Display panel, preparation method and display device

Abstract

The invention discloses a display panel, a preparation method and a display device. The display panel comprises an array substrate and a plurality of light-emitting elements arranged on one side of the array substrate. The light-emitting element comprises a first light-emitting unit, an optical function layer and a second light-emitting unit which are sequentially arranged in a stacked mode. The first light-emitting unit is located on the side, close to the array substrate, of the optical function layer, and the second light-emitting unit is located on the side, away from the array substrate, of the optical function layer. The display modes of the display panel comprise a peep-proof mode and a conventional mode; in the peep-proof mode, in the same light-emitting element, the first light-emitting unit emits light, and the second light-emitting unit does not emit light; in the conventional mode, in the same light-emitting element, the first light-emitting unit does not emit light, and the second light-emitting unit emits light. By adopting the technical scheme, an active peep-proof function without externally sticking a peep-proof film can be realized.

Description

Technical Field

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

[0002] With the development of technology, display screens can display more and more content. In some scenarios, people like to share the displayed content with others, but in some scenarios they hope to have privacy.

[0003] The existing anti-peeping technology mainly achieves the anti-peeping effect by applying an anti-peeping film to the outside. However, while achieving the anti-peeping effect, the anti-peeping film will also significantly reduce the brightness of the display at the front viewing angle, and will also increase the thickness of the display. It is also not suitable for foldable screen mobile phones, and there is a risk that the anti-peeping film will not fit at the folding point. Summary of the invention

[0004] The present invention provides a display panel, a preparation method and a display device to realize an active anti-peeping function without externally pasting an anti-peeping film.

[0005] According to one aspect of the present invention, there is provided a display panel, comprising: an array substrate, and a plurality of light emitting elements arranged on one side of the array substrate;

[0006] The light emitting element comprises a first light emitting unit, an optical function layer and a second light emitting unit which are stacked in sequence; the first light emitting unit is located on a side of the optical function layer close to the array substrate, and the second light emitting unit is located on a side of the optical function layer away from the array substrate;

[0007] The display modes of the display panel include an anti-peeping mode and a normal mode;

[0008] In the anti-peeping mode, in the same light-emitting element, the first light-emitting unit emits light, and the second light-emitting unit does not emit light;

[0009] In the normal mode, in the same light emitting element, the first light emitting unit does not emit light, and the second light emitting unit emits light.

[0010] According to another aspect of the present invention, there is provided a method for preparing a display panel, comprising:

[0011] providing an array substrate;

[0012] forming a plurality of first light emitting units on one side of the array substrate;

[0013] An optical function layer is formed on a side of each first light emitting unit away from the array substrate; along a direction perpendicular to the plane where the array substrate is located, a projection of the optical function layer on the plane where the array substrate is located overlaps with a projection of the first light emitting unit on the plane where the array substrate is located;

[0014] A plurality of second light-emitting units are formed on a side of the optical function layer away from the array substrate and arranged corresponding to the first light-emitting unit; along a direction perpendicular to the plane where the array substrate is located, the projection of the second light-emitting unit on the plane where the array substrate is located overlaps with the projection of the first light-emitting unit on the plane where the array substrate is located; along a direction perpendicular to the plane where the array substrate is located, the first light-emitting unit, the optical function layer, and the second light-emitting unit whose projections overlap on the plane where the array substrate is located constitute a light-emitting element;

[0015] Among them, the display mode of the display panel includes an anti-peeping mode and a normal mode; in the anti-peeping mode, in the same light-emitting element, the first light-emitting unit emits light and the second light-emitting unit does not emit light; in the normal mode, in the same light-emitting element, the first light-emitting unit does not emit light and the second light-emitting unit emits light.

[0016] According to yet another aspect of the present invention, there is provided a display device, comprising: the above-mentioned display panel.

[0017] According to the technical solution of the present invention, the same light-emitting element includes a first light-emitting unit and a second light-emitting unit which are stacked and can emit light in time, and an optical functional layer which can change the optical performance is placed between the first light-emitting unit and the second light-emitting unit, so that the emitted light of the first light-emitting unit can be converged, or the emitted light of the second light-emitting unit can be diffused, so that in the anti-peeping mode, when the first light-emitting unit is controlled to emit light alone, the light-emitting brightness of the light-emitting element at a large viewing angle can be weak, and the anti-peeping display function can be realized; in the normal mode, when the second light-emitting unit is controlled to emit light alone, the light-emitting brightness of the light-emitting element at a large viewing angle can be strong, the anti-peeping function can be turned off, and the normal display function can be realized. In this way, the anti-peeping function can be realized without the need for an external anti-peeping film, and whether to turn on the anti-peeping function can be selected according to the user's usage scenario, so as to realize flexible control of the anti-peeping function.

[0018] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 is a structural schematic diagram of a display panel provided by an embodiment of the present invention;

[0021] Figure 2is a schematic diagram of brightness attenuation of a light-emitting element in different display modes provided by an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of a light path of a light emitting element in an anti-peeping mode provided by an embodiment of the present invention;

[0023] Figure 4 is a schematic structural diagram of another light-emitting element provided by an embodiment of the present invention;

[0024] Figure 5 is a schematic structural diagram of another light-emitting element provided by an embodiment of the present invention;

[0025] Figure 6 is a schematic structural diagram of another light-emitting element provided by an embodiment of the present invention;

[0026] Figure 7 is a structural schematic diagram of another display panel provided by an embodiment of the present invention;

[0027] Figure 8 is a structural schematic diagram of another display panel provided by an embodiment of the present invention;

[0028] Fig. 9 is a structural schematic diagram of another display panel provided by an embodiment of the present invention;

[0029] Fig.10 is a structural schematic diagram of another display panel provided by an embodiment of the present invention;

[0030] Fig.11 is a structural schematic diagram of another display panel provided by an embodiment of the present invention;

[0031] Fig.12 is a structural schematic diagram of a pixel driving circuit provided by an embodiment of the present invention;

[0032] Fig.13 is a schematic flow chart of a method for manufacturing a display panel provided by an embodiment of the present invention;

[0033] Fig.14 It is a structural schematic diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] As described in the background technology, although the anti-peeping effect can be achieved by applying an anti-peeping film, the anti-peeping film will also bring some other problems. In addition to the problems mentioned in the background technology that it will significantly reduce the brightness of the display screen at the front viewing angle, increase the thickness of the display screen, and is not suitable for folding mobile phones, there is also the problem of not being able to choose whether to turn on the anti-peeping function according to the user's usage scenario. After applying the anti-peeping film, the display screen is always in the anti-peeping mode, and the anti-peeping mode cannot be actively turned on or off according to the usage scenario, which cannot meet the actual needs of users.

