A display panel and a display device

Abstract

The present invention discloses a display panel and a display device. By adding a first refractive structure above the first light-emitting element in the first display area and a second refractive structure above the second light-emitting element in the second display area, the minimum distance between the first light-emitting element and the first sub-refractive structure of the first refractive structure is set as D1, and the minimum distance between the second light-emitting element and the third sub-refractive structure of the second refractive structure is set as D2, where D1 < D2. Using the principle of refraction, more perspective light rays in the first display area are deflected towards the positive viewing angle at the interface between the first sub-refractive structure and the second sub-refractive structure. With a relatively small set driving current, the light-emitting brightness of the first display area is increased, the light-emitting brightness of the first display area and the second display area is ensured to be uniform, which plays a role in prolonging the light-emitting life of the first light-emitting element in the first display area, reducing the risk of burn-in damage due to excessive current, and stabilizing the visual imaging effect of the display panel.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technologies, and in particular, to a display panel and a display device. Background Art

[0002] With the development of display technologies, full-screen displays almost occupy a large proportion of the consumer market and have become a hot topic in the development direction. Taking mobile phones as an example, smart phones are used more and more widely and have more and more functions, and have become an essential electronic device in people's daily lives.

[0003] Although full-screen products have many advantages, with the increase in the screen display area, many problems have also arisen in mobile phone design. For example, the display brightness of the normal display area and the Camera under Panel (CUP) area in the display panel is uneven, which affects the imaging effect of the display panel. Summary of the Invention

[0004] The present invention provides a display panel and a display device. By differently designing the refractive structures above the light-emitting elements in the normal display area and the light-transmitting area of the display panel, the refractive structure above the light-emitting element in the light-transmitting area deflects more large-angle light rays towards the front-angle light rays. While ensuring uniform display in the normal display area and the light-transmitting area, the driving current of the light-transmitting area is reduced, the luminous life of the light-emitting element in the light-transmitting area is extended, and the risk of screen burn and damage due to excessive current in the light-transmitting area is reduced.

[0005] An embodiment of the present invention provides a display panel, including a first display area and a second display area, where the second display area surrounds at least part of the first display area;

[0006] The display panel further includes a first light-emitting element located in the first display area and a first refractive structure located on the light-emitting side of the first light-emitting element. The first refractive structure includes a first sub-refractive structure and a second sub-refractive structure. The second sub-refractive structure covers the first sub-refractive structure, and the refractive index of the second sub-refractive structure is greater than that of the first sub-refractive structure; the first sub-refractive structure includes a first opening, and along the thickness direction of the display panel, the first opening covers the first light-emitting element; along a first direction, the minimum distance between the first light-emitting element and the first sub-refractive structure is D1; the first direction is parallel to the plane where the substrate of the display panel is located;

[0007] The display panel further includes a second light-emitting element located in the second display area and a second refractive structure located on the light-emitting side of the second light-emitting element. The second refractive structure includes a third sub-refractive structure and a fourth sub-refractive structure. The fourth sub-refractive structure covers the third sub-refractive structure, and the refractive index of the fourth sub-refractive structure is greater than that of the third sub-refractive structure. The third sub-refractive structure includes a second opening, and along the thickness direction of the display panel, the second opening covers the second light-emitting element. Along the first direction, the minimum distance between the second light-emitting element and the third sub-refractive structure is D2. Among them, D1 < D2.

[0008] In a second aspect, an embodiment of the present invention further provides a display device, including the display panel provided in the first aspect.

[0009] In the display device provided by the embodiment of the present invention, by adding a first refractive structure above the first light-emitting element in the first display area and adding a second refractive structure above the second light-emitting element in the second display area, and using the refraction principle, the first refractive structure deflects the large-angle light emitted by the first light-emitting element towards the positive viewing angle, and the second refractive structure deflects the large-angle light emitted by the second light-emitting element towards the positive viewing angle, thereby improving the light-emitting brightness of the display panel in the positive viewing angle. Further, the minimum distance between the first light-emitting element and the first sub-refractive structure of the first refractive structure is set as D1, and the minimum distance between the second light-emitting element and the third sub-refractive structure of the second refractive structure is D2, where D1 < D2, so that the light of more viewing angles in the first display area is deflected towards the positive viewing angle at the interface between the first sub-refractive structure and the second sub-refractive structure, thereby further improving the large-angle light-emitting brightness of the first display area, satisfying that the light-emitting brightness of the first display area and the second display area is uniform under the setting of a smaller driving current, thereby playing a role in prolonging the light-emitting life of the first light-emitting element in the first display area, reducing the risk of screen burning and damage in the first display area due to excessive current, and playing a role in stabilizing the visual imaging effect of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic structural diagram of a display panel provided by the prior art;

[0011] Figure 2 is Figure 1 a cross-sectional structural diagram of a display panel along the AA' direction in

[0012] Figure 3 is a schematic structural diagram of a display panel provided by an embodiment of the present invention;

[0013] Figure 4 is Figure 3 a cross-sectional structural diagram of a display panel along the BB' direction in

[0014] Figure 5 It is a schematic diagram of the light range of a light-emitting element provided by an embodiment of the present invention;

[0015] Figure 6 It is a schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0016] Figure 7 It is a schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0017] Figure 8 It is a schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0018] Figure 9 It is a schematic diagram of the light range of another light-emitting element provided by an embodiment of the present invention;

[0019] Figure 10 It is a schematic diagram of the light range of another light-emitting element provided by an embodiment of the present invention;

[0020] Figure 11 It is a schematic diagram of the light range of another light-emitting element provided by an embodiment of the present invention;

