CN210668428U - Foldable display substrate and foldable display device - Google Patents
Foldable display substrate and foldable display device Download PDFInfo
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- CN210668428U CN210668428U CN202020001604.9U CN202020001604U CN210668428U CN 210668428 U CN210668428 U CN 210668428U CN 202020001604 U CN202020001604 U CN 202020001604U CN 210668428 U CN210668428 U CN 210668428U
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Abstract
The utility model provides a collapsible display substrates and collapsible display device, this collapsible display substrates includes: the foldable display substrate comprises a flexible substrate, a plurality of light-emitting units arranged on the flexible substrate and a thin film packaging layer covering the light-emitting units, wherein the thin film packaging layer comprises an inorganic packaging layer, and the inorganic packaging layer is disconnected in a bending area of the foldable display substrate. The utility model discloses in, display substrate can realize buckling to both sides, and the range of just buckling is great, realizes the folding performance of preferred.
Description
Technical Field
The embodiment of the utility model provides a relate to and show technical field, especially relate to a collapsible display substrates and collapsible display device.
Background
An Organic Light-Emitting Diode (OLED) display device has advantages of bright color, self-luminescence, lightness, thinness, flexibility, and the like. The OLED display device can adopt a flexible substrate and can be packaged by a thin film packaging layer, so that the OLED display device has the characteristic of flexibility and can be folded.
However, current foldable display devices can typically only achieve one-sided bending, and can only achieve a smaller degree of bending.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a collapsible display substrates and collapsible display device for solve current OLED display device and can only realize the unilateral and buckle, and buckle the little problem of range.
In order to solve the technical problem, the utility model discloses a realize like this:
in a first aspect, an embodiment of the present invention provides a foldable display substrate, including: the foldable display substrate comprises a flexible substrate, a plurality of light-emitting units arranged on the flexible substrate and a thin film packaging layer covering the light-emitting units, wherein the thin film packaging layer comprises an inorganic packaging layer, and the inorganic packaging layer is disconnected in a bending area of the foldable display substrate.
Optionally, the thin film encapsulation layer further includes an organic encapsulation layer, and the organic encapsulation layer is broken at the bending region.
Optionally, a groove is formed at a position where the inorganic encapsulation layer and the organic encapsulation layer are disconnected, and a size of a notch of the groove is larger than a size of a groove bottom.
Optionally, the foldable display substrate further includes:
the flexible circuit board comprises a signal line, an insulating layer and a metal bridging line, wherein the signal line, the insulating layer and the metal bridging line are arranged on the flexible substrate, the signal line is in the state that the bending area is disconnected, the bending area is connected with the metal bridging line in an overlapping mode, and the insulating layer is arranged between the signal line and the metal bridging line.
Optionally, the insulating layer is an organic insulating layer.
Optionally, the signal line includes at least one of:
the first gate metal layer signal wire is in lap joint in the bending area through a second gate metal layer bridging wire;
the second gate metal layer signal line is in lap joint in the bending area through a first source-drain metal layer bridging line;
and the first source-drain metal layer signal line is overlapped in the bending region through a bridging line of a second source-drain metal layer.
Optionally, the foldable display substrate further includes:
at least one inorganic insulating layer arranged on the flexible substrate, wherein at least part of the inorganic insulating layer in the at least one inorganic insulating layer is disconnected in the bending area;
the inorganic insulating layer includes at least one of: a gate insulating layer and an interlayer dielectric layer.
Optionally, an orthographic projection of the light emitting unit on the flexible substrate does not overlap with an orthographic projection of the bending region on the flexible substrate.
