CN115548046A

CN115548046A - Display device

Info

Publication number: CN115548046A
Application number: CN202110736855.0A
Authority: CN
Inventors: 张廷斌; 林昌廷; 刘晓伟; 孙明晓; 刘永锋
Original assignee: Hisense Visual Technology Co Ltd
Current assignee: Hisense Visual Technology Co Ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2022-12-30

Abstract

The invention discloses a display device, comprising: the light emitting device comprises a driving substrate, a plurality of common voltage lines, a plurality of first electrodes, a plurality of light emitting structure layers, an insulating layer and a second electrode. The insulating layer has a first insulating layer opening exposing the light emitting structure layer and a second insulating layer opening exposing the common voltage line, and the second electrode may be electrically connected in direct contact with the light emitting structure layer through the first insulating layer opening and in direct contact with the common voltage line through the second insulating layer opening. The common voltage line is provided with the protrusion structure having the protrusion opening, and due to the protrusion structure, when the second electrode is electrically connected with the common voltage line through the second insulating layer opening, the contact area between the second electrode and the common voltage line can be increased, so that the resistance of the second electrode can be reduced, and the IR Drop can be reduced.

Description

Display device

Technical Field

The invention relates to the technical field of display, in particular to a display device.

Background

The Micro Light Emitting Diode (Micro LED) display technology refers to a display technology in which a Light Emitting chip is directly used as a Light Emitting unit. The Micro LED inherits the characteristics of high efficiency, high brightness, high reliability, quick response time and the like of the traditional light emitting diode, has the characteristic of self luminescence without a backlight source, and has the advantages of energy conservation, simple mechanism, small volume, thinness and the like.

The top of the vertical Micro LED usually shares a common electrode, and the common electrode needs to use a high transmittance material in consideration of light extraction effect. However, the resistance of the high transmittance material is generally high, so that the common electrode has a certain voltage drop (IR drop) problem, and the Micro LEDs at different positions have different brightness.

Disclosure of Invention

In some embodiments of the present invention, a display device includes: the light emitting device comprises a driving substrate, a plurality of common voltage lines, a plurality of first electrodes, a plurality of light emitting structure layers, an insulating layer and a second electrode. The plurality of common voltage lines and the plurality of first electrodes are located on the driving substrate, the plurality of light emitting structure layers are located on one side, away from the driving substrate, of the first electrodes, the insulating layer is located on one side, away from the driving substrate, of the light emitting structure layers, and the second electrodes are arranged on one side, away from the driving substrate, of the insulating layer in a whole layer. And a light emitting structure layer electrically connected to the one electrode, the insulating layer having a first insulating layer opening exposing the light emitting structure layer and a second insulating layer opening exposing the common voltage line, the second electrode being electrically connected to the light emitting structure layer in direct contact through the first insulating layer opening and to the common voltage line in direct contact through the second insulating layer opening. Thus, the vertical light emitting diode can be formed by the first electrode, the light emitting structure layer and the second electrode. And, the common voltage line is provided with a protrusion structure having a protrusion opening. The orthographic projection of the projection opening on the driving substrate covers the orthographic projection of the first electrode on the driving substrate, and a gap is reserved between the boundary of the orthographic projection of the projection opening on the driving substrate and the boundary of the covered first electrode on the orthographic projection of the driving substrate, so that the projection structure is insulated from the first electrode. Due to the arrangement of the protruding structure, when the second electrode is electrically connected with the common voltage line through the second insulating layer opening, the contact area between the second electrode and the common voltage line can be increased, so that the resistance value of the second electrode can be reduced, and the IR Drop can be reduced.

In some embodiments of the present invention, the common voltage line includes: a transmission trace and a protruding structure electrically connected to each other; the transmission routing wires extend along a first direction and are arranged along a second direction; the plurality of first electrodes are arranged along a first direction to form a repeating unit group, and the repeating unit group is arranged along a second direction; the orthographic projection of the transmission routing on the driving substrate is positioned in a gap between the adjacent repeated unit groups; the protruding structure is positioned on at least one side of the transmission routing; and the orthographic projection of the projection opening on the driving substrate covers the orthographic projection of the transmission wiring adjacent to the projection opening on the driving substrate. Therefore, the voltage signal can be transmitted to the second electrode through the transmission wiring, and the resistance value of the second electrode can be reduced through the transmission wiring and the protruding structure.

