Display panel

Abstract

The application provides a display panel, which comprises a driving circuit layer, a light emitting unit and a leakage current guiding structure. The leakage current guiding structure separates the anodes of adjacent light emitting units. The leakage current between the anodes is guided to the anode shielding structure by the leakage current guiding structure, so that the phenomenon of light stealing caused by the leakage current between the anodes is avoided, the color deviation of the display panel at a low gray scale is improved, and the brightness uniformity of the display panel is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display panel. BACKGROUND

[0002] OLED (Organic Light-Emitting Diode) display technology has become the most popular display type at present, because it has the characteristics of self-luminous, wide viewing angle, high contrast, low power consumption, extremely high response speed, and can be applied to flexible display.

[0003] In the existing OLED display panel, a capacitor is formed between the anodes of adjacent light emitting units due to different potentials. When the potential of the anode changes, a leakage current is formed between the adjacent anodes. Because the turn-on voltage of the OLED light emitting material is low, when the thin film transistor is off or at 0 gray scale, the leakage current will make the light emitting unit that should not emit light emit light, resulting in the phenomenon of low gray scale light stealing, which causes the display panel to have color deviation and uneven brightness at low gray scale.

[0004] In summary, the existing display panel has the problem of leakage current between the anodes of adjacent light emitting units. Therefore, it is necessary to provide a display panel to improve this defect. SUMMARY

[0005] The embodiments of the present application provide a display panel, which can solve the problem of leakage current between the anodes of adjacent light emitting units, thereby improving the color deviation problem of the display panel at low gray scale and improving the brightness uniformity of the display panel.

[0006] The embodiments of the present application provide a display panel, comprising:

[0007] A driving circuit layer, a plurality of anode shielding structures are arranged in the driving circuit layer;

[0008] A plurality of light emitting units are arranged on the driving circuit layer, and the light emitting units comprise anodes;

[0009] A plurality of leakage guiding structures are arranged in the same layer as the anodes, the leakage guiding structures and the anodes are arranged in insulation with each other, at least part of the adjacent anodes are spaced apart by the leakage guiding structures, and the leakage guiding structures are electrically connected to the anode shielding structures.

[0010] According to an embodiment of the present application, the leakage guiding structure is a closed ring structure, and surrounds a corresponding anode.

[0011] According to an embodiment of the present application, any two adjacent leakage guiding structures are arranged in insulation with each other.

[0012] According to an embodiment of the present application, the light-emitting units include red light-emitting units, green light-emitting units and blue light-emitting units, and the conductive leakage structure is arranged between the anodes of at least two adjacent types of the light-emitting units among the red light-emitting units, the green light-emitting units and the blue light-emitting units.

[0013] According to an embodiment of the present application, the anodes of at least one type of the light-emitting units among the red light-emitting units, the green light-emitting units and the blue light-emitting units are provided with the conductive leakage structure.

[0014] According to an embodiment of the present application, the display panel further includes a pixel definition layer, and the pixel definition layer has a plurality of conductive leakage openings, the conductive leakage openings penetrating through the pixel definition layer in the thickness direction of the display panel and exposing the conductive leakage structure.

[0015] According to an embodiment of the present application, the driving circuit layer includes a source electrode, a drain electrode and a bonding electrode, and the bonding electrode is arranged in the same layer as the source electrode and the drain electrode.

[0016] The bonding electrode is in contact with the conductive leakage structure and the anode shielding structure, respectively.

[0017] According to an embodiment of the present application, the potential of the anode shielding structure is different from the potential of the adjacent anode in the same time sequence.

[0018] According to an embodiment of the present application, the driving time sequence of the display panel includes an initial stage, a compensation stage and a light-emitting stage.

[0019] In the initial stage and the compensation stage, the potential of the anode shielding structure is maintained at a high power supply potential.

[0020] In the light-emitting stage, the potential of the anode shielding structure is maintained at any one of a reset potential, a ground potential or a low power supply potential.

[0021] According to an embodiment of the present application, the display panel further includes a thin film transistor shielding structure, and the thin film transistor shielding structure is arranged in the same layer as the anode shielding structure.

[0022] In the initial stage and the compensation stage, the potential of the thin film transistor shielding structure is maintained at the high power supply potential.

