WO2024197827A1 - 柔性电路板和显示装置 - Google Patents
柔性电路板和显示装置 Download PDFInfo
- Publication number
- WO2024197827A1 WO2024197827A1 PCT/CN2023/085517 CN2023085517W WO2024197827A1 WO 2024197827 A1 WO2024197827 A1 WO 2024197827A1 CN 2023085517 W CN2023085517 W CN 2023085517W WO 2024197827 A1 WO2024197827 A1 WO 2024197827A1
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- Prior art keywords
- layer
- area
- circuit board
- signal transmission
- flexible circuit
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0277—Bendability or stretchability details
- H05K1/028—Bending or folding regions of flexible printed circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
- H05K1/0219—Printed shielding conductors for shielding around or between signal conductors, e.g. coplanar or coaxial printed shielding conductors
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
- H05K1/0224—Patterned shielding planes, ground planes or power planes
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
- H05K1/0224—Patterned shielding planes, ground planes or power planes
- H05K1/0225—Single or multiple openings in a shielding, ground or power plane
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
- H05K1/118—Printed elements for providing electric connections to or between printed circuits specially for flexible printed circuits, e.g. using folded portions
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/14—Structural association of two or more printed circuits
- H05K1/147—Structural association of two or more printed circuits at least one of the printed circuits being bent or folded, e.g. by using a flexible printed circuit
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
- H05K1/189—Printed circuits structurally associated with non-printed electric components characterised by the use of flexible or folded printed circuits
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D86/00—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/88—Terminals, e.g. bond pads
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/10128—Display
Definitions
- Embodiments of the present disclosure relate to a flexible circuit board and a display device.
- the driver circuit board of the display panel is usually set on the backlight side of the display panel, and then the binding area on the light-emitting side of the display panel is connected to the driver circuit board on the backlight side of the display panel through a bent flexible circuit board.
- the signal or electromagnetic wave In the process of high-frequency signal transmission, the signal or electromagnetic wave must propagate along a transmission path with uniform impedance. Once the impedance of the transmission path is mismatched or discontinuous, part of the signal or electromagnetic wave will be reflected back to the transmitter, and the remaining part will continue to be transmitted to the receiver.
- the embodiments of the present disclosure provide a flexible circuit board and a display device.
- the flexible circuit board By setting a first single-layer area and a first double-layer area in the transmission line area, the flexible circuit board can be bent or curved in the first single-layer area, so as to have better bending performance and avoid the first single-layer area from generating large stress or breaking.
- the flexible circuit board can also use the second conductive layer in the first double-layer area to perform electromagnetic protection and impedance matching on the signal transmission line, so as to avoid poor display caused by poor data transmission stability, and also improve the anti-electromagnetic interference capability and electromagnetic compatibility (EMC performance) of the flexible circuit board, so as to have a wider range of applications and application scenarios.
- EMC performance anti-electromagnetic interference capability and electromagnetic compatibility
- At least one embodiment of the present disclosure provides a flexible circuit board, comprising: a substrate layer, comprising a first pad area, a second pad area, and a transmission line area located between the first pad area and the second pad area; and a first conductive layer, located on a first side of the substrate layer, and comprising a first pad structure, a second pad structure, and a plurality of signal transmission lines extending along a first direction, wherein the first pad structure is located in the first pad area, the second pad structure is located in the second pad area, the plurality of signal transmission lines are located in the transmission line area, and the transmission line area comprises a first single-layer area and a first double-layer area arranged along the first direction; in the first single-layer area, the first side of the substrate layer is provided with the first conductive layer, and the substrate layer No conductive structure is provided on the second side of the substrate layer.
- the first conductive layer is provided on the first side of the substrate layer
- the second conductive layer is provided on the second side of
- At least part of the first single-layer area is a bending area
- at least part of the first double-layer area is a flat area
- the transmission line area also includes: a second double-layer area, which is located on the side of the first single-layer area away from the first double-layer area in the first direction, and in the second double-layer area, the first side of the substrate layer is provided with the first conductive layer, and the second side of the substrate layer is provided with a third conductive layer.
- the flexible circuit board is bent to form a U-shaped structure, and the U-shaped structure includes a first flat portion, a second flat portion, and a connecting portion located between the first flat portion and the second flat portion, and the connecting portion connects the first flat portion and the second flat portion to semi-enclose a accommodating space; at least part of the first double-layer area is located in the second flat portion, at least part of the first single-layer area and the second double-layer area are located in the connecting portion, at least part of the second double-layer area is located in the connecting portion away from the bottom of the accommodating space, and at least part of the first single-layer area is located between the bottom and the second flat portion.
- the third conductive layer includes a first interconnection line extending along a second direction intersecting with the first direction; the multiple signal transmission lines include a plurality of first signal transmission lines, the multiple first signal transmission lines are configured to transmit the same electrical signal, and the multiple first signal transmission lines are electrically connected to the first interconnection lines, respectively.
- the first signal transmission line is configured to transmit a ground signal.
- the second conductive layer and the third conductive layer are arranged on the same layer.
- the flexible circuit board provided in an embodiment of the present disclosure further includes: a second single-layer area located between the second double-layer area and the first pad area; and a third single-layer area located between the first double-layer area and the second pad area.
- the plurality of signal transmission lines include: a high-frequency signal transmission line configured to transmit a high-frequency signal; and a plurality of first ground lines, wherein the high-frequency signal transmission line is provided with at least one first ground line on both sides of a second direction intersecting the first direction; in the first double-layer area, the second conductive layer is connected to the substrate layer by passing through a first path of the substrate layer; The holes are respectively connected to the first ground wires on both sides of the high-frequency signal transmission line.
- the high-frequency signal transmission line includes: a first high-frequency signal sub-line; and a second high-frequency signal sub-line, and the polarity of the high-frequency signal on the first high-frequency signal sub-line and the polarity of the high-frequency signal on the second high-frequency signal sub-line are different.
- the transmission line area also includes: a third double-layer area, located between the first double-layer area and the second double-layer area, and passing through the first single-layer area to be connected to the first double-layer area and the second double-layer area respectively, the first single-layer area is also located on both sides of the third double-layer area in the second direction, the second direction intersects with the first direction, in the third double-layer area, the first conductive layer is arranged on the first side of the substrate layer, and the fourth conductive layer is arranged on the second side of the substrate layer, the second conductive layer and the third conductive layer are connected through the fourth conductive layer, and are arranged on the same layer.
- the plurality of signal transmission lines include: a high-frequency signal transmission line configured to transmit a high-frequency signal; and a plurality of first ground wires, the high-frequency signal transmission line extending from the first double-layer area through the third double-layer area to the second double-layer area, and the high-frequency signal transmission line is provided with at least one first ground wire on both sides of a second direction intersecting with the first direction; in the first double-layer area, the second conductive layer is connected to the first ground wires on both sides of the high-frequency signal transmission line through first via holes passing through the substrate layer, and in the third double-layer area, the fourth conductive layer is connected to the first ground wires on both sides of the high-frequency signal transmission line through second via holes passing through the substrate layer.
- a flexible circuit board provided by an embodiment of the present disclosure includes: a first protective layer, located in the transmission line area and located on the side of the first conductive layer away from the substrate layer; a second protective layer, located in the first double-layer area and located on the side of the second conductive layer away from the substrate layer; and a first exposure opening, located in the second protective layer and configured to expose the second conductive layer.
- the flexible circuit board provided by one embodiment of the present disclosure also includes: a conductive tape, which is at least partially located on a side of the second protective layer away from the second conductive layer, and contacts the second conductive layer through the first exposed opening, and the conductive tape is configured to be connected to the ground terminal.
- the first exposure opening is located at a side of the center of the first double-layer area close to the first single-layer area in the first direction.
- the flexible circuit board includes a plurality of the first exposure openings arranged along a second direction intersecting the first direction.
- the plurality of signal transmission lines include A second ground line is located at the outermost side of the multiple signal transmission lines; the first conductive layer also includes: a conductive grid, located on a side of the second ground line away from the center of the multiple signal transmission lines and connected to the second ground line; and a protective line, located on a side of the conductive grid away from the second ground line.
- the flexible circuit board provided by an embodiment of the present disclosure also includes: a first protective layer, located in the transmission line area and on the side of the first conductive layer away from the substrate layer; a second protective layer, located in the first double-layer area and on the side of the second conductive layer away from the substrate layer; and a second exposure opening, located in the first protective layer and configured to expose the first conductive layer, the orthographic projection of the second exposure opening on the substrate layer overlaps with the orthographic projection of the second ground line on the substrate layer and the orthographic projection of the conductive grid on the substrate layer, respectively.
- the flexible circuit board provided in an embodiment of the present disclosure further includes: a first electromagnetic shielding coating, which is located on a side of the first protective layer away from the first conductive layer and is in contact with the second ground wire and the conductive grid through the second exposed opening.
- the first electromagnetic shielding coating is only located in the first double-layer area.
- the flexible circuit board provided by one embodiment of the present disclosure also includes: a third exposure opening, located in the second protective layer and configured to expose the second conductive layer; and a second electromagnetic shielding coating, located on a side of the second protective layer away from the second conductive layer and contacting the second conductive layer through the third exposure opening.
- the orthographic projection of the third exposure opening on the substrate layer overlaps with the orthographic projection of the second exposure opening on the substrate layer.
- the first pad structure includes M first conductive pads
- the second pad structure includes M second conductive pads
- the multiple signal transmission lines include a second signal transmission line, the second signal transmission line includes a first end and a second end, the first end of the second signal transmission line includes P branches, and the second end of the second signal transmission line includes P branches; the P branches at the first end of the second signal transmission line are respectively connected to the P first conductive pads, and the P branches at the second end of the second signal transmission line are respectively connected to the P second conductive pads, and P is a positive integer greater than or equal to 2 and less than M.
