Display panel and manufacturing method thereof, and display device

Abstract

A display panel, a method for manufacturing the same, and a display device. The display panel comprises: a substrate, a first display panel, and a second display panel disposed on opposite sides of the substrate. In a direction away from the substrate, the first display panel comprises a plurality of light-emitting devices and a first color filter layer disposed sequentially. The second display panel comprises an array substrate and an opposite substrate disposed sequentially, and a liquid crystal layer disposed between the array substrate and the opposite substrate. The first display panel is configured to perform display, and at least some of the plurality of light-emitting devices are configured to provide backlight to the second display panel, thereby facilitating the second display panel's display.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the field of display technology, and in particular to a display panel, a method for manufacturing the same, and a display device. Background Art

[0002] As electronic products diversify their display formats, dual-sided displays are becoming a key feature of the new generation. In applications such as bank counters and one-on-one teaching, dual-sided display panels can reduce the number of display devices and improve information synchronization speed.

[0003] The inventors of the present application have discovered through research that the existing double-sided display panel has the problem of low light extraction efficiency. Summary of the Invention

[0004] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0005] Embodiments of the present disclosure provide a display panel, a method for manufacturing the same, and a display device to solve the problem of low light extraction efficiency of a double-sided display display panel.

[0006] In a first aspect, an embodiment of the present disclosure provides a display panel comprising: a substrate, a first display panel and a second display panel arranged on opposite sides of the substrate; in a direction away from the substrate, the first display panel comprises a plurality of light-emitting devices and a first color film layer arranged in sequence, the second display panel comprises an array substrate and an opposite substrate arranged in sequence, and a liquid crystal layer arranged between the array substrate and the opposite substrate; the first display panel is configured to perform display, and at least some of the plurality of light-emitting devices are configured to provide backlight to the second display panel for the second display panel to perform display.

[0007] In an exemplary embodiment, the plurality of light-emitting devices include a first type of light-emitting devices and a second type of light-emitting devices, the first type of light-emitting devices are configured to provide display for the first display panel, and the second type of light-emitting devices are configured to provide backlight to the second display panel; in a direction away from the substrate, the first type of light-emitting devices include a first anode, a first organic light-emitting layer and a first cathode arranged in sequence, and the second type of light-emitting devices include a second anode, a second organic light-emitting layer and a second cathode arranged in sequence.

[0008] In an exemplary embodiment, the thickness of the first anode is set to be greater than the thickness of the second anode; the thickness of the first anode is the distance between the surface of the first anode close to the substrate and the surface of the first anode away from the substrate, and the thickness of the second anode is the distance between the surface of the second anode close to the substrate and the surface of the second anode away from the substrate.

[0009] In an exemplary embodiment, the thickness of the second cathode is set to be greater than the thickness of the first cathode; the thickness of the second cathode is the distance between the surface of the second cathode close to the substrate and the surface of the second cathode away from the substrate, and the thickness of the first cathode is the distance between the surface of the first cathode close to the substrate and the surface of the first cathode away from the substrate.

[0010] In an exemplary embodiment, the first display panel further includes a plurality of light shielding portions arranged on a side of the light emitting device close to the substrate, and the orthographic projections of the light shielding portions on the substrate at least partially overlap with the orthographic projections of the first type of light emitting device on the substrate.

[0011] In an exemplary embodiment, the first display panel further includes a lens layer disposed on a side of the light-emitting device close to the substrate, the lens layer including a plurality of first lenses configured to focus light emitted by the second type of light-emitting device toward a center direction of the first lens.

[0012] In an exemplary embodiment, the first display panel further includes a driving structure layer arranged on a side of the light-emitting device close to the substrate, the driving structure layer including a pixel driving circuit; the pixel driving circuit includes a first transistor and a second transistor, the second transistor being located on a side of the first transistor away from the substrate, the orthographic projection of the second transistor on the substrate at least partially overlapping the orthographic projection of the first transistor on the substrate; the second transistor is connected to the anode of the light-emitting device, and the first transistor and the second transistor are connected.

[0013] In an exemplary embodiment, the active layer material of the first transistor is polysilicon, and the active layer material of the second transistor is oxide semiconductor.

[0014] In an exemplary embodiment, the opposite substrate includes a black matrix and a second color filter layer sequentially arranged facing the base; the orthographic projection of the black matrix on the base at least partially overlaps with the orthographic projection of the light-emitting device on the base.

[0015] In an exemplary embodiment, the display panel further includes a plurality of reflective portions arranged on a side of the substrate close to the light-emitting device, the reflective portions being configured to reflect ambient light from a side of the second display panel; the orthographic projection of the reflective portions on the substrate at least partially overlaps with the orthographic projection of the black matrix on the substrate.

[0016] In an exemplary embodiment, the substrate is a flexible substrate, and a surface of the substrate close to the second display panel includes a plurality of anti-reflection holes.

[0017] In an exemplary embodiment, the substrate is made of optical adhesive.

[0018] In an exemplary embodiment, the light emitting device is a white organic light emitting diode or a white light diode.

[0019] In a second aspect, an embodiment of the present disclosure provides a display device comprising the display panel as described above.

[0020] In a third aspect, an embodiment of the present disclosure provides a method for preparing a display panel, the method comprising: forming a first display panel and a second display panel on opposite sides of a substrate, respectively; in a direction away from the substrate, the first display panel comprises a plurality of light-emitting devices and a first color film layer arranged in sequence, and the second display panel comprises an array substrate and an opposite substrate arranged in sequence, and a liquid crystal layer arranged between the array substrate and the opposite substrate; the first display panel is configured to perform display, and at least some of the plurality of light-emitting devices are configured to provide backlight to the second display panel for the second display panel to perform display.

[0021] The display panel proposed in the embodiments of the present disclosure utilizes the light-emitting devices of the first display panel as the backlight source for the second display panel, thereby improving the light output of the second display panel and reducing the overall power consumption of the display panels. The first and second display panels can display different content, enabling dual-screen interaction and full-color display. This solves the problem of low light output efficiency in existing double-sided display panels.

[0022] Still other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation to the technical solution of the present disclosure.

