CN112542091A - Flexible display panel, manufacturing method thereof and display device - Google Patents
Flexible display panel, manufacturing method thereof and display device Download PDFInfo
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- CN112542091A CN112542091A CN202011405796.0A CN202011405796A CN112542091A CN 112542091 A CN112542091 A CN 112542091A CN 202011405796 A CN202011405796 A CN 202011405796A CN 112542091 A CN112542091 A CN 112542091A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000010410 layer Substances 0.000 claims abstract description 304
- 239000000758 substrate Substances 0.000 claims abstract description 140
- 239000002131 composite material Substances 0.000 claims abstract description 84
- 239000012044 organic layer Substances 0.000 claims abstract description 67
- 238000005452 bending Methods 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 21
- 229910052760 oxygen Inorganic materials 0.000 claims description 21
- 239000001301 oxygen Substances 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 230000002093 peripheral effect Effects 0.000 claims description 18
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 16
- 125000006850 spacer group Chemical group 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- 239000003292 glue Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 4
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- HKBLLJHFVVWMTK-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti].[Ti] HKBLLJHFVVWMTK-UHFFFAOYSA-N 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 3
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 23
- 230000009286 beneficial effect Effects 0.000 description 10
- 238000000059 patterning Methods 0.000 description 10
- 238000005530 etching Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000003139 buffering effect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 125000001475 halogen functional group Chemical group 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
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- 230000002349 favourable effect Effects 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- General Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The embodiment of the invention discloses a flexible display panel, a manufacturing method thereof and a display device. The flexible display panel comprises a display substrate and a touch substrate which are arranged in a stacked mode, the touch substrate comprises a touch electrode layer and a composite layer, and the touch electrode layer is used for transmitting touch signals; the composite layer is positioned on one side of the touch electrode layer; the composite layer includes a first organic layer and an inorganic buffer layer disposed in a stacked arrangement. Compared with the prior art, the embodiment of the invention improves the reliability of the touch function and the display function of the flexible display panel.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a flexible display panel, a manufacturing method of the flexible display panel and a display device.
Background
With the continuous development of display technology, the application range of display panels is wider and wider, and the requirements of people on the display panels are higher and higher. Specifically, the requirements for the display panel include not only the display quality of the display panel, the narrow bezel of the display panel, but also the flexible display and touch functions of the display panel, and the like. In the prior art, a flexible display panel with a touch function is realized by attaching a bendable touch substrate to a display substrate. However, when the conventional flexible display panel is used for high-temperature and high-humidity detection, the reliability is poor, and the touch function and the display function of the flexible display panel are affected.
Disclosure of Invention
The embodiment of the invention provides a flexible display panel, a manufacturing method thereof and a display device, which are used for improving the reliability of a touch function and a display function of the flexible display panel.
In order to achieve the technical purpose, the embodiment of the invention provides the following technical scheme:
a flexible display panel comprises a display substrate and a touch substrate which are arranged in a stacked mode, wherein the touch substrate comprises:
the touch electrode layer is used for transmitting a touch signal;
the composite layer is positioned on one side of the touch electrode layer; the composite layer includes a first organic layer and an inorganic buffer layer disposed in a stacked arrangement.
Further, the inorganic buffer layer further comprises a plurality of openings for discharging water and oxygen;
optionally, the shape of the aperture comprises: circular, triangular, rectangular, trapezoidal, or combinations thereof.
Further, the display substrate comprises a plurality of pixels, and pixel space regions exist among the pixels; the touch substrate is positioned on the light emergent side of the display substrate, and the orthographic projection of the opening on the display substrate is positioned in the pixel interval area;
optionally, the size of the opening is smaller than the size of the pixel spacer;
optionally, the touch electrode layer includes a plurality of touch electrode blocks, the touch electrode blocks are in a grid shape, and an orthographic projection of the touch electrode blocks on the display substrate is located in the pixel spacing area.
Further, the touch electrode layer comprises a plurality of touch electrode blocks, and touch spacers are arranged among the touch electrode blocks; the orthographic projection of the opening on the touch electrode layer is positioned in the touch spacer region;
optionally, the size of the opening is smaller than that of the touch spacer.
Further, the inorganic buffer layer is located between the first organic layer and the touch electrode layer;
or, the first organic layer is located between the inorganic buffer layer and the touch electrode layer.
