CN115884641A - Display substrate and display panel - Google Patents

Abstract

The present disclosure provides a display substrate and a display panel, the display substrate including a substrate and a display functional layer and an omni-directional mirror on the substrate. The display function layer includes a pixel definition layer including a plurality of first openings to define light emitting devices, and a plurality of light emitting devices. The omnidirectional reflector is positioned on the light-emitting side of the display functional layer and comprises a plurality of second openings, and orthographic projections of the second openings on the substrate are at least partially overlapped with orthographic projections of the first openings on the substrate. In the design, the application of the omnidirectional reflector can avoid the generation of color mixing, and can not cause adverse effect on the luminous performance of the light-emitting device.

Description

Display substrate and display panel

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a display substrate and a display panel including the same.

Background

With the progress of social science and technology, electronic display products are widely applied in daily work and life and have wide development prospects. Electronic display products are generally designed to have a larger viewing angle and resolution to ensure a better display effect, but the design may cause light leakage from a pixel to an adjacent pixel, which may cause color mixing and display defects.

Some shielding structures can be designed in the current electronic display products to alleviate the problem, but the shielding structures cannot avoid the influence on the light emitting efficiency of the pixels while ensuring a good light shielding effect.

Disclosure of Invention

A first aspect of the present disclosure provides a display substrate including a substrate and a display functional layer and an omnidirectional mirror on the substrate. The display function layer includes a pixel definition layer including a plurality of first openings to define light emitting devices, and a plurality of light emitting devices. The omnibearing reflector is positioned on the light-emitting side of the display functional layer and comprises a plurality of second openings, and the orthographic projection of the second openings on the substrate is at least partially overlapped with the orthographic projection of the first openings on the substrate.

In the above scheme, the omnidirectional reflector is positioned in the gap of the light-emitting device, so that the generation of color mixing can be avoided, and the luminescence performance of the light-emitting device cannot be adversely affected.

In one embodiment of the first aspect of the present disclosure, an orthographic projection of the omnidirectional mirror on the substrate is within an orthographic projection of the pixel defining layer on the substrate, and an orthographic projection of the first opening on the substrate is within an orthographic projection of the second opening on the substrate.

In the above-described aspect, the plane size of the omnidirectional reflector is smaller than the size of the gap (pixel gap) of the light emitting device, thereby being advantageous to ensure the viewing angle of the display image of the display substrate.

In one embodiment of the first aspect of the present disclosure, the light emitting devices are divided into a plurality of types, the predetermined light emitting wavelength ranges of the light emitting devices of the different types are different, and the omnidirectional reflector includes a plurality of stacked units. The laminated units are mutually superposed and divided into a plurality of types so as to respectively reflect light rays with preset light-emitting wavelengths of different types of light-emitting devices. Each laminated unit comprises at least one first film layer and at least one second film layer, the first film layers and the second film layers are alternately arranged, and the refractive index of the first film layers is larger than that of the second film layers. In each laminated unit, at least one first film layer is positioned between the display function layer and at least one second film layer, and the optical thicknesses of the first film layer and the second film layer are odd multiples of a quarter of a preset light-emitting wavelength of the corresponding type of light-emitting device.

In the above scheme, the omnidirectional reflector has a relatively small design thickness so as to be beneficial to the lightening and thinning of the display substrate, and can shield light rays of all colors causing color mixing in the display substrate.

In a specific embodiment of the first aspect of the present disclosure, each of the stacked units includes a plurality of first film layers and a plurality of second film layers, and the first film layers and the second film layers are alternately arranged. For example, further, in each lamination unit, the film layer having the smallest distance to the display function layer is the first film layer, and the film layer having the largest distance to the display function layer is the second film layer. For example, further, in each laminated unit, the optical thickness of the first film layer and the second film layer is equal to a quarter of the preset light-emitting wavelength of the corresponding type of light-emitting device. For example, each of the laminated units further includes no less than 6 of the first film layer and no less than 10 of the second film layer.

In one embodiment of the first aspect of the present disclosure, a stacking direction of the stacking unit is parallel to a plane of the substrate, and between adjacent light emitting devices, the stacking direction of the stacking unit is perpendicular to an extending direction of the adjacent light emitting devices. In each laminated unit, the stacking direction of the first film layer and the second film layer is parallel to the surface of the substrate, and between adjacent light-emitting devices, the stacking direction of the first film layer and the second film layer is perpendicular to the extending direction of the adjacent light-emitting devices.

In the above scheme, the first film layer and the second film layer in the omnibearing reflector are vertically arranged, so that the emergent light of each light-emitting device with a large inclination angle can be reflected to the original light-emitting device, color mixing between pixels is avoided, and the light-emitting efficiency (light-emitting utilization rate) of the light-emitting device is improved.

In a specific embodiment of the first aspect of the present disclosure, in a case where a stacking direction of the stacking unit is parallel to a plane of the substrate, the display substrate further includes an encapsulation layer covering the display function layer, the encapsulation layer includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked in sequence on the display function layer, and the omnidirectional mirror is located between the first inorganic encapsulation layer and the organic encapsulation layer.

In the above scheme, the omnidirectional reflector is embedded in the packaging layer, so that the design thickness of the display substrate cannot be increased due to the omnidirectional reflector, and the light and thin design of the display substrate is facilitated.

In a specific embodiment of the first aspect of the present disclosure, in a case that a stacking direction of the stacked unit is parallel to a surface of the substrate, the display substrate further includes a color film, and the color film is located on a side of the encapsulation layer away from the substrate; or the display substrate further comprises a polarizer, and the polarizer is located on one side of the packaging layer, which is far away from the substrate.

