Display device

Abstract

The invention provides a display device. The display device comprises a substrate; a driving device layer disposed on the substrate; a flat layer disposed on the driving device layer, the flat layer including a plurality of trenches; each light-emitting device comprises an anode, a light-emitting layer and a cathode, a first part of the anode of the first light-emitting device is arranged on the flat part of the flat layer, a second part of the anode of the first light-emitting device is arranged on the first side wall and the bottom of the first groove, and a third part of the anode of the first light-emitting device is arranged on the side wall of the second groove; the third part of the anode of the second light emitting device is arranged on the second side wall of the first trench; and a plurality of first partition walls disposed in the trench and covering the second portion of the anode of the first light emitting device and the third portion of the anode of the second light emitting device. According to the technical scheme, the shear stress between the first partition wall and the surface of the anode is reduced, and the surface of the anode is prevented from being damaged.

Description

Technical Field

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

[0002] In the manufacturing technology of organic light-emitting diode (OLED) display panels, inkjet printing (IJP) technology is an important manufacturing process. Figure 1 , Figure 2 and Figure 3 As shown, in the existing IJP-OLED display panel, the printed substrate is usually composed of a flat layer PLN, an anode AND, a first partition wall BNK1 and a second partition wall BNK2. Among them, the first partition wall BNK1 is arranged between two adjacent anodes AND, and has two main functions: one is to cover the edges of the two adjacent anodes AND to prevent the light-emitting layer EL at the edges of the anode AND from becoming thinner and causing a short circuit between the anode AND and the cathode CTD; the other is to fill the through hole VH used for the electrical connection between the anode AND and the source-drain contact pad SD-PAD of the driving device layer, reduce the amount of light-emitting material used, and improve the flatness of the light-emitting layer EL around the through hole VH.

[0003] However, in the prior art, the thickness of the portion of the first partition wall BNK1 disposed in the through hole VH is much greater than the thickness of the portion of the first partition wall BNK1 disposed on the flat portion outside the through hole VH. During the sintering process of the first partition wall BNK1, the portion of the first partition wall BNK1 located in the through hole VH will shrink to a large extent, so that shear stress is generated between the portion of the first partition wall BNK1 located on the flat portion outside the through hole VH and the surface of the anode AND. This shear stress will form micro-damage on the surface of the anode AND, which includes a silver (Ag) electrode and an indium tin oxide (ITO) film covering the surface of the silver electrode. That is, at the edge of the first partition wall BNK1, the indium tin oxide film is micro-damaged due to stress, which in turn causes silver precipitation, such as Figure 4 and Figure 5 The precipitated silver will pierce the light-emitting layer EL, eventually causing a short circuit between the anode AND and the cathode CTD. Summary of the invention

[0004] An object of the embodiments of the present application is to provide a display device, which aims to prevent the surface of the anode from being damaged.

[0005] An embodiment of the present application provides a display device, comprising: a substrate; a driving device layer arranged on the substrate; a flat layer arranged on the driving device layer, the flat layer comprising a plurality of grooves, the plurality of grooves comprising adjacent first and second grooves; a plurality of light-emitting devices, the light-emitting devices comprising an anode, a light-emitting layer and a cathode, the anode comprising a first part, a second part and a third part, the plurality of light-emitting devices comprising adjacent first and second light-emitting devices, the first part of the anode of the first light-emitting device being arranged on the flat portion of the flat layer and between the first groove and the second groove, the second part of the anode of the first light-emitting device being arranged on the first side wall and the bottom of the first groove, the third part of the anode of the second light-emitting device being arranged on the second side wall of the first groove; and a plurality of first partition walls, the first partition walls being arranged in the grooves, the first partition walls covering the second part of the anode of the first light-emitting device, and covering the third part of the anode of the second light-emitting device.

[0006] In the above-mentioned display device, the driving device layer includes multiple thin film transistors and multiple contact pads, and the contact pads are electrically connected to the drains of the corresponding thin film transistors; the grooves expose the corresponding contact pads; the multiple contact pads include a first contact pad and a second contact pad; the second part of the first light-emitting device is electrically connected to the first contact pad located at the bottom of the first groove; and the third part of the anode of the second light-emitting device is not electrically connected to the first contact pad located at the bottom of the first groove.

[0007] In the above display device, the third portion of the anode of the first light emitting device is disposed on the sidewall of the second groove, and the third portion of the anode of the first light emitting device is not electrically connected to the second contact pad located at the bottom of the second groove.

