TWI691110B - Flexible display panel - Google Patents

Abstract

A flexible display panel includes a first flexible substrate, a second flexible substrate disposed opposite to the first flexible substrate, a plurality of conductive structures disposed between the first flexible substrate and the second flexible substrate, and an adhesive layer disposed between the first flexible substrate and the second flexible substrate. The first flexible substrate has a display area, a bonding area and a bending area between the display area and the bonding area. The conductive structures are in the bending area. The adhesive layer extends from the display area to the bending area. A second surface of the first flexible substrate in the bonding area is able to bend to a first surface of the first flexible substrate in the display area. A portion of the first flexible substrate in the bending area and the first flexible substrate in the bonding area overlap with the first flexible substrate in the display area. The conductive structures are able to bend to the corresponding first surface and overlap with the display area.

Description

Flexible display panel

The present invention relates to a display panel, and particularly to a flexible display panel.

With the advancement of technology, the display has gradually developed from a rigid flat panel display (FPD) to a flexible display panel. It is known that the manufacturing process of a rigid flat display panel is relatively high, heavy, and easily broken. Therefore, the flexible display panel is the future development focus of the display panel field.

However, the current common flexible display panel often causes stress and damage to its internal components (such as thin film transistors, signal lines, etc.) when it is bent, which leads to the need for large bending of the peripheral area of the flexible display panel The signal lines located in the surrounding area are often easily broken, resulting in the failure of the flexible display panel.

The present invention provides a flexible display panel with good bendability, which can reduce the probability of signal line breakage and improve the quality of the flexible display panel.

The flexible display panel of the present invention includes a first flexible substrate having a display area, a bonding area, and a bending area between the display area and the bonding area, and the second flexible substrate is disposed opposite to the first flexible substrate , A plurality of conductive structures are arranged between the first flexible substrate and the second flexible substrate, and are located in the bending area and the adhesive layer is arranged between the first flexible substrate and the second flexible substrate, and are formed by the display area Extend to the bending zone. The second surface of the first flexible substrate in the bonding area can be bent to the first surface of the first flexible substrate in the display area, so that part of the first flexible substrate in the bending area and the first flexible in the bonding area The substrate overlaps the first flexible substrate in the display area in a direction perpendicular to the first flexible substrate. The conductive structure can be bent to correspond to the first surface and overlap the display area in a direction perpendicular to the first flexible substrate.

Based on the above, in the flexible display panel according to an embodiment of the present invention, after bending, the first flexible substrate and the second flexible substrate located in the bending area can be bent to the first flexible substrate in the overlapping display area Flex substrate. Therefore, under a very small bending radius, the first signal line and the second signal line can be extended into the bending area and the bonding area along the first flexible substrate and the second flexible substrate with good bending ability, thereby reducing The probability of the first signal line and the second signal line breaking. In this way, the size of the bending area can be further reduced without increasing the line width of the signal line, so as to reduce the frame of the flexible display panel and improve the quality of the flexible display panel. In addition, in the display area and the bending area, the first flexible substrate and the second flexible substrate are further joined through an adhesive layer. Therefore, the adhesive layer can further reduce the influence of bending stress on the signal line and reduce the probability of the signal line breaking.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below in conjunction with the accompanying drawings for detailed description as follows.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Throughout the specification, the same reference numerals denote the same elements. It should be understood that when an element such as a layer, film, region, or substrate is referred to as being “on” or “connected to” another element, it can be directly on or connected to the other element, or Intermediate elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. As used herein, "connected" may refer to physical and/or electrical connections. Furthermore, "electrical connection" or "coupling" may be that there are other elements between the two elements.

It should be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, layers, and/or sections, these elements, components, regions, and/or Or part should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Accordingly, "first element", "component", "region", "layer" or "portion" discussed below may be referred to as a second element, component, region, layer or section without departing from the teachings herein.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology and the present invention, and will not be interpreted as idealized or excessive Formal meaning unless explicitly defined as such in this article.

