CN115347030A - Display panel and display device - Google Patents

Abstract

The application discloses display panel and display device relates to and shows technical field. The display panel comprises a plurality of sub-pixels and a light extraction layer, wherein each sub-pixel comprises an anode layer, a functional film layer and a cathode layer which are sequentially stacked. The plurality of sub-pixels includes at least a sub-pixel of a first color and a sub-pixel of a second color. Because the difference value of the distances between the surface of the functional film layer far away from the substrate and the substrate in any two sub-pixels is smaller than the difference threshold value, the flatness of the surface of the cathode layer formed in the region where the sub-pixels with different colors are located is better, the probability of fracture of the cathode layer is reduced, and the display effect of the display panel is improved. Meanwhile, the thickness of the first part corresponding to the sub-pixel of the first color in the light extraction layer is different from the thickness of the second part corresponding to the sub-pixel of the second color, so that the thickness of the light extraction layer can meet the optical gain characteristic of the corresponding sub-pixel, and the luminous efficiency of the sub-pixel in the display panel is ensured.

Description

Display panel and display device

technical field

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

Background technique

The display panel includes a base substrate and multiple sub-pixels of different colors located on the base substrate, each sub-pixel includes: an anode layer, a functional film layer and a cathode layer located on the base substrate and stacked in sequence.

In related technologies, sub-pixels of different colors have different optical gain characteristics at different wavelengths, so the thicknesses of the functional film layers of sub-pixels of different colors need to be designed differently to meet the luminous efficiency of sub-pixels of different colors. For example, the display panel includes red sub-pixels, green sub-pixels and blue sub-pixels, and the thickness of the functional film layer of the red sub-pixel is greater than the thickness of the functional film layer of the green sub-pixel, and the thickness of the functional film layer of the green sub-pixel is greater than that of the blue sub-pixel. The thickness of the functional film layer of the color sub-pixel.

However, since the functional film layers of sub-pixels of different colors have different thicknesses, the distances between the functional film layers of sub-pixels of different colors away from the base substrate and the base substrate are different, that is, the surface for setting the cathode layer is different. The poor flatness of the cathode layer is easy to cause the cathode layer to break, and the display effect of the display panel is poor.

Contents of the invention

The present application provides a display panel and a display device, which can solve the problem of poor display effect of the display panel caused by a broken cathode layer in the related art. Described technical scheme is as follows:

In one aspect, a display panel is provided, and the display panel includes:

Substrate substrate;

A plurality of sub-pixels located on one side of the base substrate, each of the sub-pixels includes an anode layer, a functional film layer and a cathode layer stacked in sequence, and the area where each of the sub-pixels is located forms a microcavity of the sub-pixel , the plurality of sub-pixels at least include sub-pixels of a first color and sub-pixels of a second color;

and a light extraction layer located on the side of the plurality of sub-pixels away from the base substrate, the light extraction layer at least includes a first part and a second part, and the orthographic projection of the first part on the base substrate is the same as The orthographic projection of the sub-pixels of the first color on the substrate at least partially overlaps, the orthographic projection of the second part on the substrate and the sub-pixel of the second color on the substrate the orthographic projections on the base substrate are at least partially overlapping;

Wherein, the difference in the distance between the functional film layers of any two of the sub-pixels in the plurality of sub-pixels away from the surface of the base substrate and the base substrate is less than a difference threshold, and the first part The thickness is different from the thickness of the second part.

Optionally, the length of the microcavity of the sub-pixel of the first color is greater than the length of the microcavity of the sub-pixel of the second color, and the thickness of the first part is greater than the thickness of the second part;

Wherein, for each of the sub-pixels, the microcavity length of the sub-pixel is used to indicate the distance between the surface of the anode layer in the sub-pixel that is away from the substrate and the surface of the sub-pixel that emits light.

Optionally, the plurality of sub-pixels further include sub-pixels of a third color, the light extraction layer further includes a third part, and the orthographic projection of the third part on the base substrate is the same as that of the third color. The orthographic projections of the sub-pixels on the base substrate at least partially overlap;

The thickness of the third portion is different from the thickness of the first portion and different from the thickness of the second portion.

Optionally, the length of the microcavity of the sub-pixel of the second color is greater than the length of the microcavity of the sub-pixel of the third color, and the thickness of the second part is greater than the thickness of the third part.

Optionally, the first color is red, the second color is green, and the third color is blue.

Optionally, the functional film layer includes: an electron injection layer, an electron transport layer, a light emitting layer, an optical adjustment layer, a hole transport layer and a hole injection layer stacked in sequence along a direction away from the base substrate.

Optionally, both the light-emitting layer and the optical adjustment layer in the functional film layers of the plurality of sub-pixels are patterned film layers;

Both the hole transport layer and the hole injection layer in the functional film layers of the plurality of sub-pixels are shared film layers;

Both the electron injection layer and the electron transport layer in the functional film layers of the multiple sub-pixels are patterned film layers, or the electron injection layer and the electron transport layer in the functional film layers of the multiple sub-pixels are both shared film layers;

Wherein, the patterned film layer includes a plurality of patterns arranged at intervals, and the orthographic projections of the plurality of patterns on the base substrate are located in the area where the plurality of sub-pixels are located, and are not located in the interval area of the plurality of sub-pixels, The orthographic projection of the common film layer on the base substrate is located in the region where the plurality of sub-pixels are located, and is located in the interval region of the plurality of sub-pixels.

Optionally, the functional film layer includes: a first electron injection layer, a first electron transport layer, a first light-emitting layer, a first optical adjustment layer, and a first hole A transport layer, a charge generation layer, a second electron injection layer, a second electron transport layer, a second light emitting layer, a second optical adjustment layer, a second hole transport layer, and a hole injection layer.

Optionally, the first light-emitting layer, the first optical adjustment layer, the charge generation layer, the second light-emitting layer and the second optical adjustment layer in the functional film layers of the plurality of sub-pixels are all patterned film layers;

The first hole transport layer, the second electron injection layer, the second electron transport layer, the second hole transport layer and the hole injection layer in the functional film layers of the plurality of sub-pixels are all common film layers;

Both the first electron injection layer and the first electron transport layer in the functional film layers of the multiple sub-pixels are patterned film layers, or the first electron injection layer and the first electron transport layer in the functional film layers of the multiple sub-pixels The transmission layer is a common film layer;

Wherein, the patterned film layer includes a plurality of patterns arranged at intervals, and the orthographic projections of the plurality of patterns on the base substrate are located in the area where the plurality of sub-pixels are located, and are not located in the interval area of the plurality of sub-pixels, The orthographic projection of the common film layer on the base substrate is located in the region where the plurality of sub-pixels are located, and is located in the interval region of the plurality of sub-pixels.

Optionally, the functional film layer includes: a hole injection layer, a hole transport layer, a first light-emitting layer, a second light-emitting layer, a first hole blocking layer, which are sequentially stacked in a direction away from the base substrate, A charge generation layer, a third light emitting layer, a second hole blocking layer, an electron transport layer, and an electron injection layer.

