Display panel and manufacturing method thereof, and display device

Abstract

The present application provides a display panel, a method for manufacturing the same, and a display device. The display panel includes a substrate and a pixel-defining layer disposed on one side of the substrate. The pixel-defining layer includes multiple pixel openings, each of which contains a light-emitting unit; and a light-shielding layer, located on a side of the pixel-defining layer away from the substrate. The light-shielding layer includes multiple first openings corresponding to the pixel openings. The light-shielding layer can block light emitted by the light-emitting unit within a predetermined viewing angle, thereby improving color shift within a certain viewing angle range and further enhancing the performance of the display panel.

Description

Technical Field

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

[0002] Organic Light-Emitting Diodes (OLEDs) are hailed as the next generation of flat-panel displays. Compared to the current mainstream liquid crystal displays (LCDs), they offer advantages such as self-luminescence, wide viewing angles, high contrast, fast response times, and thin panels (flattening). However, as the viewing angle (viewing angle) of a display panel increases, the color displayed by the panel changes chromaticity, resulting in color shift within certain viewing angles. Summary of the Invention

[0003] In view of this, the present application provides a display panel and a method for manufacturing the same, as well as a display device, to solve the problem of color shift in a display panel within a certain viewing angle range.

[0004] According to a first aspect of the present application, there is provided a display panel, which includes a substrate and a pixel defining layer arranged on one side of the substrate, the pixel defining layer including a plurality of pixel openings, in which a light-emitting unit is arranged; a light-shielding layer is located on a side of the pixel defining layer away from the substrate, the light-shielding layer including a plurality of first openings corresponding to the pixel openings, and the light-shielding layer is used to block light of a predetermined viewing angle emitted by the light-emitting unit; the projection of the first opening on the substrate covers the projection of the pixel opening on the substrate; the projection center of the first opening on the substrate coincides with the projection center of the pixel opening on the substrate; wherein the distance difference between the edge of the first opening and the edge of the pixel opening in at least two directions of the plane where the display panel is located is less than or equal to a preset distance difference threshold; or, the shape of the first opening is the same as the shape of the pixel opening, and the distance between the edge of the first opening and the edge of the pixel opening in any direction of the plane where the display panel is located is equal.

[0005] In a specific embodiment of the first aspect of the present application, the light shielding layer further includes a plurality of second openings, and projections of the second openings on the substrate do not overlap with projections of the pixel openings on the substrate.

[0006] In a specific embodiment of the first aspect of the present application, the second opening is located in a light-shielding region between at least two adjacent first openings, and an area of ​​the light-shielding region meets a preset area threshold.

[0007] In a specific embodiment of the first aspect of the present application, the display panel also includes a packaging structure, which includes a packaging cover plate and a sealing frame arranged around the periphery of the multiple light-emitting units and bonding the substrate and the packaging cover plate, and the light-shielding layer is used to support the packaging cover plate.

[0008] The second aspect of the present application provides a method for preparing a display panel, which includes providing a substrate; preparing a pixel defining layer on one side of the substrate, the pixel defining layer including a plurality of pixel openings, and a light-emitting unit is arranged in the pixel opening; preparing a light-shielding layer on a side of the pixel defining layer away from the substrate, the light-shielding layer including a plurality of first openings, the first openings corresponding to the pixel openings, the light-shielding layer being used to block light of a predetermined viewing angle emitted by the light-emitting unit, the projection of the first opening on the substrate covering the projection of the pixel opening on the substrate; the projection center of the first opening on the substrate coincides with the projection center of the pixel opening on the substrate; wherein the distance difference between the edge of the first opening and the edge of the pixel opening in at least two directions of the plane where the display panel is located is less than or equal to a preset distance difference threshold; or, the shape of the first opening is the same as the shape of the pixel opening, and the distance between the edge of the first opening and the edge of the pixel opening in any direction of the plane where the display panel is located is equal.

[0009] A third aspect of the present application provides a display device, which includes the display panel mentioned in the first aspect.

