CN113450699B - 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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CN113450699B
CN113450699B CN202010645164.5A CN202010645164A CN113450699B CN 113450699 B CN113450699 B CN 113450699B CN 202010645164 A CN202010645164 A CN 202010645164A CN 113450699 B CN113450699 B CN 113450699B
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voltage
line
display screen
row
control signal
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CN113450699A (en
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周满城
陈柏辅
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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 method comprises the following steps: after finishing display control on an ith row of LED lamps in an LED display screen and before starting display control on an (i +1) th row of LED lamps in the LED display screen, controlling the voltages of two stages of a plurality of rows of LED lamps to be equal, wherein the LED display screen comprises a plurality of rows of LED lamps, and i is a natural number; and when the (i +1) th line of LED lamps in the LED display screen are scanned, performing display control on the (i +1) th line of LED lamps. By adopting the technical scheme, the problem that the LED display screen in the related art has a ghost phenomenon during displaying 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, the LED display screen has higher requirements on line driving, and the line driving is developed from the realization of line switching by a pure P-MOSFET to the multi-functional line driving with higher integration level and stronger function.
With the improvement of the function of the LED, the display effect is more one floor, but the problems 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, including: after finishing display control on the ith row of LED lamps in the LED display screen and before starting display control on the (i +1) th row of LED lamps in the LED display screen, controlling the voltages of two stages of a plurality of rows of LED lamps to be equal, wherein the LED display screen comprises the plurality of rows of LED lamps, and when i is a natural number and the (i +1) th row of LED lamps in the LED display screen are scanned, performing display control on the (i +1) th row of LED lamps.
According to the invention, in the process of carrying out display control on the LED lamps of the LED display screen, when scanning the LED lamps of the ith row of the LED display screen, the LED lamps of the ith row are subjected to display control, after the display control on the LED lamps of the ith row is finished and before the display control on the LED lamps of the (i +1) th row of the LED display screen is started, the voltages of two stages of the LED lamps of the multiple rows of the LED display screen are controlled to be equal, and when scanning the LED lamps of the (i +1) th row, the LED lamps of the (i +1) th row are subjected to display control. Through the mode, the voltages of the two stages of the multi-row LED lamps of the LED display screen are controlled to be equal, so that the charges of the parasitic capacitors on the display control circuit corresponding to the LED display screen can be released, the LED lamps cannot be charged by the parasitic capacitors and are lightened to generate a ghost phenomenon, and the technical problem that the ghost phenomenon occurs when the LED display screen displays is solved.
Optionally, the controlling the voltages of the two stages of the rows of LED lamps to be equal comprises: and controlling the voltage on a row line in the LED display screen to be equal to the voltage on a column line in the LED display screen, wherein the voltage on the row line and the voltage on the column line are the voltages of two stages of the LED lamps.
Optionally, the controlling the voltage on the row line in the LED display panel to be equal to the voltage on the column line in the LED display panel includes: under the condition that each row line in the LED display screen is connected with an input end of a control signal through an MOS tube, each row line is connected with the MOS tube connected with each row line, each column line in the LED display screen is connected with the input end of the control signal through an MOS tube, and each column line is connected with the MOS tube connected with each column line, the MOS tubes connected with each row line and each column line are opened through the control signal input by the input end of the control signal, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, wherein the target voltage is a grounding voltage or a preset voltage greater than the grounding voltage.
Optionally, the controlling the voltage on the row line in the LED display panel to be equal to the voltage on the column line in the LED display panel includes: under the condition that each row line in the LED display screen is connected with an input end of a control signal through an MOS tube, each row line is connected with the same row line through the MOS tube connected with each row line, each row line in the LED display screen is connected with an input end of the control signal through an MOS tube, and each row line is connected together through the MOS tube connected with each row line, the MOS tubes connected with each row line and each row line are opened through the control signal input by the input end of the control signal, so that the voltage on each row line and the voltage on each row line are equal to a target voltage, wherein the target voltage is a grounding voltage or a preset voltage greater than the grounding voltage.
Optionally, the controlling the voltage on the row line in the LED display panel to be equal to the voltage on the column line in the LED display panel includes: each row line in the LED display screen is connected with an input end of a control signal through an MOS tube, each row line is connected together through the MOS tube connected with each row line, each column line in the LED display screen is connected with an input end of the control signal through an MOS tube, and under the condition that each column line is connected with the same row line through the MOS tube connected with each column line, the MOS tubes connected with each row line and each column line are opened through the control signal input by the input end of the control signal, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, wherein the target voltage is a grounding voltage or a preset voltage greater than the grounding voltage.