[0037] To solve the above technical problems, an embodiment of the present invention provides a display panel, comprising: an array substrate, and a plurality of light-emitting elements arranged on one side of the array substrate; the light-emitting elements comprise a first light-emitting unit, an optical functional layer, and a second light-emitting unit stacked in sequence; the first light-emitting unit is located on a side of the optical functional layer close to the array substrate, and the second light-emitting unit is located on a side of the optical functional layer away from the array substrate; the display mode of the display panel comprises an anti-peeping mode and a normal mode; in the anti-peeping mode, in the same light-emitting element, the first light-emitting unit emits light, and the second light-emitting unit does not emit light; in the normal mode, in the same light-emitting element, the first light-emitting unit does not emit light, and the second light-emitting unit emits light.

[0038] With the above technical solution, the same light-emitting element includes a first light-emitting unit and a second light-emitting unit that are stacked and can emit light in time, and an optical functional layer that can change the optical performance is placed between the first light-emitting unit and the second light-emitting unit, which can converge the emitted light of the first light-emitting unit, or diffuse the emitted light of the second light-emitting unit, so that in the anti-peeping mode, when the first light-emitting unit is controlled to emit light alone, the light-emitting brightness of the light-emitting element at a large viewing angle can be weak, and the anti-peeping display function can be realized; in the normal mode, when the second light-emitting unit is controlled to emit light alone, the light-emitting brightness of the light-emitting element at a large viewing angle can be strong, the anti-peeping function is turned off, and the normal display function is realized. In this way, the anti-peeping function can be realized without the need for an external anti-peeping film, and whether to turn on the anti-peeping function can be selected according to the user's usage scenario, realizing flexible control of the anti-peeping function.

[0039] The above is the core idea of ​​the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0040] Figure 1 is a schematic diagram of a display panel provided by an embodiment of the present invention, with reference to Figure 1 The display panel 001 includes: an array substrate 100, and a plurality of light-emitting elements 200 arranged on one side of the array substrate 100; the light-emitting element 200 includes a first light-emitting unit 210, an optical function layer 230 and a second light-emitting unit 220 stacked in sequence; the first light-emitting unit 210 is located on a side of the optical function layer 230 close to the array substrate 100, and the second light-emitting unit 220 is located on a side of the optical function layer 230 away from the array substrate 100.

[0041] The display modes of the display panel 001 include an anti-peeping mode and a normal mode; in the anti-peeping mode, in the same light-emitting element 200, the first light-emitting unit 210 emits light, and the second light-emitting unit 220 does not emit light; in the normal mode, in the same light-emitting element 200, the first light-emitting unit 210 does not emit light, and the second light-emitting unit 220 emits light.

[0042] Specifically, in a direction perpendicular to the plane where the array substrate 100 is located, the projection of the first light-emitting unit 210 on the plane where the array substrate 100 is located overlaps with the projection of the second light-emitting unit 220 on the plane where the array substrate 100 is located, and the first light-emitting unit 210 and the second light-emitting unit 220 in the same light-emitting element 200 are stacked, and the first light-emitting unit 210 and the second light-emitting unit 220 can emit light in time to achieve switching between different display modes (anti-peeping mode and normal mode). In a direction perpendicular to the plane where the array substrate 100 is located, the projection of the optical functional layer 230 on the plane where the array substrate 100 is located overlaps with the projection of the first light-emitting unit 210 on the plane where the array substrate 100 is located, and / or the projection of the optical functional layer 230 on the plane where the array substrate 100 is located overlaps with the projection of the second light-emitting unit 220 on the plane where the array substrate 100 is located. The optical functional layer 230 can change the optical properties of the first light-emitting unit 210 and / or the second light-emitting unit 220 to achieve that in the anti-peep mode, the light-emitting brightness of the light-emitting element 200 at a large viewing angle is weaker, and in the normal mode, the light-emitting brightness of the light-emitting element 200 at a large viewing angle is stronger.

[0043] Exemplarily, the array substrate 100 includes a base substrate 110 and a circuit layer 120 located on one side of the base substrate 110, and the light-emitting element 200 is located on the side of the circuit layer 120 away from the base substrate 110. The circuit layer 120 may include a plurality of pixel driving circuits (not shown in the figure), and the pixel driving circuit may be electrically connected to the light-emitting element 200 (not shown in the figure) to provide a driving current for the light-emitting element 200. In an optional embodiment, the light-emitting element 200 may be electrically connected to two pixel driving circuits, and the first light-emitting unit 210 and the second light-emitting unit 220 may be electrically connected to different pixel driving circuits, respectively, to achieve time-sharing light emission.

[0044] When the light-emitting side of the first light-emitting unit 210 and the light-emitting side of the second light-emitting unit 220 are both on the side far from the array substrate 100, the optical function layer 230 can have a convergence effect on the light. After the light emitted by the first light-emitting unit 210 passes through the optical function layer 230, the light at a large viewing angle is reduced, that is, the luminous brightness at a large viewing angle is weak; the light emitted by the second light-emitting unit 220 is not converged by the optical function layer 230, the light at a large viewing angle is not reduced, and the luminous brightness at a large viewing angle is strong. When the light-emitting side of the first light-emitting unit 210 and the light-emitting side of the second light-emitting unit 220 are both on the side close to the array substrate 100, the optical function layer 230 can have a diffusion effect on the light. When the light emitted by the second light-emitting unit 220 passes through the optical function layer 230, the light at a large viewing angle is increased, that is, the luminous brightness at a large viewing angle is strong; the light emitted by the first light-emitting unit 210 is not diffused by the optical function layer 230, the light at a large viewing angle is not increased, and the luminous brightness at a large viewing angle is weak.

[0045] In this way, whether it is the top-emitting light-emitting element 200 or the bottom-emitting light-emitting element 200, in the anti-peeping mode of the display panel 001, when only the first light-emitting unit 210 is turned on, the brightness of the light-emitting element 200 at a large viewing angle is weak to achieve the anti-peeping display function, and in the normal mode of the display panel 001, when only the second light-emitting unit 220 is turned on, the brightness of the light-emitting element 200 at a large viewing angle is strong to turn off the anti-peeping display function and achieve the normal display function. In other embodiments, the display mode of the display panel 001 may also include an intermediate mode, in which the first light-emitting unit 210 and the second light-emitting unit 220 can be turned on at the same time, and the display panel 001 is in a state between the anti-peeping display function and the normal display function. At this time, the display panel 001 has a certain anti-peeping function while taking into account the visibility within a certain range of viewing angles.

