CN107978618A - A kind of display panel, display device and display panel production method - Google Patents

Abstract

The embodiment of the invention discloses a display panel, a display device and a manufacturing method of the display panel. The display panel includes: a substrate; a plurality of first electrodes and a pixel definition layer arranged on the substrate, the pixel definition layer and the plurality of first electrodes do not alternately overlap each other on the substrate; an insulating barrier strip arranged on the pixel definition layer ; The first hole injection layer arranged on the pixel definition layer and the first electrode; the insulating barrier strip divides the first hole injection layer into a plurality of sub-hole injection layers, and the plurality of sub-hole injection layers and a plurality of first electrodes one-to-one correspondence; and the organic light-emitting layer and the second electrode that are sequentially arranged on the first hole injection layer, wherein the organic light-emitting layer has a plurality of sub-light-emitting layers that emit light of different colors, and the plurality of sub-light-emitting layers and the plurality of sub-holes Injection layers correspond one-to-one. The embodiment of the present invention solves the problem of color shift caused by leakage current between pixel units of different colors when the gray scale is low.

Description

A display panel, a display device, and a method for manufacturing a display panel

technical field

Embodiments of the present invention relate to organic light-emitting display technologies, and in particular, to a display panel, a display device, and a method for manufacturing a display panel.

Background technique

With the development of organic light emitting display technology, the display effect of organic light emitting display products is continuously improved, so that the application of organic light emitting display products becomes more and more extensive.

At present, the hole injection layer of the organic light-emitting display panel is formed by evaporation process to form a whole layer of film. At low grayscale, there is an exaggeration between the pixel units of different colors. When the exaggeration reaches a certain value, the pixel units of different colors Leakage current will be generated between the pixel units through the hole injection layer, causing color shift at low gray scale.

Contents of the invention

The invention provides a display panel, a display device and a manufacturing method of the display panel to solve the problem of color shift caused by leakage current between pixel units of different colors at low gray scale.

In a first aspect, an embodiment of the present invention provides a display panel, and the display panel includes:

Substrate;

A plurality of first electrodes and a pixel definition layer disposed on the substrate, the pixel definition layer and the plurality of first electrodes do not overlap each other on the substrate;

an insulating barrier strip disposed on the pixel definition layer;

A first hole injection layer disposed on the pixel definition layer and the first electrode; the insulating barrier strip divides the first hole injection layer into a plurality of sub-hole injection layers, and the plurality of sub-holes The hole injection layer is in one-to-one correspondence with the plurality of first electrodes; and

The organic light-emitting layer and the second electrode are sequentially arranged on the first hole injection layer, wherein the organic light-emitting layer has a plurality of sub-light-emitting layers that emit light of different colors, and the plurality of sub-light-emitting layers and the plurality of light-emitting layers There is a one-to-one correspondence between the sub-hole injection layers.

In a second aspect, an embodiment of the present invention further provides a display device, where the display device includes the display panel described in any embodiment of the present invention.

In a third aspect, an embodiment of the present invention also provides a method for manufacturing a display panel, the method including:

forming a plurality of first electrodes and a pixel definition layer on the substrate, the pixel definition layer and the plurality of first electrodes do not overlap each other on the substrate;

forming an insulating barrier strip on the pixel definition layer;

A first hole injection layer is formed on the pixel definition layer and the first electrode, and the insulating barrier strip divides the first hole injection layer into a plurality of sub-hole injection layers, and the plurality of sub-hole injection layers The injection layer is in one-to-one correspondence with the plurality of first electrodes;

An organic light-emitting layer and a second electrode are sequentially formed on the first hole injection layer, wherein the organic light-emitting layer has a plurality of sub-light-emitting layers that emit light of different colors, and the plurality of sub-light-emitting layers and the plurality of sub-light emitting layers There is a one-to-one correspondence between the hole injection layers.

