Display substrate and display device

Abstract

The utility model provides a display substrate and a display device. The display substrate comprises a substrate and a pixel unit. The pixel unit is located on one side of the substrate. Each pixel unit comprises a first electrode, a light-emitting functional layer and a second electrode. The first electrode is positioned on one side of the substrate; the light-emitting functional layer is located on the side, away from the substrate, of the first electrode. The second electrode is located on one side of the light-emitting functional layer away from the first electrode. The first electrode, the light-emitting functional layer and the second electrode form an optical microcavity. One pixel unit comprises a plurality of light-emitting areas, and for the plurality of light-emitting areas of the same pixel unit, the cavity length of the optical microcavity has a plurality of different values, so that the problems of brightness attenuation and color cast caused by the change of a visual angle are solved.

Description

Technical Field

[0001] The utility model relates to the field of display technology, and in particular to a display substrate and a display device. Background Art

[0002] Organic Light Emitting Diode (OLED) display devices have the characteristics of self-luminescence, fast response speed, wide viewing angle, high definition, high brightness, flexibility and low power consumption, and are increasingly used in the field of display technology.

[0003] During the pixel design process, traditional OLED display devices mainly consider the display effect within the normal viewing angle range. When the viewing angle changes, for example when viewing from a wide angle such as side view, there are problems of excessive brightness attenuation and color deviation, which affect the display effect at a wide viewing angle. Utility Model Content

[0004] The utility model provides a display substrate and a display device, which are used to overcome the problems of brightness attenuation and color shift caused by viewing angle changes.

[0005] In a first aspect of the present invention, a display substrate is provided, comprising:

[0006] substrate;

[0007] A pixel unit is located on one side of the substrate; each pixel unit includes:

[0008] a first electrode, located on one side of the substrate;

[0009] a light-emitting functional layer, located on a side of the first electrode facing away from the substrate;

[0010] a second electrode, located on a side of the light-emitting functional layer facing away from the first electrode;

[0011] The first electrode, the light-emitting functional layer and the second electrode form an optical microcavity; a pixel unit includes multiple light-emitting areas, and for the multiple light-emitting areas of the same pixel unit, the cavity length of the optical microcavity has multiple different values.

[0012] In some embodiments, the display substrate further comprises:

[0013] The pixel defining layer is located on one side of the substrate; the pixel defining layer is provided with a pixel opening; the pixel unit is located in the pixel opening;

[0014] A raised structure is located in the pixel opening; the raised structure includes a side surface inclined relative to the substrate, an end of the side surface close to the substrate is a bottom end of the raised structure, and an inner angle formed by the side surface and the substrate is an acute angle;

[0015] The first electrode, the light-emitting functional layer and the second electrode all cover the side surfaces of the protruding structures, and cover the area between the bottom ends of adjacent protruding structures.

[0016] In some embodiments, the thicknesses of the first electrode, the light-emitting functional layer, and the second electrode corresponding to the region between the bottom ends of adjacent protruding structures are respectively greater than the thicknesses of the first electrode, the light-emitting functional layer, and the second electrode corresponding to the side surfaces.

[0017] In some embodiments, the thickness of the light-emitting functional layer corresponding to the region between the bottom ends of adjacent protrusion structures and the thickness of the light-emitting functional layer corresponding to the side surfaces satisfy:

[0018] T2 = T1 × cosα;

[0019] Wherein, T1 represents the thickness of the light-emitting functional layer corresponding to the region between the bottom ends of adjacent protruding structures, T2 represents the thickness of the light-emitting functional layer corresponding to the side surface, and α represents the angle between the side surface and the inner side of the substrate.

[0020] In some embodiments, a plurality of protrusion structures are disposed within the same pixel opening;

[0021] The three-dimensional shape and size of the protrusion structures within the same pixel opening are the same;

[0022] Among the multiple protrusion structures arranged along any direction in the same pixel opening, the distance between the bottom ends of any two adjacent protrusion structures is the same.

[0023] In some embodiments, a plurality of protrusion structures are disposed within the same pixel opening;

[0024] In the same pixel opening, the inner angle formed by the side surface of the protruding structure and the substrate has multiple different values.

[0025] In some embodiments, for at least one protrusion structure disposed within the same pixel opening, at multiple positions around the protrusion structure, an inner angle formed between the side surface of the protrusion structure and the substrate has multiple different values ​​corresponding to the multiple positions.

[0026] In some embodiments, for multiple protrusion structures arranged in the same pixel opening, the value of the inner angle formed by the side surface of any protrusion structure and the substrate at a set position is different from the value of the inner angle formed by the side surface of at least one other protrusion structure and the substrate at a corresponding position.

[0027] In some embodiments, for the multiple protrusion structures disposed in the same pixel opening, at least two protrusion structures have different heights.

[0028] In some embodiments, for a plurality of protrusion structures disposed in the same pixel opening, the distances between the bottom ends of at least some adjacent protrusion structures in the plurality of protrusion structures arranged along a set direction are different.

[0029] In some embodiments, for a plurality of protrusion structures disposed within a same pixel opening, at least some of the protrusion structures are tapered;

[0030] The end of the side surface facing away from the substrate is the top of the protruding structure, and the side surfaces converge at a point at the top.

[0031] In some embodiments, the tapered shape includes at least one of a cone and a pyramid.

[0032] In some embodiments, for the multiple protrusion structures disposed within the same pixel opening, at least some of the protrusion structures are trapezoidal in shape; the trapezoidal protrusion structure further includes a top surface parallel to the substrate; the top surface is located at an end of the side surface away from the substrate and connected to the side surface;

[0033] The first electrode also covers the top surface of the protruding structure; the top surface of at least part of the protruding structure has different widths in a set direction.

[0034] In some embodiments, the trapezoidal shape includes at least one of a truncated cone and a truncated pyramid.

[0035] In some embodiments, the first electrode further covers a portion of a sidewall of the pixel defining layer.

[0036] In some embodiments, the first electrode does not contact a sidewall of the pixel defining layer.

[0037] In some embodiments, the protrusion structure and the pixel defining layer are located on the same layer.

[0038] In some embodiments, for any protrusion structure, the inner angle formed by the side surface and the substrate is between 20° and 80°.

[0039] In some embodiments, the display substrate further comprises:

[0040] A pixel defining layer is located on one side of the substrate; and a first electrode is located between the pixel defining layer and the substrate.

[0041] The pixel defining layer includes multiple pixel areas, one pixel area corresponds to one pixel unit, and multiple openings are opened in one pixel area, exposing the corresponding first electrodes; one opening corresponds to a light-emitting area of ​​the pixel unit, and the light-emitting functional layer and the second electrode in each light-emitting area are arranged in the corresponding opening.

[0042] In some embodiments, for the same pixel area, the thickness of the light-emitting functional layer in multiple openings has multiple different values.

[0043] In some embodiments, the first electrode includes a reflective conductive layer and a transparent conductive layer, and the transparent conductive layer is located between the reflective conductive layer and the light-emitting functional layer; for the same pixel area, the thickness of the transparent conductive layer exposed by multiple openings has multiple different values.

[0044] A second aspect of the present invention provides a display device comprising any one of the above display substrates.

