CN114170902B

CN114170902B - Flexible display panel and slide roll display device

Info

Publication number: CN114170902B
Application number: CN202111462137.5A
Authority: CN
Inventors: 王博
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2021-12-02
Filing date: 2021-12-02
Publication date: 2023-11-10
Anticipated expiration: 2041-12-02
Also published as: CN114170902A

Abstract

A flexible display panel and a slide roll display device are disclosed, which relate to the technical field of display and are used for solving the problem that the flexible display panel is easy to peel between film layers during bending. The flexible display panel is provided with a display area and a non-display area, wherein the non-display area comprises a slide roll extension area positioned at one side of the display area. The flexible display panel includes: a substrate and a plurality of insulating layers on the substrate. At least one insulating layer of the plurality of insulating layers extends from the display area to the slide roll extension area, and the part of the insulating layer positioned in the slide roll extension area is of a ladder-shaped structure; the height of the stepped structure gradually decreases in a direction away from the display area. According to the flexible display panel provided by the disclosure, at least one insulating layer of the multi-layer insulating layers extends from the display area to the slide roll extending area, and the part of the at least one insulating layer, which is positioned in the slide roll extending area, is of a ladder-shaped structure, so that the difference between the display area and the non-display area can be reduced, and the problem that the flexible display panel is easy to peel between film layers during bending is solved.

Description

Flexible display panel and slide roll display device

Technical Field

The disclosure relates to the field of display technologies, and in particular, to a flexible display panel and a slide roll display device.

Background

With the development of flexible display technology, application forms such as a fixed curvature bending screen, a folding screen, a wrist strap, a curled screen and the like are layered endlessly, and new vitality is injected into the design of the flexible display screen.

The roll display technology is another novel display mode after the folding display mode, the roll display technology enables screen expansion to be changed from two display states to multiple display states, in the process that the screen is pulled out of the rotating shaft, the display screen is unfolded like a scroll, the continuity experience of a client cannot be interrupted in the process that the screen is unfolded, fashion sense and science and technology sense are extremely strong, and better vision and use experience are brought to the client.

Disclosure of Invention

The disclosure provides a flexible display panel and a roll display device for improving the problem that peeling easily occurs between film layers when the flexible display panel is bent.

In order to achieve the above object, the present disclosure provides the following technical solutions:

in one aspect, some embodiments of the present disclosure provide a flexible display panel having a display region and a non-display region including a roll extension region located on one side of the display region; the flexible display panel includes: a substrate and a multi-layer insulating layer on the substrate. Wherein a substrate covers the display region and the non-display region; at least one of the plurality of insulating layers extends from the display area to the roll extension area; the part of the at least one insulating layer, which is positioned in the sliding roll extension area, is of a ladder-shaped structure; the height of the step-shaped structure gradually decreases along a first direction, and the first direction points to one end of the sliding roll extending area, which is far away from the display area, from one end of the sliding roll extending area, which is close to the display area.

In some embodiments, the flexible display panel includes: a circuit structure layer positioned on one side of the substrate; a light emitting structure layer positioned on one side of the circuit structure layer away from the substrate; the packaging layer is positioned at one side of the light-emitting structure layer far away from the circuit structure layer; the insulation layer extending to the slide roll extension region comprises a first insulation layer, a second insulation layer and a third insulation layer which are positioned in the circuit structure layer; the first insulating layer, the second insulating layer and the third insulating layer are sequentially far away from the substrate, and the boundaries of the first insulating layer, the second insulating layer and the third insulating layer, which are positioned in the sliding roll extending area, are sequentially close to the display area.

In some embodiments, the distance between the boundary of the first insulating layer at the roll extension and the boundary of the second insulating layer at the roll extension is equal to the distance between the boundary of the second insulating layer at the roll extension and the boundary of the third insulating layer at the roll extension.

In some embodiments, the insulating layer extending to the roll extension further comprises: a fourth insulating layer in the circuit structure layer, the fourth insulating layer being located on a side of the third insulating layer remote from the substrate; wherein the border of the fourth insulating layer located at the roll extension area is closer to the display area than the border of the third insulating layer located at the roll extension area; or, the border of the fourth insulating layer located in the sliding roll extension area is further away from the display area than the border of the first insulating layer located in the sliding roll extension area.

In some embodiments, the first insulating layer is a first gate insulating layer; the second insulating layer is a second gate insulating layer; the third insulating layer is an interlayer dielectric layer; the fourth insulating layer is a passivation layer.

In some embodiments, the circuit structure layer further comprises: at least one flat layer positioned on one side of the fourth insulating layer away from the substrate; the at least one flat layer extends from the display area to the roll extension area, and a boundary of the at least one flat layer located at the roll extension area is further away from the display area than a boundary of the first insulating layer located at the roll extension area.

In some embodiments, the slide roll extension includes: an edge region remote from the display region; in the edge region, the at least one planar layer is in contact with the substrate.

In some embodiments, the light emitting structure layer includes: a pixel defining layer located on a side of the at least one planarization layer away from the substrate; the pixel defining layer extends from the display region to the roll extension region, and a boundary of the pixel defining layer at the roll extension region is farther from the display region than a boundary of the first insulating layer at the roll extension region; within the edge region, the pixel defining layer is in contact with the at least one planarization layer.

In some embodiments, the slide roll extension includes: an edge region remote from the display region; the flexible display panel further includes: at least one blocking block located on the substrate, the at least one blocking block being located in the edge region and being disposed around the stepped structure, respectively.

In some embodiments, the barrier comprises at least one barrier layer, at least a portion of all of the at least one barrier layer being co-located with the at least one planar layer.

In some embodiments, the light emitting structure layer includes: a pixel defining layer located on a side of the at least one planarization layer away from the substrate; the pixel defining layer extends from the display region to the roll extension region, and a boundary of the pixel defining layer at the roll extension region is farther from the display region than a boundary of the first insulating layer at the roll extension region; one of the at least one barrier layer furthest from the substrate is disposed co-layer with the pixel defining layer.