Optionally, the hole injection layer, the hole transport layer and the charge generation layer in the functional film layers of the plurality of sub-pixels are all patterned film layers;

The first light-emitting layer, the second light-emitting layer, the first hole blocking layer, the third light-emitting layer, the second hole blocking layer, the electron transport layer and the electron injection layer in the functional film layers of the plurality of sub-pixels are all shared film layer;

Wherein, the patterned film layer includes a plurality of patterns arranged at intervals, and the orthographic projections of the plurality of patterns on the base substrate are located in the area where the plurality of sub-pixels are located, and are not located in the interval area of the plurality of sub-pixels, The orthographic projection of the common film layer on the base substrate is located in the region where the plurality of sub-pixels are located, and is located in the interval region of the plurality of sub-pixels.

Optionally, the display panel further includes: a color filter layer, the color filter layer is located on a side of the plurality of sub-pixels away from the base substrate;

The color filter layer includes a plurality of color-resist blocks of different colors, and the area where each sub-pixel is located is located within an orthographic projection of the color-resist block on the base substrate.

Optionally, the material of the cathode layer is indium zinc oxide.

Optionally, the display panel is a silicon-based display panel.

In another aspect, a display device is provided, and the display device includes: a power supply component and the display panel as described in the above aspect;

The power supply component is used to supply power to the display panel.

The beneficial effects brought by the technical solution provided by the application at least include:

The present application provides a display panel and a display device. The display panel includes a plurality of sub-pixels and a light extraction layer, and each sub-pixel includes an anode layer, a functional film layer and a cathode layer stacked in sequence. The plurality of sub-pixels includes at least sub-pixels of a first color and sub-pixels of a second color. Since the difference between the distance between the surface of the functional film layer far away from the base substrate and the base substrate in any two sub-pixels is less than the difference threshold, the flatness of the surface where the cathode layer is formed in the sub-pixels of different colors can be made relatively high. Well, the probability of breaking the cathode layer is reduced, and the display effect of the display panel is improved. At the same time, the thickness of the first part corresponding to the sub-pixel of the first color in the light extraction layer and the thickness of the second part corresponding to the sub-pixel of the second color are different, so that the thickness of the light extraction layer can meet the optical gain of the corresponding sub-pixel characteristics to ensure the luminous efficiency of the sub-pixels in the display panel.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a schematic structural diagram of a display panel in the related art;

FIG. 2 is a schematic structural diagram of a display panel provided by an embodiment of the present application;

FIG. 3 is a schematic structural diagram of another display panel provided by an embodiment of the present application;

FIG. 4 is a schematic structural diagram of another display panel provided by an embodiment of the present application;

Fig. 5 is a schematic structural diagram of another display panel provided by the embodiment of the present application;

FIG. 6 is a schematic structural diagram of another display panel provided by an embodiment of the present application;

FIG. 7 is a schematic structural diagram of a display device provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solution and advantages of the present application clearer, the implementation manners of the present application will be further described in detail below in conjunction with the accompanying drawings.

In recent years, virtual reality (virtual reality, VR) devices and augmented reality (augmented reality, AR) devices have been attracting market attention. At present, the shipments of head-mounted devices (or wearable display devices) are relatively large, with a three-year compound growth rate of 96%. Both current smartphones and televisions may eventually be replaced by more ergonomic devices in the form of smart glasses, or headsets, that allow the digital and analog worlds to coexist in harmony. Organic light-emitting diode (OLED) display panels have always been a key component in the development of VR devices and AR devices. The existing mainstream VR devices and AR devices use silicon-based OLED (si-OLED) display panels. The display panel is a display panel formed by directly preparing OLEDs on a silicon base. The pixel density (pixels per inch, PPI) of the pixels in the si-OLED display panel is higher, and the pixel size is smaller. At present, the relatively mature mass production technology of si-OLED display panels is to use a combination of white light-emitting diodes (WOLED) and color filter layers (colorfilter, CF) to achieve colored display effects. Although the existing si-OLED display panels with pixel density can already meet the display requirements of some VR devices, the PPI and brightness levels of the existing micro OLED display panels are still low, which cannot meet the requirements of AR devices and relatively high-end VR devices. need. However, the existing si-OLED display panel (WOLED+CF) has a large loss of light efficiency and a low color gamut, resulting in poor display effect.

Compared with the si-OLED display panel (WOLED+CF), if the si-OLED display panel directly patterns the light-emitting layer of the sub-pixel (for example, using a mask plate for patterned evaporation), it is theoretically possible Obtain higher device efficiency and ultra-high color gamut performance. Compared with the traditional si-OLED display panel (WOLED+CF), the display brightness of this design product can be increased by more than 20 times. Under the condition that the display panel is under the same driving condition, the power consumption can be effectively reduced, and the problem of screen burn-in can be improved. At the same time, this design product can solve the display brightness and PPI problems of the existing micro OLED display panel, and the product has higher brightness and resolution, can overcome or offset the limitation of optical devices, and realize the original unimaginable goal.

Generally, OLED display panels (patterned design of the light-emitting layer) can theoretically meet the requirements of high efficiency and high color gamut, such as low temperature polysilicon (LTPS) OLED display panels used in mass production of mobile phones. However, unlike OLED display panels with glass substrates or flexible substrates, the sub-pixels in high-PPI (PPI>3000) si-OLED display panels are nearly semiconductor-level in size, about 5×5μm ² (square micrometers) or even larger. Small, and the distance between the light-emitting regions of the sub-pixels is less than 2 μm (micrometer). The characteristics of these si-OLED display panels bring new problems and higher requirements and challenges to the preparation of si-OLED display panels (patterned design of the light-emitting layer).

For si-OLED display panels (patterning the light-emitting layer), it is necessary to use a mask with a large aspect ratio to pattern the light-emitting layer and the optical adjustment (prime) layer of the ultra-small sub-pixel. ) for preparation (a mask with a large aspect ratio is used to indicate that the ratio of the depth of the opening used to form a pattern in the mask to the width of the opening is relatively large). The mask with a large aspect ratio has a certain collimation effect on the evaporation pattern when patterning the evaporation. This can meet the precision requirements of the vapor deposition pattern formed in the si-OLED display panel, and the size of the patterned shadow (shadow) of the light emitting layer of the sub-pixel and the prime layer must be strictly controlled to be less than 1 μm to 2 μm. That is, unlike the fine metal mask (FMM) technology used to prepare the light-emitting layer in the traditional OLED display panel, the mask used for the patterned film layer in the si-OLED display panel needs to have a large depth. aspect ratio. In the preparation of the si-OLED display panel, not only the patterning of the emission layer (EML) but also the patterning of the prime layer needs to be completed through the mask (large aspect ratio). However, the part of the mask with a large aspect ratio located at the opening is prone to material accumulation during the evaporation process, which leads to the distortion of the formed pattern. That is to say, this kind of mask not only has a short service life, but also affects the yield of sub-pixels.

