Display panel and display device

Abstract

The display panel and the display device are disclosed to improve display efficiency. The display panel provided by the embodiment of the present disclosure comprises a display substrate comprising a substrate, at least one reflection layer; a light modulation structure comprising a phase difference film and an orientation structure; the orientation structure comprises a multilayer orientation film; the refractive index of the multilayer orientation film in a first polarization direction is the same, and the refractive index of any two adjacent orientation films in a second polarization direction is different; the orientation structure is used for transmitting linearly polarized light in the first polarization direction and reflecting linearly polarized light in the second polarization direction; the phase difference film is used for: converting between one of linearly polarized light in the first polarization direction and linearly polarized light in the second polarization direction and left-handed circularly polarized light, and converting between the other of linearly polarized light in the first polarization direction and linearly polarized light in the second polarization direction and right-handed circularly polarized light; and the light modulation structure is used for converting circularly polarized light reflected by the reflection layer into linearly polarized light in the second polarization direction and emitting.

Description

TECHNICAL FIELD

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

[0002] A mirror display screen is a screen that can be used as a mirror when the screen is off and can display normally when the screen is on. The mirror display screen can be applied to scenarios such as a makeup mirror, an advertising screen, and a rearview mirror of a vehicle. For an organic light-emitting diode flexible display screen, when a cover plate of the display screen is a glass material, the display screen can be made into a hard screen with a fixed shape such as a curved surface or a flat surface. When the cover plate of the display screen is a flexible film, the display screen can be made into a flexible screen with a shape such as a curved surface, a fold, a roll, or a special shape. The application of the mirror display on the organic light-emitting diode flexible display screen has a broad prospect.

[0003] However, in the prior art, the organic light-emitting diode flexible screen usually needs to be provided with a polaroid to realize mirror display, which causes more than 50% of light to be absorbed and affects the display efficiency. SUMMARY

[0004] Embodiments of the present disclosure provide a display panel and a display device to improve display efficiency.

[0005] The display panel provided by the embodiments of the present disclosure includes:

[0006] The display substrate includes a substrate and at least one reflection layer on one side of the substrate.

[0007] The light modulation structure is located on one side of the display substrate. The light modulation structure includes a phase difference film located on the side of the reflection layer away from the substrate and an orientation structure located on the side of the phase difference film away from the display substrate. The orientation structure includes a plurality of orientation films. The refractive index of the plurality of orientation films in a first polarization direction is the same, and the refractive index of any two adjacent orientation films in a second polarization direction is different. The orientation structure is configured to transmit linearly polarized light in the first polarization direction and reflect linearly polarized light in the second polarization direction. The phase difference film is configured to convert one of the linearly polarized light in the first polarization direction and the linearly polarized light in the second polarization direction and the left circularly polarized light, and convert the other of the linearly polarized light in the first polarization direction and the linearly polarized light in the second polarization direction and the right circularly polarized light. The light modulation structure is configured to convert the circularly polarized light reflected by the reflection layer into linearly polarized light in the second polarization direction and emit the linearly polarized light.

[0008] In some embodiments, the plurality of orientation films includes a plurality of first orientation films and a plurality of second orientation films, and the first orientation films and the second orientation films are arranged alternately in a direction perpendicular to the substrate.

[0009] The refractive index of the first orientation film in the second polarization direction is less than the refractive index of the second orientation film in the second polarization direction.

[0010] In some embodiments, in a multilayer alignment film, the alignment film closest to the retardation film is the first alignment film, and the alignment film furthest from the retardation film is the second alignment film.

[0011] In some embodiments, the second orientation film is a birefringence film, wherein the refractive index of the second orientation film in the first polarization direction is less than the refractive index of the second orientation film in the second polarization direction.

[0012] In some embodiments, the refractive index of the first orientation film in the first polarization direction is equal to the refractive index of the first orientation film in the second polarization direction.

[0013] In some embodiments, the reflective layer includes a first reflective layer;

[0014] The display substrate also includes:

[0015] Multiple light-emitting devices are located between the substrate and the light modulation structure; the light-emitting devices include: an anode, a light-emitting functional layer, and a cathode stacked together; the anode is reused as the first reflective layer.

[0016] In some embodiments, the reflective layer further includes at least one second reflective layer;

[0017] The display substrate also includes: a pixel definition layer, and an encapsulation layer located on the side of the multiple light-emitting devices facing away from the substrate.

[0018] The pixel definition layer includes multiple first opening regions, and the anode, the light-emitting functional layer, and the cathode are stacked in the first opening regions;

[0019] The second reflective layer is located on the side of the encapsulation layer away from the substrate. The second reflective layer includes a plurality of second opening regions, and the orthographic projection of the first opening region onto the substrate falls within the orthographic projection of the second opening region onto the substrate.

[0020] In some embodiments, the second reflective layer is disposed in contact with the encapsulation layer.

[0021] In some embodiments, the display substrate further includes: a color filter layer and / or a touch layer located on the side of the encapsulation layer opposite to the substrate.

[0022] The second reflective layer is located on the side of the color filter layer away from the substrate and / or the second reflective layer is located on the side of the touch layer away from the substrate.

[0023] In some embodiments, the material of the second reflective layer is aluminum or silver.

[0024] In some embodiments, the thickness of the second reflective layer is greater than or equal to 900 angstroms and less than or equal to 1100 angstroms.

