Display panel and display device

Abstract

The present disclosure provides a display panel and a display device, belonging to the field of display technology, which can solve the problem that the color deviation of the central display area and the edge display area of ​​the existing display panel is inconsistent, affecting the display effect. The display panel of the present disclosure has a central display area and an edge display area arranged on at least one side of the central display area, and the display panel includes: a substrate, a plurality of light-emitting devices located on the substrate, and an encapsulation layer located on the side of the light-emitting device away from the substrate, and a black matrix located on the side of the encapsulation layer away from the substrate; the black matrix has an opening corresponding to the light-emitting device; in the edge display area, the thickness of the encapsulation layer gradually decreases along the direction away from the central display area; the light-emitting device has a first boundary close to the central display area and a second boundary away from the central display area; the opening has a third boundary corresponding to the first boundary, and a fourth boundary corresponding to the second boundary; the horizontal distance from the first boundary to the third boundary is greater than the horizontal distance from the second boundary to the fourth boundary.

Description

Technical Field

[0001] The present disclosure belongs to the field of display technology, and particularly relates to a display panel and a display device. Background Art

[0002] Organic Light-Emitting Diode (OLED) is a light-emitting device that uses organic solid-state semiconductors as light-emitting materials. It has broad application prospects due to its advantages such as simple preparation process, low cost, low power consumption, high luminous brightness, and wide operating temperature adaptability.

[0003] In OLED display panels, thin film encapsulation is generally used to encapsulate the light-emitting devices therein, and the organic encapsulation layer in the encapsulation layer can be formed by inkjet printing. However, due to process and material reasons, a certain climbing area appears in the encapsulation layer at the edge or around the opening of the OLED display panel, which causes the thickness of the encapsulation layer at the edge or around the opening of the OLED display panel to be different from the thickness of the normal central display area, which easily causes the color deviation of the edge display area and the central display area to be inconsistent, affecting the display effect. Summary of the invention

[0004] The present disclosure aims to solve at least one of the technical problems existing in the prior art and provide a display panel and a display device.

[0005] In a first aspect, an embodiment of the present disclosure provides a display panel having a central display area and an edge display area arranged on at least one side of the central display area, wherein the display panel comprises: a substrate, a plurality of light-emitting devices located on the substrate, and an encapsulation layer located on a side of the light-emitting devices away from the substrate, and a black matrix located on a side of the encapsulation layer away from the substrate; the black matrix has openings corresponding to the light-emitting devices; in the edge display area, the thickness of the encapsulation layer gradually decreases along a direction away from the central display area;

[0006] The light emitting device has a first boundary close to the central display area and a second boundary away from the central display area; the opening has a third boundary corresponding to the first boundary, and a fourth boundary corresponding to the second boundary;

[0007] A horizontal distance from the first boundary to the third boundary is greater than a horizontal distance from the second boundary to the fourth boundary.

[0008] Optionally, a difference between a horizontal distance from the first boundary to the third boundary and a horizontal distance from the second boundary to the fourth boundary is 2 micrometers to 5 micrometers.

[0009] Optionally, d+d1=di / tanα1, d+d2=di' / tanα2, wherein d1 is the horizontal distance from the first boundary to the third boundary, d2 is the horizontal distance from the second boundary to the fourth boundary, di is the distance from the black matrix to the light-emitting device corresponding to the third boundary, di' is the distance from the black matrix to the light-emitting device corresponding to the fourth boundary, d is half the width of the light-emitting device, α1 is the light output angle at the third boundary, α2 is the light output angle corresponding to the fourth boundary, wherein α1=α2.

[0010] Optionally, the encapsulation layer comprises: a first inorganic encapsulation layer, a second inorganic encapsulation layer and an organic encapsulation layer;

[0011] The first inorganic encapsulation layer is located on a side of the light emitting device away from the substrate;

[0012] The organic encapsulation layer is located on a side of the first inorganic encapsulation layer away from the substrate;

[0013] The second inorganic encapsulation layer is located on a side of the organic encapsulation layer away from the substrate.