At present, the OLED device in the OLED display panel adopts the cavity length of the gain optical cavity (also called the microcavity length) of the second node with higher efficiency, and the optical cavity length of the sub-pixels of different colors under the second node Therefore, the thickness of the film layer in sub-pixels of different colors varies greatly. For example, referring to FIG. 1 , the optical cavity length of the red sub-pixel is greater than that of the green sub-pixel, and the optical cavity length of the green sub-pixel is greater than that of the blue sub-pixel. Therefore, the thickness of the film layer in the red sub-pixel is greater than the thickness of the film layer in the green sub-pixel, and the thickness of the film layer in the green sub-pixel is greater than the thickness of the film layer in the blue sub-pixel, such as the film layer in the red sub-pixel is thicker than the green sub-pixel The thickness of the film layer in the sub-pixel is about 50nm (nanometer), which is about 90nm thicker than that in the blue sub-pixel.

However, in the si-OLED display panel, due to the small size of the sub-pixels and the small distance between the light-emitting regions of the sub-pixels, the pixel defining layer (PDL) used to isolate the light-emitting regions of adjacent sub-pixels ) has a larger partition edge angle. Furthermore, if the thickness of the film layers in sub-pixels of different colors is greatly different, it is easy to cause partial virtual connection or breakage of the cathode layer shared by all sub-pixels in the display panel, which seriously reduces the display efficiency and display effect of the display panel.

In addition, the film layer between the light-emitting layer and the anode layer of the sub-pixel is more likely to cause electrical crosstalk between multiple sub-pixels than the film layer on the side of the light-emitting layer away from the anode layer. In Figure 1, due to the high carrier mobility of the hole injection layer (HIL) and the hole transport layer (HTL) between the light emitting layer and the anode layer of the sub-pixel, the sub-pixel Carriers in the sub-pixel may be transported to the sub-pixel adjacent to the sub-pixel, resulting in a large lateral current, and electrical crosstalk between multiple sub-pixels, affecting the display effect of the display device (for example, affecting the color gamut).

FIG. 2 is a schematic structural diagram of a display panel provided by an embodiment of the present application. Referring to FIG. 2, it can be seen that the display panel 10 may include: a base substrate 101, a plurality of sub-pixels 102 located on one side of the base substrate 101, and a light extraction unit located on a side of the plurality of sub-pixels 102 away from the base substrate 101. Layer (capping layer, CPL) 103 .

Referring to FIG. 2 , each sub-pixel 102 may include an anode layer 1021 , a functional film layer 1022 and a cathode layer 1023 stacked in sequence. The cathode layer 1023 of the multiple sub-pixels 102 in the display panel 10 may be a common film layer. The common film layer can be used to indicate that its orthographic projection on the base substrate 101 is located in the area where the multiple sub-pixels 102 are located, and is located in the interval area between the multiple sub-pixels 102 . The common film layer may be a common film layer that is not patterned with a mask. Wherein, the functional film layer in Fig. 2 takes the shared film layer as an example, in fact, the functional film layer 1022 may include multiple film layers, and some film layers in the multiple film layers may be shared film layers, and the other part film layers may not be shared film.

The plurality of sub-pixels 102 includes at least a sub-pixel 102a of a first color and a sub-pixel 102b of a second color. The light extraction layer 103 includes at least a first portion 1031 and a second portion 1032, the orthographic projection of the first portion 1031 on the base substrate 101 at least partially overlaps the orthographic projection of the sub-pixel 102a of the first color on the base substrate 101 (the first portion 1031 corresponds to the sub-pixel 102a of the first color), the orthographic projection of the second part 1032 on the substrate 101 overlaps at least partially the orthographic projection of the sub-pixel 102b of the second color on the substrate 101 (the second part 1032 corresponds to the sub-pixel 102b of the second color). That is, the light emitted by the sub-pixels 102a of the first color can be emitted from the first portion 1031 of the light extraction layer 103 , and the light emitted by the sub-pixels 102b of the second color can be emitted from the second portion 1032 of the light extraction layer 103 .

In the embodiment of the present application, the difference in the distance between the functional film layer 1022 of any two sub-pixels 102 in the plurality of sub-pixels 102 and the distance between the surface of the base substrate 101 and the base substrate 101 is smaller than the difference threshold. The difference threshold can be as small as possible under the premise of ensuring the uniformity of the lifetime of the sub-pixels 102 of different colors. For example, the difference threshold may be 10 nm (nanometer).

Optionally, the functional film layer 1022 in the sub-pixel 102a of the first color is away from the distance between the surface of the base substrate 101 and the base substrate 101, and the functional film layer 1022 in the sub-pixel 102b of the second color is far away from the base substrate The difference in distance between the surface of 101 and the base substrate 101 is smaller than the difference threshold. That is, the distance between the functional film layer 1022 in the sub-pixel 102a of the first color and the surface of the base substrate 101 away from the base substrate 101, and the functional film layer 1022 in the sub-pixel 102b of the second color are far away from the base substrate The distance difference between the surface of 101 and the base substrate 101 may be small, that is, the two may be approximately equal. Therefore, the surface for forming the cathode layer 1023 in the sub-pixel 102a of the first color and the surface for forming the cathode layer 1023 in the sub-pixel 102b of the second color can be approximately coplanar. Furthermore, the flatness of the surface on which the cathode layer 1023 is formed can be improved, the probability of breaking the cathode layer 1023 can be reduced, and the display effect of the display panel 10 can be ensured.

At the same time, the thickness of the first part 1031 of the light extraction layer 103 is different from the thickness of the second part 1032 of the light extraction layer 103, that is, the length of the microcavity of the subpixel 102a of the first color is different from the length of the microcavity of the subpixel 102b of the second color. Different lengths. Further, the thickness of the first part 1031 can be made to meet the optical gain characteristics of the sub-pixels 102a of the first color, and the thickness of the second part 1032 can be made to meet the optical gain characteristics of the sub-pixels 102b of the second color, while ensuring that the display panel 10 The luminous efficiency of the sub-pixel 102a of the first color and the sub-pixel 102b of the second color.

Wherein, the area where each sub-pixel 102 is located forms a microcavity of the sub-pixel 102, and each sub-pixel 102 can emit light efficiently under the action of its microcavity. For each sub-pixel 102 , the microcavity length of the sub-pixel 102 may be used to represent the distance between the surface of the anode layer 1021 in the sub-pixel 102 away from the substrate 101 and the surface of the sub-pixel 102 emitting light. In the embodiment of the present application, the light emitted by the sub-pixel 102 can be emitted from the surface of the light extraction layer 103 away from the base substrate 101 , so the surface of the light extraction layer 103 away from the base substrate 101 can be the surface from which the sub-pixel 102 emits light. Thus, the microcavity length of the sub-pixel 102a of the first color can be used to indicate that the anode layer 1021 of the sub-pixel 102a of the first color is away from the surface of the base substrate 101 and the first part 1031 of the light extraction layer 103 is away from the base substrate 101 distance between the surfaces. The microcavity length of the sub-pixel 102b of the second color can be used to indicate that the anode layer 1021 of the sub-pixel 102b of the second color is away from the surface of the base substrate 101 and the second part 1032 of the light extraction layer 103 is away from the surface of the base substrate 101. distance between surfaces.