[0024] Figure 1 This is a schematic diagram of a scenario where a user conducts business at a bank counter;

[0025] Figure 2 for Figure 1 Schematic diagram of double-sided display panels on the user side and staff side;

[0026] Figure 3 is a schematic cross-sectional view of a display panel in an exemplary embodiment of the present disclosure;

[0027] Figure 4 A schematic plan view of the structure of a first display panel in an exemplary embodiment of the present disclosure;

[0028] Figure 5is a schematic cross-sectional view of a display panel in yet another exemplary embodiment;

[0029] Figure 6 is a schematic cross-sectional view of a display panel in yet another exemplary embodiment;

[0030] Figure 7 A schematic cross-sectional view of a display panel in yet another exemplary embodiment;

[0031] Figure 8 FIG. 4 is a schematic cross-sectional view of a display panel in yet another exemplary embodiment. DETAILED DESCRIPTION

[0032] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Note that the embodiments can be implemented in a variety of different forms. A person skilled in the art can easily understand that the methods and contents can be transformed into various forms without departing from the purpose and scope of the present disclosure. Therefore, the present disclosure should not be interpreted as being limited to the contents described in the following embodiments. In the absence of conflict, the embodiments in the present disclosure and the features in the embodiments can be combined with each other in any way.

[0033] The scales of the figures in this disclosure can be used as a reference for actual processes, but are not limited to this. For example, the width-to-length ratio of the channel, the thickness and spacing of each film layer, and the width and spacing of each signal line can be adjusted according to actual needs. The number of pixels in the display panel and the number of sub-pixels in each pixel are not limited to the numbers shown in the figures. The figures described in this disclosure are only structural schematics, and one embodiment of the present disclosure is not limited to the shapes or values ​​shown in the figures.

[0034] In this specification, ordinal numbers such as “first”, “second” and “third” are provided to avoid confusion among constituent elements, and are not intended to limit the number.

[0035] In this specification, for convenience, words and phrases indicating orientation or positional relationships, such as "middle," "upper," "lower," "front," "back," "vertical," "horizontal," "top," "bottom," "inside," and "outside," are used to illustrate the positional relationships of constituent elements with reference to the accompanying drawings. This is merely for the purpose of facilitating the description of this specification and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present disclosure. The positional relationships of constituent elements may be appropriately changed depending on the direction in which each constituent element is described. Therefore, the present disclosure is not limited to the words and phrases described in the specification and may be appropriately replaced according to the circumstances.

[0036] In this specification, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct connections, indirect connections through intermediaries, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure.

[0037] In this specification, a transistor refers to a device that includes at least three terminals: a gate electrode, a drain electrode, and a source electrode. A transistor has a channel region between a drain electrode (drain electrode terminal, drain region, or drain electrode) and a source electrode (source electrode terminal, source region, or source electrode), and current can flow through the drain electrode, the channel region, and the source electrode. Note that in this specification, the channel region refers to the region through which current primarily flows.

[0038] In this specification, the first electrode can be a drain electrode and the second electrode can be a source electrode, or vice versa. The functions of "source electrode" and "drain electrode" may be interchanged when using transistors with opposite polarity or when the direction of current changes during circuit operation. Therefore, in this specification, "source electrode" and "drain electrode" can be interchanged, and "source terminal" and "drain terminal" can be interchanged.

[0039] In this specification, "electrically connected" includes components connected together via an element having some electrical function. There are no particular limitations on the "element having some electrical function" as long as it enables transmission of electrical signals between the connected components. Examples of "element having some electrical function" include not only electrodes and wiring, but also switching elements such as transistors, resistors, inductors, capacitors, and other components with various functions.

[0040] In this specification, "parallel" refers to a state where the angle formed by two straight lines is greater than -10° and less than 10°, and thus also includes a state where the angle is greater than -5° and less than 5°. Furthermore, "perpendicular" refers to a state where the angle formed by two straight lines is greater than 80° and less than 100°, and thus also includes a state where the angle is greater than 85° and less than 95°.

[0041] In this specification, the terms "film" and "layer" may be interchanged. For example, "conductive layer" may be replaced with "conductive film." Similarly, "insulating film" may be replaced with "insulating layer."

[0042] The triangles, rectangles, trapezoids, pentagons or hexagons in this specification are not in the strict sense, but may be approximate triangles, rectangles, trapezoids, pentagons or hexagons, etc. There may be some small deformations caused by tolerances, and there may be chamfers, arc edges and deformations.

[0043] The term "about" in the present disclosure refers to a numerical value that is not strictly defined and allows for process and measurement errors.

[0044] Figure 1 This diagram illustrates a scenario where a user conducts business at a bank counter. In this scenario, staff members are located inside the counter, while users are located outside. Traditionally, two separate display devices are used for interaction, requiring a large number of devices and resulting in high costs. Furthermore, information needs to be transferred between the two devices, leading to slow synchronization. To address this issue, a dual-sided display panel has been proposed. In this scenario, staff members and users can interact using a single display device. Figure 2 for Figure 1 Schematic diagram of double-sided display panels used on the user side and the staff side. Figure 2 As shown, the user-facing side can be the front of the display panel, which can be used to provide a confirmation interface for the user. The side facing the bank staff can be the back of the display panel, which can be used to provide the bank staff with a business operation interface. Within a single display device, information synchronization is faster, improving the interactive experience between users and staff and saving costs. In other similar application scenarios, such as one-on-one teaching and store counters, double-sided display panels can also be used to reduce costs and improve the experience.

[0045] The inventors of this application have discovered a display panel that uses white organic light emitting diodes (WOLEDs) on both sides of the display. While displaying consistent content on both sides, it also consumes high power and has low light extraction efficiency. Existing display panels with other types of double-sided displays all suffer from low light extraction efficiency.

[0046] An embodiment of the present disclosure provides a display panel, comprising: a substrate, a first display panel and a second display panel arranged on opposite sides of the substrate; in a direction away from the substrate, the first display panel comprises a plurality of light-emitting devices and a first color film layer arranged in sequence, and the second display panel comprises an array substrate and an opposite substrate arranged in sequence, and a liquid crystal layer arranged between the array substrate and the opposite substrate; the first display panel is configured to perform display, and at least some of the plurality of light-emitting devices are configured to provide backlight to the second display panel so that the second display panel can perform display.

[0047] The display panel proposed in the embodiments of the present disclosure utilizes the light-emitting devices of the first display panel as the backlight source of the second display panel, thereby improving the light output of the second display panel and saving the overall power consumption of the display panels. The first and second display panels can display different images, enabling dual-screen interaction and full-color display.

[0048] In an exemplary embodiment, the plurality of light-emitting devices include a first type of light-emitting devices and a second type of light-emitting devices, the first type of light-emitting devices are configured to provide display for the first display panel, and the second type of light-emitting devices are configured to provide backlight to the second display panel; in a direction away from the substrate, the first type of light-emitting devices include a first anode, a first organic light-emitting layer and a first cathode arranged in sequence, and the second type of light-emitting devices include a second anode, a second organic light-emitting layer and a second cathode arranged in sequence.

