CN108598142B - Flexible display substrate, flexible display panel and flexible display device - Google Patents
Flexible display substrate, flexible display panel and flexible display device Download PDFInfo
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- 238000005452 bending Methods 0.000 claims abstract description 200
- 229910052751 metal Inorganic materials 0.000 claims description 262
- 239000002184 metal Substances 0.000 claims description 262
- 239000011159 matrix material Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 11
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- 238000009432 framing Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000004080 punching Methods 0.000 description 7
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- 239000000463 material Substances 0.000 description 3
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- 230000008859 change Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/131—Interconnections, e.g. wiring lines or terminals
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- H10K77/00—Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
- H10K77/10—Substrates, e.g. flexible substrates
- H10K77/111—Flexible substrates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The application provides a flexible display substrate, a flexible display panel and a flexible display device, wherein the flexible display substrate comprises a substrate, and the substrate comprises a display area and a non-display area; the non-display area sequentially comprises a bending area, a fan-out area and a binding area along the direction of the display area pointing to the non-display area, namely the bending area, the fan-out area and the binding area are included in the frame area of the flexible display substrate, the bending area is located between the display area and the fan-out area and between the binding areas, so that the fan-out area can be bent to the back side of the display substrate through the bending area in the process of realizing narrow framing through the bending area, the frame area only comprises the bending area and does not contain the fan-out area, the width of the frame is further reduced compared with the prior art, and further narrow framing is realized.
Description
Technical Field
The invention relates to the technical field of display, in particular to a flexible display substrate, a flexible display panel and a flexible display device.
Background
Flexible devices are becoming more and more widely used in modern life. Flexible electronic devices, especially flexible display panels, are increasingly receiving attention from people due to their characteristics of being light and thin, bendable or even foldable, and good in mechanical properties. The flexible display panel is usually manufactured on a flexible carrier, and due to the bending characteristic of the flexible display panel, the design that four sides are narrow frames is facilitated.
In the existing flexible display, in order to improve the screen occupation ratio of a display area and reduce the edge width below the display area, an area on a flexible substrate, which is bound with a control chip, is bent to the back of the display area. Namely, the side edge of the flexible display panel binding the control chip is bent towards the rear side of the display surface, so that the narrow frame design of the binding area is realized.
However, in the current flexible display device, even if the region of the flexible substrate to which the control chip is bonded is bent to the back of the display region through the bending region, the area of the frame region is still large, and as the PPI (pixel per inch) of the flexible display device is higher and higher, the number of pixels (pixels) per inch is larger, and the frame region is larger, and the existing narrow frame design method cannot further realize narrow frame.
Disclosure of Invention
In view of this, the present invention provides a flexible display substrate, a flexible display panel and a flexible display device, so as to solve the problem that the frame region of the flexible display substrate in the prior art cannot further realize a narrow frame.
In order to achieve the purpose, the invention provides the following technical scheme:
a flexible display substrate comprising:
the display device comprises a substrate base plate, a display panel and a display panel, wherein the substrate base plate comprises a display area and a non-display area;
the display area comprises a plurality of scanning lines and a plurality of data lines which are formed on the substrate and are arranged in an intersecting and insulating mode, the plurality of scanning lines and the plurality of data lines intersect to define a plurality of sub-pixels which are arranged in a matrix mode, the plurality of sub-pixels comprise a plurality of pixel rows along the extension direction of the scanning lines, the plurality of pixel rows are sequentially arranged along the extension direction of the data lines, the extension direction of the scanning lines is a row direction, the extension direction of the data lines is a column direction, and the row direction is perpendicular to the column direction;
the non-display area comprises a bending area, a fan-out area and a binding area;
the bending area comprises a plurality of bending lines which extend along a first direction and have bending capacity;
the fan-out region comprises a plurality of metal lines;
the metal wire is electrically connected with at least part of the bending wire;
the bending area, the fan-out area and the binding area are sequentially arranged along a first direction, and the first direction is the direction of the display area pointing to the non-display area.
The invention also provides a flexible display panel comprising the flexible display substrate.
In addition, the invention also provides a flexible display device which comprises the flexible display panel.
According to the technical scheme, the flexible display substrate comprises a substrate base plate, wherein the substrate base plate comprises a display area and a non-display area; the non-display area sequentially comprises a bending area, a fan-out area and a binding area along the direction of the display area pointing to the non-display area, namely the bending area, the fan-out area and the binding area of the non-display area of the flexible display substrate provided by the invention are arranged, and the bending area is arranged between the display area and the fan-out area as well as between the binding areas, so that the fan-out area can be bent to the back side of the display substrate through the bending area in the process of realizing the narrow framing through the bending area, and the frame area only comprises the bending area without the fan-out area, thereby further reducing the width of the frame and realizing the further narrow framing compared with the prior art.
The invention also provides a flexible display panel which comprises the flexible display substrate, and the fan-out area can be bent to the back of the display side of the flexible display panel, so that the width of a frame is further reduced, and the narrow frame is realized.
