CN113948662A

CN113948662A - Display substrate and display device

Info

Publication number: CN113948662A
Application number: CN202111211677.6A
Authority: CN
Inventors: 栾梦雨; 彭裕清; 韩君奇
Original assignee: BOE Technology Group Co Ltd; Hefei Xinsheng Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Hefei Xinsheng Optoelectronics Technology Co Ltd
Priority date: 2021-10-18
Filing date: 2021-10-18
Publication date: 2022-01-18

Abstract

The embodiment of the disclosure discloses a display substrate and a display device, relates to the technical field of display, and is used for improving the display brightness of the display substrate. The display substrate includes: the display device comprises a substrate and a plurality of sub-pixels positioned on one side of the substrate. The plurality of sub-pixels includes at least: a plurality of first color sub-pixels and a plurality of second color sub-pixels. The sub-pixel includes: a light emitting device. The light emitting device includes: an anode, a light emitting section, and a cathode are stacked. Wherein the thickness of the cathode of the first color sub-pixel is different from the thickness of the cathode of the second color sub-pixel. The cathode of the first color sub-pixel is configured to enhance the microcavity effect of the first color sub-pixel. The cathode of the second color sub-pixel is configured to enhance the microcavity effect of the second color sub-pixel. The display substrate and the display device provided by the embodiment of the disclosure are used for image display.

Description

Display substrate and display device

Technical Field

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

Background

Organic Light Emitting Diodes (OLEDs) have been widely used in the display field because of their advantages of self-luminescence, low driving voltage, high luminous efficiency, fast response speed, flexible display, etc.

Disclosure of Invention

In one aspect, a display substrate is provided, the display substrate including: the display device comprises a substrate and a plurality of sub-pixels positioned on one side of the substrate. The plurality of sub-pixels includes at least: a plurality of first color sub-pixels and a plurality of second color sub-pixels. The sub-pixel includes: a light emitting device. The light emitting device includes: an anode, a light emitting section, and a cathode are stacked. Wherein the thickness of the cathode of the first color sub-pixel is different from the thickness of the cathode of the second color sub-pixel. The cathode of the first color sub-pixel is configured to enhance the microcavity effect of the first color sub-pixel. The cathode of the second color sub-pixel is configured to enhance the microcavity effect of the second color sub-pixel.

According to the display substrate provided by some embodiments of the present disclosure, by making the thickness of the cathode of the first color sub-pixel and the thickness of the cathode of the second color sub-pixel different, the cavity length of the resonant cavity of the first color sub-pixel and the cavity length of the resonant cavity of the second color sub-pixel may be made different, and then by controlling the cavity length of the first color sub-pixel to match the wavelength of the first color light emitted by the first color sub-pixel and controlling the cavity length of the second color sub-pixel to match the wavelength of the first color light emitted by the second color sub-pixel, the microcavity effects of the first color sub-pixel and the second color sub-pixel may be simultaneously improved, and then the light emission amounts of the first color light and the second color light may be simultaneously improved, and the display luminance of the display substrate may be improved.

In some embodiments, the cathode of the first color sub-pixel comprises: a first sub-cathode. The cathode of the second color sub-pixel comprises: and the second sub-cathode and the third sub-cathode are arranged in a stacked manner. Wherein one of the second sub-cathode and the third sub-cathode is disposed in the same layer as the first sub-cathode.

In some embodiments, in a case where the second sub-cathode is disposed on the same layer as the first sub-cathode, an orthogonal projection of the third sub-cathode on the substrate and an orthogonal projection of the light emitting portion of the first color sub-pixel on the substrate do not overlap. In a case where the third sub-cathode is provided in the same layer as the first sub-cathode, an orthogonal projection of the second sub-cathode on the substrate and an orthogonal projection of the light emitting portion of the first color sub-pixel on the substrate do not overlap.

In some embodiments, the first color sub-pixel is configured to emit a first color light and the second color sub-pixel is configured to emit a second color light. The first color light and the second color light include: any two of red, green, and blue light.

In some embodiments, where the first color light is blue light, the thickness X of the cathode of the first color sub-pixel satisfies the formula:

wherein N1 is a natural number.

In some embodiments, where the second color light is green, the thickness Y of the cathode of the second color sub-pixel satisfies the formula:

in the case that the second color light is red light, the thickness Y of the cathode of the second color sub-pixel satisfies the formula:

wherein, N2 and N3 are both natural numbers.

In some embodiments, where the first color light is green, the thickness X of the cathode of the first color sub-pixel satisfies the formula:

wherein N4 is a natural number.

In some embodiments, where the second color light is blue light, the thickness Y of the cathode of the second color sub-pixel satisfies the formula:

wherein N5 is a positive integer, N6 is a natural number, and N5>N4。

In some embodiments, where the first color light is red light, the thickness X of the cathode of the first color sub-pixel satisfies the formula:

wherein N7 is a natural number.

in the case where the second color light is green light, the thickness Y of the cathode of the second color sub-pixel satisfies the formula:

wherein N8 and N9 are both positive integers, and N8>N7，N9>N7。

In some embodiments, the plurality of sub-pixels further comprises: a plurality of third color sub-pixels. The cathode of the third color sub-pixel comprises: and a fourth sub-cathode. Wherein the fourth sub-cathode and the first sub-cathode are arranged in the same layer.

In some embodiments, the cathode of the third color sub-pixel further comprises: and the fifth sub-cathode is arranged on one side of the fourth sub-cathode. The other of the second sub-cathode and the third sub-cathode is disposed in the same layer as the fifth sub-cathode.

In some embodiments, the display substrate has a light-emitting display region and a transparent display region that are contiguous. The plurality of sub-pixels are located in the light emitting display area. The portion of the display substrate located in the transparent display area is configured such that light from one side of the display substrate passes through the portion of the display substrate located in the transparent display area and is incident on the other side of the display substrate.