[0014] Optionally, the display panel further comprises: a color film layer;

[0015] The color filter layer is located on a side of the black matrix away from the substrate.

[0016] Optionally, the color filter layer includes: a red color filter unit, a green color filter unit and a blue color filter unit.

[0017] Optionally, the display panel further comprises: a protective cover plate;

[0018] The protective cover is located on a side of the color filter layer away from the substrate.

[0019] Optionally, the display panel further includes: a touch electrode layer;

[0020] The touch electrode layer is located on a side of the packaging layer close to the black matrix.

[0021] Optionally, the orthographic projection of the black matrix on the substrate covers the orthographic projection of the touch electrode layer on the substrate.

[0022] Optionally, the display panel further comprises: a pixel defining layer;

[0023] The pixel defining layer is located on the substrate, and the light emitting device is located in a region defined by the pixel defining layer.

[0024] In a second aspect, an embodiment of the present disclosure provides a display device, which includes a display panel as provided above. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of an exemplary display panel.

[0026] Figure 2a for Figure 1 The cross-sectional structure diagram of the display panel along the AA' direction is shown.

[0027] Figure 2b for Figure 1 The cross-sectional structure diagram of the display panel along the BB' direction is shown.

[0028] Figure 3a for Figure 2a A schematic diagram of a viewing angle brightness attenuation curve of light from a display panel is shown.

[0029] Figure 3b for Figure 2b A schematic diagram of a viewing angle brightness attenuation curve of light from a display panel is shown.

[0030] Figure 4 A schematic diagram of the structure of a display panel provided in an embodiment of the present disclosure.

[0031] Figure 5 for Figure 4 A schematic diagram of a viewing angle brightness attenuation curve of light from a display panel is shown. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0033] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0034] At present, OLED display panels have been widely used in the display field due to their self-luminous, low power consumption, and rollability. In order to reduce power consumption and achieve good rollability, many OLED display panels use a color film (CF) and a black matrix (BM) instead of a polarizer to filter light (color filter on encapsulation, COE). The main function of the black matrix is ​​to reduce the reflectivity of the light-emitting device.

[0035] Figure 1 is a schematic diagram of an exemplary structure of a display panel, such as Figure 1 As shown, the display panel has a central display area and an edge display area arranged on at least one side of the central display area. The edge display area can be arranged at the edge of the display panel or around the opening of the display panel. A camera, a receiver, or other devices for non-display functions can be formed in the opening. For ease of understanding, the edge display area arranged around the opening is used as an example for explanation in this disclosure. The structure and implementation principle of the edge display area arranged at the edge of the display panel are the same and will not be described in detail.

[0036] Figure 2a for Figure 1 The cross-sectional structure diagram of the display panel along the AA' direction is shown in FIG. Figure 2b for Figure 1 The cross-sectional structure diagram of the display panel along the BB' direction is shown in FIG. Figure 2a and Figure 2b The display panel shown includes: a substrate 101, a plurality of light emitting devices 102 located on the substrate 101, and an encapsulation layer 103 located on a side of the light emitting devices 102 away from the substrate 101, and a black matrix 104 located on a side of the encapsulation layer 103 away from the substrate 101, wherein the black matrix 104 has openings arranged corresponding to the light emitting devices 102. The display panel also includes: a color filter layer 105 located on a side of the black matrix 104 away from the substrate 101.

[0037] Due to the limitation of process and materials, the encapsulation layer has a certain slope area (generally in the range of 2 mm), which causes the thickness of the encapsulation layer in the edge display area to be different from that in the normal central display area. Figure 2a In the edge display area, the thickness of the encapsulation layer 103 gradually decreases in the direction away from the central display area (as shown in Figure 2b ).

