Blanking potential adjustment method, row driving circuit, and LED display device

Abstract

The present invention provides a blanking potential adjustment method, a row driving circuit, and an LED display device, the method being realized by a row driving module, and including the steps of: a row driving chip receiving an open circuit detection signal and a short circuit detection signal from a row driving side of an LED display panel; and, based on the open circuit detection signal and the short circuit detection signal, the row driving chip generating a control signal and transmitting it to the multiplexer, thereby controlling the multiplexer to select only the first voltage or the second voltage as the blanking potential, or to sequentially select the first voltage and the second voltage as the blanking potential, or to sequentially select the second voltage and the first voltage as the blanking potential, which can efficiently solve the long line lighting problem caused by open / short circuits of LED lamp beads, i.e., the open / short circuit caterpillar phenomenon.

Description

[Technical field]

[0001] [CROSS REFERENCE TO RELATED APPLICATIONS] This application claims priority to a Chinese patent application bearing application number 2020108099843 and entitled "Blanking potential adjustment method, row driving circuit and LED display device" filed with the China Patent Office on August 12, 2020, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of LED display driving circuits, and in particular to a blanking potential adjusting method, a row driving circuit and an LED display device. [Background technology]

[0003] In the prior art, flat displays include non-self-emissive flat displays and self-emissive flat displays, and liquid crystal displays are non-self-emissive flat displays that have been used for a long time, while organic light-emitting diode (OLED) displays and light-emitting diode (LED) displays are self-emissive flat displays that are currently widely used. Compared with liquid crystal displays, LED displays have many advantages such as high refresh rate, high contrast ratio, wide viewing angle, low power consumption, etc.

[0004] However, LED display panels in the prior art are often prone to the "caterpillar" phenomenon. The "caterpillar" phenomenon occurs when one or more LED assemblies in an LED display panel are damaged, causing a lamp bead to be short-circuited or open-circuited, which in turn affects other lamp beads in a row or column to be erroneously dimly lit. Such a "caterpillar" phenomenon affects the visual effect, and thus affects the user experience. Summary of the Invention [Means for solving the problem]

[0005] The embodiment of the present application provides a blanking potential adjusting method, which can effectively prevent the occurrence of the open-circuit caterpillar phenomenon or the short-circuit caterpillar phenomenon in the LED display panel.

[0006] The present application provides a blanking potential adjustment method, the method being implemented by a row driver circuit, the row driver circuit including at least one row driver chip, the row driver chip including a blanking potential generation circuit, the blanking potential generation circuit configured to generate a first voltage and a second voltage, the blanking potential generation circuit including a multiplexer, the method comprising: The row driver chip receives an open circuit detection signal and a short circuit detection signal from a row driver side of the LED display panel; and based on the open circuit detection signal and the short circuit detection signal, the row driver chip generates and transmits a control signal to the multiplexer, thereby controlling the multiplexer to select only the first voltage as the blanking potential, select only the second voltage as the blanking potential, sequentially select the first voltage and the second voltage as the blanking potential, or sequentially select the second voltage and the first voltage as the blanking potential, so as to cause at least one output channel of the row driver chip to output the blanking potential to the row driver side of the LED display panel.

[0007] In one embodiment, the blanking potential generating circuit further includes a voltage generating unit coupled to two signal input terminals of the multiplexer and configured to generate and transmit the first voltage and the second voltage to the two signal input terminals respectively.

[0008] In one embodiment, at least one output channel of the row driver chip transmits the blanking potential to at least one unscanned row of the row driver side, thereby setting the potential of at least one unscanned row to V DN >V DD -Vf to eliminate the short circuit caterpillar phenomenon caused by the short circuit of at least one LED assembly of said LED display panel, where VDD is the scanning voltage, and Vf is the forward conduction voltage of the LED assembly.

[0009] In one embodiment, at least one output channel of the row driving chip transmits the blanking potential to at least one non-scanned row on the row driving side, so that the potential of at least one non-scanned row is adjusted to V DN <Vout + Vf to remove the open-circuit caterpillar phenomenon caused by the open circuit of at least one LED assembly of the LED display panel, where Vout is the output voltage of the output channel.

[0010] In one embodiment, when the open-circuit detection signal and the short-circuit detection signal indicate that only the short-circuit caterpillar phenomenon exists in the LED display panel, the control signal controls the multiplexer to select only the first voltage as the blanking potential.

