CN110880528A

CN110880528A - OLED display panel and display device

Info

Publication number: CN110880528A
Application number: CN201911294951.3A
Authority: CN
Inventors: 夏曾强; 赵恒涛; 余兆伟
Original assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Priority date: 2019-12-16
Filing date: 2019-12-16
Publication date: 2020-03-13
Anticipated expiration: 2039-12-16
Also published as: CN110880528B

Abstract

The application relates to the technical field of display, and discloses an OLED display panel and display device, OLED display panel includes: a substrate base plate; the pixel defining layer is formed on the substrate and provided with concave parts which correspond to the pixel units one by one, each concave part is provided with a bottom surface and a side surface, and an included angle formed between the side surfaces and the bottom surface is an obtuse angle; and the light-emitting functional layers are formed in the concave parts and correspond to the pixel units one by one, and in each pair of the light-emitting functional layers and the concave parts, the light-emitting functional layers cover the bottom surfaces of the concave parts and at least part of the side surfaces of the concave parts. The OLED display panel can improve poor display related to a visual angle so as to enhance the display effect.

Description

OLED display panel and display device

Technical Field

The application relates to the technical field of display, in particular to an OLED display panel and a display device.

Background

As OLED products mature in technology and expand in market, more and more products adopt OLED display technology, wherein the advantage of OLED display technology mainly lies in its flexible characteristic. However, due to the characteristics of the OLED product, as shown in fig. 1, in the microcavity structure of the conventional OLED display panel, only the bottom surface of the microcavity is subjected to evaporation of the light-emitting material, and the light emitted therefrom has strong directivity, so that the OLED display panel has different display effects in different directions, including color parameters such as brightness and chromaticity.

The white light displayed by the OLED is composite light synthesized by three colors of R/G/B according to a certain proportion, and when the brightness and color coordinates of one or more colors deviate from the original set proportion, the color deviation occurs, and color difference is generated visually. For example, when the brightness of blue is attenuated while the brightness of red and green is unchanged in white light, the blended color will show a yellowish color. Therefore, this results in that in the case of displaying in a larger viewing angle direction or a larger angle, the color of the screen may deviate to different degrees, exhibiting a red, green, yellow, or the like state.

Disclosure of Invention

The invention provides an OLED display panel, which can emit light in a specific direction to make up for the phenomenon of attenuation of different angles of an OLED device due to a microcavity, so that poor display related to a visual angle is improved, and the display effect is enhanced.

In order to achieve the above object, the present application provides an OLED display panel including:

a substrate base plate;

the pixel defining layer is formed on the substrate and provided with concave parts which correspond to the pixel units one by one, each concave part is provided with a bottom surface and a side surface, and an included angle formed between each side surface and the bottom surface is an obtuse angle;

and the light-emitting functional layers are formed in the concave parts and correspond to the pixel units one by one, and each pair of the light-emitting functional layers and the concave parts cover the bottom surfaces of the concave parts and at least part of the side surfaces of the concave parts.

According to the OLED display panel, the pixel defining layer is provided with the plurality of concave parts in one-to-one correspondence with the pixel units, the angle formed between the bottom surface and the side surface of each concave part is an obtuse angle, and the light-emitting function layers are deposited on the bottom surface of each concave part and at least one part of the side surface of each concave part, so that the light-emitting function layers arranged on the side surfaces of the concave parts can normally emit light while the light-emitting function layers on the bottom surface of each concave part normally emit light, an array with light emitted at a certain angle is formed, and the phenomenon that the OLED panel is attenuated at different angles due to the micro-cavities is made up.

Therefore, according to the OLED display panel, the light emitting function layers are formed on the bottom surface and the side surface of each concave portion, so that strong light can be emitted in the direction of the side surface, the phenomenon that OLED devices are attenuated at different angles due to the micro-cavities is made up, poor display related to a visual angle is improved, and the display effect is enhanced.

Preferably, the light-emitting functional layer on the side surface of each recess extends to the surface of the pixel defining layer at the periphery thereof facing away from the base substrate.

Preferably, the light emitting function layer includes an anode layer and an organic light emitting layer.

Preferably, the edge region of the substrate base plate is in a bent state, and the larger the bending angle of the edge region is, the smaller the included angle formed between the bottom surface and the side surface of the recess portion located in the edge region is.

Preferably, in the plurality of recesses in the edge region, in a direction from the connecting end to the free end of the edge region, a height of a side of each recess away from the free end is smaller than a height of a side thereof close to the free end.

