Display panel, display device and preparation method of display panel

Abstract

The embodiment of the invention provides a display panel, a display device and a preparation method of the display panel. The display panel comprises a substrate, a light-emitting functional layer and a light adjusting layer, the light-emitting functional layer is arranged on the substrate and comprises a first light-emitting unit, a second light-emitting unit and a light sensing unit, the first light-emitting unit is used for emitting first color light, the second light-emitting unit is used for emitting second color light, and the light sensing unit is used for sensing the second color light; the light adjusting layer is arranged on the side, away from the substrate, of the light-emitting functional layer and comprises a supporting part and a reflecting layer, a first opening is formed in the supporting part, the reflecting layer is at least coated on the inner wall face, facing the first opening, of the supporting part, and the orthographic projection of the first light-emitting unit on the substrate and the orthographic projection of the first opening on the substrate are at least partially overlapped. According to the invention, the signal-to-noise ratio of the photosensitive unit is improved, and the photosensitive sensitivity of the display panel is higher; meanwhile, optical color mixing of the adjacent light-emitting units can be reduced, and the display quality is improved.

Description

Technical Field

[0001] The present application relates to the technical field of display devices, and in particular to a display panel, a display device, and a method for manufacturing a display panel. Background Art

[0002] OLED (Organic Light-Emitting Diode) devices have become the next generation display technology with great competitiveness and development prospects due to their advantages such as all-solid-state structure, high brightness, full viewing angle, fast response speed, and flexible display. Biometrics plays an important role in smartphones, tablets, etc. The common existing technologies include facial recognition and fingerprint recognition, among which fingerprint recognition includes ultrasonic fingerprint, capacitive fingerprint and optical fingerprint. Among them, optical fingerprint has the advantages of high resolution, high sensitivity, and can be used for life and health detection. Summary of the invention

[0003] The embodiments of the present application provide a display panel, a display device, and a method for manufacturing a display panel, aiming to improve the photosensitivity of the display panel.

[0004] An embodiment of the first aspect of the present application provides a display panel, including a substrate, a light-emitting functional layer and a light adjustment layer; the light-emitting functional layer is arranged on the substrate and includes a first light-emitting unit, a second light-emitting unit and a photosensitive unit, the first light-emitting unit is used to emit a first color light, the second light-emitting unit is used to emit a second color light, and the photosensitive unit is used to sense the second color light; the light adjustment layer is arranged on the side of the light-emitting functional layer away from the substrate, the light adjustment layer includes a supporting part and a reflecting layer, the supporting part is provided with a first opening, the reflecting layer is at least coated on the inner wall surface of the supporting part facing the first opening, and the orthographic projection of the first light-emitting unit on the substrate and the orthographic projection of the first opening on the substrate at least partially overlap.

[0005] According to an implementation of the first aspect of the present application, an orthographic projection of the first light-emitting unit on the substrate is located within an orthographic projection of the first opening on the substrate.

[0006] According to any of the aforementioned embodiments of the first aspect of the present application, the orthographic projection of the photosensitive unit on the substrate is located outside the orthographic projection of the first opening on the substrate.

[0007] According to any of the aforementioned embodiments of the first aspect of the present application, along a direction away from the substrate, a distance between the inner wall surfaces located on opposite sides of the first opening gradually increases.

[0008] According to any of the aforementioned embodiments of the first aspect of the present application, in a plane perpendicular to the substrate, an angle between the inner wall surface and the substrate is 60 degrees to 70 degrees.

[0009] According to any of the aforementioned embodiments of the first aspect of the present application, the second light-emitting unit and the photosensitive unit are adjacent, the support portion is provided with a second opening, and the orthographic projections of the second light-emitting unit and the photosensitive unit on the substrate are located within the orthographic projection of the same second opening on the substrate.

[0010] According to any of the aforementioned embodiments of the first aspect of the present application, the reflective layer is arranged to cover the support portion, and the orthographic projection of the support portion on the substrate is located within the orthographic projection of the reflective layer on the substrate.

[0011] According to any of the aforementioned embodiments of the first aspect of the present application, the reflective layer is made of metal material.

[0012] According to any of the aforementioned embodiments of the first aspect of the present application, the metal material is silver or aluminum.

[0013] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the reflective layer is 80 nanometers to 100 nanometers.

[0014] According to any of the aforementioned embodiments of the first aspect of the present application, the support portion is made of organic material.

[0015] According to any of the aforementioned embodiments of the first aspect of the present application, the width of the orthographic projection of the support portion on the substrate is 18 micrometers to 24 micrometers.

[0016] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the support portion is 1.5 micrometers to 1.7 micrometers.

[0017] According to any of the aforementioned embodiments of the first aspect of the present application, the display panel further includes a pixel defining layer, the pixel defining layer is formed with a plurality of pixel openings, and the pixel openings respectively expose the first light-emitting unit, the second light-emitting unit and the photosensitive unit.

[0018] According to any of the aforementioned implementations of the first aspect of the present application, the pixel defining layer is black.

[0019] According to any of the aforementioned embodiments of the first aspect of the present application, the orthographic projection of the light adjustment layer on the substrate is located within the orthographic projection range of the pixel defining layer on the substrate.