Optionally, the method further includes: when the MOS transistors connected to the row lines and the column lines, respectively, are turned on by the control signal input through the control signal input terminal, the MOS transistors disposed at the output terminals of the column lines are controlled to be turned off by the control signal input through the control signal input terminal, so that the output terminals of the column lines are not directly connected to the ground, wherein the MOS transistors disposed at the output terminals of the column lines are connected to the column lines, the output terminals of the column lines, and the control signal, respectively.
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 first control unit is used for controlling the voltages of two stages of a plurality of rows of LED lamps to be equal after finishing the display control of the ith row of LED lamps in the LED display screen and before starting the display control of the (i +1) th row of LED lamps in the LED display screen, wherein the LED display screen comprises a plurality of rows of LED lamps, and i is a natural number; and the third control unit is used for carrying out display control on the (i +1) th line of LED lamps when the (i +1) th line of LED lamps in the LED display screen is scanned.
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; an input terminal for a control signal; and the display control circuit is connected with the input end of the control signal and is connected with the row lines in the LED display screen and the column lines in the LED display screen, wherein the display control circuit is used for controlling the voltage on the row lines in the LED display screen to be equal to the voltage on the column lines in the LED display screen through the control signal input by the input end of the control signal after the display control on the ith row LED lamps in the plurality of rows of LED lamps is finished and before the display control on the (i +1) th row LED lamps in the LED display screen is started, the voltages on the row lines and the column lines are the voltages of two stages of the plurality of rows of LED lamps respectively, and i is a natural number.
Optionally, the display control circuit includes: each row line in the LED display screen is connected with the input end of the control signal through one MOS tube in the first group of MOS tubes, and each row line is connected together through the MOS tube connected with each row line; each column line in the LED display screen is respectively connected with the input end of the control signal through one MOS tube in the second group of MOS tubes, and the column lines are connected together through the MOS tube connected with the column lines; when the control signal is input to the input end of the control signal, the first group of MOS transistors and the second group of MOS transistors are turned on, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, where the target voltage is a ground voltage or a preset voltage greater than the ground voltage.
Optionally, the display control circuit includes: each row line in the LED display screen is connected with the input end of the control signal through one MOS tube in the first group of MOS tubes, and each row line is connected with the same row line through the MOS tube connected with each row line; each column line in the LED display screen is respectively connected with the input end of the control signal through one MOS tube in the second group of MOS tubes, and the column lines are connected together through the MOS tube connected with the column lines; when the control signal is input to the input end of the control signal, the first group of MOS transistors and the second group of MOS transistors are turned on, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, where the target voltage is a ground voltage or a preset voltage greater than the ground voltage.
Optionally, the display control circuit includes: each row line in the LED display screen is connected with the input end of the control signal through one MOS tube in the first group of MOS tubes, and each row line is connected together through the MOS tube connected with each row line; each column line in the LED display screen is respectively connected with the input end of the control signal through one MOS tube in the second group of MOS tubes, and each column line is connected with the same row line through the MOS tube connected with each column line; when the control signal is input at the input end of the control signal, the first group of MOS transistors and the second group of MOS transistors are turned on, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, wherein the target voltage is a ground voltage or a preset voltage greater than the ground voltage.
Optionally, the method further comprises: and a third group of MOS transistors, each of the MOS transistors of the third group of MOS transistors being respectively disposed at an output end of one of the column lines, each of the MOS transistors of the third group of MOS transistors being respectively connected to one of the column lines, an output end of the one of the column lines, and the control signal, wherein when the control signal is input at an input end of the control signal, the third group of MOS transistors is turned off, so that the output end of each of the column lines is not directly connected to the ground.