[0008] In the above display device, the first partition wall is disposed in the groove, and the width of the top surface of the first partition wall is smaller than the width of the opening of the groove.

[0009] In the above-mentioned display device, there is a first predetermined distance between the edge of the second part of the anode of the first light-emitting device and the bottom edge of the second side wall of the first groove, and there is a second predetermined distance between the edge of the third part of the anode of the second light-emitting device and the bottom edge of the second side wall of the first groove, the first predetermined distance is greater than or equal to zero, and the second predetermined distance is greater than zero.

[0010] In the above display device, the first predetermined distance is less than or equal to 50% of the width of the first groove.

[0011] In the above display device, a contact area between the second portion of the anode of the first light emitting device and the first side wall is larger than a contact area between the third portion of the anode of the second light emitting device and the second side wall.

[0012] In the above display device, the height of the first partition wall is greater than or equal to 80% of the depth of the first groove and less than or equal to 120% of the depth of the first groove.

[0013] In the above display device, the plurality of grooves are arranged along a direction parallel to a second direction, and the second direction is perpendicular to the first direction.

[0014] In the above display device, a distance between an edge of the third portion of the anode of the second light emitting device and a top surface of the first partition wall is greater than or equal to 10% of a thickness of the first partition wall.

[0015] In the display device provided by the embodiment of the present application, the first part of the anode of the first light-emitting device is arranged on the flat part of the flat layer, the second part is arranged on the first side wall and the bottom of the first groove, the third part of the anode of the second light-emitting device is arranged on the second side wall of the first groove, and the first partition wall is arranged in the groove and covers these anode parts. This structural design enables the first partition wall to be arranged only in the groove without extending to the flat part of the flat layer, thereby significantly reducing the shear stress between the first partition wall and the anode surface, effectively preventing the indium tin oxide film on the anode surface from being micro-damaged, and thus avoiding the problem of silver precipitation and piercing the light-emitting layer to cause the anode and cathode short circuit. At the same time, since the second part of the anode of the first light-emitting device is arranged on the first side wall and the bottom of the first groove, the effective contact area between the anode and the source and drain contact pad is increased, the contact resistance is significantly reduced, and the conductive performance of the display device is improved. In addition, by respectively arranging the anodes of the first light-emitting device and the second light-emitting device on the two side walls of the first groove, and using the first partition wall to cover these parts respectively, it is ensured that the light-emitting layer will not be thinned at the edge of the anode, and reliable insulation between adjacent anodes is achieved, thereby improving the reliability of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a traditional IJP-OLED display panel.

[0017] Figure 2 yes Figure 1 A cross-sectional view of the display panel taken along line AA' is shown.

[0018] Figure 3 yes Figure 2 Magnified view of area Q in FIG.

[0019] Figure 4It is the traditional IJP-OLED display panel. Figure 2 Scanning electron microscope image of the portion corresponding to region Q in FIG. 1 when no silver precipitation occurs.

[0020] Figure 5 It is the traditional IJP-OLED display panel. Figure 2 Scanning electron microscope image of the portion corresponding to region Q in FIG. 1 when silver precipitation occurs.

[0021] Figure 6 is a block diagram of a display device provided in an embodiment of the present application.

[0022] Figure 7 is a schematic diagram of a display device provided in an embodiment of the present application.

[0023] Figure 8 yes Figure 7 A cross-sectional view taken along line BB' of the display device shown. DETAILED DESCRIPTION

[0024] The specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0025] The terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different technical features. The term "plurality" and similar words mean two or more, unless otherwise clearly defined.

[0026] The embodiments of the present application may be combined with each other.

[0027] like Figure 6 As shown, the display device provided in the embodiment of the present application may be, for example, an OLED display device.

[0028] The display device includes a display panel, a source driving circuit, a timing controller, a light emitting controller and a power management chip. The display panel includes a substrate S, a gate driving circuit, a data line DATA, a scan line SCAN, a power line (VDD, VSS), a light emitting control signal line EM, a pixel array, an encapsulation layer, a polarizer, a color filter, etc.