[0020] According to any of the aforementioned embodiments of the first aspect of the present application, the photosensitive unit and the first light-emitting unit are arranged in the same layer.

[0021] According to any of the aforementioned embodiments of the first aspect of the present application, the light-emitting functional layer also includes a third light-emitting unit, which is used to emit a third color light. A third opening is provided on the support portion, and the reflective layer is coated on the inner wall surface of the support portion facing the third opening. The orthographic projection of the third light-emitting unit on the substrate and the orthographic projection of the third opening on the substrate at least partially overlap.

[0022] According to any of the aforementioned embodiments of the first aspect of the present application, the light-emitting functional layer includes a plurality of repeating units distributed in an array, the repeating units including a first light-emitting unit, a second light-emitting unit, a photosensitive unit and a third light-emitting unit; or, the repeating units include a first pixel row and a second pixel row arranged side by side along a second direction, the first pixel row includes a second light-emitting unit, a photosensitive unit and a first light-emitting unit arranged in sequence along the first direction, and the second pixel row includes a third light-emitting unit, a second light-emitting unit and a photosensitive unit arranged in sequence along the first direction.

[0023] According to any of the aforementioned implementations of the first aspect of the present application, the first pixel row and the second pixel row are staggered.

[0024] According to any of the aforementioned embodiments of the first aspect of the present application, the display panel also includes an encapsulation layer, the encapsulation layer includes a first inorganic layer, a first organic layer and a second inorganic layer arranged in sequence along a direction away from the substrate, the first inorganic layer is arranged on the side of the light-emitting functional layer away from the substrate, and the light adjustment layer is arranged on the side of the second inorganic layer away from the substrate.

[0025] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the first inorganic layer is 0.8 micrometer to 1 micrometer.

[0026] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the second inorganic layer is 0.8 micrometer to 1 micrometer.

[0027] According to any of the aforementioned embodiments of the first aspect of the present application, the thickness of the first organic layer is 8 micrometers to 10 micrometers.

[0028] An embodiment of the second aspect of the present application further provides a display device, comprising the display panel provided by any of the above-mentioned embodiments of the first aspect.

[0029] The third aspect of the present application also provides a method for preparing a display panel, including:

[0030] A pixel defining layer, a light emitting functional layer and an encapsulation layer are sequentially prepared on one side of the substrate, wherein the pixel defining layer is formed with a plurality of pixel openings, and the light emitting functional layer includes a first light emitting unit, a second light emitting unit and a photosensitive unit, wherein the first light emitting unit, the second light emitting unit and the photosensitive unit are respectively arranged in different pixel openings;

[0031] An insulating material layer is coated on a side of the encapsulation layer away from the substrate, and the insulating material layer is patterned to form a plurality of openings, and the remaining insulating material layer forms a support portion, wherein the plurality of openings include a first opening, and an orthographic projection of the first light-emitting unit on the substrate and an orthographic projection of the first opening on the substrate at least partially overlap;

[0032] A reflective material is prepared on the entire surface of one side of the substrate, wherein the reflective material includes a first portion covering the support portion and a second portion covering the bottom surfaces of the plurality of openings;

[0033] Applying photoresist on the side of the reflective material facing away from the substrate;

[0034] Performing an exposure and development process on the photoresist to remove the photoresist covering the second portion, and performing an etching process to remove the second portion not covered by the photoresist;

[0035] The remaining photoresist is stripped off, and the remaining reflective material forms a reflective layer.

[0036] In the display panel provided in the embodiment of the present application, the light-emitting functional layer includes a first light-emitting unit, a second light-emitting unit and a photosensitive unit. The first light-emitting unit and the second light-emitting unit realize the display function of the display panel by emitting light, and the photosensitive unit can sense light to realize photosensitive functions such as biometrics. The first light-emitting unit and the second light-emitting unit are respectively used to emit the first color light and the second color light of different colors, and the first light-emitting unit and the second light-emitting unit of different colors are used to realize different color display of the display panel. The photosensitive unit can be used to sense the second color light emitted by the second light-emitting unit. If the first color light is also captured by the photosensitive unit after reflection, the signal-to-noise ratio of the photosensitive unit will be reduced. In the present application, a reflective layer is set on the light-emitting side of the first light-emitting unit, and the first color light is emitted outward through the first opening, wherein the light of the first color light with a large angle will be reflected by the reflective layer on the inner wall surface of the first opening, and the transmission path is changed to block the deviated light from being reflected to the photosensitive unit, reduce the non-second color light captured by the photosensitive unit, and then improve the interference of other color lights, improve the signal-to-noise ratio of the photosensitive unit, and thus improve the photosensitivity of the display panel. At the same time, the provision of the light adjustment layer of the present application can also reduce the optical color mixing of adjacent light-emitting units and improve the display quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Other features, objects and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals represent the same or similar features.

