Display substrate and display device

Abstract

The invention provides a display substrate and a display device. The display substrate comprises a substrate and pixel units. 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] This disclosure relates to the field of display technology, and more particularly to a display substrate and a display device. Background Technology

[0002] Organic light-emitting diode (OLED) display devices have the characteristics of self-illumination, 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] Traditional OLED display devices primarily consider the display effect within the frontal viewing angle range during pixel design. When the viewing angle changes, such as when viewed from the side or other large viewing angles, there are issues with excessive brightness attenuation and color shift, affecting the display effect when viewed from a large viewing angle. Summary of the Invention

[0004] This disclosure provides a display substrate and a display device to overcome the problems of brightness attenuation and color shift caused by changes in viewing angle.

[0005] A first aspect of this disclosure provides a display substrate, comprising:

[0006] Substrate;

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

[0008] The first electrode is located on one side of the substrate;

[0009] The light-emitting functional layer is located on the side of the first electrode that is away from the substrate;

[0010] The second electrode is located on the side of the light-emitting functional layer opposite to 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 regions, and for the multiple light-emitting regions of the same pixel unit, the cavity length of the optical microcavity has multiple different values.

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

[0013] A pixel defining layer is located on one side of the substrate; the pixel defining layer has pixel openings; pixel units are located in the pixel openings;

[0014] The protrusion structure is located in the pixel opening; the protrusion structure includes a side surface that is inclined relative to the substrate, the end of the side surface closer to the substrate is the bottom end of the protrusion structure, and the 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 sides of the raised structure and the area between the bottom ends of adjacent raised structures.

[0016] In some embodiments, the thickness of the first electrode, the light-emitting functional layer, and the second electrode corresponding to the region between the bottom ends of adjacent protrusions is greater than the thickness of the first electrode, the light-emitting functional layer, and the second electrode corresponding to the side surface.

[0017] In some embodiments, the thickness of the light-emitting functional layer corresponding to the region between the bottom ends of adjacent protrusions satisfies the same condition as the thickness of the light-emitting functional layer corresponding to the side surface:

[0018] T2 = T1 × cosα;

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

[0020] In some embodiments, multiple protrusion structures are provided within the same pixel opening;

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

[0022] In a pixel opening, among multiple protrusions arranged in any direction, the distance between the bottom ends of any two adjacent protrusions is the same.

[0023] In some embodiments, multiple protrusion structures are provided within the same pixel opening;

[0024] Within the same pixel opening, the angle between the side of the protrusion structure and the inner side of the substrate has multiple different values.

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

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

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

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

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

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

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

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

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

[0034] In some embodiments, the frustum shape includes at least one of a frustum of a cylinder and a frustum of a prism.

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

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

[0037] In some embodiments, the protrusion structure and the pixel definition 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 includes:

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

[0041] The pixel definition layer includes multiple pixel regions, each pixel region corresponds to a pixel unit, and multiple openings are provided in each pixel region, with the openings exposing the corresponding first electrode; each opening corresponds to a light-emitting region of the pixel unit, and the light-emitting functional layer and the second electrode in each light-emitting region are disposed in the corresponding opening.

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

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

[0044] A second aspect of this disclosure provides a display device comprising a display substrate according to any one of the above.

[0045] The beneficial effects of this disclosure are as follows:

[0046] This disclosure provides a display substrate and a display device. The display substrate includes a substrate and pixel units. The pixel units are 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 the multiple light-emitting regions of the same pixel unit, the cavity length of the optical microcavity has multiple different values, thereby compensating for the luminous brightness at multiple viewing angles through multiple light-emitting regions with different cavity lengths, overcoming the problems of brightness attenuation and color shift caused by changes in viewing angle. Attached Figure Description

[0047] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments of this disclosure will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 A schematic diagram illustrating the viewing angle bias mechanism of OLED devices;

[0049] Figure 2 This is one of the schematic cross-sectional views of the display substrate provided in the embodiments of this disclosure;

[0050] Figure 3 This is a second schematic diagram of the cross-sectional structure of the display substrate provided in the embodiments of this disclosure;

[0051] Figure 4 This is the third schematic diagram of the cross-sectional structure of the display substrate provided in the embodiments of this disclosure;

[0052] Figure 5 Fourth schematic diagram of the cross-sectional structure of the display substrate provided in the embodiments of this disclosure;

[0053] Figure 6 Fifth schematic diagram of the cross-sectional structure of the display substrate provided in the embodiments of this disclosure;

[0054] Figure 7 This is a top view of the protruding structure provided in an embodiment of the present disclosure;

[0055] Figure 8 This is a schematic diagram of the cross-sectional structure of the protrusion provided in an embodiment of the present disclosure;

[0056] Figure 9 This is the sixth schematic diagram of the cross-sectional structure of the display substrate provided in the embodiments of this disclosure;

[0057] Figure 10 Seventh schematic diagram of the cross-sectional structure of the display substrate provided in the embodiments of this disclosure;

[0058] Figure 11 Eighth schematic diagram of the cross-sectional structure of the display substrate provided in the embodiments of this disclosure;

[0059] Figure 12 This is the ninth schematic diagram of the cross-sectional structure of the display substrate provided in the embodiments of this disclosure;

[0060] Figure 13 This is the tenth schematic diagram of the cross-sectional structure of the display substrate provided in the embodiments of this disclosure. Detailed Implementation

[0061] To make the above-described objects, features, and advantages of this disclosure more apparent and understandable, the disclosure will be further described below in conjunction with the accompanying drawings and embodiments. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the disclosure more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the figures denote the same or similar structures, and therefore repeated descriptions of them will be omitted. Terms describing position and direction as described in this disclosure are illustrative of the accompanying drawings, but changes may be made as needed, and all such changes are included within the scope of protection of this disclosure. The accompanying drawings of this disclosure are for illustrative purposes only and do not represent actual scale.

