CN111834418B

CN111834418B - Display panel and electronic device

Info

Publication number: CN111834418B
Application number: CN202010422753.7A
Authority: CN
Inventors: 许晓伟; 刘达; 李俊峰
Original assignee: Kunshan Govisionox Optoelectronics Co Ltd
Current assignee: Beijing Visionox Technology Co Ltd
Priority date: 2020-05-19
Filing date: 2020-05-19
Publication date: 2022-07-12
Anticipated expiration: 2040-05-19
Also published as: CN111834418A

Abstract

The invention relates to a display panel and an electronic device. The display panel comprises a first display area and a second display area which are mutually adjacent, the light transmittance of the first display area is greater than that of the second display area, and the first display area comprises a light-transmitting area; the display panel includes: a substrate; a device layer disposed on the substrate; the planarization layer is arranged on the device layer and comprises a first hole arranged in the light-transmitting area; and a pixel definition layer disposed on the planarization layer and filling the first hole, wherein a transmittance of a material of the pixel definition layer is greater than a transmittance of a material of the planarization layer, and a bending strength of the material of the planarization layer is greater than a bending strength of the material of the pixel definition layer. The invention realizes the optimized balance among the light transmittance, the bending strength and the cost of the display panel.

Description

Display panel and electronic device

Technical Field

The present invention relates to the field of display technologies, and in particular, to a display panel and an electronic device.

Background

Organic Light-Emitting diodes (OLEDs) have the advantages of simple structure, fast response speed, active Light emission, low power consumption, and the like, and have been widely used in the display fields of mobile phones, tablet computers, televisions, and the like.

In order to increase the screen occupation ratio, it has become a trend to dispose a camera below the screen. The imaging effect of the front camera can be ensured only by the enough light transmission quantity in the shooting area under the screen, so that the materials of all film layers in the screen body are made of transparent organic materials. However, most of the existing transparent organic materials are silicon materials, the hardness is high after curing, cracks are easy to occur on a thick layer, the bending resistance is poor, and the functional defect rate is high.

Disclosure of Invention

The invention aims to provide a display panel and an electronic device, wherein the display panel can realize optimal balance among light transmittance, bending strength and cost.

On one hand, the invention provides a display panel, which comprises a first display area and a second display area which are mutually adjacent, wherein the light transmittance of the first display area is greater than that of the second display area, and the first display area comprises a light-transmitting area; the display panel includes: a substrate; a device layer disposed on the substrate; the planarization layer is arranged on the device layer and comprises a first hole arranged in the light-transmitting area; and a pixel defining layer disposed on the planarization layer and filling the first hole, wherein a light transmittance of a material of the pixel defining layer is greater than a light transmittance of a material of the planarization layer, and a bending strength of the material of the planarization layer is greater than a bending strength of the material of the pixel defining layer.

According to one aspect of the invention, the material of the planarization layer includes polyimide; the pixel definition layer is made of hexamethyldisiloxane or epoxy resin.

According to an aspect of the present invention, the first display region further includes a plurality of first light emitting regions arranged in an array, and the light transmission region is located between adjacent first light emitting regions.

According to an aspect of the present invention, the pixel defining layer includes first pixel openings arranged in a first display region array, and the display panel further includes: a first light emitting element, at least a portion of which is located in the corresponding first pixel opening; and the first pixel circuit is arranged on the device layer and electrically connected with the first light-emitting element and used for driving the first light-emitting element to emit light.

According to an aspect of the present invention, the first pixel circuit is located in the first display region, the planarization layer further includes a second hole penetrating a thickness thereof, and the first light emitting element is electrically connected to the first pixel circuit through the second hole.

According to one aspect of the present invention, the first pixel circuit is located in the second display region, the first light emitting element is electrically connected to the first pixel circuit through a signal line, and the signal line is a transparent conductive line at least in the first display region.