In some embodiments of the invention, a projection arrangement comprises at least one annular portion and at least one connecting portion; the annular portion has a protruding opening; the connecting part extends along the second direction and electrically connects the annular part and the transmission line. This allows the annular portion to be disposed around the first electrode.

In some embodiments of the present invention, a plurality of protruding structures arranged at intervals are respectively disposed on two sides of the transmission trace; by arranging the first electrodes in a one-to-one correspondence with the protruding structures, the number of protruding structures can be maximized.

In some embodiments of the present invention, a plurality of protruding structures arranged at intervals are respectively disposed on two sides of the transmission trace; the projection structures can realize the composition design of other structural forms by electrically connecting at least one first electrode which is arranged on the same side of the transmission wiring and between the adjacent projection structures.

In some embodiments of the present invention, a plurality of protruding structures arranged at intervals are respectively disposed on two sides of the transmission trace; the protruding structures electrically connected to both sides of the transmission line are arranged based on the transmission line in a mirror image manner. The protruding structures can be symmetrically arranged, and the composition difficulty can be reduced.

In some embodiments of the present invention, a plurality of protruding structures arranged at intervals are respectively disposed on two sides of the transmission trace; the protruding structures electrically connected to both sides of the transmission lines may be arranged in a staggered manner based on the transmission lines.

In some embodiments of the present invention, the ring portions electrically connected to the same side of the transmission trace are electrically connected by a connection line to further reduce the IR Drop.

In some embodiments of the present invention, the protrusion structure may be a whole layer structure having a plurality of protrusion openings. This can reduce the patterning difficulty.

In some embodiments of the present invention, at least one repeating unit group is disposed between two adjacent transmission traces.

In some embodiments of the present invention, at least some of the adjacent transmission traces share the protruding structure, so that the connectivity between the transmission traces can be improved.

In some embodiments of the present invention, the thickness of the layer on which the common voltage line is formed is 100nm to 6 μm. By setting the thickness of the layer where the common voltage line is located, based on the resistance formula: r = ρ L/S, the coupling capacitance of the common voltage line can be reduced.

In some embodiments of the present invention, the second insulating layer opening has a step-shaped cross section in a direction perpendicular to the plane of the driving substrate; in the direction parallel to the plane of the driving substrate, a first thickness is formed between the part, away from one side of the driving substrate, in the ladder shape and the light-emitting structure; in the direction parallel to the plane of the driving substrate, a second thickness is formed between the part, close to one side of the driving substrate, in the ladder shape and the light-emitting structure; the first thickness is less than the second thickness. By making the first thickness smaller than the second thickness, the sidewall leakage current can be reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic top view of a display device according to an embodiment of the present invention;

FIG. 2a is a schematic cross-sectional view of the display device shown in FIG. 1 along the AA' direction according to the embodiment of the present invention;

FIG. 2b is a schematic cross-sectional view of the display device shown in FIG. 1 along the direction BB';

FIG. 2c is a schematic cross-sectional view along AA' of the display device shown in FIG. 1 according to the embodiment of the present invention;

fig. 3 is a second schematic top view of a display device according to an embodiment of the present invention;

fig. 4 is a third schematic top view illustrating a display device according to an embodiment of the invention;

fig. 5 is a fourth schematic view illustrating a top view structure of a display device according to an embodiment of the present invention;

fig. 6 is a fifth schematic view of a top view structure of a display device according to an embodiment of the present invention;

fig. 7 is a sixth schematic view of a top view of a display device according to an embodiment of the present invention;

fig. 8 is a seventh schematic diagram illustrating a top view structure of a display device according to an embodiment of the present invention;

fig. 9 is an eighth schematic top view of a display device according to an embodiment of the present invention.

Wherein, 100-drive base plate, 101 represents the substrate base plate, 102 represents the drive line layer, 110 represents the first electrode, 120 represents the luminous structure layer, 130 represents the insulating layer, 140 represents the second electrode, 200 represents the common voltage line, 210 represents the bulge structure, 220 represents the transmission line, 300 represents the connecting wire, KK1 represents the bulge opening, KK2-1 represents the first insulating layer opening, KK2-2 represents the second insulating layer opening, S0 represents the plane of drive base plate, H1 represents the first thickness, H2 represents the second thickness, H3 represents the third thickness, H4 represents the fourth thickness, AA represents the display area, CZ represents the repeating unit group, E0 represents the electric field.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without inventive step, are within the scope of protection of the invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

It should be noted that the sizes and shapes of the figures in the drawings are not to be considered true scale, but are merely intended to schematically illustrate the present invention. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

