Display panel and fabrication method therefor, and display apparatus

Abstract

Disclosed are a display panel and a fabrication method therefor, and a display apparatus. The display panel provided in the present disclosure comprises: a substrate; and a plurality of sub-pixels located on one side of the substrate, wherein each of the plurality of sub-pixels comprises at least one light-emitting device; each light-emitting device comprises a first electrode, a light-emitting functional layer and a second electrode, which are stacked on one side of the substrate; the plurality of sub-pixels include a plurality of first sub-pixels, a plurality of second sub-pixels and a plurality of third sub-pixels; and first electrodes of the first sub-pixels each comprise a first reflective layer, and first electrodes of the second sub-pixels and first electrodes of the third sub-pixels each comprise a second reflective layer, the reflectivity of the first reflective layer being greater than that of the second reflective layer.

Description

Display panel and its manufacturing method, display device Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to display panels, methods for their fabrication, and display devices. Background Technology

[0002] Organic Light Emitting Diode (OLED) microdisplays, as one type of OLED technology, utilize integrated circuits (ICs) on the backplane to control the OLED, significantly increasing the panel's resolution. This increased resolution makes it difficult to perform vapor deposition using traditional side-by-side monochrome device processes. Therefore, OLED microdisplays typically undergo full-surface vapor deposition, employing a partitioned structure to separate the OLED film layers, forming independent pixels. However, this arrangement alters the top cathode morphology, leading to reduced blue light emission efficiency and further widening the light emission differences between different sub-pixels, resulting in poor uniformity of light output and negatively impacting display quality. Summary of the Invention

[0003] This disclosure provides a display panel, which includes:

[0004] Base;

[0005] Multiple sub-pixels are located on one side of a substrate; each sub-pixel includes at least one light-emitting device; the light-emitting device includes: a first electrode, a light-emitting functional layer, and a second electrode stacked on one side of the substrate; the multiple sub-pixels include: multiple first sub-pixels, multiple second sub-pixels, and multiple third sub-pixels; the first electrode of the first sub-pixel includes: a first reflective layer; the first electrodes of the second sub-pixels and the first electrodes of the third sub-pixels include: a second reflective layer; the reflectivity of the first reflective layer is greater than the reflectivity of the second reflective layer.

[0006] In some embodiments, the thickness of the first reflective layer is not equal to the thickness of the second reflective layer.

[0007] In some embodiments, the distance between the surface of the first reflective layer away from the substrate and the surface of the second electrode facing the substrate is a first distance, and the distance between the surface of the second reflective layer away from the substrate and the surface of the second electrode facing the substrate is a second distance;

[0008] The first distance is not equal to the second distance.

[0009] In some embodiments, the first sub-pixel emits light of a first color; the ratio of the first distance to the wavelength of the first color light is a positive integer.

[0010] In some embodiments, the first electrode of the first sub-pixel further includes: a first contact layer located between the first reflective layer and the substrate, and a second contact layer located on the side of the first reflective layer facing away from the substrate;

[0011] The first electrode of the second sub-pixel and the third sub-pixel also includes: a third contact layer located between the second reflective layer and the substrate, and a fourth contact layer located on the side of the second reflective layer away from the substrate;

[0012] The first contact layer and the third contact layer have the same thickness.

[0013] In some embodiments, the first contact layer and the third contact layer are made of the same material and are disposed in the same layer.

[0014] In some embodiments, the thickness of the first reflective layer is greater than the thickness of the second reflective layer, and the thickness of the second contact layer is less than the thickness of the fourth contact layer; or...

[0015] The thickness of the first reflective layer is less than the thickness of the second reflective layer, and the thickness of the second contact layer is greater than the thickness of the fourth contact layer.

[0016] In some embodiments, both the third contact layer and the fourth contact layer include: a first sub-contact layer that contacts the light-emitting functional layer;

[0017] The first reflective layer and / or the second reflective layer are in direct contact with the first sub-contact layer.

[0018] In some embodiments, both the third contact layer and the fourth contact layer include: a first sub-contact layer that contacts the light-emitting functional layer; and at least one of the first reflective layer and the second reflective layer that does not directly contact the first sub-contact layer.

[0019] The third contact layer and / or the fourth contact layer further include a second sub-contact layer located on the side of the first sub-contact layer facing the substrate.

[0020] In some embodiments, the material of the first reflective layer includes silver, and the material of the second reflective layer includes aluminum;

[0021] The material of the first sub-contact layer includes indium tin oxide;

[0022] The material of the second sub-contact layer includes titanium or titanium nitride;

[0023] The first contact layer and the third contact layer include one of the following: titanium, titanium nitride, or a stack of titanium and titanium nitride.

[0024] In some embodiments, the first electrode includes: a first surface and a second surface parallel to the plane of the substrate, and a first side surface connecting the first surface and the second surface; the second surface is located on the side of the first surface away from the substrate; the angle between the first side surface and the first surface is greater than 30° and less than 90°.

[0025] In some embodiments, the angle between the first side surface of the first sub-pixel and the first surface is a first angle, and the angle between the first side surface of the second sub-pixel and the first surface is a second angle, wherein the first angle is greater than the second angle.

[0026] This disclosure provides a method for manufacturing a display panel, comprising:

[0027] Provide a base;

[0028] A second reflective layer is formed on one side of the substrate;

[0029] A patterning process is applied to the second reflective layer to form a pattern of the second reflective layer in the regions of the second and third sub-pixels.