[0023] In the light-emitting stage, the potential of the thin film transistor shielding structure is maintained at any one of the high power supply potential, the reset potential, the ground potential or the low power supply potential.

[0024] The embodiment of the present application provides a display panel, which comprises a driving circuit layer, a plurality of light emitting units and a plurality of leakage current conducting structures, a plurality of anode shielding structures are arranged in the driving circuit layer, the light emitting unit is arranged on the driving circuit layer, the light emitting unit comprises an anode, the leakage current conducting structure and the anode are arranged in the same layer, the leakage current conducting structure and the anode are arranged in insulation with each other, and at least part of adjacent anodes are spaced apart, the leakage current conducting structure is electrically connected to the anode shielding structure, the leakage current between the anodes is conducted to the anode shielding structure through the leakage current conducting structure, the leakage current between the anodes of adjacent light emitting units can be avoided, the phenomenon of light stealing caused by the leakage current between the anodes can be avoided, and therefore the color deviation of the display panel under a low gray scale can be improved, and the brightness uniformity of the display panel is improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0026] Figure 1 The first display panel provided by the embodiment of the present application is shown in the plane view.

[0027] Figure 2 The display panel provided by the embodiment of the present application is shown in the cross-sectional view along the A-A direction.

[0028] Figure 3 The second display panel provided by the embodiment of the present application is shown in the plane view.

[0029] Figure 4 The third display panel provided by the embodiment of the present application is shown in the plane view.

[0030] Figure 5 The fourth display panel provided by the embodiment of the present application is shown in the plane view.

[0031] Figure 6 The fifth display panel provided by the embodiment of the present application is shown in the plane view.

[0032] Figure 7 The first timing diagram provided by the embodiment of the present application is shown in the plane view.

[0033] Figure 8 The second timing diagram provided by the embodiment of the present application is shown in the plane view. DETAILED DESCRIPTION

[0034] The following description of the embodiments is presented in reference to the figures, which are meant to illustrate particular embodiments in which the present application can be practiced. Directional terms, such as [up], [down], [front], [back], [left], [right], [inner], [outer], [side] and the like, are used with reference to the orientation of the figures. Thus, the directional terms are used for purposes of explanation and illustration and not limitation. In the figures, similar elements are designated with identical reference numerals.

[0035] The present application is further described below with reference to the accompanying drawings and specific embodiments.

[0036] The display panel provided by the embodiments of the present application can solve the problem of leakage current between adjacent anodes of light-emitting units, thereby improving the color cast of the display panel at low gray scales and improving the brightness uniformity of the display panel.

[0037] In combination with Figure 1 and Figure 2 shown, Figure 1 a first display panel provided by the embodiments of the present application, Figure 2 A cross-sectional view of a display panel provided by the embodiments of the present application along the A-A direction, the display panel 100 includes a substrate 10, a driving circuit layer 20, a plurality of light-emitting units 30, and a plurality of leakage-conducting structures 40, the driving circuit layer 20 is disposed on the substrate 10. It should be noted that disposed on the substrate 10 can mean directly contacting the substrate 10 or indirectly contacting the substrate 10.

[0038] In one of the embodiments, the substrate 10 includes a first flexible substrate 11, a first buffer layer 12, a second flexible substrate 13, and a second buffer layer 14, the first buffer layer 12 is disposed between the first flexible substrate 11 and the second flexible substrate 13, and the second buffer layer 14 is disposed on a side of the second flexible substrate 13 away from the first buffer layer 12.

[0039] In one of the embodiments, the materials of the first flexible substrate 11 and the second flexible substrate 13 can both be flexible transparent organic materials, which can be but are not limited to polyimide.

[0040] In one of the embodiments, the materials of the first buffer layer 12 and the second buffer layer 14 can both be any one or a combination of materials of silicon nitride, silicon oxide, or silicon oxynitride.

[0041] In one of the embodiments, the driving circuit layer 20 is provided with a plurality of anode shielding structures BSM1.

[0042] As Figure 2As shown, the driving circuit layer 20 comprises a shielding layer 21, a third buffer layer 22, a barrier layer 23, an active layer 24, a first gate insulating layer GI1, a first gate metal layer GE1, a second gate insulating layer GI2, a second gate metal layer GE2, an interlayer dielectric layer ILD, a source-drain electrode metal layer 25 and a planarization layer PLN which are sequentially stacked on the substrate 10.