Furthermore, the composite layer is positioned on one side of the touch electrode layer close to the display substrate;
optionally, the flexible display panel comprises a display region and a peripheral region, the composite layer being located in the display region and the peripheral region; the touch electrode layer extends from the display area to the peripheral area, and a bonding pad of the peripheral area and the touch electrode layer are arranged on the same layer;
optionally, the touch substrate further includes a second organic layer, where the second organic layer is located on a side of the touch electrode layer away from the display substrate;
optionally, the flexible display panel further includes a bending region, and the bending region is located in the peripheral region; and the part of the touch electrode layer corresponding to the bending region is multiplexed with the metal layer of the display substrate.
Further, the flexible display panel comprises a display area and a peripheral area, and the composite layer is located in the display area;
optionally, the composite layer is located on one side of the touch electrode layer close to the display substrate; or the composite layer is positioned on one side of the touch electrode layer, which is far away from the display substrate.
Furthermore, the touch substrate further comprises a bridge layer, and the bridge layer is located between the touch electrode layer and the display substrate;
the touch electrode layer comprises a plurality of touch electrode blocks, the gap bridge layer comprises gap bridge leads, and the gap bridge leads are used for being connected with the touch electrode blocks in the same row or connected with the touch electrode blocks in the same column;
optionally, the composite layer is disposed on a side of the bridge layer close to the flexible display panel;
optionally, the materials of the touch electrode block and the bridge lead comprise metals;
optionally, the materials of the touch electrode block and the bridge lead comprise titanium aluminum titanium;
optionally, the material of the first organic layer comprises an organic glue;
optionally, the material of the first organic layer comprises an optical organic glue;
optionally, the material of the inorganic buffer layer includes at least one of silicon nitride, silicon oxide, and silicon oxynitride.
Accordingly, the present invention also provides a display device comprising: a flexible display panel according to any embodiment of the invention.
Correspondingly, the invention also provides a manufacturing method of the flexible display panel, which comprises the following steps:
providing a display substrate;
forming a touch substrate on the display substrate;
the touch substrate comprises a touch electrode layer and a composite layer, the touch electrode layer is used for transmitting touch signals, and the composite layer is positioned on one side of the touch electrode layer; the composite layer includes a first organic layer and an inorganic buffer layer disposed in a stacked arrangement.
The method includes the steps that a composite layer is arranged in a touch substrate and comprises a first organic layer and an inorganic buffer layer which are arranged in a stacked mode; in the bending process of the touch substrate, the first organic layer can provide bending buffering for the inorganic buffer layer, so that the inorganic buffer layer is not easy to generate cracks and extend; when carrying out high temperature and high humidity and detecting, inorganic buffer layer can provide the buffering of isolated water oxygen for first organic layer, can promote the isolated water oxygen's of touch-control base plate performance. Therefore, compared with the prior art, the embodiment of the invention improves the performance of isolating water and oxygen of the touch substrate while ensuring that the touch substrate has good bending performance, thereby improving the touch reliability of the touch substrate, the display reliability of the display substrate and the overall reliability of the flexible display panel.
Drawings
Fig. 1 is a schematic top view of a flexible display panel according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;
fig. 3 is a schematic structural diagram formed in each step of a method for manufacturing a flexible display panel according to an embodiment of the present invention;
fig. 4 is a schematic cross-sectional view illustrating another flexible display panel according to an embodiment of the present invention;
fig. 5 is a schematic cross-sectional view illustrating a flexible display panel according to another embodiment of the present invention;
fig. 6 is a schematic cross-sectional view illustrating a flexible display panel according to another embodiment of the present invention;
fig. 7 is a schematic top view of another flexible display panel according to an embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view taken along line B-B of FIG. 7;
fig. 9 is a schematic cross-sectional view illustrating a flexible display panel according to another embodiment of the present invention;
fig. 10 is a schematic cross-sectional view illustrating a flexible display panel according to an embodiment of the present invention;
FIG. 11 is an enlarged view of the area C in FIG. 7;
FIG. 12 is a schematic cross-sectional view taken along line D-D of FIG. 11;
FIG. 13 is an enlarged view of the area E in FIG. 11;
fig. 14 is a schematic top view illustrating a flexible display panel according to an embodiment of the present invention;
fig. 15 is a schematic top view illustrating a flexible display panel according to an embodiment of the present invention;
fig. 16 is a schematic top view illustrating a flexible display panel according to an embodiment of the present invention;
fig. 17 is a schematic top view illustrating a flexible display panel according to an embodiment of the present invention;
fig. 18 is a schematic top view illustrating a flexible display panel according to an embodiment of the present invention;
FIG. 19 is a schematic cross-sectional view taken along line F-F in FIG. 18;
fig. 20 is a schematic structural diagram of another flexible display panel according to an embodiment of the present invention;
fig. 21 is a schematic flow chart illustrating a manufacturing method of a flexible display panel according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the invention provides a flexible display panel, which has a touch function, wherein the touch function comprises the input of information through a finger or a touch pen.
