Display panel and display device

Abstract

The utility model provides a display panel and a display device, and relates to the technical field of display. The display panel comprises a driving backboard, a first electrode, a light-emitting device and a second electrode, the first electrode, the light-emitting device and the second electrode are sequentially arranged on the driving backboard in a stacked mode, the display panel further comprises a reflecting film, and the reflecting film is arranged on the side, facing the driving backboard, of the first electrode and / or the side, away from the driving backboard, of the second electrode; the reflecting film comprises a plurality of first sub-film layers and a plurality of second sub-film layers, the first sub-film layers and the second sub-film layers are alternately arranged in the direction perpendicular to the driving backboard, and the refractive index of the first sub-film layers is larger than that of the second sub-film layers. And the peep-proof function is realized on the premise of considering the front-view brightness.

Description

Technical Field

[0001] The present disclosure relates to the field of display technologies, and in particular, to a display panel and a display device. Background Art

[0002] Organic Light-Emitting Diode (OLED) display panels have been increasingly widely used due to their advantages such as being thin, light, low-power consumption, high brightness, bendable, and capable of displaying pure black. For example, OLED display panels are applied to display devices such as mobile phones and automotive center consoles.

[0003] Some display devices have an anti-peeping function. However, the brightness of existing display devices with an anti-peeping function is relatively low when viewed directly, which affects the user experience. Summary of the Utility Model

[0004] Embodiments of the present disclosure provide a display panel and a display device, which achieve an anti-peeping function while taking into account the brightness when viewed directly.

[0005] To achieve the above object, the embodiments of the present disclosure adopt the following technical solutions:

[0006] On the one hand, a display panel is provided. The display panel includes a driving backplane, a first electrode, a light-emitting device, and a second electrode that are sequentially stacked on the driving backplane. The display panel further includes a reflective film, and the reflective film is disposed on one side of the first electrode facing the driving backplane and / or on one side of the second electrode away from the driving backplane; the reflective film includes a plurality of first sub-film layers and a plurality of second sub-film layers, the first sub-film layers and the second sub-film layers are alternately disposed along a direction perpendicular to the driving backplane, and the refractive index of the first sub-film layer is greater than that of the second sub-film layer.

[0007] In some embodiments, the reflective film includes a first reflective film, the first reflective film is disposed on one side of the first electrode facing the driving backplane, and when the light-emitting device is a green light-emitting device or a blue light-emitting device, the first sub-film layer closest to the first electrode in the first reflective film.

[0008] In some embodiments, the reflective film includes a first reflective film, the first reflective film is disposed on one side of the first electrode facing the driving backplane, and when the light-emitting device is a red light-emitting device, the second sub-film layer closest to the first electrode in the first reflective film.

[0009] In some embodiments, the reflective film includes a first reflective film disposed on a side of the first electrode facing the driving backplane, and the sum of the number of the first sub-film layers and the second sub-film layers in the first reflective film is greater than or equal to 16.

[0010] In some embodiments, the reflective film includes a first reflective film disposed on a side of the first electrode facing the driving backplane, and the central wavelength of the first reflective film is greater than the emission central wavelength of the light-emitting device, and the difference is greater than or equal to 15 nm and less than or equal to 45 nm.

[0011] In some embodiments, the reflective film includes a second reflective film disposed on a side of the second electrode away from the driving backplane, and the sum of the number of the first sub-film layers and the second sub-film layers in the second reflective film is odd.

[0012] In some embodiments, the first sub-film layer closest to the second electrode in the second reflective film is the first sub-film layer.

[0013] In some embodiments, the sum of the number of the first sub-film layers and the second sub-film layers in the second reflective film is greater than or equal to 7.

[0014] In some embodiments, the central wavelength of the second reflective film is greater than the emission central wavelength of the light-emitting device, and the difference is greater than or equal to 50 nm and less than or equal to 90 nm.

[0015] In some embodiments, the thicknesses of the first sub-film layers are the same and the refractive indices are the same, and / or the thicknesses of the second sub-film layers are the same and the refractive indices are the same.

[0016] In some embodiments, the thickness of the first sub-film layer is d1, d1 = λ / (4*n1); and / or the thickness of the second sub-film layer is d2, d2 = λ / (4*n2); where n1 is the refractive index of the first sub-film layer, n2 is the refractive index of the second sub-film layer, and λ is the central wavelength of the reflective film.

[0017] In some embodiments, the first electrode and / or the second electrode is a transparent electrode.

[0018] In some embodiments, the display panel further includes a viewing angle switching layer located on a side of the second electrode away from the driving backplane.

[0019] On the other hand, a display device is provided, and the display device includes the display panel described above.