[0043] The third buffer layer 22 can be made of any one or a combination of silicon nitride, silicon oxide or silicon oxynitride.

[0044] In one embodiment, the third buffer layer 22 can be made of the same material as the first buffer layer 12 and the second buffer layer 14.

[0045] The barrier layer 23 is a composite film layer structure formed by sequentially stacking a silicon oxide film layer and a silicon nitride film layer, and the silicon nitride film layer can be arranged on the side of the silicon oxide film layer away from the substrate 10.

[0046] The active layer 24 is arranged on the side of the barrier layer 23 away from the substrate 10, and the active layer 24 can be a polysilicon structure.

[0047] The shielding layer 21 is provided with a plurality of anode shielding structures BSM1, and the plurality of anode shielding structures BSM1 are arranged at intervals.

[0048] The light emitting unit 30 is arranged on the driving circuit layer 20, and the plurality of light emitting units 30 can be arranged in an array on the side surface of the driving circuit layer 20 away from the substrate 10.

[0049] In the embodiments of the present application, the display panel is an OLED display panel, and the light emitting unit 30 can be an organic light emitting diode.

[0050] The light emitting unit 30 can comprise an anode 31, a light emitting layer 32 and a cathode layer (not shown in the figure), and the anode 31 is arranged on the side surface of the planarization layer PLN away from the substrate 10.

[0051] The display panel can further comprise a pixel definition layer 33 arranged on the side surface of the planarization layer away from the substrate 10, and the pixel definition layer 33 is provided with a plurality of pixel openings 331, the pixel openings 331 penetrating the pixel definition layer 33 in the thickness direction of the display panel and exposing the anode 31.

[0052] The light-emitting layer 32 can include an organic light-emitting material layer 321 and a common layer (not shown in the figure), which can include but is not limited to a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer stacked on the pixel definition layer. The common layer is tiled on the side surface of the pixel definition layer away from the substrate 10, and is continuously arranged at the pixel opening 331, covering the anode 31 at the bottom of the pixel opening 331 and the sidewall of the pixel opening 331. The organic light-emitting material layer 321 can be arranged between the hole transport layer and the electron transport layer, and arranged in the pixel opening 331. The cathode is tiled on the side surface of the common layer away from the substrate 10.

[0053] Further, the drain leakage structure 40 and the anode 31 are arranged in the same layer, and the drain leakage structure 40 and the anode 31 are arranged in insulation with each other and separate at least part of the adjacent anodes 31, and the drain leakage structure 40 is electrically connected to the anode shielding structure BSM1.

[0054] As shown in Figure 2 , the plurality of drain leakage structures 40 and the anode 31 are arranged on the side surface of the planar layer away from the substrate 10, and the material of the drain leakage structure 40 can be the same as the material of the anode 31. In actual preparation process, the same patterning process can be used to simultaneously prepare the drain leakage structure 40 and the anode 31.

[0055] As shown in Figure 2 , the drain leakage structure 40 and the adjacent anode 31 are separated by the pixel definition layer 33 and arranged in insulation with each other, and the adjacent two anodes 31 are separated by the drain leakage structure 40.

[0056] Further, the drive circuit layer 20 further includes a lap joint electrode 253, and the lap joint electrode 253 respectively contacts the drain leakage structure 40 and the anode shielding structure BSM1.

[0057] The lap joint electrode 253 is arranged between the interlayer dielectric layer ILD and the planar layer PLN, and the drain leakage structure 40 passes through the planar layer PLN and contacts the lap joint electrode 253.

[0058] The lap electrode 253 passes sequentially through the interlayer dielectric layer ILD, the second gate insulating layer GI2, the first gate insulating layer GI1, the barrier layer 23, and the third buffer layer 22, and contacts the anode shielding structure BSM1. In this way, the leakage current of the adjacent anodes 31 can be guided to the anode shielding structure BSM1 through the leakage current conducting structure 40 and the lap electrode 253, avoiding the formation of leakage current between the anodes 31 of adjacent light-emitting units 30. This prevents the light-emitting units 30 that should not emit light from being lit by the leakage current between the anodes 31, thereby improving the color deviation problem of the display panel at low gray levels and improving the brightness uniformity of the display panel at low gray levels.

