Display substrate and display device

Abstract

The present disclosure provides a display substrate and a display device. The display substrate comprises: a substrate; a color filter layer, located on the substrate; and a light extraction portion, located on the side of the color filter layer facing away from the substrate and completely coating the color filter layer. The light extraction portion comprises a first light extraction layer and a second light extraction layer which are sequentially arranged in a direction away from the substrate. Compared to a plane parallel to the substrate, the surface of the first light extraction layer facing away from the substrate is configured as a curved surface. The refractive index of the first light extraction layer is greater than the refractive index of the second light extraction layer.

Description

A display substrate and a display device Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a display substrate and a display device. Background Technology

[0002] Low-cost, high-efficiency micro light-emitting diode (Micro LED) display technology is the way to realize next-generation ultra-high-definition displays and full-color flexible displays.

[0003] Color conversion schemes are widely used in the LED display field, reducing the massive transfer of red and green light and solving the problem of low red light efficiency. Moreover, due to the limitations of massive transfer, the number of transfer bonding operations and the difficulty of repair for monochrome chips are far lower than those for three-color chips.

[0004] However, due to the photoexcitation characteristics of color conversion materials, increasing the blue light absorption rate will add a large number of scattering particles, which will cause the light emitted by the blue chip to be greatly scattered after passing through the color conversion layer, resulting in a decrease in the intensity of the forward light output.

[0005] Summary of the Invention

[0006] This disclosure provides a display substrate and a display device, the specific solutions of which are as follows:

[0007] This disclosure provides a display substrate, comprising:

[0008] Substrate;

[0009] The color filter layer is located on the substrate;

[0010] The light-collecting part is located on the side of the color filter layer away from the substrate and completely covers the color filter layer; the light-collecting part includes a first light-collecting layer and a second light-collecting layer disposed sequentially away from the substrate. Compared with the plane parallel to the substrate, the surface of the first light-collecting layer away from the substrate is curved, and the refractive index of the first light-collecting layer is greater than the refractive index of the second light-collecting layer.

[0011] Optionally, in this embodiment of the present disclosure, the curved surface includes a plurality of protrusions and a plurality of recesses along the direction from the second light-collecting layer to the first light-collecting layer and perpendicular to the plane of the substrate, with each of the protrusions and recesses arranged alternately.

[0012] Optionally, in an embodiment of this disclosure, the color filter layer includes a light-shielding portion and a plurality of light-filtering portions surrounded by the light-shielding portion, the recessed structure is disposed corresponding to the light-filtering portion, and the raised structure is disposed corresponding to the light-shielding portion.

[0013] Optionally, in this embodiment of the present disclosure, the side surface of the second light-collecting layer facing away from the substrate is parallel to the plane of the substrate, and the thickness of the second light-collecting layer at the corresponding position of the recessed structure is greater than the thickness at the corresponding position of the protruding structure.

[0014] Optionally, in this embodiment of the present disclosure, the distance between the side surface of the light-shielding portion facing away from the substrate and the substrate is greater than the distance between the side surface of the light-filtering portion facing away from the substrate and the substrate.

[0015] Optionally, in this embodiment of the disclosure, the light-shielding part is a black matrix.

[0016] Optionally, in this embodiment of the disclosure, the light-shielding part is a composite structure made of two different colored pigments stacked together.

[0017] Optionally, in this embodiment of the present disclosure, the distance between the side surface of the first light-collecting layer facing away from the substrate and the side surface of the light-shielding portion facing away from the substrate is greater than 1.0 μm.

[0018] Optionally, in this embodiment of the disclosure, the thickness of the second light-collecting layer is greater than 1.0 μm and less than 2.0 μm.

[0019] Optionally, in this embodiment of the present disclosure, a plurality of color conversion units are located on the side of the second light-collecting layer away from the substrate, and each of the color conversion units is disposed corresponding to the filter section.

[0020] Optionally, in this embodiment of the present disclosure, a blocking unit is further included surrounding the plurality of color conversion units, the thickness of the blocking unit being greater than the thickness of the color conversion units, and the blocking unit being disposed correspondingly to the light-shielding portion.

[0021] Accordingly, embodiments of this disclosure provide a display device, comprising:

[0022] The display substrate as described in any of the above, and the drive backplate electrically connected to the display substrate.

[0023] Optionally, in this embodiment of the present disclosure, a plurality of light-emitting devices are further included between the display substrate and the driving backplate. The plurality of light-emitting devices are electrically connected to the driving backplate, and each of the light-emitting devices is correspondingly disposed with respect to a recessed structure in the curved surface. The curved surface includes a plurality of protruding structures and a plurality of recessed structures along the direction from the second light-collecting layer to the first light-collecting layer and perpendicular to the plane where the substrate is located. The protruding structures and the recessed structures are arranged alternately.