[0021] Figure 12 It is a schematic diagram of the light range of another light-emitting element provided by an embodiment of the present invention;

[0022] Figure 13 It is a schematic diagram of the light range of another light-emitting element provided by an embodiment of the present invention;

[0023] Figure 14 It is a schematic diagram of the light range of another light-emitting element provided by an embodiment of the present invention;

[0024] Figure 15 It is a schematic diagram of the light range of another light-emitting element provided by an embodiment of the present invention;

[0025] Figure 16 It is a schematic diagram of the light range of another light-emitting element provided by an embodiment of the present invention;

[0026] Figure 17 It is a schematic structural diagram of another display panel provided by an embodiment of the present invention;

[0027] Figure 18 It is Figure 17 a schematic diagram of the interface of a display panel along the CC' direction in;

[0028] Figure 19 It is Figure 3 a schematic cross-sectional structure diagram of another display panel along the BB' direction in;

[0029] Figure 20It is a schematic structural diagram of a display device provided by an embodiment of the present invention. Detailed implementation manners

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the sake of description, only parts related to the present invention rather than all structures are shown in the drawings.

[0031] Figure 1 It is a schematic structural diagram of a display panel provided by the prior art; Figure 2 is Figure 1 A cross-sectional structural diagram of a display panel along the AA' direction in. Combining Figure 1 and Figure 2 As shown, a display panel 100 in the prior art includes a normal display area 11 and an area 12 for setting a camera under the panel (CUP). The arrangement density of the light-emitting elements 13 in the CUP area 12 is less than that of the light-emitting elements 13 in the normal display area 11. Usually, the driving current of the light-emitting elements in the CUP area 12 is increased to improve the light output brightness of the CUP area 12, so that the light-emitting brightness of the CUP area 12 is uniform with that of the normal display area 11. However, the relatively large driving current affects the luminous life of the light-emitting elements in the CUP area 12, and there is a risk of burn-in damage to the CUP area 12, ultimately affecting the visual imaging effect of the display panel.

[0032] Based on the above technical problems, the inventors have found through research that by adding a refractive structure above the light-emitting element and using the principle of refraction to deflect the light emitted at a large angle by the light-emitting element towards the front view angle of the light-emitting element, the large-view-angle light-emitting brightness of the panel can be improved; increasing the deflection of the large-view-angle light by the refractive structure in the CUP area can reduce the driving current, extend the luminous life of the light-emitting element in the CUP area, reduce the risk of burn-in damage in the CUP area, and improve the visual imaging effect of the display panel. Based on this, the inventors have further developed the technical solution of the embodiment of the present invention. Specifically, the embodiment of the present invention provides a display panel including a first display area and a second display area, and the second display area surrounds at least part of the first display area; the display panel further includes a first light-emitting element located in the first display area and a first refractive structure located on the light-emitting side of the first light-emitting element. The first refractive structure includes a first sub-refractive structure and a second sub-refractive structure. The second sub-refractive structure covers the first sub-refractive structure, and the refractive index of the second sub-refractive structure is greater than that of the first sub-refractive structure; the first sub-refractive structure includes a first opening, and along the thickness direction of the display panel, the first opening covers the first light-emitting element; along a first direction, the minimum distance between the first light-emitting element and the first sub-refractive structure is D1; the first direction is parallel to the plane where the substrate of the display panel is located; the display panel further includes a second light-emitting element located in the second display area and a second refractive structure located on the light-emitting side of the second light-emitting element. The second refractive structure includes a third sub-refractive structure and a fourth sub-refractive structure. The fourth sub-refractive structure covers the third sub-refractive structure, and the refractive index of the fourth sub-refractive structure is greater than that of the third sub-refractive structure; the third sub-refractive structure includes a second opening, and along the thickness direction of the display panel, the second opening covers the second light-emitting element; along the first direction, the minimum distance between the second light-emitting element and the third sub-refractive structure is D2; wherein, D1 < D2.

[0033] Adopting the above technical solution, by adding a first refractive structure above the first light-emitting element in the first display area and a second refractive structure above the second light-emitting element in the second display area, the first refractive structure and the second refractive structure respectively deflect the large-view-angle light emitted by the first light-emitting element and the second light-emitting element towards the front view angle, improving the overall light-emitting brightness of the display panel; further, setting the minimum distance between the first light-emitting element and the first sub-refractive structure of the first refractive structure as D1, and the minimum distance between the second light-emitting element and the third sub-refractive structure of the second refractive structure as D2, D1 < D2, that is, setting the first sub-refractive structure close to the first light-emitting element, so that the light from more viewing angles in the first display area is deflected towards the front view angle at the interface between the first sub-refractive structure and the second sub-refractive structure, thereby further improving the light-emitting brightness of the first display area, meeting the requirement that the light emission of the first display area and the second display area is uniform under the setting of a smaller driving current, and thus playing a role in extending the luminous life of the first light-emitting element in the first display area (CUP area), reducing the risk of burn-in damage in the CUP area, and improving the visual imaging effect of the display panel.

[0034] The above is the core idea of the present invention. Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the protection scope of the present invention.

