CN113129808A - Driving method and driving device of LED array and display device - Google Patents

Driving method and driving device of LED array and display device Download PDF

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CN113129808A
CN113129808A CN201911417776.2A CN201911417776A CN113129808A CN 113129808 A CN113129808 A CN 113129808A CN 201911417776 A CN201911417776 A CN 201911417776A CN 113129808 A CN113129808 A CN 113129808A
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led array
driving
signal
inputting
power supply
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CN113129808B (en
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蔡胜强
林智远
谢相伟
颜青青
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TCL Research America Inc
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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]

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Abstract

The embodiment of the application belongs to the technical field of driving, and provides a driving method, a driving device, a display device and a readable storage medium of an LED array, wherein the driving time of the LED array is divided through preset conditions to obtain a plurality of subfields with inconsistent time lengths; the control mode ensures that the addressing scanning times are not influenced by the minimum subfield, thereby increasing the scanning times, increasing the display gray scale number of the backlight and improving the display gray scale precision of the whole LED backlight.

Description

Driving method and driving device of LED array and display device
Technical Field
The embodiment of the application belongs to the technical field of driving, and particularly relates to a driving method, a driving device, a display device and a readable storage medium for an LED array.
Background
At present, the LED backlight Driving mode is mainly divided into Active Matrix Driving (AM) Driving and Passive Matrix Driving (PM) Driving, the AM Driving has stronger Driving capability relative to the PM Driving, the brightness uniformity and the contrast are better, the Driving power consumption is lower, the independent control is realized, and the advantage of higher resolution ratio can be realized.
One way of AM driving is by pulsingThe method comprises the steps of realizing multi-gray-scale control of an LED lamp by a PWM (Pulse Width Modulation) duty ratio control mode, controlling the lighting time of the LED lamp by outputting a PWM duty ratio control signal, realizing multi-gray-scale control by adopting a constant voltage power supply mode, specifically, dividing each frame of a display picture into subfields with different sizes according to scanning time, wherein the subfields are defined as independent time units which are divided in each frame and used for controlling each light source to be on or off, and the time lengths of the subfields are generally different. Therefore, each subfield is scanned and controlled to emit light at the same time, and the total light-emitting time of each subfield is combined to control the total light-emitting time, so that the light-on time of each display unit in the display panel is controlled, and the effect that each display unit has different gray scales is achieved. Let f be the refresh frequency, the duration of each frame be 1/f, and the duration of the kth sub-field be 1/2KFrame, total number of subfields K0Then the minimum sub-field time length is
Figure BDA0002351632940000011
According to the traditional driving mode, if one frame of picture is displayed, one-time scanning time of the LED array exceeds the minimum subfield, the LED array cannot be completely scanned and lightened in the minimum subfield, so that in order to avoid logic errors, only the scanning times can be reduced, and the gray scale precision is limited by the minimum subfield.
However, since the addressing and lighting of the LED lamp need to be completed in the same sub-field, the gray scale accuracy is limited by the minimum sub-field, and the gray scale control accuracy is not high.
Disclosure of Invention
Embodiments of the present application provide a driving method of an LED array, a driving device, a display device, and a readable storage medium, which aim to solve at least one of the above problems.
A first aspect of an embodiment of the present application provides a driving method for an LED array, where the driving method includes:
inputting a row scanning signal and a column data signal to the LED array respectively for addressing;
and introducing working voltage to the LED array to light the LED array, and stopping inputting the working voltage to the LED array if the duration of introducing the working voltage to the LED array reaches the corresponding lighting time length.
A second aspect of the embodiments of the present application provides a driving apparatus for an LED array, including:
the main control unit is used for inputting a row scanning signal and a column data signal to the LED array respectively so as to carry out addressing;
and the power supply control unit is used for introducing working voltage to the LED array to light the LED array after addressing is finished every time, and stopping inputting the working voltage to the LED array if the duration of introducing the working voltage to the LED array reaches the corresponding lighting time length.