That is to say, the display panel 10 provided by the embodiment of the present application can reduce the probability of breaking the cathode layer 1023 on the premise of satisfying the optical gain characteristics of the sub-pixels 102 of different colors, and ensure the luminous efficiency of the sub-pixels 102 in the display panel 10 And the display effect of the display panel 10 .

To sum up, the embodiment of the present application provides a display panel, which includes a plurality of sub-pixels and a light extraction layer, and each sub-pixel includes an anode layer, a functional film layer and a cathode layer stacked in sequence. The plurality of sub-pixels includes at least sub-pixels of a first color and sub-pixels of a second color. Since the difference between the distance between the surface of the functional film layer far away from the base substrate and the base substrate in any two sub-pixels is less than the difference threshold, the flatness of the surface where the cathode layer is formed in the sub-pixels of different colors can be made relatively high. Well, the probability of breaking the cathode layer is reduced, and the display effect of the display panel is improved. At the same time, the thickness of the first part corresponding to the sub-pixel of the first color in the light extraction layer and the thickness of the second part corresponding to the sub-pixel of the second color are different, so that the thickness of the light extraction layer can meet the optical gain of the corresponding sub-pixel characteristics to ensure the luminous efficiency of the sub-pixels in the display panel.

Optionally, the display panel 10 may be a silicon-based display panel. The display panel 10 can be applied in AR equipment or VR equipment.

Optionally, the length of the microcavity of the sub-pixel 102a of the first color may be greater than the length of the microcavity of the sub-pixel 102b of the second color. That is, the distance between the surface of the anode layer 1021 close to the base substrate 101 and the surface of the first part 1031 of the light extraction layer 103 away from the base substrate 101 in the sub-pixel 102a of the first color is greater than that of the sub-pixel of the second color 102b is the distance between the surface of the anode layer 1021 close to the base substrate 101 and the surface of the second part 1032 of the light extraction layer 103 away from the base substrate 101 . Therefore, the thickness of the first portion 1031 of the light extraction layer 103 corresponding to the sub-pixel 102a of the first color may be greater than the thickness of the second portion 1032 of the light extraction layer 103 corresponding to the sub-pixel 102b of the second color.

Referring to FIG. 3, the plurality of sub-pixels 102 may further include a sub-pixel 102c of a third color. The light extraction layer 103 may further include a third portion 1033. The orthographic projection of the third portion 1033 on the base substrate 101 at least partially overlaps the orthographic projection of the sub-pixel 102c of the third color on the base substrate 101 (the third portion 1033 corresponds to the sub-pixel 102c of the third color). That is, the light emitted by the sub-pixel 102c of the third color can be emitted from the third portion 1033 of the light extraction layer 103 .

Since the difference in the distance between the functional film layers 1022 of any two subpixels 102 in the plurality of subpixels 102 away from the surface of the base substrate 101 and the distance between the base substrate 101 is less than the difference threshold, the function in the subpixel 102c of the third color The distance between the surface of the film layer 1022 away from the base substrate 101 and the base substrate 101 may be the same as the distance between the surface of the functional film layer 1022 away from the base substrate 101 and the base substrate 101 in the sub-pixel 102a of the first color And the difference of the distance between the surface of the functional film layer 1022 away from the base substrate 101 and the base substrate 101 in the sub-pixel 102b of the second color is smaller than the difference threshold. That is, the surface of the cathode layer 1023 is formed in the sub-pixel 102a of the first color, the surface of the cathode layer 1023 is formed in the sub-pixel 102b of the second color, and the surface of the cathode layer 1023 is formed in the sub-pixel 102c of the third color. The surfaces of layer 1023 are approximately coplanar. Thus, the flatness of the surface of the formed cathode layer 1023 (common film layer) can be improved, the probability of breaking the cathode layer 1023 can be reduced, and the display effect of the display panel 10 can be ensured.

Meanwhile, the thickness of the third portion 1033 of the light extraction layer 103 may be different from the thickness of the first portion 1031 of the light extraction layer 103 and different from the thickness of the second portion 1032 of the light extraction layer 103 . Thus, the length of the microcavity of the sub-pixel 102c of the third color is different from the length of the microcavity of the sub-pixel 102a of the first color and the length of the microcavity of the sub-pixel 102b of the second color. Further, the thickness of the third portion 1033 can meet the optical gain characteristics of the sub-pixel 102c of the third color, so as to ensure the luminous efficiency of the sub-pixel 102c of the third color in the display panel 10 .

Optionally, the length of the microcavity of the sub-pixel 102b of the second color may be greater than the length of the microcavity of the sub-pixel 102c of the third color. That is, the distance between the surface of the anode layer 1021 close to the base substrate 101 in the sub-pixel 102b of the second color and the surface of the second part 1032 of the light extraction layer 103 away from the base substrate 101 is larger than that of the sub-pixels of the third color. The distance between the surface of the anode layer 1021 close to the base substrate 101 and the surface of the third part 1033 of the light extraction layer 103 away from the base substrate 101 in the pixel 102c. Therefore, the thickness of the second portion 1032 of the light extraction layer 103 corresponding to the sub-pixel 102b of the second color may be greater than the thickness of the third portion 1033 of the light extraction layer 103 corresponding to the sub-pixel 102c of the third color.

In the embodiment of the present application, the plurality of sub-pixels 102 of the display panel 10 may include red (red, R) sub-pixels, green (green, G) sub-pixels and blue (blue, B) sub-pixels. Wherein, in order to meet the optical gain characteristics of the sub-pixels 102 of various colors, it is necessary to make the microcavity length of the red sub-pixel 102 longer than the microcavity length of the green sub-pixel 102, and make the microcavity length of the green sub-pixel longer than the blue sub-pixel microcavity length. Thus, the first color in the embodiment of the present application can be made red (the sub-pixel 102a of the first color is a red sub-pixel), the second color is green (the sub-pixel 102b of the second color is a green sub-pixel), and the second color is green (the sub-pixel 102b of the second color is a green sub-pixel). The third color is blue (the sub-pixel 102c of the third color is a blue sub-pixel).

Referring to FIG. 3, the functional film layer 1022 may include: an electron injection layer (electron injection layer, EIL) 10221a, an electron transport layer (electron transport layer, ETL) 10222a, a light emitting layer 10223a, Optical adjustment layer 10224a, hole transport layer 10225a and hole injection layer 10226a.

Referring to FIG. 3 , the light emitting layer 10223 a and the optical adjustment layer 10224 a in the functional film layer 1022 of the plurality of sub-pixels 102 are both patterned film layers. The electron injection layer 10221a, the electron transport layer 10222a, the hole transport layer 10225a and the hole injection layer 10226a in the functional film layers 1022 of the multiple sub-pixels 102 are all common film layers.

