CN116469342A - Control circuit and method of dot matrix LED display and display module - Google Patents

Abstract

The invention provides a control circuit and method of a dot matrix LED display and a display module, and relates to the technical field of displays. The control circuit of the dot matrix LED display comprises: a plurality of column driving circuits, a plurality of row scanning driving circuits, a voltage-controlled frequency modulation output circuit and a controller; the controller is respectively connected with one end of a plurality of columns of LEDs in the display through a plurality of column driving circuits; the controller is connected with the plurality of line scanning driving circuits through the voltage-controlled frequency modulation output circuit, so that the voltage-controlled frequency modulation output circuit outputs waveform signals with frequencies corresponding to the voltage signals to the plurality of line scanning driving circuits based on the voltage signals output by the controller; the plurality of line scan driving circuits are respectively connected with the other ends of the plurality of line LEDs in the display, so that the target line scan driving circuit provides a high-level signal to one end of the target line LEDs. The selective line scanning is realized without scanning line by line from top to bottom from the first line, and the local display refreshing frequency of the display is dynamically improved.

Description

Control circuit and method of dot matrix LED display and display module

Technical Field

The invention relates to the technical field of displays, in particular to a control circuit and method of a dot matrix LED display and a display module.

Background

An LED (Light Emitting Diode ) display is a display screen for displaying various information such as characters, graphics, moving pictures, etc. by controlling the display mode of semiconductor LEDs, and is a flat display screen composed of LED dot matrix modules or pixel units.

In the related art, for an LED display, a control circuit of a dot matrix LED display includes: the system comprises a column driving chip, a plurality of row scanning driving circuits and a singlechip, wherein the singlechip is respectively connected with a display and the row scanning driving circuits through the column driving chip, and each row scanning driving circuit is connected with a row of LEDs of the display; the single chip microcomputer respectively sends control signals to the column driving chips, sends pulse signals to the row scanning driving circuit, and sequentially lights the selected diodes in the first row, the selected diodes in the second row and the like from top to bottom.

However, in the related art, the entire display can be scanned sequentially from the top to the bottom of the first row, so that the flexibility of the scanning process is poor, and the problem of low refresh frequency of the display is easily caused.

Disclosure of Invention

The present invention is directed to a control circuit, a control method and a display module for a dot matrix LED display, which solve the above-mentioned problems in the related art.

In order to achieve the above purpose, the technical scheme adopted by the embodiment of the invention is as follows:

in a first aspect, an embodiment of the present invention provides a control circuit for a dot matrix LED display, including: a plurality of column driving circuits, a plurality of row scanning driving circuits, a voltage-controlled frequency modulation output circuit and a controller;

the controller is respectively connected with one ends of a plurality of columns of LEDs in the display through a plurality of column driving circuits;

the controller is connected with the plurality of line scanning driving circuits through the voltage-controlled frequency modulation output circuit, so that the voltage-controlled frequency modulation output circuit outputs waveform signals with frequencies corresponding to the voltage signals to the plurality of line scanning driving circuits based on the voltage signals output by the controller; the plurality of line scanning driving circuits are respectively connected with the other ends of the plurality of lines of LEDs in the display, so that the target line scanning driving circuit provides a high-level signal for one end of the target line of LEDs;

wherein different line scanning driving circuits have different band-pass filter center frequencies; the target line scanning driving circuit is as follows: and a plurality of line scanning driving circuits with band-pass filtering center frequency resonating with the frequency of the waveform signal, wherein the target line LED is: and the target line scanning driving circuit is connected with one line of LEDs.

Optionally, the line scan driving circuit includes: a band-pass filter circuit and a switch circuit; the band-pass filter center frequency of the band-pass filter circuit is the band-pass filter center frequency of the line scanning driving circuit; one end of the switching circuit is connected with a preset power supply, and the other end of the switching circuit is connected with the other end of the corresponding row of LEDs;

the voltage-controlled frequency modulation output circuit is connected with the input end of the band-pass filter circuit, and the output end of the band-pass filter circuit is connected with the control end of the switch circuit, so that after the waveform signal resonates with the band-pass filter center frequency of the band-pass filter circuit, one end and the other end of the switch circuit are controlled to be conducted.

Optionally, the line scan driving circuit further includes: a rectifying circuit; and the output end of the band-pass filter circuit is connected with the control end of the switch circuit through the rectifying circuit.

Optionally, the band-pass filter circuit includes: the first resistor, the first capacitor, the first operational amplifier, the second resistor, the third resistor and the second capacitor;

the first resistor is connected with the negative input end of the first operational amplifier through the first capacitor, the positive input end of the first operational amplifier is grounded, and the first resistor is grounded through the second resistor; the first resistor is also connected with the output end of the first operational amplifier through the second capacitor, the negative input end of the first operational amplifier is connected with the output end of the first operational amplifier through the third resistor, and the output end of the band-pass filter circuit is the output end of the first operational amplifier.