[0049] In an exemplary embodiment, the thickness of the first anode is set to be greater than the thickness of the second anode; the thickness of the first anode is the distance between the surface of the first anode close to the substrate and the surface of the first anode away from the substrate, and the thickness of the second anode is the distance between the surface of the second anode close to the substrate and the surface of the second anode away from the substrate.

[0050] In an exemplary embodiment, the thickness of the second cathode is set to be greater than the thickness of the first cathode; the thickness of the second cathode is the distance between the surface of the second cathode close to the substrate and the surface of the second cathode away from the substrate, and the thickness of the first cathode is the distance between the surface of the first cathode close to the substrate and the surface of the first cathode away from the substrate.

[0051] In an exemplary embodiment, the first display panel further includes a plurality of light shielding portions arranged on a side of the light emitting device close to the substrate, and the orthographic projections of the light shielding portions on the substrate at least partially overlap with the orthographic projections of the first type of light emitting device on the substrate.

[0052] In an exemplary embodiment, the first display panel further includes a lens layer disposed on a side of the light-emitting device close to the substrate, the lens layer including a plurality of first lenses configured to focus light emitted by the second type of light-emitting device toward a center direction of the first lens.

[0053] In an exemplary embodiment, the first display panel further includes a driving structure layer arranged on a side of the light-emitting device close to the substrate, the driving structure layer including a pixel driving circuit; the pixel driving circuit includes a first transistor and a second transistor, the second transistor being located on a side of the first transistor away from the substrate, the orthographic projection of the second transistor on the substrate at least partially overlapping the orthographic projection of the first transistor on the substrate; the second transistor is connected to the anode of the light-emitting device, and the first transistor and the second transistor are connected.

[0054] In an exemplary embodiment, the active layer material of the first transistor is polysilicon, and the active layer material of the second transistor is oxide semiconductor.

[0055] In an exemplary embodiment, the opposite substrate includes a black matrix and a second color filter layer sequentially arranged facing the base; the orthographic projection of the black matrix on the base at least partially overlaps with the orthographic projection of the light-emitting device on the base.

[0056] In an exemplary embodiment, the display panel further includes a plurality of reflective portions arranged on a side of the substrate close to the light-emitting device, the reflective portions being configured to reflect ambient light from a side of the second display panel; the orthographic projection of the reflective portions on the substrate at least partially overlaps with the orthographic projection of the black matrix on the substrate.

[0057] In an exemplary embodiment, the substrate is a flexible substrate, and a surface of the substrate close to the second display panel includes a plurality of anti-reflection holes.

[0058] In an exemplary embodiment, the substrate is made of optical adhesive.

[0059] In an exemplary embodiment, the light emitting device is a white organic light emitting diode or a white light diode.

[0060] Figure 3 FIG. 1 is a cross-sectional diagram of a display panel in an exemplary embodiment of the present disclosure, illustrating the structure of two sub-pixels. Figure 3As shown, the display panel may include a substrate 400 and a first display panel and a second display panel arranged on opposite sides of the substrate 400. The first display panel may be a WOLED display panel, and the second display panel may be a liquid crystal display (LCD) panel. In the direction away from the substrate 400, the first display panel may include a driving structure layer 20 arranged on the substrate 400, a light emitting structure layer 21 arranged on the side of the driving structure layer 20 away from the substrate 400, and a first color filter layer 117 arranged on the side of the light emitting structure layer away from the substrate 400. The light emitting structure layer 21 may include a plurality of first-type light emitting devices and a plurality of second-type light emitting devices, the first-type light emitting devices being configured to provide display for the first display panel, and the second-type light emitting devices being configured to provide backlight to the second display panel.

[0061] In an exemplary embodiment, the driving structure layer 20 may include a plurality of transistors and storage capacitors constituting a pixel driving circuit to drive the corresponding light-emitting devices in the light-emitting structure layer 21 to emit light. The light-emitting structure layer 21 may include an anode, a pixel definition layer 112, an organic light-emitting layer, and a cathode. The organic light-emitting layer may include a plurality of light-emitting devices arranged in an array, and the light-emitting devices may be white organic light-emitting diodes. The first color filter layer 117 may include a plurality of color films of different colors, and the overlapping portions of adjacent color films may act as a black matrix. Alternatively, the first color filter layer 117 may include a first black matrix and a plurality of color films of different colors, and the first black matrix includes a plurality of pixel openings. The color films may be located within the pixel openings, and the light emitted by the light-emitting devices is displayed as light of different colors after passing through the first color filter layer 117. The present disclosure is not limited thereto.

[0062] Figure 4 FIG. 1 is a schematic diagram of a planar structure of a first display panel in an exemplary embodiment of the present disclosure. Figure 4 As shown, the display panel may include a plurality of pixel units P arranged in a matrix. At least one of the plurality of pixel units P includes a first subpixel P1 that emits a first color light, a second subpixel P2 that emits a second color light, and a third subpixel P3 that emits a third color light. The first subpixel P1, the second subpixel P2, and the third subpixel P3 each include a pixel driving circuit, a light-emitting device, and a first color filter layer 117. The pixel driving circuits in the first subpixel P1, the second subpixel P2, and the third subpixel P3 are respectively connected to a scan signal line, a data signal line, and a light-emitting signal line. The pixel driving circuits are configured to receive data voltages transmitted by the data signal lines under the control of the scan signal lines and the light-emitting signal lines and output corresponding currents to the light-emitting devices. The light-emitting devices in the first subpixel P1, the second subpixel P2, and the third subpixel P3 are respectively connected to the pixel driving circuits of the subpixels in which they are located. The light-emitting devices are configured to emit light of corresponding brightness in response to the currents output by the pixel driving circuits of the subpixels in which they are located.

[0063] In an exemplary embodiment, a pixel unit P may include a red (R) sub-pixel, a green (G) sub-pixel, and a blue (B) sub-pixel. In an exemplary embodiment, the sub-pixels in the pixel unit may be rectangular, diamond-shaped, pentagonal, or hexagonal. The three sub-pixels may be arranged horizontally, vertically, or in a herringbone pattern, or may adopt RealRGB, SRGB, or diamond-like arrangements, which are not limited in this disclosure.

