Display substrate and display device

Abstract

The invention provides a display substrate and a display device. The display substrate comprises: a substrate; the plurality of light emitting devices are arranged on the substrate; the quantum dot conversion layer is arranged on one side, far away from the substrate, of the light-emitting device; the quantum dot conversion layer comprises a plurality of quantum dot conversion regions which are arranged at intervals; the plurality of quantum dot conversion areas are arranged in one-to-one correspondence with the plurality of light-emitting devices; a first light adjustment layer and a second light adjustment layer which are at least partially connected are arranged between the light-emitting device and the quantum dot conversion layer; the refractive index of the first light adjustment layer is greater than that of the second light adjustment layer; a contact interface is formed at the junction of the first light adjustment layer and the second light adjustment layer, and the contact interface is configured to reflect at least part of light to a quantum dot conversion region corresponding to the light-emitting device; the light is emitted by the light-emitting device and is incident to the contact interface. Color mixing between adjacent pixel areas can be prevented, meanwhile, the light efficiency of the display device can be improved to a certain degree, and power consumption is reduced.

Description

Technical Field

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

[0002] In order to meet the current demand for high color gamut in the display field and further improve the competitiveness of OLED (Organic Light-Emitting Diode) devices in the display market, the development of display devices with higher color gamut has become a hot topic in current research. QD-OLED (Quantum-dot Light Emitting Diodes) has the advantages of high color gamut, high efficiency, and low brightness attenuation under a wide viewing angle.

[0003] It is of great significance to avoid color mixing of the excitation light source between pixel areas. Summary of the invention

[0004] In view of this, an object of the present application is to provide a display substrate and a display device.

[0005] Based on the above objectives, the present application provides a display substrate, including:

[0006] substrate substrate;

[0007] A plurality of light emitting devices are arranged on the base substrate;

[0008] A quantum dot conversion layer is arranged on a side of the light emitting device away from the substrate; the quantum dot conversion layer comprises a plurality of quantum dot conversion regions arranged at intervals; the plurality of quantum dot conversion regions are arranged in one-to-one correspondence with the plurality of light emitting devices respectively;

[0009] Among them, a first light adjustment layer and a second light adjustment layer that are at least partially connected are arranged between the light-emitting device and the quantum dot conversion layer; the refractive index of the first light adjustment layer is greater than the refractive index of the second light adjustment layer; the junction of the first light adjustment layer and the second light adjustment layer forms a contact interface, and the contact interface is configured to reflect at least part of the light to the quantum dot conversion area corresponding to the light-emitting device; the light is the light emitted by the light-emitting device and incident on the contact interface.

[0010] In some embodiments, the first light adjustment layer is arranged on a side of the light emitting device away from the base substrate; the first light adjustment layer includes a plurality of first light adjustment units arranged at intervals; the plurality of first light adjustment units are arranged one-to-one corresponding to the plurality of light emitting devices; the second light adjustment layer is arranged on a side of the first light adjustment layer away from the base substrate, and is filled between adjacent first light adjustment units;

[0011] The contact interface is formed at the junction of the first light adjustment unit and the second light adjustment layer, and the contact interface is configured to reflect part of the light to the quantum dot conversion region corresponding to the light emitting device and refract part of the light to the adjacent first light adjustment unit.

[0012] In some embodiments, the first light adjustment layer includes a plurality of first light adjustment units arranged at intervals; the plurality of first light adjustment units are arranged one-to-one corresponding to the plurality of light emitting devices; the second light adjustment layer includes a plurality of second light adjustment units arranged at intervals; the second light adjustment units are filled between adjacent first light adjustment units;

[0013] The junction between the second light adjustment unit and the adjacent first light adjustment unit forms the contact interface; the contact interface is configured to reflect part of the light to the quantum dot conversion area corresponding to the light emitting device, and refract part of the light into the adjacent first light adjustment unit.

[0014] In some embodiments, the second light adjustment layer is disposed on a side of the light emitting device away from the base substrate, and includes a plurality of second light adjustment units disposed at intervals; there is a spacing area between adjacent second light adjustment units; the orthographic projection of the spacing area on the base substrate overlaps with the orthographic projection of the light emitting device on the base substrate;

[0015] The first light adjustment layer is at least filled in the spacer area, and the interface between the first light adjustment layer and the second light adjustment unit forms the contact interface; the contact interface is also configured to reflect part of the light to the quantum dot conversion area corresponding to the light emitting device.

[0016] In some embodiments, in the second light adjustment unit, the contact interface has a slope angle; the slope angle is an acute angle, satisfying Among them, L1 is the width of the light-emitting layer in the light-emitting device, L2 is the width of the second light adjustment layer close to the surface of the base substrate; L3 is the thickness of the first light adjustment layer; t is the thickness of the second light adjustment unit, and θ is the slope angle.

[0017] In some embodiments, the first light adjustment layer is disposed on a side of the second light adjustment layer away from the base substrate and filled in the spacer; the cross-sectional shape of the second light adjustment unit is a trapezoid; the thickness of the second light adjustment unit is less than the thickness of the first light adjustment layer;

[0018] The quantum dot conversion layer also includes a shading area arranged between adjacent quantum dot conversion areas; the contact interface is also configured to reflect part of the light to the adjacent shading area; the adjacent shading area is a shading area adjacent to the quantum dot conversion area corresponding to the light-emitting device.