[0029] The substrate S may be, for example, a glass substrate, a flexible substrate (e.g., a polyimide substrate), etc. The pixel array is composed of a plurality of pixel units PX arranged in rows and columns, and each pixel unit PX includes a light-emitting device and a pixel driving circuit. The pixel driving circuit is electrically connected to the light-emitting device, and the pixel driving circuit is used to control the brightness of each light-emitting device. The light-emitting device includes a light-emitting layer EL, an electron transport layer, a hole transport layer, a cathode CTD, and an anode AND, etc. The encapsulation layer includes an organic / inorganic alternating multilayer structure. Each level of the gate driving unit in the gate driving circuit controls a row of pixel units PX. The source driving circuit is used to provide a data signal to the pixel unit PX. The timing controller is used to receive external image data and synchronization signals, and generate signals required by the gate driving circuit and the source driving circuit. The power management chip is used to provide the required operating voltage for each part of the display device.

[0030] In addition, the display device of the present application may also be integrated with an embedded touch circuit to realize a touch function.

[0031] An embodiment of the present application provides a display device, including a substrate S, a driving device layer ARRAY arranged on the substrate S, a planar layer PLN arranged on the driving device layer ARRAY, a plurality of light-emitting devices, a plurality of first partition walls BNK1, a plurality of second partition walls BNK2 and an encapsulation layer (not shown in the figure).

[0032] The flat layer PLN includes a plurality of grooves G, and the grooves D are not only used to electrically connect the anode AND to the source-drain contact pads SD-PAD of the driver layer, but also used to increase the contact area with the anode AND and optimize the stress distribution between the anode AND and the partition wall (the first partition wall BNK1, the second partition wall BNK2). The shape of the groove G can be a regular rectangle, an ellipse, etc., or an irregular quasi-rectangle, quasi-ellipse, etc., or other regular or irregular shapes (such as a wave shape, etc.). The length direction of the groove G is parallel to the first direction (such as the horizontal direction), and the length direction of the groove G is the maximum dimension direction of the groove G in the top view of the display device. The plurality of grooves G include adjacent first and second grooves. The distance between the first side wall and the second side wall of the first groove gradually decreases from the opening of the groove G to the bottom of the groove G, which is conducive to the reliable deposition (formation) of the anode material and prevents the local position of the anode from being too thin. The depth of the groove G is greater than 20% of the width W2 of the groove G at the opening and less than the width W2 of the groove G at the opening.

[0033] Since the length direction of the groove G is parallel to the first direction (e.g., the horizontal direction), the contact area between the anode AND and the side wall of the groove G changes from point contact in the traditional through hole VH to line contact. Specifically, in the traditional through hole VH, the coverage area of ​​the anode AND on the side wall of the through hole VH is only annular, and its contact length with the side wall is limited by the circumference of the through hole VH. In the embodiment of the present application, due to the use of the groove G extending along the first direction, the coverage area of ​​the anode AND on the side wall of the groove G is strip-shaped, and its contact length with the side wall can reach the length of the groove G, which significantly increases the contact length.

[0034] The length of the groove G can be set to 5 to 20 times its width. Such an elongated groove G provides a larger stress release space for the anode AND, is conducive to dispersing the stress of the anode AND, avoids the stress concentration at a certain point of the anode AND, and reduces the risk of micro-damage on the surface of the anode AND.

[0035] In addition, the elongated groove G also facilitates uniform filling of the first partition wall BNK1, avoids the stress concentration problem caused by local uneven filling in the traditional through hole VH, changes the distribution mode of stress, and improves the reliability of the display device.

[0036] The light-emitting device includes an anode AND, a light-emitting layer EL and a cathode CTD, the anode AND includes a first part AND1, a second part AND2 and a third part AND3, the multiple light-emitting devices include adjacent first light-emitting devices and second light-emitting devices, the first part AND1 of the anode AND of the first light-emitting device is arranged on the flat part of the flat layer PLN and is located between the first groove and the second groove, the second part AND2 of the anode AND of the first light-emitting device is arranged on the first side wall and the bottom of the first groove, the third part AND3 of the anode AND of the second light-emitting device is arranged on the second side wall of the first groove, the second side wall is opposite to (facing) the first side wall, the first side wall is the first slope portion of the flat layer PLN, and the second side wall is the second slope portion of the flat layer PLN.

[0037] The first partition wall BNK1 is disposed in the groove G, and the first partition wall BNK1 covers the second portion AND2 of the anode AND of the first light emitting device, and covers the third portion AND3 of the anode AND of the second light emitting device. The first partition wall BNK1 is in the shape of a long strip, and the length direction of the first partition wall BNK1 is parallel to the first direction. The width of the bottom of the first partition wall BNK1 is smaller than the width W1 of the top of the first partition wall BNK1. The ratio of the width W1 of the top of the first partition wall BNK1 to the width of the bottom of the first partition wall BNK1 is 1.2 to 2. The thickness H2 of the first partition wall BNK1 has a variation rate of less than 30% in its height direction. The height difference between the top surface of the first partition wall BNK1 and the surface of the flat portion of the flat layer PLN is less than 2 microns, and the height difference cannot be too large to avoid faults or uneven thickness in the subsequent deposition process of the light emitting layer EL.

