DISPLAY PANEL, MANUFACTURING METHOD THEREOF AND DISPLAY DEVICE

A display panel, a manufacturing method thereof, and a display device are provided. The display panel includes a driving substrate, a first light-emitting device layer disposed on a side of the driving substrate, and a second light-emitting device layer disposed on a side the driving substrate away from the first light-emitting device layer. The first light-emitting device layer includes a plurality of first light-emitting devices. The second light-emitting device layer includes a plurality of second light-emitting devices. The driving substrate includes a plurality of driving thin-film transistors. A driving thin-film transistor is connected to a first light-emitting device and a second light-emitting device. The first light-emitting device layer and the second light-emitting device layer are respectively disposed on two sides of the driving substrate. A single driving thin-film transistor is configured to drive the first light-emitting device and the second light-emitting device simultaneously to emit light.

CROSS-REFERENCE TO RELATED PATENT APPLICATION

This application claims priority to Chinese patent application No. 202210985629.0, titled “DISPLAY PANEL, MANUFACTURING METHOD THEREOF AND DISPLAY DEVICE”, filed on Aug. 17, 2022, with the China National Intellectual Property Administration, which is incorporated by reference in the present application in its entirely.

FIELD

The present disclosure relates to the field of display technology, and more particularly, to a display panel, a manufacturing method thereof, and a display device.

BACKGROUND

With development of display technology, double-sided display products have received extensive attention.

At present, a double-sided display screen mainly adopts two pieces of display panels, such as liquid crystal display (LCD) panels, light-emitting diode (LED) panels, or organic light-emitting diode (OLED) panels to be stuck together, so as to achieve a double-sided display. A structure as such is likely to lead to a large thickness of the double-sided display screen, which is not suitable for requirements of lightening and thinning for large-sized double-sided display devices.

SUMMARY

The present application provides a display panel, a manufacturing method thereof, and a display device, so as to solve a technical problem of a large thickness of a double-sided display screen.

The present application provides a display panel including a driving substrate; a first light-emitting device layer disposed on a side of the driving substrate, wherein the first light-emitting device layer includes a plurality of first light-emitting devices; and a second light-emitting device layer disposed on a side of the driving substrate away from the first light-emitting device layer, wherein the second light-emitting device layer includes a plurality of second light-emitting devices.

The driving substrate includes a plurality of driving thin-film transistors, and each one of the plurality of driving thin-film transistors is connected to one of the plurality of first light-emitting devices and one of the plurality of second light-emitting devices.

In the display panel provided by the present application, the driving substrate includes a first insulating layer, a second insulating layer disposed on a side of the first insulating layer; a first metal layer disposed on a side of the second insulating layer away from the first insulating layer, wherein the first metal layer includes a first terminal, a second terminal, and a power line that are connected to one of the plurality of first light-emitting devices; and a second metal layer disposed on a side of the first insulating layer away from the second insulating layer, wherein the second metal layer includes a third terminal and a fourth terminal that are connected to one of the plurality of second light-emitting devices.

The first terminal and the third terminal are connected to a drain of one of the plurality of driving thin-film transistors, and the second terminal and the fourth terminal are connected to the power line.

In the display panel provided by the present application, the driving substrate includes a first through hole and a second through hole passing through both the second insulating layer and the first insulating layer, the first terminal is connected to the third terminal through the first through hole, and the second terminal is connected to the fourth terminal through the second through hole.

In the display panel provided by the present application, the first metal layer further includes a source and the drain of one of the plurality of driving thin-film transistors, and the first terminal is connected to the drain.

In the display panel provided by the present application, the driving substrate further includes a third insulating layer disposed between the second insulating layer and the first insulating layer; a third metal layer disposed between the second insulating layer and the third insulating layer, wherein the third metal layer includes a gate of one of the plurality of driving thin-film transistors; and a semiconductor layer disposed between the third insulating layer and the first insulating layer, wherein the semiconductor layer includes an active layer of one of the plurality of driving thin-film transistors, and the source and the drain of one of the plurality of driving thin-film transistors are respectively connected to the active layer.

