Display panel

Abstract

The application belongs to the technical field of semiconductor devices, and particularly relates to a display panel, which comprises a pixel definition layer, a light-emitting unit and a plurality of first microlenses. The pixel definition layer comprises a plurality of dams and a plurality of openings, and the dams and the openings are arranged alternately. The light-emitting unit is located in the openings of the pixel definition layer. The first microlenses are located on the side of the pixel definition layer facing a light-emitting surface of the display panel. The orthographic projection of the first microlenses on the pixel definition layer is located in the dams and is adjacent to the openings. The first microlenses are used for guiding the light from the light-emitting unit to the light-emitting surface. The display panel of the application can improve the light-emitting efficiency of the display panel.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of semiconductor devices, and particularly relates to a display panel. BACKGROUND

[0002] With the rapid development of display technology, display panels are widely used in mobile phones, tablet computers and various display products. Among them, flexible organic light emitting diodes (OLED) are widely used in the display field due to their excellent light emitting performance, high contrast, wide viewing angle and extremely low power consumption. However, the light extraction efficiency of the display panel in the prior art is low. SUMMARY

[0003] Therefore, the present application mainly solves the technical problem of providing a display panel capable of improving the light extraction efficiency of the display panel.

[0004] To solve the above technical problems, one technical solution adopted by the present application is: a display panel, comprising a pixel definition layer, a light emitting unit and a plurality of first microlenses, the pixel definition layer comprises a plurality of dams and a plurality of openings, the dams and the openings are arranged alternately; the light emitting unit is located in the opening of the pixel definition layer; the first microlens is located on the side of the pixel definition layer facing the light emitting surface of the display panel, the orthographic projection of the first microlens on the pixel definition layer is located in the dam and is adjacent to the opening, and the first microlens is used to guide the light from the light emitting unit to emit from the side of the light emitting surface.

[0005] The display panel sets the first microlens, so that the light emitted by the light emitting unit and reaching the first microlens is totally reflected by the first microlens, and the light is emitted from the side of the light emitting surface of the display panel, thereby improving the light extraction efficiency. The orthographic projection of the first microlens on the pixel definition layer is adjacent to the opening in the present application, so that the amount of light emitted by the light emitting unit and totally reflected by the first microlens increases, and the first microlens is used to guide the light from the light emitting unit to emit from the side of the light emitting surface, thereby improving the light extraction efficiency of the display panel.

[0006] Among them, the display panel further comprises a second microlens, a part of the second microlens is embedded between two adjacent first microlenses, and the orthographic projection on the pixel definition layer covers the light emitting unit; another part of the second microlens covers the side of the first microlens facing the light emitting surface; and the refractive index of the second microlens is greater than that of the first microlens. By setting the second microlens, the light path of the display panel can be increased, and the light extraction effect can be improved. At the same time, the interface reflection loss can be reduced, and the light extraction efficiency can be improved.

[0007] The display panel further includes a third microlens, the third microlens is located on the side of the first microlens facing the light-emitting surface, and the third microlens at least partially covers the side of the first microlens close to the light-emitting unit; the refractive index of the third microlens is greater than the refractive index of the first microlens and less than the refractive index of the second microlens. By adding the third microlens, the interface reflection loss can be reduced, the reflection loss can be reduced, and the light-emitting efficiency can be improved.

[0008] The first side of the side surface adjacent to the light-emitting unit close to the first edge of the pixel definition layer is overlapped with the projection of the opening edge on the pixel definition layer; and the second side of the side surface away from the pixel definition layer is located in the dam. The light emitted by the light-emitting unit is reflected on the side surface of the first microlens, and the reflected light is located in the normal viewing angle range of the display panel.

[0009] As a technical solution of the present application, the display panel further includes an encapsulation layer for encapsulating the pixel definition layer and the light-emitting unit; and the first microlens is located on the side of the encapsulation layer facing the light-emitting surface. The first microlens can be arranged outside the encapsulation layer without changing the manufacturing process of the original light-emitting layer and the encapsulation layer.

[0010] The first included angle between the side surface and the plane where the pixel definition layer is located is related to the width of the opening, the thickness of the encapsulation layer, and the thickness of the first microlens. In the embodiments of the present application, the size of the first included angle is determined in relation to the width of the opening of the pixel definition layer and the thickness of the encapsulation layer and the thickness of the first microlens. By determining the influencing factors, the size of the first included angle between the side surface close to the light-emitting unit of the first microlens and the plane where the pixel definition layer is located is controlled, so that the light emitted by the light-emitting unit is totally reflected on the side surface of the first microlens, and the emitted light after total reflection is located in the normal viewing angle range of the display panel. The light-emitting efficiency of the display panel in the normal viewing angle can be improved, and the light-emitting efficiency of the display panel in the side viewing angle can be reduced.

