Display panel, manufacturing method and display device

Abstract

The application discloses a display panel, a manufacturing method and a display device. The display panel of one embodiment comprises a display area and a non-display area surrounding the display area. The display area comprises a power signal line, the power signal line comprises a first end close to a display driving chip and a second end away from the display driving chip. The non-display area comprises a metal trace surrounding the power signal line, the metal trace is electrically connected with the second end. When the power signal line receives a power signal from the display driving chip, the metal trace sends a compensation signal to the second end to compensate the voltage drop of the power signal from the first end to the second end. The display panel of the embodiment can realize two-end driving of the first end and the second end of the power signal line and compensation of the second end, effectively improves the display uniformity of the display device, and has a wide application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display. More particularly, it relates to a display panel, a manufacturing method and a display device. BACKGROUND

[0002] In the prior art, OLED (organic light emitting diode) is the next generation display technology of LCD display, which has excellent performance such as lightness, high color gamut, high contrast, low power consumption, flexibility, etc., and is increasingly valued by major companies. However, in the process of displaying the OLED display device according to the power signal, due to the resistance of the wire itself, the IR drop phenomenon is easily caused, which makes the overall display uniformity of the OLED display device poor. SUMMARY

[0003] The present application aims to provide a display panel, a manufacturing method thereof and a display device to solve at least one of the problems in the prior art.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] The first aspect of the present application provides a display panel, comprising a display area and a non-display area surrounding the display area, wherein,

[0006] The display area comprises a power signal line, the power signal line comprises a first end close to a display driving chip and a second end away from the display driving chip;

[0007] The non-display area comprises:

[0008] a metal trace surrounding the power signal line, the metal trace being electrically connected to the second end, wherein when the power signal line receives a power signal from the display driving chip, the metal trace sends a compensation signal to the second end to compensate for the voltage drop of the power signal from the first end to the second end.

[0009] Further, the metal trace is a crack detection line;

[0010] The display panel further comprises a switching element, a first compensation signal line and a second compensation signal line,

[0011] wherein,

[0012] The control end of the switching element receives a gate driving signal of the display driving chip;

[0013] The input end of the switching element receives the compensation signal through the first compensation signal line;

[0014] an output terminal of the switch element is connected to the crack detection line;

[0015] when the gate drive signal is a conduction signal, the compensation signal is transmitted to the second terminal via the crack detection line.

[0016] Further, in the compensation phase, the gate drive signal is a conduction signal, and the switch element is turned on.

[0017] In the crack detection phase, the gate drive signal is a cutoff signal, and the switch element is turned off.

[0018] Further, the level of the compensation signal is set to make the level of the second terminal equal to the level of the first terminal.

[0019] Further, the display panel further comprises a touch layer;

[0020] The metal track is a protection line formed in the touch layer, wherein when the power signal line receives the power signal from the display drive chip, the protection line transmits the compensation signal received from the touch drive chip to the second terminal.

[0021] Further, the level of the compensation signal is set to make the level of the second terminal equal to the level of the first terminal.

[0022] Further, the display panel further comprises a touch layer, a switch element, a first compensation signal line, and a second compensation signal line;

[0023] The metal track comprises a crack detection line surrounding the power signal line and a protection line formed in the touch layer surrounding the power signal line, and the crack detection line and the protection line are connected to the second terminal in parallel;

[0024] wherein,

[0025] The control terminal of the switch element receives the gate drive signal of the display drive chip;

[0026] The input terminal of the switch element receives the first compensation signal through the first compensation signal line;

[0027] The output terminal of the switch element is connected to the crack detection line, and when the gate drive signal is a conduction signal, the compensation signal is transmitted to the second terminal via the crack detection line.

[0028] The protection line transmits the second compensation signal received from the touch drive chip to the second terminal when the power signal line receives the power signal from the display drive chip.

[0029] Further, the level of the first compensation signal is set such that the level of the second end is equal to the level of the first end.

[0030] The level of the second compensation signal is set such that the level of the second end is equal to the level of the first end.

[0031] The second aspect of the present application provides a display device comprising the display panel provided by the first aspect of the present application.

[0032] The third aspect of the present application provides a manufacturing method of a display panel, the method comprising:

[0033] forming a display area, the display area comprising a power signal line, the power signal line comprising a first end close to a display driving chip and a second end away from the display driving chip;

[0034] forming a non-display area, the non-display area comprising: a metal trace surrounding the power signal line, the metal trace being electrically connected to the second end, wherein when the power signal line receives a power signal from the display driving chip, the metal trace sends a compensation signal to the second end to compensate for voltage drop of the power signal from the first end to the second end.

[0035] Further, the method comprises:

[0036] forming a driving TFT transistor in the display area and a light emitting element driven by the driving TFT transistor to emit light, wherein the power signal line is arranged in the same layer as source-drain electrodes of the driving TFT transistor;

[0037] forming a switching element, a crack detection line, a first compensation signal line and a second compensation signal line in the non-display area, wherein a gate of the switching element, the crack detection line and a gate of the driving TFT transistor are arranged in the same layer, source and drain electrodes, the first compensation signal line and the second compensation signal line are arranged in the same layer as source-drain electrodes of the driving TFT transistor; the source of the switching element is connected to the display driving chip through the first compensation signal line, the drain is connected to the crack detection line through a first via in a dielectric layer between the source-drain layer and the gate layer, and the crack detection line is connected to the second end through a second via in the dielectric layer.