- the first pad structure includes M first conductive pads
- the second pad structure includes N second conductive pads
- the plurality of signal transmission lines include a third signal transmission line, the third signal transmission line includes a first end and a second end, the first end of the third signal transmission line includes P branches; the first end of the third signal transmission line includes The P branches are respectively connected to the P first conductive pads, the second end of the third signal transmission line is connected to one of the second conductive pads, P is a positive integer greater than or equal to 2 and less than N, and M is greater than N.
- the first pad structure includes M first conductive pads
- the second pad structure includes Q second conductive pads
- the multiple signal transmission lines include: a fourth signal transmission line, extending from the first pad area to the first double-layer area, the fourth signal transmission line includes a first end located in the first pad area and a second end located in the first double-layer area; and a fifth signal transmission line, extending from the first pad area through the first double-layer area to the second pad area, the fifth signal transmission line includes a first end located in the first pad area and a second end located in the second pad area
- the second conductive layer also includes a lateral transmission line, the lateral transmission line is connected to the second end of the fourth signal transmission line through a third via hole passing through the substrate layer, and is connected to the fifth signal transmission line through a fourth via hole passing through the substrate layer.
- the substrate layer is a flexible substrate layer.
- the second conductive layer includes a conductive metal grid.
- the material of the first conductive layer includes copper
- the material of the second conductive layer includes copper
- At least one embodiment of the present disclosure further provides a display device, comprising: a display panel; and any one of the above-mentioned flexible circuit boards.
- a display device provided by an embodiment of the present disclosure also includes: a back plate, located on one side of the display panel; and a driving circuit board, located on a side of the back plate away from the display panel, the display panel includes a binding area and a plurality of binding gaskets located in the binding area, the back plate includes a bottom frame, and the flexible circuit board is bent from the binding area to a side of the back plate away from the display panel; the first pad structure is connected to the plurality of binding gaskets, and the second pad structure is connected to the driving circuit board.
- the first double-layer area is located on a side of the back plate away from the display panel, and at least part of the first single-layer area is a bending area surrounding the bottom frame.
- FIG. 1 is a schematic diagram of a display device.
- FIG. 2 is a schematic plan view of a flexible circuit board provided in accordance with an embodiment of the present disclosure.
- FIG. 3A is a schematic cross-sectional view of a flexible circuit board provided by an embodiment of the present disclosure along line AB in FIG. 2 .
- FIG. 3B is a schematic cross-sectional view of a flexible circuit board provided by an embodiment of the present disclosure along line CD in FIG. 2 .
- FIG. 4A is a schematic diagram of a flexible circuit board provided by an embodiment of the present disclosure being applied to a display device.
- FIG. 4B is a partial schematic diagram of a display device provided according to an embodiment of the present disclosure.
- FIG. 5 is a schematic cross-sectional view of another flexible circuit board provided by an embodiment of the present disclosure along line AB in FIG. 2 .
- FIG. 6 is a layout diagram of a flexible circuit board provided in accordance with an embodiment of the present disclosure.
- FIG. 7 is a schematic diagram of a first conductive layer in a flexible circuit board provided in an embodiment of the present disclosure.
- FIG. 8 is a schematic diagram of a second conductive layer in a flexible circuit board provided in an embodiment of the present disclosure.
- FIG. 9 is a schematic diagram showing that a second conductive layer in a flexible circuit board is connected to a first ground line through a first via hole according to an embodiment of the present disclosure.
- FIG. 10 is a schematic plan view of another flexible circuit board provided in accordance with an embodiment of the present disclosure.
- FIG. 11 is a schematic cross-sectional view of a flexible circuit board provided by an embodiment of the present disclosure along the center line EF of FIG. 10 .
- FIG. 12 is a schematic diagram of a layout of a flexible circuit board provided in accordance with an embodiment of the present disclosure.
- FIG. 13A is a partial schematic diagram of a first pad structure in a flexible circuit board provided in an embodiment of the present disclosure.
- FIG. 13B is a partial schematic diagram of a second pad structure in a flexible circuit board provided in an embodiment of the present disclosure.
- FIG. 14A is a partial schematic diagram of a first pad structure in another flexible circuit board provided in an embodiment of the present disclosure.
- FIG. 14B is a partial schematic diagram of a second pad structure in another flexible circuit board provided in an embodiment of the present disclosure.
- FIG. 15 is a layout diagram of another flexible circuit board provided in an embodiment of the present disclosure.
- FIG. 16 is a plan view of a flexible circuit board provided in accordance with an embodiment of the present disclosure.
- FIG. 17 is a schematic cross-sectional view of a flexible circuit board provided by an embodiment of the present disclosure along line GH in FIG. 16 .
- FIG. 18 is a plan view of a flexible circuit board provided in accordance with an embodiment of the present disclosure.
- FIG. 19 is a schematic cross-sectional view of a flexible circuit board provided by an embodiment of the present disclosure along the JK line in FIG. 18 .
- FIG. 20A is a schematic diagram of the structure of a display device provided in accordance with an embodiment of the present disclosure.
- FIG. 20B is a partially enlarged view of a display device provided in accordance with an embodiment of the present disclosure.
- the features such as “parallel”, “perpendicular” and “same” used in the embodiments of the present disclosure include the situations of “parallel”, “perpendicular”, “same” in a strict sense, as well as the situations of “approximately parallel”, “approximately perpendicular”, “approximately the same” and the like which contain certain errors.
- the above-mentioned “approximately” may mean that the difference of the compared objects is within 10% or 5% of the average value of the compared objects.
- the component or element may be one or more, or may be understood as at least one. "At least one” means one or more, and “plurality” means at least two.
- the clock frequency is usually from tens to hundreds of MHz.
- the high-frequency signal transmission line needs to have high stability, and at the same time, the reflection of the high-frequency signal must be reduced to improve the electromagnetic compatibility (EMC performance) of the product.
- EMC performance electromagnetic compatibility
- a single-layer flexible circuit board is often used to connect the driver circuit board and the display panel, so that the display data given by the host is finally transmitted to the display panel.
- the flexible circuit board can be bent to place the driver circuit board on the backlight side of the display panel, thereby realizing a narrow frame design.
- FIG1 is a schematic diagram of a display device.
- the host 10 transmits display data to the driver circuit board 20 via the LVDS line transmission line, and the driver circuit board 20 then transmits the display data to the display panel 40 via the flexible circuit board 30 to drive the display panel 40 to perform luminous display.
- the display panel 40 includes a display area 41 and a peripheral area 42 surrounding the display area 41; the peripheral area 42 includes a binding area 43, one end of the flexible circuit board 30 is connected to the driver circuit board 20, and the other end is connected to the binding area 43 of the display panel 40.
- a single-layer flexible circuit board only includes a conductive layer for forming a signal transmission line, and other shielding layers or impedance matching layers (such as copper layers) cannot be set. Therefore, the impedance of the high-frequency signal transmission line cannot be controlled, which easily causes the impedance of the high-frequency signal transmission line to be mismatched.
- this impedance mismatch will affect the stability of data transmission and cause display abnormalities; secondly, this impedance mismatch is also likely to cause high-frequency signals to be reflected, so that the flexible circuit board will show poor performance in both electromagnetic compatibility testing and anti-electromagnetic interference testing.
- a double-layer flexible circuit board including two conductive layers can be used to connect the driver circuit board and the display panel.
- the double-layer flexible circuit board causes greater stress on the display panel after bonding with the display panel, which can easily pull up the part where the display panel is bound to the flexible circuit board, causing the backlight to leak from the pulled-up position, resulting in light leakage, Mura and other defects.
- the double-layer flexible circuit board is also harder and is prone to breakage and other defects when bent.
- the embodiment of the present disclosure provides a flexible circuit board.
- the flexible circuit board includes a substrate layer and a first conductive layer; the substrate layer includes a first pad area, a second pad area, and a transmission line area located between the first pad area and the second pad area; the first conductive layer is located on a first side of the substrate layer, and includes a first pad structure, a second pad structure, and a plurality of signal transmission lines extending along a first direction; the first pad structure is located in the first pad area, the second pad structure is located in the second pad area, the plurality of signal transmission lines are located in the transmission line area, and the transmission line area includes a first single-layer area and a first double-layer area arranged along the first direction; in the first single-layer area, the first side of the substrate layer A first conductive layer is provided, and no conductive structure is provided on the second side of the substrate layer.
- the first side of the substrate layer is provided with the first conductive layer
- the second side of the substrate layer is provided with the second conductive layer
- the second side and the first side are opposite sides of the substrate layer.
- the flexible circuit board can also use the second conductive layer in the first double-layer area to perform electromagnetic protection and impedance matching on the signal transmission line, thereby avoiding poor display caused by poor data transmission stability, and also improving the anti-electromagnetic interference capability and electromagnetic compatibility (EMC performance) of the flexible circuit board, thereby having a wider range of applications and application scenarios.
- EMC performance electromagnetic compatibility
- the embodiment of the present disclosure also provides a display device, including a display panel and the above-mentioned flexible circuit board.
- the display device can avoid light leakage and other defects caused by the large stress at the binding position of the flexible circuit board and the display panel, and also has strong electromagnetic compatibility and anti-electromagnetic interference capabilities.
- FIG2 is a plan view of a flexible circuit board provided in an embodiment of the present disclosure
- FIG3A is a cross-sectional view of a flexible circuit board provided in an embodiment of the present disclosure along the AB line in FIG2
- FIG3B is a cross-sectional view of a flexible circuit board provided in an embodiment of the present disclosure along the CD line in FIG2.
- the flexible circuit board 100 includes a substrate layer 110 and a first conductive layer 120;
- the substrate layer 110 includes a first pad area 111, a second pad area 112 and a transmission line area 113 located between the first pad area 111 and the second pad area 112, and the first pad area 111, the transmission line area 113 and the second pad area 112 can be arranged along the first direction X;
- the first conductive layer 120 is located on the first side of the substrate layer 110, and includes a first pad structure 121, a second pad structure 122 and a plurality of signal transmission lines 130 extending along the first direction;
- the first pad structure 121 is located in the first pad area 111, the second pad structure 122 is located in the second pad area 112, and the plurality of signal transmission lines 130 are located in the transmission line area 113.