[0038] The light emitted by the light emitting device 102 passes through the multi-layer structure in the encapsulation layer 103 and the color filter layer 105. Due to the different refractive indices of the materials in each layer, the light is refracted to a certain extent. In the central display area, the encapsulation layer 103 is flattened, and the light viewing angle brightness attenuation curve L-decay is symmetrically distributed (e.g. Figure 3a As shown in FIG. 1 , in the edge display area, the thickness of the encapsulation layer 103 gradually decreases in the direction away from the central display area, and the viewing angle brightness attenuation curve L-decay of the light is asymmetrically distributed (as shown in FIG. 1 ). Figure 3b As shown in FIG. 1 , the color deviation between the edge display area and the center display area is likely to be inconsistent, which affects the display effect.

[0039] In order to solve at least one of the above-mentioned technical problems, the embodiments of the present disclosure provide a display panel and a display device. The display panel and the display device provided by the embodiments of the present disclosure will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0040] Figure 4 A schematic diagram of the structure of a display panel provided in an embodiment of the present disclosure is shown in FIG. Figure 4 As shown in FIG. 1 , the display panel includes: a substrate 101, a plurality of light emitting devices 102 located on the substrate 101, an encapsulation layer 103 located on the side of the light emitting devices 102 away from the substrate 101, and a black matrix 104 located on the side of the encapsulation layer 103 away from the substrate 101; the black matrix 104 has openings corresponding to the light emitting devices 102. In the central display area, the structure of the display panel is similar to that of FIG. Figure 2a The structure shown is the same. In the edge display area, the thickness of the encapsulation layer 103 gradually decreases along the direction away from the central display area; the light emitting device 102 has a first boundary close to the central display area and a second boundary away from the central display area; the opening has a third boundary corresponding to the first boundary, and a fourth boundary corresponding to the second boundary; the horizontal distance d1 from the first boundary to the third boundary is greater than the horizontal distance d2 from the second boundary to the fourth boundary.

[0041] The substrate 101 can be made of a rigid material such as glass, which can improve the bearing capacity of the substrate 101 for other film layers thereon. Of course, the substrate 101 can also be made of a flexible material such as polyimide (PI), which can improve the overall bending and stretching resistance of the display panel, and avoid the stress generated during bending, stretching, and twisting that causes the substrate 101 to break and cause a short circuit. In practical applications, the material of the substrate 101 can be reasonably selected according to actual needs to ensure that the display panel has good performance. A buffer layer is generally provided between the substrate 101 and the light-emitting diode 102, and its material can be at least one of silicon nitride, silicon oxide, or silicon oxynitride.

[0042] The light emitting device 102 may include a first electrode and a second electrode arranged opposite to each other, and an organic light emitting layer located between the first electrode and the second electrode. The polarities of the first electrode and the second electrode are opposite, wherein the first electrode may be specifically an anode of the light emitting device 102, and the anode may be made of at least one of metal materials such as silver (Ag), aluminum (Al), and titanium (Ti). The second electrode may be specifically a cathode of the light emitting device 102, and the cathode may be made of transparent conductive materials such as indium tin oxide (ITO) and indium zinc oxide (IZO) to improve the overall transparency of the display panel. Both the anode and the cathode may be a single-layer structure made of the above-mentioned single material, or a multi-layer structure made of the above-mentioned multiple materials, which may be selected according to actual needs. The organic light emitting layer may be made of a fluorescent material, and may emit light under the action of the electric field between the anode and the cathode to realize the display function.

[0043] The encapsulation layer 103 can encapsulate the organic light-emitting layer in the light-emitting device 102 to prevent the intrusion of gases such as water and oxygen from the outside, which may cause the material of the organic light-emitting layer to be corroded. Generally, the encapsulation layer 103 is made of a multi-layer structure, which includes an inorganic encapsulation layer and an organic encapsulation layer. The inorganic encapsulation layer can block gases such as water and oxygen. The organic encapsulation layer has good flexibility and can be filled between the inorganic encapsulation layers to play a buffering role, thereby preventing the overall encapsulation layer 103 from breaking under the action of external force and causing encapsulation failure.