[0024] Optionally, in the embodiments of this disclosure, each of the light-emitting devices includes a first electrode, an epitaxial layer, and a second electrode disposed sequentially away from the substrate, and the light-emitting devices of the same color are connected in series through corresponding electrodes.

[0025] Optionally, in this embodiment of the present disclosure, a reflective structure is further included around the light-emitting device, the reflective structure including a main body and a metal reflective layer disposed on the sidewall of the main body near the light-emitting device.

[0026] Optionally, in this embodiment of the disclosure, each of the light-emitting devices is electrically connected to the driving backplane via a flip-chip connection.

[0027] Optionally, in this embodiment of the present disclosure, an anode layer, a light-emitting functional layer, and a cathode layer are disposed sequentially away from the substrate; the anode layer corresponding to each of the light-emitting devices is disposed intermittently, and the light-emitting functional layer and the cathode layer are disposed as a whole layer. Attached Figure Description

[0028] Figure 1 is a schematic diagram of one type of light in the related technology;

[0029] Figure 2 is a schematic diagram of one structure of a display substrate provided in an embodiment of this disclosure;

[0030] Figure 3 is a schematic diagram of one structure of the display substrate provided in an embodiment of this disclosure;

[0031] Figure 4 is a process flow diagram of one of the processes for preparing the display substrate shown in Figure 2;

[0032] Figure 5 is a schematic diagram of one structure of the display device provided in an embodiment of this disclosure;

[0033] Figure 6 is a schematic diagram of one structure of the driving backplate in the display device provided in the embodiments of this disclosure;

[0034] Figure 7 is a schematic diagram of one of the structures based on the display substrate shown in Figure 3 and the driving backplate shown in Figure 6;

[0035] Figure 8 is a schematic diagram of one of the structures based on the display substrate shown in Figure 2 and the driving backplate shown in Figure 6;

[0036] Figure 9 is a schematic diagram of one structure of the display device provided in an embodiment of this disclosure;

[0037] Figure 10 is a schematic diagram of one structure of a display device provided in an embodiment of the present disclosure;

[0038] Figure 11 is a schematic diagram of one structure of the display device provided in the embodiments of this disclosure. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Furthermore, the embodiments and features in the embodiments of this disclosure can be combined with each other without conflict. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0040] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “inner,” “outer,” “upper,” and “lower” are used only to indicate relative positional relationships; when the absolute position of the described objects changes, the relative positional relationship may also change accordingly.

[0041] It should be noted that the dimensions and shapes of the figures in the accompanying drawings do not reflect actual proportions and are intended only to illustrate the content of this disclosure. Furthermore, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0042] Among related technologies, RGB (red, green, blue) chips have the highest efficiency and lowest cost, while R LEDs have the highest manufacturing difficulty and cost. This allows for the use of B LEDs and color conversion structures to achieve full-color processing, reducing the massive red-green transfer and solving the problems of low red light efficiency and high manufacturing difficulty. However, due to the photoexcitation characteristics of the color conversion material, increasing the blue light absorption rate adds a large number of scattering particles. This causes the light emitted from the blue chip to be significantly scattered at different angles after passing through the color conversion layer, resulting in a decrease in the forward light intensity.

[0043] As shown in Figure 1, the light intensity decreases significantly at the center angle after the light passes through the color conversion layer from the blue chip. In this figure, ① represents the light emitted directly from the blue chip, and ② represents the light emitted from the blue chip after passing through the red light conversion layer. Furthermore, existing color conversion layers can be made of CdSe or InP materials. CdSe materials have high light conversion efficiency but contain heavy metals and cannot be used commercially. InP materials are pollution-free, but have lower light conversion efficiency and blue light absorption, typically requiring a film thickness greater than 10 μm to meet basic requirements. Therefore, improving light extraction efficiency has become an urgent technical problem to be solved.

[0044] In view of this, the present disclosure provides a display substrate and a display device for achieving high-efficiency light extraction.

[0045] As shown in Figure 2, this embodiment of the present disclosure provides a display substrate, specifically, the display substrate includes:

[0046] Substrate 10;

[0047] Color filter layer 20 is located on the substrate 10;

[0048] The light-collecting part 30 is located on the side of the color filter layer 20 away from the substrate 10 and completely covers the color filter layer 20. The light-collecting part 30 includes a first light-collecting layer 31 and a second light-collecting layer 32 disposed sequentially away from the substrate 10. Compared with the plane parallel to the substrate 10, the surface of the first light-collecting layer 31 away from the substrate 10 is curved, and the refractive index of the first light-collecting layer 31 is greater than the refractive index of the second light-collecting layer 32.