FIG. 1 is a schematic top view of a flexible display panel according to an embodiment of the present invention. For convenience of description and observation, FIG. 1 only schematically shows some components. FIG. 2 is a schematic cross-sectional view of the flexible display panel of FIG. 1 along section line A-A'. 3 is a schematic cross-sectional view of a flexible display panel after bending according to an embodiment of the invention. Please refer to FIGS. 1 and 2. In this embodiment, the flexible display panel 10 includes a first flexible substrate 100, a second flexible substrate 200, a plurality of conductive structures 300 and an adhesive layer 400. The first flexible substrate 100 has a display area 12, a bonding area 16 and a bending area 14 between the display area 12 and the bonding area 16. The second flexible substrate 200 is disposed opposite to the first flexible substrate 100. The conductive structure 300 is disposed between the first flexible substrate 100 and the second flexible substrate 200 and is located in the bending region 14. The adhesive layer 400 is disposed between the first flexible substrate 100 and the second flexible substrate 200, and the adhesive layer 400 extends from the display area 12 to the bending area 14.

In this embodiment, the first flexible substrate 100 is, for example, a pixel array substrate. The first flexible substrate 100 includes a first substrate 110, a plurality of pixel units 140 disposed on the first substrate 110 and located in the display area 12, and a plurality of first signal lines 120 disposed on the first substrate 110 and located in the display area 12 Extend into the bending zone 14. The first substrate 110 includes, for example, a flexible material. For example, the material of the first substrate 110 can be selected from organic polymers, such as: polyimide (PI), polyethylene naphthalate (PEN), and polyethylene terephthalate ( Polyethylene terephthalate (PET), polycarbonate (PC), polyether sulfone (PES) or polyarylate (polyarylate), or other suitable materials, or a combination of at least two of the foregoing. In other embodiments, the first substrate 110 may also have at least one of the following additional functions according to the type of the display panel, for example, a polarization function, a light enhancement function, a light diffusion function, or other suitable functions.

In some embodiments, the thickness of the first substrate 110 is, for example, 10 microns. The Young's coefficient of the first substrate 110 is 5 GPa to 10 GPa. Under the above arrangement, the first substrate 110 has good bending ability and good reliability.

A plurality of pixel units 140 are arranged on the first substrate 110. It is first described here that FIG. 2 only schematically illustrates that a plurality of pixel units 140 are disposed on the first substrate 110 and located in the same film layer with one layer of pixel units 140, and are not intended to limit the embodiments of the present invention. In this embodiment, a plurality of first signal lines 120 are arranged between the pixel unit 140 and the first substrate 110. In some embodiments, an insulating layer or a flat layer may also be provided between the first signal line 120 and the first substrate 110, but the invention is not limited thereto.

The pixel unit 140 may have a single-layer or multi-layer structure, including a plurality of thin-film transistors (not shown) and light-emitting elements (not shown). The thin film transistor is, for example, low temperature poly-Si (LTPS) or amorphous silicon thin-film transistor (a-Si), but the invention is not limited thereto. The thin film transistor includes a gate electrode, a semiconductor channel layer, and a source electrode and a drain electrode (not shown) electrically connected to the semiconductor channel layer. In this embodiment, the semiconductor channel layer includes amorphous silicon, polycrystalline silicon, microcrystalline silicon, single crystal silicon, organic semiconductor materials, oxide semiconductor materials (for example: indium zinc oxide, indium germanium zinc oxide, or other suitable Materials, or a combination of the above), or other suitable materials, or containing dopants in the above materials, or a combination of the above, but the invention is not limited thereto. The gate electrode can be made of metal material, but the invention is not limited to this. According to other embodiments, the gate electrode, the source electrode and the drain electrode can also use other suitable conductive materials. For example: alloys, nitrides of metal materials, oxides of metal materials, oxynitrides of metal materials, or stacked layers of metal materials and other conductive materials.

In this embodiment, the light-emitting element may include a plurality of light-emitting diodes (LEDs). Common light-emitting diodes include organic light-emitting diodes (OLED), micro LEDs, micro LEDs, mini LEDs, and quantum dot light-emitting diodes ( quantum dot). In some embodiments, the light-emitting element may also be a display medium layer containing multiple liquid crystal (LC) molecules, which is not limited in the present invention.

The first signal line 120 is, for example, a data line and a scanning line electrically connected to the thin film transistor. The first signal line 120 generally uses metal materials, but the invention is not limited thereto. According to other embodiments, the first signal line 120 may also use other conductive materials, such as alloys, nitrides of metal materials, and oxides of metal materials , A nitrogen oxide of a metal material, or a stacked layer of a metal material and other conductive materials.

