CN115942834A - Electroluminescent diode display substrate, display device and manufacturing method - Google Patents

Abstract

The invention discloses an electroluminescent diode display substrate, a display device and a manufacturing method, wherein the display substrate of one embodiment comprises: make a video recording under the screen district and at least part around the display area in the district of making a video recording under the screen, the district of making a video recording under the screen includes: a substrate; the array structure comprises a plurality of sub-pixels arranged on a substrate in an array mode and a light-transmitting area located between the sub-pixels, wherein at least one sub-pixel in the sub-pixels comprises a light-emitting element, and the light-emitting element comprises a first electrode, an organic light-emitting layer and a second electrode which are sequentially far away from the substrate; the light-transmitting film is positioned between the second electrodes, the orthographic projection of the light-transmitting film on the substrate is at least partially overlapped with the orthographic projection of the light-transmitting area on the substrate, and the light transmittance of the light-transmitting film is greater than that of the second electrodes. According to the embodiment of the invention, the light-transmitting film which is arranged between the second electrodes and corresponds to the light-transmitting area can reduce poor display caused by reflection of the second electrodes, and effectively improve the display effect of the display substrate.

Description

Electroluminescent diode display substrate, display device and manufacturing method

Technical Field

The invention relates to the technical field of display, in particular to an electroluminescent diode display substrate, a display device and a manufacturing method.

Background

In recent years, high-screen ratio display becomes a large selling point sought by high-end mobile phones, more and more mobile phones adopt perforated screens to process the positions of cameras, but a black dot exists in the middle of the display of the screens, which always influences the attractiveness of the mobile phones, so that the under-screen camera adopting the transparent display technology is produced.

However, there is a difference problem between the display effect of the camera area under the screen and the display effect of the surrounding area, and especially, the light transmittance of the pixel area is reduced due to the reflection caused by the cathode film layer, thereby affecting the overall display effect.

Disclosure of Invention

In order to solve at least one of the above problems, a first aspect of the present invention provides an electroluminescent diode display substrate, including a sub-panel imaging area and a display area at least partially surrounding the sub-panel imaging area, the sub-panel imaging area including:

a substrate;

the array structure comprises a plurality of sub-pixels arranged on a substrate in an array mode and a light-transmitting area located between the sub-pixels, wherein at least one sub-pixel in the sub-pixels comprises a light-emitting element, and the light-emitting element comprises a first electrode, an organic light-emitting layer and a second electrode which are sequentially far away from the substrate and the light-transmitting area arranged among the sub-pixels;

and the light transmission film is positioned between the second electrodes, the orthographic projection of the light transmission film on the substrate is at least partially overlapped with the orthographic projection of the light transmission area on the substrate, and the light transmittance of the light transmission film is greater than that of the second electrodes.

Furthermore, the light-transmitting films and the light-transmitting areas are arranged in a one-to-one correspondence manner, the second electrodes surround the light-transmitting films, and the orthographic projection of the light-transmitting films on the substrate is located in the orthographic projection of the light-transmitting areas on the substrate.

Furthermore, the under-screen image pickup area comprises signal wiring connected with each sub-pixel, and the orthographic projection of the light-transmitting film on the substrate is not overlapped with the orthographic projection of the signal wiring on the substrate.

Further, the under-screen image pickup region includes a driving circuit layer disposed on the substrate, the driving circuit layer includes driving circuits for driving the sub-pixels, respectively, the signal trace includes a scanning signal line connected to the driving circuits and extending in a first direction, and a data signal line connected to the driving circuits and extending in a second direction crossing the first direction,

the light-transmitting area is an area surrounded by the sub-pixel, the scanning signal line connected with the sub-pixel and the data signal line.

Further, each of the sub-pixels includes an organic material region and a pixel region surrounding the organic material region,

the light-transmitting area is arranged in the pixel area among the sub-pixels, and the orthographic projection of the light-transmitting area on the substrate does not overlap with the orthographic projection of the organic material area on the substrate.

Further, the light-transmitting area is at least one of a circle and a polygon;

the orthographic projection of the light-transmitting area on the substrate is partially overlapped with the orthographic projection of at least two pixel areas on the substrate.

Further, the under-screen image pickup area comprises pixels arranged in an array, and the pixels comprise a plurality of sub-pixels;

the light-transmitting area is arranged between two sub-pixels with the largest pixel distance;

or

The light-transmitting area is arranged at the position with the same distance with each sub-pixel in the pixel.

Further, the light transmissive film comprises at least one of lithium 8-hydroxyquinoline (Liq), N ' -diphenyl-N, N ' -bis (9-phenyl-9H-carbazol-3-yl) -biphenyl-4, 4' -diamine (HT 01), N- (diphenyl-4-yl) -9, 9-dimethyl-N- (4- (9-phenyl-9H-carbazol-3-yl) -phenyl) -9H-fluoren-2-amine (HT 211), 2- (4- (9, 10-bis (naphthalen-2-yl) anthracen-2-yl) phenyl) -1-phenyl-1H-benzo- [ D ] imidazole (LG 201).

Furthermore, the second electrode is a cathode, the display substrate further comprises a color film layer arranged on one side of the second electrode far away from the substrate,

the color film layer in the area of making a video recording under the screen includes: a first color resistor corresponding to the sub-pixels, an opening area corresponding to the transparent area, and a black matrix surrounding the first color resistor and the opening area,

an orthographic projection of the opening area on the substrate falls in an orthographic projection of the light-transmitting area on the substrate.

