CN115548229A - Display panel and display device - Google Patents

Abstract

The present disclosure provides a display panel and a display device, including a substrate; a plurality of light emitting devices having different light emitting areas, the light emitting devices being located on the substrate; the first refractive index layer comprises a plurality of opening regions corresponding to the light-emitting devices and a separator for enclosing and forming the opening regions, and the projection of the opening regions on the substrate is at least partially overlapped with the projection of the light-emitting devices on the substrate; the first gradient angle of the separator corresponding to at least part of the opening area is smaller than the second gradient angle of the separator corresponding to other opening areas, and/or the height of the separator corresponding to at least part of the opening area is larger than that of the separator corresponding to other opening areas; the first refractive index layer is used for reflecting light emitted by the light-emitting device on the side wall of the opening region; the second refractive index layer is located on one side, away from the substrate, of the first refractive index layer, the whole face of the second refractive index layer is arranged and filled in each opening area, and the refractive index of the second refractive index layer is larger than that of the first refractive index layer.

Description

Display panel and display device

Technical Field

The present disclosure relates to display technologies, and in particular, to a display panel and a display device.

Background

Organic electroluminescent Display (OLED) panels have advantages of self-luminescence, fast response, wide viewing angle, high brightness, bright color, lightness and thinness, and are one of the hot spots in the research field of displays at present, and are considered as next generation Display technologies.

Disclosure of Invention

The embodiment of the disclosure provides a display panel and a display device, which are used for improving the light extraction efficiency of a blue sub-pixel.

Accordingly, an embodiment of the present disclosure provides a display panel, including:

a substrate;

a plurality of light emitting devices having different light emitting areas, the light emitting devices being located on the substrate;

a first refractive index layer including a plurality of opening regions corresponding to the plurality of light emitting devices and a spacer enclosing the opening regions, a projection of the opening regions on the substrate at least partially overlapping a projection of the light emitting devices on the substrate; the first gradient angle of the separator corresponding to at least part of the opening area is smaller than the second gradient angle of the separator corresponding to other opening areas, and/or the height of the separator corresponding to at least part of the opening area is larger than that of the separator corresponding to other opening areas; the first refractive index layer is used for reflecting light emitted by the light-emitting device on the side wall of the opening region;

the second refractive index layer is located on one side, away from the substrate, of the first refractive index layer, the whole face of the second refractive index layer is arranged and filled in each opening area, and the refractive index of the second refractive index layer is larger than that of the first refractive index layer.

Optionally, in the display panel provided by the embodiment of the disclosure, in a direction parallel to the substrate surface, a first slope angle corresponding to the light emitting device with the largest light emitting area is smaller than a second slope angle corresponding to the light emitting device with other light emitting areas, and/or a height of a spacer corresponding to the light emitting device with the largest light emitting area is larger than a height of a spacer corresponding to the light emitting device with other light emitting areas.

Optionally, in the above display panel provided in this disclosure, the substrate includes a plurality of first sub-pixel regions, second sub-pixel regions, and third sub-pixel regions of different colors, and the plurality of light emitting devices with different light emitting areas includes a first area light emitting device, a second area light emitting device, and a third area light emitting device, the first area light emitting device corresponds to the first sub-pixel region, the second area light emitting device corresponds to the second sub-pixel region, and the third area light emitting device corresponds to the third sub-pixel region; wherein the content of the first and second substances,

the light emitting efficiency of the third sub-pixel region is lower than the light emitting efficiency of the first sub-pixel region and lower than the light emitting efficiency of the second sub-pixel region, a first slope angle corresponding to an opening region corresponding to the third sub-pixel region is smaller than a second slope angle corresponding to the opening region corresponding to the first sub-pixel region and the second sub-pixel region, and/or the height of a spacer corresponding to the opening region corresponding to the third sub-pixel region is larger than the height of a spacer corresponding to the opening region corresponding to the first sub-pixel region and the second sub-pixel region.

Optionally, in the display panel provided in this disclosure, the first slope angle is 40 ° to 50 °, and the second slope angle is 60 ° to 70 °.

Optionally, in the display panel provided by the embodiment of the present disclosure, the height of the spacer corresponding to at least a part of the opening region is 2um to 8um, and the height of the spacer corresponding to another opening region is 1um to 4um.

Optionally, in the display panel provided by the embodiment of the present disclosure, when the height of the partition corresponding to at least a part of the opening area is greater than the height of the partitions corresponding to other opening areas, the partition corresponding to the at least part of the opening area is independently disposed from the adjacent partition corresponding to the other opening area.

