Display panel

Abstract

Disclosed in embodiments of the present application is a display panel. The display panel comprises a substrate, a light-emitting layer, an insulating layer, and a planarization layer. The insulating layer comprises protrusions and recesses arranged between adjacent protrusions. A first side wall curve formed by the side wall of each protrusion comprises a first arc and a second arc, and the central point of the first arc and the central point of the second arc are respectively located on the side of the side wall towards the protrusion and the side of the side wall towards the corresponding recess.

Description

Display panel Technical Field

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

[0002] Organic light-emitting diode (OLED) display panels offer high luminous efficiency, fast response speed, and the ability to be fabricated on flexible substrates. They offer advantages such as bend resistance and wide viewing angles, making them popular with a wide range of users. To improve the light extraction efficiency of OLED display panels, a microlens structure is typically used for light extraction. However, as shown in Figure 1, the sidewalls 107' of the existing microlens structure 104' intersect with a cross section perpendicular to the display panel's substrate, forming a straight line. This has limited benefits in improving the display panel's light extraction efficiency, making it difficult to achieve significant improvements.

[0003] Therefore, a display panel is urgently needed to solve the above technical problems. SUMMARY OF THE INVENTION

[0004] The present application provides a display panel that can alleviate the technical problem that the current microlens structure has limited improvement on the light extraction efficiency of the display panel and is difficult to significantly improve the light extraction efficiency of the display panel.

[0005] To solve the above problems, the technical solutions provided by this application are as follows:

[0006] The present application provides a display panel, comprising:

[0007] substrate;

[0008] a light-emitting layer, disposed on one side of the substrate, the light-emitting layer comprising a plurality of pixel units;

[0009] an insulating layer, disposed on a side of the light-emitting layer away from the substrate, the insulating layer comprising a plurality of raised portions disposed corresponding to the pixel units and grooves disposed between adjacent raised portions;

[0010] a flat layer, disposed on a side of the insulating layer away from the substrate, wherein the refractive index of the flat layer is smaller than the refractive index of the insulating layer;

[0011] In which, the side wall of the protrusion includes a first side wall curve, which is formed by the intersection of the side wall and the cross section perpendicular to the substrate, and the first side wall curve includes a first arc line and a second arc line, the center point of the first arc line is on the side of the side wall deviating from the protrusion, and the center point of the second arc line is on the side of the side wall deviating from the groove.

[0012] Preferably, the first arc line is convex toward the groove, and the second arc line is concave toward the convex portion.

[0013] Preferably, the first arc is arranged between the second arc and the substrate.

[0014] Preferably, the first arc has a first height in a direction perpendicular to the substrate, and the second arc has a second height in a direction perpendicular to the substrate.

[0015] Wherein, the first height is greater than or equal to the second height.

[0016] Preferably, the first side wall curve further includes: a third arc line, the center point of the third arc line is located on the side of the side wall deviating from the protruding portion, and the second arc line is arranged between the first arc line and the third arc line.

[0017] Preferably, the first arc has a first height in a direction perpendicular to the substrate, the second arc has a second height in a direction perpendicular to the substrate, and the third arc has a third height in a direction perpendicular to the substrate.

[0018] The first height is greater than or equal to the second height, and the second height is greater than or equal to the third height.

[0019] Preferably, the first sidewall curve further includes: a fourth arc line, the center point of the fourth arc line is located on the side of the sidewall deviating from the groove, and the third arc line is arranged between the second arc line and the fourth arc line.

[0020] Preferably, the third arc line is convex toward the groove, and the fourth arc line is concave toward the convex portion.

[0021] Preferably, the first side wall curve further includes: a fifth arc line, the center point of the fifth arc line is located on the side of the side wall deviating from the protruding portion, and the fourth arc line is arranged between the third arc line and the fifth arc line.

[0022] Preferably, the first sidewall curve further includes: a sixth arc line, the center point of the sixth arc line is located on the side of the sidewall deviating from the groove, and the fifth arc line is arranged between the fourth arc line and the sixth arc line.

[0023] Preferably, the fifth arc line is convex toward the groove, and the sixth arc line is concave toward the convex portion.

[0024] Preferably, the second arc is arranged between the first arc and the substrate.

[0025] Preferably, along the direction from the substrate to the protruding portion, an end of the first arc close to the second arc is tangent to an end of the second arc close to the first arc.

[0026] Preferably, the radius of curvature of any point on the first arc line is greater than 0.6 microns and less than 3 microns, and the radius of curvature of any point on the second arc line is greater than 0.6 microns and less than 3 microns.

[0027] Preferably, the protrusion includes a first surface close to the substrate and a second surface away from the substrate.

[0028] The first surface and the second surface intersect with the same cross section perpendicular to the substrate to form a first intersection line and a second intersection line, and the length of the first intersection line is greater than the length of the second intersection line.

[0029] The first arc line and the second arc line are disposed between the first intersection line and the second intersection line.

[0030] Preferably, the first arc includes a first vertex, and a first acute angle formed by a tangent line of the first arc passing through the first vertex and intersecting the first intersection line is in a range of 20 degrees to 55 degrees;

[0031] The second arc includes a second vertex, and a second acute angle formed by a tangent line of the second arc passing through the second vertex and intersecting the second intersection line is in a range of 20 degrees to 55 degrees.

[0032] Preferably, the display panel further includes:

[0033] an encapsulation layer, disposed on a side of the light-emitting layer away from the substrate;

[0034] A touch layer is arranged on a side of the packaging layer away from the substrate, and the touch layer includes: the insulating layer, the planar layer, a first metal layer, and a second metal layer, wherein the insulating layer includes a first insulating sublayer and a second insulating sublayer stacked together, the first metal layer is arranged between the first insulating sublayer and the second insulating sublayer, and the second metal layer is arranged between the second insulating sublayer and the planar layer.