[0019] In some embodiments, the first light adjustment layer includes a plurality of third light adjustment units; the third light adjustment units are disposed in the spacing area; the junction between the third light adjustment units and the second light adjustment units forms the contact interface;

[0020] The cross-sectional shape of the second light adjustment unit is a regular trapezoid or a triangle; the cross-sectional shape of the third light adjustment unit is an inverted trapezoid.

[0021] In some embodiments, the thickness of the first light adjusting layer is smaller than the thickness of the second light adjusting layer.

[0022] In some embodiments, the thickness of the first light adjusting layer is the same as the thickness of the second light adjusting layer.

[0023] In some embodiments, the thickness of the first light adjusting layer is greater than the thickness of the second light adjusting layer.

[0024] In some embodiments, the quantum dot conversion layer further includes a light shielding area disposed between adjacent quantum dot conversion areas; the contact interface is further used to refract at least part of the light to the adjacent light shielding area; the adjacent light shielding area is a light shielding area adjacent to the quantum dot conversion area corresponding to the light emitting device;

[0025] The display substrate also includes an encapsulation layer arranged on the side of the quantum dot conversion layer away from the base substrate and a color filter layer arranged on the side of the encapsulation layer away from the base substrate, the color filter layer includes a plurality of color filter filters, and the plurality of color filter filters are respectively arranged in one-to-one correspondence with the plurality of light-emitting devices.

[0026] An embodiment of the present application further provides a display device, comprising a display substrate as described in any of the preceding items.

[0027] From the above description, it can be seen that the display substrate and display device provided by the present application can convert the blue light that is re-incident to the quantum dot conversion area corresponding to the light-emitting device into red light and green light respectively, thereby preventing color mixing between adjacent pixel areas, and at the same time can also improve the light efficiency of the display device to a certain extent and reduce power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1A schematic diagram of the structure of a display substrate according to an embodiment of the present application;

[0030] Figure 2 is another structural schematic diagram of a display substrate according to an embodiment of the present application;

[0031] Figure 3 is another structural schematic diagram of a display substrate according to an embodiment of the present application;

[0032] Figure 4 is another structural schematic diagram of a display substrate according to an embodiment of the present application;

[0033] Figure 5 is another structural schematic diagram of a display substrate according to an embodiment of the present application;

[0034] Figure 6 is another structural schematic diagram of a display substrate according to an embodiment of the present application;

[0035] Figure 7 is another structural schematic diagram of a display substrate according to an embodiment of the present application;

[0036] Figure 8 This is another schematic structural diagram of a display substrate according to an embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0038] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] QD-OLED based on inkjet printing has the characteristics of low cost and few process steps, and has advantages in the field of medium and large-sized displays. In related technologies, QD-OLED uses blue light to excite the quantum dot layer, which is then converted into red and green light, while transmitting blue light to achieve a full-color picture.

[0040] In the related art, in order to prevent the blue excitation light source from being incident on the color conversion layer (such as the quantum dot conversion layer) and the transmission layer of the adjacent pixel area, a black matrix BM is usually used to absorb the blue light incident on the adjacent color conversion layer to prevent color mixing between pixel areas. In this way, although color mixing between pixel areas can be prevented to a certain extent, the blue light entering the adjacent color conversion layer is directly absorbed, which will reduce the luminous efficiency to a certain extent.

[0041] Based on this, the embodiment of the present application provides a display substrate and a display device, by setting a light adjustment layer with different refractive index between the light emitting device and the color conversion layer (such as a quantum dot conversion layer), a high-low refractive pattern interface is formed, and part of the blue light that is to be incident on the adjacent color conversion layer is totally reflected on the interface, so that the blue light is re-incident to the corresponding color conversion layer, and the re-incident blue light can be converted into red light and green light respectively, thereby improving the luminous efficiency of the display device and reducing the function; at the same time, color mixing between pixel areas is prevented. In addition, there is no need to set a black light-shielding layer at the color filter layer, which can also improve the luminous efficiency to a certain extent.

[0042] like Figure 1 As shown, an embodiment of the present application provides a display substrate, which may include:

[0043] Base substrate 1;

[0044] A plurality of light emitting devices 2 are arranged on the base substrate 1;

[0045] The quantum dot conversion layer 5 is arranged on a side of the light emitting device 2 away from the base substrate 1; the quantum dot conversion layer 5 may include a plurality of quantum dot conversion regions arranged at intervals; the plurality of quantum dot conversion regions are arranged one-to-one correspondingly to the plurality of light emitting devices 2. Generally, the orthographic projection of the quantum dot conversion region on the base substrate 1 overlaps with the orthographic projection of the light emitting device 2 on the base substrate 1.