In some embodiments, the substrate comprises: a buffer layer positioned on one side of the first insulating layer away from the second insulating layer; a first barrier layer positioned on one side of the buffer layer away from the first insulating layer; a first substrate positioned on one side of the first barrier layer away from the buffer layer; a second barrier layer located on a side of the first substrate remote from the first barrier layer; and a second substrate positioned on one side of the second barrier layer away from the first substrate; a groove is formed in one side, close to the first insulating layer, of the substrate, and the groove is located in the edge area; the recess extends through at least one of the buffer layer, the first barrier layer, the first substrate, and the second barrier layer; the blocking block is positioned in the groove; the encapsulation layer covers the blocking block and the groove.

In some embodiments, the circuit structure layer includes: a dummy pixel circuit located in the roll extension region; and/or a virtual gate driving circuit located in the slide roll extension region.

In yet another aspect, a flexible display panel is provided having a display area and a non-display area, the non-display area including a roll extension area located on one side of the display area; the flexible display panel includes: a substrate covering the display region and the non-display region; a circuit structure layer positioned on one side of the substrate; a light emitting structure layer positioned on one side of the circuit structure layer away from the substrate; the packaging layer is positioned at one side of the light-emitting structure layer far away from the circuit structure layer; wherein the circuit structure layer comprises a virtual pixel circuit positioned in the slide roll extension area; and/or the circuit structure layer comprises a virtual grid driving circuit positioned in the slide roll extension area.

In still another aspect, there is provided a slide scroll display apparatus including: a spool and a flexible display panel according to any one of the preceding claims, the flexible display panel being in contact with a part of an outer peripheral surface of the spool.

The flexible display panel and the slide roll display device provided by the disclosure have the following beneficial effects:

According to the flexible display panel, as the at least one insulating layer of the multi-layer insulating layers extends from the display area to the slide roll extending area, the part of the at least one insulating layer, which is positioned in the slide roll extending area, is of the ladder-shaped structure, the height of the ladder-shaped structure is gradually reduced along the direction away from the display area, and the difference between the display area and the non-display area can be reduced, so that the problems that when the flexible display panel is bent, stripping and bubble generation are easy to occur between film layers due to the fact that the difference between the display area and the slide roll extending area is large are solved.

The sliding roll display device provided by the disclosure has the same beneficial effects as those of the flexible display panel provided by the technical scheme, and is not described herein.

Drawings

FIG. 1 is a block diagram of a flexible display panel provided in some embodiments of the present disclosure;

FIG. 2 is a cross-sectional block diagram of a flexible display panel provided in some embodiments of the present disclosure;

FIG. 3 is a block diagram of a flexible display panel provided in some embodiments of the present disclosure;

FIG. 4 is a cross-sectional block diagram of another flexible display panel according to some embodiments of the present disclosure;

FIG. 5 is a cross-sectional block diagram of yet another flexible display panel according to some embodiments of the present disclosure;

FIG. 6 is a cross-sectional block diagram of yet another flexible display panel according to some embodiments of the present disclosure;

FIG. 7 is a cross-sectional block diagram of yet another flexible display panel according to some embodiments of the present disclosure;

FIG. 8 is a cross-sectional block diagram of yet another flexible display panel according to some embodiments of the present disclosure;

fig. 9 is a sectional structural view of a partial structure of a roll display device according to some embodiments of the present disclosure.

Detailed Description

The following description of the embodiments of the present disclosure will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by one of ordinary skill in the art based on the embodiments provided by the present disclosure are within the scope of the present disclosure.

Throughout the specification and claims, unless the context requires otherwise, the word "comprise" and its other forms such as the third person referring to the singular form "comprise" and the present word "comprising" are to be construed as open, inclusive meaning, i.e. as "comprising, but not limited to. In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", "some examples", "and the like are intended to indicate that a particular feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first" and "second" are used below for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present disclosure, unless otherwise indicated, the meaning of "a plurality" is two or more.

In describing some embodiments, expressions of "coupled" and "connected" and their derivatives may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other. As another example, the term "coupled" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact. However, the term "coupled" or "communicatively coupled (communicatively coupled)" may also mean that two or more elements are not in direct contact with each other, but yet still co-operate or interact with each other. The embodiments disclosed herein are not necessarily limited to the disclosure herein.

Exemplary embodiments are described herein with reference to cross-sectional and/or plan views as idealized exemplary figures. In the drawings, the thickness of layers and regions are exaggerated for clarity. Thus, variations from the shape of the drawings due to, for example, manufacturing techniques and/or tolerances, are to be expected. Thus, the exemplary embodiments should not be construed as limited to the shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of example embodiments.

Referring to fig. 1, some embodiments of the present disclosure provide a flexible display panel 100. The flexible display panel 100 has a display area Q1 and a non-display area Q2. The non-display area Q2 includes a roll extending area Q21, where the roll extending area Q21 is located at one side of the display area Q1 and connected to the first side edge a1 of the display area Q1. Wherein, the display area Q ₁ The plurality of sub-pixel regions P may include, for example, a plurality of red sub-pixel regions, a plurality of green sub-pixel regions, and a plurality of blue sub-pixel regions.

In some examples, the non-display region Q2 further includes: and a frame region Q22. Fig. 1 illustrates an example in which the frame region Q22 is disposed on three sides of the display region Q1. It will be appreciated that in other examples, the bezel area Q22 may be disposed on one side, both sides, or around the display area Q1, etc. of the display area Q1.

The frame region Q22 may be used to provide a dummy pixel region, a gate driving circuit, a peripheral signal line, a barrier dam, and the like.

Referring to fig. 1 and 2, the flexible display panel 100 includes: a substrate 10 and a multi-layer insulating layer 20.