[0020] In the display panel provided by the embodiments of the present disclosure, the display panel further includes a reflective film. The reflective film is disposed on one side of the first electrode facing the driving backplane and / or on one side of the second electrode away from the driving backplane. The reflective film includes a plurality of first sub-film layers and a plurality of second sub-film layers. The first sub-film layers and the second sub-film layers are alternately disposed along a direction perpendicular to the driving backplane, and the refractive index of the first sub-film layer is greater than that of the second sub-film layer. When the reflective film is disposed on one side of the first electrode facing the driving backplane and the second reflective film is disposed on one side of the second electrode away from the driving backplane, the two reflective films are opposite and spaced apart. The first electrode, the light-emitting device, and the second electrode are located between the two reflective films, so that a microcavity is formed between the two reflective films. According to the microcavity effect, the microcavity can enhance the intensity of the light at a small viewing angle and suppress the light at a large viewing angle. When the light at a small viewing angle is enhanced, the frontal brightness of the display panel can be improved. When the light at a large viewing angle is suppressed, the viewing angle of the display panel can be narrowed, thereby realizing the anti-peeping function. That is, the anti-peeping function can be realized while taking into account the frontal brightness. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 The front view structure of a display device provided by an embodiment of the present disclosure;

[0023] Figure 2 The cross-sectional view of a display panel provided by an embodiment of the present disclosure;

[0024] Figure 3 The cross-sectional view of a display panel in the related art;

[0025] Figure 4 The cross-sectional view of a reflective film provided by an embodiment of the present disclosure;

[0026] Figure 5 The cross-sectional view of another reflective film provided by an embodiment of the present disclosure;

[0027] Figure 6 The cross-sectional view of another display panel provided by an embodiment of the present disclosure;

[0028] Figure 7 The viewing angle brightness normalization diagram;

[0029] Figure 8 The curve diagram of the brightness of each color in the type II display panel;

[0030] Figure 9 It is a curve graph of the brightness of each color in the type III display panel;

[0031] Figure 10 It is a cross-sectional view of another display panel provided by an embodiment of the present disclosure;

[0032] Figure 11 It is a preparation flow chart of the display panel.

[0033] Reference numerals:

[0034] 1000 - Display device;

[0035] 10 - Driving backplane;

[0036] 20 - Reflective film; 21 - First reflective film; 22 - Second reflective film; 201 - First sub - film layer; 201 - Second sub - film layer;

[0037] 30 - First electrode;

[0038] 40 - Light - emitting device;

[0039] 50 - Second electrode;

[0040] 60 - Encapsulation layer;

[0041] 70 - Color filter layer;

[0042] 80 - Protective layer;

[0043] 90 - Viewing - angle switching layer. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present disclosure.

[0045] In the embodiments of the present disclosure, terms such as "first", "second", "third", "fourth", etc. are used to distinguish the same or similar items with basically the same functions and roles, only for clearly describing the technical solutions of the embodiments of the present disclosure, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features.

[0046] In the embodiments of the present disclosure, the meaning of "a plurality of" is two or more, and the meaning of "at least one" is one or more, unless otherwise clearly and specifically defined.

[0047] In an embodiment of the present disclosure, the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present disclosure.

[0048] Figure 1 This is a front view structure of a display device provided by an embodiment of the present disclosure. As Figure 1 shown, some embodiments of the present disclosure provide a display device 1000. The display device 1000 can be any device with a display function. For example, the display device 1000 can be a mobile phone, a wireless device, a personal digital assistant (PDA), a handheld or portable computer, a GPS receiver / navigator, a camera, an MP4 video player, a video camera, a game console, a watch, a clock, a calculator, a television monitor, a flat panel display, a computer monitor, an automotive display (such as an odometer display, etc.), a navigator, a cockpit controller and / or display, a display of a camera view (such as a display of a rear view camera in a vehicle), an electronic photo, an electronic billboard or sign, a projector, a building structure, a packaging and aesthetic structure (such as a display of an image of a piece of jewelry), etc. Figure 1 Here, the display device 1000 is taken as an example of an automotive center control display device for illustration. For example, the display device 1000 is located at the center console of the vehicle and is used to display multimedia information, navigation information, air conditioning information, etc. of the vehicle.

[0049] Figure 2 This is a cross-sectional view of a display panel provided by an embodiment of the present disclosure. As Figure 2 shown, the display device 1000 includes a display panel 100, and an image is displayed through the display panel 100.

[0050] Continuing to refer to Figure 2 , the display panel 100 includes a driving backplane 10. The driving backplane 10 may include a substrate and a plurality of film layers stacked on the substrate. The plurality of film layers may include a patterned semiconductor film layer and a patterned conductive film layer. The patterned semiconductor film layer and the patterned conductive film layer together form a pixel driving circuit. The specific film layer composition of the driving backplane 10 and the specific circuit structure of the pixel driving circuit are not limited in the embodiments of the present disclosure.

[0051] Among them, the substrate is used to support and connect other film layer structures of the driving backplane 10. The substrate can be a rigid substrate or a flexible substrate, and can be flexibly selected according to needs in actual applications. Exemplarily, the substrate is a rigid substrate. For example, the substrate can be a glass substrate or a polymethyl methacrylate (PMMA) substrate, etc. Exemplarily, the substrate is a flexible substrate. For example, the substrate can be a polyethylene terephthalate (PET) substrate, a polyethylene naphthalate twoformic acid glycol ester (PEN) substrate, or a polyimide (PI) substrate, etc. The substrate can be a single-layer structure or a composite structure formed by laminating multiple layers. When the substrate is a composite structure, the multiple layers in the substrate can be any one or more of the above rigid substrates and flexible substrates.

[0052] Continuing to refer to Figure 2 , the display panel further includes a first electrode 30, a light-emitting device 40, and a second electrode 50 that are sequentially stacked on the driving backplane 10. The first electrode 30 is closer to the driving backplane 10 than the second electrode 50. Exemplarily, the first electrode 30 is disposed on the surface of the driving backplane 10 away from the substrate and is electrically connected to the pixel driving circuit. Among them, the first electrode 30 can be an anode, and the second electrode 50 can be a cathode. Of course, the embodiments of the present disclosure do not limit this.