The vertical type Micro LED display device may include a base substrate 101, a driving line layer 102, a protective layer, an anode, a light emitting layer, and a common electrode. The anode is generally reflective to reflect light emitted from the light-emitting layer so that as much light as possible is emitted from the common electrode side from the light-emitting layer 6. In consideration of the light extraction effect, the common electrode needs to use a high-transmittance material. However, due to material and process limitations, the resistance of the high transmittance material is generally high, so that the common electrode has a certain voltage drop (IR drop) problem, and the Micro LEDs at different positions have different brightness. For example, if an extremely thin metal layer is used to improve the transmittance, the thin metal layer has a high resistance value, and thus a voltage drop problem occurs, which affects the display effect.

The embodiment of the invention provides a display device which can reduce IR Drop.

Fig. 1 is a schematic top view of a display device according to an embodiment of the present invention. Fig. 2a is a schematic cross-sectional view of the display device shown in fig. 1 along the direction AA' according to the embodiment of the present invention. Fig. 2b is a schematic cross-sectional view of the display device shown in fig. 1 along the direction BB' according to the embodiment of the present invention. Fig. 3 is a second schematic top view illustrating a display device according to an embodiment of the invention. Wherein the insulating layer and the second electrode are not shown in fig. 3.

Referring to fig. 1 to 3, a display device according to an embodiment of the present invention may include a driving substrate 100. The driving substrate 100 may include a substrate 101, a driving line layer 102, and a protective layer between the first electrode 110 and the driving line layer 102. The driving circuit layer 102 may include a plurality of driving units for controlling the Micro LEDs to perform active driving, and the driving units may generally include transistors, capacitors, resistors, and the like. Further, the driving circuit layer 102 further includes a plurality of gate lines and a plurality of data lines, the gate lines and the data lines are disposed to cross each other, and the gate lines and the data lines define a plurality of pixel units. In general, the driving unit includes a transistor having a gate electrode electrically connected to a corresponding gate line, a source electrode electrically connected to a corresponding data line, and a drain electrode electrically connected to the first electrode 110 of a corresponding Micro LED. When the gate line is scanned line by line, that is, when the gate line is loaded with an effective level signal, each data line corresponding to the gate line can load a data signal to each Micro LED corresponding to the gate line, thereby implementing active driving of the Micro LEDs.

In some examples, referring to fig. 1, the substrate base plate 101 may include a display area AA, and the display area AA may include a plurality of pixel units arranged in an array. Each pixel unit includes a plurality of sub-pixels. Each sub-pixel may comprise a micro light emitting diode. In some examples, the pixel unit may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel, so that color mixing may be performed by red, green, and blue to realize a color display. Alternatively, the pixel unit may also include a red sub-pixel, a green sub-pixel, a blue sub-pixel, and a white sub-pixel, so that color display may be realized by performing color mixing of red, green, blue, and white. Of course, in practical applications, the light emitting color of the sub-pixels in the pixel unit may be determined according to practical application environments, and is not limited herein.

In some examples, referring to fig. 1 to 3, the display area AA may include: the light emitting device includes a plurality of first electrodes 110 on a driving substrate 100, a plurality of light emitting structure layers 120 on a side of the first electrodes 110 away from the driving substrate 100, an insulating layer 130 on a side of the light emitting structure layers 120 away from the driving substrate 100, and a second electrode 140 disposed on a side of the insulating layer 130 away from the driving substrate 100. Each subpixel is provided with a first electrode 110 and a light emitting structure layer 120, and the light emitting structure layer 120 is electrically connected to the first electrode 110. The insulating layer 130 has a first insulating layer opening KK2-1 exposing the light emitting structure layer 120, and since the second electrode 140 is entirely disposed, the second electrode 140 may be electrically connected with the light emitting structure layer 120 through the first insulating layer opening KK 2-1. This allows the light emitting structure layer 120 to be electrically connected to the first electrode 110 and the second electrode 140, respectively, so that one first electrode 110, the light emitting structure layer 120 electrically connected to the first electrode 110, and the second electrode 140 electrically connected to the light emitting structure layer 120 can form a micro light emitting diode, such as a vertical micro light emitting diode.