[0035] Preferably, the second metal layer includes touch electrodes arranged between the corresponding pixel units, and the first metal layer includes touch traces arranged between the corresponding pixel units.

[0036] The insulating layer also includes: an insulating portion arranged between the pixel units, the groove is arranged between the insulating portion and the raised portion, the insulating portion includes: a first insulating sub-portion arranged corresponding to the first insulating sub-layer and a second insulating sub-portion corresponding to the second insulating sub-layer, the touch line is arranged between the first insulating sub-portion and the second insulating sub-portion, and the touch electrode is arranged between the second insulating sub-portion and the flat layer.

[0037] Preferably, the thickness of the insulating layer is greater than or equal to 0.5 microns.

[0038] Preferably, the insulating layer comprises an inorganic material, and the planarizing layer comprises an organic material. Beneficial effects

[0039] The present application forms a first side wall curve by setting the side wall of the protrusion. The first side wall curve forms a first arc line whose center point is located on the side of the side wall deviating from the protrusion and a second arc line whose center point is located on the side of the side wall deviating from the groove, thereby effectively improving the light output efficiency of the display panel, reducing the power consumption of the display panel, and extending the service life of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] FIG1 is a schematic structural diagram of a microlens structure in the prior art;

[0041] FIG2 is a schematic structural diagram of a first structure of a display panel provided in an embodiment of the present application;

[0042] FIG3 is a schematic structural diagram of a second structure of a display panel provided in an embodiment of the present application;

[0043] FIG4 is a schematic structural diagram of a first structure of a raised portion of a display panel provided in an embodiment of the present application;

[0044] FIG5 is a schematic structural diagram of a second structure of a raised portion of a display panel provided in an embodiment of the present application;

[0045] FIG6 is a schematic structural diagram of a third structure of a raised portion of a display panel provided in an embodiment of the present application;

[0046] FIG7 is a schematic structural diagram of the straight edge approximation of the raised portion in FIG6 ;

[0047] FIG8 is a schematic structural diagram of a fourth structure of a raised portion of a display panel provided in an embodiment of the present application;

[0048] FIG9 is a schematic structural diagram of the raised portion in FIG8 after being approximated by straight edges;

[0049] FIG10 is a schematic structural diagram of a fifth structure of a raised portion of a display panel provided in an embodiment of the present application;

[0050] FIG11 is a schematic structural diagram of a sixth structure of a raised portion of a display panel provided in an embodiment of the present application;

[0051] FIG. 12 shows the effect of the angle α and / or angle β of the raised portion of the display panel provided by an embodiment of the present application on the improvement of luminous efficiency.

[0052] Implementation Methods of the Application

[0053] The present application provides a display panel. To make the purpose, technical solution, and effects of the present application clearer and more explicit, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and are not intended to limit the present application.

[0054] Currently, the microlens structure used in a display panel has limited effect on improving the light extraction efficiency of the display panel, and there is a technical problem that it is difficult to effectively improve the light extraction efficiency of the display panel.

[0055] Referring to FIG. 2 to FIG. 11 , an embodiment of the present application provides a display panel 100 , including:

[0056] substrate 101;

[0057] A light-emitting layer 102 is provided on one side of the substrate 101, and the light-emitting layer 102 includes a plurality of pixel units 102a;

[0058] an insulating layer 103 disposed on a side of the light-emitting layer 102 away from the substrate 101 , the insulating layer 103 including a plurality of raised portions 104 corresponding to the pixel units 102 a and grooves 105 between adjacent raised portions 104 ;

[0059] a flat layer 106 , disposed on a side of the insulating layer 103 away from the substrate 101 , wherein the refractive index of the flat layer 106 is smaller than that of the insulating layer 103 ;

[0060] In which, the side wall 107 of the raised portion 104 includes a first side wall curve 108, and the first side wall curve 108 is formed by the intersection of the side wall 107 and the cross section perpendicular to the substrate 101. The first side wall curve 108 includes a first arc line 108a and a second arc line 108b. The center point of the first arc line 108a is located on the side of the side wall 107 that deviates from the raised portion 104, and the center point of the second arc line 108b is located on the side of the side wall 107 that deviates from the groove 105.

[0061] In the embodiment of the present application, a first sidewall curve 108 is formed by setting the sidewall of the protrusion 104. The first sidewall curve 108 forms a first arc 108a whose center point is located on the side of the sidewall deviating from the protrusion 104 and a second arc 108b whose center point is located on the side of the sidewall deviating from the groove 105, thereby effectively improving the light extraction efficiency of the display panel, reducing the power consumption of the display panel, and extending the service life of the display panel.

[0062] The technical solution of this application is now described in conjunction with specific embodiments.

[0063] In this embodiment, referring to Figures 5, 6, and 8, the center point O1 of the first arc 108a is the center point of a circle corresponding to at least three points on the first arc 108a. The center point O1 of the first arc 108a is located on the side of the sidewall 107 that is closer to the protrusion 104. In other words, the center point of the circle corresponding to at least three points on the first arc 108a is located on the side of the sidewall 107 that is closer to the protrusion 104.

[0064] In this embodiment, referring to Figures 5, 6, and 8, the center point O2 of the second arc 108b is the center point of a circle corresponding to at least three points on the second arc 108b. The center point O2 of the second arc 108b is located on the side of the sidewall 107 that deviates from the groove 105. In other words, the center point of the circle corresponding to at least three points on the second arc 108b is located on the side of the sidewall 107 that deviates from the groove 105.