Optionally, the rectifying circuit includes: the third capacitor, the first diode, the second diode and the fourth capacitor;

the output end of the band-pass filter circuit is connected with the third capacitor, the third capacitor is connected with the cathode of the first diode, the anode of the diode is grounded, the third capacitor is also connected with the anode of the second diode, the cathode of the second diode is grounded through the fourth capacitor, and the cathode of the second diode is the output end of the rectifying circuit.

Optionally, the switching circuit includes: the bias end of the first switching tube is a control end of the switching circuit, one end of the first switching tube is connected with the preset power supply through the fourth resistor, and the other end of the first switching tube is grounded;

one end of the first switching tube is connected with the offset end of the second switching tube, one end of the second switching tube is connected with the preset power supply, and the other end of the second switching tube is connected with the other end of the corresponding row of LEDs.

Optionally, the first switch tube is an N-channel field effect tube, the bias end of the first switch tube is a gate of the N-channel field effect tube, one end of the first switch tube is a drain of the N-channel field effect tube, and the other end of the first switch tube is a source of the N-channel field effect tube;

The second switching tube is a P-channel field effect tube, the bias end of the second switching tube is the grid electrode of the P-channel field effect tube, one end of the second switching tube is the source electrode of the P-channel field effect tube, and the other end of the second switching tube is the drain electrode of the P-channel field effect tube.

Optionally, the voltage-controlled fm output circuit and the plurality of column driver circuits are integrated in a column driver chip.

In a second aspect, an embodiment of the present invention further provides a method for controlling a dot matrix LED display, which is applied to the controller in the control circuit of the dot matrix LED display in any one of the first aspect, where the method includes:

transmitting a control signal to a target column driver circuit of a plurality of column driver circuits to control a target column LED in a display to which the target column driver circuit is connected;

transmitting a voltage signal to a voltage-controlled frequency modulation output circuit, so that the voltage-controlled frequency modulation output circuit outputs waveform signals with frequencies corresponding to the voltage signals to a plurality of line scanning driving circuits based on the voltage signals, and a target line scanning driving circuit provides a high-level signal to one end of a target line LED;

wherein different line scanning driving circuits have different band-pass filter center frequencies; the target line scanning driving circuit is as follows: and a plurality of line scanning driving circuits with band-pass filtering center frequency resonating with the frequency of the waveform signal, wherein the target line LED is: and the target line scanning driving circuit is connected with one line of LEDs.

In a third aspect, an embodiment of the present invention further provides a display module, including: a display and control circuitry for a dot matrix LED display as described in any of the first aspects above;

a plurality of column driving circuits in a control circuit of the dot matrix LED display are respectively connected with one ends of a plurality of columns of LEDs in the display, and a plurality of row scanning driving circuits in the control circuit of the dot matrix LED display are respectively connected with the other ends of a plurality of rows of LEDs in the display.

The beneficial effects of the invention are as follows: the embodiment of the invention provides a control circuit of a dot matrix LED display, which comprises the following components: a plurality of column driving circuits, a plurality of row scanning driving circuits, a voltage-controlled frequency modulation output circuit and a controller; the controller is respectively connected with one end of a plurality of columns of LEDs in the display through a plurality of column driving circuits; the controller is connected with the plurality of line scanning driving circuits through the voltage-controlled frequency modulation output circuit, so that the voltage-controlled frequency modulation output circuit outputs waveform signals with frequencies corresponding to the voltage signals to the plurality of line scanning driving circuits based on the voltage signals output by the controller; the plurality of line scanning driving circuits are respectively connected with the other ends of the plurality of lines of LEDs in the display, so that the target line scanning driving circuit provides a high-level signal for one end of the target line of LEDs; wherein, different line scanning driving circuits have different band-pass filtering center frequencies; the target line scanning driving circuit is as follows: the band-pass filter center frequency in the plurality of line scan driving circuits resonates with the frequency of the waveform signal, and the target line LED is: and a row of LEDs connected with the target row scanning driving circuit. The voltage-controlled frequency modulation output circuit is adopted to output waveform signals with frequencies corresponding to the voltage signals to the plurality of line scanning driving circuits, so that the target line scanning driving circuit resonating with the frequencies of the waveform signals provides high-level signals for one end of the target line LED, line scanning from top to bottom is not needed from the first line, selective line scanning is realized, and the local display refresh frequency of the display is dynamically improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a control circuit of a dot matrix LED display according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a dot matrix LED display according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a portion of a control circuit of a dot matrix LED display according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a line scan driving circuit according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a line scan driving circuit according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a control circuit of a dot matrix LED display according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a voltage-controlled fm output circuit according to an embodiment of the present invention;

Fig. 8 is a schematic flow chart of a control method of a dot matrix LED display according to an embodiment of the present invention;

FIG. 9 is a time-frequency diagram of a line scan in the related art according to an embodiment of the present invention;

FIG. 10 is a time-frequency diagram of a line scan according to an embodiment of the present invention;

FIG. 11 is a time-frequency diagram of a line scan according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a controller according to an embodiment of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention.

Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

In the description of the present application, it should be noted that, if the terms "upper", "lower", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or an azimuth or the positional relationship that is commonly put when the product of the application is used, it is merely for convenience of description and simplification of the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application.

Furthermore, the terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise 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.

It should be noted that, without conflict, features in embodiments of the present application may be combined with each other.

In the related art, the whole display can only be scanned sequentially from top to bottom from the first row, the flexibility of the scanning process is poor, and the problem of low refresh frequency of the display is easily caused.

Aiming at the technical problems in the related art, the embodiment of the application provides a control circuit of a dot matrix LED display, a voltage-controlled frequency modulation output circuit outputs waveform signals with frequencies corresponding to the voltage signals to a plurality of line scanning driving circuits based on the voltage signals output by a controller, different line scanning driving circuits have different band-pass filtering center frequencies, a target line scanning driving circuit resonating with the frequencies of the waveform signals provides high-level signals to one end of the target line LED, and the control of the controller on a plurality of column driving circuits is combined to directly control some LEDs in the target line LED to emit light, so that the selective line scanning is realized without scanning line by line from the first line, namely, the selective line scanning is realized, and the local display refreshing frequency of the display is dynamically improved.

The following explains a control circuit of a dot matrix LED display provided in an embodiment of the present application.

Fig. 1 is a schematic structural diagram of a control circuit of a dot matrix LED display according to an embodiment of the present invention, as shown in fig. 1, the control circuit of the dot matrix LED display may include: a plurality of column driving circuits 101, a plurality of row scanning driving circuits 102, a voltage-controlled frequency modulation output circuit 103, and a controller 104;

the controller 104 is connected to one end of the plurality of columns of LEDs in the display 105 through the plurality of column driving circuits 101. The display 105 may be a dot matrix LED display.

In addition, the controller 104 is connected to the plurality of line scan driving circuits 102 through the voltage-controlled fm output circuit 103, so that the voltage-controlled fm output circuit 103 outputs waveform signals of frequencies corresponding to the voltage signals to the plurality of line scan driving circuits 102 based on the voltage signals output by the controller 104; the plurality of line scan driving circuits 102 are respectively connected to the other ends of the plurality of line LEDs in the display 105, so that the target line scan driving circuit 102 supplies a high level signal to one end of the target line LED;

wherein, different line scan driving circuits 102 have different bandpass filter center frequencies; the target line scan driving circuit 102 is: the line scan driving circuits 102 with the center frequency of the band pass filter resonating with the frequency of the waveform signal in the plurality of line scan driving circuits 102, the target line LED is: a row of LEDs connected to the target row scan drive circuit 102.

In some embodiments, the controller 104 sends a voltage signal to the voltage controlled fm output circuit 103; the voltage-controlled fm output circuit 103 may receive the voltage signal and output waveform signals of frequencies corresponding to the voltage signal to the plurality of row scan driving circuits 102; the plurality of line scan driving circuits 102 may receive the waveform signal, and a center frequency of band pass filtering in a target line scan driving circuit 102 of the plurality of line scan driving circuits 102 resonates with a frequency of the waveform signal, so that the target line scan driving circuit 102 may provide a high-level signal to one end of the target line LED, thereby realizing scanning from the target line LED.

In addition, the controller 104 may also send a control signal to the target column driving circuit 101 among the plurality of column driving circuits 101 to control the target column LED, the row scanning driving circuit 102 to which one LED is connected outputs a high level, and the column scanning driving circuit to which the connected LED outputs a low level, and the LED is turned on.

Fig. 2 is a schematic structural diagram of a dot matrix LED display according to an embodiment of the present invention, as shown in fig. 2, the display 105 may include a plurality of rows of LEDs and a plurality of columns of LEDs, where each row of LEDs is connected to a row scan driving circuit 102, and each column of LEDs is connected to a column scan driving circuit. In addition, only 8 rows of LEDs and 8 columns of LEDs are shown, and it should be understood that this is only an example, and the number of rows and columns of LEDs in the display 105 is not particularly limited in the embodiments of the present application.

For example, for one LED of the 2 nd row and the 1 st column, if the row scanning driving circuit 102 to which the 2 nd row LED is connected transmits a high level signal to the 2 nd row LED and the column scanning circuit to which the 1 st column LED is connected transmits a low level signal to the 1 st column LED, the one LED of the 2 nd row and the 1 st column emits light.

It should be noted that, the voltage signal may be a signal within a preset voltage range, for example, the preset voltage range may be 0-3.3V (V), and after the voltage signals with different voltage ranges are input into the voltage-controlled fm output circuit 103, the voltage-controlled fm output circuit 103 may output waveform signals with different frequencies, where the frequency of the waveform signals may be between 1 mhz and 3 mhz.