A third aspect of embodiments of the present application provides a display device, including:
an array of LEDs; and
the driving unit is electrically connected with the LED array, and is used for driving the LED array to display a display picture according to any one of the driving methods; or
The driving unit comprises the driving device of the LED array.
The fourth aspect of the embodiments of the present application further provides a readable storage medium, which stores a computer program, and the computer program, when executed by a processor, implements the steps of the driving method according to any one of the above.
According to the LED array driving method, the LED array driving device, the LED array display device and the readable storage medium, the line scanning signals and the line data signals are respectively input to the LED array to be addressed through the preset rules, after the addressing is completed, the working voltage is input to the LED array to light the LED array, namely, the power supply does not supply power to the LED array when the addressing is completed, the LED array is supplied with power to light the corresponding LED after the addressing is completed, through the control mode, the addressing scanning times are not influenced by the minimum subfield in the display process of each frame of image, and the corresponding LED can be lighted after each addressing is completed, so that the scanning addressing times are increased, the backlight display gray scale number is increased, the display gray scale precision of the whole LED backlight is improved, and no logic errors are caused.
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In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1A is a schematic flow chart of a driving method provided in an embodiment of the present application;
fig. 1B is a schematic flow chart of a driving method according to another embodiment of the present application;
FIG. 2 is a flow chart of a method for dividing sub-fields in the embodiment of the present application;
FIG. 3 is a diagram of dividing the scanning and lighting time of each display unit in each frame of display screen into a plurality of driving times according to an embodiment of the present application;
fig. 4 is a block diagram of a driving apparatus of an LED array according to an embodiment of the present application;
fig. 5 is a block diagram of a driving apparatus of an LED array according to another embodiment of the present application;
FIG. 6 is a block diagram of a control module in the drive shown in FIG. 5;
FIG. 7 is a block diagram of a PWM power module in the driving apparatus shown in FIG. 5;
fig. 8 is an example circuit diagram of a switching circuit in the PWM power supply module shown in fig. 7;
fig. 9 is a circuit diagram of a DC/DC conversion circuit in the PWM power supply module shown in fig. 7;
fig. 10 is a signal input diagram of an LED backlight module according to an embodiment of the present application;
fig. 11 is an LED unit array diagram of an LED backlight module according to an embodiment of the present application;
fig. 12 is a circuit diagram of a line scanning module of an LED backlight module according to an embodiment of the present application;
fig. 13 is a circuit diagram of a column scanning module of an LED backlight module according to an embodiment of the present application;
fig. 14 is a lamp circuit diagram of each unit in an LED array of an LED backlight module according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this application and the drawings described above, are intended to cover non-exclusive inclusions. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.
The discrete electronic component in the embodiment of the present application refers to an electronic component that functions as an independent circuit and constitutes a basic unit of a circuit, for example, a resistor, a capacitor, an inductor, an electromechanical element (a connector, a switch, a relay, or the like), an electroacoustic device, an optoelectronic device, a sensitive component, a display device, a piezoelectric device, or the like.
The LED backlight module of the display panel comprises LED arrays arranged in an array, the LED arrays in the LED backlight module are scanned to drive the LED arrays to display pictures, and Active Matrix Pulse Width Modulation (AM-PWM) can realize Pulse Width Modulation of the light emitting arrays under the drive framework of the Active Matrix.
Fig. 1A is a driving method of an LED array according to an embodiment of the present application, and referring to fig. 1A, the driving method of the LED array in the embodiment includes:
step S20: row scan signals and column data signals are input to the LED array for addressing, respectively.
Step S40: and inputting working voltage to the LED array to light the LED array, and stopping inputting the working voltage to the LED array if the duration of inputting the working voltage to the LED array reaches the corresponding lighting time length.
In this embodiment, the address signal is output first and then the power signal is output. The power supply signal adopts a PWM power supply signal, and when the addressing signal is provided for the LED array, the power supply signal is not output or the output power supply signal is a low-level power supply signal, namely the LED array is not lightened during addressing; and after the addressing is finished, outputting a high-level power supply signal to light the LED which needs to be lighted in the LED array, and circulating the steps. Generally, whether the LED is lit or not is determined by the column data signal.