[0046] In an embodiment of the present invention, the same light-emitting element includes a first light-emitting unit and a second light-emitting unit that are stacked and capable of emitting light in different time periods, and an optical functional layer capable of changing the optical performance is placed between the first light-emitting unit and the second light-emitting unit, so that the emitted light of the first light-emitting unit can be converged, or the emitted light of the second light-emitting unit can be diffused, so that in the anti-peeping mode, when the first light-emitting unit is controlled to emit light alone, the light-emitting brightness of the light-emitting element at a large viewing angle can be weaker, thereby realizing the anti-peeping display function; in the normal mode, when the second light-emitting unit is controlled to emit light alone, the light-emitting brightness of the light-emitting element at a large viewing angle can be stronger, the anti-peeping function can be turned off, and the normal display function can be realized. In this way, the anti-peeping function can be realized without the need for an external anti-peeping film, and whether to turn on the anti-peeping function can be selected according to the user's usage scenario, thereby realizing flexible control of the anti-peeping function.

[0047] Optionally, in the anti-peep mode, the luminous brightness of the light-emitting element 200 at a preset viewing angle is a first brightness; in the normal mode, the luminous brightness of the light-emitting element 200 at the same preset viewing angle is a second brightness; the preset viewing angle is greater than zero degrees and less than ninety degrees; at the same height distance from the light-emitting element 200, the first brightness is less than the second brightness.

[0048] Specifically, at the same height distance from the light emitting element 200 and the same viewing angle, the light emitting brightness of the light emitting element 200 in the anti-peeping mode is less than the light emitting brightness of the light emitting element 200 in the normal mode. In the anti-peeping mode, the light emitting brightness of the light emitting element 200 at a preset viewing angle is weak, which means that at a wide viewing angle, it is easy to not see the display content of the display panel 001, thereby realizing the anti-peeping display function; in the normal mode, the light emitting brightness of the light emitting element 200 at a preset viewing angle is strong, which means that at a wide viewing angle, it is easier to see the display content of the display panel 001, thereby realizing the normal display function.

[0049] For example, Figure 2 is a schematic diagram of brightness attenuation of a light emitting element in different display modes provided by an embodiment of the present invention, with reference to Figure 2 As the viewing angle increases, the luminous brightness of the light-emitting element 200 in the anti-peeping mode decays faster than the luminous brightness of the light-emitting element 200 in the normal mode, which means that even if the first light-emitting unit 210 and the second light-emitting unit 220 are exactly the same (the same luminous color and luminous efficiency), and / or the luminous brightness at the positive viewing angle (0° viewing angle) is the same, in the anti-peeping mode, when only the first light-emitting unit 210 is turned on, the luminous brightness of the light-emitting element 200 decays faster as the viewing angle increases. At a large viewing angle, it is also easier to see the display content of the display panel 001 unclearly, so as to achieve the anti-peeping display function.

[0050] It should be noted that the first light-emitting unit 210 and the second light-emitting unit 220 may be completely identical, but the embodiments of the present invention are not limited thereto. In other embodiments, one or more of the size, luminous color, luminous efficiency, and luminous brightness at a front viewing angle of the first light-emitting unit 210 and the second light-emitting unit 220 may be different. For ease of description, without special limitations, the embodiments of the present invention take the first light-emitting unit 210 and the second light-emitting unit 220 as having the same size, luminous color, luminous efficiency, and luminous brightness at a front viewing angle as an example to exemplify the technical solution of the embodiments of the present invention.

[0051] Optionally, the refractive index of the optical functional layer 230 is greater than the refractive index of at least part of the film layer in the first light-emitting unit 210 .

[0052] For example, the light emitting side of the first light emitting unit 210 and the light emitting side of the second light emitting unit 220 are both on the side away from the array substrate 100, and the light emitting element 200 is top emitting. Figure 3 is a schematic diagram of the optical path of a light emitting element in an anti-peeping mode provided by an embodiment of the present invention, with reference to Figure 3 The light emitted from the first light emitting unit 210 is refracted in the optical functional layer 230, and the refraction angle is reduced, so that the light emitted from the first light emitting unit 210 can converge at an angle in the optical functional layer 230, which is conducive to realizing the anti-peeping display of the display panel 001 in the anti-peeping mode.

[0053] In addition, the light emitted from the first light-emitting unit 210 will also be refracted when reaching the second light-emitting unit from the optical functional layer 230. If the film structure of the second light-emitting unit 220 and the first light-emitting unit 210 is exactly the same, the refraction angle of the light emitted from the first light-emitting unit 210 may increase when passing through the second light-emitting unit 220, causing the light that was originally angularly converged to angularly diffuse. After the light emitted from the first light-emitting unit 210 passes through the optical functional layer 230 and the second light-emitting unit 220, the angle of the light may not change significantly. However, the light emitted from the first light-emitting unit 210 is significantly reduced in the emission area of ​​the display panel 001 (also referred to as the emission area of ​​the light emitted from the first light-emitting unit 210 in the display panel 001), so that the light emitted from the first light-emitting unit 210 can be regionally converged. In this way, at the same side viewing angle (wide viewing angle) position point, such as point A in the figure, after the outgoing light of the first light-emitting unit 210 converges in the area, the light that point A can receive is reduced, which can reduce the brightness of the light-emitting element 200 at the side viewing angle (wide viewing angle), and is also conducive to realizing the anti-peeping display of the display panel 001 in the anti-peeping mode.

[0054] Optional, Figure 4 is a schematic diagram of the structure of another light emitting element provided by an embodiment of the present invention, referring to Figure 4 The optical functional layer 230 includes a second surface F02 close to the second light emitting unit 220 , and the second surface F02 protrudes toward the second light emitting unit 220 ; and / or, the optical functional layer 230 includes a first surface F01 close to the first light emitting unit 210 , and the first surface F01 protrudes toward the first light emitting unit 210 .