[0038] Figure 1 is a structural schematic diagram of a display panel provided by a related embodiment;

[0039] Figure 2 is a schematic structural diagram of a repeating unit in a display panel provided in one embodiment of the present application;

[0040] Figure 3 yes Figure 2 Sectional view at AA in the middle;

[0041] Figure 4 is a schematic diagram of a layer structure of a display panel provided in an embodiment of the present application;

[0042] Figure 5 is a schematic structural diagram of a repeating unit in a display panel provided by another embodiment of the present application;

[0043] Figure 6 is a schematic diagram of a manufacturing process of a display panel provided in an embodiment of the present application;

[0044] Figure 7 This is one of the structural schematic diagrams of a display panel preparation process provided in an embodiment of the present application;

[0045] Figure 8 This is the second structural schematic diagram of a display panel preparation process provided by an embodiment of the present application;

[0046] Fig. 9 This is the third structural schematic diagram of a display panel preparation process provided by an embodiment of the present application;

[0047] Fig.10 This is a fourth structural schematic diagram of a display panel preparation process provided by an embodiment of the present application;

[0048] Fig.11 This is the fifth structural schematic diagram of a display panel preparation process provided by an embodiment of the present application;

[0049] Fig.12 This is the sixth structural schematic diagram of a display panel preparation process provided in an embodiment of the present application.

[0050] Description of reference numerals:

[0051] 1. Substrate;

[0052] 2. Pixel limiting layer;

[0053] 3. Light-emitting functional layer; 30. Repeating unit; 31. First light-emitting unit; 32. Second light-emitting unit; 33. Third light-emitting unit; 34. Photosensitive unit;

[0054] 4. Encapsulation layer; 41. First inorganic layer; 42. First organic layer; 43. Second inorganic layer;

[0055] 5. Light adjustment layer; 51. Support part; 52. Reflection layer; 511. First opening; 512. Second opening; 513. Third opening. DETAILED DESCRIPTION

[0056] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least some of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of some structures may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0057] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating directions or positional relationships, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0058] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the embodiments of the present application. In the description of the present application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0059] With the continuous development of technology, mobile terminals integrate more and more functional structures, such as integrating a photosensitive (Organic Photo Diode; OPD) unit into an OLED display panel to implement a fingerprint recognition function in the display unit OLED. Figure 1 As shown, Figure 1The arrows in the figure indicate the transmission path of light. The light emitted by the OLED light-emitting unit is reflected to the OPD unit through the user's fingerprint. The OPD unit converts the optical signal into an electrical signal, thereby realizing the recognition of the user's fingerprint information. Integrating the organic light-emitting diode and the photoelectric sensor in the panel can achieve a larger integration area and a thinner overall thickness. However, the OPD unit needs a higher sensitivity to recognize the optical signal, and the OLED display panel is usually provided with a variety of different colors of light. Therefore, the OPD unit is easily interfered by other optical signals, reducing its signal recognition (ie, signal-to-noise ratio), affecting the photosensitivity of the display panel. When the OPD is configured to realize fingerprint recognition, the OPD is required to have a higher recognition accuracy. Therefore, the OPD is required to have a higher signal-to-noise ratio (Signal to Interference plus Noise Ratio, SNR).

[0060] In order to solve the above technical problems, this application is proposed. In order to better understand this application, Figures 2 to 12 The display panel, the display device and the method for manufacturing the display panel according to the embodiments of the present application are described in detail.

[0061] like Figures 2 to 4 As shown, the display panel provided by the embodiment of the first aspect of the present application includes a substrate 1, a light-emitting functional layer 3 and a light adjustment layer 5; the light-emitting functional layer 3 is arranged on the substrate 1 and includes a first light-emitting unit 31, a second light-emitting unit 32 and a photosensitive unit 34, the first light-emitting unit 31 is used to emit a first color light, the second light-emitting unit 32 is used to emit a second color light, and the photosensitive unit 34 is used to sense the second color light; the light adjustment layer 5 is arranged on the side of the light-emitting functional layer 3 away from the substrate 1, the light adjustment layer 5 includes a supporting portion 51 and a reflecting layer 52, a first opening 511 is opened on the supporting portion 51, and the reflecting layer 52 is at least coated on the inner wall surface of the supporting portion 51 facing the first opening 511, and the orthographic projection of the first light-emitting unit 31 on the substrate 1 and the orthographic projection of the first opening 511 on the substrate 1 at least partially overlap.

[0062] In the display panel of the present application, the light-emitting functional layer 3 includes a first light-emitting unit 31, a second light-emitting unit 32 and a photosensitive unit 34. The first light-emitting unit 31 and the second light-emitting unit 32 realize the display function of the display panel by emitting light, and the photosensitive unit 34 can sense light to realize photosensitive functions such as biometrics. The first light-emitting unit 31 and the second light-emitting unit 32 are respectively used to emit first color light and second color light of different colors. The first light-emitting unit 31 and the second light-emitting unit 32 of different colors are used to realize different color display of the display panel. The photosensitive unit 34 can be used to sense the second color light emitted by the second light-emitting unit 32, such as Figure 1As shown, if the first color light is also captured by the photosensitive unit 34 after reflection (fingerprint reflection or internal structure reflection of the display panel), the signal-to-noise ratio of the photosensitive unit 34 will be reduced. In the present application, a reflective layer 52 is provided on the light-emitting side of the first light-emitting unit 31, and the first color light is emitted outward through the first opening 511, as shown in FIG. Figure 3 As shown, Figure 3 The arrows in the figure indicate the transmission path of the light, wherein the light of the first color light with a large angle will be reflected by the reflective layer 52 on the inner wall surface of the first opening 511, changing the transmission path to block the deviated light from being reflected on the photosensitive unit 34, reducing the non-second color light captured by the photosensitive unit 34, thereby improving the interference of other color lights, improving the signal-to-noise ratio of the photosensitive unit 34, and thus improving the photosensitivity of the display panel. At the same time, the setting of the light adjustment layer 5 of the present application can also reduce the optical color mixing of adjacent light-emitting units and improve the display quality.