- the transmission line region 113 includes a first single-layer region 113A and a first double-layer region 113B arranged along a first direction X; in the first single-layer region 113A, a first conductive layer 120 is disposed on a first side of the substrate layer 110, and no conductive structure is disposed on a second side of the substrate layer 110; in the first double-layer region 113B, a first conductive layer 120 is disposed on a first side of the substrate layer 110, and a second conductive layer 140 is disposed on a second side of the substrate layer 110, and the second side and the first side are opposite sides of the substrate layer 110.
- the "single-layer” or “double-layer” in the “single-layer region” and “double-layer region” refers to the number of conductive layers contained in the corresponding region, and is not used to limit the number of other non-conductive layers.
- the first single-layer area only includes a single conductive layer, so it has good bending performance, and is not prone to breakage and excessive stress. Therefore, by setting the first single-layer area and the first double-layer area in the transmission line area, the flexible circuit board can be bent or curved in the first single-layer area, so as to have good bending performance, and avoid the first single-layer area from generating large stress or breaking.
- the flexible circuit board can also use the second conductive layer in the first double-layer area to perform electromagnetic protection and impedance matching on the signal transmission line, so as to avoid poor display caused by poor data transmission stability, and can also improve the anti-electromagnetic interference ability and electromagnetic compatibility (EMC performance) of the flexible circuit board, so as to have a wider range of applications and application scenarios.
- EMC performance electromagnetic compatibility
- the substrate layer may be a flexible substrate layer, and the material of the flexible substrate layer may be a flexible material such as polyimide.
- the material of the first conductive layer may be a conductive metal material such as copper, aluminum, silver, etc.; the material of the second conductive layer may also be a conductive metal material such as copper, aluminum, silver, etc.
- the first single-layer region 113A since the first single-layer region 113A includes only one conductive layer (i.e., the first conductive layer 120) and has good bending or curving performance, at least part of the first single-layer region can be used as a bending region; that is, bending or curving can be performed in the first single-layer region.
- the first double-layer region 113B has two conductive layers (i.e., the first conductive layer and the second conductive layer), so at least part of the first double-layer region can be used as a flat region.
- FIG4A is a schematic diagram of a flexible circuit board provided by an embodiment of the present disclosure and applied to a display device
- FIG4B is a partial schematic diagram of a display device provided by an embodiment of the present disclosure.
- the display device 500 includes a display panel 300, a driving circuit board 400 and the above-mentioned flexible circuit board 100; the driving circuit board 400 is arranged on the backlight side of the display panel 300, one end of the flexible circuit board 100 is bound to the binding area of the display panel 300, and then bent so that the other end is connected to the driving circuit board 400.
- the driving circuit board 400 can transmit display data to the display panel 300 through the flexible circuit board 100 to drive the display panel 300 to perform luminous display.
- the driving circuit board 400 is located on the backlight side of the display panel 300, and the flexible circuit board 100 connects the display panel 300 and the driving circuit board 400 by bending, it will not occupy too much area, so that a narrow frame design can be achieved.
- the first single-layer region 113A of the flexible circuit board 100 can be used as the bending portion of the flexible circuit board 100, and the first double-layer region 113B can be the flat portion of the flexible circuit board 100 located on the backlight side of the display panel 300.
- the flexible circuit board can be designed differently for the bending portion and the flat portion, that is, different numbers of conductive layers are used, so that the flexible circuit board can be both It has good bending performance, strong anti-electromagnetic interference performance and electromagnetic compatibility.
- the flexible circuit board 100 uses the first single-layer area 113A as the bending portion, the stress generated in the first single-layer area 113A is relatively small, and will not generate a large pulling force on the binding area of the display panel 300, thereby preventing the backlight under the display panel 300 from being exposed, causing defects such as light leakage and Mura.
- the second conductive layer 140 of the first double-layer area 113B in the flexible circuit board 100 can not only be used for electromagnetic protection and impedance matching of the signal transmission line 130, but also can be used to achieve other functions.
- the second conductive layer 140 can be provided with a conductive structure to connect with part of the signal transmission lines 130 in the plurality of signal transmission lines 130 to reduce resistance; or, the second conductive layer 140 can be provided with a conductive structure to electrically connect the signal transmission lines 130 transmitting the same signal in the plurality of signal transmission lines 130 to improve the uniformity and stability of the signal.
- the transmission line area 113 further includes a second double-layer area 113C, and the second double-layer area 113C is located on the side of the first single-layer area 113A away from the first double-layer area 113B in the first direction; that is, the first single-layer area 113A is arranged between the first double-layer area 113B and the second double-layer area 113C; in the second double-layer area 113C, the first conductive layer 120 is arranged on the first side of the substrate layer 110, and the third conductive layer 140A is arranged on the second side of the substrate layer 110.
- the flexible circuit board 100 can use other relatively flat parts to set the above-mentioned second double-layer area 113C, so as to use the third conductive layer 140A in the second double-layer area 113C to perform electromagnetic protection and impedance matching on the signal transmission line, thereby avoiding display defects caused by poor data transmission stability, and further improving the anti-electromagnetic interference capability and electromagnetic compatibility (EMC performance) of the flexible circuit board 100.
- the second conductive layer 140 and the third conductive layer 140A are disposed in the same layer. That is, the second conductive layer 140 and the third conductive layer 140A can be formed by the same conductive material layer through the same patterning process.
- the embodiments of the present disclosure include but are not limited to this, and the second conductive layer 140 and the third conductive layer 140A can also be made of different materials and formed through different processes. It should be noted that even if the second conductive layer 140 and the third conductive layer 140A are made of different materials and formed through different processes, the second conductive layer 140 and the third conductive layer 140A can also be located on the side of the substrate layer 110 away from the first conductive layer 120, or on the surface of the substrate layer 110 away from the first conductive layer 120.
- the flexible circuit board 100 is bent to form a U-shaped structure 200
- the U-shaped structure 200 includes a first flat portion 210, a second flat portion 220, and a connecting portion 230 located between the first flat portion 210 and the second flat portion 220, the connecting portion 230 connects the first flat portion 210 and the second flat portion 220 to semi-enclose a receiving space 250; the receiving space 250 can be used to set
- the back panel 510 and the backlight module 520; the backlight module 520 can be an edge-type backlight module or a direct-type backlight module.
- At least part of the first double-layered area 113B is located at the second flat portion 220, at least part of the first single-layered area 113A and the second double-layered area 113C are located at the connecting portion 230, at least part of the second double-layered area 113C is located at the bottom 232 of the connecting portion 230 away from the accommodating space 250, and at least part of the first single-layered area 113A is located between the bottom 232 and the second flat portion 220.
- the flexible circuit board 100 can use the second flat portion 220 to set the first double-layered area 113B, use the bottom 232 of the connecting portion 230 to set the second double-layered area 113C, and use the first single-layered area 113A to bend or bend.
- the flexible circuit board 100 further includes a second single-layer area 113D and a third single-layer area 113E; the second single-layer area 113D is located between the second double-layer area 113C and the first pad area 111; and the third single-layer area 113E is located between the first double-layer area 113B and the second pad area 112.
- the second single-layer area 113D can be used as a bending area between the bottom 232 of the connection portion 230 away from the accommodating space 250 and the second flat portion 220, and the third single-layer area 113E can be used as a transition area between the second pad area 112 and the first double-layer area 113B.
- the first pad area 111, the second single-layer area 113D, the second double-layer area 113C, the first single-layer area 113A, the first double-layer area 113B and the third single-layer area 113E are sequentially arranged in the first direction.
- the size of the flexible circuit board in the first direction may be the sum of the sizes of the first pad area 111, the second single-layer area 113D, the second double-layer area 113C, the first single-layer area 113A, the first double-layer area 113B and the third single-layer area 113E in the first direction.
- the second double-layer area is a transition area between the two bending areas, and can also play a supporting role to prevent the flexible circuit board from being excessively bent into an acute angle and causing the signal transmission line to break.
- interconnection lines can be set on the third conductive layer to connect the signal transmission lines transmitting the same signal in the first conductive layer, thereby improving the uniformity of the signals on these signal transmission lines.
- the first pad area 111 is located at the first flat portion 210; the second single-layer area 113D can be located at the rounded connection portion between the first flat portion 210 and the connection portion 230, so that it has better bending performance and is not prone to breakage or generating large stress; the third single-layer area 113E can serve as a transition area between the second pad area 112 and the first double-layer area 113B.
- the length of the flexible circuit board 100 is equal to the sum of the length of the first pad area 111, the length of the second single-layer area 113D, the length of the second double-layer area 113C, the length of the first single-layer area 113A, the length of the first double-layer area 113B, the length of the third single-layer area 113E, and the length of the second pad area 112.
- the length of the first pad area and the length of the second pad area are equal to the length of the second pad area 113D, the length of the second double-layer area 113C, the length of the first single-layer area 113A, the length of the first double-layer area 113B, the length of the third single-layer area 113E, and the length of the second pad area 112.
- the length of an extent is a fixed value.
- the second single-layer region 113D may be configured as a 1/4 arc, the radius of curvature of which is related to the shape of the back panel of the display device, and may be generally 0.6 to 0.8 mm.
- the second double-layer area 113C can be a transition area between the curved second single-layer area 113D and the curved first single-layer area 113A, which can play a supporting role to prevent the flexible circuit board 100 from being excessively bent into an acute angle and causing the signal transmission line (such as a copper wire) to break; at the same time, the second double-layer area 113 is a flat portion, and its length is equal to the linear length of the bottom of the backplane.
- the first single-layer region 113A may also be configured to be an arc shape, whose outer shape is similar to the rounded corner of the back plate, and whose curvature radius is slightly larger than the curvature radius of the rounded corner of the back plate.
- the first double-layer region 113B starts from where the rounded corner of the back plate ends and ends at the driving circuit board 400 .
