CN108172694B

CN108172694B - Display panel and display device

Info

Publication number: CN108172694B
Application number: CN201711396949.8A
Authority: CN
Inventors: 于子洋; 李玉解; 马中生
Original assignee: Kunshan Visionox Technology Co Ltd
Current assignee: Suzhou Qingyue Optoelectronics Technology Co Ltd
Priority date: 2017-12-21
Filing date: 2017-12-21
Publication date: 2020-01-14
Anticipated expiration: 2037-12-21
Also published as: CN108172694A

Abstract

The application relates to the technical field of display, in particular to a display panel and a display device, which are used for solving the problem that a display picture of the display panel is yellow under low power consumption in the prior art. The display panel comprises a first electrode, a second electrode and a light-emitting layer, wherein a conductive filter layer is arranged in the first electrode on one side of a light-emitting surface of the light-emitting layer, and the blue light transmittance of the conductive filter layer is greater than the yellow light transmittance. This application sets up the electrically conductive filter layer in the first electrode that display panel light-emitting direction corresponds, because the blue light transmissivity of this electrically conductive filter layer is greater than yellow light transmissivity for light is when the first electrode of process, and the blue light that sees through is more than the yellow light, makes the colour via this electrically conductive filter layer's emergent light more balanced. The proportion of blue light and yellow light in the light emitted by the first electrode is closer to the balance of color harmony, the integral display color tone of the display panel is balanced, and the problem of yellow picture caused by large proportion of yellow light in the prior art is solved.

Description

Display panel and display device

Technical Field

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

Background

As shown in fig. 1, a conventional electroluminescent display panel often includes an anode 11, a cathode 13, and a light-emitting layer 12. The light emitting layer 12 is sandwiched between the anode 11 and the cathode 13, and the light emitting layer 12 may include a red pixel, a green pixel, and a blue pixel. The anode 11 supplies holes to the light emitting layer 12, the cathode 13 supplies electrons to the light emitting layer, and the light emitting layer 12 emits light during recombination of the electrons and the holes.

In the prior art, the electroluminescent display panel is usually required to be started at a higher voltage, and when a higher voltage difference exists between the anode 11 and the cathode 13, the display screen of the display panel is balanced in color tone without color cast. However, in the conventional display panel, at a lower voltage, the light emitted by the blue pixel is weaker than that emitted by the red pixel and that emitted by the green pixel, and the display screen tends to be yellowish, so that the overall color tone of the display panel is yellowish, and the display effect is not good.

Disclosure of Invention

The application provides a display panel and a display device, which are used for solving the problem that a display picture of the display panel is yellow under lower power consumption in the prior art.

The following technical scheme is adopted in the application:

a display panel comprises a first electrode, a second electrode and a light emitting layer clamped between the first electrode and the second electrode, wherein a conductive filter layer is arranged in the first electrode on one side of a light emitting surface of the light emitting layer, and the blue light transmittance of the conductive filter layer is greater than the yellow light transmittance.

Preferably, the light emitting layer has a stacked structure including at least two pixel layers.

Preferably, the display panel further includes: and the connecting electrode is arranged between adjacent pixel layers of the light-emitting layer, and a conductive filter layer is arranged in the connecting electrode.

Preferably, the light emitting layer includes two pixel layers, wherein a green pixel is disposed in a pixel layer adjacent to the second electrode.

Preferably, the light emitting layer includes three pixel layers; wherein the green pixel is disposed in a pixel layer adjacent to the second electrode, or the green pixel is disposed in a pixel layer located in the middle of the stacked structure.

Preferably, a light reflecting layer is arranged on one surface of the second electrode far away from the light emitting layer; wherein a conductive filter layer is arranged in the second electrode.

Preferably, the electrode provided with the conductive filter layer is of at least three-layer laminated structure, and the conductive filter layer is clamped between any adjacent film layers.

Preferably, the electrode provided with the conductive filter layer is of a two-layer laminated structure, and the conductive filter layer is arranged on any surface of the film layer.