[0011] The second included angle between the tangent plane of the side surface at the midpoint position along the thickness direction and the plane where the pixel definition layer is located is related to the width of the opening, the thickness of the encapsulation layer, and the thickness of the first microlens. By determining the influencing factors, the size of the second included angle is controlled, so that the light-emitting efficiency of the display panel in the normal viewing angle can be improved, and the light-emitting efficiency of the display panel in the side viewing angle can be reduced.

[0012] The range of the first included angle or the second included angle satisfies the following formula:

[0013]

[0014] a is the first included angle or the second included angle, h1 is the width of the opening, h2 is the thickness of the encapsulation layer, and h3 is the thickness of the first microlens. The first included angle and the second included angle are calculated by the above formula, the inclination of the side surface of the first microlens is determined, and the light emission efficiency of the front view angle of the display panel is improved.

[0015] As another technical solution of the present application, the display panel further comprises an encapsulation layer for encapsulating the pixel definition layer and the light emitting unit; and the first microlens is located between the encapsulation layer and the pixel definition layer. The first microlens is arranged on the side of the encapsulation layer close to the light emitting unit, that is, the first microlens is arranged on the pixel definition layer before the encapsulation layer is manufactured.

[0016] The side surface is a plane, and the first included angle between the side surface and the plane where the pixel definition layer is located is related to the width of the opening and the thickness of the first microlens. The size of the first included angle is determined according to the width of the opening of the pixel definition layer and the thickness of the first microlens, and the influencing factors are determined to control the size of the first included angle between the side surface of the first microlens close to the light emitting unit and the plane where the pixel definition layer is located. The light emitted by the light emitting unit is totally reflected through the side surface of the first microlens, and the emergent light after the total reflection is located in the front view angle of the display panel, the light emission amount of the front view angle of the display panel can be improved, and the light emission amount of the side view angle can be reduced, so as to improve the light emission efficiency of the front view angle of the display panel.

[0017] The side surface is an arc surface, and the second included angle between the tangent plane of the midpoint position of the side surface along the thickness direction and the plane where the pixel definition layer is located is related to the width of the opening and the thickness of the first microlens. The size of the second included angle is determined to control the size of the second included angle, so that the light emitted by the light emitting unit is totally reflected through the side surface of the first microlens, and the emergent light after the total reflection is located in the front view angle of the display panel. The light emission amount of the front view angle of the display panel can be improved, and the light emission amount of the side view angle can be reduced, so as to improve the light emission efficiency of the front view angle of the display panel.

[0018] The range of the first included angle or the second included angle satisfies the following formula:

[0019]

[0020] a is the first included angle or the second included angle, h1 is the width of the opening, and h3 is the thickness of the first microlens. The range of the first included angle and the second included angle can be calculated by the above formula, so that the light emitted by the light emitting unit can reach the side surface of the first microlens and be totally reflected on the side surface of the first microlens, and the emergent light is located in the front view angle of the display panel. That is, the emergent light is perpendicular or approximately perpendicular to the light emission surface of the display panel.

[0021] The beneficial effects of the present application are: different from the prior art, the display panel of the present application is provided with the first microlens, so that the light emitted by the light emitting unit and reaching the first microlens is totally reflected by the first microlens, and the light is emitted from the light emitting surface side of the display panel, thereby improving the light emitting efficiency. The first microlens in the present application is adjacent to the opening in the orthographic projection on the pixel definition layer, so that the amount of light emitted by the light emitting unit and totally reflected by the first microlens is increased, and the first microlens is used to guide the light from the light emitting unit to the light emitting surface side, thereby improving the light emitting efficiency of the display panel. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a cross-sectional structure schematic diagram of the first embodiment of the display panel of the present application;

[0023] Figure 2 is a cross-sectional structure schematic diagram of the second embodiment of the display panel of the present application;

[0024] Figure 3 is a partial enlarged schematic diagram of Figure 2 ;

[0025] Figure 4 is a cross-sectional structure schematic diagram of the third embodiment of the display panel of the present application;

[0026] Figure 5 is a cross-sectional structure schematic diagram of the fourth embodiment of the display panel of the present application;

