Display panel and display device

Abstract

The utility model provides a kind of display panel and display device.Faceplate includes: substrate and multiple subpixels;Subpixel includes organic light emitting diode, and organic light emitting diode includes anode, common layer and organic light emitting layer on substrate in turn laminated;Pixel definition layer is located in the one side of substrate and the one side of anode away from substrate;Pixel definition layer includes pixel opening, and subpixel is set in pixel opening correspondingly;At least one side wall of pixel opening is provided with rough structure;Common layer includes first part, second part and third part, and first part is located in the one side of anode away from substrate, and second part and third part are located in the one side of pixel definition layer away from substrate;First part is electrically connected with second part, and first part and third part are insulated by rough structure arrangement. By setting rough structure on the side wall of pixel opening, part structure of common layer is insulated arrangement, and the horizontal transmission of current is blocked, to prevent the occurrence of color mixing phenomenon.

Description

Technical Field

[0001] This utility model relates to the field of display technology, specifically to a display panel and display device. Background Technology

[0002] Organic Light Emitting Display (OLED) panels have many advantages, including being all-solid-state, self-emissive, having a wide viewing angle, a wide color gamut, fast response speed, high luminous efficiency, high brightness, high contrast, ultra-thinness, ultra-lightness, low power consumption, a wide operating temperature range, the ability to manufacture large-size and flexible panels, and simple manufacturing processes. They can achieve truly flexible displays and have received increasing attention and importance in the market in recent years.

[0003] In OLED display panels, hole injection layers and hole transport layers are common layers that cover all sub-pixel areas and the spaces between sub-pixels. When a sub-pixel is working, charge carriers are laterally transported to adjacent sub-pixel areas through these common layers. Neighboring sub-pixels are affected by the laterally transported charge carriers, resulting in cross-color phenomena. Utility Model Content

[0004] In view of the problems in the prior art, the purpose of this utility model is to provide a display panel and display device to improve the color mixing problem of the display panel and enhance the display effect of the display panel.

[0005] This utility model provides a display panel, including a substrate and a plurality of sub-pixels located on the substrate; each sub-pixel includes an organic light-emitting diode, and the organic light-emitting diode includes an anode, a common layer and an organic light-emitting layer sequentially stacked on the substrate.

[0006] The display panel further includes a pixel definition layer disposed on one side of the substrate and on the side of the anode facing away from the substrate; the pixel definition layer includes a pixel opening, and the sub-pixels are correspondingly disposed within the pixel opening; at least one sidewall of the pixel opening is provided with a rough structure;

[0007] The common layer includes a first part, a second part, and a third part. The first part is disposed on the side of the anode facing away from the substrate, and the second part and the third part are disposed on the side of the pixel definition layer facing away from the substrate. The first part and the second part are electrically connected, and the first part and the third part are insulated from each other by the rough structure.

[0008] In some embodiments, the pixel definition layer includes a first pixel definition layer and a second pixel definition layer disposed sequentially along a direction away from the substrate; the first pixel definition layer has a first pixel opening and the rough structure is provided on the first pixel definition layer; the second pixel definition layer has a second pixel opening corresponding to and penetrating the first pixel opening, and the second pixel opening exposes at least one sidewall of the first pixel opening.

[0009] In some embodiments, the rough structure consists of spaced-apart recesses and protrusions.

[0010] In some embodiments, the cross-section of the protrusion is triangular, semi-circular, or circular.

[0011] In some embodiments, the common layer includes at least one of a hole injection layer and a hole transport layer that are sequentially stacked on the anode in a direction away from the substrate.

[0012] In some embodiments, the organic light-emitting diode further includes a cathode layer located on the side of the organic light-emitting layer away from the substrate; wherein the cathode layer is a continuous film layer.

[0013] In some embodiments, the organic light-emitting diode further includes at least one of an electron injection layer and an electron transport layer that are sequentially stacked on the organic light-emitting layer in a direction away from the substrate.

[0014] In some embodiments, a refractive layer is further included on the side of the exposed rough structure opposite to the substrate.

[0015] In some embodiments, the rough structure is formed using a plasma process.