The substrate 10 covers the display region Q1 and the non-display region Q2. A multi-layer insulating layer 20 is positioned on the substrate 10; at least one insulating layer 20 of the plurality of insulating layers 20 extends from the display region Q1 to the roll extension region Q21.

The material of the substrate 10 includes a flexible material, and the flexible material may be at least one of Polyimide (PI) and polyethylene terephthalate (polyethylene terephthalate, PET) for example. The substrate 10 may be formed as a single layer, a double layer, or multiple layers.

The part of the at least one insulating layer 20 located in the sliding roll extending area Q21 is a step structure 30, that is, the part of the at least one insulating layer 20 located in the sliding roll extending area Q21 is a step structure 30 in all insulating layers 20 extending to the sliding roll extending area Q21. The height of the stepped structure 30 gradually decreases in the first direction a-a'. The first direction a-a' is from the end of the sliding roll extending area Q21 close to the display area Q1 to the end of the sliding roll extending area Q21 far away from the display area Q1.

In the flexible display panel 100 provided in some embodiments of the present disclosure, since at least one insulating layer 20 of the multi-layer insulating layers 20 extends from the display area Q1 to the roll extending area Q21, and the portion of the at least one insulating layer 20 located in the roll extending area Q21 is the step structure 30, the height of the step structure 30 is gradually reduced along the direction away from the display area Q1, so as to reduce the difference between the display area Q1 and the non-display area Q2, thereby improving the problem that when the flexible display panel 100 is bent, peeling and bubbles are easily generated between the film layers due to the large step difference between the display area Q1 and the roll extending area Q21.

In some embodiments, referring to fig. 3, the flexible display panel 100 includes: a circuit structure layer 110, a light emitting structure layer 120, and an encapsulation layer 130.

The circuit structure layer 110 is located on one side of the substrate 10.

Illustratively, the circuit structure layer 110 includes: a plurality of pixel driving circuits, a gate driving circuit, at least one signal line, and the like.

The pixel drive circuit may include a plurality of transistors and at least one (e.g., one; e.g., a plurality of) capacitors. For example, the pixel driving circuit may have a structure of "2T1C", "6T1C", "7T1C", "6T2C", or "7T2C", or the like. Here, "T" means a transistor, for example, a thin film transistor. The number preceding the "T" is denoted as the number of transistors. "C" is denoted as a capacitor, and the number preceding "C" is denoted as the number of capacitors. Only one thin film transistor T is illustrated in the drawings of some embodiments of the present disclosure.

The pixel driving circuits are respectively located in the sub-pixel areas P, and each pixel driving circuit at least comprises a driving transistor T. In some examples, the driving transistor T includes a source, a drain, an active layer, and a gate. In other examples, the driving transistor T includes a source electrode, a drain electrode, an active layer, a first gate electrode, and a second gate electrode.

The gate driving circuit (Gate Driver On Array, array substrate row driving circuit) can be located in the frame region Q ₂₂ For supplying the gate scan signal to the pixel driving circuit. The Gate driving circuit may include, for example, an EM GOA and at least one group Gate GOA. The EM GOA outputs an EM (emission control) signal, and the Gate GOA outputs a Gate scan signal.

It should be noted that the circuit structure layer 110 further includes a plurality of insulating layers and at least one planarization layer.

Illustratively, as shown in fig. 3, the circuit structure layer 110 further includes a first gate insulating layer 111, a second gate insulating layer 112, an interlayer dielectric layer 113, a passivation layer 114, and at least one planarization layer 115.

The first gate insulating layer 111 is located between the first gate electrode of the driving transistor T and the active layer of the driving transistor T; the second gate insulating layer 112 covers the second gate electrode of the driving transistor T; the interlayer dielectric layer 113 is located between the first gate of the driving transistor T and the second gate of the driving transistor T; the passivation layer 114 is located at a side of the source and drain electrodes of the driving transistor T away from the substrate 10.

When the circuit structure layer 110 further includes connection electrodes connected to the source and drain electrodes of the driving transistor T, at least one of the planarization layers 115 includes a first planarization layer 1151 and a second planarization layer 1152.

Wherein, the first planarization layer 1151 is disposed on a side of the source and drain electrodes of the driving transistor T away from the substrate 10; the second flat layer 1152 is provided on a side of the connection electrode remote from the substrate 10.

The light emitting structure layer 120 is located on a side of the circuit structure layer 110 away from the substrate 10, and the light emitting structure layer 120 at least covers the display area Q1. Illustratively, the light emitting structure layer 120 includes an anode layer 121, a light emitting function layer 122, and a cathode layer 123, which are sequentially stacked in a direction away from the substrate 10.

The light emitting functional layer 122 includes at least a light emitting layer. In some examples, the light emitting functional layer 122 includes at least one of an electron transport layer, an electron injection layer, a hole transport layer, and a hole injection layer in addition to the light emitting layer.

Illustratively, the light emitting structure layer 120 may be divided into a plurality of light emitting devices, each including an anode, a light emitting part, and a cathode, which are stacked. Wherein, the anode layer 121 is composed of a plurality of anodes, the light-emitting functional layer 122 is composed of a plurality of light-emitting parts, and the cathode layer 123 is composed of a plurality of cathodes.

It is worth noting that: the light emitting functional layer 122 may have a plurality of block structures, or may have a whole layer structure connected together; likewise, the cathode layer 123 may have a plurality of block structures, or may have a monolithic structure connected together.

One light emitting device in the light emitting structure layer 120 is located in one sub-pixel region P, and one light emitting device is coupled to one pixel circuit configured to drive the light emitting device coupled thereto to emit light, thereby realizing picture display. For example, an anode of the light emitting device may be coupled to a source or drain of the driving transistor T in the pixel circuit, and a cathode of the light emitting device may be coupled to the VSS signal line, so that a driving current may flow through the light emitting device to drive the light emitting device to emit light.