[0038] Further, the method comprises:

[0039] Forming a driving TFT transistor, a light emitting element driven by the driving TFT transistor, an encapsulation layer, and a touch layer in the display area, wherein the power signal line is arranged in the same layer as the source-drain electrode of the driving TFT transistor, and the touch layer comprises a first touch metal extending in a first direction, a second touch metal extending in a second direction intersecting the first direction, and an insulating layer between the first touch metal and the second touch metal.

[0040] Forming a protection line in the touch layer in the non-display area, wherein the protection line is arranged in the same layer as the first touch metal, and the protection line is connected to the second end through a third via hole in the planarization layer between the touch layer and the driving TFT transistor.

[0041] Further, the method comprises:

[0042] Forming a driving TFT transistor, a light emitting element driven by the driving TFT transistor, an encapsulation layer, and a touch layer in the display area, wherein the power signal line is arranged in the same layer as the source-drain electrode of the driving TFT transistor, and the touch layer comprises a first touch metal extending in a first direction, a second touch metal extending in a second direction intersecting the first direction, and an insulating layer between the first touch metal and the second touch metal.

[0043] Forming a switching element, a crack detection line, a first compensation signal line, a second compensation signal line, and a protection line in the touch layer in the non-display area, wherein

[0044] The gate of the switching element, the crack detection line, and the gate of the driving TFT transistor are arranged in the same layer, and the source and the drain, the first compensation signal line, and the second compensation signal line are arranged in the same layer as the source-drain electrode of the driving TFT transistor; the source of the switching element is connected to the display driving chip through the first compensation signal line, the drain is connected to the crack detection line through a first via hole in the dielectric layer between the source-drain layer and the gate layer, and the crack detection line is connected to the second end through a second via hole in the dielectric layer.

[0045] The protection line is arranged in the same layer as the first touch metal, and the protection line is connected to the second end through a third via hole in the planarization layer between the touch layer and the driving TFT transistor.

[0046] The present application has the following beneficial effects:

[0047] The technical solution described in this invention electrically connects the metal traces in the non-display area to the second end of the power signal line away from the driver chip via metal traces. When the display panel is in display mode, the power signal line receives power signals from the display driver chip, and the metal traces can transmit the received compensation signals to the second end, thereby realizing the driving of both ends of the power signal line and the compensation of the remote power signal line, effectively improving the display uniformity of the display device, and has broad application prospects. Attached Figure Description

[0048] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0049] Figure 1 This diagram shows a top view of the display panel according to an optional embodiment of the present invention.

[0050] Figure 2 This invention illustrates the fabrication of an optional embodiment. Figure 1 The flowchart shown is a schematic diagram of the display panel.

[0051] Figure 3 This invention illustrates an embodiment. Figure 1 A schematic diagram of the layer structure in dashed box B shown;

[0052] Figure 4 This diagram illustrates the structure of the display panel in a top view, according to another optional embodiment of the present invention.

[0053] Figure 5 This invention illustrates an embodiment. Figure 4 A schematic diagram of the layer structure at section C shown in the figure;

[0054] Figure 6 This invention illustrates the fabrication of an optional embodiment. Figure 1 The flowchart shown is a schematic diagram of the display panel.

[0055] Figure 7 This diagram illustrates the structure of the display panel in a top view, according to another optional embodiment of the present invention.

[0056] Figure 8 This invention illustrates the fabrication of an optional embodiment. Figure 7 The flowchart shown is a schematic diagram of the display panel. Detailed Implementation

[0057] In the prior art, for the display uneven phenomenon of the display device, the inventors further propose that, in the prior art, the power signal line (ELVDD) of the display panel is generally extended from the first end close to the display driving chip to the second end away from the driving chip (IC), and when the power signal line (ELVDD) is used to output the power signal, the impedance in the power signal line causes IR Drop, so that the voltage of the power signal input by the display device at the IC close end is higher than that at the IC far end, thereby causing the luminous brightness at the IC close end to be higher than that at the IC far end, and the screen luminous uniformity is poor, and especially for the medium and large size display device, the IR Drop is more serious, and the luminous uniformity of the display device is poorer.

[0058] Therefore, the embodiments of the present application propose a display panel, a manufacturing method and a display device to solve the above problems.

[0059] The first embodiment of the present application proposes a display panel, which comprises:

[0060] The display panel 1 comprises a display area AA and a non-display area BB surrounding the display area, wherein,

[0061] The display area AA comprises a power signal line 11 and a display driving chip 12, the power signal line 11 comprises a first end 111 close to the display driving chip 12 and a second end 112 away from the display driving chip 12;

[0062] The non-display area BB comprises:

[0063] A metal trace 13 surrounding the power signal line 11, the metal trace 13 is electrically connected with the second end 112, wherein, when the power signal line receives the power signal from the display driving chip (the connection relationship between the two is not shown in the figure), the metal trace sends a compensation signal to the second end to compensate the voltage drop of the power signal from the first end to the second end.

[0064] The embodiments of the present application electrically connect the metal trace of the non-display area with the second end of the power signal line away from the driving chip through the metal trace, when the display panel is in the display state, the power signal line receives the power signal from the display driving chip, the metal trace can transmit the received compensation signal to the second end, so that the power signal input by the first end and the power signal input by the second end are equal, thereby realizing the two-end driving of the power signal line and the compensation of the far-end power signal line, effectively improving the display uniformity of the display device, and having a wide application prospect.

[0065] It is worth noting that the power signal line is not only arranged in the display area, but also arranged in the non-display area. Figure 1As shown, the power signal line is also arranged in the non-display area, and the embodiment compensates the power signal line in the display area to improve display uniformity. The arrangement of the power signal line is not described herein.

[0066] In the embodiment of the present application, the compensation module can implement the above compensation modes in different ways.