In this embodiment, when the row scanning signal and the column data signal are addressed, the power module of the LED array is controlled to be disconnected from the power end of the LED array, or the power module is controlled to input a low-level power signal to the connection end of the LED array; when addressing is finished, the lighting time of the LED array is entered, the power supply module of the LED array is controlled to input a power supply signal to the power supply terminal of the LED array to supply power to the LED, or the power supply module is controlled to convert an input low-level power supply signal into an input high-level power supply signal to the connecting terminal of the LED array, so that the addressing scanning frequency is not influenced by the minimum subfield in the display process of each frame image, and the corresponding LED can be lighted after each addressing is finished, thereby increasing the scanning frequency, increasing the display gray scale number of the backlight, improving the display gray scale precision of the whole LED backlight and not bringing logic errors.
Referring to fig. 1B, in a more specific embodiment, step S20 further includes step S10, obtaining information of the current frame, where the information includes a plurality of pieces of sub information, each piece of sub information corresponds to one sub-field, each sub-field is a sum of an addressing duration and a lighting duration, and the duration of inputting the operating voltage to the LED array is the lighting duration of the sub-field.
The information can be a frame of image data, the driving time of the frame of image is divided into N subfields, the frame of image data is divided into N sections, and then one subfield corresponds to one section of image data; the sub-fields are: the driving time of one frame of image is divided into a plurality of time periods, each time period corresponds to one subfield, and each subfield comprises an addressing time length and a lighting time length. In the embodiment of the present application, the addressing time duration of each subfield is the same, and the kth fieldiLighting time length of each subfield and kthi+1The ratio between the lighting periods of the sub-fields is 1/2, wherein k isiIndicating the K-th frame, the ith subfield.
In the embodiment, each subfield comprises addressing time with equal time length and lighting time for controlling the independent addressing of the LED array, and the lighting time of the LED arrays with different sizes divided in the driving time of each frame of image is controlled, so that the purpose of controlling the total lighting time of the LED arrays is achieved.
In an embodiment, referring to fig. 2, dividing the driving time of the current frame image to obtain a plurality of subfields with different time lengths, includes:
step S101, subtracting k0 addressing time lengths from the driving time of each frame of image to obtain residual time;
step S102, dividing the residual time length into k0 lighting time lengths according to the condition that the ratio of the lighting time length of the previous sub-field to the lighting time length of the next sub-field is 1/2, wherein each addressing time length corresponds to the lighting time length;
step S103, forming corresponding sub-fields based on each of the addressing durations and the corresponding lighting duration segments, and obtaining k0 sub-fields.
Wherein, the driving time of each frame of display picture is
Figure BDA0002351632940000061
Each addressing time is x, the time length of the on-off control time of the kth light source is
Figure BDA0002351632940000062
The time length of the kth sub-field is
Figure BDA0002351632940000063
k0 is an integer greater than or equal to 2, k is an integer less than or equal to k0, f is the refresh frequency, 2k0The number of gray levels is preset. In the embodiment of the application, the time length of the minimum subfield is
Figure BDA0002351632940000064
The complete addressing time and lighting time are included, so that the addressing and scanning times are not influenced by the minimum subfield in the display process of each frame of image, and the corresponding LED can be lighted after each addressing is finished, thereby increasing the scanning and addressing times.
In this embodiment, if the user wants to have the number of gray levels of the LED array reach 2k0Then, the driving time of the LED array driven by the address signal in each frame of the display screen is divided into k0 address times and k0 light source on/off control times, as shown in fig. 2, where k0 is 8.
Referring to fig. 4, the LED array includes at least one LED backlight module, the LED backlight module includes an LED array with LEDs arranged in an array, and the driving device includes a main control unit 10 and a power control unit 20.
The main control unit 10 inputs row scanning signals and column data signals to the LED array for addressing, respectively; the power control unit 20 is configured to input a working voltage to the LED array to light the LED array after each addressing is finished, and stop inputting the working voltage to the LED array if a duration of inputting the working voltage to the LED array reaches a corresponding lighting duration.