The second metal layer further includes a light shielding portion, and an orthographic projection of the light shielding portion on the driving substrate in a direction perpendicular to the driving substrate covers an orthographic projection of the active layer on the driving substrate in the direction perpendicular to the driving substrate.

In the display panel provided by the present application, the driving substrate includes a third through hole passing through both the second insulating layer and the first insulating layer, and the source is connected to the light shielding portion through the third through hole.

In the display panel provided by the present application, the display panel further includes a first encapsulation layer and a second encapsulation layer, the first encapsulation layer covers the first light-emitting device layer, and the second encapsulation layer cover the second light-emitting device layer.

Correspondingly, the present application further provides a manufacturing method of a display panel. The manufacturing method includes the steps of providing a base, and forming a driving substrate on the base, wherein the driving substrate includes a plurality of driving thin-film transistors; forming a first light-emitting device layer on a side of the driving substrate away from the base, wherein the first light-emitting device layer includes a plurality of first light-emitting devices; removing the base from the driving substrate; and forming a second light-emitting device layer on a side of the driving substrate away from the first light-emitting device layer, wherein the second light-emitting device layer includes a plurality of second light-emitting devices, and each one of the plurality of driving thin-film transistors is connected to one of the plurality of first light-emitting devices and one of the plurality of second light-emitting devices.

In the manufacturing method of the display panel provided by the present application, the base includes a rigid substrate and a flexible substrate formed on the rigid substrate.

A step of removing the base from the driving substrate includes removing the rigid substrate by a laser removing method; and removing the rigid substrate by a dry etching method.

Correspondingly, the present application further provides a display device, and the display device includes the display panel according to any one of the afore-mentioned embodiments.

In the embodiments of the present application, the first light-emitting device layer and the second light-emitting device layer are respectively disposed on two sides of the driving substrate, and a single one of the plurality of driving thin-film transistors can be configured to drive each of the plurality of first light-emitting devices in the first light-emitting device layer and each of the plurality of second light-emitting devices in the second light-emitting device layer on the front and the back to emit light, simultaneously, which reduces a complexity of the double-sided display structure and achieves lightening and thinning of the double-sided display panel.

DETAILED DESCRIPTION

The technical solution of the present application embodiment will be clarified and completely described with reference accompanying drawings in embodiments of the present application embodiment. Obviously, the present application described parts of embodiments instead of all of the embodiments. Based on the embodiments of the present application, other embodiments which can be obtained by a skilled in the art without creative efforts fall into the protected scope of the present application. In addition, it should be understood that specific implementations described here are only used to illustrate and explain the present application and are not used to limit the present application. In the present application, if no explanation is made to the contrary, orientation words such as “upper” and “lower” usually refer to upper and lower directions of a device in an actual use or a working state and specifically refer to drawing directions in drawings. Also, “inner” and “outer” refer to an outline of the device.

The present application provides a display panel, a manufacturing method thereof, and a display device, which will be described in detail below. It should be noted that the description order of the following embodiments is not intended to limit a preferred order of the embodiments.

Referring toFIG.1, andFIG.3toFIG.6, an embodiment of the present application provides a display panel. The display panel includes: a driving substrate1, a first light-emitting device layer2, and a second light-emitting device layer3.

The first light-emitting device layer2is disposed on a side of the driving substrate1, and the first light-emitting device layer2includes a plurality of first light-emitting devices21.

The second light-emitting device layer3is disposed on a side of the driving substrate1away from the first light-emitting device layer2, and the second light-emitting device layer3includes a plurality of second light-emitting devices31.

The driving substrate1includes a plurality of driving thin-film transistors10, and each of the plurality of driving thin-film transistors10is connected to one of the plurality of first light-emitting devices21and one of the plurality of second light-emitting devices31.