In the above solution, the display substrate may be suitable for a scene provided with a color film or a polarizer when the stacking direction of the stacking unit is parallel to the surface of the substrate.

In a specific embodiment of the first aspect of the present disclosure, the stacking direction of the lamination units is perpendicular to the surface on which the substrate is located, and in each lamination unit, the stacking direction of the first film layer and the second film layer is perpendicular to the surface on which the substrate is located.

In the scheme, the arrangement density of the light-emitting devices is favorably ensured, and the display area of the display substrate has higher resolution.

In one specific embodiment of the first aspect of the present disclosure, in a case where the stacking direction of the stacked units is perpendicular to the plane of the substrate, the surface of the omnidirectional mirror facing the substrate is a plane. For example, the display substrate further includes a color film, the color film is located on a side of the display function layer away from the substrate and includes a plurality of color filters respectively corresponding to the plurality of light emitting devices, and the color of each color filter is the same as the light emitting color of the corresponding light emitting device. For example, further, the omnidirectional reflector is located in the gap of the color filter to be in the same layer as the color filter. For example, further, the display substrate further includes an encapsulation layer covering the display function layer, and the encapsulation layer is located between the color film layer and the display function layer.

In the above scheme, even if the omnidirectional reflector reflects the light with a large inclination angle to the adjacent light emitting device, the reflected light is blocked by the color filter corresponding to the light emitting device when being emitted, so that color mixing of the display image of the display substrate is avoided.

In one specific embodiment of the first aspect of the present disclosure, in a case where the stacking direction of the stacked units is perpendicular to the surface of the substrate, a portion of a surface of the omnidirectional mirror facing the substrate, which portion is located between the adjacent second openings, is a convex surface. For example, the convex surface is one of a V-shaped surface and an arc-shaped surface.

In the above scheme, the omnibearing reflector reflects the large-dip-angle light emitted by each light-emitting device to the original light-emitting device, so that color mixing between pixels is avoided, and the reflected large-dip-angle light can be repeatedly emitted in the light-emitting device by the mode, so that the light-emitting efficiency (light-emitting utilization rate) of the light-emitting device is improved.

In a particular embodiment of the first aspect of the present disclosure, where the substrate-facing surface of the omnidirectional mirror comprises a convex surface, the surface of the pixel defining layer facing away from the substrate is provided with a groove, at least part of the first and second film layers in the omnidirectional mirror conforming to the groove such that the omnidirectional mirror has a convex surface.

In the above solution, at least part of the omnidirectional reflector is actually embedded in the pixel defining layer, so that the increased design thickness of the display substrate caused by the omnidirectional reflector is reduced, and more light rays with large inclination angles can be reflected.

In a specific embodiment of the first aspect of the present disclosure, in a case where a substrate-facing surface of the omnidirectional mirror includes a convex surface, the display substrate further includes an encapsulation layer covering the display functional layer, the encapsulation layer including a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer sequentially stacked on the display functional layer, the omnidirectional mirror being located between the first inorganic encapsulation layer and the organic encapsulation layer.

In the above scheme, the omnidirectional reflector is embedded in the packaging layer, so that the design thickness of the display substrate cannot be increased due to the arrangement of the omnidirectional reflector, and the light and thin design of the display substrate is facilitated.

In a specific embodiment of the first aspect of the present disclosure, in a case that a surface of the omnidirectional reflector facing the substrate includes a convex surface, the display substrate further includes a color film, and the color film is located on a side of the encapsulation layer away from the substrate; or the display substrate further comprises a polarizer, and the polarizer is positioned on one side of the packaging layer, which is deviated from the substrate.

In the above scheme, the display substrate may be suitable for a scene provided with a color film or a polarizer when the surface of the omnidirectional reflector facing the substrate includes a convex surface.

A second aspect of the present disclosure provides a display panel, which may include the display substrate of the first aspect.

Drawings

Fig. 1 is a schematic plan view illustrating a display substrate according to an embodiment of the disclosure.

FIG. 2 is a schematic cross-sectional view of the display substrate shown in FIG. 1 taken along line M-N.

Fig. 3 is a schematic structural diagram of an omnidirectional reflector in the display substrate shown in fig. 2.

Fig. 4 is a cross-sectional view of a partial area of a display substrate according to an embodiment of the disclosure.

Fig. 5 is a schematic structural diagram of an omnidirectional reflector in another display substrate according to an embodiment of the disclosure.

Fig. 6 is a sectional view of a partial region of a display substrate including the omni-directional mirror shown in fig. 5.

Fig. 7 is a cross-sectional view of a partial area of another display substrate according to an embodiment of the disclosure.

Fig. 8 is a cross-sectional view of a partial area of another display substrate according to an embodiment of the disclosure.

Fig. 9 is a cross-sectional view of a partial area of another display substrate according to an embodiment of the disclosure.

Fig. 10 is a cross-sectional view of a partial area of another display substrate according to an embodiment of the disclosure.

Fig. 11 is a cross-sectional view of a partial area of another display substrate according to an embodiment of the disclosure.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present specification without making any creative effort belong to the protection scope of the present specification.

The self-luminous display panel is provided with light emitting devices arranged in an array, and the light emitting devices form a main body structure of a pixel (sub-pixel). Light rays are emitted circumferentially when a light emitting body (light emitting layer) of the light emitting device is excited, and thus even if the light emitting devices are arranged at intervals, the light rays with large inclination angles emitted by the light emitting devices may be emitted from adjacent light emitting devices or light emitting devices with farther intervals, thereby causing cross color between pixels to cause the reduction of the quality of a displayed image.