Optionally, in the display panel provided in the embodiment of the present disclosure, a cross-sectional shape of the opening region is approximately an inverted trapezoid along a thickness direction of the substrate.

Optionally, in the display panel provided by the embodiment of the present disclosure, an encapsulation layer is further included on a side of the second refractive index layer facing away from the substrate, a material of the first refractive index layer includes polyimide, and a material of the second refractive index layer includes SiNx.

Optionally, in the display panel provided in the embodiment of the present disclosure, an encapsulation layer located between the light emitting device and the first refractive index layer is further included.

Optionally, in the display panel provided in the embodiment of the present disclosure, the display panel further includes: the touch structure is positioned between the packaging layer and the second refractive index layer, and the flat layer is positioned between the touch structure and the second refractive index layer; the flat layer is multiplexed into the first refractive index layer.

Optionally, in the display panel provided in the embodiment of the present disclosure, the touch structure includes a first touch electrode layer, a touch insulating layer, and a second touch electrode layer, which are stacked, where the first touch electrode layer is close to the substrate, and the first refractive index layer is disposed on a side of the second touch electrode layer, which is far from the substrate.

Optionally, in the display panel provided in the embodiment of the present disclosure, the first touch electrode layer and the second touch electrode layer include a plurality of metal grids, each metal grid includes a plurality of metal wires, the plurality of metal wires define meshes of the metal grid in a staggered manner, an orthographic projection of each metal wire on the substrate is located between adjacent light emitting devices, and the first refractive index layer covers the metal wires.

Optionally, in the display panel provided by the embodiment of the present disclosure, the material of the first refractive index layer includes a resin, and the material of the second refractive index layer includes a resin mixed with acrylic particles or an acrylic material.

Optionally, in the above display panel provided by the embodiment of the present disclosure, the light emitting device includes a red light emitting device, a green light emitting device and a blue light emitting device, and the light emitting device with the largest light emitting area is the blue light emitting device.

Optionally, in the display panel provided by the embodiment of the present disclosure, an orthographic projection area of the opening region on the substrate is greater than or equal to an orthographic projection area of an effective light emitting region of the light emitting device on the substrate.

Correspondingly, the embodiment of the disclosure also provides a display device, which comprises the display panel.

Drawings

Fig. 1 is a schematic structural diagram of a display panel provided in the related art;

fig. 2 is a schematic structural diagram of another display panel provided in the related art;

fig. 3 is a schematic structural diagram of another display panel provided in the related art;

fig. 4-12 are schematic structural diagrams of a display panel according to an embodiment of the disclosure;

fig. 13 is a schematic top view illustrating a display panel according to an embodiment of the disclosure;

fig. 14 is a schematic top view of a display panel according to an embodiment of the disclosure;

fig. 15 is a schematic view of the light emitting device 23 in fig. 3 emitting light;

fig. 16 is a schematic view of the light emitting device 23 in fig. 5 emitting light;

fig. 17 is a schematic view of the light emitting device 23 in fig. 7 emitting light;

fig. 18 is a schematic view of the light emitting device 23 in fig. 9 emitting light;

FIGS. 19A-19B are schematic diagrams illustrating the display panel of FIG. 5 after each step is performed;

FIGS. 20A-20B are schematic diagrams illustrating the fabrication of the display panel of FIG. 7 after each step;

fig. 21A to 21D are schematic diagrams illustrating the display panel shown in fig. 7 after each step is performed.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, the present disclosure will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The shapes and sizes of the various elements in the drawings are not to scale and are merely illustrative of the present disclosure.

In the conventional OLED, as shown in fig. 1, since the light emitted from the light emitting device 10 finally enters air (low refractive index) from the glass cover plate 20 (high refractive index), when the incident angle of the light at the interface of the glass cover plate 10 reaches or exceeds the critical angle of total reflection, total internal reflection occurs, and most of the emitted light is consumed by total reflection and scattering in the device, resulting in low overall light extraction efficiency.

In order to improve the light extraction efficiency of the OLED, as shown in fig. 2, a Micro prism (Micro lens) 40 may be fabricated outside the encapsulation layer 30, that is, the Micro prism 40 with a low refractive index + the flat layer 50 with a high refractive index are used, and the total reflection principle is utilized to adjust the incident angle when the light reaches the interface of the glass cover plate 20, so as to reduce the total internal reflection of the light in the oblique viewing angle direction and improve the light extraction efficiency.