[0053] The first electrode 30 and the second electrode 50 can be disposed opposite to each other, and the light-emitting device 40 is located between the first electrode 30 and the second electrode 50. Among them, the display panel includes a plurality of light-emitting devices 40, and each light-emitting device 40 can be provided with a corresponding first electrode 30 and second electrode 50. For example, the display panel includes a red light-emitting device 40, a green light-emitting device 40, and a blue light-emitting device 40. The red light-emitting device 40 emits red light, the green light-emitting device 40 emits green light, and the blue light-emitting device 40 emits blue light. The display panel is provided with a first electrode 30 and a second electrode 50 corresponding to the red light-emitting device 40, and is also provided with a first electrode 30 and a second electrode 50 corresponding to the green light-emitting device 40, and is also provided with a first electrode 30 and a second electrode 50 corresponding to the blue light-emitting device 40.

[0054] When the display panel is working, the light-emitting device 40 emits light under the current drive between the first electrode 30 and the second electrode 50. When emitting light, it can emit small-angle light or large-angle light. Small-angle light refers to light with a small angle between the normal line of the light-emitting surface, and large-angle light refers to light with a large angle between the normal line of the light-emitting surface. For example, light with an angle of 0 with the normal line of the light-emitting surface (frontal light) is small-angle light, and light with an angle of 57° with the normal line of the light-emitting surface is large-angle light.

[0055] When the user is facing or approaching the display panel head-on, the user's eyes can view the image displayed on the display panel by receiving small-angle light. When the user is not facing the display panel head-on, the user's eyes can view the image displayed on the display panel by receiving large-angle light. To achieve the anti-peeping function, it is necessary to reduce the large-angle light emitted by the display panel. When the user is not facing the display panel head-on, since the user cannot receive large-angle light or receives less large-angle light, the user cannot normally view the image displayed on the display panel, thus achieving the anti-peeping display function.

[0056] To reduce the large-angle light emitted by the display panel, the method commonly used in the related art is to attach an anti-peeping film to the surface of the display panel to filter the large-angle light through the anti-peeping film. Figure 3 It is a cross-sectional view of a display panel in the related art. As Figure 3 shown, the display panel in the related art further includes an anti-peeping film. The anti-peeping film is disposed on the side of the protective layer 80 away from the driving backplane 10 for absorbing large-angle light. However, the anti-peeping film not only absorbs large-angle light but also absorbs a part of small-angle light, resulting in a decrease in the frontal brightness of the display panel. For example, the transmittance of some anti-peeping films is 65%, that is, only 65% of the small-angle light passes through the anti-peeping film, reducing the frontal brightness of the display panel.

[0057] In view of this, the embodiments of the present disclosure provide a new display panel, which realizes anti-peeping display while taking into account the frontal brightness.

[0058] Continuing to refer to Figure 2 , the display panel further includes a reflective film 20. The reflective film 20 can be disposed on the side of the first electrode 30 facing the driving backplane 10, or on the side of the second electrode 50 away from the driving backplane 10, or the reflective film 20 can be disposed on the side of the first electrode 30 facing the driving backplane 10 and on the side of the second electrode 50 away from the driving backplane 10 at the same time. Figure 2 What is shown in

[0059] Figure 4A cross-sectional view of a reflective film 20 provided by an embodiment of the present disclosure. Figure 5 A cross-sectional view of another reflective film 20 provided by an embodiment of the present disclosure. As Figure 4 and Figure 5 shown, the reflective film 20 includes a plurality of first sub-film layers 201 and a plurality of second sub-film layers 202. The first sub-film layers 201 and the second sub-film layers 202 are alternately arranged along a direction perpendicular to the driving backplane 10, and the refractive index of the first sub-film layer 201 is greater than that of the second sub-film layer 202.

[0060] The first sub-film layers 201 and the second sub-film layers 202 are alternately arranged, so that the refractive indices of the respective sub-film layers in the reflective film 20 alternate in the order of high, low, high, low... or low, high, low, high...

[0061] In practical applications, the materials of the first sub-film layer 201 and the second sub-film layer 202 may be different. Exemplarily, the material of the first sub-film layer 201 is a material with a relatively high refractive index such as niobium pentoxide, titanium dioxide, etc.; the material of the second sub-film layer 202 is a material with a relatively low refractive index such as silicon oxide, magnesium fluoride, etc. Of course, the materials of the first sub-film layer 201 and the second sub-film layer 202 may also be others, and only exemplary explanations are given here.

[0062] Exemplarily, the reflective film 20 is a Distributed Bragg Reflector (DBR for short). When the light emitted by the light-emitting device 40 passes through the first sub-film layer 201 and the second sub-film layer 202, due to the different refractive indices of the first sub-film layer 201 and the second sub-film layer 202, the light emitted by the light-emitting device 40 will be reflected at the interface between the first sub-film layer 201 and the second sub-film layer 202, and the magnitude of the reflectivity is related to the refractive indices of the first sub-film layer 201 and the second sub-film layer 202. When the first sub-film layer 201 and the second sub-film layer 202 are alternately arranged, when the light emitted by the light-emitting device 40 passes through each first sub-film layer 201 and the second sub-film layer 202, since the light reflected back by each sub-film layer interferes due to the change in the phase angle, and then combines with each other, strong reflected light is obtained. That is, the brightness of the light emitted by the light-emitting device 40 is enhanced.