In one solution to the above problem, the black matrix is added to cover the pixel gap, but the black matrix actually has a certain light transmittance, and particularly has a higher transmittance (generally 5% to 10%) for short-wavelength light (such as blue light), so that light cannot be effectively shielded; in addition, the black matrix absorbs light, so that the light emitted by the light emitting device cannot be effectively utilized, the light emitting utilization rate of the light emitting device is correspondingly reduced, and the brightness of the display image of the display panel is reduced and the power consumption is increased.

In another solution to the above problem, a light absorbing layer or a reflecting layer may be disposed around the light emitting device to absorb or reflect the light with a large tilt angle emitted from the light emitting device. For the light absorption layer, the design can absorb a large amount of light with a large inclination angle to reduce the light extraction efficiency, and can cause the heat near the light emitting device to rise due to the absorption of the light, thereby affecting the performance of the light emitting device; for the reflective layer, the reflective layer is disposed around the light emitting device, and the reflective layer is required to be made of a metal material due to requirements of high reflectivity, low thickness, stable properties, and the like, and the metal material and the light emitting excitons in the light emitting device generate surface plasmon resonance, thereby reducing the light emitting efficiency of the light emitting device. In addition, the light absorbing layer and the reflective layer need to be disposed adjacent to the light emitting device, which has a limited design height, and thus the effect of improving color crosstalk in this manner is limited.

In view of the above, the present disclosure provides a display substrate and a display device, which use an omnidirectional reflector to reflect light with a large tilt angle, so as to improve the color crosstalk between pixels. The display substrate comprises a substrate, and a display functional layer and an omnidirectional reflector which are positioned on the substrate. The display function layer includes a pixel definition layer including a plurality of first openings to define light emitting devices, and a plurality of light emitting devices. The omnibearing reflector is positioned on the light-emitting side of the display functional layer and comprises a plurality of second openings, and the orthographic projection of the second openings on the substrate is at least partially overlapped with the orthographic projection of the first openings on the substrate. In the design, the omnidirectional reflector is positioned in the gap of the light-emitting device to reflect the light rays emitted by the light-emitting device within a large inclination angle range, so that the light rays emitted by the light-emitting device are prevented from being directly emitted from the area where the adjacent light-emitting device is positioned, and the generation of mixed color is avoided; in addition, the omnidirectional reflector is positioned in the gap of the light-emitting device and on the light-emitting side of the display function layer, and has a certain spacing distance with the light-emitting device, so that the light-emitting performance of the light-emitting device cannot be adversely affected.

Next, structures of a display substrate and a display device according to at least one embodiment of the present disclosure will be described with reference to the drawings. In addition, a spatial rectangular coordinate system is established with reference to a surface on which the display substrate is located (for example, a display surface thereof) to describe a positional relationship of each element in the display substrate. In the rectangular space coordinate system, the X axis and the Y axis are parallel to the surface of the display substrate, and the Z axis is perpendicular to the surface of the display substrate.

As shown in fig. 1 to 4, the planar structure of the display substrate 10 may be divided into a display area 11 and a frame area 12 surrounding the display area 11. A bonding area 13 for overlapping with an external circuit (e.g., a flexible circuit board) is provided in the bezel area 12. A plurality of pixels R, G, and B emitting light of different colors are arranged in the display region 11. The display substrate 10 may include a substrate 100, and a display functional layer 200 and an omni-directional mirror 300 on the substrate 100. The display function layer 200 includes a pixel defining layer 210 and a light emitting device 220 in each pixel, and the pixel defining layer 210 includes a plurality of first openings 201 to define the position of the light emitting device 220. The omnidirectional reflector 300 is disposed on the light exit side of the display functional layer 200, and the omnidirectional reflector 300 is located in the pixel gap, that is, the omnidirectional reflector 300 is disposed to include a plurality of second openings 301, and the second openings 301 correspond to the first openings 201 so that the light emitted from the light emitting device is not blocked by the omnidirectional reflector 300, that is, the orthographic projection of the second openings 301 on the substrate 100 at least partially overlaps the orthographic projection of the first openings 201 on the substrate 100.

For example, the light emitting device 220 may include an anode 221, a cathode 222, and a light emitting functional layer 223 between the anode 221 and the cathode 222, which are stacked on the substrate 100. The light emitting function layer 223 includes a light emitting layer in the first opening 201, and may further include other function layer films such as a hole injection layer, a hole transport layer, an electron injection layer, an electron transport layer, a hole blocking layer, an electron blocking layer, and the like, which may extend out of the first opening 201 to cover the pixel defining layer 210, thereby forming a common layer of each light emitting device 220. It is noted that the portion of the common layer outside the first opening 201 is mainly present due to process requirements and does not actually participate in the formation of the body structure of the light emitting device 220. Similarly, the cathode 222 may be disposed to cover the pixel defining layer 210 to be a common electrode for all the light emitting devices 220.

For example, the substrate 100 may be an array substrate, which may include a substrate and a driving circuit layer, the driving circuit layer may include a pixel driving circuit located in the display region 11, and the pixel driving circuit may include a plurality of transistors 110, capacitors, and the like, for example, in various forms such as 2T1C (i.e., 2 transistors 110 (TFTs) and 1 capacitor (C)), 3T1C, or 7T1C, in a pixel corresponding to each light emitting device. The pixel driving circuit is connected to the light emitting device 220 to control the on/off state and the light emitting brightness of the light emitting device 220.

