CN113450727B - Driving circuit and driving method of display device - Google Patents
Driving circuit and driving method of display device Download PDFInfo
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- CN113450727B CN113450727B CN202110709035.2A CN202110709035A CN113450727B CN 113450727 B CN113450727 B CN 113450727B CN 202110709035 A CN202110709035 A CN 202110709035A CN 113450727 B CN113450727 B CN 113450727B
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- driving circuit
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/3406—Control of illumination source
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
Abstract
The invention provides a driving circuit and a driving method of a display device, wherein the driving circuit comprises: the backlight driving circuit comprises a system end, a time sequence control integrated circuit, a control module and a backlight driving circuit, wherein the control module is respectively coupled with the system end and the time sequence control integrated circuit; the system end is used for outputting a backlight enabling signal; the control module is used for controlling the time sequence control integrated circuit to output a backlight control signal to the backlight driving circuit according to the backlight enabling signal so that the time sequence control integrated circuit is in communication connection with the backlight driving circuit through the SPI; the backlight driving circuit is used for controlling the micro light-emitting diode units in the corresponding area of the display device to light according to the backlight control signal. The technical problem that the backlight cannot be lightened is solved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a driving circuit and a driving method for a display device.
Background
In order to meet the Video Electronics Standards Association (VESA) specification, in the power-on process of the conventional display device, the timing sequence adopted by the driving system is that after the backlight driving circuit (LED Driver) is powered on, the timing sequence control integrated circuit (TCON) is powered on, and then the backlight enable signal is turned on. Since the TCON can send the backlight control signal to the LED Driver after being electrified, and the backlight enabling signal is not started at the moment, the backlight cannot be lightened, and the phenomenon of black screen occurs.
Disclosure of Invention
The invention provides a driving circuit and a driving method of a display device, which are used for avoiding the technical problem that backlight cannot be lightened.
In a first aspect, an embodiment of the present invention provides a driving circuit for a display device, including:
the backlight driving circuit comprises a system end, a time sequence control integrated circuit, a control module and a backlight driving circuit, wherein the control module is respectively coupled with the system end and the time sequence control integrated circuit; wherein the content of the first and second substances,
the system end is used for outputting a backlight enabling signal;
the control module is used for controlling the time sequence control integrated circuit to output a backlight control signal to the backlight driving circuit according to the backlight enabling signal so that the time sequence control integrated circuit is in communication connection with the backlight driving circuit through the SPI;
the backlight driving circuit is used for controlling the micro light-emitting diode units in the corresponding area of the display device to light according to the backlight control signal.
In one possible implementation, the control module is independently arranged outside the sequential control integrated circuit;
the driving circuit further comprises a power management integrated circuit coupled with the control module and the sequential control integrated circuit respectively;
the system end is specifically configured to output the backlight enable signal to the control module and the backlight driving circuit respectively;
the control module is specifically used for converting the logic voltage output by the system end into a first voltage signal and outputting the first voltage signal to the power management integrated circuit under the control of the backlight enabling signal;
the power management integrated circuit is used for converting the first voltage signal into a second voltage signal and outputting the second voltage signal to the time sequence control integrated circuit;
the time sequence control integrated circuit is used for executing power-on work under the control of the second voltage signal.
In one possible implementation manner, the control module includes a MOS transistor and a triode coupled to the MOS transistor;
the first pole of the MOS tube is used for receiving the logic voltage output by the system end and is coupled with the system end, the second pole of the MOS tube is coupled with the power management integrated circuit, and the grid electrode of the MOS tube is coupled with the collector electrode of the triode;
the base electrode of the triode is used for receiving the backlight enabling signal and is coupled with the system end, and the emitting electrode of the triode is grounded;
when the backlight enabling signal is a rising edge, the grid electrode of the MOS tube is at a low potential, the MOS tube is conducted, and the logic voltage outputs the first voltage signal through the MOS tube.
In one possible implementation manner, the control module is a GPIO port, and the GPIO port is integrated in the timing control integrated circuit;
the system end is specifically used for outputting the backlight enabling signal to the time sequence control integrated circuit;
and the GPIO port is used for controlling the time sequence control integrated circuit to output the backlight control signal to the backlight driving circuit after detecting the rising edge of the backlight enabling signal, and controlling the time sequence control integrated circuit to be in communication connection with the backlight driving circuit through the SPI after delaying at least one frame of scanning duration.
In a possible implementation manner, the system end is further configured to output the backlight enable signal to the backlight driving circuit;
and the backlight driving circuit is used for controlling the micro light-emitting diode units in the corresponding area of the display device to light according to the backlight control signal after receiving the backlight control signal.