Illustratively, as shown in FIG. 3, the light emitting functional layer 122 further includes a pixel defining layer 124. The pixel defining layer 124 is located on a side of the at least one planarization layer 115 remote from the substrate 10. The pixel defining layer 124 has an opening thereon for accommodating the plurality of light emitting devices described above.

The encapsulation layer 130 is located on a side of the light emitting structure layer 120 away from the circuit structure layer 110.

The encapsulation layer 130 may be an encapsulation film (Thin Film Encapsulation, abbreviated as TFE) or an encapsulation substrate. The encapsulation layer 130 is configured to encapsulate the pixel driving circuit and the plurality of light emitting devices on the substrate 10 to block water and oxygen, and to prevent the water and oxygen from corroding the light emitting devices, thereby affecting the light emitting efficiency and the service life of the light emitting devices.

In some examples, encapsulation layer 130 may include: the first inorganic layer, the organic layer and the second inorganic layer are sequentially arranged from bottom to top, and of course, the encapsulation layer 130 may further include more inorganic layers and organic layers. The first inorganic layer and/or the second inorganic layer may be formed by, for example, using an inorganic insulating material and using a deposition process; the organic layer may be formed, for example, using an organic insulating material and prepared using an inkjet printing process. Wherein the organic layer is located within the range defined by the barrier dam in the frame region Q22; the blocking dam can block the organic layer to ensure good packaging effect; the first inorganic layer and/or the second inorganic layer extends from the display area Q1 to the roll extension area Q21.

In some examples, referring to fig. 2, the insulating layer 20 extending to the roll extension Q21 includes a first insulating layer 21, a second insulating layer 22, and a third insulating layer 23. The first insulating layer 21, the second insulating layer 22, and the third insulating layer 23 are all located in the circuit structure layer 110.

Wherein the first insulating layer 21, the second insulating layer 22, and the third insulating layer 23 are sequentially distant from the substrate 10. The boundaries of the first insulating layer 21, the second insulating layer 22 and the third insulating layer 23 located in the sliding-coil extending area Q21 are sequentially close to the display area Q1.

In the present embodiment, the first insulating layer 21, the second insulating layer 22, and the third insulating layer 23 are sequentially away from the substrate 10. The boundaries of the first insulating layer 21, the second insulating layer 22 and the third insulating layer 23, which are located in the sliding roll extending area Q21, are sequentially close to the display area Q1, the positions of the first insulating layer 21, the second insulating layer 22 and the third insulating layer 23, which are located in the sliding roll extending area Q21, form the step-shaped structure 30, the height of the step-shaped structure 30 is gradually reduced along the direction a-a' away from the display area Q1, and the step-shaped structure 30 can reduce the step difference between the display area Q1 and the non-display area Q2, so that the problems that when the flexible display panel 100 is bent, the film layers are easy to peel and generate bubbles due to the large step difference between the display area Q1 and the sliding roll extending area Q21 are solved.

The size of the distance d1 between the boundary of the first insulating layer 21 and the boundary of the second insulating layer 22 and the second insulating layer 22, and the distance d2 between the boundary of the second insulating layer 22 and the boundary of the third insulating layer 23 and the first insulating layer Q21 may depend on the size of the dimension of the first insulating layer 21 in the direction perpendicular to the boundary of the display region Q1. It will be appreciated by those skilled in the art that the gradient of the stepped structure 30 formed at the portion of the at least one insulating layer 20 located in the roll extension region Q21 is as gentle as possible, in addition to the size of the roll extension region Q21 in the direction perpendicular to the boundary of the display region Q1.

In some embodiments, with continued reference to fig. 2, a distance d1 between a boundary of the first insulating layer 21 located at the roll extension Q21 and a boundary of the second insulating layer 22 located at the roll extension Q21 is equal to a distance d2 between a boundary of the second insulating layer 22 located at the roll extension Q21 and a boundary of the third insulating layer 23 located at the roll extension Q21.

In some examples, referring to fig. 2, a distance d0 between a boundary of the third insulating layer 23 located at the extended region Q21 of the slider and a side of the display region Q1 near the extended region Q21 of the slider is equal to a distance d1 between a boundary of the first insulating layer 21 located at the extended region Q21 of the slider and a boundary of the second insulating layer 22 located at the extended region Q21 of the slider, and a distance d2 between a boundary of the second insulating layer 22 located at the extended region Q21 of the slider is equal to a distance d2 between a boundary of the third insulating layer 23 located at the extended region Q21 of the slider.

At this time, the first insulating layer 21, the second insulating layer 22 and the third insulating layer 23 are located in the roll extending area Q21 to form the above-mentioned stepped structure 30, and the height of the stepped structure 30 is uniformly and gradually reduced along the direction a-a' away from the display area Q1, so that the difference between the display area Q1 and the non-display area Q2 can be reduced, thereby improving the problems that the film layers are easily peeled off and bubbles are generated due to the large step difference between the display area Q1 and the roll extending area Q21 when the flexible display panel 100 is bent.

In some embodiments, referring to fig. 2 and 4, the insulating layer 20 extending to the roll extension region Q21 further includes a fourth insulating layer 24, the fourth insulating layer 24 is located in the circuit structure layer 110, and the fourth insulating layer 24 is located on a side of the third insulating layer 23 away from the substrate 10.

In some examples, referring to fig. 2, the boundary of the fourth insulating layer 24 located at the roll extension region Q21 is further away from the display region Q1 than the boundary of the first insulating layer 21 located at the roll extension region Q21. Illustratively, the boundary of the fourth insulating layer 24 at the roll extension Q21 is flush with the boundary of the substrate 10 at the roll extension Q21, i.e., as shown in fig. 2. The fourth insulating layer 24 extends from the display area Q1 to the roll extending area Q21, and the break difference between the display area Q1 and the non-display area Q2 of the flexible display panel 100 is smaller, so that the problems that peeling and bubbles are easily generated between film layers due to the large step difference between the display area Q1 and the roll extending area Q21 when the flexible display panel 100 is bent are more advantageously improved.

