CN112967661A - Display control method and device of LED display screen, storage medium and electronic equipment - Google Patents

Display control method and device of LED display screen, storage medium and electronic equipment Download PDF

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CN112967661A
CN112967661A CN202011092881.6A CN202011092881A CN112967661A CN 112967661 A CN112967661 A CN 112967661A CN 202011092881 A CN202011092881 A CN 202011092881A CN 112967661 A CN112967661 A CN 112967661A
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voltage
row
led lamps
led
target voltage
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CN112967661B (en
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周满城
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Chongqing Kangjia Photoelectric Technology Research Institute Co Ltd
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Chongqing Kangjia Photoelectric Technology Research Institute Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0266—Reduction of sub-frame artefacts

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  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

The invention relates to a display control method and a display control device of an LED display screen, a storage medium and electronic equipment, wherein the LED display screen comprises a plurality of rows of LED lamps, and the method comprises the following steps: within a preset time before display control of an ith row of LED lamps in an LED display screen is finished, controlling the voltage on a row line where the ith row of LED lamps is located to be reduced to a first target voltage through a signal generator, wherein the first target voltage is greater than the threshold voltage of the LEDs, and i is a positive integer; after the display control of the ith row of LED lamps is finished and before the display control of the (i +1) th row of LED lamps is carried out, the parasitic capacitance on the row line where the ith row of LED lamps is located discharges from the first target voltage to the second target voltage, wherein the second target voltage is smaller than the threshold voltage of the LEDs. 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 and device of LED display screen, storage medium and electronic equipment
Technical Field
The invention relates to the technical field of LEDs, in particular to a display control method and device of an LED display screen, a storage medium and electronic equipment.
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 every time, the voltage on the row line cannot be released quickly, and when the next row is opened, the LED lamp 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 and device for an LED display panel, a storage medium and an electronic device, which aim 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, there is provided a display control method for an LED display screen, where the LED display screen includes a plurality of rows of LED lamps, the method including: controlling the voltage on a row line where an ith row of LED lamps in an LED display screen is located to be reduced to a first target voltage through a signal generator within a preset time before display control on the ith row of LED lamps in the LED display screen is finished, wherein the first target voltage is greater than the threshold voltage of the LEDs, and i is a positive integer; and after the display control of the ith row of LED lamps is finished and before the display control of the (i +1) th row of LED lamps is carried out, discharging the parasitic capacitance on the row line where the ith row of LED lamps is positioned from the first target voltage to a second target voltage, wherein the second target voltage is less than the threshold voltage of the LEDs.
According to the invention, for the LED display screen, the LED display screen comprises a plurality of lines of LED lamps, in the process of carrying out display control on the LED lamps of the LED display screen, when the I-th line of the LED display screen is scanned, the display control is carried out on the I-th line of the LED lamps, the voltage on the row line where the I-th line of the LED lamps is located is controlled to be reduced to a first target voltage through a signal generator within a preset time length before the display control on the I-th line of the LED lamps in the LED display screen is finished, wherein the first target voltage is greater than the threshold voltage of the LED, after the display control on the I-th line of the LED lamps is finished, before the display control is carried out on the (i +1) th line of the LED lamps, the parasitic capacitor on the row line where the I-th line of the LED lamps is located is discharged from the first target voltage and is reduced to a second target voltage, and the second target voltage is smaller than the threshold voltage of the LED. Through the mode, when the preset time length is finished, the voltage on the row line where the ith row of LED lamps is located is reduced to the first target voltage through the signal generator, the first target voltage is larger than the threshold voltage of the ith row of LED lamps, the parasitic capacitor on the row line where the ith row of LED lamps is located starts to discharge from the first target voltage when the preset time length is finished and discharges to the second target voltage, the second target voltage is smaller than the threshold voltage of the LED lamps, the charge on the parasitic capacitor can start to discharge from the first target voltage, the charge on the parasitic capacitor can be released more quickly, the LED lamps cannot be charged by the parasitic capacitor and are lightened to generate a ghost phenomenon, and the technical problem that the ghost phenomenon can occur when an LED display screen displays images is solved.