Preferably, an angle formed between a bottom surface and a side surface of each recess portion located in a non-edge region of the substrate base plate is 130 ° to 145 °.

Preferably, the height of the pixel defining layer is 1.5 um.

Preferably, the present application also provides a display device comprising the OLED display panel described above.

Drawings

FIG. 1 is a schematic cross-sectional view of an OLED display panel in the prior art;

FIG. 2 is a cross-sectional view of an OLED display panel according to the present application;

FIG. 3 is a schematic diagram of light emission from an OLED display panel according to the present application;

FIG. 4 is a schematic diagram of light emission from an OLED display panel in the prior art;

FIG. 5 is a schematic diagram of light emission from an OLED display panel according to the present application;

fig. 6 is a schematic partial structure diagram of an edge region of an OLED display panel according to the present application.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, in the conventional OLED display panel, a pixel defining layer 02 has recesses corresponding to pixel units one by one to form a microcavity, and a bottom surface of the microcavity has a light-emitting functional layer 03, and a light-emitting direction of the light-emitting functional layer is referred to an arrow direction in the figure. As can be seen from fig. 1, the light-emitting direction of each microcavity of the OLED display panel is relatively concentrated in the direction perpendicular to the substrate 01, which may cause the light-emitting attenuation condition under the change of the viewing angle, and thus cause the display failure.

Based on the above situation, referring to fig. 2, the present invention provides an OLED display panel, including: a base substrate 1; a pixel defining layer 2 formed on the substrate 1, the pixel defining layer 2 having a plurality of recessed portions 3 corresponding to the plurality of pixel units one by one, wherein each recessed portion 3 has a bottom surface and a side surface, and an included angle formed between the side surface and the bottom surface is an obtuse angle; and the light-emitting functional layers 4 are formed in the concave parts 3 and correspond to the pixel units one by one, and in each pair of the light-emitting functional layers 4 and the concave parts 3, the light-emitting functional layers 4 cover the bottom surfaces of the concave parts 3 and at least part of the side surfaces of the concave parts 3.

In the OLED display panel in this application, pixel definition layer 2 has a plurality of depressed parts 3 with pixel unit one-to-one, all is formed with luminous functional layer 4 on the bottom surface of depressed part 3 and the side, and luminous functional layer 4 on the bottom surface also can normally go out light in specific direction at luminous functional layer 4 that lies in the side under the circumstances of normal light-emitting, and is certain angle between luminous functional layer 4's of side light-emitting direction and substrate base plate 1. Referring to fig. 3, solid arrows indicate the light emitting direction of the light emitting functional layer 4 on the bottom surface, and dashed arrows indicate the light emitting direction of the light emitting functional layer 4 on the side surface, wherein the length of the lines represents the intensity of the emitted light. As can be seen from fig. 3, the light emitted from the light-emitting functional layer 4 on the bottom surface is relatively concentrated in the direction perpendicular to or close to the perpendicular direction to the substrate 1, and the light emitted from the light-emitting functional layer 4 on the side surface is relatively concentrated in the direction perpendicular to or close to the perpendicular direction to the side surface, and the included angle between the side surface and the bottom surface is an obtuse angle, so that the light emitted from the light-emitting functional layer 4 on the side surface can compensate for the attenuation phenomenon caused by the light emitted from the light-emitting functional layer 4 on the bottom surface at different angles, and the light emitted from each light-emitting direction of each concave portion 3 is.

It should be noted that the size of the included angle between the bottom surface and the side surface of the concave portion 3 can be designed correspondingly according to different product characteristics.

Therefore, according to the OLED display panel, the light emitting function layers 4 are formed on the bottom surface and the side surface of the concave portion 3, so that the light emitting function layers 4 of each part form an array with light emitting at a certain angle, and strong light emitting is realized in a specific direction, so that poor display related to a visual angle is improved, and the display effect is enhanced.

The light-emitting functional layer 4 may include an anode layer 41 and an organic light-emitting layer 42, and further, in the OLED display panel, the light-emitting functional layer 4 on the side surface extends to the surface of the pixel defining layer 2 around the recessed portion 3, so that more light-emitting materials can be evaporated to the side surface of the recessed portion 3, and the area of the light-emitting functional layer 4 on the side surface is increased as much as possible, thereby effectively compensating for the phenomenon of different angle attenuations caused by the microcavity effect, and the structure is also convenient for manufacturing products.