Further, the black matrix includes a first surface near a side of the substrate and a second surface far from the side of the substrate,

a first opening surrounding the opening area is formed on the first surface, a second opening surrounding the opening area is formed on the second surface,

the orthographic projection area of the first opening on the substrate is smaller than that of the second opening on the substrate, and the orthographic projection area of the second opening on the substrate is smaller than that of the light-transmitting area on the substrate.

Furthermore, the second electrode is a cathode, the display substrate further comprises a color film layer arranged on one side of the second electrode far away from the substrate,

the color film layer in the area of making a video recording under the screen includes: an opening area corresponding to the light-transmitting area, and a second color resistor surrounding the opening area and corresponding to the sub-pixels,

an orthographic projection of the opening area on the substrate falls in an orthographic projection of the light-transmitting area on the substrate.

Further, the second color resist includes a third surface on a side close to the substrate and a fourth surface on a side far from the substrate,

a third opening formed on the third surface to surround the opening area, a fourth opening formed on the fourth surface to surround the opening area,

the orthographic projection area of the third opening on the substrate is smaller than that of the fourth opening on the substrate, and the orthographic projection area of the fourth opening on the substrate is smaller than that of the light-transmitting area on the substrate.

A second aspect of the invention provides an electroluminescent diode display device comprising a display substrate as described in the first aspect.

A third aspect of the present invention provides a method for manufacturing the display substrate according to the first aspect, comprising:

forming a plurality of sub-pixels arranged in an array on a substrate, wherein at least one of the sub-pixels comprises a light-emitting element, the light-emitting element comprises a first electrode and an organic light-emitting layer which are sequentially far away from the substrate, and a light-transmitting area is arranged among the sub-pixels;

forming a light-transmitting film on the formed structure through a mask plate, wherein an orthographic projection of the light-transmitting film on the substrate at least partially overlaps with an orthographic projection of the light-transmitting area on the substrate;

and forming a second electrode of the light-emitting element on the formed structure, wherein the second electrode surrounds the light-transmitting film, and the light transmittance of the light-transmitting film is greater than that of the second electrode.

The invention has the following beneficial effects:

aiming at the existing problems, the invention provides an electroluminescent diode display substrate, a display device and a manufacturing method, wherein the display substrate is provided with a light-transmitting film which is arranged between second electrodes and corresponds to a light-transmitting area, the light-transmitting film is used for patterning the second electrodes, and the second electrodes at the light-transmitting area are removed, so that the poor display caused by the reflection of the second electrodes can be reduced, the problems in the prior art are solved, the display effect of the display substrate is effectively improved, and the electroluminescent diode display substrate has a wide application prospect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a display substrate according to an embodiment of the invention;

fig. 2 is a schematic structural diagram of an off-screen image pickup area of a display substrate according to an embodiment of the present invention;

FIG. 3 shows a flow chart of a method of fabrication according to an embodiment of the invention;

FIGS. 4a-4c are schematic diagrams illustrating stages in the manufacture of a display substrate according to an embodiment of the invention;

FIG. 5 is a schematic top view of a display substrate according to another embodiment of the invention;

FIG. 6 is a schematic top view of a display substrate according to another embodiment of the invention;

FIGS. 7a-7d are schematic diagrams of light transmissive regions of a display substrate according to one embodiment of the invention;

FIGS. 8a-8b are schematic diagrams illustrating the light-transmissive regions of each sub-pixel arrangement of the display substrate according to one embodiment of the present invention;

fig. 9 is a schematic structural view of a display substrate according to another embodiment of the present invention;

FIG. 10 is a schematic view showing each opening area of a display substrate according to another embodiment of the present invention;

fig. 11 is a schematic structural view of a display substrate according to another embodiment of the present invention;

FIG. 12 is a schematic view showing each opening area of a display substrate according to another embodiment of the present invention.

Detailed Description

In order to more clearly illustrate the present invention, the present invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.

It is to be noted that the terms "formed on (8230)", "disposed on (8230)", "formed on (8230)") and "disposed on (8230)", as used herein, may mean that one layer is directly formed or disposed on another layer, or that one layer is indirectly formed or disposed on another layer, that is, another layer is present between two layers. As used herein, unless otherwise noted, the term "in the same layer" means that two layers, components, members, elements or portions may be formed by the same patterning process, and the two layers, components, members, elements or portions are generally formed of the same material. Herein, unless otherwise specified, the expression "patterning process" generally includes the steps of coating of photoresist, exposure, development, etching, stripping of photoresist, and the like. The expression "one-time patterning process" means a process of forming a patterned layer, member, or the like using one mask plate.

In view of the above problem, as shown in fig. 1 and 2, an embodiment of the present invention provides an electroluminescent diode display substrate, including an under-screen image pickup area 10 and a display area 11 at least partially surrounding the under-screen image pickup area, where the under-screen image pickup area 10 includes: a substrate 100; a plurality of sub-pixels arranged in an array on the substrate 100, and a light-transmitting region 101 located between the plurality of sub-pixels, at least one of the plurality of sub-pixels including a light-emitting element including a first electrode 110, an organic light-emitting layer 130, and a second electrode 150, which are sequentially distant from the substrate;

a light-transmitting film 140 located between the second electrodes 150, wherein an orthogonal projection of the light-transmitting film 150 on the substrate 100 at least partially overlaps an orthogonal projection of the light-transmitting region 101 on the substrate 100, and a light transmittance of the light-transmitting film 140 is greater than a light transmittance of the second electrodes 150.