[0055] Specifically, the optical functional layer 230 can form a convex lens. The light-emitting side of the first light-emitting unit 210 and the light-emitting side of the second light-emitting unit 220 are both on the side away from the array substrate 100. When the light-emitting element 200 is top-emitting, the refraction of light can be used to make the outgoing light of the first light-emitting unit 210 converge at an angle after passing through the optical functional layer 230, which is beneficial to increase the focusing effect of the optical functional layer 230 on the first light-emitting unit 210, accelerate the brightness of the first light-emitting unit 210 to decay with viewing angle, thereby improving the anti-peeping effect of the display panel 001 in the anti-peeping mode.

[0056] Based on the above embodiments, Figure 5 is a schematic diagram of the structure of another light emitting element provided by an embodiment of the present invention, referring to Figure 5 The second light emitting unit 220 includes a third surface F03 away from the array substrate 100 ; the third surface F03 protrudes in a direction away from the array substrate 100 .

[0057] Exemplarily, taking the case where both the light-emitting side of the first light-emitting unit 210 and the light-emitting side of the second light-emitting unit 220 are on the side away from the array substrate 100, and the light-emitting element 200 is top-emitting, the third surface F03 of the second light-emitting unit 220 is the light-emitting surface, and the light-emitting surface is convex toward the light-emitting side, which is beneficial to increase the wide-angle light when the second light-emitting unit 220 emits light, increase the visible angle, that is, increase the wide-angle visibility, which is beneficial to improve the display effect of the display panel 001 in the normal mode. In addition, the light-emitting surface of the second light-emitting unit 220 is convex toward the light-emitting side, and the second light-emitting unit 220 can also constitute a convex lens, which can further increase the convergence effect of the light emitted by the first light-emitting unit 210, thereby further improving the anti-peeping effect of the display panel 001 in the anti-peeping mode.

[0058] Optional, Figure 6 is a schematic diagram of the structure of another light-emitting element provided by an embodiment of the present invention, and a schematic diagram of the optical path of the light-emitting element in the anti-peeping mode, with reference to Figure 6 The optical functional layer 230 includes a first sub-functional layer 231 and a second sub-functional layer 232; the first sub-functional layer 231 is located on the side of the second sub-functional layer 232 close to the first light-emitting unit 210; the refractive index of the second sub-functional layer 232 is greater than the refractive index of the first sub-functional layer 231; the first sub-functional layer 231 includes a fourth surface F04 close to the second sub-functional layer 232, the second sub-functional layer 232 includes a fifth surface F05 close to the first sub-functional layer 231, and the fourth surface F04 is in contact with the fifth surface F05; the fifth surface F05 protrudes toward the first sub-functional layer 231.

[0059] Exemplarily, taking the case where both the light-emitting side of the first light-emitting unit 210 and the light-emitting side of the second light-emitting unit 220 are on the side away from the array substrate 100, and the light-emitting element 200 is top-emitting, the emitted light of the first light-emitting unit 210 can reach the second sub-functional layer 232 from the first sub-functional layer 231, and the second sub-functional layer 232 can constitute a convex lens, so that the emitted light of the first light-emitting unit 210 can converge at an angle after passing through the fourth surface F04 and the fifth surface F05, which is beneficial to increase the focusing effect of the optical functional layer 230 on the emitted light of the first light-emitting unit 210, accelerate the attenuation of the brightness of the first light-emitting unit 210 with the viewing angle, and thus enhance the anti-peeping effect of the display panel 001 in the anti-peeping mode. In addition, by utilizing the fourth surface F04 and the fifth surface F05 to realize the focusing effect of the outgoing light of the first light-emitting unit 210, it is possible to improve the anti-peeping effect while making the surface of the optical functional layer 230 close to the first light-emitting unit 210 and the surface of the second light-emitting unit 220 both flat, which is beneficial to simplify the preparation method of the first light-emitting unit 210 and the second light-emitting unit 220.

[0060] Optional, Figure 7is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention, referring to Figure 7 The first light-emitting unit 210 includes a first electrode 211, a first light-emitting functional layer 213 and a second electrode 212 which are stacked in sequence; the second electrode 212 is located on the side of the first light-emitting functional layer 213 close to the optical functional layer 230; the second light-emitting unit 220 includes a third electrode 221, a second light-emitting functional layer 223 and a fourth electrode 222 which are stacked in sequence; the third electrode 221 is located on the side of the second light-emitting functional layer 223 close to the optical functional layer 230; in the same light-emitting element 200, the second electrode 212 and the third electrode 221 are insulated from each other, which can realize the time-sharing light emission of the first light-emitting unit 210 and the second light-emitting unit 220, and avoid the short circuit between the second electrode 212 and the third electrode 221, which makes it impossible to control the light emission of the first light-emitting unit 210 and the second light-emitting unit 220 separately.

[0061] For example, taking the light emitting element 200 as an OLED as an example, refer to Figure 7 The first electrode 211 and the third electrode 221 of each light emitting element 200 may be independent and insulated from each other. At least part of the pixel driving circuit 130 in the array substrate 100 may be electrically connected to the first electrode 211, and at least part of the pixel driving circuit 130 may be electrically connected to the third electrode 221. The second electrode 212 and the fourth electrode 222 may be arranged in a whole layer, and the second electrode 212 and the fourth electrode 222 may be common electrodes, and the second electrode 212 and the fourth electrode 222 may be electrically connected through the common electrode overlapping hole 203. An insulating layer 310 may be arranged between each electrode, and the insulating layer 310 includes a pixel opening, and the pixel opening may define the position of the light emitting functional layer or the optical functional layer.

[0062] When the second electrode 212 is disposed in a whole layer, the second electrode 212 may include a plurality of electrode openings 201, so that the pixel electrode overlap hole 202 of the third electrode 221 may be electrically connected to the pixel driving circuit 130 of the array substrate 100 through the electrode opening 201. Alternatively, in other embodiments, the second electrodes 212 may also be independent of each other and insulated from each other, and the second electrode 212 may be electrically connected to the fourth electrode 222 of the same light-emitting element 200 through the common electrode overlap hole 203, and in this case, the fourth electrode 222 may still be disposed in a whole layer.

[0063] It can be understood that the display panel provided by the embodiment of the present invention may also include any known film layer structures such as a packaging layer, a touch layer, an optical layer, a cover plate (not shown in the figure) located on the side of the light-emitting element away from the array substrate, and the embodiment of the present invention will not be described one by one.