According to an aspect of the present invention, the signal line is entirely a transparent wire; or the signal lines comprise a first signal line positioned in the first display area and a second signal line positioned in the second display area, and the first signal line is a transparent conducting wire.

According to one aspect of the invention, a first hole is formed in the planarization layer corresponding to the light-transmissive region.

According to one aspect of the invention, more than two first holes are arranged on the planarization layer corresponding to the light-transmitting area at intervals.

In another aspect, the present invention further provides an electronic device including the display panel as described above.

According to the display panel provided by the invention, the first hole is formed in the planarization layer corresponding to the light-transmitting area of the first display area, the pixel definition layer is used for filling the first hole, the light transmittance of the pixel definition layer is greater than that of the planarization layer, and the bending strength of the planarization layer is greater than that of the pixel definition layer, so that the optimal balance among the light transmittance, the bending strength and the cost of the display panel is realized.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Fig. 1 is a schematic top view of a display panel according to an embodiment of the present invention;

FIG. 2 is a partial enlarged schematic view of the first display region of FIG. 1;

FIG. 3 shows a cross-sectional view along A-A of FIG. 2;

FIG. 4 is a partially enlarged schematic view of a first display area according to an alternative embodiment of the invention;

FIG. 5 shows a cross-sectional view of FIG. 4 along the direction B-B;

fig. 6 is a partially enlarged schematic view of the first light emitting element in fig. 5;

fig. 7 shows a partially enlarged structural view of a region C in fig. 1;

FIG. 8 shows a cross-sectional view of FIG. 7 along the direction D-D;

fig. 9 illustrates a partially enlarged structural view of the second light emitting element in fig. 8;

FIG. 10 illustrates a schematic top view of the planarization layer of FIG. 8;

FIG. 11 illustrates another schematic top view of the planarization layer of FIG. 8;

fig. 12 is a schematic top view of a display panel according to an alternative embodiment of the invention.

Description of reference numerals:

1-a substrate; 2-a device layer;

3-a planarization layer; 3 a-a first planarizing layer; 3 b-a second planarization layer; 31-a first hole; 32-a second hole; 33-transparent signal lines;

4-pixel definition layer; 41-first pixel opening; 42-second pixel opening;

5-a first light emitting element; 51-a first electrode; 52-a second electrode; 53-a first light emitting structure;

6-a first pixel circuit; 7-a buffer layer;

8-a second light emitting element; 81-a third electrode; 82-a fourth electrode; 83-a second light emitting structure;

r1-first display area; r2-second display area; a T-photic zone; e1-first light emitting zone; e2 — second light emitting region.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The following description is given with the directional terms as viewed in the drawings and not intended to limit the invention to the specific structure shown in the drawings. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

On electronic devices such as mobile phones and tablet computers, it is necessary to integrate a photosensitive component such as a front camera, an infrared light sensor, a proximity light sensor, and the like on the side where the display panel is provided. In some embodiments, a transparent display area may be disposed on the electronic device, and the photosensitive component is disposed on the back of the transparent display area, so that full-screen display of the electronic device is achieved under the condition that the photosensitive component is ensured to work normally.

In order to ensure the display effect of the light-transmitting display area, the planarization layer and the pixel definition layer of the display panel are both made of transparent organic materials. At present, most of transparent organic materials with good light transmittance are silicon-based adhesive materials, the light transmittance is about 90% or more, but the cured transparent organic materials have high hardness, are easy to crack in a thick layer such as a planarization layer, and have poor bending resistance. The light transmittance of common organic adhesive materials such as Polyimide (PI) is slightly lower than that of silicon adhesive materials, about 80% -90%, but the common organic adhesive materials have high bending strength and lower cost than the silicon adhesive materials.

If the planarization layer and the pixel defining layer are made of a silicon-based adhesive material, the light transmittance can be satisfied, but the problems of poor bending resistance and high cost are caused. If the planarization layer and the pixel definition layer are made of common organic materials, although the bending resistance is high and the cost is low, the light transmittance is difficult to meet the growing requirement of the visual experience.

