CN113012626A

CN113012626A - Display control method of LED display screen

Info

Publication number: CN113012626A
Application number: CN202010976570.XA
Authority: CN
Inventors: 周满城; 齐二龙; 田博仁
Original assignee: Chongqing Kangjia Photoelectric Technology Research Institute Co Ltd
Current assignee: Chongqing Kangjia Photoelectric Technology Research Institute Co Ltd
Priority date: 2020-09-15
Filing date: 2020-09-15
Publication date: 2021-06-22
Anticipated expiration: 2040-09-15
Also published as: CN113012626B

Abstract

The invention relates to a display control method of an LED display screen, wherein the LED display screen comprises a display array, the display array comprises a plurality of row lines and a plurality of column lines, LEDs are connected at the intersections of the row lines and the column lines, each row line of the row lines is connected with a first power supply through a switching tube, and the row lines are connected with a voltage control unit, the method comprises the following steps: and discharging the voltage on the row line through the voltage control unit within a preset time before the switching tube of the row line is closed, so that the voltage on the row line is reduced to a target voltage, wherein the target voltage is greater than the threshold voltage of the LED. By adopting the technical scheme, the technical problem that the LED display screen has a ghost phenomenon during display in the related technology is solved.

Description

Display control method of LED display screen

Technical Field

The invention relates to the technical field of LEDs, in particular to a display control method of an LED display screen.

Background

With the development of small spacing, Light Emitting Diode (LED) display screens have made higher requirements for line driving, and have been developed from the implementation of pure Power Metal-Oxide-Semiconductor Field-Effect Transistor (P-MOSFET) to multifunctional line driving with higher integration and higher functions.

With the improvement of the function of the LED, the display effect is more on the first floor, but the problems derived from the display effect are not few. Due to the existence of parasitic capacitance on the row line, after the row is closed each time, the voltage on the row line cannot be released quickly, and when the next row is opened, the LED on the upper row generates a ghost phenomenon because the voltage difference between the voltage on the row line and the voltage on the data line is greater than the threshold voltage; in addition, due to the existence of parasitic capacitance on the column line, the actual display effect of the setting effect is not matched, and the abnormal picture display problem occurs.

Therefore, it is an urgent need to solve the problem of the prior art that the LED display screen will generate ghost image during displaying.

Disclosure of Invention

In view of the above-mentioned deficiencies of the prior art, the present application aims to provide a display control method for an LED display panel, which aims to solve the problem that the LED display panel will generate a ghost phenomenon during displaying.

According to an aspect of an embodiment of the present invention, a display control method for an LED display screen is provided, where the LED display screen includes a display array, the display array includes a plurality of row lines and a plurality of column lines, where intersections of the plurality of row lines and the plurality of column lines are connected to LEDs, each of the plurality of row lines is connected to a first power supply through a switching tube, and the plurality of row lines are connected to a voltage control unit, and the method includes: and discharging the voltage on the row line through the voltage control unit within a preset time before the switching tube of the row line is closed, so that the voltage on the row line is reduced to a target voltage, wherein the target voltage is greater than the threshold voltage of the LED.

According to the invention, for the LED display screen, the LED display screen comprises a display array, the display array comprises a plurality of row lines and a plurality of column lines, LEDs are connected at the intersections of the row lines and the column lines, each row line of the row lines is connected with a first power supply through a switch tube, the row lines are connected with a voltage control unit, and in the process of carrying out display control on the LEDs of the LED display screen, the voltage on the row line where the LEDs are located can be discharged through the voltage control unit within the preset time before the switch tubes of the row lines are turned off, so that the voltage on the row lines is reduced to a target voltage, wherein the target voltage is greater than the threshold voltage of the LEDs. In this way, because in the predetermined duration before the switch tube of rowline closes, make the voltage on the rowline that LED belongs to descend to the target voltage through voltage control unit, this target voltage is greater than LED's threshold voltage, and, this target voltage not only can guarantee that LED shines, but also can make parasitic capacitance on the rowline that LED belongs to begin to discharge from above-mentioned target voltage when the aforesaid is predetermine the duration and finishes, make the electric charge on the parasitic capacitance can be more quick by the release, make LED can not charged and light in order to produce the ghost phenomenon by the parasitic capacitance, the technical problem that the ghost phenomenon can appear when showing of LED display screen has been solved.

Optionally, the voltage control unit includes a plurality of voltage control subunits, each of the plurality of row lines is connected to one of the plurality of voltage control subunits, and the voltage on the row line is discharged by the voltage control unit within a preset time period before the switching tube of the row line is turned off, so that the voltage on the row line is reduced to a target voltage, including: and discharging the voltage on the first row line through a voltage control subunit within a preset time before a switching tube of the first row line is turned off, so that the voltage on the first row line is reduced to a target voltage, wherein the first row line is a row line connected with the voltage control subunit.

Optionally, the discharging the voltage on the first row line through the voltage control subunit within the preset time period before the switching tube of the first row line is turned off, so that the voltage on the first row line is reduced to the target voltage, including: starting at a preset time point before a switching tube of the first column line is turned off, and sending a first charge discharging signal to a first charge discharging unit of the voltage control subunit under the condition that a first voltage detecting unit of the voltage control subunit monitors that the voltage of the first column line is greater than the target voltage; when the first charge draining unit of the voltage control subunit receives the first charge draining signal, draining the charge of the first column line so as to reduce the voltage of the first column line to the target voltage; wherein, the voltage control subunit includes: the first voltage detecting unit and the first charge draining unit are connected to the first column line, and the first voltage detecting unit and the first charge draining unit are connected to the first charge draining unit.

Optionally, the discharging the voltage on the first row line through the voltage control subunit within the preset time period before the switching tube of the first row line is turned off, so that the voltage on the first row line is reduced to the target voltage, including: starting at a preset time point before the switching tube of the first column line is turned off, and sending the first charge discharging signal to a control end of a first switching tube of the first charge discharging unit under the condition that the first voltage detecting unit monitors that the voltage of the first column line is greater than the target voltage; when the first switching tube of the first charge bleeding unit receives the first charge bleeding signal and the first switching tube is closed based on the first charge bleeding signal, the first switching tube and the first resistor bleed off the charge on the first column line to reduce the voltage on the first column line to the target voltage; the first charge bleeding unit includes the first switch tube and the first resistor, a first end of the first switch tube is connected to the first column line, a second end of the first switch tube is connected to the first end of the first resistor, a control end of the first switch tube is connected to the first voltage detecting unit, and a second end of the first resistor is connected to a second power supply.

Optionally, the voltage control unit includes a multiplexing unit, a second voltage detecting unit, and a second charge draining unit; the multiplexer is connected to the plurality of column lines, the second voltage detector and the second charge draining unit, the second voltage detector is connected to the second charge draining unit and a third power source, and the multiplexer further includes: determining a second row line by the multi-path selection unit; after a preset time point before a switching tube of the second column line is turned off, sending a second charge discharging signal to the second charge discharging unit under the condition that the second voltage detecting unit monitors that the voltage of the second column line is greater than the target voltage; and when the second charge draining unit receives the second charge draining signal, draining the charge on the second row line so as to reduce the voltage of the second row line to the target voltage.