[0062] Organic light-emitting diode (OLED) display devices have the characteristics of self-illumination, 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] Traditional OLED display devices primarily consider the display effect within the frontal viewing angle range during pixel design. When viewed from a wider angle, such as from the side, there are issues with excessive brightness attenuation and color shift, affecting the display effect when viewed from a wide angle.

[0064] Figure 1A schematic diagram illustrating the large-viewpoint bias mechanism of OLED devices.

[0065] The above phenomenon can be explained by the structure of OLEDs. For example... Figure 1 As shown, in related technologies, OLED devices typically include 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 usually a reflective film, and the cathode C is usually 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, resulting in a significant microcavity effect within the OLED device. Light interferes within the microcavity, and by controlling the length of the microcavity, the wavelength of the constructive interference light can be controlled. At different viewing angles, the wavelength of the constructive interference satisfies the microcavity formula:

[0066]

[0067] Where L is the distance between the anode A and the cathode C, Q is the phase difference between the reflecting surfaces, m is the modulus, λ is the wavelength at which coherent and constructive reflection occurs, and θ is the reflection angle when light is reflected from the reflecting surface. The magnitude of θ is positively correlated with the viewing angle. From the above formula, it can be seen that for the same OLED device, with L and Q constant and m taking a fixed value, the wavelength at which coherent and constructive reflection occurs depends on the magnitude of cosθ. When the viewing angle is larger, the reflection angle θ is larger, and the magnitude of cosθ is also larger, thus the value of the wavelength λ at which coherent and constructive reflection occurs decreases. That is to say, as the viewing angle increases, the wavelength corresponding to the optimal antinode at different viewing angles undergoes a blue shift. Therefore, the wavelength with the optimal antinode at a positive viewing angle experiences a decrease in light extraction efficiency as the viewing angle increases, leading to a decrease in brightness at large viewing angles. For example, the peak wavelength light emitted by an OLED device has the optimal anti-node at a normal viewing angle, meaning that the light emission efficiency of the peak wavelength light emitted by the OLED device is the highest at a normal viewing angle. As the viewing angle increases, the light emission efficiency of the peak wavelength 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 other wavelength components increases. This causes the emission spectrum of the OLED device to change at a large viewing angle compared to a normal viewing angle, ultimately causing color shift problems.

[0068] A first aspect of this disclosure provides a display substrate for solving the aforementioned problems.

[0069] Figure 2 This is one of the schematic cross-sectional views of a display substrate provided in an embodiment of this disclosure.

[0070] In this embodiment of the disclosure, such as Figure 2 As shown, the display substrate includes a substrate 10 and pixel units 11.

[0071] 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 substrate 10 are adapted to the shape and size of the display substrate. Typically, substrate 10 can be square, rectangular, or other shapes. When applied to irregularly shaped displays, substrate 10 can also be circular or other irregularly shaped; no limitation is made here. Substrate 10 can be made of rigid materials, such as glass, to create a rigid display substrate. Alternatively, substrate 10 can be made of flexible materials, such as polyimide (PI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), etc., to create a flexible display substrate. Flexible substrate 10 can be a single-layer structure or a multi-layer structure. When substrate 10 is multi-layered, it can employ a stacked structure with alternating organic and inorganic film layers, where the inorganic film layers are located between adjacent organic film layers, acting as a buffer. The inorganic film layers can be made of silicon nitride (SiN). x ), silicon dioxide (SiO) x Single materials or composite materials, etc., are not limited here.

[0072] Pixel unit 11 is located on one side of substrate 10. Pixel unit 11 is used to emit light for image display. In specific implementations, the display substrate may include multiple 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 multiple pixel units for emitting different colors of light. For example, the display substrate may include red pixel units, green pixel units, and blue pixel units, which can emit light together during image display to achieve color display. The display substrate may also include only one color of pixel units for displaying monochrome images; this is not limited here. It should be noted that this disclosure uses a single pixel unit as an example to describe the specific structure of the display substrate.

[0073] like Figure 2As shown, 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. The first electrode 111 is typically the anode of the light-emitting device, and the second electrode 113 is typically the cathode of the light-emitting device. Alternatively, 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; this is not limited 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. 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 may 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) sequentially stacked along the direction from the first electrode 111 to the second electrode 1113. In specific implementations, the light-emitting functional layer 112 may also include other film layers set to achieve or improve specific functions; this is not limited 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 can also be a light-emitting device with a similar structure, such as a quantum dot light-emitting diode (QLED), etc., and is not limited here.