Optionally, the foldable display substrate specifically includes:
the flexible substrate;
a first gate insulating layer disconnected at the bending region;
a first gate metal layer signal line that is disconnected at the bend region;
a second gate insulating layer;
the second gate metal layer comprises a second gate metal layer signal line and a second gate metal layer bridging line, the second gate metal layer signal line is disconnected in the bending area, and the second gate metal layer bridging line is in lap joint with the first gate metal layer signal line through a through hole in the second gate insulating layer;
the interlayer dielectric layer is disconnected in the bending area;
the first organic layer is arranged in the bending area and covers the second gate metal layer bridging line;
the first source-drain metal layer comprises a first source-drain metal layer signal line and a first source-drain metal layer bridging line, the first source-drain metal layer signal line is disconnected in the bending area, and the first source-drain metal layer bridging line is in lap joint with the second gate metal layer signal line through a through hole in the interlayer dielectric layer;
the second organic layer is arranged in the bending area and covers the bridging line of the first source drain metal layer;
a second source-drain metal layer bridging line, wherein the second source-drain metal layer bridging line is in lap joint with the first source-drain metal layer signal line through a via hole on the second organic layer;
a third organic layer.
In a second aspect, an embodiment of the present invention provides a foldable display device, including the above foldable display substrate.
The embodiment of the utility model provides an in, because the inorganic encapsulation layer of film encapsulation layer breaks off at collapsible display substrate's the regional of buckling, therefore the region of buckling does not receive the influence of inorganic encapsulation layer stress to can realize adding by a wide margin the bending (buckle the less bending of reducing promptly), and also can realize two side bendings simultaneously, realize the folding performance of preferred. In addition, since the bending radius of the display substrate is small, the influence of the bending region on the display is small, and the display effect of the bending region can be improved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of a foldable display substrate according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a foldable display substrate according to a second embodiment of the present invention;
fig. 3 is a schematic view of the distribution of the supporting bodies and the spacers on both sides of the bending region according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The current foldable display device is usually packaged by a thin film packaging layer, the thin film packaging layer includes an inorganic packaging layer, the inorganic packaging layer is usually relatively large in stress and the stress is directed to one direction, so as to avoid the inorganic packaging layer from being broken due to the stress when the inorganic packaging layer is bent, the display device can be bent only to one side, and only a relatively small bending (i.e. a relatively large bending radius) can be realized.
To solve the above problem, please refer to fig. 1, an embodiment of the present invention provides a foldable display substrate, including: the display substrate comprises a flexible substrate 100, a plurality of light emitting units 300 arranged on the flexible substrate 100, and a thin film packaging layer 400 covering the light emitting units 300, wherein the thin film packaging layer 400 comprises inorganic packaging layers 401 and 403, and the inorganic packaging layers 401 and 403 are disconnected in a bending area 10 of the display substrate.
The embodiment of the utility model provides an in, because the inorganic encapsulation layer of film encapsulation layer breaks off at collapsible display substrate's the regional of buckling, therefore the region of buckling does not receive the influence of inorganic encapsulation layer stress to can realize adding by a wide margin the bending (buckle the less bending of reducing promptly), and also can realize two side bendings simultaneously, realize the folding performance of preferred. In addition, since the bending radius of the display substrate is small, the influence of the bending region on the display is small, and the display effect of the bending region can be improved.
The embodiment of the present invention provides a flexible substrate 100 which can be made of flexible materials such as PI (Polyimide Film).
The light emitting unit 300 in the embodiment of the present invention may include an anode, a light emitting layer, and a cathode.
The embodiment of the utility model provides an inorganic encapsulation layer can adopt chemical vapor deposition technology (CVD), then through technologies such as mask plate exposure, development and sculpture again for inorganic encapsulation layer is at the regional disconnection of buckling. Specifically, a dry etching process may be used for etching.
In the embodiment shown in fig. 1, the thin film encapsulation layer 400 includes an inorganic encapsulation layer 401, an organic encapsulation layer 402 and an inorganic encapsulation layer 403, and in other embodiments of the present invention, the structure of the thin film encapsulation layer 400 is not limited thereto. For example, not limited to three layers.
In the embodiment shown in fig. 1, the organic encapsulation layer 402 of the thin film encapsulation layer 400 is also broken at the bending region 10. Thereby facilitating bending of the bending region. Because the folding performance of the organic encapsulation layer is better, of course, in some other embodiments of the present invention, the organic encapsulation layer may not be broken.