[0011] In one embodiment, when the open-circuit detection signal and the short-circuit detection signal indicate that only the open-circuit caterpillar phenomenon exists in the LED display panel, the control signal controls the multiplexer to select only the second voltage as the blanking potential.

[0012] When the open-circuit detection signal and the short-circuit detection signal indicate that both the short-circuit caterpillar phenomenon and the open-circuit caterpillar phenomenon exist in the LED display panel, the control signal controls the multiplexer to sequentially select the first voltage and the second voltage as the blanking potential based on a preset priority.

[0013] In one embodiment, when the priority of the first voltage is higher than the priority of the second voltage, and the open-circuit detection signal and the short-circuit detection signal indicate that both the short-circuit caterpillar phenomenon and the open-circuit caterpillar phenomenon exist in the LED display panel, the control signal controls the multiplexer to sequentially select the first voltage and the second voltage as the blanking potential.

[0014] In one embodiment, when the priority of the second voltage is higher than the priority of the first voltage, if the open circuit detection signal and the short circuit detection signal indicate that the short circuit caterpillar phenomenon and the open circuit caterpillar phenomenon exist simultaneously in the LED display panel, the control signal controls the multiplexer to sequentially select the second voltage and the first voltage as the blanking potential.

[0015] In one alternative embodiment, the short circuit detection signal is generated when the difference between the scan voltage and the original blanking potential is greater than the forward conduction voltage of the LED assembly.

[0016] In one alternative embodiment, the open circuit detection signal is generated when the output voltage of the output channel is less than the forward conduction voltage of the LED assembly.

[0017] The present application further provides a row driving circuit, the row driving circuit including at least one row driving chip, the row driving chip including a blanking potential generating circuit, and the row driving circuit configured to perform a blanking potential adjusting method according to an embodiment of the present application.

[0018] In one optional embodiment, the blanking potential generating circuit further includes a voltage generating unit coupled to two signal input terminals of the multiplexer and configured to generate and transmit the first voltage and the second voltage to the two signal input terminals respectively.

[0019] In one alternative embodiment, the blanking potential generating circuit further includes a register, the register configured to store the first voltage and the second voltage.

[0020] The present application further provides an LED display device, the device including: an LED display panel; a column driving circuit; a row driving circuit; and a display controller, the row driving circuit including at least one row driving chip, the row driving chip including a blanking potential generating circuit, and the row driving circuit configured to perform a blanking potential adjusting method according to an embodiment of the present application.

[0021] In the technical solution of the above embodiment of the present application, the row driver chip receives an open-circuit detection signal and a short-circuit detection signal from the row driver side of the LED display panel, and based on the open-circuit detection signal and the short-circuit detection signal, the row driver chip generates and transmits a control signal to the multiplexer, so as to control the multiplexer to select only the first voltage as the blanking potential, select only the second voltage as the blanking potential, select the first voltage and the second voltage as the blanking potential sequentially, or select the second voltage and the first voltage as the blanking potential sequentially, so as to make at least one output channel of the row driver chip output the blanking potential to the row driver side of the LED display panel, thereby effectively avoiding the occurrence of the open-circuit caterpillar phenomenon or the short-circuit caterpillar phenomenon in the LED display panel. [Brief description of the drawings]

[0022] In order to more clearly describe the technical solutions of the embodiments of the present application, the following briefly describes the drawings that need to be used in the embodiments of the present application.

[0023] [Figure 1] FIG. 1 is a schematic diagram of a prior art LED display. [Diagram 2] Figure 2 shows the short-circuit caterpillar phenomenon in an LED display panel. [Diagram 3] Figure 3 shows the open-circuit caterpillar phenomenon in an LED display panel. [Figure 4] FIG. 4 is a structural schematic diagram of an LED display device according to an embodiment of the present application. [Diagram 5] FIG. 5 is a structural schematic diagram of an LED display panel, a column driving circuit and a row driving circuit according to an embodiment of the present application. [Figure 6] FIG. 6 is a schematic diagram showing the structure of a blanking potential generating circuit according to an embodiment of the present invention. [Figure 7] FIG. 7 is a flowchart of a blanking potential adjusting method according to an embodiment of the present application. [Figure 8]FIG. 8 is a schematic diagram of a blanking potential adjusting method according to an embodiment of the present application for eliminating the short-circuit caterpillar phenomenon in an LED display panel. [Figure 9] FIG. 9 is a schematic diagram showing how the blanking potential adjusting method according to an embodiment of the present invention can be used to eliminate the open-circuit caterpillar phenomenon in an LED display panel. [Figure 10] FIG. 10 is a schematic diagram showing the structure of a blanking potential generating circuit according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] The technical solutions of the embodiments of the present application will be described below with reference to the drawings of the embodiments of the present application.