In one embodiment, most of the existing OLED products have curved edges, in which case the edge region 11 of the substrate base plate 1 will be curved, which may result in the color shift attenuation of the viewing angle. At larger viewing angles, the normal color shift direction also changes and the brightness also decays. Therefore, the included angle between the side surface and the bottom surface of the concave portion 3 in the edge region 11 is changed, so that the color mixture ratio is restored to balance, and when the bending angle of the edge region 11 is larger, the included angle formed between the bottom surface and the side surface of the concave portion 3 located in the edge region 11 is smaller.

Reference may be made to fig. 4 and 5, in which solid line arrows are light emitting directions of the light emitting functional layer 4 on the bottom surface, dashed line arrows are light emitting directions of the light emitting functional layer 4 on the side surface, wherein the length of a line represents the intensity of the emitted light, and a dashed frame represents a range of the light received at the front viewing angle. When the bending angle of the edge region 11 of the OLED product is 60 °, the included angle between the bottom surface and the side surface of each recess 3 in the edge region 11 may be set to be 120 ° to 150 °, and the height of the pixel defining layer 2 is maintained, and evaporation of the light emitting material is performed. Because the light-emitting of the side light-emitting functional layer 4 is enhanced in the positive visual angle and is mixed with the original light source, a complementary effect is formed on the original light source, so that the light-emitting in the positive visual angle is enhanced, and the parallax is reduced.

Further, when the bending angle of the edge region 11 is too large, for example, more than 60 °, among the plurality of concave portions 3 located in the edge region 11, in the direction from the connecting end to the free end of the edge region 11, the height of the side of each concave portion 3 away from the free end is smaller than the height of the side thereof close to the free end. That is, referring to fig. 6, the pixel defining layer 2 between every two adjacent recesses 3 is in a slope shape, and due to an excessively large bending angle, the light emitting direction at the slope of the pixel defining layer 2 is blocked by the pixel defining layer 2 in the non-edge region, so that it is difficult to emit light perpendicular to the non-edge region. The heights of the slopes of the pixel defining layers 2 in the edge region 11 are sequentially increased, so that the light emission perpendicular to the non-edge region is enhanced, the problem of poor display is solved, and the display effect is enhanced.

It should be noted that, the size of the included angle between the bottom surface and the side surface of the recess 3 in the edge region 11 and the height of the slope of the pixel defining layer 2 need to be designed accordingly according to different product characteristics.

In one embodiment, the color shift of the plurality of recesses 3 in the non-edge region also varies with the viewing angle due to the microcavity effect of the OLED device, i.e., a large color shift value occurs at a specific angle, and generally, a large color shift value occurs at a viewing angle between 30 ° and 50 °. Therefore, the included angle between the bottom surface and the side surface of each recess 3 in the non-edge region can be controlled to be between 130 ° and 145 °, and the height of the pixel defining layer 2 can also be selected to be 1.5um, so that the OLED display panel in the present application has optical compensation in a specific direction, thereby improving the display effect.

In general, since the three colors are attenuated differently, the luminance of blue is attenuated relatively quickly, and the color shift is greatly affected, it is preferable to process the blue pixels, so that the viewing angle color shift can be maximally improved while simplifying the process.

Furthermore, the present invention can also provide a display device, including the OLED display panel, since the display panel can improve the display defects related to the viewing angle, and can also change the display effect of the curved edge region 11, the display effect of the display device can be ensured.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. An OLED display panel, comprising:

a substrate base plate;

2. The OLED display panel according to claim 1, wherein the light emitting functional layer on the side of each of the recesses extends to a surface of the pixel defining layer at the periphery thereof facing away from the substrate base plate.

3. The OLED display panel of claim 2, wherein the light emitting functional layer comprises an anode layer and an organic light emitting layer.

4. The OLED display panel according to claim 1, wherein the edge region of the substrate is bent, and the larger the bending angle of the edge region is, the smaller the included angle formed between the bottom surface and the side surface of the recess portion in the edge region is.

5. The OLED display panel of claim 4, wherein the plurality of recesses in the edge region each have a side edge that is farther from the free end that is less in height than a side edge that is closer to the free end in a direction from the connected end to the free end of the edge region.

6. The OLED display panel of claim 1, wherein an angle formed between a bottom surface and a side surface of each recess in the non-edge region of the substrate base plate is 130 ° -145 °.

7. The OLED display panel of claim 6, wherein the pixel defining layer has a height of 1.5 um.

8. A display device comprising the OLED display panel according to any one of claims 1 to 7.