In some examples, referring to fig. 4, the boundary of the fourth insulating layer 24 located at the roll extension region Q21 is closer to the display region Q1 than the boundary of the third insulating layer 23 located at the roll extension region Q21. The parts of the first insulating layer 21, the second insulating layer 22, the third insulating layer 23 and the fourth insulating layer 24, which are positioned in the sliding roll extending area Q21, form the step-shaped structure 30, and the height of the step-shaped structure 30 is gradually reduced along the direction a-a' away from the display area Q1, so that the difference between the display area Q1 and the non-display area Q2 can be reduced, and the problems that when the flexible display panel 100 is bent, peeling and bubble generation are easy to occur between film layers due to the large step difference between the display area Q1 and the sliding roll extending area Q21 are solved.

When the boundary of the fourth insulating layer 24 located in the roll extension region Q21 is closer to the display region Q1 than the boundary of the third insulating layer 23 located in the roll extension region Q21, the distance d3 between the boundary of the fourth insulating layer 24 located in the roll extension region Q21 and the boundary of the third insulating layer 23 located in the roll extension region Q21, the distance d1 between the boundary of the first insulating layer 21 located in the roll extension region Q21 and the boundary of the second insulating layer 22 located in the roll extension region Q21, and the distance d2 between the boundary of the second insulating layer 22 located in the roll extension region Q21 and the boundary of the third insulating layer 23 located in the roll extension region Q21 may be equal.

In some examples, referring to fig. 4, a distance d4 between a boundary of the fourth insulating layer 23 located at the roll extension region Q21 and a side of the display region Q1 near the roll extension region Q21 is equal to a distance d3 between a boundary of the third insulating layer 23 located at the roll extension region Q21, a distance d1 between a boundary of the first insulating layer 21 located at the roll extension region Q21 and a boundary of the second insulating layer 22 located at the roll extension region Q21, and a distance d2 between a boundary of the second insulating layer 22 located at the roll extension region Q21 and a boundary of the third insulating layer 23 located at the roll extension region Q21.

In this embodiment, the step-like structure 30 formed by the portions of the second insulating layer 22, the third insulating layer 23 and the fourth insulating layer 24 located in the roll extending region Q21 has a uniform and gradually reduced height along the direction a-a' away from the display region Q1, which is more beneficial to reducing the difference between the display region Q1 and the non-display region Q2, so as to improve the problem that when the flexible display panel 100 is bent, peeling and bubbles are easily generated between the film layers due to the larger difference between the display region Q1 and the roll extending region Q21.

In some embodiments, referring to fig. 2 to 4, the first insulating layer 21 is the first gate insulating layer 111; the second insulating layer 22 is a second gate insulating layer 112; the third insulating layer 23 is an interlayer dielectric layer 113; the fourth insulating layer 24 is a passivation layer 114. Thus, on the basis of relatively simple manufacturing process, the difference between the display area Q1 and the non-display area Q2 can be reduced, so that the problems of easy peeling and bubble generation between film layers caused by the large step difference between the display area Q1 and the roll extending area Q21 when the flexible display panel 100 is bent are solved.

In some embodiments, referring to fig. 2 and 4, at least one planarization layer 115 is located on a side of the fourth insulating layer 24 away from the substrate 10, and at least one planarization layer 115 extends from the display area Q1 to the scroll extension area Q21. The boundary of the at least one flat layer 115 located at the roll extension region Q21 is further away from the display region Q1 than the boundary of the first insulating layer 21 located at the roll extension region Q21.

In some examples, the boundary of at least one planar layer 115 at the roll extension Q21 is flush with the boundary of the substrate 10 at the roll extension Q21, i.e., as shown in fig. 2 and 4.

In some examples, the boundary of at least one flat layer 115 at the roll extension region Q21 is closer to the display region Q1 than the boundary of the substrate 10 at the roll extension region Q21.

In this embodiment, at least one flat layer 115 extends from the display area Q1 to the roll extending area Q21, so as to reduce the break between the display area Q1 and the non-display area Q2 of the flexible display panel 100, thereby being more beneficial to improving the problems of easy peeling and bubble generation between the film layers caused by the large step between the display area Q1 and the roll extending area Q21 when the flexible display panel 100 is bent.

In some embodiments, referring to fig. 4, the spool extension Q21 includes: an edge region Q22 distant from the display region Q1. In the edge region Q22, at least one planarization layer 115 is in contact with the substrate 10.

The at least one planarization layer 115 may be formed by various methods, and may be formed using an organic material including PI (Polyimide), benzocyclobutene (BCB), or acrylic, or an inorganic material including silicon nitride (SiNx). Illustratively, the material of the at least one planarizing layer 115 may be selected from polyimide. Because the flexibility of the organic material is better than that of the inorganic material, the flexibility of the portion of the flexible display panel 100 located in the roll extension region Q21 is effectively improved, and the service life of the flexible display panel 100 is prolonged.

In this embodiment, when the flexible display panel 100 is used for a roll display device, the edge area Q22 away from the display area Q1 may be used for fixing the roll mechanical structure; in the edge region Q22, at least one flat layer 115 contacts the substrate 10, which not only improves flexibility of the roll extending region Q21 of the flexible display panel 100, but also reduces a break difference between the display region Q1 and the non-display region Q2 of the flexible display panel 100, thereby being more beneficial to improving problems of easy peeling and bubble generation between film layers caused by a large step difference between the display region Q1 and the roll extending region Q21 when the flexible display panel 100 is bent.

In some embodiments, referring to fig. 4, the pixel defining layer 124 is located on a side of the at least one planarization layer 115 away from the substrate 10. The pixel defining layer 124 extends from the display region Q1 to the roll extending region Q21; the boundary of the pixel defining layer 124 located at the roll extension region Q21 is further away from the display region Q1 than the boundary of the first insulating layer 21 located at the roll extension region Q21. Within the edge region Q22, the pixel defining layer 124 is in contact with at least one planarization layer 115.