Wherein, the patterned film layer includes multiple patterns arranged at intervals, and the orthographic projections of the multiple patterns on the base substrate 101 are located in the area where the multiple sub-pixels 102 are located, and not located in the interval area between the multiple sub-pixels 102 . For example, the number of patterns included in the patterned film layer may be the same as the number of sub-pixels 102 , and each pattern is located in a region where a sub-pixel 102 is located. The patterned film layer may be a non-common film layer that is patterned by a mask.

The material of the light-emitting layer 10223a of the sub-pixel 102a of the first color can be a red light-emitting material (the light-emitting layer 10223a of the sub-pixel 102a of the first color can be a red light-emitting material layer), and the material of the light-emitting layer 10223a of the sub-pixel 102b of the second color can be a red light-emitting material layer. The material can be a green light-emitting material (the light-emitting layer 10223a of the sub-pixel 102b of the second color can be a green light-emitting material layer), and the material of the light-emitting layer 10223a of the sub-pixel 102c of the third color can be a blue light-emitting material (the light-emitting layer of the third color The light emitting layer 10223a of the sub-pixel 102c may be a blue light emitting material layer). In this way, the display panel 10 can emit light of various colors, and the color gamut of the display panel 10 is relatively high.

Usually, the carrier mobility of the electron injection layer 10221a and the electron transport layer 10222a is smaller than the carrier mobility of the hole injection layer 10226a and the hole transport layer 10225a. In the display panel 10, the electron injection layer 10221a and the electron transport layer 10222a are designed closer to the anode layer 1021 relative to the hole injection layer 10226a and the hole transport layer 10225a, and the light emitting layer 10223a is designed closer to the anode layer 1021 relative to the optical adjustment layer 10224a, which can be The lateral leakage between the sub-pixels 102 is reduced, the probability of electrical crosstalk between the sub-pixels 102 is effectively reduced, and the color gamut and contrast of the display panel are greatly improved.

In the display panel 10 shown in FIG. 3 , the light emitting layer 10223a and the optical adjustment layer 10224a in the functional film layer 1022 of the sub-pixel 102 are patterned. The thicknesses of the light-emitting layers 10223a of the sub-pixels 102 of different colors can be consistent, for example, they can all be 30nm (nanometers), or the thicknesses of the light-emitting layers 10223a of the sub-pixels 102 of different colors can be allowed according to the life requirements of the sub-pixels 102 of different colors. Certain thickness difference (difference less than 10nm). The optical adjustment layer 10224a of the sub-pixels 102 of different colors only needs to meet the function of electrically blocking carriers and not require it to participate in the function of optical adjustment, so the thickness of the optical adjustment layer 10224a can range from 5nm to 10nm. Thus, the thickness of the film layer to be patterned in the display panel 10 shown in FIG. 3 can be uniformly 35nm±10nm. That is, the difference in film thickness of the display panel 10 as a whole can be made as small as possible, so that the flatness of the surface forming the cathode layer 1023 is better, and the probability of breaking the cathode layer 1023 is reduced, which is of great importance for high-PPI display technologies. crucial impact.

FIG. 4 is a schematic structural diagram of another display panel provided by an embodiment of the present application. Referring to FIG. 4, it can be seen that the electron injection layer 10221a and the electron transport layer 10222a of the plurality of sub-pixels 102 may be patterned film layers. Therefore, compared with the display panel 10 shown in FIG. 3 , the display panel 10 shown in FIG. 4 can better block the lateral transport of carriers and avoid horizontal electrical crosstalk between the multiple sub-pixels 102 .

In the display panel 10 shown in FIG. 4 , the electron injection layer 10221a, the electron transport layer 10222a, the light emitting layer 10223a, and the optical adjustment layer 10224a in the functional film layer 1022 of the sub-pixel 102 are patterned. The total thickness of the electron injection layer 10221a and the electron transport layer 10222a of the sub-pixels 102 of different colors can be kept consistent, for example, less than 35nm. The total thickness of the electron injection layer 10221a and the electron transport layer 10222a can be adjusted based on the film material and the thickness of the anode layer 1021. The thickness of the light-emitting layer 10223a of the sub-pixels 102 of different colors can be kept the same, for example, they can all be 30nm, or the thickness of the light-emitting layer 10223a of the sub-pixels 102 of different colors can allow a certain difference in thickness according to the service life requirements of the sub-pixels 102 of different colors (difference less than 10nm). The optical adjustment layer 10224a of the sub-pixels 102 of different colors only needs to meet the function of electrically blocking the carriers but does not require it to participate in the optical adjustment function, so the thickness of the optical adjustment layer 10224a can range from 5nm to 10nm. Therefore, the thickness of the film layer to be patterned in the display panel 10 shown in FIG. 4 can be uniformly 70nm±10nm.

That is to say, compared with the display panel 10 shown in FIG. 3 , the display panel 10 shown in FIG. 4 can completely block the lateral transport of carriers, but the overall film thickness of the display panel 10 has a large difference. In the embodiment of the present application, when designing the electron injection layer 10221 a and the electron transport layer 10222 a of the display panel 10 , the specific design can be performed comprehensively considering the difference in lateral leakage and film thickness.

In the display panel 10 shown in FIG. 3 and FIG. 4, the sub-pixel 102a of the first color may include: an anode layer 1021, an electron injection layer (EIL) 10221a, an electron transport layer (ETL) 10222a, and a red light-emitting material stacked in sequence. Layer (R-EML) 10223a, red optical adjustment layer (R-prime) 10224a, hole transport layer (HTL) 10225a, hole injection layer (HIL) 10226a, cathode layer 1023 and first part 1031 of light extraction layer 103 . The sub-pixel 102b of the second color may include: an anode layer 1021 stacked in sequence, an electron injection layer (EIL) 10221a, an electron transport layer (ETL) 10222a, a green light-emitting material layer (G-EML) 10223a, a green optical adjustment layer ( G-prime) 10224a, a hole transport layer (HTL) 10225a, a hole injection layer (HIL) 10226a, a cathode layer 1023 and a second portion 1032 of the light extraction layer 103. The sub-pixel 102c of the third color may include: an anode layer 1021 stacked in sequence, an electron injection layer (EIL) 10221a, an electron transport layer (ETL) 10222a, a blue light-emitting material layer (B-EML) 10223a, and a red optical adjustment layer (B-prime) 10224a, hole transport layer (HTL) 10225a, hole injection layer (HIL) 10226a, cathode layer 1023 and third portion 1033 of light extraction layer 103 .

FIG. 5 is a schematic structural diagram of another display panel provided by an embodiment of the present application. Referring to FIG. 5, it can be seen that the functional film layer 1022 may include: a first electron injection layer 10221b, a first electron transport layer 10222b, a first light-emitting layer 10223b, and a first optical adjustment layer sequentially stacked along a direction away from the substrate 101. layer 10224b, first hole transport layer 10225b, charge generation layer (charge generate layer, CGL) 10226b, second electron injection layer 10227b, second electron transport layer 10228b, second light emitting layer 10229b, second optical adjustment layer 102210b, The second hole transport layer 102211b and the hole injection layer 102212b. That is, the sub-pixels 102 in the display panel 10 shown in FIG. 5 may have a stacked structure.

