Display substrate, display panel and display device

Abstract

The present disclosure provides a display substrate, a display panel and a display device, and belongs to the technical field of display, and solves the problem of low light extraction efficiency of the existing display substrate. The display substrate comprises a first substrate having alternating light shielding areas and light transmitting areas; a color filter layer disposed on the first substrate, the thickness of the color filter layer in the light shielding area is greater than the thickness of the color filter layer in the light transmitting area, and a plurality of groove portions of the color filter layer are defined; and a protective layer disposed on the side of the color filter layer away from the first substrate and in contact with the color filter layer; wherein the refractive index of the protective layer is greater than the refractive index of at least the surface of the sidewall of the groove portion in contact with the protective layer.

Description

Technical Field

[0001] This disclosure belongs to the field of display technology, specifically relating to a display substrate, a display panel, and a display device. Background Technology

[0002] Organic light-emitting diode (OLED) display devices mainly include bottom-emitting (emitting light downwards relative to the substrate) and top-emitting (emitting light upwards relative to the substrate) types. Compared to bottom-emitting OLEDs, top-emitting OLEDs do not emit light through the substrate; the light is emitted from above the device. The pixel circuitry design on the substrate does not affect the light-emitting area of ​​the device, avoiding competition between the TFT and metal circuitry areas and the light-emitting area. This effectively increases the panel aperture ratio, enabling the fabrication of high-brightness, high-resolution OLED display panels. Simultaneously, top-emitting OLEDs operate at lower voltages for the same brightness, resulting in longer device lifespan and lower power consumption.

[0003] In top-emitting OLED display devices, a color filter (CF filter) is required to achieve full-color output for vapor-deposited white OLED devices (WOLED). Similarly, an CF filter is added for inkjet-printed SBS OLED devices (IJP) to improve the purity of emitted colors. The CF filter consists of R, G, and B color photoresists and a black matrix (BM). OLED light emission passes through the R, G, and B color photoresists to achieve high-purity colors. However, a portion of the light beam illuminates the black matrix, where most of the light is absorbed and a small portion is reflected. This reduces optical light leakage from the display substrate, but also lowers the light extraction efficiency of the display substrate. Summary of the Invention

[0004] This disclosure aims to at least solve one of the technical problems existing in the prior art, and to provide a display substrate, a display panel, and a display device.

[0005] In a first aspect, embodiments of this disclosure provide a display substrate, comprising:

[0006] The first substrate has alternating light-blocking and light-transmitting areas;

[0007] A color filter layer is disposed on a first substrate, wherein the thickness of the color filter layer in the light-shielding area is greater than the thickness in the light-transmitting area, and defines a plurality of grooves in the color filter layer.

[0008] A protective layer is disposed on the side of the color filter layer away from the first substrate and in contact with the color filter layer; wherein the refractive index of the protective layer is greater than the refractive index of at least the surface of the groove sidewall in contact with the protective layer.

[0009] Optionally, the color filter layer includes a plurality of color filters and a light-shielding component disposed between adjacent color filters; the color filters are disposed in the light-transmitting area, and the light-shielding component is disposed in the light-shielding area.

[0010] Optionally, the color filter layer includes a first color filter, a second color filter, and a third color filter, and the light-shielding component includes a first substructure, a second substructure, and a third substructure stacked together, wherein the first substructure, the second substructure, and the third substructure are made of the same material as the first color filter, the second color filter, and the third color filter, respectively.

[0011] Optionally, the third substructure covers the sidewall of the second substructure, and the second substructure and the third substructure located in the light-shielding area constitute at least a portion of the structure of the groove sidewall; the refractive index of the third substructure is less than the refractive index of the protective layer.

[0012] Optionally, the refractive indices of the first substructure, the second substructure, and the third substructure increase sequentially.

[0013] Optionally, the thickness of the first substructure is the same as the thickness of the first filter; the thickness of the second substructure is less than the thickness of the second filter; the thickness of the third substructure is less than the thickness of the third filter; and the thickness of the first substructure is less than the thickness of the second substructure; the thickness of the third substructure is less than the thickness of the second substructure.