[0063] In the related art, there is also a solution to improve the signal-to-noise ratio by designing a light shielding layer on the array backplane and the opposite side of the backplane to block the deviated light from being received by the OPD device; however, this solution requires a new mask template to be opened in the array backplane section and the module section, and the process is relatively cumbersome and the cost is high; and the compatibility of the light shielding layer material with the array process needs to be considered. After the light adjustment layer 5 is set in the present application, the above-mentioned process for setting the light shielding layer can be omitted, and there is no need to open a new mask template in the array backplane section, and there is no need to consider the compatibility of the light shielding layer with the array process and materials. Accordingly, the cost can be reduced, and the process is relatively simpler.

[0064] Optional, see Figure 3 , the photosensitive unit 34 can be used for fingerprint recognition. After the light emitted by the second light-emitting unit 32 reaches the screen surface, it is reflected by the user's fingerprint to the photosensitive unit 34, so that the photosensitive unit 34 can perform fingerprint recognition based on the reflected light. Among them, the photosensitive unit 34 can generate different identification information according to the difference in light reflection between the valleys and ridges of the finger, so that different fingerprint path information can be recorded and recognized. It can be understood that the closer the angle between the incident light and the receiving surface of the photosensitive unit 34 is to 90°, the more accurate the recording and recognition effects of the fingerprint information will be. The photosensitive unit 34 can be an organic photodetector (OPD), an amorphous silicon-based photodiode (a-Si PD), and an oxide phototransistor (such as IGZO, IZO / IGZO photosensitive TFT), etc. Optionally, the photosensitive unit 34 is an OPD.

[0065] In some optional embodiments, referring to Figure 4The light-emitting functional layer 3 also includes a third light-emitting unit 33, which is used to emit a third color light. A third opening 513 is opened on the support portion 51, and the reflective layer 52 is coated on the inner wall surface of the support portion 51 facing the third opening 513. The orthographic projection of the third light-emitting unit 33 on the substrate 1 and the orthographic projection of the third opening 513 on the substrate 1 at least partially overlap.

[0066] In these embodiments, the structure of the third opening 513 can be set with reference to the first opening 511, so that the large-angle light in the third color light will also be reflected by the reflective layer 52 on the inner wall of the third opening 513 to block the deviated light from being reflected onto the photosensitive unit 34, thereby reducing the non-second color light captured by the photosensitive unit 34, and further improving the interference of other color lights, thereby improving the signal-to-noise ratio of the photosensitive unit 34, and thus improving the photosensitivity of the display panel.

[0067] Optionally, the first light emitting unit 31 can be used to emit red light, the second light emitting unit 32 can be used to emit green light, and the third light emitting unit 33 can be used to emit blue light. In an OLED display panel, since green light accounts for about 70% of the light intensity, using reflected green light as a light source to achieve fingerprint recognition has a relatively high signal-to-noise ratio.

[0068] Optionally, the orthographic projection of the first light emitting unit 31 on the substrate 1 is located within the orthographic projection of the first opening 511 on the substrate 1. In this embodiment, the first opening 511 does not block the light emitted vertically upward by the first light emitting unit 31, thereby improving the display effect. In the same principle, the structures of the third light emitting unit 33 and the third opening 513 can be set with reference to the first light emitting unit 31 and the first opening 511, and have the same advantages, which are the same below.

[0069] Optionally, the orthographic projection of the photosensitive unit 34 on the substrate 1 is located outside the orthographic projection of the first opening 511 on the substrate 1. The staggered arrangement of the photosensitive unit 34 and the first opening 511 can effectively reduce the light emitted by the first light-emitting unit 31 being captured by the photosensitive unit 34 through the first opening 511 after reflection, and further improve the signal-to-noise ratio of the photosensitive unit 34.

[0070] In some optional embodiments, referring to Figure 4 , along the direction away from the substrate 1 , the distance between the inner wall surfaces located on two opposite sides of the first opening 511 gradually increases.

[0071] In these embodiments, the size of the first opening 511 is gradually increased in the direction away from the substrate 1, so that after the large-angle first color light incident toward the inner wall of the first opening 511 is reflected by the reflective layer 52, the corrected reflection path tends to be emitted vertically upward, thereby reducing the proportion of the light reflected to the photosensitive unit 34 and improving the luminous effect of the display panel.

[0072] Optionally, the thickness direction of the display panel is Figure 3 In the Z-axis direction of the view shown, in the plane perpendicular to the substrate 1, that is, in the plane where the Z-axis is located, the angle between the inner wall surface and the substrate 1 is 60 degrees to 70 degrees. The plane perpendicular to the substrate 1 is a vertical plane, and the shape of the first opening 511 can be an inverted cone, then the cross-section of the inner wall surface of the first opening 511 is the same shape, and the angle between the two opposite inner wall surfaces of the first opening 511 and the substrate 1 can be within the range of 60 degrees to 70 degrees, so that the first color light after reflection by the reflective layer 52 tends to be emitted vertically upward. That is, the slope angle of the conical first opening 511 is correspondingly 60 degrees to 70 degrees.