[0046] Among them, Figure 3 and Figure 1 As shown, a first light adjustment layer 3 and a second light adjustment layer 4 at least partially connected are arranged between the light emitting device 2 and the quantum dot conversion layer 5; the refractive index n1 of the first light adjustment layer 3 is greater than the refractive index n2 of the second light adjustment layer 4; the boundary between the first light adjustment layer 3 and the second light adjustment layer 4 forms a contact interface, and the contact interface is configured to reflect at least part of the light to the quantum dot conversion area corresponding to the light emitting device 2; the light is the light emitted by the light emitting device 2 and incident on the contact interface. Generally, the first light adjustment layer 3 and the second light adjustment layer 4 can be arranged around the light emitting device 2 respectively.

[0047] The display substrate provided by the embodiment of the present application is provided with a base substrate 1; a plurality of light-emitting devices 2 are provided on the base substrate 1; a quantum dot conversion layer 5 is provided on a side of the light-emitting device 2 away from the base substrate 1; the quantum dot conversion layer 5 includes a plurality of quantum dot conversion regions arranged at intervals; the plurality of quantum dot conversion regions are respectively arranged in one-to-one correspondence with the plurality of light-emitting devices 2; wherein, a first light adjustment layer 3 and a second light adjustment layer 4 at least partially connected are provided between the light-emitting device 2 and the quantum dot conversion layer 5; the refractive index of the first light adjustment layer 3 is greater than the refractive index of the second light adjustment layer 4; the junction of the first light adjustment layer 3 and the second light adjustment layer 4 forms a contact interface, and the contact interface is configured to reflect at least part of the light to the quantum dot conversion region corresponding to the light-emitting device 2; the light is the light emitted by the light-emitting device 2 and incident on the contact interface, and at least part of the light emitted by the light-emitting device 2 and incident on the contact interface can be re-incident to the corresponding color conversion layer. In this way, the blue light re-incident to the quantum dot conversion area corresponding to the light-emitting device 2 can be converted into red light and green light respectively, thereby preventing color mixing between adjacent pixel areas, and at the same time improving the light efficiency of the display device and reducing power consumption to a certain extent.

[0048] In some embodiments, the substrate 1 may be a rigid substrate 1, which may be glass or quartz, etc. The substrate 1 may also be a flexible substrate 1, which may be polyimide (PI) or other flexible materials.

[0049] In some embodiments, a driving control layer may be provided on the base substrate 1, and the driving control layer includes a data line (eg, a data signal line) connected to an external circuit and a plurality of switching elements, wherein the switching elements may include source / drain electrodes.

[0050] In some embodiments, such as Figure 1 As shown, a plurality of light emitting devices 2 may be arranged in an array on the base substrate 1. The display substrate may further include a pixel defining layer 22, the pixel defining layer 22 having an opening, the opening being used to define the light emitting device 2. The light emitting device 2 (e.g., a blue organic electroluminescent device 2) may include an anode, a first color (e.g., blue) light emitting layer, and a cathode, and is configured to emit light of a first color (e.g., blue).

[0051] In some embodiments, such as Figure 1As shown, the quantum dot conversion layer 5 may further include a shading area 52 disposed between adjacent quantum dot conversion areas. Typically, the material of the shading area 52 may be a light-proof material, and its optical density (OD value, Optical Density) may be greater than 4 to better block the incident light. The specific material may be a black photoresist material BM, etc. The contact interface is also used to refract at least part of the light to an adjacent shading area 52; the adjacent shading area 52 is a shading area 52 adjacent to the quantum dot conversion area corresponding to the light-emitting device 2.

[0052] In some embodiments, the edge of the orthographic projection of the quantum dot conversion region on the substrate 1 may exceed the edge of the orthographic projection of the light emitting device 2 on the substrate 1. In this way, a better light conversion effect can be achieved. The multiple quantum dot conversion regions may include a quantum dot conversion region (e.g., a first quantum dot conversion region 51a or a second quantum dot conversion region 51b) that converts the light (e.g., blue) emitted by the light emitting device 2 into other colors (e.g., red or green), and may also include a quantum dot conversion region (e.g., a third quantum dot conversion region 51c) that transmits the light (e.g., blue) emitted by the light emitting device 2.

[0053] In some embodiments, a flat layer may be provided on a side of the light emitting device 2 away from the substrate 1, and the flat layer is used to achieve flattening. The first light adjustment layer 3 may be provided on the flat layer. The flat layer and the first light adjustment layer 3 may be made of the same material.