To solve the above problems, embodiments of the present invention provide a display panel and an electronic device. Embodiments of the display panel will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic top view illustrating a display panel according to an embodiment of the present invention, fig. 2 is a schematic partially enlarged view illustrating a first display region of fig. 1, and fig. 3 is a cross-sectional view of fig. 2 taken along a direction a-a.

As shown in fig. 1 and 2, the display panel according to the embodiment of the present invention includes a first display region R1 and a second display region R2 adjacent to each other, wherein a light transmittance of the first display region R1 is greater than a light transmittance of the second display region R2, and the first display region R1 includes a light-transmitting region T.

The display panel may be an Organic Light Emitting Diode (OLED) display panel. Alternatively, the light transmittance of the first display region R1 is 15% or more. In order to ensure that the light transmittance of the first display region R1 is greater than 15%, even greater than 40%, or even higher, the light transmittance of each functional film layer of the first display region R1 in this embodiment is greater than 80%, and even at least a portion of the functional film layers is greater than 90%.

The light transmittance of the first display area R1 is greater than that of the second display area R2, so that the display panel can integrate the photosensitive assembly on the back of the first display area R1, for example, the photosensitive assembly of a camera is integrated under a screen, and meanwhile, the first display area R1 can display pictures, so that the display area of the display panel is increased, and the comprehensive screen design of the electronic equipment is realized.

As shown in fig. 3, the display panel in the embodiment of the present invention includes a substrate 1, a device layer 2, a planarization layer 3, and a pixel defining layer 4, which are stacked.

The substrate 1 may be at least one of a glass substrate, a PI thin film, and a high-transmittance plastic plate. Alternatively, the substrate 1 includes two different materials, such as an organic material such as a PI thin film and an inorganic material such as a high-transmittance plastic plate, which are stacked and alternately disposed, and the material of the outermost layer of the substrate 1 is an organic material.

The device layer 2 includes pixel circuits for driving the display of the respective light emitting elements. In some embodiments, the display panel further comprises a buffer layer 7, the buffer layer 7 being disposed between the substrate 1 and the device layer 2. The buffer layer 7 may include SiNx and SiOx to form an insulating film layer with good compactness and flatness.

The planarization layer 3 is disposed on the device layer 2, the pixel definition layer 4 is disposed on the planarization layer 3, the pixel definition layer 4 includes pixel openings, and at least a portion of the light emitting elements are located in the corresponding pixel openings. In some embodiments, the display panel further includes a film encapsulation layer, and the film encapsulation layer is coated on the pixel defining layer 4 and the film layer where the light emitting element is located, so as to effectively prevent the internal structure of the display panel from being corroded by water and oxygen, and effectively improve the service life of the display panel.

The first display region R1 includes a light-transmissive region T, and the planarization layer 3 includes a first hole 31 disposed in the light-transmissive region T. The pixel defining layer 4 is disposed on the planarization layer 3 and fills the first hole 31. The light transmittance of the material of the pixel defining layer 4 is greater than the light transmittance of the material of the planarization layer 3, and the bending strength of the material of the planarization layer 3 is greater than the bending strength of the material of the pixel defining layer 4.

As described above, in order to optimally balance the transmittance, the bending strength and the cost of the first display region R1, the pixel defining layer 4 may be made of a silicon-based adhesive material with a higher transmittance and a slightly lower bending strength, and the planarization layer 3 may be made of a common organic adhesive material with a slightly lower transmittance and a slightly higher bending strength.

Optionally, the material of the planarization layer 3 includes Polyimide (Polyimide PI). Since PI has excellent high and low temperature resistance, electrical insulation, adhesion, radiation resistance, and dielectric resistance, the planarization layer 3 thus produced has good flexibility. The material of the planarization layer 3 may also be other common organic glue materials with a light transmittance of 80% -90%.

