WO2018201828A1

WO2018201828A1 - Display substrate and display apparatus

Info

Publication number: WO2018201828A1
Application number: PCT/CN2018/080904
Authority: WO
Inventors: 吴建鹏; 罗昶
Original assignee: 京东方科技集团股份有限公司; 成都京东方光电科技有限公司
Priority date: 2017-05-05
Filing date: 2018-03-28
Publication date: 2018-11-08
Also published as: CN107068727A

Abstract

A display substrate, comprising: a substrate (10), the substrate comprising a display area (area A) and a non-display area (area B) surrounding the display area, a plurality of light emitting units (13) being arranged in the display area, and a signal line (14) being arranged in the non-display area; a first electrode layer (11) arranged above the substrate and comprising an electrode part (11a) and a transmission part (11b), the electrode part being positioned in the display area and being arranged above the plurality of light emitting units, and the transmission part being positioned in the non-display area and being arranged on the upper surface of the signal lines, the area of the contact surface of the overlapping part of the signal lines and the transmission part being greater than the orthographic projection area of the contact surface on the substrate. Correspondingly, also provided is a display apparatus.

Description

Display substrate and display device

The present disclosure claims priority to Chinese Patent Application No. JP-A No. No. No. No. No. No. No. No. No. No. No. No. No. No. No.

Technical field

The present disclosure relates to the field of display technologies, and in particular, to a display substrate and a display device.

Background technique

Organic Light Emitting Diode (OLED) devices have attracted much attention due to their advantages of self-luminous, rich color, fast response, wide viewing angle, light weight, thin thickness, low power consumption, and flexible display. Organic electroluminescent display devices made using organic electroluminescent devices therefore have great application prospects.

Summary of the invention

An aspect of the present disclosure provides a display substrate including: a substrate including a display area in which a plurality of light emitting units are disposed, and a non-display area surrounding the display area, a signal line is disposed in the non-display area; a first electrode layer is disposed above the substrate and includes an electrode portion and a transmission portion, the electrode portion is located in the display region and disposed in the plurality of light emitting units Upper, the transmission portion is located in the non-display area and disposed on an upper surface of the signal line, wherein an area of a contact surface of the signal line and an overlapping portion of the transmission portion is larger than the contact surface The area of orthographic projection on the substrate.

In one embodiment, an insulating layer is further disposed above the substrate, and the light emitting unit is disposed above the insulating layer, and a surface area of the portion of the insulating layer corresponding to the transmitting portion is larger than the portion in the The area of orthographic projection on the substrate.

In one embodiment, the signal line is a film layer having a uniform thickness distribution and is formed on an upper surface of the insulating layer.

In one embodiment, a surface of a portion of the insulating layer corresponding to the transfer portion is a surface having protrusions and depressions.

In one embodiment, the surface having the protrusions and depressions is a curved surface.

In one embodiment, a second electrode corresponding to the light emitting unit is further disposed on the upper surface of the insulating layer, and the light emitting unit is disposed on an upper surface of the corresponding second electrode.

In one embodiment, the second electrode and the signal line are made of the same material.

In one embodiment, the second electrode and the signal line are disposed in the same layer.

In one embodiment, the display substrate further includes a pixel defining layer disposed over the insulating layer, the pixel defining layer being located in the display area.

In one embodiment, a plurality of openings penetrating the pixel defining layer are disposed in the pixel defining layer, the openings are in one-to-one correspondence with the light emitting units, and the light emitting units are disposed in the corresponding openings.

In one embodiment, the signal line is made of a metallic material.

In one embodiment, the signal line is a low level signal line.

The present disclosure also provides a display device including the above display substrate provided by the present disclosure.

In one embodiment, the display device further includes a cover plate disposed opposite the display substrate.

In one embodiment, a sealant is disposed between the display substrate and the cover, the sealant is located in the non-display area, and the signal line is located in the display area and the cover frame Between the glues.

In one embodiment, the display device is a cell phone, a display, a tablet, an electronic paper, or an electronic photo frame.