[0054] In some embodiments, such as Figure 1As shown, the first light adjustment layer 3 may include a side of the light emitting device 2 away from the base substrate 1. The first light adjustment layer 3 may include a plurality of first light adjustment units 34 arranged at intervals. Generally, the plurality of first light adjustment units 34 are arranged one-to-one with the plurality of light emitting devices 2. The orthographic projection of the first light adjustment unit 34 on the base substrate 1 may overlap with the orthographic projection of the light emitting device 2 on the base substrate 1. For example, the edge of the orthographic projection of the first light adjustment unit 34 on the base substrate 1 may exceed the edge of the orthographic projection of the light emitting device 2 on the base substrate 1, that is, the size of the first light adjustment unit 34 may be slightly larger than the light emitting device 2, and the light emitted by the corresponding light emitting device 2 may be received in a larger range, and refracted and reflected, so that the light output utilization rate of the light emitting device 2 may be higher. The second light adjustment layer 4 may be arranged on the side of the first light adjustment layer 3 away from the base substrate 1, and filled between adjacent first light adjustment units 34. The spacing area between adjacent first light adjustment units 34 may coincide with the edge of the orthographic projection of the substrate 1 at the narrowest point of the second light adjustment layer 4 in the first direction (e.g., in a direction parallel to the substrate 1) on the substrate 1. In this way, a contact interface is formed at the junction between each first light adjustment unit 34 and the second light adjustment layer 4, and each light-emitting device 2 may have a corresponding light-emitting interface. That is, the junction between the first light adjustment unit 34 and the second light adjustment layer 4 forms the contact interface. The contact interface is configured to reflect part of the light (i.e., the light emitted by the light-emitting device 2 and incident on the contact interface) to the quantum dot conversion area corresponding to the light-emitting device 2; refract part of the light into the adjacent first light adjustment unit 34 or refract part of the light into the adjacent light-shielding area 52. The adjacent first light adjustment unit 34 is a first light adjustment unit 34 adjacent to the first light adjustment unit 34 corresponding to the light-emitting device 2, and the adjacent light-shielding area 52 is a light-shielding area 52 adjacent to the light-shielding area 52 corresponding to the light-emitting device 2.

[0055] In some embodiments, the shape of the contact interface can be regular or irregular. Figure 1, exemplarily, the cross-sectional shape of the contact interface may be a rectangle with one side missing, and may include a first contact interface 31, a second contact interface 32, and a third contact interface 33 connected in sequence. The first contact interface 31 and the third contact interface 33 may be parallel to the thickness direction of the first light adjustment layer 3, and the second contact interface 32 may be perpendicular to the thickness direction of the first light adjustment layer 3. On the first contact interface 31, part of the light emitted by the light emitting device 2 and incident on the first contact interface 31 may be totally reflected, for example, reflected to the second contact interface 32, and re-incident to the corresponding quantum dot conversion area to form a light path 41a, which is converted into red or green in the quantum dot conversion area, thereby improving the utilization rate of blue light. On the first contact interface 31, part of the light emitted by the light emitting device 2 and incident on the first contact interface 31 can also be refracted, for example, after refraction, it enters the adjacent second light adjustment part, and refracts again into the adjacent first light adjustment unit 34 (that is, the first light adjustment unit 34 arranged adjacent to the first light adjustment unit 34, for example, arranged in the first light adjustment unit 34), through a refraction angle lower than the incident angle, to form a light path 42; or after refraction, it enters the adjacent light shielding area 52, through a refraction angle lower than the incident angle, to form a light path 43. The adjacent light shielding area 52 is a light shielding area 52 adjacent to the quantum dot conversion area corresponding to the light emitting device 2, and is absorbed by the light shielding area 52. In this way, the situation that the blue light emitted by the light emitting device 2 enters the adjacent color conversion layer (for example, the adjacent quantum dot conversion area) will not occur or the probability of occurrence is significantly reduced, which can prevent the occurrence of color mixing, and at the same time, the light efficiency of the display device can be improved to a certain extent.

[0056] In some of these embodiments, reference Figure 1 As shown, the thickness of the first light adjustment layer 3 may be less than the thickness of the second light adjustment layer 4. Generally, after the first light adjustment layer 3 is prepared, a related process (dry etching or exposure and development process) may be performed to form a patterned first light adjustment layer 3 to obtain a plurality of first light adjustment units 34 arranged at intervals. Then, the second light adjustment layer 4 is deposited on the side of the first light adjustment layer 3 away from the base substrate 1.

[0057] In some of these embodiments, reference Figure 2As shown, the first light adjustment layer 3 may include a plurality of first light adjustment units 34 arranged at intervals. The plurality of first light adjustment units 34 may be arranged one-to-one with the plurality of light emitting devices 2, respectively. Generally, the orthographic projection of the first light adjustment unit 34 on the substrate 1 may overlap with the orthographic projection of the light emitting device 2 on the substrate 1. For example, the edge of the orthographic projection of the first light adjustment unit 34 on the substrate 1 may exceed the edge of the orthographic projection of the light emitting device 2 on the substrate 1, that is, the size of the first light adjustment unit 34 may be slightly larger than the light emitting device 2, and may receive the light emitted by the corresponding light emitting device 2 in a larger range, and refract and reflect, so that the light output utilization rate of the light emitting device 2 may be higher. The second light adjustment layer 4 may include a plurality of second light adjustment units 41 arranged at intervals. The second light adjustment unit 41 may be filled between adjacent first light adjustment units 34. The spacing area between adjacent first light adjustment units 34 may overlap with the edge of the orthographic projection of the substrate 1 at the edge of the orthographic projection of the substrate 1 at the edge of the orthographic projection of the second light adjustment unit 41 on the substrate 1. In this way, a contact interface is formed at the junction between each first light adjustment unit 34 and the second light adjustment unit 41, and each light-emitting device 2 can have a corresponding light-emitting interface. That is, the junction between the first light adjustment unit 34 and the second light adjustment unit 41 forms the contact interface. The contact interface is configured to reflect part of the light (that is, the light emitted by the light-emitting device 2 and incident on the contact interface) to the quantum dot conversion area corresponding to the light-emitting device 2; refract part of the light into the adjacent first light adjustment unit 34 or refract part of the light into the adjacent shading area 52. Among them, the adjacent first light adjustment unit 34 is a first light adjustment unit 34 adjacent to the first light adjustment unit 34 corresponding to the light-emitting device 2, and the adjacent shading area 52 is a shading area 52 adjacent to the shading area 52 corresponding to the light-emitting device 2.