[0035] Figure 3 It is a schematic structural diagram of a display panel provided by an embodiment of the present invention; Figure 4 is Figure 3 a cross-sectional structural schematic of a display panel along the BB' direction in; Figure 5 It is a schematic diagram of the light range of a light-emitting element provided by an embodiment of the present invention. Combining Figures 3 - 5 As shown, a display panel 200 provided by an embodiment of the present invention includes a first display area 21 and a second display area 22, and the second display area 22 surrounds at least part of the first display area 21; the display panel 200 further includes a first refractive structure 30 located on the light-emitting side of the first light-emitting element in the first display area 21. The first refractive structure 30 includes a first sub-refractive structure 31 and a second sub-refractive structure 32. The second sub-refractive structure 32 covers the first sub-refractive structure 31, and the refractive index of the second sub-refractive structure 32 is greater than that of the first sub-refractive structure 31; the first sub-refractive structure 31 includes a first opening. Along the thickness direction of the display panel (as shown by the Z direction in the figure), the first opening covers the first light-emitting element 41; along the first direction (as shown by the X direction in the figure), the minimum distance between the first light-emitting element 41 and the first sub-refractive structure 31 is D1; the first direction is parallel to the plane where the substrate of the display panel is located; the display panel 200 further includes a second light-emitting element 42 located in the second display area 22 and a second refractive structure 50 located on the light-emitting side of the second light-emitting element 42. The second refractive structure 50 includes a third sub-refractive structure 51 and a fourth sub-refractive structure 52. The fourth sub-refractive structure 52 covers the third sub-refractive structure 51, and the refractive index of the fourth sub-refractive structure 52 is greater than that of the third sub-refractive structure 51; the third sub-refractive structure 52 includes a second opening. Along the thickness direction of the display panel, the second opening covers the second light-emitting element 42; along the first direction, the minimum distance between the second light-emitting element 42 and the third sub-refractive structure 51 is D2; wherein, D1 < D2.

[0036] Specifically, the display panel 200 includes a Light Emitting Diode (LED) display panel, a Micro Light Emitting Diode (Micro LED) display panel, an Organic Light Emitting Diode (OLED) display panel, an Active-Matrix Organic Light Emitting Diode (AMOLED) display panel, a Quantum Dot Light Emitting Diodes (QLED) display panel, etc. The embodiments of the present invention do not limit the specific light-emitting type of the display panel. The first display area 21 can be a device setting area, a light-transmitting area, such as a Camera under Panel (CUP) setting area, which is used to balance the display function and the light-transmitting function; the second display area 22 is a normal display area (Active Area, AA) that can display images normally. Using the principle of light refraction, a first refractive structure 30 is added on the light-emitting side of the first light-emitting element 41 in the first display area 21, and a second refractive structure 50 is added on the light-emitting side of the second light-emitting element 42 in the second display area 22. The first refractive structure 30 is set to include two first refractive sub-structures 31 and 32 with different refractive indices, and the second refractive sub-structure 32 covers the first refractive sub-structure 31; the second refractive structure 50 is set to include two third refractive sub-structures 51 and 52 with different refractive indices, and the fourth refractive sub-structure 52 covers the third refractive sub-structure 51. Among them, the refractive index of the first refractive sub-structure 31 is less than that of the second refractive sub-structure 32, and the refractive index of the third refractive sub-structure 51 is less than that of the fourth refractive sub-structure 52. The materials of the first refractive sub-structure 31 and the third refractive sub-structure 51 can be the same or different, and the materials of the second refractive sub-structure 32 and the fourth refractive sub-structure 52 can be the same or different.

[0037] In combination with, such as Figure 3As shown, the large-angle light S1 emitted by the first light-emitting element 41 reaches the first refractive photon structure 31 and is refracted in the positive X direction in the figure at the interface between the first refractive photon structure 31 and the second refractive photon structure 32 and exits in the small-angle S1” direction. Compared with the normal emission direction S1’, the positive emission efficiency of the large-angle light S1 is improved; similarly, the large-angle light S2 emitted by the second light-emitting element 42 reaches the first refractive photon structure 51 and is refracted in the positive X direction in the figure at the interface between the third refractive photon structure 51 and the fourth refractive photon structure 52 and exits in the small-angle S2” direction. Compared with the normal emission direction S2’, the positive emission efficiency of the large-angle light S2 is improved. By adding a refractive structure above the light-emitting element, the overall light-emitting brightness of the display panel is improved.

[0038] In the light-emitting direction of the first light-emitting element 41, the first refractive photon structure 31 includes a first opening. The first opening can be circular, rectangular, etc. The vertical projection of the first opening on the plane of the substrate 60 covers the vertical projection of the first light-emitting element 41 on the plane of the substrate 60. By setting the first opening, the blocking of the positive-view angle light of the first light-emitting element 41 by the first refractive photon structure 31 is reduced, ensuring the positive-view angle light-emitting brightness; in the light-emitting direction of the second light-emitting element 42, the third refractive photon structure 51 includes a second opening. The second opening can be circular, rectangular, etc. The vertical projection of the second opening on the plane of the substrate 60 covers the vertical projection of the second light-emitting element 42 on the plane of the substrate 60. By setting the second opening, the blocking of the positive-view angle light of the second light-emitting element 42 by the third refractive photon structure 51 is reduced, ensuring the positive-view angle light-emitting brightness; where L1 is Figure 4 the length of the first opening along the X direction in Figure 4 and L2 is

[0039] To further improve the light-emitting brightness of the large-angle light in the first display area 21, in combination with Figure 5 shown, it should be noted that Figure 5 Figure (a) in Figure 5 is the optical path view of the first sub-refractive photon structure 31 and the first light-emitting element 41, Figure 5 Figure (b) in Figure 5 is the optical path view of the third sub-refractive photon structure 51 and the second light-emitting element 42. For the convenience of optical path comparison, Figure 4As shown in the figure. When the minimum distance between the first light-emitting element 41 and the first sub-refractive structure 31 is D1, there is a light ray within the viewing angle range α1 that is refracted at the interface of the first sub-refractive structure 31; when the minimum distance between the second light-emitting element 42 and the third sub-refractive structure 51 is D2, there is a light ray within the viewing angle range α2 that is refracted at the interface of the third sub-refractive structure 51, and α1 > α2. Thus, by setting the minimum distance D1 between the first light-emitting element 41 and the first sub-refractive structure 31 to be less than the minimum distance D2 between the second light-emitting element 42 and the third sub-refractive structure 51, it is possible to effectively increase the range of light rays deflected from a large viewing angle to the positive viewing angle by the first refractive structure 30 for the first display area 21, improve the light-emitting brightness of the first light-emitting element 41 within the first display area 21. Under the condition of the same luminous efficiency, the driving current of the first display area 21 can be reduced, the service life of the first light-emitting element 41 can be extended, the risk of burn-in damage to the first display area 21 can be reduced, and the visual imaging effect of the display panel can be stabilized.