In some embodiments, the display substrate further comprises a plurality of auxiliary light emitting devices positioned in the transparent display area. The auxiliary light emitting device includes: an auxiliary anode, an auxiliary light emitting part, and an auxiliary cathode. The auxiliary anode is made of a transparent material.

In some embodiments, one of the second sub-cathode and the third sub-cathode is disposed at the same layer as the auxiliary cathode.

In some embodiments, the sub-pixel further comprises a pixel driving circuit electrically connected to the light emitting device. The display substrate further includes an auxiliary pixel driving circuit electrically connected to the auxiliary light emitting device. The pixel driving circuit and the auxiliary pixel driving circuit are both located in the light emitting display area.

In another aspect, there is provided a display device including: such as some of the embodiments described above.

The display substrate included in the display device provided in some embodiments of the present disclosure has the same structure and beneficial effects as the display substrate provided in some embodiments described above, and details are not repeated here.

Drawings

In order to more clearly illustrate the technical solutions in the present disclosure, the drawings needed to be used in some embodiments of the present disclosure will be briefly described below, and it is apparent that the drawings in the following description are only drawings of some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art according to the drawings. Furthermore, the drawings in the following description may be regarded as schematic and are not intended to limit the actual size of products to which embodiments of the disclosure relate.

FIG. 1 is a block diagram of a display substrate according to some embodiments of the present disclosure;

FIG. 2 is a cross-sectional view of the display substrate of FIG. 1 taken along the direction A-A';

FIG. 3 is another cross-sectional view of the display substrate of FIG. 1 taken along the direction A-A';

FIG. 4 is a block diagram of another display substrate in accordance with some embodiments of the present disclosure;

FIG. 5 is a cross-sectional view of the display substrate shown in FIG. 4 taken along the direction B-B';

FIG. 6 is another cross-sectional view of the display substrate shown in FIG. 4 taken along the direction B-B';

FIG. 7 is a further cross-sectional view of the display substrate shown in FIG. 4 taken along the direction B-B';

FIG. 8 is a block diagram of yet another display substrate in accordance with some embodiments of the present disclosure;

FIG. 9 is a cross-sectional view of the display substrate shown in FIG. 8 taken along the direction C-C';

FIG. 10 is another cross-sectional view of the display substrate shown in FIG. 8 taken along the direction C-C';

FIG. 11 is a block diagram of yet another display substrate in accordance with some embodiments of the present disclosure;

FIG. 12 is a cross-sectional view of the display substrate shown in FIG. 11 taken along the direction D-D';

FIG. 13 is another cross-sectional view of the display substrate shown in FIG. 11 taken along the direction D-D';

FIG. 14 is a block diagram of a display device in accordance with some embodiments of the present disclosure.

Detailed Description

Technical solutions in some embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings, 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 provided by the present disclosure belong to the protection scope of the present disclosure.

Unless the context requires otherwise, throughout the specification and claims, the word "comprise", and other forms thereof, such as the third person's singular form "comprising" and the present participle form "comprising", are to be construed in an open, inclusive sense, i.e. as "including, but not limited to". In the description herein, the terms "one embodiment," "some embodiments," "example," "particular example" or "some examples" or the like are intended to indicate that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the disclosure. The schematic representations of the above terms are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be included in any suitable manner in any one or more embodiments or examples.

In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present disclosure, "a plurality" means two or more unless otherwise specified.

In describing some embodiments, the expression "connected" and its derivatives may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more elements are in direct physical or electrical contact with each other. The embodiments disclosed herein are not necessarily limited to the contents herein.

"at least one of A, B and C" has the same meaning as "A, B or at least one of C," each including the following combination of A, B and C: a alone, B alone, C alone, a and B in combination, a and C in combination, B and C in combination, and A, B and C in combination.

"A and/or B" includes the following three combinations: a alone, B alone, and a combination of A and B.

The use of "adapted to" or "configured to" herein is meant to be an open and inclusive language that does not exclude devices adapted to or configured to perform additional tasks or steps.

Additionally, the use of "based on" means open and inclusive, as a process, step, calculation, or other action that is "based on" one or more stated conditions or values may in practice be based on additional conditions or values beyond those stated.

As used herein, "about" or "approximately" includes the stated values as well as average values within an acceptable deviation range for the particular value, as determined by one of ordinary skill in the art in view of the measurement in question and the error associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

Example embodiments are described herein with reference to cross-sectional and/or plan views as idealized example figures. In the drawings, the thickness of layers and regions are exaggerated for clarity. Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, the exemplary embodiments should not be construed as limited to the shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of the exemplary embodiments.

Some embodiments of the present disclosure provide a display substrate 100, as shown in fig. 1, the display substrate 100 including: a substrate 10 and a plurality of sub-pixels 20 located at one side of the substrate 10. The plurality of sub-pixels 20 includes at least: a plurality of first color sub-pixels 20a and a plurality of second color sub-pixels 20 b.

The structure of the substrate 10 includes various structures, and can be selected and arranged according to actual needs.

For example, the substrate 10 may be a rigid substrate. The rigid substrate may be, for example, a glass substrate or a PMMA (Polymethyl methacrylate) substrate. In this case, the display substrate 100 may be a rigid display substrate.

As another example, the substrate 10 may be a flexible substrate. The flexible substrate may be, for example, a PET (Polyethylene terephthalate) substrate, a PEN (Polyethylene naphthalate) substrate, or a PI (Polyimide) substrate. In this case, the display substrate 100 may be a flexible display substrate.

In some examples, as shown in fig. 2, the sub-pixel 20 includes: a light emitting device 21. The light emitting device 21 may be, for example, an OLED.

Illustratively, the light emitting device 21 includes: an anode 211, a light emitting section 212, and a cathode 213 are stacked.

Of course, the light emitting device 21 may further include: at least one of a hole injection layer, a hole transport layer, and an electron blocking layer between the anode 211 and the light emitting part 212, and at least one of an electron injection layer, an electron transport layer, and a hole blocking layer between the cathode 213 and the light emitting part 212 of the light emitting device 21. This can improve the light emission efficiency of the light emitting device 21.