[0058] In some embodiments, the shape of the contact interface can be regular or irregular. Figure 2, exemplarily, the cross-sectional shape of the contact interface can be a straight line, for example, it can include two parallel straight lines. On the contact interface, part of the light emitted by the light emitting device 2 and incident on the first contact interface 31 can be totally reflected, for example, reflected to the interface close to the quantum dot conversion zone, and re-incident to the corresponding quantum dot conversion zone to form a light path 44, which is converted to red or green in the quantum dot conversion zone, which can improve the utilization rate of blue light. On the contact interface, part of the light emitted by the light emitting device 2 and incident on the contact interface can also be refracted, for example, after refraction, it enters the adjacent second light adjustment unit 41, and refracts again into the adjacent first light adjustment unit 34 (that is, the first light adjustment unit 34 arranged adjacent to the first light adjustment unit 34), and forms a light path 45 through a refraction angle lower than the incident angle; or after refraction, it enters the adjacent shading area 52, and forms a light path 46 through a refraction angle lower than the incident angle. Wherein, the adjacent shading area 52 is a shading area 52 adjacent to the quantum dot conversion area corresponding to the light emitting device 2, and is absorbed by the shading area 52. In this way, the blue light emitted by the light-emitting device 2 will not enter the adjacent color conversion layer (such as the adjacent quantum dot conversion area) or the probability of this happening will be significantly reduced, which can prevent color mixing and improve the light efficiency of the display device to a certain extent.

[0059] In some of these embodiments, reference Figure 2 As shown, the thickness of the first light adjustment layer 3 can be equal to the thickness of the second light adjustment layer 4. Generally, after the first light adjustment layer 3 is prepared, a related process (dry etching or exposure and development process) can be performed to form a patterned first light adjustment layer 3 to obtain a plurality of first light adjustment units 34 arranged at intervals. Then, the second light adjustment unit 41 is formed by deposition on the side of the first light adjustment layer 3 away from the base substrate 1. Alternatively, after the second light adjustment layer 4 is prepared, a related process (dry etching or exposure and development process) can be performed to form a patterned second light adjustment layer 4 to obtain a plurality of second light adjustment units 41 arranged at intervals. Then, the first light adjustment unit 34 is formed by deposition on the side of the second light adjustment layer 4 away from the base substrate 1.

[0060] In some of these embodiments, reference Figure 3As shown, the second light adjustment layer 4 can be arranged on the side of the light emitting device 2 away from the base substrate 1, and includes a plurality of second light adjustment units 41 arranged at intervals. There is a spacing area between adjacent second light adjustment units 41. Generally, the plurality of spacing areas are arranged one by one with the plurality of light emitting devices 2. The orthographic projection of the spacing area on the base substrate 1 can overlap with the orthographic projection of the light emitting device 2 on the base substrate 1. For example, the edge of the orthographic projection of the spacing area on the base substrate 1 can exceed the edge of the orthographic projection of the light emitting device 2 on the base substrate 1, that is, the size of the spacing area can be slightly larger than the light emitting device 2, so that the size of the narrowest part of the first light adjustment layer 3 is slightly larger than the light emitting device 2, so that the light emitted by the corresponding light emitting device 2 can be received in a larger range, and refracted and reflected, so that the light output utilization rate of the light emitting device 2 can be higher. The first light adjustment layer 3 can be arranged on the side of the second light adjustment layer 4 away from the base substrate 1, and filled between adjacent second light adjustment units 41. The edge of the orthographic projection of the substrate 1 between the adjacent second light adjustment units 41 may coincide with the edge of the orthographic projection of the substrate 1 at the narrowest point of the first light adjustment layer 3 in the first direction (e.g., the direction parallel to the substrate 1). The first light adjustment layer 3 is at least filled in the spacer, and the interface between the first light adjustment layer 3 and the second light adjustment unit 41 forms the contact interface. In this way, a contact interface is formed at the interface between each second light adjustment unit 41 and the first light adjustment layer 3, and each light-emitting device 2 may have a corresponding light-emitting interface. That is, the interface between the second light adjustment unit 41 and the first light adjustment layer 3 forms the contact interface. The contact interface is configured to reflect part of the light (that is, the light emitted by the light-emitting device 2 and incident on the contact interface) to the quantum dot conversion area corresponding to the light-emitting device 2; and reflect part of the light to the adjacent light-shielding area 52. Among them, the adjacent light-shielding area 52 is a light-shielding area 52 adjacent to the light-shielding area 52 corresponding to the light-emitting device 2.