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 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 circuit timing diagram of an alternative display control circuit of the LED display screen according to the embodiment of the invention;
FIG. 6 is a schematic diagram of an alternative display control circuit for an LED display screen according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a display control circuit of an alternative LED display screen according to an embodiment of the present invention;
fig. 8 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 spacing, the LED display panel has higher requirements for row driving, from the simple P-MOSFET to the multifunctional row driving with higher integration and stronger functions, for example, as shown in fig. 1, when a row (n) of the LED display panel is opened, a row out (n) of the LED display panel outputs, and the LED1 lights up, and out (n) has a pulse width modulation waveform, which corresponds to the scattering function of the LED display panel, so as to improve the refresh rate and the function of the LED display panel, so that the display effect of the LED display panel is better for the first floor, but the problems derived therefrom 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 in the previous row may generate an upper ghost 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 the parasitic capacitance on the column line, if the previous row of LEDs 5 is set to be lit, the current row of LEDs 2 is not lit, because of the existence of the parasitic capacitance, when the LEDs 5 are lit, the parasitic capacitance on the data line OUTm +1 is charged, and if the charges are not released in time when the row (n) is opened, the LEDs 2 are opened, which is not matched with the set display effect, and the 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 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, after finishing display control of the ith row of LED lamps in the LED display screen and before starting display control of the (i +1) th row of LED lamps in the LED display screen, controlling two stages of a plurality of rows of LED lamps to be equal in voltage, wherein the LED display screen comprises a plurality of rows of LED lamps, and i is a natural number.
Optionally, for the LED display screen, the LED display screen 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.
After the display control of the LED lamp of the ith row is finished and before the display control of the LED lamp of the (i +1) th row of the LED display screen is started, the voltages of two stages of the LED lamps of the plurality of rows in the LED display screen may be controlled to be equal.
By the mode, the two stages of voltages of the LED lamps in multiple rows are equal, so that charges of parasitic capacitors on a display control circuit of the LED display screen can be released, and the LED lamps on the LED display screen cannot be charged by the parasitic capacitors and lightened to generate a ghost phenomenon.
And step S304, when the (i +1) th line of LED lamps in the LED display screen are scanned, performing display control on the (i +1) th line of LED lamps.
Optionally, when the i +1 th row of LED lamps of the LED display screen is scanned, display control is started on the i +1 th row of LED lamps.
Through the embodiment, for the LED display screen, the LED display screen includes a plurality of rows of LED lamps, in the process of performing display control on the LED lamps of the LED display screen, when the i-th row of LED lamps of the LED display screen is scanned, the display control is performed on the i-th row of LED lamps, after the display control on the i-th row of LED lamps is finished and before the display control on the i + 1-th row of LED lamps of the LED display screen is started, the voltages of two stages of the plurality of rows of LED lamps of the LED display screen are controlled to be equal, and when the i + 1-th row of LED lamps is scanned, the display control is performed on the i + 1-th row of LED lamps. In this way, the voltages of the two stages of the multiple rows of LED lamps of the LED display screen are controlled to be equal, so that the charges of the parasitic capacitors on the display control circuit corresponding to the LED display screen can be released, the LED lamps 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 controlling the voltages of the two stages of the plurality of rows of LED lamps to be equal comprises: and controlling the voltage on a row line in the LED display screen to be equal to the voltage on a column line in the LED display screen, wherein the voltage on the row line and the voltage on the column line are the voltages of two stages of the LED lamps.
Alternatively, controlling the voltages of two stages of a plurality of rows of LED lamps to be equal may be implemented as follows: and controlling the voltage of the two stages of the LED lamps on the row line of the LED display screen to be equal to the voltage of the two stages of the LED lamps on the column line of the LED display screen.
In an alternative embodiment, the controlling the voltage on the row line of the LED display panel to be equal to the voltage on the column line of the LED display panel includes: under the condition that each row line in the LED display screen is connected with an input end of a control signal through an MOS tube, each row line is connected with the MOS tube connected with each row line, each column line in the LED display screen is connected with an input end of the control signal through an MOS tube, and each column line is connected with the MOS tube connected with each column line, the MOS tubes connected with each row line and each column line are opened through the control signal input by the input end of the control signal, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, wherein the target voltage is a grounding voltage or a preset voltage greater than the grounding voltage.
Alternatively, as shown in fig. 4, in the display control circuit corresponding to the LED display screen, each row line is connected to an input end of a control signal through a MOS transistor (such as a PMOS transistor or an NMOS transistor), each row line is connected to a MOS transistor connected to each row line, each column line is connected to an input end of the control signal through a MOS transistor, and each column line is connected to a MOS transistor connected to each column line, the MOS transistors connected to each row line and each column line may be controlled to be turned on through the control signal input by the input end of the control signal, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, where the target voltage is a ground voltage or a preset voltage greater than the ground voltage, for example, the target voltage is 0V, and a voltage other than 0V may be required to be applied, however, the voltage applied cannot be higher than the blanking voltage (corresponding to the preset voltage), because above the blanking voltage, the LED lamp is at risk of being lit when the line is turned on and the data line is pulled down.