The traditional RGB pixel arrangement mode can not meet the requirement of a high-resolution product, in order to enable the luminous area of the sub-pixels to be larger on the premise of a considerable display effect, the GGRB pixel arrangement mode is adopted at present, and the screen burning problem can be effectively improved by the GGRB pixel arrangement mode.

However, in the GGRB pixel arrangement, as shown in fig. 3, since the area of the B pixel is large, many light rays emitted by the B pixel do not reach the critical angle of total reflection when reaching the interface of the micro prism 40, and thus cannot be emitted from the surface of the glass cover plate finally, so that the luminance gain of blue light is much lower than that of red light and green light.

Based on this, in order to solve the problem that the luminance gain of blue light is much lower than that of red and green light, the embodiments of the present disclosure provide a display panel, as shown in fig. 4 to 9, including:

a substrate 1;

a plurality of light emitting devices (21, 22, 23) having different light emitting areas, the light emitting devices (21, 22, 23) being located on the substrate 1;

a first refractive index layer 3 including a plurality of opening regions (31, 32, 33) corresponding to the plurality of light emitting devices (21, 22, 23) and a partition 34 enclosing the opening regions (31, 32, 33), a projection of the opening regions (e.g., 31) on the substrate 1 at least partially overlapping a projection of the light emitting devices 21 on the substrate 1; wherein the first slope angle θ 1 of the partition bodies 34 corresponding to at least a part of the opening area (e.g., 33) is smaller than the second slope angle θ 2 of the partition bodies 34 corresponding to the other opening areas (e.g., 31 and 32), and/or the height h1 of the partition bodies 34 corresponding to at least a part of the opening area (e.g., 33) is larger than the heights (h 2 and h 3) of the partition bodies 34 corresponding to the other opening areas (e.g., 31 and 32); specifically, as shown in fig. 4 and 5, a first slope angle θ 1 of the partition body 34 corresponding to at least a part of the opening area (e.g., 33) is smaller than a second slope angle θ 2 of the partition body 34 corresponding to the other opening areas (e.g., 31 and 32); as shown in fig. 6 and 7, the height h1 of the partition 34 corresponding to at least a part of the opening area (e.g., 33) is greater than the heights (h 2 and h 3) of the partitions 34 corresponding to the other opening areas (e.g., 31 and 32); as shown in fig. 8 and 9, the first slope angle θ 1 of the partition body 34 corresponding to at least a part of the opening area (e.g., 33) is smaller than the second slope angle θ 2 of the partition body 34 corresponding to the other opening area (e.g., 31 and 32), and the height h1 of the partition body 34 corresponding to at least a part of the opening area (e.g., 33) is larger than the heights (h 2 and h 3) of the partition body 34 corresponding to the other opening area (e.g., 31 and 32); the first refractive index layer 3 is for reflecting light emitted from the light emitting devices (21, 22, 23) at the sidewall 331 of the opening region (e.g., 33);

and a second refractive index layer 4 located on a side of the first refractive index layer 3 away from the substrate 1, wherein the second refractive index layer 4 is disposed over the entire surface and fills each opening region (31, 32, 33), and the refractive index of the second refractive index layer 4 is greater than the refractive index of the first refractive index layer 3.

In the display panel provided by the embodiment of the disclosure, since the second refractive index layer 4 with a high refractive index covers the opening regions (31, 32, 33), and the first refractive index layer 3 is a low refractive index layer, the sidewall 331 of the opening region (e.g., 33) is an interface where light emitted by the light emitting device 23 is totally reflected, the first slope angle θ 1 of the partition body 34 corresponding to at least part of the opening region (e.g., 33) is smaller than the second slope angle θ 2 of the partition body 34 corresponding to other opening regions (e.g., 31 and 32), so that light emitted by the light emitting device 23 corresponding to the opening region 33 can still be totally reflected at the sidewall 331 to improve the light extraction gain of the light emitting device 23 corresponding to the opening region 33; and/or the height h1 of the spacers 34 corresponding to at least a part of the opening regions (e.g. 33) is greater than the heights (h 2 and h 3) of the spacers 34 corresponding to other opening regions (e.g. 31 and 32), so that the light emitted from the light emitting device 23 corresponding to the opening region 33 can be more totally reflected on the sidewall 331 and emitted from the interface of the second refractive index layer 4, and the light extraction gain of the light emitting device 23 corresponding to the opening region 33 is improved.