[0025] In some embodiments, the thickness of the alignment film is greater than or equal to 40 micrometers and less than or equal to 70 micrometers.

[0026] In some embodiments, the phase retardation film is a quarter wave plate.

[0027] In some embodiments, the thickness of the retardation film is greater than or equal to 3 micrometers and less than or equal to 20 micrometers.

[0028] This disclosure provides a display device, including a display panel provided in this disclosure.

[0029] The display panel and display device provided in this disclosure embodiment have a light modulation structure disposed on one side of the display substrate. The alignment structure in the light modulation structure includes a multilayer alignment film. The multilayer alignment film transmits linearly polarized light in a first polarization direction and reflects linearly polarized light in a second polarization direction. When ambient light is incident on the light modulation structure, the linearly polarized light in the second polarization direction is reflected, while the linearly polarized light in the first polarization direction is transmitted. After passing through a phase retardation film, a reflective layer, and another phase retardation film, it becomes linearly polarized light in the second polarization direction, which is reflected by the multilayer alignment film. After passing through the phase retardation film, a reflective layer, and another phase retardation film, it becomes linearly polarized light in the first polarization direction and can exit from the multilayer alignment film. That is, the light modulation structure and the reflective layer can reflect ambient light, so that the display panel can achieve a mirror display effect in the dark. Therefore, the display panel provided in this disclosure embodiment does not require a reflective film and a circular polarizer, and can improve the light transmittance of the display panel while achieving a mirror display, thereby improving the display efficiency. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a display panel provided in an embodiment of the present disclosure;

[0032] Figure 2 A schematic diagram of the center alignment structure of a display panel provided in an embodiment of this disclosure;

[0033] Figure 3 A dark-state optical path diagram of a display panel provided in an embodiment of this disclosure;

[0034] Figure 4 A bright-state optical path diagram of a display panel provided in an embodiment of this disclosure;

[0035] Figure 5 This is a schematic diagram of another display panel structure provided in an embodiment of the present disclosure;

[0036] Figure 6 This is a schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0037] Figure 7 This is a schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0038] Figure 8 This is a schematic diagram of the structure of another display panel provided in an embodiment of the present disclosure;

[0039] Figure 9 This is a schematic diagram of the structure of a second reflective layer provided in an embodiment of the present disclosure. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Furthermore, the embodiments and features in the embodiments of this disclosure can be combined with each other without conflict. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0041] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that an element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0042] It should be noted that the dimensions and shapes of the figures in the accompanying drawings do not reflect actual scale and are intended only to illustrate the content of this disclosure. Furthermore, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0043] In related technologies, one method to achieve a mirror-like display in Organic Light-Emitting Diode (OLED) display panels involves depositing a mirror-like metal or inorganic film on top of the panel and then combining it with a polarizer. However, the transmittance and reflectance of the film formed by this method are negatively correlated; achieving a good mirror-like finish inevitably results in a loss of transmittance. Furthermore, the polarizer also causes more than 50% of the light to be absorbed, leading to low luminous efficiency. This necessitates increasing the brightness of the light-emitting devices to maintain display quality, increasing power consumption and shortening the lifespan of the devices. Therefore, the methods used to achieve mirror-like displays in OLED panels significantly reduce display efficiency.

[0044] This disclosure provides a display panel, such as... Figure 1 As shown, the display panel includes:

[0045] The display substrate 1 includes a substrate 101 and at least one reflective layer 102 located on one side of the substrate 101.

[0046] An optical modulation structure 2 is located on one side of the display substrate 1. The optical modulation structure 2 includes: a retardation film 201 located on the side of the reflective layer 102 facing away from the substrate 101, and an alignment structure 202 located on the side of the retardation film 201 facing away from the display substrate 1. The alignment structure 202 includes multiple alignment films 2021. The multiple alignment films 2021 have the same refractive index in the first polarization direction, and any two adjacent alignment films 2021 have different refractive indices in the second polarization direction. Figure 2 As shown, the orientation structure 202 is used to transmit linearly polarized light p1 with a first polarization direction P1 and reflect linearly polarized light p2 with a second polarization direction P2; as Figure 3 As shown, the phase difference film 201 is used to: convert one of the linearly polarized light p1 in the first polarization direction P1 and the linearly polarized light p2 in the second polarization direction P2 into left-handed circularly polarized light p3-, and convert the other of the linearly polarized light p1 in the first polarization direction P1 and the linearly polarized light p2 in the second polarization direction P2 into right-handed circularly polarized light p3+; the light modulation structure 2 is used to: convert the circularly polarized light p3 reflected by the reflective layer 102 into linearly polarized light p2 in the second polarization direction P2 for emission.