In the embodiment of the present invention, the first hole injection layer provided on the pixel definition layer and the first electrode is divided into a plurality of sub-hole injection layers by providing an insulating barrier strip on the pixel definition layer, and the plurality of sub-hole injection layers One-to-one correspondence with the plurality of first electrodes solves the problem of color shift caused by leakage current between pixel units of different colors at low gray scale.

Description of drawings

FIG. 1 is a schematic structural diagram of a display panel in Embodiment 1 of the present invention;

Fig. 2 is a schematic diagram of an insulating barrier strip in Embodiment 1 of the present invention;

FIG. 3 is a schematic structural diagram of a display device according to an embodiment of the present invention;

FIG. 4 is a flowchart of a method for manufacturing a display panel in Embodiment 2 of the present invention;

Fig. 5a is a schematic diagram of the first electrode and the pixel definition layer in the second embodiment of the present invention;

Fig. 5b is a schematic diagram of the manufacturing process of the insulating barrier strip in Example 2 of the present invention;

Figure 5c is a schematic diagram of the insulating barrier strip in Embodiment 2 of the present invention;

Fig. 5d is a schematic diagram of the first hole injection layer in the second embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

Embodiment one

FIG. 1 is a schematic structural diagram of a display panel in Embodiment 1 of the present invention. Referring to FIG. 1, the display panel includes:

A substrate 101; a plurality of first electrodes 102 and a pixel definition layer 103 disposed on the substrate 101, the pixel definition layer 103 and the plurality of first electrodes 102 do not overlap each other on the substrate 101;

an insulating barrier strip 104 disposed on the pixel definition layer 103;

The first hole injection layer 105 arranged on the pixel definition layer 103 and the first electrode 102; the insulating barrier strip 104 divides the first hole injection layer 105 into a plurality of sub-hole injection layers, and the plurality of sub-hole injection layers are connected with multiple sub-hole injection layers. A one-to-one correspondence of the first electrodes 102; and

The organic light-emitting layer 106 and the second electrode 107 are sequentially arranged on the first hole injection layer 105, wherein the organic light-emitting layer 106 has a plurality of sub-light-emitting layers emitting light of different colors, and the plurality of sub-light-emitting layers and the plurality of sub-hole injection layers Layers correspond to each other.

Wherein, the first electrode 102 can be an anode, the second electrode 107 can be a cathode, the first hole injection layer 105 can be made of a material doped with a high conductivity dopant, the first electrode 102 can be made of indium tin oxide, each The pixel unit has a first electrode 102 , the second electrode 107 can be made of magnesium-silver alloy, and the whole display panel uses a whole block of the second electrode 107 . When a current is applied to the display panel, the first electrode 102 injects holes into the organic light emitting layer 106 through the first hole injection layer 105 , and the second electrode 107 injects electrons into the organic light emitting layer 106 . The injected holes and electrons respectively migrate towards the oppositely charged electrodes. When the electrons and holes recombine, the organic light-emitting layer 106 emits light of the corresponding color. The light is directly emitted through the second electrode 107 or reflected by the first electrode 102 It exits through the second electrode 107 .

Optionally, the plurality of sub-light emitting layers that emit light of different colors may include a red light emitting layer 106R, a green light emitting layer 106G and a blue light emitting layer 106B. Correspondingly, the plurality of sub-hole injection layers may include a red sub-hole injection layer 105R, a green sub-hole injection layer 105G, and a blue sub-hole injection layer corresponding to the red light-emitting layer 106R, the green light-emitting layer 106G, and the blue light-emitting layer 106B, respectively. hole injection layer 105B. Since the driving voltages of pixel units of different colors are different at low gray scales, there is a voltage difference between the first electrodes 102 of pixel units of different colors. For example, at 8 gray scales, the blue pixel unit and the red pixel unit The voltage difference between the first electrodes 102 is greater than 0.8V. FIG. 2 is a schematic diagram of an insulating barrier strip in Embodiment 1 of the present invention. With reference to FIGS. The first hole injection layer 105 is divided into a plurality of sub-hole injection layers 105R, 105G and 105B, and the plurality of sub-hole injection layers 105R, 105G and 105B are respectively connected with the red pixel unit R, the green pixel unit G and the blue pixel unit B. The one-to-one correspondence between the first electrodes 102 avoids leakage current between pixel units of different colors through the first hole injection layer 105 , thereby avoiding low gray scale color shift and improving image display quality. It should be noted that the position and shape of the insulating barrier strip 104 are only shown in FIG. 2 as an example, and other layers are not shown, which is not a limitation of the present invention.