In the embodiment shown in fig. 1, a groove is formed at a position where the inorganic encapsulation layer and the organic encapsulation layer are disconnected, and the size of the notch of the groove is larger than that of the groove bottom, so that a space is provided for bending, and bending is facilitated.
Optionally, the cross section of the groove is an inverted trapezoid.
In the embodiment shown in fig. 1, the display substrate further includes a driving circuit layer 200, and the driving circuit layer is connected to the light emitting unit and is used for driving the light emitting unit to emit light.
In some embodiments of the present invention, optionally, the foldable display substrate further comprises: the flexible circuit board comprises a signal line, an insulating layer and a metal bridging line, wherein the signal line, the insulating layer and the metal bridging line are arranged on the flexible substrate, the signal line is in the state that the bending area is disconnected, the bending area is connected with the metal bridging line in an overlapping mode, and the insulating layer is arranged between the signal line and the metal bridging line. The signal line may be, for example, a gate line or a data line. The signal line breaks at the regional disconnection of buckling to through the regional overlap joint of buckling of metal bridging line, can avoid the signal line fracture when buckling, the metal bridging line's bending performance is better simultaneously, improves display substrate's life-span.
The utility model discloses in, optional, the insulating layer that is located between signal line and the metal bridging line is organic insulating layer, and organic insulating layer's folding performance is handed over, can improve display substrate's folding performance.
In some embodiments of the present invention, the signal line includes at least one of:
the first gate metal layer signal wire is in lap joint in the bending area through a second gate metal layer bridging wire;
the second gate metal layer signal line is in lap joint in the bending area through a first source-drain metal layer bridging line;
and the first source-drain metal layer signal line is overlapped in the bending region through a bridging line of a second source-drain metal layer.
The utility model discloses collapsible display substrates still includes: at least one inorganic insulating layer arranged on the flexible substrate, wherein at least part of the inorganic insulating layer in the at least one inorganic insulating layer is disconnected in the bending area; the inorganic insulating layer includes at least one of: a gate insulating layer and an interlayer dielectric layer. That is, the inorganic insulating layer on the display substrate can be completely or partially broken in the bending region, thereby avoiding the inorganic insulating layer from being broken when being bent due to large stress, and prolonging the service life of the display substrate.
Optionally, the foldable display substrate of the embodiment of the present invention further includes: and the support body (Dam) is used for supporting the mask plate in the process of evaporating the light emitting layer of the light emitting unit, and the support body is disconnected in the bending area, so that the influence of the support body on bending is avoided.
Optionally, in the embodiment of the present invention, the light emitting unit is in orthographic projection on the flexible substrate and the bending region is in orthographic projection on the flexible substrate does not overlap, that is, the bending region is not provided with the light emitting unit, so that the influence on the light emitting unit due to bending is avoided.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a foldable display substrate according to another embodiment of the present invention, the display substrate includes:
a flexible substrate 100; the flexible substrate 100 may be made of a flexible material such as PI.