[0064] In an exemplary embodiment, a white organic light emitting diode (OLED) may be provided in the pixel unit P. A blue color film, a green color film, and a red color film may be provided on the first color film layer 117 on the side of the first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3 away from the substrate 400, respectively. After the light emitted by the white organic light emitting diode passes through the color films of the corresponding colors, the areas corresponding to the first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3 may emit blue, green, and red light, respectively. The luminous colors of the first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3 may be set as needed, and the present disclosure is not limited thereto. In other embodiments, the pixel unit P may include a red (R) sub-pixel, a green (G) sub-pixel, a blue (B) sub-pixel, and a white (W) sub-pixel (not shown), and the present disclosure is not limited thereto.

[0065] In an exemplary embodiment, the pixel definition layer is provided with a pixel opening, and a single light-emitting device is provided within the corresponding pixel opening. The light-emitting device includes an anode, an organic light-emitting layer, and a cathode stacked sequentially in a direction away from the substrate 400. In an exemplary embodiment, the first type of light-emitting device in the light-emitting structure layer 21 may include a first anode 111A, a first organic light-emitting layer 113A, and a first cathode 114A, and the second type of light-emitting device in the light-emitting structure layer 21 may include a second anode 111B, a second organic light-emitting layer 113B, and a second cathode 114B.

[0066] In an exemplary embodiment, the first anode 111A and the second anode 111B may be made of a metal material, a transparent conductive material, or a multilayer composite structure of a metal material and a transparent conductive material. The metal material may include any one or more of silver (Ag), copper (Cu), aluminum (Al), titanium (Ti), and molybdenum (Mo), or an alloy material of the above metals. The transparent conductive material may include indium tin oxide (ITO) or indium zinc oxide (IZO). The multilayer composite structure may be ITO / Al / ITO, ITO / Ag / ITO, or the like.

[0067] In an exemplary embodiment, the thickness of the first anode 111A may be greater than the thickness of the second anode 111B. The thickness of the first anode 111A may be the distance between the surface of the first anode 111A on the side close to the substrate 400 and the surface on the side away from the substrate 400. The thickness of the second anode 111B may be the distance between the surface of the second anode 111B on the side close to the substrate 400 and the surface on the side away from the substrate 400. By thinning the second anode 111B, more light from the second type of light-emitting device can pass through the second anode 111B and enter the second display panel, thereby improving light utilization. For example, when the structure of the second anode 111B is a stacked structure of ITO / Ag / ITO, the thickness of the metallic silver can be set to be greater than or equal to 9 nanometers and less than or equal to 22 nanometers. In an exemplary embodiment, the thickness of the metallic silver can be set to be greater than or equal to 10 nanometers and less than or equal to 20 nanometers. After research, the inventors of the present application found that, under the same conditions, by thinning the metallic silver of the second anode 111B to 10 nanometers to 20 nanometers, the light utilization rate can be increased by about 40% to 70%. In other embodiments, a transparent conductive material can be used to form the second anode 111B, and the material and size of the second anode 111B can be set as needed, and the present disclosure does not limit this.

[0068] In an exemplary embodiment, the material of the first cathode 114A and the second cathode 114B may be any one or more of magnesium (Mg), silver (Ag), aluminum (Al), copper (Cu), and lithium (Li), or an alloy made of any one or more of the foregoing metals.

[0069] In an exemplary embodiment, the thickness of the second cathode 114B may be greater than the thickness of the first cathode 114A. The thickness of the second cathode 114B may be the distance between the surface of the second cathode 114B on the side close to the substrate 400 and the surface on the side away from the substrate 400, while the thickness of the first cathode 114A may be the distance between the surface of the first cathode 114A on the side close to the substrate 400 and the surface on the side away from the substrate 400. Light emitted by the second type of light-emitting device is reflected by the second cathode 114B and illuminates the second display panel. By thickening the second cathode 114B, the reflectivity of the second cathode 114B to light can be increased, thereby improving the utilization rate of light from the second type of light-emitting device. In other embodiments, the second cathode 114B may be formed of aluminum (Al). Due to the high reflectivity of aluminum, it can reflect more light emitted by the second type of light-emitting device, thereby improving the utilization rate of light. The material and structure of the second cathode 114B can be set as needed, and this disclosure is not limited in this regard.

[0070] This embodiment, by thinning the anode and thickening the cathode of the second type of light-emitting device, can control the brightness of the light emitted by the second display panel to meet the actual needs of different scenarios. For example, in scenarios requiring high confidentiality, such as bank counters, the brightness of the light emitted by the second display panel can be controlled to be lower to prevent people from peeking at the screen. Specific settings can be made according to actual needs and are not limited by this disclosure.

[0071] In an exemplary embodiment, the first display panel further includes a plurality of light shielding portions 120. The orthographic projections of the light shielding portions 120 on the substrate 400 at least partially overlap with the orthographic projections of the first-type light-emitting devices on the substrate 400. The provision of the light shielding portions 120 prevents ambient light from the second display panel from affecting the normal display of the first display panel, thereby improving the display quality. The number of light shielding portions 120 can be set as needed; for example, the number of light shielding portions 120 can be less than the number of the first-type light-emitting devices, and this is not limited by the present disclosure.

[0072] In an exemplary embodiment, the orthographic projection of the light shielding portion 120 on the substrate 400 may cover the orthographic projection of the first type light emitting device on the substrate 400 .

[0073] In an exemplary embodiment, the orthographic projection of the light shielding portion 120 on the substrate 400 may be located within the range of the orthographic projection of the first type light emitting device on the substrate 400 .

[0074] This embodiment can control the brightness of the light emitted by the second display panel by providing the light shielding portion 120 to meet the actual needs of different scenes. The number of light shielding portions 120 and the orthographic projection relationship with the first type of light emitting device can be set according to actual needs, and this disclosure does not limit this.

[0075] In an exemplary embodiment, the first display panel may further include a pixel planarization layer 104, an encapsulation structure layer 115, a color filter planarization layer 116, and a first planarization layer 121. The pixel planarization layer 104 is located on the side of the driving structure layer 20 away from the substrate 400, facilitating the formation of an anode on the side of the pixel planarization layer 104 away from the substrate 400. The pixel planarization layer 104 may include vias to facilitate connection of the anode to the corresponding pixel driving circuit. The encapsulation structure layer 115 may be located on the side of the cathode away from the substrate 400. The encapsulation structure layer can protect the light-emitting device and may include a stacked first encapsulation layer, a second encapsulation layer, and a third encapsulation layer. The second encapsulation layer, made of an organic material, is disposed between the first and third encapsulation layers, made of an inorganic material. The color filter planarization layer 116 may be located on the side of the encapsulation structure layer 115 away from the substrate 400, facilitating the formation of a first color filter layer 117 on the side of the color filter planarization layer 116 away from the substrate 400.