Fig. 1 is a schematic top view of a flexible display panel according to an embodiment of the present invention, and fig. 2 is a schematic cross-sectional view taken along a-a in fig. 1. Referring to fig. 1 and 2, the flexible display panel includes a display substrate 100 and a touch substrate 200, and the touch substrate 200 includes a touch electrode layer 205 and a composite layer. The touch electrode layer 205 is used as a touch sensor of the flexible display panel, and a plurality of touch electrode blocks 210 are disposed on the touch electrode layer 205, and the touch electrode layer 205 can be used for transmitting a touch signal. The composite layer includes a first organic layer 201 and an inorganic buffer layer 202 which are stacked. The composite layer is located on one side of the touch electrode layer 205, and is used for insulating, isolating water and oxygen, protecting and the like the touch electrode layer 205.
The touch electrode layer 205 has conductive performance, and the touch electrode layer 205 is made of metal, preferably titanium aluminum titanium. Matching with the flexible display panel, the touch substrate 200 is a flexible touch substrate. The material of the first organic layer 201 may be, for example, organic glue or the like; preferably, the organic glue is an optical organic glue (OC). The organic layer has good bending performance, and the touch substrate 200 includes the first organic layer 201, which is beneficial to improving the bending performance of the touch substrate 200. However, the first organic layer has a poor effect of isolating water and oxygen, and in the prior art, only the first organic layer is disposed in the touch substrate 200, and when high-temperature and high-humidity detection is performed, the touch electrode layer 205 in the touch substrate 200 is easily corroded and deformed, and a bulge phenomenon is generated, thereby causing poor touch. And, in the case where the touch substrate 200 is bonded to the display substrate 100, water and oxygen in the touch substrate 200 easily intrude into the display substrate 100, causing corrosion of metal in the display substrate 100, and further causing display failure.
Compared with the first organic layer 201, the inorganic buffer layer 202 has better water and oxygen isolation effect and poorer bendability. Illustratively, the material of the inorganic buffer layer 202 is silicon nitride, silicon oxide, silicon oxynitride, or the like. In the prior art, only the inorganic buffer layer is disposed in the touch substrate 200, so that cracks are easily generated in the inorganic buffer layer 202 during the bending process of the touch substrate 200, and the cracks extend under the condition that the upper and lower film layers are both inorganic layers, thereby causing damage to the touch substrate 200.
In the embodiment of the invention, the composite layer arranged in the touch substrate 200 comprises a first organic layer 201 and an inorganic buffer layer 202 which are arranged in a stacked manner; in the bending process of the touch substrate 200, the first organic layer 201 can provide bending buffer for the inorganic buffer layer 202, so that the inorganic buffer layer 202 is not easy to crack and extend; when the high-temperature and high-humidity detection is performed, the inorganic buffer layer 202 can provide a buffer for isolating water and oxygen for the first organic layer 201, so that the performance of isolating water and oxygen of the touch substrate 200 can be improved. Therefore, compared with the prior art, the embodiment of the invention improves the performance of the touch substrate 200 in isolating water and oxygen while ensuring that the touch substrate 200 has good bending performance, thereby improving the touch reliability of the touch substrate 200, the display reliability of the display substrate 100 and the overall reliability of the flexible display panel.
In addition to the above embodiments, there are optionally various ways of disposing the first organic layer 201 and the inorganic buffer layer 202 in the composite layer. For example, the composite layer may be disposed on both sides or one side of the touch electrode layer 205; as another example, the first organic layer 201 may be positioned between the inorganic buffer layer 202 and the touch electrode layer 205, or the inorganic buffer layer 202 may be positioned between the first organic layer 201 and the touch electrode layer 205. Some of these will be specifically described below, but the present invention is not limited thereto.
With continued reference to fig. 2, in an embodiment of the invention, optionally, the composite layer is disposed on a side of the touch electrode layer 205 close to the display substrate 100, that is, the composite layer is disposed between the touch electrode layer 205 and the display substrate 100. And the inorganic buffer layer 202 is located between the first organic layer 201 and the touch electrode layer 205, that is, the inorganic buffer layer 202 is located on a side of the first organic layer 201 close to the touch electrode layer 205.