[0010] In the display panel provided in the embodiment of the present application, a light-shielding layer is provided on the side of the pixel-defining layer away from the substrate. The light-shielding layer includes a plurality of first openings corresponding to the pixel openings. The light-shielding layer can block the light of a predetermined viewing angle emitted by the light-emitting unit, thereby improving the problem of color deviation within a partial viewing angle range, thereby further improving the performance of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the planar structure of a display panel provided in one embodiment of the present application.

[0012] Figure 2 for Figure 1 FIG. 1 is a schematic diagram of a cross-sectional structure of a display panel along cutting line AA′.

[0013] Figure 3 A schematic structural diagram of a light-emitting unit provided in one embodiment of the present application.

[0014] Figure 4 This is a schematic top view of a display panel provided in one embodiment of the present application.

[0015] Figure 5 This is a schematic top view of a display panel provided in another embodiment of the present application.

[0016] Figure 6 This is a schematic top view of a display panel provided in yet another embodiment of the present application.

[0017] Figure 7 This is a schematic top view of a display panel provided in yet another embodiment of the present application.

[0018] Figure 8 A schematic flow chart of a method for manufacturing a display panel provided in one embodiment of the present application.

[0019] Figure 9 Shown is a schematic structural diagram of a display device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0021] The OLED display panel generally includes an array substrate and an OLED device arranged on the array substrate, wherein the OLED device includes a pixel defining layer (Pixel Defining Layer, PDL) and a plurality of support columns (Spacer, SPC for short) arranged on the pixel defining layer. The inventors have found that in the related art, an SPC is provided on the pixel defining layer that defines the pixel unit. For a pixel unit, in its light emitting direction, SPC is provided in some directions and not in some directions. The light emitted by the pixel unit will interact with the SPC. For example, the SPC changes the path of the light or changes the brightness of the light, etc., so that the SPC causes a certain degree of obstruction to the light output of the pixel unit, and the obstruction conditions are different in different directions. It is understandable that the display panel produces color deviation when the user observes the display panel at a partial viewing angle. The light in some emission directions will not interact with the SPC in all directions, such as the light perpendicular to the thickness direction of the display panel, so the SPC causes color deviation within a partial viewing angle range, especially a large viewing angle range. For OLED, the normal viewing angle or the viewing angle close to the normal viewing angle is usually called the small viewing angle. The normal viewing angle refers to the viewing angle corresponding to facing the screen directly; the viewing angle when facing the screen sideways is called the large viewing angle. Generally, the normal viewing angle is 0 degrees, and the large viewing angle range can be 40 degrees to 70 degrees. Of course, the large viewing angle range can also be defined according to actual conditions.

[0022] In view of this, the present application provides a display panel and a manufacturing method thereof, and a display device to solve the problem of color shift in a certain viewing angle range of existing display panels.

[0023] It should be noted that an organic electroluminescent device (OLED) is a device that emits light through current. Specifically, an OLED comprises functional layers such as a cathode, an anode, and a light-emitting layer located between the cathode and anode. When voltage is applied, electrons from the cathode and holes from the anode migrate to the light-emitting layer and combine to form excitons, which in turn emit light of different wavelengths depending on the characteristics of the light-emitting layer.

[0024] Figure 1 This is a schematic diagram of the planar structure of a display panel provided in one embodiment of the present application. Figure 2 for Figure 1 FIG. 1 is a schematic diagram of a cross-sectional structure of a display panel along cutting line AA′. Figure 3 This is a schematic diagram of the structure of the light emitting unit provided in one embodiment of the present application. Figures 1 to 3 As shown, the display panel of this embodiment includes: a substrate 10 and a pixel defining layer 13 arranged on one side of the substrate 10, the pixel defining layer 13 includes a plurality of pixel openings 12, and a light-emitting unit 11 is arranged in the pixel opening 12. There are multiple pixel openings 12 arranged on the pixel defining layer 13, and the multiple pixel openings 12 can be arranged in an array. A light-emitting unit 11 is arranged in each pixel opening 12, and the pixel defining layer 13 is used to separate the light-emitting units 11. The light-shielding layer 14 is located on the side of the pixel defining layer 13 away from the substrate 10, and the light-shielding layer 14 includes a plurality of first openings 15 corresponding to the pixel openings 12. The light-shielding layer 14 is used to block the light of a predetermined viewing angle emitted by the light-emitting unit 11.