The invention also provides a flexible display device which comprises the flexible display panel, and the fan-out area can be bent to the back of the display side of the flexible display device, so that the width of a frame is further reduced, and the narrow frame is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art top view structure of a flexible display substrate before bending;
fig. 2 is a schematic structural diagram of a flexible display substrate according to an embodiment of the present invention;
FIG. 3 is a schematic view of a sub-pixel arrangement according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a flexible display substrate before bending according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a flexible display substrate according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another flexible display substrate according to an embodiment of the present invention;
FIG. 7 is a schematic view of a first metal wire and a second metal wire connected to a bonding region provided by the present invention;
FIG. 8 is a cross-sectional view taken along line AA' of FIG. 5 according to an embodiment of the present invention;
FIG. 9 is another cross-sectional view taken along line AA' of FIG. 5 in accordance with an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another flexible display substrate before bending according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a flexible display panel according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a flexible display device according to an embodiment of the present invention.
Detailed Description
As described in the background section, in the prior art, even if the region on the flexible substrate, to which the control chip is bonded, is bent to the back of the display region through the bending region, the area of the frame region is still large, and as the PPI of the flexible display device is higher and higher, the frame region becomes larger, and the narrow frame design mode in the prior art cannot further realize narrow frame.
The inventors found that the above problems arise because: referring to fig. 1, fig. 1 is a schematic top view structure of a flexible substrate before being bent in the prior art, in which a flexible display substrate 100 includes a display area (i.e., an AA area in the figure) 01 and a non-display area 02, and as shown in fig. 1, the non-display area 02 includes a fan-out area 021, a bending area 022, a routing area 023 and a binding area 024, the fan-out area 021 is connected to the display area 01, various signal lines in the display area 01 are led out and collected to the bending area 022, materials of the various signal lines in the bending area 022 are converted into bending lines with stronger bending capability, and then the bending lines are connected to the binding area 024 through the routing area 023.
With reference to fig. 1, after bending through the bending region 022, the routing region 023 and the binding region 024 are bent to the back of the display side of the flexible display substrate, and the width of the border region of the flexible display substrate is mainly composed of two parts, such as the width a of the fan-out region 021 and the half width B of the bending region 022 shown in fig. 1. However, the width a of the fan-out region 021 cannot be further reduced, and as the PPI of the display panel is further improved, the number of pixels of the display region 01 is increased, the number of signal lines is increased, and as the distance between the signal lines of the fan-out region 021 is too small, a short circuit phenomenon may be caused, and therefore, the number of the signal lines of the fan-out region 021 is increased, and the width a of the fan-out region 021 must be increased to ensure that the distance between the signal lines of the fan-out region 021 meets the process requirements without short circuit. Thus, as the PPI of the flexible display substrate increases, the width of the frame region becomes larger and larger, and thus, the frame cannot be further narrowed.
Based on this, the present invention provides a flexible display substrate comprising:
the display device comprises a substrate base plate, a display panel and a display panel, wherein the substrate base plate comprises a display area and a non-display area;
the display area comprises a plurality of scanning lines and a plurality of data lines which are formed on the substrate and are arranged in an intersecting and insulating mode, the plurality of scanning lines and the plurality of data lines intersect to define a plurality of sub-pixels which are arranged in a matrix mode, the plurality of sub-pixels comprise a plurality of pixel rows along the extension direction of the scanning lines, the plurality of pixel rows are sequentially arranged along the extension direction of the data lines, the extension direction of the scanning lines is a row direction, the extension direction of the data lines is a column direction, and the row direction is perpendicular to the column direction;
the non-display area comprises a bending area, a fan-out area and a binding area;
the bending area comprises a plurality of bending lines which extend along a first direction and have bending capacity;
the fan-out region comprises a plurality of metal lines;
the metal wire is electrically connected with at least part of the bending wire;
the bending area, the fan-out area and the binding area are sequentially arranged along a first direction, and the first direction is the direction of the display area pointing to the non-display area.
The flexible display substrate comprises a substrate base plate, wherein the substrate base plate comprises a display area and a non-display area; the non-display area sequentially comprises a bending area, a fan-out area and a binding area along the direction of the display area pointing to the non-display area, namely the bending area, the fan-out area and the binding area of the non-display area of the flexible display substrate provided by the invention are arranged, and the bending area is arranged between the display area and the fan-out area as well as between the binding areas, so that the fan-out area can be bent to the back side of the display substrate through the bending area in the process of realizing the narrow framing through the bending area, and the frame area only comprises the bending area without the fan-out area, thereby further reducing the width of the frame and realizing the further narrow framing compared with the prior art.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a flexible display substrate before bending according to the present invention; the flexible display substrate 200 includes: a substrate 20, the substrate 20 including a display area 21 and a non-display area 22.