[0067] In an optional embodiment, as shown in Figure 1 The metal trace 13 is a crack detection line.

[0068] In the prior art, a metal line is usually formed at the edge of the display panel as a panel crack detect (PCD) line. In detection, the PCD line forms a wire loop at the edge of the display screen, and the resistance and voltage of the PCD line are tested to monitor whether the PCD line has a crack, so as to determine whether the edge of the OLED display panel is damaged.

[0069] The embodiment multiplexes the crack detection line, that is, the crack detection line can be used for crack detection in the detection stage and also as a metal trace to realize that the second end of the power signal line is connected to the compensation signal. This setting does not increase other traces and simplifies the circuit design.

[0070] As shown in Figure 1 In an optional embodiment, the display panel 1 further includes a switch element 14, a first compensation signal line 15, and a second compensation signal line 16, wherein

[0071] The control end 141 of the switch element receives the gate drive signal of the display driving chip 12.

[0072] The input end 142 of the switch element receives the compensation signal through the first compensation signal line 15.

[0073] The output end 143 of the switch element is connected to the crack detection line.

[0074] When the gate drive signal is a conductive signal, the compensation signal is transmitted to the second end 112 via the crack detection line 13.

[0075] The embodiment sets the switch element 14 between the PCD line 13 and the display driving chip 12, and controls the PCD line by using the switch element to form a control circuit. In the embodiment, the compensation signal is sent by the display driving chip.

[0076] As shown in Figure 1As shown, the switch element 14 includes an input end 142, an output end 143, and a control end 141 connected with the display driving chip 12 to receive the gate driving signal; the input end 142 is connected with the first compensation signal line 15 to receive the compensation signal output from the display driving chip 12; and the output end 143 is connected with the crack detection line 13 to transmit the compensation signal to the crack detection line.

[0077] In one specific example, two switch elements are provided in the embodiment to transmit the compensation signal from both sides, which can further improve the transmission stability of the compensation signal.

[0078] In one optional embodiment, in the compensation stage, the gate driving signal is a conduction signal, the switch element is turned on, and the compensation signal is transmitted to the second end via the crack detection line;

[0079] In the crack detection stage, the gate driving signal is a cut-off signal, and the switch element is cut off.

[0080] In the crack detection stage, the switch element is cut off, the crack detection line is used for crack detection, and the original crack detection function is realized. In the compensation stage, the switch element is turned on, the crack detection line is used as the metal trace 13, the first compensation signal line 15 is electrically connected with the display driving chip 12 to receive the compensation signal of the display driving chip 12, and the second compensation signal line 16 is connected with the crack detection line 13 to transmit the compensation signal to the second end 112 of the power signal line 11 via the crack detection line. Since the crack detection line 13 is electrically connected with the second end 112 of the power signal line 11, the compensation signal can be transmitted from the display driving chip 12 to the second end 112 of the power signal line, and the compensation signal can compensate for the voltage drop of the power signal line, thereby improving the display uniformity.

[0081] In order to achieve the optimal compensation effect, that is, the closer the power signal received by the first end and the compensation signal received by the second end, the better the compensation effect, and the uniformity during display can be improved, therefore, in one optional embodiment, the level of the compensation signal is set to be equal to the level of the second end 112 and the level of the first end 111 to achieve the best compensation effect. That is, the power signal line simultaneously drives the first end 111 and the second end 112 according to the power signal and the compensation signal respectively, compensates for the level difference between the first end and the second end caused by the voltage drop, and the first end level generated by the power signal input into the first end is equal to the second end level generated by the compensation signal input into the second end, which can improve the uniformity of the display panel during display.

[0082] Exemplarily, the switching element of the embodiment can be a thin film transistor, the input end of the switching element can be the source of the thin film transistor, the output end of the switching element can be the drain of the thin film transistor, and the control end can be the gate of the thin film transistor.

[0083] In one specific example, the thin film transistor is turned on in response to a low-level signal and turned off in response to a high-level signal. In the crack test stage, when the gate is connected to the high-level signal, the input end and the output end of the switching element are in the off state, the connection circuit of the compensation signal is disconnected, and the crack detection line can be used for normal crack detection, without affecting the crack test.

[0084] When the gate is connected to the low-level signal, the input end 142 and the output end 143 of the switching element are in the on state. The input end 142 of the switching element receives the compensation signal output by the display driving chip 12, and the compensation signal passes through the output end 143 of the switching element and is input to the second end 112 of the power signal line 11 through the crack detection line 13, so that the power signal line 11 drives the display panel to display according to the power signal input through the first end 111 and the compensation signal input through the second end 112.

[0085] In one specific example, the level of the power signal input through the first end of the power signal line is 5V. Due to the voltage drop of the metal trace, the power signal at the second end of the power signal line is about 4.8V. In order to compensate for the voltage drop of the power signal from the first end to the second end by the compensation signal, the compensation signal output to the second end is also 5V, so that the level of the compensation signal is equal to the level of the power signal, thereby realizing that the power signals input through the two ends of the power signal line are equal, improving the problem of excessive voltage difference between the two ends of the power signal line caused by voltage drop, and further improving the display uniformity of the display panel.

[0086] In another specific example, considering that the metal trace connected to the second end of the power signal line also has a voltage drop in actual application, that is, the level of the compensation signal transmitted to the second end through the metal trace is lower than the expected level of the compensation signal. Therefore, the level of the compensation signal of the embodiment is higher than the level of the power signal. Exemplarily, still taking the level of the power signal input through the first end of the power signal line as 5V as an example, the voltage drop from the compensation signal output end (display driving chip) to the second end is 0.2V through experiments and tests, and the level of the compensation signal is set to 5.2V, so that the level of the compensation signal output to the second end in the on state can compensate for the second end even after the voltage drop of the metal trace, so that the level of the second end after compensation by the compensation signal is the same as the level of the first end, realizing optimal voltage drop compensation and improving display uniformity.