In addition, the circuit timing chart shown in fig. 5 can be obtained by performing the display control of the LED lamps in the LED display panel according to the circuit diagram shown in fig. 4, that is, after the Row (n) (corresponding to the ith Row of LED lamps) is turned on, before the Row (n +1) (corresponding to the i +1 th Row of LED lamps) is turned on, i.e., T2 ≧ 0, and it must be within T3. After Row (n) is turned off, the Ctr control signal (corresponding to the control signal) turns on all the PMOS transistors controlled by the Ctr control signal, at this time, all the column lines and the data line have the same potential and are at 0V to the ground voltage, the voltage difference between the cathode and the anode of the light emitting diode is 0V, all the lamps are not lighted, and after the Ctr control signal turns off all the PMOS controlled by the Ctr control signal, the Row (n +1) (corresponding to the i +1 th Row of LED lamps) is controlled to be turned on.
Through the embodiment, the voltages of all the row lines and the column lines are equal to the target voltage, when the target voltage is the grounding voltage or the preset voltage which is greater than the grounding voltage, the voltages to the grounding voltage of all the row lines and the column lines can be 0V or greater than 0V, the charges on the parasitic capacitor in the display control circuit can be released, and therefore the LED can not be lighted by mistake to cause ghost to appear, and the ghost problem is solved.
In an alternative embodiment, said controlling the voltage on the row line in the LED panel to be equal to the voltage on the column line in the LED panel comprises: under the condition that each row line in the LED display screen is connected with an input end of a control signal through an MOS tube, each row line is connected with the same row line through the MOS tube connected with each row line, each row line in the LED display screen is connected with an input end of the control signal through an MOS tube, and each row line is connected together through the MOS tube connected with each row line, the MOS tubes connected with each row line and each row line are opened through the control signal input by the input end of the control signal, so that the voltage on each row line and the voltage on each row line are equal to a target voltage, wherein the target voltage is a grounding voltage or a preset voltage greater than the grounding voltage.
Optionally, the display control circuit of the LED display screen may be further connected as shown in fig. 6, where each row line is connected to an input end of a control signal through a MOS transistor (such as a PMOS transistor or an NMOS transistor), each row line is connected to the same column line through a MOS transistor connected to each row line, each column line is connected to an input end of a control signal through a MOS transistor, and each column line is connected to each column line through a MOS transistor connected to each column line, the MOS transistors connected to each row line and each column line are turned on through the control signal input by the input end of the control signal, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, where the target voltage is a ground voltage or a preset voltage greater than the ground voltage, for example, the target voltage is 0V, and a voltage other than 0V may be switched on, however, the connected voltage cannot be higher than the blanking voltage (corresponding to the preset voltage), because above the blanking voltage, the LED lamp may be lighted when the line is opened and the data line is pulled down.
Through the embodiment, the voltages of all the row lines and the column lines are equal to the target voltage, when the target voltage is the grounding voltage or the preset voltage which is greater than the grounding voltage, the voltages to the grounding voltage of all the row lines and the column lines can be 0V or greater than 0V, the charges on the parasitic capacitor in the display control circuit can be released, and therefore the LED can not be lighted by mistake to cause ghost to appear, and the ghost problem is solved.
In an alternative embodiment, said controlling the voltage on the row line in the LED panel to be equal to the voltage on the column line in the LED panel comprises: each row line in the LED display screen is connected with an input end of a control signal through an MOS tube, each row line is connected together through the MOS tube connected with each row line, each column line in the LED display screen is connected with an input end of the control signal through an MOS tube, and under the condition that each column line is connected with the same row line through the MOS tube connected with each column line, the MOS tubes connected with each row line and each column line are opened through the control signal input by the input end of the control signal, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, wherein the target voltage is a grounding voltage or a preset voltage greater than the grounding voltage.
Optionally, the display control circuit of the LED display panel may be further connected as shown in fig. 7, where each row line in the LED display panel is connected to an input end of a control signal through an MOS transistor (e.g., a PMOS transistor or an NMOS transistor), each row line is connected together through an MOS transistor connected to each row line, each column line in the LED display panel is connected to an input end of the control signal through an MOS transistor, and each column line is connected to the same row line through an MOS transistor connected to each column line, the control signal input through the input end of the control signal turns on the MOS transistors connected to each row line and each column line, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, where the target voltage is a ground voltage or a preset voltage greater than the ground voltage, if the target voltage is 0V, a voltage other than 0V may be required to be applied, but the applied voltage cannot be higher than the blanking voltage (corresponding to the preset voltage), because above the blanking voltage, the LED lamp is at risk of being turned on when the line is turned on and the data line is pulled down.