In this embodiment, when the main control unit 10 outputs a row scanning signal and a column data signal (addressing signal) for addressing, the power control unit 20 is controlled not to output a power signal or output a power signal of a low level, that is, the LED array is not lighted during addressing; when addressing is finished, light source lighting time is entered, then a high-level power supply signal is output to light the LED which needs to be lighted in the LED array, and through the control mode, the scanning times are not influenced by the addressing time, so that the scanning times are increased, the display gray scale number of the backlight of the display equipment is increased, and the display gray scale precision of the whole display backlight is improved.
Referring to fig. 5, in some embodiments, the main control unit 10 includes a control chip, the control chip receives the video signal, and the control chip is configured to analyze information of each frame of image in the video signal to obtain a row scanning signal and a column data signal. The control chip executes the driving method to input row scanning signals and column data signals to the LED array.
In some embodiments, the control chip is further configured to: inputting a row scanning signal and a column data signal to the LED array respectively for addressing; when the current addressing is finished, stopping inputting the row scanning signal and the column data signal to the LED array, and sending a power control signal of inputting the working voltage to the power control unit 20; and the control chip is also used for sending a power supply control signal for stopping inputting the working voltage to the power supply control unit 20 when the time length of inputting the working voltage to the LED array by the power supply control unit 20 reaches the lighting time length. The control chip outputs a power control signal to the power control unit 20 to make it output a voltage signal according to the control logic of the above-described driving method.
In this embodiment, the control chip is an FPGA (Field Programmable Gate Array); the video signal is input to the FPGA, and is processed by the FPGA control unit algorithm, and outputs a line scanning signal and a line data signal to the LED backlight module, and outputs a line SPI (Serial Peripheral Interface) data signal (i.e., a power control signal) to the power control unit 20. In other embodiments, the control chip is a DSP chip or the like.
Referring to fig. 5, in an embodiment, the power control unit 20 includes a control module 21 and a PWM power module 22, where the control module 21 is configured to generate a PWM control signal according to a power control signal; the PWM power module 22 is configured to generate a PWM power signal for driving the LED array to be turned on or off according to the PWM control signal.
The MCU control module 21 transmits the analyzed PWM control signal to the PWM power supply module 22, the PWM power supply module 22 outputs PWM power supply voltage with a certain duty ratio to the LED backlight module, and the LED lamp lighting time of the LED backlight module is controlled through the line scanning signal, the column data signal and the PWM power supply voltage with the certain duty ratio together, so that the gray scale of the LED lamp is controlled.
Referring to fig. 6, in an embodiment, the control module 21 includes an MCU 212 and a level shift chip 214, the MCU 212 generates a PWM control signal according to the power control signal, and the level shift chip 214 performs level shift on the PWM control signal and outputs the PWM control signal. The MCU 212 mainly receives an SPI signal (power control signal) output by the FPGA, processes the transmitted data, and outputs three lower-voltage PWM control signals, and outputs three higher-voltage PWM control signals after the three lower-voltage PWM control signals are converted into a higher-voltage level by a level shift chip, and then transmits the three higher-voltage PWM control signals to the PWM power module 22.
Referring to fig. 7, in one embodiment, the PWM power module 22 includes an AC/DC conversion circuit 221, a DC/DC conversion circuit 222, and a switch circuit 223. In a backlight system, there are at least 3 DC/DC conversion circuits 222 and switch circuits 223, or 3 times, and the 3 DC/DC conversion circuits 222 and switch circuits 223 respectively provide three paths of PWM power signals PWM _ Vr, PWM _ Vg, and PWM _ Vb for the three-color backlight light source.
Specifically, the AC/DC conversion circuit 221 is configured to convert an input alternating current into a first direct current; the DC/DC conversion circuit 222 is configured to perform voltage conversion on the first direct current to obtain a second direct current; the switching circuit 223 is connected to the second dc power for outputting a PWM power signal under the driving of the PWM control signal. Each DC/DC conversion circuit 222 converts each first direct current voltage into three second direct currents required by 3 types of red, green, and blue backlights, the 3 voltages are respectively connected to the 2 terminals of the three switch circuits 223, the 1 terminals of the three switch circuits 223 are respectively connected to the output terminal of the level conversion chip 214, and the PWM control signal output by the level conversion chip 214 controls the on/off of the three switch circuits 223, so that the 3 terminals of each switch circuit 223 output PWM power voltages PWM _ Vr, PWM _ Vg, and PWM _ Vb as shown in fig. 7, and transmit the power voltages to the LED backlight module.