[0049] In specific implementation, the display substrate provided in this embodiment includes a substrate 10, a color filter layer 20, and a light-collecting portion 30. Exemplarily, the substrate 10 can be a rigid substrate, such as a glass substrate or a silicon-based substrate. Exemplarily, the substrate 10 can also be a flexible substrate. Of course, the substrate 10 can be made of any material required for the actual application, and this is not limited here. Furthermore, the color filter layer 20 is located on the substrate 10 and is configured to filter light of the desired color. In addition, the light-collecting portion 30 is located on the side of the color filter layer 20 facing away from the substrate 10 and completely covers the color filter layer 20. The light-collecting portion 30 includes a first light-collecting layer 31 and a second light-collecting layer 32 sequentially disposed facing away from the substrate 10. Compared to a plane parallel to the substrate 10, the surface of the first light-collecting layer 31 facing away from the substrate 10 is curved, and correspondingly, the surface of the first light-collecting layer 31 facing away from the substrate 10 is not planar. Moreover, the refractive index of the first light-collecting layer 31 is greater than the refractive index of the second light-collecting layer 32. For example, the refractive index of the first light-collecting layer 31 is 1.7, and the refractive index of the second light-collecting layer 32 is 1.4. Of course, the specific values ​​of the refractive indices of the first and second light-collecting layers 31 can be set according to actual application needs and are not limited here. In this way, when light enters the first light-collecting layer 31 from the second light-collecting layer 32, the curved surface of the first light-collecting layer 31 facing away from the substrate 10, and the difference in refractive index between the first and second light-collecting layers 31 and 32, cause the large-angle light path to be deflected, which can improve the forward light intensity to a certain extent, thereby improving the light-collecting efficiency.

[0050] In this embodiment of the disclosure, along the direction from the second light-collecting layer 32 to the first light-collecting layer 31 and perpendicular to the plane of the substrate 10, the curved surface includes a plurality of protrusion structures 40 and a plurality of recessed structures 50, with each of the protrusion structures 40 and each of the recessed structures 50 arranged alternately.

[0051] In the exemplary embodiment shown in Figure 2, the direction indicated by arrow X is the direction from the second light-collecting layer 32 to the first light-collecting layer 31, and perpendicular to the plane of the substrate 10. Along this direction, the curved surface includes a plurality of protrusions 40 and a plurality of recesses 50. Exemplarily, the number of protrusions 40 can be two, or three or more. The number of recesses 50 can also be two, or three or more. Of course, the specific number of protrusions 40 and recesses 50 can be set according to actual application needs and is not limited here. Moreover, the protrusions 40 and recesses 50 are arranged alternately, thus providing various possibilities for adjusting the light angle.

[0052] In this embodiment of the present disclosure, the color filter layer 20 includes a light-shielding portion 21 and a plurality of light-filtering portions 22 surrounded by the light-shielding portion 21. The recessed structure 50 is disposed corresponding to the light-filtering portions 22, and the raised structure 40 is disposed corresponding to the light-shielding portion 21.

[0053] In the exemplary embodiment shown in FIG2, the color filter layer 20 includes a light-shielding portion 21 and a plurality of light-filtering portions 22 surrounded by the light-shielding portion 21. Exemplarily, the plurality of light-filtering portions 22 are arranged in an array. Exemplarily, the plurality of light-filtering portions 22 can be two, or three or more; of course, the number of the plurality of light-filtering portions 22 can be set according to actual application needs, and is not limited here. Furthermore, the color of each light-filtering portion 22 can be the same as the desired color of the light-emitting sub-pixel. In one exemplary embodiment, the light-emitting pixel includes a red light-emitting sub-pixel, a green light-emitting sub-pixel, and a blue light-emitting sub-pixel. The light-filtering portion 22 corresponding to the red light-emitting sub-pixel can be a red light-filtering portion to obtain the desired red light; the light-filtering portion 22 corresponding to the green light-emitting sub-pixel can be a green light-filtering portion to obtain the desired green light; and the light-filtering portion 22 corresponding to the blue light-emitting sub-pixel can be a blue light-filtering portion to obtain the desired blue light. This improves the contrast of the display substrate.

[0054] Referring again to the exemplary embodiment shown in FIG2, the recessed structure 50 is provided corresponding to the light filter portion 22, and the raised structure 40 is provided corresponding to the light shielding portion 21. In this way, even if some of the light entering the first light-collecting layer 31 through the second light-collecting layer 32 is dispersed towards the light shielding portion 21, it can be reflected by the raised structure 40 to directly above the light filter portion 22, thereby improving the light-collecting efficiency of the display substrate.

[0055] It should be noted that in the exemplary embodiment shown in Figure 2, arrows other than arrow X represent the transmission paths of the relevant light rays. Of course, there are many other types of light rays, which are not all shown here.

[0056] In this embodiment of the present disclosure, the side surface of the second light-collecting layer 32 facing away from the substrate 10 is parallel to the plane of the substrate 10, and the thickness of the second light-collecting layer 32 at the corresponding position of the recessed structure 50 is greater than the thickness at the corresponding position of the protruding structure 40.