[0073] In some optional embodiments, referring to Figure 4 The second light emitting unit 32 and the photosensitive unit 34 are adjacent to each other, the support portion 51 is provided with a second opening 512 , and the orthographic projections of the second light emitting unit 32 and the photosensitive unit 34 on the substrate 1 are located within the orthographic projection of the same second opening 512 on the substrate 1 .

[0074] In these embodiments, there is no light adjustment layer 5 blocking the second light emitting unit 32 and the light sensing unit 34, and the light sensing unit 34 disposed adjacent to the second light emitting unit 32 can well receive the second color light emitted by the second light emitting unit 32 and reflected by the user's fingerprint, so as to realize the fingerprint recognition function with high sensitivity. At the same time, the second light emitting unit 32 and the light sensing unit 34 are disposed adjacent to each other and are within the orthographic projection of the same second opening 512 on the substrate 1, so that the second light emitting unit 32 and the light sensing unit 34 share a first opening 511, which can also simplify the preparation process of the light adjustment layer 5.

[0075] Optionally, the reflective layer 52 covers the support portion 51, and the orthographic projection of the support portion 51 on the substrate 1 is located within the orthographic projection of the reflective layer 52 on the substrate 1. In this embodiment, when patterning is performed to form the support portion 51 and the reflective layer 52, the same mask can be used to simplify the preparation process.

[0076] Optionally, the reflective layer 52 is made of a metal material. Metal materials have good reflective effects and a mature preparation process. Preferably, the metal material may be silver or aluminum.

[0077] Optionally, the thickness of the reflective layer 52 is 80 nanometers to 100 nanometers. The thickness of the reflective layer 52 is relatively smaller than the thickness of the support portion 51 , and only a thin reflective layer 52 needs to be coated on the support portion 51 to achieve a good reflection effect.

[0078] Optionally, the support portion 51 is made of an organic material. The organic material has a relatively thick thickness and good flatness, and can provide stress support for the reflective layer 52. The organic material may be polyimide.

[0079] Optionally, the width of the support portion 51 projected on the substrate 1 is 18 to 24 microns. The support portion 51 between the first opening 511 and the second opening 512 is projected on the substrate 1 to be 18 to 24 microns, so as to adapt to the spacing between two adjacent light-emitting units or the spacing between a light-emitting unit and a photosensitive unit 34, and will not block the emission of light and the reception of light by the photosensitive unit 34. Correspondingly, the thickness of the support portion 51 can be 1.5 to 1.7 microns.

[0080] In some optional embodiments, referring to Figure 4 The display panel further includes a pixel defining layer 2, which is formed with a plurality of pixel openings, which respectively expose the first light emitting unit 31, the second light emitting unit 32 and the photosensitive unit 34. The pixel defining layer 2 is used to separate the light emitting units and the photosensitive unit 34 to prevent them from affecting each other and causing interference.

[0081] Optionally, the first light emitting unit 31 , the second light emitting unit 32 and the photosensitive unit 34 are respectively located in different pixel openings.

[0082] Optionally, the pixel defining layer 2 is black. The black pixel defining layer 2 can absorb light and is opaque, which can reduce the situation where the light emitted by the first light emitting unit 31, the second light emitting unit 32 and the third light emitting unit 33 is directly captured by the photosensitive unit 34 without reflection, further improving the signal-to-noise ratio.

[0083] Optionally, the orthographic projection of the light adjustment layer 5 on the substrate 1 is located within the orthographic projection range of the pixel defining layer 2 on the substrate 1. That is, the orthographic projections of the support portion 51 and the reflective layer 52 on the substrate 1 are both arranged away from the light emitting unit and the photosensitive unit 34, thereby reducing the impact on the light emitted by the light emitting unit and the light received by the photosensitive unit 34, thereby improving the display effect and photosensitivity.

[0084] Optionally, the photosensitive unit 34 is arranged in the same layer as the first light-emitting unit 31. In general, the photosensitive unit 34 is arranged in the same layer as the first light-emitting unit 31, the second light-emitting unit 32 and the third light-emitting unit 33; by arranging the photosensitive unit 34 in the same layer as the light-emitting unit, the photosensitive unit 34 can share the electrode layer with the light-emitting unit, so that there is no need to introduce additional electrode wiring to realize the fingerprint recognition function; compared with arranging the photosensitive unit 34 under the pixel defining layer 2 or in the flat layer, the absorption of the second color light by the pixel defining layer 2 or the flat layer can be effectively avoided. The display panel of this embodiment can avoid the problem of reduced signal strength caused by the absorption of the second color light by the pixel defining layer 2 or the flat layer before reaching the photoelectric conversion layer, thereby improving the signal-to-noise ratio of the fingerprint recognition unit when performing fingerprint recognition detection.

[0085] It should be noted that in the OLED display panel of the present application, the fingerprint recognition area can be extended to the entire panel, and the recognition area can be customized according to the needs of the user to achieve fingerprint recognition. The OPD is also a sandwich structure similar to the light-emitting unit, and can share a common layer with the light-emitting unit, and the device development can be completed through the evaporation process, so the light-emitting unit can be easily integrated with the OPD in the display panel.