[0030] A first reflective layer is formed on the side of the second reflective layer that faces away from the substrate; the reflectivity of the first reflective layer is greater than the refractive index of the second reflective layer.

[0031] A patterning process is applied to the first reflective layer to form a pattern of the first reflective layer in the region of the first sub-pixel;

[0032] A light-emitting functional layer and a second electrode are sequentially formed on the side of the first and second reflective layers that are away from the substrate.

[0033] In some embodiments, before forming the second reflective layer on one side of the substrate, the method further includes:

[0034] Forming the first metal contact layer;

[0035] Before patterning the second reflective layer, the process also includes:

[0036] A fourth contact layer is formed on the side of the second reflective layer that faces away from the substrate;

[0037] The patterning process for the second reflective layer specifically includes:

[0038] A patterning process is performed on the fourth contact layer and the second reflective layer to form patterns of the second reflective layer and the fourth contact layer in the areas of the second sub-pixel and the third sub-pixel.

[0039] Before patterning the first reflective layer, the process also includes:

[0040] A second contact layer is formed on the side of the first reflective layer that faces away from the substrate;

[0041] The patterning process for the first reflective layer specifically includes:

[0042] A patterning process is performed on the second contact layer, the first reflective layer, and the first metal contact layer to form a first electrode pattern including the third contact layer, the second reflective layer, and the fourth contact layer in the regions of the second sub-pixel and the third sub-pixel, and to form a first electrode pattern including the first contact layer, the first reflective layer, and the second contact layer in the region of the first sub-pixel.

[0043] This disclosure provides a display device, which includes a display panel provided in this disclosure. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 is a schematic diagram of the structure of a display panel provided in an embodiment of this disclosure;

[0046] Figure 2 is a schematic diagram of another display panel provided in an embodiment of this disclosure;

[0047] Figure 3 is a schematic diagram of the structure of another display panel provided in an embodiment of this disclosure;

[0048] Figure 4 is a schematic diagram of the structure of another display panel provided in an embodiment of this disclosure;

[0049] Figure 5 is a schematic diagram of the structure of another display panel provided in an embodiment of this disclosure;

[0050] Figure 6 is a schematic diagram of the structure of another display panel provided in an embodiment of this disclosure;

[0051] Figure 7 is a schematic diagram of the structure of another display panel provided in an embodiment of this disclosure;

[0052] Figure 8 is a schematic diagram of the structure of another display panel provided in an embodiment of this disclosure;

[0053] Figure 9 is a schematic flowchart of a method for manufacturing a display panel according to an embodiment of this disclosure;

[0054] Figure 10 is a flowchart illustrating another method for preparing a display panel according to an embodiment of this disclosure. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Furthermore, the embodiments and features in the embodiments of this disclosure can be combined with each other without conflict. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0056] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that an element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0057] It should be noted that the dimensions and shapes of the figures in the accompanying drawings do not reflect actual proportions and are intended only to illustrate the content of this disclosure. Furthermore, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0058] This disclosure provides a display panel, as shown in Figures 1 and 2, the display panel including:

[0059] Base 1;

[0060] Multiple sub-pixels 2 are located on one side of the substrate 1; each sub-pixel 2 includes at least one light-emitting device 3; the light-emitting device 3 includes: a first electrode 4, a light-emitting functional layer 5, and a second electrode 6 stacked on one side of the substrate 1; the multiple sub-pixels 2 include: multiple first sub-pixels 201, multiple second sub-pixels 202, and multiple third sub-pixels 203; the first electrode 4 of the first sub-pixel 201 includes: a first reflective layer 401; the first electrode 4 of the second sub-pixel 202 and the first electrode 4 of the third sub-pixel 203 include: a second reflective layer 402; the reflectivity of the first reflective layer 401 is greater than the reflectivity of the second reflective layer 402.

[0061] The display panel provided in this disclosure includes a first electrode of a first sub-pixel comprising a first reflective layer, wherein the reflectivity of the first reflective layer is greater than that of the second reflective layer. This means the reflectivity of the reflective layers in the first sub-pixel is greater than that in the other sub-pixels, which improves the luminous efficiency of the first sub-pixel, thereby enhancing the uniformity of luminous efficiency among different sub-pixels. This results in a more balanced current distribution among different sub-pixels, reducing the load on the first sub-pixel, increasing its lifespan, and simultaneously improving the gamma yield and brightness uniformity of the display panel. Furthermore, since the first electrodes of the second and third sub-pixels both include a second reflective layer (i.e., the reflectivity of the reflective layers in the first electrodes of the second and third sub-pixels is the same), differentiating only the first electrode of the first sub-pixel can improve the luminous efficiency of the first sub-pixel while avoiding excessive increases in the design and manufacturing complexity of the display panel.

[0062] In some embodiments, the first sub-pixel is a blue sub-pixel, the second sub-pixel is a red sub-pixel, and the third sub-pixel is a green sub-pixel.

[0063] In some embodiments, the first electrode is, for example, the anode of a light-emitting device, and the second electrode is, for example, the cathode of a light-emitting device.

[0064] In some embodiments, the second electrode includes a transparent electrode. The first electrode includes a first reflective layer or a second reflective layer, and the second electrode is a transparent electrode, i.e., the light-emitting device is a top-emitting light-emitting device. Light emitted from the light-emitting functional layer is reflected by the first or second reflective layer and then emitted from the second electrode.