Illustratively, the material of the anode 211 is a fully reflective material.

Illustratively, the materials of cathode 213 include: semi-transparent and semi-reflective materials and/or transparent materials.

In practical applications, the transparent material is understood to be a material having a high transmittance and a low reflectance, and the transparent material does not have a transmittance of 100% for a while, which is limited to the technology. Further, a transflective material does not mean that light has a transmittance of 50% and a reflectance of 50% when passing through the material, and it is understood that light is transmitted and reflected when passing through the material. Therefore, when the material of cathode 213 is a transparent material, cathode 213 can also be a film having a certain reflection function.

In the case where the material of the anode 211 is a total reflection material, the anode 211 may serve as a total reflection film. In the case where the material of the cathode 213 is a transflective material and/or a transparent material, the cathode 213 may serve as a transflective film. At this time, the anode 211 and the cathode 213 may form a resonant cavity.

When the light emitting portion 212 of the light emitting device 21 is located in the resonant cavity, and the cavity length of the resonant cavity and the wavelength of the light emitted by the light emitting portion 212 satisfy a certain relationship, the light is selectively enhanced, and the spectrum is narrowed, which may be referred to as a microcavity effect. The above-mentioned cavity length refers to a distance between the light-emitting portion 212 (for example, the geometric center of the light-emitting portion 212) and the surface of the cathode 213 on the side away from the substrate 10.

Therefore, by controlling the cavity length to match the wavelength of a certain color of light, the color of light can be selectively enhanced, the spectrum can be narrowed, and the light output of the color of light can be increased.

Whereas the size of the cavity length can be varied by controlling the thickness of the cathode 213 with a constant spacing between the geometric center of the light-emitting portion 212 and the surface of the cathode 213 on the side close to the substrate 10.

In some examples, as shown in fig. 2, the thickness h1 of the cathode 213 of the first color sub-pixel 20a and the thickness h2 of the cathode 213 of the second color sub-pixel 20b are different. The cathode 213 of the first color sub-pixel 20a is configured to enhance the microcavity effect of the first color sub-pixel 20 a. The cathode 213 of the second color sub-pixel 20b is configured to enhance the microcavity effect of the second color sub-pixel 20 b.

Since the thickness h1 of the cathode 213 of the first-color sub-pixel 20a and the thickness h2 of the cathode 213 of the second-color sub-pixel 20b are different, the distance between the geometric center of the light-emitting portion 212 of the first-color sub-pixel 20a and the surface of the cathode 213 of the first-color sub-pixel 20a on the side close to the substrate 10 is different from the distance between the geometric center of the light-emitting portion 212 of the second-color sub-pixel 20b and the surface of the cathode 213 of the second-color sub-pixel 20b on the side close to the substrate 10, so that the cavity length of the resonant cavity of the first-color sub-pixel 20a and the cavity length of the resonant cavity of the second-color sub-pixel 20b can be made different, that is, the cavity length of the resonant cavity of the first-color sub-pixel 20a and the cavity length of the resonant cavity of the second-color sub-pixel 20b can be matched to the wavelengths of the different color lights.

Furthermore, by controlling the cavity length of the first color sub-pixel 20a to match the wavelength of the first color light emitted by the first color sub-pixel 20a, the microcavity effect of the first color sub-pixel 20a can be improved, so that the light emitting amount of the first color light is increased, and further, the power consumption can be reduced and the display brightness of the display substrate 100 can be improved. By controlling the cavity length of the second color sub-pixel 20b to match the wavelength of the first color light emitted by the second color sub-pixel 20b, the microcavity effect of the second color sub-pixel 20b can be improved, so that the light emission amount of the second color light is increased, and further, the power consumption can be reduced and the display brightness of the display substrate 100 can be improved.

Therefore, according to the display substrate 100 provided by some embodiments of the present disclosure, by making the thickness h1 of the cathode 213 of the first color sub-pixel 20a and the thickness h2 of the cathode 213 of the second color sub-pixel 20b different, the cavity length of the resonant cavity of the first color sub-pixel 20a and the cavity length of the resonant cavity of the second color sub-pixel 20b can be made different, and further by controlling the cavity length of the first color sub-pixel 20a to match the wavelength of the first color light emitted by the first color sub-pixel 20a and controlling the cavity length of the second color sub-pixel 20b to match the wavelength of the first color light emitted by the second color sub-pixel 20b, the microcavity effect of the first color sub-pixel 20a and the second color sub-pixel 20b can be simultaneously increased, and further by simultaneously increasing the light emission amounts of the first color light and the second color light, the display luminance of the display substrate 100 can be increased.

The structure of the cathode 213 of the first color sub-pixel 20a and the structure of the cathode 213 of the second color sub-pixel 20b may be different.

In some examples, as shown in fig. 2 and 3, the cathode 213 of the first color sub-pixel 20a includes: the first sub-cathode 213 a. The cathode 213 of the second color sub-pixel 20b includes: and a second sub-cathode 213b and a third sub-cathode 213c are stacked. One of the second sub-cathode 213b and the third sub-cathode 213c is disposed in the same layer as the first sub-cathode 213 a.

Note that "the same layer" referred to herein means a layer structure formed by forming a film layer for forming a specific pattern by the same film formation process and then performing a patterning process once using the same mask plate. Depending on the specific pattern, the single patterning process may include multiple exposure, development or etching processes, or may include an evaporation process, and the specific pattern in the formed layer structure may be continuous or discontinuous, and the specific patterns may be at different heights or have different thicknesses. Thus, the second sub-cathode 213b and the first sub-cathode 213a may be formed simultaneously in one patterning process, or the third sub-cathode 213c and the first sub-cathode 213a may be formed simultaneously in one patterning process, which is advantageous to simplify the manufacturing process of the display substrate 100.

Illustratively, as shown in fig. 2, the second sub-cathode 213b is located between the substrate 10 and the third sub-cathode 213 c.