It can be understood that, in this embodiment, the first light-emitting device layer2and the second light-emitting device layer3are respectively disposed on two sides of the driving substrate1, and a single driving thin-film transistor10can be configured to drive each of the plurality of first light-emitting devices21in the first light-emitting device layer2and each of the plurality of second light-emitting devices31in the second light-emitting device layer3at the same time, which reduces a complexity of a double-sided display structure and achieves thinning of a double-sided display panel.

It should be noted that, in addition to a problem of a thickness of a conventional double-sided display screen being large, when the conventional double-sided display screen is formed by laminating two liquid crystal displays, a technical problem of requiring two backlight modules which causes a higher power consumption also occurs. In addition, the conventional double-sided display screen formed by laminating two LED panels also has a lower resolution and is not suitable for close-up viewing. Although a thickness of the conventional double-sided display screen formed by laminating two LED panels can be reduced to a certain extent, processing large-sized OLED displays is more difficult and expensive. In this embodiment, each of the plurality of driving thin-film transistors10is connected to one of the plurality of first light-emitting devices21and one of the plurality of second light-emitting devices31, and each of the plurality of driving thin-film transistors10are configured to adjust working states of each of the plurality of first light-emitting devices21and each of the plurality of second light-emitting devices31. Specifically, each of the plurality of driving thin-film transistors10can be configured to drive each of the plurality of first light-emitting devices21and each of the plurality of second light-emitting devices31to emit light, and the working states of the plurality of first light-emitting devices21and the plurality of second light-emitting devices31can also be switched to other ones of the working states, such as extinguishing, etc. The plurality of first light-emitting devices21and the plurality of second light-emitting devices31are all micro light-emitting diodes (Micro-LEDs), and only a single one of the driving thin-film transistor10is required to drive each of the plurality of first light-emitting devices and each of the plurality of second light-emitting devices31to emit light on a front and a back of the driving substrate1simultaneously, so that the double-sided display panel has advantages of being thin, having high brightness, and having low power consumption.

In an embodiment, references are made toFIG.1, andFIG.3toFIG.6. The driving substrate1further includes:a first insulating layer113;a second insulating layer111disposed on a side of the first insulating layer113;a first metal layer12disposed on a side of the second insulating layer111away from the first insulating layer113, wherein the first metal layer12includes a first terminal121, a second terminal122, and a power line that are connected to one of the plurality of first light-emitting devices21(not shown in the figures); anda second metal layer13disposed on a side of the first insulating layer113away from the second insulating layer111, wherein the second metal layer13includes a third terminal131and a fourth terminal132connected to one of the plurality of second light-emitting devices31.

The first terminal121and the third terminal131are both connected to a drain123of the driving thin-film transistor10, and the second terminal122and the fourth terminal132are connected to the power line.

It can be understood that two pins of the first light-emitting device21are respectively connected to the first terminal121and the second terminal122, and two pins of the second light-emitting device31are respectively connected to the third terminal131and the fourth terminal132. The first metal layer12includes the first terminal121and the second terminal122, i.e., the first terminal121and the second terminal122are arranged in a same layer, which prevents a large height difference between the first terminal121and the second terminal122from affecting connections with the first light-emitting device21. Similarly, the second metal layer13includes the third terminal131and the fourth terminal132for a same reason. That is to say, the third terminal131and the fourth terminal132are arranged in a same layer, so as to prevent a large height difference between the third terminal131and the fourth terminal132from affecting connections with the second light-emitting device31. In addition, the first terminal121and the third terminal131are both connected to the drain123of the driving thin-film transistor10, and the driving substrate1also includes the power line connected to the second terminal122and the fourth terminal132, so that driving the first light-emitting device21and the second light-emitting device31simultaneously through one of the plurality of driving thin-film transistors10can be achieved. Specifically, the power line can be a low-potential constant-voltage power line.