[0038] The second partition wall BNK2 is disposed on the planar layer PLN and covers a portion of the anode AND. The length direction of the second partition wall BNK2 is parallel to the second direction, and the second direction is perpendicular to the first direction.

[0039] The anode AND includes a silver electrode and an indium tin oxide thin film disposed on the surface of the silver electrode.

[0040] The contact area between the second part AND2 of the anode AND of the first light emitting device and the bottom of the first groove is less than 30% of the area of ​​the first part AND1 of the anode AND of the first light emitting device. The light emitting layer EL is disposed on the first part AND1 of the anode AND and on the first partition wall BNK1, and a part of the light emitting layer EL is disposed between two adjacent second partition walls BNK2. The ratio of the thickness of the second part AND2 of the anode AND of the first light emitting device to the thickness of the first part AND1 is in the range of 0.8 to 1.2, so as to ensure that the anode AND has a similar thickness in the flat portion and the groove G portion, thereby reducing stress concentration.

[0041] The cathode CTD is disposed on the light emitting layer EL, and the cathode CTD is also disposed on at least a portion of the first partition wall BNK1 and the second partition wall BNK2.

[0042] The encapsulation layer is disposed on the cathode CTD.

[0043] In this embodiment, the substrate S of the display device can be a glass substrate, a quartz substrate, a flexible substrate, etc. The driving device layer ARRAY is arranged on the substrate S to control the light emission of the light-emitting device. The flat layer PLN is arranged on the driving device layer ARRAY to flatten the surface of the driving device layer ARRAY. The flat layer PLN can be made of organic materials, such as polyimide, acrylic resin, etc., or inorganic materials, such as silicon oxide, silicon nitride, etc. The flat layer PLN includes a plurality of grooves G, the length direction of which is parallel to the first direction (for example, the pixel row direction). The angle between the side wall and the bottom of the groove G can be in the range of 30 degrees to 60 degrees, that is, the inclination angle range of the first side wall and the second side wall is 30 degrees to 60 degrees. The angle between the side wall and the bottom of the groove G refers to the angle between the tangent of the midpoint of the side wall of the groove G and the surface of the bottom, which is conducive to the reliable deposition of the anode AND in the groove G and prevents the anode AND from breaking in the groove G. The anode AND of the light-emitting device includes a first part AND1, a second part AND2 and a third part AND3, so that the anode AND can be electrically connected to the contact pad SD-PAD and covered by the first partition wall BNK1 in another adjacent groove G. The first part AND1 is arranged on the flat part of the flat layer PLN, and constitutes the light-emitting part of the light-emitting device with the light-emitting layer EL and the cathode CTD. The second part AND2 extends to the first side wall and the bottom of the first groove, and is used to be electrically connected to the contact pad SD-PAD. The third part AND3 extends to the side wall of the second groove, but does not contact the contact pad SD-PAD at the bottom of the groove G. The first partition wall BNK1 is arranged in the groove G, and its material can be an organic material such as polyimide and acrylic resin.

[0044] The driving device layer ARRAY includes a plurality of thin film transistors and a plurality of contact pads SD-PAD, and the contact pads SD-PAD are electrically connected to the drain of the corresponding thin film transistor. The groove G exposes the corresponding contact pad SD-PAD. The plurality of contact pads SD-PAD include a first contact pad and a second contact pad. The second portion AND2 of the first light-emitting device is electrically connected to the first contact pad at the bottom of the first groove. The third portion AND3 of the anode AND of the second light-emitting device is not electrically connected to the first contact pad at the bottom of the first groove.