Through the embodiment, the voltages of all the row lines and the column lines are equal and equal to the target voltage, when the target voltage is the ground voltage or the preset voltage which is greater than the ground voltage, the voltages to the ground of all the row lines and the column lines can be 0V or greater than 0V, the charges on the parasitic capacitor in the display control circuit can be released, and therefore the LED cannot be mistakenly lightened to cause ghost display, and the ghost problem is solved.
In an optional embodiment, the method further includes: when the MOS transistor connected to each row line and each column line is turned on by the control signal input through the control signal input terminal, the MOS transistor disposed at the output terminal of each column line is controlled to be turned off by the control signal input through the control signal input terminal, so that the output terminal of each column line is not directly grounded, wherein the MOS transistor disposed at the output terminal of each column line is connected to each column line, the output terminal of each column line, and the control signal.
Optionally, when the MOS transistors connected to the row lines and the column lines, respectively, are turned on by the control signal input through the control signal input end, the MOS transistors disposed at the output end of each column line are controlled to be turned off by the control signal input through the control signal input end, so that the output end of each column line is not directly connected to the ground.
As shown in fig. 4, 6 and 7, a MOS transistor (e.g., an NMOS transistor or a PMOS transistor) which may be disposed at the output end of each column line is respectively connected to each column line, the output end of each column line and a control signal. It should be noted that, when the MOS transistor connected to the output end of each column line is an NMOS transistor, the other MOS transistor connected to the row line and the column line is a PMOS transistor; when the MOS tube connected with the output end of each column line is a PMOS tube, the other MOS tube connected with the row line and the column line is an NMOS tube.
Through the circuit connection manner shown in fig. 4, 6, and 7, when the PMOS transistor is turned on by the control signal Ctr, the NMOS is turned off (i.e., the data line will not be output any more), so as to avoid direct short-circuit of the OUT output; and when the Ctr closes the PMOS, the NMOS is opened, and the data line is normally charged.
Through this embodiment, after the ith row of LED lamps is opened, and before the ith +1 th row of LED lamps is opened, through the switch and the closure of control signal Ctr control MOS pipe, can directly be the same with all ranks voltages between two lines are opened for the electric charge on the parasitic capacitance obtains releasing, avoids the LED lamp to open the ghost phenomenon that causes unusually, has improved the display effect of LED display screen.
Optionally, in this embodiment, as an optional implementation manner, an LED display screen is further provided, 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; an input terminal for a control signal; and a display control circuit connected to an input end of the control signal, and connected to the row line in the LED display screen and the column line in the LED display screen, wherein the display control circuit is configured to control a voltage on the row line in the LED display screen to be equal to a voltage on the column line in the LED display screen through the control signal input by the input end of the control signal after display control of an i-th LED lamp in the plurality of rows of LED lamps is finished and before display control of an i + 1-th LED lamp in the LED display screen is started, the voltages on the row line and the column line are voltages of two stages of the plurality of rows of LED lamps, and i is a natural number.
In an alternative embodiment, as shown in fig. 4, the display control circuit includes: each row line in the LED display screen is respectively connected with the input end of the control signal through one MOS tube in the first group of MOS tubes, and each row line is connected together through the MOS tube connected with each row line; each column line in the LED display screen is respectively connected with the input end of the control signal through one MOS tube in the second group of MOS tubes, and the column lines are connected together through the MOS tube connected with the column lines; when the control signal is input at the input end of the control signal, the first group of MOS transistors and the second group of MOS transistors are turned on, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, wherein the target voltage is a ground voltage or a preset voltage greater than the ground voltage.
In an alternative embodiment, as shown in fig. 6, the display control circuit includes: each row line in the LED display screen is connected with the input end of the control signal through one MOS tube in the first group of MOS tubes, and each row line is connected with the same row line through the MOS tube connected with each row line; each column line in the LED display screen is respectively connected with the input end of the control signal through one MOS tube in the second group of MOS tubes, and the column lines are connected together through the MOS tube connected with the column lines; when the control signal is input to the input end of the control signal, the first group of MOS transistors and the second group of MOS transistors are turned on, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, where the target voltage is a ground voltage or a preset voltage greater than the ground voltage.