[0064] For example, Figure 8 is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention, referring to Figure 8, the light emitting element 200 may also be a mini LED or a micro LED, and the light emitting element 200 may include four electrode pins 204, which may be electrically connected to the first electrode 211, the second electrode 212, the third electrode 221, and the fourth electrode 222 in the light emitting element 200, respectively, and the electrode pins 204 may also be bound and connected to the pads 205 of the array substrate 100. In an optional embodiment, the first electrode 211 and the fourth electrode 222 may be electrically connected to different pixel driving circuits 130 through different electrode pins 204 and different pads 205, respectively, so as to realize time-sharing light emission of the first light emitting unit 210 and the second light emitting unit 220.

[0065] It should be noted that the pattern filled in the figure is only used to distinguish different film structures, and the pattern type is not used to distinguish the film materials. The same pattern type can be different film materials and different film structures, and the same film material can also be different filling patterns. In an optional embodiment, the first electrode 211 and the third electrode 221 can include different materials or the same material; the second electrode 212 and the fourth electrode 222 can include different materials or the same material; the first light-emitting functional layer 213 and the second light-emitting functional layer 223 can include different materials or the same material, which is not limited in the embodiment of the present invention.

[0066] Optional, continue to refer to Figure 7 and Figure 8 , along a direction perpendicular to the plane where the array substrate 100 is located, in the same light-emitting element 200 , the projection of the optical function layer 230 on the plane where the array substrate 100 is located covers the projection of the first light-emitting unit 210 on the plane where the array substrate 100 is located.

[0067] Exemplarily, the projection of the first light-emitting unit 210 on the plane where the array substrate 100 is located can be the overlapping area of ​​the projections of the first electrode 211, the second electrode 212 and the first light-emitting functional layer 213 in the first light-emitting unit 210 on the plane where the array substrate 100 is located. Since the first light-emitting unit 210 cannot emit light without any one or more of the first electrode 211, the second electrode 212 and the first light-emitting functional layer 213, the projection of the first light-emitting unit 210 on the plane where the array substrate 100 is located can also be the projection of the light-emitting area of ​​the first light-emitting unit 210 on the plane where the array substrate 100 is located.

[0068] Continuing with the example that both the light emitting side of the first light emitting unit 210 and the light emitting side of the second light emitting unit 220 are on the side away from the array substrate 100, and the light emitting element 200 is top emitting, the projection of the optical functional layer 230 on the plane where the array substrate 100 is located can cover the projection of the light emitting area of ​​the first light emitting unit 210 on the plane where the array substrate 100 is located, which means that the area of ​​the optical functional layer 230 located on the side of the first light emitting unit 210 away from the array substrate 100 is greater than or equal to the light emitting area of ​​the first light emitting unit 210, and the optical functional layer 230 can completely cover the light emitting area of ​​the first light emitting unit 210 away from the display substrate 100. In this way, the light emitted from the light emitting area of ​​the first light emitting unit 210 can pass through the optical functional layer 230, and the optical functional layer 230 can converge the light emitted from the light emitting area of ​​the first light emitting unit 210 to reduce the light at a large viewing angle and achieve an active anti-peeping effect.

[0069] In an optional embodiment, continue to refer to Figure 7 and Figure 8 , the first direction X is parallel to the plane where the array substrate 100 is located; in the same light-emitting element 200 , the length L23 of the optical functional layer 230 in the first direction X is greater than the length L21 of the first light-emitting unit 210 in the first direction X.

[0070] Specifically, the area of ​​the optical functional layer 230 is larger than the area of ​​the first light-emitting unit 210, that is, the area of ​​the optical functional layer 230 is larger than the light-emitting area of ​​the first light-emitting unit 210. At least part of the light emitted from the side of the first light-emitting unit 210 can also be converged by the optical functional layer 230 and then emitted from the display panel 001, which can further reduce the light with a wide viewing angle and achieve an effective anti-peeping effect. In addition, part of the light with a wide viewing angle may originally be unable to be emitted from the display panel, but can be emitted from the display panel after being converged by the optical functional layer 230, which is also beneficial to improve the luminous efficiency of the first light-emitting unit 210 and reduce the power consumption of the display panel 001.

[0071] In yet another optional embodiment, Fig. 9 is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention, referring to Fig. 9 The first light-emitting unit 210 includes a first electrode 211, a first light-emitting functional layer 213, and a second electrode 212 stacked in sequence; the second electrode 212 is located on the side of the first light-emitting functional layer 213 close to the optical functional layer 230; the first light-emitting functional layer 213 includes a first light-emitting surface E01 close to the first electrode 211, a second light-emitting surface E02 close to the second electrode 212, and a side light-emitting surface E03 connecting the first light-emitting surface E01 and the second light-emitting surface E02. In the same light-emitting element 200, the optical functional layer 230 is located on the light-emitting side of the second light-emitting surface E02, and the optical functional layer 230 is also located on the light-emitting side of at least part of the side light-emitting surface E03.

[0072] Exemplarily, taking the case where both the light emitting side of the first light emitting unit 210 and the light emitting side of the second light emitting unit 220 are on the side away from the array substrate 100, and the light emitting element 200 is top emitting, the light emitted from the first light emitting surface E01 and the side light emitting surface E03 of the first light emitting unit 210 can be emitted from the display panel 001 for display light emission, and the optical functional layer 230 can cover and wrap the first light emitting surface E01 and the side light emitting surface E03 of the first light emitting unit 210, so that the light emitted from the side of the first light emitting functional layer 213 of the first light emitting unit 210 can also be converged by the optical functional layer 230 and then emitted from the display panel 001, which can also reduce the wide viewing angle light effect, realize the anti-peeping display function, and is also beneficial to increase the light emitting efficiency of the first light emitting unit 210.

[0073] Optional, Fig.10 is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention, referring to Fig.10 The first light-emitting unit 210 includes a first electrode 211, a first light-emitting functional layer 213 and a second electrode 212 which are stacked in sequence; the display panel 001 also includes a light-shielding layer 320 located on the side of the first light-emitting functional layer 213 away from the array substrate 100; the light-shielding layer 320 includes a light-emitting opening 301; the light-emitting opening 301 is configured to expose the first light-emitting functional layer 213.

[0074] Exemplarily, taking the case where both the light emitting side of the first light emitting unit 210 and the light emitting side of the second light emitting unit 220 are on the side away from the array substrate 100, and the light emitting element 200 is top emitting, the shading layer 320 can block the light emitted from the side of the first light emitting functional layer 213 of the first light emitting unit 210 from emitting from the display panel 001, thereby reducing the light at a wide viewing angle, which is beneficial to reducing the brightness at a wide viewing angle, and further enhancing the anti-peeping effect of the display panel 001 in the anti-peeping mode.