[0014] Optionally, the color filter layer includes a plurality of color filters and a black matrix disposed between adjacent color filters; the color filter includes a main color filter portion and a secondary color filter portion surrounding the main color filter portion and at least covering the sidewalls of the black matrix; the black matrix and the secondary color filters are located in the light-shielding area; the main color filter is located in the light-transmitting area; wherein the thickness of the main color filter portion is less than the thickness of the black matrix.

[0015] Optionally, the sub-color filter is disposed on a surface of the black matrix that is opposite to the first substrate; the thickness of the sub-color filter is less than the thickness of the main color filter.

[0016] Secondly, embodiments of this disclosure provide a display panel, the display panel including the display substrate described above.

[0017] Optionally, the display panel further includes a plurality of light-emitting devices and a second substrate, wherein the first substrate and the second substrate are disposed opposite to each other, the plurality of light-emitting devices are disposed on the second substrate, and each light-emitting device is disposed corresponding to the light-transmitting area.

[0018] Optionally, the display panel further includes a sealing structure, wherein the first substrate and the second substrate are fixed together by the sealing structure shown.

[0019] Optionally, a filler material is provided between the protective layer and the light-emitting device, wherein the refractive index of the filler material is greater than the refractive index of the material of the protective layer.

[0020] Thirdly, embodiments of this disclosure provide a display device including the display panel described above. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of an exemplary display substrate.

[0022] Figure 2 This is a schematic diagram of the structure of a display substrate provided in an embodiment of the present disclosure;

[0023] Figure 3 for Figure 2 The image shown is a magnified view of a portion of region H in the display substrate.

[0024] Figure 4 For having Figure 2 A schematic diagram of the display panel structure of the display substrate shown;

[0025] Figure 5 This is a schematic diagram of another display substrate provided in an embodiment of the present disclosure;

[0026] Figure 6 For having Figure 5 A schematic diagram of the display panel structure of the display substrate shown;

[0027] Figure 7 This is a schematic diagram of the structure of another display substrate provided in an embodiment of the present disclosure. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] 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. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms 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. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0030] Figure 1 This is a schematic diagram of an exemplary display substrate, such as... Figure 1 As shown, the display substrate includes a substrate 1 and a color filter layer 2 formed on the substrate 1. The color filter layer 2 includes a plurality of color filters 21 spaced apart and a black matrix 22 disposed between the color filters 21. The color filters 21 can be color filters of different colors, such as red, blue, and green filters, and may also include a yellow filter. In this embodiment, the display substrate includes red, blue, and green filters as an example for illustration.

[0031] like Figure 1 As shown, the light emitted by the OLED light-emitting device E passes through red, green, and blue color filters to achieve high-purity color. However, a portion of the light beam illuminates the black matrix 22, and most of the light is absorbed by the black matrix 22. Therefore, by setting the black matrix 22, optical light leakage of the display substrate can be reduced, but the light extraction efficiency of the display substrate will be decreased.

[0032] It should be noted that there is no specific limitation on the type of light-emitting device E. The light-emitting device E can be OLED, Micro LED, QLED or mini LED. This embodiment is illustrated by taking OLED light-emitting device E as an example.

[0033] To address at least one of the aforementioned technical problems, this disclosure provides a display substrate, a display panel, and a display device. The display substrate, display panel, and display device provided in this disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] This disclosure provides a display substrate, which includes a first substrate, a color filter layer, and a protective layer.

[0035] Specifically, the first substrate has alternating light-shielding and light-transmitting areas. A color filter layer is disposed on the first substrate, with the thickness of the color filter layer in the light-shielding area being greater than the thickness in the light-transmitting area, defining multiple grooves in the color filter layer. A protective layer is disposed on the side of the color filter layer facing away from the first substrate and is in contact with the color filter layer. The refractive index of the protective layer is greater than the refractive index of the surface of the groove sidewall in contact with the protective layer.

[0036] In this embodiment, by providing a protective layer on the side of the color filter layer away from the first substrate, and the refractive index of the protective layer material is greater than the refractive index of the surface of the groove sidewall in contact with the protective layer, the light emitted by the light-emitting device illuminates the groove sidewall and undergoes total internal reflection at the interface where the groove sidewall contacts the protective layer, so that the light is emitted from the light-transmitting area, thereby improving the light extraction efficiency of the display substrate.