Optionally, the controlling, by the signal generator, the voltage of the row line where the ith row of LED lamps is located to be reduced to the first target voltage within a preset time period before the display control of the ith row of LED lamps in the LED display screen is finished includes: and at a first moment before the preset time length is finished, sending a voltage signal to a column line where the ith row of LED lamps is located through the signal generator, wherein the voltage signal is used for reducing the voltage of the column line where the ith row of LED lamps is located to the first target voltage before the display control of the ith row of LED lamps is finished.
Optionally, the sending a voltage signal to the row line where the ith row of LED lamps is located by the signal generator includes: and at a first moment before the preset time length is ended, a voltage signal with the voltage value being the first target voltage is sent to a row line where the ith row of LED lamps is located through the signal generator, and the voltage signal is kept at the moment when the ith row of LED lamps is controlled to be displayed, so that the voltage of the row line where the ith row of LED lamps is located is reduced to the first target voltage.
Optionally, the sending a voltage signal to the row line where the ith row of LED lamps is located by the signal generator includes: and during the period from the first time to a second time, giving a descending voltage signal to the row line where the ith row of LED lamps is located through the signal generator, wherein the second time is the time before the display control of the ith row of LED lamps is finished, and the voltage value of the descending voltage signal is the first target voltage at the second time.
Optionally, the decreasing voltage signal is a linearly decreasing voltage signal.
Optionally, the decreasing voltage signal is a non-linear decreasing voltage signal.
Optionally, the decreasing voltage signal is a stepped decreasing voltage signal.
According to another aspect of the embodiments of the present invention, there is also provided a display control apparatus for an LED display screen, including: the control unit is used for controlling the voltage on a row line where an ith row of LED lamps in the LED display screen are located to be reduced to a target voltage through the signal generator within a preset time length for carrying out display control on the ith row of LED lamps, wherein the target voltage is used for enabling the ith row of LED lamps to be lightened, and enabling parasitic capacitors on the row line where the ith row of LED lamps are located to start to discharge from the target voltage when the preset time length is over, the LED display screen comprises a plurality of rows of LED lamps, and i is a positive integer.
According to another aspect of the embodiments of the present invention, there is provided an LED display screen including: the LED display screen comprises a plurality of rows of LED lamps, wherein two stages of the plurality of rows of LED lamps are respectively connected with row lines in the LED display screen and column lines in the LED display screen; and the signal generator is connected with the row lines in the LED display screen, and is used for controlling the voltage of the row line where the ith row of LED lamps in the LED display screen is located to be reduced to a target voltage within a preset time length, the target voltage is used for enabling the ith row of LED lamps to be lightened, the parasitic capacitance of the row line where the ith row of LED lamps is located is enabled to start to discharge from the target voltage when the preset time length is over, and i is a positive integer.
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 of an alternative display control circuit for an LED display screen according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an alternative display control circuit for an LED display screen according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a display control circuit of an alternative LED display screen according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an alternative signal generator output waveform in accordance with embodiments of the present invention;
FIG. 8 is a diagram illustrating waveforms of voltages on an alternative ROW (n) row line, according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of an alternative signal generator output waveform in accordance with an embodiment of the present invention;
FIG. 10 is a diagram illustrating waveforms of voltages on an alternative ROW (n) row line, according to an embodiment of the present invention;
fig. 11 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 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 lamps on the previous row may generate 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 is not matched with the set display effect, and abnormal image display occurs.
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 for an LED display screen, where the LED display screen includes a plurality of rows of LED lamps, and a flow of the display control method for the LED display screen may include the following steps:
step S302, within a preset time length before display control of an ith row of LED lamps in an LED display screen is finished, controlling the voltage on a row line where the ith row of LED lamps is located to be reduced to a first target voltage through a signal generator, wherein the first target voltage is greater than the threshold voltage of the LEDs, and i is a positive integer;
step S304, after the display control of the ith row of LED lamps is finished and before the display control of the (i +1) th row of LED lamps is performed, discharging the parasitic capacitance on the row line where the ith row of LED lamps is located from the first target voltage to a second target voltage, where the second target voltage is less than the threshold voltage of the LEDs.