Optionally, the bleeding off the charge on the second row line to lower the voltage of the second row line to the target voltage includes: when the second voltage detecting unit detects that the voltage of the second column line is greater than the target voltage, the second voltage detecting unit sends the second charge discharging signal to the control end of the second switch tube of the second charge discharging unit; when the second switch tube of the second charge draining unit receives the second charge draining signal and the second switch tube is closed based on the second charge draining signal, the charge on the second row line is drained through the second switch tube and a second resistor, and the voltage on the second row line is reduced to the target voltage; the second charge discharging unit includes the second switch tube and the second resistor, a first end of the second switch tube is connected to the second column line, a second end of the second switch tube is connected to a first end of the second resistor, a control end of the second switch tube is connected to the second voltage detecting unit, and a second end of the second resistor is connected to a second power supply.

According to another aspect of the embodiments of the present invention, there is provided a display control device of an LED display screen, where the LED display screen includes a display array, the display array includes a plurality of row lines and a plurality of column lines, where intersections of the plurality of row lines and the plurality of column lines are connected with LEDs, each of the plurality of row lines is connected to a first power supply through a switching tube, and the plurality of row lines are connected to a voltage control unit, and the display control device includes: and the first processing unit is used for discharging the voltage on the row line through the voltage control unit within a preset time length before the switching tubes of the row line are closed, so that the voltage on the row line is reduced to a target voltage, wherein the target voltage is greater than the threshold voltage of the LED.

According to another aspect of the embodiments of the present invention, there is provided an LED display screen including: the display array comprises a plurality of row lines and a plurality of row lines, LEDs are connected at the intersections of the row lines and the row lines, each row line in the row lines is connected with a first power supply through a switch tube, and the row lines are connected with a voltage control unit; the voltage control unit is used for controlling the voltage on the row line to be reduced to a target voltage within a preset time before the switching tube of the row line is closed, and the target voltage is greater than the threshold voltage of the LED.

Optionally, the voltage control unit includes a plurality of voltage control subunits, and each of the plurality of row lines is connected to one of the plurality of voltage control subunits; the voltage control subunit is configured to control, within a preset time period before a switching tube of a first column line is turned off, a voltage on the first column line to be reduced to the target voltage, where the first column line is a column line connected to the voltage control subunit.

Optionally, the voltage control subunit includes: a first voltage detection unit and a first charge draining unit, both of which are connected to the first column line, the first voltage detection unit being connected to the first charge draining unit; the first voltage detection unit is configured to send a first charge draining signal to the first charge draining unit when it is monitored that the voltage on the first column line is greater than the target voltage, starting at a preset time point before the switching tube of the first column line is turned off; the first charge draining unit is configured to drain charges on the first column line to reduce a voltage of the first column line to the target voltage when receiving the first charge draining signal.

Optionally, the first charge draining unit includes a first switch tube and a first resistor, a first end of the first switch tube is connected to the first column line, a second end of the first switch tube is connected to a first end of the first resistor, a control end of the first switch tube is connected to the first voltage detecting unit, and a second end of the first resistor is connected to a second power supply; the first voltage detection unit is configured to send the first charge bleeding signal to the control end of the first switch tube when it is monitored that the voltage on the first column line is greater than the target voltage, starting at a preset time point before the switch tube of the first column line is turned off; the first switch tube is closed based on the first charge leakage signal, so that the charge on the first row line is leaked through the first switch tube and the first resistor, and the voltage on the first row line is reduced to the target voltage.

Optionally, the voltage control unit includes a multiplexing unit, a second voltage detecting unit, and a second charge draining unit; the multi-channel selection unit is respectively connected with the plurality of column lines, the second voltage detection unit and the second charge draining unit, and the second voltage detection unit is connected with the second charge draining unit and a third power supply end; the multi-path selection unit is used for determining a second row line; the second voltage detection unit is configured to send a second charge draining signal to the second charge draining unit when it is monitored that the voltage on the second column line is greater than the target voltage, starting at a preset time point before the switching tube of the second column line is turned off; the second charge draining unit is used for draining the charges on the second row line under the condition of receiving the second charge draining signal so as to reduce the voltage of the second row line to the target voltage.

Optionally, the second charge draining unit includes a second switch tube and a second resistor, a first end of the second switch tube is connected to the second column line, a second end of the second switch tube is connected to a first end of the second resistor, a control end of the second switch tube is connected to the second voltage detecting unit, and a second end of the second resistor is connected to a second power supply; the second voltage detection unit is configured to send the second charge bleeding signal to the control end of the second switch tube when it is monitored that the voltage on the second column line is greater than the target voltage, starting at a preset time point before the switch tube of the second column line is turned off; the second switch tube is closed based on the second charge discharging signal, so that the charge on the second row line is discharged through the second switch tube and the second resistor, and the voltage on the second row line is reduced to the target voltage.

According to another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to execute the display control method of the LED display screen when running.

According to another aspect of the embodiments of the present invention, there is also provided an electronic apparatus, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the display control method of the LED display screen through the computer program.

Drawings

FIG. 1 is a schematic diagram of a control circuit and pulse sequence of an LED display screen in the related art;

FIG. 2 is a schematic diagram of a control circuit of another LED display screen in the related art;

FIG. 3 is a flow chart illustrating an alternative method for controlling the display of an LED display screen according to an embodiment of the present invention;

FIG. 4 is a schematic diagram (one) of an alternative display array of LED display screens according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of an alternative display array of LED display panels in accordance with an embodiment of the present invention;

FIG. 6 is a schematic diagram of an alternative voltage control subunit according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of an alternative voltage control subunit according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of an alternative voltage control subunit in accordance with an embodiment of the present invention;

FIG. 9 is a schematic diagram of an alternative voltage control unit according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of an alternative voltage control subunit according to an embodiment of the present invention;

FIG. 11 is a timing diagram illustrating the circuitry of an alternative display array for an LED display panel in accordance with an embodiment of the present invention;

FIG. 12 is a timing diagram of an alternative row (n) row line voltage circuit, according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of an alternative display control device of an LED display screen according to an embodiment of the present invention.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In the related art, with the development of small pitch, the LED display panel has a higher requirement for line driving, and the line driving is switched from a pure P-MOSFET to a multifunctional line driving with higher integration and higher function, for example, as shown in fig. 1, when a row (n) of the LED display panel is turned on, a column out (n) of the LED display panel outputs, an LED1 is turned on, and an out (n) waveform is pulse width modulation, and accordingly, the LED display panel can perform a scattering function, so that a refresh rate can be improved, and a function of the LED display panel is improved, so that a display effect of the LED display panel is better on the first floor, but problems derived from the display effect are not few. For example, as shown in fig. 2, due to the existence of the parasitic capacitance on the row line, after each row is turned off, the voltage on the row line cannot be released quickly, and when the next row is turned on, the LED on the previous row generates ghost images due to the fact that the voltage difference between the voltage on the row line and the voltage on the data line is greater than the threshold voltage, which will not match the set display, and abnormal display of the screen will occur.

Based on this, the present application intends to provide a solution to the above technical problem, the details of which will be explained in the following embodiments.

As shown in fig. 3, the present application provides a display control method of an LED display screen, where a flow of the display control method of the LED display screen may include the following steps:

step S302, discharging the voltage on the row line through a voltage control unit within a preset time before the switch tube of the row line is closed, so that the voltage on the row line is reduced to a target voltage, wherein the target voltage is greater than the threshold voltage of the LED.