In some examples, the boundary of the pixel defining layer 124 at the roll extension Q21 is flush with the boundary of the at least one flat layer 115 at the roll extension Q21, i.e., as shown in fig. 2 and 4.

In some examples, the boundary of the pixel defining layer 124 at the roll extension Q21 is closer to the display region Q1 than the boundary of the at least one planarization layer 115 at the roll extension Q21.

In the present embodiment, the pixel defining layer 124 extends from the display area Q1 to the roll extending area Q21 to contact with the at least one flat layer 115, so that the difference between the display area Q1 and the non-display area Q2 of the flexible display panel 100 is smaller, which is more beneficial to improving the problems of easy peeling and bubble generation between the film layers caused by the larger step difference between the display area Q1 and the roll extending area Q21 when the flexible display panel 100 is bent.

In some embodiments, referring to fig. 5, the flexible display panel 100 further includes at least one barrier 40 on the substrate 10. At least one blocking block 40 is located at an edge region Q22 away from the display region Q1 and is disposed around the stepped structure 30, respectively.

The at least one blocking block 40 may be formed using an organic material including PI (Polyimide), benzocyclobutene (BCB), or acrylic, or an inorganic material including silicon nitride (SiNx). Illustratively, the material of the at least one blocking piece 40 may be selected from polyimide.

In this embodiment, at least one blocking block 40 is inserted into the continuous integral structure formed by the first inorganic layer and/or the second inorganic layer in the edge region Q22, so that the connection tightness and the structural stability of the flexible display panel 100 are effectively improved, and the problems of easy peeling and bubble generation between the film layers caused by the large step difference between the display region Q1 and the roll extending region Q21 when the flexible display panel 100 is bent are further improved.

In some embodiments, referring to fig. 5 and 6, the barrier 40 includes at least one barrier layer 401, at least a portion of the barrier layer 401 of all of the barrier layers 401 being co-located with the at least one planar layer 115.

It is understood that where at least one of the planar layers 115 is a single layer, the barrier 40 may comprise one or more barrier layers 401, wherein at least one barrier layer 401 is co-located with at least one planar layer 115, as shown in fig. 5.

Where at least one of the planarization layers 115 includes a first planarization layer 1151 and a second planarization layer 1152, the barrier 40 may include one barrier layer 401 or multiple barrier layers 401. When the barrier 40 includes a barrier layer 401, the barrier layer 401 may be disposed in the same layer as the first flat layer 1151, or the barrier layer 401 may be disposed in the same layer as the second flat layer 1152. Where barrier 40 comprises a multi-layer barrier, a layer of barrier 401 adjacent to one side of substrate 10 may be co-layer with first planar layer 1151; one of the barrier layers 401 on the side remote from the base 10 may be co-layer with the second planar layer 1152.

It is to be readily understood that reference to "the same layer" in the embodiments of the present disclosure refers to a layer structure in which a film layer for forming a specific pattern is formed using the same film forming process and then formed through one patterning process using the same mask plate. Depending on the particular pattern, a patterning process may include multiple exposure, development, or etching processes, and the particular patterns in the formed layer structure may be continuous or discontinuous, and may be at different heights or have different thicknesses.

In this embodiment, at least a portion of the barrier layers 401 in all the barrier layers 401 and at least one of the flat layers 115 are arranged in the same layer, i.e. formed by a one-time patterning process, which is beneficial to simplifying the manufacturing process of the flexible display panel 100 and saving the manufacturing cost.

In some embodiments, with continued reference to FIG. 6, the pixel defining layer 124 is located on a side of the at least one planarization layer 115 away from the substrate 10. The pixel defining layer 124 extends from the display region Q1 to the roll extending region Q21; the boundary of the pixel defining layer 124 located at the roll extension region Q21 is further away from the display region Q1 than the boundary of the first insulating layer 21 located at the roll extension region Q21. One barrier layer 401 of the at least one barrier layer 401 furthest from the substrate 10 is disposed in common with the pixel defining layer 124. The barrier layer 401 and the pixel defining layer 124 of the at least one barrier layer 401, which are furthest from the substrate 10, are formed by a one-time patterning process, which is beneficial to simplifying the manufacturing process of the flexible display panel 100 and saving the manufacturing cost.

In some embodiments, referring to fig. 7, the substrate 10 includes: buffer layer 11, first barrier layer 12, first substrate 13, second barrier layer 14, and second substrate 15.

Wherein the buffer layer 11 is located at a side of the first insulating layer 21 remote from the second insulating layer 22. The first barrier layer 12 is located on the side of the buffer layer 11 remote from the first insulating layer 21. The first substrate 13 is located on a side of the first barrier layer 12 remote from the buffer layer 11. The second barrier layer 14 is located on the side of the first substrate 13 remote from the first barrier layer 12. The second substrate 15 is located on the side of the second barrier layer 14 remote from the first substrate 13.

The material of the buffer layer 11 may be one of silicon oxide (SiO 2) and silicon nitride (SiNx).

The first substrate 13 and the second substrate 15 may be made of PET (Polyethylene terephthalate ), PEN (Polyethylene naphthalate two formic acid glycol ester, polyethylene naphthalate), PI (Polyimide), or the like.

The material of the first and second barrier layers 12 and 14 may be one of silicon oxide (SiO 2) and silicon nitride (SiNx).

A groove 16 is formed on one side of the substrate 10 close to the first insulating layer 21, and the groove 16 is located in an edge area Q22; the recess 16 penetrates at least one of the buffer layer 11, the first barrier layer 12, the first substrate 13, and the second barrier layer 14.