[0027] Figure 6 is a cross-sectional structure schematic diagram of the fifth embodiment of the display panel of the present application;

[0028] Figure 7 is a cross-sectional structure schematic diagram of the sixth embodiment of the display panel of the present application;

[0029] Figure 8 is a cross-sectional structure schematic diagram of the seventh embodiment of the display panel of the present application;

[0030] Figure 9 is a cross-sectional structure schematic diagram of the eighth embodiment of the display panel of the present application;

[0031] Figure 10 is a cross-sectional structure schematic diagram of the ninth embodiment of the display panel of the present application;

[0032] Figure 11 is a cross-sectional structure schematic diagram of the tenth embodiment of the display panel of the present application. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application.

[0034] Through long-term research, the inventors discovered that due to the surface plasmon polarity of the metal cathode or organic layer interface and the influence of internal anode reflection, most of the emitted light in the display panel is confined inside the device rather than being coupled out, resulting in low light emission efficiency of the display panel.

[0035] like Figure 1 As shown, this application embodiment provides a display panel including a pixel definition layer 100, a light-emitting unit 200, and a plurality of first microlenses 310. The pixel definition layer 100 includes a plurality of dams 110 and a plurality of openings (not shown in the figure), with the dams 110 and openings alternately arranged. The light-emitting unit 200 is located in the opening of the pixel definition layer 100. The first microlenses 310 are located on the side of the pixel definition layer 100 facing the light-emitting surface of the display panel. The orthographic projection of the first microlens 310 on the pixel definition layer 100 is adjacent to the opening, and the orthographic projection is located within the dam 110. The first microlenses 310 are used to guide the light from the light-emitting unit 200 toward the light-emitting surface.

[0036] In this embodiment, the display panel incorporates a first microlens 310, causing the light emitted from the light-emitting unit 200 to undergo total internal reflection upon reaching the first microlens 310. This allows the light to exit from the light-emitting surface of the display panel, improving its light extraction efficiency. In this embodiment, the orthographic projection of the first microlens 310 onto the pixel definition layer 100 is adjacent to the opening, and the first microlens 310 guides the light from the light-emitting unit 200 towards the light-emitting surface, increasing the amount of total internal reflection of the light emitted from the light-emitting unit 200 through the first microlens 310, thus improving the light extraction efficiency of the display panel.

[0037] It should be noted that, in this embodiment, the orthographic projection of the first microlens 310 onto the pixel definition layer 100 being adjacent to the opening means that the orthographic projection of the first microlens 310 onto the pixel definition layer 100 is adjacent to the opening and there is no gap. That is, the side of the orthographic projection of the first microlens 310 onto the pixel definition layer 100 near the opening at least partially overlaps with the side of the orthographic projection of the opening near the first microlens 310.

[0038] In this embodiment, an array substrate (not shown) is also included, comprising a substrate (not shown) and a pixel circuit array (not shown); a pixel definition layer 100 and a light-emitting unit 200 are disposed on the array substrate, the light-emitting unit 200 comprising an anode layer, an organic light-emitting layer, and a cathode layer. This application does not limit the specific structure or material of the light-emitting display layer, and it can be configured according to the display method of the display panel.

[0039] It should be noted that in the embodiments of the present application, the first microlens 310 can be made by inkjet printing or ion implantation. The thickness of the first microlens 310 is 1-3.5 microns, so that the first microlens 310 can improve the light output effect of the display panel, while the thickness of the display panel increases less, and the overall thickness of the display panel is not affected.

[0040] In the embodiments of the present application, the planarization layer 500 is coated above the first microlens 310, so that the light emitting side surface of the display panel is flat. In the embodiments of the present application, the refractive index of the planarization layer 500 is greater than the refractive index of the first microlens 310, so that part of the light emitted by the light emitting unit 200 is refracted by the first microlens 310. When the refracted light is emitted through the planarization layer 500, the light is further refracted by the planarization layer 500 and then emitted through the light emitting surface of the display panel. The light output efficiency of the display panel can be further improved, for example, Figure 1 In other embodiments, the refractive index of the planarization layer 500 can also be not greater than the refractive index of the first microlens 310, so that the light emitted by the light emitting unit 200 is totally reflected by the first microlens 310 and then emitted through the planarization layer 500.

[0041] In the embodiments of the present application, the material of the first microlens 310 is a light-transmitting material, which is beneficial for part of the light emitted by the light emitting unit 200 to be refracted and emitted through the first microlens 310. In other embodiments, the material of the first microlens 310 can also be a non-light-transmitting material.