Wherein, as shown in fig. 4, the above-mentioned LED display screen includes the display array, and the above-mentioned display array includes many rowlines and many row lines, and above-mentioned many rowlines are connected with LED with many row line intersections, and every rowline in above-mentioned many rowlines passes through the switch tube and is connected with first power, and above-mentioned many rowlines are connected with voltage control unit.

Optionally, to LED display screen, this LED display screen includes the display array, and above-mentioned display array includes many rowings and many row lines, and above-mentioned many rowings are connected with LED with above-mentioned many row line intersections, and every rowing in above-mentioned many rowings passes through the switch tube and is connected with first power, and above-mentioned many rowings are connected with voltage control unit. The first power supply can be a VCC power supply, and the switch tube can be an MOS tube.

In the process of carrying out display control on the LEDs in the LED display screen, the voltage on the row line where the LEDs are located can be discharged through the voltage control unit connected with the row line, so that the voltage on the row line where the LEDs are located is reduced to a target voltage, wherein the target voltage is greater than the threshold voltage of the LEDs.

It should be noted that after the preset time period is over, the parasitic capacitor on the row line where the LED is located can start discharging from the target voltage, so that the charge on the parasitic capacitor can be released more quickly.

Through this embodiment, for the LED display screen, the LED display screen includes the display array, this display array includes many rowlines and many row lines, be connected with LED at the intersection of many rowlines and many row lines, every rowline in many rowlines passes through the switch tube and is connected with the power, many rowlines are connected with voltage control unit, in the LED to the LED display screen carries out display control's in-process, in the predetermined duration before the switch tube of rowline closes, can discharge through voltage control unit to the voltage on the rowline that LED belongs to, make the voltage on the rowline drop to target voltage, wherein, above-mentioned target voltage is greater than LED's threshold voltage. In this way, because in the predetermined duration before the switch tube of rowline closes, make the voltage on the rowline that LED belongs to descend to the target voltage through voltage control unit, this target voltage is greater than LED's threshold voltage, and, this target voltage not only can guarantee that LED shines, but also can make parasitic capacitance on the rowline that LED belongs to begin to discharge from above-mentioned target voltage when the aforesaid is predetermine the duration and finishes, make the electric charge on the parasitic capacitance can be more quick by the release, make LED can not charged and light in order to produce the ghost phenomenon by the parasitic capacitance, the technical problem that the ghost phenomenon can appear when showing of LED display screen has been solved.

In an optional embodiment, the voltage control unit includes a plurality of voltage control subunits, each of the plurality of row lines is connected to one of the plurality of voltage control subunits, and the voltage on the row line is discharged by the voltage control unit within a preset time period before the switching tube of the row line is turned off, so that the voltage on the row line is decreased to the target voltage, including: and discharging the voltage on the first row line through a voltage control subunit within a preset time before a switching tube of the first row line is turned off, so that the voltage on the first row line is reduced to a target voltage, wherein the first row line is a row line connected with the voltage control subunit.

Alternatively, the voltage control unit may include a plurality of voltage control sub-units, and each of the plurality of row lines is connected to one of the plurality of voltage control sub-units. Each row line can be selected to be separately connected with one voltage control subunit, and at least two row lines can be connected with the same voltage control subunit. It is understood that the present embodiment does not limit the specific connection manner between the row line and the voltage control subunit.

For the first row line connected to the voltage control subunit, within a preset time period before the switching tube of the first row line is turned off, the voltage on the first row line may be discharged by the voltage control subunit, so that the voltage on the first row line is reduced to a target voltage.

This embodiment provides several specific ways of connection between the row lines and the voltage control units as follows:

as shown in fig. 5, the voltage control unit includes a plurality of voltage control subunits, each of the plurality of row lines (3 rows are shown in the figure) is connected to one of the voltage control subunits, a voltage control subunit may be connected to an output end of each row line, and one voltage control subunit connected to each row line independently controls the LEDs in the row to discharge charges on the row line of the LEDs in the row.

In an alternative embodiment, the discharging the voltage on the first row line by the voltage control subunit within a preset time period before the switching tubes of the first row line are turned off to decrease the voltage on the first row line to the target voltage includes: starting at a preset time point before a switching tube of the first column line is turned off, and sending a first charge discharging signal to a first charge discharging unit of the voltage control subunit under the condition that a first voltage detecting unit of the voltage control subunit monitors that the voltage of the first column line is greater than the target voltage; when the first charge draining unit of the voltage control subunit receives the first charge draining signal, draining the charge of the first column line so as to reduce the voltage of the first column line to the target voltage; wherein, the voltage control subunit includes: the first voltage detecting unit and the first charge draining unit are connected to the first column line, and the first voltage detecting unit and the first charge draining unit are connected to the first charge draining unit.

Alternatively, as shown in fig. 6, the voltage control subunit includes: the first voltage detection unit and the first charge leakage unit are respectively connected with the first column line, and the first voltage detection unit is connected with the first charge leakage unit.

The voltage on the first column line can be monitored through the first voltage detection unit of the voltage control subunit, starting at a preset time point before the switching tube of the first column line is turned off, if the voltage on the first column line is monitored to be greater than a target voltage through the first voltage detection unit of the voltage control subunit, a first charge discharging signal can be sent to the first charge discharging unit of the voltage control subunit, and when the first charge discharging unit receives the first charge discharging signal, the charge on the first column line can be discharged, so that the voltage on the first column line is reduced to the target voltage.

Through the implementation, the voltage on the first line can be monitored through the first voltage detection unit, as long as the voltage on the first line is monitored to be greater than the target voltage, the first charge leakage signal can be sent to the first charge leakage unit, so that the first charge leakage unit discharges the charges on the first line when receiving the first charge leakage signal, the voltage on the first line is reduced to the target voltage, the voltage on the first line is detected through the first voltage detection unit, and the voltage on the first line can be ensured to be reduced to the target voltage through the discharging mode of the first charge leakage unit, and the accuracy of controlling the voltage on the first line is improved.

In an alternative embodiment, the discharging the voltage on the first row line by the voltage control subunit within a preset time period before the switching tubes of the first row line are turned off to decrease the voltage on the first row line to the target voltage includes: starting at a preset time point before the switching tube of the first column line is turned off, and sending the first charge discharging signal to a control end of a first switching tube of the first charge discharging unit under the condition that the first voltage detecting unit monitors that the voltage of the first column line is greater than the target voltage; when the first switching tube of the first charge bleeding unit receives the first charge bleeding signal and the first switching tube is closed based on the first charge bleeding signal, the first switching tube and the first resistor bleed off the charge on the first column line to reduce the voltage on the first column line to the target voltage; the first charge bleeding unit includes the first switch tube and the first resistor, a first end of the first switch tube is connected to the first column line, a second end of the first switch tube is connected to the first end of the first resistor, a control end of the first switch tube is connected to the first voltage detecting unit, and a second end of the first resistor is connected to a second power supply.