[0040] It should be noted that the display panel 200 further includes other structures, such as a driving circuit. Multiple structures work together to achieve image display of the display panel, and they will not be listed one by one here.

[0041] In summary, for the display panel provided by the embodiment of the present invention, by adding a first refractive structure above the first light-emitting element in the first display area and adding a second refractive structure above the second light-emitting element in the second display area, using the refraction principle, the first refractive structure deflects the large-viewing-angle light rays emitted by the first light-emitting element towards the positive viewing angle, and the second refractive structure deflects the large-viewing-angle light rays emitted by the second light-emitting element towards the positive viewing angle, thereby improving the overall light-emitting brightness of the display panel; further, setting the minimum distance between the first light-emitting element and the first sub-refractive structure of the first refractive structure to be D1, and the minimum distance between the second light-emitting element and the third sub-refractive structure of the second refractive structure to be D2, where D1 < D2, enables more-viewing-angle light rays in the first display area to be deflected towards the positive viewing angle at the interface of the first sub-refractive structure and the second sub-refractive structure, thereby further improving the light-emitting brightness of the first display area, satisfying the requirement that the light emission of the first display area and the second display area is uniform under the setting of a relatively small driving current, thereby playing a role in extending the luminous life of the first light-emitting element in the first display area, reducing the risk of burn-in damage to the first display area due to excessive current, and stabilizing the visual imaging effect of the display panel.

[0042] Based on the above embodiments, the following will explain how to make the minimum distance between the first light-emitting element and the first sub-refractive structure less than the minimum distance between the second light-emitting element and the third sub-refractive structure.

[0043] Figure 6 is a schematic structural diagram of another display panel provided by an embodiment of the present invention; Figure 7 is a schematic structural diagram of another display panel provided by an embodiment of the present invention. CombiningFigure 6 and Figure 7 As shown in Figure 7 , optionally, the size of the first opening is the same as that of the second opening; the size of the first light-emitting element is larger than that of the second light-emitting element.

[0044] Exemplarily, as shown in Figure 6 Figure 6 , the first sub-refractive structure 31 and the third sub-refractive structure 51 can be etched and prepared using the same mask plate, so that the size of the first opening K1 of the first sub-refractive structure 31 is the same as that of the second opening K2 of the third sub-refractive structure 51. By setting the size of the first light-emitting element 41 in the first display area 21 to be larger than that of the second light-emitting element 42 in the second display area, it can ensure that the minimum distance D1 between the first light-emitting element 41 and the first sub-refractive structure 31 is less than the minimum distance D2 between the second light-emitting element 42 and the third sub-refractive structure 51, increasing the refraction of the large-angle light rays in the first display area 21 by the first refractive structure 30 and improving the light-emitting brightness of the first light-emitting element 41 in the front view angle; it can also reduce the production cost of the mask plate and the manufacturing process of the first opening K1 and the second opening K2.

[0045] Combined with Figure 6 and Figure 7 As shown in Figure 7 , as a feasible implementation manner, the display panel 200 includes a first pixel circuit 44 for driving the first light-emitting element 41 to emit light; the first pixel circuit 44 is disposed outside the first display area 21 (not shown in the figure), and / or, the same first pixel circuit 44 drives at least two first light-emitting elements 41 to emit light simultaneously.

[0046] Exemplarily, combined with Figure 6 and Figure 7 As shown in Figure 7 , the display panel 200 includes a first pixel circuit 44, and the first pixel circuit 44 is electrically connected to the first light-emitting element 41 for driving the first light-emitting element 41 to emit light. The first pixel circuit 44 can be disposed between the first display area 21 and the second display area 22, as shown in Figure 6 Figure 6 ; or, the first pixel circuit 44 drives at least two first light-emitting elements 41 to emit light simultaneously, as shown in Figure 7 Figure 7 , so as to reduce the occlusion of the emitted light rays of the first light-emitting element 41 by the first pixel circuit 44, increase the transmittance of the first display area 21, and improve the light-transmitting function of the display panel.

[0047] It can be understood that the display panel 200 further includes a second pixel circuit 45, and the second pixel circuit 45 is electrically connected to the second light-emitting element 42 for driving the second light-emitting element 42 to emit light.

[0048] As a feasible implementation manner, continue to refer to Figure 3As shown, the size of the first light-emitting element 41 is the same as that of the second light-emitting element 42; the size of the first opening K1 is smaller than that of the second display opening K2.

[0049] Exemplarily, as Figure 3 shown, when the size of the first light-emitting element 41 in the first display area 21 is the same as that of the second light-emitting element 42 in the second display area, the difficulty of preparing the display panel film layer can be reduced, the luminous brightness of the first light-emitting element 41 and the second light-emitting element 42 can be ensured to be uniform, and the overall luminous uniformity of the display panel can be improved; controlling the size of the first opening K1 of the first sub-refractive structure 31 to be smaller than the size of the second display opening K2 of the third sub-refractive structure 51, ensuring that the minimum distance D1 between the first light-emitting element 41 and the first sub-refractive structure 31 is less than the minimum distance D2 between the second light-emitting element 42 and the third sub-refractive structure 51, increasing the deflection of the large-angle light rays in the first display area 21 by the first refractive structure 30, and improving the light-emitting brightness of the first light-emitting element 41 in the front view.