In this embodiment, the second flexible substrate 200 is, for example, a cover plate, a color filter substrate, or a touch substrate. The following embodiments are described by taking the second flexible substrate 200 as a touch substrate as an example. The second flexible substrate 200 includes a second substrate 210, a light shielding layer 240 disposed on the second substrate 210, and a plurality of second signal lines 220 disposed on the second substrate 210 and overlapping the light shielding in a direction perpendicular to the first flexible substrate 100 Layer 240. The second substrate 210 includes, for example, a flexible material. For example, the material of the second substrate 210 may be an organic polymer, such as: polyimide (PI), polyethylene naphthalate (PEN), and polyethylene terephthalate ( Polyethylene terephthalate (PET), polycarbonate (PC), polyether sulfone (PES) or polyarylate (polyarylate), or other suitable materials, or a combination of at least two of the foregoing. In other embodiments, the second substrate 210 may also have at least one of the following additional functions according to the type of the display panel, for example, a polarization function, a light enhancement function, a light diffusion function or other suitable functions.

In some embodiments, the thickness of the second substrate 210 is, for example, 10 microns. The Young's coefficient of the second substrate 210 is 1 GPa to 5 GPa. Under the above-mentioned arrangement, the second substrate 210 has good bending ability and good reliability.

The second substrate 210 is provided with a light shielding layer 240 and a plurality of second signal lines 220. For example, the light shielding layer 240 is located between the second signal line 220 and the second substrate 210. The light shielding layer 240 is, for example, a black matrix (BM). In some embodiments, the material of the light shielding layer 240 includes resin, but the invention is not limited thereto. In other embodiments, the material of the light shielding layer 240 further includes metal, metal compound (such as silver halide), or other suitable materials. In some embodiments, the thickness of the light shielding layer 240 is about 1 micrometer, but the invention is not limited thereto.

The second signal line 220 is, for example, a touch signal line electrically connected to a touch electrode (not shown). In this embodiment, the second signal line 220 can pass from the display area 12, pass through the bending area 14 and extend into the bonding area 16, but the invention is not limited to this. The second signal line 220 generally uses metal materials, but the invention is not limited thereto. According to other embodiments, the second signal line 220 may also use other conductive materials, such as alloys, nitrides of metal materials, and oxides of metal materials , A nitrogen oxide of a metal material, or a stacked layer of a metal material and other conductive materials. The second signal line 220 may also be a single-layer or multi-layer structure. For example, the second signal line 220 may be a titanium/aluminum/titanium multilayer composite structure, which is not limited in the present invention.

It is worth noting that since the light shielding layer 240 is provided between the second signal line 220 and the second substrate 210, the light shielding layer 240 can shield or absorb light (not shown) from the outside and penetrate the second substrate 210. In this way, when the second signal line 220 is a wire made of metal material, light from the outside will not be reflected by the second signal line 220 out of the flexible display panel 10. Therefore, the display quality of the flexible display panel 10 can be improved.

In this embodiment, the second flexible substrate 200 further includes a color filter layer 260. For example, the color filter layer 260 includes a plurality of color filter patterns (not shown), such as a red filter pattern, a blue filter pattern, and a green filter pattern, but the invention is not limited thereto. The material of the color filter layer 260 includes color photoresist, such as acrylic resin, but the invention is not limited thereto. The color filter layer 260 may be located in the display area 12 and extend into the bending area 14.

In this embodiment, the color filter layer 260 is disposed between the second substrate 210 and the second signal line 220. The light shielding layer 240 is disposed between the color filter layer 260 and the second signal line 220. In some embodiments, a gas barrier layer is further included between the second substrate 210 and the color filter layer 260, but the invention is not limited thereto. In other embodiments, an insulating layer or a flat layer may be disposed between the color filter layer 260 and the light-shielding layer 240, but the invention is not limited thereto.