[0087] In one specific example, a process of manufacturing a display panel according to an embodiment of the present application is exemplarily illustrated, which includes:

[0088] S1, forming a display area, the display area including a power signal line, the power signal line including a first end close to a display driving chip and a second end away from the display driving chip.

[0089] In one more specific example, a process of manufacturing a display panel according to an embodiment of the present application is exemplarily illustrated, which includes: Figure 1 As exemplarily shown in the display panel, the step S1 further includes: Figure 2 As exemplarily shown in the display panel, the step S1 further includes:

[0090] S11, forming a driving TFT transistor and a light emitting element driven by the driving TFT transistor in the display area AA, wherein the power signal line is disposed in the same layer as a source-drain electrode of the driving TFT transistor.

[0091] As exemplarily shown in the display panel, the step S1 further includes:

[0092] As exemplarily shown in the display panel, the step S1 further includes:

[0093] As exemplarily shown in the display panel, the step S1 further includes:

[0094] As exemplarily shown in the display panel, the step S1 further includes:

[0095] As exemplarily shown in the display panel, the step S1 further includes:

[0096] A planarization layer is formed to cover the source and drain layers.

[0097] An opening is formed on the planarization layer of the display area at a position corresponding to one of the source and drain electrodes, using a patterning process. The anode metal layer of the OLED is deposited in the opening and patterned to form the anode.

[0098] Next, a pixel-defining layer is formed around the anode using a patterning process.

[0099] Then, a light-emitting layer is formed on the anode in the opening of the pixel defining layer by inkjet printing or vapor deposition, and then a cathode is formed, thereby forming the various film layers of the light-emitting element.

[0100] At this point, the driving TFT transistors of the display area, the light-emitting elements driven by the driving TFT transistors, and the power signal lines are all formed.

[0101] S2. A non-display area BB is formed, the non-display area BB including: a metal trace 13 surrounding the power signal line 11, the metal trace 13 being electrically connected to the second terminal 112, wherein when the power signal line 11 receives a power signal from the display driver chip 12, the metal trace 13 sends a compensation signal to the second terminal 112 to compensate for the voltage drop of the power signal from the first terminal 111 to the second terminal 112.

[0102] In a more specific example, according to an embodiment of the present invention Figure 1 Taking the display panel shown as an example, Figure 3 It shows Figure 1 A schematic diagram of the layer structure within the dashed box C is shown. For example, step S2 further includes:

[0103] S21. A switching element 14, a crack detection line 13, a first compensation signal line 15, and a second compensation signal line 16 are formed in the non-display area BB. Figure 3 (The second compensation signal line 16, which is connected to the control terminal of the switching element, is not shown in the diagram).

[0104] For example, to save process steps, the switching element 14, the crack detection line 13, the first compensation signal line 15, and the second compensation signal line 16 can be formed simultaneously when the display area is manufactured.

[0105] For example, the switching element is the same type as the driving TFT transistor of the display area, such as... Figure 3 As shown, the switching element 14 includes an active layer 144 formed on the substrate 17, a gate insulating layer 145 covering the active layer, a gate (control terminal 141) located on the gate insulating layer, and an interlayer dielectric layer 146 covering the gate.

[0106] In the embodiment, the gate 141 (control end) of the switching element 14, the crack detection line 13 and the gate of the driving TFT transistor are arranged in the same layer. That is, when the film layer process of the driving TFT transistor is performed, for example, when the gate of the driving TFT transistor in the display area AA is made, the gate 141 of the switching element 14 and the crack detection line 13 in the non-display area BB can be formed by the same process.

[0107] Then, when the via hole exposing the active layer of the driving TFT transistor is etched in the interlayer dielectric layer of the display area, the interlayer dielectric layer 146 at the crack detection line 13 in the non-display area BB can also be etched at the same time to form the first via hole and the second via hole exposing the crack detection line, respectively.

[0108] Further, while the source-drain layer of the driving TFT transistor is formed on the interlayer dielectric layer of the display area, the source (input end 142) and the drain (output end 143) of the switching element 14, the first compensation signal line 15 and the second compensation signal line 16 can be formed on the interlayer dielectric layer 146 of the non-display area BB at the same time by the same process. That is, the source of the switching element and the drain of the switching element, the first compensation signal line and the second compensation signal line are arranged in the same layer as the source-drain electrode of the driving TFT transistor. In the embodiment, the source of the switching element is connected to the display driving chip (not shown in the figure 3) through the first compensation signal line to access the compensation signal of the display driving chip; the drain 143 of the switching element is electrically connected to the crack detection line 13 through the first via hole 1461 in the interlayer dielectric layer 146 between the source-drain layer and the gate, and the compensation signal is sent to the crack detection line 13 through the source 142 and the drain 143 in the on state under the driving of the gate driving signal of the switching element. The crack detection line 13 is electrically connected to the second end 112 of the power signal line through the second via hole 1462 to send the compensation signal to the second end of the power signal line.