[0050] Figure 8 is a schematic structural diagram of another display panel provided by an embodiment of the present invention. As a feasible implementation manner, as Figure 8 shown, the size of the first light-emitting element 41 is smaller than that of the second light-emitting element 42; the size of the first opening K1 is smaller than that of the second opening K2.

[0051] Exemplarily, as Figure 8 shown, setting the size of the first light-emitting element 41 in the first display area 21 to be smaller than that of the second light-emitting element 42 in the second display area can increase the light-transmitting area of the first display area 21 and improve the light-transmitting function of the display panel; controlling the size of the first opening K1 of the first sub-refractive structure 31 to be smaller than the size of the second display opening K2 of the third sub-refractive structure, ensuring that the minimum distance D1 between the first light-emitting element 41 and the first sub-refractive structure 31 is less than the minimum distance D2 between the second light-emitting element 42 and the third sub-refractive structure 51, further increasing the deflection of the large-angle light rays in the first display area 21 by the first refractive structure 30, and improving the light-emitting brightness of the first light-emitting element 41 in the front view.

[0052] As a feasible implementation manner, continue to refer to Figure 4 shown, optionally, the refractive index difference between the second sub-refractive structure 32 and the first sub-refractive structure 31 is n1, and the refractive index of the fourth sub-refractive structure 52 and the third sub-refractive structure 51 is n2, where n1 > n2.

[0053] Exemplarily, according to the principle of light refraction, when light enters a medium with a larger refractive index from a medium with a smaller refractive index, the greater the difference in refractive index between two adjacent media, the more obvious the deflection of the light. By setting the refractive index difference n1 between the refractive index of the second sub-refractive structure 32 and the refractive index of the first sub-refractive structure 31 to be greater than the refractive index n2 of the fourth sub-refractive structure 52 and the refractive index of the third sub-refractive structure 51, in order to increase the deflection degree of the light S1 in the first display area 21 towards the positive X direction, the positive viewing angle light emission brightness of the first light-emitting unit 41 can be further improved, so that the first light-emitting element 41 can have uniform light emission in the first display area 21 and the second display area 22 under the setting of a smaller driving current, thereby prolonging the light-emitting life of the first light-emitting element 41 and reducing the risk of burn-in damage in the first display area 21.

[0054] Figure 9 is a schematic diagram of the light range of another light-emitting element provided by an embodiment of the present invention; Figure 10 is a schematic diagram of the light range of another light-emitting element provided by an embodiment of the present invention; Figure 11 is a schematic diagram of the light range of another light-emitting element provided by an embodiment of the present invention; Figure 12 is a schematic diagram of the light range of another light-emitting element provided by an embodiment of the present invention; Figure 13 is a schematic diagram of the light range of another light-emitting element provided by an embodiment of the present invention. It should be noted that, Figures 9 - 13 in the (a) figure is the optical path view of the first sub-refractive structure 31 and the first light-emitting element 41, Figure 9 — Figure 13 in the (b) figure is the optical path view of the third sub-refractive structure 51 and the second light-emitting element 42. For the convenience of optical path comparison, Figures 9 - 13 in the (c) figure is the overlapping setting of the first sub-refractive structure 31 and the third refractive structure 51, and the light emitted from the same light-emitting element is used as a reference for explanation.

[0055] As a feasible implementation manner, in combination with Figure 4 、 Figures 9 - 13 shown, optionally, the first sub-refractive structure 31 includes a first surface M1 on the side close to the first light-emitting element 41 and a second surface M2 on the side far from the first light-emitting element 41; along the first direction (as shown by the X direction in the figure), the minimum distance D1 between the first surface M1 and the first light-emitting element 41 is less than the minimum distance D3 between the second surface M2 and the first light-emitting element 41, as shown in Figures 9 - 13 in the (a) figure; the third sub-refractive structure 51 includes a third surface M3 on the side close to the second light-emitting element 42 and a fourth surface M4 on the side far from the second light-emitting element 42. Along the first direction, the minimum distance D2 between the third surface M3 and the second light-emitting element 42 is less than the minimum distance D4 between the fourth surface M4 and the second light-emitting element 42, as shown inFigures 9 - 13 as shown in Figure (b).

[0056] Specifically, as shown in combination with Figure 4 and Figures 9 - 16 , along the X direction shown in the figure, by setting the minimum distance D1 between the first surface M1 of the first sub-refractive structure 31 and the first light-emitting element 41 to be less than the minimum distance D3 between the second surface M2 and the first light-emitting element 41; the minimum distance D2 between the third surface M3 of the third sub-refractive structure 51 and the second light-emitting element 42 is less than the minimum distance D4 between the fourth surface M4 and the second light-emitting element 42, where D3 and D4 can be equal or unequal. The contact surface for the light rays of the first sub-refractive structure 31 facing the first light-emitting element 41 to refract includes an inclined surface (as shown in Figure (a) of Figure 9 and Figure 12 ), a curved surface (as shown in Figure (a) of Figure 10 and Figure 11 and Figure 13 ), either one of them, so as to increase the contact surface for the light rays of the first sub-refractive structure 31 facing the first light-emitting element 41 to refract, and satisfy that the light rays with a large viewing angle range of α1 emitted by the first light-emitting element 41 are deflected towards the positive viewing angle; at the same time, the contact surface for the light rays of the third sub-refractive structure 51 facing the second light-emitting element 42 to refract includes an inclined surface (as shown in Figure (b) of Figure 9 and Figure 12 ), a curved surface (as shown in Figure (b) of Figure 10 and Figure 11 and Figure 13 ), either one of them, so as to increase the contact surface for the light rays of the third sub-refractive structure 51 facing the second light-emitting element 42 to refract, and satisfy that the light rays with a large viewing angle range of α2 emitted by the second light-emitting element 42 are deflected towards the positive viewing angle, and finally improve the positive viewing angle light emission brightness of the first display area 21 and the second display area 22.