[0063] Continuing to refer to Figure 2 , the reflective film 20 may include a first reflective film 21 and a second reflective film 22. The first reflective film 21 is disposed on the side of the first electrode 30 facing the driving backplane 10, and the second reflective film 22 is disposed on the side of the second electrode 50 away from the driving backplane 10.

[0064] The first reflective film 21 and the second reflective film 22 are opposite and spaced apart. The first electrode 30, the light-emitting device 40, and the second electrode 50 are located between the first reflective film 21 and the second reflective film 22, so that a microcavity is formed between the first reflective film 21 and the second reflective film 22. According to the microcavity effect, the microcavity can enhance the intensity of small-angle light and suppress large-angle light. When the small-angle light is enhanced, the frontal brightness of the display panel can be improved. When the large-angle light is suppressed, the viewing angle of the display panel can be narrowed, thereby realizing the anti-peeping function. Therefore, when the reflective film 20 is provided on the side of the first electrode 30 facing the driving backplane 10 and on the side of the second reflective film 22 away from the driving backplane 10, the anti-peeping function can be realized while taking into account the frontal brightness.

[0065] It should be noted that when the first reflective film 21 and the second reflective film 22 are provided at the same time, the first reflective film 21 serves as a mirror, and the second reflective film 22 serves as a semi-transmissive and semi-reflective mirror. The light emitted by the light-emitting device 40 towards the first reflective film 21 is reflected, and a part of the light emitted by the light-emitting device 40 towards the second reflective film 22 passes through the second reflective film 22 and exits, and the other part of the light is reflected.

[0066] In addition, since the first electrode 30 and the second electrode 50 are located between the first reflective film 21 and the second reflective film 22, in order to prevent the first electrode 30 and the second electrode 50 from blocking light, the first electrode 30 and the second electrode 50 can be transparent electrodes. A transparent electrode refers to an electrode with a relatively high light transmittance. For example, the materials of the first electrode 30 and the second electrode 50 are indium tin oxide (ITO), indium zinc oxide (IZO), etc.

[0067] In actual application, when the materials of the first electrode 30 and the second electrode 50 are indium tin oxide (ITO), in order to reduce the resistance of the first electrode 30 and the second electrode 50, the film thickness of the first electrode 30 and the second electrode 50 can be 10 nm.

[0068] Continue to refer to Figure 2 , the thickness of the microcavity formed by the first reflective film 21 and the second reflective film 22 is D, and the thickness D of the microcavity is equal to the sum of the thicknesses of the first electrode 30, the light-emitting device 40, and the second electrode 50. When the first electrode 30 and the second electrode 50 are used as mirrors, the distance between the first electrode 30 and the second electrode 50 (i.e., the thickness of the light-emitting device 40) is the thickness of the microcavity. When the thickness of the microcavity remains unchanged, when the microcavity is formed by using the first reflective film 21 and the second reflective film 22, the thickness of the light-emitting device 40 can be reduced. When the thickness of the light-emitting device 40 is reduced, it is more conducive to reducing large-angle light, thereby narrowing the viewing angle of the display panel and realizing the anti-peeping function.

[0069] For example, in the related art, the thickness of the red light-emitting device 40 is 257 nm, the thickness of the green light-emitting device 40 is 208 nm, and the thickness of the blue light-emitting device 40 is 168 nm. When the first reflective film 21 and the second reflective film 22 are provided simultaneously, the thickness of the red light-emitting device 40 can be 121 nm, the thickness of the green light-emitting device 40 can be 107 nm, and the thickness of the blue light-emitting device 40 can be 74 nm.

[0070] Exemplarily, along the direction away from the first electrode 30, the light-emitting device 40 sequentially includes a hole injection layer, a hole transport layer, a filling layer, a light-emitting layer, an electron transport layer, and an electron injection layer.

[0071] Considering the influence of the film layer thickness on the electrical characteristics, when the overall thickness of the light-emitting device 40 is reduced, it is necessary to ensure that the thicknesses of the light-emitting layer, the electron injection layer, and the hole injection layer remain unchanged, and only change the thicknesses of the hole transport layer, the electron transport layer, and the filling layer.

[0072] Figure 6 This is a cross-sectional view of another display panel provided by an embodiment of the present disclosure. As Figure 6 shown, the display panel may also be provided with the first reflective film 21 only on the side of the first electrode 30 facing the driving backplane 10.

[0073] When the first reflective film 21 is provided only on the side of the first electrode 30 facing the driving backplane 10, it is also possible to reduce the large-angle light rays emitted by the light-emitting device 40, thereby narrowing the viewing angle and achieving the anti-peeping function.

[0074]

[0075] Table 1

[0076] Table 1 shows the viewing angle brightness comparison data of several different types of display panels. Among them, the type I display panel refers to a light-emitting device 40 with a conventional thickness, and no reflective film 20 and anti-peeping film are provided. The type II display panel refers to a light-emitting device 40 with a conventional thickness, and an anti-peeping film is provided. The type III display panel refers to the simultaneous provision of the first reflective film 21 and the second reflective film 22, and the light-emitting device 40 is thinned. The type IV display panel refers to the provision of only the first reflective film 21 but not the second reflective film 22.