Illustratively, as shown in fig. 2, the second sub-cathode 213b is disposed in the same layer as the first sub-cathode 213 a.

Thus, the second sub-cathode 213b and the first sub-cathode 213a can be formed simultaneously in one patterning process, which is advantageous for simplifying the manufacturing process of the display substrate 100.

For example, the second sub-cathode 213b may have the same thickness as the first sub-cathode 213 a.

For example, as shown in fig. 2, the second sub-cathode 213b and the first sub-cathode 213a may be formed in a single body.

For example, as shown in fig. 2, the second sub-cathode 213b and the first sub-cathode 213a are continuous and have a planar shape as a whole.

Illustratively, as shown in fig. 2, the orthographic projection of the third sub-cathode 213c on the substrate 10 and the orthographic projection of the light-emitting portion 212 of the first color sub-pixel 20a on the substrate 10 do not overlap.

Thus, the position of the third sub-cathode 213c and the position of the first color sub-pixel 20a are shifted, so that the third sub-cathode 213c is prevented from affecting the thickness of the cathode 213 of the first color sub-pixel 20a, and further, the microcavity effect of the first sub-cathode 213a on the first color sub-pixel 20a is prevented from being improved.

For example, in the process of forming the third sub-cathode 213c, a mask may be disposed on the sides of the second sub-cathode 213b and the first sub-cathode 213a away from the substrate 10, at least the portion of the first color sub-pixel 20a corresponding to the light-emitting portion 212 thereof is blocked by the mask, and then the third sub-cathode 213c is formed by evaporation, so that the orthographic projection of the formed third sub-cathode 213c on the substrate 10 and the orthographic projection of the light-emitting portion 212 of the first color sub-pixel 20a on the substrate 10 may not overlap.

Illustratively, as shown in fig. 3, the third sub-cathode 213c is disposed in the same layer as the first sub-cathode 213 a.

Thus, the third sub-cathode 213c and the first sub-cathode 213a can be formed simultaneously in one patterning process, which is advantageous for simplifying the manufacturing process of the display substrate 100.

For example, the third sub-cathode 213c may have the same thickness as the first sub-cathode 213 a.

Illustratively, as shown in fig. 3, the third sub-cathode 213c and the first sub-cathode 213a may be in an integral structure.

For example, as shown in fig. 3, the third sub-cathode 213c and the first sub-cathode 213a are continuous and have a planar shape as a whole.

Illustratively, as shown in fig. 3, the orthographic projection of the second sub-cathode 213b on the substrate 10 and the orthographic projection of the light-emitting portion 212 of the first color sub-pixel 20a on the substrate 10 do not overlap.

Thus, the position of the second sub-cathode 213b and the position of the first color sub-pixel 20a are shifted, so that the second sub-cathode 213b is prevented from affecting the thickness of the cathode 213 of the first color sub-pixel 20a, and further the microcavity effect of the first sub-cathode 213a on the first color sub-pixel 20a is prevented from being improved.

For example, in the process of forming the second sub-cathode 213b, a mask may be disposed on the sides of the third sub-cathode 213c and the first sub-cathode 213a away from the substrate 10, at least the portion of the first color sub-pixel 20a corresponding to the light-emitting portion 212 thereof is blocked by the mask, and then the second sub-cathode 213b is formed by evaporation, so that the orthographic projection of the formed second sub-cathode 213b on the substrate 10 and the orthographic projection of the light-emitting portion 212 of the first color sub-pixel 20a on the substrate 10 may not overlap.

The first color light and the second color light are not limited in the present disclosure, and can be selectively set according to actual needs.

In some examples, the first and second color lights include: any two of red, green, and blue light.

Illustratively, the first color light is red light and the second color light is blue light.

Illustratively, the first color light is red light and the second color light is green light.

Illustratively, the first color light is blue light and the second color light is red light.

Illustratively, the first color light is blue light and the second color light is green light.

Illustratively, the first color light is green light and the second color light is red light.

Illustratively, the first color light is green light and the second color light is blue light.

It will be appreciated by those skilled in the art that when the cavity length of the resonant cavity is used to match a color of light, there are multiple optimum values for the cavity length, each of which can achieve the best microcavity effect for that color of light. Furthermore, according to the theory associated with microcavity effects, the multiple optimum values of the cavity length for achieving the optimum microcavity effect for a certain color of light are typically periodic.

Thus, particularly in the present disclosure, it will be apparent to those skilled in the art that the plurality of optimal values of the cavity length for achieving the optimal microcavity effect for the first color sub-pixel 20a or the second color sub-pixel 20b have periodicity, and accordingly, the thickness of the cathode 213 has a plurality of optimal values at this time, and the plurality of optimal values have periodicity.

The following description is schematically made by taking an example in which the second sub-cathode 213b and the first sub-cathode 213a are disposed in the same layer.

In some examples, where the first color light is blue light, the thickness X of the cathode 213 of the first color sub-pixel 20a satisfies formula (1):

wherein N1 is a natural number.

Expressed as: the minimum thickness of the cathode 213 of the first color sub-pixel 20a in the case where the first color sub-pixel 20a achieves the optimal microcavity effect.

Expressed as: in the first color sub-pixel 20aBy the next best microcavity effect, the cathode 213 of the first color sub-pixel 20a needs to have an increased thickness.

It is understood that, in this case, the thickness of the first sub-cathode 213a and the thickness of the second sub-cathode 213b both satisfy the above formula (1).

Illustratively, in the case where the second color light is green light, the thickness Y of the cathode 213 of the second color sub-pixel 20b satisfies formula (2):

wherein N2 is a natural number.

Expressed as: the minimum thickness of the cathode 213 of the second color sub-pixel 20b in the case where the second color sub-pixel 20b achieves the optimal microcavity effect.

Expressed as: the cathode 213 of the second color sub-pixel 20b needs to have an increased thickness when the second color sub-pixel 20b reaches the next optimal microcavity effect.