The display area 21 includes a plurality of scan lines Gate and a plurality of Data lines Data formed on the substrate 20 and crossing each other to be insulated, the plurality of scan lines Gate and the plurality of Data lines Data cross each other to define a plurality of sub-pixels P arranged in a matrix, the plurality of sub-pixels P include a plurality of pixel rows along an extending direction of the scan lines Gate, the plurality of pixel rows are sequentially arranged along an extending direction of the Data lines Data, wherein the extending direction of the scan lines Gate is a row direction X, the extending direction of the Data lines Data is a column direction Y, and the row direction X is perpendicular to the column direction Y.
The non-display region 22 includes a bending region 221, a fan-out region 222, and a binding region 223; bending region 221 includes a plurality of bending lines 2210 extending along first direction F and having bending capability; the fan-out region 222 includes a plurality of metal lines 2220; the metal line 2220 is electrically connected to at least a portion of the bending line 2210.
The bending region 221, the fan-out region 222, and the binding region 223 are sequentially disposed along a first direction F, where the first direction F is a direction in which the display region 21 points to the non-display region 22.
It should be noted that the non-display area in the present invention is an area including the fan-out area, the bending area, and the binding area before the bending area is bent, and after the bending area is bent, a part of the bending area remaining on the display side of the flexible display substrate and an area not used for display other than the display area are formed together, which is referred to as a frame area of the flexible display substrate in the present invention.
In this embodiment, the specific arrangement of the plurality of sub-pixels in the display area is not limited, and optionally, referring to fig. 2, an extending direction Y of the Data lines Data in the display area 21 is parallel to the first direction F, that is, the Data lines Data directly enter the bending area 221 from the display area 21 and are connected to the bending lines 2210 in the bending area 221.
In another embodiment of the present invention, the arrangement of the sub-pixels may be as shown in fig. 3, and fig. 3 is a schematic view of the arrangement of the sub-pixels according to another embodiment of the present invention, wherein an angle between the extending direction Y of the Data lines Data in the display area 21 and the first direction F is 45 °, that is, the arrangement directions of the plurality of sub-pixels are inclined with respect to the first direction F. Since the extending direction Y of the Data lines Data or the scan lines Gate has an angle of 45 ° with the first direction F. After being led out from the display area 21, the Data lines Data or the scan lines Gate are changed by 45 °, and then extended to the bending area 221 to be connected to the bending lines 2210 in the bending area 221. It should be noted that the pixel arrangement and the wiring manner in fig. 3 are only exemplary illustrations, and only the layout of a part of the pixels and the wirings is shown, and the layout arrangement of the pixels and the wirings in a part of the area may be omitted. In other embodiments of the present invention, the sub-pixels may also adopt other arrangement manners, which is not limited in this embodiment.
In the embodiment of the invention, the fan-out area is arranged between the bending area and the binding area, and the bending area is arranged between the fan-out area and the display area, so that the signal wire of the display area directly enters the bending area after being led out, is connected to the fan-out area through the bending wire of the bending area, and is connected to the binding area through the metal wire of the fan-out area. Because the bending area is close to the display area, the fan-out area is positioned on one side of the bending area, which is deviated from the display area, so that after the bending area is bent, the fan-out area can be bent to the back of the display side of the flexible display substrate, the frame area does not contain the fan-out area, and the width of the frame area is further reduced. In addition, even if the area of the fan-out area is continuously increased along with the further improvement of the PPI of the flexible display substrate, the width of the frame area is not affected, and therefore, the flexible display substrate provided by the embodiment of the invention can reduce the width of the frame area of the display device to the greatest extent. And the method is more suitable for flexible display devices with high PPI, and has wider application range.
It should be noted that, in the embodiment of the present invention, a specific implementation manner that the bending region is disposed between the display region and the fan-out region is not limited, and optionally, in an embodiment of the present invention, please refer to fig. 4, and fig. 4 is a schematic structural diagram of a flexible display substrate before bending provided by the embodiment of the present invention; in this embodiment, an example is described in which the extending direction of the data line, i.e., the column direction, is parallel to the first direction, which is not limited in this embodiment. When the pixel column direction is parallel to the first direction, a plurality of signal lines such as data lines or display area scanning lines are directly led out from the display area along the first direction.
Referring to fig. 4, in the embodiment of the invention, the flexible display substrate 300 includes: a substrate base plate 30, the substrate base plate 30 including a display region 31 and a non-display region 32.
The non-display area 32 includes a bending area 321, a fan-out area 322, and a bonding area 323 in sequence along the first direction F. In order to ensure that the display brightness of each column of pixels is equivalent to that of other columns of pixels, the present embodiment further includes a line crossing region 324, where the line crossing region 324 includes a first metal bonding line 3241 and a second metal bonding line 3242 extending along the second direction S and arranged in parallel and in an insulating manner; the first metal wire 3241 is used for electrically connecting a plurality of first power lines together; a second metal wire 3242 for connecting a plurality of second power lines together; wherein the second direction S is perpendicular to the first direction F. In this embodiment, the types of the first power line and the second power line are not limited, and optionally, the flexible display substrate in this embodiment is an OLED display substrate, the first power line includes a high-level metal line for providing a power voltage for the plurality of sub-pixels, the first power line in this embodiment is a generalized high-level metal line, and any metal line that is capable of providing a power voltage signal PVDD for the plurality of sub-pixels and is connected to the first metal line may be referred to as a first power line, and the second power line is a metal line that is provided to a cathode of the OLED panel and transmits a low-level signal PVEE, and may be referred to as a second power line, see fig. 4. In other embodiments of the present invention, the first power line may also be a power line for transmitting a low-level signal PVEE, and the second power line may also be a power line for transmitting a high-level signal PVDD, which is not limited in this embodiment.