[0057] Figure 14 is a schematic diagram of the light ray range of another light-emitting element provided by an embodiment of the present invention; Figure 15 is a schematic diagram of the light ray range of another light-emitting element provided by an embodiment of the present invention; Figure 16 is a schematic diagram of the light ray range of another light-emitting element provided by an embodiment of the present invention. It should be noted that Figures 14 - 16 Figure (a) in is the optical path view of the first sub-refractive structure 31 and the first light-emitting element 41, Figures 14 - 16 Figure (b) in is the optical path view of the third sub-refractive structure 51 and the second light-emitting element 42. For the convenience of optical path comparison, Figures 14 - 16 Figure (c) in is the overlapping setting of the first sub-refractive structure 31 and the third refractive structure 51, and the light rays emitted by the same light-emitting element are used as a reference for explanation.

[0058] As a feasible implementation, in combination with Figure 4 and Figures 14 - 16 As shown, along the thickness direction of the display panel (as shown by the Z direction in the figure), the distance h1 between the first surface M1 and the second surface M2 is the same as the distance h2 between the third surface M3 and the fourth surface M4; the first sub-refractive structure 31 further includes a first side surface N1 connecting the first surface M1 and the second surface M2, and the third sub-refractive structure 51 further includes a second side surface N2 connecting the third surface M3 and the fourth surface M4; there is a first position (point a) on the first side surface N1, and there is a second position (point b) on the second side surface N2, and the first position (point a) and the second position (point b) have the same projection position on the plane where the substrate 60 is located; the first position (point a) is located on the side closer to the substrate than the second position (point b).

[0059] Specifically, in combination with Figure 4 and Figures 14 - 16 As shown, along the Z direction shown in the figure, the distance h1 between the first surface M1 and the second surface M2 is set to be the same as the distance h2 between the third surface M3 and the fourth surface M4, that is, the first sub-refractive structure 31 and the third refractive structure 51 are arranged on the same layer and at the same height.

[0060] The first sub-refractive structure 31 further includes a first side surface N1 connecting the first surface M1 and the second surface M2 and facing the first light-emitting element 41, and the third sub-refractive structure 51 further includes a second side surface N2 connecting the third surface M3 and the fourth surface M4 and facing the first light-emitting element 41.

[0061] As a feasible implementation, as Figure 14 shown, along the X direction shown in the figure, the minimum distance D3 between the second surface M2 and the first light-emitting element 41 is set to be equal to the minimum distance D4 between the fourth surface M4 and the second light-emitting element 42, in combination with Figure 14 as shown in figure (c) of Figure 14 ; along the Z direction shown in the figure, the first side surface N1 has a first projection on the plane where the substrate is located, and the second side surface N2 has a second projection on the plane where the substrate 60 is located; along the X direction shown in the figure, the length p1 of the first projection is greater than the length p2 of the second projection, in combination with

[0062] as shown in figure (c) of Figure 15 shown, that is, the difference between the length p1 of the first projection and the length P2 of the second projection is equal to the difference between the minimum distance D2 between the second light-emitting element 42 and the third sub-refractive structure 51 and the minimum distance D1 between the first light-emitting element 41 and the first sub-refractive structure 31.

[0062] As a feasible implementation, as Figure 15 shown, along the X direction shown in the figure, the minimum distance D3 between the second surface M2 and the first light-emitting element 41 is set to be greater than the minimum distance D4 between the fourth surface M4 and the second light-emitting element 42, in combination withFigure 15 As shown in Fig. (c); as shown in the Z direction in the figure, the first side surface N1 has a first projection on the plane where the substrate is located, and the second side surface N2 has a second projection on the plane where the substrate is located; as shown in the X direction in the figure, the length p1 of the first projection is greater than the length p2 of the second projection. Combining Figure 14 as shown in Fig. (c).

[0063] As a feasible implementation manner, as Figure 16 shown, as shown in the X direction in the figure, the minimum distance D3 between the second surface M2 and the first light-emitting element 41 is set to be less than the minimum distance D4 between the fourth surface M4 and the second light-emitting element 42. Combining Figure 16 as shown in Fig. (c); as shown in the Z direction in the figure, the first side surface N1 has a first projection on the plane where the substrate is located, and the second side surface N2 has a second projection on the plane where the substrate is located; as shown in the X direction in the figure, the length p1 of the first projection and the length p2 of the second projection may be equal or unequal. Combining Figure 16 as shown in Fig. (c).