In practical implementation, in the display panel provided in the embodiment of the present disclosure, as shown in fig. 4, fig. 6 and fig. 8, an encapsulation layer 5 is further included on a side of the second refractive index layer 4 facing away from the substrate 1, that is, the first refractive index layer 3 and the second refractive index layer 4 provided in the embodiment of the present disclosure are fabricated before the display panel is encapsulated; the light emitting device (21, 22, 23) includes an anode, a light emitting layer, and a cathode (not shown) sequentially stacked on the substrate 1 with the first refractive index layer 3 between the cathode and the second refractive index layer 4; among them, the material of the first refractive index layer 3 may include polyimide, and the material of the second refractive index layer 4 may include SiNx. Specifically, when the display panel is manufactured, a Pixel Defining Layer (PDL) needs to be manufactured to define a pixel opening region, the light emitting device is manufactured in the corresponding pixel opening region, and the material of the PDL is generally polyimide, so the first refractive index layer 3 in the embodiment of the present disclosure may be manufactured by adopting a PDL material; specifically, the refractive index of polyimide is 1.65 and the refractive index of sinx is 1.94.

It should be noted that fig. 4, fig. 6, and fig. 8 in the embodiments of the present disclosure are described by taking the material of the first refractive index layer 3 as PDL material (polyimide) and the material of the second refractive index layer 4 includes SiNx as an example, so that the manufacturing can be facilitated. Of course, in specific implementation, other different materials may be used for the first refractive index layer 3 and the second refractive index layer 4, as long as the refractive index of the second refractive index layer 4 is larger than that of the first refractive index layer 3.

In practical implementation, in the above display panel provided in the embodiment of the present disclosure, as shown in fig. 5, fig. 7 and fig. 9, an encapsulation layer 5 located between the light emitting device (21, 22, 23) and the first refractive index layer 3 is further included, that is, the first refractive index layer 3 and the second refractive index layer 4 provided in the embodiment of the present disclosure are fabricated after the display panel is encapsulated.

In specific implementation, as shown in fig. 10 to 12, the display panel provided in the embodiment of the present disclosure further includes: a touch structure 6 between the encapsulation layer 5 and the second refractive index layer 4, and a flat layer 7 between the touch structure 6 and the second refractive index layer 4; the flat layer 7 is multiplexed into the first refractive index layer 3, so that the first refractive index layer 3 does not need to be separately manufactured on the flat layer 7, and the manufacturing of a film layer can be saved. Specifically, the flat layer 7 is used for flattening the surface of the touch structure 6 for performing the subsequent manufacturing process, although the flat layer 7 is reused as the first refractive index layer 3, and the first refractive index layer 3 has an opening region, the second refractive index layer 4 is disposed over the entire surface and covers the opening region, so that what actually plays a role in flattening is the second refractive index layer 4, and thus the embodiment of the disclosure does not affect the flatness of the subsequent film layer.

In practical implementation, in the display panel provided in the embodiment of the present disclosure, as shown in fig. 10 to 12, the touch structure 6 includes a first touch electrode layer 61, a touch insulating layer 62, and a second touch electrode layer 63, which are stacked, the first touch electrode layer 61 is close to the substrate 1, and the first refractive index layer 3 is disposed on a side of the second touch electrode layer 63 away from the substrate 1. Specifically, one of the first touch electrode layer 61 and the second touch electrode layer 63 is a driving electrode, and the other is a sensing electrode.

In specific implementation, as shown in fig. 13, in the above display panel provided in the embodiment of the present disclosure, as shown in fig. 13, fig. 13 is a schematic top view of a portion of the film layer in fig. 10-12, the first touch electrode layer 61 and the second touch electrode layer 63 include a plurality of metal grids, each metal grid includes a plurality of metal wires 601, the plurality of metal wires 601 are staggered to define meshes 602 of the metal grid, a forward projection of each metal wire 601 on the substrate 1 is located between adjacent light emitting devices, and the first refractive index layer 3 covers the metal wires 601.

In specific implementation, in the display panel provided in the embodiment of the present disclosure, as shown in fig. 5, 7, 9, and 10 to 12, the material of the first refractive index layer 3 may include a resin (material of a flat layer), and the material of the second refractive index layer 4 may include a resin mixed with acrylic particles or an acrylic material. Specifically, the refractive index of the resin mixed with the acryl fine particles is greater than that of the resin material alone, and the refractive index of the acryl material is greater than that of the resin. Specifically, the refractive index of the resin was 1.51, and the refractive index of the resin mixed with the acryl fine particles was 1.71.