It should be noted that the position of the crossover region is not limited in this embodiment, and in an embodiment of the present invention, as shown in fig. 4, the crossover region 324 may be disposed between the bending region 321 and the fan-out region 322. At this time, the bending lines in bending region 321 in the embodiment include a plurality of first bending lines 3211, a plurality of second bending lines 3212, and a plurality of third bending lines 3213; one end of each first bending line 3211 is electrically connected to the high-level power line PVDD in the display area 31 of a row of sub-pixels, and the other end is electrically connected to the first metal wire 3241, that is, the first bending line 3211 in this embodiment is the first power line; one end of each second bending line 3212 is electrically connected to the cathode layer of the OLED panel, and the other end of each second bending line is electrically connected to the second metal wire 3242 through a first wire 3243 insulated from the first metal wire 3241, that is, the first wire 3243 in this embodiment is the second power line; one end of each third bending line 3213 is electrically connected to a signal line such as a data line or a display area scan line of a column of sub-pixels, and the other end is electrically connected to one metal line of the fan-out area 322 through a second crossover line 3244 insulated from the first metal wire 3241 and the second metal wire 3242.
That is, the high-level power line PVDD led out from each column of sub-pixels in the display area is connected to the first metal bonding line 3241 of the cross-line area 324 through the first bending line 3211, the cathode of the OLED panel is electrically connected to the second bending line 3212 through the via hole and then connected to the first cross-line 3243 of the cross-line area 324, and then electrically connected to the second metal bonding line 3242 of the cross-line area 324, so as to transmit the PVEE potential to the cathode of the OLED panel, and the signal line such as the data line or the scan line of the display area led out from each column of sub-pixels is connected to the metal line of the fan-out area 322 through the second cross-line 3244 of the cross-line area 324 through the third bending line 321.
In the present embodiment, the positions of the bending lines, the first metal bonding lines, the second metal bonding lines, the first flying lines and the second flying lines in the flexible display substrate are not limited, and the present invention is within the protection scope as long as the electrical connection relationship and the insulation relationship between the lines can be achieved.
Optionally, in the manufacturing process of the flexible display substrate, the first metal bonding wire 3241, the second metal bonding wire 3242 and the bending wire are formed by using the same metal layer, and in this embodiment, the metal layer used for manufacturing the data line in the display area of the flexible display substrate and the metal layer M2 located on the same layer as the data line may be selected. That is, the third bending line 3213 is located in the same layer as the first metal bonding line 3241 and the second metal bonding line 3242, in order to connect the third bending line 3213 to the fan-out region 322, in this embodiment, a second crossover line 3244 is further disposed on a side of the first metal bonding line 3241 and the second metal bonding line 3242 facing the substrate 30, optionally, the second crossover line 3244 may be formed by a metal layer on a side of the first metal bonding line 3241 and the second metal bonding line 3242 facing the substrate 30, which may be further selected as an M1 or an MC metal layer in this embodiment, and M1 is a metal layer for manufacturing a scan line of the flexible display substrate and a metal layer located in the same layer as the scan line; MC is a plate layer for forming a capacitor in the control circuit of the OLED device; in this embodiment, one end of the second jumper line 3244 is connected to the third meander line 3213, and the other end is connected to one metal line of the fan-out region 322, so as to electrically connect the third meander line 3213 and the metal line of the fan-out region 322.
That is, after the data line of the display area is connected to the crossover area through the bending line in this embodiment, because the first metal line and the second metal line of the crossover area are formed by using the same metal layer as the bending line, the bending line connected to the data line needs to be connected to another metal layer through line change and then enter the fan-out area, and the second crossover line 3244 in this embodiment is formed by another metal layer used in line change.
Similarly, since the second bending line 3212 is located at the same layer as the first metal wire 3241 and the second metal wire 3242, one end of the second bending line 3212 needs to be electrically connected to the second metal wire 3242, which is also implemented by wire-changing connection to other metal layers, such as the anode metal layer RE of the OLED device, where RE is located at the same layer as the anode metal layer of the OLED device.