Referring to FIG. 5, the first electron injection layer 10221b, the first electron transport layer 10222b, the first light emitting layer 10223b, the first optical adjustment layer 10224b, the charge generation layer 10226b, and the second light emitting layer in the functional film layer 1022 of a plurality of sub-pixels 102 Both the layer 10229b and the second optical adjustment layer 102210b are patterned film layers. The first hole transport layer 10225b, the second electron injection layer 10227b, the second electron transport layer 10228b, the second hole transport layer 102211b and the hole injection layer 102212b in the functional film layer 1022 of the plurality of sub-pixels 102 are all shared films Floor.

Of course, in order to completely block the lateral transport of carriers, the first electron injection layer 10221b and the first electron transport layer 10222b may be patterned film layers. This embodiment of the present application does not limit it.

In the display panel shown in FIG. 5 , the sub-pixel 102a of the first color may include: an anode layer 1021 stacked in sequence, a first electron injection layer (EIL) 10221b, a first electron transport layer (ETL) 10222b, a red light-emitting material layer (R-EML) 10223b, red optical adjustment layer (R-prime) 10224b, first hole transport layer (HTL) 10225b, charge generation layer (CGL) 10226b, second electron injection layer (EIL) 10227b, second Two electron transport layer (ETL) 10228b, red light-emitting material layer (R-EML) 10229b, red optical adjustment layer (R-prime) 102210b, second hole transport layer (HTL) 102211b, hole injection layer 102212b, cathode layer 1023 and the first portion 1031 of the light extraction layer 103 . The sub-pixel 102b of the second color may include: an anode layer 1021 stacked in sequence, a first electron injection layer (EIL) 10221b, a first electron transport layer (ETL) 10222b, a green light-emitting material layer (G-EML) 10223b, a green Optical adjustment layer (G-prime) 10224b, first hole transport layer (HTL) 10225b, charge generation layer (CGL) 10226b, second electron injection layer (EIL) 10227b, second electron transport layer (ETL) 10228b, green The light emitting material layer (R-EML) 10229b, the green optical adjustment layer (R-prime) 102210b, the second hole transport layer (HTL) 102211b, the hole injection layer 102212b, the cathode layer 1023 and the second light extraction layer 103 Section 1032. The sub-pixel 102c of the third color may include: an anode layer 1021 stacked in sequence, a first electron injection layer (EIL) 10221b, a first electron transport layer (ETL) 10222b, a blue light-emitting material layer (B-EML) 10223b, a blue Colored optical adjustment layer (B-prime) 10224a, first hole transport layer (HTL) 10225b, charge generation layer (CGL) 10226b, second electron injection layer (EIL) 10227b, second electron transport layer (ETL) 10228b , blue light emitting material layer (B-EML) 10229b, blue optical adjustment layer (B-prime) 102210b, second hole transport layer (HTL) 102211b, hole injection layer 102212b, cathode layer 1023 and light extraction layer 103 of the third part 1033 .

FIG. 6 is a schematic structural diagram of another display panel provided by an embodiment of the present application. Referring to FIG. 6, the functional film layer 1022 may include: a hole injection layer 10221c, a hole transport layer 10222c, a first light-emitting layer 10223c, a second light-emitting layer 10224c, a first hole A blocking layer (hole block layer, HBL) 10225c, a charge generation layer 10226c, a third light emitting layer 10227c, a second hole blocking layer 10228c, an electron transport layer 10229c and an electron injection layer 102210c.

Referring to FIG. 6 , the hole injection layer 10221c, the hole transport layer 10222c and the charge generation layer 10226c in the functional film layer 1022 of the plurality of sub-pixels 102 are patterned film layers. The first light emitting layer 10223c, the second light emitting layer 10224c, the first hole blocking layer 10225c, the third light emitting layer 10227c, the second hole blocking layer 10228c, the electron transport layer 10229c and The electron injection layer 102210c is a common film layer.

Since the hole injection layer 10221c, the hole transport layer 10222c and the charge generation layer 10226c are all patterned film layers, they can completely block the lateral transport of carriers.

Optionally, in the display panel 10 shown in FIG. 6 , the hole injection layer 10221c can exchange positions with the electron injection layer 102210c, and the hole transport layer 10222c can exchange positions with the electron transport layer 10229c. In this case, since the carrier mobility of the electron injection layer 102210c and the electron transport layer 10229c is smaller than that of the hole injection layer 10221c and the hole transport layer 10222c, in order to reduce the overall film thickness of the display panel 10 as much as possible The difference can make the electron injection layer 102210c and the electron transport layer 10229c a common film layer. Of course, the electron injection layer 102210c and the electron transport layer 10229c can be patterned film layers to completely block the lateral transport of carriers. This embodiment of the present application does not limit it.

In the embodiment of the present application, the light emitted by the first light emitting layer 10223c, the light emitted by the second light emitting layer 10224c and the light emitted by the third light emitting layer 10227c may be mixed to produce white light. For example, the first light-emitting layer 10223c can be made of red phosphorescent material, and the color of the light emitted by the first light-emitting layer 10223c can be red. The second light emitting layer 10224c can be made of green phosphorescent material, and the color of the light emitted by the second light emitting layer 10224c can be green. The third light emitting layer 10227c can be made of blue fluorescent material, and the color of the light emitted by the third light emitting layer 10227c can be blue.

The light emitted by the sub-pixels 102 in the display panel 10 shown in FIG. 6 after passing through the cathode layer 1023 is white light. Moreover, the colors of light that can pass through the light extraction layer 103 with different thicknesses are different. For example, the color of light that can pass through the first part 1031 is red, and the color of light that can pass through the second part 1032 is green. , the color of the light that can pass through the third part 1033 is blue.

Referring to FIG. 6 , it can be seen that the display panel 10 may further include: a color filter layer 104 . The color filter layer 104 may be located on a side of the plurality of sub-pixels 102 away from the base substrate 101 . The color filter layer 104 may include a plurality of color-resist blocks 1041 of different colors, and the area where each sub-pixel 102 is located is within the orthographic projection of one color-resist block 1041 on the base substrate 101 .

For example, three sub-pixels 102 and three color-resisting blocks 1041 are shown in FIG. The color of the resistance block 1041 may be green, and the color of the color resistance block 1041 corresponding to the sub-pixel 102c of the third color may be blue.

By arranging the color filter layer 104 on the side of the sub-pixel 102 away from the base substrate 101, the light passing through the light extraction layer 103 can pass through the color-resist blocks 1041 of different colors in the color filter layer 104, thereby improving the display of the display panel 10. Effect.