[0057] In the specific implementation process, the surface of the second light-collecting layer 32 facing away from the substrate 10 is parallel to the plane of the substrate 10. In the actual preparation process, a coating process can be used to form the first light-collecting layer 31 on the side of the color filter layer 20 facing away from the substrate 10. Since the surface of the first light-collecting layer 31 facing away from the substrate 10 is curved, a highly flat transparent organic material can be used to coat and form the second light-collecting layer 32. For example, the transparent organic material can be a polysiloxane, a polysiloxane-based material, or a silicon-on-glass siloxane organic (SOG) material. Due to the excellent flatness of these materials, the subsequent surface tension ensures good flatness of the surface of the second light-collecting layer 32 facing away from the substrate 10. The step difference of the second light-collecting layer 32 can be less than 0.2 μm. Correspondingly, the surface of the second light-collecting layer 32 facing away from the substrate 10 is approximately parallel to the plane of the substrate 10. Furthermore, since the surface of the first light-collecting layer 31 facing away from the substrate 10 is curved, the thickness of the second light-collecting layer 32 at the corresponding position of the recessed structure 50 is greater than the thickness at the corresponding position of the protruding structure 40.

[0058] In this embodiment of the present disclosure, the distance between the light-shielding part 21 and the substrate 10 on the side facing away from the substrate 10 is greater than the distance between the light-filtering part 22 and the substrate 10 on the side facing away from the substrate 10.

[0059] Referring again to the exemplary embodiment shown in Figure 2, d1 represents the distance between the surface of the light-shielding part 21 facing away from the substrate 10 and the substrate 10, and d2 represents the distance between the surface of the light-filtering part 22 facing away from the substrate 10 and the substrate 10, wherein d1 > d2. In this way, a certain substrate step can be created by the light-shielding part 21. During the actual fabrication of the first light-collecting layer 31, the material for fabricating the first light-collecting layer 31 can flow with the substrate step, thereby forming the required protrusion structure 40 and recessed structure 50 on the surface of the first light-collecting layer 31 facing away from the substrate 10, thus obtaining a prism-like morphology, thereby providing a guarantee for the adjustment of the light angle. Of course, the specific values ​​of d1 and d2 can be set according to the actual application, and are not limited here.

[0060] In the embodiments of this disclosure, the light-shielding part 21 can be configured in several ways, but is not limited to these ways.

[0061] In one exemplary embodiment, the light-shielding portion 21 is a black matrix 60. That is, the light-shielding portion 21 can be fabricated using a black matrix 60. The exemplary embodiment shown in FIG2 can still be used to set the light-shielding portion 21. In the actual fabrication process, the light-filtering portion 22 can be fabricated first, and then the light-shielding portion 21 can be fabricated. This allows the step difference created by the light-shielding portion 21 to provide a guarantee for the subsequent fabrication of the recessed structure 50 and the raised structure 40 on the side surface of the first light-collecting layer 31 facing away from the substrate 10.

[0062] In one exemplary embodiment, the light-shielding part 21 is a composite structure made of two different colored pigments stacked together.

[0063] Referring to the exemplary embodiment shown in Figure 3, some light-shielding portions 21 are formed by sequentially stacking green resin material 221 and red resin material 222, while others are formed by sequentially stacking blue resin material 223 and green resin material 221. In this way, according to color subtraction, the composite structure formed by stacking two different colored resin materials can effectively absorb ambient light, thereby reducing the reflectivity of ambient light. It should be noted that in the actual fabrication process, the light-shielding portions 21 can be fabricated by stacking materials corresponding to the filter portion 22. For example, the pattern of the desired filter portion 22 can be formed simultaneously by stacking the corresponding materials. Of course, the specific stacking order of the different colored materials can be set according to actual needs during the fabrication process and is not limited here.

[0064] In this embodiment of the present disclosure, the distance between the side surface of the first light-collecting layer 31 facing away from the substrate 10 and the side surface of the light-shielding portion 21 facing away from the substrate 10 is greater than 1.0 μm.

[0065] In this embodiment of the present disclosure, the thickness of the second light-collecting layer 32 is greater than 1.0 μm and less than 2.0 μm.

[0066] In specific implementation, the first light-collecting layer 31 and the second light-collecting layer 32 can be configured such that the distance between the surface of the first light-collecting layer 31 facing away from the substrate 10 and the surface of the light-shielding portion 21 facing away from the substrate 10 is greater than 1.0 μm; the thickness of the second light-collecting layer 32 is greater than 1.0 μm and less than 2.0 μm. This ensures the refraction effect of the light path. Furthermore, after fabricating the second light-collecting layer 32 of the required thickness, the substrate step difference of the corresponding display substrate can be ensured to be less than 0.2 μm, guaranteeing the flatness of the second light-collecting layer 32 and providing a guarantee for the subsequent film layer fabrication.