In at least one embodiment of the present disclosure, the second opening may be designed to be opposite to the first opening, but the size of the second opening is larger than that of the first opening, so that the planar size of the omni-directional mirror is smaller than that of the gap (pixel gap) of the light emitting device to facilitate to secure the viewing angle of the display image of the display substrate. Specifically, as shown in fig. 1 to 4, an orthogonal projection of the omnidirectional mirror 300 on the substrate 100 is located within an orthogonal projection of the pixel defining layer 210 on the substrate 100, and an orthogonal projection of the first opening 201 on the substrate 100 is located within an orthogonal projection of the second opening 301 on the substrate 100.

It should be noted that, in the case of the display substrate adopting the technical solution of the present disclosure, if the light emitted from the light emitting device is reflected to the adjacent light emitting device emitting light of another color, the reflected light is difficult to be emitted again, so that a serious cross color problem is not caused, which is related to the module structure and the display mode of the display substrate.

For example, light emitting devices are often configured as micro-cavity structures (e.g., cavities defined by an anode and a cathode) that allow light of a particular color (wavelength range) to be emitted with increased intensity, and light of other colors entering the micro-cavity and then being difficult to re-emit and gradually dissipate. For example, a large-inclination-angle red light emitted from a light emitting device emitting red light is reflected by an omnidirectional reflector to an adjacent light emitting device emitting green light, the red light cannot interfere and grow in a microcavity structure of the light emitting device emitting green light, so that the red light is difficult to escape from the microcavity structure, and after the red light is reflected for multiple times, the energy of the red light is gradually exhausted and dissipated. However, it should be noted that, without the technical solution of the present disclosure, because the light emitting devices for emitting the red light and the green light are disposed in the same layer, the red light emitted at a large inclination angle does not enter the adjacent green light emitting device, but is emitted from above the green light emitting device, in which case, a crosstalk problem may occur.

For example, in some scenes, a color film may be disposed on the light-emitting side of the display substrate, where the color film includes a color filter corresponding to the light-emitting device, and the color of the color filter is the same as the preset light-emitting color of the corresponding light-emitting device, so as to filter light of other colors. For example. The large-inclination-angle red light emitted by the light emitting device emitting the red light is reflected by the omnidirectional reflector to the adjacent light emitting device emitting the green light, and then is absorbed by the green color filter, so that the red light is not emitted, and the problem of crosstalk can be improved.

It should be noted that, in the embodiments of the present disclosure, the omnidirectional reflector is configured to reflect light, which may have the effect of improving crosstalk. On this basis, the omnidirectional reflector can be selectively designed to reflect all visible light, or the structure of the omnidirectional reflector can be further designed according to the preset light-emitting color of the display substrate, so as to simplify the construction difficulty of the omnidirectional reflector. Next, the structure of the display panel in the latter option will be described by way of several specific embodiments.

For example, in at least one embodiment of the present disclosure, the light emitting devices may be divided into a plurality of types, different types of light emitting devices have different predetermined light emitting wavelength ranges (corresponding to different light emitting colors), and the omnidirectional reflector includes a plurality of stacked units. The stacked units are stacked on each other and divided into a plurality of types to reflect light of preset light-emitting wavelengths of different types of light-emitting devices, respectively, that is, each type of stacked unit is used for reflecting light of a specific wavelength range, so that the number of types of light-emitting devices can be the same as the number of types of stacked units. Each laminated unit comprises at least one first film layer and at least one second film layer, the first film layers and the second film layers are alternately arranged, the refractive index of the first film layers is larger than that of the second film layers, and therefore, at the interface of the first film layers and the second film layers, when light enters the light-sparse material from the light-dense material, certain reflection (total reflection can occur when incidence with a large inclination angle) can be generated. In each laminated unit, at least one first film layer is positioned between the display function layer and at least one second film layer, and the optical thicknesses of the first film layer and the second film layer are odd times of a quarter of a preset light-emitting wavelength of the corresponding type of light-emitting device. So, the module structure of all-round speculum designs based on display substrate's light-emitting colour, promptly, to the light of the different colours (wavelength range) of the sub-pixel outgoing of different grade type, reflects through the stromatolite unit of different grade type, so, can make all-round speculum have relatively less design thickness in order to do benefit to display substrate's frivolousization, shelter from to arousing all colored light of colour mixture in the display substrate.

Illustratively, as shown in fig. 1 to 4, the display substrate includes three light emitting devices to emit three colors of light, red (R), green (G), and blue (B), respectively, the omnidirectional reflector 300 includes 3 stacked units 310a, 310B, and 310c, the optical thicknesses of the first film layer 311 and the second film layer 312 in the stacked unit 310a are designed to be 1/4 of the wavelength of red light (e.g., the central wavelength of the wavelength range corresponding to the red light), and accordingly, the stacked unit 310B and the stacked unit 310c are similarly designed for the wavelength of green light and the wavelength of blue light, respectively. Thus, the red light (R) is reflected after entering the stacked unit 310a, while the green light (G) and the blue light (B) pass through the stacked units 310B and 310c, and similarly, the green light (G) is reflected by the stacked unit 310B to pass through the stacked units 310a and 310c, and the blue light (B) is reflected by the stacked unit 310c to pass through the stacked units 310a and 310B. Therefore, the omnidirectional reflector 300 may reflect any light emitted from the light emitting device of the display substrate.

It should be noted that the optical thickness of a film is the product of the actual thickness of the film and its refractive index.