[0065] In some embodiments, as shown in FIG1, the second electrodes 6 corresponding to multiple sub-pixels 2 are integrally connected.

[0066] In specific implementations, the display panel provided in the embodiments of this disclosure can be a micro organic light-emitting diode (Micro OLED) display panel.

[0067] In a specific implementation, the substrate of the Micro OLED display panel is, for example, a silicon-based substrate. The silicon-based substrate includes: a silicon substrate, a planarization layer located between the silicon substrate and the light-emitting device, and a driving circuit layer located between the silicon substrate and the planarization layer. The planarization layer is made of, for example, silicon oxide; the driving circuit layer is, for example, an integrated circuit, and includes pixel driving circuits electrically connected to the light-emitting devices one-to-one; the pixel driving circuits may include, for example, complementary metal-oxide-semiconductor transistors.

[0068] In practical implementation, the driving circuit layer of the Micro OLED display panel uses an integrated circuit including complementary metal-oxide-semiconductor transistors, resulting in a smaller pixel driving circuit size, thereby improving the resolution of the display panel; a resolution greater than 3000 pixel density (PPI) can be achieved for the Micro OLED display panel. That is, the display panel provided in this disclosure embodiment is a high-resolution display panel.

[0069] In some embodiments, as shown in FIG2, the light-emitting device 3 is a white light-emitting device; the display panel further includes: a color filter 10 located on the side of the light-emitting device 3 away from the substrate 1, and a light-shielding layer 11 located between adjacent color filters 10.

[0070] In a specific implementation, as shown in Figure 2, the color filter 10 includes: a first color filter 1001 located in the first sub-pixel 201, a second color filter 1002 located in the second sub-pixel 202, and a third color filter 1003 located in the third sub-pixel 203.

[0071] In specific implementation, when the first sub-pixel is a blue sub-pixel, the second sub-pixel is a red sub-pixel, and the third sub-pixel is a green sub-pixel, then the first color filter is a blue color filter, the second color filter is a red color filter, and the third color filter is a green color filter.

[0072] It should be noted that due to the high resolution of Micro OLED display panels, while traditional fine metal masks (FMMs) can only achieve a maximum resolution of around 800 PPI, it is difficult to use FMMs for the deposition of organic light-emitting layers in a side-by-side (SBS) configuration. Therefore, when the light-emitting device is a white light-emitting device, a full-surface deposition process can be used to achieve high-resolution display. The display panel also includes a color filter, so that the light emitted by the white light-emitting device can be emitted with the same color as the sub-pixels after passing through the color filter, thus achieving full-color display.

[0073] In a specific implementation, the light-emitting functional layer includes at least one light-emitting unit, and the light-emitting unit includes an organic light-emitting layer.

[0074] In some embodiments, as shown in FIG3, the light-emitting functional layer 5 includes a plurality of light-emitting units 501 and a charge-generating layer 502 located between the light-emitting units 501; the plurality of light-emitting units 501 are stacked between the first electrode 4 and the second electrode 6.

[0075] It should be noted that when the light-emitting device includes only one light-emitting unit, and white light is achieved using a single organic light-emitting layer, the brightness of the light-emitting device is usually not high. If a display panel including this light-emitting device is used to achieve high brightness display, the power consumption of the display panel needs to be increased, affecting the lifespan of the display panel. The display panel provided in this disclosure includes a light-emitting device comprising multiple light-emitting units, each of which includes an organic light-emitting layer. Thus, the light emitted by the light-emitting device is the effect of multiple light-emitting units superimposed, which can improve the brightness of the light-emitting device, thereby reducing the power consumption of the display panel and extending its lifespan.

[0076] It should be noted that Figure 3 illustrates the example of a light-emitting device 3 comprising two stacked light-emitting units 501. In some embodiments, as shown in Figure 3, the light-emitting device 3 includes: a first light-emitting unit 501-1, and a second light-emitting unit 501-2 located on the side of the first light-emitting unit 501-1 facing away from the substrate 1;

[0077] The first light-emitting unit 501-1 includes: a red light organic light-emitting layer r' and a green light organic light-emitting layer g' located on the side of the red light organic light-emitting layer r' away from the substrate 1;

[0078] The second light-emitting unit 501-2 includes: a blue light-emitting organic light-emitting layer b'.

[0079] In practice, the charge generation layer is used to generate electrons and holes, thereby providing electrons to the first light-emitting unit and holes to the second light-emitting unit.

[0080] In some embodiments, as shown in FIG7, the first light-emitting unit 501-1 further includes: a hole injection layer 503 located between the red organic light-emitting layer r' and the first electrode 4, a hole transport layer 504 located between the red organic light-emitting layer r' and the hole injection layer 503, and an electron transport layer 505 located between the green organic light-emitting layer g' and the charge generation layer 502; the second light-emitting unit 501-2 further includes: a hole injection layer 503 located between the blue organic light-emitting layer b' and the charge generation layer 502, two hole transport layers 504 located between the blue organic light-emitting layer b' and the hole injection layer 503, an electron transport layer 505 located between the blue organic light-emitting layer b' and the second electrode 6, a hole blocking layer 506 located between the blue organic light-emitting layer b' and the electron transport layer 505, and an electron injection layer 507 located between the electron transport layer 505 and the second electrode 6.