Preferably, the conductive filter layer is made of organic matter, metal or metal oxide.

Preferably, the conductive filter layer is a metal oxide, and the thickness of the conductive filter layer is in a range of 2 micrometers to 5 micrometers.

A display device comprises any one of the display panels.

The technical scheme of this application can reach following beneficial effect:

this application sets up the electrically conductive filter layer in the first electrode that display panel light-emitting direction corresponds, because the blue light transmissivity of electrically conductive filter layer is greater than the yellow light transmissivity for light is when the first electrode, and the yellow light that is filtered is more than the blue light, in other words, and the blue light that sees through is more than the yellow light, makes the colour of the emergent light via this electrically conductive filter layer more balanced. Therefore, the proportion of blue light and yellow light in the light emitted by the first electrode is closer to the balance of color harmony, the integral display color tone of the display panel is balanced, and the problem that the picture is yellow due to the large proportion of yellow light in the prior art is solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a diagram illustrating a film structure of a display panel according to the prior art;

FIG. 2 is a schematic diagram of a film structure of a display panel according to the present invention;

FIG. 3 is a second schematic view of a film structure of a display panel according to the present invention;

FIG. 4a is a schematic diagram of a structure of a display panel with a double-layered structure according to the present invention;

FIG. 4b is a second schematic view of a film structure of a display panel with a double-layer stacked structure according to the present invention;

FIG. 5a is a schematic diagram of a three-layer structure of a display panel according to the present invention;

FIG. 5b is a second schematic view of a film structure of a display panel with a three-layer stacked structure according to the present invention;

FIG. 6 is a schematic diagram of a structure of a display panel with a reflective layer according to the present invention;

fig. 7a is one of the film layer structure diagrams of the electrode where the conductive filter layer is located according to the present embodiment;

fig. 7b is a second schematic view of the film structure of the electrode having the conductive filter layer according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, 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 application.

The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings. The display panel provided by the application can be applied to various electronic equipment with a display function, and is mainly used for realizing the display output function of the electronic equipment.

Example one

The embodiment of the present application provides a display panel, as shown in fig. 2, a light emitting direction of the display panel is shown by an arrow in the figure, the display panel includes a first electrode 21, a second electrode 23, and a light emitting layer 22 sandwiched between the first electrode 21 and the second electrode 23, a conductive filter layer a is disposed in the first electrode 21 on a light emitting surface side of the light emitting layer 22, wherein a blue light transmittance of the conductive filter layer a is greater than a yellow light transmittance.

In this embodiment, the first electrode 21 is an anode and the second electrode 23 is a cathode, and it should be understood that the anode and the cathode can be interchanged according to the actual production requirement, i.e. the first electrode 21 is a cathode and the second electrode 23 is an anode. In addition, the conventional display panel often emits light from one surface, and the light emitting surface of the light emitting layer can be understood as the light emitting surface of the display panel, and the display panel can have the following two structures:

the structure I is as follows:

as shown in fig. 2, the first electrode corresponding to the light emitting surface side of the light emitting layer 22 in the above structure is the anode 21. A conductive filter layer a having a blue light transmittance larger than a yellow light transmittance is provided in the anode 21. When the light emitting layer 22 in the structure emits light, the light enters the anode 21 from the light emitting layer 22, and based on the above-mentioned filtering characteristics of the conductive filter layer a, the conductive filter layer a in the anode 21 can filter yellow light in the light to absorb the yellow light in the light, and at the same time, it is ensured that the passing blue light is not affected as much as possible, that is, the light transmittance of the blue light in the conductive filter layer a is greater than that of the yellow light. The brightness of yellow light emitted by the light-emitting layer 22 is reduced by the conductive filter layer a, so that the overall color tone of the light emitted by the anode 21 is balanced, and the overall yellow color of the display screen of the display panel is relieved.