[0109] It is worth noting that in the embodiment, the electrical connection between the drain of the switching element and the crack detection line and the electrical connection between the crack detection line and the second end of the power signal line are realized by forming the first via hole and the first via hole in the interlayer dielectric layer. The present application does not limit the specific position of the first via hole and the second via hole in the dielectric layer between the source-drain layer and the crack detection line, for example, the interlayer dielectric layer in the embodiment. Those skilled in the art can design according to the actual application, taking the design criteria of realizing the electrical connection between the drain of the switching element and the crack detection line and the electrical connection between the crack detection line and the second end of the power signal line through the first via hole and the first via hole as the design criteria, which will not be described here.

[0110] At this point, the related layer structure of the compensation circuit formed in the non-display area has been formed, and the formation of other film layers related to the non-display area can be performed according to the prior art. The film layers of the non-display area are formed at the same time as the film layers of the display area.

[0111] The process of the embodiment does not increase the process steps, and the switching element, the crack detection line, the first compensation signal line, and the second compensation signal line are formed by the same process as the film layers of the display area, which greatly guarantees the production efficiency. The display panel formed by the method has the advantages that the power signal input at the first end and the power signal input at the second end are equal by multiplexing the crack detection line, the two-end driving of the power signal line and the compensation of the remote power signal line are realized, the display uniformity of the display device is effectively improved, and the method has a wide application prospect.

[0112] For the above embodiment in which the crack detection line is multiplexed to perform second-end level compensation, it is considered that the function of the crack detection line is to be used for crack detection, and when the crack detection line is broken, the compensation circuit formed by the crack detection line has the risk of being disconnected, which causes the compensation to be ineffective.

[0113] Therefore, in another optional embodiment of the application, the display panel further comprises a touch layer; the metal trace is a protection line formed in the touch layer, wherein when the power signal line receives the power signal from the display driving chip, the protection line sends the compensation signal received from the touch driving chip to the second end.

[0114] In the embodiment, the metal trace 13 is a protection line of the touch layer 19, the compensation signal is output by a touch driving chip (not shown in the figure) of the touch layer, and the power signal is output by a display driving chip, that is, the power signal and the compensation signal of the embodiment are output by two chips respectively.

[0115] Figure 4 A structure diagram for compensating the second-end level by using the protection line of the touch layer is shown. As shown in Figure 4 The protection line 13 is arranged around the power signal line 11, and the protection line 13 is electrically connected to the second end 112 of the power signal line 11 at the second end 112 of the power signal line 11. In the embodiment, the protection line 13 of the touch layer and the second end 112 of the power signal line 11 form a compensation circuit to send the compensation signal output from the touch driving chip to the second end to perform compensation of the second end, and realize two-end driving of the power signal line, thereby improving the problem of excessive voltage difference between the first end and the second end caused by the voltage drop of the power signal line itself, and further improving the display uniformity of the display panel.

[0116] In order to achieve the best compensation effect, i.e. the closer the power signal received by the first end and the compensation signal received by the second end, the better the compensation effect, and the uniformity of the display can be improved, therefore, in an optional embodiment, the level of the compensation signal is set to be equal to the level of the first end, so as to achieve the best compensation effect.

[0117] In another specific example, considering that in practical applications, the protection line connected to the second end of the power signal line also has a voltage drop, i.e. the level of the compensation signal transmitted to the second end through the protection line is lower than the expected level of the compensation signal. Therefore, the level of the compensation signal of the present embodiment is higher than the level of the power signal, so as to achieve a better compensation effect in practical applications.

[0118] In a specific example, the layer structure of the display panel of the present embodiment in the non-display area is as shown in Figure 5 , which corresponds to the position at D section in the circuit schematic diagram as shown in Figure 4 . Now taking the layer structure as shown in Figure 5 , the process of manufacturing the display panel of the present embodiment is exemplarily illustrated as follows:

[0119] S1, forming a display area, the display area comprising a power signal line, the power signal line comprising a first end close to a display driving chip and a second end away from the display driving chip.

[0120] In an optional embodiment, the layer structure of the present embodiment is exemplarily illustrated as shown in Figure 5 , and the step S1 further comprises: Figure 6

[0121] S11, forming a driving TFT transistor, a light emitting element driven by the driving TFT transistor, an encapsulation layer and a touch layer in the display area, wherein the power signal line is disposed in the same layer as the source / drain electrode of the driving TFT transistor, and the touch layer comprises a first touch metal extending in a first direction, a second touch metal extending in a second direction intersecting the first direction, and an insulation layer between the first touch metal and the second touch metal.

[0122] Exemplarily, the process of forming the driving TFT transistor of the display panel of the present embodiment and the light emitting element driven by the driving TFT transistor is similar to the process of the last Figure 5 embodiment, i.e. the process exemplarily comprises: forming the driving TFT transistor and the light emitting element driven by the driving TFT transistor at the same time when forming each film layer of the display area. Figure 5 ​The substrate 17, gate insulating layer 145, and interlayer dielectric layer 146 of the non-display area are shown, and a power signal line 11 is formed on the same layer as the source and drain electrodes of the driving TFT transistor. This process can be carried out with reference to the previous embodiment. The principle and implementation method are similar, and will not be described again here.

[0123] Then, an encapsulation layer 18 and a touch layer 19 are formed on the film layer of the completed driving TFT transistor and the light-emitting element driven by the driving TFT transistor.

[0124] In a specific example, such as Figure 3 As shown, a planarization layer 20 is also formed on the display area and the non-display area. An encapsulation layer is further formed on the planarization layer 20. Exemplarily, the encapsulation layer is a composite encapsulation structure of an organic layer-inorganic layer-organic layer, which has better encapsulation performance.