In at least one embodiment of the present disclosure, the reflection effect of the stacked unit on light rays in a corresponding wavelength range can be improved by increasing the number of the first film layers and the second film layers in the stacked unit, that is, each stacked unit includes a plurality of first film layers and a plurality of second film layers, and the first film layers and the second film layers are alternately arranged. Therefore, in the process of designing the film layers of the omnibearing reflector, the number of the laminated units, the number of the first film layers and the second film layers in each laminated unit and the design thickness (the optical thickness can be used for pushing out the real thickness) can be adjusted, so that the omnibearing reflector has relatively small design thickness while the reflection effect of the omnibearing reflector is ensured, the process flow and the difficulty of the display substrate are favorably reduced, and the display substrate is favorably designed in a light and thin mode.

In the following, several specific designs of the membrane layers in the lamination unit are exemplified.

For example, as shown in fig. 1 to 4, in each of the laminated units 310a, 310b, and 310c, light emitted from the light emitting device is preferentially incident from a high refractive index material (the second film layer 312), that is, the film layer having the smallest distance to the display function layer 200 is the first film layer 311, and the film layer having the largest distance from the display function layer is the second film layer 312.

For example, as shown in fig. 1 to 4, in each of the stacked units 310a, 310b, and 310c, while ensuring the reflection effect, the thicknesses of the first film layer 311 and the second film layer 312 may be designed to be minimum, for example, the optical thicknesses of the first film layer 311 and the second film layer 312 are equal to a quarter of the preset light-emitting wavelength of the corresponding type of light-emitting device.

For example, in embodiments of the present disclosure, each of the stacked units includes no less than 6 of the first film layer and the second film layer, for example, further, each of the stacked units includes no more than 10 of the first film layer and the second film layer. Within the above data range, the stacked unit may have a relatively small design thickness and a high reflection effect on light in a corresponding wavelength range, which can be specifically seen from the experimental test results shown in table 1 below.

TABLE 1

In this experimental test, in the laminated unit in samples 1 to 4, the material of the first film layer is titanium oxide, and the material of the second film layer is magnesium fluoride. Further, the design parameters of the omnidirectional mirrors in samples 1 to 4 in this list are as follows.

Sample 1: three kinds of stacked units 310a, 310b, and 310c are provided, and the number of the first film layer 311 and the second film layer 312 in each of the stacked units 310a, 310b, and 310c is 6 each. In the stacked unit 310a, the thickness of the first film layer 311 is 66 nm, and the thickness of the second film layer is 111 nm; in the stacked unit 310b, the thickness of the first film layer 311 is 55 nm, and the thickness of the second film layer is 93 nm; in the stacked unit 310c, the thickness of the first film layer 311 is 48 nm, and the thickness of the second film layer is 81 nm.

Sample 2: three kinds of lamination units 310a, 310b, and 310c are provided, and the number of the first film layer 311 and the second film layer 312 in each lamination unit 310a, 310b, and 310c is 8 each. In the stacked unit 310a, the thickness of the first film layer 311 is 66 nm, and the thickness of the second film layer is 111 nm; in the stacked unit 310b, the thickness of the first film layer 311 is 55 nm, and the thickness of the second film layer is 93 nm; in the stacked unit 310c, the thickness of the first film layer 311 is 48 nm, and the thickness of the second film layer is 81 nm.

Sample 3: three kinds of stacked units 310a, 310b, and 310c are provided, and the number of the first film layer 311 and the second film layer 312 in each of the stacked units 310a, 310b, and 310c is 10 each. In the stacked unit 310a, the thickness of the first film layer 311 is 66 nm, and the thickness of the second film layer is 111 nm; in the stacked unit 310b, the thickness of the first film layer 311 is 55 nm, and the thickness of the second film layer is 93 nm; in the stacked unit 310c, the thickness of the first film layer 311 is 48 nm, and the thickness of the second film layer is 81 nm.

Sample 4: four kinds of stacked units are provided, and the number of the first film layer 311 and the second film layer 312 in each stacked unit is 6. In the first stacked unit, the thickness of the first film layer 311 is 93 nm, and the thickness of the second film layer is 162 nm; in the second stacked unit, the thickness of the first film layer 311 is 77 nm, and the thickness of the second film layer is 129 nm; in the third stacked unit, the thickness of the first film layer 311 is 61 nm, and the thickness of the second film layer is 102 nm; in the fourth stacked unit, the thickness of the first film layer 311 is 61 nm, and the thickness of the second film layer is 181 nm.

Based on the data in table 1, it can be seen that when three kinds of stacked units are provided, and the number of the first film layer and the second film layer in each stacked unit is 10, the reflection efficiency of the omnidirectional mirror for three kinds of wavelength light is already lower than 1%, and the display brightness of the display panel under the same current driving is the highest. The aperture ratio of the display substrate used for the luminance test was 4% for the red pixel, 6% for the green pixel, and 8% for the blue pixel, and the current density for application was 40.2mA/cm ² 。

It should be noted that, in the embodiments of the present disclosure, the materials of the first film layer and the second film layer are not limited, and may be designed according to actual needs. For example, the refractive index of the first film layer may be in the range of 2.0 to 2.6, and the material thereof may be TiO ₂ 、Ta ₂ O ₅ Inorganic substances such as ZnO and ZnS, and organic substances such as arylamine derivatives, quinolinone derivatives, and benzoazacyclo derivatives; the refractive index of the second film layer can be 1.3-1.7, and the material can be MgF ₂ 、SiO ₂ 、AlF ₃ 、BaF ₂ Examples of the inorganic substance include organic substances such as silicone resin, polymethyl methacrylate, and epoxy resin.