[0067] In this embodiment of the present disclosure, the display substrate further includes a plurality of color conversion units 70 located on the side of the second light-collecting layer 32 away from the substrate 10, and each of the color conversion units 70 is disposed corresponding to the filter portion 22.

[0068] Referring again to the exemplary embodiments shown in Figures 2 and 3, the display substrate further includes a plurality of color conversion units 70 located on the side of the second light-collecting layer 32 facing away from the substrate 10. Exemplarily, the plurality of color conversion units 70 can be two, or three or more. Of course, the specific number of the plurality of color conversion units 70 can be set according to actual application needs and is not limited here. Furthermore, each color conversion unit 70 is correspondingly arranged with a filter unit 22. In this way, the color conversion unit 70 can convert the light emitted through the corresponding filter unit 22 into light of the desired color, thereby improving the color gamut and viewing angle of the display substrate, making the colors purer and more vibrant, and enhancing the color performance. Exemplarily, the color conversion unit 70 can convert absorbed blue light into red light, or convert absorbed blue light into green light. This ensures full-color display of the display substrate.

[0069] In this embodiment of the present disclosure, the display substrate further includes a blocking unit 80 surrounding the plurality of color conversion units 70. The thickness of the blocking unit 80 is greater than the thickness of the color conversion units 70, and the blocking unit 80 is disposed corresponding to the light-shielding portion 21.

[0070] Referring again to the exemplary embodiments shown in Figures 2 and 3, the display substrate further includes blocking units 80 surrounding the plurality of color conversion units 70. Exemplarily, the blocking units 80 can be a black matrix. Furthermore, the thickness of the blocking units 80 is greater than the thickness of the color conversion units 70, and the blocking units 80 are correspondingly disposed with the light-shielding portions 21. In this way, the blocking units 80 can, to a certain extent, prevent crosstalk between light rays emitted from the color conversion units 70. In actual fabrication, setting the thickness of the blocking units 80 to be greater than the thickness of the color conversion units 70, and setting the thickness increment to be less than 1 μm, can, to a certain extent, avoid bonding defects during subsequent bonding of the display substrate to the driving backplane, thereby improving the fabrication yield of the display device.

[0071] In this embodiment, the display substrate further includes a first encapsulation layer 90 located on the side of the second light-collecting layer 32 facing away from the substrate 10. This effectively prevents external moisture from corroding the light-collecting portion 30 and the color conversion unit 70, improving the performance of the display substrate. Exemplarily, the first encapsulation layer 90 can be prepared using atomic layer deposition (ALD) or chemical vapor deposition (CVD), and is not limited thereto. In one exemplary embodiment, the material of the first encapsulation layer 90 can be SiNx, and the corresponding refractive index can be greater than 1.7. In specific implementations, the material and refractive index of the first encapsulation layer 90 can be selected according to actual application needs, and are not limited thereto.

[0072] Furthermore, the display substrate also includes a second encapsulation layer 91 located on the side of the blocking unit 80 facing away from the substrate 10. This effectively prevents external moisture from corroding the color conversion unit 70, improving the performance of the display substrate. Exemplarily, the first encapsulation layer 90 can be fabricated using an ALD process, or the second encapsulation layer 91 can be fabricated using a CVD process; no limitation is made here. In one exemplary embodiment, the material of the second encapsulation layer 91 can be SiNx, and the corresponding refractive index can be greater than 1.7. In specific implementations, the material and refractive index of the second encapsulation layer 91 can be selected according to actual application needs; no limitation is made here.

[0073] The following section, in conjunction with the process flow diagram shown in Figure 4, provides a detailed explanation of the fabrication process of the display substrate shown in Figure 2.

[0074] First, a pattern of the filter portion 22 is formed on the substrate 10 using a photolithography process. For example, patterns of a red filter portion, a green filter portion, and a blue filter portion are sequentially formed on the substrate 10. Then, a pattern of a light-shielding portion 21 is formed on the side of the filter portion 22 facing away from the substrate 10 using a photolithography process. For example, the light-shielding portion 21 can be a BM (bulb diaphragm). It should be noted that by creating the light-shielding portion 21 subsequently, when the distance between the surface of the light-shielding portion 21 facing away from the substrate 10 and the substrate 10 is greater than the distance between the surface of the filter portion 22 facing away from the substrate 10 and the substrate 10, it can be ensured that the surface of the first light-collecting layer 31 facing away from the substrate 10 has the required specific morphological structure of the protrusion structure 40 and the recess structure 50.

[0075] Then, a first light-collecting layer 31 is coated on the side of the light-shielding portion 21 facing away from the substrate 10. For example, the refractive index of the first light-collecting layer 31 is 1.7. In actual fabrication, a conventional transparent organic material can be used to prepare the first light-collecting layer 31. For example, an acrylic resin material can be used. In this case, when such a material is cured at high temperature, it is prone to melting and flow. Accordingly, the relevant film material can flow with the substrate step difference, thereby forming the desired protruding structure 40 and recessed structure 50, becoming a lens-like morphology.