This allows the first color sub-pixel 20a and the second color sub-pixel 20b to achieve the optimal microcavity effect, thereby increasing the amount of blue light and green light emitted.

The above examples are described in more detail below in several specific cases.

For example, when N1-N2-0, the cathode 213 of the first color sub-pixel 20a has a thickness of

The cathode 213 of the second color sub-pixel 20b has a thickness of

This not only ensures that the first color sub-pixel 20a and the second color sub-pixel 20b in the display substrate 100 achieve the best microcavity effect, but also ensures that the cathode of the sub-pixel 20 has the maximum thickness

Smaller, it also ensures better transmittance of the sub-pixel 20.

It is understood that, in this case, the thickness of the first sub-cathode 213a and the thickness of the second sub-cathode 213b are both

The thickness of the third sub-cathode 213c is

When the temperature is constant, the sheet resistance R of the material satisfies the formula:

wherein ρ represents resistivity, is a physical quantity for representing the resistance characteristic of the material, and is a constant value; d represents the thickness of the material. That is, at a given temperature, the resistance of a material is inversely proportional to the thickness.

Specifically in the present disclosure, the larger the thickness of the cathode 213 is, the smaller the sheet resistance of the cathode 213 is, without changing the temperature, so that the voltage required to drive the light emitting device 21 to emit light can be reduced.

For example, when N1 is 0 and N2 is 1, the cathode 213 of the first color sub-pixel 20a has a thickness of

The cathode 213 of the second color sub-pixel 20b has a thickness of

Larger, it also ensures that the cathode of the sub-pixel 20 has a lower sheet resistance.

The thickness of the third sub-cathode 213c is

For example, when N1 is N2 is 1, the cathode 213 of the first color sub-pixel 20a has a thickness of

The cathode 213 of the second color sub-pixel 20b has a thickness of

The thickness of the third sub-cathode 213c is

Of course, N1 and N2 may take other values, and may be specifically selected and set according to actual needs, which are not illustrated herein.

Illustratively, in the case where the second color light is red lightNext, the thickness Y of the cathode 213 of the second color sub-pixel 20b satisfies formula (3):

wherein N3 is a natural number.

Expressed as: the increased thickness of the cathode 213 of the second color sub-pixel 20b is required in case the second color sub-pixel 20b reaches the next best microcavity effect. Thus, the first color sub-pixel 20a and the second color sub-pixel 20b can achieve the optimal microcavity effect at the same time, thereby increasing the light output of the blue light and the red light.

For example, when N1-N3-0, the cathode 213 of the first color sub-pixel 20a has a thickness of

The cathode 213 of the second color sub-pixel 20b has a thickness of

Smaller, it also ensures better transmittance of the sub-pixel 20.

The thickness of the third sub-cathode 213c is

For example, when N1 is 0 and N3 is 1, the cathode 213 of the first color sub-pixel 20a has a thickness of

The cathode 213 of the second color sub-pixel 20b has a thickness of

The thickness of the third sub-cathode 213c is

For example, when N1 is N3 is 1, the cathode 213 of the first color sub-pixel 20a has a thickness of

The cathode 213 of the second color sub-pixel 20b has a thickness of

This not only ensures that the first color sub-pixel 20a and the second color sub-pixel 20b in the display substrate 100 achieve the best microcavity effect, but also ensures that the sub-pixels 20 have the best microcavity effectMaximum thickness of cathode

The thickness of the third sub-cathode 213c is

Of course, N1 and N3 may take other values, and may be specifically selected and set according to actual needs, which are not illustrated herein.

In other examples, where the first color light is green, the thickness X of the cathode 213 of the first color sub-pixel 20a satisfies formula (4):

wherein N4 is a natural number.

It is understood that, in this case, the thickness of the first sub-cathode 213a and the thickness of the second sub-cathode 213b satisfy the above formula (4).

Illustratively, in the case where the second color light is blue light, the thickness Y of the cathode 213 of the second color sub-pixel 20b satisfies formula (5):

wherein N5 is a positive integer, and N5>N4。

Expressed as: the increased thickness of the cathode 213 of the second color sub-pixel 20b is required in case the second color sub-pixel 20b reaches the next best microcavity effect.

For example, when N4 is 0 and N5 is 1, the cathode 213 of the first color sub-pixel 20a has a thickness of

The cathode 213 of the second color sub-pixel 20b has a thickness of

The thickness of the third sub-cathode 213c is

For example, when N4 is 1 and N5 is 2, the cathode 213 of the first color sub-pixel 20a has a thickness of

The cathode 213 of the second color sub-pixel 20b has a thickness of

The thickness of the third sub-cathode 213c is

Of course, N4 and N5 may take other values, and may be specifically selected and set according to actual needs, which are not illustrated herein.

Illustratively, in the case where the second color light is red light, the thickness Y of the cathode 213 of the second color sub-pixel 20b satisfies formula (6):

wherein N6 is a natural number.

This allows the first color sub-pixel 20a and the second color sub-pixel 20b to achieve the optimal microcavity effect, thereby increasing the light output of green light and red light.

For example, when N4-N6-0, the cathode 213 of the first color sub-pixel 20a has a thickness of

The cathode 213 of the second color sub-pixel 20b has a thickness of

Smaller, it also ensures better transmittance of the sub-pixel 20.

The thickness of the third sub-cathode 213c is

For example, when N4 is 0 and N6 is 1, the cathode 213 of the first color sub-pixel 20a has a thickness of

The cathode 213 of the second color sub-pixel 20b has a thickness of

The thickness of the third sub-cathode 213c is

For example, when N4 is N6 is 1, the cathode 213 of the first color sub-pixel 20a has a thickness of

The cathode 213 of the second color sub-pixel 20b has a thickness of

The thickness of the third sub-cathode 213c is

Of course, N4 and N6 may take other values, and may be specifically selected and set according to actual needs, which are not illustrated herein.

In addition toIn some examples, where the first color light is red, the thickness X of the cathode 213 of the first color sub-pixel 20a satisfies formula (7):

wherein N7 is a natural number.