[0045] The beneficial effects of the utility model are as follows:

[0046] The utility model provides a display substrate and a display device, wherein the display substrate includes: a substrate and a pixel unit. The pixel unit is located on one side of the substrate. Each pixel unit includes: a first electrode, a light-emitting functional layer, and a second electrode. The first electrode is located on one side of the substrate; the light-emitting functional layer is located on the side of the first electrode facing away from the substrate; and the second electrode is located on the side of the light-emitting functional layer facing away from the first electrode. The first electrode, the light-emitting functional layer, and the second electrode form an optical microcavity. A pixel unit includes multiple light-emitting regions. For multiple light-emitting regions of the same pixel unit, the cavity length of the optical microcavity has multiple different values, so that the luminous brightness at multiple viewing angles can be compensated by multiple light-emitting regions with different cavity lengths, thereby overcoming the problems of brightness attenuation and color shift caused by changes in viewing angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings introduced below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 Schematic diagram of the color shift mechanism of OLED devices at large viewing angles;

[0049] Figure 2 This is a schematic diagram of a cross-sectional structure of a display substrate provided by an embodiment of the present utility model;

[0050] Figure 3 The second schematic diagram of the cross-sectional structure of the display substrate provided by the embodiment of the present utility model;

[0051] Figure 4 The third schematic diagram of the cross-sectional structure of the display substrate provided by the embodiment of the present utility model;

[0052] Figure 5 This is a fourth schematic diagram of the cross-sectional structure of a display substrate provided in an embodiment of the present utility model;

[0053] Figure 6The fifth schematic diagram of the cross-sectional structure of the display substrate provided by the embodiment of the present utility model;

[0054] Figure 7 A schematic diagram of a top view of a protruding structure provided in an embodiment of the present utility model;

[0055] Figure 8 A schematic diagram of the cross-sectional structure of the protrusion structure provided in an embodiment of the present utility model;

[0056] Figure 9 The sixth schematic diagram of the cross-sectional structure of the display substrate provided by the embodiment of the present utility model;

[0057] Figure 10 The seventh schematic diagram of the cross-sectional structure of the display substrate provided in an embodiment of the present utility model;

[0058] Figure 11 The eighth schematic diagram of the cross-sectional structure of the display substrate provided by the embodiment of the present utility model;

[0059] Figure 12 A ninth schematic diagram of a cross-sectional structure of a display substrate provided in an embodiment of the present utility model;

[0060] Figure 13 This is the tenth schematic diagram of the cross-sectional structure of the display substrate provided by an embodiment of the present utility model. DETAILED DESCRIPTION

[0061] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention will be further described below with reference to the accompanying drawings and examples. However, the example embodiments can be implemented in various forms and should not be understood as being limited to the embodiments described herein; on the contrary, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concepts of the example embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and their repeated descriptions will be omitted. The words expressing position and direction described in the present invention are all explained with reference to the accompanying drawings as examples, but changes can be made as needed, and all changes are included in the scope of protection of the present invention. The drawings of the present invention are only used to illustrate the relative position relationship and do not represent the true proportion.

[0062] Organic Light Emitting Diode (OLED) display devices have the characteristics of self-luminescence, fast response speed, wide viewing angle, high definition, high brightness, flexibility and low power consumption, and are increasingly used in the field of display technology.

[0063] During the pixel design process, traditional OLED display devices mainly consider the display effect within the normal viewing angle range. When viewed from a wide viewing angle, such as side view, there are problems such as excessive brightness attenuation and color deviation, which affect the display effect at a wide viewing angle.

[0064] Figure 1 Schematic diagram of the color shift mechanism of OLED devices at large viewing angles.

[0065] The above phenomenon can be explained from the perspective of OLED structure. Figure 1 As shown in the related art, an OLED device generally includes an anode A, a cathode C, and a light-emitting functional layer E located between the anode A and the cathode C. The anode A is generally a reflective film, and the cathode C is generally a semi-transparent film. Two reflective surfaces are formed between the anode A and the light-emitting functional layer E, and between the cathode C and the light-emitting functional layer E. This results in a significant microcavity effect within the OLED device. Light interferes in the microcavity, and by controlling the length of the microcavity, the wavelength of light that interferes constructively can be controlled. At different viewing angles, the wavelength of the coherent constructive interference satisfies the microcavity formula:

[0066]

[0067] Among them, L is the distance between the anode A and the cathode C, Q is the phase difference of the reflective surface, m is the modulus, λ is the wavelength at which coherent phase growth occurs, θ is the reflection angle when the light is reflected on the reflective surface, and the size of θ is positively correlated with the size of the viewing angle. From the above formula, it can be seen that for the same OLED device, when L and Q remain unchanged and m takes a fixed value, the value of the wavelength of coherent phase growth depends on the size of cosθ. When the viewing angle increases, the reflection angle θ increases, and the size of cosθ also increases, so the value of the wavelength λ at which coherent phase growth occurs becomes smaller. In other words, as the viewing angle increases, the wavelength corresponding to the best anti-node at different viewing angles blue-shifts. Then, for the wavelength with the best anti-node at the positive viewing angle, its light extraction efficiency decreases as the viewing angle increases, resulting in a decrease in brightness at a large viewing angle. For example, the peak wavelength of light emitted by the OLED device has an optimal anti-node at a positive viewing angle, that is, the peak wavelength of light emitted by the OLED device has the highest light extraction efficiency at a positive viewing angle. As the viewing angle increases, the light extraction efficiency of the peak wavelength of light emitted by the OLED device decreases, the proportion of the peak wavelength component in the emission spectrum of the OLED device decreases, and the proportion of the components of other wavelengths increases, resulting in a change in the emission spectrum of the OLED device at a large viewing angle compared to the positive viewing angle, which ultimately causes the problem of color deviation.

[0068] A first aspect of the present invention provides a display substrate for solving the above-mentioned problem.

[0069] Figure 2 This is one of the schematic cross-sectional structural diagrams of a display substrate provided by an embodiment of the present utility model.

[0070] In the embodiment of the present utility model, Figure 2 As shown, the display substrate includes a substrate 10 and a pixel unit 11 .

[0071] The substrate 10 is located at the bottom of the display substrate and is used to support and carry other film layers located thereon. The shape and size of the substrate 10 are adapted to the shape and size of the display substrate. Normally, the shape of the substrate 10 can be square, rectangular or the like. When applied to special-shaped displays, the shape of the substrate 10 can also be circular or other special-shaped shapes, which is not limited here. The material of the substrate 10 can be a rigid material, such as glass, to make a rigid display substrate. The material of the substrate 10 can also be a flexible material, such as polyimide (PI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), etc., to make a flexible display substrate. The flexible substrate 10 can be a single-layer structure or a multi-layer structure. When the substrate 10 adopts a multi-layer structure, a stacked structure in which organic film layers and inorganic film layers are alternately arranged can be adopted, wherein the inorganic film layer is located between adjacent organic film layers and can play a buffering role, and the inorganic film layer can be made of silicon nitride (SiN x ), silicon oxide (SiO x ) or other single materials or composite materials, which are not limited here.

[0072] The pixel unit 11 is located on one side of the substrate 10. The pixel unit 11 is used to emit light for image display. In a specific implementation, the display substrate may include a plurality of pixel units. The more pixel units there are, the higher the resolution of the image that the display substrate can display. The display substrate may also include a plurality of pixel units for emitting light of different colors. For example, the display substrate may include a red pixel unit, a green pixel unit, and a blue pixel unit. The red pixel unit, the green pixel unit, and the blue pixel unit may emit light together when the image is displayed, thereby realizing a color display. The display substrate may also include only pixel units of one color, thereby being used to display a monochrome image, which is not limited here. It should be noted that in the embodiment of the utility model, one pixel unit is taken as an example to illustrate the specific structure of the display substrate.