[0076] Then, a second light-collecting layer 32 is coated on the side of the first light-collecting layer 31 facing away from the substrate 10. For example, the refractive index of the second light-collecting layer 32 is 1.4. In actual fabrication, a highly flattenable transparent organic material, such as SOG-type materials, can be used. In this way, due to the excellent flatness of the material, the surface tension during post-baking can ensure that the flatness of the corresponding second light-collecting layer 32 is less than 0.2 μm, thereby improving the fabrication efficiency of subsequent film layers.

[0077] Then, using an ALD or CVD process, a first encapsulation layer 90 is fabricated on the side of the second light-collecting layer 32 facing away from the substrate 10. For example, the material of the first encapsulation layer 90 is SiNx, with a refractive index greater than 1.7. Then, using a photolithography process, a pattern of color conversion units 70 is fabricated on the side of the first encapsulation layer 90 facing away from the substrate 10. For example, patterns of a scattering particle layer, a red light color conversion unit, and a green light color conversion unit are fabricated sequentially. Then, a blocking unit 80 is fabricated. For example, the thickness of the blocking unit 80 is greater than the thickness of the color conversion unit 70, and the thickness difference is less than 1 μm. Then, a second encapsulation layer 91 is fabricated. For example, using an ALD or CVD process, the second encapsulation layer 91 is fabricated on the side of the color conversion unit 70 facing away from the substrate 10.

[0078] In this embodiment of the disclosure, based on the same disclosed concept, the specific fabrication process of the display substrate shown in FIG3 can be referred to the specific implementation process in FIG4. The difference is that in the display substrate shown in FIG3, the pigments corresponding to the light filter 22 need to overlap to form the pattern of the light-shielding part 21 required to achieve the substrate step difference of the required thickness, so as to form the required lens-like morphology including the protrusion structure 40 and the recess structure 50 on the side of the first light-collecting layer 31 facing away from the substrate 10.

[0079] It should be noted that, in addition to the film layer structure mentioned above, the display substrate provided in this embodiment can also be provided with other film layer structures according to actual application needs. The specific settings can be implemented with reference to related technologies, which will not be described in detail here.

[0080] Based on the same disclosed concept, as shown in FIG5, this disclosure also provides a display device, which includes:

[0081] The display substrate 100 as described in any of the above, and the drive backplate 200 electrically connected to the display substrate 100.

[0082] In practical implementation, the display substrate 100 and the driving backplane 200 can be bonded together using bonding adhesive 300, which is less than 0.2 μm thick. This ensures both light efficiency and avoids color mixing issues. Furthermore, the driving backplane 200 has a pixel driving circuit for driving the light-emitting devices 400 in the display substrate 100 to emit light. A typical pixel driving circuit includes multiple transistors such as driving transistors and switching transistors, as well as a storage capacitor. Its specific structure and working principle can be found in related technologies and will not be detailed here.

[0083] In this embodiment, the display device further includes a plurality of light-emitting devices 400 located between the display substrate 100 and the driving backplate 200. The plurality of light-emitting devices 400 are electrically connected to the driving backplate 200, and each of the light-emitting devices 400 is correspondingly disposed with a recessed structure 50 in the curved surface. Along the direction from the second light-collecting layer 32 to the first light-collecting layer 31 and perpendicular to the plane of the substrate 10, the curved surface includes a plurality of protruding structures 40 and a plurality of recessed structures 50, with the protruding structures 40 and the recessed structures 50 arranged alternately. The plurality of light-emitting devices 400 can be two, three, or more, and is not limited herein.

[0084] In specific implementations, the multiple light-emitting devices 400 can be multiple, or three or more, without limitation. For example, the multiple light-emitting devices 400 include red, green, and blue light-emitting devices, thereby ensuring color display of the display device. Furthermore, the light-emitting devices 400 can be at least one of Organic Light Emitting Diode (OLED), Quantum Dot Light Emitting Diodes (QLED), Micro LED, and Mini LED.

[0085] In one exemplary embodiment, FIG6 shows a schematic diagram of one structure of the driving backplane 200. The specific film structure of the driving backplane 200 can be found in the description below and will not be detailed here. Based on the display substrate 100 shown in FIG3 and the driving backplane 200 shown in FIG6, a schematic diagram of one structure of the display device is shown in FIG7.

[0086] Based on the display substrate 100 shown in FIG2 and the driving backplate 200 shown in FIG6, one structural schematic diagram of the display device is shown in FIG8.

[0087] In this embodiment of the disclosure, each of the light-emitting devices 400 includes a first electrode 401, an epitaxial layer 402, and a second electrode 403 disposed sequentially away from the substrate 10, and the light-emitting devices 400 of the same color are connected in series through corresponding electrodes.