Referring to the structure of the flexible display panel shown in fig. 2, fig. 3 is a schematic structural diagram formed in each step of a manufacturing method of the flexible display panel according to an embodiment of the present invention. Referring to fig. 3, the manufacturing method of the flexible display panel exemplarily includes: first, a display substrate 100 is provided; then, sequentially forming a first organic layer 201 and an inorganic buffer layer 202 on the display substrate 100, wherein the first organic layer 201 and the inorganic buffer layer 202 form a composite layer; then, a touch electrode layer 205 is formed on the composite layer; finally, a second organic layer 205 is formed on the touch electrode layer 205.
In the process of forming the touch electrode layer 205, a patterning process such as an etching process needs to be performed on the touch electrode layer 205 to form a touch electrode block. In the prior art, the touch electrode layer 205 is directly formed on the organic layer, and due to poor structural matching between the organic layer and the touch electrode layer 205, the patterning effect of the touch electrode layer 205 is poor, etching is incomplete, and the touch electrode layer 205 has a risk of short circuit failure. According to the embodiment of the invention, the touch electrode layer is formed on the composite layer, so that the composite layer is matched with the film layer structure of the touch electrode layer 205 and the process is compatible, the patterning effect of the touch electrode layer 205 is better, the risk of short circuit failure of the touch electrode layer 205 is favorably avoided, and the reliability of the flexible display panel is further improved.
Fig. 4 is a schematic cross-sectional structure diagram of another flexible display panel according to an embodiment of the present invention. Referring to fig. 4, in an embodiment of the invention, optionally, the first organic layer 201 is located between the inorganic buffer layer 202 and the touch electrode layer 205, that is, the inorganic buffer layer 202 is located on a side of the first organic layer 201 away from the touch electrode layer 205. Compared with the prior art, the first organic layer 201 and the touch electrode layer 205 are sequentially formed on the inorganic buffer layer 202, and due to the effect of the inorganic buffer layer 202, the composite layer is matched with the film structure of the touch electrode layer 205, and the process is compatible. Similar to fig. 2, the patterning effect of the touch electrode layer 205 according to the embodiment of the present invention is also good, which is beneficial to avoiding the risk of short circuit failure of the touch electrode layer 205, thereby further improving the reliability of the flexible display panel.
Fig. 5 is a schematic cross-sectional view illustrating a flexible display panel according to another embodiment of the present invention. Referring to fig. 5, in one embodiment of the present invention, the composite layer optionally includes two first organic layers 201 and one inorganic buffer layer 202, and the inorganic buffer layer 202 is located between the two first organic layers 201. Similar to the foregoing embodiments, the provision of the composite layer including two first organic layers 201 and one inorganic buffer layer 202 is also beneficial to the patterning effect of the touch electrode layer 205, and improves the reliability of the flexible display panel.
Fig. 6 is a schematic cross-sectional view illustrating a flexible display panel according to another embodiment of the present invention. Referring to fig. 6, in one embodiment of the present invention, the composite layer optionally includes one first organic layer 201 and two inorganic buffer layers 202, and the first organic layer 201 is located between the two inorganic buffer layers 202. Similar to the foregoing embodiments, the provision of the composite layer including the first organic layer 201 and the two inorganic buffer layers 202 is also beneficial to the patterning effect of the touch electrode layer 205, and improves the reliability of the flexible display panel.
In the above embodiments, the touch substrate 200 is exemplarily shown as a self-contained touch substrate, and is not limited to the invention. In other embodiments, the touch substrate 200 may be a mutual-capacitive touch substrate. Compared with a self-contained touch substrate, the mutual-contained touch substrate has a larger number of film layers, and accordingly, the composite layer is arranged in a larger number of positions in the touch substrate 200. Some of these are described below, but the present invention is not limited thereto.