[0065] In some embodiments, the first curved line 108a is convex toward the groove 105, and the second curved line 108b is concave toward the protrusion 104. Referring to Figures 1 and 4, when the first sidewall curve 108 includes the first curved line 108a and the second curved line 108b, compared to when the first sidewall curve 108 is a straight line, due to the difference in normal direction, more light emitted by the pixel unit 102a that is incident on the sidewall 107 and exits the sidewall 107 can be emitted in a direction perpendicular to the display surface of the display panel, thereby further improving the effect of the protrusion 104 on improving the light extraction efficiency of the display panel 100. The different protrusion and depression directions of the first arc 108a and the second arc 108b facilitates improving the emission angle of light emitted by the pixel unit 102a, incident on the sidewall 107, and emitted from the sidewall as much as possible, so that as much light as possible is emitted in a direction perpendicular to the display surface of the display panel, thereby further improving the effect of the raised portion 104 on improving the light extraction efficiency of the display panel 100. It will be understood that in this application, "light is emitted in a direction perpendicular to the display surface of the display panel" means that the angle between the emission direction of the light and the display surface of the display panel is between 85 degrees and 95 degrees.

[0066] In some embodiments, the first arc line 108 a is disposed between the second arc line 108 b and the substrate 101 . Alternatively, the second arc line 108 b is disposed between the first arc line 108 a and the substrate 101 .

[0067] Referring to FIG6 , when multiple light rays from L1 to L4 are incident on the sidewall 107, the normals of the incident light rays in the continuously alternating convex-then-concave arcs from the substrate 101 to the raised portion 104 are different. Therefore, the light rays can be emitted perpendicular to the display surface of the display panel while satisfying the law of refraction, thereby improving the light extraction efficiency of the display panel 100 at normal viewing angles. Referring again to FIG8 , when multiple light rays from L1 to L4 are incident on the sidewall 107, in the continuously alternating concave-then-convex arcs from the substrate 101 to the raised portion 104, many light rays (such as light ray 3) are totally reflected due to the excessively large incident angle at the intersection of the first and second arcs 108a, 108b, thereby reducing the light extraction efficiency. Therefore, preferably, the first arc 108a is positioned between the second arc 108b and the substrate 101.

[0068] In some embodiments, the raised portion 104 includes a first surface 109 proximal to the substrate 101 and a second surface 110 distal to the substrate 101. The first surface 109 and the second surface 110 intersect with the same cross section perpendicular to the substrate 101 to form a first intersection line 109a and a second intersection line 110a. The first arc 108a and the second arc 108b are disposed between the first intersection line 109a and the second intersection line 110a. The first arc 108a includes a first vertex, which is the point on the first arc 108a farthest from the center of the first arc 108a; or, when the first arc 108a is a circular arc, the first vertex is the midpoint of the first arc 108a. The second arc 108b includes a second vertex, which is the point on the second arc 108b farthest from the center of the second arc 108b; or, when the second arc 108b is a circular arc, the second vertex is the midpoint of the second arc 108b. 6 to 9 , it can also be demonstrated from another perspective that the first arc 108a is preferably disposed between the second arc 108b and the substrate 101. Specifically, the first arc 108a and the second arc 108b in the first sidewall curve 108 in FIG6 and FIG9 can be approximated by a straight edge (as shown in FIG7 and FIG9 ), that is, the first sidewall curve 108 is fitted into three straight lines by connecting an end of a first intersection line 109a on the side of the protrusion 104 close to the substrate 101 close to the first arc 108a and the first vertex of the first arc 108a, the first vertex of the first arc 108a and the second vertex of the second arc 108b in the same first sidewall curve 108, and the end of the second arc 108b and the second intersection line 110a close to the second arc 108b. When the first arc 108a is located between the second arc 108b and the substrate 101, the angles between each straight line segment and the first intersection line 109a along the direction from the protrusion 104 to the substrate 101 are θ1, θ2, and θ3. When the second arc 108b is located between the first arc 108a and the substrate 101, the angles between each straight line segment and the first intersection line 109a along the direction from the protrusion 104 to the substrate 101 are θ4, θ5, and θ6. When the shapes of each first arc 108a and each second arc 108b are the same, θ1 = θ6 and θ3 = θ4. The differences between the two structures are mainly concentrated in θ2 and θ5, where θ5 is greater than θ2. As shown in FIG. 11 , when the angle is greater than 30 degrees, the improvement in the light extraction efficiency of the display panel 100 decreases as the angle increases. Therefore, when the first curved line 108 a is located between the second curved line 108 b and the substrate 101 , the light extraction efficiency of the display panel 100 is higher.

[0069] In some embodiments, along the direction from the substrate 101 to the protrusion 104, an end of the first arc 108a close to the second arc 108b is tangent to an end of the second arc 108b close to the first arc 108a, so as to facilitate a smooth transition between the first arc 108a and the second arc 108b.

[0070] In some embodiments, the curved surface of the first sidewall curve 108 that is convex toward the side away from the first intersection line 109a makes it easier for light incident on the sidewall 107 to be emitted perpendicularly to the display surface of the display panel at the sidewall 107. Therefore, the first curved line 108a has a first height in a direction perpendicular to the substrate 101, and the second curved line 108b has a second height in a direction perpendicular to the substrate 101, wherein the first height is greater than or equal to the second height.

[0071] In some embodiments, the center points of multiple arcs in the first sidewall curve 108 are located on the side of the sidewall 107 deviating from the protrusion 104 , and the center point of at least one end of the arc is located on the side of the sidewall 107 deviating from the groove 105 .

[0072] Referring to Figures 10 and 11 , in some embodiments, the first sidewall curve 108 further includes a third arc 108c, the center point of which is located on the side of the sidewall 107 that deviates toward the raised portion 104. The second arc 108b is disposed between the first arc 108a and the third arc 108c. The center point of the third arc 108c is the center point of a circle corresponding to at least three points on the third arc 108c. Specifically, the third arc 108c is convex toward the groove 105. Along the direction from the substrate 101 to the raised portion 104, an end of the third arc 108c close to the second arc 108b is tangent to an end of the second arc 108b close to the third arc 108c, and an end of the first arc 108a close to the second arc 108b is tangent to an end of the second arc 108b close to the first arc 108a, so as to facilitate a smooth transition between the first arc 108a, the second arc 108b and the third arc 108c.