[0088] Referring again to the exemplary embodiments shown in Figures 7 and 8, each light-emitting device 400 can be at least one of QLED, Micro LED, and Mini LED. Accordingly, each light-emitting device 400 includes a first electrode 401, an epitaxial layer 402, and a second electrode 403 disposed sequentially away from the substrate 10. In one exemplary embodiment, the first electrode 401 is an N-type electrode, and correspondingly, the second electrode 403 is a P-type electrode. In another exemplary embodiment, the first electrode 401 is a P-type electrode, and correspondingly, the second electrode 403 is an N-type electrode. Of course, the first electrode 401 and the second electrode 403 can be configured according to actual application needs, and are not limited here. Furthermore, light-emitting devices 400 of the same color are connected in series through corresponding electrodes. For example, all red light-emitting devices are connected in series through corresponding electrodes, all green light-emitting devices are connected in series through corresponding electrodes, and all blue light-emitting devices are connected in series through corresponding electrodes, thereby reducing the power consumption of the display device.

[0089] In this embodiment of the present disclosure, the display device further includes a reflective structure 500 disposed around the light-emitting device 400, the reflective structure 500 including a main body portion 501 and a metal reflective layer 502 disposed on the side wall of the main body portion 501 near the light-emitting device 400.

[0090] In one exemplary embodiment, FIG9 shows a schematic diagram of one structure of the display device. Specifically, the display device further includes a reflective structure 500 disposed around the light-emitting device 400, and the reflective structure 500 is correspondingly disposed with respect to the blocking unit 80. Furthermore, the reflective structure 500 includes a main body 501 and a metal reflective layer 502 disposed on the sidewall of the main body 501 near the light-emitting device 400. Exemplarily, the material of the main body 501 can be a conventional organic material, such as polyimide. In addition, the metal reflective layer 502 can reflect lateral light from the light-emitting device 400, thereby improving light utilization to a certain extent.

[0091] In this embodiment of the disclosure, each of the light-emitting devices 400 is electrically connected to the driving backplane 200 via a flip-chip connection.

[0092] In one exemplary embodiment, FIG10 shows a schematic diagram of one structure of the display device. Each light-emitting device 400 is electrically connected to the driving backplate 200 via a flip-chip connection.

[0093] In this embodiment of the present disclosure, the display device further includes an anode layer 600, a light-emitting functional layer 700, and a cathode layer 800 disposed sequentially away from the substrate 10; the anode layer 600 corresponding to each of the light-emitting devices 400 is disposed intermittently, and the light-emitting functional layer 700 and the cathode layer 800 are disposed as a whole layer.

[0094] In one exemplary embodiment, FIG11 shows a schematic diagram of one structure of the display device. Specifically, the display device further includes an anode layer 600, a light-emitting functional layer 700, and a cathode layer 800 disposed sequentially away from the substrate 10. Exemplarily, the light-emitting functional layer 700 may include a hole injection layer, a hole transport layer, a light-emitting material layer, an electron transport layer, and an electron injection layer sequentially stacked along a direction away from the driving backplate 200. Furthermore, the anode layers 600 corresponding to each light-emitting device 400 are intermittently disposed, while the light-emitting functional layer 700 may be a single, continuous layer, and the cathode layer 800 may also be a single, continuous layer. The pattern of the anode layer 600 corresponds to the desired light-emitting device 400. It should be noted that in this exemplary embodiment, the display device further includes a partition structure 900 disposed around the anode layer 600, which corresponds to the blocking unit 80. For example, the partition structure 900 includes a pixel defining layer 901 and a spacer 902 disposed sequentially away from the drive back plate 200. For example, the spacer 902 can be a post spacer (PS). The specific configuration can be implemented with reference to related technologies, which will not be described in detail here.

[0095] It should be noted that, in the exemplary embodiments shown in Figures 7 to 9, the display device further includes a substrate 910 located on the side of the driving backplate 200 opposite to the substrate 10, and a passivation layer 911, a first planarization layer 912, a first metal bonding layer 913, a third encapsulation layer 914, a second planarization layer 915, a series electrode layer 916, and a third planarization layer 917 sequentially disposed on the side of the driving backplate 200 opposite to the substrate 910. The bonding adhesive 300 is located between the second encapsulation layer 91 and the third planarization layer 917. Of course, the specific arrangement of the relevant film layers can be implemented with reference to related technologies, and will not be detailed here.

[0096] In the exemplary embodiment shown in FIG10, the display device further includes a second metal bonding layer 918, a passivation layer 911, and a bonding electrode layer 919 sequentially disposed on the side of the driving backplate 200 near the substrate 10, and an epitaxial layer 402, a first planarization layer 912, a third encapsulation layer 914, and a second planarization layer 915 sequentially disposed on the side of the bonding electrode layer 919 away from the driving backplate 200. The bonding adhesive 300 is located between the second encapsulation layer 91 and the second planarization layer 915. Of course, the display device provided in this embodiment may include other film layer structures besides the aforementioned film layers, depending on the actual application requirements. Specific arrangements of the relevant film layers can be implemented with reference to related technologies, and will not be detailed here.