DRAWINGS

The drawings are intended to provide a further understanding of the disclosure, and are in the In the drawing:

1 is a partial structural schematic view of an array substrate;

Figure 2 is a schematic view of the contact portion of the first electrode layer and the signal line of Figure 1;

3 is a schematic diagram of area division of a display substrate according to an embodiment of the present disclosure;

4 is a partial structural schematic view of a display substrate according to an embodiment of the present disclosure;

Figure 5 is a schematic view of the contact portion of the first electrode layer and the signal line of Figure 4;

FIG. 6 is a schematic structural diagram of a display device according to an embodiment of the present disclosure.

detailed description

The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are not to be construed

1 is a schematic view showing the structure of a display substrate in an organic electroluminescence display device, and FIG. 2 is a schematic view showing a contact portion of the first electrode layer and the signal line in FIG. As shown in FIGS. 1 and 2, a plurality of light emitting units 13 are disposed above the substrate, and the plurality of light emitting units 13 share a first electrode layer 11, and each of the light emitting units 13 corresponds to one second electrode 12. After a driving voltage is applied to the second electrode 12 and the first electrode layer 11, a current is formed between the first electrode layer 11 and the second electrode 12, and flows through the light emitting layer of the light emitting unit 13 to realize light emission and display. A signal line 14 that supplies a voltage to the first electrode layer 11 is disposed in the non-display area, and a portion of the first electrode layer 11 is disposed on the surface of the signal line 14 to effect electrical connection.

In the structural arrangement shown in FIGS. 1 and 2, if the width of the signal line 14 is small, the implementation of the narrow bezel is facilitated, but the contact area of the first electrode layer 11 with the signal line 14 is small, and the contact resistance is increased. , thereby increasing the resistance voltage drop and increasing the power consumption of the display device. If the resistance voltage drop is to be reduced, the contact area between the first electrode layer 11 and the signal line 14 is increased, and since the length of the signal line 14 is constant, the increase of the contact area requires an increase in the signal line 14. The width is such that a narrow border cannot be achieved.

As an aspect of the present disclosure, a display substrate is provided. 3 is a schematic view showing division of regions on the array substrate provided by the present disclosure; FIG. 4 is a partial structural view of the array substrate; and FIG. 5 is a schematic diagram of a contact portion of the first electrode layer and the signal line in FIG. As shown in FIGS. 3 to 5, the display substrate includes a substrate 10 including a display area (A area) and a non-display area (B area) surrounding the display area, and a non-display area (B area). A signal line 14 is disposed therein, and a plurality of light emitting units 13 are disposed in the display area (A area). A first electrode layer 11 is further disposed above the substrate 10, and the first electrode layer 11 includes an electrode portion 11a and a transfer portion 11b. The electrode portion 11a is located in the display area (A area) and disposed above the plurality of light emitting units 13, and the transmission portion 11b is located in the non-display area (B area) and disposed on the upper surface of the signal line 14, wherein the signal line 14 and the transmission portion The area of the contact surface of the overlapping portion of 11b is larger than the orthographic area of the contact surface on the substrate 10.

On the one hand, the larger the area where the first electrode layer 11 is in contact with the signal line 14, the smaller the contact resistance between the first electrode layer 11 and the signal line 14, and the smaller the resistance drop; The contact surface of the electrode layer 11 and the signal line 14 is located in the non-display area, and the smaller the width of the orthographic projection of the contact surface on the substrate 10, the smaller the width of the non-display area occupied by the signal line 14 is, which is advantageous for the narrow border. Implementation. In the present disclosure, since the area of the contact surface of the signal line 14 and the transmission portion 11b of the first electrode layer 11 is larger than the orthographic projection area of the contact surface on the substrate 10, the signal line 14 in the present disclosure remains When the length is constant and the width of the occupied non-display area is constant, the contact area of the first electrode layer 11 and the signal line 14 is larger, thereby reducing the contact resistance and further reducing the resistance voltage drop. Therefore, the display substrate provided by the present disclosure can achieve both a narrow bezel and a reduced resistance drop.