Optionally, as shown in fig. 7, the first charge discharging unit includes a first switch tube and a first resistor, a first end of the first switch tube is connected to the first column line, a second end of the first switch tube is connected to a first end of the first resistor, a control end of the first switch tube is connected to the first voltage detecting unit, and a second end of the first resistor is connected to the second power supply. The first switch tube may be an MOS tube, and the second power supply may be a ground power supply.

When the first switch tube receives the first charge leakage signal, the first switch tube is opened, and the first resistor is in a discharge state; if the first switch tube does not receive the first charge leakage signal, the first switch tube is closed, the first resistor does not work, and the voltage on the first row line is not discharged.

For example, when the first switch tube is turned on, the first resistor starts to discharge, and when the first switch tube is turned off, the first resistor stops discharging.

Starting at a preset time point before the switch tube of the first column line is turned off, if the first voltage detection unit monitors that the voltage of the first column line is greater than the target voltage, the first switch tube of the first charge discharging unit is controlled to be turned on by a first charge discharging signal, and meanwhile, a first resistor connected with the first switch tube can start to discharge the charges on the first column line, so that the voltage on the first column line is reduced to the target voltage.

When a preset time period before the switch tube of the first column line is turned off is over (or before the preset time period is over), if the voltage detection unit monitors that the voltage of the first column line is equal to the target voltage, the voltage is controlled to turn off the first switch tube of the first charge discharging unit through the first charge discharging signal, and meanwhile, a first resistor connected with the first switch tube stops discharging the charges on the first column line.

It should be noted that, when the preset time period before the switching tube of the first column line is turned off is over, if the voltage on the first column line detected by the first voltage detecting unit is still greater than the target voltage, a control signal is required to control the first switching tube of the first charge draining unit to turn off, and at the same time, the first resistor connected to the first switching tube stops discharging the charges on the first column line.

As shown in fig. 8, the voltage control subunit may further use a voltage detection unit as the first voltage detection unit, and a MOS transistor, a register and a variable resistor R (such as the first resistor) as the first charge draining unit, so as to control the on/off of the first switch transistor by a control signal Ctr (corresponding to the first charge draining signal).

The voltage on the first line is detected by the first voltage detection unit, and when the detected voltage value is higher, the value of a variable resistor R (first resistor) can be set to be smaller, so that the discharge charge of the first resistor is larger, and the voltage on the first line can be ensured to be reduced to the target voltage, or the time length between the on and off of the Ctr time sequence can be set to be longer, so that the voltage on the first line can be ensured to be reduced to the target voltage.

The voltage on the first row line is detected by the voltage detection unit, when the detected voltage value is low, the value of a variable resistor R (first resistor) can be set to be large, so that the discharge charge of the first resistor is small, the voltage on the first row line can be ensured to be reduced to a target voltage and not to be reduced to a value lower than the target voltage, or the time length between the on and off of a Ctr time sequence can be set to be short, and the voltage on the first row line can be ensured to be reduced to the target voltage and not to be reduced to a value lower than the target voltage.

Through the embodiment, the voltage on the first row line is detected in real time through the first voltage detection unit, as long as the detected voltage is greater than the target voltage, the discharge is performed through the first resistor, as long as the detected voltage is equal to the target voltage, the discharge can be stopped through the first resistor, the voltage on the first row line can be reduced to the target voltage, the parasitic capacitor can start to discharge from the target voltage, the parasitic capacitor is prevented from discharging from a voltage value which is much greater than the target voltage, the discharge period is long, and by the adoption of the method, the discharge efficiency of the parasitic capacitor is improved.

In an optional embodiment, the voltage control unit includes a multiplexing unit, a second voltage detecting unit, and a second charge draining unit; the multiplexer is connected to the plurality of column lines, the second voltage detector and the second charge draining unit, the second voltage detector is connected to the second charge draining unit and a third power source, and the multiplexer further includes: determining a second row line by the multi-path selection unit; after a preset time point before a switching tube of the second column line is turned off, sending a second charge discharging signal to the second charge discharging unit under the condition that the second voltage detecting unit monitors that the voltage of the second column line is greater than the target voltage; and when the second charge draining unit receives the second charge draining signal, draining the charge on the second row line so as to reduce the voltage of the second row line to the target voltage.

Optionally, as shown in fig. 9, the voltage control unit includes a multiplexing unit, a second voltage detecting unit, and a second charge draining unit; the multi-channel selection unit is respectively connected with the plurality of column lines, the second voltage detection unit and the second charge draining unit, and the second voltage detection unit is connected with the second charge draining unit and a third power supply end.

After the switching tube of the upper first row line is closed, a second row line of the plurality of row lines can be determined through the multi-path selection unit so as to display and control the LED on the second row line, after a preset time point before the switching tube of the second row line is closed begins, the voltage on the second row line can be monitored through the second voltage detection unit, and if the voltage on the second row line is monitored to be greater than a target voltage, a second charge discharge signal can be sent to the second charge discharge unit. When the second charge draining unit receives the second charge draining signal, the second charge draining signal can drain the charge on the second row line, so that the voltage on the second row line is reduced to the target voltage.

With this embodiment, after the draining of the charge on the first row line is completed, and the display control of the LEDs on the first row line is completed, a second row line to be subjected to display control next among the plurality of row lines may be determined by the multiplexing unit, after the preset time point before the switch tube of the second column line is turned off, the voltage on the second column line is reduced to the target voltage through the second voltage detecting unit and the second charge draining unit, since the target voltage is greater than the threshold voltage of the LED, the parasitic capacitance on the second row line may be discharged from the target voltage at the end of the predetermined time period, the electric charges on the parasitic capacitors can be released more quickly, so that the LEDs on the second row line cannot be charged by the parasitic capacitors and are lightened to generate a ghost phenomenon, and the technical problem that the ghost phenomenon can occur when the LED display screen displays is solved.

In an alternative embodiment, the bleeding charge from the second row line to lower the voltage of the second row line to the target voltage includes: when the second voltage detecting unit detects that the voltage of the second column line is greater than the target voltage, the second voltage detecting unit sends the second charge discharging signal to the control end of the second switch tube of the second charge discharging unit; when the second switch tube of the second charge draining unit receives the second charge draining signal and the second switch tube is closed based on the second charge draining signal, the charge on the second row line is drained through the second switch tube and a second resistor, and the voltage on the second row line is reduced to the target voltage; the second charge discharging unit includes the second switch tube and the second resistor, a first end of the second switch tube is connected to the second column line, a second end of the second switch tube is connected to a first end of the second resistor, a control end of the second switch tube is connected to the second voltage detecting unit, and a second end of the second resistor is connected to a second power supply.

Optionally, as shown in fig. 10, the second charge discharging unit includes the second switch tube and the second resistor, a first end of the second switch tube is connected to the second column line, a second end of the second switch tube is connected to a first end of the second resistor, a control end of the second switch tube is connected to the second voltage detecting unit, and a second end of the second resistor is connected to a second power supply. The second switch tube may be an MOS tube, and the second power supply may be a ground power supply.

When the second switch tube receives the second charge leakage signal, the second switch tube is opened, and the second resistor is in a discharging state; if the second switch tube does not receive the second charge leakage signal, the second switch tube is closed, the second resistor does not work, and the voltage on the second row line is not discharged.

For example, when the second switch tube is turned on, the second resistor starts to discharge, and when the second switch tube is turned off, the second resistor stops discharging.