- the flexible circuit board 100 also includes a first protective layer 151, a second protective layer 152 and a first exposure opening 161;
- the first protective layer 151 is located in the transmission line area 113, and is located on the side of the first conductive layer 120 away from the substrate layer 110;
- the second protective layer 152 is located in the first double-layer area 113B, and is located on the side of the second conductive layer 140 away from the substrate layer 110;
- the first exposure opening 161 is located in the second protective layer 152, and is configured to expose the second conductive layer 140, so that the second conductive layer 140 can be connected to an external conductive structure to provide voltage or electrical signals to various conductive structures in the second conductive layer 140.
- the first exposure opening 161 is located at one side of the center of the first double-layer region 113B close to the first single-layer region 113A in the first direction.
- the embodiments of the present disclosure include but are not limited to this, and the first exposure opening can also be set at other positions.
- the size of the first exposure opening 161 in the first direction X may be 2 mm, and the size of the first exposure opening 161 in the second direction Y may be 10 mm.
- the embodiments of the present disclosure include but are not limited to this.
- the flexible circuit board 100 includes a plurality of first exposure openings 161 arranged along a second direction Y intersecting the first direction X.
- the flexible circuit board 100 includes three first exposure openings 161 arranged at intervals along the second direction Y.
- the second conductive layer can have a more uniform potential.
- the flexible circuit board 100 may further include a first adhesive layer 171 and a second adhesive layer 172; the first adhesive layer 171 is located between the first conductive layer 120 and the first protective layer 151; the second adhesive layer 172 is located between the second conductive layer 140 and the second protective layer 152.
- the first exposing opening 161 also penetrates the second adhesive layer 172 to expose the second conductive layer 140 .
- FIG5 is a cross-sectional schematic diagram of another flexible circuit board provided by an embodiment of the present disclosure along the AB line in FIG2.
- the flexible circuit board 100 further includes: a conductive tape 270, which is at least partially located on the side of the second protective layer 152 away from the second conductive layer 140, and contacts the second conductive layer 140 through the first exposed opening 161, and the conductive tape 270 is configured to be connected to the ground terminal.
- the flexible circuit board 100 can ground the second conductive layer 140 through the above-mentioned conductive tape 270 and the above-mentioned first exposed opening 161.
- the above-mentioned ground terminal can be a ground terminal on the display panel or a ground terminal on the driving circuit board.
- FIG6 is a layout diagram of a flexible circuit board provided in an embodiment of the present disclosure
- FIG7 is a schematic diagram of a first conductive layer in a flexible circuit board provided in an embodiment of the present disclosure
- FIG8 is a schematic diagram of a second conductive layer in a flexible circuit board provided in an embodiment of the present disclosure. It should be noted that in the embodiments shown in FIG6 to FIG8 , the second conductive layer and the third conductive layer are arranged in the same layer and can be regarded as the same conductive layer.
- the third conductive layer 140A in the second double-layer region 113C of the flexible circuit board 100 includes a first interconnection line 141 extending along a second direction Y intersecting the first direction X; in this embodiment, the third conductive layer 140A and the second conductive layer 140 are disposed in the same layer.
- the plurality of signal transmission lines 130 include a plurality of first signal transmission lines 131, the plurality of first signal transmission lines 131 are configured to transmit the same electrical signal, and the plurality of first signal transmission lines 131 are electrically connected to the first interconnection lines 141, respectively; for example, the plurality of first signal transmission lines 131 can be connected to the first interconnection lines 141 through vias passing through the substrate layer 110, respectively.
- the flexible circuit board 100 can improve the uniformity of the signals on the plurality of first signal transmission lines 131.
- the first signal transmission line 131 is configured to transmit a ground signal, that is, the first signal transmission line 131 is a ground line.
- the interconnection line is suitable for interconnecting multiple ground lines.
- the above-mentioned ground line may include the first ground line and the second ground line mentioned below.
- the embodiments of the present disclosure include but are not limited to this, and the first signal transmission line 131 may also be configured to transmit signals such as power supply voltage and common voltage.
- the second conductive layer 140 of the first double-layer region 113B may also include a second interconnection line 142 to connect the plurality of first signal transmission lines 131 , thereby further improving the uniformity of the signals on the plurality of first signal transmission lines 131 .
- the second interconnection line 142 and the first interconnection line 141 are arranged parallel to each other.
- the embodiments of the present disclosure include but are not limited to this. Since the area of the first double-layer region 113B is relatively large, The second interconnection line may also be selected to have different extension directions and types as required.
- the plurality of signal transmission lines 130 include a high-frequency signal transmission line 132 and two first ground lines 133; the high-frequency signal transmission line 132 is configured to transmit a high-frequency signal; the two first ground lines 133 are located on both sides of the high-frequency signal transmission line 132 in a second direction Y intersecting with the first direction X; in the first double-layer region 113B, the second conductive layer 140 is respectively connected to the two first ground lines 133 through first vias passing through the substrate layer 110.
- the plurality of signal transmission lines 130 include a high-frequency signal transmission line 132 and a plurality of first ground lines 133, and at least one first ground line 133 is respectively disposed on both sides of the high-frequency signal transmission line 132 in the second direction intersecting with the first direction; in the first double-layer region 113B, the second conductive layer 140 is respectively connected to the first ground lines 133 on both sides of the high-frequency signal transmission line 132 through first vias passing through the substrate layer.
- the first ground wire 133 and the second conductive layer 140 located on both sides of the high-frequency signal transmission line 132 can provide a stable electromagnetic environment for the high-frequency signal transmission line 132, and control the impedance of the high-frequency signal transmission line 132, thereby improving the stability of high-frequency signal transmission and avoiding reflection.
- the first ground wire 133 and the second conductive layer 140 located on both sides of the high-frequency signal transmission line 132 can also form a shielding structure, thereby improving the anti-electromagnetic interference performance and electromagnetic compatibility.
- FIG9 is a schematic diagram of a second conductive layer in a flexible circuit board provided by an embodiment of the present disclosure being connected to a first ground line through a first via hole.
- the second conductive layer 140 is respectively connected to two first ground lines 133 through first via holes H1 passing through the substrate layer 110. It should be noted that the second conductive layer in the embodiment of the present disclosure is connected to other signal transmission lines through via holes passing through the substrate layer, as shown in FIG9 and its related description.
- the flexible circuit board 100 may include a plurality of high-frequency signal transmission lines 132 , each of which has two first ground lines 133 disposed on both sides thereof, and two adjacent high-frequency signal transmission lines 132 may share one first ground line 133 .
- a plurality of high-frequency signal transmission lines 132 and a plurality of first ground lines 133 are alternately arranged, and two first ground lines 133 are arranged at the outermost sides of the plurality of high-frequency signal transmission lines 132 .
- each high-frequency signal transmission line 132 includes a first high-frequency signal sub-line 132A and a second high-frequency signal sub-line 132B, and the polarities of the high-frequency signal on the first high-frequency signal sub-line 132A and the high-frequency signal on the second high-frequency signal sub-line 132B are different, thereby having better transmission performance for the high-frequency signal.
- the substrate layer 110 may further include a marking area 119 for forming Various markings.
- the transmission line region 113 also includes a third double-layer region 113F, which is located between the first double-layer region 113B and the second double-layer region 113C, and passes through the first single-layer region 113A to be connected to the first double-layer region 113B and the second double-layer region 113C respectively.
- the first single-layer region 113A is also located on both sides of the third double-layer region 113F in the second direction, and the second direction intersects with the first direction.
- the first conductive layer 120 is disposed on the first side of the substrate layer 110
- the fourth conductive layer 140B is disposed on the second side of the substrate layer 110.
- the second conductive layer 140 and the third conductive layer 140A are connected through the fourth conductive layer 140B and are disposed in the same layer.
- the flexible circuit board 100 can form a third double-layer area 113F between the first double-layer area 113B and the second double-layer area 113C, so as to fully cover the high-frequency signal transmission line 132 in the first direction; thus, the third double-layer area 113F can further provide a stable electromagnetic environment for the high-frequency signal transmission line 132, improve the stability of high-frequency signal transmission and avoid reflection.
- the third double-layer area is locally arranged in the second direction, and the first single-layer area is arranged on both sides thereof, so as to provide electromagnetic shielding for the high-frequency signal transmission line without affecting the bending performance of the flexible circuit board and avoid generating large stress.
- the orthographic projection of the high-frequency signal transmission line 132 on the substrate layer 110 overlaps the first double-layer region 113B, the second double-layer region 113C, and the third double-layer region 113F, respectively.
- the multiple signal transmission lines 130 include a high-frequency signal transmission line 132 and two first ground lines 133; the high-frequency signal transmission line 132 is configured to transmit a high-frequency signal; the two first ground lines 133 are located on both sides of the high-frequency signal transmission line 132 in the second direction; the high-frequency signal transmission line 132 extends from the first double-layer area 113B through the third double-layer area 113F to the second double-layer area 113C; in the first double-layer area 113B, the second conductive layer 140 is respectively connected to the two first ground lines 133 through the first vias passing through the substrate layer 110, and in the third double-layer area 113F, the fourth conductive layer 140B is respectively connected to the two first ground lines 133 through the second vias passing through the substrate layer 110.
- the multiple signal transmission lines 130 include a high-frequency signal transmission line 132 and a plurality of first ground lines 133.
- the high-frequency signal transmission line 132 extends from the first double-layer area 113B through the third double-layer area 113F to the second double-layer area 113C.
- the high-frequency signal transmission line 132 is provided with at least one first ground line 133 on both sides in a second direction intersecting with the first direction.
- the second conductive layer 140 is connected to the first ground lines 133 on both sides of the high-frequency signal transmission line 132 through first via holes passing through the substrate layer 110.
- the fourth conductive layer 140B is connected to the first ground lines 133 on both sides of the high-frequency signal transmission line 132 through second via holes passing through the substrate layer 110.