[0025] Since like reference numerals and letters denote like items in the following drawings, once an item is defined in one drawing, it need not be further defined and interpreted in subsequent drawings. Also, in the description of this application, terms such as "first", "second", etc. are merely for the purpose of distinction and description, and cannot be understood as indicating or implying relative importance.

[0026] Fig. 1 is a structural diagram of a prior art LED display. As shown in Fig. 1, the LED display 1a includes an LED display panel 11a, a column driver module 12a, a row driver module 13a, and a display controller 14a (timing controller). The row driver module 13a usually includes a number of row driver chips 131a, and the number of the row driver chips 131a is determined by the resolution of the LED display panel 11a and the number of output channels of the row driver chips 131a.

[0027] As shown in FIG. 1, the LED display panel 11a includes X×Y LED assemblies 111a, X column driving lines 112a, and Y row driving lines 113a. Each column driving line 112a has a column parasitic capacitance Cr, and each row driving line 113a has a row parasitic capacitance Cc. During normal operation, the column parasitic capacitance Cr and / or the row parasitic capacitance Cc will affect the display quality of the LED display 1a to a certain extent. Usually, in the prior art, the row driving assembly 13Pa (i.e., PMOS assembly) of the row driving chip 131a is coupled to a pull-down circuit, and when performing a row switching operation, the pull-down circuit generates a pull-down potential to quickly discharge the charge of the parasitic capacitance to achieve the row blanking effect.

[0028] FIG. 2 shows the short-circuit caterpillar phenomenon of an LED display panel. When one or more LED assemblies 111a of the LED display panel 11a are damaged and the lamp beads are short-circuited, this lamp bead (i.e., the LED assembly 111a) will affect other lamp beads in a row or column to erroneously light up dimly, and in the industry, this phenomenon is called the short-circuit caterpillar. As shown in FIG. 2, when the lamp beads are short-circuited, the LED assemblies 111a in the same row form the channel shown in FIG. 1 when scanning the row, and at this time, the point V DD and point V DN and is greater than the lighting voltage of the LED assembly 111a, a row-long lighting phenomenon will be formed. Therefore, to avoid this problem from occurring, the circuit design of the row driver chip 131a needs to provide a blanking potential, so that at least one output channel of the row driver chip 131a realizes the row blanking effect.

[0029] 3 shows the open-circuit caterpillar phenomenon of the LED display panel. When one or more LED assemblies 111a of the LED display panel 11a are broken and the lamp bead is open-circuited, this lamp bead (i.e., the LED assembly 111a) will affect other lamp beads in a row or column to be erroneously lit dimly, and this phenomenon is called open-circuit caterpillar in the industry. As shown in FIG. 3, when a lamp bead is open-circuited, it will light up the lamp bead (LED assembly 111a) to pull down the output voltage Vout of the corresponding output channel of the row driver chip 131a to below 0.5V, and at this time, the potential of the unscanned row will be V DN Because -Vout>Vf, other LED assemblies 111a in the same row and adjacent to the lamp bead are lit, forming an open-circuit caterpillar. Therefore, to avoid this problem from occurring, the circuit design of the row driver chip 131a needs to provide another blanking potential, so that at least one output channel of the row driver chip 131a realizes the row blanking effect.

[0030] As can be seen from the above description, there is an urgent need in the art for a new blanking potential adjustment method. Therefore, the embodiments of the present application provide a blanking potential adjustment method, a row driving circuit and an LED display device, which can effectively prevent the occurrence of the open-circuit caterpillar phenomenon or the short-circuit caterpillar phenomenon in the LED display panel.