[0077] The angles in Table 1 refer to the angle between the user's line of sight and the normal of the display panel. After normalization, the positive viewing angle brightness is set to 100%, and the angles corresponding to 50%, 10%, 5%, and 1% brightness are compared respectively. By

[0078] As can be seen from Table 1, at 5% brightness, the viewing angle of the Type-I display panel is 80°, that of the Type-II display panel is 33°, that of the Type-III display panel is 33°, and that of the Type-IV display panel is 58°. The viewing angles of the Type-II display panel and the Type-III display panel are the same at 5% brightness, both being 33°. That is, the anti-peeping effect of simultaneously setting the first reflective film 21 and the second reflective film 22 is the same as that of setting an anti-peeping film in the related art. Moreover, when the first reflective film 21 and the second reflective film 22 are simultaneously set, the thickness of the display panel hardly increases, while the thickness of the display panel needs to increase by 325 μm when an anti-peeping film is set.

[0079] Figure 7 It is a normalized graph of viewing angle and brightness. As Figure 7 shown, the anti-peeping effects of the Type-II display panel and the Type-III display panel are basically the same. That is, the anti-peeping effect of simultaneously setting the first reflective film 21 and the second reflective film 22 is basically the same as that of setting an anti-peeping film.

[0080] Figure 8 It is a curve graph of the brightness of each color in the Type-II display panel, Figure 9 and Figure 8 is a curve graph of the brightness of each color in the Type-III display panel. From Figure 9 it can be seen that whether it is the Type-II display panel or the Type-III display panel, the viewing angle brightness curves of different colors basically coincide, and there is no risk of white dot color deviation.

[0081] Type I display panel Type III display panel Ratio Blue 0.387 0.385 99.5％ Green 2.82 2.92 103.6％ Red 0.986 1.53 155.6％

[0082] Table 2

[0083] Table 2 shows the emission brightness of various colors in the Type-I display panel and the emission brightness of various colors in the Type-III display panel. As can be seen from Table 2, regarding blue OLED and green OLED, the brightness of the Type-I display panel and the Type-III display panel is basically the same; regarding red OLED, the brightness of the Type-III display panel is 155.6% of the brightness of the Type-I display panel. That is, the brightness of red OLED in the Type-III display panel has increased by about 50%.

[0084] If the Type-III display panel is compared with the Type-II display panel, since the transmittance of the anti-peeping film is about 65%, it can be calculated that when the Type-III display panel is compared with the Type-II display panel, the brightness of blue OLED has increased by about 53%, the brightness of green OLED has increased by about 59%, and the brightness of red OLED has increased by about 139%. Thus, it can be seen that simultaneously setting the first reflective film 21 and the second reflective film 22 can not only narrow the viewing angle to achieve the anti-peeping function, but also improve the display brightness when viewed directly.

[0085] Figure 10The cross-sectional view of another display panel provided by the embodiments of the present disclosure. As Figure 10 shown, the display panel may also be provided with a second reflective film 22 only on the side of the second electrode 50 away from the driving backplane 10.

[0086] When the second reflective film 22 is provided only on the side of the second electrode 50 away from the driving backplane 10, the large-angle light emitted by the light-emitting device 40 can also be reduced, thereby narrowing the viewing angle and realizing the anti-peeping function.

[0087] Continue to refer to Figure 4 , Figure 4 The reflective film 20 shown in may be the first reflective film 21. As Figure 4 shown, the first reflective film 21 includes a plurality of first sub-film layers 201 and a plurality of second sub-film layers 202, and the first sub-film layers 201 and the second sub-film layers 202 are alternately and stacked. Along the order from top to bottom, the first layer is L1, the second layer is L2,... the nth layer is Ln. The sum of the number of the first sub-film layers 201 and the second sub-film layers 202 in the first reflective film 21 may be an even number, that is, n is an even number.

[0088] Exemplarily, odd layers such as L1, L3, L5... are the first sub-film layers 201, and even layers such as L2, L4, L6... Ln are the second sub-film layers 202.

[0089] Of course, the sum of the number of the first sub-film layers 201 and the second sub-film layers 202 in the first reflective film 21 may also be an odd number, that is, n is an odd number.

[0090] The refractive index of the first sub-film layer 201 is greater than the refractive index of the second sub-film layer 202. The embodiments of the present disclosure do not limit the specific values and differences of the refractive index of the first sub-film layer 201 and the refractive index of the second sub-film layer 202, and can be flexibly set according to actual situations in practical applications.

[0091] Among them, the refractive indices of the respective first sub-film layers 201 may be the same or different. When the refractive indices of the respective first sub-film layers 201 are different, as long as it is ensured that the refractive index of the first sub-film layer 201 is greater than the refractive index of the adjacent second sub-film layer 202. Similarly, the refractive indices of the respective second sub-film layers 202 may be the same or different. When the refractive indices of the respective second sub-film layers 202 are different, as long as it is ensured that the refractive index of the second sub-film layer 202 is less than the refractive index of the adjacent first sub-film layer 201.

[0092] Exemplarily, the refractive indices of the respective first sub-film layers 201 in the first reflective film 21 are the same, for example, the materials of the respective first sub-film layers 201 are the same; the thicknesses of the respective first sub-film layers 201 in the first reflective film 21 are the same.