[0073] like Figure 2As shown, the pixel unit 11 includes a first electrode 111, a light-emitting functional layer 112, and a second electrode 113. The first electrode 111, the light-emitting functional layer 112, and the second electrode 113 form a light-emitting device, wherein the first electrode 111 is generally the anode of the light-emitting device, and the second electrode 113 is generally the cathode of the light-emitting device, or the first electrode 111 can also be the cathode of the light-emitting device, and the second electrode 113 can also be the anode of the light-emitting device, without limitation here. For example, the light-emitting device formed by the first electrode 111, the light-emitting functional layer 112, and the second electrode 113 can be an OLED device, wherein the first electrode 111 can be the anode of the OLED device, and the second electrode 113 can be the cathode of the OLED device. The light-emitting functional layer 112 can specifically include a hole injection layer HIL, a hole transport layer HTL, an organic light-emitting layer EML, an electron transport layer ETL, and an electron injection layer EIL, which are stacked in sequence along the direction from the first electrode 111 to the second electrode 1113. In specific implementations, the light-emitting functional layer 112 can also include other film layers provided to achieve or improve specific functions, without limitation here. In some embodiments, the light-emitting device formed by the first electrode 111, the light-emitting functional layer 112 and the second electrode 113 may also be a light-emitting device with a similar structure, such as a quantum dot light-emitting diode (QLED), etc., which is not limited here.

[0074] In the embodiment of the present invention, an optical microcavity is formed inside the pixel unit 11 by the first electrode 111 , the light-emitting functional layer 112 and the second electrode 113 .

[0075] For example, in some embodiments, such as in a top-emitting display substrate, the first electrode 111 of the light-emitting device is made of a material with strong reflective properties, so that it can reflect the light emitted by the light-emitting functional layer 112, thereby improving the utilization rate of the light. Specifically, the first electrode 111 can be a thick metal electrode, such as a silver (Ag) electrode, a gold (Au) electrode, and a silver / gold (Ag / Au) composite electrode, to improve the reflective performance of the first electrode. When the first electrode 111 is a thick metal electrode, the interface between the first electrode 111 and the light-emitting functional layer 112 forms a reflective surface. The second electrode 113 is made of a semi-transparent and semi-reflective material. For example, the second electrode 113 can be a thin metal electrode, such as a magnesium / silver (Mg / Ag) alloy, etc., which is not limited here. As a result, some light can be emitted from the outside of the light-emitting device through the second electrode 113 to emit light, and at the same time, the interface between the second electrode 113 and the light-emitting functional layer 112 forms a reflective surface. The pixel unit 11 forms an optical microcavity between the emitting surface of the first electrode 111 and the reflecting surface of the second electrode 113. The cavity length of the optical microcavity is the vertical distance between the reflecting surface of the first electrode 111 and the reflecting surface of the second electrode 113. Specifically, the cavity length of the optical microcavity is approximately the same as the thickness of the light-emitting functional layer 112.

[0076] In some embodiments, such as in a top-emitting display substrate, the first electrode 111 may also be a composite electrode structure in which a reflective conductive layer and a transparent conductive layer are stacked. For example, the first electrode 111 may include a metal layer and a transparent indium tin oxide (ITO) layer disposed between the metal layer and the light-emitting functional layer 112, wherein the metal layer has a relatively large thickness to serve as a reflective conductive layer to improve reflective performance, and the ITO layer has a relatively high work function, which can improve hole injection efficiency. When the first electrode 111 is a composite electrode in which a metal layer and a transparent metal oxide layer are stacked, the interface where the metal layer and the transparent metal oxide layer contact each other forms a reflective surface. The second electrode 113 is made of a semi-transparent and semi-reflective material. For example, the second electrode 113 may be a thinner metal electrode, such as a magnesium / silver (Mg / Ag) alloy, etc., which is not limited here, so that part of the light can be emitted through the second electrode 113 to the outside of the light-emitting device to emit light, and at the same time, the interface where the second electrode 113 and the light-emitting functional layer 112 contact each other forms a reflective surface. The pixel unit 11 forms an optical microcavity between the reflective surface of the first electrode 111 and the reflective surface of the second electrode 113. The cavity length of the optical microcavity is the vertical distance between the reflective surface of the first electrode 111 and the reflective surface of the second electrode 113. Specifically, the cavity length of the optical microcavity is approximately the sum of the thicknesses of the transparent conductive layer in the first electrode 111 and the light-emitting functional layer 112.

[0077] In some embodiments, such as in a top-emission display substrate, the first electrode 111 of the light-emitting device is made of a material with strong reflective properties. The specific material can be found in the aforementioned description and is not further described here. As a result, the interface between the first electrode 111 and the light-emitting functional layer 112 forms a reflective surface. The second electrode 113 is made of a transparent material with high transmittance, thereby forming a weak microcavity structure with the reflective surface of the first electrode 111. The length of the optical microcavity within the pixel unit 11 is approximately the sum of the thicknesses of the light-emitting functional layer 112 and the second electrode 113.

[0078] In some embodiments, for example, in a bottom-emission display substrate, the first electrode 111 of the light-emitting device can be made of a transparent material, or a semi-transparent and semi-reflective material, and the second electrode 111 of the light-emitting device can be made of a material with strong reflective properties, or a composite electrode structure comprising a reflective conductive layer and a transparent conductive layer, without limitation. Specifically, the structure of the light-emitting device in a bottom-emission display substrate can be obtained by inverting the structure of the light-emitting device in a top-emission display substrate, and the cavity length of the optical microcavity within the light-emitting device in the bottom-emission display substrate can refer to that of the top-emission display substrate.

[0079] In specific implementations, the specific structure of the optical microcavity formed within the pixel unit may vary depending on the specific film structure that constitutes the pixel unit, and this is not limited here. By adjusting the cavity length of the optical microcavity, the light emitted from the light-emitting functional layer 122 can be caused to oscillate in the optical microcavity, causing constructive interference to improve light extraction efficiency.

[0080] In an embodiment of the present invention, a pixel unit 11 includes multiple light-emitting areas. For the multiple light-emitting areas of the same pixel unit, the cavity length of the optical microcavity has multiple different values. Therefore, at the same viewing angle, the light spectra emitted from the light-emitting areas with different cavity lengths are different. At a wide viewing angle, optical compensation can be performed through the multiple light-emitting areas to reduce the brightness attenuation and color shift problems caused by changes in viewing angle.

[0081] For example, if Figure 2 As shown, for example, the same pixel unit includes a first light-emitting area S1, a second light-emitting area S2, and a third light-emitting area S3, and for the multiple light-emitting areas of the same pixel unit 11, the cavity length of the optical microcavity has multiple different values. For example, in the first light-emitting area S1 of the pixel unit 11, the optical microcavity has a first cavity length L1, in the second light-emitting area S2 of the pixel unit 11, the optical microcavity has a second cavity length L2, and in the third light-emitting area S3 of the pixel unit 11, the optical microcavity has a third cavity length L3. It should be noted that Figure 2In the illustrated embodiment, the optical microcavity formed by the light-emitting functional layer 112 between the first electrode 111 and the second electrode 113 is only used as an example for illustration, and is not intended to limit the embodiments of the present invention. The case where the optical microcavity formed inside the pixel unit 11 has other structures is similar and will not be described in detail here.

