Light-emitting substrate and display device

Abstract

The application discloses a light-emitting substrate and a display device. The light-emitting substrate comprises a substrate, a driving circuit layer arranged on one side of the substrate, a flat layer arranged on the side of the driving circuit layer away from the substrate, a first surface of the flat layer being provided with a plurality of concave surfaces, the first surface being the surface away from the substrate, a light-emitting layer arranged on the side of the flat layer provided with the plurality of concave surfaces, the light-emitting layer comprising a main light-emitting area and an auxiliary light-emitting area, the main light-emitting area being located on the side wall of the concave surface, the auxiliary light-emitting area being located on the bottom of the concave surface and the intersection area of two adjacent concave surfaces, a filter layer arranged between the driving circuit layer and the flat layer, the filter layer comprising a first filter part and a second filter part, the first filter part being used for filtering light emitted by the main light-emitting area, the second filter part being used for filtering light emitted by the auxiliary light-emitting area, wherein the thickness of the first filter part is smaller than the thickness of the second filter part, and / or the light transmittance of the first filter part is greater than the light transmittance of the second filter part.

Description

Technical Field

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

[0002] Currently, OLED (Organic Light-Emitting Diode) has shown great application potential in the display and lighting fields as a novel light-emitting device, thus attracting strong attention from the industry. In the display field, OLED has advantages over LCD (Liquid Crystal Display) such as self-illumination, fast response, wide viewing angle, high brightness, vibrant colors, and thinness, and is considered the next-generation display technology. Among them, WOLED (White Organic Light-Emitting Diode) has been more widely used than ordinary OLED devices due to its longer lifespan and higher luminous efficiency.

[0003] In related technologies, due to the relatively low light extraction efficiency of OLEDs, the main methods to improve OLED light extraction efficiency are to reduce waveguide effects and decrease total internal reflection. For example, high-fill-in MLAs (microlens arrays) within pixels are used to reduce total internal reflection and improve OLED light extraction efficiency. In WOLEDs, MLAs are typically fabricated by forming curved grooves on a flat layer within the pixel to improve WOLED light extraction efficiency. However, when the light-emitting layer is fabricated on the MLA surface by vapor deposition, the curved surface of each microlens in the MLA leads to uneven film thickness in the light-emitting layer, making it difficult to achieve a balanced and compatible light extraction efficiency and color gamut across different light-emitting regions of the substrate. Summary of the Invention

[0004] This application provides a light-emitting substrate and a display device to improve the light extraction efficiency and color gamut compatibility balance of different light-emitting areas of the light-emitting substrate.

[0005] A first aspect of this application provides a light-emitting substrate, comprising:

[0006] Substrate;

[0007] A driving circuit layer is disposed on one side of the substrate.

[0008] A planarization layer is disposed on the side of the driving circuit layer away from the substrate. The first surface of the planarization layer is provided with a plurality of concave surfaces, and the first surface is the surface away from the substrate.

[0009] A light-emitting layer is disposed on one side of the flat layer, which includes a plurality of concave surfaces. The light-emitting layer includes a main light-emitting area and an auxiliary light-emitting area. The main light-emitting area is located on the sidewall of the concave surface, and the auxiliary light-emitting area is located at the bottom of the concave surface and the junction area of ​​two adjacent concave surfaces.

[0010] A filter layer is disposed between the driving circuit layer and the planarization layer. The filter layer includes a first filter portion and a second filter portion. The first filter portion is used to filter the light emitted by the main light-emitting area, and the second filter portion is used to filter the light emitted by the auxiliary light-emitting area. The thickness of the first filter portion is less than the thickness of the second filter portion; and / or, the transmittance of the first filter portion is greater than the transmittance of the second filter portion.

[0011] In some embodiments, the auxiliary light-emitting area includes a first light-emitting area and a second light-emitting area, the first light-emitting area being located at the bottom of the concave surface, the second light-emitting area being located at the junction of two adjacent concave surfaces, and the second filter portion including a first sub-filter portion and a second sub-filter portion, wherein the orthographic projection of the first light-emitting area on the substrate at least partially overlaps with the orthographic projection of the first sub-filter portion on the substrate, and the orthographic projection of the second light-emitting area on the substrate at least partially overlaps with the orthographic projection of the second sub-filter portion on the substrate.