For example, in an embodiment of the present disclosure, the thickness of the first film layer in the stacked unit 310a may be 60 to 80nm, and the thickness of the second film layer in the stacked unit 310a may be 90 to 120nm; the thickness of the first film layer in the stacked unit 310b may be 50 to 70nm, and the thickness of the second film layer in the stacked unit 310a may be 75 to 100nm; the thickness of the first film layer in the stacked unit 310c may be 40 to 60nm, and the thickness of the second film layer in the stacked unit 310a may be 65 to 85nm.

It should be noted that, in the embodiments of the present disclosure, the stacking direction of the film layers in the omnidirectional reflector may be designed according to actual needs to determine the reflection direction of the light with large inclination angle. The following description will be made by way of several specific examples.

In some embodiments of the present disclosure, as shown in fig. 5 to 6, the respective film layers of the stacked units 310a to 310c in the omnidirectional reflector 300 are vertically arranged, that is, the stacking direction of the stacked units 310a to 310c is parallel to the plane of the substrate 100, and between the adjacent light emitting devices 220, the stacking direction of the stacked units 310a to 310c is perpendicular to the extending direction of the adjacent light emitting devices 220. In each of the lamination units 310a to 310c, the lamination direction of the first and second film layers 311 and 312 is parallel to the plane of the substrate 100, and between the adjacent light emitting devices 220, the lamination direction of the first and second film layers 311 and 312 is perpendicular to the extending direction of the adjacent light emitting devices 220. In this design, first rete 311 and second rete 312 in the all-round speculum 300 erect the setting to can reflect the big inclination light of every luminescent device 220 outgoing to former luminescent device in, thereby avoid appearing mixing of colors between the pixel, this mode can make the big inclination light of reflection back repeat the outgoing in this luminescent device moreover, thereby improved luminescent device's luminous efficacy (light-emitting utilization ratio).

In the embodiment of the present disclosure, as shown in fig. 5 and 6, in the case where the stacking direction of the lamination units 310a to 310c is parallel to the plane of the substrate 100, the display substrate may further include an encapsulation layer 400 covering the display function layer 200, and the encapsulation layer 400 includes a first inorganic encapsulation layer 410, an organic encapsulation layer 420, and a second inorganic encapsulation layer 430 sequentially stacked on the display function layer 200.

For example, the materials of the first inorganic encapsulation layer 410 and the second inorganic encapsulation layer 430 may include inorganic materials, such as silicon nitride, silicon oxide, silicon oxynitride, and the like, which have high compactness and can prevent the intrusion of water, oxygen, and the like; for example, the material of the organic encapsulation layer 420 may be a polymer material containing a desiccant, a polymer material capable of blocking moisture, or the like, such as a polymer resin, to planarize the surface of the display panel, and may relieve the stress of the first inorganic encapsulation layer 410 and the second inorganic encapsulation layer 430, and the organic encapsulation layer 420 may further include a water-absorbent material such as a desiccant to absorb water, oxygen, and other substances that invade into the inside. The inorganic material has high denseness, and the display functional layer 200 can be protected by the first inorganic sealing layer 410. The organic encapsulation layer 420 has a large thickness, which is beneficial to the surface planarization of the display substrate.

For example, the omni-directional mirror 300 is positioned between the first inorganic encapsulation layer 410 and the organic encapsulation layer 420. As such, the omni-directional reflector 300 is positioned on the first inorganic encapsulation layer 410, and thus, the light emitting device 220 may be protected by the first inorganic encapsulation layer 410 in the process of manufacturing the omni-directional reflector; in addition, the organic encapsulation layer 420 covers the omnidirectional reflector 300, which is equivalent to embedding the omnidirectional reflector 300 in the encapsulation layer 400, so that the design thickness of the display substrate is not increased by the arrangement of the omnidirectional reflector 300, and the light and thin design of the display substrate is facilitated.

In some embodiments of the disclosure, as shown in fig. 5 and fig. 6, in a case that the stacking direction of the stack units 310a to 310c is parallel to the surface of the substrate 100, the display substrate may further include a color film 500, the color film 500 is located on a side of the encapsulation layer 400 away from the substrate, and the color film 500 may include color filters 510 to 530 of different colors to correspond to the light emitting devices 220 emitting light of different colors. For example, the display substrate may further include a black matrix 600 for blocking light emitted to the pixel gap.

In other embodiments of the present disclosure, as shown in fig. 5 and 7, in the case that the stacking direction of the stacked units 310a to 310c is parallel to the plane of the substrate 100, the display substrate may further include a polarizer 700, and the polarizer 700 is located on the side of the encapsulation layer 400 away from the substrate 100 to eliminate the influence of ambient light on the display effect of the display substrate.

In other embodiments of the present disclosure, referring back to fig. 3 to 4, the respective film layers of the stacked units 310a to 310c in the omnidirectional mirror 300 are laterally arranged, that is, the stacking direction of the stacked units 310a to 310c is perpendicular to the plane of the substrate 100, and in each of the stacked units 310a to 310c, the stacking direction of the first film layer 311 and the second film layer 312 is perpendicular to the plane of the substrate 100. In this design, the increase in the number of the stacked units 310a to 310c and the increase in the thickness and number of the first film layer 311 and the second film layer 312 included in the stacked units 310a to 310c does not affect the gap of the light emitting device 220, thereby being beneficial to ensuring the arrangement density of the light emitting devices 220 (pixels) and ensuring that the display area of the display substrate has higher resolution.

In some embodiments of the present disclosure, as shown in fig. 3 and 4, in the case where the stacking direction of the stacked units 310a to 310c is perpendicular to the plane of the substrate 100, the surface of the omnidirectional mirror 300 facing the substrate 100 may be a plane. In this case, the omnidirectional reflector 300 can serve as a principle for eliminating the crosstalk problem, and reference may be made to the related description of the embodiments shown in fig. 1 to fig. 4 in the foregoing embodiments, which are not described herein again.