In this embodiment, the first flexible substrate 100 and the second flexible substrate 200 may be paired to form the flexible display panel 10. For example, an adhesive layer 400 is interposed between the first flexible substrate 100 and the second flexible substrate 200. In other words, the adhesive layer 400 can bond the second signal line 220 of the second flexible substrate 200 to the pixel unit 140 of the first flexible substrate 100. In this embodiment, in addition to the adhesive effect, the adhesive layer 400 preferably also has a substantially insulating effect, and may have a single-layer or multi-layer structure. The material of the adhesive layer 400 may be an insulating material, such as acrylic resin, epoxy, glass frit, or other suitable materials, or a combination of the foregoing materials. This is limited. In some embodiments, the thickness of the adhesive layer 400 is, for example, 9 μm to 15 μm. Under the above arrangement, the adhesive layer 400 can provide good structural strength.

In this embodiment, the flexible display panel 10 further includes a functional layer 280 disposed on the surface of the second flexible substrate 200 away from the first flexible substrate 100. For example, the functional layer 280 and the color filter layer 260 may be disposed on opposite surfaces of the second substrate 210, respectively. The functional layer 280 may include a polarizing plate, a diffusion plate, a dual brightness enhancement film (DBEF), and a lenticular film, or a combination of the foregoing, and the invention is not limited thereto.

Referring to FIGS. 1 and 2, the flexible display panel 10 further includes a first support layer 162 and a second support layer 164. The first support layer 162 is disposed on the first surface 111 of the first flexible substrate 100 in the display area 12, and the second support layer 164 is disposed on the second surface 113 of the first flexible substrate 100 in the bonding area 16. In some embodiments, the second support layer 164 may be disposed on the second surface 113 of the first flexible substrate 100 in the bending region 14 and extend into the bonding region 16. The materials of the first support layer 162 and the second support layer 164 are, for example, insulating materials. Under the above arrangement, the first support layer 162 and the second support layer 164 can improve the structural strength and reliability of the flexible display panel 10.

It is worth noting that please refer to FIGS. 2 and 3, the second surface 113 of the first flexible substrate 100 in the bonding area 16 of this embodiment can be bent to the first surface of the first flexible substrate 100 in the display area 12 111, part of the first flexible substrate 100 in the bending region 14 and the first flexible substrate 100 in the bonding region 16 overlap the first flexible substrate in the display region 12 in a direction perpendicular to the first flexible substrate 100 100. In detail, in a direction perpendicular to the first flexible substrate 100 in the display area 12, part of the first flexible substrate 100 in the bending area and the first flexible substrate 100 in the bonding area 16 may overlap the display area The first flexible substrate 100 in 12.

For example, in a direction perpendicular to the first flexible substrate 100, the second flexible substrate 200 of the flexible display panel 10 before bending may overlap the first flexible in the display area 12 and the bending area 14 Substrate 100. When the flexible display panel 10 (shown in FIG. 2) undergoes a bending process (not shown) to form a bent flexible display panel 10 ′ (shown in FIG. 3 ), the second flexible substrate 200 It can also be bent close to the second surface 113 through the adhesive layer 400, so the second flexible substrate 200 and the first flexible substrate 100 located in the bending region 14 adjacent to the bonding region 16 can overlap those located in the display region 12 The first flexible substrate 100. From another perspective, parts of the first flexible substrate 100 and the second flexible substrate 200 may be bent to the back of the first flexible substrate 100.

In this embodiment, the bent flexible display panel 10' has adjacent and overlapping first support layers 162 and second support layers 164 in the display area 12. Specifically, after bending the first flexible substrate 100, the second support layer 164 disposed in the bonding area 16 and part of the bending area 14 is bent close to the first surface 111 of the first flexible substrate 100. Under the above configuration, in the direction perpendicular to the first flexible substrate 100, the first support layer 162 and the second support layer 164 overlap in the display area 12. In this way, the first support layer 162 and the second support layer 164 can improve the structural strength and reliability in the display area 12 without bending.

Referring to FIG. 3, the bending radius of the flexible display panel 10' in the bending region 14 after bending is about 50 microns to 500 microns. Since the flexible display panels 10, 10' include the first flexible substrate 100 and the second flexible substrate 200, and the first flexible substrate 100 and the second flexible substrate 200 located in the bending region 14 can be bent to The first flexible substrate 100 in the display area 12 overlaps. Therefore, under a very small bending radius (a large bending stress will be generated), the first signal line 120 and the second signal line 220 can respectively follow the first flexible substrate 100 and the second flexible substrate with good bending ability 200, extending from the display area 12 into the bending area 14, thereby reducing the probability of the first signal line 120 and the second signal line 220 being disconnected.