In some examples, the light emitting structure layer 120 may include a first doping layer, a light emitting layer, and a second doping layer that are stacked. The first doped layer is located between the light emitting layer and the second electrode 140, and the second doped layer is located between the light emitting layer and the first electrode 110. The first doped layer may be N-doped or P-doped in a semiconductor material (e.g., gallium oxide, etc.) so that the first doped layer may provide electrons or holes. The light emitting layer may employ a multiple quantum well layer to improve light emitting efficiency. The second doped layer may be P-doped or N-doped in a semiconductor material (e.g., gallium oxide, etc.) so that the second doped layer may provide holes or electrons. The first doping layer and the second doping layer are positioned on two sides of the light emitting layer, the doping types of the two doping layers are opposite, and if the first doping layer is subjected to N-type doping, the second doping layer is subjected to P-type doping; if the first doping layer is doped in a P type, the second doping layer is doped in an N type. In practical applications, the above two structures can be applied, and are not limited herein.

In some examples, the first electrode 110 may be an ohmic contact layer matching a work function of the second doped layer, and may be made of metal such as nickel, gold, or a transparent conductive material such as Indium Tin Oxide (ITO), which is not limited herein.

In some examples, the insulating layer 130 may include, but is not limited to, an organic photoresist layer, and silicon oxide, silicon nitride, aluminum oxide, zirconium oxide, and the like. And, the first insulating layer opening and the second insulating layer opening may be prepared by a yellow-light etching process to expose the upper surface of the light emitting structure layer and the common voltage line.

In some examples, the second electrode 140 is used as a common electrode, which may have high penetration while having conductivity. In practical applications, the second electrode may be an ohmic contact layer matching the work function of the first doped layer, and may be made of metal such as nickel and gold, or may be made of transparent conductive material such as Indium Tin Oxide (ITO), which is not limited herein.

In some examples, one driving unit is further disposed in each sub-pixel. And, the driving unit is electrically connected to the first electrode 110 to input an electrical signal to the first electrode 110 and input an electrical signal to the second electrode 140, thereby actively driving the Micro LED to emit light. Further, the first electrodes 110 of the Micro LEDs are electrically connected to corresponding driving units, and the second electrodes 140 are electrically connected to the common voltage line 200 in a common electrode manner, so that each of the Micro LEDs can apply different image signals to the first electrodes 110 through the corresponding driving units to implement image display.

Referring to fig. 1 to 3, the display device according to the embodiment of the present invention further includes a plurality of common voltage lines 200 on the driving substrate 100. The common voltage line 200 is provided with a protrusion structure 210, and the protrusion structure 210 is provided with a protrusion opening KK1. The projection slit KK1 covers the orthographic projection of the first electrode 110 on the driving substrate 100 in the orthographic projection of the driving substrate 100, and a gap is formed between the boundary of the projection slit KK1 on the orthographic projection of the driving substrate 100 and the boundary of the covered first electrode 110 on the orthographic projection of the driving substrate 100. This allows the protrusion structure 210 of the common voltage line 200 to be disposed around the first electrode 110 and insulates the protrusion structure 210 from the first electrode 110, so that the occupied area of the common voltage line 200 may be increased. Since the insulating layer 130 has the second insulating layer opening KK2-2 exposing the common voltage line 200, the second electrode 140 may be electrically connected to the light emitting structure layer 120 through the first insulating layer opening KK2-1, and may also be electrically connected to the common voltage line 200 through the second insulating layer opening KK2-2, thereby interconnecting the common voltage line 200 and the second electrode 140, reducing the resistance of the second electrode 140, and reducing the IR Drop. Further, since the protrusion structure 210 is provided, when the second electrode 140 is electrically connected to the common voltage line 200 through the second insulating layer opening KK2-2, a contact area between the second electrode 140 and the common voltage line 200 may be increased, so that a resistance value of the second electrode 140 may be further reduced, and the IR Drop may be further reduced.

It should be noted that, referring to fig. 1 to 3, the insulating layer 130 is provided with a second insulating layer opening KK2-2 exposing the common voltage line 200, and the pattern thereof is substantially the same as that of the common voltage line 200, so that the entire region of the common voltage line 200 can be electrically connected to the second electrode 140 in direct contact, so that the common voltage line 200 can be electrically connected to the second electrode 140 in a large area as much as possible, rather than electrically connecting the second electrode 140 to the common voltage line 200 through a plurality of spaced through holes penetrating the insulating layer 130.