[0031] FIG. 4 is a structural schematic diagram of an LED display device according to an embodiment of the present application. As shown in FIG. 4, the LED display device 1 includes an LED display panel 11, a column driving circuit 12, a row driving circuit 13, and a display controller 14 (or a timing controller). The row driving circuit 13 usually includes a plurality of row driving chips 131, and the number of the row driving chips 131 used is determined by the resolution of the LED display panel 11 and the number of output channels of the row driving chips 131. Meanwhile, the LED display panel 11 includes X×Y LED assemblies 111, X column driving lines 112, and Y row driving lines 113. Each column driving line 112 has a column parasitic capacitance Cr, and each row driving line 113 has a row parasitic capacitance Cc.

[0032] 5 is a structural schematic diagram of an LED display panel 11, a column driver circuit 12 and a row driver circuit 13 according to an embodiment of the present application. A blanking potential generating circuit 1310 is provided inside the row driver chip 131, and is configured to perform the blanking potential adjusting method according to the embodiment of the present application.

[0033] 6 is a schematic diagram of a blanking potential generating circuit according to an embodiment of the present application. As shown in FIG. 6, the blanking potential generating circuit 1310 generates a first voltage V DNS and the second voltage V DNO The blanking potential generating circuit 1310 further includes a multiplexer 1312, which includes two signal input terminals, one control terminal and one signal output terminal. The two signal input terminals of the multiplexer 1312 are respectively connected to a first voltage V DNS output terminal and the second voltage V DNO and the control terminal is configured to receive a control signal Sel.

[0034] 7 is a flow chart of a blanking potential adjusting method according to an embodiment of the present application. As shown in FIG. 6, the process of the method first executes step S1 in which the row driver chip receives an open circuit detection signal and a short circuit detection signal from the row driver side of the LED display panel. Then, the process of the method executes step S2 in which the row driver chip generates a control signal and transmits it to the multiplexer based on the open circuit detection signal and the short circuit detection signal, thereby controlling the multiplexer to select only the first voltage as the blanking potential, select only the second voltage as the blanking potential, select the first voltage and the second voltage as the blanking potential sequentially, or select the second voltage and the first voltage as the blanking potential sequentially, so as to make at least one output channel of the row driver chip output the blanking potential to the row driver side of the LED display panel.

[0035] Scan voltage V DDand the original blanking potential is greater than the forward conduction voltage Vf of the LED assembly, the short circuit detection signal is generated. When the output voltage Vout of the output channel is less than the forward conduction voltage Vf of the LED assembly, the open circuit detection signal is generated.

[0036] In the technical solution of the above embodiment of the present application, the row driver chip receives an open-circuit detection signal and a short-circuit detection signal from the row driver side of the LED display panel, and based on the open-circuit detection signal and the short-circuit detection signal, the row driver chip generates and transmits a control signal to the multiplexer, so as to control the multiplexer to select only the first voltage as the blanking potential, select only the second voltage as the blanking potential, select the first voltage and the second voltage as the blanking potential sequentially, or select the second voltage and the first voltage as the blanking potential sequentially, so as to make at least one output channel of the row driver chip output the blanking potential to the row driver side of the LED display panel, thereby effectively avoiding the occurrence of the open-circuit caterpillar phenomenon or the short-circuit caterpillar phenomenon in the LED display panel.

[0037] 8 is a schematic diagram of a method for adjusting blanking potential according to an embodiment of the present application for eliminating the short-circuit caterpillar phenomenon of an LED display panel. When one or more LED assemblies 111 of an LED display panel 11 are damaged and the lamp beads are short-circuited, the lamp beads (i.e., the LED assemblies 111) affect other lamp beads in a row or column to erroneously light up dimly, and this phenomenon is called short-circuit caterpillar in the industry. As shown in FIG. 8, when the lamp beads are short-circuited, the LED assemblies 111 in the same column form a channel as shown in FIG. 8 when scanning the row, and at this time, the point V DD and point V DNWhen the voltage difference between the blanking potential V and the blanking potential V (original blanking potential, i.e., the blanking potential value before detecting the short circuit) is greater than the lighting voltage of the LED assembly 111, a long string of lighting phenomenon is formed. Therefore, when the step S2 of the corresponding embodiment of FIG. 7 is performed, the open circuit detection signal and the short circuit detection signal indicate that the short circuit caterpillar phenomenon exists in the LED display panel 11, and at this time, the control signal Sel is set to the multiplexer 1312 to the first voltage V DNS Only the blanking potential V DN , and at least one output channel of the row driver chip 131 transmits a blanking potential to at least one unscanned row of the row driver side, thereby selecting the potential of the unscanned row as a blanking potential V DN and V DN >V DD In this way, the short-circuit caterpillar phenomenon caused by the short circuit of at least one LED assembly of the LED display panel occurs when the potential of the non-scanned rows is equal to or lower than the blanking potential V DN and V DN >V DD -Vf, where V DD is the scan voltage, and Vf is the forward conduction voltage of the LED assembly.