In practical implementation, to make the light emitted by the light emitting device totally reflect at the interface of the first refractive index layer as much as possible, in the display panel provided in the embodiment of the present disclosure, as shown in fig. 4 to 12, an area of an orthographic projection of the opening region (e.g., 33) on the substrate 1 is greater than or equal to an area of an orthographic projection of the effective light emitting region of the light emitting device 23 on the substrate 1.

In specific implementation, in order to make the sub-pixel light-emitting area ratio larger on the premise of a comparable display effect, as shown in fig. 14, the embodiment of the present disclosure employs a GGRB pixel arrangement manner, where 21 represents an R sub-pixel, 22 represents a G sub-pixel, and 23 represents a B sub-pixel, and the GGRB pixel arrangement manner can effectively improve the burn-in problem, so that in the display panel provided in the embodiment of the present disclosure, as shown in fig. 4 to 12, the light-emitting devices (21, 22, 23) may include a red light-emitting device 21, a green light-emitting device 22, and a blue light-emitting device 23, and the light-emitting device 23 with the largest light-emitting area is a blue light-emitting device.

In specific implementation, in order to increase the light extraction angle of the light emitting device, in the display panel provided in the embodiment of the present disclosure, as shown in fig. 4 to 12, the cross-sectional shape of the opening region (31, 32, 33) is approximately inverted trapezoid along the thickness direction of the substrate 1.

In specific implementation, as shown in fig. 5, 7 and 9, since the light emitting area of the blue light emitting device 23 is large, the refractive index n1 of the first refractive index layer 3 (resin) is 1.71, and the refractive index n2 of the second refractive index layer 4 (resin mixed with acryl particles) is 1.71. As shown in fig. 15, fig. 15 is a schematic cross-sectional view of the B pixel shown in fig. 3 in the prior art, where the refractive index of air n0=1.0, the critical angle of total reflection of the light emitted from the light emitting device 23 (e.g., the light L in the central region of the B pixel) at the side 331 is arcsin n1/n2=62 °, and when the light enters the air from the second refractive index layer 4, the critical angle of total reflection is arcsin n 0/n 2=35.8 °, as can be seen from fig. 15, when the slope angle of the B pixel microprism 40 is large, a part of the light reaches the microprism 40 and does not reach the critical angle of total reflection (arcsin n1/n2=62 °), and reaches the interface between the high refractive index flat layer 50 and the air after being refracted, the total internal reflection occurs again, and the light extraction efficiency is reduced. Therefore, in the display panel provided by the embodiment of the present disclosure, as shown in fig. 16, in a direction parallel to the surface of the substrate 1, a first slope angle θ 1 corresponding to the light emitting device 23 with the largest light emitting area is smaller than a second slope angle θ 2 corresponding to the light emitting devices (21 and 22) with other light emitting areas, and after the first slope angle θ 1 corresponding to the first refractive index layer 3 corresponding to the light emitting device 23, more light rays emitted by the light emitting device 23 are totally reflected when reaching the prism surface and are emitted from the interface of the second refractive index layer 4, so that the light extraction gain of the light emitting device 23 is improved. As shown in fig. 17, the height h1 of the partition body 34 corresponding to the light emitting device 23 with the largest light emitting area is greater than the height h2 of the partition bodies corresponding to the light emitting devices (21 and 22) with other light emitting areas, and since the thickness of the partition body 34 corresponding to the light emitting device 23 is greater, the light emitted by the light emitting device 23 corresponding to the opening area 33 can be more totally reflected on the sidewall 331 and emitted from the interface of the second refractive index layer 4, thereby increasing the light output gain of the light emitting device 23 corresponding to the opening area 33; as shown in fig. 18, in the direction parallel to the surface of the substrate 1, the first slope angle θ 1 corresponding to the light emitting device 23 having the largest light emitting area is smaller than the second slope angle θ 2 corresponding to the light emitting devices (21 and 22) having other light emitting areas, and the height h1 of the spacer 34 corresponding to the light emitting device 23 having the largest light emitting area is larger than the height h2 of the spacer corresponding to the light emitting devices (21 and 22) having other light emitting areas, so that the light extraction gain of the light emitting device 23 corresponding to the opening area 33 can be further improved.