[0061] In some embodiments, the shape of the contact interface can be regular or irregular. Figure 3, exemplarily, the second light adjustment unit 41 may be a regular trapezoid. The cross-sectional shape of the contact interface may be a regular trapezoid with one side missing, and may include a first contact interface 31, a second contact interface 32 and a third contact interface 33 connected in sequence. Among them, the second contact interface 32 may be parallel to the surface of the substrate 1, and the first contact interface 31 and the third contact interface 33 may be respectively arranged on both sides of the second contact interface 32 in the first direction. On the first contact interface 31 or the third contact interface 33, part of the light emitted by the light-emitting device 2 and incident on the first contact interface 31 may be totally reflected and re-incident into the corresponding quantum dot conversion area to form a light path 47a or a light path 48a, and converted into red or green in the quantum dot conversion area, which can improve the utilization rate of blue light. On the first contact interface 31, part of the light emitted by the light-emitting device 2 and incident on the first contact interface 31 may also be reflected into the adjacent shading area 52 to form a light path 47b. Among them, the adjacent shading area 52 is a shading area 52 adjacent to the quantum dot conversion area corresponding to the light-emitting device 2, and is absorbed by the shading area 52. On the first contact interface 31, the light emitted by the light emitting device 2 can also be directly transmitted to the shading area 52 adjacent to the quantum dot conversion area corresponding to the light emitting device 2, forming a light path 49. In this way, the blue light emitted by the light emitting device 2 will not enter the adjacent color conversion layer (for example, the adjacent quantum dot conversion area) or the probability of occurrence is significantly reduced, which can prevent the occurrence of color mixing and improve the light efficiency of the display device to a certain extent.

[0062] In some of these embodiments, reference Figure 3 As shown, the thickness of the first light adjustment layer 3 may be greater than the thickness of the second light adjustment layer 4. Generally, after the second light adjustment layer 4 is prepared, a related process (dry etching or exposure and development process) may be performed to form a patterned second light adjustment layer 4 to obtain a plurality of second light adjustment units 41 disposed at intervals. Afterwards, the first light adjustment layer 3 is deposited on the side of the second light adjustment layer 4 away from the base substrate 1.

[0063] In some of these embodiments, reference Figure 6 As shown, in the second light adjustment unit 41, the contact interface has a slope angle, and the slope angle is an acute angle. The slope angle satisfies Wherein, L1 is the pixel width (that is, the width of the light emitting device 2), L2 is the width of the second light adjustment layer 4 close to the surface of the substrate 1; L3 is the thickness of the first light adjustment layer 3; t is the thickness of the second light adjustment unit 41, and θ is the slope angle. At this time, the contact interface can directly transmit the light emitted by the light emitting device 2 to the adjacent shading area 52; the adjacent shading area 52 is the shading area 52 adjacent to the quantum dot conversion area corresponding to the light emitting device 2. It is the critical condition that is approximately satisfied when the light source on the left (right) side of the light emitting device 2 does not enter the adjacent quantum dot conversion area. At this time, it can simultaneously take into account the good effects of improving the conversion efficiency of blue light and avoiding color mixing.

[0064] In practical applications, under the premise that the pixel width L1, the bottom width L2 of the second light adjustment layer 4 and the thickness L3 between the light emitting device 2 and the quantum dot conversion layer 5 remain unchanged, the height t and the slope angle θ of the regular trapezoidal structure can be adjusted according to actual conditions. Generally, the height and slope angle of the regular trapezoidal structure can be adjusted according to specific needs. For example, under the premise that the height t remains unchanged, the slope angle θ is reduced (for example Figure 5 ), the probability of total reflection of blue light incident on the contact interface (i.e., high-low folding interface) can be further increased, and at this time, the luminous efficiency is higher and the power consumption is lower. However, correspondingly, the amount of blue light incident on the adjacent color conversion layer directly through the first light adjustment layer 3 (i.e., high folding layer) without passing through the contact interface (i.e., high-low folding interface) may also increase, and color mixing may occur relatively easily. Under the premise that the slope angle θ remains unchanged, increasing the height t of the positive trapezoid (e.g. Figure 4 ), the amount of blue light incident on the adjacent color conversion layer will be reduced accordingly, which can better avoid color mixing.

[0065] In some of these embodiments, reference Figure 4 and Figure 5 As shown, the first light adjustment layer 3 may include a plurality of third light adjustment units 35. The third light adjustment unit 35 may be arranged in the spacing area, and the boundary between the third light adjustment unit 35 and the second light adjustment unit 41 may form the contact interface. The edge of the orthographic projection of the third light adjustment unit 35 on the base substrate 1 may coincide with the edge of the orthographic projection of the spacing area / the second light adjustment unit 41 on the base substrate 1. That is, the boundary between each third light adjustment unit 35 and each second light adjustment unit 41 respectively forms the contact interface.

[0066] In some of the embodiments, the edge of the orthographic projection of the third light adjustment unit 35 on the base substrate 1 may exceed the edge of the orthographic projection of the light-emitting device 2 on the base substrate 1, that is, the size of the third light adjustment unit 35 may be slightly larger than the light-emitting device 2, and may receive the light emitted by the corresponding light-emitting device 2 in a larger range, and refract and reflect it, thereby enabling higher light utilization of the light-emitting device 2.

