Display panel and display device

Abstract

Embodiments of the present application provide a display panel and a display device. The display panel includes: a light-emitting layer configured to emit a first color of light; an encapsulation layer disposed over the light-emitting layer; a Fresnel lens layer disposed on a side of the encapsulation layer facing away from the light-emitting layer, the Fresnel lens layer comprising multiple groups of optical lenses; a planarization layer covering the Fresnel lens layer; and a light conversion layer disposed on a side of the planarization layer facing away from the light-emitting layer, the light conversion layer configured to emit a second color of light and a third color of light under excitation by the first color of light.

Description

Technical Field

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

[0002] At present, quantum dot organic light emitting diode (QD-OLED) display panels are considered to be the next generation display solutions due to their excellent color gamut performance and good color display.

[0003] This display panel uses a blue organic light-emitting diode (OLED) as a backlight source to excite photochromic QD particles, generating distinct red and green lights, thereby achieving full-color display. However, because OLEDs are a surface light source, the QD particles have a low utilization rate of the light emitted by the OLEDs, which in turn affects the display quality. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a display panel and a display device, so as to improve the light utilization rate of QD particles on organic light emitting diodes, thereby improving the display effect.

[0005] In a first aspect, the present application proposes a display panel, comprising: a light-emitting layer, configured to emit a first color of light; an encapsulation layer, arranged to cover the light-emitting layer; a Fresnel lens layer, arranged on a side of the encapsulation layer away from the light-emitting layer, the Fresnel lens layer comprising a plurality of groups of optical lenses; a flat layer, covering the Fresnel lens layer; and a light conversion layer, arranged on a side of the flat layer away from the light-emitting layer, the light conversion layer being configured to emit a second color of light and a third color of light under the excitation of the first color of light.

[0006] The embodiment of the present application provides a Fresnel lens layer between the encapsulation layer and the flat layer of the display panel, which is beneficial to improving the utilization rate of light by QD particles, thereby improving the display effect. Since OLED is a surface light source, when it is directly irradiated on the light conversion layer, the light is relatively scattered, which in turn causes the quantum dots in the light conversion layer to have a low utilization rate of light, and the light conversion effect is poor. It may even happen that the quantum dots cannot be excited by the surface light source, thereby affecting the display effect. Therefore, the embodiment of the present application provides a Fresnel lens layer on the side of the encapsulation layer away from the light-emitting layer. The Fresnel lens layer includes multiple groups of optical lenses that have a converging effect on light. When the light is converged by the optical lenses of the Fresnel lens layer and irradiated on the light conversion layer, the quantum dots in the light conversion layer are excited by more intense concentrated light, which is beneficial to improving the utilization rate of the light of the light-emitting layer by the light conversion layer, and improving the light conversion efficiency of the light conversion layer, thereby improving the color display of the display panel.

[0007] The display panel according to the embodiment of the present application may also have the following additional technical features:

[0008] In some embodiments of the present application, each group of optical lenses includes a ring-shaped prism, the cross-sectional shape of the prism is a right triangle, the right-angled side of the right triangle is arranged close to the center of the ring, and the centers of the circles of each group of optical lenses coincide.

[0009] In some embodiments of the present application, each group of optical lenses includes two symmetrically arranged prisms, the cross-sectional shape of the prisms is a right triangle, the right-angled sides of the right triangle are arranged close to the axis of symmetry, and the axes of symmetry of each group of optical lenses coincide.

[0010] In some embodiments of the present application, there is no overlap or gap between the orthographic projections of any two adjacent groups of optical lenses on the packaging layer.

[0011] In some embodiments of the present application, in any two adjacent groups of the optical lenses, the height of the prisms away from the center of the circle or the axis of symmetry is greater than the height of the prisms close to the center of the circle or the axis of symmetry.

[0012] In some embodiments of the present application, the heights of the prisms of the multiple groups of optical lenses are equal.

[0013] In some embodiments of the present application, the display panel further includes a multi-layer filling layer located between the Fresnel lens layer and the flat layer, the number of the filling layers is equal to the number of groups of the optical lenses, and each of the filling layers covers at least each group of the optical lenses.