[0093] Exemplarily, the refractive indices of the respective second sub-film layers 202 in the first reflective film 21 are the same. For example, the materials of the respective second sub-film layers 202 are the same; the thicknesses of the respective second sub-film layers 202 in the first reflective film 21 are the same.

[0094] In addition, the refractive indices of the first sub-film layers 201 in different first reflective films 21 may be the same or different. For example, the refractive index of the first sub-film layer 201 in the first reflective film 21 corresponding to the red light-emitting device 40 is A1, the refractive index of the first sub-film layer 201 in the first reflective film 21 corresponding to the green light-emitting device 40 is B1, and the refractive index of the first sub-film layer 201 in the first reflective film 21 corresponding to the blue light-emitting device 40 is C1. A1, B1, and C1 may be the same or different from each other.

[0095] Similarly, the thicknesses of the first sub-film layers 201 in different first reflective films 21 may be the same or different. For example, the thickness of the first sub-film layer 201 in the first reflective film 21 corresponding to the red light-emitting device 40 is A2, the thickness of the first sub-film layer 201 in the first reflective film 21 corresponding to the green light-emitting device 40 is B2, and the thickness of the first sub-film layer 201 in the first reflective film 21 corresponding to the blue light-emitting device 40 is C2. A2, B2, and C2 may be the same or different from each other.

[0096] In some embodiments, the sum of the number of the first sub-film layers 201 and the second sub-film layers 202 in the first reflective film 21 is greater than or equal to 16. For example, the sum of the number of the first sub-film layers 201 and the second sub-film layers 202 in the first reflective film 21 is 16, 18, 20, 22, etc., so that the reflectivity of the first reflective film 21 for the light emitted by the light-emitting device 40 is greater than 99%, thereby improving the front view brightness of the display panel.

[0097] In some embodiments, when the light-emitting device 40 is a green light-emitting device 40 or a blue light-emitting device 40, the first sub-film layer 201 closest to the first electrode 30 in the first reflective film 21 is the first sub-film layer 201. That is, the green light-emitting device 40 or the blue light-emitting device 40 is in direct contact with the high refractive index film layer.

[0098] In some embodiments, when the light-emitting device 40 is a red light-emitting device 40, the second sub-film layer 202 closest to the first electrode 30 in the first reflective film 21 is the second sub-film layer 202. That is, the red light-emitting device 40 is in direct contact with the low refractive index film layer.

[0099] The characteristics of different color light-emitting devices 40 are different. By adjusting the refractive index of the film layer in direct contact with the light-emitting device 40 according to the light-emitting characteristics of the light-emitting device 40, the front view brightness of the display panel can be improved.

[0100] In some embodiments, the central wavelength of the first reflective film 21 is greater than the emission central wavelength of the light-emitting device 40, and the difference is greater than or equal to 15 nm and less than or equal to 45 nm. Among them, the reflectivity of the first reflective film 21 is the largest at the central wavelength position. The emission central wavelength of the light-emitting device 40 refers to the wavelength corresponding to the midpoint of the line segment with the largest amplitude value in the spectrum of the light source.

[0101] The same light-emitting device 40 can emit light of multiple wavelengths. When the central wavelength of the first reflective film 21 is greater than the emission central wavelength of the light-emitting device 40, the first reflective film 21 can achieve a better reflection effect on the light of each wavelength emitted by the light-emitting device 40, thereby improving the front-view brightness of the display panel.

[0102] In some embodiments, the thicknesses of the first sub-film layer 201 and the second sub-film layer 202 in the reflective film 20 can be calculated according to the central wavelength of the reflective film 20. For example, d = λ / (4*n), where d is the thickness, λ is the central wavelength of the reflective film 20, and n is the refractive index of the sub-film layer.

[0103] Exemplarily, the thickness of the first sub-film layer 201 in the first reflective film 21 is d1, d1 = λ1 / (4*n1); and / or, the thickness of the second sub-film layer 202 is d2, d2 = λ / (4*n2); where, n1 is the refractive index of the first sub-film layer 201, n2 is the refractive index of the second sub-film layer 202, and λ is the central wavelength of the reflective film 20.

[0104] Exemplarily, the thickness of the first sub-film layer 201 in the first reflective film 21 can be calculated according to the central wavelength of the first reflective film 21. For example, the thickness of the first sub-film layer 201 is d1, d1 = λ1 / (4*n1), n1 is the refractive index of the first sub-film layer 201, and λ1 is the central wavelength of the first reflective film 21.

[0105] Exemplarily, the thickness of the second sub-film layer 202 in the first reflective film 21 can be calculated according to the central wavelength of the first reflective film 21. For example, the thickness of the second sub-film layer 202 is d2, d2 = λ1 / (4*n2), n2 is the refractive index of the first sub-film layer 201, and λ1 is the central wavelength of the first reflective film 21.

[0106] It should be noted that the first sub-film layer 201 in the first reflective film 21 and the first sub-film layer 201 in the second reflective film 22 can be the same or different, and can be flexibly set according to needs in actual applications. Being the same means that both the refractive index and the thickness are the same, and being different means that either the refractive index or the thickness is different.

[0107] Continue to refer to Figure 5 , Figure 5 The reflective film 20 shown in Figure 5As shown, the second reflective film 22 includes a plurality of first sub-film layers 201 and a plurality of second sub-film layers 202, and the first sub-film layers 201 and the second sub-film layers 202 are alternately and stacked. Along the order from top to bottom, the first layer is L1, the second layer is L2,... the nth layer is Ln. The sum of the number of the first sub-film layers 201 and the second sub-film layers 202 in the first reflective film 21 can be odd, that is, n is odd.