[0067] In some embodiments, the shape of the contact interface can be regular or irregular. Figure 4 and Figure 5 As shown, exemplarily, the cross-sectional shape of the second light adjustment unit 41 may be a regular trapezoid or a triangle. The cross-sectional shape of the third light adjustment unit 35 may be adapted to the interface shape of the second light adjustment unit 41. The cross-sectional shape of the third light adjustment unit 35 is an inverted trapezoid.

[0068] In some of these embodiments, reference Figure 4 and Figure 5 As shown, the thickness of the second light adjustment unit 41 and the third light adjustment unit 35 can be the same. That is, the thickness of the first light adjustment layer 3 and the thickness of the second light adjustment layer 4 can be the same. Generally, after the second light adjustment layer 4 is prepared, a related process (dry etching or exposure and development process) can be performed to form a patterned second light adjustment layer 4 to obtain a plurality of second light adjustment units 41 arranged at intervals. Afterwards, the first light adjustment layer 3 is deposited on the side of the second light adjustment layer 4 away from the base substrate 1, that is, a plurality of third light adjustment units 35 are formed.

[0069] In some of these embodiments, reference Figure 6 and Figure 7 , the thickness of the second light adjustment unit 41 and the third light adjustment unit 35 may be different. The thickness of the second light adjustment unit 41 may be less than the thickness of the third light adjustment unit 35. That is, the thickness of the second light adjustment unit 41 may be less than the thickness of the first light adjustment layer 3. The second light adjustment unit 41 may be in a triangular shape or the like. In some possible embodiments, the shape of the second light adjustment unit may be as follows: Figure 8 Shapes such as arcs shown.

[0070] In some embodiments, the materials of the first light adjustment layer 3 and the second light adjustment layer 4 can both be OC materials. The OC in the first light adjustment layer 3 can include resin and zirconium oxide, and the OC in the second light adjustment layer 4 can include resin and Si particles.

[0071] In some embodiments, the refractive index of the first light adjustment layer 3 and the second light adjustment layer 4 satisfies: arcsin(n1 / n2)≤θ<90°. Where n1 is the refractive index of the first light adjustment layer 3; n2 can be the refractive index of the second light adjustment layer 4. θ is the slope angle of the contact interface.

[0072] In some embodiments, the display substrate may further include an encapsulation layer and a color filter layer arranged on the side of the quantum dot conversion layer 5 away from the base substrate 1. The encapsulation layer is used to block the intrusion of water vapor. The color filter layer may include a plurality of color filter filters, and the plurality of color filter filters are respectively arranged in a one-to-one correspondence with the plurality of light-emitting devices 2. The color filter layer may include a plurality of color filter units, and the color filter unit may include a first color filter 71, a second color filter 72 and a third color filter 73. Exemplarily, the red light transferred out through the quantum dot conversion layer 5 passes through the first color filter 71, the green light transferred out through the quantum dot conversion layer 5 passes through the second color filter 72, and the blue light of the excitation light source directly passes through the third color filter 73 to form a full-color display.

[0073] In some of the embodiments, the orthographic projection of the color filter (e.g., the first color filter 71, the second color filter 72, or the third color filter 73) on the substrate 1 may cover the orthographic projection of the corresponding quantum dot conversion region (e.g., the first quantum dot conversion region 51a, the second quantum dot conversion region 51b, or the third quantum dot conversion region 51c) on the substrate 1. The orthographic projection of the quantum dot conversion region (e.g., the first quantum dot conversion region 51a, the second quantum dot conversion region 51b, or the third quantum dot conversion region 51c) on the substrate 1 may cover the orthographic projection of the corresponding light emitting device 2 on the substrate 1.

[0074] The display substrate provided in the embodiment of the present application can improve light efficiency and block color mixing between pixel areas by fully reflecting the blue light that is about to be incident on the adjacent pixel area. Therefore, the color matching and color reproducibility of the pixel area can be improved, and power consumption can be reduced. There is no need to set a light shielding layer, such as a black matrix, in the color filter layer.

[0075] Based on the same inventive concept, corresponding to the display substrate of any of the above embodiments, the present application also provides a display device.

[0076] The display device of the above embodiment has the corresponding display substrate in any of the above embodiments, and has the beneficial effects of the corresponding display substrate embodiment, which will not be described in detail here.

[0077] It should be noted that the display device in the embodiments of the present application may be any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a laptop computer, a digital photo frame, and a navigator.

[0078] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0079] In addition, to simplify the description and discussion, and in order not to make the embodiments of the present application difficult to understand, the known power supply / ground connection with the integrated circuit (IC) chip and other components may or may not be shown in the provided drawings. In addition, the device can be shown in the form of a block diagram to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation of these block diagram devices are highly dependent on the platform to be implemented in the embodiments of the present application (that is, these details should be fully within the scope of understanding of those skilled in the art). In the case of elaborating specific details (e.g., circuits) to describe exemplary embodiments of the present application, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details or when these specific details are changed. Therefore, these descriptions should be considered to be illustrative rather than restrictive.

[0080] Although the present application has been described in conjunction with specific embodiments of the present application, many replacements, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may use the embodiments discussed.