[0016] This utility model embodiment also provides a display device, including the display panel described above.

[0017] The display panel and display device provided by this utility model have the following advantages:

[0018] This invention provides a rough structure on the sidewall of the pixel opening to insulate a portion of the common layer structure, thereby blocking the lateral transmission of current through the common layer and preventing color mixing. Attached Figure Description

[0019] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the structure of a display panel according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the display panel structure according to another embodiment of the present invention;

[0022] Figures 3 to 5 This is a flowchart illustrating the manufacturing process of a display panel according to another embodiment of the present invention.

[0023] Figure label:

[0024] 10 Substrate 23 Organic light-emitting layer

[0025] 20 Organic Light Emitting Diode 24 Cathode

[0026] 21 Anode 30 Pixel Definition Layer

[0027] 22 common layer 30a pixel aperture

[0028] 221 Part 1 30b Rough Structure

[0029] 222 Part Two 31 First Pixel Definition Layer

[0030] 223 Part Three 32 Second Pixel Definition Layer Detailed Implementation

[0031] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that the invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0032] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate different embodiments or examples represented in this application, as well as features of different embodiments or examples.

[0033] OLED devices are current-driven organic light-emitting devices. Under the influence of an electric field, holes generated at the anode and electrons generated at the cathode of an OLED device move and migrate towards the light-emitting layer. When they meet in the light-emitting layer, recombination occurs, generating excitons that excite the light-emitting molecules to ultimately produce visible light. In existing technologies, OLED devices typically use red, green, and blue light-emitting layers arranged in a specific pattern on the same substrate as light-emitting sub-pixels. Adjacent light-emitting layers are connected by a common layer (e.g., including a hole transport layer and an electron transport layer) to form channels for the movement of holes and electrons between the light-emitting layers.

[0034] However, in actual implementation, the inventors discovered that in the OLED devices prepared by the above method, during the full display process, when the light-emitting layer is lit, holes are generated in the hole injection layer with the current. These holes flow through the hole transport layer to adjacent light-emitting layers, forming lateral crosstalk. This causes adjacent light-emitting layers to emit light due to the inflowing holes, resulting in color shift at low grayscale levels and a decrease in display quality. To address this problem, existing technologies use materials with high resistivity for the hole injection layer or hole transport layer to mitigate leakage current. However, this approach is limited by the actual materials used (for example, the driving voltage of the blue light-emitting layer is high, resulting in a large leakage current, and crosstalk due to leakage still occurs), and cannot truly solve the crosstalk problem caused by leakage.

[0035] To address the problems in the prior art, this utility model provides a display panel. For example... Figure 1 As shown, the display panel includes: a substrate 10 and a plurality of sub-pixels located on the substrate 10 (for ease of explanation, only one sub-pixel of the display panel is shown here); the sub-pixel includes an organic light-emitting diode 20, and the organic light-emitting diode 20 includes an anode 21, a common layer 22 and an organic light-emitting layer 23 sequentially stacked on the substrate 10.

[0036] A pixel definition layer 30 is disposed on one side of the substrate 10 and on the side of the anode 21 facing away from the substrate 10. The pixel definition layer 30 includes a pixel opening 30a, and sub-pixels are correspondingly disposed in the pixel opening 30a. At least one sidewall of the pixel opening 30a is provided with a rough structure 30b.

[0037] The common layer 22 includes a first part 221, a second part 222 and a third part 223. The first part 221 is disposed on the side of the anode 21 away from the substrate 10, and the second part 222 and the third part 223 are disposed on the side of the pixel definition layer 30 away from the substrate 10. The first part 221 and the second part 222 are electrically connected, and the first part 221 and the third part 223 are insulated from each other by a rough structure 30b.

[0038] By forming a rough structure 30b on at least one sidewall of the pixel opening 30a, a portion of the structure of the common layer 22 is made insulated, blocking the lateral transmission of current through the common layer 22, avoiding leakage of adjacent sub-pixels, preventing color crosstalk, and improving the display effect of the panel.