[0047] It should be noted that when the phase retardation film converts linearly polarized light p2 with the second polarization direction P2 to left-handed circularly polarized light p3-, and converts linearly polarized light p1 with the first polarization direction P1 to right-handed circularly polarized light p3+, the linearly polarized light p1 with the first polarization direction P1 emitted from the alignment structure towards the display substrate is converted into right-handed circularly polarized light p3+ after passing through the phase retardation film and emitted towards the reflective layer. The right-handed circularly polarized light p3+ is reflected by the reflective layer and becomes left-handed circularly polarized light p3-. After passing through the phase retardation film, the circularly polarized light p3- is converted into linearly polarized light p2 with a second polarization direction P2 and emitted towards the orientation structure. The linearly polarized light p2 with the second polarization direction P2 is reflected by the orientation structure and, after passing through the phase retardation film again, is converted into left-handed circularly polarized light p3- and emitted towards the reflective layer. After being reflected by the reflective layer, the left-handed circularly polarized light p3- becomes right-handed circularly polarized light p3+. The right-handed circularly polarized light p3+ is converted into linearly polarized light p1 with a first polarization direction P1 and emitted towards the orientation structure after passing through the phase retardation film. When the phase retardation film converts linearly polarized light p2 in the second polarization direction P2 to right-hand circularly polarized light p3+, and converts linearly polarized light p1 in the first polarization direction P1 to left-hand circularly polarized light p3-, the linearly polarized light p1 in the first polarization direction P1 is converted into left-hand circularly polarized light p3- after passing through the phase retardation film. The left-hand circularly polarized light p3- is reflected by the reflective layer and becomes right-hand circularly polarized light p3+. The right-hand circularly polarized light p3+ is converted into linearly polarized light p2 in the second polarization direction P2 after passing through the phase retardation film. The linearly polarized light p2 in the second polarization direction P2 is reflected by the alignment structure and converted into right-hand circularly polarized light p3+ after passing through the phase retardation film again. The right-hand circularly polarized light p3+ is reflected by the reflective layer and becomes left-hand circularly polarized light p3-. After passing through the phase retardation film again, it is converted into linearly polarized light p1 in the first polarization direction P1 and emitted from the side of the alignment structure away from the display substrate.

[0048] The display panel provided in this embodiment has a light modulation structure on one side of the display substrate. The alignment structure in the light modulation structure includes a multilayer alignment film. The multilayer alignment film transmits linearly polarized light in a first polarization direction and reflects linearly polarized light in a second polarization direction. When ambient light is incident on the light modulation structure, the linearly polarized light in the second polarization direction is reflected, while the linearly polarized light in the first polarization direction is transmitted. After passing through a phase retardation film, a reflective layer, and another phase retardation film, it becomes linearly polarized light in the second polarization direction, which is reflected by the multilayer alignment film. After passing through the phase retardation film, a reflective layer, and another phase retardation film, it becomes linearly polarized light in the first polarization direction and can exit from the multilayer alignment film. That is, the light modulation structure and the reflective layer can reflect ambient light, enabling the display panel to achieve a mirror display effect in the dark. Therefore, the display panel provided in this embodiment does not require a reflective film and a circular polarizer, and can improve the light transmittance of the display panel while achieving a mirror display, thereby improving display efficiency.

[0049] It should be noted that, Figure 3This is a schematic diagram of the light path of ambient light passing through the light modulation structure and reflective layer when the display panel is in a dark state.

[0050] It should be noted that, in the first polarization direction P1 and the second polarization direction P2, one is the X direction of the XY polarization coordinate system, and the other is the Y direction of the XY polarization coordinate system. The phase difference film is used to: convert linearly polarized light in the X direction to left-hand circularly polarized light p3-, and to convert linearly polarized light in the Y direction to right-hand circularly polarized light p3+. The Z direction is the direction of light propagation, and the XY plane perpendicular to the Z direction serves as the polarization plane. Figure 2 , Figure 3 Taking a first polarization direction P1 as the Y direction and a second polarization direction P2 as the X direction as an example, the phase retardation film 201 is used to: convert linearly polarized light p2 in the second polarization direction P2 to left-handed circularly polarized light p3-, and convert linearly polarized light p1 in the first polarization direction P1 to right-handed circularly polarized light p3+. That is, the orientation structure reflects X-direction polarized light and transmits Y-direction polarized light. Specifically, as... Figure 3 As shown, the ambient light includes linearly polarized light p2 in the X direction (second polarization direction P2) and linearly polarized light p1 in the Y direction (first polarization direction P1). The linearly polarized light p2 in the X direction (second polarization direction P2) is reflected by the orientation structure 202. The linearly polarized light p1 in the Y direction (first polarization direction P1) exits from the orientation structure 202, passes through the phase difference film 201, and is converted into right-handed circularly polarized light p3+. The right-handed circularly polarized light p3+ is then reflected by the reflective layer 102 and becomes left-handed circularly polarized light p3-. After passing through the phase retardation film 201, the circularly polarized light p3- is converted into linearly polarized light p2 in the X direction, i.e., the second polarization direction P2. The linearly polarized light p2 in the X direction, i.e., the second polarization direction P2, is reflected by the alignment structure 202 and passes through the phase retardation film 201 again, converting into left-hand circularly polarized light p3-. After being reflected by the reflective layer 102, the left-hand circularly polarized light p3- becomes right-hand circularly polarized light p3+. After passing through the phase retardation film 201 again, it is converted into linearly polarized light p1 in the Y direction, i.e., the first polarization direction P1, and is emitted from the side of the alignment structure 202 away from the display substrate.

[0051] Of course, in specific implementations, when it is necessary to set the orientation structure to transmit polarized light in the X direction and reflect polarized light in the Y direction, then the first polarization direction P1 is the Y direction and the second polarization direction P2 is the X direction. The phase difference film is used to: convert between linearly polarized light p2 in the second polarization direction P2 and left-handed circularly polarized light p3-, and to convert between linearly polarized light p1 in the first polarization direction P1 and right-handed circularly polarized light p3+.