[0086] In some optional embodiments, the light-emitting functional layer 3 includes a plurality of repeating units 30 distributed in an array, Figure 2 The repeating unit 30 includes a first light emitting unit 31, a second light emitting unit 32, a photosensitive unit 34 and a third light emitting unit 33. Optionally, the first light emitting unit 31, the second light emitting unit 32, the photosensitive unit 34 and the third light emitting unit 33 are arranged in sequence along the first direction X.

[0087] In the repeating unit 30, the number ratio of the first light-emitting unit 31, the second light-emitting unit 32, the photosensitive unit 34 and the third light-emitting unit 33 is 1:1:1:1, and the second light-emitting unit 32 and the photosensitive unit 34 are arranged adjacent to each other, which can well receive the reflected light of the second light-emitting unit 32. The structure of this embodiment is simple and easy to arrange. Optionally, in adjacent rows arranged along the second direction Y, the repeating units 30 are staggered with each other, which can improve the display stripe phenomenon of the display panel and improve the display effect.

[0088] In some optional embodiments, referring to Figure 5 The repeating unit 30 includes a first pixel row and a second pixel row arranged side by side along the second direction Y, the first pixel row includes a second light emitting unit 32, a photosensitive unit 34 and a first light emitting unit 31 arranged in sequence along the first direction X, and the second pixel row includes a third light emitting unit 33, a second light emitting unit 32 and a photosensitive unit 34 arranged in sequence along the first direction. In the repeating unit 30, the number ratio of the first light emitting unit 31, the second light emitting unit 32, the photosensitive unit 34 and the third light emitting unit 33 is 1:2:2:1, and the photosensitive unit 34 and the second light emitting unit 32 in each pixel row are adjacently arranged, and the number is relatively large relative to the first light emitting unit 31 and the third light emitting unit 33, so that the second color light entering the photosensitive unit 34 accounts for a larger proportion, thereby improving the interference of other color lights and improving the signal-to-noise ratio of the photosensitive unit 34.

[0089] In some optional embodiments, the first pixel row and the second pixel row are staggered. Figure 5As shown, in the second direction Y, the third light emitting unit 33 of the second pixel row is arranged opposite to the gap between the second light emitting unit 32 and the photosensitive unit 34 of the first pixel row, and the second light emitting unit 32 of the second pixel row is arranged opposite to the gap between the photosensitive unit 34 and the first light emitting unit 31 of the first pixel row. In these embodiments, on the one hand, the signal-to-noise ratio of the photosensitive unit 34 can be improved, and on the other hand, the display stripe phenomenon of the display panel can be improved to improve the display effect.

[0090] In some optional embodiments, referring to Figure 3 and Figure 4 The display panel also includes an encapsulation layer 4, which includes a first inorganic layer 41, a first organic layer 42 and a second inorganic layer 43 arranged in sequence along a direction away from the substrate 1, the first inorganic layer 41 is arranged on the side of the light-emitting functional layer 3 away from the substrate 1, and the light adjustment layer 5 is arranged on the side of the second inorganic layer 43 away from the substrate 1.

[0091] In these embodiments, the three-layer structure of the first inorganic layer 41, the first organic layer 42 and the second inorganic layer 43 has a good encapsulation effect. The inorganic layer has the advantages of good density and thin thickness, and the organic layer is relatively thick and has good flatness, which can make each supporting part 51 in the light adjustment layer 5 relatively flat; the encapsulation layer 4 as a whole protects the light emitting functional layer 3, and is arranged between the light adjustment layer 5 and the light emitting functional layer 3, so that the light adjustment layer 5 can effectively reflect large-angle light in the first color light or the third color light, thereby improving the signal-to-noise ratio of the photosensitive unit 34.

[0092] Optionally, the thickness of the first inorganic layer 41 is 0.8 micrometers to 1 micrometer, the thickness of the second inorganic layer 43 is 0.8 micrometers to 1 micrometer, and the thickness of the first organic layer 42 is 8 micrometers to 10 micrometers. The material of the first inorganic layer 41 can be silicon oxynitride (SiON) or silicon nitride (SiN), preferably silicon oxynitride; the material of the second inorganic layer 43 can also be silicon oxynitride or silicon nitride, preferably silicon nitride, and the material of the first organic layer 42 is mainly acrylic polymer.

[0093] In the present application, a micrometer-level organic pattern is arranged above the second inorganic layer 43 in the encapsulation layer 4, at a position corresponding to the pixel defining layer 2 outside the first light-emitting unit 31 and the third light-emitting unit 33, and the periphery of the organic pattern is wrapped by a reflective layer 52 made of a metal material. In this way, the light of the first light-emitting unit 31 and the third light-emitting unit 33 at a large angle can be effectively reflected and emitted from above the first light-emitting unit 31 and the third light-emitting unit 33. On the one hand, it can reduce the light emitted by the first light-emitting unit 31 and the third light-emitting unit 33 from being captured by the photosensitive unit 34, thereby improving the signal-to-noise ratio, and can also reduce the optical color mixing between adjacent light-emitting units, thereby improving the display quality.