A first gate insulating layer (GI1)201, the first gate insulating layer 201 being disconnected at the bending region; the first gate insulating layer 201 is an inorganic insulating layer, and is disconnected in the bending region, which is beneficial to bending the display substrate;
a first gate metal layer signal line 201, the first gate metal layer signal line 201 being disconnected in the bending region, the disconnection in the bending region being advantageous for bending the display substrate;
a second gate insulating layer 203; the second gate insulating layer 203 is an inorganic insulating layer, in this embodiment, the second gate insulating layer 203 is not disconnected in the bending region, and of course, in some other embodiments, the second gate insulating layer 203 may also be disconnected in the bending region;
a second gate metal layer, where the second gate metal layer includes a second gate metal layer signal line 2042 and a second gate metal layer bridging line 2041, and the second gate metal layer signal line 2042 is disconnected in the bending region, which is beneficial to bending the display substrate; the second gate metal layer bridging line 2041 is lapped with the first gate metal layer signal line 201 through a via hole on the second gate insulating layer 203;
an interlayer dielectric layer (ILD)205, the interlayer dielectric layer 205 being disconnected at the bend region; the interlayer dielectric layer 205 is an inorganic insulating layer, and the bending of the display substrate is facilitated by the disconnection in the bending area;
a first organic layer (PLN1)206 disposed in the bending region, covering the second gate metal layer bridging line 2041, for insulating the second gate metal layer bridging line 2041 from a subsequently formed first source/drain metal layer bridging line 2071, without affecting bending of the bending region;
the first source-drain metal layer comprises a first source-drain metal layer signal line 2072 and a first source-drain metal layer bridging line 2071, and the first source-drain metal layer signal line 2072 is disconnected in the bending region, and the disconnection in the bending region is beneficial to bending of the display substrate; the first source-drain metal layer bridging line 2071 is lapped with the second gate metal layer signal line 2042 through a via hole on the interlayer dielectric layer 205;
a second organic layer (PLN2)208 disposed in the bending region and covering the first source-drain metal layer bridging line 2071;
a second source-drain metal layer bridging line 209, where the second source-drain metal layer bridging line 209 is lapped with the first source-drain metal layer signal line 2072 through a via hole on the second organic layer 208;
a third organic layer (PLN3)210 for use as a planarization layer.
A plurality of light emitting cells 300;
the thin film encapsulation layer covers the light emitting unit 300, the thin film encapsulation layer 400 includes an inorganic encapsulation layer 401, an organic encapsulation layer 402 and an inorganic encapsulation layer 403, and the inorganic encapsulation layer 401, the organic encapsulation layer 402 and the inorganic encapsulation layer 403 are all disconnected in the bending region 10 of the display substrate.
In this embodiment, the inorganic encapsulation layer of the thin film encapsulation layer is broken at the bending region of the foldable display substrate, and the inorganic insulating layer of the bending region is completely or partially broken, so that the bending region is not affected by the stress of the inorganic layer, thereby realizing greatly increased bending (i.e., bending with smaller bending diameter), and simultaneously realizing double-sided bending. Meanwhile, the signal wires in the bending area are disconnected, and the metal wires can be prevented from being broken through the lap joint of the metal bridging wires, so that the service life of the display substrate is prolonged.
Referring to fig. 2, the display substrate in the embodiment may further include: a support (Dam)502, wherein the support 502 is used for supporting a mask plate in a process of evaporating a light emitting layer of the light emitting unit 300, and the support 502 is disconnected in the bending region to avoid the influence of the support on bending.
In the embodiment of the present invention, the organic encapsulation layer in the thin film encapsulation layer can be formed by an inkjet printing method (IPJ). Referring to fig. 2, the display substrate in the embodiment may further include: the spacer 501, the spacer 501 may be a columnar spacer (PS), and the spacer 501 may prevent a material for forming an organic encapsulation layer from overflowing when the organic encapsulation layer is formed by using an inkjet printing process.
Please refer to fig. 3, fig. 3 is a schematic diagram illustrating a distribution manner of the supporting bodies and the spacers on two sides of the bending region according to an embodiment of the present invention, and it can be seen from the diagram that the supporting body 502 is broken in the bending region to avoid the influence of the supporting body on bending, and the spacers 501 are distributed around the light emitting unit to avoid the overflow of the material when the organic package layer is formed. The height of the support body 502 is larger than the spacer 501.
In the embodiment of the present invention, optionally, the supporting body may be formed by a material of a flat layer, a pixel defining layer, and a spacer.
In embodiments of the present invention, optionally, the support body may be formed of a flat layer material, a pixel definition layer material, or a spacer material.
In an embodiment of the present invention, optionally, the spacer may be formed of a pixel defining layer material or a spacer material.
The embodiment of the utility model provides a still provide a collapsible display device, including the collapsible display substrates in any one of the above-mentioned embodiments.
The embodiment of the utility model provides an in foldable display substrates OLED display substrates can.
The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention.