[0076] In an exemplary embodiment, the substrate 400 may be an optical adhesive (OCA), and the substrate 400 made of an optical adhesive may fix the first display panel and the second display panel together.

[0077] In an exemplary embodiment, on a side of the first color filter layer 117 away from the substrate 400 , the first display panel may further include a first touch layer, a first polarizing layer, a first protective layer and other structures, which is not limited in the present disclosure.

[0078] In an exemplary embodiment, the light emitting device of the first display panel may also be a white light emitting diode (WLED). The light emitting device of the first display panel may also emit light of other colors, which is not limited in the present disclosure.

[0079] In an exemplary embodiment, the second display panel may be an LCD display panel. In a direction away from the substrate 400, the second display panel may include an array substrate and an opposite substrate, and a liquid crystal layer 500 disposed between the array substrate and the opposite substrate. The array substrate may include gate lines 201, data lines 205, a switching unit, pixel electrodes 210, and a common electrode 209. The common electrode 209 may be connected to a common voltage line. The pixel electrodes 210 and the common electrode 209 are used to generate an electric field that controls the deflection of liquid crystal molecules in the liquid crystal layer 500, thereby achieving a specific grayscale display. The switching unit may be electrically connected to the pixel electrode 210, the data line 205, and the gate line 201, respectively. The scanning signal transmitted by the gate line 201 may control the on and off of the switching unit. When the switching unit is turned on, the pixel voltage transmitted on the data line 205 may be output to the pixel electrode 210, achieving image display. The opposite substrate may include a black matrix 301 and a second color filter layer 302.

[0080] In an exemplary embodiment, the black matrix 301 includes a plurality of pixel openings, and the second color filter layer 302 includes a plurality of color films of different colors, which can be arranged in the corresponding pixel openings. By controlling the deflection of the liquid crystal molecules, the light from the second type of light emitting device of the first display panel is converted into light of different colors after passing through the second color filter layer 302 for display on the second display panel. The arrangement of the plurality of pixel units of the second display panel can be referred to Figure 4 , I will not go into details here.

[0081] In an exemplary embodiment, the orthographic projection of the black matrix 301 of the second display panel on the substrate 400 at least partially overlaps with the orthographic projection of the light-emitting devices of the first display panel on the substrate 400. By arranging the black matrix 301 and the light-emitting devices of the first display panel in a direction perpendicular to the substrate 400, when both the first and second display panels are displaying, the light emitted by the first display panel can be prevented from affecting the display of the second display panel, thereby improving the display effect.

[0082] In an exemplary embodiment, the orthographic projection of the black matrix 301 of the second display panel on the substrate 400 may cover the orthographic projection of the light emitting device of the first display panel on the substrate 400 .

[0083] In an exemplary embodiment, the orthographic projection of the black matrix 301 of the second display panel on the substrate 400 may be within the range of the orthographic projection of the light-emitting devices of the first display panel on the substrate 400. The orthographic projection relationship between the black matrix 301 and the light-emitting devices of the first display panel may be set as needed, and this disclosure is not limited thereto.

[0084] In an exemplary embodiment, the array substrate may include, in a direction away from the substrate 400, a first conductive layer, a first insulating layer 203, a semiconductor layer, a first transparent conductive layer, a second conductive layer, a second insulating layer 208, and a second transparent conductive layer. The first conductive layer includes at least a plurality of gate lines 201 and a plurality of control electrodes 202 for switching elements. The control electrodes 202 and the gate lines 201 may be integrally formed. The semiconductor layer includes an active layer 204 for the plurality of switching elements. The active layer 204 may include a channel region, a first doped region, and a second doped region. The channel region may be undoped and have semiconductor properties. The first doped region and the second doped region may be on either side of the channel region and doped with impurities, thereby imparting conductivity. The impurities may vary depending on the type of transistor (e.g., N-type or P-type). The first transparent conductive layer includes a plurality of pixel electrodes 210. The orthographic projections of the pixel electrodes 210 on the second base substrate 200 do not overlap with the orthographic projections of the active layer 204 on the second base substrate 200. The pixel electrodes 210 may be sheet-shaped electrodes. The second conductive layer includes at least a plurality of data lines 205, and a plurality of first electrodes 206 and second electrodes 207 of switching elements. The switching elements are located at the intersection of the gate lines 201 and the data lines 205. The first electrodes 206 of the switching elements overlap and are directly connected to the first doped region of the active layer 204, while the second electrodes 207 overlap and are directly connected to the second doped region of the active layer 204. The first electrodes 206 of the switching elements and the adjacent data lines 205 may be integrally formed. The pixel electrode 210 is located within the sub-pixel region formed by the intersection of the data lines 205 and the gate lines 201. The orthographic projection of the second electrodes 207 of the switching elements on the second base substrate 200 overlaps with the pixel electrode 210, and the second electrodes 207 of the switching elements are directly connected to the pixel electrode 210. The second transparent conductive layer includes at least a plurality of common electrodes 209. The common electrodes 209 of the multiple sub-pixels of a pixel unit may be integrally formed, and may be slit electrodes, having a single-domain or multi-domain structure.

[0085] In an exemplary embodiment, the opposite substrate may include a third base substrate 300, a black matrix 301 disposed on the third base substrate 300, a second color filter layer 302, and a second protective layer 304. The third base substrate 300 is located on a side away from the base 400. The third base substrate 300 may be a transparent substrate.

[0086] In an exemplary embodiment, a plurality of support portions 320 are provided between the array substrate and the opposite substrate. The support portions 320 help maintain a uniform distance between the array substrate and the opposite substrate. The support portions 320 may be made of an organic adhesive.

[0087] In an exemplary embodiment, the second display panel may further include a second touch layer, a second polarizing layer, a second protective layer and other structures (not shown), which are not limited in the present disclosure.

[0088] In an exemplary embodiment, LCDs can be classified into twisted nematic (TN) display mode, in-plane switching (IPS) display mode, fringe field switching (FFS) display mode, and advanced super dimension switch (ADS) display mode, etc., according to display modes. Figure 3 The ADS display mode is used as an example for illustration, and the present disclosure does not limit the display mode of the LCD.