[0025] In actual applications, the shading layer 14 can be set based on the light output rate and the degree of color deviation of the light output, thereby determining the angle of the predetermined viewing angle of the outgoing light. Among them, when the line of sight is perpendicular to the display panel, the viewing angle is 0 degrees, and when the line of sight is parallel to the display panel, the viewing angle is 90 degrees. The predetermined viewing angle can be any value between 0 and 90 degrees. Of course, the predetermined viewing angle can also represent a preset viewing angle range. For example, when the predetermined viewing angle is set to a viewing angle greater than 60 degrees, the predetermined viewing angle represents a viewing angle range of 60 to 90 degrees. The predetermined viewing angle in the embodiment of the present application can be set according to the actual situation of the shading layer 14, and no specific limitation is made to this.

[0026] Specifically, if Figure 2 As shown, the light-shielding layer 14 is located on the surface of the pixel defining layer 13, the pixel opening 12 corresponds to the first opening 15 one by one, and the first opening 15 is continuously arranged around the pixel opening 12, which can ensure that the light-shielding layer 14 blocks any direction outside the pixel opening 12, that is, the light-shielding layer 14 can evenly block the light of various viewing angles emitted by the light-emitting unit 11, thereby improving the color deviation problem of the viewing angle of the display panel and improving the display effect of the display panel.

[0027] Among them, the light-shielding layer 14 can be set as a whole layer on the surface of the pixel defining layer 13, and pixel openings 12 corresponding to the first openings 15 are opened on the light-shielding layer 14. Alternatively, a plurality of independent light-shielding portions can be set on the pixel defining layer 13, and each light-shielding portion is set around the pixel opening 12, and a plurality of independent light-shielding portions form the light-shielding layer 14.

[0028] The material of the light-shielding layer 14 can be a light-absorbing material that can absorb light within a predetermined viewing angle range emitted by the light-emitting unit 11. The material of the light-shielding layer 14 can also be an organic material or an inorganic material other than metal, which can change the optical path of light within the predetermined viewing angle range emitted by the light-emitting unit 11. For example, the light-shielding layer 14 can be formed using an organic photoresist, such as polyimide (PI) or polyethylene terephthalate (PET), thereby achieving the effect of improving color shift.

[0029] For example, the substrate 10 may be a rigid substrate such as a glass substrate or a silicon substrate, or a flexible substrate such as stainless steel (SUS) or flexible polyimide (PI). Furthermore, the display panel in the embodiment of the present application may be a rigid display panel that is not bendable, or a flexible display panel that is bendable.

[0030] In some embodiments, continuing as Figure 2 As shown, each light emitting unit 11 further includes an anode 111 and a cathode 112. The anode 111 and the cathode 112 are arranged in a direction perpendicular to the substrate 10 (i.e. Figure 2 The light-emitting layer 113 is located between the anode 111 and the cathode 112. The light-emitting layer 113 is filled with a light-emitting material. The light-shielding layer 14 is located on the side of the cathode 112 closer to the substrate 10.

[0031] For example, the material of the anode 111 may be an oxide transparent conductive material such as indium tin oxide (ITO), indium zinc oxide (IZO), tin dioxide (SnO 2 ), zinc oxide (ZnO), or any combination thereof.

[0032] Exemplarily, the material of the cathode 112 can be metals or alloys such as magnesium (Mg), silver (Ag), aluminum (Al), aluminum-lithium (Al-Li), calcium (Ca), magnesium-indium (Mg-In), magnesium-silver (Mg-Ag), and any combination of the above materials.