[0081] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A display substrate, characterized in that: include: substrate substrate; A plurality of light emitting devices are arranged on the base substrate; A quantum dot conversion layer is arranged on a side of the light emitting device away from the substrate; the quantum dot conversion layer comprises a plurality of quantum dot conversion regions arranged at intervals; the plurality of quantum dot conversion regions are arranged in one-to-one correspondence with the plurality of light emitting devices respectively; Among them, a first light adjustment layer and a second light adjustment layer that are at least partially connected are arranged between the light-emitting device and the quantum dot conversion layer; the refractive index of the first light adjustment layer is greater than the refractive index of the second light adjustment layer; the junction of the first light adjustment layer and the second light adjustment layer forms a contact interface, and the contact interface is configured to reflect at least part of the light to the quantum dot conversion area corresponding to the light-emitting device; the light is the light emitted by the light-emitting device and incident on the contact interface.

2. The display substrate according to claim 1, characterized in that: The first light adjustment layer is arranged on a side of the light emitting device away from the base substrate; the first light adjustment layer comprises a plurality of first light adjustment units arranged at intervals; the plurality of first light adjustment units are arranged one-to-one corresponding to the plurality of light emitting devices; the second light adjustment layer is arranged on a side of the first light adjustment layer away from the base substrate, and is filled between adjacent first light adjustment units; The contact interface is formed at the junction of the first light adjustment unit and the second light adjustment layer, and the contact interface is configured to reflect part of the light to the quantum dot conversion region corresponding to the light emitting device and refract part of the light to the adjacent first light adjustment unit.

3. The display substrate according to claim 1, characterized in that: The first light adjustment layer comprises a plurality of first light adjustment units arranged at intervals; the plurality of first light adjustment units are arranged one-to-one corresponding to the plurality of light emitting devices; the second light adjustment layer comprises a plurality of second light adjustment units arranged at intervals; the second light adjustment units are filled between adjacent first light adjustment units; The junction between the second light adjustment unit and the adjacent first light adjustment unit forms the contact interface; the contact interface is configured to reflect part of the light to the quantum dot conversion area corresponding to the light emitting device, and refract part of the light into the adjacent first light adjustment unit.

4. The display substrate according to claim 1, characterized in that: The second light adjustment layer is arranged on a side of the light emitting device away from the base substrate, and includes a plurality of second light adjustment units arranged at intervals; there is a spacing area between adjacent second light adjustment units; the orthographic projection of the spacing area on the base substrate overlaps with the orthographic projection of the light emitting device on the base substrate; The first light adjustment layer is at least filled in the spacer area, and the interface between the first light adjustment layer and the second light adjustment unit forms the contact interface; the contact interface is also configured to reflect part of the light to the quantum dot conversion area corresponding to the light emitting device.

5. The display substrate according to claim 4, characterized in that: In the second light adjustment unit, the contact interface has a slope angle; the slope angle is an acute angle, satisfying Among them, L1 is the width of the light-emitting layer in the light-emitting device, L2 is the width of the second light adjustment layer close to the surface of the base substrate; L3 is the thickness of the first light adjustment layer; t is the thickness of the second light adjustment unit, and θ is the slope angle.

6. The display substrate according to claim 4, characterized in that: The first light adjustment layer is disposed on a side of the second light adjustment layer away from the base substrate and is filled in the spacing area; the cross-sectional shape of the second light adjustment unit is a trapezoid; the thickness of the second light adjustment unit is less than the thickness of the first light adjustment layer; The quantum dot conversion layer also includes a shading area arranged between adjacent quantum dot conversion areas; the contact interface is also configured to reflect part of the light to the adjacent shading area; the adjacent shading area is a shading area adjacent to the quantum dot conversion area corresponding to the light-emitting device.

7. The display substrate according to claim 4, characterized in that: The first light adjustment layer includes a plurality of third light adjustment units; the third light adjustment units are arranged in the spacing area; the junction between the third light adjustment units and the second light adjustment units forms the contact interface; The cross-sectional shape of the second light adjustment unit is a regular trapezoid or a triangle; the cross-sectional shape of the third light adjustment unit is an inverted trapezoid.

8. The display substrate according to claim 2, characterized in that: The thickness of the first light adjustment layer is smaller than the thickness of the second light adjustment layer.

9. The display substrate according to claim 3 or 7, characterized in that: The thickness of the first light adjustment layer is the same as the thickness of the second light adjustment layer.

10. The display substrate according to claim 6 or 7, characterized in that: The thickness of the first light adjustment layer is greater than the thickness of the second light adjustment layer.

11. The display substrate according to any one of claims 1 to 3, characterized in that: The quantum dot conversion layer further includes a light shielding area arranged between adjacent quantum dot conversion areas; the contact interface is also used to refract at least part of the light to the adjacent light shielding area; the adjacent light shielding area is a light shielding area adjacent to the quantum dot conversion area corresponding to the light emitting device; The display substrate also includes an encapsulation layer arranged on the side of the quantum dot conversion layer away from the base substrate and a color filter layer arranged on the side of the encapsulation layer away from the base substrate, the color filter layer includes a plurality of color filter filters, and the plurality of color filter filters are respectively arranged in one-to-one correspondence with the plurality of light-emitting devices.

12. A display device comprising the display substrate according to any one of claims 1 to 11.

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