Subsequently, in this embodiment, the first metal layer12further includes the power line, i.e., the power line, the first terminal121, and the second terminal122are arranged in a same layer, and the second terminal122is connected to the power line, i.e., the second terminal122is connected to the power line in a same layer, so that processes for manufacturing a display panel are not increased additionally.

It should be noted that the first metal layer12can include a source124, the drain123, the power line, the first terminal121, and the second terminal122, i.e., the source124, the drain123, the power line, the first terminal121, and the second terminal122can all be arranged in a same layer, the first terminal121and the drain123can be connected in a same layer, the second terminal122is connected to the power line in a same layer, so as to minimize the processes for manufacturing the display panel.

It should be noted that an orthographic projection of the first light-emitting device21and an orthographic projection of the second light-emitting device31on the driving substrate1in a direction perpendicular to the driving substrate1do not overlap with an orthographic projection of the driving thin-film transistor10on the driving substrate1in the direction perpendicular to the driving substrate1. Therefore, the driving substrate1protruding at a position corresponding to the driving thin-film transistor10is prevented from effecting an arrangement of the first light-emitting device21and the second light-emitting device31, which not only ensures a planarization of arrangement positions of the first light-emitting device21and the second light-emitting device31, but also reduces an overall thickness of the display panel.

In an embodiment, referring toFIG.1, the driving substrate1includes a first through hole100and a second through hole200both passing through the second insulating layer111and the first insulating layer113. The first terminal121is connected to the third terminal131through the first through hole100, and the second terminal122is connected to the fourth terminal132through the second through hole200.

It can be understood that the driving substrate1includes the first through hole100and the second through hole200, the first terminal121is connected to the third terminal131through the first through hole100. The first terminal121is connected to the third terminal131through the first through hole100, and the second terminal122is connected to the fourth terminal132through the second through hole200. Through having the first terminal121and the third terminal131connected, any one of the first terminal121and the third terminal131is connected to the drain123of the driving thin-film transistor10, so that the connections between the driving thin-film transistor10and the first light-emitting device21and the second light-emitting device31can be achieved. Similarly, through having the second terminal122and the fourth terminal132connected, any one of the second terminal122and the fourth terminal132is connected to the power line, so that the second terminal122and the fourth terminal132can both be connected to the power line, thereby reducing a complexity of a driving structure for driving the first light-emitting device layer2and the second light-emitting device layer3to emit light by a single one of the driving substrate1.

It should be noted that, the first terminal121and the third terminal131can be disposed at both ends of the first through hole100, respectively, and the second terminal122and the fourth terminal132can be disposed at both ends of the first through hole100, respectively. One of the plurality of first light-emitting devices21can be disposed corresponding to one of the plurality of second light-emitting devices31, so that each of the plurality of first light-emitting devices21and each of the plurality of second light-emitting devices31are symmetrically arranged on two sides of the driving substrate1, thereby ensuring a consistency of resolution and image displayed on two sides of the display panel. Specifically, an orthographic projection of the first terminal121on the driving substrate1in the direction perpendicular to the driving substrate1can be at least partially overlapped with an orthographic projection of the third terminal131on the driving substrate1in the direction perpendicular to the driving substrate1, and an orthographic projection of the second terminal122on the driving substrate1in the direction perpendicular to the driving substrate1can be at least partially overlapped with an orthographic projection of the fourth terminal132on the driving substrate1in the direction perpendicular to the driving substrate1.

In an embodiment, referring toFIG.1, the first metal layer12further includes the source124and the drain123of the driving thin-film transistor10, and the first terminal121is connected to the drain123.

It can be understood that the first metal layer12further includes the source124and the drain123of the driving thin-film transistor10, i.e., the source124, the drain123, the first terminal121, and the second terminal122are arranged in a same layer, and the first terminal121is connected to the drain123, i.e., the first terminal121is connected to the drain123in a same layer, and additional processes of manufacturing the display panel is not required. In addition, the source124, the drain123, the first terminal121, and the second terminal122are arranged in a same layer, so that additional film layers for manufacturing the first terminal121and the second terminal122are not required, thereby preventing a thickness of the display panel from increasing.