- the flexible circuit board can be formed by the first double-layer area 113B, the second double-layer area 113C and The third double-layer area 113F provides a continuous and stable electromagnetic environment for the high-frequency signal transmission line 132, thereby further providing a stable electromagnetic environment for the high-frequency signal transmission line 132, improving the stability of high-frequency signal transmission and avoiding reflection.
- the above-mentioned second via hole can refer to the relevant settings of the first via hole in FIG. 9.
- the plurality of signal transmission lines 130 include a second ground line 134, which is located at the outermost side of the plurality of signal transmission lines 130; the first conductive layer 120 further includes a conductive grid 135, which is located on a side of the second ground line 134 away from the center of the plurality of signal transmission lines 130 and connected to the second ground line 134.
- the first conductive layer 120 further includes a protective line 136, which is located on a side of the conductive grid 135 away from the second ground line 134.
- the conductive grid 135 can be connected to the second ground line 134 to reduce the resistance of the second ground line 134 and make full use of the space on the flexible circuit board 100, and the protective line 136 is located on a side of the conductive grid 135 away from the second ground line 134, which can protect the conductive grid 135 and prevent the conductive grid 135 from being torn during the manufacturing and bending process, thereby improving the product yield.
- the transmission line region 113 has a width-enlarged portion 113G, and the protection line 136 is located at the edge of the width-enlarged portion 113G, thereby preventing the conductive grid 135 from being torn during the manufacturing and bending process, thereby improving product yield.
- the second conductive layer 140 may further include a conductive block 144 and a conductive metal grid 146.
- the conductive block 144 is located in the first exposed opening 161 for connecting with the conductive tape 270, and the conductive metal grid 146 is located in the first double-layer region 113B except the first exposed opening 161.
- FIG10 is a schematic plan view of another flexible circuit board provided in an embodiment of the present disclosure
- FIG11 is a schematic cross-sectional view of a flexible circuit board provided in an embodiment of the present disclosure along the center line EF of FIG10
- FIG12 is a schematic layout view of a flexible circuit board provided in an embodiment of the present disclosure.
- FIG12 shows the positions of the second exposure opening and the third exposure opening.
- the flexible circuit board 100 also includes a first protective layer 151, a second protective layer 152 and a second exposure opening 162;
- the first protective layer 151 is located in the transmission line area 113 and is located on the side of the first conductive layer 120 away from the substrate layer 110;
- the second protective layer 152 is located in the first double-layer area 113B and is located on the side of the second conductive layer 140 away from the substrate layer 110;
- the second exposure opening 162 is located in the first protective layer 151 and is configured to expose the first conductive layer 120;
- the orthographic projection of the second exposure opening 162 on the substrate layer 110 overlaps with the orthographic projection of the second ground line 134 on the substrate layer 110 and the orthographic projection of the conductive grid on the substrate layer 110, respectively.
- the flexible circuit board 100 further includes a first electromagnetic The shielding coating 191 is located on a side of the first protective layer 151 away from the first conductive layer 120, and is in contact with the second ground line 134 and the conductive grid through the second exposed opening 162.
- the first electromagnetic shielding coating 191 can further improve the anti-electromagnetic interference capability and electromagnetic compatibility of the flexible circuit board 100.
- the first electromagnetic shielding coating 191 is only located in the first double-layer region 113B, thereby avoiding affecting the bending performance of the flexible circuit board 100 .
- the flexible circuit board 100 further includes a third exposure opening 163 and a second electromagnetic shielding coating 192; the third exposure opening 163 is located in the second protective layer 152 and is configured to expose the second conductive layer 140; the second electromagnetic shielding coating 192 is located on a side of the second protective layer 152 away from the second conductive layer 140, and is disposed in contact with the second conductive layer 140 through the third exposure opening 163.
- the flexible circuit board 100 can further improve the anti-electromagnetic interference performance and electromagnetic compatibility of the flexible circuit board 100 through the third exposure opening 163 and the second electromagnetic shielding coating 192.
- the orthographic projection of the third exposure opening 163 on the substrate layer 110 overlaps with the orthographic projection of the second exposure opening 162 on the substrate layer 110, so that the first electromagnetic shielding coating 191 and the second electromagnetic shielding coating 192 can be electrically connected to each other, thereby further improving the anti-electromagnetic interference performance and electromagnetic compatibility of the flexible circuit board.
- the flexible circuit board 100 shown in FIG. 11 is provided with the above-mentioned first electromagnetic shielding coating 191 and the second electromagnetic shielding coating 192 at the same time, the embodiments of the present disclosure include but are not limited to this, and the flexible circuit board may only be provided with the first electromagnetic shielding coating or the second electromagnetic shielding coating.
- FIG13A is a partial schematic diagram of a first pad structure in a flexible circuit board provided in an embodiment of the present disclosure
- FIG13B is a partial schematic diagram of a second pad structure in a flexible circuit board provided in an embodiment of the present disclosure.
- the first pad structure 121 includes M first conductive pads 1210; the second pad structure 122 includes M second conductive pads 1220; the plurality of signal transmission lines 130 include a second signal transmission line 137, the second signal transmission line 137 includes a first end and a second end, the first end of the second signal transmission line 137 includes P branches 1371, and the second end of the second signal transmission line 137 includes P branches 1372; the P branches 1371 at the first end of the second signal transmission line 137 are respectively connected to the P first conductive pads 1210, and the P branches 1372 at the second end of the second signal transmission line 137 are respectively connected to the P second conductive pads 1220, where P is a positive integer greater than or equal to 2 and less than M.
- the flexible circuit board 100 can reduce the number of signal transmission lines in the transmission line area 113 through the above structure, so that the signal transmission line has a larger line width or increases the interval between the signal transmission lines, thereby improving the circuit board 100. Improve the stability of the flexible circuit board 100.
- the value of P may be 2.
- the first end of the second signal transmission line 137 includes two branches 1371
- the second end of the second signal transmission line 137 includes two branches 1372; the two branches 1371 at the first end of the second signal transmission line 137 are respectively connected to the two first conductive pads 1210, and the two branches 1372 at the second end of the second signal transmission line 137 are respectively connected to the two second conductive pads 1220.
- the embodiments of the present disclosure include but are not limited to this, and the value of P may also be 3, 4, 5, 6, 7, 8, etc.
- the first conductive pad and the second conductive pad can also become gold fingers, the width of the first conductive pad can be 0.09 mm, and the interval between adjacent first conductive pads is 0.09 mm; the width of the second conductive pad can be 0.15 mm, and the interval between adjacent second conductive pads is 0.15 mm.
- FIG. 14A is a partial schematic diagram of a first pad structure in another flexible circuit board provided in an embodiment of the present disclosure
- FIG. 14B is a partial schematic diagram of a second pad structure in another flexible circuit board provided in an embodiment of the present disclosure.
- the first pad structure 121 includes M first conductive pads 1210, and the second pad structure 122 includes N second conductive pads 1220;
- the plurality of signal transmission lines 130 include a third signal transmission line 138, the third signal transmission line 138 includes a first end and a second end, and the first end of the third signal transmission line 138 includes P branches 1381; the P branches 1381 of the first end of the third signal transmission line 138 are respectively connected to the P first conductive pads 1210, and the second end of the third signal transmission line 138 is connected to one second conductive pad 1220, P is a positive integer greater than or equal to 2 and less than N, and M is greater than N.
- the flexible circuit board can reduce the number of signal transmission lines in the transmission line area 113 through the above structure, so that the signal transmission line has a larger line width or increases the interval between the signal transmission lines, thereby improving the stability of the flexible circuit board; on the other hand, the flexible circuit board can also reduce the number of second conductive pads in the second pad structure.
- the value of P may be 2.
- the first end of the third signal transmission line 138 includes two branches 1381; the two branches 1381 of the first end of the third signal transmission line 138 are respectively connected to two first conductive pads 1210, and the second end of the third signal transmission line 138 is connected to a second conductive pad 1220.
- the embodiments of the present disclosure include but are not limited to this, and the value of P may also be 3, 4, 5, 6, 7, 8, etc.
- FIG15 is a layout diagram of another flexible circuit board provided by an embodiment of the present disclosure.
- the first pad structure 121 includes M first conductive pads 1210
- the second pad structure 122 includes Q second conductive pads 1220
- the plurality of signal transmission lines 130 include a fourth signal transmission line 1391 and a fifth signal transmission line 1392.
- the fourth signal transmission line 1391 extends from the first pad area 111 to the first double-layer area 113B, and the fourth signal transmission line 1391 includes a first end located in the first pad area 111 and a second end located in the first double-layer area 113B; the fifth signal transmission line 1392 extends from the first pad area 111 through the first double-layer area 113B to the second pad area 112, and the fifth signal transmission line 1392 includes a first end located in the first pad area 111 and a second end located in the second pad area 112, and the second conductive layer 140 also includes a transverse transmission line 147, and the transverse transmission line 147 is connected to the second end of the fourth signal transmission line 1391 through a third via hole passing through the substrate layer 110, and is connected to the fifth signal transmission line 1392 through a fourth via hole passing through the substrate layer 110.
- the flexible circuit board 100 can connect the fourth signal transmission line 1391 to the fifth signal transmission line 1392 through the fourth signal transmission line 1391 and the transverse transmission line 147, thereby reducing the number of signal transmission lines in the transmission line area 113, so that the signal transmission line has a larger line width or increases the interval between the signal transmission lines, thereby improving the stability of the flexible circuit board.
- the transverse transmission line in the embodiment of the present disclosure is connected to the fourth signal transmission line and the second signal transmission line through the via hole passing through the substrate layer can be seen in Figure 9 and its related description, and the specific structure and setting of the third via hole and the fourth via hole can be seen in the first via hole in Figure 9.
- FIG16 is a schematic plan view of a flexible circuit board provided in accordance with an embodiment of the present disclosure
- FIG17 is a schematic cross-sectional view of a flexible circuit board along line GH in FIG16 provided in accordance with an embodiment of the present disclosure.