[0012] In some embodiments, the first light-emitting region includes a first sub-light-emitting region and a second sub-light-emitting region, the second sub-light-emitting region surrounding the first sub-light-emitting region, and the first sub-filtering region includes a first filtering region and a second filtering region and a third filtering region disposed on both sides of the first filtering region, wherein the orthographic projection of the first sub-light-emitting region on the substrate at least partially overlaps with the orthographic projection of the first filtering region on the substrate, and the orthographic projection of the second sub-light-emitting region on the substrate at least partially overlaps with the orthographic projections of the second filtering region and the third filtering region on the substrate.

[0013] In some embodiments, the angle between the bottom of the concave surface where the first sub-light-emitting region is located and the surface of the substrate ranges from 0° to 5°, and the angle between the bottom of the concave surface where the second sub-light-emitting region is located and the surface of the substrate ranges from 5° to 20°.

[0014] In some embodiments, the thickness of the first filter region is greater than the thickness of the second filter region and the thickness of the third filter region, and the thickness of the second filter region is the same as the thickness of the third filter region.

[0015] In some embodiments, the transmittance of the first filter region is less than the transmittance of the second filter region and the transmittance of the third filter region, and the transmittance of the second filter region is equal to the transmittance of the third filter region.

[0016] In some embodiments, the concave surface is an arc surface.

[0017] In some embodiments, the arc angle corresponding to the arc surface is 30°-90°.

[0018] In some embodiments, the angle between the cross-section of the sidewall where the main light-emitting area is located and the surface of the substrate ranges from 20° to 45°, and the angle between the cross-section of the bottom surface where the auxiliary light-emitting area is located and the surface of the substrate ranges from 0° to 20°.

[0019] A second aspect of this application provides a display device, characterized in that it includes the aforementioned light-emitting substrate.

[0020] The light-emitting substrate provided in this application embodiment adjusts the filter layer disposed between the planarization layer and the driving circuit layer accordingly. The filter layer includes a first filter portion and a second filter portion. The first filter portion is used to filter light emitted from the main light-emitting area, and the second filter portion is used to filter light emitted from the auxiliary light-emitting area. Further, based on the optical difference between the main light-emitting area and the auxiliary light-emitting area of ​​the light-emitting layer, the thickness of the first filter portion corresponding to the main light-emitting area is set to be less than the thickness of the second filter portion corresponding to the auxiliary light-emitting area, or the transmittance of the first filter portion corresponding to the main light-emitting area is set to be greater than the transmittance of the second filter portion corresponding to the auxiliary light-emitting area. The transmittance of the second filter corresponding to the auxiliary light-emitting area can be adjusted, or the thickness of the first filter corresponding to the main light-emitting area can be set to be less than the thickness of the second filter corresponding to the auxiliary light-emitting area, while the transmittance of the first filter corresponding to the main light-emitting area can be set to be greater than the transmittance of the second filter corresponding to the auxiliary light-emitting area. By adjusting the thickness and / or transmittance of the first filter and the second filter, the light output efficiency and color gamut of the main light-emitting area and the auxiliary light-emitting area can be adjusted in different areas, thereby overcoming the technical problem that the light output efficiency and color gamut of different light-emitting areas of existing light-emitting substrates are difficult to be compatible and balanced. Attached Figure Description

[0021] Figure 1 A schematic structural diagram of a bottom-emitting light-emitting substrate provided for an embodiment of this application;

[0022] Figure 2 A schematic partial structural diagram of a light-emitting unit disposed on a microlens array substrate, provided for an embodiment of this application;

[0023] Figure 3 A schematic structural diagram of a light-emitting substrate provided in an embodiment of this application;

[0024] Figure 4 A schematic structural diagram of another light-emitting substrate provided in an embodiment of this application;

[0025] Figure 5 This is a schematic structural diagram of another light-emitting substrate provided in the embodiments of this application. Detailed Implementation

[0026] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0027] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0028] like Figure 1As shown, in the fabrication of WOLED, after the driving circuit layer 20 is fabricated on the substrate 10, a planarization layer 30 can be formed on the surface of the driving circuit layer 20 away from the substrate 10. By forming multiple concave structures on the side of the planarization layer 30 away from the substrate 10, a microlens array (MLA) structure can be obtained. Further, a stacked structure 60 of a first electrode layer, a light-emitting layer, and a second electrode layer is sequentially disposed on the side of the planarization layer 30 with the microlens array structure. A color filter layer 70 is also disposed between the planarization layer 30 and the driving circuit layer 20. The color filter layer 70 is used to filter the light emitted by the light-emitting layer. The microlens array structure disposed on the planarization layer 30 can effectively reduce the probability of total internal reflection of the light emitted by the light-emitting layer in the WOLED device, thereby improving the light extraction efficiency of the fabricated WOLED device.