The structure II is as follows:

as shown in fig. 2, the first electrode 21 corresponding to the light emitting direction of the light emitting layer 22 in the above structure is a cathode. A conductive filter layer a having a blue light transmittance greater than a yellow light transmittance is provided in the cathode 21. When the light-emitting layer 22 in the structure emits light, the light enters the cathode 21 from the light-emitting layer 22, and the conductive filter layer a in the cathode 21 can filter yellow light in the light, so that the overall color tone of the light emitted by the cathode 21 is balanced, and the overall yellow display frame of the display panel is relieved.

Through above technical scheme, this application is provided with the electrically conductive filter layer in the first electrode of luminescent layer play plain noodles one side, because the blue light transmissivity of electrically conductive filter layer is greater than the yellow light transmissivity for light is when passing through first electrode, and the yellow light that is filtered is more than the blue light, in other words, the blue light that sees through is more than the yellow light. Therefore, the proportion of blue light and yellow light in the light emitted by the first electrode is closer to the balance of color harmony, and the problem of yellow picture caused by larger proportion of yellow light in the prior art is solved. In addition, the conductive filter layer has conductivity, and can reduce the resistance of the electrode on one side of the light-emitting surface of the light-emitting layer, thereby improving the voltage of the polar plate to a certain extent, enhancing the voltage difference between the polar plates on two sides of the light-emitting layer, and improving the overall brightness of the screen body.

In the display panel related to the present application, the conductive filter layer may be an organic material, a metal, or a metal oxide, and when the conductive filter layer is a metal oxide, the thickness of the conductive filter layer is greater than or equal to 2 micrometers and less than or equal to 5 micrometers.

Example two

Based on the foregoing embodiments, the present application further provides a display panel, where the light emitting layer in the display panel is a stacked structure including at least two pixel layers; in addition, the light-emitting device further comprises a connecting electrode arranged between adjacent pixel layers of the light-emitting layer, wherein a conductive filter layer is arranged in the connecting electrode. As shown in fig. 3, a light emitting layer 22 is sandwiched between the first electrode 21 and the second electrode 23, the light emitting layer 22 includes a stacked structure of two pixel layers, the first pixel layer 221 is close to the first electrode 21, the second pixel layer 222 is close to the second electrode 23, a connection electrode 24 is further sandwiched between the first pixel layer 221 and the second pixel layer 222, a conductive filter layer 21a is disposed in the first electrode 21, and a conductive filter layer 24a is disposed in the connection electrode 24.

The conductive filter layer 24a is arranged in the connection electrode 24, and the blue light transmittance of the conductive filter layer 24a is greater than the yellow light transmittance, so that yellow light in light emitted by the light-emitting layer 22 can be further filtered, the yellow light intensity in the light passing through the connection electrode 24 is reduced, the transmitted blue light is more than yellow light, the integral display hue of the display panel is balanced, and the yellow phenomenon of the display picture of the display panel under low power consumption is relieved. In addition, since the conductive filter layer 24a has conductivity, the resistance of the connection electrode 24 can be reduced to some extent, and the light emission efficiency of the entire light-emitting layer 22 can be improved.

Based on the structure of the display panel, the light emitting layer includes two pixel layers, wherein a green pixel is disposed in the pixel layer adjacent to the second electrode. In the following, in the drawings of this embodiment, R represents a red pixel, G represents a green pixel, and B represents a blue pixel, the display panel in this embodiment may have the following structure:

structure a:

fig. 4a is a schematic diagram of a film structure of a display panel, in which a light emitting layer 22 is sandwiched between a first electrode 21 and a second electrode 23, the light emitting layer 22 includes a first pixel layer 221 close to the first electrode 21 and a second pixel layer 222 close to the second electrode 23, and a conductive filter layer 21a is disposed in the first electrode 21.

The second pixel layer 222 in the light emitting layer 22 includes green pixels, the first pixel layer 221 is a composite pixel layer including red pixels and blue pixels, a connection electrode 24 is further interposed between the first pixel layer 221 and the second pixel layer 222, a conductive filter layer may be disposed in the connection electrode 24, and the red pixels and the blue pixels in the first pixel layer 221 are alternately disposed. In the structure, the actual position of each color pixel on the corresponding film layer can be adjusted according to the actual production requirement, the number of different color pixels can be the same or different, and the positions of different film layer pixels can be mutually corresponding or staggered.