[0074] In this embodiment of the present disclosure, an optical microcavity is formed inside the pixel unit 11 through a first electrode 111, a light-emitting functional layer 112, and a 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, thereby reflecting the light emitted from the light-emitting functional layer 112 and improving the light utilization rate. Specifically, the first electrode 111 can be a thick metal electrode, such as a silver (Ag) electrode, a gold (Au) electrode, or a silver / gold (Ag / Au) composite electrode, to improve the reflectivity 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, semi-reflective material. For example, the second electrode 113 can be a thin metal electrode, such as a magnesium / silver (Mg / Ag) alloy, etc., without limitation, so that some light can pass through the second electrode 113 and be emitted to the outside of the light-emitting device for emission, while 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 consisting of a reflective conductive layer and a transparent conductive layer stacked together. For example, the first electrode 11 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. The metal layer has a large thickness to serve as a reflective conductive layer and improve reflectivity, while the ITO layer has a high work function to improve hole injection efficiency. When the first electrode 111 is a composite electrode consisting of a metal layer and a transparent metal oxide layer stacked together, the interface between the metal layer and the transparent metal oxide layer forms a reflective surface. The second electrode 113 is made of a semi-transparent, semi-reflective material. For example, the second electrode 113 may be a thin metal electrode, such as a magnesium / silver (Mg / Ag) alloy, etc., which is not limited here. Thus, some light can pass through the second electrode 113 and be emitted to the outside of the light-emitting device to emit light, while 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 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 and the light-emitting functional layer 112 in the first electrode 111.

[0077] 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. The specific material can be found in the foregoing description and will not be repeated here. Thus, 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 and has high transmittance, thereby forming a weak microcavity structure with the reflective surface of the first electrode 111. The length of the optical microcavity inside 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, such as in a bottom-emitting display substrate, the first electrode 111 of the light-emitting device can be made of a transparent material or a semi-transparent, 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 consisting of a reflective conductive layer and a transparent conductive layer stacked together; no limitation is made here. Specifically, the structure of the light-emitting device in the bottom-emitting display substrate can be obtained by inverting the structure of the light-emitting device in the top-emitting display substrate, and the cavity length of the optical microcavity inside the light-emitting device in the bottom-emitting display substrate can be referenced to the top-emitting display substrate.

[0079] In practice, the specific structure of the optical microcavity formed inside the pixel unit can vary depending on the specific film structure constituting the pixel unit, and is not limited here. By adjusting the cavity length of the optical microcavity, the light emitted from the light-emitting functional layer 122 can oscillate within the optical microcavity, resulting in constructive interference to improve the light extraction efficiency.

[0080] In this embodiment of the present disclosure, a pixel unit 11 includes multiple light-emitting regions. For the multiple light-emitting regions of the same pixel unit, the cavity length of the optical microcavity has multiple different values. Thus, under the same viewing angle, the light spectrum emitted from the light-emitting regions with different cavity lengths is different. Under a large viewing angle, optical compensation can be performed through multiple light-emitting regions to reduce the brightness attenuation and color shift caused by the change of viewing angle.

[0081] For example, such as Figure 2 As shown, for example, a single pixel unit may include a first light-emitting region S1, a second light-emitting region S2, and a third light-emitting region S3. Furthermore, for multiple light-emitting regions of the same pixel unit 11, the cavity length of the optical microcavity has multiple different values. For example, within the first light-emitting region S1 of pixel unit 11, the optical microcavity has a first cavity length L1; within the second light-emitting region S2 of pixel unit 11, the optical microcavity has a second cavity length L2; and within the third light-emitting region S3 of pixel unit 11, the optical microcavity has a third cavity length L3. It should be noted that... Figure 2In the embodiments shown, 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 this disclosure. The case when the optical microcavity formed inside the pixel unit 11 is of 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, under a frontal viewing angle, the coherent constructive wavelength of different light-emitting regions depends on the cavity length of the optical microcavity in that region. For example, if the cavity lengths of the optical microcavities of the first light-emitting region S1 and the third light-emitting region S3 are the same, then under a frontal viewing angle, the coherent constructive wavelengths of the first light-emitting region S1 and the third light-emitting region S3 are both the first wavelength λ1. The cavity length of the optical microcavity of the second light-emitting region S2 is less than that of the optical microcavity of the first light-emitting region S1, then the coherent constructive wavelength of the second light-emitting region S2 is the second wavelength λ2. The second wavelength λ2 is less 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, but the spectra of the light emitted from the first light-emitting region S1 and the third light-emitting region S3 are different from the spectra of the light emitted from the second light-emitting region S2. As the viewing angle increases, the coherent constructive wavelengths of the first emitting region S1, the second emitting region S2, and the third emitting region S3 gradually decrease. When the viewing angle increases to a specific viewing angle V2, the coherent constructive wavelengths of the first emitting region S1 and the third emitting region S3 just decrease to the size of the second wavelength λ2. Therefore, in specific designs, the peak wavelength of the light emitted by pixel unit 11 can be designed to be λ2. Then, under a frontal viewing angle, the light emitted by pixel unit 11 at its peak wavelength can undergo coherent constructive propagation within the second emitting region S2, thereby improving the light extraction efficiency and brightness at the frontal viewing angle. When the viewing angle increases to the specific viewing angle V2, the light emitted by pixel unit 11 at its peak wavelength can undergo coherent constructive propagation within the first emitting region S1 and the third emitting region S3, 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 from a specific viewing angle V2, the proportion of peak wavelengths in the emitted spectrum of pixel unit 11 is the same as or similar to the proportion of peak wavelengths in the emitted spectrum when viewed from a normal viewing angle, thereby overcoming the color shift problem at a specific viewing angle V2.