Optionally, for the LED display screen, the pair of LED display screens includes a plurality of rows of LED lamps, each row may include a plurality of LED lamps, and when the LED lamps of the ith row are scanned, the LED lamps of the ith row may be subjected to display control.
Within a preset time before the display control of the ith row of LED lamps in the LED display screen is finished, because the output end of the signal generator is connected with the input end of the row line of the ith row of LED lamps, the voltage output by the signal generator can directly control the voltage on the row line where the ith row of LED lamps is located to be reduced to a first target voltage.
It should be noted that the first target voltage is greater than the threshold voltage of the LED lamp, after the preset time period is over, the parasitic capacitor on the row line where the ith row of LED lamps is located can start to discharge from the first target voltage and discharge to the second target voltage, and the second target voltage is less than the threshold voltage of the LED lamp, so that the charges on the parasitic capacitor can start to discharge from the first target voltage, and the charges on the parasitic capacitor can be released more quickly.
Optionally, in this embodiment, the signal generator is connected to a plurality of row lines in the LED display screen.
The following describes a specific manner of connecting the signal generator to the plurality of row lines in the LED display screen.
As shown in fig. 4, the LED display panel includes a plurality of rows of LED lamps (3 rows are shown), the input terminals of the plurality of rows of LED lamps can be connected to a general signal generator, and the general signal generator controls the plurality of rows of LED lamps to reduce the voltage on the row lines of the plurality of rows of LED lamps to a first target voltage.
Alternatively, as shown in fig. 5, the LED display screen includes a plurality of rows of LED lamps (3 rows are shown in the figure), a signal generator may be connected to an input terminal of each row of LED lamps, and the signal generator connected to each row of LED lamps independently controls the LED lamps in the row, so that the voltage on the row line of each row of LED lamps is reduced to the first target voltage.
Alternatively, as shown in fig. 6, the LED display screen includes a plurality of rows of LED lamps (3 rows are shown in the figure), the input ends of two rows of LED lamps are connected to one signal generator, the remaining row of LED lamps is connected to another signal generator, and the two rows of LED lamps are controlled by the signal generator connected to the two rows of LED lamps, so that the voltages on the row lines of the two rows of LED lamps are reduced to the target voltage; and controlling the LED lamps in the rest row by another signal generator connected with the LED lamps in the rest row to reduce the voltage on the row line of the LED lamps in the row to the first target voltage.
In case the LED display screen comprises a plurality of rows of LED lamps, any 2, 3, 4, etc. of the plurality of rows of LED lamps may also be connected to one signal generator. It is understood that the above description is only an example, and the present implementation is not limited thereto.
Through the embodiment, for the LED display screen, the LED display screen includes multiple rows of LED lamps, in the process of performing display control on the LED lamps of the LED display screen, when scanning the i-th row of LED lamps of the LED display screen, performing display control on the i-th row of LED lamps, within a preset time period before the display control on the i-th row of LED lamps in the LED display screen is completed, controlling, by a signal generator, a voltage on a row line where the i-th row of LED lamps is located to decrease to a first target voltage, where the first target voltage is greater than a threshold voltage of an LED, after the display control on the i-th row of LED lamps is completed, before the display control on the i + 1-th row of LED lamps, so that a parasitic capacitor on the row line where the i-th row of LED lamps is located starts to discharge from the first target voltage and decreases to a second target voltage, where the second target voltage is less than the threshold voltage of the LED. Through the mode, when the preset time length is finished, the voltage on the row line where the ith row of LED lamps is located is reduced to the first target voltage through the signal generator, the first target voltage is larger than the threshold voltage of the ith row of LED lamps, the parasitic capacitor on the row line where the ith row of LED lamps is located starts to discharge from the first target voltage when the preset time length is finished and discharges to the second target voltage, the second target voltage is smaller than the threshold voltage of the LED lamps, the charge on the parasitic capacitor can start to discharge from the first target voltage, the charge on the parasitic capacitor can be released more quickly, the LED lamps cannot be charged by the parasitic capacitor and are lightened to generate a ghost phenomenon, and the technical problem that the ghost phenomenon can occur when an LED display screen displays images is solved.