[0045] In this embodiment, the driving device layer ARRAY includes a plurality of thin film transistors arranged in an array and a plurality of contact pads SD-PAD corresponding thereto. Each thin film transistor includes a gate, a source and a drain, wherein the gate is connected to the gate driving circuit through a gate line, the source is connected to the data driving circuit through a data line, and the drain is electrically connected to the corresponding contact pad SD-PAD through a metal wiring. The contact pad SD-PAD can be made of a material with good conductive properties such as molybdenum, tungsten, aluminum, copper or their alloys. The groove G exposes the upper surface of the contact pad SD-PAD. The second part AND2 of the anode AND of the first light-emitting device is electrically connected to the first contact pad at the bottom of the groove G, which can effectively reduce the contact resistance. Although the third part AND3 of the anode AND of the second light-emitting device also extends to the second side wall of the first groove, its edge is kept at a certain distance from the bottom of the groove G and will not be electrically connected to the first contact pad, thereby ensuring electrical isolation between adjacent light-emitting devices.

[0046] The third portion AND3 of the anode AND of the first light emitting device is disposed on the sidewall (second sidewall) of the second trench, and the third portion AND3 of the anode AND of the first light emitting device is not electrically connected to the second contact pad at the bottom of the second trench.

[0047] Similarly, the third portion AND3 of the anode AND of the first light emitting device extends onto the sidewall of the second trench but is not electrically connected to the second contact pad at the bottom of the second trench. The first partition wall BNK1 covers the edge of the third portion AND3 of the anode AND of the second light emitting device. The thickness of the third portion AND3 may be the same as that of the first portion AND1 and the second portion AND2.

[0048] In this embodiment, the covering shape of the third part AND3 of the anode AND of the first light-emitting device on the side wall of the second groove can be rectangular, trapezoidal or arc-shaped. The covering size of the third part AND3 on the side wall of the second groove gradually increases from the top edge of the second side wall to the bottom edge of the second side wall. This gradual covering size is conducive to reducing stress concentration. The contact interface between the third part AND3 and the side wall is set to be chamfered, which can avoid excessive stress on the edge of the third part AND3, which is conducive to improving structural stability.

[0049] The first partition wall BNK1 is disposed in the trench G, and a width W1 of a top surface of the first partition wall BNK1 is smaller than a width W2 of an opening of the trench G.

[0050] The cross-section of the first partition wall BNK1 is similar to or close to an inverted trapezoid, and the width W1 of the top surface thereof is smaller than the width W2 of the opening of the groove G. Specifically, the ratio of the top surface width of the first partition wall BNK1 to the width of the opening of the groove G is in the range of 0.4 to 0.9. The material of the first partition wall BNK1 is a material with a thermal expansion coefficient in the range of 20ppm / °C to 40ppm / °C, so that the thermal expansion characteristics of the first partition wall BNK1 can be similar to those of the anode AND material, thereby effectively reducing thermal stress.

[0051] In this embodiment, a step is provided on the sidewall of the first trench, and correspondingly, the sidewall of the first partition wall BNK1 is stepped, and the number of the steps may be 2 to 4. Such a step can provide better support for the second portion AND2 and the third portion AND3 of the anode AND, and in addition, the step can also serve as a blocking portion for the third portion AND3 of the anode AND, preventing the third portion AND3 of the anode AND from contacting the contact pad SD-PAD.

[0052] A first predetermined distance D1 is provided between an edge of the second portion AND2 of the anode AND of the first light-emitting device and a bottom edge of the second side wall of the first groove, a second predetermined distance D2 is provided between an edge of the third portion AND3 of the anode AND of the second light-emitting device and a bottom edge of the second side wall of the first groove, the first predetermined distance D1 is greater than or equal to zero, and the second predetermined distance D2 is greater than zero.

[0053] In this embodiment, when the first predetermined distance D1 is 0, the edge of the second portion AND2 of the anode AND of the first light-emitting device just reaches the bottom edge of the second sidewall of the first groove, so that the contact resistance can be reduced by maximizing the use of the area at the bottom of the groove G. The second predetermined distance D2 is greater than zero, which can ensure reliable insulation between the third portion AND3 of the anode AND of the second light-emitting device and the first contact pad.

[0054] In this embodiment, a mesh portion is disposed at the bottom of the first trench, and the mesh portion can increase the contact area between the second portion AND2 of the anode AND and the contact pad SD-PAD.

[0055] The first predetermined distance D1 is less than or equal to 50% of the width of the first groove. This ensures that the second portion AND2 of the anode AND of the first light-emitting device can fully utilize the area at the bottom of the groove G to form a good electrical contact with the first contact pad. The first predetermined distance D1 can also be further optimized to be within a range of 20% to 40% of the width of the groove G, which can ensure sufficient contact area and prevent the second portion AND2 of the anode AND of the first light-emitting device from contacting the third portion AND3 of the anode AND of the second light-emitting device.