Referring to fig. 8, in an embodiment, the switch circuit 223 includes a power switch E1 and a bleeding circuit 2232, a first conducting terminal of the power switch E1 is used for connecting the first direct current, a second conducting terminal of the power switch E1 is connected to a power terminal of the LED backlight module, one terminal of the bleeding circuit 2232 is connected to the second direct current, and the other terminal of the bleeding circuit 2232 is connected to a control terminal of the power switch E1. Optionally, the bleeder circuit 2232 includes a freewheeling diode D1 and an absorption resistor R1 connected in parallel to the freewheeling diode D1, and a cathode and an anode of the freewheeling diode D1 are sequentially used as one end and the other end of the bleeder circuit 2232.
Taking the switch circuit 223 providing the PWM power signal PWM _ Vr required for driving the red backlight as an example, the power switch E1 employs an NMOS transistor, the gate, the drain, and the source of the NMOS transistor are respectively the control terminal, the first conducting terminal, and the second conducting terminal of the power switch E1, the absorption resistor R1 is a small resistance resistor, the absorption resistor R1 inputs the PWM control signal 1 to the gate terminal of the NMOS transistor, the 2 terminal of the switch circuit 223 is connected to the drain terminal of the NMOS transistor, the second direct current provided by the DC/DC conversion circuit 222 is input, the source terminal of the NMOS transistor is connected to the 3 terminal of the switch circuit 223, when the gate terminal of the NMOS transistor inputs a high level voltage, the NMOS transistor is turned on, and the second direct current at the 2 terminal of the switch circuit 223 is input to the 3 terminal; when the grid end of the NMOS tube inputs low level voltage, the NMOS tube is turned off, the freewheeling diode D1 can discharge the internal capacitance of the NMOS tube quickly, and the turning-off of the NMOS tube is accelerated. The 3 ends of the switch circuit 223 respectively output PWM power supply signals PWM _ Vr, PWM _ Vg and PWM _ Vb by controlling the connection and disconnection of each NMOS tube in the switch circuit 223. In other embodiments, the power switch E1 may also be an IGBT or a transistor.
Referring to fig. 9, in one embodiment, the DC/DC converter circuit 222 includes a DC/DC chip 2222 and a sampling module 2224 connected between the output terminal and the feedback terminal of the DC/DC chip 2222.
The input voltage of the DC/DC chip 2222 in the DC/DC conversion circuit 222 is a voltage output by the AC/DC conversion circuit, which is higher than the first direct current, the output terminal of the DC/DC chip 2222 is connected to 2 resistors R2, R3 and a capacitor C1 to form a sampling module 2224, the feedback voltage of the DC/DC chip 2222 is the sampling voltage at two ends of the resistor R3, and the magnitude of the direct current voltage at two ends of the capacitor C1 is obtained according to the ratio of the resistors R2 and R3. The DC/DC chip 2222 adjusts the voltage of the output second direct current with a lower voltage to a desired voltage according to the magnitude of the sampling voltage.
Referring to fig. 10, a signal input diagram of the LED backlight module is shown, where the LED backlight module mainly includes a row scanning signal and a column data signal (i.e., an addressing signal) transmitted by the main control unit 10, and PWM power voltages PWM _ Vr, PWM _ Vg, and PWM _ Vb transmitted by the PWM power module 22, and the LED lamps of the LED backlight module are controlled to be turned on together.
Referring to fig. 11, in an embodiment, the LED lamps of the LED backlight module are arranged on the PCB lamp panel in a matrix form, each row is connected to the row scanning module in the main control unit 10, each column is connected to the column scanning module and the PWM power module 22 of the main control unit 10, the lighting of each LED lamp is controlled by the row scanning module, the column scanning module and the PWM power module 22, and each LED unit is connected as shown in fig. 11 to form a row-column array of the LED array.
