parallel to each other.

"In an exemplary embodiment of the disclosure, an included angle between two adjacent ground line edge segments is an obtuse angle.

"In an exemplary embodiment of the disclosure, a first part of the ground line connecting segments extends a long a first direction, and a second part of the ground line connecting segments extends a long a second direction. The first direction is not perpendicular to the second direction.

"In an exemplary embodiment of the disclosure, an included angle between adjacent ground line connecting segments is an obtuse angle.

"In an exemplary embodiment of the disclosure, a first included angle and a second included angle are formed between each of the ground line connecting segments and the ground line edge segment connected thereto. The first included angle is greater than the second included angle.

"In an exemplary embodiment of the disclosure, an included angle between each of the ground line connecting segments and the ground line middle segment connected thereto is an obtuse angle.

"In an exemplary embodiment of the disclosure, the ground line edge segments include M ground line edge segments, wherein M is an even number.

"In an exemplary embodiment of the disclosure, the ground line connecting segments include N ground line connecting segments, wherein N is an even number.

"In an exemplary embodiment of the disclosure, M is greater than N.

"An exemplary embodiment of the disclosure provides a flexible circuit board including a flexible circuit substrate and the aforementioned ground line structure. The ground line structure is disposed on at least one surface of the flexible circuit substrate.

"In an exemplary embodiment of the disclosure, the flexible circuit board further includes a signal line structure. The signal line structure is arranged on the ground line structure to transmit an electrical signal in collaboration with the ground line structure.

"In an exemplary embodiment of the disclosure, the flexible circuit board further includes an insulation layer. The insulation layer is disposed between the ground line structure and the signal line structure.

"According to the above descriptions, in the exemplary embodiment of the disclosure, the ground line structure of the meshed pattern has high evenness, and the signal line structure is arranged on the ground line structure to decrease noise of the transmitted electrical signal.

"In order to make the aforementioned and other features and advantages of the disclosure comprehensible, several exemplary embodiments accompanied with figures are described in detail below.

BRIEF DESCRIPTION OF THE DRAWINGS

"The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification.

"The drawings illustrate embodiments of the disclosure and, together with the description, serve to explain the principles of the disclosure.

"FIG. 1 is a schematic diagram of a flexible circuit board according to an embodiment of the disclosure.

"FIG. 2 is an enlarged view of a block A of the flexible circuit board of FIG. 1.

"FIG. 3 is a schematic diagram of a ground line structure according to an embodiment of the disclosure.

"FIG. 4 illustrates details of a ground line structure unit in the ground line structure of FIG. 3."

For additional information on this patent application, see: Pai, Yu-Chang. Flexible Circuit Board and Ground Line Strucure. Filed March 11, 2013 and posted August 28, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=6574&p=132&f=G&l=50&d=PG01&S1=20140821.PD.&OS=PD/20140821&RS=PD/20140821

Keywords for this news article include: Circuit Board, Electronics, Microelectronics, Novatek Microelectronics Corp.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


For more stories covering the world of technology, please see HispanicBusiness' Tech Channel



Source: Electronics Newsweekly


Story Tools






HispanicBusiness.com Facebook Linkedin Twitter RSS Feed Email Alerts & Newsletters