[0056] A contact area between the second portion AND2 of the anode AND of the first light emitting device and the first side wall is greater than a contact area between the third portion AND3 of the anode AND of the second light emitting device and the second side wall.

[0057] In this embodiment, the contact area between the second portion AND2 of the anode AND of the first light-emitting device and the first side wall is greater than the contact area between the third portion AND3 of the anode AND of the second light-emitting device and the second side wall. This is to ensure that the third portion AND3 is reliably covered by the first partition wall BNK1 and avoids contact with the first contact pad. The ratio of the contact areas is preferably set in the range of 1.5 to 3.

[0058] The height of the first partition wall BNK1 is greater than or equal to 80% and less than or equal to 120% of the depth of the first trench.

[0059] The setting of such a height range is mainly based on the following considerations: the height of the first partition wall BNK1 is not less than 80% of the depth of the groove G and not more than 120% of the depth of the groove G, so as to ensure that the first partition wall BNK1 can completely cover the edge of the anode AND, avoid too large a height difference between the flat portion of the flat layer PLN and the first partition wall BNK1, and thus avoid the light-emitting layer EL from becoming thinner at the edge of the groove G. The height of the first partition wall BNK1 can also be adjusted according to its material properties. For example, when the material of the first partition wall BNK1 is a material with a relatively small thermal expansion coefficient, the height of the first partition wall BNK1 is less than the depth of the groove G and the difference between the height of the first partition wall BNK1 and the depth of the groove G is relatively small; when the material of the first partition wall BNK1 is a material with a relatively large thermal expansion coefficient, the height of the first partition wall BNK1 is less than the depth of the groove G and the difference between the height of the first partition wall BNK1 and the depth of the groove G is relatively large.

[0060] The plurality of grooves G are arranged along a direction parallel to a second direction, and the second direction is perpendicular to the first direction.

[0061] In this embodiment, a plurality of grooves G are arranged in a direction parallel to a second direction (e.g., a pixel column direction), and the second direction is perpendicular to the first direction. The spacing between any two grooves G is equal (the distance between the center lines of adjacent grooves G remains constant), or the spacing between the grooves G is unequal according to the layout of the pixels (the distance between the center lines of adjacent grooves G is unequal according to the area requirements of sub-pixels of different colors). In the length direction of the grooves G, the grooves G cover a portion of the anode AND of each pixel unit of the entire pixel row.

[0062] The distance H1 between the edge of the third portion AND3 of the anode AND of the second light emitting device and the top surface of the first partition wall BNK1 is greater than or equal to 10% of the thickness H2 of the first partition wall BNK1, so as to prevent the first partition wall BNK1 from generating excessive stress on the edge of the anode AND during the sintering process.

[0063] The Young's modulus of the material of the first partition wall BNK1 is smaller than the Young's modulus of the material of the anode AND.

[0064] The surface roughness of the first sidewall and the second sidewall of the first trench is smaller than the surface roughness of the bottom.

[0065] In the display device provided by the embodiment of the present application, the first part AND1 of the anode AND of the first light-emitting device is arranged on the flat part of the flat layer PLN, the second part AND2 is arranged on the first side wall and the bottom of the first groove, the third part AND3 of the anode AND of the second light-emitting device is arranged on the second side wall of the first groove, and the first partition wall BNK1 is arranged in the groove G and covers these anode AND parts. This structural design enables the first partition wall BNK1 to be arranged only in the groove G without extending to the flat part of the flat layer PLN, thereby significantly reducing the shear stress between the first partition wall BNK1 and the surface of the anode AND, effectively preventing the indium tin oxide film on the surface of the anode AND from being micro-damaged, thereby avoiding the problem of silver precipitation and piercing the light-emitting layer EL to cause the anode AND and the cathode CTD to short-circuit. At the same time, since the second part AND2 of the anode AND of the first light-emitting device is arranged on the first side wall and the bottom of the first groove, the effective contact area between the anode AND and the contact pad SD-PAD is increased, the contact resistance is significantly reduced, and the conductive performance of the display device is improved. In addition, by respectively arranging the anodes AND of the first light-emitting device and the second light-emitting device on the two side walls of the first groove and using the first partition wall BNK1 to cover these parts respectively, it is ensured that the light-emitting layer EL will not become thinner at the edge of the anode AND, and reliable insulation between adjacent anodes AND is achieved, thereby improving the reliability of the display device.