The light emitting unit 13 may be an organic electroluminescent diode (OLED). A pixel defining layer 15 is also disposed over the substrate 10. As shown in FIG. 4, the pixel defining layer 15 is located in the display area (A area), and the pixel defining layer 15 is provided with a plurality of openings penetrating the pixel defining layer 15, the openings are in one-to-one correspondence with the light emitting unit 13, and the light emitting unit 13 Set in the corresponding opening. A second electrode 12 corresponding to the light-emitting unit 13 may be disposed under the light-emitting unit 13, and the first electrode layer 11 and the second electrode 12 are respectively a cathode and an anode of the light-emitting unit 13. When positive and negative electric signals are respectively applied to the second electrode 12 and the first electrode layer 11, the light emitting unit 13 emits light. A thin film transistor and an insulating layer 16 are further disposed on the substrate 10, and the thin film transistors are in one-to-one correspondence with the light emitting unit 13. The second electrode 12 is disposed on the upper surface of the insulating layer 16, the light emitting unit 13 is disposed on the upper surface of the corresponding second electrode 12, and the second electrode 12 is connected to the drain of the lower thin film transistor through a via penetrating through the insulating layer 16. The upper surface of the insulating layer 16 on the display area may be provided as a flat surface to facilitate the arrangement of the second electrode 12.

The present disclosure may employ different ways such that the area of the contact surface of the signal line 14 with the transmission portion 11b is larger than the orthographic area of the contact surface on the substrate 10. For example, when the signal line layer 14 is on a flat surface, the upper surface of the signal line 14 is set as an uneven surface. Alternatively, the surface area of the portion of the insulating layer 16 corresponding to the transfer portion 11b is larger than the orthographic projection area of the portion on the substrate 10. The signal line 14 is formed on the upper surface of the insulating layer 16 and is a film layer having a uniform thickness. Further, as shown in FIGS. 4 and 5, the surface of the portion of the insulating layer 16 corresponding to the transfer portion 11b is a surface having the projections 18 and the recesses 19. Forming a surface having protrusions and depressions on the insulating layer 16 may be formed by directly exposing the insulating layer 16 through a half-tone mask and performing development. Thus, the partial thicknesses of the insulating layers 16 corresponding to the semi-transmissive regions, the all-transmissive regions, and the opaque regions of the developed halftone mask are respectively different, thereby forming protrusions and depressions. The manner in which the recesses and the bumps are formed on the insulating layer 16 does not require etching as compared with the surface in which the upper surface of the signal line 14 is set to be uneven, and the shape of the formed bumps and recesses is more easily controlled. In addition, when the array substrate is applied to the display device, the arrangement of the recesses and the protrusions makes the path of the outside water vapor entering the inside of the display device longer, effectively preventing the lateral intrusion of the water vapor, and prolonging the service life of the display device.

Further, the surfaces of the protrusions 18 and the recesses 19 are both curved surfaces, such as curved surfaces. In the case where the surface is provided with the arcuate projections and recessed insulating layers 16, the upper surface of the portion of the insulating layer 16 corresponding to the transport portion 11b is disposed in a wave shape along the length direction and/or the width direction of the signal line 14. A surface having a smooth transition prevents the signal line 14 and the first electrode layer 11 from being broken when the signal line 14 and the first electrode layer 11 are subsequently formed. In practical applications, the height difference between the bumps and the recesses may be set according to a specific product, so that the contact area of the signal line 14 and the first electrode layer 11 is increased as much as possible while the width of the signal line 14 is constant, and at the same time, The first electrode layer 11 is broken.

Of course, the surface of the portion of the insulating layer 16 corresponding to the transfer portion 11b may be provided as an inclined slope, so that the surface area of the portion of the insulating layer 16 corresponding to the transfer portion 11b may be made larger than the orthographic projection of the portion on the substrate 10. area.

In the present disclosure, the second electrode 12 may be an anode, and the first electrode layer 11 may be a cathode. Accordingly, the signal line 14 is a low level signal line. Further, the second electrode 12 is disposed on the upper surface of the insulating layer 16, and the second electrode 12 and the signal line 14 are composed of the same material. That is, the second electrode 12 and the signal line 14 are disposed in the same layer and have the same material, so that the second electrode 12 and the signal line 14 can be fabricated by the same step patterning process, thereby reducing process steps, improving production efficiency, and reducing production cost. Further, the signal line 14 is made of a metal material to lower the resistance of the signal line 14, thereby reducing the power consumption of the display device.