Starting at a preset time point before the switch tube of the second row line is turned off, if the second voltage detection unit monitors that the voltage on the second row line is greater than the target voltage, the second switch tube of the second charge discharging unit is controlled to be turned on through a second charge discharging signal, and meanwhile, a second resistor connected with the second switch tube can start to discharge the charge on the second row line, so that the voltage on the second row line is reduced to the target voltage.

When a preset time period before the switching tube of the second column line is turned off is over (or before the preset time period is over), if the voltage detection unit monitors that the voltage on the second column line is equal to the target voltage, the voltage is controlled to turn off the second switching tube of the second charge discharging unit through the second charge discharging signal, and meanwhile, a second resistor connected with the second switching tube stops discharging the charges on the second column line.

It should be noted that, when the preset time period before the switching tube of the second column line is turned off is over, if the voltage on the second column line detected by the second voltage detecting unit is still greater than the target voltage, the second switching tube of the second charge draining unit needs to be controlled to be turned off by a control signal, and at the same time, the second resistor connected to the second switching tube stops discharging the charge on the second column line.

As shown in fig. 8, the voltage detecting unit may be used as the second voltage detecting unit, the MOS transistor, the register and the variable resistor R (the second resistor) constitute a second charge draining unit, and the second switch transistor may be controlled to be turned on or off by a control signal Ctr (corresponding to the second charge draining signal).

The voltage on the second row line is detected by the second voltage detection unit, when the detected voltage value is higher, the value of the variable resistor R (second resistor) can be set to be smaller, so that the discharge charge of the second resistor is larger, the voltage on the second row line can be ensured to be reduced to the target voltage, or the time length between the turn-on and the turn-off of the Ctr time sequence can be set to be longer, and the voltage on the second row line can be ensured to be reduced to the target voltage.

The voltage on the second row line is detected by the voltage detection unit, when the detected voltage value is low, the value of a variable resistor R (a second resistor) can be set to be large, so that the discharge charge of the second resistor is small, the voltage on the second row line can be ensured to be reduced to a target voltage and not to be reduced to a value lower than the target voltage, or the time length between the on and off of a Ctr time sequence can be set to be short, and the voltage on the second row line can be ensured to be reduced to the target voltage and not to be reduced to a value lower than the target voltage.

Through this embodiment, through the real-time detection of second voltage detecting element voltage on to the second rowline, as long as the voltage that detects is greater than target voltage, just discharge through the second resistance, as long as the voltage that detects equals target voltage, the second resistance just can stop discharging, guaranteed to descend the voltage on the second rowline to target voltage, and then make parasitic capacitance can begin to discharge from target voltage, avoided parasitic capacitance to begin to discharge from a voltage value that is greater than a lot of target voltage, the discharge cycle is long, through this kind of mode, parasitic capacitance's discharge efficiency has been improved.

In an alternative embodiment, discharging the voltage on the row line by the voltage control unit within a preset time period before the switching tube of the row line is turned off to lower the voltage on the row line to a target voltage includes: and at a first moment before the preset time length is finished, controlling the voltage on the row line where the ith row of LEDs is located to start to fall through the voltage control unit, and controlling the voltage on the row line where the ith row of LEDs is located to be the target voltage through the voltage control unit when the preset time length is finished, wherein the row line where the ith row of LEDs is located is one of the plurality of row lines.

Optionally, at a first time before the preset time period ends, the first time may be a start time of the preset time period, or may be a time between a start time and an end time of the preset time period, starting from the first time, the voltage control unit controls the voltage on the row line where the ith row of LEDs is located to start to decrease, and at the end of the preset time period, the voltage control unit controls the voltage on the row line where the ith row of LEDs is located to be the target voltage.

In an optional embodiment, the controlling, by the voltage control unit, the voltage on the row line where the ith row of LEDs is located to start to decrease at the first time before the preset time period ends, and controlling, by the voltage control unit, the voltage on the row line where the ith row of LEDs is located to be the target voltage at the time when the preset time period ends includes: and at the first moment, controlling the voltage on the row line where the ith row of LEDs is located to be reduced to the target voltage through the voltage control unit, and maintaining the voltage on the row line where the ith row of LEDs is located at the target voltage through the voltage control unit after the first moment until the preset time length is finished.

Optionally, at the first time, the voltage on the row line where the ith row of LEDs is located is directly decreased to the target voltage by the voltage control unit, and after the first time and until a preset time period ends, the voltage on the row line where the ith row of LEDs is located is maintained to the target voltage.

As shown in waveform 3 in fig. 11, the waveform of the voltage on the row line where the ith row of LEDs is located in the above process changes.

Through the embodiment, the voltage on the row line where the ith row of LEDs is located is reduced to the target voltage through the mode, then the parasitic capacitance on the row line where the ith row of LEDs is located can be discharged from the target voltage, and the discharging efficiency of the parasitic capacitance is improved.

Optionally, in this embodiment, the controlling, by the voltage control unit, the voltage on the row line where the ith row of LEDs is located to start to decrease at the first time before the preset time period ends, and controlling, by the voltage control unit, the voltage on the row line where the ith row of LEDs is located to be the target voltage at the time when the preset time period ends includes: at the first time, controlling, by the voltage control unit, the voltage on the row line where the ith row of LEDs is located to decrease to a first voltage, and maintaining, by the voltage control unit, the voltage on the row line where the ith row of LEDs is located at the first voltage at a second time after the first time and before the preset time period ends, where the first voltage is greater than the target voltage; and at the second moment, controlling the voltage on the row line where the ith row of LEDs is located to be reduced to the target voltage through the voltage control unit, and maintaining the voltage on the row line where the ith row of LEDs is located at the target voltage through the voltage control unit after the second moment until the preset time length is finished.

Optionally, at the first time, the voltage on the row line where the ith row of LEDs is located is decreased to a first voltage by the voltage control unit, and after the first time and until a second time before the preset time period ends, the voltage on the row line where the ith row of LEDs is located is maintained at the first voltage by the voltage control unit, where the first voltage is greater than the target voltage.

And then, from a second moment, the voltage on the row line where the ith row of LEDs is located is reduced from the first voltage to a target voltage through the voltage control unit, and after the second moment and until a preset time length is finished, the voltage on the row line where the ith row of LEDs is located is maintained at the target voltage through the voltage control unit.

As shown by the waveform 2 in fig. 11, the waveform of the voltage on the row line where the ith row of LEDs is located in the above process changes.

Optionally, in this embodiment, the controlling, by the voltage control unit, the voltage on the row line where the ith row of LEDs is located to start to decrease at the first time before the preset time period ends, and controlling, by the voltage control unit, the voltage on the row line where the ith row of LEDs is located to be the target voltage at the time when the preset time period ends includes: and controlling the voltage on the row line where the ith row of LEDs is located to continuously decrease through the voltage control unit from the first time to the end of the preset time, wherein the voltage on the row line where the ith row of LEDs is located is the target voltage at the end of the preset time.

And when the preset time length is known to be finished at the first moment, continuously reducing the voltage on the row line where the ith row of LEDs is located through the voltage control unit until the preset time length is finished, so that the voltage on the row line where the ith row of LEDs is located is reduced to the target voltage.

As shown in waveform 1 in fig. 11, the waveform of the voltage on the row line where the ith row of LEDs is located in the above process changes.