In specific implementation, in the above display panel provided in the embodiment of the present disclosure, as shown in fig. 4 and 5, the substrate 1 includes a plurality of first sub-pixel regions R, second sub-pixel regions G, and third sub-pixel regions B of different colors, the plurality of light emitting devices (21, 22, 23) having different light emitting areas include a first area light emitting device 21, a second area light emitting device 22, and a third area light emitting device 23, the first area light emitting device 21 corresponds to the first sub-pixel region R, the second area light emitting device 22 corresponds to the second sub-pixel region G, and the third area light emitting device 23 corresponds to the third sub-pixel region B; wherein, the first and the second end of the pipe are connected with each other,

the light emitting efficiency of the third sub-pixel region B is lower than the light emitting efficiency of the first sub-pixel region R and lower than the light emitting efficiency of the second sub-pixel region G, the first slope angle θ 1 corresponding to the opening region 33 corresponding to the third sub-pixel region B is smaller than the second slope angle θ 2 corresponding to the opening regions (21, 22) corresponding to the first sub-pixel region R and the second sub-pixel region G, and/or the height h1 of the spacer 34 corresponding to the opening region 23 corresponding to the third sub-pixel region B is larger than the height of the spacer 34 corresponding to the opening regions (21, 22) corresponding to the first sub-pixel region R and the second sub-pixel region G. Therefore, more light rays emitted by the light emitting device 23 corresponding to the third sub-pixel region B can be totally reflected on the sidewall 331 and emitted from the interface of the second refractive index layer 4, and the light extraction gain of the light emitting device 23 corresponding to the third sub-pixel region B is improved.

In a specific implementation, in the display panel provided in the embodiment of the present disclosure, as shown in fig. 4, 5, 8, and 9, the first slope angle is 40 ° to 50 °, and the second slope angle is 60 ° to 70 °.

In specific implementation, in the display panel provided in the embodiment of the present disclosure, as shown in fig. 6, 7, 8 and 9, the height h1 of the partition body 34 corresponding to at least a part of the opening region (23) is 2um to 8um, preferably 4um, and the height h2 of the partition body 34 corresponding to the other opening regions (21, 22) is 1um to 4um, preferably 2um.

In specific implementation, in the display panel provided in the embodiment of the present disclosure, as shown in fig. 6, 7, 8 and 9, when the height h1 of the partition 34 corresponding to at least a part of the opening region (23) is greater than the height h2 of the partition 34 corresponding to the other opening region (21, 22), the partition 34 corresponding to at least a part of the opening region (23) is independently disposed from the partition 34 corresponding to the adjacent other opening region (e.g., 23).

The following describes a method for manufacturing the first refractive index layer 3 and the second refractive index layer 4 according to the embodiment of the present disclosure, by taking the display panel shown in fig. 5 and 7 as an example:

the steps for preparing the display panel shown in fig. 5 are as follows:

(1) The method includes the steps of sequentially preparing a plurality of light-emitting devices (21, 22 and 23) with different light-emitting areas on a substrate 1, manufacturing an encapsulation layer 5 on one side, away from the substrate 1, of each of the light-emitting devices (21, 22 and 23) to encapsulate the light-emitting devices (21, 22 and 23), then coating a resin material (taking a positive resin material as an example) on one side, away from the substrate 1, of the encapsulation layer 5 to form a first refractive index film layer 3', and then exposing the first refractive index film layer 3' by using a half-tone mask (HTM mask), wherein the masks at positions corresponding to the light-emitting devices 21, 22 and 23 are set to be high in transmittance, and edges of high-transmittance regions of the masks at positions corresponding to the light-emitting devices 23 are set to be low in transmittance, as shown in fig. 19A.

(2) And performing a developing process on the exposed first refractive index film layer 3', controlling the second slope angle θ 2 corresponding to the light emitting devices 21 and 22 to be 60-70 degrees, and the first slope angle θ 1 corresponding to the light emitting device 23 to be 40-50 degrees, to form the first refractive index layer 3, as shown in fig. 19B.

(3) A second refractive index layer 4 is formed on the side of the first refractive index layer 3 facing away from the substrate 1, as shown in fig. 5.

The steps for preparing the display panel shown in fig. 7 are as follows:

(1) The method includes the steps of sequentially preparing a plurality of light emitting devices (21, 22, 23) with different light emitting areas on a substrate 1, manufacturing an encapsulation layer 5 on one side, away from the substrate 1, of each light emitting device (21, 22, 23) to encapsulate the light emitting device (21, 22, 23), coating a resin material (taking a negative resin material as an example) on one side, away from the substrate 1, of the encapsulation layer 5 to form a first refractive index film 3', wherein the first refractive index film 3' is thicker than 2 times of the first refractive index film 3 'in the display panel shown in fig. 5, and exposing the first refractive index film 3' by using a half-tone mask (HTM mask), wherein the light emitting device 21, the light emitting device 22 and the light emitting device 23 are opaque to a mask at a corresponding position, the mask at a corresponding position between the light emitting device 21 and the light emitting device 22 is set to be low in transmittance, the edge of an area at a corresponding position of the light emitting device 23 is set to be high in transmittance, and the light emitting device 22 and the light emitting device 23 are set to be low transmittance, non-transmissive and high transmittance in sequence, as shown in fig. 20A.