[0014] In some embodiments of the present application, the surface of the filling layer away from the encapsulation layer is a curved surface, and multiple layers of the filling layers are stacked in the thickness direction of the display panel. In any two adjacent filling layers, the refractive index of the filling layer away from the encapsulation layer is smaller than the refractive index of the filling layer close to the encapsulation layer.

[0015] In some embodiments of the present application, the optical lenses are in four groups and the filling layers are in four layers.

[0016] A second aspect of the present application provides a display device comprising the display panel described in the first aspect. The Fresnel lens layer in the display panel functions to converge light. When light is converged by the optical lenses of the Fresnel lens layer and then irradiated onto the light conversion layer, the quantum dots within the light conversion layer are excited by the more intense concentrated light. This improves the light conversion layer's utilization of light from the luminescent layer, increasing the light conversion efficiency of the light conversion layer and thereby enhancing the color display of the display panel and the display device.

[0017] Of course, it is not necessary to achieve all the advantages described above at the same time when implementing any product or method of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0019] Figure 1 A schematic structural diagram of a display panel according to an embodiment of the present application;

[0020] Figure 2 This is a schematic diagram of the projection of the optical lens on the packaging layer according to an embodiment of the present application;

[0021] Figure 3 Schematic diagram of the optical path of light propagating through an optical lens;

[0022] Figure 4 This is a schematic diagram of the projection of another optical lens on the packaging layer according to an embodiment of the present application;

[0023] Figure 5 A schematic structural diagram of a display panel according to an embodiment of the present application;

[0024] Figure 6 FIG. 1 is a schematic structural diagram of another display panel according to an embodiment of the present application. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field based on this application are within the scope of protection of this application.

[0026] In related technologies, display panels use blue organic light-emitting diodes (OLEDs) as backlight sources to excite photochromic QD particles, generating distinct red and green lights, thereby achieving full-color display. However, because OLEDs are surface light sources, the QD particles have a low efficiency in utilizing the light emitted by the OLEDs, which in turn affects the display quality.

[0027] Based on the above problems, Figure 1 As shown, in a first aspect, the present application provides a display panel 100. Display panel 100 includes a light-emitting layer 110, an encapsulation layer 120, a Fresnel lens layer 130, a planarization layer 140, and a light conversion layer 150. Light-emitting layer 110 is configured to emit light of a first color. Encapsulation layer 120 is disposed over light-emitting layer 110. Fresnel lens layer 130 is disposed on a side of encapsulation layer 120 facing away from light-emitting layer 110 and includes multiple groups of optical lenses 131. Planarization layer 140 covers Fresnel lens layer 130. Light conversion layer 150 is disposed on a side of planarization layer 140 facing away from light-emitting layer 110 and is configured to emit light of a second color and a third color when stimulated by light of the first color.

[0028] In an embodiment of the present application, the light-emitting layer 110 is configured to emit a first color of light. Specifically, the first color of light may be blue light. The light-emitting layer 110 may be a blue organic light-emitting diode (OLED). OLED is a surface light source with relatively uniform illumination. Therefore, the light source does not need to be diffused. Typically, an OLED includes an anode, a cathode, and a light-emitting material located between the anode and the cathode. In some other embodiments, the OLED also includes a hole injection layer, an electron injection layer, a hole transport layer, an electron transport layer, a pixel definition layer (PDL), and an organic support layer (PS, Post Spacer) and other structures. The light-emitting principle is as follows: under external voltage drive, the anode and the cathode transmit holes and electrons respectively. The electrons and holes meet in the light-emitting material, forming excitons and exciting the light-emitting molecules in the light-emitting material, which emit visible light through radiative relaxation. The encapsulation layer 120 is used to protect the light-emitting layer to avoid corrosion by water and oxygen. Typically, the encapsulation layer 120 may include two inorganic layers and one organic layer, with the organic layer located between the two inorganic layers.