Fig. 7 is a schematic top view of another flexible display panel according to an embodiment of the present invention, and fig. 8 is a schematic cross-sectional view taken along B-B in fig. 7. Referring to fig. 7 and 8, in an embodiment of the invention, optionally, the touch substrate 200 further includes a bridge layer 206, and the bridge layer 206 is located between the touch electrode layer 205 and the display substrate 100. The touch electrode layer 205 includes a plurality of touch electrode blocks 210, the bridge layer 206 includes a bridge lead 220, and the bridge lead 220 is used to connect the touch electrode blocks 210 in the same row, or the bridge lead 220 is used to connect the touch electrode blocks 210 in the same column. The composite layer is disposed on a side of the bridge layer 206 close to the flexible display panel, that is, the composite layer is disposed between the bridge layer 206 and the display substrate 100. Thus, the bridge layer 206 and the touch electrode layer 205 can be sequentially formed on the composite layer, which is not only beneficial to matching and process compatibility of the bridge layer 206 and the composite layer structure, but also beneficial to matching and process compatibility of the touch electrode layer 205 and the composite layer structure, and improves the patterning effect of the touch electrode layer 205. Meanwhile, the composite layer is arranged to block water and oxygen in the touch substrate 200 from entering the display substrate 100.
Fig. 9 is a schematic cross-sectional view of another flexible display panel according to an embodiment of the present invention. Referring to fig. 9, in an embodiment of the present invention, optionally, the composite layer is disposed on a side of the bridge layer 206 away from the flexible display panel, that is, the composite layer is disposed between the bridge layer 206 and the touch electrode layer 205. Therefore, the composite layer is formed on the bridge layer 206, and the touch electrode layer 205 is formed on the composite layer, so that on one hand, matching and process compatibility between the touch electrode layer 205 and the composite layer are facilitated, and the patterning effect of the touch electrode layer 205 is improved; on the other hand, the composite layer is advantageous in blocking water and oxygen from invading into the bridge layer 206 and the display substrate 100.
Fig. 10 is a schematic cross-sectional view illustrating a flexible display panel according to another embodiment of the present invention. Referring to fig. 10, in an embodiment of the present invention, optionally, the composite layer is disposed on a side of the bridge layer 206 close to the flexible display panel, that is, the composite layer is disposed between the bridge layer 206 and the display substrate 100. Specifically, the underlying composite layer includes a first organic layer 201 and an inorganic buffer layer 202. And the composite layer is disposed on a side of the bridge layer 206 away from the flexible display panel, that is, the composite layer is disposed between the bridge layer 206 and the touch electrode layer 205. Specifically, the composite layer located at the upper layer includes a first organic layer 203 and an inorganic buffer layer 207. By the arrangement, the gap bridge layer 206 is matched with the composite layer structure and compatible in process, the touch electrode layer 205 is matched with the composite layer structure and compatible in process, and the patterning effect of the touch electrode layer 205 is improved. Meanwhile, the composite layer is provided to block water and oxygen from invading into the bridge layer 206 and the display substrate 100.
In addition to the above embodiments, optionally, the inorganic buffer layer 202 further includes a plurality of openings, and the following describes the arrangement of the openings by taking the mutually compatible touch substrate 200 as an example, but the invention is not limited thereto.
Fig. 11 is an enlarged structural view of a region C in fig. 7, and fig. 12 is a sectional structural view taken along D-D in fig. 11. Referring to fig. 11 and 12, in an embodiment of the present invention, the inorganic buffer layer 202 may further include a plurality of openings 230, and the openings 230 may be used to discharge water and oxygen. In addition, compared to the inorganic buffer layer 202, the organic layers such as the first organic layer 201 in the touch substrate 200 contain more moisture before curing, and moisture is generated during the curing process. In the embodiment of the invention, the opening 230 is formed in the inorganic buffer layer 202, so that moisture generated in the curing process of the organic layers such as the first organic layer 201 can be discharged through the opening 230, and the moisture is prevented from being blocked in the touch substrate 200, thereby further improving the reliability of the flexible display panel.
Fig. 13 is an enlarged structural view of a region E in fig. 11. Referring to fig. 13, in an embodiment of the present invention, optionally, the display substrate 100 includes a plurality of pixels 110, and a pixel interval area exists between the pixels 110; the touch substrate 200 is located on the light-emitting side of the display substrate 100, and the orthographic projection of the opening 230 on the display substrate 100 is located in the pixel space. Since the touch substrate 200 is located on the light-emitting side of the display substrate 100, the arrangement manner of the film layers on the touch substrate 200 may generate shielding, interference, diffraction, and other influences on the display of the display substrate 100. In the embodiment of the present invention, the orthographic projection of the opening 230 on the display substrate 100 is located in the pixel spacer, which is equivalent to avoiding the light exit area of the display substrate 100, and is beneficial to avoiding the poor display phenomena such as chromatic aberration, halo or moire of the flexible display panel caused by the opening 230.