(2) The exposed first refractive index film layer 3' is subjected to a developing process, and the thickness h2 of the spacers 34 corresponding to the light emitting devices 21 and 22 is controlled to be 2um, and the thickness h1 of the spacers 34 corresponding to the light emitting devices 23 is controlled to be 4um, so that the first refractive index layer 3 is formed, as shown in fig. 20B.

(3) A second refractive index layer 4 is formed on the side of the first refractive index layer 3 facing away from the substrate 1, as shown in fig. 7.

The steps for preparing the display panel shown in fig. 7 may also be as follows:

(1) A plurality of light emitting devices (21, 22, 23) with different light emitting areas are sequentially prepared on a substrate 1, an encapsulation layer 5 is prepared on one side of each light emitting device (21, 22, 23) away from the substrate 1 to encapsulate the light emitting device (21, 22, 23), then a resin material (taking a negative resin material as an example) is coated on one side of the encapsulation layer 5 away from the substrate 1 to form a first refractive index film layer 3', the thickness of the first refractive index film layer 3' is the same as that of the first refractive index film layer 3 'in the preparation of the display panel shown in fig. 5, and then a halftone mask (HTM mask) is used to expose the first refractive index film layer 3', wherein the light emitting device 21 and the light emitting device 22 are opaque to a mask at corresponding positions, the peripheries of the light emitting device 21 and the light emitting device 22 are set with low transmittance, and the light emitting device 23 is set corresponding to and the light-opaque at the corresponding positions and the peripheries of the light emitting device 23, as shown in fig. 21A.

(2) And developing the exposed first refractive index film layer 3', controlling the thickness h2 of the spacers 34 corresponding to the light emitting devices 21 and 22 to be 2um, and developing the first refractive index film layer 3' at the position corresponding to the light emitting device 23, as shown in fig. 21B.

(3) Coating a first refractive index film layer 3 ″ on the basis of the step (2), wherein the thickness of the first refractive index film layer 3 ″ is more than 2 times of that of the first refractive index film layer 3', and exposing the first refractive index film layer 3 ″ by using a half-tone mask (HTM mask), wherein the light-emitting device 23 is opaque at a position corresponding to the light-emitting device, and the light-emitting device 23 is arranged at a position edge corresponding to the opaque position by adopting low transmittance, as shown in fig. 21C.

(4) The exposed first refractive index film layer 3 ″ is subjected to a developing process, the thickness h1 of the separator 34 corresponding to the light emitting device 23 is controlled to be 4um, and the first refractive index film layer 3 ″ at the rest positions is developed to form the first refractive index layer 3, as shown in fig. 21D.

(5) A second refractive index layer 4 is formed on the side of the first refractive index layer 3 facing away from the substrate 1, as shown in fig. 7.

Based on the same disclosure concept, the embodiment of the present disclosure further provides a display device, which includes the display panel in the above embodiment. Since the principle of solving the problem of the display device is similar to that of the display panel, the implementation of the display device can be referred to the implementation of the display panel, and repeated descriptions are omitted.

The display device provided by the embodiment of the disclosure can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device are understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present disclosure.

The above-mentioned display panel and display device that this disclosed embodiment provided, because the second refractive index layer of high refractive index covers the open region, and first refractive index layer is the low refractive index layer, therefore the lateral wall of open region is the interface that the light that emitting device emitted takes place the total reflection, this disclosure sets the profile shape of the cross-section that is on a parallel with the substrate surface direction through the lateral wall of at least some open regions with first refractive index layer to including a plurality of concave-convex curves, can increase the lateral wall area of open region like this, consequently, can increase the interfacial area of total reflection, thereby improve the light quantity that takes place the total emission, and then improve emitting device's light-emitting gain.

It will be apparent to those skilled in the art that various changes and modifications may be made to the present disclosure without departing from the spirit and scope of the disclosure. Thus, if such modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include such modifications and variations as well.