[0083] In specific implementation, the optical microcavities of the first light-emitting region S1 and the third light-emitting region S3 can be set to have different cavity lengths. The cavity length of the optical microcavity of the third light-emitting region S3 is smaller than that of the first light-emitting region S1 and larger than that of the second light-emitting region S3. Thus, at a certain intermediate viewing angle between the frontal viewing angle V1 and the specific viewing angle V2, the same effect of overcoming brightness attenuation and color shift can be achieved.

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

[0085] The above analysis shows that the more light-emitting areas a single pixel unit includes, and the more cavity lengths of the optical microcavities in the light-emitting areas within the same pixel unit, the more viewing angles can be compensated for brightness when viewed from a wide angle. Thus, by setting multiple light-emitting areas with different cavity lengths within the same pixel unit, brightness compensation can be achieved for multiple wide viewing angles, reducing brightness attenuation and color shift caused by changes in viewing angle.

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

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

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

[0089] The protrusion structure 13 is located within the pixel opening K1. The protrusion structure 13 includes a side surface 121 inclined relative to the substrate 10. The end of the side surface 121 closest to the substrate 10 is the bottom end 1211 of the protrusion structure 13, and the inner angle α formed by the side surface 121 and the substrate 10 is an acute angle. Specifically, the inner angle α formed by the side surface 121 and the substrate 10 refers to the angle formed by the side surface of the protrusion structure 13 and the substrate 10, and is located inside the protrusion 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 surface 121 of the protruding structure 13 and the area between the bottom ends 1211 of two adjacent protruding structures 13. 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 adjacent protruding structures 13 is 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.

[0091] Specifically, after fabricating a protrusion structure 13 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 protrusion structure 13 away from the substrate 10 by vapor deposition. During the vapor deposition process, since the area between the bottom ends 1211 of two adjacent protrusion structures 13 is relatively flat, and the side surface 121 forms a slope compared to the area between the bottom ends 1211 of two adjacent protrusion structures 13, the growth rate of the vapor-deposited film layer in the area between the bottom ends 1211 of two adjacent protrusion structures 13 is greater than the growth rate on the side surface 121. As a result, 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 adjacent protrusion structures 13 can be 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, respectively. 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 121 has a second thickness T2, with the first thickness T1 being greater than the second thickness T2.

[0092] In specific implementation, when the light-emitting functional layer 112 is formed on the side of the protrusion 13 facing away from the substrate 10 by vapor deposition, the thickness of the light-emitting functional layer 112 corresponding to the region between the bottom ends 1311 of adjacent protrusions 13 approximately satisfies the following relationship with the thickness of the light-emitting functional layer 112 corresponding to the side 131: T2 = T1 × cosα. The thickness of the first electrode 111 corresponding to the region between the bottom ends 1311 of adjacent protrusions 13, the thickness of the first electrode 111 corresponding to the side 131, and the thickness of the second electrode 113 corresponding to the region between the bottom ends 1311 of adjacent protrusions 13, the thickness of the second electrode 113 corresponding to the side 131 also approximately satisfies the above relationship, and will not be elaborated here. The inner angle α formed by the side 121 and the substrate 10 can be between 20° and 80°. By adjusting the size of the inner angle α formed by the side 121 and the substrate 10, the brightness and color shift problems at a specific viewing angle can be improved.

[0093] After fabricating a protrusion 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 fabricated on the side of the protrusion structure 13 away from the substrate 10 by vapor deposition. This allows the same pixel unit 11 to form light-emitting areas of different thicknesses in the area corresponding to the side 121 and in the area between the bottom ends 1211 of two adjacent protrusion structures 13. The optical microcavities formed by light-emitting areas of different thicknesses have different cavity lengths, which can compensate for the brightness of multiple large viewing angles and reduce the problems of brightness attenuation and color shift caused by changes in viewing angle.

[0094] Furthermore, by fabricating the first electrode 111 on the side of the protrusion structure 13 facing away from the substrate 10, the protruding surface of the protrusion structure 13 can significantly increase the area of ​​the first electrode 111. The effective light-emitting area of ​​the pixel unit 11 is typically proportional to the area of ​​the first electrode 111. Therefore, increasing the area of ​​the first electrode 111 helps to increase the aperture ratio and improve the brightness of the display panel. And according to the formula for the luminous intensity of a 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 magnitude, S represents the area of ​​the pixel aperture, and R represents the aperture ratio. This represents current density. Higher current density shortens the lifespan of a pixel unit. As shown in the equation above, at the same brightness, increasing the aperture ratio R helps reduce the current density. Increase the lifespan of pixel units; conversely, while ensuring the pixel lifespan remains unchanged, i.e., increase the current density. When the value remains unchanged, it is beneficial to improve the brightness of the light.

[0095] Figure 4 This is the third schematic diagram of the cross-sectional structure of the display substrate provided in the embodiments of this disclosure.

[0096] In some embodiments, such as Figure 4 As shown, the first electrode 111 also covers part of the sidewall 121 of the pixel limiting 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 in the embodiments of this disclosure.

[0098] In some embodiments, such 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 the light rays of two adjacent pixel units.