In an embodiment, referring toFIG.1, the driving substrate1further includes:a third insulating layer112disposed between the second insulating layer111and the first insulating layer113;a third metal layer14disposed between the second insulating layer111and the third insulating layer112, wherein the third metal layer14includes a gate141of the driving thin-film transistor10; anda semiconductor layer15disposed between the third insulating layer112and the first insulating layer113, wherein the semiconductor layer15includes an active layer151of the driving thin-film transistor10and the source124and the drain123of the driving thin-film transistor10are respectively connected to the active layer151.

The second metal layer13further includes a light shielding portion133, and an orthographic projection of the light shielding portion133on the driving substrate1in the direction perpendicular to the driving substrate1covers an orthographic projection of the active layer151on the driving substrate1in the direction perpendicular to the driving substrate1.

It can be understood that the second insulating layer111, the third insulating layer112, and the first insulating layer113are disposed in a stack, the third metal layer14is disposed between the second insulating layer111and the third insulating layer112, and the semiconductor layer15is disposed between the third insulating layer112and the first insulating layer113. The third metal layer14includes the gate141of the driving thin-film transistor10, the semiconductor layer15includes the active layer151of the driving thin-film transistor10, and the gate141is disposed corresponding to the active layer151. Specifically, the driving thin-film transistor10can have a structure of a top gate, a bottom gate, etc. In this embodiment, taking the driving thin-film transistor10having a top-gate structure as an example, the second insulating layer111is disposed between the third metal layer14and the first metal layer12, the first insulating layer113is disposed between the semiconductor layer15and the second metal layer13, and the second metal layer13includes the light shielding portion133, the third terminal131, and the fourth terminal132, i.e., the light shielding portion133, the third terminal131, and the fourth terminal132are disposed in a same layer, which does not increase the processes for manufacturing the display panel. In addition, the orthographic projection of the light shielding portion133on the driving substrate1in the direction perpendicular to the driving substrate1covers the orthographic projection of the active layer151on the driving substrate1in the direction perpendicular to the driving substrate1, so as to prevent the active layer151from being exposed to external light which affects an electrical performance of the driving thin-film transistor10.

It should be noted that a passivation protection layer16can be further provided on the first metal layer12, and openings161can be defined on the passivation protection layer16corresponding to positions of the first terminal121and the second terminal122. The first light-emitting device21is connected to the first terminal121and the second terminal122in the openings161.

In an embodiment, referring toFIG.1, the driving substrate1includes a third through hole300passing through both the second insulating layer111and the first insulating layer113, and the source124is connected to the light shielding portion133through the third through hole300.

It can be understood that the source124is connected to the light shielding portion133through the third through hole300, and in a process of the driving thin-film transistor10driving the first light-emitting device21and the second light-emitting device31to emit light, the light shielding portion133and the source124have a same potential, which facilitates a formation of a holding capacitor between the light shielding portion133and the gate141, which enhances the electrical performance of the driving thin-film transistor10.

In an embodiment, referring toFIG.1, the display panel further includes a first encapsulation layer4and a second encapsulation layer5. The first encapsulation layer4covers the first light-emitting device layer2, and the second encapsulation layer5covers the second light-emitting device layer3.

It can be understood that, the first encapsulation layer4covers the first light-emitting device layer2, and the first encapsulation layer4is configured to encapsulate the first light-emitting device layer2. The second encapsulation layer5covers the second light-emitting device layer3, and the second encapsulation layer5is configured to encapsulate the second light-emitting device layer3. In addition, a first circular polarizer can be disposed on a side of the first encapsulation layer4away from the second encapsulation layer5, and a second circular polarizer can be disposed on a side of the second encapsulation layer5away from the first encapsulation layer4. Apparently, through an arrangement of the first circular polarizer and the second circular polarizer, reflections of the first metal layer12and the second metal layer13can be prevented from affecting an appearance of the display panel.