In an alternative embodiment, as shown in fig. 7, the display control circuit includes: each row line in the LED display screen is connected with the input end of the control signal through one MOS tube in the first group of MOS tubes, and each row line is connected together through the MOS tube connected with each row line; each column line in the LED display screen is respectively connected with the input end of the control signal through one MOS tube in the second group of MOS tubes, and each column line is connected with the same row line through the MOS tube connected with each column line; when the control signal is input at the input end of the control signal, the first group of MOS transistors and the second group of MOS transistors are turned on, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, wherein the target voltage is a ground voltage or a preset voltage greater than the ground voltage.
Optionally, the method further comprises: and a third group of MOS transistors, each of the MOS transistors of the third group of MOS transistors being respectively disposed at an output end of one of the column lines, each of the MOS transistors of the third group of MOS transistors being respectively connected to one of the column lines, an output end of the one of the column lines, and an input end of the control signal, wherein when the control signal is input at the input end of the control signal, the MOS transistors of the third group are turned off, so that the output end of each of the column lines is not directly grounded.
The following describes a display control method of the LED display screen with reference to an alternative example.
It should be noted that, as for the display control circuit of the LED display screen, reference may be made to the circuits shown in fig. 4, 6, and 7, where in the circuit shown in fig. 4, each row line is connected together by using a PMOS transistor or an NMOS transistor, each column line is also connected together by using a PMOS transistor or an NMOS transistor, then the column lines and the data lines are also connected together, and the opening and closing of the PMOS transistor and the NMOS transistor are controlled by using the control signal Ctr. FIG. 6 shows all rows connected to a column and all columns connected to a column; fig. 7 shows that all columns are connected to a certain row and all rows are connected to a row. The circuit timing charts of the circuits shown in fig. 4, 6, and 7 are all the circuit timing charts shown in fig. 5, and the positions of the grounds of the circuits shown in fig. 4, 6, and 7 may be a voltage set as needed.
The PMOS and the NMOS can be interchanged, and correspondingly, the high level and the low level of the Ctr signal are opposite.
The circuits shown in fig. 4, 6 and 7 can achieve the following technical effects:
1. improving lower ghost
As shown in fig. 2, if it is required to display that LED5/1 is on, LED2 is not on, and according to the original design, row (n) is turned on, OUTm +1 is pulled low, then LED5 is lit, but at the same time the voltage of the parasitic capacitance on OUTm +1 data line is also pulled low, because the LED1 needs to be lit, Row (n +1) needs to be turned on, and at this time, if the voltage of the parasitic capacitor on the data line OUTm +1 does not recover to a level (the voltage difference with the voltage on the Row line Row (n +1) is still greater than or equal to the threshold voltage of the LED 2), the LED2 will light up, but if the technical solution of the present invention is adopted, directly equalizing all Row and column voltages between the two rows of Row (n) and Row (n +1) are opened, so that the charges of the parasitic capacitances of the data lines are discharged, when Row (n +1) is opened, the LED2 is not triggered and lightened by mistake, thereby solving the ghost phenomenon and improving the display effect of the LED display screen.
2. Improving upper ghost
As shown in fig. 2, if the LED5/2 needs to be lit, according to the original design, Row (n) is turned on, and OUTm +1 is pulled low, then the LED5 is lit, but the parasitic capacitance on Row line Row (n) is also charged to a high voltage, if the charge is not completely released before the next Row is turned on, then the LED2 is lit while the LED5 is lit, but if the technical solution of the present invention is adopted, all Row and column voltages are directly the same between the two rows of Row (n) and Row (n +1) are turned on, the charge on the Row (n) parasitic capacitance is released, and when Row (n +1) is turned on, the LED5 is not triggered to be lit by mistake, so that the ghost phenomenon is solved, and the display effect of the LED display screen is improved.
According to another aspect of the embodiments of the present invention, there is also provided a display control apparatus for an LED display screen, as shown in fig. 8, the apparatus includes:
a first control unit 802, configured to control voltages of two stages of a plurality of rows of LED lamps to be equal after display control of an i-th row of LED lamps in an LED display screen is finished and before display control of an i + 1-th row of LED lamps in the LED display screen is started, where the LED display screen includes a plurality of rows of LED lamps, and i is a natural number;
a second control unit 804, configured to perform display control on the i +1 th row of LED lamps when the i +1 th row of LED lamps in the LED display screen is scanned.
Alternatively, the first control unit 802 may be configured to perform step S302, and the second control unit 804 may be configured to perform step S304.