[0052] In some embodiments, such as Figure 2As shown, the multilayer alignment film 2021 includes: a multilayer first alignment film 20211 and a multilayer second alignment film 20212, in a direction perpendicular to the substrate (not shown) (i.e. Figure 2 The first alignment film 20211 and the second alignment film 20212 are alternately arranged on the Z-direction; that is, on the side of the phase difference film (not shown) away from the display substrate (not shown), the first alignment film 20211 and the second alignment film 20212 are alternately stacked to form an alignment structure 202.

[0053] The refractive index of the first orientation film 20211 in the second polarization direction P2 is less than the refractive index of the second orientation film 20212 in the second polarization direction P2.

[0054] The display panel provided in this embodiment has a first alignment film with a refractive index less than that of the second alignment film in the second polarization direction. As a result, when linearly polarized light in the second polarization direction propagates from the second alignment film to the first alignment film and the incident angle is greater than the total internal reflection angle, the linearly polarized light in the second polarization direction can undergo total internal reflection at the interface between the first and second alignment films. This is more conducive to improving the reflectivity of the linearly polarized light in the second polarization direction and improving the specular reflection effect.

[0055] In some embodiments, such as Figure 2 As shown, in the multilayer alignment film 2021, the alignment film 2021 closest to the retardation film (not shown) is the first alignment film 20211, and the alignment film 2021 furthest from the retardation film is the second alignment film 20212. This is more conducive to improving the reflectivity of linearly polarized light in the second polarization direction in ambient light under dark conditions, and improving the specular reflection effect.

[0056] In some embodiments, the second orientation film is a birefringence film, wherein the refractive index of the second orientation film in the first polarization direction is less than the refractive index of the second orientation film in the second polarization direction.

[0057] In some embodiments, the refractive index of the first orientation film in the first polarization direction is equal to the refractive index of the first orientation film in the second polarization direction.

[0058] That is, the first orientation film does not have to be a birefringence film. In the display panel provided in this disclosure, the second orientation film is a birefringence film and the first orientation film is not a birefringence film. While ensuring that the refractive index of the first orientation film in the second polarization direction is less than that of the second orientation film in the second polarization direction, it is beneficial to simplify the design difficulty of the second orientation film and the first orientation film.

[0059] In some embodiments, the refractive index of the second orientation film in the first polarization direction, the refractive index of the first orientation film in the first polarization direction, the refractive index of the first orientation film in the second polarization direction are 1.57, and the refractive index of the second orientation film in the second polarization direction is 1.84.

[0060] Of course, in some embodiments, the first orientation film may also be a birefringence film, wherein the refractive index of the first orientation film in the first polarization direction is less than the refractive index of the first orientation film in the second polarization direction.

[0061] In some embodiments, the orientation film is an organic film. An organic film is, for example, a polyester film.

[0062] It should be noted that the reflectivity of the alignment structure to ambient light and the mirror-like display effect of the display panel in the dark are positively correlated with the number of alignment films in the alignment structure. That is, the more alignment films there are, the higher the reflectivity of the alignment structure and the better the mirror-like display effect of the display panel in the dark. In some embodiments, the alignment structure includes hundreds of alignment films. To further improve the mirror-like display effect of the display panel in the dark, the alignment structure includes thousands of alignment films.

[0063] In some embodiments, the thickness of the alignment film is greater than or equal to 40 micrometers and less than or equal to 70 micrometers. For example, the thickness of the alignment film is 60 micrometers.

[0064] In some embodiments, the phase retardation film is a quarter wave plate.

[0065] In some embodiments, the thickness of the retardation film is greater than or equal to 30 micrometers and less than or equal to 20 micrometers.

[0066] For example, the thickness of the phase retardation film is 7 micrometers.

[0067] In some embodiments, such as Figure 1 As shown, the display panel also includes: a first adhesive layer 3 located between the multilayer alignment film 202 and the retardation film 201, and a second adhesive layer 4 located between the retardation film 201 and the display substrate 1. That is, the alignment structure and the retardation film can be fabricated independently and then bonded together by the first adhesive layer to form a light modulation structure, and the light modulation structure is then bonded to the display substrate by the second adhesive layer.

[0068] In some embodiments, the first adhesive layer and the second adhesive layer are pressure-sensitive adhesives.

[0069] In some embodiments, the thickness of the first adhesive layer and the second adhesive layer is 15 micrometers.

[0070] In some embodiments, such as Figure 1 As shown, the display substrate 1 also includes:

[0071] Multiple light-emitting devices 103 are located between the substrate 101 and the light modulation structure 2; each light-emitting device 103 includes an anode 1031, a light-emitting functional layer 1032, and a cathode 1033 stacked together.

[0072] In some embodiments, the anode is a reflective anode. For example...Figure 1 As shown, the reflective layer 102 includes a first reflective layer 1021, and the anode 1031 is reused as the first reflective layer 1021.