[0042] As shown in FIG. 4, the display panel 100 includes a plurality of light emitting units 200, a plurality of first microlenses 310, and a planarization layer 500. Figure 2 and Figure 3As shown, in another embodiment of the present application, the display panel further comprises a second microlens 320, a part of the second microlens 320 is embedded between two adjacent first microlenses 310, and the orthographic projection of the second microlens 320 on the pixel definition layer 100 covers the light emitting unit 200; another part of the second microlens 320 covers the side of the first microlens 310 facing the light exit surface of the display panel; the refractive index of the second microlens 320 is greater than the refractive index of the first microlens 310. By setting the second microlens 320, the light path of the display panel can be increased, and the light exit effect can be improved. In the embodiment of the present application, the first microlens 310 and the second microlens 320 constitute a microlens structure 300. In the embodiment of the present application, the refractive index of the second microlens 320 is greater than the refractive index of the first microlens 310, and the refractive index of the second microlens 320 is less than the refractive index of the planarization layer 500, so that in the embodiment of the present application, the light emitted by the light emitting unit 200 is refracted after passing through the first microlens 310, and then enters the second microlens 320, is refracted after entering the planarization layer 500, and is emitted by the planarization layer 500. By increasing the second microlens 320, the interface reflection loss can be reduced, and the light exit efficiency can be improved. In other embodiments, the planarization layer 500 can not be provided, the refractive index of the second microlens 320 is greater than the refractive index of the first microlens 310, so that the light emitted by the light emitting unit 200 is refracted after passing through the first microlens 310, and then enters the second microlens 320, and is emitted by the second microlens 320. The interface reflection loss can be reduced, and the light exit efficiency can be improved.

[0043] Specifically, in the embodiment of the present application, the second microlens 320 is optical glue, and the performance of the optical glue of the second microlens 320 is different from the performance of the first microlens 310. The second microlens 320 in the embodiment of the present application is made by ion implantation method, and the second microlens 320 is mixed with scattering particles, and the scattering particles are inorganic powder such as zirconium oxide and silicon oxide, which is beneficial to the light emitted by the light emitting unit 200 to reach the second microlens 320 after total reflection through the first microlens 310, and to be scattered through the scattering particles in the second microlens 320, so as to improve the light exit efficiency of the display panel. In other embodiments, the second microlens 320 can also be made by inkjet printing. The second microlens 320 can not contain scattering particles.

[0044] In the embodiment of the present application, as Figure 4As shown, the display panel further comprises a third microlens 330, the third microlens 330 is located on the side of the first microlens 310 facing the light-emitting surface, and the third microlens 330 at least partially covers the side 311 of the first microlens 310 close to the light-emitting unit 200; the refractive index of the third microlens 330 is greater than the refractive index of the first microlens 310 and less than the refractive index of the second microlens 320. In the embodiment of the present application, the third microlens 330 covers the side 311 of the first microlens 310 and the top surface (not marked in the figure) of the first microlens 310 at the same time, and the top surface of the first microlens 310 is the surface of the first microlens 310 close to the light-emitting surface. In the embodiment of the present application, the first microlens 310, the second microlens 320 and the third microlens 330 constitute the microlens structure 300. In the embodiment of the present application, by arranging the third microlens 330, the light emitted by the light-emitting unit 200 reaches the side 311 of the first microlens 310 and is totally reflected, so that the light emitted by the total reflection further passes through the third microlens 330 and is refracted, and then passes through the second microlens 320 and is refracted; the light after refraction further refracts in the planarization layer 500. By increasing the third microlens 330, the interface reflection loss can be reduced, the reflection loss can be reduced, and the light-emitting efficiency can be improved. The light emitted by the light-emitting unit 200 is refracted by the first microlens 310 and emitted from the top surface of the first microlens 310, and then further refracted by the third microlens 330, the second microlens 320 and the planarization layer 500. In the embodiment of the present application, by arranging the third microlens 330, the total reflection loss of the light-emitting unit 200 in the display panel is further reduced, and the light-emitting efficiency of the display panel is improved.