In some embodiments of the present disclosure, as shown in fig. 3 and 4, in a case that the stacking direction of the stacking units 310a to 310c is perpendicular to the plane of the substrate 100, the display substrate may further include a color film 500, the color film 500 is located on a side of the display function layer 100 away from the substrate 100 and includes a plurality of color filters 510 to 530 corresponding to the plurality of light emitting devices 220, respectively, and the color of the color filters 510 to 530 is the same as the light emitting color of the corresponding light emitting devices 220.

For example, as shown in fig. 4, in the case where the stacking direction of the stacked units 310a to 310c is perpendicular to the surface of the substrate 100, the omnidirectional reflector 300 is located in the gap between the color filters 510 to 530 to be layered with the color filter 500. Thus, even if the omnidirectional reflector reflects the light with a large inclination angle to the adjacent light emitting device 220, the reflected light is blocked by the color filters 510 to 530 corresponding to the light emitting device 220 when exiting, thereby preventing color mixing of the display image of the display substrate.

For example, as shown in fig. 4, in the case that the stacking direction of the stacking units 310a to 310c is perpendicular to the plane of the substrate 100, the display substrate further includes an encapsulation layer 400 covering the display function layer 100, and the encapsulation layer 400 is located between the color film layer 500 and the display function layer 100. In this embodiment, the surface of the display substrate is planarized by the encapsulation layer 400, thereby also facilitating the production yield of the omnidirectional reflector 300.

In some embodiments of the present disclosure, as shown in fig. 8, in the case where the stacking direction of the lamination unit is perpendicular to the plane of the substrate 100, the omnidirectional mirror 300 may be disposed in a concave structure such that the film-stacking direction of different portions of the omnidirectional mirror 300 is different, that is, in the surface of the omnidirectional mirror 300 facing the substrate 100, portions between adjacent second openings are convex. In this design, the omnidirectional reflector 300 reflects the large-inclination light emitted from each light emitting device 220 to the original light emitting device 220, thereby preventing color mixing between pixels, and the reflected large-inclination light can be repeatedly emitted from the light emitting device 220 by this method, thereby improving the light emitting efficiency (light utilization rate) of the light emitting device 220.

In some embodiments of the present disclosure, as shown in fig. 8, in a case where the stacking direction of the stacked units is perpendicular to the plane of the substrate 100, the surface of the pixel defining layer 210 facing away from the substrate 100 is provided with a groove, and at least a portion of the first film layer 311 and the second film layer 312 in the omnidirectional mirror 300 conforms to the groove, so that the omnidirectional mirror 300 has a convex surface. In this design, at least a portion of the omnidirectional mirror 300 is actually embedded in the pixel defining layer 210, thereby reducing the increased design thickness of the display substrate 100 resulting from the provision of the omnidirectional mirror 300; in addition, the pixel definition layer 210 serves to define the light emitting device 220 such that the omni-directional reflector 300 has a relatively small distance from the light emitting device 220 while being spaced apart from the light emitting device 220 to reflect more light rays having a large inclination angle; in addition, the thickness of the pixel defining layer 210 is larger, and the pixel defining layer 210 is used to make a groove, so that the groove has a relatively larger depth to improve the reflection range of the omnidirectional reflector 300.

In some embodiments of the present disclosure, as shown in fig. 8, in case that a surface of the omnidirectional mirror 300 facing the substrate 100 includes a convex surface, the display substrate further includes an encapsulation layer 400 covering the display functional layer, the encapsulation layer 400 including a first inorganic encapsulation layer 410, an organic encapsulation layer 420 and a second inorganic encapsulation layer 430 sequentially stacked on the display functional layer, the omnidirectional mirror 300 being located between the first inorganic encapsulation layer 410 and the organic encapsulation layer 420. As such, the omni-directional reflector 300 is positioned on the first inorganic encapsulation layer 410, and thus, in the process of manufacturing the omni-directional reflector 300, the light emitting device may be protected by the first inorganic encapsulation layer 410; in addition, the organic encapsulation layer 420 covers the omnidirectional reflector 300, which is equivalent to embedding the omnidirectional reflector 300 in the encapsulation layer 400, so that the design thickness of the display substrate is not increased by the arrangement of the omnidirectional reflector 300, and the light and thin design of the display substrate is facilitated.

It should be noted that, in the embodiments of the present disclosure, the shape of the concave surface is not limited. For example, the convex surface may be an arc surface as shown in fig. 8, or may be a V surface as shown in fig. 9.

In some embodiments of the present disclosure, as shown in fig. 10, in a case that a surface of the omnidirectional reflector 300 facing the substrate 100 includes a convex surface, the display substrate further includes a color film 500, and the color film 500 is located on a side of the encapsulation layer 400 away from the substrate 100. The color filter 500 may include color filters of different colors to correspond to the light emitting devices 220 emitting light of different colors. For example, the display substrate may further include a black matrix 600 for blocking light emitted to the pixel gap.

In other embodiments of the present disclosure, as shown in fig. 11, in the case that the surface of the omnidirectional reflector 300 facing the substrate 100 includes a convex surface, the display substrate further includes a polarizer 700, and the polarizer 700 is located on the side of the encapsulation layer 400 facing away from the substrate to eliminate the influence of the ambient light on the display effect of the display substrate.