[0094] The embodiment of the second aspect of the present application also provides a display device, including the display panel of any of the above-mentioned embodiments of the first aspect. Since the display device provided by the embodiment of the second aspect of the present application includes the display panel of any of the above-mentioned embodiments of the first aspect, the display device provided by the embodiment of the second aspect of the present application has the beneficial effects of the display panel of any of the above-mentioned embodiments of the first aspect, which will not be repeated here.

[0095] The display device in the embodiments of the present application includes but is not limited to mobile phones, personal digital assistants (PDAs), tablet computers, e-books, televisions, access control systems, smart landline phones, consoles, and other devices with display functions.

[0096] The third aspect of the present application also provides a method for preparing a display panel. The display panel may be a display panel provided by any of the first aspect embodiments described above. Figure 6 , Figure 6 1 is a schematic diagram of a manufacturing process of a display panel provided by an embodiment of the present application. The manufacturing method of the display panel may include:

[0097] Step S10: sequentially prepare a pixel defining layer, a light emitting functional layer and an encapsulation layer on one side of the substrate, wherein the pixel defining layer is formed with a plurality of pixel openings, and the light emitting functional layer includes a first light emitting unit, a second light emitting unit and a photosensitive unit, and the first light emitting unit, the second light emitting unit and the photosensitive unit are respectively arranged in different pixel openings. Figure 7 shown.

[0098] Step S20: coating an insulating material layer on the side of the encapsulation layer away from the substrate, patterning the insulating material layer to form a plurality of openings, and the remaining insulating material layer forms a support portion, wherein the plurality of openings include a first opening, and the orthographic projection of the first light-emitting unit on the substrate and the orthographic projection of the first opening on the substrate at least partially overlap. Figure 8 shown.

[0099] Step S30: preparing a reflective material on the entire surface of one side of the substrate, the reflective material comprising a first portion covering the support portion and a second portion covering the bottom surfaces of the plurality of openings. Fig. 9 shown.

[0100] Step S40: Apply photoresist on the side of the reflective material facing away from the substrate. Fig.10 shown.

[0101] Step S50: performing an exposure and development process on the photoresist to remove the photoresist covering the second portion, and performing an etching process to remove the second portion not covered by the photoresist. Fig.11 shown.

[0102] Step S60: stripping off the remaining photoresist, and the remaining reflective material forms a reflective layer. Fig.12 shown.

[0103] Reference Figure 7 and Figure 8 , corresponding to steps S10 to S20, the organic pattern is patterned to form a support portion 51, and the support portion 51 is correspondingly formed with a first opening 511 and a third opening 513 corresponding to the first light emitting unit 31 and the third light emitting unit 33, and a second opening 512 corresponding to the second light emitting unit 32 and the photosensitive unit 34; Figures 9 to 12 ,like Fig. 9 As shown, a layer of reflective material is coated on the support portion 51, such as Fig.10 As shown, a photoresist is coated on the reflective material. Fig.11 As shown, the photoresist is exposed, developed, and the excess reflective material is etched. Fig.12 As shown, the photoresist is stripped off to form a reflective layer, wherein the reflective material may be a metal material.

[0104] Please refer to Figures 2 to 12 In the display panel prepared by the method provided in the embodiment of the present application, the display panel includes a substrate 1, a pixel defining layer 2, a light-emitting functional layer 3 and a light adjustment layer 5. The light-emitting functional layer 3 includes a first light-emitting unit 31, a second light-emitting unit 32, a photosensitive unit 34 and a third light-emitting unit 33. The first light-emitting unit 31, the second light-emitting unit 32 and the third light-emitting unit 33 emit light to realize the display function of the display panel, and the photosensitive unit 34 can sense light to realize photosensitive functions such as biometrics. The first light-emitting unit 31 and the second light-emitting unit 32 are respectively used to emit first color light and second color light of different colors. The first light-emitting unit 31, the second light-emitting unit 32 and the third light-emitting unit 33 of different colors are used to realize different color displays of the display panel. The photosensitive unit 34 can be used to sense the second color light emitted by the second light-emitting unit 32; the present application sets a reflective layer 52 on the light-emitting side of the first light-emitting unit 31 and the third light-emitting unit 33, respectively, and the first color light or the third color light respectively passes through the first opening 511 or the third opening 513 to emit outward, wherein the large-angle light in the first color light or the third color light will be reflected by the reflective layer 52 on the inner wall surface of the first opening 511 or the third opening 513, changing the transmission path to block the deviated light from being reflected on the photosensitive unit 34, reducing the non-second color light captured by the photosensitive unit 34, thereby improving the interference of other color lights, improving the signal-to-noise ratio of the photosensitive unit 34, and thus improving the photosensitivity of the display panel. The setting of the light adjustment layer 5 can also reduce the optical color mixing of adjacent light-emitting units and improve the display quality.

[0105] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A display panel, characterized in that: include: substrate; A light-emitting functional layer, disposed on the substrate and comprising a first light-emitting unit, a second light-emitting unit and a photosensitive unit, wherein the first light-emitting unit is used to emit a first color light, the second light-emitting unit is used to emit a second color light, and the photosensitive unit is used to sense the second color light; A light adjustment layer is arranged on the side of the light-emitting functional layer away from the substrate, the light adjustment layer includes a support portion and a reflective layer, the support portion is provided with a first opening, the reflective layer is at least coated on the inner wall surface of the support portion facing the first opening, and the orthographic projection of the first light-emitting unit on the substrate and the orthographic projection of the first opening on the substrate at least partially overlap.