In some examples, referring to fig. 2a and 2b, the common voltage line 200 may be disposed at the same layer as the first electrode 110. That is, the common voltage line 200 and the first electrode 110 may be prepared using the same mask. Further, in order to reduce the resistance of the common voltage line 200, the thickness of the layer where the common voltage line 200 is located may be set between 100nm and 6 μm. For example, the thickness of the layer where the common voltage line 200 is located may be set to 100nm. The thickness of the layer on which the common voltage line 200 is located may also be set to 500nm. The thickness of the layer on which the common voltage line 200 is located may be set to 1 μm. The thickness of the layer on which the common voltage line 200 is located may be set to 3 μm. The thickness of the layer on which the common voltage line 200 is disposed may be set to 6 μm, which is not limited herein.

In some examples, referring to fig. 1 to 3, a plurality of first electrodes 110 may be arranged in the first direction F1 to form a repeating unit group CZ, and the repeating unit group CZ may be arranged in the second direction F2, so that the first electrodes 110 may be arranged in the display area AA in an array. That is, one first electrode 110 is provided for one sub-pixel, and the first electrodes 110 are dispersedly provided in the row direction and the column direction.

In some examples, referring to fig. 1 to 3, the common voltage line 200 may include: a transmission trace 220 and a protruding structure 210 electrically connected to each other; the transmission traces 220 extend along a first direction F1 and are arranged along a second direction F2. The transmission trace 220 may be disposed as a straight line extending in the first direction F1, and an orthographic projection of the transmission trace 220 on the driving substrate 100 is located in a gap between adjacent repeating unit groups CZ. In some examples, the first direction F1 may be a column direction and the second direction F2 may be a row direction. Alternatively, the first direction F1 may be a row direction, and the second direction F2 may be a column direction, which is not limited herein.

It should be noted that, in practical applications, due to limitations of process conditions, patterning requirements, or other factors, the transmission traces 220 may not be completely arranged in a straight line, and some deviations may occur, so that the arrangement manner of the transmission traces 220 only needs to substantially satisfy the above conditions, and all of them belong to the protection scope of the present invention. For example, the transmission trace 220 may be arranged in a straight line within an allowable error range.

In some examples, the projection arrangement 210 may be made to include an annular portion and a connecting portion. The annular portion has a protruding opening. For example, the protrusion opening may be circular, rectangular, oval or polygonal, and is not limited thereto.

Illustratively, referring to FIGS. 1-3, the projection arrangement 210 includes a ring portion 211 and two connection portions 212-1, 212-2. The ring portion 211 has a protruding opening KK1, so that the ring portion 211 is annularly disposed at the periphery of the orthographic projection of the corresponding first electrode 110 on the driving substrate 100 in the orthographic projection of the driving substrate 100. Also, the connection portions 212-1 and 212-2 extend along the second direction F2 to electrically connect the ring portion 211 and the transmission trace 220. Of course, in practical applications, the protrusion structure 210 may also include a plurality of ring portions 211 to further increase the contact area between the second electrode 140 and the common voltage line 200. The protruding structure 210 may also include a plurality of connection portions 212, such that when a connection portion 212 is broken, the ring portion 211 and the transmission trace 220 can be electrically connected through the remaining connection portions 212.

Illustratively, referring to fig. 1 and 3, an example of electrically connecting raised structures 210 disposed on both sides of a transmission trace 220 is shown. The projection opening KK1 of the projection structure 210 covers the orthographic projection of the transmission trace 220 adjacent to the orthographic projection of the first electrode 110 on the driving substrate 100, wherein the orthographic projection of the projection structure 210 on the driving substrate 100 is close to the transmission trace 220. Further, the protruding structure 210 may be arranged corresponding to the first electrode 110 that is nearest to the transmission trace 220.

Further, referring to fig. 1 and fig. 3, a plurality of protruding structures 210 arranged at intervals may be respectively disposed on two sides of each transmission trace 220. For example, each transmission trace 220 is electrically connected to the protruding structures 210 disposed on two sides thereof. Referring to fig. 1 and 3, two sides of the transmission trace 220 are respectively provided with a plurality of annular portions 211 arranged at intervals, and each transmission trace 220 is electrically connected to the annular portions 211 arranged at two sides thereof.

In some examples, referring to fig. 1 and 3, one repeating unit group CZ may be disposed between two adjacent transmission traces 220. In this way, one transmission line 220 is disposed in the gap between every two adjacent repeating unit groups CZ, so that the number of transmission lines 220 can be increased as much as possible, and the IR Drop can be further reduced.