Referring to fig. 12, in one embodiment, the line scan module includes a shift register and a buffer; the row signal input by the main control unit 10 mainly includes a row scanning signal and a row control signal, the row scanning signal is mainly input to the input end of the first shift register (e.g. 74HC595), the row control signal controls the output shift of each shift register, the buffer (e.g. 74HC125) enhances the driving current of the output signal of the shift register, and outputs a control signal with higher driving current.
Referring to fig. 13, in one embodiment, the column scan module includes a shift register and a buffer; the column signals input by the main control unit 10 mainly include column data signals and column control signals, the column data signals are mainly input to the input end of the first shift register (e.g., 74HC595), the column control signals control each shift register to output shift, the buffer (e.g., 74HC125) enhances the driving current of the output signals of the shift registers, outputs a control signal with higher driving current, and addresses the position of each LED lamp in fig. 9 through the combined action of the column and row signals.
Each LED lamp unit in the LED array of the LED backlight module mainly includes 3 circuits of a red lamp, a green lamp, and a blue lamp, for example, fig. 14 is a red lamp circuit in one embodiment, which includes 2 NMOS tubes, 1 capacitor, and 1 red LED lamp, and the gate terminal of the NMOS tube E2 is connected to the output terminal of the buffer of the line scanning module in fig. 11, and inputs a line scanning signal; the drain terminal of the NMOS tube E2 is connected to the output terminal of the column scan module buffer in fig. 12, and inputs column data signals, the source terminal of the NMOS tube E2 is connected to the capacitor C2 and the gate terminal of the NMOS tube E3, the drain terminal of the NMOS tube E3 is connected to the 3 terminal of the switch circuit of the PWM power module 22 in fig. 7 and 8, and inputs the PWM power voltage PWM _ Vr, and the capacitor C2 in the LED lamp circuit found during the addressing period in fig. 3 is charged, at this time, the PWM power voltage PWM _ Vr is at a low level, and after the addressing time is over, the capacitor C2 is charged, and enters a lighting time, at this time, the PWM power voltage PWM _ Vr is at a high level, the voltage in the capacitor C2 is gradually released, the conduction of the NMOS tube E3 is maintained, and the red LED. Thus, in a 1-frame picture (16.7 ms at 60 HZ), all the LED lamp units in fig. 11 are scanned in rows and columns, and in a 1-frame picture, when the number of rows and columns of all the LED lamp units in fig. 11 is increased, the total addressing time is increased, the LED lamp unit lighting time is decreased, and the number of rows and columns of all the LED lamp units in fig. 11 is increased, so that the display gray scale number of the LED lamp can be increased.
Embodiments of a third aspect of the present application provide a display device comprising:
an array of LEDs; and
the driving unit is electrically connected with the LED array, and is used for driving the LED array to display a display picture according to any one of the driving methods; or the driving unit comprises a driving arrangement of an LED array as described in any of the above.
The driving method, the driving device and the display device of the LED array provided by the embodiment of the application divide the driving time of the LED array through the preset conditions to obtain a plurality of sub-fields with inconsistent time lengths, wherein each sub-field comprises a corresponding addressing time length and a corresponding lighting time length, the addressing time lengths of the sub-fields are equal, namely, the power supply is controlled not to supply power to the light source when addressing is carried out, and the power supply is controlled to supply power to the light source when addressing is finished.
An embodiment of the application provides a readable storage medium, which stores a computer program that, when executed by a processor, implements the steps of the driving method according to any one of the above.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, a module or a unit may be divided into only one logical function, and may be implemented in other ways, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed 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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiments described above can be realized by a computer program, which can be stored in a computer readable storage medium and can realize the steps of the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, in accordance with legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunications signals.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (14)

1. A method of driving an LED array, the method comprising:
inputting a row scanning signal and a column data signal to the LED array respectively for addressing;
and inputting working voltage to the LED array to light the LED array, and stopping inputting the working voltage to the LED array if the duration of inputting the working voltage to the LED array reaches the corresponding lighting time length.