[0073] It should be noted that the dark state of the display panel is the state in which the light-emitting devices are not emitting light, and the bright state of the display panel is the state in which the light-emitting devices are emitting light. The optical path diagram of the light emitted by the light-emitting devices through the light modulation structure in the bright state of the display panel is shown below. Figure 4 As shown, the light emitted by the light-emitting device 103 includes linearly polarized light p2 in the X direction (i.e., the second polarization direction P2) and linearly polarized light p1 in the Y direction (i.e., the first polarization direction P1). Furthermore, after passing through the phase difference film 201, the light emitted by the light-emitting device 103 still includes linearly polarized light p2 in the X direction (i.e., the second polarization direction P2) and linearly polarized light p1 in the Y direction (i.e., the first polarization direction P1). In the light emitted by the light-emitting device 103 and emitted from the phase retardation film 201 toward the alignment structure 202, linearly polarized light p1 in the Y direction (i.e., the first polarization direction P1) is emitted from the alignment structure 202, and linearly polarized light p2 in the X direction (i.e., the second polarization direction P2) is reflected by the alignment structure 202 and reaches the phase retardation film 201 again. This linearly polarized light p2 in the X direction (i.e., the second polarization direction P2) is converted into left-handed circularly polarized light p3- after passing through the phase retardation film 201. After being reflected by the reflective layer 102, the left-handed circularly polarized light p3- becomes right-handed circularly polarized light p3+, which passes through the phase retardation film 201 again and is converted into linearly polarized light p1 in the Y direction (i.e., the first polarization direction P1) and emitted from the side of the alignment structure 202 away from the display substrate. Thus, both the linearly polarized light p2 in the X direction (i.e., the second polarization direction P2) and the linearly polarized light p1 in the Y direction (i.e., the first polarization direction P1) of the light-emitting device 103 can be emitted through the light modulation structure 2.

[0074] Compared to display panels using circular polarizers in related technologies, the display panel provided in this disclosure utilizes a light modulation structure and a reflective layer to achieve mirror-like display in the dark state while simultaneously increasing the transmittance of light emitted by the light-emitting device in the bright state. This improves the display efficiency in the bright state without increasing power consumption to enhance the brightness of the light-emitting device, thus extending its lifespan. Compared to structures using circular polarizers and reflective films, the light modulation structure in the display panel provided in this disclosure can improve luminous efficacy by at least 35%.

[0075] In some embodiments, the light-emitting functional layer includes an organic light-emitting layer, and may also include an electron injection layer, an electron transport layer, a hole transport layer, a hole injection layer, etc.

[0076] In some embodiments, the display panel includes a plurality of sub-pixels; each light-emitting device corresponds to one sub-pixel.

[0077] In some embodiments, the plurality of sub-pixels includes: a plurality of first sub-pixels, a plurality of second sub-pixels, and a plurality of third sub-pixels;

[0078] The multiple light-emitting devices include: multiple first light-emitting devices, multiple second light-emitting devices, and multiple third light-emitting devices; the light-emitting functional layer of the first light-emitting device includes a first organic light-emitting layer, the light-emitting functional layer of the second light-emitting device includes a second organic light-emitting layer, and the light-emitting functional layer of the third light-emitting device includes a third organic light-emitting layer.

[0079] In some embodiments, the first sub-pixel is a blue sub-pixel, the first light-emitting device is a blue light-emitting device, and the first organic light-emitting layer is a blue organic light-emitting layer; the second sub-pixel is a green sub-pixel, the second light-emitting device is a green light-emitting device, and the second organic light-emitting layer is a green organic light-emitting layer; the third sub-pixel is a red sub-pixel, the third light-emitting device is a red light-emitting device, and the third organic light-emitting layer is a red organic light-emitting layer.

[0080] In some embodiments, such as Figure 1 As shown, the display substrate 1 further includes: a first buffer layer 108 located between the anode 1031 and the substrate 101, a driving circuit layer 112 located between the first buffer layer 108 and the anode 1031, and a first planarization layer 111 located between the driving circuit layer 112 and the anode 1031.

[0081] In some embodiments, the driving circuit layer includes a plurality of pixel driving circuits arranged in an array; the pixel driving circuits are used to drive the light-emitting device to emit light; the pixel driving circuits include thin-film transistors and storage capacitors; such as Figure 1 As shown, the thin-film transistor (TFT) includes: an active layer 1121, a gate G, a source S, and a drain D;

[0082] The display substrate 1 further includes: a first gate insulating layer 109 located between the active layer 1121 and the gate G; an interlayer insulating layer 110 located between the first gate insulating layer 109 and the source S and drain D; and a first planarization layer 111 located between the light-emitting device 103 and the source S and drain D. The anode 1031 is connected to the drain D through a via penetrating the first planarization layer 111.

[0083] In some embodiments, such as Figure 1 As shown, the display substrate 1 also includes: a pixel definition layer 104, and an encapsulation layer 107 located on the side of the plurality of light-emitting devices 103 facing away from the substrate 101;

[0084] The pixel definition layer 104 includes a plurality of first opening regions 1041, and an anode 1031, a light-emitting functional layer 1032, and a cathode 1033 are stacked in the first opening regions 1041.

[0085] In some embodiments, such as Figure 1As shown, the pixel definition layer 104 covers the edge of the anode 1031, that is, the pixel definition layer 104 is located on the side of the anode 1031 away from the substrate 101, and the light-emitting functional layer 1032 is located on the side of the pixel definition layer 104 away from the substrate 101.

[0086] It should be noted that the active layer can be fabricated using amorphous silicon, polycrystalline silicon, oxide semiconductor materials, etc. The active layer includes a source region, a drain region, and a channel region located between the source and drain regions. The source and drain regions can be conductive regions formed by doping with n-type or p-type impurities. The source regions overlap with each other, and the drain regions overlap with each other.

[0087] In some embodiments, the display substrate further includes multiple scan lines and multiple data lines, wherein the scan lines are electrically connected to the gate and the data lines are electrically connected to the source.