In order to reduce the number of bending lines in the bending region, optionally, on the basis of the above embodiments, a flexible display substrate is further provided in the embodiments of the present invention, please refer to fig. 5, where fig. 5 is a schematic structural view of a flexible display substrate provided in the embodiments of the present invention; as shown in fig. 5, the flexible display substrate 300 further includes a third metal bonding wire 3247 extending along the second direction S, the third metal bonding wire 3247 is located between the bending region 321 and the display region 31; the third metal bonding wire 3247 is used for electrically connecting power lines, which are located in the display region 31 and transmit the high-level signal PVDD, among the plurality of columns of sub-pixels. Optionally, in this embodiment, the third metal wire 3247 is formed by a technology layer on a side of the bending line away from the substrate.
In this embodiment, the bending lines include a plurality of fourth bending lines 3214, a plurality of fifth bending lines 3215, and a plurality of sixth bending lines 3216; one end of each fourth bending line 3214 is electrically connected to the third metal wire 3247, and the other end is electrically connected to the first metal wire 3241; one end of each fifth bending line 3215 is electrically connected to the cathode of the OLED panel, and the other end is electrically connected to the second metal bonding line 3242 through a third span line 3245 insulated from the first metal bonding line, so as to transmit the PVEE potential to the panel. That is, in this embodiment, the fourth bending line 3214 is the first power line; the third jumper 3245 is the second power line.
It should be noted that the fifth bending line 3215 may be formed by using an M2 metal layer, and the second power line PVEE of the display area is a line led out from the cathode of the OLED on the whole surface and located on the same layer as the cathode of the OLED, in this embodiment, one end of the fifth bending line 3215 is electrically connected to the cathode of the OLED display substrate, and the cathode of the OLED is first electrically connected to the anode layer RE of the OLED through a via hole at the edge of the display area, and then is connected to the M2 metal layer through the via hole. The third crossover 3245 is formed from the OLED anode layer RE metal.
One end of each sixth bending line 3216 is electrically connected to a signal line such as a data line or a display area scan line of a column of sub-pixels, and the other end is electrically connected to one metal line of the fan-out area 322 through a fourth crossover line 3246 insulated from the first metal wire 3241 and the second metal wire 3242; the number of fourth bend lines 3214 is less than the number of fifth bend lines 3215 or sixth bend lines 3216.
It should be noted that, in this embodiment, the number of the fourth meander line 3214 and the fifth meander line 3215 is not limited, because one end of the fourth meander line 3214 is connected to the third metal wire 3247, and the other end is connected to the first metal wire 3241, which is used for transmitting the high-level signal PVDD, and the potential of the high-level signal is the same as that of the high-level power line PVDD; one end of the fifth bending line 3215 is connected to the second metal wire 3242 for transmitting a low level signal PVEE, and the potential of the fifth bending line is the same as the cathode level of the OLED display substrate, so that, in order to minimize the number of the bending lines, optionally, the number of the fourth bending line 3214 and the fifth bending line 3215 may be 1.
However, in the present embodiment, since the currents on the high-level power line PVDD and the low-level power line PVEE are the same, and when one bending line corresponds to the high-level power line PVDD, the impedance is relatively large, which causes a difference in the display luminance of each region of the sub-pixels in the display region, and the impedance is relatively large compared to the impedance of the low-level power line PVEE, so that, in the present embodiment, optionally, the fourth bending line 3214 and the fifth bending line 3215 are both multiple, and more optionally, the number of the fourth bending line 3214 is greater than the number of the fifth bending line 3215. The data lines connected to the sixth bending lines 3216 cannot be shorted by metal bonding lines, so the number of the second bending lines 3216 is the largest.
Because the third metal wire 3247 is disposed, the high-level power lines PVDD led out from the display region are electrically connected together, so that the bending lines corresponding to the high-level power lines PVDD are disposed, which can be reduced as appropriate, thereby enhancing the flexibility of the bending region 321.
In this embodiment, a method for forming the third metal bonding wire is not limited, and optionally, the first metal bonding wire, the second metal bonding wire, and the bending wire are made of the same metal layer, and the third metal bonding wire is made of a metal layer on a side of the bending wire away from the substrate, and may be an anode layer RE of the OLED or an M3 metal layer.
In other embodiments of the present invention, the flexible display substrate is an OLED flexible display substrate, and the third metal bonding line may also be formed by using the same layer of metal as that of the reflective anode layer of the OLED.
Based on the foregoing embodiments, it should be noted that the present invention further provides a flexible display substrate, please refer to fig. 6, where fig. 6 is a schematic structural diagram of another flexible display substrate according to an embodiment of the present invention; as shown in fig. 6, a plurality of third wires formed by the OLED anode layer RE are interconnected to form a fourth metal wire 3245' extending in the second direction S. By forming the integral fourth metal bonding wire 3245 ', the fourth metal bonding wire 3245' is connected with the second metal bonding wire 3242 in parallel, the resistance of the PVEE providing the power supply voltage for the display area sub-pixels can be further reduced, so that the display brightness difference of the sub-pixels in multiple columns is small, and the display is uniform.