[0029] In the embodiment of the present application, the light conversion layer 150 is configured to emit a second color light and a third color light under the excitation of the first color light. Correspondingly, when the first color light is blue light, the second color light can be red light, and the third color light can be green light, thereby achieving full-color display of the display panel 100. The light conversion layer 150 utilizes quantum dot (QD) technology. Quantum dot technology means that quantum dots of different sizes will emit different colors of fluorescence under the excitation of excitation light. Therefore, the light conversion layer 150 is composed of quantum dot nanoparticles and scattering particles of different sizes mixed in a resin (doping ratio ≤ 60%). The light conversion layer 150 can be divided into a red light conversion region and a green light conversion region. Generally, the QD particle size of the red light conversion region is between 3nm and 7nm, and the QD particle size of the green light conversion region is between 4 and 6nm.

[0030] The embodiment of the present application is to provide a Fresnel lens layer 130 between the encapsulation layer 120 and the flat layer 140 of the display panel 100, thereby improving the utilization rate of light by the QD particles, thereby improving the display effect. Since the OLED is a surface light source, when it is directly irradiated on the light conversion layer 150, the light is relatively scattered, which causes the quantum dots in the light conversion layer 150 to have a low utilization rate of light, and the light conversion effect is poor. It may even be the case that the quantum dots cannot be excited by the OLED surface light source, thereby affecting the display effect. Therefore, the embodiment of the present application is provided with a Fresnel lens layer 130 on the side of the encapsulation layer 120 away from the light-emitting layer 110. The Fresnel lens layer 130 includes multiple groups of optical lenses 131, and the optical lenses 131 have a converging effect on light. When the light E is converged by the optical lens 131 of the Fresnel lens layer 130 and irradiated on the light conversion layer 150, the quantum dots in the light conversion layer 150 are excited by the more intense concentrated light, which is beneficial to improving the utilization rate of the light of the light-emitting layer 110 by the light conversion layer 150, thereby improving the conversion efficiency of the light conversion layer 150, and further beneficial to improving the color display of the display panel.

[0031] In some embodiments of the present application, each group of optical lenses 131 includes a ring-shaped prism 132, the cross-sectional shape of the prism 132 is a right triangle, the right-angled side of the right triangle is arranged close to the center of the ring, and the center M of each group of optical lenses 131 coincides.

[0032] like Figure 2 As shown, each group of optical lenses 131 includes a ring-shaped prism 132. The centers M of the optical lenses 131 coincide with each other, and the multiple groups of optical lenses 131 form concentric rings with M as the center. In other words, the multiple groups of optical lenses 131 are nested and arranged on the packaging layer 120 from the inside to the outside. Figure 1As shown, the cross-section of each group of prisms 132 is a right triangle. By placing the right angle side of the right triangle close to the center M, the light E is converged.

[0033] like Figure 3 The figure shows a schematic diagram of the structure of the transmission of light E of one group of optical lenses 131. The right-angled side of the optical lens 131 is set close to the center M of the circle, and the right triangle in cross section has a first right-angled side a and a second right-angled side b, and a hypotenuse third side c. When the light E of the light-emitting layer 110 enters the optical lens 131, the light E enters the first side a of the prism 132 in close contact with the encapsulation layer 120 at a vertical angle. At this time, the light E will not be deflected. When the light E continues to propagate and contacts the hypotenuse third side c, due to the different refractive indices on both sides of the third side c and the non-zero angle of incidence, it will be refracted on the third side c, causing the light E to be deflected toward the center M of the circle. Specifically, the incident angle of the light ray E is defined as t, the emergent angle of the light ray E is defined as p, the height of the incident point is defined as h, the horizontal distance between the light ray E and the center M when it is emitted from the light-emitting layer 110 is defined as d, a perpendicular line L is drawn perpendicular to the display panel 100 with the center M as the perpendicular line, and the light ray E is emitted from the third side c and intersects with the perpendicular line L at the focus M1. The vertical distance from the focus M1 to the center M is defined as f, the angle between the light ray E and the perpendicular line L after being refracted by the third side c is defined as k, and the angle between the first side a and the third side c is defined as n.