[0059] In one embodiment, the source / drain electrode metal layer 25 includes a source electrode 251 and a drain electrode 252, and the lap electrode 253 is disposed on the same layer as the source electrode 251 and the drain electrode 252, and is made of the same material as the source electrode 251 and the drain electrode 252.

[0060] In the actual fabrication process, the same patterning process can be used to simultaneously fabricate the source electrode 251, the drain electrode 252, and the bridging electrode 253.

[0061] In one embodiment, the light-emitting unit 30 includes a red light-emitting unit 301, a green light-emitting unit 302, and a blue light-emitting unit 303, and the leakage current conducting structure 40 is disposed between the anodes 31 of at least two adjacent types of light-emitting units among the red light-emitting unit 301, the green light-emitting unit 302, and the blue light-emitting unit 303.

[0062] like Figure 1 As shown, a leakage current conducting structure 40 is provided between the red light-emitting unit 301 and the green light-emitting unit 302. The leakage current conducting structure 40 is elongated and can separate the anode 31 of the red light-emitting unit 301 and the anode 31 of the green light-emitting unit 302. The leakage current conducting structure 40 can guide the leakage current of the anode 31 of the red light-emitting unit 301 or the green light-emitting unit 302 to the anode shielding structure BSM1, thereby avoiding leakage current between the anode 31 of the red light-emitting unit 301 and the anode 31 of the green light-emitting unit 302.

[0063] The green light emitting unit 302 and the blue light emitting unit 303 are provided with a leakage current conducting structure 40, the leakage current conducting structure 40 is in a strip shape, the leakage current conducting structure 40 can separate the anode 31 of the green light emitting unit 302 and the anode 31 of the blue light emitting unit 303, the leakage current conducting structure 40 can conduct the leakage current of the anode 31 of the green light emitting unit 302 or the blue light emitting unit 303 to the anode shielding structure BSM1, so that the leakage current between the anode 31 of the green light emitting unit 302 and the anode 31 of the blue light emitting unit 303 can be avoided.

[0064] In one embodiment, when the influence of the leakage current between the anodes of the green light emitting unit 302 and the blue light emitting unit 303 can be ignored and does not cause the problem of light stealing of the light emitting unit, a leakage current conducting structure 40 can be only provided between the adjacent red light emitting unit 301 and the green light emitting unit 302, and no leakage current conducting structure 40 can be provided between the adjacent green light emitting unit 302 and the blue light emitting unit 303.

[0065] In other embodiments, according to the leakage current of the display panel during operation, the leakage current conducting structure 40 can be only provided between the anodes of the adjacent red light emitting unit 301 and the blue light emitting unit 303, or the leakage current conducting structure 40 can be only provided between the anodes of the adjacent green light emitting unit 302 and the blue light emitting unit 303, so that the problem of light stealing caused by the leakage current between the anodes of the adjacent light emitting units can also be improved.

[0066] In one embodiment, the leakage current conducting structure 40 is a closed ring structure and surrounds the corresponding anode 31.

[0067] As shown in FIG. 1, Figure 3 As shown in FIG. 1, Figure 3 A second display panel provided by the embodiment of the present application is shown in FIG. 1, taking the green light emitting unit 302 as an example, the leakage current conducting structure 40 is a closed ring structure, the leakage current conducting structure 40 can fully surround the anode 31 in the green light emitting unit 302, so as to separate the anode 31 in the green light emitting unit 302 and the anodes of the other light emitting units adjacent thereto, avoid the formation of leakage current between the anode 31 in the green light emitting unit 302 and the anodes of the other light emitting units adjacent thereto, and thus the light stealing caused by the leakage current between the light emitting units 30 can be avoided. Figure 1 As shown in FIG. 1,

[0068] Further, the anode 31 of the light emitting unit of at least one of the red light emitting unit 301, the green light emitting unit 302, and the blue light emitting unit 303 is provided with the leakage prevention structure 40.