[0081] It should be noted that, because the blue OLED layer is located above the red and green OLED layers in each light-emitting device, the blue OLED layer is more susceptible to leakage paths caused by puncture from the second electrode compared to the red and green OLED layers. This results in reduced blue light emission efficiency and can lead to significant differences in light output between sub-pixels. Furthermore, since full-color display requires a color filter, the blue color filter has lower transmittance. Related technologies typically require a larger current to supply blue light, increasing the load on the blue light unit and reducing its lifespan compared to red and green light. This affects the overall lifespan of the display panel and also increases the proportion of red and green light during use, causing the image to gradually turn yellow and affecting the display effect. The display panel provided in this embodiment has a reflectivity of the reflective layer of the first electrode in the blue sub-pixel that is greater than that in the reflective layers of the first electrode in the red and green sub-pixels. This can improve the light efficiency of the blue sub-pixel, thereby improving the uniformity of the light efficiency of the blue, red, and green sub-pixels. This makes the current distribution among the blue, red, and green sub-pixels more balanced, reduces the load on the blue sub-pixel, increases the lifespan of the blue light unit, avoids yellowing of the screen, and improves the display effect of the display panel.

[0082] In practice, the hole injection layer, hole transport layer, electron transport layer, hole blocking layer, electron injection layer, and charge generation layer can all be prepared using a full-surface vapor deposition process.

[0083] In some embodiments, the hole injection layer, hole transport layer, electron transport layer, hole blocking layer, electron injection layer, and charge generation layer corresponding to different sub-pixels can be integrally connected, that is, the hole injection layer, hole transport layer, electron transport layer, hole blocking layer, electron injection layer, and charge generation layer are common layers.

[0084] Alternatively, in some embodiments, as shown in Figures 1 to 3, the display panel further includes a plurality of partition structures 12; the area between the orthographic projection of the partition structure 12 onto the substrate 1 and the orthographic projection of the adjacent first electrode 4 onto the substrate 1 overlaps.

[0085] In practice, the partition structure is located in the area between the light-emitting areas of the sub-pixels, which is used to break the charge generation layer formed by the whole surface vapor deposition at the partition structure.

[0086] It should be noted that the charge generation layer has a high lateral conductivity. If the charge generation layer is continuous between adjacent sub-pixels, it can easily lead to color cross-contamination between sub-pixels. The display panel provided in this embodiment is provided with a partition structure that breaks the charge generation layer formed by vapor deposition across the entire surface at the partition structure to avoid color cross-contamination between sub-pixels.

[0087] In practical implementation, the partition structure can be, for example, a tall fence (TF), a hole between pixels (Dig on wafer (DOW), or an undercut.

[0088] In some embodiments, as shown in Figures 1 to 3, the partition structure 12 includes a first partition groove 901 formed by the pixel definition layer 9. This causes the charge generation layer formed by vapor deposition across the entire surface to be disconnected in the region corresponding to the first partition groove structure.

[0089] In some embodiments, as shown in FIG1, the thickness of the first reflective layer 401 is equal to the thickness of the second reflective layer 402.

[0090] Alternatively, in some embodiments, as shown in Figures 4 and 5, the thickness of the first reflective layer 401 is not equal to the thickness of the second reflective layer 402. In Figure 4, the thickness of the first reflective layer 401 is less than the thickness of the second reflective layer 402, and in Figure 5, the thickness of the first reflective layer 401 is greater than the thickness of the second reflective layer 402.

[0091] The display panel provided in this embodiment has a first reflective layer thickness that is not equal to the second reflective layer thickness. This facilitates the realization that the microcavity length of the light-emitting device in the first sub-pixel is different from that in the second and third sub-pixels. Since the wavelengths of red, green, and blue light are different, the different microcavities of the different sub-pixels help to ensure a more balanced output of red, green, and blue light, thereby improving the brightness uniformity of the product.

[0092] In some embodiments, as shown in Figures 4 and 5, the distance between the surface of the first reflective layer 401 away from the substrate 1 and the surface of the second electrode 6 facing the substrate 1 is a first distance h1, and the distance between the surface of the second reflective layer 402 away from the substrate 1 and the surface of the second electrode 6 facing the substrate 1 is a second distance h2.

[0093] The first distance h1 is not equal to the second distance h2.

[0094] It should be noted that in Figure 4, the first distance h1 is less than the second distance h2, while in Figure 5, the first distance h1 is greater than the second distance h2. The first distance h1 is the microcavity length of the light-emitting device 3 corresponding to the first sub-pixel 201, and the second distance h2 is the microcavity length of the light-emitting device 3 corresponding to the second sub-pixel 202 and the third sub-pixel 203.

[0095] In some embodiments, the first sub-pixel emits light of a first color; the ratio of the first distance to the wavelength of the first color light is a positive integer. This can further improve the luminous efficacy of the first color light. When the first sub-pixel is a blue sub-pixel, the first color light is blue light. That is, the ratio of the first distance to the wavelength of blue light is a positive integer to improve the luminous efficacy of blue light.

[0096] In some embodiments, the material of the first reflective layer includes silver (Ag), and the material of the second reflective layer includes aluminum (Al).

[0097] It should be noted that the reflectivity of aluminum ranges from approximately 80% to 90%, and the reflectivity of silver ranges from approximately 95% to 99%. The display panel provided in this embodiment achieves a reflectivity of the first reflective layer greater than that of the second reflective layer, while ensuring that the reflectivity of both layers is within a high range, thereby guaranteeing that each sub-pixel has high light efficiency.