[0089] In an exemplary embodiment, in the preparation of Figure 3 In the process of manufacturing the display panel shown, the first display panel and the second display panel can be prepared separately, and then the first display panel and the second display panel can be combined together using a base 400 made of optical adhesive. When preparing the first display panel, the drive structure layer 20 and other structures can be formed on the first base substrate, and then the first base substrate can be peeled off to form the light shielding portion 120 and the first flat layer 121. When preparing the second display panel, the array substrate can be prepared on the second base substrate, and the opposite substrate can be formed on the third base substrate 300. The array substrate and the opposite substrate can then be packaged together. Subsequently, the second base substrate can be peeled off, and the first display panel and the second display panel can be combined together using the base 400.

[0090] Figure 5 FIG. 1 is a schematic cross-sectional view of a display panel in another exemplary embodiment, illustrating the structure of two sub-pixels. Figure 5 and Figure 3 The difference is that it also includes a lens layer, which includes multiple first lenses 122. Other structures can refer to Figure 3 The description is not repeated here.

[0091] In an exemplary embodiment, the lens layer is located on a side of the light emitting structure layer close to the substrate 400. The lens layer includes a plurality of first lenses 122. The first lenses 122 are configured to focus the light emitted by the second type of light emitting device toward the center of the first lens 122. The center of the first lens 122 may be the geometric center of the first lens 122, thereby causing the light emitted by the second type of light emitting device to be more concentrated and emitted toward the second display panel. Figure 5 As shown, the lens layer may be located between the light shielding portion 120 and the first planar layer 121 .

[0092] In an exemplary embodiment, within a plane parallel to the substrate 400, the first lens 122 can have a triangular, circular, elliptical, quadrilateral, or other polygonal or irregular shape. Within a plane perpendicular to the substrate 400, the first lens 122 can have a trapezoidal, semicircular, or hexagonal shape, among other shapes, to help focus light emitted by the second type of light-emitting device and improve the light extraction efficiency of the second display panel. The inventors have discovered that, under the same conditions, providing a lens layer can improve the light extraction efficiency of the second display panel by approximately 10% to 20%.

[0093] In an exemplary embodiment, the refractive index of the first lens 122 may be greater than the refractive index of the first flat layer 121. The refractive angle of light entering the first flat layer 121 from the first lens 122 is smaller than the incident angle, so that the light entering the first lens 122 is deflected toward the center of the first lens 122 relative to the incident light. The greater the difference between the refractive index of the first lens 122 and the refractive index of the first flat layer 121, the greater the degree to which the light is deflected toward the center of the first lens 122.

[0094] By providing a lens layer in this embodiment, light emitted by the second type of light-emitting device can be more concentrated, thereby increasing the light extraction efficiency on the second display panel side, thereby increasing the brightness of the second display panel, facilitating dual-screen interaction, and providing a more user-friendly experience in application scenarios such as one-on-one teaching. The number, shape, and distribution of the first lenses 122 in the lens layer can be adjusted as needed to meet the requirements of different application scenarios, and this disclosure does not impose any restrictions on this.

[0095] Figure 5 In the display panel shown in FIG, after forming the light shielding portion 120, a first lens 122 can be formed by photolithography or other methods, and then a first flat layer 121 can be formed to facilitate subsequent connection with the substrate 400. The preparation process can refer to the above-mentioned Figure 3 The description is not repeated here.

[0096] Figure 6 FIG. 1 is a schematic cross-sectional view of a display panel in another exemplary embodiment, illustrating the structure of two sub-pixels. Figure 6 and Figure 5 The difference is that it also includes multiple reflective parts 123. Other structures can refer to Figure 5 The description is not repeated here.

[0097] In an exemplary embodiment, the display panel further includes a plurality of reflective portions 123, which can be disposed on a side of the driving structure layer 20 close to the substrate 400 and configured to reflect ambient light from the side of the second display panel. By providing the reflective portions 123, the second display panel can utilize the ambient light reflected by the reflective portions 123 for display, thereby increasing the light utilization efficiency of the second display panel and helping to save power consumption of the display panel.

[0098] In an exemplary embodiment, the orthographic projection of the light reflecting portion 123 on the substrate 400 may at least partially overlap with the orthographic projection of the black matrix 301 on the substrate 400 , so that ambient light is reflected by the light reflecting portion 123 and then emitted from the pixel openings of the black matrix 301 .

[0099] In an exemplary embodiment, the orthographic projection of the light reflecting portion 123 on the substrate 400 may be located within the range of the orthographic projection of the black matrix 301 on the substrate 400 .

[0100] In an exemplary embodiment, the orthographic projection of the light reflecting portion 123 on the substrate 400 may cover the orthographic projection of the black matrix 301 on the substrate 400 .

[0101] In an exemplary embodiment, the light reflecting portion 123 may be disposed on a side of the light shielding portion 120 close to the substrate 400 , and an orthographic projection of the light reflecting portion 123 on the substrate 400 at least partially overlaps with an orthographic projection of the light shielding portion 120 on the substrate 400 .

[0102] In an exemplary embodiment, the orthographic projection of the light reflecting portion 123 on the substrate 400 may be located within the range of the orthographic projection of the light shielding portion 120 on the substrate 400 .

[0103] In an exemplary embodiment, the orthographic projection of the light reflecting portion 123 on the substrate 400 may cover the orthographic projection of the light shielding portion 120 on the substrate 400 .

[0104] In an exemplary embodiment, the material of the reflective portion 123 may be a metal or alloy material such as silver or aluminum. The reflective portion 123 may be a single-layer metal or a multi-layer metal stacked structure, which is not limited in the present disclosure.

[0105] In practical applications, the number, position, orthographic projection relationship between the reflective portion 123 and the black matrix 301 and the orthographic projection relationship between the reflective portion 123 and the light shielding portion 120 can be set as needed, and this disclosure does not limit this.

[0106] In an exemplary embodiment, Figure 6 As shown, a first passivation layer 124 may be formed on the side of the reflective portion 123 close to the substrate 400 , and the lens layer and the first flat layer 121 may be disposed on the side of the first passivation layer 124 close to the substrate 400 , which is not limited in the present disclosure.

[0107] Figure 6 The preparation process of the display panel shown can refer to the above Figure 5 The description is not repeated here.

[0108] Figure 7 FIG. 1 is a schematic cross-sectional view of a display panel in another exemplary embodiment, illustrating the structure of two sub-pixels. Figure 7 and Figure 3 The difference is that it also includes a first polarizing layer 118, a first touch layer 119, a first adhesive layer 130 and a first protective layer 131. Figure 7 The structure of the middle substrate 401 and the driving structure layer 22 is also similar to Figure 3 Different, other structures can refer to Figure 3 The description is not repeated here.