In an optional embodiment, the controlling, by the signal generator, the voltage on the row line where the ith row of LED lamps is located to decrease to the first target voltage within a preset time period before the display control on the ith row of LED lamps in the LED display screen is finished includes: and at a first moment before the preset time length is finished, sending a voltage signal to a column line where the ith row of LED lamps is located through the signal generator, wherein the voltage signal is used for reducing the voltage of the column line where the ith row of LED lamps is located to the first target voltage before the display control of the ith row of LED lamps is finished.
Optionally, at a first time before the preset time period ends, a voltage signal output by the signal generator may be used, where the voltage signal may enable the voltage of the row line where the ith row of LED lamps is located to decrease to the first target voltage before the display control of the ith row of LED lamps is ended.
Optionally, the decreasing voltage signal is a linearly decreasing voltage signal. The signal generator may be controlled to output a waveform as shown in fig. 7, such that at a first time before the preset time period (e.g., T1 in fig. 7) ends, the voltage on the row line where the ith row of LED lamps is controlled by the signal generator to start to decrease, and at the end of the preset time period, the voltage on the row line where the ith row of LED lamps is controlled by the signal generator to decrease to a first target voltage.
It should be noted that, when the signal generator outputs a voltage value having a waveform shown in fig. 7, a waveform of a voltage on a row line where the i-th row of LED lamps is located is shown in fig. 8.
Alternatively, the signal generator may be further controlled to output a voltage value with a waveform as shown in fig. 9, where the waveform of the voltage on the row line where the ith row of LED lamps is located is shown in fig. 10.
It is understood that the above is only an example, and the present embodiment is not limited thereto.
Through the embodiment, the voltage value of the voltage on the row line where the ith row of LED lamps is located is controlled through the waveform output by the signal generator, and when the preset time length is over, the parasitic capacitor can start to discharge from the first target voltage, so that the discharge period of the parasitic capacitor is reduced, and the discharge speed of the parasitic capacitor is improved.
In an alternative embodiment, the providing a voltage signal to the row line where the ith row of LED lamps is located by the signal generator includes: and at a first moment before the preset time length is ended, a voltage signal with the voltage value being the first target voltage is sent to a row line where the ith row of LED lamps is located through the signal generator, and the voltage signal is kept at the moment when the ith row of LED lamps is controlled to be displayed, so that the voltage of the row line where the ith row of LED lamps is located is reduced to the first target voltage.
Optionally, at a first time before the preset time period ends, the signal generator may be controlled to output a voltage signal having a voltage value equal to a first target voltage, and the voltage value of the ith row of LEDs is kept at the first target voltage value until the display control of the ith row of LED lamps is ended, so that the voltage value of the ith row of LED lamps can be decreased to the first target voltage at the end time of the display control of the ith row of LED lamps.
For example, the signal generator may be controlled to output a waveform as shown in scheme 1 of fig. 9, at a first time, the voltage on the row line where the ith row of LED lamps is located is directly lowered to a first target voltage by the control of the signal generator, and after the first time until the preset time period is over, the voltage on the row line where the ith row of LED lamps is located is maintained at the first target voltage by the signal generator.
It should be noted that, when the signal generator outputs the waveform shown in scheme 1 of fig. 9, the waveform of the voltage on the row line where the i-th row of LED lamps is located is shown in scheme 1 of fig. 10.
Through the embodiment, the voltage value of the voltage on the row line where the ith row of LED lamps is located is controlled through the waveform output by the signal generator, and when the preset time length is over, the parasitic capacitor can start to discharge from the first target voltage, so that the discharge period of the parasitic capacitor is reduced, and the discharge speed of the parasitic capacitor is improved.
In an alternative embodiment, the providing a voltage signal to the row line where the ith row of LED lamps is located by the signal generator includes: and during the period from the first time to a second time, giving a descending voltage signal to the row line where the ith row of LED lamps is located through the signal generator, wherein the second time is the time before the display control of the ith row of LED lamps is finished, and the voltage value of the descending voltage signal is the first target voltage at the second time.