[0064] Combining Figures 14 - 16 as shown, in the Z direction in the figure, there is a first position (point a) in the first side surface N1. Combining Figures 14 - 16 as shown in Fig. (a) in Figures 14 - 16 there is a second position (point b) in the second side surface N2. Combining Figures 14 - 16 as shown in Fig. (b) in Figure 4 the first position (point a) and the second position (point b) have the same projection position on the plane where the substrate 60 is located. Combining Figures 14 - 16 as shown in Fig. (c) in

[0065] Combining Figures 14 - 16 as shown, taking the light ray S3 at the same viewing angle emitted by the first light-emitting element 41 and the second light-emitting element 42 as an example, the light ray S3 emitted by the first light-emitting element 41 first reaches point a on the first side surface N1 of the first sub-refractive structure 31 and is refracted to form a light ray S3' for emission. Combining Figures 14 - 16 as shown in Fig. (a) in Figures 14 - 16as shown in FIG. (b); along the positive X-axis direction, the light ray S3' is closer to the positive viewing angle light ray S0 of the light-emitting element than the light ray S3", combined with Figures 14 - 16 as shown in FIG. (c); thus, at the same light ray viewing angle position, by setting the distance between at least a part of the first side surface N1 and the substrate to be less than the distance between the second side surface N2 and the substrate, the light rays of the same viewing angle respectively emitted by the first light-emitting element 41 and the second light-emitting element 42 can be made such that the light ray emitted by the first light-emitting element 41 is preferentially deflected towards the positive viewing angle by the first light-refracting structure 30, which can further improve the degree of deflection of the large viewing angle light rays of the first light-emitting element 41 in the first display area 21 towards the positive viewing angle light rays, improve the light-emitting brightness of the positive viewing angle of the first display area 21, so that the first light-emitting element 41 can have uniform light emission in the first display area 21 and the second display area 22 under the setting of a smaller driving current, thereby prolonging the light-emitting life of the first light-emitting element 41 and reducing the risk of burn-in damage to the first display area 21.

[0066] Figure 17 is a schematic structural diagram of another display panel provided by an embodiment of the present invention; Figure 18 is an interface schematic diagram of a display panel along the CC' direction as shown in FIG. 10. As a feasible embodiment, combined with Figure 17 and Figure 18 , the display panel 200 further includes a transition area 23 located between the first display area 21 and the second display area 22; the transition area 23 includes a third light-emitting element 43 and a third light-refracting structure 70 located on the light-emitting side of the third light-emitting element 43, the third light-refracting structure 70 includes a fifth sub-light-refracting structure 71 and a sixth sub-light-refracting structure 72, the sixth sub-light-refracting structure 72 is located on the side of the fifth sub-light-refracting structure 72 away from the third light-emitting element 43, and the refractive index of the sixth sub-light-refracting structure 72 is greater than the refractive index of the fifth sub-light-refracting structure 71; the fifth sub-light-refracting structure 71 includes a third opening K3, along the thickness direction of the display panel (as shown by the Z direction in the figure), the third opening K3 covers the third light-emitting element 43; along the first direction (as shown by the X direction in the figure), the minimum distance between the third light-emitting element 43 and the fifth sub-light-refracting structure 71 is D3; wherein, D1 < D3 < D2.

[0067] Specifically, as Figure 17As shown, there is usually a transition region 23 between the first display region 21 and the second display region 22. The transition region 23 includes a third light-emitting element 43. The size of the third light-emitting element 43 may be equal to or different from that of the first light-emitting element 41 and the second light-emitting element 42. A third refractive structure 70 is added on the light-emitting side of the third light-emitting element 43. The third refractive structure 70 includes a fifth sub-refractive structure 71 and a sixth sub-refractive structure 72, and the refractive index of the sixth sub-refractive structure 72 is greater than that of the fifth sub-refractive structure 71. The light S4 emitted by the third light-emitting element 43 is deflected towards the front view angle successively through the fifth sub-refractive structure 71 and the sixth sub-refractive structure 72. The third opening K3 of the fifth sub-refractive structure 71 is set to cover the third light-emitting element 43; the minimum distance D3 between the third light-emitting element 43 and the fifth sub-refractive structure 71 in the X direction shown in the figure satisfies D1 < D3 < D2, so that the deflection of the large-view-angle light of the first light-emitting element 41 by the first refractive structure 30, the deflection of the large-view-angle light of the second light-emitting element 42 by the second refractive structure 50, and the deflection of the large-view-angle light of the first light-emitting element 41 by the third refractive structure 30 are evenly transitioned. Finally, the light rays emitted by the first light-emitting element 41, the second light-emitting element 42, and the third light-emitting element 43 are imaged evenly, improving the visual imaging effect of the display panel.

[0068] Among them, the refractive index of the fifth sub-refractive structure 71 may be the same as or different from that of the first sub-refractive structure 31 and the third sub-refractive structure 51, and the refractive index of the sixth sub-refractive structure 72 may be the same as or different from that of the second sub-refractive structure 32 and the fourth sub-refractive structure 52.

[0069] Figure 19 Yes Figure 3 Another cross-sectional structure schematic diagram of the display panel along the BB' direction. As a feasible embodiment, as Figure 19 shown, the display panel 200 further includes a color filter layer 90 located on the side of the refractive structure 80 away from the substrate 60. The refractive structure 80 includes a first refractive structure 30 and a second refractive structure 50.

[0070] Exemplarily, in combination with Figure 19As shown, the display panel 200 further includes a color filter layer 90 located on the side of the refractive structure 80 away from the substrate 60 and a light shielding structure 91 located between the color filter layers 90. The color filter layer 90 can transmit light of a specified wavelength. The refractive structure 80 includes a first refractive structure 30 and a second refractive structure 50. According to the light-emitting elements including red light-emitting elements, green light-emitting elements, and blue light-emitting elements, the color filter layers 90 are arranged in one-to-one correspondence with the light-emitting elements. By setting the color filter layer 90 to correspond to the emission color of the light-emitting element, the emitted light of only its corresponding light-emitting element can be transmitted. By adding the color filter layer 90, on the one hand, the light extraction purity of the light-emitting element can be improved, and the imaging effect of the display panel can be improved; on the other hand, the color filter layer 90 can also be called a color resist, which can block light of other colors from the outside from entering the display panel, playing an antireflection role and increasing the display contrast of the display panel; on the further hand, using the color filter layer 90 with a thinner film layer to replace the polarizer can improve the bending characteristics of the display panel and can be applied to flexible display panels.