Alternatively, the pixel defining layer 4 may be made of hexamethyldisiloxane or epoxy resin, or may be made of other silicon-based materials with a light transmittance of 90% or more.

In order to further improve the light transmittance of the first display region R1, the planarization layer 3 corresponding to the light transmissive region T of the first display region R1 is provided with a first hole 31, and the first hole 31 is filled with the pixel defining layer 4 having a higher light transmittance. Therefore, the planarization layer 3 and the pixel definition layer 4 are made of transparent materials with different characteristics, and the planarization layer 3 corresponding to the transparent region T is further provided with the first hole 31 filled through the pixel definition layer 4, so that the first display region R1 has relatively high light transmittance, relatively high bending strength and relatively low cost as a whole.

In the display panel provided in the embodiment of the present invention, the first hole 31 is disposed on the planarization layer 3 corresponding to the light-transmitting region T of the first display region R1, the first hole 31 is filled with the pixel defining layer 4, the light transmittance of the material of the pixel defining layer 4 is greater than the light transmittance of the material of the planarization layer 3, and the bending strength of the material of the planarization layer 3 is greater than the bending strength of the material of the pixel defining layer 4, so that the optimal balance among the light transmittance, the bending strength and the cost of the display panel is achieved.

Fig. 4 illustrates a partially enlarged structural view of a first display region according to an alternative embodiment of the present invention, fig. 5 illustrates a cross-sectional view of fig. 4 taken along a direction B-B, and fig. 6 illustrates a partially enlarged structural view of a first light emitting element of fig. 5.

The first display region R1 further includes a plurality of first light-emitting regions E1 arranged in an array, and the light-transmitting region T is located between adjacent first light-emitting regions E1. As shown in fig. 4, the first display region R1 includes six first light-emitting regions E1 arranged in three rows and two columns and three light-transmitting regions T arranged in one column, the three light-transmitting regions T being located between two adjacent columns of the first light-emitting regions E1. The light transmission region T and the first light emitting region E1 are avoided from each other, so that the first display region R1 can achieve higher light transmittance while still having a higher display effect.

In the embodiment of the present invention, the pixel defining layer 4 includes the first pixel openings 41 arranged in the first display region R1 in an array, the display panel further includes the first light emitting elements 5 and the first pixel circuits 6, and at least a portion of the first light emitting elements 5 is located in the corresponding first pixel openings 41. The first pixel circuit 6 is disposed on the device layer 2, and the first pixel circuit 6 is electrically connected to the first light emitting element 5 and is configured to drive the first light emitting element 5 to emit light.

At least a portion of the first light emitting element 5 is located in the corresponding first pixel opening 41 to form a first light emitting region E1. As shown in fig. 5, the first display region R1 shows a boundary between the light-transmitting region T and the first light-emitting region E1 in a dotted line.

As shown in fig. 6, the first light emitting element 5 includes a first electrode 51, a first light emitting structure 53 on the first electrode 51, and a second electrode 52 on the first light emitting structure 53.

One of the first electrode 51 and the second electrode 52 is an anode, and the other is a cathode. Here, the first electrode 51 is taken as an anode, and the second electrode 52 is taken as a cathode.

In some embodiments, the first electrode 51 is a light transmissive electrode. In some embodiments, the first electrode 51 includes an Indium Tin Oxide (ITO) layer or an Indium Zinc Oxide (IZO) layer. In some embodiments, the first electrode 51 is a reflective electrode, so that the display effect of the formed first light emitting element 5 is better. The reflective electrode includes a first light-transmitting conductive layer, a reflective layer on the first light-transmitting conductive layer, and a second light-transmitting conductive layer on the reflective layer. The first and second transparent conductive layers may be ITO, IZO, etc., and the reflective layer may be a metal layer, such as made of silver.

The first light Emitting structure 53 may include a Hole Transport Layer (HTL), an Emitting Layer (EML), and an Electron Transport Layer (ETL). The light-emitting layer is arranged on the hole transport layer, and the electron transport layer is arranged on the light-emitting layer. The formed first light emitting elements 5 may be classified into a plurality of types according to colors of EMLs.