Optionally, in this embodiment, as an optional implementation manner, there is further provided an LED display screen, including:

the display array comprises a plurality of row lines and a plurality of row lines, LEDs are connected at the intersections of the row lines and the row lines, each row line in the row lines is connected with a first power supply through a switch tube, and the row lines are connected with a voltage control unit;

the voltage control unit is used for controlling the voltage on the row line to be reduced to a target voltage within a preset time before the switching tube of the row line is closed, and the target voltage is greater than the threshold voltage of the LED.

Optionally, the display arrays corresponding to the LED display screens may be connected as shown in fig. 4 and 5.

In an alternative embodiment, the voltage control unit includes a plurality of voltage control sub-units, and each of the plurality of row lines is connected to one of the plurality of voltage control sub-units; the voltage control subunit is configured to control, within a preset time period before a switching tube of a first column line is turned off, a voltage on the first column line to be reduced to the target voltage, where the first column line is a column line connected to the voltage control subunit.

In an alternative embodiment, the voltage control subunit includes: a first voltage detection unit and a first charge draining unit, both of which are connected to the first column line, the first voltage detection unit being connected to the first charge draining unit; the first voltage detection unit is configured to send a first charge draining signal to the first charge draining unit when it is monitored that the voltage on the first column line is greater than the target voltage, starting at a preset time point before the switching tube of the first column line is turned off; the first charge draining unit is configured to drain charges on the first column line to reduce a voltage of the first column line to the target voltage when receiving the first charge draining signal.

In an alternative embodiment, the first charge draining unit includes a first switch tube and a first resistor, a first end of the first switch tube is connected to the first column line, a second end of the first switch tube is connected to a first end of the first resistor, a control end of the first switch tube is connected to the first voltage detecting unit, and a second end of the first resistor is connected to a second power supply; the first voltage detection unit is configured to send the first charge bleeding signal to the control end of the first switch tube when it is monitored that the voltage on the first column line is greater than the target voltage, starting at a preset time point before the switch tube of the first column line is turned off; the first switch tube is closed based on the first charge leakage signal, so that the charge on the first row line is leaked through the first switch tube and the first resistor, and the voltage on the first row line is reduced to the target voltage.

In an optional embodiment, the voltage control unit includes a multiplexing unit, a second voltage detecting unit, and a second charge draining unit; the multi-channel selection unit is respectively connected with the plurality of column lines, the second voltage detection unit and the second charge draining unit, and the second voltage detection unit is connected with the second charge draining unit and a third power supply end; the multi-path selection unit is used for determining a second row line; the second voltage detection unit is configured to send a second charge draining signal to the second charge draining unit when it is monitored that the voltage on the second column line is greater than the target voltage, starting at a preset time point before the switching tube of the second column line is turned off; the second charge draining unit is used for draining the charges on the second row line under the condition of receiving the second charge draining signal so as to reduce the voltage of the second row line to the target voltage.

In an alternative embodiment, the second charge draining unit includes a second switch tube and a second resistor, a first end of the second switch tube is connected to the second column line, a second end of the second switch tube is connected to a first end of the second resistor, a control end of the second switch tube is connected to the second voltage detecting unit, and a second end of the second resistor is connected to a second power supply; the second voltage detection unit is configured to send the second charge bleeding signal to the control end of the second switch tube when it is monitored that the voltage on the second column line is greater than the target voltage, starting at a preset time point before the switch tube of the second column line is turned off; the second switch tube is closed based on the second charge discharging signal, so that the charge on the second row line is discharged through the second switch tube and the second resistor, and the voltage on the second row line is reduced to the target voltage.

The following describes a display control method of the LED display screen with reference to an alternative example.

It should be noted that, the display array of the LED display screen may refer to the circuits shown in fig. 4 and 5. The circuit of the voltage control subunit may refer to the circuit shown in fig. 8.

By the circuits shown in fig. 4, 5, and 8 described above:

1. when row (n) column is opened, the voltage detecting unit detects that the voltage on the column line is VCC, the Ctr signal is at high voltage, and the MOS tube in the voltage control unit is in a closed state. When the column line is a first column line, the voltage detection unit is a first voltage detection unit, and the MOS tube is a first switch tube; when the column line is the second column line, the voltage detecting unit is the second voltage detecting unit, and the MOS transistor is the second switch transistor.

2. During the time T1 (the predetermined time period) immediately before row (n) column opening, Ctr signal will be at low voltage, and the voltage detecting unit detects that the voltage on the column line is V ', and V' > V2 (target voltage); at this time, the MOS transistor in the voltage control unit is turned on, the charges on the row line are discharged through the MOS transistor and the resistor R, and the discharge slope (speed) is determined by the size of the resistor R and is inversely proportional to the size of the resistor R.

3. When the voltage detecting unit detects that the voltage on the column line is the target voltage V2, the Ctr signal is pulled up immediately, the MOS transistor is turned off, the discharge is finished, and after the column signal is turned off, the voltage on the column line is V2, so that the parasitic capacitance on the column line can be reduced from V2.

As shown in fig. 12, during time T1, the voltage on the row line is decreased from V1 to V2 by the voltage control unit, and the amount of the change is shown in the figure, so that the parasitic capacitance on the row line does not decrease from V1, and the charge on the parasitic capacitance can be discharged only by decreasing the remaining amount shown in fig. 12. The discharge speed of the parasitic capacitance is greatly improved.

4. If the voltage on the row line still does not reach the target voltage V2 at the end of the row signal row (n), the Ctr signal still needs to be pulled up synchronously, at this time, the MOS transistor of the voltage control unit is in a closed state, the voltage on the row line is an intermediate value from V1 to V2, and the voltage difference between the intermediate value and the target value to which the parasitic capacitance is to be decreased is from V1 to the target value, to a voltage value smaller than V1 to the target value.

It should be noted that the resistor R is a variable resistor, and different resistance values can be obtained according to different application scenarios by changing the setting of the register.

If the discharge voltage value is lower or higher, the discharge voltage value can be realized not only by changing the time sequence of the Ctr, but also by changing the value of the resistor. For example, when the discharge voltage value is low, the timing of Ctr may be set to be short, or the resistance value may be set to be large. When the discharge voltage value is high, the timing of Ctr may be set to be long or the resistance value may be set to be small. It is understood that the above is only an example, and the present embodiment is not limited thereto.

It should be noted that, in the conventional manner, after Row (n) is turned off, because of the existence of the parasitic capacitance, the charge on the Row line cannot be released quickly, and when Row (n +1) is turned on, because the Row line is also pulled low, there is a risk that the LED on Row (n) may be triggered by mistake and then lighted.

In this embodiment, the voltage detection circuit detects the voltage on the row line, and in a set timing, when the voltage on the row line is greater than a set target voltage, the discharge circuit corresponding to the voltage control unit discharges to reduce the voltage on the row line to the set target voltage, so as to eliminate the effect caused by the parasitic capacitance. By adopting the mode, the voltage can be reduced to a certain proper level (such as a target voltage) at the last stage of Row opening, so that the Row line starts to discharge in advance, the charge of the Row is basically discharged to the target value when the next Row is opened, the LED of the previous Row cannot be triggered, and the ghost phenomenon is avoided.