In this embodiment, the display substrate is through setting up the printing opacity membrane that just corresponds with printing opacity district between the second electrode to utilize the printing opacity membrane to carry out the patterning to the second electrode, get rid of the second electrode of printing opacity district position, thereby reduce because of the second electrode reflection leads to show badly, remedied the problem that exists among the prior art, effectively improve display substrate's display effect, have extensive application prospect.

In a specific example, as shown in fig. 3, the detailed description is given by taking the fabrication of a display substrate as an example, and as shown in fig. 4a to 4c, the method includes the following steps:

the method comprises the steps that a plurality of sub-pixels arranged in an array mode are formed on a substrate, at least one sub-pixel in the plurality of sub-pixels comprises a light emitting element, the light emitting element comprises a first electrode and an organic light emitting layer which are sequentially far away from the substrate, and a light transmitting area is formed among the plurality of sub-pixels.

In this embodiment, as shown in fig. 4a, in the under-screen camera area, the first electrode 110 and the pixel defining layer 120 are sequentially formed on the substrate 100, the organic light emitting layer 130 is formed within a range defined by the pixel defining layer 120, that is, a plurality of sub-pixels arranged in an array are formed on the substrate 100, and the under-screen camera area forms a light transmitting area between the sub-pixels according to spatial distribution of each sub-pixel to transmit external ambient light to the under-screen camera, so that the under-screen camera can collect the external ambient light.

Secondly, forming a light-transmitting film on the formed structure through a mask plate, wherein the orthographic projection of the light-transmitting film on the substrate and the orthographic projection of the light-transmitting area on the substrate at least partially overlap

In this embodiment, as shown in fig. 4b, a light transmissive film is formed using a high precision Metal Mask (FMM) according to the position of the light transmissive region, and in particular, a light transmissive film 140 is formed at the position of the light transmissive region 101, the light transmissive film including at least one of 8-hydroxyquinoline lithium (Liq), N ' -diphenyl-N, N ' -bis (9-phenyl-9H-carbazol-3-yl) -biphenyl-4, 4' -diamine (HT 01), N- (diphenyl-4-yl) -9, 9-dimethyl-N- (4- (9-phenyl-9H-carbazol-3-yl) -phenyl) -9H-fluoren-2-amine (HT 211), 2- (4- (9, 10-bis (naphthalene-2-yl) anthracen-2-yl) phenyl) -1-phenyl-1H-benzo- [ D ] imidazole (LG), the light transmissive film having a characteristic of poor adhesion to Mg/Ag material of the second electrode, and a second electrode 201 is further defined by forming the light transmissive film at the light transmissive region.

In view of improving the light transmittance of the light-transmitting region, in an optional embodiment, the light-transmitting films are disposed in one-to-one correspondence with the light-transmitting regions, and the second electrode surrounds the light-transmitting films, and an orthogonal projection of the light-transmitting films on the substrate is located within an orthogonal projection of the light-transmitting regions on the substrate.

In this embodiment, the light-transmitting film in one-to-one correspondence with the light-transmitting region ensures that external environment light is transmitted to the under-screen camera located on the light-emitting side of the display substrate through the light-transmitting film, and ensures that the second electrode formed after the light-transmitting film is formed is not in the light-transmitting region through the characteristic of poor adhesion with the second electrode, thereby further improving the light transmittance.

It should be noted that, considering the thickness of the transparent film and the specific shape formed by the transparent film, the orthographic projection area of the transparent film on the substrate is less than or equal to the orthographic projection area of the transparent area on the substrate, so as to ensure that the external ambient light penetrating through the transparent film is transmitted to the under-screen camera.

And thirdly, forming a second electrode of the light-emitting element on the formed structure, wherein the second electrode surrounds the light-transmitting film, and the light transmittance of the light-transmitting film is greater than that of the second electrode.

In this embodiment, as shown in fig. 4c, based on the second electrode deposited on the light transmissive film disposed in the light transmissive region, since the light transmissive film 140 has a characteristic of poor adhesion to the Mg/Ag material of the second electrode, that is, the second electrode cannot be deposited on the light transmissive film 140, the second electrode is evaporated on the whole layer on the basis of the formation of the light transmissive film 140, and a second electrode pattern surrounding the light transmissive film 140 is formed, that is, the second electrode 150 is patterned by the light transmissive film 140, the second electrode material is removed from the light transmissive region corresponding to the light transmissive film 140, and external ambient light is collected through the light transmissive film, so that transmittance of the light transmissive region is improved, reflection and diffraction caused by the presence of the second electrode in the light transmissive region are reduced, and display effect of the display substrate is effectively improved.

It should be noted that, in the present application, the selection of the light-transmitting area is not specifically limited, and it is considered that a voltage is applied to the second electrode to drive each sub-pixel of the under-screen camera area, that is, the second electrode is an integral layer connecting film layer having an opening, the opening is a light-transmitting film corresponding to the light-transmitting area one to one, and on the basis that the light-transmitting area does not affect the uniform voltage application of the second electrode and drives each sub-pixel to emit light, the larger the light-transmitting area is, the better the light-transmitting effect is, and the more the external ambient light can be collected by the under-screen camera. In addition, the first electrode and the second electrode are not specifically limited in this embodiment, the first electrode in this embodiment is an anode electrode, the second electrode is a cathode electrode, and the cathode electrode and the surrounding light-transmitting film form a second electrode layer, that is, a cathode layer.