[0038] 9 is a schematic diagram of the blanking potential adjustment method according to an embodiment of the present application for eliminating the open-circuit caterpillar phenomenon in an LED display panel. When one or more LED assemblies 111 of the LED display panel 11 are broken and the lamp bead is open-circuited, this lamp bead (i.e., the LED assembly 111) will affect other lamp beads in a row or column to be erroneously lit dimly, and this phenomenon is called open-circuit caterpillar in the industry. When the open-circuit caterpillar phenomenon occurs, the output voltage Vout of the corresponding output channel of the row driver chip 131 is pulled down to 0.5V or less (i.e., less than Vf). Therefore, when step S2 of the corresponding embodiment of FIG. 7 is performed, the open-circuit detection signal and the short-circuit detection signal indicate that the open-circuit caterpillar phenomenon exists in the LED display panel 11, and at this time, the control signal Sel indicates that the multiplexer 1312 is connected to the second voltage V DNO Blanking potential VDN is controlled to be selected, and at least one output channel of the row driving chip 131 transmits the blanking potential V DN to at least one non-scanned row on the row driving side, thereby adjusting the potential of the non-scanned row to the blanking potential V DN , and V DN <Vout + Vf. In this way, the open-circuit caterpillar phenomenon caused by the open circuit of at least one LED assembly of the LED display panel is suppressed or eliminated because the potential of the non-scanned row is adjusted to the blanking potential V DN , and V DN <Vout + Vf. Here, Vout is the output voltage of the output channel.

[0039] FIG. 10 is a structural schematic diagram of a blanking potential generation circuit according to another embodiment of the present application. As shown in FIG. 10, the blanking potential generation circuit 1310 may further include a register 1313. The register 1313 is installed in the voltage generation unit 1311 and is configured to store the first voltage V DNS and the second voltage V DNO . As will be described, the priorities of the first voltage V DNS and the second voltage V DNO are stored in the register 1313, so that the multiplexer 1312 can sequentially select the first voltage and the second voltage as the blanking potential based on a preset priority.

[0040] In one embodiment, with this installation, the row driving chip 131 may preferentially eliminate the short-circuit caterpillar phenomenon. When it is detected that there is a short-circuit caterpillar phenomenon in the LED display panel 11, the multiplexer 1312 selects the first voltage V DNS from the register 1313 as the blanking potential V DN , and transmits the blanking potential to at least one non-scanned row on the row driving side through at least one output channel of the row driving chip 131, thereby adjusting the potential of the non-scanned row to the blanking potential V DN , and V DN >V DDLet it be -Vf.

[0041] In one embodiment, when the register 1313 is used, by default, the line driving chip may preferentially remove the open-circuit caterpillar phenomenon. When it is detected that there is an open-circuit caterpillar phenomenon in the LED display panel 11, the multiplexer 1312 selects the second voltage V DNO as the blanking potential V DN and transmits the blanking potential to at least one non-scanned line on the line driving side through at least one output channel of the line driving chip 131, so as to adjust the potential of the non-scanned line to the blanking potential V DN and let V DN <Vout + Vf. Here, the register 1313 functions as a data buffer, the multiplexer 1312 functions as a data selector, and under the control of the control signal Sel, it selects and outputs the required data from the data buffer.