According to another aspect of the embodiments of the present invention, there is provided a display control device of an LED display screen, where the LED display screen includes a display array, the display array includes a plurality of row lines and a plurality of column lines, where the plurality of row lines and the plurality of column lines intersect, and each of the plurality of row lines is connected to a first power supply through a switching tube, and the plurality of row lines are connected to a voltage control unit, as shown in fig. 13, the device includes:

the first processing unit 1302 is configured to discharge the voltage on the row line through the voltage control unit within a preset time period before the switching tubes of the row line are turned off, so that the voltage on the row line is decreased to a target voltage, where the target voltage is greater than the threshold voltage of the LED.

Through this embodiment, for the LED display screen, the LED display screen includes the display array, this display array includes many rowlines and many row lines, be connected with LED at the intersection of many rowlines and many row lines, every rowline in many rowlines passes through the switch tube and is connected with first power, many rowlines are connected with voltage control unit, in the LED to the LED display screen carries out display control's in-process, in the predetermined duration before the switch tube of rowline closes, can discharge through voltage control unit to the voltage on the rowline that LED belongs to, make the voltage on the rowline drop to target voltage, wherein, above-mentioned target voltage is greater than LED's threshold voltage. In this way, because in the predetermined duration before the switch tube of rowline closes, make the voltage on the rowline that LED belongs to descend to the target voltage through voltage control unit, this target voltage is greater than LED's threshold voltage, and, this target voltage not only can guarantee that LED shines, but also can make parasitic capacitance on the rowline that LED belongs to begin to discharge from above-mentioned target voltage when the aforesaid is predetermine the duration and finishes, make the electric charge on the parasitic capacitance can be more quick by the release, make LED can not charged and light in order to produce the ghost phenomenon by the parasitic capacitance, the technical problem that the ghost phenomenon can appear when showing of LED display screen has been solved.

As an optional technical solution, the first processing unit includes: the first processing module is configured to discharge a voltage on a first row line through a voltage control subunit within a preset time period before a switching tube of the first row line is turned off, so that the voltage on the first row line is reduced to a target voltage, where the first row line is a row line connected to the voltage control subunit, the voltage control unit includes a plurality of voltage control subunits, and each of the plurality of row lines is connected to one of the plurality of voltage control subunits.

As an optional technical solution, the first processing module is further configured to send a first charge draining signal to a first charge draining unit of the voltage control subunit when a first voltage detecting unit of the voltage control subunit monitors that a voltage on the first column line is greater than the target voltage, starting at a preset time point before a switching tube of the first column line is turned off; when the first charge draining unit of the voltage control subunit receives the first charge draining signal, draining the charge of the first column line so as to reduce the voltage of the first column line to the target voltage; wherein, the voltage control subunit includes: the first voltage detecting unit and the first charge draining unit are connected to the first column line, and the first voltage detecting unit and the first charge draining unit are connected to the first charge draining unit.

As an optional technical solution, the first processing module is further configured to send the first charge draining signal to a control end of a first switch tube of the first charge draining unit when the first voltage detecting unit detects that a voltage of the first column line is greater than the target voltage, starting at a preset time point before a switch tube of the first column line is turned off; when the first switching tube of the first charge bleeding unit receives the first charge bleeding signal and the first switching tube is closed based on the first charge bleeding signal, the first switching tube and the first resistor bleed off the charge on the first column line to reduce the voltage on the first column line to the target voltage; the first charge bleeding unit includes the first switch tube and the first resistor, a first end of the first switch tube is connected to the first column line, a second end of the first switch tube is connected to the first end of the first resistor, a control end of the first switch tube is connected to the first voltage detecting unit, and a second end of the first resistor is connected to a second power supply.

As an optional technical solution, the voltage control unit includes a multiplexing unit, a second voltage detecting unit and a second charge draining unit; the multiplexer is connected to the plurality of column lines, the second voltage detector and the second charge draining unit, the second voltage detector is connected to the second charge draining unit and a third power source, and the apparatus further comprises: a determining unit for determining a second row line by the multiplexing unit; a second processing unit, configured to send a second charge draining signal to the second charge draining unit after a preset time point before a switching tube of the second column line is turned off begins and when the second voltage detecting unit detects that the voltage on the second column line is greater than the target voltage; a third processing unit, configured to discharge the charge on the second row line when the second charge discharging unit receives the second charge discharging signal, so that the voltage of the second row line is reduced to the target voltage.

As an optional technical solution, the third processing unit includes: a second processing module, configured to send the second charge draining signal to a control end of a second switching tube of the second charge draining unit when the second voltage detecting unit detects that the voltage on the second column line is greater than the target voltage, starting at a preset time point before the switching tube of the second column line is turned off; a third processing module, configured to, when the second switching tube of the second charge draining unit receives the second charge draining signal and the second switching tube is closed based on the second charge draining signal, drain the charge on the second row line through the second switching tube and a second resistor, so as to reduce the voltage on the second row line to the target voltage; the second charge discharging unit includes the second switch tube and the second resistor, a first end of the second switch tube is connected to the second column line, a second end of the second switch tube is connected to a first end of the second resistor, a control end of the second switch tube is connected to the second voltage detecting unit, and a second end of the second resistor is connected to a second power supply.

Embodiments of the present invention further provide a computer-readable storage medium, in which a computer program is stored, where the computer program is configured to, when executed, perform the steps in the above-mentioned display control method embodiments of the LED display screen.

Alternatively, in the present embodiment, the storage medium may be configured to store a computer program for executing the steps of:

the LED display screen comprises a display array, the display array comprises a plurality of row lines and a plurality of row lines, LEDs are connected at the intersections of the row lines and the row lines, each row line of the row lines is connected with a first power supply through a switch tube, and the row lines are connected with a voltage control unit;

and S1, discharging the voltage on the row line through the voltage control unit within a preset time before the switch tube of the row line is closed, so that the voltage on the row line is reduced to a target voltage, wherein the target voltage is greater than the threshold voltage of the LED.

In an exemplary embodiment, the computer-readable storage medium may include, but is not limited to: various media capable of storing computer programs, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.

Embodiments of the present invention further provide an electronic device, including a memory and a processor, where the memory stores a computer program, and the processor is configured to execute the computer program to perform the steps in the above embodiments of the display control method for an LED display screen.

Optionally, in this embodiment, the processor may be configured to execute the following steps by a computer program:

In an exemplary embodiment, the electronic apparatus may further include a transmission device and an input/output device, wherein the transmission device is connected to the processor, and the input/output device is connected to the processor.

For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary embodiments, and details of this embodiment are not repeated herein.

It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.

Claims

1. A display control method of an LED display screen is characterized in that the LED display screen comprises a display array, the display array comprises a plurality of row lines and a plurality of column lines, LEDs are connected at the intersections of the row lines and the column lines, each row line of the row lines is connected with a first power supply through a switch tube, and the row lines are connected with a voltage control unit, and the method comprises the following steps:

and discharging the voltage on the row line through the voltage control unit within a preset time before the switching tube of the row line is turned off, so that the voltage on the row line is reduced to a target voltage, wherein the target voltage is greater than the threshold voltage of the LED.