[0082] Specifically, according to the aforementioned microcavity formula: For the same pixel unit, at a normal viewing angle, the wavelength of coherent growth in different light-emitting regions depends on the cavity length of the optical microcavity in that region. For example, if the optical microcavities of the first light-emitting region S1 and the third light-emitting region S3 have the same cavity length, then at a normal viewing angle, the coherent growth wavelengths of the first light-emitting region S1 and the third light-emitting region S3 are both the first wavelength λ1. If the cavity length of the optical microcavity of the second light-emitting region S2 is smaller than that of the first light-emitting region S1, then the coherent growth wavelength of the second light-emitting region S2 is the second wavelength λ2, which is smaller than the first wavelength λ1. The spectra of the light emitted from the first light-emitting region S1 and the third light-emitting region S3 are the same or similar, and the spectra of the light emitted from the first light-emitting region S1 and the third light-emitting region S3 are different from the spectrum of the light emitted from the second light-emitting region S2. As the viewing angle increases, the wavelengths of the coherent growth of the first light-emitting area S1, the second light-emitting area S2, and the third light-emitting area S3 gradually decrease. When the viewing angle increases to a certain specific viewing angle V2, the wavelengths of the coherent growth of the first light-emitting area S1 and the third light-emitting area S3 are just reduced to the size of the second wavelength λ2. Therefore, in the specific design, the peak wavelength of the light emitted by the pixel unit 11 can be designed to be λ2. Then, at the normal viewing angle, the light with the peak wavelength emitted by the pixel unit 11 can coherently grow in the second light-emitting area S2, thereby improving the light extraction efficiency at the normal viewing angle and improving the brightness at the normal viewing angle. When the viewing angle increases to the specific viewing angle V2, the light with the peak wavelength emitted by the pixel unit 11 can coherently grow in the first light-emitting area S1 and the third light-emitting area 3, thereby improving the light extraction efficiency of the peak wavelength light at the specific viewing angle V2 and compensating for the brightness at a large viewing angle. Furthermore, when viewed at a specific viewing angle V2, the ratio of peak wavelengths in the emission spectrum of the pixel unit 11 is the same as or similar to that at a normal viewing angle, thereby overcoming the color shift problem at the specific viewing angle V2.

[0083] In a specific implementation, the optical microcavities of the first light-emitting region S1 and the third light-emitting region S3 may have different cavity lengths, and the cavity length of the optical microcavity of the third light-emitting region S3 may be smaller than that of the first light-emitting region S1 and larger than that of the second light-emitting region S3. This can also achieve the effect of overcoming the brightness attenuation and color shift problems at an intermediate viewing angle between the normal viewing angle V1 and the specific viewing angle V2.

[0084] Since the brightness at different viewing angles is also affected by the area of ​​the light-emitting region, in specific implementation, the brightness and color shift at different viewing angles can be made to achieve the same or similar effects by adjusting the area of ​​the light-emitting region with different optical cavity lengths.

[0085] From the above analysis, it can be seen that the more light-emitting areas included in the same pixel unit and the longer the cavity length values ​​of the optical microcavity in the light-emitting area in the same pixel unit, the more viewing angles can be compensated for brightness when viewed at a wide viewing angle. Therefore, by providing multiple light-emitting areas with different cavity lengths in the same pixel unit, brightness compensation can be performed for multiple wide viewing angles, reducing brightness attenuation and color shift problems caused by changes in viewing angle.

[0086] Figure 3 This is a second schematic diagram of the cross-sectional structure of a display substrate provided in an embodiment of the present utility model.

[0087] In some embodiments, as Figure 3 As shown, the display substrate further includes a pixel defining layer 12 and a protrusion structure 13 .

[0088] The pixel definition layer 12 is located on one side of the substrate 10. The pixel definition layer 12 defines a pixel opening K1, and the pixel unit 11 is located within the pixel opening K1. In a specific implementation, each pixel opening K1 corresponds to one pixel unit 11, and the pixel unit 11 is located within the corresponding pixel opening K1. Two adjacent pixel units 11 are separated by the pixel definition layer 12 between the two adjacent pixel openings K1.

[0089] The raised structure 13 is located within the pixel opening K1. The raised structure 13 includes a side surface 121 that is inclined relative to the substrate 10. The end of the side surface 121 closest to the substrate 10 forms a bottom end 1211 of the raised structure 13. The inner angle α formed between the side surface 121 and the substrate 10 is an acute angle. The inner angle α formed between the side surface 121 and the substrate 10 specifically refers to the angle formed between the side surface of the raised structure 13 and the substrate 10, and is located within the raised structure 13.

[0090] like Figure 3 As shown, the first electrode 111, the light-emitting functional layer 112, and the second electrode 113 of the pixel unit 11 all cover the side surfaces 121 of the protrusion structure 13, as well as the area between the bottom ends 1211 of two adjacent protrusion structures 13. The thicknesses of the first electrode 111, the light-emitting functional layer 112, and the second electrode 113 corresponding to the area between the bottom ends 1211 of adjacent protrusion structures 13 are respectively greater than the thicknesses of the first electrode 111, the light-emitting functional layer 112, and the second electrode 113 corresponding to the side surfaces 121.

[0091] Specifically, after the protruding structure 13 is made on one side of the substrate 10, the first electrode 111, the light-emitting functional layer 112 and the second electrode 113 can be formed on the side of the protruding structure 13 facing away from the substrate 10 by evaporation. During the evaporation process, since the area between the bottom ends 1211 of the two adjacent protruding structures 13 is relatively flat, the side surface 121 forms a slope compared to the area between the bottom ends 1211 of the two adjacent protruding structures 13. Therefore, the growth rate of the evaporated film layer in the area between the bottom ends 1211 of the two adjacent protruding structures 13 is greater than the growth rate on the side surface 121, so that the thickness of the first electrode 111, the light-emitting functional layer 112 and the second electrode 113 corresponding to the area between the bottom ends 1211 of the adjacent protruding structures 13 can be respectively greater than the thickness of the first electrode 111, the light-emitting functional layer 112 and the second electrode 113 corresponding to the side surface 121. For example, the light-emitting functional layer 112 corresponding to the area between the bottom ends 1211 of adjacent protrusion structures 13 has a first thickness T1, and the light-emitting functional layer 112 corresponding to the side surface 121 has a second thickness T2. The first thickness T1 is greater than the second thickness T2.

[0092] In a specific implementation, when the light-emitting functional layer 112 is formed on the side of the raised structure 13 facing away from the substrate 10 by evaporation, the thickness of the light-emitting functional layer 112 corresponding to the region between the bottom ends 1311 of adjacent raised structures 13 and the thickness of the light-emitting functional layer 112 corresponding to the side 131 approximately satisfy the following relationship: T2 = T1 × cosα. The thickness of the first electrode 111 corresponding to the region between the bottom ends 1311 of adjacent raised structures 13 and the thickness of the first electrode 111 corresponding to the side 131, as well as the thickness of the second electrode 113 corresponding to the region between the bottom ends 1311 of adjacent raised structures 13 and the thickness of the second electrode 113 corresponding to the side 131, also approximately satisfy the above relationship and are not further described here. The inner angle α formed by the side 121 and the substrate 10 can be between 20° and 80°. By adjusting the inner angle α formed by the side 121 and the substrate 10, brightness and color shift issues at specific viewing angles can be improved.