[0069] In one embodiment, as shown in FIG. 2, the anode 31 of the green light emitting unit 302 is provided with a ring of the leakage prevention structure 40, and the anodes 31 of the red light emitting unit 301 and the blue light emitting unit 303 are not provided with the leakage prevention structure 40. In this way, the anode 31 of the green light emitting unit 302 can be prevented from generating a leakage current flowing to the anodes 31 of the red light emitting unit 301 or the blue light emitting unit 303. This embodiment is applicable to a case where only the anode 31 of the green light emitting unit 302 generates a leakage current flowing to the anodes 31 of the red light emitting unit 301 or the blue light emitting unit 303. Figure 3

[0070] In one embodiment, as shown in FIG. 3, the anode 31 of the red light emitting unit 301 is provided with a ring of the leakage prevention structure 40, and the anodes 31 of the green light emitting unit 302 and the blue light emitting unit 303 are not provided with the leakage prevention structure 40. In this way, the anode 31 of the red light emitting unit 301 can be prevented from generating a leakage current flowing to the anodes 31 of the green light emitting unit 302 or the blue light emitting unit 303. This embodiment is applicable to a case where only the anode 31 of the red light emitting unit 301 generates a leakage current flowing to the anodes 31 of the green light emitting unit 302 or the blue light emitting unit 303. Figure 4 Figure 4 A third display panel provided by an embodiment of the present application is shown in FIG. 4. The anode 31 of the red light emitting unit 301 is provided with a ring of the leakage prevention structure 40, and the anodes 31 of the green light emitting unit 302 and the blue light emitting unit 303 are not provided with the leakage prevention structure 40. In this way, the anode 31 of the red light emitting unit 301 can be prevented from generating a leakage current flowing to the anodes 31 of the green light emitting unit 302 or the blue light emitting unit 303. This embodiment is applicable to a case where only the anode 31 of the red light emitting unit 301 generates a leakage current flowing to the anodes 31 of the green light emitting unit 302 or the blue light emitting unit 303.

[0071] In one embodiment, as shown in FIG. 5, the anodes 31 of the red light emitting unit 301 and the green light emitting unit 302 are each provided with a ring of the leakage prevention structure 40, and the anode 31 of the blue light emitting unit 303 is not provided with the leakage prevention structure 40. In this way, the anodes 31 of the red light emitting unit 301 and the green light emitting unit 302 can be prevented from generating a leakage current flowing to the anode 31 of the blue light emitting unit 303. This embodiment is applicable to a case where only the anodes 31 of the red light emitting unit 301 and the green light emitting unit 302 generate a leakage current flowing to the anode 31 of the blue light emitting unit 303. Figure 5 Figure 5 A fourth display panel provided by an embodiment of the present application is shown in FIG. 6. The anodes 31 of the red light emitting unit 301 and the green light emitting unit 302 are each provided with a ring of the leakage prevention structure 40, and the anode 31 of the blue light emitting unit 303 is not provided with the leakage prevention structure 40. In this way, the anodes 31 of the red light emitting unit 301, the green light emitting unit 302, and the blue light emitting unit 303 can be prevented from generating a leakage current flowing to the anodes 31 of other light emitting units. This embodiment is applicable to a case where only the anodes 31 of the red light emitting unit 301, the green light emitting unit 302, and the blue light emitting unit 303 generate a leakage current flowing to the anodes 31 of other light emitting units.

[0072] In one embodiment, as shown in FIG. 7, the anodes 31 of the red light emitting unit 301, the green light emitting unit 302, and the blue light emitting unit 303 are each provided with a ring of the leakage prevention structure 40. In this way, the anodes 31 of the red light emitting unit 301, the green light emitting unit 302, and the blue light emitting unit 303 can be prevented from generating a leakage current flowing to the anodes 31 of other light emitting units. This embodiment is applicable to a case where the anodes 31 of the red light emitting unit 301, the green light emitting unit 302, and the blue light emitting unit 303 generate a leakage current flowing to the anodes 31 of other light emitting units. Figure 6 Figure 6 ​​​​This is a plan view of the fifth type of display panel provided in the embodiments of this application. The anode 31 of the red light-emitting unit 301, the anode 31 of the green light-emitting unit 302, and the anode 31 of the blue light-emitting unit 303 are all surrounded by a ring of the leakage current conducting structure 40. This can also prevent the anode 31 of the red light-emitting unit 301, the green light-emitting unit 302, or the blue light-emitting unit 303 from generating leakage current to the anode 31 of other light-emitting units, and can also prevent leakage current between the anodes 31 of adjacent light-emitting units of the same type.