Further, referring to fig. 1 and 3, the first electrodes 110 may be disposed in one-to-one correspondence with the protruding structures 210, and the protruding openings KK1 of the protruding structures 210 are annularly disposed on the periphery of the orthographic projection of the corresponding first electrodes 110 on the driving substrate 100 in the orthographic projection of the driving substrate 100. That is, each of the first electrodes 110 surrounds the annular portion 211 of one of the protruding structures 210. That is, a first electrode 110 is surrounded by an annular portion 211. The protruding structures 210 located on the same side of the transmission trace 220 are disposed in a one-to-one correspondence with the first electrodes 110 in one repeating unit group CZ. This allows a row of first electrodes 110 to be provided with a protrusion structure 210 in a one-to-one correspondence. This allows the ring portion 211 to be disposed as much as possible, so that the number of the protrusion structures 210 can be maximized to further increase the contact area between the second electrode and the common voltage line, further improve the uniformity of signal transmission, and further reduce the IR Drop.

In some examples, referring to fig. 1 and fig. 3, a plurality of protruding structures 210 arranged at intervals may be respectively disposed on two sides of each transmission trace 220, and the protruding structures 210 located on two sides of the transmission trace 220 may be arranged in a mirror image manner based on the transmission trace 220, so that the difficulty of patterning may be reduced.

In some examples, at least some adjacent transmission traces 220 can be made to share the projecting structure 210. For example, referring to fig. 1 and 3, each adjacent transmission trace 220 can share the protruding structure 210 therebetween. For example, the transmission trace 220-1 is electrically connected to the ring portion 211 through the connection portion 212-1, and the transmission trace 220-2 is electrically connected to the same ring portion 211 through the connection portion 212-2, that is, the protruding structure 210 can be electrically connected to the transmission trace 220-1, and can also be electrically connected to the transmission trace 220-2, so that more transmission traces 220 and the protruding structure 210 can be electrically connected to form a grid, thereby further reducing the IR Drop.

In some examples, referring to fig. 2a and 2b, a cross-section of the second insulating layer opening KK2-2 in a direction perpendicular to the plane S0 on which the driving substrate 100 is located has an inverted trapezoidal shape. In a direction parallel to the plane S0 of the driving substrate, a third thickness H3 is provided between a portion of the insulating layer 130 adjacent to the sidewall of the second insulating layer opening KK2-2, which is far away from the driving substrate 100, and the light emitting structure 120. In the insulating layer 130 adjacent to the sidewall of the second insulating layer slit KK2-2 in a direction parallel to the plane S0 of the driving substrate 100, a portion near one side of the driving substrate 100 and the light emitting structure 120 have a fourth thickness H4 therebetween. The third thickness H3 may be substantially the same as the fourth thickness H4. This makes it possible to uniformly arrange the second insulating layer slits KK 2-2.

In some examples, referring to fig. 2c, a cross section of the second insulating layer slit KK2-2 in a direction perpendicular to the plane S0 in which the driving substrate 100 is located is stepped. In a direction parallel to the plane S0 of the driving substrate 100, a first thickness H1 is formed between a portion of the step shape away from the driving substrate 100 and the light emitting structure 120. For example, in the insulating layer 130 adjacent to the sidewall of the second insulating layer opening KK2-2 in the direction parallel to the plane S0 of the driving substrate, a portion of the side away from the driving substrate 100 and the light emitting structure 120 have a first thickness H1 therebetween. In addition, in a direction parallel to the plane S0 of the driving substrate 100, a second thickness H2 is formed between a portion of the step shape close to the driving substrate 100 and the light emitting structure 120. For example, in the insulating layer 130 adjacent to the sidewall of the second insulating layer slit KK2-2 in a direction parallel to the plane S0 of the driving substrate 100, a portion of the side close to the driving substrate 100 and the light emitting structure 120 have a second thickness H2 therebetween. The first thickness H1 may be made smaller than the second thickness H2. At this time, the second electrode is on the upper portion of the light emitting structure layer 140 (e.g., N-polar region of the micro light emitting diode), and since the insulating layer 140 is very thin, an electric field E0 is generated, and the electric field E0 pushes the edge leakage current to flow to the central region of the light emitting structure layer (e.g., central region of the micro light emitting diode), so as to reduce the sidewall leakage current.

In some examples, the transmission trace may be bonded (bonding) with an external display driving chip to output a common voltage through the display driving chip, the common voltage being transmitted to the second electrode through the transmission trace.

According to the same inventive concept, the embodiment of the present invention provides a schematic structural diagram of another display device, as shown in fig. 4, which is modified with respect to the implementation manner in the above embodiment. Only the differences between the present embodiment and the above embodiments will be described below, and the same parts will not be described herein again.