[0075] It should be noted that the light-emitting opening 301 exposing the first light-emitting functional layer 213 means that, along a direction perpendicular to the plane where the array substrate 100 is located, the projection of the light-shielding layer 320 on the plane where the array substrate 100 is located does not overlap with at least a portion of the projection of the first light-emitting functional layer 213 on the plane where the array substrate 100 is located. The light-emitting opening 301 is configured to expose the first light-emitting functional layer 213, and it is not limited to the light-shielding layer 320 being arranged adjacent to the first light-emitting functional layer 213 on the side away from the array substrate 100, as long as the projection of at least a portion of the light-emitting opening 301 on the plane where the array substrate 100 is located can overlap with the projection of the first light-emitting functional layer 213 on the plane where the array substrate 100 is located.

[0076] The figure only shows that the shading layer 320 is located between the first light-emitting functional layer 213 and the second electrode 212 for example, but is not limited to this. In other optional embodiments, the shading layer 320 can also be located between the second electrode 212 and the optical functional layer 230, or between the optical functional layer 230 and the third electrode 221 of the second light-emitting unit 220, or between the third electrode 221 and the second light-emitting functional layer 223, as long as the first light-emitting functional layer 213 is located on the side of the shading layer 320 close to the array substrate 100, and the second light-emitting functional layer 223 is located on the side of the shading layer 320 away from the array substrate 100.

[0077] In an optional embodiment, Fig.11 is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention, referring to Fig.11 The light shielding layer 320 is located on the side of the second electrode 212 away from the array substrate 100 and on the side of the optical functional layer 230 close to the array substrate 100; the light shielding layer 320 can reuse the insulating layer 310 located between the second electrode 212 and the third electrode 221.

[0078] Exemplarily, light-shielding particles (not shown in the figure) and / or light-shielding materials may be provided in the insulating layer 310 between the second electrode 212 and the third electrode 221 to be reused as a light-shielding layer 320, and the light-shielding layer 320 may be in contact with and connected to the optical functional layer 230. For example, the light-emitting opening 301 of the light-shielding layer 320 may be used to limit the position of the optical functional layer 230. Taking the case where both the light emitting side of the first light emitting unit 210 and the light emitting side of the second light emitting unit 220 are on the side away from the array substrate 100, and the light emitting element 200 is top emitting, the shading layer 320 can reuse the insulating layer 310 located between the second electrode 212 and the third electrode 221, to ensure that the portion of the output light of the first light emitting unit 210 that is not blocked by the shading layer 320 can be emitted after being focused by the optical functional layer 230, and / or to ensure that the portion of the output light of the first light emitting unit 210 that is not focused by the optical functional layer 230 can be blocked by the shading layer 320, so as to reduce the light at a large viewing angle, reduce the brightness at a large viewing angle, and enhance the anti-peeping effect.

[0079] In yet another optional embodiment, reference Fig.10 and Fig.11 , along a direction perpendicular to the plane where the array substrate 100 is located, the projection of the light shielding layer 320 on the plane where the array substrate 100 is located overlaps with the projection of the first light-emitting functional layer 213 on the plane where the array substrate 100 is located.

[0080] Specifically, the projection of the light-emitting opening 301 on the plane where the array substrate 100 is located can be smaller than the projection of the first light-emitting unit 210 on the plane where the array substrate 100 is located, that is, the area of ​​the light-emitting opening 301 is smaller than the area of ​​the light-emitting region of the first light-emitting unit 210. In this way, the shading layer 320 can block the edge of the first light-emitting functional layer 213, so that the shading layer 320 can block the light emitted from the edge of the light-emitting region of the first light-emitting unit 210, which is beneficial to further display the wide viewing angle brightness of the panel 001 in the anti-peeping mode and enhance the active anti-peeping effect.

[0081] Optional, continue to refer to Fig.10 and Fig.11 , the first direction X is parallel to the plane where the array substrate 100 is located; in the same light emitting element 200 , the length L22 of the second light emitting unit 220 in the first direction X is greater than the length L21 of the first light emitting unit 210 in the first direction X.

[0082] Specifically, the area of ​​the second light-emitting unit 220 is larger than that of the first light-emitting unit 210, that is, the light-emitting region of the second light-emitting unit 220 is larger than that of the first light-emitting unit 210. The light-emitting region of the second light-emitting unit 220 is larger, which is beneficial to improving the aperture ratio of the light-emitting element 200, and the light-emitting region of the first light-emitting unit 210 is smaller, which is beneficial to reducing the brightness at a large viewing angle in the anti-peeping mode and improving the anti-peeping effect.

[0083] Optional, Fig.12 is a schematic diagram of a pixel driving circuit provided by an embodiment of the present invention, with reference to Fig.12 The pixel driving circuit 130 includes a driving part 133, a first switching part 131 and a second switching part 132; the driving part 133 is electrically connected to the first switching part 131 and the second switching part 132 respectively; the first switching part 131 is also electrically connected to the first light-emitting unit 210; the second switching part 132 is also electrically connected to the second light-emitting unit 220.

[0084] The driving unit 133 may provide driving current for the light emitting element 200 , and the driving unit 133 may include any combination known in the art, for example, the driving unit 133 may include a typical 2T1C circuit, or may include a typical 7T1C circuit, but is not limited thereto.

[0085] Exemplarily, in the anti-peeping mode, the first switch unit 131 is turned on and the second switch unit 132 is turned off, and the first light-emitting unit 210 can receive the driving current provided by the driving unit 133, and display light according to the driving current; in the normal mode, the first switch unit 131 is turned off and the second switch unit 132 is turned on, and the second light-emitting unit 220 can receive the driving current provided by the driving unit 133, and display light according to the driving current.

[0086] In this way, the first light-emitting unit 210 and the second light-emitting unit 220 of the light-emitting element 200 can be connected to the same driving part 133 of the same pixel driving circuit 130. Before and after switching the anti-peeping mode or the normal display mode, the first light-emitting unit 210 and the second light-emitting unit 220 of the same light-emitting element 200 can emit light in a time-sharing manner according to the same driving current, thereby reducing the impact on the display screen; in addition, the display panel 001 can switch between different display modes without introducing too many pixel driving circuits 130, which is beneficial to saving space of the display panel 001 and achieving a higher resolution.