In addition, the first flexible substrate 100 and the second flexible substrate 200 are further joined through the adhesive layer 400. In this embodiment, the adhesive layer 400 is disposed on the first flexible substrate 100 or the second flexible substrate 200 over the entire surface, and extends from the display area 12 into the bending area 14, and there will be a part after bending The first flexible substrate 100 overlapping the display area 12. Compared with the conventional display panel in which an adhesive layer is arranged only at the connection area of the display area, the adhesive layer 400 of this embodiment can further reduce the influence of bending stress on the signal lines 120 and 220 and reduce the probability of the signal line being disconnected . In this way, the size of the bending area 14 can be further reduced without increasing the width of the signal lines 120 and 220, so as to reduce the frame of the flexible display panel 10 and 10', and enhance the flexible display panel 10. 10' quality.

It is worth noting that in the display area 12, the neutral axis L1 (for example, the first neutral axis) of the flexible display panels 10, 10' is located in the adhesive layer 400. The vertical distance between the neutral axis L1 and the first substrate 110 is d1. The vertical distance between the neutral axis L1 and the second substrate 210 is d2. The difference between d1 and d2 is between 0.1 and 10 microns. In the bending region 14, the neutral axis L2 (for example, the second neutral axis) of the flexible display panels 10, 10 ′ is located in the adhesive layer 400, and the neutral axis L2 is perpendicular to the first substrate 110 The distance is d3. The vertical distance between the neutral axis L2 and the second substrate 210 is d4. The difference between d3 and d4 is between 0.1 and 10 microns. Under the above configuration, the difference between d1 and d2 or d3 and d4 can be adjusted. For example, the difference can be 0.1 micrometer. In other words, the neutral axes L1, L2 may be located approximately at the center line of the thickness of the flexible display panels 10, 10' in a direction perpendicular to the first flexible substrate 100, and the neutral axes L1, L2 may also be located at the same time The center line of the thickness of the adhesive layer 400 in the direction perpendicular to the first flexible substrate 100. In this way, the user can adjust the positions of the neutral axes L1, L2 according to the requirements, so as to reduce the influence of the stress on the signal lines or components, and provide the flexible display panel 10, 10' with good bendability.

In addition, based on the considerations of flexibility and visibility, the thicknesses of the first flexible substrate 100 and the second flexible substrate 200 in the display area 12 and the bending area 14 can be adjusted according to the needs of users. In order to prevent the components from being affected by stress, users can adjust the difference between d1 and d2 or d3 and d4 according to their needs. In other words, the user can adjust the positions of the neutral axes L1, L2 so that the neutral axes L1, L2 are close to the second substrate 210 or close to the first substrate 110. For example, in the bending region 14, the second signal line 220 of the second flexible substrate 200 on the outer side is subjected to greater bending stress than the first signal line 120 of the first flexible substrate 100 on the inner side . Therefore, the neutral axis L2 can be brought closer to the second substrate 210 by increasing the difference between d3 and d4. As a result, the bending stress on the second signal line 220 can be further reduced, reducing the probability of the second signal line 220 breaking. In other embodiments, by increasing the difference between d1 and d2 in the display area 12, the position of the neutral axis L1 can be adjusted to reduce the bending stress on the signal lines 120 and 220 and reduce the signal line 120, The probability of 220 disconnection.

Referring to FIGS. 1, 2 and 3, the flexible display panels 10, 10' further include an external circuit 500. The external circuit 500 is, for example, a flexible printed circuit board (FPC), a chip-on-film (COF), other suitable circuit unit, or a combination of the above elements. The external circuit 500 is bonded to the first flexible substrate 100 in the bonding area 16. For example, the external circuit 500 may be electrically connected to the first signal line 120 of the first flexible substrate 100 and the third signal line 180 on the first flexible substrate 100 in the bonding area 16. The third signal line 180 generally uses metal materials, but the invention is not limited thereto. According to other embodiments, the third signal line 180 may also use other conductive materials, such as alloys, nitrides of metal materials, and oxides of metal materials , A nitrogen oxide of a metal material, or a stacked layer of a metal material and other conductive materials.