The present application does not limit the specific structure of the under-screen image pickup region 10, and in an alternative embodiment, for example, as shown in fig. 5, for example, in a display substrate, the sub-pixels 180 arranged in an array in the under-screen image pickup region 10 of the display substrate form an island-shaped structure, a driving circuit for driving the sub-pixels is formed at a position of the sub-pixels 180 close to the substrate, the driving circuit is respectively connected to the transverse scanning signal line 103 input in the first direction X and the longitudinal data signal line 102 input in the second direction Y, in order to avoid signal routing in the light transmission region to cause reflection, a region surrounded by the sub-pixels 180, the scanning signal line 103 connected to the sub-pixels 180, and the data signal line 102 is formed in the under-screen image pickup region 10 as a light transmission region 101, and a light transmission film 140 is formed at a cathode layer position corresponding to the light transmission region. There is no scanning signal line and no data signal line in the range of the light-transmitting area, that is, the orthographic projection of the light-transmitting film on the substrate and the orthographic projection of the signal wiring on the substrate do not overlap. Because the light-transmitting film 140 has the characteristic of poor adhesion to the Mg/Ag material of the cathode electrode, the cathode electrode is evaporated in a whole layer on the basis of forming the light-transmitting film 140, a cathode electrode pattern surrounding the light-transmitting film 140 is formed, namely, the cathode electrode is patterned by the light-transmitting film 140, the cathode electrode material is removed from the light-transmitting area corresponding to the light-transmitting film 140, and external ambient light is collected through the light-transmitting area, so that the transmittance of the light-transmitting area is improved, the reflection and diffraction caused by the cathode electrode existing in the light-transmitting area are reduced, and the display effect of the display substrate is effectively improved; and this embodiment has that circuit design is simple, and signal interference is little, and the printing opacity district shape is easily controlled, the characteristics of easy volume production.

It should be noted that, in the present application, the first direction and the second direction are not specifically limited, and the first direction and the second direction are arranged in a crossed manner, and the first direction X and the second direction Y are in a perpendicular relationship in this embodiment, and a person skilled in the art should set the first direction and the second direction according to the actual application requirement, and details are not described herein again.

The present application does not limit a specific structure of the under-screen image capturing region 10, and in an optional embodiment, for example, the display substrate is as shown in fig. 6, the sub-pixels 180 arranged in an array of the under-screen image capturing region 10 of the display substrate adopt a structure in which pixels are separated from a driving circuit to improve transmittance and reduce diffraction, specifically, the under-screen image capturing region 10 only includes a plurality of sub-pixels 180 arranged in an array, the driving circuit for driving each sub-pixel 180 is disposed outside the under-screen image capturing region 10, for example, the driving circuit 170 is disposed in a driving circuit layer of the display region, the driving circuit 170 connects corresponding sub-pixels in the under-screen image capturing region 10 through signal traces to drive the sub-pixels to emit light, and the driving circuit 170' of each sub-pixel in the display region are disposed in parallel, which does not affect light transmittance performance of the under-screen image capturing region. Meanwhile, as the driving circuit is not arranged in the under-screen image pickup area, the driving circuit layer of the under-screen image pickup area adopts transparent metal oxide such as indium tin oxide or thin transparent metal Ag or transparent graphene as a light-transmitting film layer, thereby being further beneficial to light transmission. On the basis of the under-screen image pickup area of the embodiment, in the manufacturing process of the cathode layer, a light-transmitting film is formed at a position corresponding to a light-transmitting area which is formed in the under-screen image pickup area by utilizing a mask plate and does not comprise the sub-pixel 180 and the signal wiring, no signal wiring exists in the range of the light-transmitting area, namely, the orthographic projection of the light-transmitting film on the substrate is not overlapped with the orthographic projection of the signal wiring on the substrate. Because the light-transmitting film 140 has the characteristic of poor adhesion to the Mg/Ag material of the cathode electrode, the cathode electrode is evaporated in a whole layer on the basis of forming the light-transmitting film 140, a cathode electrode pattern surrounding the light-transmitting film 140 is formed, namely, the cathode electrode is patterned by the light-transmitting film 140, the cathode electrode material is removed in the light-transmitting area corresponding to the light-transmitting film 140, and external ambient light is collected through the light-transmitting area, so that the transmittance of the light-transmitting area is effectively improved, reflection and diffraction caused by the cathode electrode existing in the light-transmitting area are reduced, and the display effect of the display substrate is effectively improved.

In an alternative embodiment, as shown in fig. 4c, the sub-pixels include an organic material region 105 and a pixel region 104 surrounding the organic material region 105,

the light-transmitting region 101 is disposed in the pixel region 104 between the sub-pixels, and an orthogonal projection of the light-transmitting region 101 on the substrate 100 does not overlap an orthogonal projection of the organic material region 105 on the substrate 100.

In the present embodiment, a light-transmitting region for transmitting external ambient light is selected between the pixel regions 104 of the respective sub-pixels according to the spatial distribution of the organic material region of the respective sub-pixels. For example, different light-transmitting regions are provided as shown in fig. 7a-7 d.