Accordingly, different line scan driving circuits 102 have different bandpass filter center frequencies, and for example, the bandpass filter center frequencies of every two line scan driving circuits 102 are separated by 1 khz, so that a display screen of 2000 lines can be driven, and the bandpass filter center frequencies of 2000 driving circuits can be respectively adjusted as follows: 1.001 MHz, 1.002 MHz, 1.003 MHz, … … 2.999 MHz, 3.000 MHz.

In summary, an embodiment of the present invention provides a control circuit of a dot matrix LED display, including: a plurality of column driving circuits, a plurality of row scanning driving circuits, a voltage-controlled frequency modulation output circuit and a controller; the controller is respectively connected with one end of a plurality of columns of LEDs in the display through a plurality of column driving circuits; the controller is connected with the plurality of line scanning driving circuits through the voltage-controlled frequency modulation output circuit, so that the voltage-controlled frequency modulation output circuit outputs waveform signals with frequencies corresponding to the voltage signals to the plurality of line scanning driving circuits based on the voltage signals output by the controller; the plurality of line scanning driving circuits are respectively connected with the other ends of the plurality of lines of LEDs in the display, so that the target line scanning driving circuit provides a high-level signal for one end of the target line of LEDs; wherein, different line scanning driving circuits have different band-pass filtering center frequencies; the target line scanning driving circuit is as follows: the band-pass filter center frequency in the plurality of line scan driving circuits resonates with the frequency of the waveform signal, and the target line LED is: and a row of LEDs connected with the target row scanning driving circuit. The voltage-controlled frequency modulation output circuit is adopted to output waveform signals with frequencies corresponding to the voltage signals to the plurality of line scanning driving circuits, so that the target line scanning driving circuit resonating with the frequencies of the waveform signals provides high-level signals for one end of the target line LED, line scanning from top to bottom is not needed from the first line, selective line scanning is realized, and the local display refresh frequency of the display is dynamically improved.

Optionally, fig. 3 is a schematic diagram of a part of a control circuit of a dot matrix LED display according to an embodiment of the present invention, and as shown in fig. 3, a row scan driving circuit 102 includes: a band-pass filter circuit 1021 and a switch circuit 1022; the bandpass filter center frequency of the bandpass filter circuit 1021 is the bandpass filter center frequency of the line scan driving circuit 102; one end of the switch circuit 1022 is connected with a preset power supply, and the other end of the switch circuit 1022 is connected with the other end of the corresponding row of LEDs;

the voltage-controlled fm output circuit 103 is connected to an input terminal of the band-pass filter circuit 1021, and an output terminal of the band-pass filter circuit 1021 is connected to a control terminal of the switch circuit 1022, so that after the waveform signal resonates with a band-pass filter center frequency of the band-pass filter circuit 1021, one terminal and the other terminal of the switch circuit 1022 are controlled to be turned on.

In some embodiments, the voltage-controlled fm output circuit 103 outputs a waveform signal to the band-pass filter circuit 1021, and if the waveform signal resonates with the band-pass filter center frequency of the band-pass filter circuit 1021, the band-pass filter circuit 1021 outputs a target waveform to the control terminal of the switch circuit 1022, and the switch circuit 1022 controls one end and the other end of the switch circuit 1022 to be turned on according to the target waveform, and the other end of the switch circuit 1022 outputs a high-level signal to the other end of the corresponding row of LEDs.

It should be noted that, components with different parameters may be selected for the different band-pass filter circuits 1021, so that the different band-pass filter circuits 1021 have different band-pass filter center frequencies, and thus the different line scan driving circuits 102 have different band-pass filter center frequencies.

Optionally, fig. 4 is a schematic structural diagram of a line scan driving circuit according to an embodiment of the present invention, and as shown in fig. 4, the line scan driving circuit 102 further includes: a rectifier circuit 1023; an output terminal of the band-pass filter circuit 1021 is connected to a control terminal of the switching circuit 1022 through the rectifier circuit 1023.

In this embodiment of the present application, the band-pass filter circuit 1021 may output a target waveform to the rectifier circuit 1023, the rectifier circuit 1023 may perform rectifying and filtering processing on the target waveform, and output the rectified and filtered target waveform to the control end of the switch circuit 1022, and the switch circuit 1022 controls one end and the other end of the switch circuit 1022 to be turned on according to the rectified and filtered target waveform, and the other end of the switch circuit 1022 outputs a high-level signal to the other end of the LED corresponding to the row.

Optionally, fig. 5 is a schematic structural diagram of a line scan driving circuit according to an embodiment of the present invention, and as shown in fig. 5, a band-pass filter circuit 1021 includes: a first resistor R1, a first capacitor C1, a first operational amplifier Q1, a second resistor R2, a third resistor R3, and a second capacitor C2;

The first resistor R1 is connected with the negative input end of the first operational amplifier Q1 through a first capacitor C1, the positive input end of the first operational amplifier Q1 is grounded, and the first resistor R1 is grounded through a second resistor R2; the first resistor R1 is further connected to the output end of the first operational amplifier Q1 through the second capacitor C2, the negative input end of the first operational amplifier Q1 is connected to the output end of the first operational amplifier Q1 through the third resistor R3, and the output end of the band-pass filter circuit 1021 is the output end of the first operational amplifier Q1.