[0033] In addition, the display panel also has a circuit array layer. The circuit array layer includes a plurality of driving circuits, each of which includes a driving transistor T, such as Figure 2As shown, the drain of the driving transistor T is electrically connected to the anode 111 of the light-emitting unit 11 to transmit a driving signal to the anode 111. It is understood that the cathode 112 of each light-emitting unit 11 is grounded or connected to a low-level signal so that there is a voltage difference between the anode 111 and the cathode 112 to drive the light-emitting layer 113 to emit light.

[0034] In the display panel provided in the embodiment of the present application, a light-shielding layer is provided on a side of the pixel defining layer away from the substrate. The light-shielding layer includes a plurality of first openings corresponding to the pixel openings. The light-shielding layer can block the light of a predetermined viewing angle emitted by the light-emitting unit in each light-emitting direction of the pixel opening, thereby improving the problem of color deviation within a partial viewing angle range, thereby further improving the performance of the display panel.

[0035] Figure 4 FIG. 1 is a top view of a display panel provided in one embodiment of the present application. Figure 4 As shown, the projection of the first opening 15 on the substrate 10 covers the projection of the pixel opening 12 on the substrate 10. The size of the projection of the first opening 15 on the substrate 10 can be larger than the size of the projection of the pixel opening 12 on the substrate 10, which is conducive to improving the light extraction rate.

[0036] Specifically, the projection shape of the first opening 15 on the substrate 10 is the same as the projection shape of the pixel opening 12 on the substrate 10. For example, the projection shape of the first opening 15 on the substrate 10 is a first circle, and the projection shape of the pixel opening 12 on the substrate 10 is a second circle. The first circle and the second circle have different sizes. The area of ​​the first circle is larger than the area of ​​the second circle. The centers of the first circle and the second circle may not coincide.

[0037] In other embodiments, to address the problem of uneven shielding above the pixel opening 12 , the projection of the first opening 15 on the substrate 10 may completely overlap with the projection of the pixel opening 12 on the substrate 10 , thereby ensuring uniform shielding above the pixel opening 12 .

[0038] In the display panel provided in the embodiment of the present application, a light-shielding layer is arranged on a side of the pixel defining layer away from the substrate, and the light-shielding layer includes a plurality of first openings corresponding to the pixel openings. The projections of the first openings on the substrate cover the projections of the pixel openings on the substrate, so that the first openings on the light-shielding layer can block the light within a predetermined viewing angle range emitted by the light-emitting unit in the pixel opening, thereby improving the problem of color deviation within a partial viewing angle range and further improving the performance of the display panel.

[0039] Figure 5 FIG. 1 is a top view of a display panel provided in another embodiment of the present application. Figure 5 As shown, the projection center of the first opening 15 on the substrate 10 coincides with the projection center of the pixel opening 12 on the substrate 10 .

[0040] For example, the projection shape of the first opening 15 on the substrate 10 is a first rectangle, and the projection shape of the pixel opening 12 on the substrate 10 is a second rectangle. The sizes of the first rectangle and the second rectangle are different, but the projection center of the first opening 15 on the substrate 10 coincides with the projection center of the pixel opening 12 on the substrate 10, and the area of ​​the first rectangle is larger than the area of ​​the second rectangle.

[0041] The shapes of the first opening 15 and the pixel opening 12 can be the same or different. The shapes of the first opening 15 and the pixel opening 12 include at least one of a polygon, a circle, and an ellipse. The shapes of the multiple first openings 15 in the light shielding layer 14 can be all the same, partially the same, or all different. This application does not specifically limit the shapes of the first opening 15 and the pixel opening 12.

[0042] In some embodiments, the first opening 15 and the pixel opening 12 can be prepared using a mask having the same pattern design. The shape of the mask opening for preparing the light-shielding layer 14 is the same as the shape of the mask opening for preparing the pixel-defining layer 13. Therefore, the orthographic projection shape of the first opening 15 on the substrate 10 is the same as the orthographic projection shape of the pixel opening 12 on the substrate 10.