[0073] Furthermore, any two adjacent conductive leakage structures 40 are mutually insulated.

[0074] like Figure 6 As shown, the conductive leakage structure 40 corresponding to the red light-emitting unit 301 and the conductive leakage structure 40 corresponding to the green light-emitting unit 302 are spaced apart and insulated from each other. The conductive leakage structure 40 corresponding to the green light-emitting unit 302 and the conductive leakage structure 40 corresponding to the green light-emitting unit 302 are spaced apart and insulated from each other. This can avoid crosstalk between adjacent conductive leakage structures 40.

[0075] In one embodiment, such as Figure 2 As shown, the pixel definition layer 33 has a plurality of leakage openings 332. In the thickness direction of the display panel, the leakage openings 332 penetrate the pixel definition layer 33 and expose the leakage structure 40.

[0076] The common layer can be disposed within the leakage opening 332 and in contact with the side surface of the leakage structure 40 facing away from the substrate 10.

[0077] In one embodiment, the pixel definition layer 33 may only have pixel openings 331 without leakage openings 332, and the pixel definition layer 33 may completely cover the leakage structure 40.

[0078] Furthermore, within the same time sequence, the potential of the anode shielding structure BSM1 is different from the potential of the adjacent anode 31.

[0079] The driving timing of the display panel includes an initial stage t1, a compensation stage t2, and an emission stage t3. In the initial stage t1 and the compensation stage t2, the potential of the anode shielding structure BSM1 is maintained at the high power supply potential VDD. In the emission stage t3, the potential of the anode shielding structure BSM1 is maintained at any one of the reset potential VI, the ground potential GND, or the low power supply potential VSS.

[0080] In one embodiment, such asFigure 7 As shown, Figure 7 In the first timing diagram provided by the embodiments, the potential of the anode shielding structure BSM1 can be kept at the power supply high potential VDD in the initial stage t1 and the compensation stage t2, and the potential of the anode shielding structure BSM1 can be kept at the reset potential VI in the light-emitting stage t3. The reset potential VI is a negative potential. When the lateral leakage occurs in the anode, the reset potential VI can neutralize the carriers of the leakage current, so that the light-emitting unit which should not emit light between the light-emitting units is prevented from being turned on, thereby reducing the occurrence of the light stealing.

[0081] In other embodiments, the potential of the anode shielding structure BSM1 can be kept at the power supply high potential VDD in the initial stage t1 and the compensation stage t2, and the potential of the anode shielding structure BSM1 can be kept at the ground potential GND or the power supply potential VSS in the light-emitting stage t3. In this way, the light-emitting unit which should not emit light between the light-emitting units is also prevented from being turned on, thereby reducing the occurrence of the light stealing.

[0082] In one of the embodiments, the display panel further comprises a thin film transistor shielding structure BSM2, and the thin film transistor shielding structure BSM2 and the anode shielding structure BSM1 are disposed on the same layer.

[0083] As shown, Figure 2 The thin film transistor shielding structure BSM2 and the anode shielding structure BSM1 are disposed on the shielding layer 21. The source-drain electrode metal layer 25 further comprises an auxiliary electrode 254 which passes through the interlayer dielectric layer ILD, the second gate insulating layer GI2, the first gate insulating layer GI1, the barrier layer 23 and the third buffer layer 22, and contacts the thin film transistor shielding structure BSM2.

[0084] Further, in the initial stage t1 and the compensation stage t2, the potential of the thin film transistor shielding structure BSM2 is kept at the power supply high potential VDD; in the light-emitting stage t3, the potential of the thin film transistor shielding structure BSM2 is kept at any one of the power supply high potential VDD, the reset potential VI, the ground potential GDN or the power supply low potential VSS.

[0085] In one of the embodiments, as shown, Figure 7As shown, in the initial stage t1 and the compensation stage t2, the potential of the thin-film transistor shielding structure BSM2 is maintained at the high power supply potential VDD, thus ensuring the orderly operation of the thin-film transistor and the entire pixel circuit. In the light-emitting stage t3, the potential of the thin-film transistor shielding structure BSM2 is still maintained at the high power supply potential VDD, thus preventing brightness changes caused by the loss of compensation information in the pixel circuit due to potential changes in the thin-film transistor shielding structure BSM2.