[0034] From the geometric relationship of right angles, we know that t = n; p = t + k;

[0035] but, That is to say

[0036] As can be seen from the above relationship, when the angle n of the prism changes, the focal length f also changes accordingly. That is, in the embodiment of the present application, by adjusting the length of f and the value of d, the area where the light E emitted from the surface light source of the light-emitting layer 110 converges can be flexibly set, thereby achieving a regionally defined light concentration area. When the light E is converged by the optical lens 131 of the Fresnel lens layer 130 and irradiated on the light conversion layer 150, the quantum dots within the light conversion layer 150 are excited by the more intense concentrated light, thereby improving the light conversion layer 150's utilization of the light from the light-emitting layer 110, thereby improving the light conversion efficiency of the light conversion layer 150, and further improving the color display of the display panel.

[0037] In some embodiments of the present application, Figure 1 and Figure 4 As shown, each set of optical lenses 131 includes two symmetrically arranged prisms 132. The cross-section of the prisms 132 is a right triangle. The right angles of the right triangle are arranged close to the axis of symmetry. The axes of symmetry of each set of optical lenses 131 coincide with each other.

[0038] In the embodiment of the present application, the shape of each group of optical lenses 131 of the Fresnel lens layer 130 has changed. Each group of optical lenses 131 has changed from one annular prism 132 to two symmetrically arranged prisms 132. Figure 4 As shown, it can be two symmetrically arranged individual prisms 132, and the orthographic projections on the packaging layer 120 can be two symmetrically arranged rectangles. Multiple groups of optical lenses 131 are nested and arranged on the packaging layer 120 from the inside to the outside. The Fresnel lens layer 130 of the embodiment of the present application has a light collecting effect. Figure 3 As shown, by adjusting the length of f and the value of d, the area where light E emitted from the surface light source of the light-emitting layer 110 converges can be flexibly set, thereby achieving a regionally defined light concentration area. When light E is converged by the optical lens 131 of the Fresnel lens layer 130 and irradiated on the light conversion layer 150, the quantum dots within the light conversion layer 150 are excited by the more intense concentrated light, thereby improving the light conversion layer 150's utilization of the light from the light-emitting layer 110 and the light conversion efficiency of the light conversion layer 150, thereby enhancing the color display of the display panel.

[0039] In some embodiments of the present application, there is no overlap or gap between the orthographic projections of any two adjacent groups of optical lenses 131 on the encapsulation layer 120 .

[0040] like Figure 2 As shown, when the prisms 132 of each optical lens group 131 are annular, the orthographic projections of the multiple optical lens groups 131 on the packaging layer 120 are combined to form a concentric circle centered at the center M. This facilitates the processing and manufacturing of the multiple optical lens groups 131. On the other hand, multiple groups of optical lenses 131 divide the plane of the entire display panel 100 into two parts. The first part is the inner ring area 133 of the circular prism 132 of a group of optical lenses 131 that is closest to the center of the circle M. This inner ring area 133 is not covered by the orthographic projection of the multiple groups of optical lenses 131, and the light E is directly emitted from the light-emitting layer 110 without being refracted; the second part is the area covered by the orthographic projection of the multiple groups of optical lenses 131 on the encapsulation layer 120. The light E emitted from the light-emitting layer 110 from the area of ​​the second part will be refracted by the multiple groups of optical lenses 131, which is beneficial to increase the contact area between the optical lens 131 and the encapsulation layer 120, and further beneficial to improve the utilization rate of the light emitted by the light-emitting layer 110.

[0041] In some other embodiments of the present application, Figure 4As shown, when each group of optical lenses 131 includes two symmetrically arranged prisms 132, the orthographic projections of the multiple groups of optical lenses 131 on the encapsulation layer 120 are multiple rectangles arranged in parallel without overlap or spacing. In other words, each group of optical lenses 131 includes two right-angled triangular prisms, which facilitates the processing and manufacturing of the optical lenses 131. On the other hand, the display panel 100 is generally also roughly rectangular. By arranging optical lenses 131 with orthographic projections as rectangles, and without overlap or spacing in the orthographic projections, it is beneficial to further increase the contact area between the optical lenses 131 and the encapsulation layer 120, thereby further improving the utilization rate of the light emitted by the light-emitting layer 110.