Further, the width L1 of the fourth metal bonding wire 3245' in the first direction F is greater than the sum of the widths of the first metal bonding wire 3241 and the second metal bonding wire 3242 in the first direction F. Since the fourth metal wire 3245 'is electrically connected to the second metal wire 3242, the resistance of the fourth metal wire 3245' can equalize the current on the PVEE wire, so that the width of the second metal wire 3242 can be made narrower.
It should be noted that, in this embodiment, the method for manufacturing the first metal line and the second metal line is not limited, and alternatively, the first metal line and the second metal line may be formed by using the same metal layer as the bending line, or may be implemented by using different metal layers. It should be noted that, when the first metal line and the second metal line are made of the same metal layer as the bending line, the metal lines connecting the first metal line and the second metal line to the binding region may be implemented by connecting different metal layers, and refer to fig. 7, where fig. 7 is a schematic diagram of the first metal line and the second metal line connected to the binding region provided by the present invention; the second metal bonding wire is divided into a plurality of second sub-metal bonding wires 3242 ', and then the plurality of second sub-metal bonding wires 3242' are electrically connected together by using metal layers of other layers, which is not limited in this embodiment.
For clearly illustrating the relationship between the metal layers in this embodiment, a schematic cross-sectional view AA' is provided in this embodiment, which takes the structure shown in fig. 7 as an example for illustration, and the third metal bonding line is formed by using a technical layer on the side of the bending line away from the substrate, which may be selected as the anode layer RE of the OLED or the M3 metal layer, which is not limited in this embodiment.
In this embodiment, to clearly illustrate the position relationship of each metal layer, each metal layer is named according to the process in the manufacturing process of each metal layer, and M1 is a metal layer of a scan line for manufacturing a flexible display substrate and a metal layer located on the same layer as the scan line; MC is a plate layer for forming a capacitor in the control circuit of the OLED device; m2 is a metal layer for manufacturing the data line of the flexible display substrate and a metal layer which is positioned at the same layer as the data line; m3 is a metal layer added in the process; the RE layer is a metal layer which is positioned on the same layer as the anode metal layer of the OLED device; the cathode metal layer is a metal layer for manufacturing cathode metal and a metal layer which is positioned on the same layer as the cathode metal. The metal layers are sequentially M1/MC-M2-M3-RE-cathode metal along the direction departing from the substrate base plate.
Referring to fig. 8, fig. 8 is a cross-sectional view taken along line AA' in fig. 5 according to an embodiment of the present invention; the metal lines (not shown) of the fan-out region can be formed by using metal of M1 or MC metal layer; the fifth bending line 3215, the first metal wire 3241 and the second metal wire 3242 are formed by using a metal of M2 metal layer; the third metal bonding wire 3247 is formed by using the metal of the M3 metal layer; the second crossover line 3245 is formed by metal of an RE metal layer, the cathode metal is a bent line formed by a M2 metal layer and connected with the display area, and the leading-out of the low-level potential PVEE of the OLED panel specifically comprises: the cathode metal and the anode metal RE are connected to the display area 31 by punching, and connected to the M3 metal layer by punching, and connected to the M2 metal layer by punching, and electrically connected to the bending line 3215, and the metal layer RE where the second crossover is located is also needed to be crossed in the crossover area 324 and the fan-out area 322, and therefore, the M2 metal layer is needed to be connected to the RE metal layer by punching.
In this embodiment, the punching positions of different metal layers are not defined, optionally, the centers of the projections of the via holes of different layers on the substrate are not overlapped, namely, the via holes of different layers are in a staggered arrangement relationship, and the centers of the via holes of different layers are not on the same straight line, so that the recess at the opening of the via hole can be avoided, and the electric contact is not influenced.
In another embodiment of the present invention, the third metal bonding wire 3247 can also be made of RE metal layer, as shown in fig. 9, the cathode metal is connected to the RE metal layer by punching, and then the third metal bonding wire 3247 is formed by the RE metal layer, and then connected to the fifth bending line 3215 located on the M2 metal layer by punching, so that the crossover is realized in the crossover region 324 and the fan-out region 322 via the metal layer RE where the third crossover wire 3245 is located.
In another embodiment of the present invention, in order to reduce the number of bending lines in the bending region, the line crossing region may be optionally located between the bending region and the display region. As shown in fig. 10, fig. 10 is a schematic structural diagram of another flexible display substrate before bending according to an embodiment of the present invention; cross-line region 324 is located between bending region 321 and display region 31, and the bending lines include a plurality of seventh bending lines 3217, a plurality of eighth bending lines 3218, and a plurality of ninth bending lines 3219.
One end of each seventh bending line 3217 is electrically connected to the first metal wire 3241, and the other end is electrically connected to one metal wire of the fan-out region 322; one end of each eighth meander line 3218 is electrically connected to the second metal wire 3242, and the other end is electrically connected to one metal wire of the fan-out region 322; it should be noted that, since the first metal bonding wire 3241 and the second metal bonding wire 3242 are located on the same layer, in this embodiment, the second metal bonding wire 3242 for transmitting the low-level power supply voltage PVEE is electrically connected to the cathode through a fifth cross wire 3248 insulated from the first metal bonding wire 3241, as shown in fig. 10, that is, in this embodiment, the high-level power line PVDD for transmitting the high-level signal is the first power line, and the fifth cross wire 3248 is the second power line.