Alternatively, the control signal generator may output a decreasing voltage signal from the first time to the second time, so that the voltage across the i-th row of LED lamps can gradually decrease according to the decreasing voltage signal until the time (i.e., the second time) before the display control of the i-th row of LED lamps is finished, at which time the voltage across the i-th row of LED lamps decreases to the first target voltage.
Optionally, the decreasing voltage signal is a stepped decreasing voltage signal. The signal generator may be controlled to output a waveform as shown in fig. 9, scheme 2, at a first time, the voltage on the row line where the i-th row of LED lamps is located is directly reduced to a first voltage by the control of the signal generator, and at a second time after the first time and before the end of the preset time period, the voltage on the row line where the i-th row of LED lamps is located is maintained at the first voltage (the first voltage is greater than the first target voltage) by the signal generator; and at the second moment, directly reducing the voltage on the row line where the ith row of LED lamps is located to a first target voltage through the control of the signal generator, and keeping the voltage on the row line where the ith row of LED lamps is located to be the first target voltage through the signal generator after the second moment until the preset time length is finished.
It should be noted that, when the signal generator outputs the waveform shown in scheme 2 of fig. 9, the waveform of the voltage on the row line where the i-th row of LED lamps is located is shown in scheme 2 of fig. 10.
Optionally, the decreasing voltage signal is a non-linear decreasing voltage signal. The signal generator may be controlled to output a waveform as shown in fig. 9, in scheme 3, from a first time point until the preset time period ends, the signal generator controls the voltage on the row line where the ith row of LED lamps is located to continuously decrease until the voltage decreases to a first target voltage, and at the end of the preset time period, the voltage on the row line where the ith row of LED lamps is located is the first target voltage.
It should be noted that, when the signal generator outputs the waveform shown in the scheme 3 in fig. 9, the waveform of the voltage on the row line where the i-th row of LED lamps is located is shown in the scheme 3 in fig. 10.
Through the embodiment, the voltage value of the voltage on the row line where the ith row of LED lamps is located is controlled through the waveform output by the signal generator, and when the preset time length is over, the parasitic capacitor can start to discharge from the target voltage, so that the discharge period of the parasitic capacitor is reduced, and the discharge speed of the parasitic capacitor is improved.
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 column lines, and LEDs are connected at the intersections of the row lines and the column lines;
and the signal generator is used for controlling the voltage on the row line where the ith row of LED lamps is located to be reduced to a first target voltage, wherein the first target voltage is greater than the threshold voltage of the LEDs, i is a positive integer, after the display control of the ith row of LED lamps is finished, before the display control of the (i +1) th row of LED lamps is carried out, the parasitic capacitor on the row line where the ith row of LED lamps is located is discharged to a second target voltage from the first target voltage, and the second target voltage is less than the threshold voltage of the LEDs.
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 control circuit of the LED display screen may refer to the circuits shown in fig. 4, 5, and 6. The specific process is as follows:
alternatively, the timing relationship between the waveform of the signal generator and the signal row (n) is shown in fig. 7, wherein the high voltage is VCC, and the voltage change start time must be within the turn-on time of row (n), i.e., the rising edge of row (n) signal is in the process of voltage change.
Alternatively, when the waveform of the signal generator is outputted as shown in fig. 7, the voltage on the specific Row line is shown in fig. 8, and Row (n) is turned on, the Row line is at a high voltage, it is necessary to ensure that the voltage difference with the column line is greater than or equal to the threshold voltage of the LED, at the end stage of turn-on of Row (n), the voltage on the Row line drops, and after the voltage drops to a certain voltage value (target voltage) (it is still necessary to ensure that the LED can be lit), the Row signal is turned off.
Alternatively, after turning off row (n), the voltage on the parasitic capacitance may be lowered from V2 (the first target voltage) to the target value (the second target voltage), making it easier to quickly discharge the parasitic capacitance.
It should be noted that the output waveform of the signal generator may be, but is not limited to, the waveform shown in fig. 9, which corresponds to the waveform on the row line shown in fig. 10.