[0066] In the prior art, the surface of the anode AND is easily damaged. In particular, when the anode AND includes a silver electrode and an indium tin oxide film covering the surface of the silver electrode, the indium tin oxide film is easily micro-damaged due to thermal stress in the manufacturing process. Such micro-damage can cause silver precipitation, which can pierce the light-emitting layer EL, and eventually cause a short circuit between the anode AND and the cathode CTD, affecting the display quality and service life of the display panel.

[0067] To solve the above technical problems, the present application provides a display device, which includes a display panel, which includes a substrate S, a driving device layer ARRAY arranged on the substrate S, a flat layer PLN arranged on the driving device layer ARRAY, a light-emitting device layer arranged on the flat layer PLN, and an encapsulation layer arranged on the light-emitting device layer.

[0068] The driving device layer ARRAY includes a plurality of thin film transistors and a plurality of contact pads SD-PAD, and the contact pads SD-PAD are electrically connected to the drains of the corresponding thin film transistors. A plurality of grooves G are provided on the planar layer PLN, and the length direction of the grooves G is parallel to the first direction, and the grooves G expose the contact pads SD-PAD of the driving device layer ARRAY. The light emitting device includes an anode AND, a light emitting layer EL, and a cathode CTD, wherein the anode AND of the first light emitting device includes: a first part AND1, a second part AND2, and a third part AND3, the first part AND1 is provided on the surface of the planar portion of the planar layer PLN, the second part AND2 is provided on the first sidewall and the bottom of the first groove and is electrically connected to the first contact pad, and the third part AND3 is provided on the sidewall of the second groove and is not electrically connected to the second contact pad; the third part AND3 of the anode AND of the second light emitting device is provided on the second sidewall of the first groove and is not electrically connected to the first contact pad.

[0069] The display panel further includes a plurality of first partition walls BNK1 and a plurality of second partition walls BNK2. The first partition walls BNK1 are in the shape of long strips, the length direction of the first partition walls BNK1 is parallel to the first direction, the first partition walls BNK1 are arranged in the groove G, and the width of the first partition walls BNK1 is smaller than the width of the opening of the groove G. The first partition walls BNK1 cover the second portion AND2 of the anode AND of the first light-emitting device, and cover the third portion AND3 of the anode AND of the second light-emitting device. The second portion AND2 of the anode AND of the first light-emitting device is insulated from the third portion AND3 of the anode AND of the second light-emitting device.

[0070] Preferably, there is a first predetermined distance D1 between the edge of the second part AND2 of the anode AND of the first light emitting device and the bottom edge of the second side wall of the first groove, and there is a second predetermined distance D2 between the edge of the third part AND3 of the anode AND of the second light emitting device and the bottom edge of the second side wall of the first groove, the first predetermined distance D1 is greater than or equal to zero, and the second predetermined distance D2 is greater than zero. The second partition wall BNK2 is arranged on the flat layer PLN and covers a part of the anode AND. The second partition wall BNK2 is in a strip shape, and the length direction of the second partition wall BNK2 is parallel to the second direction, and the second direction is perpendicular to the first direction. The light emitting layer EL is formed by inkjet printing, and the light emitting layer EL is arranged on the first part AND1 of the anode AND and on the first partition wall BNK1, and a part of the light emitting layer EL is arranged in the space between two adjacent second partition walls BNK2. The cathode CTD is arranged on the light emitting layer EL, and the encapsulation layer is arranged on the cathode CTD.

[0071] In the present application, the edges of two adjacent anodes AND are arranged in the groove G, wherein the second part AND2 of the anode AND of the first light-emitting device is electrically connected to the first contact pad, and the third part AND3 of the anode AND of the second light-emitting device is arranged on the second sidewall of the first groove and is not electrically connected to the first contact pad, thereby avoiding the stress unevenness caused by the difference in thermal expansion coefficient between the first partition wall BNK1 and the surrounding structure; the width of the first partition wall BNK1 is smaller than the width at the opening of the groove G, thereby avoiding the first partition wall BNK1 from extending to the surface of the flat part of the flat layer PLN, thereby reducing the stress between the first partition wall BNK1 and the surface of the anode AND, and preventing the damage of the surface film layer of the anode AND. At the same time, the first partition wall BNK1 covers the edge of the adjacent anode AND, preventing the light-emitting layer EL from becoming thinner and causing a short circuit. The second part AND2 of the anode AND of the first light-emitting device is arranged on the first sidewall and bottom of the first groove and is electrically connected to the first contact pad, thereby increasing the contact area between the anode AND and the contact pad SD-PAD, and reducing the contact resistance.