Through the embodiment, for the LED display screen, the LED display screen includes a plurality of rows of LED lamps, in the process of performing display control on the LED lamps of the LED display screen, when the i-th row of LED lamps of the LED display screen is scanned, the display control is performed on the i-th row of LED lamps, after the display control on the i-th row of LED lamps is finished and before the display control on the i + 1-th row of LED lamps of the LED display screen is started, the voltages of two stages of the plurality of rows of LED lamps of the LED display screen are controlled to be equal, and when the i + 1-th row of LED lamps is scanned, the display control is performed on the i + 1-th row of LED lamps. Through the mode, the voltages of the two stages of the multi-row LED lamps of the LED display screen are controlled to be equal, so that the charges of the parasitic capacitors on the display control circuit corresponding to the LED display screen can be released, the LED lamps cannot be charged by the parasitic capacitors and are lightened to generate a ghost phenomenon, and the technical problem that the ghost phenomenon occurs when the LED display screen displays is solved.
As an optional technical solution, the first control unit includes:
and the control module is used for controlling the voltage on a row line in the LED display screen to be equal to the voltage on a column line in the LED display screen, wherein the voltage on the row line and the voltage on the column line are respectively the voltages of two stages of the plurality of rows of LED lamps.
As an optional technical solution, the control module is further configured to, under a condition that each row line in the LED display screen is connected to an input end of a control signal through an MOS transistor, the row lines are connected together through the MOS transistors connected to each row line, each column line in the LED display screen is connected to an input end of the control signal through an MOS transistor, and the column lines are connected together through the MOS transistors connected to each column line, the MOS tube connected with each row line and each column line respectively is opened by the control signal input by the input end of the control signal, so that the voltage on each of the row lines and the voltage on each of the column lines are equal to a target voltage, the target voltage is a ground voltage or a preset voltage greater than the ground voltage.
As an optional technical solution, the control module is further configured to, under a condition that each row line in the LED display screen is connected to an input end of a control signal through an MOS transistor, each row line is connected to the same column line through the MOS transistor connected to each row line, each column line in the LED display screen is connected to an input end of the control signal through an MOS transistor, and each column line is connected to the same column line through the MOS transistors connected to each column line, turn on the MOS transistors connected to each row line and each column line through the control signal input by the input end of the control signal, so that a voltage on each row line and a voltage on each column line are equal to a target voltage, where the target voltage is a ground voltage or a preset voltage greater than the ground voltage.
As an optional technical solution, the control module is further configured to connect each row line in the LED display screen with an input end of a control signal through an MOS transistor, connect each row line together through the MOS transistor connected to each row line, connect each column line in the LED display screen with the input end of the control signal through an MOS transistor, and open the MOS transistors connected to each row line and each column line through the MOS transistor connected to each column line under the condition that each column line is connected to the same row line through the MOS transistor connected to each column line, so that a voltage on each row line and a voltage on each column line are equal to a target voltage, where the target voltage is a ground voltage or a preset voltage greater than the ground voltage.
As an optional technical solution, the apparatus further includes: a third control unit, configured to control the MOS transistor disposed at the output end of each column line to be turned off through the control signal input by the control signal input end when the MOS transistor connected to each row line and each column line is turned on through the control signal input by the control signal input end, so that the output end of each column line is not directly connected to the ground, where the MOS transistor disposed at the output end of each column line is connected to each column line, the output end of each column line, and the control signal.
An embodiment of the present invention further provides a computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to perform the steps in any of the above 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 foregoing embodiments and exemplary implementations, 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 (4)

1. A display control method of an LED display screen is characterized by comprising the following steps:
after finishing display control on the ith row of LED lamps in an LED display screen and before starting display control on the (i +1) th row of LED lamps in the LED display screen, controlling the voltages of two stages of a plurality of rows of LED lamps to be equal, wherein the LED display screen comprises the plurality of rows of LED lamps, and i is a natural number;
when the (i +1) th line of LED lamps in the LED display screen are scanned, carrying out display control on the (i +1) th line of LED lamps;
wherein, the voltage of the two-stage of controlling multirow LED lamp is equal includes:
controlling the voltage on a row line in the LED display screen to be equal to the voltage on a column line in the LED display screen, wherein the voltage on the row line and the voltage on the column line are respectively the voltages of two stages of the LED lamps;
wherein the controlling the voltage on the row line in the LED display screen to be equal to the voltage on the column line in the LED display screen comprises:
under the condition that each row line in the LED display screen is connected with an input end of a control signal through an MOS tube, each row line is connected together through the MOS tube connected with each row line, each column line in the LED display screen is connected with an input end of the control signal through an MOS tube, and each column line is connected together through the MOS tube connected with each column line, the MOS tubes connected with each row line and each column line are opened through the control signal input by the input end of the control signal, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, wherein the target voltage is a grounding voltage or a preset voltage larger than the grounding voltage;
or, the controlling the voltage on the row line in the LED display screen to be equal to the voltage on the column line in the LED display screen includes:
under the condition that each row line in the LED display screen is connected with an input end of a control signal through an MOS tube, each row line is connected with the same column line through the MOS tube connected with each row line, each column line in the LED display screen is connected with an input end of the control signal through an MOS tube, and each column line is connected together through the MOS tube connected with each column line, the MOS tubes respectively connected with each row line and each column line are opened through the control signal input by the input end of the control signal, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, wherein the target voltage is a grounding voltage or a preset voltage larger than the grounding voltage;
or, the controlling the voltage on the row line in the LED display screen to be equal to the voltage on the column line in the LED display screen includes:
under the condition that each row line in the LED display screen is connected with an input end of a control signal through an MOS tube, each row line is connected together through the MOS tube connected with each row line, each column line in the LED display screen is connected with an input end of the control signal through an MOS tube, and each column line is connected with the same row line through the MOS tube connected with each column line, the MOS tubes connected with each row line and each column line are opened through the control signal input by the input end of the control signal, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, wherein the target voltage is a grounding voltage or a preset voltage greater than the grounding voltage.