[0042] like Figure 5 As shown, in some embodiments of the present application, in any two adjacent groups of optical lenses 131, the height of the prisms 132 away from the center M or the axis of symmetry is greater than the height of the prisms 132 near the center M or the axis of symmetry. When each prism 132 of the multiple groups of optical lenses 131 is annular, in any two adjacent groups of optical lenses 131, the height of the prisms 132 away from the center M is greater than the height of the prisms 132 near the center M. When each optical lens 131 of the multiple groups of optical lenses 131 includes two symmetrically arranged prisms 132, in any two adjacent groups of optical lenses 131, the height of the prisms 132 away from the axis of symmetry is greater than the height of the prisms 132 near the axis of symmetry. In the embodiment of the present application, by designing multiple groups of optical lenses 131 with increasing heights from the inside to the outside, it is beneficial to converge the light toward a specific area, such as toward the area above the center M or the axis of symmetry, thereby improving the utilization rate of the light of the light-emitting layer 110 by the light conversion layer 150, and improving the conversion efficiency of the light conversion layer 150, which is beneficial to improving the color display of the display panel.

[0043] like Figure 1 As shown, in some embodiments of the present application, the heights of the prisms 132 of the multiple sets of optical lenses 131 are all equal. This helps to simplify the process of the multiple sets of optical lenses 131 and reduce the production cost of the Fresnel lens layer 130.

[0044] like Figure 6 As shown, in some embodiments of the present application, the display panel 100 further includes a multi-layer filling layer 160 located between the Fresnel lens layer 130 and the flat layer 140. The number of filling layers 160 is equal to the number of groups of optical lenses 131, and each filling layer 160 covers at least each group of optical lenses 131. The provision of the filling layer 160 facilitates protection of the multiple groups of optical lenses 131.

[0045] Furthermore, if Figure 6As shown, the surface of the filling layer 160 on one side away from the encapsulation layer 120 is a curved surface. In the thickness direction of the display panel 100, multiple filling layers 160 are stacked. In any two adjacent filling layers 160, the refractive index of the filling layer 160 away from the encapsulation layer 120 is smaller than the refractive index of the filling layer 160 close to the encapsulation layer 120. In the embodiment of the present application, multiple filling layers 160 are stacked on the Fresnel lens layer 130, and the refractive index of each filling layer 160 is different. The farther the filling layer 160 is from the encapsulation layer 120, the smaller the refractive index. This arrangement ensures that the light emitted by the multiple groups of optical lenses 131 is also refracted by the multiple filling layers 160, and the degree of deflection in different filling layers 160 is different, which makes it easier to control the direction of light deflection.

[0046] Furthermore, if Figure 6 As shown, the optical lenses 131 are arranged in four groups, and the filling layer 160 is composed of four layers. Specifically, the optical lenses 131 include a first optical lens 133, a second optical lens 134, a third optical lens 135, and a fourth optical lens 136, which are nested from the center outward. The filling layer 160 includes a first filling layer 161, a second filling layer 162, a third filling layer 163, and a fourth filling layer 164, which are sequentially arranged away from the encapsulation layer 120. The refractive index of the first filling layer 161 is greater than that of the second filling layer 162; the refractive index of the second filling layer 162 is greater than that of the third filling layer 163; and the refractive index of the third filling layer 163 is greater than that of the fourth filling layer 164. By setting up four groups of optical lenses 131 and four filling layers 160 with different refractive indices, the light is first refracted by the four groups of optical lenses 131 and then refracted by the four filling layers 160, and then converges toward the center M or the area above the axis of symmetry, which is beneficial to improving the utilization rate of the light of the light-emitting layer 110 by the light conversion layer 150, thereby improving the conversion efficiency of the light conversion layer 150, and further beneficial to improving the color display of the display panel.

[0047] like Figure 1 As shown, in some embodiments of the present application, the display panel 100 further includes a light filter layer 170 located on a side of the light conversion layer 150 away from the display panel 100. The light filter layer 170 is configured to transmit light of a specific color and reflect light of non-specific colors after passing through the light filter layer 170. For example, the light filter layer 170 generally includes a red light filter layer, a blue light filter layer, and a green light filter layer. When light passes through the light conversion layer 150, it is mixed into white light. The white light is then filtered into three basic pigment matrices of red, blue, and green after passing through the different light filter layers 170, thereby achieving color display on the display panel 100.