Under the above configuration, after the first flexible substrate 100 is bent, the external circuit 500 can be bent together with the first flexible substrate 100 in the bonding area 16 to the first flexible substrate 100 in the display area 12 back. In this way, the edge size of the flexible display panels 10, 10' can be reduced, and the demand for narrow bezels can be achieved. In addition, since the flexible display panels 10 and 10 ′ have good bending ability, the width of the signal lines 120 and 220 may not be increased, the probability of the signal lines 120 and 220 being disconnected may be reduced, and the size of the bending area 14 may be further reduced , Reduce the frame, improve the quality of the flexible display panel 10, 10'.

In this embodiment, the first flexible substrate 100 has a connecting portion 18 in the bending region 14. A plurality of conductive structures 300 are located in the connection portion 18 in the bending region 14. These conductive structures 300 can electrically connect the second signal line 220 to the external circuit 500. For example, the conductive structure 300 may electrically connect the second signal line 220 to the third signal line 180 to connect to the external circuit 500. The conductive structure 300 includes a metal ball 310 and an insulating layer 320. The metal ball 310 is, for example, a ball plated with a metal layer on a resin ball, or a ball formed of a metal or an alloy, and the invention is not limited thereto.

It is worth noting that after the first flexible substrate 100 is bent, the conductive structure 300 in the connecting portion 18 can be bent to correspond to the first surface 111 and in the direction of the first flexible substrate 100 in the vertical display area 12 Above, the connection portion 18 may overlap the display area 12, and the conductive structure 300 in the connection portion 18 overlaps the first flexible substrate 100 in the display area 12. Under the above arrangement, the conductive structure 300 can transmit the signal (eg, touch signal) of the second signal line 220 of the second flexible substrate 200 to the third signal line 180 of the first flexible substrate 100. The third signal line 180 is electrically connected to the external circuit 500. In this way, the flexible display panels 10, 10' can achieve the signal concentration to the external circuit 500 connected to the first flexible substrate 100. In this way, in addition to omitting additional external circuits on the second flexible substrate 200, to simplify the manufacturing process and save costs, the flexible display panel 10, 10' can be further thinned, and the flexible display panel 10 can be improved. 10' bending capacity.

In summary, in the flexible display panel according to an embodiment of the present invention, after bending, the first flexible substrate and the second flexible substrate located in the bending area can be bent to the first in the overlapping display area A flexible substrate. Therefore, under a very small bending radius, the first signal line and the second signal line can extend from the display area into the bending area and join along the first flexible substrate and the second flexible substrate with good bending ability, respectively Area, thereby reducing the probability of disconnection of the first signal line and the second signal line. In this way, the size of the bending area can be further reduced without increasing the line width of the signal line, so as to reduce the frame of the flexible display panel and improve the quality of the flexible display panel. In addition, in the display area and the bending area, the first flexible substrate and the second flexible substrate are further joined through an adhesive layer. Compared with the conventional display panel in which the adhesive layer is arranged only at the connection area of the display area, the adhesive layer can further reduce the influence of the bending stress on the signal line and reduce the probability of the signal line breaking. In addition, the neutral axis can be adjusted to be located at the midline of the adhesive layer or close to the first substrate or the second substrate. In this way, the signal line subjected to large bending stress during bending can be close to the neutral axis. In this way, the adhesive layer can not only provide good structural strength and bendability of the flexible display panel, but also further reduce the probability of disconnection of the signal line.

In addition, the flexible display panel further includes a plurality of conductive structures electrically connected to external circuits. In this way, the flexible display panel can achieve signal concentration, so as to save the configuration of additional external circuits, simplify the manufacturing process, and save costs, and further thin the flexible display panel to improve the bending capability of the flexible display panel.

In addition, the flexible display panel also has a first support layer and a second support layer. Therefore, the structural strength and reliability of the flexible display panel can be further improved. In addition, when the second signal line is a wire made of metal material, light from the outside can be shielded or absorbed by the shading layer, so the outside light is not reflected by the second signal line out of the flexible display panel. Therefore, the display quality of the flexible display panel can be improved.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

10, 10’: Flexible display panel

12: Display area

14: Bending area

16: junction

18: Connection

100: first flexible substrate

110: first base

111: first surface

113: Second surface

120: the first signal line

140: pixel unit

162: The first support layer

164: Second support layer

180: Third signal line

200: second flexible substrate

210: second base

220: Second signal line

240: shading layer

260: Color filter layer

280: function layer

300: conductive structure

310: Metal ball

320: Insulation

400: Adhesive layer

500: external circuit

A-A’: Section line

d1, d2, d3, d4: vertical distance

L1, L2: neutral axis

FIG. 1 is a schematic top view of a flexible display panel according to an embodiment of the invention. FIG. 2 is a schematic cross-sectional view of the flexible display panel of FIG. 1 along section line A-A'. 3 is a schematic cross-sectional view of a flexible display panel after bending according to an embodiment of the invention.