2. The display panel according to claim 1, characterized in that: The orthographic projection of the first light emitting unit on the substrate is located within the orthographic projection of the first opening on the substrate; Preferably, the orthographic projection of the photosensitive unit on the substrate is located outside the orthographic projection of the first opening on the substrate.

3. The display panel according to claim 2, characterized in that: Along the direction away from the substrate, the distance between the inner wall surfaces located on two opposite sides of the first opening gradually increases; Preferably, in a plane perpendicular to the substrate, an angle between the inner wall surface and the substrate is 60 degrees to 70 degrees.

4. The display panel according to claim 1, characterized in that: The second light emitting unit is adjacent to the photosensitive unit, the support portion is provided with a second opening, and the orthographic projections of the second light emitting unit and the photosensitive unit on the substrate are located within the orthographic projection of the same second opening on the substrate.

5. The display panel according to claim 1, characterized in that: The reflective layer is arranged to cover the support portion, and the orthographic projection of the support portion on the substrate is located within the orthographic projection of the reflective layer on the substrate; Preferably, the reflective layer is made of metal material; Preferably, the metal material is silver or aluminum; Preferably, the thickness of the reflective layer is 80 nanometers to 100 nanometers; Preferably, the support portion is made of organic material; Preferably, the width of the orthographic projection of the support portion on the substrate is 18 microns to 24 microns; Preferably, the thickness of the support portion is 1.5 microns to 1.7 microns.

6. The display panel according to claim 1, characterized in that: The display panel further includes a pixel defining layer, wherein the pixel defining layer is formed with a plurality of pixel openings, and the pixel openings respectively expose the first light emitting unit, the second light emitting unit, and the photosensitive unit; Preferably, the pixel defining layer is black; Preferably, the orthographic projection of the light adjustment layer on the substrate is located within the orthographic projection range of the pixel defining layer on the substrate; Preferably, the photosensitive unit and the first light-emitting unit are arranged in the same layer; Preferably, the orthographic projection of the pixel opening exposing the first light-emitting unit on the substrate is located within the orthographic projection of the first opening on the substrate.

7. The display panel according to any one of claims 1 to 6, characterized in that: The light-emitting functional layer further includes a third light-emitting unit, the third light-emitting unit is used to emit a third color light, a third opening is opened on the support portion, the reflective layer is coated on the inner wall surface of the support portion facing the third opening, and the orthographic projection of the third light-emitting unit on the substrate and the orthographic projection of the third opening on the substrate at least partially overlap; Preferably, the light-emitting functional layer comprises a plurality of repeating units distributed in an array. The repeating unit includes the first light-emitting unit, the second light-emitting unit, the photosensitive unit and the third light-emitting unit; Alternatively, the repeating unit includes a first pixel row and a second pixel row arranged side by side along the second direction, the first pixel row includes the second light-emitting unit, the photosensitive unit and the first light-emitting unit arranged in sequence along the first direction, and the second pixel row includes the third light-emitting unit, the second light-emitting unit and the photosensitive unit arranged in sequence along the first direction; Preferably, the first pixel row and the second pixel row are staggered.

8. The display panel according to any one of claims 1 to 6, characterized in that: The display panel further includes an encapsulation layer, the encapsulation layer including a first inorganic layer, a first organic layer and a second inorganic layer sequentially arranged in a direction away from the substrate, the first inorganic layer is arranged on a side of the light-emitting functional layer away from the substrate, and the light adjustment layer is arranged on a side of the second inorganic layer away from the substrate; Preferably, the thickness of the first inorganic layer is 0.8 micrometer to 1 micrometer; Preferably, the thickness of the second inorganic layer is 0.8 micrometer to 1 micrometer; Preferably, the thickness of the first organic layer is 8 micrometers to 10 micrometers.

9. A display device, characterized in that: The invention comprises the display panel as claimed in any one of claims 1 to 8.

10. A method for preparing a display panel, characterized in that: include: A pixel defining layer, a light emitting functional layer and an encapsulation layer are sequentially prepared on one side of the substrate, wherein the pixel defining layer is formed with a plurality of pixel openings, and the light emitting functional layer includes a first light emitting unit, a second light emitting unit and a photosensitive unit, wherein the first light emitting unit, the second light emitting unit and the photosensitive unit are respectively arranged in different pixel openings; An insulating material layer is coated on a side of the encapsulation layer facing away from the substrate, and the insulating material layer is patterned to form a plurality of openings, and the remaining insulating material layer forms a support portion, wherein the plurality of openings include a first opening, and an orthographic projection of the first light-emitting unit on the substrate and an orthographic projection of the first opening on the substrate at least partially overlap; Preparing a reflective material on the entire surface of one side of the substrate, wherein the reflective material includes a first portion covering the support portion and a second portion covering the bottom surfaces of the plurality of openings; Applying photoresist on the side of the reflective material facing away from the substrate; Performing an exposure and development process on the photoresist to remove the photoresist covering the second portion, and removing the second portion not covered by the photoresist by an etching process; The remaining photoresist is stripped off, and the remaining reflective material forms a reflective layer.

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