[0043] In the display panel provided in the embodiment of the present application, a light-shielding layer is arranged on a side of the pixel defining layer away from the substrate, and the light-shielding layer includes a plurality of first openings corresponding to the pixel openings. The projection of the first openings on the substrate covers the projection of the pixel openings on the substrate, and the projection center of the first opening on the substrate coincides with the projection center of the pixel opening on the substrate, thereby achieving the purpose of continuously arranging the first openings around the pixel openings, so that the light-shielding layer can block the light within a predetermined viewing angle range emitted by the light-emitting unit, improve the problem of color deviation within a partial viewing angle range, and further improve the performance of the display panel.

[0044] In some embodiments, the distance difference between the edge of the first opening 15 and the edge of the pixel opening 12 in at least two directions of the plane where the display panel is located meets a preset distance difference threshold.

[0045] Specifically, if Figure 5 As shown, the projection center of the first opening 15 on the substrate 10 coincides with the projection center of the pixel opening 12 on the substrate 10, the distance between the edge of the first opening 15 and the edge of the pixel opening 12 in a first direction on the plane where the display panel is located is R1, and the distance between the edge of the first opening 15 and the edge of the pixel opening 12 in a second direction on the plane where the display panel is located is R2, and the difference between R2 and R1 is less than or equal to a preset distance difference threshold. The first direction is different from the second direction.

[0046] It should be noted that the preset distance difference threshold may be 20%, or other values. It should be understood that the preset distance difference threshold may be set according to actual conditions, and this application does not impose any specific limitation thereto.

[0047] In the display panel provided in the embodiment of the present application, the distance difference between the edge of the first opening 15 and the edge of the pixel opening 12 in at least two directions on the plane where the display panel is located meets the preset distance difference threshold, which can reduce the distance difference between the shading layer 14 and the pixel opening 12 in different orientations, so that the shading of the pixel opening 12 by the shading layer 14 in different orientations is relatively consistent, further improving the problem of color deviation within a partial viewing angle range.

[0048] Figure 6 FIG. 1 is a top view of a display panel provided in another embodiment of the present application. Figure 6 As shown, the shape of the first opening 15 is the same as that of the pixel opening 12 , and the distance between the edge of the first opening 15 and the edge of the pixel opening 12 in any direction on the plane where the display panel is located is equal.

[0049] Specifically, the projection shape of the first opening 15 on the substrate 10 is a first circle, and the projection shape of the pixel opening 12 on the substrate 10 is a second circle, that is, the shape of the first opening 15 is the same as the shape of the pixel opening 12, the sizes of the first circle and the second circle are different, the centers of the first circle and the second circle coincide, and the distance R between the edge of the first opening 15 and the edge of the pixel opening 12 in any direction of the plane where the display panel is located is equal.

[0050] It should be understood that the value of the distance R between the edge of the first opening 15 and the edge of the pixel opening 12 in any direction of the plane where the display panel is located can be specified according to actual conditions, and this application does not make any specific limitation on this.

[0051] The display panel provided in the embodiment of the present application sets the distance between the edge of the first opening 15 and the edge of the pixel opening 12 in any direction on the plane of the display panel to be equal, which can ensure that the distance between the shading layer 14 and the pixel opening 12 in different directions is equal, so that the shading of the pixel opening 12 by the shading layer 14 in different directions is consistent, thereby achieving the purpose of ignoring color bias.

[0052] Figure 7 FIG. 1 is a top view of a display panel provided in another embodiment of the present application. Figure 7As shown, the light shielding layer 14 further includes a plurality of second openings 16. The projections of the second openings 16 on the substrate 10 do not overlap with the projections of the pixel openings 12 on the substrate 10. The second openings 16 are for incident light, specifically, visible light. The second openings 16 are for incident light, meaning that light can pass through the second openings from the display side of the display panel toward the non-display side of the display panel. The display side of the display panel is the viewing side of the display panel when the user is using the display panel.