[0073] In some embodiments, the first arc 108a has a first height in a direction perpendicular to the substrate 101, the second arc 108b has a second height in a direction perpendicular to the substrate 101, and the third arc 108c has a third height in a direction perpendicular to the substrate 101, wherein the sum of the first height and the third height is greater than or equal to the second height. Preferably, the first height is greater than or equal to the second height, and the second height is greater than or equal to the third height.

[0074] Referring to Figures 10 and 11 , in some embodiments, the first sidewall curve 108 further includes a fourth arc 108d, the center point of which is located on the side of the sidewall 107 that deviates from the groove 105. The third arc 108c is disposed between the second arc 108b and the fourth arc 108d. The center point of the fourth arc 108d is the center point of a circle corresponding to at least three points on the fourth arc 108d. Specifically, the fourth arc 108d is recessed toward the protrusion 104. The end of the fourth arc 108d closest to the third arc 108c is tangent to the end of the third arc 108c closest to the fourth arc 108d, thereby facilitating a smooth transition between the multiple arc segments that comprise the first sidewall curve 108.

[0075] In some embodiments, the fourth arc 108d has a fourth height in a direction perpendicular to the substrate 101, and the sum of the first height and the third height is greater than or equal to the sum of the second height and the fourth height. Preferably, the first height is greater than or equal to the second height, and the third height is greater than or equal to the fourth height.

[0076] Referring to Figures 10 and 11 , in some embodiments, the first sidewall curve 108 further includes a fifth arc 108e, the center point of which is located on the side of the sidewall 107 that deviates toward the raised portion 104. The fourth arc 108d is disposed between the third arc 108c and the fifth arc 108e. The center point of the fifth arc 108e is the center point of a circle corresponding to at least three points on the fifth arc 108e. Specifically, the fifth arc 108e protrudes toward the groove 105. The end of the fifth arc 108e that is closest to the fourth arc 108d is tangent to the end of the fourth arc 108d that is closest to the fifth arc 108e, thereby facilitating a smooth transition between the multiple arc segments that comprise the first sidewall curve 108.

[0077] In some embodiments, the fifth arc 108e has a fifth height in a direction perpendicular to the substrate 101, and the sum of the first height, the third height, and the fifth height is greater than or equal to the sum of the second height and the fourth height. Preferably, the fifth height is less than or equal to the fourth height.

[0078] Referring to Figures 10 and 11 , in some embodiments, the first sidewall curve 108 further includes a sixth arc 108f, the center point of which is located on the side of the sidewall 107 that deviates from the groove 105. The fifth arc 108e is disposed between the fourth arc 108d and the sixth arc 108f. The center point of the sixth arc 108f is the center point of a circle corresponding to at least three points on the sixth arc 108f. Specifically, the sixth arc 108f is recessed toward the protrusion 104. The end of the sixth arc 108f closest to the fifth arc 108e is tangent to the end of the fifth arc 108e closest to the sixth arc 108f, thereby facilitating a smooth transition between the multiple arc segments that comprise the first sidewall curve 108.

[0079] In some embodiments, the sixth arc 108f has a sixth height in a direction perpendicular to the substrate 101. The sum of the first height, the third height, and the fifth height is greater than or equal to the sum of the second height, the fourth height, and the sixth height. Preferably, the first height is greater than or equal to the second height, the third height is greater than or equal to the fourth height, and the fifth height is greater than or equal to the sixth height.

[0080] In some embodiments, a first acute angle formed by a tangent line of the first arc 108a passing through the first vertex and intersecting the first intersection line 109a is between 20 degrees and 55 degrees, for example, 30 degrees, 35 degrees, 40 degrees, 45 degrees, 50 degrees, etc.; and / or a second acute angle formed by a tangent line of the second arc 108b passing through the second vertex and intersecting the first intersection line 109a is between 20 degrees and 55 degrees, for example, 30 degrees, 35 degrees, 40 degrees, 45 degrees, 50 degrees, etc. Referring to FIG. 12 , the inventors discovered that the first acute angle α formed between the tangent line of the first arc 108a at the first vertex and the first intersection line 109a and / or the second acute angle β formed between the tangent line of the second arc 108b at the second vertex and the first intersection line 109a improve the light extraction efficiency of the display panel 100 (e.g., green pixel unit) by first increasing and then decreasing. When the first acute angle α formed by the first arc 108a between the tangent of the first vertex and the first intersection line 109a and / or the second acute angle β formed by the second arc 108b between the tangent of the second vertex and the first intersection line 109a is less than 30 degrees, the light extraction efficiency of the display panel 100 is improved as the angle increases; when the first acute angle α formed by the first arc 108a between the tangent of the first vertex and the first intersection line 109a and / or the second acute angle β formed by the second arc 108b between the tangent of the second vertex and the first intersection line 109a is greater than 30 degrees, the light extraction efficiency of the display panel 100 decreases as the angle increases. Therefore, by setting the first acute angle α formed by the first arc 108a between the tangent of the first vertex and the first intersection line 109a and / or the second acute angle β formed by the second arc 108b between the tangent of the second vertex and the first intersection line 109a to be greater than or equal to 20 degrees and less than or equal to 55 degrees, it is beneficial to enable the raised portion 104 to have a higher improvement in the light extraction efficiency of the display panel 100.

[0081] When the first sidewall curve 108 further includes the third arc 108c, the third arc 108c includes a third vertex, and the magnitude of the third acute angle formed by the tangent of the third arc 108c passing through the third vertex and intersecting the first intersection line 109a is 20 to 55 degrees, for example, 30, 35, 40, 45, 50, etc. The third vertex is similar to the first and second vertices, and is the point on the third arc 108c farthest from the center point of the third arc 108c; alternatively, when the third arc 108c is a circular arc, the third vertex is the midpoint of the third arc 108c.