[0097] Since the principle by which this display device solves the problem is similar to that of the aforementioned display substrate 100, the implementation of this display device can refer to the implementation of the aforementioned display substrate 100, and the repeated parts will not be described again.

[0098] In specific implementations, the display device provided in the embodiments of this disclosure can be any product or component with display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator. Other essential components of this display device are those that should be understood by those skilled in the art, and will not be described in detail here, nor should they be construed as limiting this disclosure.

[0099] 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.

[0100] 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; The color filter layer is located on the substrate; The light-collecting part is located on the side of the color filter layer away from the substrate and completely covers the color filter layer; the light-collecting part includes a first light-collecting layer and a second light-collecting layer disposed sequentially away from the substrate. Compared with the plane parallel to the substrate, the surface of the first light-collecting layer away from the substrate is curved, and the refractive index of the first light-collecting layer is greater than the refractive index of the second light-collecting layer.

2. The display substrate as claimed in claim 1, wherein, Along the direction from the second light-collecting layer to the first light-collecting layer and perpendicular to the plane of the substrate, the curved surface includes multiple protrusions and multiple recesses, with each of the protrusions and recesses arranged alternately.

3. The display substrate as described in claim 2, wherein, The color filter layer includes a light-shielding portion and a plurality of light-filtering portions surrounded by the light-shielding portion. The recessed structure is disposed corresponding to the light-filtering portion, and the raised structure is disposed corresponding to the light-shielding portion.

4. The display substrate according to any one of claims 1-3, wherein, The surface of the second light-collecting layer facing away from the substrate is parallel to the plane of the substrate, and the thickness of the second light-collecting layer at the corresponding position of the recessed structure is greater than the thickness at the corresponding position of the protruding structure.

5. The display substrate as claimed in claim 3, wherein, The distance between the light-shielding part and the substrate on the side facing away from the substrate is greater than the distance between the light-filtering part and the substrate on the side facing away from the substrate.

6. The display substrate as claimed in claim 5, wherein, The light-shielding part is a black matrix.

7. The display substrate as claimed in claim 5, wherein, The light-shielding part is a composite structure made up of two different colored pigments stacked together.

8. The display substrate according to any one of claims 5-7, wherein, The distance between the surface of the first light-collecting layer facing away from the substrate and the surface of the light-shielding part facing away from the substrate is greater than 1.0 μm.

9. The display substrate as claimed in claim 8, wherein, The thickness of the second light-collecting layer is greater than 1.0 μm and less than 2.0 μm.

10. The display substrate according to any one of claims 5-7, 9, wherein, It also includes a plurality of color conversion units located on the side of the second light-collecting layer away from the substrate, and each of the color conversion units is disposed corresponding to the filter section.

11. The display substrate as claimed in claim 10, wherein, It also includes a blocking unit surrounding the plurality of color conversion units, the thickness of the blocking unit being greater than the thickness of the color conversion units, and the blocking unit being disposed corresponding to the light-shielding part.

12. A display device, wherein, include: The display substrate as described in any one of claims 1-11, and the driving backplate electrically connected to the display substrate.

13. The display device as claimed in claim 12, wherein, It also includes a plurality of light-emitting devices located between the display substrate and the driving backplate, the plurality of light-emitting devices being electrically connected to the driving backplate, and each of the light-emitting devices being disposed corresponding to a recessed structure in the curved surface; along the direction from the second light-collecting layer to the first light-collecting layer and perpendicular to the plane where the substrate is located, the curved surface includes a plurality of protruding structures and a plurality of recessed structures, the protruding structures and the recessed structures being arranged alternately.

14. The display device as claimed in claim 13, wherein, Each of the light-emitting devices includes a first electrode, an epitaxial layer, and a second electrode disposed sequentially away from the substrate, and light-emitting devices of the same color are connected in series through corresponding electrodes.

15. The display device as claimed in claim 14, wherein, It also includes a reflective structure disposed around the light-emitting device, the reflective structure comprising a main body and a metal reflective layer disposed on the sidewall of the main body near the light-emitting device.

16. The display device as claimed in claim 13, wherein, Each of the light-emitting devices is electrically connected to the driving backplane via a flip-chip connection.

17. The display device as claimed in claim 13, wherein, It also includes an anode layer, a light-emitting functional layer, and a cathode layer disposed sequentially away from the substrate; the anode layer corresponding to each of the light-emitting devices is disposed intermittently, and the light-emitting functional layer and the cathode layer are disposed as a whole layer.

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