[0093] After forming a raised structure 13 on one side of the substrate 10, a first electrode 111, a light-emitting functional layer 112, and a second electrode 113 are formed on the side of the raised structure 13 facing away from the substrate 10 by evaporation. This allows the same pixel unit 11 to form light-emitting regions with different thicknesses in the area corresponding to the side surface 121 and in the area between the bottom ends 1211 of two adjacent raised structures 13. The optical microcavities formed by the light-emitting regions with different thicknesses have different cavity lengths, thereby compensating for brightness at multiple wide viewing angles and reducing the problems of brightness attenuation and color shift caused by changes in viewing angle.

[0094] In addition, by forming the first electrode 111 on the side of the protruding structure 13 facing away from the substrate 10, the protruding surface of the protruding structure 13 can significantly increase the area of ​​the first electrode 111. The effective light-emitting area of ​​the pixel unit 11 is generally proportional to the area of ​​the first electrode 111. Therefore, increasing the area of ​​the first electrode 111 is conducive to increasing the aperture ratio and improving the brightness of the display panel. And according to the formula for the luminous brightness of the pixel unit: Where B represents the luminance of the pixel unit, η represents the device efficiency of the pixel unit (light-emitting device), I is the current, S represents the area of ​​the pixel opening, and R represents the aperture ratio. Represents the current density. The greater the current density, the shorter the life of the pixel unit. From the above formula, we can see that at the same brightness, increasing the aperture ratio R is beneficial to reducing the current density. Improve the life of the pixel unit; on the contrary, under the premise of ensuring that the pixel life remains unchanged, that is, the current density When it remains unchanged, it is beneficial to improve the luminous brightness.

[0095] Figure 4 This is a third schematic diagram of the cross-sectional structure of the display substrate provided in an embodiment of the present utility model.

[0096] In some embodiments, as Figure 4 As shown, the first electrode 111 also covers part of the side wall 121 of the pixel defining layer 12, thereby further increasing the light emitting area of ​​the pixel unit 11, which is beneficial to further improve the pixel aperture ratio of the display substrate and improve the brightness of the display panel.

[0097] Figure 5 This is the fourth schematic diagram of the cross-sectional structure of the display substrate provided by an embodiment of the present utility model.

[0098] In some embodiments, as Figure 5 As shown, the first electrode 111 does not contact the sidewall 121 of the pixel defining layer 12. Specifically, by reducing the area of ​​the first electrode 111, edge light leakage caused by an excessively large light-emitting area of ​​the pixel unit can be avoided, thereby preventing crosstalk between adjacent pixel units.

[0099] In some embodiments, the raised structure 13 and the pixel defining layer 12 can be arranged in the same layer. Specifically, the raised structure 13 and the pixel defining layer 12 are arranged in the same layer, specifically referring to that the raised structure 13 and the pixel defining layer 12 can be formed by etching the same film layer in the same mask process, thereby reducing the etching process and improving production efficiency. In a specific implementation, a drive circuit layer is also provided between the pixel defining layer 12 and the substrate 10, and the drive circuit layer is provided with a pixel circuit for driving the pixel unit 11 (not shown in the figure). After the raised structure 13 and the pixel defining layer 12 are completed, a via (not shown in the figure) for connecting the first electrode 111 and the pixel circuit can be opened in the area of ​​the pixel opening K1, and then the first electrode 111, the light-emitting functional layer 112 and the second electrode 113 are sequentially evaporated in the pixel opening K1, wherein the first electrode is connected to the pixel circuit through the via. In a specific implementation, it can be made according to the specific structure of the display substrate and with reference to relevant technologies, which will not be described here.

[0100] In some embodiments, the protruding structure 13 and the pixel defining layer 12 may also be provided in different film layers. For example, during specific production, the protruding structure 13 may be first produced on the side of the driving circuit layer (not shown in the figure) facing away from the substrate 10, and then a via (not shown in the figure) for connecting the first electrode 111 and the pixel circuit may be provided; then the first electrode 111 may be produced on the side of the protruding structure 13 facing away from the driving circuit layer, and the first electrode 111 and the pixel circuit may be connected through the via; then, with reference to relevant technologies, the pixel defining layer 12 may be produced on the side of the first electrode 111 facing away from the substrate 10, and a pixel opening K1 exposing the first electrode 111 may be provided in the pixel defining layer 12, and the light-emitting functional layer 112 and the second electrode 113 may be sequentially evaporated in the pixel opening K1. In specific implementation, the production may be carried out according to the specific structure of the display substrate and with reference to relevant technologies, and will not be elaborated here.

[0101] Figure 6 This is the fifth schematic diagram of the cross-sectional structure of the display substrate provided by the embodiment of the present utility model.

[0102] In some embodiments, as Figure 6 As shown, a plurality of protrusion structures 13 are provided in the same pixel opening K1. In specific implementation, the three-dimensional shape and size of the protrusion structures 13 in the same pixel opening K1 can be set to be the same, thereby reducing the difficulty of mask design and display substrate manufacturing. Specifically, the three-dimensional shape and size of the plurality of protrusion structures 13 are the same, specifically referring to the three-dimensional shape of the plurality of protrusion structures 13 being of the same type, for example, all being truncated cones, truncated pyramids, cones or pyramids, and having the same size. Figure 6As shown, the shape and size of the protrusion 13 are primarily determined by the angle α formed between the side surface 131 and the substrate 10, the height of the protrusion 13, and the width W1 of the bottom end of the protrusion 13. The height of the protrusion 13 specifically refers to the vertical distance between the bottom end 1311 of the protrusion 13 and the top end of the protrusion 13, where the top end of the protrusion 13 is the end of the side surface 131 of the protrusion 13 away from the substrate 10. The width W1 of the bottom end of the protrusion 13 specifically refers to the width of the bottom end 1311 of the protrusion 13 along a cross-section of the protrusion 13 in a specific direction. The cross-section in the specific direction is perpendicular to the substrate 10 and passes through the geometric center of the figure formed by the orthographic projection of the bottom end 1311 of the protrusion 13 on the substrate 10. It should be noted that the specific direction can be any direction. When comparing the widths W1 of the bottom ends of multiple protrusion structures 13, it is sufficient to measure the widths W1 of the multiple protrusion structures 13 in the same direction. In specific implementation, the multiple protrusion structures 13 have the same size. Specifically, the inner angle α formed by the side surfaces 131 of the multiple protrusion structures 13 and the substrate 10 can be the same, the height of the multiple protrusion structures 13 can be the same, and the width W1 of the bottom ends of the multiple protrusion structures 13 can be the same.

[0103] In some embodiments, as Figure 6 As shown, it is also possible to set the distance W2 between the bottom ends 1311 of any two adjacent protrusion structures 13 arranged in any direction within the same pixel opening K1 to be the same, thereby reducing the difficulty of mask design and display substrate manufacturing. It should be noted that the multiple protrusion structures 13 arranged in any direction referred to in the embodiments of the present invention specifically refer to the geometric centers of the orthographic projections of the bottom ends of the multiple protrusion structures 13 on the substrate 10 being located on or approximately on the same straight line, and the extension direction of the straight line is the arrangement direction of the multiple protrusion structures 13.