In this embodiment of the present application, the first resistor R1, the first capacitor C1, the second resistor R2, and the second capacitor C2 may form an RC (resistor capacitor) oscillating circuit, where the first resistor R1, the first capacitor C1, the second resistor R2, and the second capacitor C2 set different values, the band-pass filter circuit 1021 may obtain different band-pass filter center frequencies, and the values of the first resistor R1, the first capacitor C1, the second resistor R2, and the second capacitor C2 in the band-pass filter circuit 1021 of different row scan driving circuits 102 may be different. The bandpass filter center frequency may be between 1 mhz and 3 mhz, for example.

The first operational amplifier Q1 amplifies the target waveform and outputs the amplified target waveform to the rectified current.

Alternatively, as shown in fig. 5, the rectifier circuit 1023 includes: a third capacitor C3, a first diode D1, a second diode D2 and a fourth capacitor C4;

the output end of the band-pass filter circuit 1021 is connected with a third capacitor C3, the third capacitor C3 is connected with the cathode of the first diode D1, the anode of the diode is grounded, the third capacitor C3 is also connected with the anode of the second diode D2, the cathode of the second diode D2 is grounded through a fourth capacitor C4, and the cathode of the second diode D2 is the output end of the rectifier circuit 1023.

The rectifying circuit 1023 including the third capacitor C3, the first diode D1, the second diode D2, and the fourth capacitor C4 may perform rectifying and filtering processing on the target waveform output from the band-pass filter circuit 1021, and output the rectified and filtered target waveform to the control terminal of the switching circuit 1022.

Optionally, as shown in fig. 5, the switching circuit 1022 includes: the switching circuit comprises a first switching tube Q2, a second switching tube Q3 and a fourth resistor R4, wherein the bias end of the first switching tube Q2 is the control end of a switching circuit 1022, one end of the first switching tube Q2 is connected with a preset power supply through the fourth resistor R4, and the other end of the first switching tube Q2 is grounded;

one end of the first switching tube Q2 is connected with the bias end of the second switching tube Q3, one end of the second switching tube Q3 is connected with a preset power supply, and the other end of the second switching tube Q3 is connected with the other end of the corresponding row of LEDs.

The fourth resistor R4 is a load resistor.

In some embodiments, the rectifying circuit 1023 outputs the rectified and filtered target waveform to the bias end of the first switching tube Q2, and then one end of the first switching tube Q2 may output a signal to the bias end of the second switching tube Q3, so that the second switching tube Q3 is turned on, and since one end of the second switching tube Q3 is connected to a preset power supply, the other end of the second switching tube Q3 outputs a high level signal.

As shown in fig. 5, the switching circuit 1022 may further include: fifth resistor R5, sixth resistor R6, seventh resistor R7, eighth resistor R8. The negative electrode of the second diode D2 in the rectifying circuit 1023 is connected with the bias end of the first switching tube Q2 through a fifth resistor R5, the bias end of the first switching tube Q2 is grounded through a sixth resistor R6, one end of the first switching tube Q2 is connected with the bias end of the second switching tube Q3 through a seventh resistor R7, and the bias end of the second switching tube Q3 is connected with a preset power supply through an eighth resistor R8.

It should be noted that the fifth resistor R5 is a driving protection resistor of the first switching tube Q2, the seventh resistor R7 is a driving protection resistor of the second switching tube Q3, and the sixth resistor R6 and the eighth resistor R8 are bleeder resistors. In addition, it should be noted that, as shown in fig. 5, the preset power supply may be denoted as VCC.

Optionally, the first switching tube is an N-channel field effect tube, the bias end of the first switching tube is the gate of the N-channel field effect tube, one end of the first switching tube is the drain of the N-channel field effect tube, and the other end of the first switching tube is the source of the N-channel field effect tube;

the second switching tube is a P-channel field effect tube, the bias end of the second switching tube is the grid electrode of the P-channel field effect tube, one end of the second switching tube is the source electrode of the P-channel field effect tube, and the other end of the second switching tube is the drain electrode of the P-channel field effect tube.

Optionally, fig. 6 is a schematic structural diagram of a control circuit of a dot matrix LED display according to an embodiment of the present invention, as shown in fig. 6, the voltage-controlled fm output circuit 103 and the plurality of column driving circuits 101 are integrated in a column driving chip.

Optionally, fig. 7 is a schematic structural diagram of a voltage-controlled fm output circuit according to an embodiment of the present invention, and as shown in fig. 7, the voltage-controlled fm output circuit 103 includes: the voltage-controlled frequency modulation output circuit comprises: a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a fifth capacitor C5, a second operational amplifier Q4, a thirteenth resistor R13, a fourteenth resistor R14, a third operational amplifier Q5, a fifteenth resistor R15, and a transistor T1.