Structure b:

as shown in fig. 4b, the first electrode 21 and the second electrode 23 sandwich a light emitting layer 22, the light emitting layer 22 includes a first pixel layer 221 adjacent to the first electrode 21 and a second pixel layer 222 adjacent to the second electrode 23, and the conductive filter layer 21a is disposed in the first electrode 21.

The second pixel layer 222 in the light emitting layer 22 may have a composite structure, specifically, a composite structure of a green pixel and a red pixel, and the first pixel layer 221 includes a blue pixel. In addition, the positions of the red and blue pixels in fig. 4b may be interchanged. A connection electrode 24 is further interposed between the first pixel layer 221 and the second pixel layer 222, and a conductive filter layer may be provided in the connection electrode 24.

With the structure of the light emitting layer 22 shown in fig. 4a and 4b, the display panel can realize multicolor screen display based on the structure of any of the light emitting layers 22 described above. The conductive filter layer provided in the connection electrode 24 is not shown in the figure, and the blue light transmittance of the conductive filter layer is greater than the yellow light transmittance, and based on the filtering characteristic, the conductive filter layer can further filter the yellow light passing through the connection electrode 24, so that the ratio of the blue light to the yellow light in the light emitted from the connection electrode 24 is ensured to be closer to the balance of color harmony, the color tone of the display picture is balanced, and the problem of yellow display picture under low power consumption is solved.

Similar to the light emitting layer structure, the embodiment of the present application further provides another light emitting layer structure, in the display panel structure, the light emitting layer includes three pixel layers; wherein the green pixel is disposed in a pixel layer adjacent to the second electrode, or the green pixel is disposed in a pixel layer located in the middle of the stacked structure.

As shown in fig. 5a, in the display panel structure, a light emitting layer 22 is sandwiched between a first electrode 21 and a second electrode 23, the light emitting layer 22 includes a first pixel layer 221 close to the first electrode 21 and a third pixel layer 223 close to the second electrode 23, a second pixel layer 222 is further sandwiched between the first pixel layer 221 and the third pixel layer 223, a first connection electrode 241 and a second connection electrode 242 are further disposed between different pixel layers, and a conductive filter layer 21a is disposed in the first electrode 21. In the light emitting layer 22, the green pixels are disposed in the third pixel layer 223 close to the second electrode, and the red pixels and the blue pixels are disposed in the second pixel layer 222 and the first pixel layer 221, respectively, and specifically, the positions of the blue pixels and the red pixels can be adjusted according to actual production requirements, that is, the blue pixels can be located in the second pixel layer 222, and the red pixels can be located in the first pixel layer 221. A first connecting electrode 241 and a second connecting electrode 242 are further respectively interposed between different pixel layers, and at least one of the two connecting electrodes is provided with a conductive filter layer, wherein the light transmittance of the blue light of the conductive filter layer is greater than that of the yellow light, and based on the characteristics, the conductive filter layer can filter the yellow light emitted from the third pixel layer 223. Preferably, the first connecting electrode 241 and the second connecting electrode 242 may be provided with conductive filter layers, light emitted from the third pixel layer 223 passes through the conductive filter layer in the second connecting electrode 242 to filter yellow light for one time, and passes through the conductive filter layer in the first connecting electrode 241 to filter yellow light for the second time, and after filtering for two times, brightness of yellow light emitted from the third pixel layer 223 can be effectively reduced, so that light hue emitted from the light emitting layer 22 is balanced, and the display panel is relieved from displaying yellow under low voltage.