Correspondingly, an embodiment of the present application also provides a manufacturing method of a display panel. Referring toFIG.2toFIG.6, the manufacturing method includes the following steps:S100: providing a base6, and forming a driving substrate1on the base6, wherein the driving substrate1includes a plurality of driving thin-film transistors10;S200: forming a first light-emitting device layer2on a side of the driving substrate1away from the base6, wherein the first light-emitting device layer2includes a plurality of first light-emitting devices21;S300: removing the base6from the driving substrate1;S400: forming a second light-emitting device layer3on a side of the driving substrate1away from the first light-emitting device layer2, wherein the second light-emitting device layer3includes a plurality of second light-emitting devices31, and each one of the plurality of driving thin-film transistors10is connected to one of the plurality of first light-emitting devices21and one of the plurality of second light-emitting devices31.

It can be understood that, as shown inFIG.3, in step S100, the base6is provided, and the base6can include a rigid substrate61and a flexible substrate62disposed on the rigid substrate61. The rigid substrate61can be a glass substrate, and a material of the flexible substrate62can be polyimide. The driving substrate1is formed on the base6, and the driving substrate1includes a first insulating layer113, a third insulating layer112, and a second insulating layer111that are sequentially stacked on the base6, a first metal layer12disposed on a side of the second insulating layer111away from the base6, and a second metal layer13disposed between the first insulating layer113and the substrates6. The first metal layer12can include a first terminal121and a second terminal122for connecting with the first light-emitting device21. The second metal layer13can include a third terminal131and a fourth terminal132for connecting with the second light-emitting device31. Furthermore, forming the driving substrate1on the base6includes: forming the second metal layer13on the base6; forming the first insulating layer113covering the second metal layer13on the base6and the second metal layer13; forming the third insulating layer112on the first insulating layer113; forming the second insulating layer111on the third insulating layer112; and, finally, forming the first metal layer12on the second insulating layer111. As shown inFIG.5, in step S300, removing the base6from the driving substrate1includes: removing the rigid substrate61by a laser removing method; and then, removing the flexible substrate62by a dry etching method.

It should be noted that, as shown inFIG.4toFIG.5, after a step of forming the first light-emitting device layer2on the side of the driving substrate1away from the base6, the manufacturing method further includes: forming a first encapsulation layer4covering the first light-emitting device layer2on the driving substrate1and the first light-emitting device layer2. After a step of forming a second light-emitting device layer3on the side of the driving substrate1away from the first light-emitting device layer2, the manufacturing method further includes: forming a second encapsulation layer5covering the second light-emitting device layer3on the side of the driving substrate1away from the first light-emitting device layer2, and further includes a step of binding an integrated circuit (IC) on the driving substrate1, which will not be reiterated herein.

Correspondingly, an embodiment of the present application further provides a display device, wherein the display device includes the display panel described in any one of the afore-mentioned embodiments.

In the embodiments of the present application, the first light-emitting device layer2and the second light-emitting device layer3are respectively disposed on the two sides of the driving substrate1, and a single one of the plurality of driving thin-film transistors10can be configured to drive each of the plurality of first light-emitting devices21in the first light-emitting device layer2and each of the plurality of second light-emitting devices31in the second light-emitting device layer3on the front and the back to emit light, simultaneously, which reduces a complexity of the double-sided display structure and achieves lightening and thinning of the double-sided display panel.

The embodiments provided by the present application is described in detail above, the specific examples of this document are used to explain principles and embodiments of the present application, and the description of embodiments above is only for helping to understand the present application. Meanwhile, those skilled in the art will be able to change the specific embodiments and the scope of the present application according to the idea of the present application. In the above, the content of the specification should not be construed as limiting the present application. Above all, the content of the specification should not be the limitation of the present application.