[0042] In one embodiment, when the register 1313 is used, by default, the line driving chip 131 may sequentially remove the open-circuit caterpillar phenomenon and the short-circuit caterpillar phenomenon. Specifically, if the priority of the second voltage is higher than that of the first voltage, the multiplexer 1312 is controlled using the control signal Sel. First, the second voltage V DNO is selected from the register 1313, and the blanking potential is transmitted to at least one non-scanned line on the line driving side through at least one output channel of the line driving chip 131, so as to adjust the potential of the non-scanned line to the blanking potential V DN and let V DN <Vout + Vf to remove the open-circuit caterpillar phenomenon. Then, the multiplexer 1312 is controlled using the control signal Sel, and subsequently, the first voltage V DNS is selected from the register 1313, and the blanking potential is transmitted to at least one non-scanned line on the line driving side through at least one output channel of the line driving chip 131, so as to adjust the potential of the non-scanned line to the blanking potential V DN and let V DN >VDD Remove the short-circuit crosstalk phenomenon as -Vf.

[0043] In one embodiment, when the register 1313 is used, the line driving chip 131 may sequentially remove the short-circuit crosstalk phenomenon and the open-circuit crosstalk phenomenon by default. Specifically, if the priority of the first voltage is higher than that of the second voltage, the multiplexer 1312 is controlled using the control signal Sel, and first, the first voltage V DNS is selected from the register 1313, and a blanking potential is transmitted to at least one output channel of the line driving chip 131 to at least one un-scanned line on the line driving side, so that the potential of the un-scanned line is adjusted to the blanking potential V DN , and V DN > V DD -Vf can be used to remove the short-circuit crosstalk phenomenon. Then, the multiplexer 1312 is controlled using the control signal Sel, and subsequently, the second voltage V DNO is selected from the register 1313, and a blanking potential is transmitted to at least one output channel of the line driving chip 131 to at least one un-scanned line on the line driving side, so that the potential of the un-scanned line is adjusted to the blanking potential V DN , and V DN < Vout + Vf is used to remove the open-circuit crosstalk phenomenon.

[0044] The embodiment of the present application further provides a line driving circuit, the line driving circuit includes at least one line driving chip, the line driving chip includes a blanking potential generation circuit, and the line driving circuit is configured to execute the blanking potential adjustment method according to the embodiment of the present application.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art can make various changes and modifications to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0046] The blanking potential adjusting method, row driving circuit, and LED display device according to the present application can effectively prevent the occurrence of the open-circuit caterpillar phenomenon or the short-circuit caterpillar phenomenon in the LED display panel. [Explanation of symbols]

[0047] 1—LED device, 11—LED display panel, 111—LED assembly, 112—column driving line, 113—row driving line, 12—column driving circuit, 13—row driving circuit, 131—row driving chip, 1310—blanking potential generating circuit, 1311—voltage generating unit, 1312—multiplexer, 1313—register, 14—display controller.

Claims

1. 1. A blanking potential adjustment method, the method being implemented by a row driver circuit, the row driver circuit including at least one row driver chip, the row driver chip including a blanking potential generation circuit, the blanking potential generation circuit configured to generate a first voltage and a second voltage different from the first voltage, the blanking potential generation circuit including a multiplexer, the method comprising: The row driver chip receives an open circuit detection signal and a short circuit detection signal from a row driver side of the LED display panel; and based on the open circuit detection signal and the short circuit detection signal, a row driver chip generates and transmits a control signal to the multiplexer to control the multiplexer to select only the first voltage as a blanking potential, select only the second voltage as a blanking potential, sequentially select the first voltage and the second voltage as the blanking potential, or sequentially select the second voltage and the first voltage as the blanking potential, so as to cause at least one output channel of the row driver chip to output the blanking potential to a corresponding one of the row driver lines for discharging charges of a parasitic capacitance of a corresponding one of the row driver lines of the LED display panel; the LED display panel includes X×Y LED assemblies each including one LED, X column driving lines and Y row driving lines, each of the Y row driving lines being connected to a cathode of an LED assembly arranged in a corresponding row and connected to the row driving chip at a row driving side of the LED display panel; generating the open circuit detection signal when the output voltage of the output channel is less than a forward voltage drop of the LED assembly; The blanking potential adjustment method, characterized in that the first voltage is greater than the difference between V DD and Vf, and the second voltage is less than the sum of Vout and Vf, V DD is a scanning voltage, Vout is an output voltage of a corresponding one of at least one output channel, and Vf is a forward voltage drop of each of the LED assemblies.

2. 2. The blanking potential adjusting method according to claim 1, wherein the blanking potential generating circuit further includes a voltage generating unit, the voltage generating unit being coupled to two signal input terminals of the multiplexer and configured to generate and transmit the first voltage and the second voltage to the two signal input terminals respectively.