[0029] However, since the stacked structure 60 of the first electrode layer, the light-emitting layer, and the second electrode layer is disposed on the side of the planarization layer 30 with the microlens array structure, the morphology of the stacked structure of the first electrode layer, the light-emitting layer, and the second electrode layer will be affected by the microlens array structure, that is, it will have multiple protruding regions and multiple recessed regions, such as... Figure 2 As shown, within the laminated structure 60, the first electrode layer and the second electrode layer are disposed opposite to each other, and the light-emitting layer is disposed between the first electrode layer and the second electrode layer. Furthermore, the thickness of the light-emitting layer varies at different locations within the recessed region. Figure 2 As shown in d1, d2 and d3, it is clear that the thickness of the light-emitting layer varies significantly at different locations. The light-emitting layer includes a main light-emitting area I and an auxiliary light-emitting area II. The thickness of the main light-emitting area I, located on the sidewall of the recessed area, is less than the thickness of the auxiliary light-emitting area II, located at the bottom of the recessed area. The auxiliary light-emitting area II also includes a portion of the light-emitting layer located in the raised area.

[0030] Understandably, because there is a difference in thickness between the main light-emitting region I and the auxiliary light-emitting region II, there are also significant differences in the light extraction efficiency and color gamut of the main light-emitting region I and the auxiliary light-emitting region II of the light-emitting substrate. Furthermore, the emission spectrum of the auxiliary light-emitting region II is red-shifted compared to the emission spectrum of the main light-emitting region I. In order to control the light extraction efficiency and color gamut of the main light-emitting region I and the auxiliary light-emitting region II, if the light extraction efficiency and color gamut of the auxiliary light-emitting region II are used as the benchmark, the thickness of the color filter layer 70 needs to be increased. However, increasing the thickness of the color filter layer 70 will lead to a decrease in the light extraction efficiency of the main light-emitting region I. If the light extraction efficiency and color gamut of the main light-emitting region I are used as the benchmark, the thickness of the color filter layer 70 needs to be reduced. However, reducing the thickness of the color filter layer 70 will lead to a decrease in the color gamut of the light emitted by the auxiliary light-emitting region II after passing through the color filter layer 70.

[0031] In view of this, such as Figure 3As shown, in a first aspect of this application, a light-emitting substrate is provided, comprising: a substrate 10 and a driving circuit layer 20, a planarization layer 30 and a light-emitting layer 40 sequentially disposed on the substrate 10. The planarization layer 30 is disposed on the side of the driving circuit layer 20 away from the substrate 10, and a first surface 31 of the planarization layer 30 is provided with a plurality of concave surfaces 32. The first surface 31 is the surface away from the substrate 10. The light-emitting layer 40 is disposed on the side of the planarization layer 30 that includes the plurality of concave surfaces 32. The light-emitting layer 40 includes a main light-emitting region 41 and an auxiliary light-emitting region 42. The main light-emitting region 41 is located on the sidewall of the concave surface 32, and the auxiliary light-emitting region 42 is located at the bottom of the concave surface 32 and the junction area of ​​two adjacent concave surfaces 32.

[0032] The light-emitting substrate further includes a filter layer 50, which is disposed between the driving circuit layer 20 and the planarization layer 30. The filter layer 50 includes a first filter portion 51 and a second filter portion 52. The first filter portion 51 is used to filter the light emitted by the main light-emitting area 41, and the second filter portion 52 is used to filter the light emitted by the auxiliary light-emitting area 42. The thickness of the first filter portion 51 is less than the thickness of the second filter portion 52; and / or, the transmittance of the first filter portion 51 is greater than the transmittance of the second filter portion 52.