[0045] In the embodiment of the present application, as shown in Figure 1 , Figure 2 and Figure 3 , the normal projection of the first edge of the side 311 of the first microlens 310 close to the pixel definition layer 100 on the pixel definition layer 100 overlaps with the opening edge; the normal projection of the second edge of the side 311 away from the pixel definition layer 100 on the pixel definition layer 100 is located in the dam 110. In the embodiment of the present application, the first edge of the first microlens 310 is a point in the cross-sectional view, specifically point A in Figure 1 ; the second edge of the second microlens 320 is a point in the cross-sectional view, specifically point B in Figure 1 . In the embodiment of the present application, the side 311 of the first microlens 310 is an inclined surface, so that the light emitted by the light-emitting unit 200 can be totally reflected by the side 311 of the first microlens 310. In the embodiment of the present application, the cross section of the first microlens 310 is trapezoidal, and the side 311 of the first microlens 310 is a plane. In other embodiments, the side 311 of the first microlens 310 can also be a structure close to a plane, or as Figure 5As shown, the side surface 311 of the first microlens 310 is an arc surface, which can be an outward convex arc surface; or as shown in Figure 6 the side surface 311 of the first microlens 310 is an inward concave arc surface.

[0046] In an embodiment of the present application, the first microlens 310 is located on the dam 110 of the pixel definition layer 100, and at least two side surfaces 311 of the first microlens 310 serve as the light guiding surface of the adjacent two light emitting units 200. That is, the first microlens 310 on the same dam 110 is an integral structure. In other embodiments, as shown in Figure 7 、 Figure 8 and Figure 9 the first microlens 310 on the same dam 110 can be more than two, and the side surface 311 of the first microlens 310 close to the light emitting unit 200 serves as the light guiding surface.

[0047] In an embodiment of the present application, as shown in Figure 1 and Figure 2 the display panel further comprises an encapsulation layer 400 for encapsulating the pixel definition layer 100 and the light emitting unit 200, and the first microlens 310 is located on the side of the encapsulation layer 400 facing the light emitting surface. In an embodiment of the present application, the encapsulation layer 400 comprises an inorganic thin film encapsulation layer and an organic thin film encapsulation layer stacked. The specific structure and material of the encapsulation layer 400 are not limited in the embodiment of the present application. In the embodiment of the present application, the first microlens 310 is arranged outside the encapsulation layer 400, that is, the encapsulation layer 400 is manufactured first, and then the first microlens 310 is further manufactured in the manufacturing process of the display panel. The material of the first microlens 310 in the embodiment of the present application is optical glue. In other embodiments, the first microlens 310 can also be other materials.

[0048] In an embodiment of the present application, the side surface 311 of the first microlens 310 adjacent to the light emitting unit 200 is a plane, and the first included angle between the side surface 311 and the plane where the pixel definition layer 100 is located is related to the width h l of the opening of the pixel definition layer 100, the thickness h2 of the encapsulation layer 400 and the thickness h3 of the first microlens 310. In the embodiment of the present application, the size of the first included angle is determined in relation to the width h l of the opening of the pixel definition layer 100, the thickness h2 of the encapsulation layer 400 and the thickness h3 of the first microlens 310, and by determining the influencing factors, the size of the first included angle between the side surface 311 of the first microlens 310 close to the light emitting unit 200 and the plane where the pixel definition layer 100 is located is controlled, so that the light emitted by the light emitting unit 200 is totally reflected after passing through the side surface 311 of the first microlens 310, and the emergent light after the total reflection is located within the normal viewing angle range of the display panel, which can improve the light output of the display panel in the normal viewing angle and reduce the light output in the side viewing angle, so as to improve the light output efficiency of the display panel in the normal viewing angle.

[0049] The width h1 of the opening is the distance of the opening from left to right in a direction perpendicular to the first edge of the first microlens 310 and parallel to the reference plane or the light-out plane of the display panel. l The width h1 of the opening is the distance of the opening from left to right in a direction perpendicular to the first edge of the first microlens 310 and parallel to the reference plane or the light-out plane of the display panel. Figure 2 The width h1 of the opening is the distance of the opening from left to right in a direction perpendicular to the first edge of the first microlens 310 and parallel to the reference plane or the light-out plane of the display panel. l The width h1 of the opening is the distance of the opening from left to right in a direction perpendicular to the first edge of the first microlens 310 and parallel to the reference plane or the light-out plane of the display panel.

[0050] The thickness h2 of the encapsulation layer 400 is the distance of the encapsulation layer 400 in a direction perpendicular to the light-out plane.

[0051] The thickness h3 of the first microlens 310 is the distance from the top surface of the first microlens 310 to the bottom surface of the first microlens 310. The top surface of the first microlens 310 is the surface of the first microlens 310 close to the light-out plane, and the bottom surface of the first microlens 310 is the surface of the first microlens 310 away from the light-out plane.