[0088] It should be noted that, Figure 1 The following example uses a thin-film transistor (TFT) with a top-gate structure, where the gate G is located on the side of the active layer 1121 facing away from the substrate 101. Of course, the TFT can also have a bottom-gate or other structures. If the TFT has a bottom-gate structure, the active layer is located on the side of the gate facing away from the substrate. Similarly, a first gate insulating layer is also included between the gate and the active layer, and the source and drain are in direct contact with the active layer on the side of the active layer facing away from the substrate.

[0089] In some embodiments, the storage capacitor includes a first capacitor electrode and a second capacitor electrode disposed opposite to each other. For example, the first capacitor electrode is disposed in the same layer as the gate, and the second capacitor electrode is disposed in the same layer as the source and drain. Alternatively, the second capacitor electrode may be disposed in the same layer as the source and drain, and the first capacitor electrode may be located between the interlayer insulating layer and the gate; the display panel further includes a second gate insulating layer located between the first capacitor electrode and the gate.

[0090] In some embodiments, such as Figure 1 As shown, the encapsulation layer 107 includes: a first inorganic encapsulation film 1071, an organic encapsulation film 1072, and a second inorganic encapsulation film 1073 stacked together.

[0091] In some embodiments, such as Figures 5-9 As shown, the reflective layer 102 further includes at least one second reflective layer 1022;

[0092] The second reflective layer 1022 is located on the side of the encapsulation layer 107 away from the substrate 101. The second reflective layer 1022 includes a plurality of second opening regions 10221. The orthographic projection of the first opening region 1041 onto the substrate 101 falls within the orthographic projection of the second opening region 10221 onto the substrate 101.

[0093] It should be noted that when the anode is reused as a reflective layer, the reflective effect in the dark state is weak due to its position and thickness. The display panel provided in this disclosure adds at least one second reflective layer to the side of the encapsulation layer facing away from the substrate, which can improve the reflective effect, thereby improving the reflective effect in the dark state of the display panel and thus improving the mirror display effect. Furthermore, the second reflective layer includes multiple second opening areas, and the orthographic projection of the first opening area onto the substrate falls within the orthographic projection of the second opening area onto the substrate, meaning the second reflective layer will not block the light-emitting area of ​​the light-emitting device.

[0094] It should be noted that, Figure 9 The pattern is the orthographic projection of the second reflective layer 1022, which includes multiple second opening regions 10221, onto the substrate.

[0095] In some embodiments, such as Figure 9 As shown, the areas of the multiple second opening regions 10221 are not exactly the same.

[0096] It should be noted that different colored emissive layers have different luminous efficiencies, therefore the area of ​​the first opening region corresponding to different colored sub-pixels is different, which can improve the uniformity of light efficiency of different colored sub-pixels. Correspondingly, the area of ​​the second opening region corresponding to different colored sub-pixels is also different.

[0097] In some embodiments, such as Figure 5 As shown, the second reflective layer 1022 is in contact with the encapsulation layer 107. That is, the second reflective layer 1022 is in contact with the second inorganic encapsulation film 1073.

[0098] In some embodiments, such as Figures 5-8 As shown, the display substrate 1 further includes: a first protective layer 113; the first protective layer 113 is located on the side of the second inorganic encapsulation film 1073 that is away from the substrate 101.

[0099] In some embodiments, such as Figures 5-8 As shown, the film layer closest to the light modulation structure 2 in the display substrate 1 is the second reflective layer 1022. That is, by setting the second reflective layer on the top layer of the display substrate, the reflection effect of ambient light can be further improved, and the dark-state mirror display effect can be further improved.

[0100] In some embodiments, such as Figure 5 As shown, the second reflective layer 1022 is located on the side of the first protective layer 113 that is away from the second inorganic encapsulation film 1073.

[0101] Alternatively, in some embodiments, the second reflective layer may also be disposed between the first protective layer and the second inorganic encapsulation film.

[0102] In some embodiments, such as Figures 6-8As shown, the display substrate 1 further includes: a color filter layer 105 and / or a touch layer 106 located on the side of the encapsulation layer 107 facing away from the substrate 101; wherein, Figure 6 The display substrate 1 includes a color filter layer 105 but does not include a touch layer 106; Figure 7 The display substrate 1 includes a touch layer 106 but does not include a color filter layer 105; Figure 8 The display substrate 1 includes a color filter layer 105 and a touch layer 106, with the touch layer 106 located on the side of the color filter layer 105 away from the base substrate 101.

[0103] The second reflective layer 1022 is located on the side of the color filter layer 105 away from the substrate 101 and / or the second reflective layer 1022 is located on the side of the touch layer 106 away from the substrate 101.

[0104] In some embodiments, such as Figure 6 , Figure 8 As shown, the color filter layer 105 includes a plurality of color filters 1051;

[0105] The display substrate 1 further includes: a light-shielding layer 114, the light-shielding layer 114 having a plurality of third opening regions 1141, the orthographic projection of the first opening region 1041 onto the substrate 101 falling into the orthographic projection of the third opening region 1141 onto the substrate 101; and a color filter 1051 located at least within the third opening region 1141.

[0106] In some embodiments, when the display panel includes a first sub-pixel, a second sub-pixel, and a third sub-pixel, the plurality of color filters include a first color filter corresponding to the first sub-pixel, a second color filter corresponding to the second sub-pixel, and a third color filter corresponding to the third sub-pixel.