The controller 104 is connected with the fifth capacitor C5 through a ninth resistor R9, the fifth capacitor C5 is connected with the output end of the second operational amplifier Q4, the negative input end of the second operational amplifier Q4 is connected with the first end of the transistor T1 through an eleventh resistor R11, the controller 104 is also connected with the positive input end of the second operational amplifier Q4 through a tenth resistor R10, and the positive input end of the second operational amplifier Q4 is also grounded through a twelfth resistor R12;

the output end of the second operational amplifier Q4 is connected with the negative input end of the third operational amplifier Q5, the positive input end of the third operational amplifier Q5 is grounded through a thirteenth resistor R13, the output end of the third operational amplifier Q5 is connected with the positive input end of the third operational amplifier Q5 through a fourteenth resistor R14, the output end of the third operational amplifier Q5 is connected with the second end of the transistor T1 through a fifteenth resistor R15, the third end of the transistor T1 is grounded, and the output end of the third operational amplifier Q5 is connected with a plurality of row scanning driving circuits.

In this embodiment of the present application, the voltage-controlled fm output circuit 103 may be referred to as a VCO (Voltage Controlled Oscillator, voltage-controlled fm output circuit), the second operational amplifier Q4 may be used as an integrator, when the transistor T1 is in a conducting state, the current flowing from the ninth resistor R9 passes through the fet, the resistance of the tenth resistor R10 is common to the resistance of the ninth resistor R9, the voltage drop is the same, the current of the tenth resistor R10 is twice the current of the ninth resistor R9, and the additional current charges the fifth capacitor C5. The second operational amplifier Q4 provides a gradually increasing output voltage to provide the current.

In addition, when the transistor T1 is in an off state, the current flowing from the ninth resistor R9 is discharged through the fifth capacitor C5, so that the output voltage of the second operational amplifier Q4 drops, and the second operational amplifier Q4 may output a triangular wave.

The third operational amplifier Q5 operates as a schmitt trigger. The input of the third operational amplifier Q5 is a triangular wave, i.e. the output of the second operational amplifier Q4. If the input voltage of the third operational amplifier Q5 is higher than the threshold level, the output of the third operational amplifier Q5 will be high. If the input voltage of the third operational amplifier Q5 is below the threshold level, the output of the third operational amplifier Q5 will be zero. Therefore, the third operational amplifier Q5 outputs a square wave.

In the embodiment of the present application, when the input voltage signals are different, the voltage-controlled fm output circuit 103 outputs square waves with different frequencies, i.e., waveform signals with different frequencies.

The embodiment of the application provides a control method of a dot matrix LED display, which is applied to a controller in a control circuit of the dot matrix LED display, and the control method of the dot matrix LED display provided by the embodiment of the application is explained below.

Optionally, fig. 8 is a flow chart of a control method of a dot matrix LED display according to an embodiment of the present invention, as shown in fig. 8, where the method includes:

s101, sending a control signal to a target column driving circuit in the plurality of column driving circuits to control a target column LED in a display connected with the target column driving circuit.

S102, sending a voltage signal to the voltage-controlled frequency modulation output circuit, so that the voltage-controlled frequency modulation output circuit outputs waveform signals with frequencies corresponding to the voltage signals to the plurality of line scanning driving circuits based on the voltage signals, and the target line scanning driving circuit provides a high-level signal to one end of the target line LED;

wherein, different line scanning driving circuits have different band-pass filtering center frequencies; the target line scanning driving circuit is as follows: the band-pass filter center frequency in the plurality of line scan driving circuits resonates with the frequency of the waveform signal, and the target line LED is: and a row of LEDs connected with the target row scanning driving circuit.

It should be noted that, for the specific implementation process of S101 and S102, reference may be made to the description related to the control circuit of the above-mentioned dot matrix LED display, which is not described herein again.

In summary, the embodiment of the application provides a control method of a dot matrix LED display, which includes: transmitting a control signal to a target column driver circuit of the plurality of column driver circuits to control a target column LED in a display to which the target column driver circuit is connected; transmitting a voltage signal to the voltage-controlled frequency modulation output circuit, so that the voltage-controlled frequency modulation output circuit outputs waveform signals with frequencies corresponding to the voltage signals to the plurality of line scanning driving circuits based on the voltage signals, and the target line scanning driving circuit provides a high-level signal to one end of the target line LED; wherein, different line scanning driving circuits have different band-pass filtering center frequencies; the target line scanning driving circuit is as follows: the band-pass filter center frequency in the plurality of line scan driving circuits resonates with the frequency of the waveform signal, and the target line LED is: and a row of LEDs connected with the target row scanning driving circuit. The controller is adopted to output voltage signals to the voltage-controlled frequency modulation output circuit, so that the voltage-controlled frequency modulation output circuit outputs waveform signals with frequencies corresponding to the voltage signals to the plurality of line scanning driving circuits, the target line scanning driving circuit resonating with the frequencies of the waveform signals provides high-level signals for one end of the target line LED, line scanning from top to bottom is not needed from the first line, selective line scanning is realized, namely selective line scanning is realized, and the local display refresh frequency of the display is dynamically improved.