[0108] Exemplarily, odd layers such as L1, L3, L5... are the first sub-film layers 201, and even layers such as L2, L4, L6... Ln are the second sub-film layers 202.

[0109] Wherein, the refractive indices of the respective first sub-film layers 201 in the second reflective film 22 may be the same or different. When the refractive indices of the respective first sub-film layers 201 are different, it is only necessary to ensure that the refractive index of the first sub-film layer 201 is greater than the refractive index of the second sub-film layer 202 adjacent thereto. Similarly, the refractive indices of the respective second sub-film layers 202 may be the same or different. When the refractive indices of the respective second sub-film layers 202 are different, it is only necessary to ensure that the refractive index of the second sub-film layer 202 is less than the refractive index of the first sub-film layer 201 adjacent thereto.

[0110] Exemplarily, the refractive indices of the respective first sub-film layers 201 in the second reflective film 22 are the same, for example, the materials of the respective first sub-film layers 201 are the same; the thicknesses of the respective first sub-film layers 201 in the second reflective film 22 are the same.

[0111] Exemplarily, the refractive indices of the respective second sub-film layers 202 in the second reflective film 22 are the same, for example, the materials of the respective second sub-film layers 202 are the same; the thicknesses of the respective second sub-film layers 202 in the second reflective film 22 are the same.

[0112] In addition, the refractive indices of the first sub-film layers 201 in different second reflective films 22 may be the same or different. For example, the refractive index of the first sub-film layer 201 in the second reflective film 22 corresponding to the red light-emitting device 40 is A1, the refractive index of the first sub-film layer 201 in the second reflective film 22 corresponding to the green light-emitting device 40 is B1, and the refractive index of the first sub-film layer 201 in the second reflective film 22 corresponding to the blue light-emitting device 40 is C1, and A1, B1, and C1 may be the same or different.

[0113] In some embodiments, the sum of the number of the first sub-layer 201 and the second sub-layer 202 in the second reflective film 22 is greater than or equal to 7. For example, the sum of the number of the first sub-layer 201 and the second sub-layer 202 in the second reflective film 22 is 7, 9, 11, 13, etc., so that the reflectivity of the second reflective film 22 for the light emitted by the light-emitting device 40 is 60%-80%, and the reflectivity for the central wavelength band of the second reflective film 22 is 90%-98%, making the second reflective film 22 a semi-transmissive and semi-reflective film. Among them, the reflectivity of the second reflective film 22 is the largest at the central wavelength position.

[0114] In some embodiments, the first sub-layer 201 is the one closest to the second electrode 50 in the second reflective film 22. That is, the high refractive index film layer is in direct contact with the light-emitting device 40.

[0115] In some embodiments, the central wavelength of the second reflective film 22 is greater than the emission central wavelength of the light-emitting device 40, and the difference is greater than or equal to 50 nm and less than or equal to 90 nm.

[0116] The same light-emitting device 40 can emit light of multiple wavelengths. When the central wavelength of the second reflective film 22 is greater than the emission central wavelength of the light-emitting device 40, the second reflective film 22 can achieve a better reflection effect on the light of each wavelength emitted by the light-emitting device 40, thereby improving the front view brightness of the display panel.

[0117] Exemplarily, the thickness of the first sub-layer 201 in the second reflective film 22 is d1, d1 = λ1 / (4*n1); and / or, the thickness of the second sub-layer 202 is d2, d2 = λ / (4*n2); where n1 is the refractive index of the first sub-layer 201, n2 is the refractive index of the second sub-layer 202, and λ is the central wavelength of the reflective film 20.

[0118] Exemplarily, the thickness of the first sub-layer 201 in the second reflective film 22 can be calculated according to the central wavelength of the second reflective film 22. For example, the thickness of the first sub-layer 201 in the second reflective film 22 is d3, d3 = λ2 / (4*n3), n3 is the refractive index of the first sub-layer 201, and λ2 is the central wavelength of the second reflective film 22.

[0119] Exemplarily, the thickness of the second sub-layer 202 in the second reflective film 20 can be calculated according to the central wavelength of the second reflective film 22. For example, the thickness of the second sub-layer 202 is d4, d4 = λ2 / (4*n4), n4 is the refractive index of the first sub-layer 201, and λ2 is the central wavelength of the first reflective film 21.

[0120]

[0121] Table 3

[0122] Table 3 shows an example of the emission center wavelength of the light-emitting device 40 and the center wavelength of the reflective film 20. Exemplarily, the thicknesses of the first sub-film layer 201 and the second sub-film layer 202 can be calculated respectively according to the center wavelength of the reflective film 20 in Table 3.

[0123] Continuing to refer to Figure 2 、 Figure 6 and Figure 10 , the display panel may further include a viewing angle switching layer 90, and the viewing angle switching layer 90 is located on the side of the second electrode 50 away from the driving backplane 10. The viewing angle switching layer 90 can realize the switching of the display modes between a narrow viewing angle and a wide viewing angle.

[0124] The viewing angle switching layer 90 can be a polymer-doped PDLC (Polymer Dispersed Liquid Crystal) liquid crystal, and other electro-controlled switching devices such as a switching liquid crystal grating can be used.