[0109] In an exemplary embodiment, the substrate 401 may be a flexible substrate. For example, the flexible substrate may include a stacked first flexible material layer, a first inorganic material layer, a semiconductor layer, a second flexible material layer, and a second inorganic material layer. The first flexible material layer and the second flexible material layer may be made of polyimide (PI), polyethylene terephthalate (PET), or a surface-treated polymer soft film. The first inorganic material layer and the second inorganic material layer may be made of silicon nitride (SiNx) or silicon oxide (SiOx), etc., to improve the water and oxygen resistance of the substrate 401. The semiconductor layer may be made of amorphous silicon (a-Si).

[0110] In an exemplary embodiment, the light shielding portion 120 may be located on a side of the substrate 401 close to the first display panel. In other embodiments, the light shielding portion 120 may be located on a side of the substrate 401 away from the first display panel, which is not limited in this disclosure.

[0111] In an exemplary embodiment, the driving structure layer 22 may include a first transistor 101A and a second transistor 101B. The second transistor 101B may be located on a side of the first transistor 101A away from the substrate 401. The orthographic projection of the second transistor 101B on the substrate 401 may at least partially overlap with the orthographic projection of the first transistor 101A on the substrate 401, i.e., the first transistor 101A and the second transistor 101B may be stacked on the substrate 401. The second transistor 101B may be a driving transistor and may be connected to the anode of a corresponding light-emitting element. The first transistor 101A may be a switching transistor, and the first transistor 101A and the second transistor 101B may be connected via a connecting electrode 140. The second transistor 101B may have a dual-gate structure, where a bottom gate electrode may be provided on a side of the active layer of the second transistor 101B closer to the substrate 401, and a top gate electrode may be provided on a side of the active layer of the second transistor 101B away from the substrate 401. By configuring the first transistor 101A and the second transistor 101B as a stacked structure, the distance between the transistors can be reduced, making the layout of the pixel driving circuit more compact, thereby helping to improve the resolution of the first display panel.

[0112] In an exemplary embodiment, since the first transistor 101A and the second transistor 101B of the pixel driving circuit are stacked, the orthographic projection of the metal routing of the driving structure layer 21 on the substrate 401 can be arranged to at least partially overlap with the orthographic projection of the black matrix 301 of the second display panel on the substrate 401. By using an extreme process to avoid routing in the light-transmitting area, the light transmittance can be increased by approximately 1% to 2%, thereby improving the display effect of the second display panel.

[0113] In an exemplary embodiment, the first transistor 101A may be an oxide thin-film transistor, and the second transistor 101B may be a low-temperature polysilicon thin-film transistor. The active layer of the low-temperature polysilicon thin-film transistor is made of low-temperature polysilicon (LTPS), while the active layer of the oxide thin-film transistor is made of an oxide semiconductor (Oxide). Low-temperature polysilicon thin-film transistors have advantages such as high mobility and fast charging, while oxide thin-film transistors have advantages such as low leakage current. Integrating low-temperature polysilicon thin-film transistors and oxide thin-film transistors on a display panel to form a low-temperature polycrystalline oxide (LTPO) display panel can leverage the advantages of both, achieving low-frequency driving, reducing power consumption, and improving display quality.

[0114] In an exemplary embodiment, a first polarizing layer 118, a first touch layer 119, and a first protective layer 131 may be sequentially disposed on a side of the first color filter layer 117 away from the substrate 401. The first touch layer 119 and the first protective layer 131 may be connected by a first adhesive layer 130, and the first protective layer 131 may be a cover glass.

[0115] In an exemplary embodiment, the substrate 401 includes a plurality of anti-transmittance holes on a side adjacent to the second display panel. The anti-transmittance holes may be blind holes. The anti-transmittance holes can reduce the thickness of the substrate 401 and increase the light transmittance of the substrate 401. The number, shape, and distribution of the anti-transmittance holes can be set as needed and are not limited in this disclosure.

[0116] In an exemplary embodiment, in the preparation of Figure 7 In the process of forming the display panel shown, the light shielding portion 120, the first flattening layer 121, and the first display panel including the base 401 can be formed on the first base substrate. Subsequently, the first base substrate can be peeled off. After peeling off the first base substrate, multiple anti-reflection holes can be formed on the base 401. Subsequently, the array substrate for the second display panel can be formed on the base 401, and finally, the second display panel and the opposite substrate can be assembled into a cell package. No optical adhesive is required to bond the first and second display panels, resulting in a better integration of the display panels.

[0117] Figure 8 FIG. 1 is a schematic cross-sectional view of a display panel in another exemplary embodiment, illustrating the structure of two sub-pixels. Figure 8 and Figure 6 The difference is Figure 8 The light emitting devices in the embodiment can be used as the backlight source of the second display panel. Other structures can refer to the embodiment of the present invention. Figure 6 The description is not repeated here.

[0118] In an exemplary embodiment, the light-emitting device of the first display panel may include, in a direction away from the substrate 400, an anode 111, an organic light-emitting layer 113, and a cathode 114. Light emitted by the light-emitting device may pass through the cathode 114 to provide display for the first display panel, or may pass through the anode 111 to provide backlight for the second display panel.

[0119] In an exemplary embodiment, a plurality of light shielding portions 120 may be provided on a side of the light emitting device close to the substrate 400. By providing the light shielding portions 120, ambient light from the second display panel side may be prevented from affecting the normal display of the first display panel, thereby improving the display effect. The light shielding portions 120 may be provided as needed.

[0120] In an exemplary embodiment, a light reflecting portion 123 may be provided on a side of the light shielding portion 120 close to the substrate 400 , and the number of the light reflecting portions 123 may be smaller than the number of the light shielding portions 120 , which is not limited in the present disclosure.

[0121] In an exemplary embodiment, a lens layer may be provided on a side of the reflective portion 123 close to the substrate 400 , and the lens layer includes a plurality of first lenses 122 , so that the light emitted by the second type light emitting device is more concentratedly emitted toward the second display panel.

[0122] The details of the specific structure can be referred to above. Figure 6 The description is not repeated here. Figure 8 The preparation process of the display panel can refer to the above Figure 6 The description is omitted here.

[0123] Figure 3 、 Figures 5 to 8 The structures included in the display panel shown in the figure can be combined with each other arbitrarily, and the present disclosure does not limit this.

[0124] The display panels provided by the embodiments of the present disclosure can display different screen contents on the first and second display panels, enabling dual-screen interaction and full-color display. By utilizing the light-emitting devices of the first display panel as the backlight source for the second display panel, the light output of the second display panel can be increased, saving the overall power consumption of the display panel. The brightness of the second display panel can be controlled by providing structures such as a light-shielding portion, a light-reflecting portion, and a lens layer, avoiding mutual interference of light between the first and second display panels and reducing the overall power consumption of the display panel, thus meeting the needs of different application scenarios.