[0099] In some embodiments, the protrusion structure 13 and the pixel defining layer 12 can be disposed on the same layer. Specifically, the protrusion structure 13 and the pixel defining layer 12 being disposed on the same layer means that the protrusion structure 13 and the pixel defining layer 12 can be formed in the same mask process by etching the same film layer, thereby reducing etching processes and improving manufacturing efficiency. In a specific implementation, a driving circuit layer is also disposed between the pixel defining layer 12 and the substrate 10, and the driving circuit layer is provided with pixel circuits (not shown in the figure) for driving the pixel unit 11. After the protrusion structure 13 and the pixel defining layer 12 are fabricated, vias (not shown in the figure) for connecting the first electrode 111 and the pixel circuit can be formed in the area of ​​the pixel opening K1. Then, the first electrode 111, the light-emitting functional layer 112, and the second electrode 113 are sequentially deposited in the pixel opening K1, wherein the first electrode is connected to the pixel circuit through the vias. In a specific implementation, the fabrication can be carried out according to the specific structure of the display substrate and with reference to related technologies, which will not be elaborated here.

[0100] In some embodiments, the protrusion structure 13 and the pixel defining layer 12 may also be disposed in different film layers. For example, in specific fabrication, the protrusion structure 13 can be fabricated first 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 can be formed; then the first electrode 111 can be fabricated on the side of the protrusion structure 13 facing away from the driving circuit layer, and the first electrode 111 is connected to the pixel circuit through the via; then, referring to related technologies, the pixel defining layer 12 is fabricated on the side of the first electrode 111 facing away from the substrate 10, and a pixel opening K1 is formed in the pixel defining layer 12 to expose the first electrode 111, and the light-emitting functional layer 112 and the second electrode 113 are sequentially deposited in the pixel opening K1. In specific implementation, the fabrication can be carried out according to the specific structure of the display substrate and with reference to related technologies, which will not be elaborated here.

[0101] Figure 6 This is the fifth schematic diagram of the cross-sectional structure of the display substrate provided in the embodiments of this disclosure.

[0102] In some embodiments, such as Figure 6 As shown, multiple protruding structures 13 are provided within the same pixel opening K1. In specific implementations, the protruding structures 13 within the same pixel opening K1 can be designed to have the same three-dimensional shape and size, thereby reducing the difficulty of mask design and display substrate fabrication. Specifically, the multiple protruding structures 13 having the same three-dimensional shape and size means that the multiple protruding structures 13 have the same type of three-dimensional shape, such as frustum, truncated cone, or pyramid, and have the same size. Figure 6As shown, the shape and size of the protrusion 13 mainly depend on the size of the inner angle α formed by 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 and the top end of the protrusion 13, where the top end of the protrusion 13 is the end of the side surface 131 furthest 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 on a cross-section of the protrusion 13 in a specific direction. This specific direction is perpendicular to the substrate 10 and passes through the geometric center of the pattern formed by the orthographic projection of the bottom end 1311 of the protrusion 13 onto the substrate 10. It should be noted that this specific direction can be any direction; when comparing the widths W1 of the bottom ends of multiple protrusions 13, it is sufficient to take the same direction for all protrusions 13. In specific implementation, the multiple protrusions 13 have the same size. Specifically, the multiple protrusions 13 can be configured such that the inner angle α formed by the side surface 131 of the multiple protrusions 13 and the substrate 10 is the same, the height of the multiple protrusions 13 is the same, and the width W1 of the bottom end of the multiple protrusions 13 is the same.

[0103] In some embodiments, such as Figure 6 As shown, it is also possible to configure multiple protrusions 13 arranged in any direction within the same pixel opening K1, such that the distance W2 between the bottom ends 1311 of any two adjacent protrusions 13 is the same, thereby reducing the difficulty of mask design and display substrate fabrication. It should be noted that, in the embodiments of this disclosure, multiple protrusions 13 arranged in any direction specifically refers to the geometric centers of the orthographic projection shapes of the bottom ends of the multiple protrusions 13 onto the substrate 10 being located or approximately located on the same straight line, and the extension direction of this straight line is the arrangement direction of the multiple protrusions 13.

[0104] In some embodiments, multiple protrusion structures are provided within the same pixel opening, and within the same pixel opening, the inner angle formed by the side of the protrusion structure and the substrate has multiple different values. Specifically, the inner angle formed by the side of the protrusion structure and the substrate within the same pixel opening having multiple different values ​​may include the case where, for the same protrusion structure, the inner angle formed by the side of the protrusion structure and the substrate has multiple different values, and / or the case where, for different protrusion structures, the inner angle formed by the side of different protrusion structures and the substrate at corresponding positions has multiple different values. The specific situations will be described in detail later. By setting the protrusion structure within the same pixel opening, the inner angle formed between the side of the protrusion and the substrate can have multiple different values. According to the aforementioned film thickness relationship formula: T2 = T1 × cosα, for multiple sides forming different inner angles with the substrate, the film thicknesses of the first electrode, the light-emitting functional layer, and the second electrode formed on these multiple sides are all different. This allows for the formation of multiple light-emitting regions with different thicknesses on these multiple sides. The cavity length of the optical microcavities formed within each light-emitting region is different, which is beneficial for compensating for the luminous brightness of the display substrate from more viewing angles, further reducing the brightness attenuation and color shift problems caused by viewing angle changes. The more values ​​the inner angle formed between the side of the protrusion structure and the substrate within the same pixel opening has, the more significant the improvement in brightness attenuation and color shift problems at different viewing angles.