[0125] Furthermore, taking the formation of a touch layer in a non-display area as an example, the steps for forming the touch layer further include:

[0126] A first touch metal 191 extending in a first direction is formed on the encapsulation layer 18;

[0127] An insulating layer 192 is formed covering the first touch metal 191, the insulating layer 192 exposing the first touch metal 191;

[0128] A second touch metal 193 is formed on the insulating layer 192, extending in a second direction that intersects the first direction, and the second touch metal 193 and the exposed first touch metal 191 are electrically connected.

[0129] In this example, we take the first direction as horizontal and the second direction as vertical. To enable touch functionality, for example, the second touch metal extending in the vertical direction is disconnected. By forming an electrical connection with the first touch metal, the touch function is realized and the voltage drop between the first and second touch metals is reduced.

[0130] After the above steps, the film layer structure of the display area of ​​the display panel with the touch layer in this embodiment is formed.

[0131] S2. A non-display area is formed, the non-display area including: a metal trace surrounding the power signal line, the metal trace being electrically connected to the second end, wherein when the power signal line receives a power signal from the display driver chip, the metal trace sends a compensation signal to the second end to compensate for the voltage drop of the power signal from the first end to the second end.

[0132] In an optional embodiment, this embodiment... Figure 5 The layer structure shown is an illustrative example, such as Figure 6As shown, the step S2 further comprises:

[0133] S21, forming a protection line in the touch layer of the non-display area, wherein the protection line is disposed in the same layer as the first touch metal, and the protection line is connected to the second end of the power signal line through a third via in the planarization layer between the touch layer and the driving TFT transistor.

[0134] In this example, the protection line 13 is disposed in the same layer as the first touch metal, and therefore, to save process steps, the protection line 13 of the non-display area can be formed at the same time as the first touch metal of the display area, that is, the first touch metal of the non-display area is the protection line 13 of this embodiment. Figure 5 As shown, the first touch metal 191 of the non-display area is the protection line 13 of this embodiment.

[0135] Further, when etching the insulating layer 192 on the first touch metal layer of the display area to expose the first touch metal 191, the etching of the insulating layer 192 on the protection line (i.e. Figure 5 As shown, the first touch metal 191) of the non-display area is performed at the same time, and the encapsulation layer of the non-display area, each film layer of the light emitting element, and part of the film layer of the driving TFT transistor are patterned to form a third via.

[0136] In one specific example, the pixel defining layer of the light emitting element and the planarization layer of the driving TFT transistor can be etched to form a third via. For example, as shown, Figure 5 As shown, the protection line 13 can be connected to the second end 112 of the power signal line 11 through the third via 21 in the planarization layer 20 between the touch layer 18 and the driving TFT transistor.

[0137] The present application does not limit other film layers of the touch layer, and those skilled in the art can design according to actual application, taking the protection line of this embodiment as the design criterion, which surrounds the power signal line in position and electrically connects the second end of the power signal line in function, and therefore, no further description is given here.

[0138] The process of this embodiment does not increase the process steps, and the processes of the protection line and the third via are formed at the same time as the processes of the display area, which greatly guarantees the production efficiency. This embodiment uses the protection line of the touch layer to form a compensation circuit with the second end of the power signal line, sends the compensation signal output from the driving touch chip to the second end for compensation of the second end, and realizes the driving of both ends of the power signal line, which not only improves the problem of excessive voltage difference between the first end and the second end caused by the voltage drop of the power signal line itself, but also improves the defect that cannot be compensated due to the crack of the display panel, and guarantees the success rate of compensation.

[0139] Considering the unforeseen circumstances of level compensation at the second end using only the crack detection line of one of the above embodiments, and the unforeseen circumstances of level compensation at the second end using only the protection line of one of the above embodiments, in another optional embodiment, such as Figure 7 As shown, the display panel 1 also includes a touch layer ( Figure 7 (not shown in the image), switching element 14, first compensation signal line 15, and second compensation signal line 16;

[0140] The metal trace 13 includes a crack detection line 131 surrounding the power signal line 11 and a protective line 132 formed in the touch layer surrounding the power signal line 11. The crack detection line 131 and the protective line 132 are connected in parallel to the second end 112.

[0141] in,

[0142] The control terminal 141 of the switching element receives the gate drive signal of the display driver chip 12;

[0143] The input terminal 142 of the switching element receives the compensation signal through the first compensation signal line 15;

[0144] The output terminal 143 of the switching element is connected to the crack detection line. When the gate drive signal is a conduction signal, the compensation signal is transmitted to the second terminal via the crack detection line.

[0145] When the power signal line receives a power signal from the display driver chip, the protection line sends a second compensation signal received from the touch driver chip to the second terminal.

[0146] like Figure 7 As shown, in this embodiment, a first compensation circuit is formed by electrically connecting the crack detection line 131 to the second end 112 of the power signal line 11. In this embodiment, a second compensation circuit is also formed by electrically connecting the protection line 132 to the second end 112 of the power signal line 11. The first compensation circuit and the second compensation circuit are connected in parallel. That is to say, the display panel of this embodiment can perform level compensation of the second end through the crack detection line or through the protection line. This setting can improve the compensation accuracy and compensation stability.

[0147] Furthermore, in an optional embodiment, the level of the first compensation signal is set such that the level of the second terminal is equal to the level of the first terminal; the level of the second compensation signal is set such that the level of the second terminal is equal to the level of the first terminal, thereby achieving the best compensation effect.

[0148] It is worth noting that in this embodiment... Figure 7For the schematic illustration of the two compensation circuits, the protection line, the crack detection line, the power signal line and the display driving chip are formed in the same or different film layers in the actual structure. The person skilled in the art designs the setting of the structure of each layer of the display panel according to the actual application, which will not be described here.