[0052] In the embodiment of the present application, the side surface 311 is an arc surface. The second angle between the tangent plane of the midpoint position of the side surface 311 in the thickness direction and the plane where the pixel definition layer 100 is located is related to the width h1 of the opening, the thickness h2 of the encapsulation layer 400, and the thickness h3 of the first microlens 310. l When the side surface 311 is an arc surface, for example, a concave arc surface or a convex arc surface. The second angle between the tangent plane of the midpoint position of the side surface 311 in the thickness direction and the plane where the pixel definition layer 100 is located is related to the width h1 of the opening of the pixel definition layer 100, the thickness h2 of the encapsulation layer 400, and the thickness h3 of the first microlens 310. By determining the influencing factors, the size of the second angle is controlled to make the light emitted by the light-emitting unit 200 totally reflected through the side surface 311 of the first microlens 310, and the emitted light after total reflection is located in the normal viewing angle of the display panel. The light-out quantity in the normal viewing angle of the display panel can be improved, the light-out quantity in the side viewing angle can be reduced, and the light-out efficiency in the normal viewing angle of the display panel can be improved.

[0053] In the embodiment of the present application, the range of the first angle or the second angle satisfies the following formula:

[0054]

[0055] α is the first included angle or the second included angle, h1 is the width of the opening, h2 is the thickness of the encapsulation layer 400, and h3 is the thickness of the first microlens 310. By controlling the range of the first included angle and the second included angle to be within the range in formula (1), the light emitted by the light emitting unit 200 can reach the side surface 311 of the first microlens 310 and undergo total reflection at the side surface 311 of the first microlens 310, and the emergent light is within the normal viewing angle of the display panel. That is, the emergent light is perpendicular or approximately perpendicular to the light exit surface of the display panel. By calculating the first included angle and the second included angle, the inclination of the side surface 311 of the first microlens 310 can be determined, so that the light exit efficiency of the normal viewing angle of the display panel is improved.

[0056] As shown in Figure 2 and Figure 3 In the embodiment of the present application, for example, in the case of the side surface 311 being a plane, the specific forming process of formula (1) is as follows:

[0057] α≈β'+θ (1.1);

[0058] α+β=90° (1.2);

[0059] β'=β (1.3);

[0060]

[0061]

[0062]

[0063]

[0064] wherein α is the first included angle or the second included angle. θ is the included angle between the light emitted by the midpoint of the light emitting unit 200 and the plane on which the pixel defining layer 100 is located. β is the included angle between the light emitted by the midpoint of the light emitting unit 200 and the side surface 311 of the first microlens 310. β' is the included angle between the light formed by total reflection of the light emitted by the midpoint of the light emitting unit 200 and the side surface 311. θ1 is the included angle between the light emitted by the farthest side of the light emitting unit 200 and the plane on which the pixel defining layer 100 is located. θ2 is the included angle between the light emitted by the light emitting unit 200 and the plane on which the pixel defining layer 100 is located, when the light emitted by the light emitting unit 200 reaches the midpoint of the side surface 311 of the first microlens 310, total reflection occurs, and the total reflection is within the normal viewing angle.

[0065] In the embodiment of the present application, the formula (1) can be derived from the formulas (1.1)-(1.7), so that the tilt angle a of the side surface 311 of the first microlens 310 in the embodiment of the present application can be obtained. In order to facilitate the manufacture of the first microlens 310 and control the tilt angle of the first microlens 310, so that the normal viewing angle light output effect of the display panel reaches the best.