2. The driving method according to claim 1, wherein before the step of inputting row scanning signals and column data signals to the LED array for addressing, respectively, further comprising:
the method comprises the steps of obtaining information of a current frame, wherein the information comprises a plurality of pieces of sub information, each piece of sub information corresponds to one sub field, each sub field is the sum of addressing duration and lighting duration, and the duration of inputting working voltage to the LED array is the lighting duration of the sub field.
3. The driving method as claimed in claim 2, wherein, in the adjacent sub-fields, the k-th sub-fieldiLighting time length of each subfield and kthi+1The ratio between the lighting periods of the sub-fields is 1/2.
4. A driving apparatus of an LED array, comprising:
the main control unit is used for inputting a row scanning signal and a column data signal to the LED array respectively so as to carry out addressing;
and the power supply control unit is used for inputting working voltage to the LED array to light the LED array after addressing is finished every time, and stopping inputting the working voltage to the LED array if the duration of inputting the working voltage to the LED array reaches the corresponding lighting time length.
5. The driving apparatus as claimed in claim 4, wherein the main control unit comprises a control chip for receiving a video signal, and analyzing the information of each frame of image in the video signal to obtain a row scanning signal and a column data signal.
6. The drive of claim 5, wherein the control chip is further configured to: inputting a row scanning signal and a column data signal to the LED array respectively for addressing; when the current addressing is finished, stopping inputting a row scanning signal and a column data signal to the LED array, and sending a power supply control signal for inputting working voltage to the power supply control unit; and
and the LED lamp is also used for sending a power supply control signal for stopping inputting the working voltage to the power supply control unit when the time for the power supply control unit to input the working voltage to the LED array reaches the lighting time.
7. The drive device according to claim 6, wherein the power supply control unit includes:
the control module is used for generating a PWM control signal according to the power supply control signal; and
and the PWM power supply module is used for generating a PWM power supply signal for driving the LED array to be lightened or not lightened according to the PWM control signal.
8. The driving apparatus as claimed in claim 7, wherein the PWM power supply module comprises:
an AC/DC conversion circuit for converting an input alternating current into a first direct current;
the DC/DC conversion circuit is used for performing voltage conversion on the first direct current to obtain a second direct current; and
and the switching circuit is connected with the second direct current and is used for outputting a PWM power supply signal under the driving of the PWM control signal.
9. The driving apparatus as claimed in claim 8, wherein the switch circuit comprises a power switch and a bleeding circuit, a first conducting terminal of the power switch is used for accessing the first direct current, a second conducting terminal of the power switch is connected to the power terminal of the LED array, one terminal of the bleeding circuit is connected to the second direct current, and the other terminal of the bleeding circuit is connected to the control terminal of the power switch.
10. The driving apparatus as claimed in claim 9, wherein the bleeder circuit comprises a freewheeling diode and an absorption resistor connected in parallel with the freewheeling diode, and the negative pole and the positive pole of the freewheeling diode are sequentially used as one end and the other end of the bleeder circuit.
11. The driving apparatus as claimed in claim 9, wherein the DC/DC conversion circuit includes a DC/DC chip and a sampling module connected between an output terminal and a feedback terminal of the DC/DC chip.
12. The driving apparatus as claimed in claim 7, wherein the control module includes an MCU and a level shift chip, the MCU generates the PWM control signal according to the power control signal, and the level shift chip performs level shift on the PWM control signal and outputs the PWM control signal.
13. A display device, comprising:
an array of LEDs; and
a driving unit electrically connected to the LED array, wherein the driving unit is configured to drive the LED array according to the driving method of any one of claims 1 to 3; or
The driving unit comprises a driving device of the LED array according to any one of claims 4 to 12.
14. A readable storage medium, characterized in that the readable storage medium stores a computer program which, when executed by a processor, implements the steps of the driving method according to any one of claims 1 to 3.
CN201911417776.2A 2019-12-31 2019-12-31 Driving method and driving device of LED array and display device Active CN113129808B (en)

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