[0098] Of course, other metallic materials can also be used for the first and second reflective layers. In some embodiments, the material of the first reflective layer includes an aluminum-copper alloy with a reflectivity ranging from approximately 80% to 90%. The material of the second reflective layer includes copper with a reflectivity ranging from approximately 70% to 80%.

[0099] In some embodiments, as shown in FIG1, FIG4 to FIG7, the first electrode 4 of the first sub-pixel 201 further includes: a first contact layer 403 located between the first reflective layer 401 and the substrate 1, and a second contact layer 404 located on the side of the first reflective layer 401 away from the substrate 1.

[0100] The first electrode 4 of the second sub-pixel 202 and the third sub-pixel 203 further includes: a third contact layer 405 located between the second reflective layer 402 and the substrate 1, and a fourth contact layer 406 located on the side of the second reflective layer 402 away from the substrate 1.

[0101] Both the third contact layer 405 and the fourth contact layer 406 include a first sub-contact layer 7 that contacts the light-emitting functional layer 5.

[0102] In specific implementations, the adhesion between the first reflective layer, the second reflective layer, and the substrate is relatively weak. A first contact layer is disposed between the first reflective layer and the substrate, and a third contact layer is disposed between the second reflective layer and the substrate. This enhances the adhesion between the first reflective layer, the second reflective layer, and the substrate, thereby avoiding the risk of peeling caused by poor adhesion between the first reflective layer, the second reflective layer, and the substrate in direct contact. In some embodiments, the first contact layer and the third contact layer include one of the following: titanium, titanium nitride, or a stack of titanium and titanium nitride.

[0103] In some embodiments, the first sub-contact layer comprises a high work function metal, which serves as the interface between the first electrode and the light-emitting functional layer, allowing electrons to escape more easily from the first electrode. The material of the first sub-contact layer includes indium tin oxide (ITO).

[0104] In some embodiments, as shown in Figures 1 and 4-7, the first contact layer 403 and the third contact layer 405 have the same thickness. In some embodiments, the first contact layer and the third contact layer are made of the same material and are disposed in the same layer.

[0105] The display panel provided in this embodiment has the same thickness for the first contact layer and the third contact layer, so that the first contact layer and the third contact layer can be set in the same layer, that is, they can be formed in one patterning process, which can simplify the process flow.

[0106] In some embodiments, the first contact layer and the third contact layer include one of the following: titanium (Ti), titanium nitride (TiN), or a stack of titanium and titanium nitride.

[0107] In some embodiments, when the first contact layer and the third contact layer comprise titanium nitride, the titanium nitride is in contact with the first reflective layer or the second reflective layer. That is, when the first contact layer and the third contact layer comprise a stack of titanium and titanium nitride, the titanium nitride layer is located on the side of the titanium layer away from the substrate.

[0108] It should be noted that when the material of the second reflective layer includes aluminum, the aluminum reflective layer is prone to curling. Placing titanium nitride in contact with at least one of the two sides of the aluminum reflective layer can improve the flatness of the aluminum reflective layer.

[0109] In some embodiments, as shown in FIG6 and FIG7, at least one of the first reflective layer 401 and the second reflective layer 402 is not in direct contact with the first sub-contact layer 7.

[0110] The third contact layer 405 and / or the fourth contact layer 406 further include a second sub-contact layer 8 located on the side of the first sub-contact layer 7 facing the substrate 1.

[0111] It should be noted that direct contact between the reflective layer and ITO can easily lead to the formation of a redox interface at their interface, affecting the stability of the first electrode. By placing a second sub-contact layer on the side of the first sub-contact layer facing the substrate, contact between the reflective layer and the first sub-contact layer can be avoided, reducing oxide generation and improving the stability of the first electrode.

[0112] In some embodiments, the material of the second sub-contact layer includes titanium or titanium nitride.

[0113] In some embodiments, when both the third contact layer and the fourth contact layer include titanium nitride in contact with the second reflective layer, the flatness of the second reflective layer can be further improved.

[0114] In some embodiments, neither the first reflective layer 401 nor the second reflective layer 402 in FIG6 are in direct contact with the first sub-contact layer 7, that is, both the third contact layer 405 and the fourth contact layer 406 include a second sub-contact layer 8.

[0115] In some embodiments, when both the third contact layer and the fourth contact layer include a second sub-contact layer, the materials of the second sub-contact layers of the two layers may be the same or different.

[0116] In some embodiments, as shown in FIG1 and FIG7, the first reflective layer 401 and / or the second reflective layer 402 are in direct contact with the first sub-contact layer 7.

[0117] It should be noted that when a second sub-contact layer is disposed between the first sub-contact layer and the first or second reflective layer, the transmittance of the second sub-contact layer is lower than that of the first sub-contact layer, and the placement of the second sub-contact layer will affect the light efficiency. Furthermore, as shown in Figures 1 and 7, at least the first reflective layer 40 is in direct contact with the first sub-contact layer 7. This can further improve the light efficiency of the first sub-pixel. In Figure 1, both the first reflective layer 401 and the second reflective layer 402 are in direct contact with the first sub-contact layer 7. In Figure 7, the second reflective layer 402 is not in direct contact with the first sub-contact layer 7, while the first reflective layer 401 is in direct contact with the first sub-contact layer 7.