In the display panel provided in this embodiment, the first hole injection layer provided on the pixel definition layer and the first electrode is divided into a plurality of sub-hole injection layers by providing an insulating barrier strip on the pixel definition layer, and the plurality of sub-hole injection layers The hole injection layer is in one-to-one correspondence with the plurality of first electrodes, which solves the problem of color shift caused by leakage current between light emitting units of different colors at low gray scale.

Optionally, the height of the insulating barrier strip 104 may be 1.5 times to 3 times the film thickness of the first hole injection layer 105 . Specifically, since the first hole injection layer 105 is generally formed by an open mask (common mask, CMM) evaporation process to form a continuous film layer covering the first electrode 102 and the pixel definition layer 103, by setting the insulating barrier The height of the band 104 is 1.5-3 times of the film thickness of the first hole injection layer 105, which ensures that when the first hole injection layer 105 is formed, the insulating isolation band 104 can have enough height to inject the first holes The layer 105 is "opened" to divide the first hole injection layer 105 into a plurality of discontinuous sub-hole injection layers. Optionally, the height of the insulation barrier strip 104 may be 200A-300A.

Preferably, the height of the insulating barrier strip 104 can be twice the film thickness of the first hole injection layer 105, which not only ensures that the insulating barrier strip 104 can have a sufficient height to "open" the first hole injection layer 105, Dividing the first hole injection layer 105 into multiple sub-hole injection layers ensures that the insulating barrier strip 104 can be covered by other organic film layers without affecting the continuity of other film layers.

Referring to FIG. 1, the display panel may further include a second hole injection layer 108, the second hole injection layer 108 is disposed on the side of the first hole injection layer 105 adjacent to the organic light-emitting layer 106, and the second hole injection layer 108 covers the insulating barrier strip 104 and the first hole injection layer 105 . Specifically, by disposing the second hole injection layer 108 , the hole injection efficiency of the display panel is further improved, and the luminous efficiency of the organic light emitting layer 106 is improved. The second hole injection layer 108 is a continuous film layer, which can be formed by a CMM evaporation process, which reduces the process cost and difficulty of the process. In addition, the second hole injection layer 108 covers the insulating isolation zone 104 to avoid the influence of the insulating isolation zone 104. Continuity of other layers. In addition, the leakage current generated in the second hole injection layer 108 by the first electrode 102 passing through the first hole injection layer 105 is negligible, so the continuous film layer of the second hole injection layer 108 will not cause color shift.

Referring to FIG. 1 , the display panel may further include a first hole transport layer 109 disposed on a side of the second hole injection layer 108 adjacent to the organic light emitting layer 106 . The first hole transport layer 109 can not only increase the hole transport rate, but also can be used as an optical adjustment layer to improve the output efficiency of light of different colors. Specifically, different colors of light have different wavelengths, and require different thicknesses of the first hole transport layer 109 . Exemplarily, referring to FIG. 1 , corresponding to red light and green light with longer wavelengths, the output efficiency of red light and green light can be improved by setting the first hole transport layer 109 with different thicknesses.

Further, the display panel may further include: a second hole transport layer 110 , and the second hole transport layer 110 is disposed on a side of the first hole transport layer 109 adjacent to the organic light-emitting layer 106 . Specifically, the second hole transport layer 110 is a hole-conducting and electron-blocking material layer, which can not only increase the hole transport rate, but also prevent electrons from continuing to travel to the first electrode 102, so that electrons and holes can Recombination in the organic light-emitting layer 106 further improves the luminous efficiency.