[0082] When the first sidewall curve 108 further includes the fourth arc 108d, the fourth arc 108d includes a fourth vertex, and the magnitude of the fourth acute angle formed by the tangent of the fourth arc 108d passing through the fourth vertex and intersecting the first intersection line 109a is 20 to 55 degrees, for example, 30, 35, 40, 45, 50 degrees, etc. The fourth vertex is similar to the first and second vertices, and is the point on the fourth arc 108d farthest from the center point of the fourth arc 108d; or, when the fourth arc 108d is a circular arc, the fourth vertex is the midpoint of the fourth arc 108d.

[0083] When the first sidewall curve 108 further includes the fifth arc 108e, the fifth arc 108e includes a fifth vertex, and the magnitude of the fifth acute angle formed by the tangent of the fifth arc 108e passing through the fifth vertex and intersecting the first intersection line 109a is 20 to 55 degrees, for example, 30, 35, 40, 45, 50 degrees, etc. The fifth vertex is similar to the first and second vertices, and is the point on the fifth arc 108e farthest from the center point of the fifth arc 108e. Alternatively, when the fifth arc 108e is a circular arc, the fifth vertex is the midpoint of the fifth arc 108e.

[0084] When the first sidewall curve 108 further includes the sixth arc 108f, the sixth arc 108f includes a sixth vertex, and a sixth acute angle formed by a tangent line of the sixth arc 108f passing through the sixth vertex and intersecting the first intersection line 109a is in a range of 20 to 55 degrees, for example, 30, 35, 40, 45, or 50 degrees. The sixth vertex is similar to the first and second vertices, being the point on the sixth arc 108f farthest from the center of the sixth arc 108f. Alternatively, when the sixth arc 108f is a circular arc, the sixth vertex is the midpoint of the sixth arc 108f.

[0085] In some embodiments, the radius of curvature of any point on each arc line in the first sidewall curve 108 is greater than 0.6 microns, and the radius of curvature of any point on each arc line in the first sidewall curve 108 is less than 3 microns. For example, it can be 0.8 microns, 1 micron, 1.2 microns, 1.5 microns, 1.8 microns, 2 microns, 2.5 microns, etc., so as to ensure that the acute angle formed between the vertex of each arc line on the first sidewall curve 108 and the first intersection line 109a is maintained in the range of 20 degrees to 55 degrees and maintains a suitable curvature. Specifically, the radius of curvature of any point on the first arc 108a is greater than 0.6 microns and less than 3 microns, and the radius of curvature of any point on the second arc 108b is greater than 0.6 microns and less than 3 microns; when the first sidewall curve 108 has the third arc 108c, the radius of curvature of any point on the third arc 108c is greater than 0.6 microns and less than 3 microns; when the first sidewall curve 108 has the fourth arc 108d, the radius of curvature of any point on the fourth arc 108d is greater than 0.6 microns and less than 3 microns; when the first sidewall curve 108 has the fifth arc 108e, the radius of curvature of any point on the fifth arc 108e is greater than 0.6 microns and less than 3 microns; when the first sidewall curve 108 has the sixth arc 108f, the radius of curvature of any point on the sixth arc 108f is greater than 0.6 microns and less than 3 microns.

[0086] Referring to FIG. 2 , in some embodiments, the display panel 100 further includes a pixel definition layer 111. The pixel definition layer 111 and the pixel unit 102a are located on the same side of the substrate 101. The pixel definition layer 111 includes pixel definition portions and a first opening located between the pixel definition portions. The pixel unit 102a is located within the first opening. The protrusion 104 is disposed corresponding to the first opening.

[0087] In some embodiments, the orthographic projection of the pixel unit 102a in the plane where the second surface 110 of the raised portion 104 is located is located within the second surface 110, the orthographic projection of the first surface 109 in the plane where the second surface 110 is located covers the second surface 110, and the length of the first intersection line 109a is greater than the length of the second intersection line 110a, so that as much light as possible emitted by the pixel unit 102a can change its exit direction through the side wall 107, so that more light can be emitted in a direction perpendicular to the display surface of the display panel, thereby improving the light output rate of the display panel 100.

[0088] In some embodiments, the display panel 100 includes an anode, a light-emitting layer 102, and a cathode layer. The anode is located within the first opening, and the pixel definition portion surrounds the anode and covers the edge of the anode. The light-emitting layer 102 is located on the side of the pixel definition layer 111 away from the substrate 101, and the cathode layer covers the light-emitting layer 102. Along the direction from the anode to the cathode layer, the light-emitting layer 102 includes a hole-forming organic layer, a light-emitting material layer, and an electronic organic layer stacked in sequence. The hole-forming organic layer may include a hole injection layer and a hole transport layer. The hole injection layer is in direct contact with the anode, and the hole transport layer is located between the hole injection layer and the light-emitting material layer. The hole-forming organic layer may further include an electron blocking layer located between the hole transport layer and the light-emitting material layer. The electronic organic layer may include an electron injection layer and an electron transport layer. The electron injection layer is in direct contact with the cathode layer, and the electron transport layer is located between the electron injection layer and the light-emitting material layer. The electronic organic layer may further include a hole blocking layer located between the electron transport layer and the light-emitting material layer.

[0089] The pixel unit 102a is composed of the light-emitting layer 102 located in the first opening. When the display panel 100 is displayed, the pixel unit 102a participating in the display emits light, and at least part of the light emitted by the pixel unit 102a changes its emission angle through the protrusion 104, so that it is emitted in a direction perpendicular to the display surface of the display panel, thereby improving the light output rate of the display panel 100.