[0037] Figure 2 This is a schematic diagram of the structure of a display substrate provided in an embodiment of the present disclosure; Figure 3 for Figure 2 The image shown is a magnified view of a portion of region H in the display substrate. Figures 2-3 As shown, the display substrate includes a first substrate 11, a colored green light layer 12, and a protective layer 13.

[0038] Specifically, the first substrate 11 has alternating light-shielding areas Q1 and light-transmitting areas Q2. A color filter layer 12 is disposed on the first substrate 11, and a protective layer 13 is disposed on the side of the color filter layer 12 facing away from the first substrate 11 and in contact with the color filter layer 12. The color filter layer 12 includes a plurality of color filters 121 and a black matrix 122 disposed between adjacent color filters 121. The color filters 121 include a main color filter portion 1211 and a sub-color filter portion 1212 surrounding the main color filter portion 1211 and covering the sidewalls of the black matrix 122. The black matrix 122 and the sub-color filters 1212 are both located in the light-shielding area Q1, and the main color filter 1211 is located in the light-transmitting area Q2. The thickness of the main color filter 1211 is less than the thickness of the black matrix 122. The refractive index of the protective layer 13 is greater than the refractive index of the sub-color filter portion 1212.

[0039] It should be noted that in this embodiment, the sub-color filter 1212 covers the sidewalls and part of the top wall of the black matrix 122. Of course, the sub-color filter 1212 may also only cover the sidewalls of the black matrix 122, which is not specifically limited here.

[0040] The main color filter 1211 and the sub-color filter 1212 in the color filter 121 can be made of the same or different materials; they can be an integral structure or a separate structure, and no specific limitation is made here. This embodiment is described with the main color filter 1211 and the sub-color filter 1212 made of the same material and being an integral structure, that is, in this embodiment, the refractive index of the protective layer 13 is greater than the refractive index of the color filter 121.

[0041] The color of the color filter 121 can be selected according to the situation, and no specific limitation is made here. This embodiment is illustrated by taking a color filter layer 121 including a red filter R, a blue filter B, and a green filter G as an example. The refractive index range of the color filter 121 is 1.4 to 1.5.

[0042] The material of the color filter 121 is a conventional material and is not specifically limited here. The material of the protective layer 13 includes metal oxides or non-metal oxides, such as SiNx, SiONx, HMDSO, SiOx, Al2O3, and water-blocking and water-absorbing materials, but not limited to these. The thickness of the protective layer 13 can be selected as needed and is not specifically limited here. Preferably, the thickness of the protective layer 13 is 1-2 μm. Preferably, the difference in refractive index between the protective layer 13 and the color filter 12 is greater than 0.2.

[0043] In this embodiment, by forming a protective layer 13 on the side of the main color filter 1211 and the sub-color filter 1212 away from the first substrate 11, and by making the refractive index of the protective layer 13 greater than that of the sub-color filter 1212, light emitted by the light-emitting device can be directed to the sub-color filter 1212 and undergo total internal reflection at the interface where the sub-color filter 1212 contacts the protective layer 13, so that light is emitted from the light-transmitting area Q2, thereby improving the light extraction efficiency of the display substrate.

[0044] Figure 4 For having Figure 2 The schematic diagram of the display panel structure of the display substrate shown is as follows: Figure 4 As shown, the display panel includes Figure 2 The diagram shows a display substrate, multiple OLED light-emitting devices E, and a second substrate 14. The display substrate includes a first substrate 11, a color filter layer 12, and a protective layer 13. In the display panel, the first substrate 11 and the second substrate 14 are arranged in a cell-to-cell configuration. Multiple OLED light-emitting devices E are disposed on the second substrate 14, and each OLED light-emitting device E corresponds to a light-transmitting area Q2. Figure 4As shown, the display panel also includes a sealing structure 15, through which the first substrate 11 and the second substrate 14 are fixed. The second substrate 14 also has a pixel defining layer 141 with multiple openings, and the OLED light-emitting device E is disposed within the openings of the pixel defining layer 141. A filler material 16 is disposed between the protective layer 13 and the OLED light-emitting device E, wherein the refractive index of the filler material 16 is greater than that of the protective layer 13. The filler material 16 can be epoxy resin, acrylic, Si-based materials, etc. The refractive index of the filler material 16 is greater than 1.4.