[0033] In this embodiment, the planarization layer 30 includes a first surface 31 and a second surface 33. The first surface 31 is the surface of the planarization layer 30 away from the substrate 10, and the second surface 33 is the surface of the planarization layer 30 close to the substrate 10. A plurality of concave surfaces 32 are formed on the first surface 31 by being recessed inward along the thickness direction of the planarization layer 30. The plurality of concave surfaces 32 are arranged in an array on the first surface 31 of the planarization layer 30 to form a microlens array structure. The formed microlens array structure can effectively reduce the probability of total internal reflection of the light emitted by the light-emitting layer 40 in the light-emitting substrate, which is beneficial to improving the light emission efficiency of the prepared light-emitting substrate.

[0034] Furthermore, in this embodiment, since the light-emitting layer 40 is disposed on the first surface 31 of the flat layer 30, the formed light-emitting layer 40 has an inward concave structure similar to the concave surface 32. Due to the influence of gravity, the thickness of the light-emitting layer 40 located on the sidewall of the concave surface 32 is less than the thickness of the light-emitting layer 40 located at the bottom of the concave surface 32. At the same time, the thickness of the light-emitting layer 40 located on the sidewall of the concave surface 32 is also less than the thickness of the light-emitting layer located in the junction area of ​​two adjacent concave surfaces 32. The light-emitting layer 40 located on the sidewall of the concave surface 32 is the main light-emitting area 41, and the light-emitting layer 40 located at the bottom of the concave surface 32 and the light-emitting layer 40 located in the junction area of ​​two adjacent concave surfaces 32 are auxiliary light-emitting areas 42.

[0035] In this embodiment, by adjusting the filter layer 50 accordingly, the filter layer 50 includes a first filter portion 51 and a second filter portion 52. The first filter portion 51 is used to filter the light emitted from the main light-emitting area 41, and the second filter portion 52 is used to filter the light emitted from the auxiliary light-emitting area 42. For example... Figure 3 As shown, based on the optical differences between the main light-emitting area 41 and the auxiliary light-emitting area 42 of the light-emitting layer 40, the thickness of the first filter section 51 corresponding to the main light-emitting area 41 is set to be less than the thickness of the second filter section 52 corresponding to the auxiliary light-emitting area 42. By using the first filter section 51 and the second filter section 52 with different thicknesses, the light output efficiency and color gamut of the main light-emitting area 41 and the auxiliary light-emitting area 42 can be adjusted in different zones. This overcomes the technical problem that it is difficult to adjust the light output efficiency and color gamut of the main light-emitting area 41 and the auxiliary light-emitting area 42 simultaneously when using a filter layer of a single thickness.

[0036] Understandably, in this embodiment, when a filter layer 50 of a single thickness is used, if the thickness of the filter layer 50 is set to be relatively thin to accommodate the adjustment of the light extraction efficiency and color gamut of the main light-emitting region 41, the color gamut of the auxiliary light-emitting region 42 will decrease due to the thinner thickness of the filter layer 50. Conversely, if the thickness of the filter layer 50 is set to be relatively thick to accommodate the adjustment of the light extraction efficiency and color gamut of the auxiliary light-emitting region 42, the light extraction efficiency of different colors of light in the main light-emitting region 41 will decrease due to the thicker thickness of the filter layer 50. Therefore, by using filter sections 50 of different thicknesses, the light extraction efficiency and color gamut of the main light-emitting region 41 and the auxiliary light-emitting region 42 can be adjusted separately, overcoming the technical problem that it is difficult to simultaneously adjust the light extraction efficiency and color gamut of the main light-emitting region 41 and the auxiliary light-emitting region 42 when using a filter layer 50 of a single thickness.

[0037] For example, in this embodiment, based on the optical difference between the main light-emitting area 41 and the auxiliary light-emitting area 42 of the light-emitting layer 40, the transmittance of the first filter 51 corresponding to the main light-emitting area 41 can be set to be greater than the transmittance of the second filter 52 corresponding to the auxiliary light-emitting area 42. By using the first filter 51 and the second filter 52 with different transmittances, the light output efficiency and color gamut of the main light-emitting area 41 and the auxiliary light-emitting area 42 can be adjusted in a partitioned manner.