Fig. 4 is a third schematic view of a top view structure of a display device according to an embodiment of the present invention.

In some examples, referring to fig. 4, the ring portions 211 located on the same side of the transmission trace 220 may be electrically connected by a connection line 300. In this way, the connecting lines are used to electrically connect the annular portions 211 arranged at intervals on the same side of the transmission trace 220, so that the transmission trace 220 and the annular portions 211 can further form a grid shape, the uniformity of signal transmission is further improved, and the IR Drop is further reduced.

In some examples, the connection line 300 may be disposed at the same layer as the transmission trace 220. That is, the connection line 300 and the first electrode 110 may be formed using the same mask.

According to the same inventive concept, the embodiment of the present invention provides a structural schematic diagram of still other display devices, as shown in fig. 5, which is modified from the implementation manner in the above embodiment. Only the differences between the present embodiment and the above embodiments will be described below, and the same parts will not be described herein again.

Fig. 5 is a fourth schematic view of a top view structure of a display device according to an embodiment of the invention.

In some examples, referring to fig. 5, two sides of each transmission trace 220 may be respectively provided with a plurality of protruding structures 210 arranged at intervals. The protruding structures 210 located on the same side of each transmission trace 220 are not all electrically connected to the transmission trace 220, but a portion of the protruding structures 210 located on the same side of each transmission trace 220 is electrically connected to the transmission trace 220. Further, a first electrode 110 may be disposed between the adjacent protruding structures 210 electrically connected to the same side of the transmission trace 220. Of course, two, three, or more first electrodes 110 may be disposed between the adjacent protruding structures 210 electrically connected to the same side of the transmission trace 220, which is not limited herein.

For example, for the convenience of patterning, the same number of first electrodes 110 may be disposed between the protruding structures 210 electrically connected to the same side of the transmission trace 220 and adjacent thereto.

In some examples, referring to fig. 5, the protruding structures 210 on both sides of the transmission trace 220 can be arranged in a staggered manner. Further, each transmission trace 220 and the protruding structures 210 electrically connected to two sides thereof may be repeatedly arranged.

In some examples, referring to fig. 5, the protruding structures 210 between two adjacent transmission traces 220 may not be shared, so that the patterning difficulty may be reduced.

According to the same inventive concept, the embodiment of the present invention provides a structural schematic diagram of still other display devices, as shown in fig. 6, which is modified from the embodiment in the above embodiment. Only the differences between the present embodiment and the above embodiments will be described below, and the descriptions of the same parts will be omitted.

Fig. 6 is a fifth schematic view of a top view structure of a display device according to an embodiment of the present invention.

In some examples, referring to fig. 6, a first electrode 110 can be disposed between the adjacent protruding structures 210 electrically connected to the same side of the transmission trace 220. Also, the protruding structures 210 located at both sides of the transmission trace 220 can be arranged in a mirror image based on the transmission trace 220 electrically connected thereto. Further, the even-numbered transmission lines 220 and the protruding structures 210 electrically connected to both sides thereof can be repeatedly arranged. The transmission traces 220 in the odd columns and the protruding structures 210 electrically connected to both sides thereof are repeatedly arranged. And, the protruding structures 210 electrically connected to both sides of the transmission trace 220 in the even and odd columns are arranged in a staggered manner.

According to the same inventive concept, the embodiment of the present invention provides a schematic structural diagram of still other display devices, as shown in fig. 7, which is modified from the embodiment in the above embodiment. Only the differences between the present embodiment and the above embodiments will be described below, and the descriptions of the same parts will be omitted.

Fig. 7 is a sixth schematic view of a top view structure of a display device according to an embodiment of the present invention.

In some examples, referring to fig. 7, one side of each transmission trace 220 may be provided with a plurality of protruding structures 210 arranged at intervals. For example, each transmission trace 220 is electrically connected to the protruding structure 210 disposed on the same side. Further, each transmission trace 220 and the protruding structures 210 electrically connected thereto may be repeatedly arranged.

According to the same inventive concept, the embodiment of the present invention provides a structural schematic diagram of still other display devices, as shown in fig. 8, which is modified from the embodiment in the above embodiment. Only the differences between the present embodiment and the above embodiments will be described below, and the same parts will not be described herein again.

Fig. 8 is a seventh schematic top view of a display device according to an embodiment of the present invention.