[0066] In the embodiment of the present application, the light output efficiency of the blue light emitting unit under different angles of the tilt angle of the first microlens 310 is simulated and tested, wherein the test condition is that the opening of the pixel definition layer 100 is an inverted trapezoid, and the included angle between the opening side and the plane where the pixel definition layer 100 is located is 25°. In other embodiments, the included angle between the opening side and the plane where the pixel definition layer 100 is located can also be any value between 20°-35°. Under the same condition, the normal viewing angle light output efficiency of the display panel under the tilt angle (first included angle) of the first microlens 310 of 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80° and 90° is tested. The tested light output efficiency is as follows: when the tilt angle of the first microlens 310 is 10°, the normal viewing angle light output efficiency of the display panel is 3.19%. When the tilt angle of the first microlens 310 is 20°, the normal viewing angle light output efficiency of the display panel is 7.88%. When the tilt angle of the first microlens 310 is 30°, the normal viewing angle light output efficiency of the display panel is 13.61%. When the tilt angle of the first microlens 310 is 40°, the normal viewing angle light output efficiency of the display panel is 21.39%. When the tilt angle of the first microlens 310 is 50°, the normal viewing angle light output efficiency of the display panel is 29.71%. When the tilt angle of the first microlens 310 is 60°, the normal viewing angle light output efficiency of the display panel is 27.7%. When the tilt angle of the first microlens 310 is 70°, the normal viewing angle light output efficiency of the display panel is 0.95%. When the tilt angle of the first microlens 310 is 80°, the normal viewing angle light output efficiency of the display panel is 0.30%. When the tilt angle of the first microlens 310 is 90°, the normal viewing angle light output efficiency of the display panel is 0.26%. In the embodiment of the present application, it is calculated through simulation test that the normal viewing angle light output efficiency is higher when the tilt angle of the first microlens 310 is 50° and 60°. When the tilt angle of the first microlens 310 is 50°, the normal viewing angle light output efficiency can be as high as 29.71%.

[0067] In the embodiments of the present application, the light extraction efficiency of the first microlens 310 at different angles under the same tilt angle is simulated. Specifically, in the embodiments of the present application, the normal viewing angle light extraction efficiency of the display panel is simulated to be 24.75%, 28.73%, 29.71%, 29.64%, 28.81%, 27.79% and 26.20% respectively when the thickness of the first microlens 310 is 1.67 μm, 1.92 μm, 2.17 μm, 2.42 μm, 2.67 μm, 2.92 μm and 3.17 μm respectively under the condition of a 50° tilt angle of the first microlens 310. In the embodiments of the present application, the normal viewing angle light extraction efficiency increases first and then decreases with the increase of the thickness of the first microlens 310, and the light extraction efficiency of the display panel reaches the maximum when the thickness of the first microlens 310 is 2.17 μm.

[0068] In another embodiment of the present application, as shown in Figure 10 and Figure 11 , the display panel further comprises an encapsulation layer 400 for encapsulating the pixel definition layer 100 and the light emitting unit 200; in the embodiments of the present application, the first microlens 310 is located between the encapsulation layer 400 and the pixel definition layer 100. In the embodiments of the present application, the first microlens 310 is fabricated on the pixel definition layer 100 before the encapsulation layer 400 is fabricated. In the embodiments of the present application, the first microlens 310 and the second microlens 320 are both located between the encapsulation layer 400 and the pixel definition layer 100. In other embodiments, the first microlens 310, the second microlens 320 and the third microlens 330 can also be located between the encapsulation layer 400 and the pixel definition layer 100. Or the first microlens 310 and the planarization layer 500 are located between the encapsulation layer 400 and the pixel definition layer 100. In the embodiments of the present application, the planarization layer 500 is not specifically limited, and the planarization layer 500 can be not set or set. The planarization layer 500 can be located between the encapsulation layer 400 and the pixel definition layer 100, or located on the side of the encapsulation layer 400 facing the light emitting surface. In the embodiments of the present application, the encapsulation layer 400 comprises a laminated inorganic thin film encapsulation layer and an organic thin film encapsulation layer, and the encapsulation layer 400 can also be a glass cover plate. In the embodiments of the present application, the specific material of the encapsulation layer 400 is not specifically limited.

[0069] In the embodiment of the present application, the side surface 311 is a plane, and a first included angle between the side surface 311 and a plane on which the pixel definition layer 100 is located is related to a width h1 of the opening and a thickness h3 of the first microlens 310. In the embodiment of the present application, the size of the first included angle is determined in relation to the width h1 of the opening of the pixel definition layer 100 and the thickness h3 of the first microlens 310, and by determining the influencing factors, the size of the first included angle between the side surface 311 on the side close to the light emitting unit 200 of the first microlens 310 and the plane on which the pixel definition layer 100 is located is controlled, so that the light emitted by the light emitting unit 200 is totally reflected by the side surface 311 of the first microlens 310, and the emergent light after the total reflection is located in the normal viewing angle of the display panel, which can improve the light output of the normal viewing angle of the display panel, reduce the light output of the side viewing angle, and improve the light output efficiency of the normal viewing angle of the display panel.