Specifically, as shown in fig. 7a, a schematic pixel arrangement diagram of the under-screen image capture area is shown, where the under-screen image capture area includes a sub-pixel 1301, a sub-pixel 1302, and a sub-pixel 1303, for example, red, blue, and green, respectively, the sub-pixel includes an organic material area 105 and a pixel area 104, a light-transmitting area in this embodiment is disposed at a position where a distance between adjacent at least two sub-pixels is farthest, for example, a distance between organic material areas of adjacent two sub-pixels 1303 is d1, a distance between adjacent sub-pixels 1302 and sub-pixels 1303 is d2, a circular light-transmitting area (not shown) is disposed between adjacent three sub-pixels or adjacent four sub-pixels, a light-transmitting film 140 is disposed at a position of the light-transmitting area corresponding to the cathode layer, and the light-transmitting film 140 covers a part of the pixel areas of at least two sub-pixels; then, a cathode electrode is evaporated in a whole layer on the basis of forming the light-transmitting film 140, and a cathode electrode pattern surrounding the light-transmitting film 140 is formed, that is, the position of each light-transmitting area is not covered with a cathode electrode, so that the transmittance of the light-transmitting area is effectively improved, the reflection and diffraction caused by the cathode electrode existing in the light-transmitting area are reduced, and the display effect of the display substrate is effectively improved.

Similarly, as shown in fig. 7b, a schematic pixel arrangement diagram of the under-screen image pickup region is shown, a rectangular light-transmitting region is arranged at a position between the sub-pixel 1301, the sub-pixel 1302 and the sub-pixel 1303, where the distance between the sub-pixels is the largest, and the light-transmitting film 140 is arranged at a cathode layer position corresponding to the light-transmitting region, so that the light-transmitting film 140 covers part of the pixel regions of at least two sub-pixels, thereby avoiding arranging a cathode electrode in the light-transmitting region, effectively improving the transmittance of the light-transmitting region, reducing reflection and diffraction caused by the cathode electrode existing in the light-transmitting region, and effectively improving the display effect of the display substrate.

Similarly, as shown in fig. 7c and 7d, as a schematic diagram of pixel arrangement of the under-screen image capture area, between the sub-pixel 1301, the sub-pixel 1302, and the sub-pixel 1303, a strip-shaped light-transmitting area is set between two adjacent sub-pixels including the edge position of the shared pixel, and the light-transmitting film 140 is set at the cathode layer position corresponding to the light-transmitting area, so that the light-transmitting film 140 covers part of the pixel area of at least two sub-pixels, thereby avoiding setting a cathode electrode in the light-transmitting area, effectively improving the transmittance of the light-transmitting area, reducing reflection and diffraction caused by the cathode electrode existing in the light-transmitting area, and effectively improving the display effect of the display substrate.

It should be noted that, in the present application, the position, shape, and number of the transparent regions are not specifically limited, and those skilled in the art should select an appropriate transparent region according to the actual application requirement to implement the design rule of disposing the transparent film at the position of the cathode layer corresponding to the transparent region and eliminating the cathode electrode within the transparent region, which is not described herein again.

In consideration of different pixel arrangements, in an alternative embodiment, as shown in fig. 8a, a schematic diagram of a pixel arrangement of an under-screen image capture area is shown, where each pixel includes four sub-pixels, the shape and area of each sub-pixel are set according to the light emitting brightness of each sub-pixel, and the sub-pixels include a red sub-pixel 1301, a blue sub-pixel 1302, and two green sub-pixels 1303, and as can be seen, a light transmission area is disposed between two adjacent pixels, and a light transmission film 140 is disposed at a position of a cathode layer corresponding to the light transmission area.

In this embodiment, a light-transmitting region is disposed between two adjacent pixels, for example, between two sub-pixels with the farthest distance between the pixels, so that external ambient light is collected by the light-transmitting region without covering the cathode electrode under the condition of normal display of the image pickup region under the screen, thereby improving the light transmittance of the light-transmitting region.

Similarly, as shown in fig. 8b, a schematic diagram of the pixel arrangement of another under-screen image pickup region, namely, a delta RGB arrangement, in this pixel arrangement mode, three sub-pixels 1301, 1302 and 1303 of each pixel form a pixel cluster, and in each pixel cluster, a light-transmitting region is disposed at a position having the same distance from each sub-pixel.

In this embodiment, in the pixel mode arranged in delta RGB, by providing a light transmission region inside each pixel, external ambient light is collected using the light transmission region not covering the cathode electrode under normal display of the image pickup region under the screen, thereby improving light transmittance of the light transmission region.

In view of integrating the color film layer into the display substrate, in an alternative embodiment, as shown in fig. 9, the display substrate 10 further includes a color film layer 190 disposed on a side of the cathode layer away from the substrate 100, where the color film layer 190 of the under-screen camera area includes: the pixel structure comprises first color resists 192/193 which are in one-to-one correspondence with the sub-pixels, opening areas 194 which are in one-to-one correspondence with the light-transmitting areas 101, and black matrixes 191 which surround the first color resists 192/193 and the opening areas 194, wherein the orthographic projection of the opening areas 194 on the substrate 100 is in the orthographic projection of the light-transmitting areas 101 on the substrate 100, namely the orthographic projection area of the opening areas 194 on the substrate 100 is smaller than or equal to the orthographic projection area of the light-transmitting areas 101 on the substrate 100.