[0053] The projected area of ​​the second opening 16 on the substrate 10 is smaller than the projected area of ​​the first opening 15 on the substrate 10. The shape of the second opening 16 includes at least one of a polygon, a circle, an ellipse, and a triangle. The shapes of the multiple second openings 16 on the light shielding layer 14 can be the same or different. The multiple second openings 16 can be arranged in an array or an irregular arrangement on the display panel 20.

[0054] It should be understood that when the light-shielding layer 14 is set as a whole layer, multiple second openings 16 can be opened on the light-shielding layer 14, and the projection area of ​​the second opening 16 on the substrate 10 can be set according to the size of the light-shielding area in actual conditions. As long as the actual process requirements are met, this application does not specifically limit the specific position, shape and size of the second opening.

[0055] To meet the lighting requirements of the under-screen photosensitive device of the display panel, the display panel needs to have a certain light transmittance, which helps improve the light sensing precision and accuracy of the under-screen photosensitive device. The under-screen photosensitive device can be an under-screen camera, an under-screen fingerprint, etc. The photosensitive device in the under-screen photosensitive device can be arranged on the side of the light shielding layer close to the substrate. The projection of the second opening on the substrate can at least partially cover the projection of the photosensitive device on the substrate.

[0056] The display panel provided in the embodiment of the present application has a plurality of second openings 16 formed in the light-shielding layer 14. The second openings 16 are used for incident visible light. The projection of the second openings 16 on the substrate 10 does not overlap with the projection of the pixel openings 12 on the substrate 10, thereby increasing the proportion of the light-transmitting area on the light-shielding layer and relatively reducing the proportion of the non-light-transmitting area on the light-shielding layer 14, thereby preventing the light-shielding layer 14 from being too dense and affecting the transmittance of the screen.

[0057] In one embodiment, as Figure 7 As shown, the second opening 16 is located in a light-shielding region between at least two adjacent first openings 15 , and the area of ​​the light-shielding region meets a preset area threshold.

[0058] Among them, the light-shielding area can be understood as the area on the light-shielding layer 14 where the first opening 15 is not provided. A second opening 16 can be opened in the light-shielding area between two adjacent first openings 15, or a second opening 16 can be opened in the light-shielding area between four adjacent first openings 15. The second opening 16 can be opened when the area of ​​the light-shielding area meets the preset area threshold. The preset area threshold can be set according to the difficulty of the hole-opening process, the light transmittance requirements of the photosensitive device, etc. Opening the second opening 16 in the light-shielding layer 14 can prevent the light-shielding layer 14 from extending too far, thereby further improving the transmittance of the screen.

[0059] The display panel provided in the embodiment of the present application has a plurality of second openings 16 formed in the light-shielding layer 14. The second openings 16 are used for incident visible light. The second openings 16 are located in the light-shielding area between at least two adjacent first openings 15, which can increase the proportion of the light-transmitting area to a certain extent, thereby relatively reducing the proportion of the non-light-transmitting area. The openings in the light-shielding area that meet the preset area threshold can meet the manufacturing process conditions and prevent the light-shielding layer 14 from being too dense and affecting the transmittance of the screen.

[0060] In some embodiments, the display panel further includes an encapsulation structure, which includes an encapsulation cover plate and a sealing frame disposed around the periphery of the plurality of light-emitting units and bonding the substrate and the encapsulation cover plate. The light-shielding layer 14 is used to support the encapsulation cover plate. The encapsulation cover plate may be a glass cover plate, and the sealing frame may be a frit sealing frame. Consequently, the encapsulation structure may be a Frit encapsulation structure.

[0061] Specifically, the packaging structure is used to package the plurality of light-emitting units 11 and the pixel defining layer 13 on the substrate 10 to prevent water and oxygen molecules in the air from entering the light-emitting units 11 and damaging the light-emitting units 11 .

[0062] In some embodiments, the encapsulation structure may be a glass cover plate encapsulation, i.e., a seal is formed between the cover plate and the substrate 10 using a sealing material. In other embodiments, the display panel includes an encapsulation structure, which may also be a thin film encapsulation structure, i.e., an alternating arrangement of organic and inorganic thin film structures is used to seal the light-emitting unit 11.