In the display panel 10 shown in FIG. 6, the sub-pixel 102a of the first color may include: an anode layer 1021, a hole injection layer (HIL) 10221c, a hole transport layer (HTL) 10222c, and a red light-emitting material layer stacked in sequence. (R-EML) 10223c, green luminescent material layer (G-EML) 10224c, first hole blocking layer (HBL) 10225c, charge generation layer (CGL) 10226c, blue luminescent material layer (B-EML) 10227c, the first Two hole blocking layer (HBL) 10228c, electron transport layer (ETL) 10229c, electron injection layer (EIL) 102210c, cathode layer 1023 and first part 1031 of light extraction layer 103 . The sub-pixel 102b of the second color may include: an anode layer 1021, a hole injection layer (HIL) 10221c, a hole transport layer (HTL) 10222c, a red light-emitting material layer (R-EML) 10223c, and a green light-emitting material layer stacked in sequence. (G-EML) 10224c, first hole blocking layer (HBL) 10225c, charge generating layer (CGL) 10226c, blue light emitting material layer (B-EML) 10227c, second hole blocking layer (HBL) 10228c, electron The transport layer (ETL) 10229c, the electron injection layer (EIL) 102210c, the cathode layer 1023 and the second portion 1032 of the light extraction layer 103. The sub-pixel 102c of the third color may include: an anode layer 1021, a hole injection layer (HIL) 10221c, a hole transport layer (HTL) 10222c, a red light-emitting material layer (R-EML) 10223c, and a green light-emitting material layer stacked in sequence. (G-EML) 10224c, first hole blocking layer (HBL) 10225c, charge generating layer (CGL) 10226c, blue light emitting material layer (B-EML) 10227c, second hole blocking layer (HBL) 10228c, electron The transport layer (ETL) 10229c, the electron injection layer (EIL) 102210c, the cathode layer 1023 and the third part 1033 of the light extraction layer 103.

In the embodiment of the present application, the material of the anode layer 1021 of the sub-pixel 102 may be indium tin oxide (ITO). The material of the cathode layer 1023 of the sub-pixel 102 may be a metal material with high transmittance, such as magnesium-silver alloy (Mg—Ag) or indium zinc oxide (IZO). Wherein, the indium zinc oxide has better encapsulation and continuity, which can further prevent the cathode layer 1023 from breaking and ensure the yield rate of the display panel.

Referring to FIGS. 3 to 6 , it can be seen that the display panel 10 may further include a thin-film capsulation (TFE) 105 . The packaging film layer 105 can be located on the side of the light extraction layer 103 away from the base substrate 101. The packaging film layer 105 may include: a first film layer, a second film layer and a third film layer stacked along a direction away from the base substrate 101 .

Optionally, the first film layer and the third film layer may be made of inorganic materials, and the second film layer may be made of organic materials. For example, the first film layer and the third film layer may be made of one or more inorganic oxides such as SiNx, SiOx and SiOxNy. The second film layer may be made of resin material. The resin may be a thermoplastic resin or a thermoplastic resin, the thermoplastic resin may include acrylic (PMMA) resin, and the thermosetting resin may include epoxy resin.

In the embodiment of the present application, the second film layer can be made by ink jet printing (ink jet printing, IJP). The first film layer and the third film layer can be manufactured by chemical vapor deposition (chemical vapor deposition, CVD).

In the case that the display panel includes the encapsulation film layer 105 , the gain optical cavity of the sub-pixel 102 may be formed by the anode layer 1021 of the sub-pixel 102 and the film layer between the first film layer in the encapsulation film layer 105 . Therefore, the thickness of the film layer between the anode layer 1021 of the sub-pixel 102 and the first film layer in the packaging film layer 105 will affect the length of the microcavity of the sub-pixel 102 . Optionally, in this embodiment of the present application, the thickness of the light extraction layer 103 corresponding to the sub-pixels 102 of different colors can be adjusted so that the lengths of the microcavities of the sub-pixels 102 of different colors are different, so as to satisfy the optical gain characteristics of the sub-pixels 102 of different colors .

Referring to FIGS. 3 to 6 , the display panel 10 may further include: a pixel defining layer 106 , and the pixel defining layer 106 may be located on a side of the anode layer 1021 away from the base substrate 101 . The pixel defining layer 106 may have a plurality of hollow areas, and each hollow area may be used to expose an anode layer of a sub-pixel. And, the pixel defining layer may cover the edge of the anode layer of each sub-pixel.

To sum up, the embodiment of the present application provides a display panel, which includes a plurality of sub-pixels and a light extraction layer, and each sub-pixel includes an anode layer, a functional film layer and a cathode layer stacked in sequence. The plurality of sub-pixels includes at least sub-pixels of a first color and sub-pixels of a second color. Since the difference between the distance between the surface of the functional film layer far away from the base substrate and the base substrate in any two sub-pixels is less than the difference threshold, the flatness of the surface where the cathode layer is formed in the sub-pixels of different colors can be made relatively high. Well, the probability of breaking the cathode layer is reduced, and the display effect of the display panel is improved. At the same time, the thickness of the first part corresponding to the subpixel of the first color in the light extraction layer and the thickness of the second part corresponding to the subpixel of the second color are different, so that the thickness of the light extraction layer can meet the optical gain of the corresponding subpixel characteristics to ensure the luminous efficiency of the sub-pixels in the display panel.

FIG. 7 is a schematic structural diagram of a display device provided by an embodiment of the present application. Referring to FIG. 7 , the display device may include: a power supply component 20 and the display panel 10 provided in the above-mentioned embodiments. The power supply component 20 can be used to supply power to the display panel 10 .

Optionally, the display device can be any product or component with display function and fingerprint recognition function, such as si-OLED display device, electronic paper, mobile phone, tablet computer, TV set, monitor, notebook computer, digital photo frame or navigator.

It will be understood that although the terms first and second etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be referred to by These terms are limited. These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section. Thus, a first element, component, region, layer or section discussed above could be termed a second element, component, region, layer or section without departing from the teachings of the present disclosure.

Spatially relative terms such as "below", "above", "left", "right", etc. may be used herein for convenience of description to describe an element as illustrated in the figures Or the relationship of a feature to another element or feature(s). It will be understood that these spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "beneath" can encompass both an orientation of above and below. The device may be oriented otherwise (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. In addition, it will also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It will be further understood that the terms "comprising" and/or "comprising" when used in this specification specify the presence of stated features, integers, steps, operations, elements and/or parts, but do not exclude one or more other the presence or addition of one or more other features, integers, steps, operations, elements, parts and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. In this specification, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted to have meanings consistent with their meanings in the relevant field and/or in the context of this specification, and will not be idealized or overly be construed in a formal sense unless expressly so defined herein.

The above are only optional embodiments of the application, and are not intended to limit the application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the application shall be included in the protection of the application. within range.