[0045] In this embodiment, since a protective layer 13 is formed on the side of the main color filter 1211 and the sub-color filter 1212 away from the first substrate 11, and the refractive index of the protective layer 13 is greater than that of the sub-color filter 1212, light emitted by the OLED light-emitting device E can illuminate the sub-color filter 1212 and undergo total internal reflection at the interface where the sub-color filter 1212 contacts the protective layer 13, allowing the light to exit from the light-transmitting area Q2, thereby improving the light extraction efficiency of the display panel. Furthermore, since a filler material 16 is disposed between the protective layer 13 and the OLED light-emitting device E, and the refractive index of the filler material 16 is greater than that of the protective layer 13, light emitted by the OLED light-emitting device E undergoes total internal reflection at the surface where the protective layer 13 contacts the filler material 16, allowing the light to exit from the light-transmitting area Q2, thereby further improving the light extraction efficiency of the display panel.

[0046] In some embodiments, such as Figure 4 As shown, an encapsulation layer 142 is formed on the side of the pixel limiting layer 141 opposite to the second substrate 14.

[0047] In this embodiment, the encapsulation layer 142 and encapsulation layer 32 can be encapsulation films or encapsulation substrates. When the encapsulation layer 142 is an encapsulation film, the number of encapsulation film layers included in the encapsulation layer 142 is not limited; the encapsulation layer 142 can include one encapsulation film or two or more encapsulation films stacked together. In some embodiments, the encapsulation layer 142 includes three encapsulation films stacked sequentially. When the encapsulation layer 142 includes three encapsulation films stacked sequentially, optionally, the material of the encapsulation film in the middle layer is an organic material, and the materials of the encapsulation films on both sides are inorganic materials. Here, the organic material is not limited; for example, it can be PMMA (Polymethylmethacrylate). The inorganic material is not limited; for example, the inorganic material can be one or more of SiNx (silicon nitride), SiOx (silicon oxide), or SiOxNy (silicon oxynitride).

[0048] In this embodiment, by forming an encapsulation layer 142 on the side of the pixel limiting layer 141 opposite to the second substrate 14, the OLED light-emitting device E can be prevented from being corroded by moisture.

[0049] Figure 5 This is a schematic diagram of another display substrate structure provided in an embodiment of the present disclosure, as shown below. Figure 5 As shown, the display substrate includes a first substrate 11, a color filter layer 12, and a protective layer 13.

[0050] Specifically, the first substrate 11 has alternating light-shielding areas Q1 and light-transmitting areas Q2. A color filter layer 12 is disposed on the first substrate 11, and a protective layer 13 is disposed on the side of the color filter layer 12 facing away from the first substrate 11 and in contact with the color filter layer 12. The color filter layer 12 includes a plurality of color filters and a light-shielding component 122 disposed between adjacent color filters. The color filters are disposed in the light-transmitting areas Q2, and the color filters include a first color filter, a second color filter, and a third color filter. In this embodiment, the first color filter is a red filter R, the second color filter is a blue filter B, and the third color filter is a green filter G, as an example. Of course, the color filters may also include filters of other colors, which are not specifically limited here. A light-shielding component 122 is disposed in the light-shielding area Q1. The light-shielding component 122 includes a first substructure 122a, a second substructure 122b, and a third substructure 122c stacked together. The thickness of the first substructure 122a is the same as the thickness of the red filter R, the thickness of the second substructure 122b is less than the thickness of the blue filter B, and the thickness of the third substructure 122c is less than the thickness of the green filter G. Furthermore, the thickness of the first substructure 122a is less than the thickness of the second substructure 122b, and the thickness of the third substructure 122c is less than the thickness of the second substructure 122b. The first substructure 122a is made of the same material as the red filter R, the second substructure 122b is made of the same material as the blue filter B, and the third substructure 122c is made of the same material as the green filter G. Figure 5 As shown, the third substructure 122c covers the sidewall of the second substructure 122b, and the second substructure 122b and the third substructure 122c located in the light-shielding area Q1 serve as the sidewalls of the groove C. The refractive index of the third substructure 122c is less than the refractive index of the protective layer 13. Of course, it is also possible that a portion of the second substructure 122b, the third substructure 122c, and the first substructure 122a serve as the sidewalls of the groove C.