[0044] The black matrix 104 can be made of black light-shielding material, and the black matrix 104 is provided with openings corresponding to the light-emitting devices 102, and the openings can transmit the light emitted by the light-emitting devices 102 to the user's field of vision. At the same time, the black matrix 104 can block the light emitted by the light-emitting devices 102 to prevent the light emitted by adjacent light-emitting devices 102 from mixing and causing crosstalk, so as to improve the display effect.

[0045] In the display panel provided by the embodiment of the present disclosure, the horizontal distance d1 from the first boundary of the light emitting device 102 to the third boundary of the opening is greater than the horizontal distance d2 from the second boundary of the light emitting device 102 to the fourth boundary of the opening, and the opening of the black matrix 104 is asymmetrically distributed relative to the light emitting device 102, so that the viewing angles of both sides of the light emitted from the opening are equal, so that the viewing angle brightness decay curve L-decay of the light in the edge display area can be symmetrically distributed (such as Figure 5 As shown in the figure, it is the same as the viewing angle brightness attenuation curve L-decay of the light in the central display area, thereby ensuring that the color cast of the display panel in the edge display area and the central display area is the same, thereby improving the display effect and the user experience.

[0046] In some embodiments, a difference between a horizontal distance d1 from the first boundary to the third boundary and a horizontal distance d2 from the second boundary to the fourth boundary is 2 micrometers to 5 micrometers.

[0047] Specifically, the slope area of ​​the edge display area of ​​a general display panel is 2 mm. In the slope area, the thickness of the encapsulation layer 103 gradually decreases in the direction away from the central display area. The opening of the black matrix 104 can be set differently, so that the difference between the horizontal distance d1 from the first boundary to the third boundary and the horizontal distance d2 from the second boundary to the fourth boundary is 2 to 5 microns. Since the thickness of the encapsulation layer 103 at different positions is different, the openings of the black matrix 104 at different positions are also different. It can be specifically set according to actual needs, and will not be listed here one by one. You can refer to Figure 4 , d+d1=di / tanα1, d+d2=di' / tanα2, wherein d1 is the horizontal distance from the first boundary to the third boundary, d2 is the horizontal distance from the second boundary to the fourth boundary, di is the distance from the black matrix 104 to the light-emitting device 104 corresponding to the third boundary, di' is the distance from the black matrix 104 to the light-emitting device 102 corresponding to the fourth boundary, d is half the width of the light-emitting device 102, α1 is the light output angle corresponding to the third boundary, α2 is the light output angle corresponding to the fourth boundary, wherein α1=α2, since di and di' are different, in order to ensure α1=α2, it is necessary to set the sizes of d1 and d2 to be different, specifically d1>d2, so that the viewing angle brightness attenuation curve L-decay can be symmetrically distributed.

[0048] In some embodiments, Figure 4 As shown, the encapsulation layer 103 includes: a first inorganic encapsulation layer 1031, a second inorganic encapsulation layer 1032 and an organic encapsulation layer 1033; the first inorganic encapsulation layer 1031 is located on the side of the light-emitting device 102 away from the substrate 101; the organic encapsulation layer 1033 is located on the side of the first inorganic encapsulation layer 1031 away from the substrate 101; the second inorganic encapsulation layer 1032 is located on the side of the organic encapsulation layer 1033 away from the substrate 101.