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

[0106] In some embodiments, for at least one protrusion structure disposed within the same pixel opening, the inner angle formed by the side surface of the protrusion structure and the substrate at multiple positions around the protrusion structure has multiple different values ​​corresponding to the multiple positions. For example, such as Figure 7 As shown, the shape of the protrusion structure can be a truncated quadrangular pyramid. The sides of the protrusion structure are divided into a first side 131A, a second side 131B, a third side 131C, and a fourth side 131D, corresponding to the four sides of the quadrilateral. Around the protrusion structure, the inner angles formed by the first side 131A, the second side 131B, the third side 131C, and the fourth side 131D with the substrate are all different. Figure 8 for Figure 7 A cross-sectional view along section line AA, specifically, as follows: 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. The first value α1 is less than the second value α2. When the shape of the protrusion structure is other than α1, the same principle can be applied. Figure 7and Figure 8 The illustrated embodiment uses a similar setup, which will not be described in detail here. In specific implementation, the same pixel opening has... Figure 7 and Figure 8 The specific number or proportion of the protrusions in the illustrated embodiment can be adjusted according to the actual situation, and is not limited here.

[0107] Figure 9 This is the sixth schematic diagram of the cross-sectional structure of the display substrate provided in the embodiments of this disclosure.

[0108] In some embodiments, for multiple protrusions disposed within the same pixel opening, the value of the inner angle formed between the side of any protrusion and the substrate at a predetermined position is different from the value of the inner angle formed between the side of at least one other protrusion and the substrate at a corresponding position. For example, such as Figure 9 As shown, the multiple protrusion structures provided within the same pixel opening K1 include a first protrusion structure 13A and a second protrusion structure 13B. The inner angle formed between the side of the first protrusion structure 13A and the substrate 10 at a set position is a first value α1, and the inner angle formed between the side of the second protrusion structure 13B and the substrate 10 at the corresponding position is a second value α2. The first value α1 is less than the second value α2. The orthographic projection of the first protrusion structure 13A onto the substrate 10 is located at a first point. The geometric center of the orthographic projection of the bottom end of the first protrusion structure 13A onto the substrate 10 is located at a second point. The orthographic projection of the corresponding position of the second protrusion structure 13B onto the substrate 10 is located at a third point. The geometric center of the orthographic projection of the bottom end of the second protrusion structure 13B onto the substrate 10 is located at a fourth point. The line connecting the third and fourth points is parallel or approximately parallel to the line connecting the second and first points. The direction from the second point to the first point is the same as 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 the embodiments of this disclosure.

[0110] In some embodiments, for multiple protrusions disposed within the same pixel opening, at least two of the protrusions may be configured to have different heights. For example, such as Figure 10As shown, multiple protruding structures within the same pixel opening include a first protruding structure 13A and a third protruding structure 13B. The first protruding structure 13A has a first height H1, and the third protruding structure 13B has a second height H2, with the second height H2 being greater than the first height H1. By adjusting the height of the protruding structures, the area of ​​the side surface of the protruding structure can be adjusted, thereby further adjusting the luminous brightness of the corresponding light-emitting area on the side surface of the protruding structure. In specific implementations, the heights of the multiple protruding structures within the same pixel opening do not need to be all the same; instead, the heights of each protruding structure can be adjusted individually, thereby making the luminous brightness of the display substrate more uniform across different viewing angles. The specific implementation can be adjusted according to the specific structure of the display substrate, and is not limited here.

[0111] In some embodiments, for multiple protrusions disposed within the same pixel opening, the distance between the bottom ends of at least some adjacent protrusions arranged along a predetermined direction may be different. For example, such as Figure 10 As shown, multiple protruding structures disposed in the same pixel opening K1 include a first protruding structure 13A, a second protruding structure 13B, and a third protruding structure 13C. The first protruding structure 13A, the second protruding structure 13B, and the third protruding structure 13C are arranged along a predetermined direction and are adjacent to each other. The predetermined direction can be any direction. Specifically, the arrangement of the first protruding structure 13A, the second protruding structure 13B, and the third protruding structure 13C along the predetermined direction means that the geometric centers of the orthographic projections of the bottom ends of the first protruding structure 13A, the second protruding structure 13B, and the third protruding structure 13C onto the substrate are all located or approximately located on the same straight line extending along the predetermined direction. Figure 10 As shown, a first distance W3 can be provided between the bottom ends of the first protrusion structure 13A and the second protrusion structure 13B along a predetermined direction, and a second distance W4 can be provided between the bottom ends of the second protrusion structure 13B and the third protrusion structure 13C, wherein the first distance W3 is smaller than the second distance W4. By adjusting the distance 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 luminous brightness of the light-emitting region located between the bottom ends of adjacent protrusion structures to achieve a more uniform luminous brightness of the display substrate from various viewing angles. In specific implementation, adjustments can be made according to the specific structure of the display substrate, and no limitations are imposed here.