[0051] The thickness of the first substructure 122a can be selected according to the situation, and no specific limitation is made here. Preferably, the thickness of the first substructure 122a is 1 to 4 μm.

[0052] The material of the green filter G is a conventional material and is not specifically limited here. The refractive index of the green filter G is in the range of 1.4 to 1.5, that is, the refractive index of the third substructure 122c is in the range of 1.4 to 1.5. Preferably, the refractive index of the green filter G is 1.45, that is, the refractive index of the third substructure 122c is 1.45.

[0053] The material of the protective layer 13 includes metal oxides or non-metal oxides, such as SiNx, SiONx, HMDSO, SiOx, Al2O3, and water-blocking and water-absorbing materials. The thickness of the protective layer 13 can be selected according to the situation and is not specifically limited here. Preferably, the thickness of the protective layer 13 is 1-2 μm. Preferably, the difference in refractive index between the protective layer 13 and the green filter G (third substructure 122c) is >0.2.

[0054] In this embodiment, the light-shielding component 122 includes a first substructure 122a, a second substructure 122b, and a third substructure 122c stacked together. By providing a protective layer 13 on the side of the color filter layer 12 away from the first substrate 11, and the refractive index of the protective layer 13 being greater than that of the third substructure 122c, light emitted by the light-emitting device can be directed to the third substructure 122c and undergo total internal reflection at the interface where the third substructure 122c contacts the protective layer 13, so that light is emitted from the light-transmitting area Q2, thereby improving the light extraction efficiency of the display substrate and thus improving the display effect.

[0055] It should be noted that the materials of the first substructure 122a and the red filter R can be the same or different; the materials of the second substructure 122b and the blue filter B can be the same or different; and the materials of the third substructure 122c and the green filter G can be the same or different, as long as the refractive index of the third substructure 122c is less than that of the protective layer. In this embodiment, by using the same material for the first substructure 122a and the red filter R, the same material for the second substructure 122b and the blue filter B, and the same material for the third substructure 122c and the green filter G, the structure of the light-shielding area and the light-transmitting area can be formed simultaneously in a single patterning process. Therefore, no additional mask or process is required, simplifying the process flow, saving process steps, and reducing manufacturing costs.

[0056] In addition, the materials of each substructure in this embodiment can be selected according to the situation, as long as the refractive index of the substructure adjacent to the protective layer 13 is less than the refractive index of the protective layer 13.

[0057] In some embodiments, such as Figure 5As shown, the refractive indices of the first substructure 122a, the second substructure 122b, and the third substructure 122c increase sequentially. That is, the refractive index of the third substructure 122c is greater than that of the second substructure 122b, the refractive index of the second substructure 122b is greater than that of the first substructure 122a, and the refractive index of the third substructure 122c is less than that of the protective layer 13.

[0058] In this embodiment, since the refractive index of the third substructure 122c is greater than that of the second substructure 122b, and the refractive index of the second substructure 122b is greater than that of the first substructure 122a, the light emitted by the light-emitting device illuminates the second substructure 122b and undergoes total internal reflection at the interface where the second substructure 122b and the third substructure 122c are in contact, so that the light is emitted from the light-transmitting area Q2, thereby further improving the light extraction efficiency of the display substrate.

[0059] Figure 6 For having Figure 5 The schematic diagram of the display panel structure of the display substrate shown is as follows: Figure 6 As shown, the display panel includes Figure 5 The display panel includes a display substrate, multiple OLED light-emitting devices E, and a second substrate 14. The display substrate includes a first substrate 11, a color filter layer 12, and a protective layer 13. In the display panel, the first substrate 11 and the second substrate 14 are arranged in a cell, and multiple OLED light-emitting devices E are disposed on the second substrate 14. Each OLED light-emitting device E is disposed corresponding to a light-transmitting area Q2.