Referring to FIG. 1 , the display panel may further include an electron transport layer 111 disposed on a side of the second electrode 107 adjacent to the organic light emitting layer 106 . By providing the electron transport layer 111, the electrons injected by the second electrode 107 can be effectively transported to the organic light emitting layer 106, thereby improving the luminous efficiency.

This embodiment also provides a display device. FIG. 3 is a schematic structural diagram of a display device according to an embodiment of the present invention. Referring to FIG. 3 , the display device includes the display panel 100 described in any embodiment of the present invention. The display device may be an electronic device such as a mobile phone or a tablet computer.

Embodiment two

This embodiment provides a method for manufacturing a display panel. FIG. 4 is a flowchart of a method for manufacturing a display panel in Embodiment 2 of the present invention. Referring to FIG. 4 , the method for manufacturing a display panel may include:

Step 201, forming a plurality of first electrodes and a pixel definition layer on a substrate. FIG. 5 a is a schematic diagram of the first electrode and the pixel definition layer in the second embodiment of the present invention. Referring to FIG. 5 a , the pixel definition layer 103 and the plurality of first electrodes 102 do not overlap each other on the substrate 101 . Specifically, each pixel unit corresponds to one first electrode 102 .

Step 202 , forming insulating barrier strips on the pixel definition layer.

Fig. 5b is a schematic diagram of the manufacturing process of the insulating barrier strip in the second embodiment of the present invention, and Fig. 5c is a schematic diagram of the insulating barrier strip in the second embodiment of the present invention. Referring to FIG. 5b and FIG. 5c, forming the insulating barrier strip 104 on the pixel definition layer 103 may include:

A photoresist 104 a is coated on the surface of the pixel definition layer 103 by inkjet coating, and then exposed and developed to form an insulating barrier strip 104 . Specifically, most of the existing photoresist coating methods are continuous coating, and the coating accuracy is 1um, which is relatively low. In this embodiment, inkjet coating is used for coating, and the coating accuracy is relatively high. A photoresist 104 a with a thickness of less than 200 Å can be formed, and then excess photoresist is removed by exposure and development to form an insulating barrier strip 104 . Specifically, the photoresist 104a can be coated with a high-precision inkjet printing device, and the photoresist 104a can be a negative resist.

Step 203, forming a first hole injection layer on the pixel definition layer and the first electrode.

Fig. 5d is a schematic diagram of the first hole injection layer in Example 2 of the present invention. Referring to Fig. 5d, the first hole injection layer 105 can be formed by a CMM evaporation process. Since the height of the insulating barrier strip 104 is greater than that of the first hole injection layer layer 105, the insulating barrier tape 104 "opens" the first hole injection layer 105, and divides the first hole injection layer 105 into multiple sub-hole injection layers, and the multiple sub-hole injection layers are connected to multiple The first electrodes 102 are in one-to-one correspondence. Since the first hole injection layer 105 is a discontinuous film layer, different pixel units correspond to different sub-hole injection layers. When there is an exaggerated pressure between pixel units of different colors, it cannot be generated by the first hole injection layer 105. Leakage current avoids the occurrence of color shift and improves image display quality.

Step 204, sequentially forming an organic light-emitting layer and a second electrode on the first hole injection layer.

The organic light-emitting layer has multiple sub-light-emitting layers that emit light of different colors, and the multiple sub-light-emitting layers correspond to the multiple sub-hole injection layers one by one.

Further, before forming the organic light-emitting layer, layers such as a second hole injection layer, a first hole transport layer and a second hole transport layer may be sequentially formed on the first hole injection layer. In addition, before forming the second electrode, an electron transport layer may also be formed on the organic light-emitting layer, so as to increase the electron transport rate. It should be noted that the method for forming each layer in step 204 is similar to the prior art, and will not be described one by one in this embodiment.