Claims (16)

1. A display panel, comprising:

a substrate;

a plurality of light emitting devices having different light emitting areas, the light emitting devices being located on the substrate;

a first refractive index layer including a plurality of opening regions corresponding to the plurality of light emitting devices and a spacer enclosing the opening regions, a projection of the opening regions on the substrate at least partially overlapping a projection of the light emitting devices on the substrate; the first gradient angle of the separator corresponding to at least part of the opening area is smaller than the second gradient angle of the separator corresponding to other opening areas, and/or the height of the separator corresponding to at least part of the opening area is larger than that of the separator corresponding to other opening areas; the first refractive index layer is used for reflecting light emitted by the light-emitting device on the side wall of the opening region;

the second refractive index layer is located on one side, away from the substrate, of the first refractive index layer, the whole surface of the second refractive index layer is arranged and filled in each opening area, and the refractive index of the second refractive index layer is larger than that of the first refractive index layer.

2. The display panel of claim 1, wherein a first slope angle corresponding to the light emitting device having the largest light emitting area is smaller than a second slope angle corresponding to the light emitting device having the other light emitting area, and/or a height of a spacer corresponding to the light emitting device having the largest light emitting area is larger than a height of a spacer corresponding to the light emitting device having the other light emitting area in a direction parallel to the substrate surface.

3. The display panel of claim 1, wherein the substrate includes a plurality of first, second, and third sub-pixel regions of different colors, and the plurality of light emitting devices of different light emitting areas include a first area light emitting device corresponding to the first sub-pixel region, a second area light emitting device corresponding to the second sub-pixel region, and a third area light emitting device corresponding to the third sub-pixel region; wherein the content of the first and second substances,

the light emitting efficiency of the third sub-pixel region is lower than the light emitting efficiency of the first sub-pixel region and lower than the light emitting efficiency of the second sub-pixel region, a first slope angle corresponding to an opening region corresponding to the third sub-pixel region is smaller than a second slope angle corresponding to the opening region corresponding to the first sub-pixel region and the second sub-pixel region, and/or the height of a spacer corresponding to the opening region corresponding to the third sub-pixel region is larger than the height of a spacer corresponding to the opening region corresponding to the first sub-pixel region and the second sub-pixel region.

4. The display panel of claim 1, wherein the first slope angle is 40 ° to 50 ° and the second slope angle is 60 ° to 70 °.

5. The display panel of claim 1, wherein the at least partial opening region corresponds to a spacer having a height of 2um to 8um, and the other opening region corresponds to a spacer having a height of 1um to 4um.

6. The display panel of claim 1, wherein when the height of the spacer corresponding to at least a portion of the open region is greater than the height of the spacers corresponding to the other open regions, the spacer corresponding to the at least a portion of the open region is independently disposed from the spacers corresponding to the other open regions adjacent thereto.

7. The display panel according to any one of claims 1 to 6, wherein a sectional shape of the opening region is approximately inverted trapezoid in a thickness direction of the substrate.

8. The display panel of any one of claims 1-6, further comprising an encapsulation layer on a side of the second refractive index layer facing away from the substrate, the material of the first refractive index layer comprising polyimide and the material of the second refractive index layer comprising SiNx.

9. The display panel of any of claims 1-6, further comprising an encapsulation layer between the light emitting device and the first index layer.

10. The display panel of claim 9, further comprising: the touch structure is positioned between the packaging layer and the second refractive index layer, and the flat layer is positioned between the touch structure and the second refractive index layer; the flat layer is multiplexed into the first refractive index layer.

11. The display panel according to claim 10, wherein the touch structure includes a first touch electrode layer, a touch insulating layer, and a second touch electrode layer stacked, the first touch electrode layer is close to the substrate, and the first refractive index layer is disposed on a side of the second touch electrode layer away from the substrate.

12. The display panel of claim 11, wherein the first and second touch electrode layers comprise a plurality of metal grids comprising a plurality of metal wires that are staggered to define meshes of the metal grids, the metal wires are positioned between adjacent light emitting devices in a front projection of the substrate, and the first refractive index layer covers the metal wires.

13. The display panel of claim 9, wherein the material of the first refractive index layer comprises a resin, and the material of the second refractive index layer comprises a resin mixed with acryl particles or an acryl material.

14. The display panel according to any one of claims 1 to 6, wherein the light emitting device includes a red light emitting device, a green light emitting device, and a blue light emitting device, and the light emitting device having the largest light emitting area is the blue light emitting device.

15. The display panel according to any one of claims 1 to 6, wherein an area of an orthographic projection of the opening region on the substrate is equal to or larger than an area of an effective light emitting area of the light emitting device on the substrate.

16. A display device comprising the display panel according to any one of claims 1 to 15.

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