Claims (15)

1. A display panel, characterized in that, the display panel (10) comprises: Substrate substrate (101); A plurality of sub-pixels (102) located on one side of the base substrate (101), each of the sub-pixels (102) includes an anode layer (1021), a functional film layer (1022) and a cathode layer (1023) stacked in sequence ), the area where each sub-pixel (102) is located forms the microcavity of the sub-pixel (102), and the plurality of sub-pixels (102) at least include a sub-pixel (102a) of a first color and a sub-pixel of a second color pixel(102b); and a light extraction layer (103) located on the side of the plurality of sub-pixels (102) away from the base substrate (101), the light extraction layer (103) at least includes a first part (1031) and a second part ( 1032), the orthographic projection of the first part (1031) on the base substrate (101) and the orthographic projection of the sub-pixel (102a) of the first color on the base substrate (101) are at least partially overlapping, the orthographic projection of the second part (1032) on the base substrate (101) is at least partly the orthographic projection of the sub-pixel (102b) of the second color on the base substrate (101) overlapping; Wherein, the functional film layers (1022) of any two sub-pixels (102) in the plurality of sub-pixels (102) are away from the surface of the base substrate (101) and between the base substrate (101) The difference of the distances is less than a difference threshold, and the thickness of the first portion (1031) is different from the thickness of the second portion (1032). 2. The display panel according to claim 1, characterized in that, the microcavity length of the subpixel (102a) of the first color is greater than the microcavity length of the subpixel (102b) of the second color, the the thickness of the first portion (1031) is greater than the thickness of said second portion (1032); Wherein, for each of the sub-pixels (102), the microcavity length of the sub-pixel (102) is used to represent the distance between the anode layer (1021) in the sub-pixel (102) and the distance away from the base substrate (101). The distance between the surface and the surface from which the sub-pixel (102) emits light. 3. The display panel according to claim 2, characterized in that, the plurality of sub-pixels (102) also include sub-pixels (102c) of a third color, and the light extraction layer (103) also includes a third part ( 1033), the orthographic projection of the third part (1033) on the base substrate (101) and the orthographic projection of the third color sub-pixel (102c) on the base substrate (101) are at least at least partial overlap; The thickness of the third portion (1033) is different from the thickness of the first portion (1031) and different from the thickness of the second portion (1032). 4. The display panel according to claim 3, characterized in that, the microcavity length of the subpixel (102b) of the second color is greater than the microcavity length of the subpixel (102c) of the third color, the The thickness of the second portion (1032) is greater than the thickness of said third portion (1033). 5. The display panel according to claim 4, wherein the first color is red, the second color is green, and the third color is blue. 6. The display panel according to any one of claims 1 to 5, characterized in that, the functional film layer (1022) comprises: an electron injection layer stacked in sequence along a direction away from the base substrate (101), and electron injection layers Transport layer, light emitting layer, optical adjustment layer, hole transport layer and hole injection layer. 7. The display panel according to claim 6, wherein the light-emitting layer and the optical adjustment layer in the functional film layers (1022) of the plurality of sub-pixels (102) are patterned film layers; Both the hole transport layer and the hole injection layer in the functional film layers (1022) of the plurality of sub-pixels (102) are shared film layers; Both the electron injection layer and the electron transport layer in the functional film layers (1022) of the multiple sub-pixels (102) are patterned film layers, or the electrons in the functional film layers (1022) of the multiple sub-pixels (102) Both the injection layer and the electron transport layer are shared film layers; Wherein, the patterned film layer includes a plurality of patterns arranged at intervals, and the orthographic projections of the plurality of patterns on the base substrate (101) are located in the area where the plurality of sub-pixels (102) are located, and are not located in the plurality of sub-pixels (102). The interval area of the sub-pixels (102), the orthographic projection of the common film layer on the base substrate (101) is located in the area where the plurality of sub-pixels (102) are located, and is located in the interval area of the plurality of sub-pixels (102). . 8. The display panel according to any one of claims 1 to 5, characterized in that, the functional film layer (1022) comprises: a first electron injection layer stacked in sequence along a direction away from the base substrate (101) , the first electron transport layer, the first light-emitting layer, the first optical adjustment layer, the first hole transport layer, the charge generation layer, the second electron injection layer, the second electron transport layer, the second light-emitting layer, the second optical adjustment layer, a second hole transport layer and a hole injection layer. 9. The display panel according to claim 8, characterized in that, the first light-emitting layer, the first optical adjustment layer, the charge generation layer, the second Both the light-emitting layer and the second optical adjustment layer are patterned film layers; The first hole transport layer, the second electron injection layer, the second electron transport layer, the second hole transport layer and the hole injection layer in the functional film layers (1022) of the plurality of sub-pixels (102) are shared film layer; Both the first electron injection layer and the first electron transport layer in the functional film layers (1022) of the multiple sub-pixels (102) are patterned film layers, or the functional film layers (1022) of the multiple sub-pixels (102) ) in the first electron injection layer and the first electron transport layer are shared film layer; Wherein, the patterned film layer includes a plurality of patterns arranged at intervals, and the orthographic projections of the plurality of patterns on the base substrate (101) are located in the area where the plurality of sub-pixels (102) are located, and are not located in the plurality of sub-pixels (102). The interval area of the sub-pixels (102), the orthographic projection of the common film layer on the base substrate (101) is located in the area where the plurality of sub-pixels (102) are located, and is located in the interval area of the plurality of sub-pixels (102). . 10. The display panel according to any one of claims 1 to 5, characterized in that, the functional film layer (1022) comprises: a hole injection layer stacked in sequence along a direction away from the base substrate (101), A hole transport layer, a first light emitting layer, a second light emitting layer, a first hole blocking layer, a charge generating layer, a third light emitting layer, a second hole blocking layer, an electron transport layer, and an electron injection layer. 11. The display panel according to claim 10, characterized in that, the hole injection layer in the functional film layer (1022) of the plurality of sub-pixels (102), the hole transport layer and the charge generation layer are patterned film layer; The first light-emitting layer, the second light-emitting layer, the first hole blocking layer, the third light-emitting layer, the second hole blocking layer, the electron transport layer and the The electron injection layer is a common film layer; Wherein, the patterned film layer includes a plurality of patterns arranged at intervals, and the orthographic projections of the plurality of patterns on the base substrate (101) are located in the area where the plurality of sub-pixels (102) are located, and are not located in the plurality of sub-pixels (102). The interval area of the sub-pixels (102), the orthographic projection of the common film layer on the base substrate (101) is located in the area where the plurality of sub-pixels (102) are located, and is located in the interval area of the plurality of sub-pixels (102). . 12. The display panel according to claim 11, characterized in that the display panel (10) further comprises: a color filter layer (104), and the color filter layer (104) is located in the plurality of sub-pixels (102) A side away from the base substrate (101); The color filter layer (104) includes a plurality of color-resisting blocks (1041) of different colors, and the area where each of the sub-pixels (102) is located is located on one of the color-resisting blocks (1041) on the base substrate (101). ) in the orthographic projection. 13. The display panel according to any one of claims 1 to 5, characterized in that, the material of the cathode layer (1023) is indium zinc oxide. 14. The display panel according to any one of claims 1 to 5, characterized in that, the display panel (10) is a silicon-based display panel. 15. A display device, characterized in that the display device comprises: a power supply assembly (20) and the display panel (10) according to any one of claims 1 to 14; The power supply component (20) is used to supply power to the display panel (10).

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