[0087] Based on the same inventive concept, an embodiment of the present invention further provides a method for preparing a display panel, which is used to prepare the display panel of the embodiment of the present invention. Fig.13 is a schematic flow chart of a method for manufacturing a display panel provided by an embodiment of the present invention, such as Fig.13 As shown, the preparation method may include:

[0088] S1001. Provide an array substrate.

[0089] Exemplarily, the array substrate may include a base substrate and a circuit layer located on one side of the base substrate. The circuit layer may include a plurality of pixel driving circuits. The pixel driving circuits may provide driving currents for the light emitting elements.

[0090] S1002 , forming a plurality of first light emitting units on one side of an array substrate.

[0091] Exemplarily, the first light-emitting unit includes a first electrode, a first light-emitting functional layer, and a second electrode, which can be sequentially formed on one side of the array substrate. The first electrodes can be independent and insulated from each other, and at least part of the pixel driving circuit in the array substrate can be electrically connected to the first electrode 211.

[0092] S1003 , forming an optical function layer on a side of each first light emitting unit facing away from the array substrate.

[0093] Wherein, along a direction perpendicular to the plane where the array substrate is located, a projection of the optical function layer on the plane where the array substrate is located overlaps with a projection of the first light emitting unit on the plane where the array substrate is located.

[0094] In an optional embodiment, the optical functional layer located on the side of the first light-emitting unit away from the array substrate can be set as a whole layer; in another optional embodiment, the optical functional layers located on the side of each first light-emitting unit away from the array substrate can be independent of each other, and the optical functional layer is formed only above the first light-emitting unit.

[0095] S1004, forming a plurality of second light-emitting units corresponding to the first light-emitting units on a side of the optical function layer away from the array substrate.

[0096] Among them, along the direction perpendicular to the plane where the array substrate is located, the projection of the second light-emitting unit on the plane where the array substrate is located overlaps with the projection of the first light-emitting unit on the plane where the array substrate is located; along the direction perpendicular to the plane where the array substrate is located, the first light-emitting unit, the optical functional layer, and the second light-emitting unit whose projections overlap on the plane where the array substrate is located constitute a light-emitting element. In the same light-emitting element, the optical functional layer can change the optical properties of the first light-emitting unit and / or the second light-emitting unit. In an optional embodiment, the light-emitting element can be electrically connected to two pixel driving circuits, and the first light-emitting unit and the second light-emitting unit can be electrically connected to different pixel driving circuits respectively to achieve time-sharing light emission.

[0097] The display modes of the manufactured display panel include an anti-peeping mode and a normal mode; in the anti-peeping mode, in the same light-emitting element, the first light-emitting unit emits light and the second light-emitting unit does not emit light; in the normal mode, in the same light-emitting element, the first light-emitting unit does not emit light and the second light-emitting unit emits light.

[0098] In the embodiment of the present invention, by sequentially forming a first light-emitting unit, an optical functional layer, and a second light-emitting unit on an array substrate, the light-emitting element may include a first light-emitting unit and a second light-emitting unit that are sequentially stacked and capable of emitting light in a time-sharing manner, and an optical functional layer capable of changing the optical performance is placed between the first light-emitting unit and the second light-emitting unit, so that the emitted light of the first light-emitting unit can be converged, or the emitted light of the second light-emitting unit can be diffused, so that in the anti-peeping mode, when the first light-emitting unit is controlled to emit light alone, the light-emitting brightness of the light-emitting element at a large viewing angle can be weak, thereby realizing the anti-peeping display function; in the normal mode, when the second light-emitting unit is controlled to emit light alone, the light-emitting brightness of the light-emitting element at a large viewing angle can be strong, the anti-peeping function can be turned off, and the normal display function can be realized. In this way, the display panel manufactured can realize the anti-peeping function without the need for an external anti-peeping film, and it can be selected whether to turn on the anti-peeping function according to the user's usage scenario, thereby realizing flexible control of the anti-peeping function.

[0099] Optionally, a plurality of first light-emitting units are formed on one side of the array substrate, including: a first electrode, a first light-emitting functional layer and a second electrode are sequentially formed on one side of the array substrate; a plurality of second light-emitting units corresponding to the first light-emitting units are formed on a side of the optical functional layer away from the array substrate, including: a third electrode, a second light-emitting functional layer and a fourth electrode are sequentially formed on a side of the optical functional layer away from the array substrate; the preparation method further includes: after forming the second light-emitting functional layer and before forming the second light-emitting functional layer, forming a light-shielding layer; the light-shielding layer includes a light-emitting opening; the light-emitting opening is configured to expose the first light-emitting functional layer.

[0100] For example, taking the top-emitting light-emitting element as an example, the shading layer can block the light emitted from the side of the first light-emitting functional layer of the first light-emitting unit from emitting from the display panel, thereby reducing the light at a wide viewing angle, which is beneficial to reducing the brightness at a wide viewing angle and further enhancing the anti-peeping effect of the display panel in the anti-peeping mode.

[0101] The method for preparing a display panel provided in an embodiment of the present invention is used to prepare the display panel provided in any embodiment of the present invention, and has corresponding technical features and beneficial effects of the display panel. For contents not fully described in the embodiment of the method for preparing a display panel, refer to the above description of the display panel and will not be repeated here. Similarly, the display panel provided in an embodiment of the present invention also has functional modules and beneficial effects capable of executing the display panel provided in an embodiment of the present invention. For contents not fully described in the embodiment of the display panel, refer to the above description of the method for preparing a display panel and will not be repeated here.

[0102] Based on the same inventive concept, an embodiment of the present invention further provides a display device, Fig.14 is a schematic diagram of the structure of a display device provided by an embodiment of the present invention, such as Fig.14 The display device 002 includes a display panel 001 provided by any embodiment of the present invention. The display device 002 provided by the embodiment of the present invention can be Fig.14 The mobile phone shown can also be any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop displays, tablet computers, digital cameras, smart bracelets, smart glasses, car displays, medical equipment, industrial control equipment, touch interactive terminals, etc. The embodiments of the present invention do not specifically limit this.

[0103] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that: include: An array substrate, and a plurality of light emitting elements arranged on one side of the array substrate; The light-emitting element comprises a first light-emitting unit, an optical function layer, and a second light-emitting unit which are stacked in sequence; the first light-emitting unit is located on a side of the optical function layer close to the array substrate, and the second light-emitting unit is located on a side of the optical function layer away from the array substrate; The display mode of the display panel includes an anti-peeping mode and a normal mode; In the anti-peeping mode, in the same light-emitting element, the first light-emitting unit emits light, and the second light-emitting unit does not emit light; In the normal mode, in the same light emitting element, the first light emitting unit does not emit light, and the second light emitting unit emits light.