As another aspect of the present disclosure, there is provided a display device including the above display substrate. FIG. 6 is a schematic structural diagram of a display device according to an embodiment of the present disclosure, wherein the display device further includes a cover 20 disposed opposite to the display substrate. As shown in FIG. 3, FIG. 4 and FIG. 6, a sealant 17 is disposed between the organic electroluminescent display substrate and the cover 20, and the sealant 17 is located in the non-display area (B area), and the signal is The line 14 is located in the C area between the display area (A area) and the sealant 17 of the seal.

The display device may be a product or device having a display function, such as a mobile phone, a display, a tablet computer, an electronic paper, an electronic photo frame, or the like.

As can be seen from the above description of the display substrate and the display device provided by the present disclosure, the area of the contact surface of the signal line on the display substrate with the transfer portion of the first electrode layer is larger than the orthographic projection area of the contact surface on the substrate, Thereby, the resistance voltage drop can be reduced while achieving a narrow bezel. And the surface of the portion corresponding to the transmission portion of the insulating layer and the first electrode layer is provided as a surface having protrusions and depressions and the surfaces having the protrusions and depressions are all curved surfaces, thereby simplifying the manufacturing process and preventing the first The electrode layer and the signal line are broken. At the same time, it is also possible to prevent outside water vapor from entering the inside of the display device and prolong the life of the display device.

It is to be understood that the above embodiments are merely exemplary embodiments employed to explain the principles of the present disclosure, but the present disclosure is not limited thereto. Various modifications and improvements can be made by those skilled in the art without departing from the spirit and scope of the disclosure, and such modifications and improvements are also considered to be within the scope of the disclosure.

Claims

A display substrate comprising:

a substrate, the substrate comprising:

a display area in which a plurality of light emitting units are disposed, and

a signal line is disposed in the non-display area around the non-display area of the display area;

a first electrode layer disposed above the substrate and including an electrode portion located in the display region and disposed above the plurality of light emitting units, the transfer portion being located at the non- In the display area and disposed on the upper surface of the signal line,

Wherein an area of a contact surface of the signal line and an overlapping portion of the transmission portion is larger than an orthographic projection area of the contact surface on the substrate.
The display substrate according to claim 1, wherein an insulating layer is further disposed above the substrate, the light emitting unit is disposed above the insulating layer, and a surface area of a portion of the insulating layer corresponding to the transfer portion is larger than The orthographic area of the portion on the substrate.
The display substrate according to claim 2, wherein the signal line is a film layer having a uniform thickness and is formed on an upper surface of the insulating layer.
The display substrate according to claim 2 or 3, wherein a surface of a portion of the insulating layer corresponding to the transfer portion is a surface having protrusions and depressions.
The display substrate according to claim 4, wherein the surface having the protrusions and the depressions is a curved surface.
The display substrate according to any one of claims 2 to 5, wherein a second electrode corresponding to the light emitting unit is further provided on an upper surface of the insulating layer, and the light emitting unit is disposed in a corresponding On the upper surface of the two electrodes.
The display substrate according to claim 6, wherein the second electrode and the signal line are made of the same material.
The display substrate according to claim 6 or 7, wherein the second electrode and the signal line are disposed in the same layer.
The display substrate according to any one of claims 2-8, wherein the display substrate further comprises a pixel defining layer disposed over the insulating layer, the pixel defining layer being located in the display area.
The display substrate according to claim 9, wherein a plurality of openings penetrating through the pixel defining layer are disposed in the pixel defining layer, the openings are in one-to-one correspondence with the light emitting unit, and the light emitting unit is disposed in a corresponding In the opening.
The display substrate according to any one of claims 1 to 10, wherein the signal line is made of a metal material.
The display substrate according to any one of claims 1 to 11, wherein the signal line is a low level signal line.
A display device comprising the display substrate according to any one of claims 1 to 12.
The display device according to claim 13, wherein said display device further comprises a cover plate disposed opposite said display substrate.
The display device according to claim 14, wherein a sealant is disposed between the display substrate and the cover, the sealant is located in the non-display area, and the signal line is located in the display area. Between the sealant and the sealant.
The display device according to any one of claims 13 to 15, wherein the display device is a mobile phone, a display, a tablet, an electronic paper or an electronic photo frame.