Fig. 9 is a time-frequency diagram of a line scan in the related art according to an embodiment of the present invention, as shown in fig. 9, in which the horizontal axis represents time T (S, seconds) and the vertical axis represents modulation frequency F (M), the control voltage output scans from low to high once in a period of displaying one frame.

Fig. 10 is a schematic time-frequency diagram of a line scan according to an embodiment of the present invention, as shown in fig. 10, in less than one frame, the controller controls a small-segment voltage signal output to repeat a frequency (waveform signal) within a small-segment range, so as to implement local fast scan, where the horizontal axis represents time T (S, seconds) and the vertical axis represents modulation frequency F (M).

Fig. 11 is a schematic time-frequency diagram of a line scan according to an embodiment of the present invention, and as shown in fig. 11, the controller controls the output of the segment voltage signal to realize the segment output of the frequency (waveform signal). Thereby realizing the segment scanning. In this case, the horizontal axis represents time T (S, seconds), and the vertical axis represents modulation frequency F (M).

From the above, the embodiment of the application realizes local line scanning and selective segmented line scanning, and dynamically improves the refresh frequency of local display. The motion consistency and the motion fineness of the moving part of the LED display are improved.

The embodiment of the application provides a control device of a display, which is applied to a controller in a control circuit of a dot-matrix LED display, and comprises:

a transmitting module, configured to transmit a control signal to a target column driving circuit of the plurality of column driving circuits, so as to control a target column LED in a display connected to the target column driving circuit; transmitting a voltage signal to the voltage-controlled frequency modulation output circuit, so that the voltage-controlled frequency modulation output circuit outputs waveform signals with frequencies corresponding to the voltage signals to the plurality of line scanning driving circuits based on the voltage signals, and the target line scanning driving circuit provides a high-level signal to one end of the target line LED; wherein, different line scanning driving circuits have different band-pass filtering center frequencies; the target line scanning driving circuit is as follows: the band-pass filter center frequency in the plurality of line scan driving circuits resonates with the frequency of the waveform signal, and the target line LED is: and a row of LEDs connected with the target row scanning driving circuit.

The embodiment of the application provides a display module, which comprises: the display and the control circuit of the dot matrix LED display;

the array LED display comprises a control circuit, a plurality of column driving circuits and a plurality of row scanning driving circuits, wherein the plurality of column driving circuits in the control circuit of the array LED display are respectively connected with one end of a plurality of columns of LEDs in the display, and the plurality of row scanning driving circuits in the control circuit of the array LED display are respectively connected with the other end of a plurality of rows of LEDs in the display.

In addition, the display is a dot matrix LED display.

An embodiment of the present application provides a display device, including: the display module and the preset power supply are arranged. For example, the display device may be a smart phone, a tablet computer, a notebook computer, or the like, which is not particularly limited in the embodiments of the present application.

The foregoing apparatus is used for executing the method provided in the foregoing embodiment, and its implementation principle and technical effects are similar, and are not described herein again.

The above modules may be one or more integrated circuits configured to implement the above methods, for example: one or more application specific integrated circuits (Application Specific Integrated Circuit, abbreviated as ASIC), or one or more microprocessors (digital singnal processor, abbreviated as DSP), or one or more field programmable gate arrays (Field Programmable Gate Array, abbreviated as FPGA), or the like. For another example, when a module above is implemented in the form of a processing element scheduler code, the processing element may be a general-purpose processor, such as a central processing unit (Central Processing Unit, CPU) or other processor that may invoke the program code. For another example, the modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

Fig. 12 is a schematic structural diagram of a controller according to an embodiment of the present invention, as shown in fig. 12, where the controller includes: processor 1201, memory 1202.

The memory 1202 is used for storing a program, and the processor 1201 calls the program stored in the memory 1202 to execute the above method embodiment. The specific implementation manner and the technical effect are similar, and are not repeated here.

Optionally, the present invention also provides a program product, such as a computer readable storage medium, comprising a program for performing the above-described method embodiments when being executed by a processor.

In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.

The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (english: processor) to perform some of the steps of the methods according to the embodiments of the invention. And the aforementioned storage medium includes: u disk, mobile hard disk, read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A control circuit for a dot matrix LED display, comprising: a plurality of column driving circuits, a plurality of row scanning driving circuits, a voltage-controlled frequency modulation output circuit and a controller;

the controller is respectively connected with one ends of a plurality of columns of LEDs in the display through a plurality of column driving circuits;

the controller is connected with the plurality of line scanning driving circuits through the voltage-controlled frequency modulation output circuit, so that the voltage-controlled frequency modulation output circuit outputs waveform signals with frequencies corresponding to the voltage signals to the plurality of line scanning driving circuits based on the voltage signals output by the controller; the plurality of line scanning driving circuits are respectively connected with the other ends of the plurality of lines of LEDs in the display, so that the target line scanning driving circuit provides a high-level signal for one end of the target line of LEDs;

wherein different line scanning driving circuits have different band-pass filter center frequencies; the target line scanning driving circuit is as follows: and a plurality of line scanning driving circuits with band-pass filtering center frequency resonating with the frequency of the waveform signal, wherein the target line LED is: and the target line scanning driving circuit is connected with one line of LEDs.