[0039] Furthermore, such as Figure 2 As shown, another embodiment of this utility model also provides a display panel. Figure 2 The display panel shown is Figure 1 The difference in the display panel shown is that the pixel definition layer 30 includes a first pixel definition layer 31 and a second pixel definition layer 32 arranged sequentially along the direction away from the substrate 10; the first pixel definition layer 31 is provided with a first pixel opening and a rough structure 30b is provided on the first pixel definition layer 31; the second pixel definition layer 32 is provided with a second pixel opening that corresponds to and penetrates the first pixel opening 31a, and the second pixel opening exposes at least one sidewall of the first pixel opening.

[0040] Since the first pixel definition layer 31 has a rough structure, the exposed sidewall of the first pixel opening has a rough structure 30b. When the common layer 22 is fabricated, the common layer 22 can be divided into a first part 221, a second part 222 and a third part 223. The first part 221 and the second part 222 are electrically connected. The second part 222 and the third part 223 are insulated by the rough structure 30b, so as to block the current from being transmitted through the common layer 22 to the adjacent sub-pixels, avoid affecting the light emission of the adjacent sub-pixels, cause crosstalk, and improve the display effect of the display panel.

[0041] Please see Figure 2 and Figure 3 In some embodiments, the rough structure 30b consists of spaced-apart recesses and protrusions. Further, in this embodiment, the cross-section of the protrusion is triangular, but it is not limited to this; for example, the cross-section of the protrusion can also be semi-circular or circular, depending on actual needs. It should be noted that the height of the protrusion and the depth of the recess must be sufficient to separate the common layer 22; for example, the height of the protrusion and the depth of the recess are greater than the thickness of the common layer 22. Specific settings can be made according to actual needs, and no specific limitations are imposed here.

[0042] In some embodiments, the common layer 22 includes at least one of a hole injection layer and a hole transport layer sequentially stacked on the anode 21 along a direction away from the substrate 10. The hole transport layer and the hole injection layer can achieve efficient hole migration and balancing, thereby improving the luminous efficiency, stability and lifetime of the OLED device.

[0043] In some embodiments, such as Figure 1 and Figure 2As shown, the organic light-emitting diode also includes a cathode layer 24 located on the side of the organic light-emitting layer 23 away from the substrate 10; wherein, the cathode layer 24 is a continuous film layer. By providing a rough structure 30b on the sidewall of the pixel opening 30a portion, or by exposing only the sidewall of the pixel opening portion of the first pixel definition layer 31, it can be ensured that the cathode layer 24 is a continuous film layer, avoiding any interruption in the cathode layer 24.

[0044] Furthermore, in some embodiments, the organic light-emitting diode 20 further includes at least one of an electron injection layer and an electron transport layer (not shown) sequentially stacked on the organic light-emitting layer 23 along a direction away from the substrate 10. The electron transport layer and the electron injection layer can achieve efficient electron migration and balance, improving the luminous efficiency, stability and lifetime of the OLED device.

[0045] In some embodiments, a roughened structure 30b is formed using a plasma process. For example, Figures 3 to 5 The preparation is shown Figure 2 A flowchart illustrating the rough structure of the display panel. (See attached diagram.) Figure 3 As shown, after the anode 21 and the first pixel definition layer 31 are fabricated on the substrate 10, the first pixel opening on the first pixel definition layer 31 is fabricated using photolithography and etching processes; as Figure 4 As shown, in the obtained Figure 3 The intermediate structure shown is formed with a roughened structure 30b on the first pixel definition layer 31 using a plasma process. It should be noted that in other embodiments, the roughened structure 30b can also be formed using wet etching or dry etching. For example... Figure 4 As shown, in the obtained Figure 3 A second pixel definition layer 32 is formed on the intermediate structure shown, and a second pixel opening is provided on the second pixel definition layer 32. The first pixel opening and the second pixel opening are opposite to and connected to each other. The second pixel opening exposes part of the sidewall of the first pixel opening, thereby exposing part of the rough structure 30b on the first pixel opening.