[0125] Exemplarily, the viewing angle switching layer 90 adopts an electro-controlled driving PDLC device. When the PDLC device is not powered on, the haze is greater than 70%, realizing effective diffusion of the viewing angle and achieving a wide viewing angle display. At this time, the brightness of the front viewing angle drops to 50% of the narrow viewing angle display, and the angle corresponding to 5% of the front viewing angle brightness expands from 33° to 64°, realizing a wide viewing angle display; when the device is powered on, the haze is about 10%, having a weak impact on the viewing angle brightness. The introduction of haze can cause the picture to be blurred to a certain extent, thereby compensating for the problem of OLED color separation and ensuring the display picture. Therefore, the haze needs to be between 5% and 20% when powered on.

[0126] Exemplarily, the viewing angle switching layer 90 can adopt a partition driving design to realize separate control of the viewing angles at different positions.

[0127] The embodiment of the present disclosure also provides a method for manufacturing a display panel, and the reflective film 20 is manufactured by an evaporation method. For example, the film layer sequence and film layer thickness of the reflective film 20 corresponding to different color light-emitting devices 40 are different. In order to realize the production of the pixel-level reflective film 20, the technical solution of evaporating and manufacturing the reflective film 20 is preferably adopted. Similar to the processing schemes of existing different color light-emitting devices 40, the position and thickness of each evaporation are controlled by using the position of the opening area of the mask, so as to realize different reflective films 20 corresponding to different color light-emitting devices 40.

[0128] Figure 11 It is a flowchart of a manufacturing method for a display panel. As Figure 11As shown, step (1) first prepares a driving backplane 10; step (2) prepares a first reflective film 21 corresponding to the first color light-emitting device 40 on the driving backplane 10; step (3) prepares a first reflective film 21 corresponding to the second color light-emitting device 40 on the driving backplane 10; step (4) prepares a first reflective film 21 corresponding to the third color light-emitting device 40 on the driving backplane 10; step (5) prepares a first electrode 30; step (6) prepares the first color light-emitting device 40; step (7) prepares the second color light-emitting device 40; step (8) prepares the third color light-emitting device 40; step (9) prepares a second electrode 50; step (10) prepares a second reflective film 22 corresponding to the first color light-emitting device 40; step (11) prepares a second reflective film 22 corresponding to the second color light-emitting device 40; step (12) prepares a second reflective film 22 corresponding to the third color light-emitting device 40; step (13) prepares a packaging layer 60.

[0129] Exemplarily, the display panel further includes a color filter layer 70, and the color filter layer 70 is located between the packaging layer 60 and the protection layer 80.

[0130] As mentioned above, it is only the specific implementation manner of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should all be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claimed rights.

Claims

1. A display panel, comprising a driving backplane, a first electrode, a light-emitting device, and a second electrode that are sequentially stacked on the driving backplane, wherein The display panel further includes a reflective film, and the reflective film is disposed on one side of the first electrode facing the driving backplane and / or on one side of the second electrode away from the driving backplane; The reflective film includes a plurality of first sub-film layers and a plurality of second sub-film layers, the first sub-film layers and the second sub-film layers are alternately disposed along a direction perpendicular to the driving backplane, and the refractive index of the first sub-film layer is greater than that of the second sub-film layer.

2. The display panel according to claim 1, wherein The reflective film includes a first reflective film, the first reflective film is disposed on one side of the first electrode facing the driving backplane, and when the light-emitting device is a green light-emitting device or a blue light-emitting device, the first sub-film layer closest to the first electrode in the first reflective film.

3. The display panel according to claim 1, wherein The reflective film includes a first reflective film, the first reflective film is disposed on one side of the first electrode facing the driving backplane, and when the light-emitting device is a red light-emitting device, the second sub-film layer closest to the first electrode in the first reflective film.

4. The display panel according to claim 1, wherein, The reflective film includes a first reflective film, the first reflective film is disposed on one side of the first electrode facing the driving backplane, and the sum of the number of the first sub-film layer and the second sub-film layer in the first reflective film is greater than or equal to 16.

5. The display panel according to claim 1, wherein, The reflective film includes a first reflective film, the first reflective film is disposed on one side of the first electrode facing the driving backplane, and the central wavelength of the first reflective film is greater than the emission central wavelength of the light-emitting device, and the difference is greater than or equal to 15 nm and less than or equal to 45 nm.

6. The display panel according to any one of claims 1 to 5, characterized in that, The reflective film includes a second reflective film, the second reflective film is disposed on one side of the second electrode away from the driving backplane, and the sum of the number of the first sub-film layer and the second sub-film layer in the second reflective film is odd.

7. The display panel according to claim 6, characterized in that, The first sub-film layer closest to the second electrode in the second reflective film.

8. The display panel according to claim 6, wherein The central wavelength of the second reflective film is greater than the emission central wavelength of the light-emitting device, and the difference is greater than or equal to 50 nm and less than or equal to 90 nm.

9. The display panel according to claim 1, wherein The thickness of the first sub-film layer is d1, d1 = λ / (4*n1); and / or, the thickness of the second sub-film layer is d2, d2 = λ / (4*n2); Wherein, n1 is the refractive index of the first sub-film layer, n2 is the refractive index of the second sub-film layer, and λ is the central wavelength of the reflective film.

10. A display device, characterized in that, Including the display panel according to any one of claims 1 to 9.

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