[0063] The display panel provided in the embodiment of the present application, the packaging structure in the display panel includes a packaging cover plate and a sealing frame arranged on the periphery of multiple light-emitting units and bonding the substrate and the packaging cover plate. Since the setting range of the light-shielding layer 14 is expanded compared with the related art, especially when the light-shielding layer 14 is a whole layer, it can not only play a role in improving color deviation, but also because the setting range of the light-shielding layer 14 is expanded and the setting uniformity is improved, it can better support the packaging cover plate. Among them, the display panel includes a display area and a non-display area arranged around the display area. The supporting effect of the light-shielding layer 14 can make the total height of the display area consistent with the height of the Frit glue dripped on the glass cover plate, preventing the glass cover plate from being on the same horizontal plane and forming Newton rings with the glass substrate under the glass cover plate. In addition, the light-shielding layer 14 can also support the packaging glass cover plate to prevent black spots caused by falling balls.

[0064] In some embodiments, the light-emitting unit 11 may be a sub-pixel for emitting light of different colors. A plurality of adjacent sub-pixels constitute a pixel unit. For example, three adjacent sub-pixels constitute a pixel unit, and the three sub-pixels are respectively a red sub-pixel, a green sub-pixel, and a blue sub-pixel. For another example, four adjacent sub-pixels constitute a pixel unit, and the four sub-pixels are respectively a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel. The number, color, and arrangement of the sub-pixels in the pixel unit can be reasonably set according to actual needs. The light-emitting unit 11 can be formed by evaporation using an evaporation mask.

[0065] The light emitting unit 11 may be a red light emitting unit for emitting red light, a green light emitting unit for emitting green light, or a blue light emitting unit for emitting blue light.

[0066] The light-emitting layer 113 includes a red light-emitting layer, a green light-emitting layer, and a blue light-emitting layer. The light-emitting material of the light-emitting layer 113 can be a blue light-emitting material, thereby making the light-emitting layer 113 a blue light-emitting layer. It is understood that, depending on actual needs, the light-emitting layer 113 can also be a light-emitting layer of other colors. The light-emitting material of the light-emitting layer 113 can also be different depending on the light-emitting color requirements of the light-emitting unit 11. The light-emitting material can be an organic material or an inorganic material, and this application does not impose specific restrictions on this.

[0067] In some embodiments of the present application, the light emitting unit 11 may further include one or more of the following structures. Figure 3As shown, the light-emitting unit 11 includes, in the stacking direction of the substrate 10 (i.e., the direction in which the anode 111 points to the cathode 112), an anode 111, a hole injection layer (HIL) 116, a hole transport layer (HTL) 115, an electron blocking layer (EBL) 114, an emission layer (EML) 113, a hole blocking layer (HBL) 117, an electron transport layer (ETL) 118, an electron injection layer (EIL) 119, and a cathode layer (Cathode).

[0068] Figure 8 FIG1 is a flow chart of a method for manufacturing a display panel provided in one embodiment of the present application. Figure 8 As shown, the preparation method includes the following steps.

[0069] Step 800: provide a substrate.

[0070] Step 801: Prepare a pixel defining layer on one side of a substrate.

[0071] The pixel defining layer includes a plurality of pixel openings, and light-emitting units are arranged in the pixel openings.

[0072] Step 802 : preparing a light shielding layer on a side of the pixel defining layer away from the substrate.

[0073] The light shielding layer includes a plurality of first openings, the first openings correspond to the pixel openings, and the light shielding layer is used to shield the light of a predetermined viewing angle emitted by the light emitting unit.

[0074] In some embodiments, a planarization layer and an anode layer are formed on an array substrate, followed by a pixel-defining layer formed on the array substrate and anode layer. The pixel-defining layer can define multiple pixel openings. Next, a light-shielding layer is formed on the pixel-defining layer. On this basis, a vapor deposition mask is used to vapor-deposit the light-emitting units on the side of the anode layer away from the array substrate.