As shown in fig. 5b, in the display panel, the first electrode 21 and the second electrode 23 may be provided with a light emitting layer 22, the light emitting layer 22 includes a first pixel layer 221 adjacent to the first electrode 21 and a third pixel layer 223 adjacent to the second electrode 23, the second pixel layer 222 is further provided between the first pixel layer 221 and the third pixel layer 223, the first connection electrode 241 and the second connection electrode 242 are further provided between different pixel layers, and the first electrode 21 is provided with the conductive filter layer 21 a. The green pixels are arranged in the second pixel layer 222 located in the middle of the laminated structure, and the red pixels and the blue pixels are respectively located in the first pixel layer 221 and the third pixel layer 223, and the positions of the blue pixels and the red pixels can be interchanged according to actual production requirements. In this structure, the first connecting electrode 241 may be provided with a conductive filter layer, and light emitted from the second pixel layer 222 is filtered by the conductive filter layer in the first connecting electrode 241, so that the yellow light intensity can be reduced, the brightness of yellow light emitted from the light-emitting layer 22 can be reduced, the overall display color tone of the display panel can be balanced, and the yellow display image can be reduced with low power consumption.

In addition, the light emitting layer having the composite pixel layer shown in fig. 4a and 4b has a thinner thickness and a higher integration degree than the three-layer monochrome pixel layer stacked structure shown in fig. 5a and 5 b. Meanwhile, the display device has a good multi-color picture display function. Based on the filtering characteristic of the conductive filtering layer in the display panel, the transmitted blue light can be more than yellow light, the structure can relieve the situation that the picture is yellow under low power consumption, the displayed tone is balanced, and the better color display effect is ensured.

Based on the display panel structure, a reflective layer is arranged on one surface, far away from the luminescent layer, of the second electrode; wherein a conductive filter layer is arranged in the second electrode. As shown in fig. 6, the light emitting direction of the light emitting layer 22 will be described in detail below with the first electrode 21 as an anode and the second electrode 23 as a cathode. In this display panel, a light reflecting layer 25 is provided on the surface of the cathode 23 remote from the light emitting layer 22, and a conductive filter layer 23a is provided in the second electrode 23.

In the actual operation of the display panel, the light-emitting layer 22 emits light in the circumferential direction, and emits light in the direction of the anode 21 and in the direction of the cathode 23, and in the light-emitting layer 22 shown in the figure, light emitted in the direction of the cathode 23 is often absorbed by an opaque film layer such as a substrate. In the scheme, the reflective layer 25 on the surface of the cathode 23 far away from the light-emitting layer 22 can reflect the light emitted from the light-emitting layer 22 to the cathode 23, so that the light intensity via the anode 21 is enhanced to a certain extent, and the overall brightness of the display panel is improved under low power consumption. Moreover, the light reflected by the reflective layer 25 is filtered by the conductive filter layer 23a, so that the yellow light intensity can be reduced, the light emitted by the light-emitting layer 22 towards the anode 21 and the light reflected by the reflective layer 25 and filtered by the conductive filter layer 23a pass through the conductive filter layer 21a in the anode 21 together, and based on the filtering characteristics of the conductive filter layer 21a, the transmitted blue light is more than the yellow light, so that the brightness of the yellow light in the emergent light is reduced with low power consumption, the integral display tone of the display panel is balanced, and the yellow phenomenon of the display screen body is relieved.

Based on the structure of the display panel, the following two structures may specifically exist for the electrode where the conductive filter layer is located:

electrode structure a:

the electrode provided with the conductive filter layer is of at least three-layer laminated structure, and the conductive filter layer is clamped between any adjacent film layers. The film layer may be made of a conductive material with good light transmittance, specifically Indium Tin Oxide (ITO). Fig. 7a is one of the film layer structures of the electrode 71 where the conductive filter layer 71a is located, the electrode 71 where the conductive filter layer 71a is located has a three-layer laminated structure, and the electrode 71 may be a cathode or an anode, or may be a connection electrode. In this structure, since the conductive filter layer 71a is made of a conductive material and is sandwiched between the electrodes 71, the resistance of the electrodes 71 can be reduced, thereby increasing the plate voltage of the electrodes corresponding to the light emitting direction to a certain extent, improving the light emitting efficiency, and improving the overall brightness of the panel. Similarly, the electrode provided with the conductive filter layer may have a multilayer laminated structure, and a plurality of conductive filter layers may be provided in the electrode, and a plurality of conductive filter layers may be laminated in the electrode to filter light passing through the electrode a plurality of times. For example, two conductive filter layers are disposed in an electrode, and the electrode has a "three plus two" electrode structure, and when light passes through the electrode, the light is first filtered through the first conductive filter layer, and then filtered through the second conductive filter layer for the second time. For the electrode structure, emergent light passing through the electrode is filtered twice, so that the yellow light brightness is further reduced, the emergent light tone is balanced, and the display effect is optimized.