In some examples, referring to fig. 8, two repeating cell group CZ may be disposed between two adjacent transmission traces 220. Of course, three, four or more repeating unit groups CZ may be disposed between two adjacent transmission lines 220, which is not limited herein.

According to the same inventive concept, the embodiment of the present invention provides a schematic structural diagram of still other display devices, as shown in fig. 9, which is modified from the embodiment in the foregoing embodiment. Only the differences between the present embodiment and the above embodiments will be described below, and the descriptions of the same parts will be omitted.

Fig. 9 is a seventh schematic top view of a display device according to an embodiment of the invention.

In some examples, referring to fig. 9, the tab structure 210 may be a full-layer structure having a plurality of tab openings KK1. That is, the protruding structure 210 and the transmission trace 220 are as a whole layer structure with a protruding opening. For example, in the manufacturing process, a common voltage film layer is formed first, then the common voltage film layer is patterned, and the projection opening KK1 is etched to form the whole layer of the projection structure 210 and the transmission trace 220.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

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

Claims

1. A display device, comprising:

a drive substrate;

a plurality of common voltage lines on the driving substrate; wherein the common voltage line has a protrusion structure; the protruding structure has a protruding opening;

a plurality of first electrodes on the driving substrate; wherein the orthographic projection of the protrusion opening on the driving substrate covers the orthographic projection of the first electrode on the driving substrate, and a gap is formed between the boundary of the orthographic projection of the protrusion opening on the driving substrate and the boundary of the covered orthographic projection of the first electrode on the driving substrate;

the light emitting structure layers are positioned on one side, away from the driving substrate, of the first electrode; wherein one of the light emitting structure layers is electrically connected to one of the first electrodes;

the insulating layer is positioned on one side, away from the driving substrate, of the light emitting structure layer; wherein the insulating layer has a first insulating layer opening exposing the light emitting structure layer and a second insulating layer opening exposing the common voltage line;

the whole layer of the second electrode is arranged on one side, away from the driving substrate, of the insulating layer; wherein the second electrode is electrically connected to the light emitting structure layer through the first insulating layer opening, and the second electrode is electrically connected to the common voltage line through the second insulating layer opening.

2. The display device according to claim 1, wherein the common voltage line includes: the transmission routing and the protruding structure are electrically connected with each other; the transmission routing lines extend along a first direction and are arranged along a second direction;

the plurality of first electrodes are arranged along the first direction to form a repeating unit group, and the repeating unit group is arranged along the second direction;

the orthographic projection of the transmission routing line on the driving substrate is positioned in a gap between the adjacent repeating unit groups;

the protruding structure is positioned on at least one side of the transmission routing; and the orthographic projection of the projection opening on the driving substrate covers the orthographic projection of the first electrode adjacent to the transmission wiring electrically connected with the projection opening on the driving substrate.

3. The display apparatus of claim 2, wherein the protruding structure comprises at least one annular portion and at least one connecting portion; wherein the annular portion has the projection opening; the connecting part extends along the second direction to electrically connect the annular part and the transmission routing.

4. The display device according to claim 3, wherein a plurality of protruding structures are disposed on two sides of the transmission trace respectively, and are arranged at intervals;

at least one first electrode is electrically connected to the same side of the transmission wiring and arranged between the adjacent protruding structures; or the first electrodes and the protruding structures are arranged in a one-to-one correspondence manner.

5. The display device of claim 4, wherein the protruding structures on both sides of the transmission traces are arranged in a mirror image or staggered manner based on the transmission traces.

6. The display device of claim 4, wherein the loop portions on the same side of the transmission traces are electrically connected by a connection line.

7. The display device of claim 2, wherein the protrusion structure is a full-layer structure having a plurality of protrusion openings.

8. The display device according to any one of claims 2 to 7, wherein at least one of the repeating unit groups is disposed between two adjacent transmission traces; and/or at least part of adjacent transmission tracks share the convex structure.

9. The display apparatus according to any one of claims 1 to 7, wherein the layer on which the common voltage line is provided has a thickness of 100nm to 6 μm.

10. The display device according to any one of claims 1 to 7, wherein the second insulating layer opening is stepped in cross section in a direction perpendicular to a plane of the drive substrate; in the direction parallel to the plane of the driving substrate, a first thickness is formed between the part, far away from one side of the driving substrate, in the ladder shape and the light-emitting structure; in the direction parallel to the plane of the driving substrate, a second thickness is formed between the part, close to one side of the driving substrate, in the ladder shape and the light-emitting structure; the first thickness is less than the second thickness.