In a possible implementation manner, the timing control integrated circuit is further configured to output the backlight enable signal to the backlight driving circuit;
and the backlight driving circuit is used for controlling the micro light-emitting diode units in the corresponding area of the display device to emit light according to the backlight control signal after receiving the backlight enabling signal.
In a possible implementation manner, after the timing control integrated circuit is communicatively connected to the backlight driving circuit through the SPI, the timing control integrated circuit is configured to output a display control signal to the display device through the PHI interface, so that the display device performs display according to the display control signal.
In a second aspect, an embodiment of the present invention provides a driving method of a display device, including:
the system end outputs a backlight enabling signal;
the control module controls the time sequence control integrated circuit to output a backlight control signal to the backlight driving circuit according to the backlight enabling signal, so that the time sequence control integrated circuit is in communication connection with the backlight driving circuit through the SPI;
and the backlight driving circuit controls the micro light-emitting diode units in the corresponding area of the display device to light according to the backlight control signal.
In a possible implementation manner, the controlling module controls the timing control integrated circuit to output the backlight control signal to the backlight driving circuit according to the backlight enable signal, and includes:
the system end outputs the backlight enabling signal to the control module and the backlight driving circuit respectively;
under the control of the backlight enabling signal, the control module converts the logic voltage output by the system end into a first voltage signal and outputs the first voltage signal to a power management integrated circuit which is respectively coupled with the control module and the sequential control integrated circuit;
the power management integrated circuit converts the first voltage signal into a second voltage signal and outputs the second voltage signal to the time sequence control integrated circuit;
and the time sequence control integrated circuit executes power-on work under the control of the second voltage signal and outputs a backlight control signal to the backlight driving circuit.
In a possible implementation manner, the controlling module controls the timing control integrated circuit to output the backlight control signal to the backlight driving circuit according to the backlight enable signal, and includes:
a GPIO port integrated in the time sequence control integrated circuit receives the backlight enabling signal from the system end;
and after the GPIO port detects the rising edge of the backlight enabling signal, the timing control integrated circuit is controlled to output the backlight control signal to the backlight driving circuit, and after at least one frame of scanning time is delayed, the timing control integrated circuit is controlled to be in communication connection with the backlight driving circuit through the SPI.
In one possible implementation manner, the backlight driving circuit controls micro led units in corresponding areas of the display device to emit light according to the backlight control signal, and includes:
the backlight driving circuit receives the backlight enabling signal output by the system end;
and controlling the micro light-emitting diode units in the corresponding area of the display device to shine according to the backlight control signal.
In one possible implementation manner, the backlight driving circuit controls micro led units in corresponding areas of the display device to emit light according to the backlight control signal, and includes:
the backlight driving circuit receives the backlight enabling signal output by the time sequence control integrated circuit;
and controlling the micro light-emitting diode units in the corresponding area of the display device to light according to the backlight control signal.
In a possible implementation manner, after the control module controls the timing control integrated circuit to output the backlight control signal to the backlight driving circuit according to the backlight enable signal, the method further includes:
and the PHI interface integrated in the time sequence control integrated circuit outputs a display control signal to the display device so that the display device displays according to the display control signal.
The invention has the following beneficial effects:
the embodiment of the invention provides a driving circuit and a driving method of a display device, wherein the driving circuit comprises a system end, a time sequence control integrated circuit, a control module and a backlight driving circuit, the control module is respectively coupled with the system end and the time sequence control integrated circuit, the backlight driving circuit is coupled with the time sequence control integrated circuit, the system end outputs a backlight enabling signal, the control module receives the backlight enabling signal, and the control time sequence control integrated circuit outputs a backlight control signal to the backlight driving circuit.
Drawings
Fig. 1 is a schematic structural diagram of a driving circuit of a display device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a driving circuit of a display device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of one configuration of the control module of FIG. 2;
FIG. 4 is a schematic diagram of one configuration of the control module of FIG. 2;
fig. 5 is a schematic structural diagram of a driving circuit of a display device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a driving circuit of a display device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a driving circuit of a display device according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a driving circuit of a display device according to an embodiment of the present invention;
fig. 9 is a flowchart illustrating a method of driving a display device according to an embodiment of the present invention;
FIG. 10 is a flowchart of a method of the first implementation of step S102 of FIG. 9;
FIG. 11 is a flowchart of a method of the second implementation of step S102 in FIG. 9;
FIG. 12 is a flowchart of a method of the first control scheme of step S103 of FIG. 9;
fig. 13 is a method flowchart of the second control method of step S103 in fig. 9.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of the word "comprise" or "comprises", and the like, in the context of this application, is intended to mean that the elements or items listed before that word, in addition to those listed after that word, do not exclude other elements or items.