[0104] In some embodiments, a plurality of protrusion structures are disposed within the same pixel opening, and within the same pixel opening, the inner angle formed between the side surface of the protrusion structure and the substrate has a plurality of different values. Specifically, within the same pixel opening, the inner angle formed between the side surface of the protrusion structure and the substrate has a plurality of different values, which may include, for the same protrusion structure, the inner angle formed between the side surface of the protrusion structure and the substrate having a plurality of different values, and / or, for different protrusion structures, the inner angle formed between the side surfaces of different protrusion structures and the substrate at corresponding positions having a plurality of different values. The specific situation will be described in detail below. By allowing the side surfaces of the raised structure to have multiple different inner angles with the substrate within the same pixel opening, according to the aforementioned film thickness relationship formula: T2 = T1 × cosα, it can be seen that for multiple side surfaces forming different inner angles with the substrate, the film thicknesses of the first electrode, light-emitting functional layer, and second electrode formed on these multiple side surfaces are all different. This allows for the formation of multiple light-emitting regions of varying thicknesses on these multiple side surfaces. The optical microcavity formed within each light-emitting region has a different cavity length, which facilitates compensating the display substrate's luminance at a wider range of viewing angles, further reducing brightness decay and color shift issues caused by viewing angle variations. The greater the number of inner angles formed by the side surfaces of the raised structure with the substrate within the same pixel opening, the more significant the improvement in brightness decay and color shift issues across different viewing angles.

[0105] Figure 7 A schematic diagram of a top view of a protruding structure provided in an embodiment of the present utility model; Figure 8 This is a schematic diagram of the cross-sectional structure of the protrusion structure provided in an embodiment of the present utility model.

[0106] In some embodiments, for at least one protrusion structure disposed within a same pixel opening, at multiple locations around the protrusion structure, the inner angle formed by the side surface of the protrusion structure and the substrate has multiple different values ​​corresponding to the multiple locations. Figure 7 As shown, the shape of the raised structure can be a quadrangular pyramid, and the side surfaces of the raised structure corresponding to the four sides of the quadrilateral are divided into a first side surface 131A, a second side surface 131B, a third side surface 131C and a fourth side surface 131D. Around the raised structure, the sizes of the inner angles formed by the first side surface 131A, the second side surface 131B, the third side surface 131C and the fourth side surface 131D and the substrate are all different. Figure 8 for Figure 7 The cross-section along the section line AA, specifically, Figure 8 As shown, the inner angle formed by the fourth side surface 131D and the substrate has a first value α1, and the inner angle formed by the second side surface 131B and the substrate has a second value α2, and the first value α1 is smaller than the second value α2. When the shape of the protrusion structure is other shapes, it can also refer to Figure 7 and Figure 8 The embodiment shown in the figure has similar settings, which will not be described in detail here. Figure 7 and Figure 8 The specific number or ratio of the similarly arranged protruding structures in the illustrated embodiment can be adjusted according to actual conditions and is not limited here.

[0107] Figure 9 This is the sixth schematic diagram of the cross-sectional structure of the display substrate provided by an embodiment of the present utility model.

[0108] In some embodiments, for multiple protrusion structures disposed within the same pixel opening, the value of the inner angle formed between the side surface of any protrusion structure and the substrate at a set position is different from the value of the inner angle formed between the side surface of at least one other protrusion structure and the substrate at a corresponding position. Figure 9 As shown, the multiple protrusion structures arranged in the same pixel opening K1 include a first protrusion structure 13A and a second protrusion structure 13B, wherein the inner angle formed by the side surface of the first protrusion structure 13A and the substrate 10 at a set position is a first value α1, and the inner angle formed by the side surface of the second protrusion structure 13B and the substrate 10 at a corresponding position is a second value α2, and the first value α1 is smaller than the second value α2. Among them, the orthographic projection of the set position of the first protruding structure 13A on the substrate 10 is located at a first point, the geometric center of the orthographic projection figure of the bottom end of the first protruding structure 13A on the substrate 10 is located at a second point, the orthographic projection of the corresponding position of the second protruding structure 13B on the substrate 10 is located at a third point, the geometric center of the orthographic projection figure of the bottom end of the second protruding structure 13B on the substrate 10 is located at a fourth point, the line between the third point and the fourth point is parallel or approximately parallel to the line between the second point and the first point, and the direction from the second point to the first point is the same or approximately the same as the direction from the fourth point to the third point.

[0109] Figure 10 This is the seventh schematic diagram of the cross-sectional structure of the display substrate provided in an embodiment of the present utility model.

[0110] In some embodiments, for multiple protrusion structures disposed within the same pixel opening, at least two protrusion structures may have different heights. Figure 10As shown, the multiple raised structures provided within the same pixel opening include a first raised structure 13A and a third raised structure 13B, wherein the first raised structure 13A has a first height H1, and the third raised structure 13C has a second height H2, and the second height H2 is greater than the first height H1. By adjusting the height of the raised structure, the area of ​​the side of the raised structure can be adjusted, thereby further adjusting the luminous brightness of the luminous area corresponding to the side of the raised structure. In specific implementation, the heights of the multiple raised structures provided within the same pixel opening do not have to be set to the same. Instead, the heights of the multiple raised structures can be adjusted individually to make the luminous brightness of the display substrate more uniform at various viewing angles. In specific implementation, adjustments can be made based on the specific structure of the display substrate and are not limited here.

[0111] In some embodiments, for multiple protrusion structures arranged in the same pixel opening, the distances between the bottom ends of at least some adjacent protrusion structures arranged along a set direction may be different. Figure 10 As shown, the multiple convex structures provided in the same pixel opening K1 include a first convex structure 13A, a second convex structure 13B, and a third convex structure 13C. The first convex structure 13A, the second convex structure 13B, and the third convex structure 13C are arranged along a set direction and are adjacent to each other. The set direction can be any direction. Specifically, the arrangement of the first convex structure 13A, the second convex structure 13B, and the third convex structure 13C along the set direction means that the geometric center of the orthographic projection shape of the bottom end of the first convex structure 13A on the substrate, the geometric center of the orthographic projection shape of the bottom end of the second convex structure 13B on the substrate, and the geometric center of the orthographic projection shape of the bottom end of the third convex structure 13C on the substrate are all located or approximately located on the same straight line extending along the set direction. Figure 10 As shown, a first spacing W3 can be set between the bottom ends of the first protrusion structure 13A and the bottom ends of the second protrusion structure 13B, and a second spacing W4 can be set between the bottom ends of the second protrusion structure 13B and the bottom ends of the third protrusion structure 13C along a set direction, where the first spacing W3 is smaller than the second spacing W4. By adjusting the spacing between the bottom ends of adjacent protrusion structures, the area of ​​the light-emitting region located between the bottom ends of adjacent protrusion structures can be adjusted, thereby adjusting the brightness of the light-emitting region located between the bottom ends of adjacent protrusion structures, thereby achieving a more uniform brightness of the display substrate at various viewing angles. In specific implementation, adjustments can be made based on the specific structure of the display substrate and are not limited here.