[0090] In some embodiments, the display panel 100 further includes an encapsulation layer 112 located on a side of the light-emitting layer 102 away from the substrate 101. The encapsulation layer 112 may be formed by alternately laminating one or more organic layers and one or more inorganic layers. A plurality of inorganic layers or organic layers may be provided. The organic layer is formed from a polymer and may be, for example, a laminate or single layer formed from any one of polyethylene terephthalate, polyimide, polycarbonate, epoxy resin, polyethylene, and polyacrylate. The organic layer may be formed from a polyacrylate, specifically a material obtained by polymerizing a monomer composition comprising a diacrylate-based monomer and a triacrylate-based monomer. The monomer composition may also include a monoacrylate-based monomer. Furthermore, the monomer composition may include a well-known photoinitiator such as TPO, but the monomer composition is not limited thereto. The inorganic layer may be a laminate or single layer comprising a metal oxide or metal nitride. For example, the inorganic layer may include any one of SiNx, Al2O3, SiO2, and TiO2. The encapsulation layer 112 may include, in a direction away from the substrate 101, a first inorganic encapsulation layer 112a, a first organic encapsulation layer 112b, and a second inorganic encapsulation layer 112c located on the cathode layer (as shown in FIG1 ). Furthermore, the encapsulation layer 112 may include, in a direction away from the substrate 101, a first inorganic encapsulation layer, a first organic encapsulation layer, a second inorganic encapsulation layer, a second organic encapsulation layer, and a third inorganic encapsulation layer located on the cathode layer. Furthermore, the encapsulation layer 112 may include, in a direction away from the substrate 101, a first inorganic encapsulation layer, a first organic encapsulation layer, a second inorganic encapsulation layer, a second organic encapsulation layer, a third inorganic encapsulation layer, a third organic encapsulation layer, and a fourth inorganic encapsulation layer located on the cathode layer.

[0091] Please refer to Figures 2 and 3. In some embodiments, the display panel 100 also includes a touch layer 113, which is arranged on a side of the encapsulation layer 112 away from the substrate 101. The touch layer 113 includes: the insulating layer 103, the flat layer 106, a first metal layer 114, and a second metal layer 115. The insulating layer 103 includes a first insulating sublayer 103a and a second insulating sublayer 103b that are stacked, the first metal layer 114 is arranged between the first insulating sublayer 103a and the second insulating sublayer 103b, and the second metal layer 115 is arranged between the second insulating sublayer 103b and the flat layer 106.

[0092] In some embodiments, the second metal layer 115 includes touch electrodes disposed between the corresponding pixel units 102 a , and the first metal layer 114 includes touch traces disposed between the corresponding pixel units 102 a .

[0093] Please refer to Figures 2 and 3. In some embodiments, the insulating layer 103 further includes: an insulating portion 116 arranged between the pixel units 102a, the groove 105 is arranged between the insulating portion 116 and the raised portion 104, the insulating portion 116 includes: a first insulating sub-portion 116a arranged corresponding to the first insulating sub-layer 103a and a second insulating sub-portion 116b corresponding to the second insulating sub-layer 103b, the touch trace is arranged between the first insulating sub-portion 116a and the second insulating sub-portion 116b, and the touch electrode is arranged between the second insulating sub-portion 116b and the flat layer 106.

[0094] In some embodiments, the planar layer 106 covers the insulating layer 103 , the groove 105 forms a second opening exposing the encapsulation layer 112 , and the planar layer 106 covering the second opening is in direct contact with the encapsulation layer 112 .

[0095] In some embodiments, the planarization layer 106 includes an organic material to planarize the surface of the touch layer 113 away from the substrate 101 .

[0096] In some embodiments, the refractive index difference between the protrusion 104 and the flat layer 106 is greater than or equal to 0.3, and the refractive index difference between the protrusion 104 and the flat layer 106 is less than or equal to 0.5, for example, it can be 0.35, 0.4, 0.45, etc.

[0097] In some embodiments, the insulating layer 103 includes inorganic materials, and using less inorganic materials can effectively separate the first metal layer 114 and the second metal layer 115 to play an insulating role; at the same time, the insulating layer 103 including inorganic materials and the flat layer 106 including organic materials are more likely to produce refractive index differences, thereby making it easier to change the emission angle of the light passing through the side wall 107, so that more light is emitted at an angle perpendicular to the display surface of the display panel, thereby improving the light extraction efficiency of the display panel.

[0098] Referring to Figures 2 and 3, in some embodiments, the raised portion 104 includes a first raised sub-portion 104a located on the first insulating sub-layer 103a and a second raised sub-portion 104b located on the second insulating sub-layer 103b. The raised portion 104 may be composed of the first raised sub-portion 104a and the second raised sub-portion 104b. A certain refractive index difference may or may not exist between the first sub-lens and the second sub-lens. In this case, the refractive index difference between the first raised sub-portion 104a and the flat layer 106 is greater than or equal to 0.3, and the refractive index difference between the first raised sub-portion 104a and the flat layer 106 is less than or equal to 0.5; the refractive index difference between the second raised sub-portion 104b and the flat layer 106 is greater than or equal to 0.3, and the refractive index difference between the second raised sub-portion 104b and the flat layer 106 is less than or equal to 0.5.

[0099] In some embodiments, the thickness of the protrusion 104 is greater than or equal to 0.5 microns, for example, 0.6 microns, 0.8 microns, 1 micron, 1.5 microns, 2 microns, etc., so as to effectively improve the light extraction efficiency of the display panel 100. The protrusion 104 is located on the insulating layer 103, and the thickness of the insulating layer 103 is greater than or equal to 0.5 microns, for example, 0.6 microns, 0.8 microns, 1 micron, 1.5 microns, 2 microns, etc.

[0100] Please refer to Figure 2. In some embodiments, the substrate 101 includes a substrate 120, a buffer layer 121 located on one side of the substrate 120, a thin film transistor layer 122 located on a side of the buffer layer 121 away from the substrate 120, and a second planar layer 117 located on a side of the thin film transistor layer 122 away from the substrate 120.