It should be noted that "the groove 16 penetrates at least one of the buffer layer 11, the first barrier layer 12, the first substrate 13, and the second barrier layer 14" includes that the groove 16 penetrates the buffer layer 11; and, a groove 16 penetrates the buffer layer 11 and the first barrier layer 12; and, the recess 16 penetrates the buffer layer 11, the first barrier layer 12 and the first substrate 13; and, the groove 16 penetrates the buffer layer 11, the first barrier layer 12, the first substrate 13, and the second barrier layer 14, which are four cases.

With continued reference to fig. 7, the blocking piece 40 is located in the recess 16, and the encapsulation layer 130 covers the blocking piece 40 and the recess 16.

In this embodiment, the substrate 10 is provided with the recess 16 on the side close to the first insulating layer 21, the blocking piece 40 is located in the recess 16, and the encapsulation layer 130 covers the blocking piece 40 and the recess 16, so that the contact between the encapsulation layer 130 and the substrate 10 can be reinforced, and when the substrate 10 is in a multi-layer structure, the first blocking layer 12, the first substrate 13, the second blocking layer 14 or the second substrate 15 in the substrate 10 far from the first insulating layer 21 is easy to peel and generate bubbles when the flexible display panel 100 is bent.

In some embodiments, referring to fig. 8, the circuit structure layer 110 further includes a dummy pixel circuit located in the roll extension Q21. The dummy pixel circuit may include a plurality of transistors and at least one (e.g., one; e.g., a plurality of) capacitors. For example, the dummy pixel circuit may have a structure of "2T1C", "6T1C", "7T1C", "6T2C", or "7T2C", or the like. Here, "T" means a transistor, for example, a thin film transistor. The number preceding the "T" is denoted as the number of transistors. "C" is denoted as a capacitor, and the number preceding "C" is denoted as the number of capacitors. Only one thin film transistor T' is illustrated in the drawings of some embodiments of the present disclosure.

It should be noted that, the virtual pixel circuit located in the slide roll extension area Q21 may be manufactured together with the plurality of pixel driving circuits located in the display area Q1, so that the process is simple, and no additional manufacturing process is required; on the other hand, the pixel driving circuit is disposed in the display region Q1, and the dummy pixel circuit fabricated together with the plurality of pixel driving circuits in the display region Q1 is disposed in the roll extending region Q21 located at one side of the display region Q1, so that the difference between the display region Q1 and the roll extending region Q21 can be relatively reduced, and the problem that peeling and bubble generation easily occur between the film layers due to the large difference between the display region Q1 and the roll extending region Q21 when the flexible display panel 100 is bent can be improved.

In some embodiments, the circuit structure layer 110 further includes a dummy gate driving circuit located in the roll extension region Q21. The virtual gate driving circuit located in the slide roll extending area Q21 and the gate driving circuit located in the frame area Q22 can be manufactured together, so that the process is simple, and no additional manufacturing process is needed; on the other hand, by providing the dummy gate driving circuit in the roll extension region Q21 located at one side of the display region Q1, the difference between the display region Q1 and the roll extension region Q21 can be relatively reduced, and the problem that peeling and generation of bubbles easily occur between film layers due to a large difference in level between the display region Q1 and the roll extension region Q21 when the flexible display panel 100 is bent can be improved.

The above-described dummy pixel circuit is different from the pixel circuit of the display region in that the dummy pixel circuit is provided with only the same structure as the pixel circuit, but the dummy pixel circuit does not have an electrical signal (for example, at least one signal line of the input end of the dummy pixel circuit may be cut off), that is, the dummy pixel circuit does not operate in the process of realizing display of the flexible display panel 100.

The above-described dummy gate driving circuit is different from the gate driving circuit of the frame region in that the dummy gate driving circuit is provided only with the same structure as the gate driving circuit, but the dummy gate driving circuit is not connected to an electric signal (for example, at least one signal line of an input end of the dummy gate driving circuit may be cut off), that is, the dummy gate driving circuit does not operate in a process of realizing display of the flexible display panel 100.

Embodiments of the present disclosure also provide a slider display device 1000, as shown in fig. 9. The roll display device 1000 includes the flexible display panel 100 provided in the above-described embodiment.

In some examples, the reel display device 1000 may be any device that displays images whether in motion (e.g., video) or stationary (e.g., still image) and whether textual or pictorial. More particularly, it is contemplated that the embodiments may be implemented in or associated with a variety of electronic devices such as, but not limited to, mobile telephones, wireless devices, personal Data Assistants (PDAs), hand-held or portable computers, GPS receivers/navigators, cameras, MP4 video players, video cameras, game consoles, wrist watches, clocks, calculators, television monitors, flat panel displays, computer monitors, auto displays (e.g., odometer display, etc.), navigators, cabin controllers and/or displays, displays of camera views (e.g., display of a rear view camera in a vehicle), electronic photographs, electronic billboards or signs, projectors, architectural structures, packaging, and aesthetic structures (e.g., display of images on a piece of jewelry), and the like.

In some examples, referring to fig. 9, the roll display device 1000 further includes a roll shaft 200, and the flexible display panel 100 is in contact with a portion of an outer circumferential surface b1 of the roll shaft 200. Wherein the outer circumferential surface refers to an outer surface of the spool 200 in the circumferential direction.

For example, the above-described roll display device 1000 may further include a frame, a source driving chip, an FPC (Flexible Printed Circuit, flexible wiring board), a PCB (Printed Circuit Board, printed wiring board), or other electronic parts, etc.

The roll display device 1000 provided by the present disclosure includes the flexible display panel 100 provided by the above-mentioned technical solution, and by reducing the level difference between the display area Q1 and the non-display area Q2, the problem that peeling and bubbles are easily generated between film layers due to the large level difference between the display area Q1 and the roll extension area Q21 when the non-display area Q2 is in contact with the part of the outer peripheral surface b1 of the roll 200 is improved.