Expressed as: in the case where the first color sub-pixel 20a achieves the next best microcavity effect, the cathode 213 of the first color sub-pixel 20a needs to have an increased thickness.

It is understood that, in this case, the thickness of the first sub-cathode 213a and the thickness of the second sub-cathode 213b satisfy the above formula (7).

Illustratively, in the case where the second color light is blue light, the thickness Y of the cathode 213 of the second color sub-pixel 20b satisfies formula (8):

wherein N8 is a positive integer, and N8>N7。

Thus, the first color sub-pixel 20a and the second color sub-pixel 20b can achieve the optimal microcavity effect at the same time, thereby increasing the light output of the blue light and the red light.

For example, when N7 is 0 and N8 is 1, the cathode 213 of the first color sub-pixel 20a has a thickness of

The cathode 213 of the second color sub-pixel 20b has a thickness of

The thickness of the third sub-cathode 213c is

For example, when N7 is 1 and N8 is 2, the cathode 213 of the first color sub-pixel 20a has a thickness of

The cathode 213 of the second color sub-pixel 20b has a thickness of

This not only ensures that the first color sub-pixel 20a and the second color sub-pixel 20b in the display substrate 100 achieve the best microcavity effect, but also ensures that the maximum cathode thickness of the sub-pixel 20

The thickness of the third sub-cathode 213c is

Of course, N7 and N8 may take other values, and may be specifically selected and set according to actual needs, which are not illustrated herein.

Illustratively, in the case where the second color light is green light, the thickness Y of the cathode 213 of the second color sub-pixel 20b satisfies formula (9):

wherein N9 is a positive integer, and N9>N7。

For example, when N7 is 0 and N9 is 1, the first isThe cathode 213 of the color sub-pixel 20a has a thickness of

The cathode 213 of the second color sub-pixel 20b has a thickness of

The thickness of the third sub-cathode 213c is

For example, when N7 is 1 and N9 is 2, the cathode 213 of the first color sub-pixel 20a has a thickness of

The cathode 213 of the second color sub-pixel 20b has a thickness of

It will be appreciated that in this case, the first sub-cathode213a and the second sub-cathode 213b are both thick

The thickness of the third sub-cathode 213c is

Of course, N7 and N9 may take other values, and may be specifically selected and set according to actual needs, which are not illustrated herein.

Finally, when the cathode has a large thickness, the resistance of the cathode can be reduced well, but the influence on the transmittance of the cathode may be large, so that the influence on the microcavity effect, the resistance of the cathode, the transmittance, and the like needs to be comprehensively considered and the thickness of the cathode needs to be selected appropriately according to actual needs.

In some examples, as shown in fig. 4, the plurality of sub-pixels 20 further includes: a plurality of third color sub-pixels 20 c. As shown in fig. 5, the cathode 213 of the third color sub-pixel 20c includes: and a fourth sub-cathode 213 d. Wherein the fourth sub-cathode 213d and the first sub-cathode 213a are disposed in the same layer.

Thus, the fourth sub-cathode 213d and the first sub-cathode 213a can be simultaneously formed in one patterning process, which is advantageous for simplifying the manufacturing process of the display substrate 100.

Illustratively, in the case where the second sub-cathode 213b is disposed on the same layer as the first sub-cathode 213a, the orthographic projection of the third sub-cathode 213c on the substrate 10 and the orthographic projection of the light-emitting portion 212 of the third color sub-pixel 20c on the substrate 10 do not overlap.

Illustratively, in the case where the third sub-cathode 213c is disposed on the same layer as the first sub-cathode 213a, the orthographic projection of the second sub-cathode 213b on the substrate 10 and the orthographic projection of the light-emitting portion 212 of the third color sub-pixel 20c on the substrate 10 do not overlap.

The color of the light emitted by the third color sub-pixel 20c is not limited in the present disclosure, and may be selectively set according to actual needs.

Illustratively, the third color sub-pixel 20c is configured to emit a third color light. The first color light and the second color light include: in the case of any two of red light, green light, and blue light, the third color light includes another one of red light, green light, and blue light.

For example, in the case where the first color light is red light, the second color light is blue light, or the first color light is blue light, the second color light is red light, the third color light is green light.

For example, in the case where the first color light is red light, the second color light is green light, or the first color light is green light, the second color light is red light, the third color light is blue light.

For example, in the case where the first color light is blue light, the second color light is green light, or the first color light is green light, the second color light is blue light, the third color light is red light.

In the case where the fourth sub-cathode 213d and the first sub-cathode 213a are provided in the same layer, the thickness of the fourth sub-cathode 213d and the thickness of the first sub-cathode 213a may be the same. Thus, based on the description in some of the above examples, in the case where the thickness of the first sub-cathode 213a is small, the thickness of the fourth sub-cathode 213d is also small, so that the fourth sub-cathode 213d can have a good transmittance, thereby improving the transmittance of the third color light.

In some examples, as shown in fig. 6 and 7, the cathode 213 of the third color sub-pixel 20c further includes: and a fifth sub-cathode 213e disposed at one side of the fourth sub-cathode 213 d. The other of the second sub-cathode 213b and the third sub-cathode 213c is disposed in the same layer as the fifth sub-cathode 213 e.

Thus, the second sub-cathode 213b and the fifth sub-cathode 213e can be formed simultaneously in one patterning process, or the third sub-cathode 213c and the fifth sub-cathode 213e can be formed simultaneously in one patterning process, which is beneficial to simplifying the manufacturing process of the display substrate 100, and the thickness of the cathode 213 of the third color sub-pixel 20c can be increased, so that the cathode 213 of the third color sub-pixel 20c has a lower sheet resistance, thereby reducing the voltage required for driving the third color sub-pixel 20c to emit light.

For example, as shown in fig. 6, in the case where the first sub-cathode 213a and the second sub-cathode 213b are disposed in the same layer, the fifth sub-cathode 213e and the third sub-cathode 213c are disposed in the same layer.