[0149] In one specific example, the structure schematic diagram shown in Figure 7 is taken as an example to exemplarily illustrate the process flow of the display panel of this embodiment, which includes:

[0150] S1, forming a display area, the display area including a power signal line, the power signal line including a first end close to a display driving chip and a second end away from the display driving chip.

[0151] In one optional embodiment, as shown in Figure 8 , the step S1 further includes:

[0152] S11, forming a driving TFT transistor, a light emitting element driven by the driving TFT transistor, an encapsulation layer and a touch layer in the display area, wherein the power signal line is disposed in the same layer as the source-drain electrode of the driving TFT transistor, and the touch layer includes a first touch metal extending in a first direction, a second touch metal extending in a second direction intersecting the first direction, and an insulation layer between the first touch metal and the second touch metal.

[0153] In one specific example, the process of forming the driving TFT transistor and the light emitting element driven by the driving TFT transistor in the display area can refer to the discussion of the embodiment shown in Figure 3 . The principle and flow of the process are similar to the foregoing embodiments, which will not be described here. In another specific example, the process of forming the encapsulation layer and the touch layer can refer to the discussion of the embodiment shown in Figure 5 . The principle and flow of the process are similar to the foregoing embodiments, which will not be described here.

[0154] S2, forming a non-display area, the non-display area including: a metal trace surrounding the power signal line, the metal trace being electrically connected to the second end, wherein when the power signal line receives a power signal from the display driving chip, the metal trace sends a compensation signal to the second end to compensate for the voltage drop of the power signal from the first end to the second end.

[0155] In one optional embodiment, as shown in Figure 8 , the step S2 further includes:

[0156] S21, forming a switching element, a crack detection line, a first compensation signal line, a second compensation signal line and a protection line in the touch layer in the non-display area.

[0157] In an optional embodiment, the gate of the switching element, the crack detection line and the gate of the driving TFT transistor are arranged in the same layer, the source and the drain, the first compensation signal line and the second compensation signal line are arranged in the same layer as the source and the drain of the driving TFT transistor; the source of the switching element is connected to the display driving chip through the first compensation signal line, the drain is connected to the crack detection line through the first via in the medium layer between the source and the drain layer and the gate layer, and the crack detection line is connected to the second end through the second via in the medium layer.

[0158] In a specific example, the process of forming the switching element, the crack detection line, the first compensation signal line and the second compensation signal line in the non-display area can refer to the discussion of the embodiment shown in Figure 3 The principle and process of the process are similar to the foregoing embodiments, and will not be described here again.

[0159] The protection line is arranged in the same layer as the first touch metal, and the protection line is connected to the second end through the third via in the planarization layer between the touch layer and the driving TFT transistor.

[0160] In another specific example, the process of forming the protection line and the third via can refer to the discussion of the embodiment shown in Figure 5 The principle and process of the process are similar to the foregoing embodiments, and will not be described here again.

[0161] The process of the embodiment does not increase the process steps, and the processes of the switching element, the crack detection line, the first compensation signal line, the second compensation signal line, the protection line and the third via are formed at the same time as the processes of the display area, which greatly guarantees the production efficiency. The display panel of the embodiment can compensate the level of the second end through the crack detection line, and can also compensate the level of the second end through the protection line. The setting mode can improve the compensation accuracy and the compensation stability.

[0162] Another embodiment of the application provides a manufacturing method of a display panel, comprising:

[0163] forming a display area, the display area comprising a power signal line, the power signal line comprising a first end close to a display driving chip and a second end away from the display driving chip;

[0164] forming a non-display area, the non-display area comprising: a metal trace surrounding the power signal line, the metal trace being electrically connected to the second end, wherein when the power signal line receives a power signal from the display driving chip, the metal trace sends a compensation signal to the second end to compensate for the voltage drop of the power signal from the first end to the second end.

[0165] Since the display panel manufacturing method provided by the embodiment of the present application corresponds to the display panel provided by the above-mentioned several embodiments, the display panel manufacturing method provided by the present embodiment is also applicable to the foregoing embodiments, and will not be described in detail in the present embodiment. It should be known by those skilled in the art that the foregoing embodiments and the beneficial effects brought by them are also applicable to the present embodiment, and therefore, the same parts will not be described again.

[0166] Another embodiment of the present application provides a display device comprising the display panel as described in the above embodiments. Exemplarily, the display device can be any product or component requiring display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, a vehicle-mounted central control file handle, etc., and the embodiments of the present application are not limited thereto.

[0167] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, on the basis of the above description, other different forms of changes or variations can also be made, and it is impossible to enumerate all the embodiments here. Any changes or variations falling within the scope of the technical solutions of the present application are still within the protection scope of the present application.

Claims

1. A display panel, characterized by: The display panel comprises a display area and a non-display area surrounding the display area, wherein, the display area comprises a power signal line, the power signal line comprising a first end close to a display driving chip and a second end away from the display driving chip; the non-display area comprises: a metal trace surrounding the power signal line, the metal trace comprising a crack detection line and / or a protection line formed in a touch layer, the metal trace being electrically connected to the second end, wherein, when the power signal line receives a power signal from the display driving chip, the metal trace is configured to receive a compensation signal from the display driving chip and / or a touch driving chip of the display panel, and the metal trace sends the compensation signal to the second end to compensate for voltage drop of the power signal from the first end to the second end.

2. The display panel of claim 1, wherein, the metal trace is a crack detection line; the display panel further comprises a switch element, a first compensation signal line, and a second compensation signal line, wherein, a control end of the switch element receives a gate driving signal of the display driving chip; an input end of the switch element receives the compensation signal through the first compensation signal line; an output end of the switch element is connected to the crack detection line; when the gate driving signal is a conductive signal, the compensation signal is transmitted to the second end via the crack detection line.