3. At least one output channel of the row driver chip transmits the blanking potential to at least one non-scanned row of the row driver side, thereby adjusting the potential of at least one non-scanned row to a blanking potential, thereby eliminating the LED false lighting phenomenon caused by the short circuit of at least one of the LED assemblies of the LED display panel, wherein: DN >V DD -Vf, V DN is the blanking potential selected as the first voltage, V DD 2. The blanking potential adjusting method according to claim 1, wherein: is a scanning voltage applied to the anode of the corresponding LED assembly.

4. At least one output channel of the row driver chip transmits the blanking potential to at least one non-scanned row of the row driver side, thereby adjusting the potential of at least one non-scanned row to the blanking potential, thereby eliminating the LED false lighting phenomenon caused by the open circuit of at least one of the LED assemblies of the LED display panel, wherein: DN <Vout+Vf, and V DN 2. The method of claim 1, wherein the blanking potential is selected as the second voltage.

5. The blanking potential adjustment method according to any one of claims 1 to 4, characterized in that when the open circuit detection signal and the short circuit detection signal indicate that there is only an LED erroneous lighting phenomenon caused by a short circuit of at least one of the LED assemblies in the LED display panel, the control signal controls the multiplexer to select only the first voltage as the blanking potential.

6. The blanking potential adjustment method according to any one of claims 1 to 4, characterized in that when the open circuit detection signal and the short circuit detection signal indicate that there is only an LED false lighting phenomenon caused by an open circuit of at least one of the LED assemblies in the LED display panel, the control signal controls the multiplexer to select only the second voltage as the blanking potential.

7. The blanking potential adjustment method according to any one of claims 1 to 6, characterized in that when the open circuit detection signal and the short circuit detection signal indicate that an LED erroneous lighting phenomenon caused by a short circuit of at least one of the LED assemblies and an LED erroneous lighting phenomenon caused by an open circuit of at least one of the LED assemblies simultaneously exist in the LED display panel, the control signal controls the multiplexer to sequentially select the first voltage and the second voltage as the blanking potential based on a preset priority.

8. 8. The blanking potential adjusting method according to claim 7, wherein when the priority of the first voltage is higher than the priority of the second voltage, if the open circuit detection signal and the short circuit detection signal indicate that the LED erroneous lighting phenomenon caused by a short circuit of at least one of the LED assemblies and the LED erroneous lighting phenomenon caused by an open circuit of at least one of the LED assemblies simultaneously exist in the LED display panel, the control signal controls the multiplexer to sequentially select the first voltage and the second voltage as the blanking potential.

9. 8. The blanking potential adjusting method according to claim 7, wherein when the priority of the second voltage is higher than the priority of the first voltage, if the open circuit detection signal and the short circuit detection signal indicate that the LED erroneous lighting phenomenon caused by a short circuit of at least one of the LED assemblies and the LED erroneous lighting phenomenon caused by an open circuit of at least one of the LED assemblies simultaneously exist in the LED display panel, the control signal controls the multiplexer to sequentially select the second voltage and the first voltage as the blanking potential.

10. The blanking potential adjusting method according to any one of claims 1 to 9, characterized in that the short circuit detection signal is generated when a difference between a scanning voltage and an original blanking potential is greater than a forward voltage drop of the LED assembly.

11. A row driver circuit comprising at least one row driver chip, the row driver chip comprising a blanking potential generating circuit, the row driver circuit being configured to perform the blanking potential adjustment method according to any one of claims 1 to 10.

12. 12. The row driving circuit of claim 11, wherein the blanking potential generating circuit further includes a voltage generating unit coupled to two signal input terminals of the multiplexer and configured to generate and transmit the first voltage and the second voltage to the two signal input terminals respectively.

13. 12. The row driver circuit of claim 11, wherein the blanking potential generating circuit further comprises a register, the register being configured to store the first voltage and the second voltage.

14. 9. An LED display device comprising: an LED display panel; a column driver circuit; a row driver circuit; and a display controller, the row driver circuit comprising at least one row driver chip, the row driver chip comprising a blanking potential generating circuit, the row driver circuit configured to perform the blanking potential adjusting method according to any one of claims 1 to 8.

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