[0070] In the embodiment of the present application, the side surface 311 is an arc surface, and a second included angle between a tangent plane of the side surface 311 at a midpoint position in the thickness direction and a plane on which the pixel definition layer 100 is located is related to a width h1 of the opening and a thickness h3 of the first microlens 310. When the side surface 311 is an arc surface, it is, for example, a concave arc surface or a convex arc surface. The second included angle between the tangent plane of the side surface 311 at the midpoint position in the thickness direction and the plane on which the pixel definition layer 100 is located is determined in relation to the width h1 of the opening of the pixel definition layer 100 and the thickness h3 of the first microlens 310, and by determining the influencing factors, the size of the second included angle is controlled, so that the light emitted by the light emitting unit 200 is totally reflected by the side surface 311 of the first microlens 310, and the emergent light after the total reflection is located in the normal viewing angle of the display panel, which can improve the light output of the normal viewing angle of the display panel, reduce the light output of the side viewing angle, and improve the light output efficiency of the normal viewing angle of the display panel.

[0071] In the embodiment of the present application, the range of the first included angle or the second included angle satisfies the following formula:

[0072]

[0073] α is the first included angle or the second included angle, h1 is the width of the opening, and h3 is the thickness of the first microlens 310.

[0074] In the embodiment of the present application, by controlling the range of the first included angle and the second included angle to be within the range in formula (2), the light emitted by the light emitting unit 200 can reach the side surface 311 of the first microlens 310 and be totally reflected by the side surface 311 of the first microlens 310, and the emergent light is located in the normal viewing angle of the display panel. That is, the emergent light is perpendicular or approximately perpendicular to the light output surface of the display panel.

[0075] The above merely describes the embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is made by using the content of the present application specification and drawings, is also included in the patent protection scope of the present application.

Claims

1. A display panel, characterized in that, include: A pixel definition layer (100) includes a plurality of dams (110) and a plurality of openings, wherein the dams (110) and the openings are alternately arranged; A light-emitting unit (200) is located in the opening of the pixel definition layer (100); Multiple first microlenses (310) are provided, the first microlenses (310) being located on the side of the pixel definition layer (100) facing the light-emitting surface of the display panel. The orthographic projection of the first microlens (310) on the pixel definition layer (100) is located within the dam (110) and adjacent to the opening. The first microlenses (310) are used to guide the light from the light-emitting unit (200) toward the light-emitting surface. A second microlens (320) is embedded between two adjacent first microlenses (310), and its orthogonal projection on the pixel definition layer (100) covers the light-emitting unit (200). The second microlens (320) contains scattering particles. A third microlens (330) is located on the side of the first microlens (310) facing the light-emitting surface, and the third microlens (330) at least partially covers the side (311) of the first microlens (310) near the light-emitting unit (200); the refractive index of the third microlens (330) is greater than that of the first microlens (310); An encapsulation layer (400) is used to encapsulate the pixel definition layer (100) and the light-emitting unit (200). The first included angle between the side surface (311) and the plane containing the pixel definition layer (100) is related to the width of the opening and the thickness of the first microlens (310); or, The side surface (311) is an arc surface, and the second included angle between the tangent plane at the midpoint of the side surface (311) along the thickness direction and the plane where the pixel definition layer (100) is located is related to the width of the opening and the thickness of the first microlens (310). The first microlens (310) is located on the side of the encapsulation layer (400) facing the light-emitting surface, and the range of the first included angle or the second included angle satisfies the following formula: Where α is the first included angle or the second included angle, h1 is the width of the opening, h2 is the thickness of the encapsulation layer (400), and h3 is the thickness of the first microlens (310). or, The first microlens (310) is located between the encapsulation layer (400) and the pixel definition layer (100); the range of the first included angle or the second included angle satisfies the following formula: Where α is the first included angle or the second included angle, h1 is the width of the opening, and h3 is the thickness of the first microlens (310).

2. The display panel according to claim 1, characterized in that, Another portion of the second microlens (320) covers the side of the first microlens (310) facing the light-emitting surface; the refractive index of the second microlens (320) is greater than the refractive index of the first microlens (310).

3. The display panel according to claim 2, characterized in that, The refractive index of the third microlens (330) is less than that of the second microlens (320).

4. The display panel according to claim 1, characterized in that, The first side (311) of the first microlens (310) adjacent to the light-emitting unit (200) has its first side near the pixel definition layer (100) projected onto the pixel definition layer (100) with the opening edge; the second side (311) away from the pixel definition layer (100) has its second side projected onto the pixel definition layer (100) within the dam (110).

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