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 design, after Row (n) is turned off, the charge on the Row line is not quickly released due to the parasitic capacitance, and when Row (n +1) is turned on, the data line is also pulled low, so that there is a risk that the LED on Row (n) may be triggered by mistake and turned on.
By adopting the embodiment of the application, the voltage can be pulled down to a certain proper level (such as the first target voltage) at the last stage of the Row opening, and after the Row is closed, the voltage on the parasitic capacitor on the Row line is reduced to the target value (the second target voltage) from the first target voltage instead of the original VCC, so that the charge of the Row is basically reduced to the target value (the second target voltage) when the next Row is opened, the LED of the previous Row cannot be triggered, and the ghost phenomenon is solved.
Through this embodiment, through signal generator output control signal, VCC signal voltage reduces to target voltage before making the switch tube of present rowline close to resume before the switch tube to next rowline opens, thereby parasitic capacitance on this rowline can follow a lower voltage drop to target voltage after making the switch tube of rowline close, has not only eliminated ghost phenomenon, has still reduced parasitic capacitance's the cycle of release electric charge, has improved parasitic capacitance's the efficiency of discharging.
According to still another aspect of the embodiments of the present invention, there is also provided a display control apparatus of an LED display screen, as shown in fig. 11, the apparatus including:
the control unit 1102 is configured to control, by a signal generator, a voltage on a row line where an ith row of LED lamps in an LED display screen is located to decrease to a first target voltage within a preset time period before display control on the ith row of LED lamps in the LED display screen is completed, where the first target voltage is greater than a threshold voltage of the LED, and i is a positive integer;
and a processing unit 1104, configured to discharge a parasitic capacitor on a row line where the ith row of LED lamps is located from the first target voltage to a second target voltage after the display control of the ith row of LED lamps is finished and before the display control of the (i +1) th row of LED lamps is performed, where the second target voltage is less than a threshold voltage of the LEDs.
Through the embodiment, for the LED display screen, the LED display screen includes multiple rows of LED lamps, in the process of performing display control on the LED lamps of the LED display screen, when scanning the i-th row of LED lamps of the LED display screen, performing display control on the i-th row of LED lamps, within a preset time period before the display control on the i-th row of LED lamps in the LED display screen is completed, controlling, by a signal generator, a voltage on a row line where the i-th row of LED lamps is located to decrease to a first target voltage, where the first target voltage is greater than a threshold voltage of an LED, after the display control on the i-th row of LED lamps is completed, before the display control on the i + 1-th row of LED lamps, so that a parasitic capacitor on the row line where the i-th row of LED lamps is located starts to discharge from the first target voltage and decreases to a second target voltage, where the second target voltage is less than the threshold voltage of the LED. Through the mode, when the preset time length is finished, the voltage on the row line where the ith row of LED lamps is located is reduced to the first target voltage through the signal generator, the first target voltage is larger than the threshold voltage of the ith row of LED lamps, the parasitic capacitor on the row line where the ith row of LED lamps is located starts to discharge from the first target voltage when the preset time length is finished and discharges to the second target voltage, the second target voltage is smaller than the threshold voltage of the LED lamps, the charge on the parasitic capacitor can start to discharge from the first target voltage, the charge on the parasitic capacitor can be released more quickly, the LED lamps cannot be charged by the parasitic capacitor and are lightened to generate a ghost phenomenon, and the technical problem that the ghost phenomenon can occur when an LED display screen displays images is solved.
As an optional technical solution, the control unit includes: and the control module is used for sending a voltage signal to a column line where the ith row of LED lamps is located through the signal generator at a first moment before the preset time length is finished, wherein the voltage signal is used for reducing the voltage of the column line where the ith row of LED lamps is located to the first target voltage before the display control of the ith row of LED lamps is finished.
As an optional technical solution, the control module is further configured to, at a first time before the preset time length is ended, send a voltage signal with a voltage value equal to the first target voltage to a row line where the ith row of LED lamps is located through the signal generator, and keep the voltage signal at a time when display control of the ith row of LED lamps is ended, so that the voltage of the row line where the ith row of LED lamps is located is decreased to the first target voltage.