- the flexible circuit board 100 includes a substrate layer 110 and a first conductive layer 120;
- the substrate layer 110 includes a first pad area 111, a second pad area 112 and a transmission line area 113 located between the first pad area 111 and the second pad area 112, and the first pad area 111, the transmission line area 113 and the second pad area 112 can be arranged along the first direction X;
- the first conductive layer 120 is located on the first side of the substrate layer 110, and includes a first pad structure 121, a second pad structure 122 and a plurality of signal transmission lines 130 extending along the first direction;
- the first pad structure 121 is located in the first pad area 111, the second pad structure 122 is located in the second pad area 112, and the plurality of signal transmission lines 130 are located in the transmission line area 113.
- the transmission line area 113 includes a second double-layer area 113C, a first single-layer area 113A, and a first double-layer area 113B arranged along the first direction X, but does not include a third double-layer area connecting the first double-layer area and the second double-layer area.
- the first single-layer area 113A the first side of the substrate layer 110 is provided with the first conductive layer 120, and the second side of the substrate layer 110 is not provided with the first conductive layer 120.
- the first conductive layer 120 is disposed on the first side of the substrate layer 110, and the second conductive layer 140 is disposed on the second side of the substrate layer 110; in the second double-layer region 113C, the first conductive layer 120 is disposed on the first side of the substrate layer 110, and the third conductive layer 140A is disposed on the second side of the substrate layer 110; the second side and the first side are opposite sides of the substrate layer 110.
- the "single layer” or “double layer” in the "single layer region” and “double layer region” in the embodiments of the present disclosure refers to the number of conductive layers contained in the corresponding region, and is not used to limit the number of other non-conductive layers.
- the first single-layer area only includes a single conductive layer, so it has good bending performance, and is not prone to breakage and excessive stress. Therefore, by setting the second double-layer area, the first single-layer area and the first double-layer area in the transmission line area, the flexible circuit board can be bent or curved in the first single-layer area, so as to have good bending performance, and can avoid the first single-layer area from generating large stress or breaking.
- the flexible circuit board can also use the second conductive layer in the first double-layer area to perform electromagnetic protection and impedance matching on the signal transmission line, so as to avoid the display being poor due to poor data transmission stability, and can also improve the anti-electromagnetic interference capability and electromagnetic compatibility (EMC performance) of the flexible circuit board, so as to have a wider range of applications and application scenarios.
- the flexible circuit board can also use the third conductive layer in the second double-layer area to perform electromagnetic protection and impedance matching on the signal transmission line, so as to further improve the anti-electromagnetic interference capability and electromagnetic compatibility (EMC performance) of the flexible circuit board.
- the second conductive layer 140 and the third conductive layer 140A are disposed in the same layer. That is, the second conductive layer 140 and the third conductive layer 140A can be formed by the same conductive material layer through the same patterning process.
- the embodiments of the present disclosure include but are not limited to this, and the second conductive layer 140 and the third conductive layer 140A can also be made of different materials and formed through different processes. It should be noted that even if the second conductive layer 140 and the third conductive layer 140A are made of different materials and formed through different processes, the second conductive layer 140 and the third conductive layer 140A can also be located on the side of the substrate layer 110 away from the first conductive layer 120, or on the surface of the substrate layer 110 away from the first conductive layer 120.
- the substrate layer 110 may be a flexible substrate layer 110, and the material of the flexible substrate layer 110 may be polyimide, etc.
- the material of the first conductive layer 120 may be a conductive metal material such as copper, aluminum, silver, etc.; the material of the second conductive layer 140 may also be a conductive metal material such as copper, aluminum, silver, etc.
- the first single-layer region 113A since the first single-layer region 113A includes only one conductive layer (i.e., the first conductive layer 120) and has good bending or curving performance, at least part of the first single-layer region can be used as a bending region; that is, bending or curving can be performed on the first single layer.
- the first double-layer region 113B and the second double-layer region 113C have two conductive layers and can be used as flat regions.
- the second conductive layer 140 of the first double-layer area 113B in the flexible circuit board 100 can not only be used for electromagnetic protection and impedance matching of the signal transmission line 130, but also can be used to achieve other functions.
- the second conductive layer 140 can be provided with a conductive structure to connect with part of the signal transmission lines 130 in the plurality of signal transmission lines 130 to reduce resistance; or, the second conductive layer 140 can be provided with a conductive structure to electrically connect the signal transmission lines 130 transmitting the same signal in the plurality of signal transmission lines 130 to improve the uniformity and stability of the signal.
- the third conductive layer 140A of the second double-layer area 113C in the flexible circuit board 100 provided in the embodiment of the present disclosure can be used not only for electromagnetic protection and impedance matching of the signal transmission line 130, but also for realizing other functions.
- the third conductive layer 140A can be provided with a conductive structure to connect with part of the signal transmission lines 130 in the plurality of signal transmission lines 130 to reduce resistance; or, the third conductive layer 140A can be provided with a conductive structure to electrically connect the signal transmission lines 130 transmitting the same signal in the plurality of signal transmission lines 130 to improve the uniformity and stability of the signal.
- the flexible circuit board can also be bent to form a U-shaped structure, the U-shaped structure includes a first flat portion, a second flat portion and a connecting portion located between the first flat portion and the second flat portion, the connecting portion connects the first flat portion and the second flat portion to semi-enclose a accommodating space; the accommodating space can be used to set the back plate and the backlight module; the backlight module can adopt a side-entry backlight module or a direct-down backlight module.
- the first double-layer area is located in the second flat portion
- the first single-layer area and the second double-layer area are located in the connecting portion
- the second double-layer area is located at the bottom of the connecting portion away from the accommodating space
- the first single-layer area is located between the bottom and the second flat portion.
- the flexible circuit board 100 further includes a second single-layer area 113D and a third single-layer area 113E; the second single-layer area 113D is located between the second double-layer area 113C and the first pad area 111; the third single-layer area 113E is located between the first double-layer area 113B and the second pad area 112.
- the second single-layer area 113D can be used as a bending area between the bottom 232 of the connection portion 230 away from the accommodating space 250 and the second flat portion 220, and the third single-layer area 113E can be used as a transition area between the second pad area 112 and the first double-layer area 113B.
- the first pad region 111 , the second single-layer region 113D, the second double-layer region 113C, the first single-layer region 113A, the first double-layer region 113B, and the third single-layer region 113E are sequentially arranged in the first direction.
- the second double-layer area is a transition area between the two bending areas and can also
- the third conductive layer can be provided with interconnecting wires to connect the signal transmission lines transmitting the same signal in the first conductive layer, thereby improving the uniformity of the signals on these signal transmission lines.
- the flexible circuit board 100 also includes a first protective layer 151, a second protective layer 152 and a first exposure opening 161;
- the first protective layer 151 is located in the transmission line area 113, and is located on the side of the first conductive layer 120 away from the substrate layer 110;
- the second protective layer 152 is located in the first double-layer area 113B, and is located on the side of the second conductive layer 140 away from the substrate layer 110;
- the first exposure opening 161 is located in the second protective layer 152, and is configured to expose the second conductive layer 140, so that the second conductive layer 140 can be connected to an external conductive structure to provide voltage or electrical signals to various conductive structures in the second conductive layer 140.
- the first exposure opening 161 is located at one side of the center of the first double-layer region 113B close to the first single-layer region 113A in the first direction.
- the embodiments of the present disclosure include but are not limited to this, and the first exposure opening can also be set at other positions.
- the flexible circuit board 100 includes a plurality of first exposure openings 161 arranged along a second direction Y intersecting the first direction X.
- the flexible circuit board 100 includes three first exposure openings 161 arranged at intervals along the second direction Y.
- the second conductive layer can have a more uniform potential.
- the flexible circuit board 100 may further include a first adhesive layer 171 and a second adhesive layer 172; the first adhesive layer 171 is located between the first conductive layer 120 and the first protective layer 151; the second adhesive layer 172 is located between the second conductive layer 140 and the second protective layer 152. It should be noted that when the second adhesive layer 172 is provided, the first exposure opening 161 also penetrates the second adhesive layer 172 to expose the second conductive layer 140.
- the flexible circuit board further includes a conductive tape, which contacts the second conductive layer through the first exposed opening, so that the second conductive layer can be grounded. It should be noted that the specific configuration of the conductive tape can be referred to the relevant description of FIG. 5 , which will not be repeated here.
- FIG18 is a schematic plan view of a flexible circuit board provided in accordance with an embodiment of the present disclosure
- FIG19 is a schematic cross-sectional view of a flexible circuit board along line JK in FIG18 provided in accordance with an embodiment of the present disclosure.
- the flexible circuit board 100 includes a substrate layer 110 and a first conductive layer 120; the substrate layer 110 includes a first pad area 111, a second pad area 112, and a transmission line area 113 located between the first pad area 111 and the second pad area 112.
- the first conductive layer 120 is located on the first side of the substrate layer 110, and includes a first pad structure 121, a second pad structure 122 and a plurality of signal transmission lines 130 extending along the first direction; the first pad structure 121 is located in the first pad area 111, the second pad structure 122 is located in the second pad area 112, and the plurality of signal transmission lines 130 are located in the transmission line area 113.
- the transmission line region 113 includes a first single-layer region 113A and a first double-layer region 113B arranged along a first direction X; in the first single-layer region 113A, a first conductive layer 120 is disposed on the first side of the substrate layer 110, and no conductive structure is disposed on the second side of the substrate layer 110; in the first double-layer region 113B, a first conductive layer 120 is disposed on the first side of the substrate layer 110, and a second conductive layer 140 is disposed on the second side of the substrate layer 110, and the second side and the first side are opposite sides of the substrate layer 110.
- the "single layer” or “double layer” in the “single-layer region” and “double-layer region” in the embodiments of the present disclosure refers to the number of conductive layers contained in the corresponding region, and is not used to limit the number of other non-conductive layers.