[0125] The present disclosure also provides a display device comprising the display panel described in any of the above embodiments. The display device can be any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigation system, but the present disclosure is not limited thereto.

[0126] An embodiment of the present disclosure also provides a method for preparing a display panel, the method comprising: forming a first display panel and a second display panel on opposite sides of a substrate, respectively; in a direction away from the substrate, the first display panel comprises a plurality of light-emitting devices and a first color film layer arranged in sequence, and the second display panel comprises an array substrate and an opposite substrate arranged in sequence, and a liquid crystal layer arranged between the array substrate and the opposite substrate; the first display panel is configured to perform display, and at least some of the plurality of light-emitting devices are configured to provide backlight to the second display panel so that the second display panel can perform display.

[0127] Although the embodiments disclosed herein are as described above, the contents described herein are merely embodiments for facilitating understanding of the present invention and are not intended to limit the present invention. Any person skilled in the art may make any modifications and variations in the form and details of the embodiments without departing from the spirit and scope of the present invention. However, the scope of patent protection of the present invention shall remain subject to the scope defined by the appended claims.

Claims

1. A display panel, characterized in that: include: a substrate, a first display panel and a second display panel disposed on opposite sides of the substrate; In a direction away from the substrate, the first display panel includes a plurality of light-emitting devices and a first color filter layer arranged in sequence, and the second display panel includes an array substrate and an opposite substrate arranged in sequence, and a liquid crystal layer arranged between the array substrate and the opposite substrate; the first display panel is configured to perform display, and at least some of the plurality of light-emitting devices are configured to provide backlight to the second display panel so that the second display panel can perform display; The plurality of light-emitting devices include a first type of light-emitting devices and a second type of light-emitting devices, the first type of light-emitting devices are configured to provide display for the first display panel, and the second type of light-emitting devices are configured to provide backlight for the second display panel; The opposite substrate comprises a black matrix, and an orthographic projection of the black matrix on the base at least partially overlaps with an orthographic projection of the light emitting device on the base; In a direction perpendicular to the display panel, the black matrix is ​​arranged corresponding to the first type of light-emitting devices and the second type of light-emitting devices of the first display panel, so as to prevent the light emitted by the first display panel from affecting the display of the second display panel when both the first display panel and the second display panel are displaying.

2. The display panel according to claim 1, wherein: In a direction away from the substrate, the first type of light emitting device includes a first anode, a first organic light emitting layer and a first cathode arranged in sequence, and the second type of light emitting device includes a second anode, a second organic light emitting layer and a second cathode arranged in sequence.

3. The display panel according to claim 2, wherein: The thickness of the first anode is set to be greater than the thickness of the second anode; the thickness of the first anode is the distance between the surface of the first anode close to the substrate and the surface away from the substrate, and the thickness of the second anode is the distance between the surface of the second anode close to the substrate and the surface away from the substrate.

4. The display panel according to claim 2, wherein: The thickness of the second cathode is set to be greater than the thickness of the first cathode; the thickness of the second cathode is the distance between the surface of the second cathode close to the substrate and the surface away from the substrate, and the thickness of the first cathode is the distance between the surface of the first cathode close to the substrate and the surface away from the substrate.

5. The display panel according to claim 2, wherein: The first display panel further includes a plurality of light shielding portions arranged on a side of the light emitting device close to the substrate, wherein the orthographic projections of the light shielding portions on the substrate at least partially overlap with the orthographic projections of the first type of light emitting device on the substrate.

6. The display panel according to claim 2, wherein: The first display panel further includes a lens layer disposed on a side of the light emitting device close to the substrate. The lens layer includes a plurality of first lenses configured to focus light emitted by the second type of light emitting device toward a center direction of the first lens.

7. The display panel according to claim 2, wherein: The first display panel further includes a driving structure layer provided on a side of the light emitting device close to the substrate, the driving structure layer including a pixel driving circuit; The pixel driving circuit includes a first transistor and a second transistor, the second transistor is located on a side of the first transistor away from the substrate, and the orthographic projection of the second transistor on the substrate at least partially overlaps with the orthographic projection of the first transistor on the substrate; the second transistor is connected to the anode of the light-emitting device, and the first transistor and the second transistor are connected.

8. The display panel according to claim 7, wherein: The active layer material of the first transistor is polysilicon, and the active layer material of the second transistor is oxide semiconductor.

9. The display panel according to claim 1, wherein: The opposite substrate includes the black matrix and the second color filter layer which are sequentially arranged facing the base.

10. The display panel according to claim 9, wherein: The display panel also includes a plurality of reflective portions arranged on a side of the substrate close to the light-emitting device, the reflective portions being configured to reflect ambient light from a side of the second display panel; the orthographic projection of the reflective portions on the substrate at least partially overlaps with the orthographic projection of the black matrix on the substrate.

11. The display panel according to claim 1, wherein The substrate is a flexible substrate, and a surface of the substrate close to the second display panel includes a plurality of anti-transmission holes.

12. The display panel according to claim 1, wherein The material of the substrate is optical adhesive.

13. The display panel according to claim 1, wherein: The light emitting device is a white organic light emitting diode or a white light diode.

14. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 13.

15. A method for preparing a display panel, characterized in that: The method includes: forming a first display panel and a second display panel on opposite sides of a substrate, respectively; in a direction away from the substrate, the first display panel includes a plurality of light-emitting devices and a first color filter layer arranged in sequence, and the second display panel includes an array substrate and an opposite substrate arranged in sequence, and a liquid crystal layer arranged between the array substrate and the opposite substrate; the first display panel is configured to perform display, and at least some of the plurality of light-emitting devices are configured to provide backlight to the second display panel, so that the second display panel performs display; The plurality of light-emitting devices include a first type of light-emitting devices and a second type of light-emitting devices, the first type of light-emitting devices are configured to provide display for the first display panel, and the second type of light-emitting devices are configured to provide backlight for the second display panel; The opposite substrate comprises a black matrix, and an orthographic projection of the black matrix on the base at least partially overlaps with an orthographic projection of the light emitting device on the base; In a direction perpendicular to the display panel, the black matrix is ​​arranged corresponding to the first type of light-emitting devices and the second type of light-emitting devices of the first display panel, so as to prevent the light emitted by the first display panel from affecting the display of the second display panel when both the first display panel and the second display panel are displaying.

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