[0038] It should be noted that, in this embodiment, in order to make the first filter portion 51 and the second filter portion 52 within the filter layer 50 have different transmittances, different types of materials can be used to prepare the first filter portion 51 and the second filter portion 52. Understandably, in this embodiment, when the filter layer 50 is prepared using the same material, the first filter portion 51 and the second filter portion 52 have the same transmittance; however, when the filter layer 50 is prepared using different materials, the transmittance in different regions of the filter layer 50 is related to the materials used. If the transmittance of the filter layer 50 is set to be relatively high to accommodate the adjustment of the light extraction efficiency and color gamut of the main light-emitting area 41, the high transmittance of the filter layer 50 will lead to an imbalance in the light extraction efficiency and color gamut of the auxiliary light-emitting area 42. Conversely, if the transmittance of the filter layer 50 is set to be relatively low to accommodate the adjustment of the light extraction efficiency and color gamut of the auxiliary light-emitting area 42, the low transmittance of the filter layer 50 will lead to a decrease in the light extraction efficiency of the main light-emitting area 41. Therefore, by using the first filter section 51 and the second filter section 52 with different transmittances, the light extraction efficiency and color gamut of the main light-emitting area 41 and the auxiliary light-emitting area 42 can be adjusted in separate zones.

[0039] Furthermore, according to the foregoing description, the thickness of the first filter portion 51 corresponding to the main light-emitting area 41 of the light-emitting layer 40 is less than the thickness of the second filter portion 52 corresponding to the auxiliary light-emitting area 42 of the light-emitting layer 40, or the transmittance of the first filter portion 51 corresponding to the main light-emitting area 41 of the light-emitting layer 40 is greater than the transmittance of the second filter portion 52 corresponding to the auxiliary light-emitting area 42 of the light-emitting layer 40, can achieve the zonal adjustment of the light output efficiency and color gamut of the main light-emitting area 41 and the auxiliary light-emitting area 42, thereby overcoming the technical problem in the prior art that it is difficult to adjust the light output efficiency and color gamut of the main light-emitting area 41 and the auxiliary light-emitting area 42 at the same time.

[0040] Therefore, in this embodiment, the thickness of the first filter portion 51 corresponding to the main light-emitting area 41 can be set to be less than the thickness of the second filter portion 52 corresponding to the auxiliary light-emitting area 42. At the same time, the transmittance of the first filter portion 51 corresponding to the main light-emitting area 41 can be set to be greater than the transmittance of the second filter portion 52 corresponding to the auxiliary light-emitting area 42. By simultaneously adjusting the thickness and transmittance of the first filter portion 51 and the second filter portion 52, the light output efficiency and color gamut of the main light-emitting area 41 and the auxiliary light-emitting area 42 can be adjusted in a zonal manner.

[0041] Specifically, in some implementations, such as Figure 4As shown, the auxiliary light-emitting area 42 includes a first light-emitting area 420 and a second light-emitting area 421. The first light-emitting area 420 is located at the bottom of the concave surface 32, and the second light-emitting area 421 is located at the junction of two adjacent concave surfaces 32. The second filter part 52 includes a first sub-filter part 520 and a second sub-filter part 521. The orthographic projection of the first sub-filter part 520 on the substrate 10 at least partially overlaps with the orthographic projection of the first light-emitting area 420 on the substrate 10, and the orthographic projection of the second sub-filter part 521 on the substrate 10 at least partially overlaps with the orthographic projection of the second light-emitting area 421 on the substrate 10.

[0042] In this embodiment, the orthographic projection of the first sub-filter 520 on the substrate 10 at least partially overlaps with the orthographic projection of the first light-emitting region 420 on the substrate 10, so that the first sub-filter 520 can be used to filter the light emitted by the first light-emitting region 420. The orthographic projection of the second sub-filter 521 on the substrate 10 at least partially overlaps with the orthographic projection of the second light-emitting region 421 on the substrate 10, so that the second sub-filter 521 can be used to filter the light emitted by the second light-emitting region 421.