- the first single-layer area only includes a single conductive layer, so it has good bending performance, and is not prone to breakage and excessive stress. Therefore, by setting the second double-layer area, the first single-layer area and the first double-layer area in the transmission line area, the flexible circuit board can be bent or curved in the first single-layer area, so as to have good bending performance, and can avoid the first single-layer area from generating large stress or breaking.
- the flexible circuit board can also use the second conductive layer in the first double-layer area to perform electromagnetic protection and impedance matching on the signal transmission line, so as to avoid the display being poor due to poor data transmission stability, and can also improve the anti-electromagnetic interference capability and electromagnetic compatibility (EMC performance) of the flexible circuit board, so as to have a wider range of applications and application scenarios.
- the flexible circuit board can also use the third conductive layer in the second double-layer area to perform electromagnetic protection and impedance matching on the signal transmission line, so as to further improve the anti-electromagnetic interference capability and electromagnetic compatibility (EMC performance) of the flexible circuit board.
- the transmission line area 113 further includes a second double-layer area 113C, and the second double-layer area 113C is located on the side of the first single-layer area 113A away from the first double-layer area 113B in the first direction; that is, the first single-layer area 113A is arranged between the first double-layer area 113B and the second double-layer area 113C; in the second double-layer area 113C, the first conductive layer 120 is arranged on the first side of the substrate layer 110, and the third conductive layer 140A is arranged on the second side of the substrate layer 110.
- the flexible circuit board 100 can use other relatively flat parts to set the above-mentioned second double-layer area 113C, so as to use the third conductive layer 140A in the second double-layer area 113C to perform electromagnetic protection and impedance matching on the signal transmission line, thereby avoiding display defects caused by poor data transmission stability, and further improving the anti-electromagnetic interference capability and electromagnetic compatibility (EMC performance) of the flexible circuit board 100.
- the flexible circuit board 100 further includes a second single-layer area 113D and a third single-layer area 113E; the second single-layer area 113D is located between the second double-layer area 113C and the first pad area 111; the third single-layer area 113E is located between the first double-layer area 113B and the second pad area 112.
- the second single-layer area 113D can be used as a bending area between the bottom 232 of the connection portion 230 away from the accommodating space 250 and the second flat portion 220, and the third single-layer area 113E can be used as a transition area between the second pad area 112 and the first double-layer area 113B.
- the first pad region 111 , the second single-layer region 113D, the second double-layer region 113C, the first single-layer region 113A, the first double-layer region 113B, and the third single-layer region 113E are sequentially arranged in the first direction.
- the flexible circuit board 100 also includes a first protective layer 151, a second protective layer 152 and a first exposure opening 161;
- the first protective layer 151 is located in the transmission line area 113, and is located on the side of the first conductive layer 120 away from the substrate layer 110;
- the second protective layer 152 is located in the first double-layer area 113B, and is located on the side of the second conductive layer 140 away from the substrate layer 110;
- the first exposure opening 161 is located in the second protective layer 152, and is configured to expose the second conductive layer 140, so that the second conductive layer 140 can be connected to an external conductive structure to provide voltage or electrical signals to various conductive structures in the second conductive layer 140.
- the flexible circuit board 100 may further include a first adhesive layer 171 and a second adhesive layer 172; the first adhesive layer 171 is located between the first conductive layer 120 and the first protective layer 151; the second adhesive layer 172 is located between the second conductive layer 140 and the second protective layer 152. It should be noted that when the second adhesive layer 172 is provided, the first exposure opening 161 also penetrates the second adhesive layer 172 to expose the second conductive layer 140.
- FIG. 20A is a schematic diagram of the structure of a display device provided by an embodiment of the present disclosure
- FIG. 20B is a partial enlarged view of a display device provided by an embodiment of the present disclosure.
- the display device 500 includes a display panel 300 and the above-mentioned flexible circuit board 100. Since the flexible circuit board has good bending performance and is not prone to breakage and excessive stress. Therefore, the display device using the flexible circuit board can achieve a narrow frame design while avoiding light leakage and Mura caused by excessive tension on the display panel by the flexible circuit board.
- the display device using the flexible circuit board also has strong anti-electromagnetic interference capability and electromagnetic compatibility (EMC performance), thereby having a wider range of applications and application scenarios.
- the display device may be an electronic device with display function such as a mobile phone, a computer, a tablet computer, a television, an electronic picture frame, a navigation system, a vehicle display, a medical display, etc. It should be noted that since the display device also has strong anti-electromagnetic interference capability and electromagnetic compatibility (EMC performance), it has strong stability when used as a vehicle display or a medical display.
- EMC performance electromagnetic compatibility
- the display device 500 further includes a back plate 510 and a driving circuit board 400; the back plate 510 is located on one side of the display panel 300; the driving circuit board 400 is located on the side of the back plate 510 away from the display panel 300, the display panel 300 includes a binding area 310 and a plurality of binding pads 312 located in the binding area 310, the back plate 510 includes a bottom frame 512, the flexible circuit board 100 is bent from the binding area to the side of the back plate 510 away from the display panel 300; the first pad structure 121 is connected to the plurality of binding pads 312, and the second pad structure 122 is connected to the driving circuit board 400.
- the driving circuit board 400 can transmit display data to the display panel 300 through the flexible circuit board 100 to drive the display panel 300 to perform light-emitting display. Furthermore, since the driving circuit board 400 is located on the backlight side of the display panel 300 and the flexible circuit board 100 is bent to connect the display panel 300 and the driving circuit board 400, it does not occupy too much area, thereby achieving a narrow frame design.
- the first double-layer area 113B is located on the side of the back plate away from the display panel 300, and at least part of the first single-layer area 113A is a bending area around the bottom frame 512.