[0101] The substrate 120 may be a rigid substrate 120, such as a glass substrate 120; or the substrate 120 may be a flexible substrate 120, such as a polyimide substrate 120. When the substrate 120 is a flexible substrate 120, the substrate 120 includes a first flexible sub-substrate 120, an intermediate layer, an adhesive layer, and a second flexible sub-substrate 120. The first flexible sub-substrate 120 and the second flexible sub-substrate 120 may be formed of the same material, such as polyimide. The intermediate layer may be formed of an inorganic material including, for example, at least one of SiOx and SiNx, and the adhesive layer may be formed of hydrogenated amorphous silicon (a-Si:H).

[0102] The buffer layer 121 may include one or more inorganic insulating layers comprising materials such as silicon oxide or silicon nitride. The buffer layer 121 may provide a planarization layer on the upper surface of the substrate 120 and may block or prevent impurities and moisture from penetrating from the substrate 120 into the light-emitting layer. Specifically, the buffer layer 121 includes a first sub-buffer layer 121 formed, for example, of silicon nitride and a second sub-buffer layer 121 formed, for example, of silicon oxide. The second sub-buffer layer 121 and the first sub-buffer layer 121 may be formed of silicon nitride having the same film quality (for example, the same density and the same film stress), and an oxide film may be positioned at the interface between the second sub-buffer layer 121 and the first sub-buffer layer 121. In practical applications, the thickness of the first sub-buffer layer 121 may be 50 nm to 100 nm, and the thickness of the second sub-buffer layer 121 may be approximately 100 nm to 300 nm.

[0103] The thin film transistor layer 122 includes a thin film transistor, which includes a semiconductor formed on the buffer layer 121, and the semiconductor can be formed of polycrystalline silicon. The semiconductor is divided into a channel region and a source region and a drain region formed on both sides of the channel region. The channel region of the semiconductor is polycrystalline silicon without doping impurities, that is, an intrinsic semiconductor. The source region and the drain region are polycrystalline silicon doped with conductive impurities, that is, impurity semiconductors. The impurities doped in the source region and the drain region can be any one of P-type impurities and N-type impurities. The thin film transistor layer 122 also includes a first gate insulating layer, which covers the semiconductor. The first gate insulating layer can be a plurality of layers or a single layer including at least one of tetraethyl orthosilicate (tetraethyl orthosilicate, TEOS), silicon nitride, and silicon oxide.

[0104] The thin film transistor also includes a first gate electrode formed on the first gate insulating layer, the first gate electrode overlapping the channel region. The first gate electrode may be formed as multiple layers or a single layer comprising a low-resistance material such as Al, Ti, Mo, Cu, Ni, or alloys thereof, or a material with high corrosion resistance. The thin film transistor layer 122 also includes a second gate insulating layer, the second gate insulating layer covering the first gate electrode. The second gate insulating layer may be multiple layers or a single layer comprising at least one of tetraethyl orthosilicate (TEOS), silicon nitride, and silicon oxide. The thin film transistor also includes a second gate electrode formed on the second gate insulating layer, the second gate electrode overlapping the first gate electrode. The second gate electrode may be formed as multiple layers or a single layer comprising a low-resistance material such as Al, Ti, Mo, Cu, Ni, or alloys thereof, or a material with high corrosion resistance. The thin film transistor layer 122 also includes a first interlayer insulating layer formed on the second gate electrode. The first interlayer insulating layer may be formed as multiple layers or a single layer, for example, of tetraethyl orthosilicate (TEOS), silicon nitride, or silicon oxide. The first interlayer insulating layer, the first gate insulating layer, and the second gate insulating layer include a source contact hole and a drain contact hole, and the source region and the drain region are exposed through the source contact hole and the drain contact hole, respectively.

[0105] The thin film transistor also includes a source electrode and a drain electrode arranged in the same layer, both formed on the first interlayer insulating layer, the source electrode is connected to the source region through a source contact hole, and the drain electrode is connected to the drain region through a drain contact hole. The source electrode and the drain electrode can be multiple layers or a single layer formed of a low-resistance material such as Al, Ti, Mo, Cu, Ni, or an alloy thereof, or a material with high corrosion resistance. For example, the source electrode and the drain electrode can be a triple layer of Ti / Cu / Ti, Ti / Ag / Ti, Ti / Al / Ti or Mo / Al / Mo, or other single or multilayer structures.

[0106] The second planarization layer 117 is formed on the source and drain electrodes. The second planarization layer 117 can be formed as multiple layers or a single layer, for example, from tetraethylorthosilicate (TEOS), silicon nitride, or silicon oxide, and can be formed from an organic material with a low dielectric constant (e.g., polyimide). The second planarization layer 117 can include a first planarization sublayer 118 and a second planarization sublayer 119. The first planarization sublayer 118 is located on a side of the second planarization sublayer 119 that is closer to the substrate 120.

[0107] The substrate 101 further includes a metal transfer layer located between the first planar sub-layer 118 and the second planar sub-layer 119 , and the anode is connected to the thin film transistor through the metal transfer layer.

[0108] In some embodiments, the display panel 100 further includes a cover layer located on a side of the flat layer 106 away from the substrate 101 . The cover layer may be a flexible cover.

[0109] In some embodiments, the display panel 100 further includes a polarizing layer located between the cover layer and the planar layer 106 .

[0110] The display panel 100 provided in the embodiment of the present application forms a first sidewall curve 108 by setting the sidewall of the protrusion 104. The first sidewall curve 108 forms a first arc 108a whose center point is located on the side of the sidewall deviating from the protrusion 104 and a second arc 108b whose center point is located on the side of the sidewall deviating from the groove 105, thereby effectively improving the light extraction efficiency of the display panel, reducing the power consumption of the display panel, and extending the service life of the display panel.

[0111] An embodiment of the present application discloses a display panel, which includes a substrate, a light-emitting layer, an insulating layer, and a flat layer. The insulating layer includes a protrusion and a groove arranged between adjacent protrusions. The first sidewall curve formed by the sidewall of the protrusion includes a first arc and a second arc. The center point of the first arc and the center point of the second arc are respectively located on the side of the sidewall deviating from the protrusion and the side of the sidewall deviating from the groove. The present application forms a first sidewall curve by setting the sidewall of the protrusion. The first sidewall curve forms a first arc with a center point located on the side of the sidewall deviating from the protrusion and a second arc with a center point located on the side of the sidewall deviating from the groove, which effectively improves the light extraction efficiency of the display panel, reduces the power consumption of the display panel, and extends the service life of the display panel.