2. The circuit of claim 1, wherein the row scan drive circuit comprises: a band-pass filter circuit and a switch circuit; the band-pass filter center frequency of the band-pass filter circuit is the band-pass filter center frequency of the line scanning driving circuit; one end of the switching circuit is connected with a preset power supply, and the other end of the switching circuit is connected with the other end of the corresponding row of LEDs;

the voltage-controlled frequency modulation output circuit is connected with the input end of the band-pass filter circuit, and the output end of the band-pass filter circuit is connected with the control end of the switch circuit, so that after the waveform signal resonates with the band-pass filter center frequency of the band-pass filter circuit, one end and the other end of the switch circuit are controlled to be conducted.

3. The circuit of claim 2, wherein the row scan drive circuit further comprises: a rectifying circuit; and the output end of the band-pass filter circuit is connected with the control end of the switch circuit through the rectifying circuit.

4. The circuit of claim 2, wherein the bandpass filter circuit comprises: the first resistor, the first capacitor, the first operational amplifier, the second resistor, the third resistor and the second capacitor;

The first resistor is connected with the negative input end of the first operational amplifier through the first capacitor, the positive input end of the first operational amplifier is grounded, and the first resistor is grounded through the second resistor; the first resistor is also connected with the output end of the first operational amplifier through the second capacitor, the negative input end of the first operational amplifier is connected with the output end of the first operational amplifier through the third resistor, and the output end of the band-pass filter circuit is the output end of the first operational amplifier.

5. A circuit according to claim 3, wherein the rectifying circuit comprises: the third capacitor, the first diode, the second diode and the fourth capacitor;

the output end of the band-pass filter circuit is connected with the third capacitor, the third capacitor is connected with the cathode of the first diode, the anode of the diode is grounded, the third capacitor is also connected with the anode of the second diode, the cathode of the second diode is grounded through the fourth capacitor, and the cathode of the second diode is the output end of the rectifying circuit.

6. The circuit of claim 2, wherein the switching circuit comprises: the bias end of the first switching tube is a control end of the switching circuit, one end of the first switching tube is connected with the preset power supply through the fourth resistor, and the other end of the first switching tube is grounded;

One end of the first switching tube is connected with the offset end of the second switching tube, one end of the second switching tube is connected with the preset power supply, and the other end of the second switching tube is connected with the other end of the corresponding row of LEDs.

7. The circuit of claim 6, wherein the first switching tube is an N-channel field effect tube, the bias end of the first switching tube is the gate of the N-channel field effect tube, one end of the first switching tube is the drain of the N-channel field effect tube, and the other end of the first switching tube is the source of the N-channel field effect tube;

the second switching tube is a P-channel field effect tube, the bias end of the second switching tube is the grid electrode of the P-channel field effect tube, one end of the second switching tube is the source electrode of the P-channel field effect tube, and the other end of the second switching tube is the drain electrode of the P-channel field effect tube.

8. The circuit of claim 1, wherein the voltage controlled fm output circuit and the plurality of column driver circuits are integrated in a column driver chip.

9. A method for controlling a dot matrix LED display, applied to the controller in the control circuit of the dot matrix LED display according to any one of claims 1 to 8, the method comprising:

Transmitting a control signal to a target column driver circuit of a plurality of column driver circuits to control a target column LED in a display to which the target column driver circuit is connected;

transmitting a voltage signal to a voltage-controlled frequency modulation output circuit, so that the voltage-controlled frequency modulation output circuit outputs waveform signals with frequencies corresponding to the voltage signals to a plurality of line scanning driving circuits based on the voltage signals, and a target line scanning driving circuit provides a high-level signal to one end of a target line LED;

wherein different line scanning driving circuits have different band-pass filter center frequencies; the target line scanning driving circuit is as follows: and a plurality of line scanning driving circuits with band-pass filtering center frequency resonating with the frequency of the waveform signal, wherein the target line LED is: and the target line scanning driving circuit is connected with one line of LEDs.

10. A display module, comprising: a display and a control circuit for a dot matrix LED display according to any of the preceding claims 1-8;

a plurality of column driving circuits in a control circuit of the dot matrix LED display are respectively connected with one ends of a plurality of columns of LEDs in the display, and a plurality of row scanning driving circuits in the control circuit of the dot matrix LED display are respectively connected with the other ends of a plurality of rows of LEDs in the display.