[0112] In some embodiments, such as Figure 10As shown, for multiple protrusion structures disposed within the same pixel opening K1, at least some of the protrusion structures are frustum-shaped, and the frustum-shaped protrusion structure also 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 is connected to the side surface 131. Figure 10 and Figure 3 As shown, the first electrode 111 also covers the top surface 132 of the protrusion structure 13. In specific implementations, the widths of the top surfaces 132 of at least some of the protrusion structures within the same pixel opening K1 can be set to be different in a set direction. For example, as Figure 10 As shown, multiple protruding structures are provided within the same pixel opening K1, including a first protruding structure 13A and a fourth protruding structure 13D. Both the first protruding structure 13A and the fourth protruding structure 13D are frustum-shaped protruding structures. The top surface of the first protruding structure 13A has a first width W5 in a set direction, and the top surface of the fourth protruding structure 13D has a second width W6 in the set direction. 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 protruding structure 13A and the fourth protruding structure 13D are measured along the same set direction. When measuring the top surface width of the first protruding structure 13A, the measurement must be taken along the set direction and through the geometric center of the top surface of the first protruding structure 13A. Similarly, when measuring the top surface width of the fourth protruding structure 13D, the measurement must be taken along the set direction and through the geometric center of the top surface of the fourth protruding structure 13D. By adjusting the width of the top surface of the raised structure, the area of ​​the corresponding light-emitting region can be adjusted, thereby adjusting the brightness of the light-emitting region and achieving a more uniform brightness of the display substrate from various viewing angles. In practice, adjustments can be made according to the specific structure of the display substrate, and no specific limitations are imposed here.

[0113] In specific implementations, the shape of the frustum-shaped protrusions within the same pixel opening K1 can be at least one of a frustum of a cylinder or a frustum of a prism, and the frustum can be a triangular frustum, a quadrangular frustum, a pentagonal frustum, etc., without limitation. For example, the shape of the frustum-shaped protrusions within the same pixel opening K1 can be entirely frustum of a cylinder, entirely frustum of a prism, or partially frustum of a cylinder and partially frustum of a prism, without limitation. In some embodiments, the shape of the frustum-shaped protrusions can also include other frustum-shaped structures, without limitation.

[0114] In summary, when the protrusion structure is frustum-shaped, the brightness of the pixel unit under different viewing angles can be adjusted by changing the size of the inner angle formed by the side of the protrusion structure and the substrate, the height of the protrusion structure, the width of the top surface of the protrusion structure, and the spacing between the bottom ends of adjacent protrusion structures. This ultimately improves the brightness attenuation and color shift of the display substrate under different viewing angles.

[0115] Figure 11 This is the eighth schematic diagram of the cross-sectional structure of the display substrate provided in the embodiments of this disclosure.

[0116] In some embodiments, for multiple protrusions disposed within the same pixel opening K1, at least some of the protrusions are tapered in shape. For example... Figure 11 As shown, the end of the side 131 facing away from the substrate 10 is the top end 1312 of the protrusion structure. The side 131 of the conical protrusion structure converges at the top end 1312 to form a cone shape.

[0117] In specific implementation, the shape of the conical protrusion structure provided within the same pixel opening K1 can be at least one of a cone or a pyramid, and the pyramid can be a triangular pyramid, a square pyramid, a pentagonal pyramid, etc., without limitation. For example, the shape of the conical protrusion structure provided within the same pixel opening K1 can be entirely conical, entirely pyramidal, or partially conical with the remaining part being pyramidal, without limitation. In some embodiments, the shape of the conical protrusion structure can also include other conical structures, without limitation. When the shape of the protrusion structure is conical, the luminous brightness of the pixel unit under 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 distance between the bottom ends of adjacent protrusion structures, thereby improving the brightness attenuation and color shift problems of the display substrate under different viewing angles.

[0118] In some embodiments, such as Figure 10 As shown, multiple protrusion structures within the same pixel opening K1 can all be configured as frustum-shaped structures. In some embodiments, such as Figure 11 As shown, all the protruding structures within the same pixel opening K1 can be configured as conical structures. In some embodiments, a portion of the multiple protruding structures within the same pixel opening K1 can be configured as frustum-shaped structures, while the remaining portions can be configured as conical structures; this is not limited here.

[0119] Figure 12 This is the ninth schematic diagram of the cross-sectional structure of the display substrate provided in the embodiments of this disclosure.

[0120] In some embodiments, such as Figure 12As shown, the display substrate also includes a pixel defining layer 12. The pixel defining layer 12 is located on one side of the substrate 10. A first electrode 111 is located between the pixel defining layer 12 and the substrate 10. In specific 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 multiple 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 within the same pixel region P constitute the pixel unit 11 corresponding to that pixel region P. Multiple openings K are formed within one pixel region P, and adjacent openings K are separated by the pixel defining layer. Each opening K exposes the first electrode 111 of the pixel unit 11 corresponding to that 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 within each light-emitting region are disposed in the corresponding opening K. In a specific implementation, the light-emitting functional layer 112 can be filled into the opening K by inkjet printing or other methods. 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 enabling multiple light-emitting regions of the same pixel unit 11 to have multiple different values ​​for the cavity length of the optical microcavity.

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

[0123] Figure 13 This is the tenth schematic diagram of the cross-sectional structure of the display substrate provided in the embodiments of this disclosure.

[0124] In some embodiments, such 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 can directly contact 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, multiple openings K can be provided, and the thickness of the transparent conductive layer 111B exposed can have multiple different values. For example, such as... 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. Thus, by adjusting the thickness of the light-emitting functional layer 112, the cavity length of the optical microcavity in each light-emitting region can be adjusted.

[0125] In practice, the thickness of the light-emitting functional layer 112 or the thickness of the transparent conductive layer 111B can be adjusted individually, 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 microcavities formed in different openings. No limitation is made here.

[0126] In specific implementations, the display substrate provided in this disclosure may also include other structures not mentioned in the foregoing embodiments but necessary to achieve specific functions, which will not be elaborated here. The specific structure of the display substrate provided in this disclosure may also be adjusted according to actual conditions without departing from the intent of this disclosure, and is not limited here.