[0075] In the method for preparing a display panel provided in an embodiment of the present application, a light-shielding layer is prepared on a side of the pixel-defining layer away from the substrate. The light-shielding layer includes a plurality of first openings corresponding to the pixel openings. The light-shielding layer can block light of a predetermined viewing angle emitted by the light-emitting unit, thereby improving the problem of color deviation within a partial viewing angle range, thereby further improving the performance of the display panel.

[0076] Figure 9FIG. 1 is a schematic diagram of the structure of a display device provided by an embodiment of the present application. Figure 9 As shown, an embodiment of the present application further provides a display device 100. It is understood that the display panel 20 can be applied to the display device 100, and the display device 100 can be, for example, a mobile terminal, a tablet computer, a computer monitor, a television, a wearable device, or an information query machine, and any other product or component with a display function. The display device 100 includes the display panel 20 as described in any embodiment of the present application, and its technical principles and effects are similar, so they will not be repeated here.

[0077] The display device provided according to any embodiment of the present application and the display panel provided in the embodiment of the present application are based on the same inventive concept and have corresponding film layer structures and beneficial effects. Details not fully described in the embodiment of the display device can be found in the embodiment of the display panel and will not be repeated here.

[0078] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0079] The block diagrams of the devices, devices, equipment, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0080] It should also be noted that in the apparatus, device, and method of the present application, each component or each step can be decomposed and / or recombined, and such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0081] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0082] The above description has been provided for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A display panel, characterized in that: include: substrate; A pixel defining layer is provided on one side of the substrate, wherein the pixel defining layer includes a plurality of pixel openings, and light emitting units are provided in the pixel openings; a light shielding layer, located on a side of the pixel defining layer away from the substrate, the light shielding layer comprising a plurality of first openings corresponding to the pixel openings, and configured to shield light of a predetermined viewing angle emitted by the light emitting unit; The projection of the first opening on the substrate covers the projection of the pixel opening on the substrate; The projection center of the first opening on the substrate coincides with the projection center of the pixel opening on the substrate; wherein the distance difference between the edge of the first opening and the edge of the pixel opening in at least two directions of the plane where the display panel is located is less than or equal to a preset distance difference threshold; or, The shape of the first opening is the same as that of the pixel opening, and the distance between the edge of the first opening and the edge of the pixel opening in any direction on the plane where the display panel is located is equal.

2. The display panel according to claim 1, wherein: The light shielding layer further includes a plurality of second openings, and projections of the second openings on the substrate do not overlap with projections of the pixel openings on the substrate.

3. The display panel according to claim 2, wherein: The second opening is located in a light-shielding region between at least two adjacent first openings, and an area of ​​the light-shielding region meets a preset area threshold.

4. The display panel according to claim 1, wherein: It also includes a packaging structure, which includes a packaging cover and a sealing frame arranged at the periphery of the plurality of light-emitting units and bonding the substrate and the packaging cover. The light-shielding layer is used to support the packaging cover.

5. A method for preparing a display panel, characterized in that: include: providing a substrate; A pixel defining layer is prepared on one side of the substrate, wherein the pixel defining layer includes a plurality of pixel openings, and light-emitting units are disposed in the pixel openings; A light shielding layer is formed on a side of the pixel defining layer away from the substrate, the light shielding layer including a plurality of first openings, the first openings corresponding to the pixel openings, the light shielding layer being configured to shield light of a predetermined viewing angle emitted by the light-emitting unit, the projections of the first openings on the substrate covering the projections of the pixel openings on the substrate; and the projection centers of the first openings on the substrate coincide with the projection centers of the pixel openings on the substrate; In which, the distance difference between the edge of the first opening and the edge of the pixel opening in at least two directions of the plane where the display panel is located is less than or equal to a preset distance difference threshold; or, the shape of the first opening is the same as the shape of the pixel opening, and the distance between the edge of the first opening and the edge of the pixel opening in any direction of the plane where the display panel is located is equal.

6. A display device, characterized in that: A display panel comprising any one of claims 1 to 4.

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