2. The method of claim 1, wherein the method further comprises:
when the MOS tubes respectively connected with each row line and each column line are opened through the control signal input by the control signal input end, the MOS tubes arranged at the output end of each column line are controlled to be closed through the control signal input by the control signal input end, so that the output end of each column line is not directly grounded, wherein the MOS tubes arranged at the output end of each column line are respectively connected with each column line, the output end of each column line and the control signal.
3. An LED display screen, comprising:
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;
an input terminal for a control signal;
the display control circuit is connected with the input end of the control signal and is connected with the row lines in the LED display screen and the column lines in the LED display screen, wherein the display control circuit is used for controlling the voltage on the row lines in the LED display screen to be equal to the voltage on the column lines in the LED display screen through the control signal input by the input end of the control signal after the display control on the ith row of LED lamps in the plurality of rows of LED lamps is finished and before the display control on the (i +1) th row of LED lamps in the LED display screen is started, the voltages on the row lines and the column lines are the voltages of two stages of the plurality of rows of LED lamps respectively, and i is a natural number;
wherein the display control circuit includes:
each row line in the LED display screen is connected with the input end of the control signal through one MOS tube in the first group of MOS tubes, and each row line is connected together through the MOS tube connected with each row line;
each column line in the LED display screen is connected with the input end of the control signal through one MOS tube in the second group of MOS tubes, and the column lines are connected together through the MOS tube connected with the column lines;
when the control signal is input to the input end of the control signal, the first group of MOS tubes and the second group of MOS tubes are opened, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, wherein the target voltage is a ground voltage or a preset voltage which is greater than the ground voltage;
alternatively, the display control circuit includes:
each row line in the LED display screen is connected with the input end of the control signal through one MOS tube in the first group of MOS tubes, and each row line is connected with the same column line through the MOS tube connected with each row line;
each column line in the LED display screen is connected with the input end of the control signal through one MOS tube in the second group of MOS tubes, and the column lines are connected together through the MOS tube connected with the column lines;
when the control signal is input to the input end of the control signal, the first group of MOS tubes and the second group of MOS tubes are opened, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, wherein the target voltage is a ground voltage or a preset voltage which is greater than the ground voltage;
alternatively, the display control circuit includes:
each row line in the LED display screen is connected with the input end of the control signal through one MOS tube in the first group of MOS tubes respectively, and each row line is connected together through the MOS tube connected with each row line;
each column line in the LED display screen is connected with the input end of the control signal through one MOS tube in the second group of MOS tubes, and each column line is connected with the same row line through the MOS tube connected with each column line;
when the control signal is input to the input end of the control signal, the first group of MOS tubes and the second group of MOS tubes are opened, so that the voltage on each row line and the voltage on each column line are equal to a target voltage, wherein the target voltage is a ground voltage or a preset voltage greater than the ground voltage.
4. The LED display screen of claim 3, further comprising:
each MOS tube in the third group of MOS tubes is respectively arranged at the output end of one column line, each MOS tube in the third group of MOS tubes is respectively connected with one column line, the output end of one column line and the input end of the control signal, and when the input end of the control signal inputs the control signal, the MOS tubes in the third group are closed, so that the output end of each column line is not directly grounded.
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