[0127] A second aspect of this disclosure also provides a display device. The display device provided in the embodiments of this disclosure includes the display substrate provided in any of the foregoing embodiments. In specific implementations, the display device provided in the embodiments of this disclosure has the same or similar technical effects as any of the foregoing embodiments, and will not be described in detail here. The display device provided in the embodiments of this disclosure can specifically be: a mobile phone, a tablet computer, a laptop computer, a display, a monitor, etc., and is not limited thereto.

[0128] Although preferred embodiments of this disclosure have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this disclosure.

[0129] Obviously, those skilled in the art can make various modifications and variations to this disclosure without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims of this disclosure and their equivalents, this disclosure is also intended to include such modifications and variations.

Claims

1. A display substrate, wherein, include: Substrate; Pixel units are located on one side of the substrate; At least one of the pixel units includes: The first electrode is located on one side of the substrate; A light-emitting functional layer is located on the side of the first electrode opposite to the substrate; The second electrode is located on the side of the light-emitting functional layer opposite to 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, and for the multiple light-emitting regions of the same pixel unit, the cavity length of the optical microcavity has multiple different values.

2. The display substrate as claimed in claim 1, wherein, The display substrate further includes: A pixel defining layer is located on one side of the substrate; the pixel defining layer has a pixel opening; the pixel unit is located in the pixel opening; A raised structure is located within the pixel opening; the raised structure includes a side surface that is inclined relative to the substrate, the end of the side surface near the substrate being the bottom end of the raised structure, and the 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 surface of the protruding structure and the area between the bottom ends of adjacent protruding structures.

3. The display substrate as described in claim 1, wherein, 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 protrusions are greater than the thicknesses of the first electrode, the light-emitting functional layer, and the second electrode corresponding to the side surface.

4. The display substrate as described in claim 2 or 3, wherein, The thickness of the light-emitting functional layer corresponding to the region between the bottom ends of adjacent protrusions satisfies the following condition as well as the thickness of the light-emitting functional layer corresponding to the side surface: T2 = T1 × cosα; Where T1 represents the thickness of the light-emitting functional layer corresponding to the region between the bottom ends of adjacent protrusions, 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 any one of claims 2 to 4, wherein, Multiple protrusion structures are provided within the same pixel opening; The protrusions within the same pixel opening have the same three-dimensional shape and size; In any of the multiple protrusions arranged in any direction within the same pixel opening, the distance between the bottom ends of any two adjacent protrusions is the same.

6. The display substrate according to any one of claims 2 to 4, wherein, Multiple protrusion structures are provided within the same pixel opening; Within the same pixel opening, the inner angle formed by the side of the protrusion structure and the substrate has multiple different values.

7. The display substrate as claimed in claim 6, wherein, For at least one protrusion structure disposed within the same pixel opening, at multiple locations around the protrusion structure, the inner angle formed by the side of the protrusion structure and the substrate has multiple different values ​​corresponding to the multiple locations.

8. The display substrate as claimed in claim 6 or 7, wherein, For multiple protrusions disposed within the same pixel opening, the value of the inner angle formed between the side of any protrusion and the substrate at a set position is different from the value of the inner angle formed between the side of at least one other protrusion and the substrate at a corresponding position.

9. The display substrate according to any one of claims 6 to 8, wherein, For multiple protrusion structures disposed within the same pixel opening, at least two of the protrusion structures have different heights.

10. The display substrate according to any one of claims 6 to 8, wherein, For multiple protrusions disposed within the same pixel opening, among the multiple protrusions arranged along a set direction, at least some of the bottom ends of adjacent protrusions are at different distances.

11. The display substrate according to any one of claims 6 to 10, wherein, For multiple protrusion structures disposed within the same pixel opening, at least some of the protrusion structures are tapered in shape; The end of the side facing away from the substrate is the top of the protrusion structure, and the side surfaces converge at a point at the top.

12. The display substrate according to any one of claims 6 to 10, wherein, For multiple protrusion structures disposed within the same pixel opening, at least some of the protrusion structures are frustum-shaped; the frustum-shaped protrusion structure also includes a top surface parallel to the substrate; the top surface is located at the end of the side surface away from the substrate and is connected to the side surface; The first electrode also covers the top surface of the protrusion structure; at least a portion of the top surface of the protrusion structure has a different width in a given direction.

13. The display substrate according to any one of claims 2 to 12, wherein, The first electrode also covers a portion of the sidewall of the pixel defining layer.

14. The display substrate according to any one of claims 2 to 12, wherein, The first electrode does not contact the sidewall of the pixel defining layer.

15. The display substrate according to any one of claims 2 to 14, wherein, The protruding structure is located on the same layer as the pixel defining layer.

16. The display substrate according to any one of claims 2 to 15, wherein, For any of the protrusion structures, the inner angle formed by the side surface and the substrate is between 20° and 80°.

17. The display substrate as claimed in 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 regions, one pixel region corresponds to one pixel unit, and multiple openings are formed in one pixel region, the openings exposing the corresponding first electrode; one opening corresponds to a light-emitting region of the pixel unit, and the light-emitting functional layer and the second electrode in each light-emitting region are disposed in the corresponding opening.

18. The display substrate as claimed in claim 17, wherein, For the same pixel region, the thickness of the light-emitting functional layer within the multiple openings has multiple different values.

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

20. A display device, wherein, Includes the display substrate as described in any one of claims 1 to 19.

Images