With continued reference to fig. 13, based on the above embodiment, the size of the opening 230 is optionally smaller than the size of the pixel spacer to further suppress the flexible display panel from displaying undesirable phenomena such as color difference, halo or moire.
With reference to fig. 11 and 13, in an embodiment of the present invention, optionally, the touch electrode blocks 210 are in a grid shape, and an orthographic projection of the touch electrode blocks 210 on the display substrate 100 is located in the pixel spacing area. By the arrangement of the embodiment of the invention, not only can adverse effects of the opening 230 on display be inhibited, but also adverse effects of the touch electrode block 210 on display can be inhibited, and the display effect of the flexible display panel is further improved.
With reference to fig. 11-13, in an embodiment of the present invention, optionally, a touch spacer is present between the touch electrode blocks 210; the orthographic projection of the opening 230 on the touch electrode layer 205 is located in the touch space region. By such arrangement, in other words, the touch electrode block 210 is not overlapped with the opening 230, so that the film layer of the inorganic buffer layer 202 corresponding to the touch electrode block 210 is uniform, and the electric signal on the touch electrode block 210 is uniform, thereby being beneficial to avoiding the influence of the arrangement of the opening 230 on the touch effect.
On the basis of the above embodiments, optionally, the size of the opening 230 is smaller than the size of the touch spacer, so as to further avoid the influence of the arrangement of the opening 230 on the touch effect.
In the above embodiments, the shape of the opening 230 is set in various ways, for example, as shown in fig. 13, the shape of the opening 230 is circular; for another example, as shown in FIG. 14, the shape of the opening 230 is triangular; as another example, as shown in fig. 15, the opening 230 has a rectangular shape; as another example, as shown in fig. 16, the shape of the opening 230 is trapezoidal; as shown in fig. 17, the openings 230 are rectangular in combination to form a cross. In practical applications, the shape of the opening 230 may be defined according to the arrangement of the pixels 110 and the arrangement of the touch electrode block 210, so that the opening 230 can ensure that the flexible display panel has good display effect and touch effect on the basis of discharging water and oxygen.
In addition to the above embodiments, there are various alternative ways of arranging the coverage area of the composite layer, and some of them will be described below, but the present invention is not limited thereto.
Fig. 18 is a schematic top view of a flexible display panel according to an embodiment of the present invention, and fig. 19 is a schematic cross-sectional view taken along F-F in fig. 18. Referring to fig. 18 and 19, in one embodiment of the present invention, the flexible display panel optionally includes a display region 11 and a peripheral region 12, and the composite layer is located in the display region 11 and the peripheral region 12. The touch electrode layer 205 extends from the display area 11 to the peripheral area 12, and the bonding pad 101 of the peripheral area 12 is disposed on the same layer as the touch electrode layer 205. The embodiment of the invention is arranged in such a way, so that the touch electrode layer 205 is favorable for transmitting touch signals through the bonding pad 101, and the display driving module and the touch driving module are integrated on a flexible circuit board, thereby forming the on-cell type flexible display panel.
The composite layer is located on a side of the touch electrode layer 205 close to the display substrate 100, but not on a side of the touch electrode layer 205 away from the display substrate 100. The reason for this is that if a composite layer is formed on the touch electrode layer 205, which is equivalent to forming a composite layer on the bonding pad 101, in the subsequent process, in order to expose the bonding pad 101 for bonding the flexible circuit board, an etching process needs to be performed on the composite layer covering the bonding pad 101. However, etching the inorganic buffer layer 202 in the composite layer tends to generate etching residue, which affects the bonding effect of the bonding pad 101. Therefore, in the embodiment of the invention, the composite layer is disposed on the side of the touch electrode layer 205 close to the display substrate 100, which is beneficial to avoiding the influence of the composite layer on the bonding pad 101 and improving the bonding effect of the bonding pad 101.
With continued reference to fig. 19, in an embodiment of the invention, optionally, the touch substrate 200 further includes a second organic layer 204, and the second organic layer 204 is located on a side of the touch electrode layer 205 away from the display substrate 100. In this way, in the manufacturing process, the second organic layer 204 is only covered on the bonding pad 101, and on one hand, the second organic layer 204 plays a role in insulating and protecting the touch electrode layer 205; on the other hand, second organic layer 204 is less likely to cause etching residue on bond pad 101.