[0112] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this application, and all these changes or substitutions should fall within the scope of protection of the claims attached to this application.

Claims

1. A display panel, wherein: include: substrate; A light-emitting layer is disposed on one side of the substrate, and the light-emitting layer includes a plurality of pixel units; An insulating layer, arranged on a side of the light-emitting layer away from the substrate, the insulating layer comprising a plurality of raised portions arranged corresponding to the pixel units and grooves arranged between adjacent raised portions; A flat layer, disposed on a side of the insulating layer away from the substrate, wherein the refractive index of the flat layer is smaller than the refractive index of the insulating layer; Among them, the side wall of the protrusion includes a first side wall curve, which is formed by the intersection of the side wall and the cross section perpendicular to the substrate, and the first side wall curve includes a first arc line and a second arc line, the center point of the first arc line is on the side of the side wall deviating from the protrusion, and the center point of the second arc line is on the side of the side wall deviating from the groove.

2. The display panel according to claim 1, wherein: The first arc line is convex toward the groove, and the second arc line is concave toward the protrusion.

3. The display panel according to claim 1, wherein: The first arc line is disposed between the second arc line and the substrate.

4. The display panel according to claim 3, wherein: The first arc line has a first height in a direction perpendicular to the substrate, and the second arc line has a second height in a direction perpendicular to the substrate. Wherein, the first height is greater than or equal to the second height.

5. The display panel according to claim 3, wherein: The first side wall curve further includes: a third arc line, a center point of the third arc line is located on a side of the side wall deviating from the protruding portion, and the second arc line is arranged between the first arc line and the third arc line.

6. The display panel according to claim 5, wherein: The first arc line has a first height in a direction perpendicular to the substrate, the second arc line has a second height in a direction perpendicular to the substrate, and the third arc line has a third height in a direction perpendicular to the substrate. The first height is greater than or equal to the second height, and the second height is greater than or equal to the third height.

7. The display panel according to claim 5, wherein: The first side wall curve further includes: a fourth arc line, a center point of the fourth arc line is located on a side of the side wall deviating from the groove, and the third arc line is arranged between the second arc line and the fourth arc line.

8. The display panel according to claim 7, wherein: The third arc line is convex toward the groove, and the fourth arc line is concave toward the protrusion.

9. The display panel according to claim 7, wherein: The first side wall curve further includes: a fifth arc line, a center point of the fifth arc line is located on a side of the side wall deviating from the protruding portion, and the fourth arc line is arranged between the third arc line and the fifth arc line.

10. The display panel according to claim 9, wherein: The first side wall curve further includes: a sixth arc line, a center point of the sixth arc line is located on a side of the side wall deviating from the groove, and the fifth arc line is arranged between the fourth arc line and the sixth arc line.

11. The display panel according to claim 10, wherein: The fifth arc line is convex toward the groove, and the sixth arc line is concave toward the protrusion.

12. The display panel according to claim 1, wherein: The second arc line is disposed between the first arc line and the substrate.

13. The display panel according to claim 1, wherein: Along the direction from the substrate to the protruding portion, an end of the first arc line close to the second arc line is tangent to an end of the second arc line close to the first arc line.

14. The display panel according to claim 1, wherein: The radius of curvature of any point on the first arc line is greater than 0.6 micrometers and less than 3 micrometers, and the radius of curvature of any point on the second arc line is greater than 0.6 micrometers and less than 3 micrometers.

15. The display panel according to claim 1, wherein: The protrusion includes a first surface close to the substrate and a second surface away from the substrate, The first surface and the second surface intersect with the same cross section perpendicular to the substrate to form a first intersection line and a second intersection line, and the length of the first intersection line is greater than the length of the second intersection line. The first arc line and the second arc line are disposed between the first intersection line and the second intersection line.

16. The display panel according to claim 15, wherein: The first arc includes a first vertex, and a first acute angle between a tangent line of the first arc passing through the first vertex and the first intersection line is in a range of 20 to 55 degrees; The second arc line includes a second vertex, and a second acute angle formed by a tangent line of the second arc line passing through the second vertex and intersecting the second intersection line is in a range of 20 degrees to 55 degrees.

17. The display panel according to claim 1, wherein: The display panel further includes: An encapsulation layer is arranged on a side of the light-emitting layer away from the substrate; A touch layer is arranged on a side of the packaging layer away from the substrate, and the touch layer includes: the insulating layer, the planar layer, a first metal layer, and a second metal layer, wherein the insulating layer includes a first insulating sublayer and a second insulating sublayer stacked together, the first metal layer is arranged between the first insulating sublayer and the second insulating sublayer, and the second metal layer is arranged between the second insulating sublayer and the planar layer.

18. The display panel according to claim 17, wherein: The second metal layer includes touch electrodes arranged between the corresponding pixel units, and the first metal layer includes touch traces arranged between the corresponding pixel units. The insulating layer also includes: an insulating portion arranged between the pixel units, the groove is arranged between the insulating portion and the protruding portion, the insulating portion includes: a first insulating sub-portion arranged corresponding to the first insulating sub-layer and a second insulating sub-portion corresponding to the second insulating sub-layer, the touch wiring is arranged between the first insulating sub-portion and the second insulating sub-portion, and the touch electrode is arranged between the second insulating sub-portion and the flat layer.

19. The display panel according to claim 1, wherein: The thickness of the insulating layer is greater than or equal to 0.5 micrometers.

20. The display panel according to claim 1, wherein: The insulating layer includes an inorganic material, and the planarizing layer includes an organic material.

Images