10: Flexible display panel

12: Display area

14: Bending area

16: junction

18: Connection

100: first flexible substrate

110: first base

111: first surface

113: Second surface

120: the first signal line

140: pixel unit

162: The first support layer

164: Second support layer

180: Third signal line

200: second flexible substrate

210: second base

220: Second signal line

240: shading layer

260: Color filter layer

280: function layer

300: conductive structure

310: Metal ball

320: Insulation

400: Adhesive layer

500: external circuit

A-A’: Section line

d1, d2, d3, d4: vertical distance

L1, L2: neutral axis

Claims (9)

A flexible display panel includes: a first flexible substrate with a display area, a bonding area, and a bending area between the display area and the bonding area; a second flexible substrate, configured in The opposite of the first flexible substrate; a plurality of conductive structures, arranged between the first flexible substrate and the second flexible substrate, and located in the bending area; an adhesive layer, arranged on the first Between the flexible substrate and the second flexible substrate, and extending from the display area to the bending area; and an external circuit, bonded to the first flexible substrate in the bonding area, and perpendicular to the first In the direction of the flexible substrate, the conductive structures overlap the display area in the bending area and are electrically connected to the external circuit, wherein a second surface of the first flexible substrate in the bonding area can be bent to The first flexible substrate is on a first surface of the display area so that part of the first flexible substrate in the bending area and the first flexible substrate in the bonding area are perpendicular to the first flexible substrate The first flexible substrate in the display area is overlapped in the direction of, wherein the conductive structures can be bent to correspond to the first surface, and the display area is overlapped in a direction perpendicular to the first flexible substrate, wherein the The conductive structures are located at a connecting portion in the bending area, and the connecting portion overlaps the display area in a direction perpendicular to the first flexible substrate. The flexible display panel as described in item 1 of the patent application scope, wherein the first flexible substrate includes: A first substrate; a plurality of pixel units arranged on the first substrate and located in the display area; and a plurality of first signal lines arranged on the first substrate and located in the display area and extending into the bend Area. The flexible display panel as described in item 1 of the patent application scope, wherein the second flexible substrate includes: a second substrate; a light-shielding layer disposed on the second substrate; and a plurality of second signal lines, disposed The light shielding layer is overlapped on the second substrate and in a direction perpendicular to the first flexible substrate. The flexible display panel as described in item 3 of the patent application scope, wherein the second flexible substrate further includes: a color filter layer disposed between the second substrate and the second signal lines, and the The light shielding layer is disposed between the color filter layer and the second signal lines. The flexible display panel as described in item 3 of the patent application scope, wherein the conductive structures electrically connect the second signal lines to the external circuit. The flexible display panel as described in item 1 of the patent application range, wherein in the display area, a neutral axis of the flexible display panel is located in the adhesive layer, the neutral axis and the first substrate The vertical distance between them is d1, the vertical distance between the neutral axis and the second substrate is d2, and the difference between d1 and d2 is between 0.1 and 10 microns. The flexible display panel as described in item 1 of the patent scope, wherein in the bending area, a neutral axis of the flexible display panel is located in the adhesive layer, and The vertical distance between the neutral axis and the first substrate is d3, and the vertical distance between the neutral axis and the second substrate is d4, and the difference between d3 and d4 is between 0.1 and 10 microns. The flexible display panel as described in item 1 of the patent application scope further includes a functional layer disposed on the surface of the second flexible substrate away from the first flexible substrate. The flexible display panel as described in item 1 of the patent application scope further includes a first support layer and a second support layer, the first support layer is disposed on the first surface of the display area, the second The supporting layer is disposed on the second surface in the bonding area, and in a direction perpendicular to the first flexible substrate, the first supporting layer and the second supporting layer overlap in the display area.

Images