[0112] In some embodiments, as Figure 10As shown, for the multiple protrusion structures provided in the same pixel opening K1, at least some of the protrusion structures are in the shape of a trapezoid, and the trapezoidal protrusion structure further includes a top surface 132 parallel to the substrate 10. The top surface is located at the end of the side surface 131 away from the substrate 100, that is, the top surface 132 is located at the top of the protrusion structure, and the top surface 132 and the side surface 131 are connected to each other. Figure 10 and Figure 3 As shown, the first electrode 111 also covers the top surface 132 of the protruding structure 13. In specific implementation, the top surface 132 of at least part of the protruding structure in the same pixel opening K1 can be set to have different widths in a set direction. Figure 10 As shown, the multiple raised structures disposed within the same pixel opening K1 include a first raised structure 13A and a fourth raised structure 13D. Both the first raised structure 13A and the fourth raised structure 13D are trapezoidal raised structures. The top surface of the first raised structure 13A has a first width W5 in a set direction, and the top surface of the fourth raised structure 13D has a second width W6 in the set direction, wherein the first width W5 is greater than the second width W6. The set direction can be any direction. When comparing the first width W5 and the second width W6, the top surface widths of the first raised structure 13A and the fourth raised structure 13D can be measured along the same set direction. Furthermore, when measuring the top surface width of the first raised structure 13A, the measurement needs to be conducted along the set direction and through the geometric center of the top surface of the first raised structure 13A. When measuring the top surface width of the fourth raised structure 13D, the measurement needs to be conducted along the set direction and through the geometric center of the top surface of the fourth raised structure 13D. By adjusting the width of the top surface of the raised structure, the area of ​​the light-emitting region corresponding to the top surface of the raised structure can be adjusted, thereby adjusting the brightness of the light-emitting region corresponding to the top surface of the raised structure, thereby achieving a more uniform brightness of the display substrate at various viewing angles. In specific implementation, the adjustment can be made based on the specific structure of the display substrate and is not limited here.

[0113] In a specific implementation, the shape of the trapezoidal protrusion structure provided within the same pixel opening K1 can be at least one of a truncated cone or a prism, and the prism can be a triangular prism, a quadrangular prism, a pentagonal prism, etc., without limitation herein. For example, the shape of the trapezoidal protrusion structure provided within the same pixel opening K1 can be entirely truncated cones, entirely prisms, or partially truncated cones and the remainder prisms, without limitation herein. In some embodiments, the shape of the trapezoidal protrusion structure can also include other trapezoidal structures, without limitation herein.

[0114] To summarize, when the shape of the raised structure is a trapezoid, the brightness of the pixel unit at different viewing angles can be adjusted by adjusting the size of the inner angle formed by the side of the raised structure and the substrate, the height of the raised structure, the width of the top surface of the raised structure, and the spacing between the bottom ends of adjacent raised structures, thereby ultimately improving the brightness attenuation and color deviation problems of the display substrate at different viewing angles.

[0115] Figure 11 This is the eighth schematic diagram of the cross-sectional structure of the display substrate provided by an embodiment of the present utility model.

[0116] In some embodiments, for the multiple protrusion structures disposed in the same pixel opening K1, at least some of the protrusion structures are conical in shape. Figure 11 As shown, the end of the side surface 131 facing away from the substrate 10 is the top 1312 of the protruding structure. The side surfaces 131 of the conical protruding structure converge at a point at the top 1312 to form a cone.

[0117] During specific implementation, the shape of the conical protrusion structure provided in the same pixel opening K1 can be specifically at least one of a cone or a pyramid, and the pyramid can be specifically a triangular pyramid, a quadrangular pyramid, a pentagonal pyramid, etc., which is not limited here. For example, the shape of the conical protrusion structure provided in the same pixel opening K1 can be all cones, or all pyramids, or part of it can be a cone and the rest of it can be a pyramid, which is not limited here. In some embodiments, the shape of the conical protrusion structure can also include other conical structures, which are not limited here. When the shape of the protrusion structure is conical, the luminous brightness of the pixel unit at different viewing angles can be adjusted by adjusting the size of the inner angle formed by the side of the protrusion structure and the substrate, the height of the protrusion structure, and the spacing between the bottom ends of adjacent protrusion structures, thereby improving the problems of brightness attenuation and color deviation of the display substrate at different viewing angles.

[0118] In some embodiments, as Figure 10 As shown, the multiple protrusion structures provided in the same pixel opening K1 can all be provided as trapezoidal structures. Figure 11 As shown, all of the multiple protrusions in the same pixel opening K1 can be configured as conical structures. In some embodiments, part of the multiple protrusions in the same pixel opening K1 can be configured as trapezoidal structures, and the rest can be configured as conical structures, which is not limited here.

[0119] Figure 12 This is a ninth schematic diagram of the cross-sectional structure of a display substrate provided in an embodiment of the present utility model.

[0120] In some embodiments, as Figure 12As shown, the display substrate further includes a pixel defining layer 12. The pixel defining layer 12 is located on one side of the substrate 10. The first electrode 111 is located between the pixel defining layer 12 and the substrate 10. During fabrication, the first electrode 111 can be fabricated on one side of the substrate 10, and then the pixel defining layer 12 can be fabricated on the side of the first electrode 111 facing away from the substrate 10.

[0121] like Figure 12 As shown, the pixel defining layer 12 includes a plurality of pixel regions P, and adjacent pixel regions P are separated by the pixel defining layer 12. One pixel region P corresponds to one pixel unit 11, that is, the first electrode 111, the light-emitting functional layer 112, and the second electrode 113 in the same pixel region P constitute the pixel unit 11 corresponding to the pixel region P. A plurality of openings K are provided in one pixel region P, and adjacent openings K are separated by the pixel defining layer, and each opening K exposes the first electrode 111 of the pixel unit 11 corresponding to the pixel region P. One opening K corresponds to one light-emitting region of the pixel unit 11, and the light-emitting functional layer 112 and the second electrode 113 in each light-emitting region are arranged in the corresponding opening K. In a specific implementation, the light-emitting functional layer 112 can be filled in the opening K by inkjet printing or the like. By controlling the thickness of the light-emitting functional layer 112 in each opening K and / or controlling the thickness of the transparent metal oxide layer in the first electrode 111, the cavity length of the optical microcavity formed in each opening K can be controlled, thereby achieving multiple different values ​​of the cavity length of the optical microcavity for multiple light-emitting areas of the same pixel unit 11.

[0122] In some embodiments, for the same pixel region P, the thickness of the light-emitting functional layer 112 in the plurality of openings K has a plurality of different values. For example, Figure 12 As shown, the multiple openings K correspond to the first light-emitting area S1, the second light-emitting area S2 and the third light-emitting area S3 of the pixel unit respectively. In terms of specific settings, the thickness of the light-emitting functional layer 112 in the first light-emitting area S1 and the thickness of the light-emitting functional layer 112 in the third light-emitting area S3 can be set to be greater than the thickness of the light-emitting functional layer 112 in the second light-emitting area S2. Therefore, by adjusting the thickness of the light-emitting functional layer 112, the cavity length of the optical microcavity in each light-emitting area can be adjusted.

[0123] Figure 13 This is the tenth schematic diagram of the cross-sectional structure of the display substrate provided by an embodiment of the present utility model.