- the first single-layer area 113A of the flexible circuit board 100 can be used as the bending part of the flexible circuit board 100, and the first double-layer area 113B can be the flat part of the flexible circuit board 100 located on the backlight side of the display panel 300.
- the display device can use the flexible circuit board, so that the flexible circuit board has both good bending performance and strong anti-electromagnetic interference performance and electromagnetic compatibility.
- the flexible circuit board 100 uses the first single-layer area 113A as the bending portion, the stress generated in the first single-layer area 113A is relatively small, and will not generate a large pulling force on the binding area of the display panel 300, thereby preventing the backlight under the display panel 300 from being exposed, causing defects such as light leakage and Mura.
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Abstract
Description
Claims (31)
- 一种柔性电路板,包括:基材层,包括第一焊盘区、第二焊盘区和位于所述第一焊盘区和第二焊盘区之间的传输线区;以及第一导电层,位于所述基材层的第一侧,且包括第一焊盘结构、第二焊盘结构和沿第一方向延伸的多条信号传输线,其中,所述第一焊盘结构位于所述第一焊盘区,所述第二焊盘结构位于所述第二焊盘区,所述多条信号传输线位于所述传输线区,所述传输线区包括沿第一方向排列的第一单层区和第一双层区;在所述第一单层区,所述基材层的所述第一侧设置有所述第一导电层,所述基材层的第二侧不设置导电结构,在所述第一双层区,所述基材层所述第一侧设置有所述第一导电层,所述基材层的所述第二侧设置有第二导电层,所述第二侧与所述第一侧为所述基材层的相对的两侧。
- 根据权利要求1所述的柔性电路板,其中,至少部分所述第一单层区为弯折区,至少部分所述第一双层区为平坦区。
- 根据权利要求1所述的柔性电路板,其中,所述传输线区还包括:第二双层区,在所述第一方向上位于所述第一单层区远离所述第一双层区的一侧,其中,在所述第二双层区,所述基材层所述第一侧设置有所述第一导电层,所述基材层的所述第二侧设置有第三导电层。
- 根据权利要求3所述的柔性电路板,其中,所述柔性电路板弯折形成U型结构,所述U型结构包括第一平坦部、第二平坦部和位于所述第一平坦部和所述第二平坦部之间的连接部,所述连接部将所述第一平坦部和所述第二平坦部相连,以半包围一容置空间;至少部分所述第一双层区位于所述第二平坦部,至少部分所述第一单层区和至少部分所述第二双层区位于所述连接部,至少部分所述第二双层区位于所述连接部远离所述容置空间的底部,至少部分所述第一单层区位于所述底部与所述第二平坦部之间。
- 根据权利要求3所述的柔性电路板,其中,所述第三导电层包括第一互连线,沿与所述第一方向相交的第二方向延伸;所述多条信号传输线包括多条第一信号传输线,所述多条第一信号传输线被配置为传输同样的电信号,所述多条第一信号传输线分别与所述第一互连线电性相连。
- 根据权利要求5所述的柔性电路板,其中,所述第一信号传输线被配置传输接地信号。
- 根据权利要求3-6中任一项所述的柔性电路板,其中,所述第二导电层和所述第三导电层同层设置。
- 根据权利要求3-6中任一项所述的柔性电路板,还包括:第二单层区,位于所述第二双层区与所述第一焊盘区之间;以及第三单层区,位于所述第一双层区与所述第二焊盘区之间。
- 根据权利要求1-8中任一项所述的柔性电路板,其中,所述多条信号传输线包括:高频信号传输线,被配置为传输高频信号;以及多条第一地线,其中,所述高频信号传输线在与所述第一方向相交的第二方向上的两侧分别设置有至少一条所述第一地线,在所述第一双层区,所述第二导电层通过穿过所述基材层的第一过孔分别与所述高频信号传输线两侧的所述第一地线相连。
- 根据权利要求9所述的柔性电路板,其中,所述高频信号传输线包括:第一高频信号子线;以及第二高频信号子线,其中,所述第一高频信号子线上的高频信号和所述第二高频信号子线上的高频信号的极性不同。
- 根据权利要求3-6中任一项所述的柔性电路板,其中,所述传输线区还包括:第三双层区,位于所述第一双层区和所述第二双层区之间,且穿过所述第一单层区以分别与所述第一双层区和所述第二双层区相连,其中,所述第一单层区还位于所述第三双层区在第二方向上的两侧,所述第二方向与所述第一方向相交,在所述第三双层区,所述基材层所述第一侧设置有所述第一导电层,所述基材层的所述第二侧设置有第四导电层,所述第二导电层和所述第三导电层通过所述第四导电层相连,且同层设置。
- 根据权利要求11所述的柔性电路板,其中,所述多条信号传输线包括:高频信号传输线,被配置为传输高频信号;以及多条第一地线,其中,所述高频信号传输线从所述第一双层区经过所述第三双层区延伸至所述第二双层区,所述高频信号传输线在与所述第一方向相交的第二方向上的两侧分别设置有至少一条所述第一地线;在所述第一双层区,所述第二导电层通过穿过所述基材层的第一过孔分别与所述高频信号传输线两侧的所述第一地线相连,在所述第三双层区,所述第四导电层通过穿过所述基材层的第二过孔分别与所述高频信号传输线两侧的所述第一地线相连。
- 根据权利要求1-12中任一项所述的柔性电路板,还包括:第一保护层,位于所述传输线区,且位于所述第一导电层远离所述基材层的一侧;第二保护层,位于所述第一双层区,且位于所述第二导电层远离所述基材层的一侧;以及第一暴露开口,位于所述第二保护层之中,并被配置为暴露所述第二导电层。
- 根据权利要求13所述的柔性电路板,还包括:导电胶带,至少部分位于所述第二保护层远离所述第二导电层的一侧,且通过所述第一暴露开口与所述第二导电层接触,其中,所述导电胶带被配置为与接地端相连。
- 根据权利要求13所述的柔性电路板,其中,所述第一暴露开口在所述第一方向上位于所述第一双层区的中心靠近所述第一单层区的一侧。
- 根据权利要求13所述的柔性电路板,其中,所述柔性电路板包括多个所述第一暴露开口,沿与所述第一方向相交的第二方向排列。
- 根据权利要求1-16中任一项所述的柔性电路板,其中,所述多条信号传输线包括第二地线,位于所述多条信号传输线的最外侧;所述第一导电层还包括:导电网格,位于所述第二地线远离所述多条信号传输线的中心的一侧,并 与所述第二地线相连;以及保护线,位于所述导电网格远离所述第二地线的一侧。
- 根据权利要求17所述的柔性电路板,还包括:第一保护层,位于所述传输线区,且位于所述第一导电层远离所述基材层的一侧;第二保护层,位于所述第一双层区,且位于所述第二导电层远离所述基材层的一侧;以及第二暴露开口,位于所述第一保护层之中,并被配置为暴露所述第一导电层,其中,所述第二暴露开口在所述基材层上的正投影与所述第二地线在所述基材层上的正投影和所述导电网格在所述基材层上的正投影分别交叠。
- 根据权利要求18所述的柔性电路板,还包括:第一电磁屏蔽涂层,位于所述第一保护层远离所述第一导电层的一侧,且通过所述第二暴露开口与所述第二地线和所述导电网格接触设置。
- 根据权利要求19所述的柔性电路板,其中,所述第一电磁屏蔽涂层仅位于所述第一双层区。
- 根据权利要求18所述的柔性电路板,还包括:第三暴露开口,位于第二保护层,并被配置为暴露所述第二导电层;以及第二电磁屏蔽涂层,位于所述第二保护层远离所述第二导电层的一侧,且通过所述第三暴露开口与所述第二导电层接触设置。
- 根据权利要求21所述的柔性电路板,其中,所述第三暴露开口在所述基材层上的正投影与所述第二暴露开口在所述基材层上的正投影交叠。
- 根据权利要求1-22中任一项所述的柔性电路板,其中,所述第一焊盘结构包括M个第一导电垫片,所述第二焊盘结构包括M个第二导电垫片;所述多条信号传输线包括第二信号传输线,所述第二信号传输线包括第一端和第二端,所述第二信号传输线的第一端包括P个分支部,所述第二信号传输线的的第二端包括P个分支部;所述第二信号传输线的第一端的所述P个分支部分别与P个所述第一导电垫片相连,所述第二信号传输线的第二端的所述P个分支部分别与P个所述第二导电垫片相连,P为大于等于2,且小于M的正整数。
- 根据权利要求1-22中任一项所述的柔性电路板,其中,所述第一焊 盘结构包括M个第一导电垫片,所述第二焊盘结构包括N个第二导电垫片;所述多条信号传输线包括第三信号传输线,所述第三信号传输线包括第一端和第二端,所述第三信号传输线的第一端包括P个分支部;所述第三信号传输线的第一端的所述P个分支部分别与P个所述第一导电垫片相连,所述第三信号传输线的第二端与一个所述第二导电垫片相连,P为大于等于2,且小于N的正整数,M大于N。
- 根据权利要求1-22中任一项所述的柔性电路板,其中,所述第一焊盘结构包括M个第一导电垫片,所述第二焊盘结构包括Q个第二导电垫片;所述多条信号传输线包括:第四信号传输线,从所述第一焊盘区延伸至所述第一双层区,所述第四信号传输线包括位于所述第一焊盘区的第一端和位于所述第一双层区的第二端;以及第五信号传输线,从所述第一焊盘区经过所述第一双层区延伸至所述第二焊盘区,所述第五信号传输线包括位于所述第一焊盘区的第一端和位于所述第二焊盘区的第二端,其中,所述第二导电层还包括横向传输线,所述横向传输线通过穿过所述基材层的第三过孔与所述第四信号传输线的第二端相连,并通过穿过所述基材层的第四过孔与所述第五信号传输线相连。
- 根据权利要求1-25中任一项所述的柔性电路板,所述基材层为柔性基材层。
- 根据权利要求1-25中任一项所述的柔性电路板,其中,所述第二导电层包括导电金属网格。
- 根据权利要求1-25中任一项所述的柔性电路板,其中,所述第一导电层的材料包括铜,所述第二导电层的材料包括铜。
- 一种显示装置,包括:显示面板;以及根据权利要求1-28中任一项所述的柔性电路板。
- 根据权利要求29所述的显示装置,还包括:背板,位于所述显示面板的一侧;以及驱动电路板,位于所述背板远离所述显示面板的一侧,其中,所述显示面板包括绑定区和位于所述绑定区的多个绑定垫片,所述 背板包括底部边框,所述柔性电路板从所述绑定区弯折至所述背板远离所述显示面板的一侧;所述第一焊盘结构与所述多个绑定垫片相连,所述第二焊盘结构与所述驱动电路板相连。
- 根据权利要求30所述的显示装置,其中,至少部分所述第一双层区位于所述背板远离所述显示面板的一侧,至少部分所述第一单层区为围绕所述底部边框的弯折区。
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2023/085517 WO2024197827A1 (zh) | 2023-03-31 | 2023-03-31 | 柔性电路板和显示装置 |
| US18/730,095 US20260197936A1 (en) | 2023-03-31 | 2023-03-31 | Flexible circuit board and display device |
| CN202380008531.2A CN121621020A (zh) | 2023-03-31 | 2023-03-31 | 柔性电路板和显示装置 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| PCT/CN2023/085517 WO2024197827A1 (zh) | 2023-03-31 | 2023-03-31 | 柔性电路板和显示装置 |
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| WO2024197827A1 true WO2024197827A1 (zh) | 2024-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/CN2023/085517 Ceased WO2024197827A1 (zh) | 2023-03-31 | 2023-03-31 | 柔性电路板和显示装置 |
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| Country | Link |
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| US (1) | US20260197936A1 (zh) |
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| WO (1) | WO2024197827A1 (zh) |
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| JP2014093354A (ja) * | 2012-11-01 | 2014-05-19 | Japan Display Central Co Ltd | フレキシブルプリント基板 |
| CN103889142A (zh) * | 2012-12-21 | 2014-06-25 | 三菱电机株式会社 | 电子设备及柔性印刷电路基板 |
| CN109950272A (zh) * | 2017-12-20 | 2019-06-28 | 上海和辉光电有限公司 | 一种柔性显示面板及终端 |
| CN112562508A (zh) * | 2020-12-03 | 2021-03-26 | 武汉华星光电半导体显示技术有限公司 | 曲面显示面板及显示装置 |
| CN112566363A (zh) * | 2020-12-25 | 2021-03-26 | 京东方科技集团股份有限公司 | 柔性电路板和显示装置 |
| CN216650096U (zh) * | 2021-12-09 | 2022-05-31 | 联想(北京)有限公司 | 一种柔性电路板和电子设备 |
| CN115087194A (zh) * | 2022-07-06 | 2022-09-20 | 京东方科技集团股份有限公司 | 柔性电路板及显示装置 |
-
2023
- 2023-03-31 US US18/730,095 patent/US20260197936A1/en active Pending
- 2023-03-31 WO PCT/CN2023/085517 patent/WO2024197827A1/zh not_active Ceased
- 2023-03-31 CN CN202380008531.2A patent/CN121621020A/zh active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014093354A (ja) * | 2012-11-01 | 2014-05-19 | Japan Display Central Co Ltd | フレキシブルプリント基板 |
| CN103889142A (zh) * | 2012-12-21 | 2014-06-25 | 三菱电机株式会社 | 电子设备及柔性印刷电路基板 |
| CN109950272A (zh) * | 2017-12-20 | 2019-06-28 | 上海和辉光电有限公司 | 一种柔性显示面板及终端 |
| CN112562508A (zh) * | 2020-12-03 | 2021-03-26 | 武汉华星光电半导体显示技术有限公司 | 曲面显示面板及显示装置 |
| CN112566363A (zh) * | 2020-12-25 | 2021-03-26 | 京东方科技集团股份有限公司 | 柔性电路板和显示装置 |
| CN216650096U (zh) * | 2021-12-09 | 2022-05-31 | 联想(北京)有限公司 | 一种柔性电路板和电子设备 |
| CN115087194A (zh) * | 2022-07-06 | 2022-09-20 | 京东方科技集团股份有限公司 | 柔性电路板及显示装置 |
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| US20260197936A1 (en) | 2026-07-09 |
| CN121621020A (zh) | 2026-03-06 |
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