[0107] In some embodiments, such as Figure 6 , Figure 8 As shown, the orthographic projection of the third opening region 1141 onto the substrate 101 falls within the orthographic projection of the second opening region 10221 onto the substrate 101; the color filter 1051 is located at least within the third opening region 1141.

[0108] In some embodiments, such as Figure 6 , Figure 8 As shown, the display substrate 1 further includes a second planarization layer 116 located on the side of the light-shielding layer 114 and the color filter layer 105 facing away from the substrate 101.

[0109] In some embodiments, such as Figure 6 As shown, the second planarization layer 116 is reused as the first protective layer 113, and the second reflective layer 1022 is located on the side of the first protective layer 113 facing away from the color filter 1051. That is, by setting the second reflective layer on the top layer of the display substrate, the reflection effect of ambient light can be further improved, and the dark-state mirror display effect can be further improved.

[0110] Alternatively, in some embodiments, the second reflective layer is located on the side of the second planarization layer away from the substrate, the second reflective layer is disposed in contact with the second planarization layer, and the first protective layer covers the second reflective layer disposed on the second planarization layer.

[0111] In some embodiments, such as Figure 7 , Figure 8 As shown, the touch layer 106 includes: a second buffer layer 1064, a first touch conductive layer 1061 located on the side of the second buffer layer 1064 away from the substrate 101, a second touch conductive layer 1062 located on the side of the first touch conductive layer 1061 away from the substrate 101, and a touch insulating layer 1063 located between the first touch conductive layer 1061 and the second touch conductive layer 1062.

[0112] In some embodiments, the touch layer includes a plurality of touch electrodes; the plurality of touch electrodes includes a plurality of first touch electrodes and a plurality of second touch electrodes intersecting with the plurality of first touch electrodes. For example, the first touch electrodes and the second touch electrodes are located in different touch conductive layers, that is, the first touch electrodes and the second touch electrodes are located in the first touch conductive layer and the second touch conductive layer, respectively. Alternatively, one of the first touch electrodes and the second touch electrodes is located in the same touch conductive layer, and the other touch electrode is located in a different touch conductive layer. The touch electrodes located in different touch conductive layers are electrically connected through vias penetrating the touch insulating layer, and the first touch electrodes and the second touch electrodes include portions located in the same touch conductive layer.

[0113] In some embodiments, the orthographic projections of the first touch conductive layer and the second touch conductive layer onto the substrate fall within the orthographic projection of the pixel definition layer onto the substrate. That is, the orthographic projections of the first touch conductive layer and the second touch conductive layer onto the substrate do not overlap with the orthographic projection of the first opening area onto the substrate, thereby preventing the touch layer from affecting the light transmittance of the light-emitting device.

[0114] In some embodiments, such as Figure 7 , Figure 8 As shown, the first protective layer 113 is located on the side of the second touch conductive layer 1062 that is away from the substrate 101, and the second reflective layer 1022 is located on the side of the first protective layer 113 that is away from the substrate 101. That is, by setting the second reflective layer on the top layer of the display substrate, the reflection effect of ambient light can be further improved, and the dark mirror display effect can be further improved.

[0115] Alternatively, in some embodiments, the touch layer may also include a touch protection layer located on the side of the second touch conductive layer away from the substrate, a second reflective layer located on the side of the touch protection layer away from the second touch conductive layer, and a first protective layer located on the side of the second reflective layer away from the second touch conductive layer.

[0116] It should be noted that, Figures 5-8 The following example illustrates the situation with the second reflective layer 1022 located on the top layer of the display substrate 1. In actual implementation, the second reflective layer can be placed in any position that does not affect other structures. Figures 5-8 Taking a display substrate including a second reflective layer as an example, the following explanation is provided. In specific implementations, the display substrate may include multiple second reflective layers. For example, when the display substrate includes a color filter layer, a second reflective layer may be provided between the encapsulation layer and the color filter layer, and on the side of the color filter layer facing away from the substrate. When the display substrate includes a touch layer, a second reflective layer may be provided between the encapsulation layer and the touch layer, and on the side of the touch layer facing away from the substrate. When the display substrate includes both a touch layer and a color filter layer, a second reflective layer may be provided in at least one of the following: between the encapsulation layer and the color filter layer, between the color filter layer and the touch layer, and on the side of the touch layer facing away from the substrate.

[0117] In some embodiments, the material of the second reflective layer is aluminum or silver.

[0118] In some embodiments, the thickness of the second reflective layer is greater than or equal to 900 angstroms and less than or equal to 1100 angstroms.

[0119] It should be noted that the reflective effect of the second reflective layer is positively correlated with its thickness. In the display panel provided in this disclosure, the thickness of the second reflective layer is greater than or equal to 900 angstroms and less than or equal to 1100 angstroms, which can ensure the reflective effect of the second reflective layer while avoiding excessively increasing the thickness of the display panel. For example, the thickness of the second reflective layer is 1000 angstroms.

[0120] Based on the same inventive concept, this disclosure also provides a display device, including the display panel provided in this disclosure.

[0121] The display device provided in this disclosure includes any product or component with a display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator. Other essential components of this display device are understood by those skilled in the art and will not be described in detail here, nor should they be construed as limiting this disclosure. Implementation of this display device can refer to the embodiments of the display panel described above; repeated details will not be repeated.