In one example, the first light emitting elements 5 include a red light emitting first light emitting element 5, a green light emitting first light emitting element 5, and a blue light emitting first light emitting element 5, although not limited thereto in other examples. The first light emitting structure 53 may further include at least one of a Hole Injection Layer (HIL), a Hole Transport Layer (HTL), an Electron Injection Layer (EIL), or an Electron Transport Layer (ETL) according to design requirements of the first light emitting element 5.

The first pixel circuit 6 includes a gate, a source, and a drain disposed in the device layer 2. When a positive voltage is applied to the gate electrode, an electric field is generated between the gate electrode and the semiconductor layer, and an electron flow channel is formed under the action of the electric field, so that a conduction state is formed between the source electrode and the drain electrode. The larger the voltage applied to the gate, the more electrons are attracted, and therefore the larger the on current. When a negative voltage is applied to the gate, an off state is formed between the source and the drain.

The first electrode 51 of each first light emitting element 5 may be electrically connected to a corresponding first pixel circuit 6 in the device layer 2 to drive the first light emitting element 5 to emit light.

In one example, as shown in fig. 4 and 5, the first display region R1 is provided with two columns of light-transmitting regions T and two columns of first light-emitting regions E1, and the light-transmitting regions T and the first light-emitting regions E1 are staggered in the row direction. In the adjacent light-transmitting region T and the first light-emitting region E1, the planarization layer 3 corresponding to the first light-emitting region E1 is provided with a second hole 32 penetrating through the thickness thereof, the device layer 2 corresponding to the first light-emitting region E1 is provided with the first pixel circuit 6 as described above, and the first light-emitting element 5 corresponding to the first pixel opening 41 of the first light-emitting region E1 is electrically connected to the first pixel circuit 6 through the second hole 32, so that the first display region R1 has a high light transmittance to implement functions of image pickup and the like, and can also display information of images, characters and the like together with the second display region R2, thereby implementing full-screen display of the electronic device.

Fig. 7 shows a partially enlarged schematic structure of a region C in fig. 1, and fig. 8 shows a cross-sectional view of fig. 7 in a direction D-D.

In some embodiments, the second display region R2 is an active matrix driving display region, and the second light emitting elements 8 drive display through the respective corresponding second pixel circuits (not shown in the figure). The second display region R2 includes a plurality of second light emitting regions E2 arranged in an array, the pixel defining layer 4 includes second pixel openings 42 arranged in an array in the second display region R2, and at least a portion of the second light emitting element 8 is located in the corresponding second pixel opening 42 to form a second light emitting region E2.

As shown in fig. 7 and 8, a boundary between the first display region R1 and the second display region R2 is shown by a broken line. The first pixel circuit 6 is disposed between the second light emitting region E2 of the second display region R2 and the region adjacent to the light transmitting region T of the first display region R1. The first light emitting elements 5 in the first light emitting region E1 adjacent to the first display region R1 can drive display by the first pixel circuits 6 located in the second display region R2.

Specifically, the first pixel circuit 6 is located in the second display region R2, the first light emitting element 5 is electrically connected to the first pixel circuit 6 through the signal line 33, and the signal line 33 is a transparent conductive line at least in the first display region R1.

As shown in fig. 8, the boundaries between the first light-emitting region E1, the light-transmitting region T of the first display region R1 and the second light-emitting region E2 of the second display region R2 are shown by broken lines, respectively. The first pixel circuit 6 is located in the second light emitting region E2 of the second display region R2 and the adjacent region of the light transmitting region T, the planarization layer 3 is further provided with a signal line 33, one end of the signal line 33 is electrically connected to the first pixel circuit 6, and the other end of the signal line 33 is electrically connected to the first light emitting element 5 in the first light emitting region E1, so as to drive the first light emitting element 5 to emit light. The signal line 33 is a transparent wire at least in the first display region R1, which can prevent the display panel from generating a screen window effect, so that the first display region R1 has a high light transmittance to realize functions such as image capture, and can also display information such as images and characters together with the second display region R2, thereby realizing full-screen display of the electronic device.