One end of each ninth meander line 3219 is electrically connected to the Data line Data of a column of sub-pixels through a sixth jumper 3249 insulated from the first metal wire 3241 and the second metal wire 3242, and the other end is electrically connected to one metal line of the fan-out region 322; the number of seventh bend lines 3217 and the number of eighth bend lines 3218 are both less than the number of ninth bend lines 3219.
That is, the high-level power line PVDD led out from the display area and connected to the columns of pixels is first connected to the first metal wire 3241, then connected to the plurality of metal wires of the fan-out area 322 through the plurality of seventh bending wires 3217, and connected to the control chip (IC) or the control circuit board (PCB) in the bonding area 323 through the plurality of metal wires of the fan-out area 322, so that the number of bending wires electrically connected to the high-level power line PVDD in the bending area 321 can be reduced. Similarly, the cathode layer of the OLED panel is electrically connected to the second metal wire 3242, and then connected to the plurality of metal wires of the fan-out region 322 through the plurality of eighth bending lines 3218, so as to implement the transmission of the low-level power voltage PVEE in the panel, and the plurality of metal wires of the fan-out region 322 are connected to the control chip (IC) or the control circuit board (PCB) in the bonding region 323, so as to reduce the number of bending lines connected to the low-level signal PVEE in the bending region 321.
In this embodiment, the first metal line, the second metal line and the bending line are not limited to be made of metal, and the first metal line, the second metal line and the bending line may be made of the same metal layer. All of the optional materials in this embodiment are formed of M2 metal. The ninth bending line 3219 is located on the same layer as the first metal wire 3241 and the second metal wire 3242, and in this embodiment, referring to fig. 10, the ninth bending line 3219 is further electrically connected to signal lines such as data lines or scan lines of the display area through a sixth jumper 3249.
Finally, it should be noted that, in all the above embodiments of the present invention, the first metal wire, the second metal wire and the bending wire are formed by using an M2 metal layer as an example, because the M2 metal layer in the prior art is generally formed by a Ti/Al/Ti metal laminate, where Al has smaller resistance and better flexibility, and therefore, optionally, the first metal wire, the second metal wire and the bending wire in this embodiment are formed by using an M2 metal layer, and the corresponding crossover wire is implemented by using a metal layer other than the M2 metal layer, so as to be insulated from the first metal wire and the second metal wire.
In other embodiments of the present invention, the OLED anode layer RE may be formed by ITO (indium tin oxide)/Ag/ITO metal stack, and if the bending requirement of the bending line is satisfied, the bending line in the present invention may also be formed by the OLED anode layer RE metal layer, and other overline structures are formed by other metal layers. Of course, if the material of the metal layer M3 newly added in the process meets the bending and resistance requirements of the bending line, the first metal line, the second metal line and the bending line may also be formed by using an M3 metal layer, which is not limited in the present invention. The metal layer where the crossover line is located is determined according to the metal layers where the first metal bonding line and the second metal bonding line are located, and the metal layer where the crossover line is located is within the protection scope of the invention as long as the metal layer can realize the electrical connection between the lines.
Fig. 11 is a schematic structural diagram of a flexible display panel according to an embodiment of the present invention, and referring to fig. 11, the flexible display panel according to the embodiment of the present invention includes the flexible display substrate 1 according to the above embodiment, and may further include an opposite substrate 2 disposed opposite to the flexible display substrate 1, where the opposite substrate 2 may be a cover plate or other encapsulation layer, which is not limited in the embodiment of the present invention.
Fig. 12 is a schematic structural diagram of a flexible display device according to an embodiment of the present invention, and referring to fig. 12, a flexible display device 400 may include the flexible display panel 101 according to any embodiment of the present invention. The flexible display device 400 may be a mobile phone as shown in fig. 12, or may be a computer, a television, an intelligent wearable display device, and the like, which is not limited in this embodiment of the present invention.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (15)
1. A flexible display substrate, comprising:
the display device comprises a substrate base plate, a display panel and a display panel, wherein the substrate base plate comprises a display area and a non-display area;
the display area comprises a plurality of scanning lines and a plurality of data lines which are formed on the substrate and are arranged in an intersecting and insulating mode, the plurality of scanning lines and the plurality of data lines intersect to define a plurality of sub-pixels which are arranged in a matrix mode, the plurality of sub-pixels comprise a plurality of pixel rows along the extension direction of the scanning lines, the plurality of pixel rows are sequentially arranged along the extension direction of the data lines, the extension direction of the scanning lines is a row direction, the extension direction of the data lines is a column direction, and the row direction is perpendicular to the column direction;
the non-display area comprises a bending area, a fan-out area and a binding area;
the bending area comprises a plurality of bending lines which extend along a first direction and have bending capacity;
the fan-out region comprises a plurality of metal lines;
the metal wire is electrically connected with at least part of the bending wire;
the bending area, the fan-out area and the binding area are sequentially arranged along a first direction, and the first direction is a direction in which the display area points to the non-display area;
the metal wire comprises a first metal wire body, a second metal wire body and a wire crossing region, wherein the first metal wire body and the second metal wire body are arranged in parallel and insulated;
the first metal wire is used for electrically connecting a plurality of first power lines together;
the second metal wire is used for electrically connecting a plurality of second power lines together;
wherein the second direction is perpendicular to the first direction.