[0060] like Figure 6 As shown, the display panel also includes a sealing structure 15, through which the first substrate 11 and the second substrate 14 are fixed together. The second substrate 14 is further provided with a pixel defining layer 141, which has multiple openings, and the OLED light-emitting device E is disposed within the openings of the pixel defining layer 141. A filler material 16 is disposed between the protective layer 13 and the OLED light-emitting device E, wherein the refractive index of the filler material 16 is greater than the refractive index of the protective layer 13.

[0061] The filler material 16 can be epoxy resin, acrylic resin, Si-based material, etc. The refractive index of the filler material 16 is greater than 1.4.

[0062] In this embodiment, since the refractive index of the third substructure 122c is greater than that of the second substructure 122b, and the refractive index of the second substructure 122b is greater than that of the first substructure 122a, the light emitted by the light-emitting device illuminates the second substructure 122b and undergoes total internal reflection at the interface where the second substructure 122b and the third substructure 122c contact, causing the light to exit from the light-transmitting area Q2, thereby improving the light extraction efficiency of the display panel. Furthermore, since a filling material 16 is disposed between the protective layer 13 and the OLED light-emitting device E, and the refractive index of the filling material 16 is greater than that of the protective layer 13, the light emitted by the OLED light-emitting device E undergoes total internal reflection at the surface where the protective layer 13 and the filling material 16 contact, thereby improving the light extraction efficiency of the display panel.

[0063] In some embodiments, such as Figure 6 As shown, an encapsulation layer 142 is formed on the side of the pixel limiting layer 141 opposite to the second substrate 14.

[0064] In this embodiment, the encapsulation layer 142 and encapsulation layer 32 can be encapsulation films or encapsulation substrates. When the encapsulation layer 142 is an encapsulation film, the number of encapsulation film layers included in the encapsulation layer 142 is not limited; the encapsulation layer 142 can include one encapsulation film or two or more encapsulation films stacked together. In some embodiments, the encapsulation layer 142 includes three encapsulation films stacked sequentially. When the encapsulation layer 142 includes three encapsulation films stacked sequentially, optionally, the material of the encapsulation film in the middle layer is an organic material, and the materials of the encapsulation films on both sides are inorganic materials. Here, the organic material is not limited; for example, it can be PMMA (Polymethylmethacrylate). The inorganic material is not limited; for example, the inorganic material can be one or more of SiNx (silicon nitride), SiOx (silicon oxide), or SiOxNy (silicon oxynitride).

[0065] By forming an encapsulation layer 142 on the side of the pixel limiting layer 141 opposite to the second substrate 14, the OLED light-emitting device E can be prevented from being corroded by moisture.

[0066] Figure 7 This is a schematic diagram of the structure of another display substrate provided in an embodiment of the present disclosure, as shown below. Figure 7 As shown, this embodiment of the present disclosure provides a display substrate, which includes a third substrate 100, a color filter layer 12, and a protective layer 13. The third substrate 100 has alternating light-shielding areas Q1 and light-transmitting areas Q2.

[0067] Specifically, a pixel defining layer 200 is formed on the third substrate 100. The pixel defining layer 200 has multiple openings, and the OLED light-emitting device E is disposed within the openings of the pixel defining layer 200. (Continue to refer to...) Figure 7 A protective layer 13 is provided on the side of the pixel limiting layer 200 facing away from the third substrate 100, and a color filter layer 12 is provided on the side of the protective layer 13 facing away from the third substrate 100, with the color filter layer 12 in contact with the protective layer 13. The thickness of the color filter layer 12 in the light-shielding region Q1 is greater than the thickness in the light-transmitting region Q2, defining multiple grooves C of the color filter layer 12. The refractive index of the protective layer 13 is greater than the refractive index of the surface of the groove C sidewall that contacts the protective layer 13.