For example, as shown in fig. 7, in the case where the first sub-cathode 213a and the third sub-cathode 213c are disposed in the same layer, the fifth sub-cathode 213e and the second sub-cathode 213b are disposed in the same layer.

In some examples, as shown in fig. 8, the display substrate 100 has a light-emitting display region S and a transparent display region T adjacent to each other, and the plurality of sub-pixels 20 are located in the light-emitting display region S. The portion of the display substrate 100 located in the transparent display region T is configured such that light from one side of the display substrate 100 passes through the portion of the display substrate 100 located in the transparent display region T and is incident on the other side of the display substrate 100. The display substrate 100 can thus realize a transparent display.

Illustratively, as shown in fig. 8, the display substrate 100 includes a plurality of pixel units.

For example, the plurality of pixel units may be arranged in an array, that is, include a plurality of rows of pixel units and a plurality of columns of pixel units.

It should be noted that the layout manner of the sub-pixels 20 disposed in the light-emitting display area S is not limited in the present disclosure, and the layout may be selected according to actual needs.

For example, in one pixel unit, at least one first color sub-pixel 20a, one second color sub-pixel 20b and one third color sub-pixel 20c are included.

Illustratively, the display substrate 100 includes a transparent region (a region excluding the plurality of sub-pixels 20 and the traces) including a main transparent region and a sub-transparent region. The traces include, for example, gate lines, data lines, and the like.

For example, as shown in fig. 8, the main transparent area is the transparent display area T described above. The transparent display area T is positioned between any two adjacent columns of pixel units.

It is understood that in the case where the transparent display region T includes the auxiliary light emitting device 21 ', the auxiliary light emitting device 21' is located within the main transparent region.

For example, as shown in fig. 8, the sub transparent region is located between any two adjacent sub pixels 20 in the plurality of sub pixels 20 included in any one column of pixel units.

For example, as shown in fig. 9, in the case where the third sub-cathode 213c and the fifth sub-cathode 213d are disposed in the same layer, the cathode 213 disposed in the same layer may extend to the transparent display region T, so that the resistance of the cathode 213 as a whole may be reduced.

For example, as shown in fig. 10, in the case where the second sub-cathode 213b and the fifth sub-cathode 213d are disposed in the same layer, the cathode 213 disposed in the same layer may extend to the transparent display region T, so that the resistance of the cathode 213 as a whole may be reduced.

Illustratively, as shown in fig. 11, the display substrate 100 further includes a plurality of auxiliary light emitting devices 21' disposed in the transparent display region T. The auxiliary light emitting device 21' includes: an auxiliary anode 211 ', an auxiliary light emitting part 212 ', and an auxiliary cathode 213 '. The material of the auxiliary anode 211' is a transparent material.

Thus, the plurality of auxiliary light emitting devices 21' positioned in the transparent display region T may be used for auxiliary light emission, thereby improving the light emission luminance of the display substrate 100. Also, in the case where the auxiliary light emitting device 21 'does not operate, since the anode 211' of the auxiliary light emitting device is a transparent material, it is possible to avoid an influence on the transmittance of the transparent display region T.

The color of the light emitted by the auxiliary light emitting device 21' is not limited in the present disclosure, and can be selectively set according to actual needs.

For example, in the case where the first color light is red light, the second color light is blue light, or the first color light is blue light, and the second color light is red light, the light emitted by the auxiliary light emitting device 21' is green light. This makes it possible to supplement the light output amount of green light with the auxiliary light emitting device 21'.

For example, in the case where the first color light is red light, the second color light is green light, or the first color light is green light, and the second color light is red light, the light emitted by the auxiliary light emitting device 21' is blue light. This makes it possible to supplement the light output of blue light with the auxiliary light emitting device 21'.

For example, in the case where the first color light is blue light, the second color light is green light, or the first color light is green light, and the second color light is blue light, the light emitted by the auxiliary light emitting device 21' is red light. This makes it possible to supplement the light output amount of red light with the auxiliary light emitting device 21'.

The present disclosure is not limited to the arrangement of the auxiliary cathode 213', and the arrangement may be selected according to actual needs.

Illustratively, one of the second sub-cathode 213b and the third sub-cathode 213c is disposed at the same layer as the auxiliary cathode 213'.

The third color sub-pixel 20c includes a fifth sub-cathode 213e, and the fifth sub-cathode 213e and the third sub-cathode 213c are disposed in the same layer, and the second sub-cathode 213b and the first sub-cathode 213a are also disposed in the same layer.

For example, as shown in fig. 13, the auxiliary cathode 213' may be disposed in the same layer as the second sub-cathode 213 b.

At this time, the first sub-cathode 213a, the second sub-cathode 213b, the fourth sub-cathode 213d, and the auxiliary cathode 213' may serve as a whole cathode, so that the process may be simplified.

For example, as shown in fig. 12, the auxiliary cathode 213' may be disposed in the same layer as the third sub-cathode 213 c.

Illustratively, as shown in fig. 12 and 13, the sub-pixel 20 further includes a pixel driving circuit 22 electrically connected to the light emitting device 21. The display substrate 100 further includes an auxiliary pixel driving circuit 22 'electrically connected to the auxiliary light emitting device 21'. The pixel driving circuit 22 and the auxiliary pixel driving circuit 22' are both located in the light emitting display region S.

For example, the pixel driving circuit 22 may be electrically connected to the anode 211 of the light emitting device 21, thereby controlling the light emitting device 21 to emit light.

For example, the auxiliary pixel driving circuit 22 'may be electrically connected to the anode 211' of the auxiliary light emitting device 21 'to control the auxiliary light emitting device 21' to emit light.

Thus, the pixel driving circuit 22 can independently control the light emitting device 21 to emit light, the auxiliary pixel driving circuit 22 ' can independently control the auxiliary light emitting device 21 ' to emit light, and the pixel driving circuit 22 and the auxiliary pixel driving circuit 22 ' are both located in the light emitting display area S, so that the influence on the transmittance of the transparent display area T can be avoided.