2. The display panel according to claim 1, characterized in that: In the anti-peeping mode, the light emitting brightness of the light emitting element at a preset viewing angle is a first brightness; in the normal mode, the light emitting brightness of the light emitting element at the same preset viewing angle is a second brightness; the preset viewing angle is greater than zero degrees and less than ninety degrees; At the same height distance from the light-emitting element, the first brightness is smaller than the second brightness.

3. The display panel according to claim 1, characterized in that: The refractive index of the optical functional layer is greater than the refractive index of at least a portion of the film layer in the first light-emitting unit.

4. The display panel according to claim 1, characterized in that: The optical function layer comprises a second surface close to the second light emitting unit, and the second surface is convex toward the second light emitting unit; And / or, the optical function layer includes a first surface close to the first light emitting unit, and the first surface protrudes toward the first light emitting unit.

5. The display panel according to claim 4, characterized in that: The second light emitting unit includes a third surface away from the array substrate; the third surface protrudes in a direction away from the array substrate.

6. The display panel according to claim 1, characterized in that: The optical functional layer comprises a first sub-functional layer and a second sub-functional layer; the first sub-functional layer is located on a side of the second sub-functional layer close to the first light-emitting unit; the refractive index of the second sub-functional layer is greater than the refractive index of the first sub-functional layer; The first sub-functional layer includes a third surface close to the second sub-functional layer, the second sub-functional layer includes a fourth surface close to the first sub-functional layer, and the third surface is in contact with the fourth surface; The fourth surface protrudes toward the first sub-functional layer.

7. The display panel according to claim 1, characterized in that: The first light-emitting unit comprises a first electrode, a first light-emitting functional layer, and a second electrode stacked in sequence; the second electrode is located on a side of the first light-emitting functional layer close to the optical functional layer; The second light-emitting unit comprises a third electrode, a second light-emitting functional layer and a fourth electrode stacked in sequence; the third electrode is located on a side of the second light-emitting functional layer close to the optical functional layer; In the same light-emitting element, the second electrode and the third electrode are insulated from each other.

8. The display panel according to claim 1, characterized in that: Along a direction perpendicular to the plane where the array substrate is located, in the same light-emitting element, the projection of the optical functional layer on the plane where the array substrate is located covers the projection of the first light-emitting unit on the plane where the array substrate is located.

9. The display panel according to claim 8, characterized in that: The first direction is parallel to the plane where the array substrate is located; in the same light-emitting element, the length of the optical functional layer in the first direction is greater than the length of the first light-emitting unit in the first direction.

10. The display panel according to claim 8, characterized in that: The first light-emitting unit comprises a first electrode, a first light-emitting functional layer, and a second electrode stacked in sequence; the second electrode is located on a side of the first light-emitting functional layer close to the optical functional layer; The first light-emitting functional layer includes a first light-emitting surface close to the first electrode, a second light-emitting surface close to the second electrode, and a side light-emitting surface connecting the first light-emitting surface and the second light-emitting surface; In the same light-emitting element, the optical functional layer is located on the light-emitting side of the second light-emitting surface, and the optical functional layer is also located on the light-emitting side of at least part of the side light-emitting surface.

11. The display panel according to claim 1, characterized in that: The first light-emitting unit includes a first electrode, a first light-emitting functional layer, and a second electrode stacked in sequence; the display panel also includes a light-shielding layer located on a side of the first light-emitting functional layer away from the array substrate; The light shielding layer includes a light emitting opening; the light emitting opening is configured to expose the first light emitting functional layer.

12. The display panel according to claim 11, characterized in that: Along a direction perpendicular to the plane where the array substrate is located, a projection of the light shielding layer on the plane where the array substrate is located overlaps with a projection of the first light-emitting functional layer on the plane where the array substrate is located.

13. The display panel according to claim 1, characterized in that: The first direction is parallel to the plane where the array substrate is located; in the same light-emitting element, the length of the second light-emitting unit in the first direction is greater than the length of the first light-emitting unit in the first direction.

14. The display panel according to claim 1, characterized in that: The array substrate includes a plurality of pixel driving circuits; the pixel driving circuit includes a driving unit, a first switching unit and a second switching unit; The driving part is electrically connected to the first switch part and the second switch part respectively; the first switch part is also electrically connected to the first light emitting unit; the second switch part is also electrically connected to the second light emitting unit.

15. A method for preparing a display panel, characterized in that: include: Providing an array substrate; forming a plurality of first light emitting units on one side of the array substrate; forming an optical function layer on a side of each of the first light-emitting units away from the array substrate; Along a direction perpendicular to the plane where the array substrate is located, a projection of the optical function layer on the plane where the array substrate is located overlaps with a projection of the first light-emitting unit on the plane where the array substrate is located; A plurality of second light-emitting units are formed on a side of the optical functional layer away from the array substrate and arranged corresponding to the first light-emitting unit; along a direction perpendicular to the plane where the array substrate is located, the projection of the second light-emitting unit on the plane where the array substrate is located overlaps with the projection of the first light-emitting unit on the plane where the array substrate is located; along a direction perpendicular to the plane where the array substrate is located, the first light-emitting unit, the optical functional layer, and the second light-emitting unit whose projections overlap on the plane where the array substrate is located constitute a light-emitting element; The display mode of the display panel includes an anti-peeping mode and a normal mode; in the anti-peeping mode, in the same light-emitting element, the first light-emitting unit emits light, and the second light-emitting unit does not emit light; In the normal mode, in the same light emitting element, the first light emitting unit does not emit light, and the second light emitting unit emits light.

16. The method for preparing a display panel according to claim 15, characterized in that: A plurality of first light emitting units are formed on one side of the array substrate, including: Forming a first electrode, a first light-emitting functional layer, and a second electrode in sequence on one side of the array substrate; A plurality of second light emitting units are formed on a side of the optical function layer away from the array substrate and arranged corresponding to the first light emitting unit, including Forming a third electrode, a second light-emitting functional layer and a fourth electrode in sequence on a side of the optical functional layer away from the array substrate; The preparation method further comprises: After forming the second light-emitting functional layer and before forming the second light-emitting functional layer, a light-shielding layer is formed; the light-shielding layer includes a light-emitting opening; and the light-emitting opening is configured to expose the first light-emitting functional layer.

17. A display device, characterized in that: include: The display panel according to any one of claims 1 to 14.

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