[0086] In one embodiment, such as Figure 8 As shown, Figure 8 In the second timing diagram provided in this application embodiment, during the initial stage t1 and the compensation stage t2, the potential of the thin-film transistor shielding structure BSM2 is maintained at the high power supply potential VDD, thus ensuring the orderly operation of the thin-film transistor and the entire pixel circuit. During the light-emitting stage t3, the potential of the thin-film transistor shielding structure BSM2 can be maintained at the reset potential VI. Since the potential change of the thin-film transistor shielding structure BSM2 can cause a change in the current of the pixel circuit, reducing the current of the pixel circuit and thus reducing the current applied to the corresponding anode, the reset potential VI of the anode shielding structure BSM1 can neutralize the carriers of the leakage current, thereby further improving the problem of insufficient light emission.

[0087] In some other embodiments, during the initial stage t1 and the compensation stage t2, the potential of the thin-film transistor shielding structure BSM2 is maintained at the high power supply potential VDD. During the light-emitting stage t3, the potential of the thin-film transistor shielding structure BSM2 can also be maintained at the ground potential GND or the low power supply potential VSS. This can also reduce the current of the pixel circuit during the light-emitting stage t3, thereby reducing the current applied to the corresponding anode and further improving the problem of light leakage.

[0088] Based on the display panel provided in the above embodiments of this application, this application also provides a method for manufacturing a display panel. This method can be used to manufacture the display panel provided in the above embodiments, in conjunction with... Figure 2 As shown, the method for manufacturing the display panel includes:

[0089] Step S1: A first flexible substrate 11, a first buffer layer 12, and a second flexible substrate 13 are sequentially formed on a glass substrate.

[0090] Step S2: A second buffer layer 14 is formed on the second flexible substrate 13, and a shielding layer 21 is formed on the second buffer layer 14.

[0091] The film thickness of the second buffer layer 14 in the step S2 can be less than or equal to 1000 angstroms. For example, the film thickness of the second buffer layer 14 can be, but is not limited to, 1000 angstroms, 800 angstroms, 600 angstroms, or 500 angstroms, etc.

[0092] Step S3: The shielding layer 21 is patterned to form a plurality of anode shielding structures BSM1 and thin film transistor shielding structures BSM2.

[0093] Step S4: A third buffer layer 22 is formed on the second buffer layer 14, and the third buffer layer 22 covers the shielding layer 21.

[0094] In the step S4, the material, thickness, and film forming conditions of the third buffer layer 22 can be consistent with those of the second buffer layer 14.

[0095] Step S5: A barrier layer 23 and an active layer 24 are formed on the third buffer layer 22.

[0096] Step S6: The active layer 24 is subjected to excimer laser annealing (ELA) to form a polysilicon structure.

[0097] Step S7: A first gate insulating layer GI1 is formed on the active layer 24.

[0098] Step S8: A first gate metal layer GE1 is formed on the first gate insulating layer GI1, and the first gate metal layer GE1 is patterned to form a plurality of patterned first gates.

[0099] Step S9: A second gate insulating layer GI2 is formed on the first gate metal layer GE1.

[0100] Step S10: A second gate metal layer GE2 is formed on the second gate insulating layer GI2, and the second gate metal layer GE2 is patterned to form a plurality of patterned second gates, which are arranged opposite to the first gates to form a storage capacitor.

[0101] Step S11: An interlayer dielectric layer ILD is formed on the second gate metal layer GE2.

[0102] Step S12: A plurality of vias are formed on the interlayer dielectric layer ILD, and the plurality of vias respectively expose the active layer 24, the anode shielding structures BSM1, and the thin film transistor shielding structures BSM2.

[0103] Step S13: forming a source-drain electrode metal layer 25 on the interlayer dielectric layer ILD, and patterning the source-drain electrode metal layer 25 to form a source electrode 251, a drain electrode 252, an overlap electrode 253, and an auxiliary electrode 254.

[0104] Step S14: forming a planarization layer PLN on the source-drain electrode metal layer 25.

[0105] Step S15: depositing an electrode material on the planarization layer PLN, and patterning the electrode material to form a plurality of patterned anodes 31 and a conductive leakage structure 40.

[0106] Step S16: forming a pixel definition layer 33 on the anodes 31 and the conductive leakage structure 40, and patterning the pixel definition layer 33 to form a plurality of pixel openings 331 and a conductive leakage opening 332.