[0124] In some embodiments, as Figure 13As shown, the first electrode includes a reflective conductive layer 111A and a transparent conductive layer 111B. The transparent conductive layer 111B is located between the reflective conductive layer 111A and the light-emitting functional layer 112, and the transparent conductive layer 111B can be in direct contact with the light-emitting functional layer 112. The thickness of the transparent conductive layer 111B and the thickness of the light-emitting functional layer 112 together determine the cavity length of the optical microcavity. In specific implementations, the thickness of the transparent conductive layer 111B exposed by multiple openings K can be set to have multiple different values. For example, Figure 13 As shown, the thickness of the transparent conductive layer 111B exposed by the opening K corresponding to the first light-emitting region S1 and the thickness of the transparent conductive layer 111B exposed by the opening K corresponding to the third light-emitting region S3 can be set to be greater than the thickness of the transparent conductive layer 111B exposed by the opening K corresponding to the second light-emitting region S2, thereby adjusting the cavity length of the optical microcavity in each light-emitting region by adjusting the thickness of the light-emitting functional layer 112.

[0125] In specific implementation, the thickness of the light-emitting functional layer 112 or the thickness of the transparent conductive layer 111B can be adjusted separately, or the thickness of the light-emitting functional layer 112 and the thickness of the transparent conductive layer 111B can be adjusted simultaneously to adjust the cavity length of the optical microcavity formed in different openings, which is not limited here.

[0126] In specific implementations, the display substrate provided by the embodiments of the present invention may also include other structures not mentioned in the aforementioned embodiments but necessary to achieve specific functions, which are not described in detail here. The specific structure of the display substrate provided by the embodiments of the present invention may also be adjusted according to actual conditions without violating the intent of the present invention, and is not limited here.

[0127] A second aspect of the present invention further provides a display device. The display device provided in an embodiment of the present invention includes the display substrate provided in any of the aforementioned embodiments. In specific implementations, the display device provided in an embodiment of the present invention has the same or similar technical effects as any of the aforementioned embodiments, and further description thereof is omitted here. The display device provided in an embodiment of the present invention can specifically be: a mobile phone, a tablet computer, a laptop computer, a display, a monitor, etc., without limitation herein.

[0128] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0129] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A display substrate, wherein: include: substrate; A pixel unit, located on one side of the substrate; At least one of the pixel units comprises: a first electrode, located on one side of the substrate; a light-emitting functional layer, located on a side of the first electrode facing away from the substrate; a second electrode, located on a side of the light-emitting functional layer facing away from the first electrode; The first electrode, the light-emitting functional layer and the second electrode form an optical microcavity; one pixel unit includes multiple light-emitting areas, and for the multiple light-emitting areas of the same pixel unit, the cavity length of the optical microcavity has multiple different values.

2. The display substrate according to claim 1, wherein: The display substrate further includes: A pixel defining layer is located on one side of the substrate; the pixel defining layer is provided with a pixel opening; the pixel unit is located in the pixel opening; a raised structure located in the pixel opening; the raised structure includes a side surface inclined relative to the substrate, an end of the side surface close to the substrate being a bottom end of the raised structure, and an inner angle formed by the side surface and the substrate being an acute angle; The first electrode, the light-emitting functional layer and the second electrode all cover the side surfaces of the protruding structures, and cover the areas between the bottom ends of adjacent protruding structures.

3. The display substrate according to claim 2, wherein: The thicknesses of the first electrode, the light-emitting functional layer and the second electrode corresponding to the area between the bottom ends of adjacent protruding structures are respectively greater than the thicknesses of the first electrode, the light-emitting functional layer and the second electrode corresponding to the side surfaces.

4. The display substrate according to claim 3, wherein: The thickness of the light-emitting functional layer corresponding to the region between the bottom ends of adjacent protrusion structures and the thickness of the light-emitting functional layer corresponding to the side surface satisfy: T2 = T1 × cosα; Wherein, T1 represents the thickness of the light-emitting functional layer corresponding to the area between the bottom ends of adjacent protruding structures, T2 represents the thickness of the light-emitting functional layer corresponding to the side surface, and α represents the angle between the side surface and the inner side of the substrate.

5. The display substrate according to claim 4, wherein: A plurality of the protrusion structures are arranged in the same pixel opening; The three-dimensional shape and size of the protrusion structures in the same pixel opening are the same; Among the plurality of protrusion structures arranged along any direction in the same pixel opening, the distance between the bottom ends of any two adjacent protrusion structures is the same.

6. The display substrate according to claim 4, wherein: A plurality of the protrusion structures are arranged in the same pixel opening; In the same pixel opening, the inner angle formed by the side surface of the protruding structure and the substrate has multiple different values.

7. The display substrate according to claim 6, wherein: For at least one of the protruding structures disposed in the same pixel opening, at multiple positions around the protruding structure, an inner angle formed by a side surface of the protruding structure and the substrate has multiple different values ​​corresponding to the multiple positions.

8. The display substrate according to claim 7, wherein: For the multiple protrusion structures arranged in the same pixel opening, the value of the inner angle formed by the side surface of any protrusion structure and the substrate at a set position is different from the value of the inner angle formed by the side surface of at least one other protrusion structure and the substrate at a corresponding position.

9. The display substrate according to claim 8, wherein: For the plurality of protrusion structures disposed in the same pixel opening, at least two of the protrusion structures have different heights.

10. The display substrate according to claim 8, wherein: For the plurality of protrusion structures disposed in the same pixel opening, the distances between the bottom ends of at least some adjacent protrusion structures in the plurality of protrusion structures arranged along a set direction are different.

11. The display substrate according to claim 10, wherein: For the plurality of protrusion structures arranged in the same pixel opening, at least some of the protrusion structures are tapered; An end of the side surface facing away from the substrate is a top end of the protruding structure, and the side surfaces converge at a point at the top end.

12. The display substrate according to claim 10, wherein: For the plurality of protrusion structures disposed within the same pixel opening, at least some of the protrusion structures are trapezoidal in shape; the trapezoidal protrusion structure further includes a top surface parallel to the substrate; the top surface is located at an end of the side surface away from the substrate and connected to the side surface; The first electrode also covers the top surface of the protruding structure; the top surface of at least part of the protruding structure has different widths in a set direction.

13. The display substrate according to claim 2, wherein: The first electrode also covers a portion of a sidewall of the pixel defining layer.

14. The display substrate according to claim 2, wherein: The first electrode does not contact a sidewall of the pixel defining layer.

15. The display substrate according to claim 2, wherein: The protrusion structure and the pixel defining layer are located on the same layer.

16. The display substrate according to claim 2, wherein: For any of the protruding structures, the inner angle formed by the side surface and the substrate is between 20° and 80°.

17. The display substrate according to claim 1, wherein: The display substrate further includes: A pixel defining layer is located on one side of the substrate; the first electrode is located between the pixel defining layer and the substrate; The pixel defining layer includes multiple pixel areas, one pixel area corresponds to one pixel unit, multiple openings are opened in one pixel area, and the openings expose the corresponding first electrodes; one opening corresponds to a light-emitting area of ​​the pixel unit, and the light-emitting functional layer and the second electrode in each light-emitting area are arranged in the corresponding opening.

18. The display substrate according to claim 17, wherein: For the same pixel area, the thickness of the light-emitting functional layer in the plurality of openings has a plurality of different values.

19. The display substrate according to claim 17, wherein: The first electrode includes a reflective conductive layer and a transparent conductive layer, and the transparent conductive layer is located between the reflective conductive layer and the light-emitting functional layer; for the same pixel area, the thickness of the transparent conductive layer exposed by multiple openings has multiple different values.

20. A display device, wherein: The display substrate comprises the display substrate according to any one of claims 1 to 19.

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