3. The display panel of claim 2, wherein, in a compensation phase, the gate driving signal is a conductive signal, and the switch element is turned on; in a crack detection phase, the gate driving signal is a cut-off signal, and the switch element is turned off.

4. The display panel of any one of claims 1-3, wherein, a level of the compensation signal is set such that a level of the second end is equal to a level of the first end.

5. The display panel of claim 1, wherein, the display panel further comprises a touch layer; the metal trace is a protection line formed in the touch layer, wherein, when the power signal line receives a power signal from the display driving chip, the protection line sends a compensation signal received from a touch driving chip to the second end.

6. The display panel of claim 5, wherein, a level of the compensation signal is set such that a level of the second end is equal to a level of the first end.

7. The display panel of claim 1, wherein, the display panel further comprises a touch layer, a switch element, a first compensation signal line, and a second compensation signal line; the metal trace comprises a crack detection line surrounding the power signal line and a protection line formed in the touch layer surrounding the power signal line, the crack detection line and the protection line being connected in parallel to the second end; wherein, a control end of the switch element receives a gate driving signal of the display driving chip; an input end of the switch element receives a first compensation signal through the first compensation signal line; an output end of the switch element is connected to the crack detection line, and when the gate driving signal is a conductive signal, the compensation signal is transmitted to the second end via the crack detection line. The protection line is configured to transmit the second compensation signal received from the touch driving chip to the second end when the power signal line receives the power signal from the display driving chip.

8. The display panel of claim 7, wherein, a level of the first compensation signal is set to make a level of the second end equal to a level of the first end; a level of the second compensation signal is set to make a level of the second end equal to a level of the first end.

9. A display device, characterized by comprising: The display panel of any one of claims 1-8.

10. A manufacturing method of a display panel, comprising: The display panel comprises: forming a display area, the display area comprising a power signal line, the power signal line comprising a first end close to a display driving chip and a second end away from the display driving chip; forming a non-display area, the non-display area comprising: a metal trace surrounding the power signal line, the metal trace comprising a crack detection line and / or a protection line formed in a touch layer, the metal trace being electrically connected to the second end, wherein the metal trace is configured to receive a compensation signal from the display driving chip and / or a touch driving chip of the display panel when the power signal line receives the power signal from the display driving chip, the metal trace transmitting the compensation signal to the second end to compensate for a voltage drop of the power signal from the first end to the second end.

11. The method of claim 10, wherein, The display panel comprises: forming a display area, the display area comprising a power signal line, the power signal line comprising a first end close to a display driving chip and a second end away from the display driving chip; forming a non-display area, the non-display area comprising: a metal trace surrounding the power signal line, the metal trace comprising a crack detection line and / or a protection line formed in a touch layer, the metal trace being electrically connected to the second end, wherein the metal trace is configured to receive a compensation signal from the display driving chip and / or a touch driving chip of the display panel when the power signal line receives the power signal from the display driving chip, the metal trace transmitting the compensation signal to the second end to compensate for a voltage drop of the power signal from the first end to the second end.

12. The method of claim 10, wherein, The display panel comprises: forming a display area, the display area comprising a power signal line, the power signal line comprising a first end close to a display driving chip and a second end away from the display driving chip; forming a non-display area, the non-display area comprising: a metal trace surrounding the power signal line, the metal trace comprising a crack detection line and / or a protection line formed in a touch layer, the metal trace being electrically connected to the second end, wherein the metal trace is configured to receive a compensation signal from the display driving chip and / or a touch driving chip of the display panel when the power signal line receives the power signal from the display driving chip, the metal trace transmitting the compensation signal to the second end to compensate for a voltage drop of the power signal from the first end to the second end.

13. The method of claim 10, wherein, The display panel comprises: forming a display area, the display area comprising a power signal line, the power signal line comprising a first end close to a display driving chip and a second end away from the display driving chip; forming a non-display area, the non-display area comprising: a metal trace surrounding the power signal line, the metal trace comprising a crack detection line and / or a protection line formed in a touch layer, the metal trace being electrically connected to the second end, wherein the metal trace is configured to receive a compensation signal from the display driving chip and / or a touch driving chip of the display panel when the power signal line receives the power signal from the display driving chip, the metal trace transmitting the compensation signal to the second end to compensate for a voltage drop of the power signal from the first end to the second end. Forming a driving TFT transistor, a light emitting element driven by the driving TFT transistor, an encapsulation layer, and a touch layer in the display area, wherein the power signal line is arranged in the same layer as the source-drain electrode of the driving TFT transistor, and the touch layer comprises a first touch metal extending in a first direction, a second touch metal extending in a second direction intersecting the first direction, and an insulation layer between the first touch metal and the second touch metal; Forming a switching element, a crack detection line, a first compensation signal line, a second compensation signal line, and a protection line in the touch layer in the non-display area, wherein The gate of the switching element, the crack detection line, and the gate of the driving TFT transistor are arranged in the same layer, and the source and the drain, the first compensation signal line, and the second compensation signal line are arranged in the same layer as the source-drain electrode of the driving TFT transistor; the source of the switching element is connected to the display driving chip through the first compensation signal line, the drain is connected to the crack detection line through the first via in the medium layer between the source-drain layer and the gate layer, and the crack detection line is connected to the second end through the second via in the medium layer; The protection line is arranged in the same layer as the first touch metal, and the protection line is connected to the second end through the third via in the planarization layer between the touch layer and the driving TFT transistor.

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