[0072] In the display panel provided by the present invention, the first part AND1 of the anode AND of the first light-emitting device is arranged on the surface of the flat part of the flat layer PLN, the second part AND2 is arranged on the first side wall and the bottom of the first groove, the third part AND3 of the anode AND of the second light-emitting device is arranged on the second side wall of the first groove, and the first partition wall BNK1 is arranged in the groove G and covers these anode AND parts. This structural design enables the first partition wall BNK1 to be arranged only in the groove G without extending to the flat part of the flat layer PLN, thereby significantly reducing the shear stress between the first partition wall BNK1 and the surface of the anode AND, effectively preventing the indium tin oxide film on the surface of the anode AND from being micro-damaged, thereby avoiding the problem of silver precipitation and piercing the light-emitting layer EL to cause the anode AND and the cathode CTD to short-circuit. At the same time, since the second part AND2 of the anode AND of the first light-emitting device is arranged on the first side wall and the bottom of the first groove, the effective contact area between the anode AND and the contact pad SD-PAD is increased, the contact resistance is significantly reduced, and the conductive performance of the display panel is improved.

[0073] The embodiments of the present application are described in detail above, and the contents of this specification should not be construed as limiting the scope of protection of the present application.

Claims

1. A display device, characterized in that: include: substrate; A driving device layer disposed on the substrate; A planar layer disposed on the driving device layer, the planar layer comprising a plurality of grooves, wherein the plurality of grooves comprises adjacent first grooves and second grooves; A plurality of light-emitting devices, the light-emitting devices comprising an anode, a light-emitting layer and a cathode, the anode comprising a first portion, a second portion and a third portion, the plurality of light-emitting devices comprising adjacent first and second light-emitting devices, the first portion of the anode of the first light-emitting device being disposed on a flat portion of the flat layer and between the first trench and the second trench, the second portion of the anode of the first light-emitting device being disposed on a first sidewall and a bottom of the first trench, and the third portion of the anode of the second light-emitting device being disposed on a second sidewall of the first trench; as well as A plurality of first partition walls are provided in the groove, and the first partition walls cover the second portion of the anode of the first light emitting device and the third portion of the anode of the second light emitting device.

2. The display device according to claim 1, wherein: The driving device layer includes a plurality of thin film transistors and a plurality of contact pads, wherein the contact pads are electrically connected to drain electrodes of corresponding thin film transistors; The groove exposes the corresponding contact pad; The plurality of contact pads include a first contact pad and a second contact pad; The second portion of the first light emitting device is electrically connected to a first contact pad located at a bottom of the first trench; The third portion of the anode of the second light emitting device is not electrically connected to the first contact pad located at the bottom of the first trench.

3. The display device according to claim 1, wherein: The third portion of the anode of the first light emitting device is disposed on a sidewall of the second trench, and the third portion of the anode of the first light emitting device is not electrically connected to a second contact pad located at a bottom of the second trench.

4. The display device according to claim 1, wherein: The first partition wall is disposed in the groove, and a width of a top surface of the first partition wall is smaller than a width of an opening of the groove.

5. The display device according to claim 1, wherein: There is a first predetermined distance between the edge of the second portion of the anode of the first light-emitting device and the bottom edge of the second side wall of the first groove, and there is a second predetermined distance between the edge of the third portion of the anode of the second light-emitting device and the bottom edge of the second side wall of the first groove, the first predetermined distance is greater than or equal to zero, and the second predetermined distance is greater than zero.

6. The display device according to claim 5, characterized in that The first predetermined distance is less than or equal to 50% of the width of the first groove.

7. The display device according to claim 1, wherein: A contact area between the second portion of the anode of the first light emitting device and the first side wall is greater than a contact area between the third portion of the anode of the second light emitting device and the second side wall.

8. The display device according to claim 1, wherein: The height of the first partition wall is greater than or equal to 80% of the depth of the first groove and less than or equal to 120% of the depth of the first groove.

9. The display device according to claim 1, wherein: The length direction of the groove is parallel to the first direction, and the plurality of grooves are arranged along a direction parallel to a second direction, and the second direction is perpendicular to the first direction.

10. The display device according to claim 1, wherein: A distance between an edge of the third portion of the anode of the second light emitting device and a top surface of the first partition wall is greater than or equal to 10% of a thickness of the first partition wall.

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