Alternatively, the signal line 33 is a transparent conductive line, and is made of a transparent material, such as Indium Tin Oxide (ITO), which has good conductivity and transparency, and a resistivity close to that of metal, and can cut off electron radiation, ultraviolet rays, and far infrared rays harmful to human body.

Optionally, the signal lines 33 include a first signal line located in the first display region R1 and a second signal line located in the second display region R2, where the first signal line is a transparent conductive line and is made of a transparent material, such as ITO. The material of the second signal line may be a metal with low resistivity, such as copper, aluminum, and the like.

Thus, the planarization layer 3 may be formed in layers, for example, by forming the first planarization layer 3a, then laying the signal line 33 on the first planarization layer 3a, and then forming the second planarization layer 3 a. The signal line 33 is connected between the first light emitting element 5 and the first pixel circuit 6, and may be a transparent wire as a whole, as shown in fig. 8. In addition, the signal lines 33 may be disposed in the first planarization layer 3a in a segmented manner, wherein a portion corresponding to the first display region R1 is a transparent conductive line, and a portion corresponding to the second display region R2 is a non-transparent conductive line made of a metal material.

Optionally, the planarization layer 3 may also be laid in a whole layer, that is, the signal line 33 is laid on the device layer 2 first, and then the planarization layer 3 in the whole layer is laid, or the planarization layer 3 is laid on the device layer 2 first, and then the signal line 33 is laid on the planarization layer 3, where the signal line 33 may be a transparent conductive line as a whole, or may be arranged in segments, as long as it is ensured that the first pixel circuit 6 is electrically connected to the first light emitting element 5 through the signal line 33, and details will not be described.

Fig. 9 illustrates a partially enlarged structural view of the second light emitting element in fig. 8.

As shown in fig. 9, the pixel defining layer 4 includes second pixel openings 42 arranged in an array in the second display region R2, and the second light emitting elements 8 of the second display region R2 include third electrodes 81, second light emitting structures 83 on the third electrodes 81, and fourth electrodes 82 on the second light emitting structures 83. The second pixel opening 42 receives the second light emitting structure 83. In one example, the second light emitting structure 83 includes a red second light emitting structure 83, a green second light emitting structure 83, and a blue second light emitting structure 83.

In some embodiments, the size of the first light emitting structure 53 is smaller than that of the second light emitting structure 83 of the same color, so that the first display region R1 has enough area to arrange a high light transmission region, increasing the light transmittance of the first display region R1.

Further, in some embodiments, the ratio of the size of the first light emitting structure 53 to the size of the second light emitting structure 83 of the same kind is 0.25 to 0.6, and the ratio is configured to balance the light transmittance and the lifetime of the first display region R1, so as to obtain the first display region R1 with sufficient light transmittance and lifetime.

In some embodiments, the material and thickness of the first electrode 51 are the same as those of the third electrode 81, and the material and thickness of the second electrode 52 are the same as those of the fourth electrode 82, so that the electrode structure of the first light emitting element 5 in the first display region R1 and the electrode structure of the second light emitting element 8 in the second display region R2 tend to be the same, and further, the color coordinates and the same-viewing-angle brightness of the first display region R1 and the second display region R2 tend to be the same, thereby improving the display uniformity of the display panel.

It is to be understood that, in the foregoing embodiments, the second display region R2 of the display panel is disposed around the first display region R1, that is, the first display region R1 is designed offshore. In other embodiments, the first display region R1 and the second display region R2 may have other positional relationships.

Fig. 10 shows a schematic top view of the planarization layer of fig. 8, and fig. 11 shows a schematic top view of the planarization layer of fig. 8.