2. The flexible display substrate of claim 1, wherein the crossover region is located between the bend region and the fan-out region.
3. The flexible display substrate of claim 2, wherein the flexible display substrate is an OLED display substrate; the bending lines comprise a plurality of first bending lines, a plurality of second bending lines and a plurality of third bending lines;
one end of each first bending line is electrically connected with a first power line positioned in the display area in a row of sub-pixels, and the other end of each first bending line is electrically connected with the first metal wire;
one end of each second bending line is electrically connected with the cathode of the OLED display substrate, and the other end of each second bending line is electrically connected with the second metal wire bonding line through a first crossover wire insulated from the first metal wire bonding line;
one end of each third bent line is electrically connected with the data line of one column of sub-pixels, and the other end of each third bent line is electrically connected with one metal line of the fan-out area through a second overline insulated from the first metal bonding line and the second metal bonding line.
4. The flexible display substrate of claim 3, wherein the first metal wire, the second metal wire and the bend line are formed from a same metal layer.
5. The flexible display substrate of claim 2, wherein the flexible display substrate is an OLED display substrate; the flexible display substrate further comprises a third metal bonding wire extending along the second direction, the third metal bonding wire being located between the bending region and the display region;
the third metal wire is used for electrically connecting first power lines positioned in the display area in a plurality of columns of the sub-pixels;
the bending lines comprise a plurality of fourth bending lines, a plurality of fifth bending lines and a plurality of sixth bending lines;
one end of each fourth bending line is electrically connected with the third metal wire bonding, and the other end of each fourth bending line is electrically connected with the first metal wire bonding;
one end of each fifth bending line is electrically connected with the cathode of the OLED display substrate, and the other end of each fifth bending line is electrically connected with the second metal bonding line through a third overline insulated from the first metal bonding line;
one end of each sixth bending line is electrically connected with the data line of one column of sub-pixels, and the other end of each sixth bending line is electrically connected with one metal line of the fan-out area through a fourth crossover line insulated from the first metal wire bonding line and the second metal wire bonding line;
the number of the fourth bending lines is larger than that of the fifth bending lines and smaller than that of the sixth bending lines.
6. The flexible display substrate of claim 5, wherein the first metal wire, the second metal wire and the bend line are formed from a same metal layer, and the third metal wire is formed from a metal layer on a side of the bend line facing away from the substrate.
7. The flexible display substrate of claim 5, wherein a plurality of the third cross wires are connected to form a fourth metal wire extending along the second direction.
8. The flexible display substrate of claim 7, wherein the fourth metal wire has a width in the first direction that is greater than the sum of the widths of the first and second metal wires in the first direction.
9. The flexible display substrate of claim 1, wherein the line crossing region is located between the bending region and the display region.
10. The flexible display substrate of claim 9, wherein the flexible display substrate is an OLED display substrate; the bending lines comprise a plurality of seventh bending lines, a plurality of eighth bending lines and a plurality of ninth bending lines;
one end of each seventh bending line is electrically connected with the first metal wire bonding line, and the other end of each seventh bending line is electrically connected with one metal wire of the fan-out area;
one end of each eighth bending line is electrically connected with the second metal wire bonding line, and the other end of each eighth bending line is electrically connected with one metal wire of the fan-out area;
one end of each ninth bent line is electrically connected with the data lines of the sub-pixels in a column through a sixth jumper wire insulated from the first metal wire and the second metal wire, and the other end of each ninth bent line is electrically connected with one metal line of the fan-out area;
the number of the seventh bending line and the number of the eighth bending line are both smaller than the number of the ninth bending line.
11. The flexible display substrate of claim 10, wherein the first metal line, the second metal line and the bend line are formed from a same metal layer.
12. A flexible display substrate according to any of claims 1-11, wherein the first direction is arranged parallel to the column direction.
13. A flexible display substrate according to any of claims 1-11, wherein the first direction makes an angle of 45 ° with the column direction.
14. A flexible display panel comprising the flexible display substrate according to any one of claims 1 to 13.
15. A flexible display device comprising the flexible display panel according to claim 14.
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| CN201810686768.7A CN108598142B (en) | 2018-06-28 | 2018-06-28 | Flexible display substrate, flexible display panel and flexible display device |
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| CN201810686768.7A CN108598142B (en) | 2018-06-28 | 2018-06-28 | Flexible display substrate, flexible display panel and flexible display device |
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