The foregoing is merely a specific embodiment of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art who is skilled in the art will recognize that changes or substitutions are within the technical scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A flexible display panel, comprising a display area and a non-display area, wherein the non-display area comprises a slide roll extension area positioned at one side of the display area; the flexible display panel includes:

a substrate covering the display region and the non-display region;

a multi-layer insulating layer on the substrate; at least one of the plurality of insulating layers extends from the display area to the roll extension area;

wherein, the part of the at least one insulating layer, which is positioned in the sliding roll extension area, is of a ladder-shaped structure; the height of the step-shaped structure gradually decreases along a first direction, and the first direction points to one end of the sliding roll extending area far away from the display area from one end of the sliding roll extending area near the display area;

the flexible display panel includes:

a circuit structure layer positioned on one side of the substrate;

a light emitting structure layer positioned on one side of the circuit structure layer away from the substrate;

the packaging layer is positioned at one side of the light-emitting structure layer far away from the circuit structure layer;

the insulation layer extending to the slide roll extension region comprises a first insulation layer, a second insulation layer and a third insulation layer which are positioned in the circuit structure layer; the first insulating layer, the second insulating layer and the third insulating layer are sequentially far away from the substrate, and the boundaries of the first insulating layer, the second insulating layer and the third insulating layer, which are positioned in the sliding roll extending area, are sequentially close to the display area.

2. A flexible display panel according to claim 1, wherein,

the distance between the boundary of the first insulating layer, which is positioned in the sliding roll extension area, and the boundary of the second insulating layer, which is positioned in the sliding roll extension area, is equal to the distance between the boundary of the second insulating layer, which is positioned in the sliding roll extension area, and the boundary of the third insulating layer, which is positioned in the sliding roll extension area.

3. The flexible display panel of claim 1 or 2, wherein the insulating layer extending to the roll extension region further comprises:

a fourth insulating layer in the circuit structure layer, the fourth insulating layer being located on a side of the third insulating layer remote from the substrate;

wherein the border of the fourth insulating layer located at the roll extension area is closer to the display area than the border of the third insulating layer located at the roll extension area; or, the border of the fourth insulating layer located in the sliding roll extension area is further away from the display area than the border of the first insulating layer located in the sliding roll extension area.

4. A flexible display panel according to claim 3, wherein,

the first insulating layer is a first gate insulating layer; the second insulating layer is a second gate insulating layer; the third insulating layer is an interlayer dielectric layer; the fourth insulating layer is a passivation layer.

5. A flexible display panel according to claim 3, wherein the circuit structure layer further comprises:

at least one flat layer positioned on one side of the fourth insulating layer away from the substrate; the at least one flat layer extends from the display area to the roll extension area, and a boundary of the at least one flat layer located at the roll extension area is further away from the display area than a boundary of the first insulating layer located at the roll extension area.

6. The flexible display panel of claim 5, wherein the roll extension comprises: an edge region remote from the display region;

in the edge region, the at least one planar layer is in contact with the substrate.

7. The flexible display panel of claim 6, wherein the light emitting structure layer comprises:

a pixel defining layer located on a side of the at least one planarization layer away from the substrate; the pixel defining layer extends from the display region to the roll extension region, and a boundary of the pixel defining layer at the roll extension region is farther from the display region than a boundary of the first insulating layer at the roll extension region;

Within the edge region, the pixel defining layer is in contact with the at least one planarization layer.

8. The flexible display panel of claim 5, wherein the roll extension comprises: an edge region remote from the display region;

the flexible display panel further includes:

at least one blocking block located on the substrate, the at least one blocking block being located in the edge region and being disposed around the stepped structure, respectively.

9. The flexible display panel of claim 8, wherein the flexible display panel comprises,

the barrier comprises at least one barrier layer, at least part of all the barrier layers being arranged in the same layer as the at least one planar layer.

10. The flexible display panel of claim 9, wherein the light emitting structure layer comprises:

a pixel defining layer located on a side of the at least one planarization layer away from the substrate; the pixel defining layer extends from the display region to the roll extension region, and a boundary of the pixel defining layer at the roll extension region is farther from the display region than a boundary of the first insulating layer at the roll extension region; one of the at least one barrier layer furthest from the substrate is disposed co-layer with the pixel defining layer.

11. The flexible display panel according to any one of claims 8 to 10, wherein the substrate comprises:

a buffer layer positioned on one side of the first insulating layer away from the second insulating layer;

a first barrier layer positioned on one side of the buffer layer away from the first insulating layer;

a first substrate positioned on one side of the first barrier layer away from the buffer layer;

a second barrier layer located on a side of the first substrate remote from the first barrier layer; the method comprises the steps of,

a second substrate positioned on one side of the second barrier layer away from the first substrate;

a groove is formed in one side, close to the first insulating layer, of the substrate, and the groove is located in the edge area; the recess extends through at least one of the buffer layer, the first barrier layer, the first substrate, and the second barrier layer;

the blocking block is positioned in the groove;

the encapsulation layer covers the blocking block and the groove.

12. A flexible display panel according to claim 1 or 2, wherein the circuit structure layer comprises:

a dummy pixel circuit located in the roll extension region; and/or the number of the groups of groups,

and the virtual grid driving circuit is positioned in the slide coil extension area.

13. A flexible display panel, comprising a display area and a non-display area, wherein the non-display area comprises a slide roll extension area positioned at one side of the display area; the flexible display panel includes:

a substrate covering the display region and the non-display region;

a circuit structure layer positioned on one side of the substrate;

wherein the circuit structure layer comprises a virtual pixel circuit positioned in the slide roll extension area; and/or the circuit structure layer comprises a virtual grid driving circuit positioned in the slide roll extension area;

the flexible display panel includes:

a circuit structure layer positioned on one side of the substrate;

14. A slide-roller display device, comprising:

a spool;

the flexible display panel according to any one of claims 1 to 13, which is in contact with a part of an outer peripheral surface of the spool.