公开(公告)号：US20250038129A1

公开(公告)日：2025-01-30

申请号：US18617880

申请日：2024-03-27

Applicant: CHIPBOND TECHNOLOGY CORPORATION

Inventor： Wen-Ping Hsu ,  Yi-Ling Hsieh

IPC: H01L23/00 ,  H01L23/498

Abstract: An inner lead structure of a flexible circuit board includes a flexible substrate, a circuit layer and a dummy circuit layer. A chip mounting area defined on the flexible substrate is provided for a chip, contacting locations defined within the chip mounting area are provided for conductive elements of the chip. The circuit layer includes inner leads, ends of the inner leads are arranged on the contacting locations and provided to be electrically connected to the conductive elements. At least one of first dummy lines of the dummy circuit layer is arranged in a space between the adjacent inner leads. The space having a distance greater than 50 um is divided into multiple spaces having distances not greater than 50 um. Proportion of the spaces without the first dummy lines and having a distance greater than 50 um is less than 0.5% in all spaces.

公开(公告)号：US20240371741A1

公开(公告)日：2024-11-07

申请号：US18614963

申请日：2024-03-25

Applicant: CHIPBOND TECHNOLOGY CORPORATION

Inventor： Hou-Chang Kuo ,  Wen-Ping Hsu ,  Ting-Yi Kuo ,  Yi-Ling Hsieh

IPC: H01L23/498

Abstract: A layout structure of a flexible circuit board includes a flexible substrate, a circuit layer and a dummy circuit layer which are arranged on the flexible substrate. The circuit layer includes first inner leads, second inner leads, an inverted U-shape connection line and a horizontal inner lead. A first distance between the first inner leads is less than a second distance between the second inner leads. One of dummy leads of the dummy circuit layer is located between the first and second inner leads, another dummy lead is located between the second inner leads. The dummy leads are provided to allow lead spaces on both sides of the inverted U-shape connection line is the same. Thus, etching solution will not flow laterally in an etching space between the inverted U-shape connection line and the horizontal inner lead.