2. The method of claim 1, wherein the voltage control unit comprises a plurality of voltage control sub-units, each of the plurality of row lines is connected to one of the plurality of voltage control sub-units, and discharging the voltage on the row line by the voltage control unit within a preset time period before a switching transistor of the row line is turned off to lower the voltage on the row line to a target voltage comprises:

discharging the voltage on the first row line through a voltage control subunit within a preset time before a switching tube of the first row line is turned off, so that the voltage on the first row line is reduced to a target voltage, wherein the first row line is a row line connected with the voltage control subunit.

3. The method of claim 2, wherein discharging the voltage on the first row line to a target voltage by a voltage control subunit within a preset time period before the switching tubes of the first row line are turned off comprises:

starting at a preset time point before a switching tube of the first column line is turned off, and sending a first charge discharging signal to a first charge discharging unit of the voltage control subunit under the condition that a first voltage detecting unit of the voltage control subunit monitors that the voltage of the first column line is greater than the target voltage;

when the first charge bleeding unit of the voltage control subunit receives the first charge bleeding signal, bleeding the charge of the first row line to reduce the voltage of the first row line to the target voltage;

wherein the voltage control subunit includes: the first voltage detection unit and the first charge leakage unit are both connected with the first column line, and the first voltage detection unit and the first charge leakage unit are connected.

4. The method of claim 3, wherein discharging the voltage on the first row line to a target voltage by a voltage control subunit within a preset time period before the switching tubes of the first row line are turned off comprises:

starting at a preset time point before the switching tube of the first column line is turned off, and sending the first charge discharging signal to a control end of a first switching tube of the first charge discharging unit under the condition that the first voltage detecting unit monitors that the voltage of the first column line is greater than the target voltage;

when the first switch tube of the first charge leakage unit receives the first charge leakage signal and the first switch tube is closed based on the first charge leakage signal, so that the charge on the first row line is leaked through the first switch tube and a first resistor, and the voltage on the first row line is reduced to the target voltage;

the first charge leakage unit comprises the first switch tube and the first resistor, a first end of the first switch tube is connected with the first column line, a second end of the first switch tube is connected with a first end of the first resistor, a control end of the first switch tube is connected with the first voltage detection unit, and a second end of the first resistor is connected with a second power supply.

5. The method of claim 1, wherein the voltage control unit comprises a multiplexing unit, a second voltage detecting unit and a second charge draining unit; the multi-channel selection unit is respectively connected with the plurality of row lines, the second voltage detection unit and the second charge draining unit, the second voltage detection unit is connected with the second charge draining unit and a third power supply end, and the multi-channel selection unit further comprises:

determining a second row line by the multiplexing unit;

after a preset time point before a switching tube of the second row line is turned off begins, sending a second charge discharging signal to the second charge discharging unit under the condition that the second voltage detecting unit monitors that the voltage of the second row line is greater than the target voltage;

and when the second charge bleeding unit receives the second charge bleeding signal, bleeding the charge on the second row line so as to reduce the voltage of the second row line to the target voltage.

6. The method of claim 5, wherein the bleeding the charge on the second row line to bring the voltage of the second row line down to the target voltage comprises:

when the second voltage detection unit monitors that the voltage on the second column line is greater than the target voltage, the second voltage detection unit sends a second charge discharging signal to a control end of a second switch tube of the second charge discharging unit;

when the second switch tube of the second charge leakage unit receives the second charge leakage signal and the second switch tube is closed based on the second charge leakage signal, the charge on the second row line is leaked through the second switch tube and a second resistor, and the voltage on the second row line is reduced to the target voltage;

the second charge discharging unit comprises a second switch tube and a second resistor, a first end of the second switch tube is connected with the second row line, a second end of the second switch tube is connected with a first end of the second resistor, a control end of the second switch tube is connected with the second voltage detecting unit, and a second end of the second resistor is connected with a second power supply.

7. An LED display screen, comprising:

the display array comprises a plurality of row lines and a plurality of column lines, LEDs are connected at the intersections of the row lines and the column lines, each row line in the row lines is connected with a first power supply through a switch tube, and the row lines are connected with a voltage control unit;

the voltage control unit is used for controlling the voltage on the row line to be reduced to a target voltage within a preset time before the switch tube of the row line is closed, and the target voltage is greater than the threshold voltage of the LED.

8. The LED display of claim 7, wherein the voltage control unit includes a plurality of voltage control sub-units, each of the plurality of row lines connected to one of the plurality of voltage control sub-units;

the voltage control subunit is configured to control, within a preset time period before a switching tube of a first row line is turned off, a voltage on the first row line to be reduced to the target voltage, where the first row line is a row line connected to the voltage control subunit.

9. The LED display screen as recited in claim 8,

the voltage control subunit includes: the first voltage detection unit and the first charge leakage unit are both connected with the first column line, and the first voltage detection unit is connected with the first charge leakage unit;

the first voltage detection unit is used for sending a first charge discharging signal to the first charge discharging unit when the voltage on the first row line is monitored to be greater than the target voltage from a preset time point before the switching tube of the first row line is turned off;

the first charge draining unit is used for draining the charge on the first row line under the condition of receiving the first charge draining signal so as to enable the voltage of the first row line to be reduced to the target voltage.

10. The LED display panel as recited in claim 9, wherein the first charge draining unit comprises a first switch tube and a first resistor, a first end of the first switch tube is connected to the first column line, a second end of the first switch tube is connected to a first end of the first resistor, a control end of the first switch tube is connected to the first voltage detecting unit, and a second end of the first resistor is connected to a second power supply;

the first voltage detection unit is configured to send the first charge bleeding signal to the control end of the first switching tube when it is monitored that the voltage on the first column line is greater than the target voltage, starting at a preset time point before the switching tube of the first column line is turned off;

the first switch tube is closed based on the first charge discharging signal, so that the charge on the first row line is discharged through the first switch tube and the first resistor, and the voltage on the first row line is reduced to the target voltage.

11. The LED display screen of claim 7, wherein the voltage control unit includes a multiplexing unit, a second voltage detecting unit, and a second charge draining unit;

the multi-path selection unit is respectively connected with the plurality of row lines, the second voltage detection unit and the second charge leakage unit, and the second voltage detection unit is connected with the second charge leakage unit and a third power supply end;

the multi-path selection unit is used for determining a second row line;

the second voltage detection unit is configured to send a second charge draining signal to the second charge draining unit when it is monitored that the voltage on the second column line is greater than the target voltage, starting at a preset time point before the switching tube of the second column line is turned off;

the second charge draining unit is used for draining the charge on the second row line under the condition of receiving the second charge draining signal so as to enable the voltage of the second row line to be reduced to the target voltage.

12. The LED display panel of claim 11, wherein the second charge draining unit comprises a second switch tube and a second resistor, a first end of the second switch tube is connected to the second column line, a second end of the second switch tube is connected to a first end of the second resistor, a control end of the second switch tube is connected to the second voltage detecting unit, and a second end of the second resistor is connected to a second power supply;

the second voltage detection unit is configured to send the second charge bleeding signal to the control end of the second switching tube when it is monitored that the voltage on the second column line is greater than the target voltage, starting at a preset time point before the switching tube of the second column line is turned off;

the second switch tube is closed based on the second charge draining signal, so that the charge on the second row line is drained through the second switch tube and the second resistor, and the voltage on the second row line is reduced to the target voltage.