[0071] Based on the same inventive concept, an embodiment of the present invention further provides a display device. Figure 20 The following is a schematic structural diagram of a display device provided by an embodiment of the present invention. As Figure 20 shown, the display device 300 includes the display panel 200 described in any embodiment of the present invention. Therefore, the display device 300 provided by the embodiment of the present invention has the technical effects of the technical solutions in any of the above embodiments, and the same or corresponding structures and explanations of terms as those in the above embodiments will not be described in detail here. The display device 300 provided by the embodiment of the present invention can be Figure 20 the mobile phone shown in the figure, or any electronic product with a display function, including but not limited to the following categories: television sets, laptop computers, desktop monitors, tablet computers, digital cameras, smart bracelets, smart glasses, in-vehicle displays, medical devices, industrial control devices, touch interaction terminals, etc. The embodiment of the present invention does not make special limitations on this.

[0072] Note that the above is only a preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the inventive concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A display panel, characterized in that, It includes a first display area and a second display area, and the second display area surrounds at least part of the first display area; The display panel further includes a first light-emitting element located in the first display area and a first refractive structure located on the light-emitting side of the first light-emitting element. The first refractive structure includes a first sub-refractive structure and a second sub-refractive structure. The second sub-refractive structure covers the first sub-refractive structure, and the refractive index of the second sub-refractive structure is greater than that of the first sub-refractive structure; the first sub-refractive structure includes a first opening, and along the thickness direction of the display panel, the first opening covers the first light-emitting element; Along a first direction, the minimum distance between the first light-emitting element and the first sub-refractive structure is D1; the first direction is parallel to the plane where the substrate of the display panel is located; The display panel further includes a second light-emitting element located in the second display area and a second refractive structure located on the light-emitting side of the second light-emitting element. The second refractive structure includes a third sub-refractive structure and a fourth sub-refractive structure. The fourth sub-refractive structure covers the third sub-refractive structure, and the refractive index of the fourth sub-refractive structure is greater than that of the third sub-refractive structure; the third sub-refractive structure includes a second opening, and along the thickness direction of the display panel, the second opening covers the second light-emitting element; along the first direction, the minimum distance between the second light-emitting element and the third sub-refractive structure is D2; wherein, D1 < D2; The first sub-refractive structure includes a first surface on the side close to the first light-emitting element and a second surface on the side far from the first light-emitting element; along the first direction, the minimum distance between the first surface and the first light-emitting element is less than the minimum distance between the second surface and the first light-emitting element; The third sub-refractive structure includes a third surface on the side close to the second light-emitting element and a fourth surface on the side far from the second light-emitting element; along the first direction, the minimum distance between the third surface and the second light-emitting element is less than the minimum distance between the fourth surface and the second light-emitting element; Along the thickness direction of the display panel, the distance between the first surface and the second surface is the same as the distance between the third surface and the fourth surface; The first sub-refractive structure further includes a first side surface connecting the first surface and the second surface, and the third sub-refractive structure further includes a second side surface connecting the third surface and the fourth surface; at the same light viewing angle position, at least part of the distance of the first side surface from the substrate is less than the distance of the second side surface from the substrate; among the light rays emitted from the first light-emitting element and the second light-emitting element at the same viewing angle, the light rays emitted from the first light-emitting element are preferentially deflected towards the positive viewing angle by the first refractive structure compared to the light rays emitted from the second light-emitting element.

2. The display panel according to claim 1, wherein The size of the first opening is the same as the size of the second opening; The size of the first light-emitting element is larger than the size of the second light-emitting element.

3. The display panel according to claim 2, wherein The display panel includes a first pixel circuit for driving the first light-emitting element to emit light; The first pixel circuit is disposed outside the first display area, and / or, the same first pixel circuit drives at least two of the first light-emitting elements to emit light simultaneously.

4. The display panel according to claim 1, wherein The size of the first light-emitting element is the same as the size of the second light-emitting element; The size of the first opening is smaller than the size of the second opening.

5. The display panel according to claim 1, characterized in that The size of the first light-emitting element is smaller than the size of the second light-emitting element; The size of the first opening is smaller than the size of the second opening.

6. The display panel according to claim 1, wherein The difference in refractive index between the second sub-refractive structure and the first sub-refractive structure is n1, and the refractive index of the fourth sub-refractive structure and the refractive index of the third sub-refractive structure is n2, where n1 > n2.

7. The display panel according to claim 1, wherein The display panel further includes a transition area located between the first display area and the second display area; The transition area includes a third light-emitting element and a third refractive structure on the light-emitting side of the third light-emitting element. The third refractive structure includes a fifth sub-refractive structure and a sixth sub-refractive structure. The sixth sub-refractive structure is located on the side of the fifth sub-refractive structure away from the third light-emitting element, and the refractive index of the sixth sub-refractive structure is greater than the refractive index of the fifth sub-refractive structure; the fifth sub-refractive structure includes a third opening, and along the thickness direction of the display panel, the third opening covers the third light-emitting element; along the first direction, the minimum distance between the third light-emitting element and the fifth sub-refractive structure is D3; where D1 < D3 < D2.

8. The display panel according to claim 1, wherein, The display panel further includes a color filter layer on the side of the refractive structure away from the substrate, and the refractive structure includes the first refractive structure and the second refractive structure.

9. A display device, characterized in that, Including the display panel according to any one of claims 1-8.

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