[0048] like Figure 1As shown, in some embodiments of the present application, the display panel 100 further includes a thin-film transistor layer 180, which is disposed on the side of the light-emitting layer 110 facing away from the Fresnel lens layer 130. The thin-film transistor layer 180 is used to provide a driving voltage to the light-emitting layer 110. It may generally include a gate electrode, a gate insulation layer, an active layer, a dielectric layer, a source / drain metal layer, a passivation layer, and other structures. It should be noted that the structure of the thin-film transistor layer 180 is not limited to this and can be determined based on actual needs.

[0049] A second aspect of the present application provides a display device, comprising the display panel 100 described in the first aspect.

[0050] The display device of the embodiment of the present application includes the display panel 100 described in the first aspect. The Fresnel lens layer 130 in the display panel 100 has a light collecting effect. Figure 3 As shown, by adjusting the length of f and the value of d, the area where light E emitted from the surface light source of the light-emitting layer 110 converges can be flexibly set, thereby achieving a regionally defined light concentration area. When light E is concentrated by the optical lens 131 of the Fresnel lens layer 130 and irradiated on the light conversion layer 150, the quantum dots within the light conversion layer 150 are excited by the more intense concentrated light, thereby improving the light conversion layer 150's utilization of the light from the light-emitting layer 110 and the light conversion efficiency of the light conversion layer 150, thereby improving the color display of the display panel 100 and the display device.

[0051] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It will also be understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it will be understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it will also be understood that when a layer or element is referred to as being "between" two layers or elements, it may be the only layer between the two layers or elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.

[0052] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0053] Each embodiment in this specification is described in a related manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiment is generally similar to the method embodiment, so the description is relatively simple. For related parts, refer to the description of the method embodiment.

[0054] The above description is only a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application are included in the scope of protection of the present application.

Claims

1. A display panel, characterized in that: include: a light-emitting layer configured to emit light of a first color; an encapsulation layer, the encapsulation layer being arranged to cover the light-emitting layer; a Fresnel lens layer, the Fresnel lens layer being arranged on a side of the encapsulation layer away from the light-emitting layer, the Fresnel lens layer comprising a plurality of optical lens groups; a flat layer, the flat layer covering the Fresnel lens layer; a light conversion layer, the light conversion layer being disposed on a side of the planar layer away from the light-emitting layer, the light conversion layer being configured to emit a second color light and a third color light under the excitation of the first color light; The display panel further includes a plurality of filling layers located between the Fresnel lens layer and the flat layer, wherein the number of the filling layers is equal to the number of the optical lens groups, and each filling layer at least covers each group of the optical lenses; The surface of the filling layer away from the encapsulation layer is a curved surface. In the thickness direction of the display panel, multiple filling layers are stacked. In any two adjacent filling layers, the refractive index of the filling layer away from the encapsulation layer is smaller than the refractive index of the filling layer close to the encapsulation layer.

2. The display panel according to claim 1, wherein: Each group of optical lenses includes a ring-shaped prism, the cross-section of the prism is a right triangle, the right-angled side of the right triangle is arranged close to the center of the ring, and the centers of the optical lenses of each group coincide.

3. The display panel according to claim 1, wherein: Each group of optical lenses includes two symmetrically arranged prisms, the cross-section of the prisms is a right triangle, the right-angled sides of the right triangle are arranged close to the symmetry axis, and the symmetry axes of each group of optical lenses coincide.

4. The display panel according to any one of claims 1 to 3, wherein: There is no overlap or spacing between the orthographic projections of any two adjacent groups of optical lenses on the packaging layer.

5. The display panel according to claim 2 or 3, wherein: In any two adjacent groups of the optical lenses, the heights of the prisms farther away from the center of the circle or the axis of symmetry are greater than the heights of the prisms closer to the center of the circle or the axis of symmetry.

6. The display panel according to claim 2 or 3, characterized in that: The heights of the prisms of the multiple groups of optical lenses are all equal.

7. The display panel according to claim 1, wherein: The optical lenses are in four groups, and the filling layers are in four layers.

8. A display device comprising the display panel according to any one of claims 1 to 7.

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