[0118] It should be noted that aluminum forms a redox interface with ITO more readily, while silver does not. Therefore, the fact that the second contact layer does not include a second sub-contact layer has a relatively small impact on the stability of the first electrode.

[0119] In some embodiments, the second reflective layer is an aluminum-doped film of nickel (Ni), copper (Cu), and lanthanum (La). In this case, the second reflective layer can also be in direct contact with the first sub-contact layer. Adding Ni, Cu, and La alloying elements to the Al matrix will cause AlNi intermetallic compounds to precipitate at the grain boundaries, reducing oxide formation. La, being highly reactive, will preferentially combine with O, improving the thermal stability of the first electrode.

[0120] In some embodiments, as shown in FIG5, the thickness of the first reflective layer 401 is greater than the thickness of the second reflective layer 402, and the thickness of the second contact layer 404 is less than the thickness of the fourth contact layer 406; or,

[0121] As shown in Figure 4, the thickness of the first reflective layer 401 is less than the thickness of the second reflective layer 402, and the thickness of the second contact layer 404 is greater than the thickness of the fourth contact layer 406.

[0122] It should be noted that when the thickness of the first reflective layer is not equal to the thickness of the second reflective layer, the thickness of the second contact layer can be adjusted so that the ratio of the first distance to the wavelength of the first color light is a positive integer.

[0123] In some embodiments, the thickness of the first contact layer and the third contact layer is greater than or equal to 50 angstroms. and less than or equal to The thickness of the second sub-contact layer is greater than or equal to and less than or equal to The thickness of the first sub-contact layer is greater than or equal to and less than or equal to The thicknesses of the first reflective layer and the second reflective layer are greater than or equal to... and less than or equal to

[0124] In some embodiments, when the structure of the first electrode in the second sub-pixel and the third sub-pixel is Ti / Al / Ti / ITO, the thickness of Ti in the third contact layer is greater than or equal to and less than or equal to The thickness of Ti in the fourth contact layer is greater than or equal to and less than or equal to The thickness of ITO is greater than or equal to and less than or equal to The thickness of Al is greater than or equal to and less than or equal to When the structure of the first electrode in the first sub-pixel is Ti / Ag / ITO, then the thickness of Ti is greater than or equal to and less than or equal to The thickness of ITO is greater than or equal to and less than or equal to The thickness of Ag is greater than or equal to and less than or equal to

[0125] In some embodiments, as shown in FIG1 and FIG8, the first electrode 4 includes: a first surface 407 and a second surface 408 parallel to the plane of the substrate 1, and a first side surface 409 connecting the first surface 407 and the second surface 408; the second surface 408 is located on the side of the first surface 407 away from the substrate 1; the angle α between the first side surface 409 and the first surface 407 is greater than 30° and less than 90°.

[0126] It should be noted that, with a fixed area occupied by the first surface, the larger the angle α between the first side and the first surface, the larger the area of ​​the first electrode in the forward direction, i.e., the area of ​​the second surface, and the higher the light emission efficiency of the first electrode in the forward direction. However, if the angle α between the first side and the first surface is too large, it will make it more difficult for the pixel definition layer to climb up the first side, and the pixel definition layer may be exposed on the first side. This will subsequently cause the first electrode to overlap with the common layer in the light-emitting functional layer, affecting the normal operation of the light-emitting device.

[0127] The display panel provided in this embodiment has an angle α between the first side and the first surface that is greater than 30° and less than 90°. This can reduce the difficulty of the pixel definition layer climbing the first side while ensuring the area of ​​the first electrode, i.e. the area of ​​the second surface. This avoids the problem that the pixel definition layer cannot cover the first side, causing the common layer in the first electrode and the light-emitting functional layer to overlap.

[0128] In some embodiments, as shown in FIG1 and FIG8, the angle α between the first side surface 409 and the first surface 407 of the first sub-pixel 201 is the first angle α1, and the angle α between the first side surface 409 and the first surface 407 of the second sub-pixel 202 and the third sub-pixel 203 is the second angle α2.

[0129] In some embodiments, as shown in FIG1, the first angle a1 is equal to the second angle a2.

[0130] Alternatively, in some embodiments, as shown in Figures 1 and 8, the first angle a1 is greater than the second angle a2. Therefore, with the area occupied by each sub-pixel on the first surface fixed, the area of ​​the first sub-pixel on the front surface of the first electrode (i.e., the second surface) can be increased, thereby improving the forward light emission efficiency of the first sub-pixel.

[0131] In some embodiments, as shown in FIG2, the display panel further includes an encapsulation layer 12 located on the side of the light-emitting device 3 facing away from the substrate 1.

[0132] In specific implementations, the encapsulation layer may include, for example, an inorganic encapsulation layer / organic encapsulation layer / inorganic encapsulation layer stacked together.

[0133] Based on the same inventive concept, this disclosure also provides a method for manufacturing a display panel, as shown in FIG9, including:

[0134] S101, Provides a substrate;

[0135] S102. A second reflective layer is formed on one side of the substrate;

[0136] S103. Perform a patterning process on the second reflective layer to form a pattern of the second reflective layer in the area of ​​the second sub-pixel and the third sub-pixel.

[0137] S104. A first reflective layer is formed on the side of the second reflective layer away from the substrate; the reflectivity of the first reflective layer is greater than the refractive index of the second reflective layer.