The display panel manufacturing method provided in this embodiment forms an insulating barrier strip on the pixel definition layer, and forms a first hole injection layer on the pixel definition layer and the first electrode, and the insulating barrier strip divides the first hole injection layer into Multiple sub-hole injection layers, one-to-one correspondence between multiple sub-hole injection layers and multiple first electrodes, solves the problem of color shift caused by leakage current between light-emitting units of different colors at low gray levels, and only needs to add one light The insulating barrier strip can be made on the existing pixel definition layer through the mask process, and the process is simple and easy to implement.

The display panel manufacturing method provided in this embodiment belongs to the same inventive concept as the display panel provided in any embodiment of the present invention, and has corresponding beneficial effects. For technical details not exhaustively described in this embodiment, reference may be made to the display panel provided by any embodiment of the present invention.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention, and the present invention The scope is determined by the scope of the appended claims.

Claims (12)

1. A kind of 1. display panel, it is characterised in that including：

   Substrate；

   Multiple first electrodes and pixel defining layer on the substrate, the pixel defining layer and the multiple first electricity are set Pole is in not interlaced overlapping on the substrate；

   The insulated barriers band being arranged in the pixel defining layer；

   The first hole injection layer being arranged in the pixel defining layer and the first electrode；The insulated barriers band is by described in First hole injection layer is divided into more sub- hole injection layers, the multiple sub- hole injection layer and the multiple first electrode one One corresponds to；And

   The organic luminous layer and second electrode being set in turn on first hole injection layer, wherein, the organic luminous layer With multiple sub- luminescent layers for sending different colours light, the multiple sub- luminescent layer and the multiple sub- hole injection layer are one by one It is corresponding.
2. 2. display panel according to claim 1, it is characterised in that the height of the insulated barriers band is empty for described first 1.5 times -3 times of cave implanted layer thicknesses of layers.
3. 3. display panel according to claim 2, it is characterised in that the height of the insulated barriers band is empty for described first 2 times of cave implanted layer thicknesses of layers.
4. 4. display panel according to claim 2, it is characterised in that the height of the insulated barriers band is 200A-300A.
5. 5. display panel according to claim 1, it is characterised in that the multiple son for sending different colours light shines Layer includes red light emitting layer, green light emitting layer and blue light-emitting layer.
6. 6. display panel according to claim 1, it is characterised in that further include：

   Second hole injection layer, second hole injection layer are arranged at first hole injection layer and close on the organic light emission The side of layer, second hole injection layer cover the insulated barriers band and first hole injection layer.
7. 7. display panel according to claim 6, it is characterised in that further include：

   First hole transmission layer, first hole transmission layer are arranged at second hole injection layer and close on the organic light emission The side of layer.
8. 8. display panel according to claim 7, it is characterised in that further include：

   Second hole transmission layer, second hole transmission layer are arranged at first hole transmission layer and close on the organic light emission The side of layer.
9. 9. display panel according to claim 1, it is characterised in that further include：

   Electron transfer layer, the electron transfer layer are arranged at the side that the second electrode closes on the organic luminous layer.
10. 10. a kind of display device, it is characterised in that including claim 1-9 any one of them display panels.
11. A kind of 11. display panel production method, it is characterised in that including：

    Multiple first electrodes and pixel defining layer are formed on substrate, the pixel defining layer and the multiple first electrode are in institute State not interlaced overlapping on substrate；

    Insulated barriers band is formed in the pixel defining layer；

    Form the first hole injection layer in the pixel defining layer and the first electrode, the insulated barriers band is by described One hole injection layer is divided into more sub- hole injection layers, and the multiple sub- hole injection layer and the multiple first electrode are one by one It is corresponding；

    Organic luminescent layer and second electrode are sequentially formed on first hole injection layer, wherein, the organic luminous layer tool There are multiple sub- luminescent layers for sending different colours light, the multiple sub- luminescent layer and the multiple sub- hole injection layer one are a pair of Should.
12. 12. according to the method for claim 11, it is characterised in that insulated barriers band is formed in the pixel defining layer Step includes：

    Photoresist is applied in the pixel definition layer surface using ink-jet coating mode, and it is described absolutely to carry out exposed and developed formation Edge barrier tape.