In this embodiment, combine color film layer COE technique (color filter on encapsulation), keep away from substrate one side at display substrates's cathode layer and set up color film layer, color film layer includes the color resistance and encircles the black matrix of color resistance, the printing opacity district of the district of making a video recording under the screen is considered to be used for gathering external environment light, position department that corresponds the printing opacity district at black matrix sets up corresponding opening district, display substrates transmits environment light to the camera under the screen that is located display substrates below through the opening district of color film layer and the printing opacity membrane of the cathode layer that corresponds, thereby realize making a video recording under the screen.

Still taking the fabrication of the display substrate as an example, as shown in fig. 9:

fourthly, a color film layer 190 is disposed on a side of the cathode layer away from the substrate 100, wherein the color film layer 190 includes first color resists 192/193 corresponding to the sub-pixels, opening areas 194 corresponding to the light-transmitting areas 101, and black matrixes 191 surrounding the first color resists 192/193 and the opening areas 194.

In the present embodiment, the planarization layer 160 is formed on the cathode electrode 150 and the light transmissive film 140; forming an encapsulation layer protecting the electroluminescent diode on the planarization layer 160; and forming a black matrix on the packaging layer, wherein the black matrix comprises openings of the color resistors and opening areas corresponding to the light-transmitting areas. Specifically, the color resistance openings are used for setting color resistance corresponding to the organic light emitting layers of the sub-pixels, for example, a blue color resistance corresponding to the blue sub-pixel, a red color resistance corresponding to the red sub-pixel, and a green color resistance corresponding to the green sub-pixel; the opening area and the light-transmitting area are correspondingly arranged, specifically, the size of the opening area is consistent with that of the light-transmitting area, so that external light is transmitted to a camera below the display substrate, namely a camera below the screen on one side of the display substrate away from the color film layer through the opening area on the color film layer and the light-transmitting film of the cathode layer; the display substrate of this embodiment gets rid of the cathode electrode that covers on the printing opacity district through the printing opacity membrane, can effectively improve the transmissivity of printing opacity district, reduce because of there is reflection and diffraction that the cathode electrode arouses in the printing opacity district, further improves the transmissivity in printing opacity district through the opening area that sets up on the various rete simultaneously, effectively improves display substrate's display effect.

In view of the thickness and the formation topography of the black matrix, in an alternative embodiment, the black matrix includes a first surface near one side of the substrate and a second surface far from one side of the substrate, a first opening surrounding the opening area is formed on the first surface, a second opening surrounding the opening area is formed on the second surface, an orthographic projection area of the first opening on the substrate is smaller than an orthographic projection area of the second opening on the substrate, and an orthographic projection area of the second opening on the substrate is smaller than an orthographic projection area of the light-transmitting area on the substrate.

In this embodiment, in consideration of the absorption effect of the black matrix on the internal light, the areas of the upper and lower openings of the black matrix are further defined while ensuring the correspondence between the black matrix opening area and the light transmission area. Specifically, as shown in fig. 10, the black matrix 191 includes a first surface 1911 and a second surface 1912, and as shown in a cross-sectional view of the black matrix perpendicular to the substrate, the cross-section of the black matrix is trapezoidal, the first surface 1911 has a first opening L2, the second surface has a second opening L4, the opening of the cathode electrode 150 is L3, and the opening of the light-transmissive film is L1. In consideration of the film thickness and the film morphology of the light-transmitting film, the size of the opening L1 of the light-transmitting film is equal to or smaller than the size of the cathode opening L3, and in this embodiment, the size of the cathode opening L3 is the same as the size of the opening L1 of the light-transmitting film. In order to ensure the absorption effect of the black matrix on the internal light, the area of the orthographic projection of the first opening L2 of the first surface 1911 of the black matrix on the substrate is the smallest, that is, the opening area of the first opening is the smallest, the area of the orthographic projection of the second opening L4 of the second surface 1912 of the black matrix on the substrate is larger than the opening area of the first opening, the area of the orthographic projection of the cathode opening L3 and the opening L1 of the light-transmitting film on the substrate is the largest, that is, the edge of the black matrix covers or at least partially covers the opening of the light-transmitting film, that is, the edge of the black matrix overlaps the edge of the cathode electrode, for example, the overlapping portion is less than or equal to 10um, the reflection effect of the cathode electrode on the light-transmitting area is reduced, the interference of the internal light is reduced, the performance of the lower camera and the display effect of the lower camera are effectively improved on the display substrate on the basis of further improving the light transmittance of the display substrate.

In view of further improving the light transmission characteristic of the color film layer in the under-screen image capture area, in an alternative embodiment, as shown in fig. 11, the display substrate 10 further includes a color film layer 190 disposed on a side of the cathode layer away from the substrate 100, where the color film layer 190 in the under-screen image capture area includes: an opening region 194 corresponding to the light-transmitting region 101, and a second color resist 192/193 surrounding the opening region 194 and corresponding to the sub-pixels, wherein the orthographic projection of the opening region 194 on the substrate is in the orthographic projection of the light-transmitting region 101 on the substrate.