[0107] In the step S16, the width of the pixel opening 331 can be greater than the width of the conductive leakage opening 332, so that the area of the light-emitting region in the light-emitting unit 30 is greater than the area of the non-light-emitting region.

[0108] Step S17: forming a light-emitting layer 32 and a cathode on the pixel definition layer 33.

[0109] The display panel provided by the embodiments of the present application includes a driving circuit layer, a plurality of light-emitting units, and a plurality of conductive leakage structures. The driving circuit layer is provided with a plurality of anode shielding structures. The light-emitting units are arranged on the driving circuit layer, and each light-emitting unit includes an anode. The conductive leakage structures and the anodes are arranged on the same layer, and are arranged to be insulated from each other and to separate at least part of the adjacent anodes. The conductive leakage structures are electrically connected to the anode shielding structures. The conductive leakage structures can guide the leakage current between the anodes to the anode shielding structures, so that the leakage current between the anodes of adjacent light-emitting units can be avoided, and the phenomenon of light stealing caused by the leakage current between the anodes can be avoided. Thus, the color deviation of the display panel at low gray levels can be improved, and the brightness uniformity of the display panel can be improved.

[0110] To sum up, although the preferred embodiments are disclosed as above, the above-mentioned preferred embodiments are not used to limit the present application, and any modification and improvement made by those skilled in the art without departing from the spirit and scope of the present application shall fall within the scope of the present application.

Claims

1. A display panel, characterized by, The display panel comprises: a driving circuit layer, a plurality of anode shielding structures are arranged in the driving circuit layer; a plurality of light emitting units are arranged on the driving circuit layer, the light emitting units comprise anodes; a plurality of leakage prevention structures are arranged in the same layer as the anodes, the leakage prevention structures are arranged in insulation with the anodes, and at least part of adjacent anodes are separated by the leakage prevention structures, and the leakage prevention structures are electrically connected to the anode shielding structures; wherein the leakage prevention structures are made of the same material as the anodes, and are made by the same patterning process as the anodes.

2. The display panel of claim 1, wherein, The leakage prevention structures are closed ring structures, and surround corresponding anodes.

3. The display panel of claim 1, wherein, Any two adjacent leakage prevention structures are arranged in insulation with each other.

4. The display panel of claim 1, wherein, The light emitting units comprise red light emitting units, green light emitting units and blue light emitting units, and the leakage prevention structures are arranged between the anodes of at least two adjacent types of light emitting units among the red light emitting units, the green light emitting units and the blue light emitting units.

5. The display panel of claim 4, wherein, The anodes of at least one type of light emitting units among the red light emitting units, the green light emitting units and the blue light emitting units are surrounded by the leakage prevention structures.

6. The display panel of claim 1, wherein, The display panel further comprises a pixel definition layer, the pixel definition layer has a plurality of leakage prevention openings, the leakage prevention openings penetrate the pixel definition layer in the thickness direction of the display panel, and expose the leakage prevention structures.

7. The display panel of claim 1, wherein, The driving circuit layer comprises a source electrode, a drain electrode and a bonding electrode, and the bonding electrode is arranged in the same layer as the source electrode and the drain electrode; wherein the bonding electrode is in contact with the leakage prevention structures and the anode shielding structures respectively.

8. The display panel of claim 1, wherein, In the same time sequence, the potential of the anode shielding structure is different from the potential of the adjacent anode.

9. The display panel of claim 8, wherein, The driving time sequence of the display panel comprises an initial stage, a compensation stage and a light emitting stage; wherein in the initial stage and the compensation stage, the potential of the anode shielding structure is kept at a high power supply potential; in the light emitting stage, the potential of the anode shielding structure is kept at any one of a reset potential, a ground potential or a low power supply potential.

10. The display panel of claim 9, wherein, The display panel further comprises a thin film transistor shielding structure, and the thin film transistor shielding structure is arranged in the same layer as the anode shielding structure; wherein in the initial stage and the compensation stage, the potential of the thin film transistor shielding structure is kept at the high power supply potential; in the light emitting stage, the potential of the thin film transistor shielding structure is kept at any one of the high power supply potential, the reset potential, the ground potential or the low power supply potential.

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