[0043] It should be noted that, in this embodiment, considering that the positions of the first light-emitting area 420 corresponding to the first sub-filter 520 and the second light-emitting area 421 corresponding to the second sub-filter 521 on the planarization layer 30 are not the same, the first light-emitting area 420 is located at the bottom of the concave surface 32, and the second light-emitting area 421 is located at the junction area of ​​two adjacent concave surfaces 32, the thickness of the first sub-filter 520 and the thickness of the second sub-filter 521 can be the same or different. At the same time, the light transmittance of the first sub-filter 520 and the light transmittance of the second sub-filter 521 can be the same or different. In this embodiment, no further detailed limitations are made, and the thickness and light transmittance of the first sub-filter 520 and the second sub-filter 521 can be adjusted according to the actual situation.

[0044] Furthermore, such as Figure 5 As shown, in some embodiments, the first light-emitting region 420 includes a first sub-light-emitting region 4201 and a second sub-light-emitting region 4202, the second sub-light-emitting region 4202 surrounding the first sub-light-emitting region 4201, and the first sub-filtering region 520 includes a first filtering region 5201 and a second filtering region 5202 and a third filtering region 5203 disposed on both sides of the first filtering region 5201. The orthographic projection of the first sub-light-emitting region 4201 on the substrate 10 at least partially overlaps with the orthographic projection of the first filtering region 5201 on the substrate 10, and the orthographic projection of the second sub-light-emitting region 4202 on the substrate 10 at least partially overlaps with the orthographic projections of the second filtering region 5202 and the third filtering region 5203 on the substrate 10.

[0045] In this embodiment, the first filter area 5201 is used to filter the light emitted by the first sub-light-emitting area 4201, and the second filter area 5202 and the third filter area 5203 are used to filter the light emitted by the second sub-light-emitting area 4202. By further subdividing the first light-emitting area 420 disposed on the bottom of the concave surface 32 into the first sub-light-emitting area 4201 and the second sub-light-emitting area 4202, the first sub-filter portion 520 is also further subdivided into the first filter area 5201, the second filter area 5202, and the third filter area 5203. Region 5203, wherein the orthographic projection of the first sub-light-emitting region 4201 on the substrate 10 at least partially overlaps with the orthographic projection of the first filter region 5201 on the substrate 10, and the orthographic projection of the second sub-light-emitting region 4202 on the substrate 10 at least partially overlaps with the orthographic projections of the second filter region 5202 and the third filter region 5203 on the substrate 10, that is, the first filter region 5201 can be used to control the light output efficiency and color gamut of the first sub-light-emitting region 4201, and the second filter region 5202 and the third filter region 5203 can be used to control the light output efficiency and color gamut of the second sub-light-emitting region 4202.

[0046] Specifically, in this embodiment, the transmittance of the first filter region 5201 is less than the transmittance of the second filter region 5202 and the transmittance of the third filter region 5203; or, the thickness of the first filter region 5201 is greater than the thickness of the second filter region 5202 and the thickness of the third filter region 5203; or, the transmittance of the first filter region 5201 is less than the transmittance of the second filter region 5202 and the transmittance of the third filter region 5203, while the thickness of the first filter region 5201 is greater than the thickness of the second filter region 5202 and the thickness of the third filter region 5203.

[0047] In some embodiments, the angle between the bottom of the concave surface 32 where the first sub-light-emitting region 4201 is located and the surface of the substrate 10 is in the range of 0°-5°, and the angle between the bottom of the concave surface 32 where the second sub-light-emitting region 4202 is located and the surface of the substrate 10 is in the range of 5°-20°.

[0048] Understandably, given that the thickness of the first light-emitting area 420 disposed on the bottom of the concave surface 32 is still uneven, in this embodiment, the first light-emitting area 420 disposed on the bottom of the concave surface 32 is further subdivided into a first sub-light-emitting area 4201 and a second sub-light-emitting area 4202. The angle between the cross-section of the bottom of the concave surface 32 where the first sub-light-emitting area 4201 is located and the surface of the substrate 10 is in the range of 0°-5°, and the angle between the cross-section of the bottom of the concave surface 32 where the second sub-light-emitting area 4202 is located and the surface of the substrate 10 is in the range of 5°-20°. By subdividing the first light-emitting area 420 disposed on the bottom of the concave surface 32 and its corresponding filter area, it is beneficial to accurately control the light output efficiency and color gamut of the first light-emitting area 420 disposed on the bottom of the concave surface 32.

[0049] In some implementations, the concave surface 320 is an arc surface.

[0050] In some implementations, the radian angle corresponding to the curved surface is 30°-90°.