Claims (10)
1. A foldable display substrate, comprising:
the foldable display substrate comprises a flexible substrate, a plurality of light-emitting units arranged on the flexible substrate and a thin film packaging layer covering the light-emitting units, wherein the thin film packaging layer comprises an inorganic packaging layer, and the inorganic packaging layer is disconnected in a bending area of the foldable display substrate.
2. The foldable display substrate of claim 1, wherein the thin film encapsulation layer further comprises an organic encapsulation layer, the organic encapsulation layer being broken at the bend region.
3. The foldable display substrate of claim 2, wherein a groove is formed where the inorganic encapsulation layer and the organic encapsulation layer are disconnected, and a size of a notch of the groove is larger than a size of a groove bottom.
4. The foldable display substrate of claim 1, further comprising:
the flexible circuit board comprises a signal line, an insulating layer and a metal bridging line, wherein the signal line, the insulating layer and the metal bridging line are arranged on the flexible substrate, the signal line is in the state that the bending area is disconnected, the bending area is connected with the metal bridging line in an overlapping mode, and the insulating layer is arranged between the signal line and the metal bridging line.
5. The foldable display substrate of claim 4, wherein the insulating layer is an organic insulating layer.
6. The foldable display substrate of claim 4, wherein the signal line comprises at least one of:
the first gate metal layer signal wire is in lap joint in the bending area through a second gate metal layer bridging wire;
the second gate metal layer signal line is in lap joint in the bending area through a first source-drain metal layer bridging line;
and the first source-drain metal layer signal line is overlapped in the bending region through a bridging line of a second source-drain metal layer.
7. The foldable display substrate of claim 1, further comprising:
at least one inorganic insulating layer arranged on the flexible substrate, wherein at least part of the inorganic insulating layer in the at least one inorganic insulating layer is disconnected in the bending area;
the inorganic insulating layer includes at least one of: a gate insulating layer and an interlayer dielectric layer.
8. The foldable display substrate of claim 1, wherein an orthographic projection of the light emitting unit on the flexible substrate does not overlap with an orthographic projection of the bending region on the flexible substrate.
9. The foldable display substrate of claim 1, comprising in particular:
the flexible substrate;
a first gate insulating layer disconnected at the bending region;
a first gate metal layer signal line that is disconnected at the bend region;
a second gate insulating layer;
the second gate metal layer comprises a second gate metal layer signal line and a second gate metal layer bridging line, the second gate metal layer signal line is disconnected in the bending area, and the second gate metal layer bridging line is in lap joint with the first gate metal layer signal line through a through hole in the second gate insulating layer;
the interlayer dielectric layer is disconnected in the bending area;
the first organic layer is arranged in the bending area and covers the second gate metal layer bridging line;
the first source-drain metal layer comprises a first source-drain metal layer signal line and a first source-drain metal layer bridging line, the first source-drain metal layer signal line is disconnected in the bending area, and the first source-drain metal layer bridging line is in lap joint with the second gate metal layer signal line through a through hole in the interlayer dielectric layer;
the second organic layer is arranged in the bending area and covers the bridging line of the first source drain metal layer;
a second source-drain metal layer bridging line, wherein the second source-drain metal layer bridging line is in lap joint with the first source-drain metal layer signal line through a via hole on the second organic layer;
a third organic layer.
10. A foldable display device, comprising the foldable display substrate according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020001604.9U CN210668428U (en) | 2020-01-02 | 2020-01-02 | Foldable display substrate and foldable display device |
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| CN202020001604.9U CN210668428U (en) | 2020-01-02 | 2020-01-02 | Foldable display substrate and foldable display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115019635A (en) * | 2021-09-30 | 2022-09-06 | 荣耀终端有限公司 | Folding electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115019635A (en) * | 2021-09-30 | 2022-09-06 | 荣耀终端有限公司 | Folding electronic equipment |
| CN115019635B (en) * | 2021-09-30 | 2023-10-27 | 荣耀终端有限公司 | Folding electronic equipment |
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