[0122] In summary, the display panel and display device provided in this disclosure embodiment have a light modulation structure disposed on one side of the display substrate. The alignment structure in the light modulation structure includes a multilayer alignment film. The multilayer alignment film transmits linearly polarized light in a first polarization direction and reflects linearly polarized light in a second polarization direction. When ambient light is incident on the light modulation structure, the linearly polarized light in the second polarization direction is reflected, while the linearly polarized light in the first polarization direction is transmitted. After passing through a phase retardation film, a reflective layer, and another phase retardation film, it becomes linearly polarized light in the second polarization direction, which is reflected by the multilayer alignment film. After passing through the phase retardation film, a reflective layer, and another phase retardation film, it becomes linearly polarized light in the first polarization direction and can exit from the multilayer alignment film. That is, the light modulation structure and the reflective layer can reflect ambient light, enabling the display panel to achieve a mirror display effect in the dark. Therefore, the display panel provided in this disclosure embodiment does not require a reflective film and a circular polarizer, and can improve the light transmittance of the display panel while achieving a mirror display, thereby improving display efficiency.

[0123] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0124] Obviously, those skilled in the art can make various modifications and variations to this disclosure without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims of this disclosure and their equivalents, this disclosure is also intended to include such modifications and variations.

Claims

1. A display panel, wherein, The display panel includes: The display substrate includes a substrate and at least one reflective layer located on one side of the substrate; A light modulation structure is located on one side of the display substrate. The light modulation structure includes: a phase retardation film located on the side of the reflective layer facing away from the substrate, and an alignment structure located on the side of the phase retardation film facing away from the display substrate. The alignment structure includes multiple alignment films. The multiple alignment films have the same refractive index in a first polarization direction, and any two adjacent alignment films have different refractive indices in a second polarization direction. The alignment structure is used to transmit linearly polarized light in the first polarization direction and reflect linearly polarized light in the second polarization direction. The phase retardation film is used to convert one of the linearly polarized light in the first polarization direction and the linearly polarized light in the second polarization direction into left-handed circularly polarized light, and to convert the other of the linearly polarized light in the first polarization direction and the linearly polarized light in the second polarization direction into right-handed circularly polarized light. The light modulation structure is used to convert the circularly polarized light reflected by the reflective layer into linearly polarized light in the second polarization direction for emission.

2. The display panel according to claim 1, wherein, The multilayer alignment film includes: a multilayer first alignment film and a multilayer second alignment film, wherein the first alignment film and the second alignment film are alternately arranged in a direction perpendicular to the substrate. The refractive index of the first orientation film in the second polarization direction is less than that of the second orientation film in the second polarization direction.

3. The display panel according to claim 2, wherein, In the multilayer alignment film, the alignment film closest to the phase difference film is the first alignment film, and the alignment film furthest from the phase difference film is the second alignment film.

4. The display panel according to claim 2 or 3, wherein, The second orientation film is a birefringence film, and the refractive index of the second orientation film in the first polarization direction is less than the refractive index of the second orientation film in the second polarization direction.

5. The display panel according to claim 4, wherein, The refractive index of the first orientation film in the first polarization direction is equal to the refractive index of the first orientation film in the second polarization direction.

6. The display panel according to any one of claims 1 to 3 and 5, wherein, The reflective layer includes a first reflective layer; The display substrate further includes: Multiple light-emitting devices are located between the substrate and the light modulation structure; each light-emitting device includes: an anode, a light-emitting functional layer, and a cathode stacked together; the anode is reused as the first reflective layer.

7. The display panel according to claim 6, wherein, The reflective layer further includes: at least one second reflective layer; The display substrate further includes: a pixel definition layer, and an encapsulation layer located on the side of the plurality of light-emitting devices facing away from the substrate. The pixel definition layer includes multiple first opening regions, and the anode, the light-emitting functional layer, and the cathode are stacked in the first opening regions; The second reflective layer is located on the side of the encapsulation layer opposite to the substrate. The second reflective layer includes a plurality of second opening regions, and the orthographic projection of the first opening region on the substrate falls within the orthographic projection of the second opening region on the substrate.

8. The display panel according to claim 7, wherein, The second reflective layer is disposed in contact with the encapsulation layer.

9. The display panel according to claim 7 or 8, wherein, The display substrate further includes: a color filter layer and / or a touch layer located on the side of the encapsulation layer opposite to the substrate; The second reflective layer is located on the side of the color filter layer opposite to the substrate and / or the second reflective layer is located on the side of the touch layer opposite to the substrate.

10. The display panel according to claim 7, wherein, The material of the second reflective layer is aluminum or silver.

11. The display panel according to claim 10, wherein, The thickness of the second reflective layer is greater than or equal to 900 angstroms and less than or equal to 1100 angstroms.

12. The display panel according to any one of claims 1 to 3, 5, 7, 8, 10, and 11, wherein, The thickness of the orientation film is greater than or equal to 40 micrometers and less than or equal to 70 micrometers.

13. The display panel according to any one of claims 1 to 3, 5, 7, 8, 10, and 11, wherein, The phase difference film is a quarter wave plate.

14. The display panel according to any one of claims 1 to 3, 5, 7, 8, 10, and 11, wherein, The thickness of the phase retardation film is greater than or equal to 3 micrometers and less than or equal to 20 micrometers.

15. A display device, wherein, Includes the display panel according to any one of claims 1 to 14.

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