[0051] In this embodiment, the degree of concavity of the curved surface affects the structure of the light-emitting layer 40 disposed on the planarization layer 30. Specifically, when the degree of concavity of the curved surface along the thickness direction of the planarization layer 30 is large, the tilt angle of the sidewall of the curved surface relative to the surface of the substrate 10 is larger. This causes the thickness of the main light-emitting region 41 located on the sidewall of the curved surface to become thinner as the degree of concavity of the curved surface increases. At the same time, at the bottom of the curved surface, the light-emitting layer material accumulates due to gravity, causing the thickness of the auxiliary light-emitting region 42 located at the bottom of the curved surface to increase as the degree of concavity of the curved surface increases. Therefore, the degree of concavity of the curved surface leads to a more pronounced optical difference between the main light-emitting region 41 and the auxiliary light-emitting region 42.

[0052] In related technologies, to reduce the optical difference between the main light-emitting region 41 and the auxiliary light-emitting region 42 of the light-emitting layer 40, the arc slope of the microlens array is usually reduced and the inner diameter is increased to reduce the thickness difference between the main light-emitting region 41 and the auxiliary light-emitting region 42, thereby reducing the optical difference between the main light-emitting region 41 and the auxiliary light-emitting region 42 of the light-emitting layer 40. In this embodiment, when the arc angle corresponding to the inward concavity of the arc surface formed along the thickness direction of the planarization layer 30 is 30°-90°, the optical difference between the main light-emitting region 41 and the auxiliary light-emitting region 42 of the light-emitting layer 40 can be reduced while maintaining a high level of improvement in light extraction efficiency by the microlens array formed on the planarization layer 30. Preferably, the arc angle corresponding to the arc surface is 30°-60°.

[0053] In some embodiments, the angle between the cross-section of the sidewall where the main light-emitting region 41 is located and the surface of the substrate 10 is in the range of 20°-45°, and the angle between the cross-section of the bottom where the auxiliary light-emitting region 42 is located and the surface of the substrate 10 is in the range of 0°-20°.

[0054] In this embodiment, the main light-emitting area 41 is a light-emitting layer disposed on the side wall of the arc surface, and the auxiliary light-emitting area 42 includes a light-emitting layer disposed on the bottom surface of the arc surface and a light-emitting layer disposed in the junction area of ​​two adjacent arc surfaces. The angle range of the side wall of the arc surface where the main light-emitting area 41 is located relative to the horizontal surface is 20°-45°, and the angle range of the bottom surface of the arc surface where the auxiliary light-emitting area 42 is located relative to the horizontal surface is 0°-45°.

[0055] In some embodiments, the light-emitting substrate further includes a first electrode layer and a second electrode layer, wherein the first electrode layer is disposed on the side of the light-emitting layer 40 close to the planarization layer 30, and the second electrode layer is disposed on the other side of the light-emitting layer 40 away from the planarization layer 30. The first electrode layer is an anode layer, the second electrode layer is a cathode layer, and the light-emitting layer is disposed between the first electrode layer and the second electrode layer.

[0056] A second aspect of this application provides a display device, comprising: a light-emitting substrate as described in the first aspect.

[0057] It should be noted that the display device provided in this application embodiment can be any product or component with display function, such as electronic paper, electronic watch, mobile phone, tablet computer, television, monitor, laptop computer, wearable electronic device, digital photo frame, navigator, etc., and this application embodiment does not make any specific limitation.

[0058] The light-emitting substrate provided in this application embodiment adjusts the filter layer disposed between the planarization layer and the driving circuit layer accordingly. The filter layer includes a first filter portion and a second filter portion. The first filter portion is used to filter the light emitted by the main light-emitting area, and the second filter portion is used to filter the light emitted by the auxiliary light-emitting area. Furthermore, based on the optical differences between the main light-emitting area and the auxiliary light-emitting area of ​​the light-emitting layer, the thickness of the first filter portion corresponding to the main light-emitting area is set to be less than the thickness of the second filter portion corresponding to the auxiliary light-emitting area, or the transmittance of the first filter portion corresponding to the main light-emitting area is set to be greater than that of the auxiliary light-emitting area. The transmittance of the second filter corresponding to the light-emitting area, or the thickness of the first filter corresponding to the main light-emitting area is set to be less than the thickness of the second filter corresponding to the auxiliary light-emitting area, and the transmittance of the first filter corresponding to the main light-emitting area is set to be greater than the transmittance of the second filter corresponding to the auxiliary light-emitting area, by adjusting the thickness and / or transmittance of the first filter and the second filter, the light output efficiency and color gamut of the main light-emitting area and the auxiliary light-emitting area can be adjusted in different areas, thereby overcoming the technical problem that the light output efficiency and color gamut of different light-emitting areas of the existing light-emitting substrate are difficult to be compatible and balanced.