In this embodiment, in order to further simplify the structure of the under-screen image capture area, the color film layer in the under-screen image capture area is not provided with a black matrix any more, and the opening between the color resistors is used as the opening area corresponding to the light-transmitting area, in other words, the color resistors are used as the black matrix to limit the opening area, that is, in the under-screen image capture area, the openings of the color film layer outside the color resistors are all light-transmitting opening areas, and can be used for collecting external ambient light. Specifically, the size of the opening area defined by the color resistance is consistent with that of the light-transmitting area, so that external light is transmitted to the under-screen camera arranged below the display substrate, namely the side of the display substrate far away from the color film layer through the opening area on the color film layer and the light-transmitting film of the cathode layer; the display substrate of this embodiment gets rid of the cathode electrode that covers on the printing opacity district through the printing opacity membrane, can effectively improve the transmissivity of printing opacity district, reduce because of there is reflection and diffraction that the cathode electrode arouses in the printing opacity district, further improves the transmissivity in printing opacity district through the opening area that sets up on the various rete simultaneously, effectively improves display substrate's display effect.

In view of the thickness and the formation topography of the color resist layer, in an alternative embodiment, the second color resist includes a third surface near the substrate side and a fourth surface far from the substrate side, a third opening is formed on the third surface and surrounds the opening area, an orthographic projection area of the third opening on the substrate is smaller than that of the fourth opening on the substrate, and an orthographic projection area of the fourth opening on the substrate is smaller than that of the light-transmitting area on the substrate.

In this embodiment, in consideration of the absorption effect of the color resist layer on the internal light of a color different from the color resist color, the areas of the upper opening and the lower opening of the color resist layer are further defined while ensuring the correspondence between the opening area of the color resist layer and the light transmission area. Specifically, as shown in fig. 12, the color resist layer 192 includes a third surface 1921 and a fourth surface 1922, which is a cross-sectional view of the color resist layer perpendicular to the substrate, the cross-section of the color resist layer is trapezoidal, the third surface 1921 has a third opening L2, the fourth surface has a fourth opening L4, the opening of the cathode 150 is L3, and the opening of the light-transmitting film is L1. In consideration of the film thickness and the film morphology of the light-transmitting film, the size of the opening L1 of the light-transmitting film is equal to or smaller than the size of the cathode opening L3, and in this embodiment, the size of the cathode opening L3 is the same as the size of the opening L1 of the light-transmitting film. To ensure the absorption of the internal light by the color resist, the area of the orthographic projection of the third opening L2 of the third surface 1921 of the color resist on the substrate is the smallest, that is, the opening area of the third opening is the smallest, the area of the orthographic projection of the fourth opening L4 of the second surface 1922 of the color resist on the substrate is larger than the opening area of the third opening, the area of the orthographic projection of the cathode opening L3 and the opening L1 of the light transmissive film on the substrate is the largest, that is, the edge of the color resist covers or at least partially covers the opening of the light transmissive film, that is, the edge of the color resist overlaps the edge of the cathode electrode, for example, the overlapping portion is 10um or less, the light transmissive film that ensures the transmission of the external ambient light to the cathode layer through the fourth opening and the third opening area of the color resist and transmits the external ambient light to the under-screen camera disposed under the display substrate through the light transmissive film, and the internal light emitted to the edge of the color resist is absorbed, and the reflection effect of the under-screen is improved on the display substrate.

Corresponding to the electroluminescent diode display substrate provided in the foregoing embodiment, an embodiment of the present application further provides a manufacturing method for manufacturing the electroluminescent diode display substrate, as shown in fig. 3, including:

forming a plurality of sub-pixels arranged in an array on a substrate, wherein at least one of the sub-pixels comprises a light-emitting element, the light-emitting element comprises a first electrode and an organic light-emitting layer which are sequentially far away from the substrate, and a light-transmitting area is arranged among the sub-pixels;

forming a light-transmitting film on the formed structure through a mask plate, wherein an orthographic projection of the light-transmitting film on the substrate at least partially overlaps with an orthographic projection of the light-transmitting area on the substrate;

and forming a second electrode of the light-emitting element on the formed structure, wherein the second electrode surrounds the light-transmitting film, and the light transmittance of the light-transmitting film is greater than that of the second electrode.

In this embodiment, display substrate is through setting up the printing opacity membrane that just corresponds with printing opacity district between the second electrode to utilize the printing opacity membrane to carry out the patterning to the second electrode, get rid of the second electrode of printing opacity district position, thereby reduce because of the second electrode reflection leads to show badly, compensatied the problem that exists among the prior art, effectively improve display substrate's display effect, have extensive application prospect. Since the manufacturing method provided by the embodiments of the present application corresponds to the electroluminescent diode display substrate provided by the above-mentioned several embodiments, the foregoing embodiments are also applicable to the manufacturing method provided by the present embodiment, and will not be described in detail in the present embodiment.

Based on the above electroluminescent diode display substrate, another embodiment of the invention provides a display device, which includes the above electroluminescent diode display substrate, and the display device is an electroluminescent diode display device. The display device can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame or a navigator.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.

Claims (14)

1. An electroluminescent diode display substrate comprising a sub-screen image capture area and a display area at least partially surrounding the sub-screen image capture area, the sub-screen image capture area comprising:

a substrate;

the array substrate comprises a plurality of sub-pixels arranged in an array mode and a light-transmitting area located between the sub-pixels, wherein the sub-pixels are arranged on the substrate, at least one of the sub-pixels comprises a light-emitting element, and the light-emitting element comprises a first electrode, an organic light-emitting layer and a second electrode which are sequentially far away from the substrate;

the light-transmitting film is positioned between the second electrodes, the orthographic projection of the light-transmitting film on the substrate is at least partially overlapped with the orthographic projection of the light-transmitting area on the substrate, and the light transmittance of the light-transmitting film is greater than that of the second electrodes.