In some embodiments, as shown in fig. 14, a display device 1000 is provided, the display device 1000 comprising the display substrate 100 according to any one of the above examples.

The display device 1000 includes the display substrate 100 having the same structure and advantages as the display substrate 100 provided in some examples, and since some examples have already described the structure and advantages of the display substrate 100 in detail, the description is omitted here.

In some examples, as shown in fig. 14, display device 1000 may be any device that displays text or images, whether in motion (e.g., video) or stationary (e.g., still images). More particularly, it is contemplated that the embodiments may be implemented in or associated with a variety of electronic devices such as, but not limited to, mobile telephones, wireless devices, Personal Digital Assistants (PDAs), hand-held or portable computers, Global Positioning System (GPS) receivers/navigators, cameras, motion Picture Experts Group (MP 4) video players, video cameras, game consoles, wrist watches, clocks, calculators, television monitors, computer monitors, automobile displays (e.g., odometer display, etc.), navigators, cockpit controls and/or displays, displays of camera views (e.g., displays of rear view cameras in vehicles), electronic photographs, electronic billboards or signs, video game consoles, and the like, Projectors, architectural structures, packaging, and aesthetic structures (e.g., displays of images for a piece of jewelry), and the like.

The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any person skilled in the art will appreciate that changes or substitutions within the technical scope of the present disclosure are included in the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A display substrate, comprising: the display device comprises a substrate and a plurality of sub-pixels positioned on one side of the substrate; the plurality of sub-pixels includes at least: a plurality of first color sub-pixels and a plurality of second color sub-pixels;

the sub-pixel includes: a light emitting device; the light emitting device includes: an anode, a light emitting portion, and a cathode which are stacked;

wherein the thickness of the cathode of the first color sub-pixel and the thickness of the cathode of the second color sub-pixel are different;

the cathode of the first color sub-pixel is configured to increase the microcavity effect of the first color sub-pixel;

the cathode of the second color sub-pixel is configured to enhance the microcavity effect of the second color sub-pixel.

2. The display substrate of claim 1, wherein the cathode of the first color sub-pixel comprises: a first sub-cathode;

the cathode of the second color sub-pixel comprises: the second sub-cathode and the third sub-cathode are arranged in a stacked mode;

wherein one of the second sub-cathode and the third sub-cathode is disposed in the same layer as the first sub-cathode.

3. The display substrate according to claim 2, wherein, in a case where the second sub-cathode is disposed on the same layer as the first sub-cathode, there is no overlap between an orthogonal projection of the third sub-cathode on the substrate and an orthogonal projection of the light emitting portion of the first color sub-pixel on the substrate;

in a case where the third sub-cathode is provided in the same layer as the first sub-cathode, an orthogonal projection of the second sub-cathode on the substrate and an orthogonal projection of the light emitting portion of the first color sub-pixel on the substrate do not overlap.

4. The display substrate of claim 1, wherein the first color sub-pixel is configured to emit a first color light and the second color sub-pixel is configured to emit a second color light;

the first color light and the second color light include: any two of red, green, and blue light.

5. The display substrate of claim 4, wherein the thickness X of the cathode of the first color sub-pixel satisfies the formula:

wherein N1 is a natural number.

6. The display substrate according to claim 5, wherein in the case where the second color light is green light, the thickness Y of the cathode of the second color sub-pixel satisfies the formula:

wherein, N2 and N3 are both natural numbers.

7. The display substrate of claim 4, wherein the thickness X of the cathode of the first color sub-pixel satisfies the formula:

wherein N4 is a natural number.

8. The display substrate of claim 7, wherein the thickness Y of the cathode of the second color sub-pixel satisfies the formula when the second color light is blue light:

wherein N5 is a positive integer, N6 is a natural number, and N5> N4.

9. The display substrate of claim 4, wherein the thickness X of the cathode of the first color sub-pixel satisfies the formula:

wherein N7 is a natural number.

10. The display substrate of claim 9, wherein the thickness Y of the cathode of the second color sub-pixel satisfies the formula when the second color light is blue light:

wherein N8 and N9 are both positive integers, and N8> N7, N9> N7.

11. The display substrate of claim 2, wherein the plurality of sub-pixels further comprises: a plurality of third color sub-pixels; the cathode of the third color sub-pixel comprises: a fourth sub-cathode;

wherein the fourth sub-cathode and the first sub-cathode are arranged in the same layer.

12. The display substrate of claim 11, wherein the cathode of the third color sub-pixel further comprises: a fifth sub-cathode disposed at one side of the fourth sub-cathode;

the other of the second sub-cathode and the third sub-cathode is disposed in the same layer as the fifth sub-cathode.

13. The display substrate according to any one of claims 2 to 12, wherein the display substrate has a light-emitting display region and a transparent display region which are adjacent to each other;

the plurality of sub-pixels are positioned in the light-emitting display area;

the portion of the display substrate located in the transparent display area is configured such that light from one side of the display substrate passes through the portion of the display substrate located in the transparent display area and is incident on the other side of the display substrate.

14. The display substrate of claim 13, further comprising a plurality of auxiliary light emitting devices in the transparent display area;

the auxiliary light emitting device includes: an auxiliary anode, an auxiliary light emitting portion, and an auxiliary cathode;

the auxiliary anode is made of a transparent material.

15. The display substrate of claim 14, wherein one of the second sub-cathode and the third sub-cathode is disposed on the same layer as the auxiliary cathode.

16. The display substrate according to claim 14, wherein the sub-pixel further comprises a pixel driving circuit electrically connected to the light emitting device;

the display substrate further comprises an auxiliary pixel driving circuit electrically connected with the auxiliary light emitting device;

the pixel driving circuit and the auxiliary pixel driving circuit are both located in the light emitting display area.

17. A display device, characterized in that the display device comprises: a display substrate according to any one of claims 1 to 16.