As shown in fig. 10, a boundary between the first display region R1 and the second display region R2 is shown by one broken line, and a boundary between the light-transmitting region T and the first light-emitting region E1 is shown by another broken line. The planarization layer 3 corresponding to the light-transmitting region T is provided with a first hole 31, the first hole 31 is located in most of the light-transmitting region T, and the first hole 31 is filled with a silicon-based adhesive material with higher light transmittance of the pixel defining layer 4, so that the light transmittance of the first display region R1 is improved.

As shown in fig. 11, a boundary between the first display region R1 and the second display region R2 is shown by one broken line, and a boundary between the light-transmitting region T and the first light-emitting region E1 is shown by another broken line. The planarization layer 3 corresponding to the light-transmitting region T is provided with two or more first holes 31, for example, three first holes 31 in fig. 11, which are distributed at intervals. Optionally, the two or more first holes 31 are uniformly distributed in the light-transmitting region T and are filled with the silicon-based adhesive material with higher light transmittance of the pixel defining layer 4, so as to improve the light-transmitting uniformity of the first display region R1.

FIG. 12 shows a schematic top view of a display panel according to an alternative embodiment of the invention.

As shown in fig. 12, the display panel of the alternative embodiment includes a first display region R1 and a second display region R2, and the light transmittance of the first display region R1 is greater than that of the second display region R2. The first display region R1 is disposed on a side edge of the second display region R2, i.e. the second display region R2 is disposed around a portion of the periphery of the first display region R1.

In addition, the embodiment of the invention also provides an electronic device which comprises any one of the display panels. The electronic equipment can be a mobile phone, a tablet computer, a wearable device and the like.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. A display panel is characterized by comprising a first display area and a second display area which are adjacent to each other, wherein the light transmittance of the first display area is greater than that of the second display area, and the first display area comprises a light-transmitting area; the display panel includes:

a substrate;

a device layer disposed on the substrate;

a planarization layer disposed on the device layer, the planarization layer including a first hole disposed in the light transmissive region; and

and the pixel defining layer is arranged on the planarization layer and fills the first hole, wherein the light transmittance of the material of the pixel defining layer is greater than that of the material of the planarization layer, and the bending strength of the material of the planarization layer is greater than that of the material of the pixel defining layer.

2. The display panel according to claim 1, wherein the material of the planarization layer comprises polyimide; the pixel definition layer is made of hexamethyldisiloxane or epoxy resin.

3. The display panel of claim 1, wherein the first display region further comprises a plurality of first light emitting regions arranged in an array, and the light-transmitting regions are located between adjacent first light emitting regions.

4. The display panel of claim 1, wherein the pixel definition layer comprises first pixel openings arranged in the first array of display regions, the display panel further comprising:

a first light emitting element, at least a portion of which is located in the corresponding first pixel opening;

the first pixel circuit is arranged on the device layer, is electrically connected with the first light-emitting element and is used for driving the first light-emitting element to emit light.

5. The display panel according to claim 4, wherein the first pixel circuit is located in the first display region, wherein the planarization layer further comprises a second hole penetrating a thickness thereof, and wherein the first light emitting element is electrically connected to the first pixel circuit through the second hole.

6. The display panel according to claim 4, wherein the first pixel circuit is located in the second display region, the first light-emitting element is electrically connected to the first pixel circuit through a signal line, and the signal line is a transparent conductive line at least in the first display region.

7. The display panel according to claim 6, wherein the signal lines are entirely transparent conductive lines; or, the signal lines comprise a first signal line positioned in the first display area and a second signal line positioned in the second display area, and the first signal line is a transparent conducting wire.

8. The display panel according to claim 1, wherein the planarization layer corresponding to the light-transmitting region has one first hole.

9. The display panel of claim 1, wherein the planarization layer corresponding to the light-transmissive region has two or more first holes spaced apart from each other.

10. An electronic device characterized by comprising the display panel according to any one of claims 1 to 9.