[0138] S105. Perform a patterning process on the first reflective layer to form a pattern of the first reflective layer in the area of ​​the first sub-pixel.

[0139] S106. A light-emitting functional layer and a second electrode are sequentially formed on the side of the first reflective layer and the second reflective layer away from the substrate.

[0140] The display panel fabrication method provided in this disclosure first forms the first electrodes of the second and third sub-pixels, and then forms the first electrode of the first sub-pixel. This allows the reflectivity of the reflective layer in the first sub-pixel to be greater than that in the reflective layers of the other sub-pixels, improving the luminous efficacy of the first sub-pixel and thus enhancing the uniformity of luminous efficacy among different sub-pixels. This results in a more balanced current distribution among different sub-pixels, reducing the load on the first sub-pixel, increasing its lifespan, improving the gamma yield of the display panel, and enhancing the uniformity of brightness in the display panel.

[0141] In some embodiments, before forming the second reflective layer on one side of the substrate, the method further includes:

[0142] Forming the first metal contact layer;

[0143] Before patterning the second reflective layer, the process also includes:

[0144] A fourth contact layer 406 is formed on the side of the second reflective layer that is away from the substrate;

[0145] The patterning process for the second reflective layer specifically includes:

[0146] A patterning process is performed on the fourth contact layer and the second reflective layer to form patterns of the second reflective layer and the fourth contact layer in the areas of the second sub-pixel and the third sub-pixel.

[0147] Before patterning the first reflective layer, the process also includes:

[0148] A second contact layer is formed on the side of the first reflective layer that faces away from the substrate;

[0149] The patterning process for the first reflective layer specifically includes:

[0150] A patterning process is performed on the second contact layer, the first reflective layer, and the first metal contact layer to form a first electrode pattern including the third contact layer, the second reflective layer, and the fourth contact layer in the regions of the second sub-pixel and the third sub-pixel, and to form a first electrode pattern including the first contact layer, the first reflective layer, and the second contact layer in the region of the first sub-pixel.

[0151] Next, the preparation steps of the first electrode in the display panel provided in this embodiment will be described in detail, as shown in Figure 10, including:

[0152] S201. A first metal contact layer 13, a second reflective layer 402, and a fourth contact layer 406 are sequentially formed on one side of the substrate 1. Photoresist 14 is coated on the side of the fourth contact layer 406 away from the substrate 1.

[0153] S202, Perform a patterning process on the fourth contact layer 406 and the second reflective layer 402 to form patterns of the second reflective layer 402 and the fourth contact layer 406 in the areas of the second sub-pixel 202 and the third sub-pixel 203; that is, this step removes the second reflective layer 402 and the fourth contact layer 406 in the area of ​​the first sub-pixel 201; remove the photoresist 14.

[0154] S203, a first reflective layer 401 and a second contact layer 404 are formed sequentially, and photoresist 14 is coated on the side of the second contact layer 404 away from the substrate 1.

[0155] S204. Perform a patterning process on the second contact layer 404, the first reflective layer 401, and the first metal contact layer 13 to form a pattern of the first contact layer 403, the first reflective layer 401, and the second contact layer 404 in the area of ​​the first sub-pixel 201, and to form a pattern of the third contact layer 405 in the areas of the second sub-pixel 202 and the third sub-pixel 203; remove the photoresist 14.

[0156] In some embodiments, before forming the light-emitting functional layer, a pattern for forming a pixel definition layer is also included;

[0157] After forming the second electrode, the process also includes forming an encapsulation layer, a light-shielding layer, and a color filter.

[0158] The specific structures of the pixel definition layer, light-emitting functional layer, encapsulation layer, light-shielding layer, and color filter are described in the display panel embodiment section and will not be repeated here. The various layers of the light-emitting functional layer are formed, for example, using a full-area vapor deposition process.

[0159] Based on the same inventive concept, this disclosure also provides a display device, which includes the display panel provided in this disclosure.

[0160] The display device provided in this disclosure includes any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator. Other essential components of this display device are understood by those skilled in the art and will not be described in detail here, nor should they be construed as limiting this disclosure. Implementation of this display device can be found in the embodiments of the display panel described above; repeated details will not be elaborated upon.

[0161] In summary, the display panel, its fabrication method, and display device provided in this disclosure include a first electrode of the first sub-pixel comprising a first reflective layer, wherein the reflectivity of the first reflective layer is greater than that of the second reflective layer. This means the reflectivity of the reflective layers in the first sub-pixel is greater than that in the other sub-pixels, which improves the luminous efficacy of the first sub-pixel, thereby enhancing the uniformity of luminous efficacy among different sub-pixels. This results in a more balanced current distribution among different sub-pixels, reducing the load on the first sub-pixel, increasing its lifespan, and simultaneously improving the gamma yield and brightness uniformity of the display panel. Furthermore, since the first electrodes of the second and third sub-pixels both include a second reflective layer (i.e., the reflectivity of the reflective layers in the first electrodes of the second and third sub-pixels is the same), differentiating only the first electrode of the first sub-pixel can improve the luminous efficacy of the first sub-pixel while avoiding excessive increases in the design and fabrication complexity of the display panel.

[0162] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0163] Obviously, those skilled in the art can make various modifications and variations to this disclosure without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims of this disclosure and their equivalents, this disclosure is also intended to include such modifications and variations.