2. The display substrate of claim 1, wherein the light transmissive films are disposed in one-to-one correspondence with the light transmissive regions, and wherein the second electrode surrounds the light transmissive films, and wherein an orthographic projection of the light transmissive films on the substrate is located within an orthographic projection of the light transmissive regions on the substrate.

3. The display substrate according to claim 1, wherein the under-screen image capture area includes signal traces connected to the sub-pixels, and an orthogonal projection of the light-transmissive film on the substrate does not overlap an orthogonal projection of the signal traces on the substrate.

4. The display substrate according to claim 3, wherein the under-screen image pickup region includes a driving circuit layer disposed on the substrate, the driving circuit layer includes driving circuits for driving the sub-pixels, respectively, the signal traces include scanning signal lines connected to the driving circuits and extending in a first direction, and data signal lines connected to the driving circuits and extending in a second direction crossing the first direction,

the light-transmitting area is an area surrounded by the sub-pixel, the scanning signal line connected with the sub-pixel and the data signal line.

5. The display substrate of claim 1, wherein each sub-pixel comprises an organic material region and a pixel region surrounding the organic material region,

the light-transmitting area is arranged in the pixel area among the sub-pixels, and the orthographic projection of the light-transmitting area on the substrate does not overlap with the orthographic projection of the organic material area on the substrate.

6. The display substrate according to claim 5, wherein the light-transmitting area is at least one of the circular shape and the polygonal shape;

the orthographic projection of the light-transmitting area on the substrate is partially overlapped with the orthographic projection of at least two pixel areas on the substrate.

7. The display substrate according to claim 1, wherein the under-screen image pickup region comprises pixels arranged in an array, the pixels comprising a plurality of sub-pixels;

the light-transmitting area is arranged between two sub-pixels with the largest pixel distance;

or

The light-transmitting area is arranged at the position with the same distance with each sub-pixel in the pixel.

8. The display substrate according to any one of claims 1 to 7, wherein the light transmissive film comprises at least one of lithium 8-hydroxyquinoline (Liq), N ' -diphenyl-N, N ' -bis (9-phenyl-9H-carbazol-3-yl) -biphenyl-4, 4' -diamine (HT 01), N- (diphenyl-4-yl) -9, 9-dimethyl-N- (4- (9-phenyl-9H-carbazol-3-yl) -phenyl) -9H-fluoren-2-amine (HT 211), 2- (4- (9, 10-bis (naphthalen-2-yl) anthracen-2-yl) phenyl) -1-phenyl-1H-benzo- [ D ] imidazole (LG 201).

9. The display substrate of claim 1, wherein the second electrode is a cathode, the display substrate further comprising a color film layer disposed on a side of the second electrode away from the substrate,

the color film layer in the area of making a video recording under the screen includes: first color resistors in one-to-one correspondence with the sub-pixels, opening areas in one-to-one correspondence with the light transmission areas, and black matrices surrounding the first color resistors and the opening areas,

an orthographic projection of the opening area on the substrate falls in an orthographic projection of the light-transmitting area on the substrate.

10. The display substrate according to claim 9, wherein the black matrix includes a first surface on a side close to the substrate and a second surface on a side far from the substrate,

a first opening formed on the first surface to surround the opening area, a second opening formed on the second surface to surround the opening area,

the orthographic projection area of the first opening on the substrate is smaller than that of the second opening on the substrate, and the orthographic projection area of the second opening on the substrate is smaller than that of the light-transmitting area on the substrate.

11. The display substrate of claim 1, wherein the second electrode is a cathode, the display substrate further comprising a color film layer disposed on a side of the second electrode away from the substrate,

the color film layer in the area of making a video recording under the screen includes: an opening area corresponding to the light-transmitting area, and a second color resistor surrounding the opening area and corresponding to the sub-pixels,

an orthographic projection of the opening area on the substrate falls in an orthographic projection of the light-transmitting area on the substrate.

12. The display substrate of claim 11, wherein the second color resists comprise a third surface near the substrate side and a fourth surface far from the substrate side,

a third opening formed on the third surface to surround the opening area, a fourth opening formed on the fourth surface to surround the opening area,

the orthographic projection area of the third opening on the substrate is smaller than that of the fourth opening on the substrate, and the orthographic projection area of the fourth opening on the substrate is smaller than that of the light-transmitting area on the substrate.

13. An electroluminescent diode display device comprising the display substrate according to any one of claims 1 to 12.

14. A method of manufacturing a display substrate according to any one of claims 1 to 12, comprising:

forming a plurality of sub-pixels arranged in an array on a substrate, wherein at least one of the sub-pixels comprises a light-emitting element, the light-emitting element comprises a first electrode and an organic light-emitting layer which are sequentially far away from the substrate, and a light-transmitting area is arranged among the sub-pixels;

forming a light-transmitting film on the formed structure through a mask plate, wherein an orthographic projection of the light-transmitting film on the substrate at least partially overlaps with an orthographic projection of the light-transmitting area on the substrate;

and forming a second electrode of the light-emitting element on the formed structure, wherein the second electrode surrounds the light-transmitting film, and the light transmittance of the light-transmitting film is greater than that of the second electrode.

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