With reference to fig. 18 and 19, in an embodiment of the present invention, optionally, the flexible display panel further includes a bending region 13, where the bending region 13 is located in the peripheral region 12; the portion of the touch electrode layer 205 corresponding to the bending region is multiplexed with the metal layer 102 of the display substrate 100. Wherein, the end of the corresponding bending region 13 far away from the display region 11 is used for bending to the back of the flexible display panel, so as to realize the COP bending scheme of the flexible display panel. The metal layer 102 of the display substrate 100 includes a plurality of layers, for example, a first metal layer for providing a gate, a second metal layer for providing a capacitor, a third metal layer for providing a source/drain, a fourth metal layer for auxiliary wiring, and the like. In the embodiment of the present invention, the film layer for multiplexing as the touch electrode layer 205 may be a third metal layer or a fourth metal layer closer to the touch substrate 200, so as to facilitate punching and wiring of the display substrate 100. In addition, in the embodiment of the invention, the portion of the touch electrode layer 205 corresponding to the bending region is arranged to be multiplexed with the metal layer 102 of the display substrate 100, so that the thickness of the metal layer in the bending region 13 can be reduced, thereby improving the bending effect, preventing the flexible display panel from being broken during the bending process, and further improving the reliability of the flexible display panel.
Fig. 20 is a schematic structural diagram of another flexible display panel according to an embodiment of the present invention. Referring to fig. 20, in one embodiment of the present invention, the flexible display panel optionally includes a display region 11 and a peripheral region 12, and the composite layer is located in the display region 11. The embodiment of the invention is arranged in such a way that the position of the film layer of the composite layer in the flexible display panel is not limited, and the composite layer can be arranged on one side of the touch electrode layer 205 close to the display substrate 100 or on one side of the touch electrode layer 205 far from the display substrate 100.
It should be noted that, in the above embodiments, it is exemplarily shown that the touch substrate 200 may be located on the light emitting side of the display substrate 100, which is not a limitation of the present invention. In other embodiments, the touch substrate 200 may be disposed on the non-light-emitting side of the display substrate 100, and may be set as needed in practical applications.
In summary, the embodiment of the invention provides a composite layer in the touch substrate 200, which includes a first organic layer 201 and an inorganic buffer layer 202 stacked together, a touch electrode layer 205 formed on the composite layer, and an opening 230 formed on the inorganic buffer layer 202. In a first aspect, the embodiment of the invention improves the performance of the touch substrate 200 in isolating water and oxygen while ensuring that the touch substrate 200 has good bending performance, so as to improve the touch reliability of the touch substrate 200, the display reliability of the display substrate 100, and the overall reliability of the flexible display panel. In a second aspect, the composite layer is matched with the film layer structure of the touch electrode layer 205, the process is compatible, the patterning effect of the touch electrode layer 205 is good, and the risk of short circuit failure of the touch electrode layer 205 is avoided, so that the reliability of the flexible display panel is further improved. In a third aspect, the opening 230 is formed in the inorganic buffer layer 202, which is beneficial to discharging moisture generated in the curing process of the organic layers such as the first organic layer 201 through the opening 230, so that the moisture is prevented from being blocked inside the touch substrate 200, and thus the reliability of the flexible display panel is further improved.
The embodiment of the invention also provides a display device. The display device comprises the flexible display panel provided by any embodiment of the invention, and the technical principle and the generated effect are similar and are not described in detail.
The embodiment of the invention also provides a manufacturing method of the flexible display panel, and the manufacturing method is suitable for manufacturing the flexible display panel provided by any embodiment of the invention. Fig. 21 is a schematic flow chart illustrating a manufacturing method of a flexible display panel according to an embodiment of the present invention. Referring to fig. 21, the method for manufacturing the flexible display panel includes the following steps:
s110, providing a display substrate;
s120, forming a touch substrate on the display substrate;
the touch substrate comprises a touch electrode layer and a composite layer, the touch electrode layer is used for transmitting a touch signal, and the composite layer is positioned on one side of the touch electrode layer; the composite layer includes a first organic layer and an inorganic buffer layer disposed in a stacked arrangement.
The method includes the steps that a composite layer is arranged in a touch substrate and comprises a first organic layer and an inorganic buffer layer which are arranged in a stacked mode; in the bending process of the touch substrate, the first organic layer can provide bending buffering for the inorganic buffer layer, so that the inorganic buffer layer is not easy to generate cracks and extend; when carrying out high temperature and high humidity and detecting, inorganic buffer layer can provide the buffering of isolated water oxygen for first organic layer, can promote the isolated water oxygen's of touch-control base plate performance. Therefore, compared with the prior art, the embodiment of the invention improves the performance of isolating water and oxygen of the touch substrate while ensuring that the touch substrate has good bending performance, thereby improving the touch reliability of the touch substrate, the display reliability of the display substrate and the overall reliability of the flexible display panel.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The flexible display panel is characterized by comprising a display substrate and a touch substrate which are arranged in a stacked mode, wherein the touch substrate comprises:
the touch electrode layer is used for transmitting a touch signal;
the composite layer is positioned on one side of the touch electrode layer; the composite layer includes a first organic layer and an inorganic buffer layer disposed in a stacked arrangement.