As an optional technical solution, the control module is further configured to give a decreasing voltage signal to the row line where the ith row of LED lamps is located through the signal generator during a period from the first time to a second time, where the second time is a time before display control of the ith row of LED lamps is finished, and a voltage value of the decreasing voltage signal is the first target voltage at the second time.
As an optional technical solution, the decreasing voltage signal is a linearly decreasing voltage signal.
As an optional technical solution, the decreasing voltage signal is a non-linear decreasing voltage signal.
As an optional technical solution, the decreasing voltage signal is a stepped decreasing voltage signal.
Embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, wherein the computer program is arranged to perform the steps of any of the above-mentioned method embodiments when executed.
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 also provide an electronic device comprising a memory having a computer program stored therein and a processor arranged to run the computer program to perform the steps of any of the above method embodiments.
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 (10)

1. A display control method of an LED display screen, wherein the LED display screen comprises a plurality of rows of LED lamps, is characterized by comprising the following steps:
within a preset time before display control of an ith row of LED lamps in an LED display screen is finished, controlling the voltage on a row line where the ith row of LED lamps is located to be reduced to a first target voltage through a signal generator, wherein the first target voltage is greater than the threshold voltage of the LEDs, and i is a positive integer;
after the display control of the ith row of LED lamps is finished and before the display control of the (i +1) th row of LED lamps is carried out, the parasitic capacitance on the row line where the ith row of LED lamps is located is discharged from the first target voltage to a second target voltage, wherein the second target voltage is smaller than the threshold voltage of the LEDs.
2. The method of claim 1, wherein the controlling, by the signal generator, the voltage on the row line where the ith row of LED lamps is located to be reduced to the first target voltage within a preset time period before the display control on the ith row of LED lamps in the LED display screen is finished comprises:
and at a first moment before the preset time length is finished, sending a voltage signal to a row line where the ith row of LED lamps is located through the signal generator, wherein the voltage signal is used for reducing the voltage of the row line where the ith row of LED lamps is located to the first target voltage before the display control of the ith row of LED lamps is finished.
3. The method of claim 2, wherein said providing a voltage signal to the row line on which the ith row of LED lamps is located via the signal generator comprises:
and at a first moment before the preset time length is finished, a voltage signal with the voltage value being the first target voltage is sent to a row line where the ith row of LED lamps is located through the signal generator, and the voltage signal is kept at the moment when the ith row of LED lamps is subjected to display control, so that the voltage of the row line where the ith row of LED lamps is located is reduced to the first target voltage.
4. The method of claim 2, wherein said providing a voltage signal to the row line on which the ith row of LED lamps is located via the signal generator comprises:
and during the period from the first moment to a second moment, giving a descending voltage signal to the row line where the ith row of LED lamps is located through the signal generator, wherein the second moment is the moment before the display control of the ith row of LED lamps is finished, and the voltage value of the descending voltage signal is the first target voltage at the second moment.
5. The method of claim 4, wherein the decreasing voltage signal is a linearly decreasing voltage signal.
6. The method of claim 4, wherein the decreasing voltage signal is a non-linearly decreasing voltage signal.
7. The method of claim 6, wherein the decreasing voltage signal is a stepped decreasing voltage signal.
8. An LED display screen, comprising:
the display device comprises a display array, a light source and a light source, wherein the display array comprises a plurality of row lines and a plurality of column lines, and LEDs are connected at the intersections of the row lines and the column lines;
and the signal generator is used for controlling the voltage on the row line where the ith row of LED lamps is located to be reduced to a first target voltage, wherein the first target voltage is greater than the threshold voltage of the LEDs, i is a positive integer, after the display control of the ith row of LED lamps is finished, before the display control of the (i +1) th row of LED lamps is carried out, the parasitic capacitor on the row line where the ith row of LED lamps is located is discharged to a second target voltage from the first target voltage, and the second target voltage is less than the threshold voltage of the LEDs.
9. A computer-readable storage medium, comprising a stored program, wherein the program when executed performs the method of any one of claims 1 to 7.
10. An electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to execute the method of any of claims 1 to 7 by means of the computer program.
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