[0049] The first inorganic encapsulation layer 1031 can be formed by chemical vapor deposition using inorganic materials, and a gaseous reactant or liquid reactant containing inorganic materials and other required reaction gases are introduced into the reaction chamber to deposit a thin film on the cathode of the light-emitting device 102. It can cover the organic light-emitting layer in the light-emitting device 102 to prevent the intrusion of gases such as water and oxygen from damaging the organic light-emitting layer. The second inorganic encapsulation layer 1032 can be formed using the same material and method as the first inorganic encapsulation layer 1031 described above. The principle is the same as above and will not be described in detail here. The organic encapsulation layer 1033 can be formed by inkjet printing using organic materials, and its function is to flatten the surface of the first inorganic encapsulation layer 1031. If the encapsulation layer 103 is made of inorganic materials, it is brittle and is prone to breakage when affected by external forces, causing encapsulation failure. The organic encapsulation layer 1033 has good flexibility and can be filled between the first inorganic encapsulation layer 1031 and the second inorganic encapsulation layer 1032 to play a buffering role, thereby preventing the entire encapsulation layer 103 from breaking under the action of external force and causing encapsulation failure. It is understandable that in addition to the above-mentioned three-layer structure, the encapsulation layer 103 can also adopt a four-layer, five-layer or other layer structure, which is not listed here one by one. In actual applications, due to the strong material fluidity of the organic encapsulation layer 1033, the thickness of the organic encapsulation layer 1033 in the edge display area gradually decreases in the direction away from the center display area, resulting in the overall thickness of the encapsulation layer 103 gradually decreasing in the direction away from the center display area.

[0050] In some embodiments, the display panel further includes: a color filter layer 105 ; the color filter layer 105 is located on a side of the black matrix 104 away from the substrate 101 .

[0051] The color filter layer 105 can cover the opening of the black matrix 104, and the color filter layer 105 can filter the light emitted by the light emitting device 102 to form monochromatic light, for example, red light, green light and blue light. At the same time, the color filter layer 105 combined with the black matrix 104 can replace the polarizer to play the role of filtering, so that the display panel does not need to be provided with a polarizer to prevent the reflection of the anode of the light emitting device 102, so the thickness of the display screen can be reduced, which is conducive to the thinness of the display panel and improves the user experience. Specifically, this color filter layer 105 may include: a red color filter unit, a green color filter unit and a blue color filter unit. The red color filter unit can convert the white light emitted by the light emitting device 102 into red light, the green color filter unit can convert the white light emitted by the light emitting device into green light, and the blue color filter unit can convert the light emitted by the light emitting device into blue light, so that the display panel can achieve a colorful display.

[0052] In some embodiments, Figure 4As shown, the display panel further includes: a protection cover plate 106 ; the protection cover plate 106 is located on the side of the color filter layer 105 away from the substrate 101 .

[0053] The protective cover plate 106 can be made of a rigid material such as glass, which can protect other film layers covered by the protective cover plate 106 to prevent external stress from damaging other film layers in the display panel. Of course, the protective cover plate 106 can also be made of a flexible material such as polyimide (PI), which can improve the overall bending and stretching resistance of the display panel and prevent the stress generated during bending, stretching, and twisting from causing the protective cover plate 106 to break. In practical applications, the material of the protective cover plate 106 can be reasonably selected according to actual needs to ensure that the display panel has good performance.

[0054] In some embodiments, Figure 4 As shown, the display panel further includes: a touch electrode layer 107 ; the touch electrode layer 107 is located on a side of the encapsulation layer 103 close to the black matrix 104 .

[0055] The touch electrode layer 107 can adopt a self-capacitive capacitor structure or a mutual-capacitive capacitor structure. The touch electrode layer 107 can be connected to the corresponding signal line. When the user's finger touches the touch electrode 107, the capacitance value in the self-capacitive capacitor structure or the mutual-capacitive capacitor structure will change to determine the location where the touch occurs, so that the display panel can realize the touch function.

[0056] In some embodiments, Figure 4 As shown, the orthographic projection of the black matrix 104 on the substrate 101 covers the orthographic projection of the touch electrode layer 107 on the substrate 101 .

[0057] The touch electrode 107 may be covered by the black matrix 104 , so as to prevent the touch electrode 107 from blocking the light emitted by the light emitting device 102 and affecting the display effect.