[0068] In this embodiment, by providing a protective layer 13 on the side of the color filter layer 12 facing away from the first substrate 11, and by ensuring that the refractive index of the protective layer material is greater than the refractive index of the surface of the groove C sidewall that contacts the protective layer 13, light emitted by the light-emitting device E illuminates the groove C sidewall and undergoes total internal reflection at the interface where the groove C sidewall contacts the protective layer 13, allowing the light to exit through the light-transmitting region Q2, thereby improving the light extraction efficiency of the display substrate. Furthermore, since the light-emitting device E, the color filter layer 12, and the protective layer 13 are fabricated on the same substrate, the light extraction efficiency of the display substrate can be improved while simultaneously reducing the thickness of the display substrate.

[0069] This disclosure also provides a display device, which includes the aforementioned display substrate (or display panel). The display device can be an electronic device with a display panel, such as a mobile phone, tablet computer, electronic watch, fitness tracker, or laptop computer. The implementation principle and technical effects of this display device can be found in the above discussion of the implementation principle and technical effects of the display substrate, and will not be repeated here.

[0070] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A display panel, characterized in that, include: A display substrate includes: a first substrate having alternating light-shielding areas and light-transmitting areas; a color filter layer disposed on the first substrate, wherein the thickness of the color filter layer in the light-shielding area is greater than the thickness in the light-transmitting area, and defines a plurality of grooves in the color filter layer; and a protective layer disposed on the side of the color filter layer opposite to the first substrate and in contact with the color filter layer; wherein the refractive index of the protective layer is greater than the refractive index of at least the surface of the groove sidewall in contact with the protective layer. A plurality of light-emitting devices and a second substrate, wherein the first substrate and the second substrate are disposed opposite to each other, the plurality of light-emitting devices are disposed on the second substrate, and each light-emitting device is disposed corresponding to the light-transmitting area; A filler material is disposed between the protective layer and the light-emitting device; wherein the refractive index of the filler material is greater than the refractive index of the material of the protective layer.

2. The display panel according to claim 1, characterized in that, The color filter layer includes multiple color filters and a light-shielding component disposed between adjacent color filters; the color filters are disposed in the light-transmitting area, and the light-shielding component is disposed in the light-shielding area.

3. The display panel according to claim 2, characterized in that, The color filter layer includes a first color filter, a second color filter, and a third color filter. The light-shielding component includes a first substructure, a second substructure, and a third substructure stacked together. The first substructure, the second substructure, and the third substructure are made of the same material as the first color filter, the second color filter, and the third color filter, respectively.

4. The display panel according to claim 3, characterized in that, The third substructure covers the sidewall of the second substructure, and the second substructure and the third substructure located in the light-shielding area constitute at least part of the structure of the groove sidewall; the refractive index of the third substructure is less than the refractive index of the protective layer.

5. The display panel according to claim 3, characterized in that, The refractive indices of the first substructure, the second substructure, and the third substructure increase sequentially.

6. The display panel according to claim 3, characterized in that, The thickness of the first substructure is the same as the thickness of the first color filter; the thickness of the second substructure is less than the thickness of the second color filter; the thickness of the third substructure is less than the thickness of the third color filter; and the thickness of the first substructure is less than the thickness of the second substructure; the thickness of the third substructure is less than the thickness of the second substructure.

7. The display panel according to claim 1, characterized in that, The color filter layer includes a plurality of color filters and a black matrix disposed between adjacent color filters; each color filter includes a main color filter portion and a secondary color filter portion surrounding the main color filter portion and at least covering the sidewalls of the black matrix; the black matrix and the secondary color filter portions are located in the light-shielding area; the main color filter portion is located in the light-transmitting area; wherein the thickness of the main color filter portion is less than the thickness of the black matrix.

8. The display panel according to claim 7, characterized in that, The sub-color filter is disposed on the surface of the black matrix opposite to the first substrate; the thickness of the sub-color filter is less than the thickness of the main color filter.

9. The display panel according to claim 1, characterized in that, The display panel also includes a sealing structure, through which the first substrate and the second substrate are fixed together.

10. A display device, characterized in that, It includes the display panel as claimed in any one of claims 1-9.

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