Electrode structure b:

the electrode provided with the conductive filter layer is of a two-layer laminated structure, and the conductive filter layer is arranged on any surface of the film layer. The film layer may be made of a conductive material with good light transmittance, specifically Indium Tin Oxide (ITO). Fig. 7b is a second schematic diagram of a film layer structure of an electrode having a conductive filter layer, the electrode 71 having the conductive filter layer 71a has an overlapping structure, and the conductive filter layer 71a and the electrode 71 having the conductive filter layer 71a are overlapped. The electrode 71 may be a cathode or an anode, or may be a connection electrode. Under the structure, the light transmittance of the blue light of the conductive filter layer is greater than that of the yellow light, and based on the characteristic, the conductive filter layer can filter the yellow light passing through the electrode so as to reduce the brightness of the yellow light of a display picture and balance the overall display tone of the display panel, thereby relieving the yellowing phenomenon of the display picture screen. Since the conductive filter layer 71a is made of a conductive material, the overall brightness of the screen can be improved to some extent. In addition, in the aspect of production technology, the structure b only needs to be provided with a two-layer film structure, so that the production flow is simpler, and the production cost is saved. It should be noted that, for fig. 7a and 7b, only the film layer structure of the electrode where the conductive filter layer is located is shown, and the thickness relationship between the specific electrode and the conductive filter layer can be adjusted according to actual production requirements.

EXAMPLE III

Based on the foregoing embodiments, an embodiment of the present application further provides a display device, which includes any one of the display panels in the foregoing embodiments. The display device can be any product or component with a display function, such as a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator, intelligent wearable equipment and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the present application.

The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A display panel comprising a first electrode, a second electrode, and a light-emitting layer interposed between the first electrode and the second electrode,

a conductive filter layer is arranged in the first electrode on one side of the light emitting surface of the light emitting layer, wherein the blue light transmittance of the conductive filter layer is greater than the yellow light transmittance;

the light emitting layer is a laminated structure at least comprising two pixel layers, wherein a blue pixel is arranged in the pixel layer close to the first electrode;

the display panel further comprises a connecting electrode arranged between adjacent pixel layers of the light-emitting layer, wherein a conductive filter layer is arranged in the connecting electrode.

2. The display panel according to claim 1, wherein the light emitting layer includes two pixel layers, wherein a green pixel is provided in a pixel layer adjacent to the second electrode.

3. The display panel according to claim 1, wherein the light emitting layer includes three pixel layers; wherein the green pixel is disposed in a pixel layer adjacent to the second electrode, or the green pixel is disposed in a pixel layer located in the middle of the stacked structure.

4. The display panel according to claim 1, wherein a surface of the second electrode which is located away from the light-emitting layer is provided with a light-reflecting layer; wherein a conductive filter layer is arranged in the second electrode.

5. The display panel according to any one of claims 1 to 4, wherein the electrode provided with the conductive filter layer is of at least a three-layer laminated structure, and the conductive filter layer is sandwiched between any adjacent film layers.

6. The display panel according to any one of claims 1 to 4, wherein the electrode provided with the conductive filter layer is a two-layer laminated structure, and the conductive filter layer is provided on either surface of a film layer.

7. The display panel of claim 1, wherein the conductive filter layer is made of an organic material, a metal or a metal oxide.

8. The display panel of claim 7, wherein the conductive filter layer is a metal oxide and the conductive filter layer has a thickness in a range from 2 microns to 5 microns.

9. A display device characterized by comprising the display panel according to any one of claims 1 to 8.