[0058] In some embodiments, Figure 4 As shown, the display panel further includes: a pixel defining layer 108 ; the pixel defining layer 108 is located on the substrate 101 , and the light emitting device 102 is located in the area defined by the pixel defining layer 108 .

[0059] The pixel defining layer 108 can form a pixel pit, and the organic light-emitting layer material of the light-emitting device 102 can be injected into the pixel pit by inkjet printing. At the same time, the pixel defining layer 108 can also prevent organic light-emitting layer materials of different colors from contaminating each other and causing cross-color. It should be noted that in actual applications, the light-emitting device 102 can also exceed the area defined by the pixel defining layer 108, and the light-emitting area of ​​the light-emitting device 102 is also defined by the pixel defining layer 108.

[0060] In the second aspect, an embodiment of the present disclosure provides a display device, which includes a display panel as provided in any of the above embodiments. The display device can specifically be: a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, or any other product or component with a display function. Its implementation principle and beneficial effects are the same as those of the above-mentioned display panel, and will not be repeated here.

[0061] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A display panel comprising a central display area and an edge display area arranged on at least one side of the central display area, characterized in that: The display panel comprises: a substrate, a plurality of light-emitting devices on the substrate, an encapsulation layer on a side of the light-emitting devices away from the substrate, and a black matrix on a side of the encapsulation layer away from the substrate; the black matrix has openings corresponding to the light-emitting devices; in the edge display area, the thickness of the encapsulation layer gradually decreases along a direction away from the central display area; The light emitting device has a first boundary close to the central display area and a second boundary away from the central display area; the opening has a third boundary corresponding to the first boundary, and a fourth boundary corresponding to the second boundary; The horizontal distance from the first boundary to the third boundary is greater than the horizontal distance from the second boundary to the fourth boundary; A difference between a horizontal distance from the first boundary to the third boundary and a horizontal distance from the second boundary to the fourth boundary is 2 micrometers to 5 micrometers; d+d1=di / tanα1, d+d2=di' / tanα2, wherein d1 is the horizontal distance from the first boundary to the third boundary, d2 is the horizontal distance from the second boundary to the fourth boundary, di is the distance from the black matrix to the light-emitting device corresponding to the third boundary, di' is the distance from the black matrix to the light-emitting device corresponding to the fourth boundary, d is half the width of the light-emitting device, α1 is the light emission angle at the third boundary, α2 is the light emission angle corresponding to the fourth boundary, wherein α1=α2.

2. The display panel according to claim 1, characterized in that: The encapsulation layer comprises: a first inorganic encapsulation layer, a second inorganic encapsulation layer and an organic encapsulation layer; The first inorganic encapsulation layer is located on a side of the light emitting device away from the substrate; The organic encapsulation layer is located on a side of the first inorganic encapsulation layer away from the substrate; The second inorganic encapsulation layer is located on a side of the organic encapsulation layer away from the substrate.

3. The display panel according to claim 1, characterized in that: The display panel further includes: a color film layer; The color filter layer is located on a side of the black matrix away from the substrate.

4. The display panel according to claim 3, characterized in that: The color filter layer includes: a red color filter unit, a green color filter unit and a blue color filter unit.

5. The display panel according to claim 3, characterized in that: The display panel further includes: a protective cover plate; The protective cover is located on a side of the color filter layer away from the substrate.

6. The display panel according to claim 1, characterized in that: The display panel further includes: a touch electrode layer; The touch electrode layer is located on a side of the packaging layer close to the black matrix.

7. The display panel according to claim 6, characterized in that: The orthographic projection of the black matrix on the substrate covers the orthographic projection of the touch electrode layer on the substrate.

8. The display panel according to claim 1, characterized in that: The display panel further includes: a pixel defining layer; The pixel defining layer is located on the substrate, and the light emitting device is located in a region defined by the pixel defining layer.

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

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