[0046] Furthermore, in some embodiments, the display panel further includes a refractive layer (not shown) disposed on the side of the exposed roughened structure 30b facing away from the substrate 10. Light emitted from the light-emitting layer 23, after being refracted by the refractive layer, can increase the luminous efficiency of the device. The refractive layer can be a silicon dioxide layer, a silicon nitride layer, etc. The roughened structure 30b can also achieve diffuse reflection, further improving the display effect of the panel.

[0047] To further determine the technical effect of the display panel provided in this embodiment of the present invention, the white light luminous efficiency and CIE y of the display panel provided in this embodiment of the present invention and the display panel in the prior art when displaying blue 8 gray levels were compared. The results are shown in Table 1 below.

[0048] Table 1. CIE y of the display panel of this utility model embodiment and the display panel of the prior art at blue 8 grayscale.

[0049]

[0050] CIEy reflects the "green-blue balance" tendency of color; the higher the y value, the greener the color; the lower the y value, the bluer the color. According to the table above, the display panel of this embodiment displays blue with a smaller CIEy component at 8 gray levels, indicating a more bluish color. This means the display panel provided by this invention experiences less crosstalk, has less color cast, and provides a better display effect. The display panel of this embodiment also has high white light luminous efficiency, meaning the refractive layer in the display panel provided by this invention can improve white light luminous efficiency.

[0051] Furthermore, this utility model embodiment also provides a display device, including the display panel described above, thus achieving all the technical effects of the aforementioned display panel. The display device can specifically be a mobile phone, television, computer, tablet, watch, etc., and this application does not specifically limit it to these.

[0052] In summary, the display panel and display device provided by this utility model have the following advantages:

[0053] By forming a rough structure on at least one sidewall of the pixel opening, the part of the common layer is made insulated, blocking the lateral transmission of current through the common layer, avoiding leakage of current between adjacent sub-pixels, preventing color crosstalk, and improving the display effect of the panel.

[0054] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A display panel, characterized in that, The device includes a substrate and a plurality of sub-pixels located on the substrate; each sub-pixel includes an organic light-emitting diode (OLED), and the organic light-emitting diode includes an anode, a common layer and an organic light-emitting layer sequentially stacked on the substrate. The display panel further includes a pixel definition layer disposed on one side of the substrate and on the side of the anode facing away from the substrate; the pixel definition layer includes a pixel opening, and the sub-pixels are correspondingly disposed within the pixel opening; At least one sidewall of the pixel opening has a rough structure; The common layer includes a first part, a second part, and a third part. The first part is disposed on the side of the anode facing away from the substrate, and the second part and the third part are disposed on the side of the pixel definition layer facing away from the substrate. The first part is electrically connected to the second part, and the first part is insulated from the third part by the rough structure.

2. The display panel according to claim 1, characterized in that, The pixel definition layer includes a first pixel definition layer and a second pixel definition layer disposed sequentially along a direction away from the substrate; the first pixel definition layer has a first pixel opening and the rough structure is provided on the first pixel definition layer; the second pixel definition layer has a second pixel opening corresponding to and penetrating the first pixel opening, and the second pixel opening exposes at least one sidewall of the first pixel opening.

3. The display panel according to claim 1, characterized in that, The rough structure consists of spaced-out depressions and protrusions.

4. The display panel according to claim 3, characterized in that, The cross-section of the protrusion is triangular, semi-circular, or circular.

5. The display panel according to claim 1, characterized in that, The common layer includes at least one of a hole injection layer and a hole transport layer that are sequentially stacked on the anode in a direction away from the substrate.

6. The display panel according to claim 1, characterized in that, The organic light-emitting diode further includes a cathode layer located on the side of the organic light-emitting layer away from the substrate; wherein the cathode layer is a continuous film layer.

7. The display panel according to claim 1, characterized in that, The organic light-emitting diode further includes at least one of an electron injection layer and an electron transport layer, which are sequentially stacked on the organic light-emitting layer in a direction away from the substrate.

8. The display panel according to claim 1, characterized in that, It also includes a refractive layer disposed on the side of the exposed rough structure opposite to the substrate.

9. The display panel according to claim 1, characterized in that, The rough structure is formed using a plasma process.

10. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 9.

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