At least one embodiment of the present disclosure also provides a display device, which may include the above-described display panel. For example, the display device may further include other functional structures, for example, the display device may further include a touch structure to have a touch function. For example, the touch structure may be a touch panel or a touch layer, and the touch panel may be disposed on the display panel in a manner of being attached to the display panel, for example, the touch panel is disposed on a light-emitting side of the display panel; the touch layer can be directly prepared on the packaging layer of the display panel, so that the light and thin design of the display panel is facilitated.

For example, the display device in the embodiments of the present disclosure may be any product or component having a display function, such as a television, a digital camera, a mobile phone, a watch, a tablet computer, a notebook computer, and a navigator.

The above description is meant to be illustrative of the preferred embodiments of the present disclosure and not to be taken as limiting the disclosure, as the invention is intended to cover any modifications, equivalents, etc. which fall within the spirit and scope of the present disclosure.

Claims (10)

1. A display substrate, comprising:

a substrate;

a display functional layer including a pixel definition layer and a plurality of light emitting devices, the pixel definition layer including a plurality of first openings to define the light emitting devices;

and the omnibearing reflector is positioned on the light emergent side of the display functional layer and comprises a plurality of second openings, and the orthographic projection of the second openings on the substrate is at least partially overlapped with the orthographic projection of the first openings on the substrate.

2. The display substrate of claim 1,

an orthographic projection of the omnidirectional mirror on the substrate is located within an orthographic projection of the pixel defining layer on the substrate, an

An orthographic projection of the first opening on the substrate is located within an orthographic projection of the second opening on the substrate.

3. The display substrate according to claim 1 or 2, wherein the light emitting devices are divided into a plurality of types, and predetermined light emitting wavelength ranges of the light emitting devices of the different types are different, and the omnidirectional reflector comprises:

the plurality of laminated units are mutually laminated and divided into a plurality of types so as to respectively reflect light rays with preset light-emitting wavelengths of the light-emitting devices of different types;

wherein each laminated unit comprises at least one first film layer and at least one second film layer, the first film layers and the second film layers are alternately arranged, the refractive index of the first film layers is greater than that of the second film layers,

in each lamination unit, at least one first film layer is located between the display function layer and at least one second film layer, and the optical thicknesses of the first film layer and the second film layer are odd multiples of a quarter of a preset light-emitting wavelength of the corresponding type of light-emitting device.

4. The display substrate of claim 3,

each lamination unit comprises a plurality of first film layers and a plurality of second film layers, and the first film layers and the second film layers are alternately arranged;

preferably, in each of the laminated units, the film layer having the smallest distance to the display function layer is the first film layer, and the film layer having the largest distance to the display function layer is the second film layer;

preferably, in each of the laminated units, the optical thickness of the first film layer and the second film layer is equal to a quarter of a preset light-emitting wavelength of the corresponding type of the light-emitting device;

preferably, each of the laminated units includes no less than 6 of the first film layer and no more than 10 of the second film layer.

5. The display substrate of claim 3,

the stacking direction of the stacking unit is parallel to the surface of the substrate and is perpendicular to the extending direction of the adjacent light-emitting devices between the adjacent light-emitting devices, an

In each lamination unit, the lamination direction of the first film layer and the second film layer is parallel to the surface of the substrate, and between the adjacent light-emitting devices, the lamination direction of the first film layer and the second film layer is perpendicular to the extending direction of the adjacent light-emitting devices;

preferably, the display substrate further includes an encapsulation layer covering the display functional layer, the encapsulation layer includes a first inorganic encapsulation layer, an organic encapsulation layer and a second inorganic encapsulation layer sequentially stacked on the display functional layer, and the omnidirectional reflector is located between the first inorganic encapsulation layer and the organic encapsulation layer;

further preferably, the display substrate further includes a color film, and the color film is located on one side of the encapsulation layer away from the substrate; or the display substrate further comprises a polarizer, and the polarizer is located on one side of the packaging layer, which is far away from the base.

6. The display substrate of claim 3,

the stacking direction of the stacking units is perpendicular to the surface of the substrate, and in each stacking unit, the stacking direction of the first film layer and the second film layer is perpendicular to the surface of the substrate.

7. The display substrate of claim 6,

the surface of the omnibearing reflector facing the substrate is a plane;

preferably, the display substrate further includes a color film, the color film is located on a side of the display function layer away from the substrate, and includes a plurality of color filters respectively corresponding to the plurality of light emitting devices, and the color of the color filter is the same as the light emitting color of the corresponding light emitting device;

further preferably, the omnidirectional reflector is located in a gap of the color filter so as to be in the same layer as the color filter;

further preferably, the display substrate further includes an encapsulation layer covering the display function layer, and the encapsulation layer is located between the color film layer and the display function layer.

8. The display substrate of claim 6,

a portion of a surface of the omnidirectional mirror facing the substrate, which is located between the adjacent second openings, is convex;

preferably, the convex surface is one of a V-shaped surface and an arc-shaped surface.

9. The display substrate of claim 8,

a surface of the pixel defining layer facing away from the substrate is provided with a groove, at least portions of the first and second film layers of the omnidirectional mirror conforming to the groove such that the omnidirectional mirror has the convex surface;

preferably, the display substrate further includes an encapsulation layer covering the display functional layer, the encapsulation layer includes a first inorganic encapsulation layer, an organic encapsulation layer and a second inorganic encapsulation layer sequentially stacked on the display functional layer, and the omnidirectional reflector is located between the first inorganic encapsulation layer and the organic encapsulation layer;

further preferably, the display substrate further includes a color film, and the color film is located on one side of the encapsulation layer away from the substrate; or, the display substrate further comprises a polarizer, and the polarizer is located on one side of the packaging layer, which is far away from the base.

10. A display panel comprising the display substrate according to any one of claims 1 to 9.

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