[0059] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0060] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0061] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A light-emitting substrate, characterized in that, include: Substrate; A driving circuit layer is disposed on one side of the substrate. A planarization layer is disposed on the side of the driving circuit layer away from the substrate. The first surface of the planarization layer is provided with a plurality of concave surfaces, and the first surface is the surface away from the substrate. A light-emitting layer is disposed on one side of the flat layer, which includes a plurality of concave surfaces. The light-emitting layer includes a main light-emitting area and an auxiliary light-emitting area. The main light-emitting area is located on the sidewall of the concave surface, and the auxiliary light-emitting area is located at the bottom of the concave surface and the junction area of ​​two adjacent concave surfaces. A filter layer is disposed between the driving circuit layer and the planarization layer. The filter layer includes a first filter portion and a second filter portion. The first filter portion is used to filter the light emitted by the main light-emitting area, and the second filter portion is used to filter the light emitted by the auxiliary light-emitting area. The thickness of the first filter portion is less than the thickness of the second filter portion; and / or, the transmittance of the first filter portion is greater than the transmittance of the second filter portion.

2. The light-emitting substrate according to claim 1, characterized in that, The auxiliary light-emitting area includes a first light-emitting area and a second light-emitting area. The first light-emitting area is located at the bottom of the concave surface, and the second light-emitting area is located at the junction of two adjacent concave surfaces. The second filter includes a first sub-filter and a second sub-filter. The orthographic projection of the first light-emitting area on the substrate and the orthographic projection of the first sub-filter on the substrate overlap at least partially, and the orthographic projection of the second light-emitting area on the substrate and the orthographic projection of the second sub-filter on the substrate overlap at least partially.

3. The light-emitting substrate according to claim 2, characterized in that, The first light-emitting area includes a first sub-light-emitting area and a second sub-light-emitting area, the second sub-light-emitting area surrounding the first sub-light-emitting area. The first sub-filtering area includes a first filter area and a second filter area and a third filter area disposed on both sides of the first filter area. The orthographic projection of the first sub-light-emitting area on the substrate at least partially overlaps with the orthographic projection of the first filter area on the substrate. The orthographic projection of the second sub-light-emitting area on the substrate at least partially overlaps with the orthographic projections of the second filter area and the third filter area on the substrate.

4. The light-emitting substrate according to claim 3, characterized in that, The angle between the bottom of the concave surface where the first sub-light-emitting area is located and the surface of the substrate ranges from 0° to 5°, and the angle between the bottom of the concave surface where the second sub-light-emitting area is located and the surface of the substrate ranges from 5° to 20°.

5. The light-emitting substrate according to claim 3, characterized in that, The thickness of the first filter area is greater than the thickness of the second filter area and the thickness of the third filter area, and the thickness of the second filter area is the same as the thickness of the third filter area.

6. The light-emitting substrate according to claim 3, characterized in that, The transmittance of the first filter region is less than the transmittance of the second filter region and the transmittance of the third filter region, and the transmittance of the second filter region is equal to the transmittance of the third filter region.

7. The light-emitting substrate according to claim 1, characterized in that, The concave surface is an arc surface.

8. The light-emitting substrate according to claim 7, characterized in that, The arc angle corresponding to the arc surface is 30°-90°.

9. The light-emitting substrate according to claim 8, characterized in that, The angle between the cross-section of the sidewall where the main light-emitting area is located and the surface of the substrate ranges from 20° to 45°, and the angle between the cross-section of the bottom surface where the auxiliary light-emitting area is located and the surface of the substrate ranges from 0° to 20°.

10. A display device, characterized in that, Includes the light-emitting substrate as described in any one of claims 1-9.

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