2. The flexible display panel of claim 1, wherein the inorganic buffer layer further comprises a plurality of openings for discharging water oxygen;
optionally, the shape of the aperture comprises: circular, triangular, rectangular, trapezoidal, or combinations thereof.
3. The flexible display panel of claim 2, wherein the display substrate comprises a plurality of pixels with pixel spacers between the pixels; the touch substrate is positioned on the light emergent side of the display substrate, and the orthographic projection of the opening on the display substrate is positioned in the pixel interval area;
optionally, the size of the opening is smaller than the size of the pixel spacer;
optionally, the touch electrode layer includes a plurality of touch electrode blocks, the touch electrode blocks are in a grid shape, and an orthographic projection of the touch electrode blocks on the display substrate is located in the pixel spacing area.
4. The flexible display panel according to claim 2, wherein the touch electrode layer comprises a plurality of touch electrode blocks with a touch spacer therebetween; the orthographic projection of the opening on the touch electrode layer is positioned in the touch spacer region;
optionally, the size of the opening is smaller than that of the touch spacer.
5. The flexible display panel of claim 1, wherein the inorganic buffer layer is between the first organic layer and the touch electrode layer;
or, the first organic layer is located between the inorganic buffer layer and the touch electrode layer.
6. The flexible display panel of claim 1, wherein the composite layer is located on a side of the touch electrode layer close to the display substrate;
optionally, the flexible display panel comprises a display region and a peripheral region, the composite layer being located in the display region and the peripheral region; the touch electrode layer extends from the display area to the peripheral area, and a bonding pad of the peripheral area and the touch electrode layer are arranged on the same layer;
optionally, the touch substrate further includes a second organic layer, where the second organic layer is located on a side of the touch electrode layer away from the display substrate;
optionally, the flexible display panel further includes a bending region, and the bending region is located in the peripheral region; and the part of the touch electrode layer corresponding to the bending region is multiplexed with the metal layer of the display substrate.
7. The flexible display panel of claim 1, wherein the flexible display panel comprises a display region and a peripheral region, and wherein the composite layer is located in the display region;
optionally, the composite layer is located on one side of the touch electrode layer close to the display substrate; or the composite layer is positioned on one side of the touch electrode layer, which is far away from the display substrate.
8. The flexible display panel of claim 1, wherein the touch substrate further comprises a bridge layer between the touch electrode layer and the display substrate;
the touch electrode layer comprises a plurality of touch electrode blocks, the gap bridge layer comprises gap bridge leads, and the gap bridge leads are used for being connected with the touch electrode blocks in the same row or connected with the touch electrode blocks in the same column;
optionally, the composite layer is disposed on a side of the bridge layer close to the flexible display panel;
optionally, the materials of the touch electrode block and the bridge lead comprise metals;
optionally, the materials of the touch electrode block and the bridge lead comprise titanium aluminum titanium;
optionally, the material of the first organic layer comprises an organic glue;
optionally, the material of the first organic layer comprises an optical organic glue;
optionally, the material of the inorganic buffer layer includes at least one of silicon nitride, silicon oxide, and silicon oxynitride.
9. A display device, comprising: the flexible display panel of any one of claims 1-8.
10. A method for manufacturing a flexible display panel is characterized by comprising the following steps:
providing a display substrate;
forming a touch substrate on the display substrate;
the touch substrate comprises a touch electrode layer and a composite layer, the touch electrode layer is used for transmitting touch signals, and the composite layer is positioned on one side of the touch electrode layer; the composite layer includes a first organic layer and an inorganic buffer layer disposed in a stacked arrangement.
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| CN202011405796.0A CN112542091A (en) | 2020-12-02 | 2020-12-02 | Flexible display panel, manufacturing method thereof and display device |
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| CN202011405796.0A CN112542091A (en) | 2020-12-02 | 2020-12-02 | Flexible display panel, manufacturing method thereof and display device |
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Application publication date: 20210323 |