Claims

1. A display panel, wherein, The display panel includes: Base; A plurality of sub-pixels are located on one side of the substrate; each of the plurality of sub-pixels includes at least one light-emitting device; the light-emitting device includes: a first electrode, a light-emitting functional layer, and a second electrode stacked on one side of the substrate; the plurality of sub-pixels includes: a plurality of first sub-pixels, a plurality of second sub-pixels, and a plurality of third sub-pixels; the first electrode of the first sub-pixel includes: a first reflective layer; the first electrode of the second sub-pixel and the first electrode of the third sub-pixel include: a second reflective layer; the reflectivity of the first reflective layer is greater than the reflectivity of the second reflective layer.

2. The display panel of claim 1, wherein, The thickness of the first reflective layer is not equal to the thickness of the second reflective layer.

3. The display panel according to claim 2, wherein, The distance between the surface of the first reflective layer away from the substrate and the surface of the second electrode facing the substrate is a first distance, and the distance between the surface of the second reflective layer away from the substrate and the surface of the second electrode facing the substrate is a second distance; The first distance is not equal to the second distance.

4. The display panel according to claim 3, wherein, The first sub-pixel emits light of the first color; the ratio of the first distance to the wavelength of the first color light is a positive integer.

5. The display panel according to any one of claims 1 to 4, wherein, The first electrode of the first sub-pixel further includes: a first contact layer located between the first reflective layer and the substrate, and a second contact layer located on the side of the first reflective layer facing away from the substrate; The first electrode of the second sub-pixel and the third sub-pixel further includes: a third contact layer located between the second reflective layer and the substrate, and a fourth contact layer located on the side of the second reflective layer away from the substrate; The first contact layer and the third contact layer have the same thickness.

6. The display panel according to claim 5, wherein, The first contact layer and the third contact layer are made of the same material and are disposed in the same layer.

7. The display panel according to claim 5 or 6, wherein, The thickness of the first reflective layer is greater than the thickness of the second reflective layer, and the thickness of the second contact layer is less than the thickness of the fourth contact layer; or... The thickness of the first reflective layer is less than the thickness of the second reflective layer, and the thickness of the second contact layer is greater than the thickness of the fourth contact layer.

8. The display panel according to any one of claims 5 to 7, wherein, Both the third contact layer and the fourth contact layer include: a first sub-contact layer that contacts the light-emitting functional layer; The first reflective layer and / or the second reflective layer are in direct contact with the first sub-contact layer.

9. The display panel according to any one of claims 5 to 7, wherein, Both the third contact layer and the fourth contact layer include: a first sub-contact layer that contacts the light-emitting functional layer; at least one of the first reflective layer and the second reflective layer does not directly contact the first sub-contact layer. The third contact layer and / or the fourth contact layer further include: a second sub-contact layer located on the side of the first sub-contact layer facing the substrate.

10. The display panel according to any one of claims 5 to 9, wherein, The first reflective layer is made of silver, and the second reflective layer is made of aluminum; The material of the first sub-contact layer includes indium tin oxide; The material of the second sub-contact layer includes titanium or titanium nitride; The first contact layer and the third contact layer include one of the following: titanium, titanium nitride, or a stack of titanium and titanium nitride.

11. The display panel according to any one of claims 1 to 10, wherein, The first electrode includes: a first surface and a second surface parallel to the plane of the substrate, and a first side surface connecting the first surface and the second surface; the second surface is located on the side of the first surface away from the substrate; the angle between the first side surface and the first surface is greater than 30° and less than 90°.

12. The display panel according to any one of claims 1 to 11, wherein, The first sub-pixel is a blue sub-pixel, the second sub-pixel is a red sub-pixel, and the third sub-pixel is a green sub-pixel.

13. A method for manufacturing a display panel, wherein, The method includes: Provide a base; A second reflective layer is formed on one side of the substrate; The second reflective layer is patterned to form a pattern in the area of ​​the second sub-pixel and the third sub-pixel. A first reflective layer is formed on the side of the second reflective layer that faces away from the substrate; the reflectivity of the first reflective layer is greater than the refractive index of the second reflective layer; The first reflective layer is patterned to form a pattern of the first reflective layer in the region of the first sub-pixel. A light-emitting functional layer and a second electrode are sequentially formed on the side of the first and second reflective layers away from the substrate.

14. The method according to claim 13, wherein, Before forming the second reflective layer on one side of the substrate, the method further includes: Forming the first metal contact layer; Before performing the patterning process on the second reflective layer, the process also includes: A fourth contact layer is formed on the side of the second reflective layer that is away from the substrate; The patterning process for the second reflective layer specifically includes: A patterning process is performed on the fourth contact layer and the second reflective layer to form patterns of the second reflective layer and the fourth contact layer in the regions of the second sub-pixel and the third sub-pixel; Before performing the patterning process on the first reflective layer, the method further includes: A second contact layer is formed on the side of the first reflective layer that is away from the substrate; The patterning process for the first reflective layer specifically includes: A patterning process is performed on the second contact layer, the first reflective layer, and the first metal contact layer to form a first electrode pattern including the third contact layer, the second reflective layer, and the fourth contact layer in the region of the second sub-pixel and the third sub-pixel, and to form a first electrode pattern including the first contact layer, the first reflective layer, and the second contact layer in the region of the first sub-pixel.

15. A display device, wherein, The display device includes a display panel according to any one of claims 1 to 12.

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