It should be noted that the sizes and shapes of the figures in the drawings are not to be considered true scale, but are merely intended to schematically illustrate the present invention. And like reference numerals refer to like or similar elements or elements having like or similar functions throughout.
In the related art, in the startup process of the display device, the driving timing sequence is usually LED Driver power-up- > TCON power-up- > backlight enable signal on, and when the display device adopts direct-down backlight, the brightness of the sub-area is controlled by TCON, and accordingly, the TCON and the LED Driver need to be connected through SPI communication. After TCON download flash, the TCON download flash will make code agreement with the LED Driver, that is, TCON will perform register setting. After the TCON is powered on, a backlight control signal can be sent to the LED Driver, and at the moment, the backlight enabling signal is not started, so that the LED Driver is in an abnormal working state, the LED Driver cannot communicate with the TCON, the backlight cannot be lightened, and a black screen phenomenon occurs.
In view of this, embodiments of the present invention provide a driving circuit and a driving method for a display device, so as to avoid the technical problem that a backlight cannot be turned on.
Fig. 1 is a schematic structural diagram of a driving circuit of a display device according to an embodiment of the present invention, where the driving circuit includes:
a system terminal 1, a time sequence control integrated circuit 2, a control module 3 respectively coupled with the system terminal 1 and the time sequence control integrated circuit 2, and a backlight driving circuit 4 coupled with the time sequence control integrated circuit 2; wherein the content of the first and second substances,
the system terminal 1 is used for outputting a backlight enable signal (LED _ EN);
the control module 3 is configured to control the timing control integrated circuit 2 to output a backlight control signal to the backlight driving circuit 4 according to the backlight enable signal (LED _ EN), so that the timing control integrated circuit 2 is in communication connection with the backlight driving circuit 4 through the SPI;
the backlight driving circuit 4 is used for controlling the micro light emitting diode units in the corresponding area of the display device to light according to the backlight control signal.
In the embodiment of the present invention, the display device may be a self-lighting type display device including Micro Light-Emitting diodes (Micro LEDs) such as Micro Light-Emitting diodes (Micro LEDs) and sub-millimeter Light-Emitting diodes (Mini LEDs), and accordingly, the display device has advantages of high brightness, low power consumption, high color gamut, and capability of realizing super high resolution display. Of course, in the specific implementation process, a person skilled in the art may select a corresponding display device according to the actual application requirement, which is not limited herein.
In a specific implementation process, the driving circuit includes a system terminal 1, a timing control integrated circuit 2, a control module 3 coupled to the system terminal 1 and the timing control integrated circuit 2, and a backlight driving circuit 4 coupled to the timing control integrated circuit 2, where the system terminal 1 may be a Central Processing Unit (CPU), and may output various signals required by the display device. The control module 3 may be independently disposed outside the timing control integrated circuit 2, or may be integrated in the timing control integrated circuit 2, and specifically, the control module 3 may be disposed according to actual application requirements, and fig. 1 illustrates a structure in which the control module 3 is independently disposed outside the timing control integrated circuit 2. The Timing control integrated circuit 2 may be a Timing Controller (TCON).
The system terminal 1 is configured to output a backlight enable signal (LED _ EN), so that the control module 3 can receive the backlight enable signal (LED _ EN) and control the timing control integrated circuit 2 to output a backlight control signal to the backlight driving circuit 4 according to the backlight enable signal (LED _ EN). That is, after the system end 1 turns on the backlight enable signal (LED _ EN), the control module 3 may control the timing control integrated circuit 2 to output a backlight control signal to the backlight driving circuit 4, and the timing control integrated circuit 2 is thereby communicatively connected to the backlight driving circuit 4 through a Serial Peripheral Interface (SPI). In this way, the backlight driving circuit 4 may control the Micro LED units in the corresponding area of the display device to emit light according to the backlight control signal, where the Micro LED units may be Micro LEDs or Mini LEDs, the number of the Micro LED units in the corresponding area of the display device may be one or multiple, and the area corresponding to the backlight driving circuit 4 may be determined according to the backlight partition of the display device, which is not limited herein, so that the backlight in the corresponding area of the display device is lit through the backlight control signal, thereby solving the technical problem that the backlight cannot be lit, and improving the display quality of the display device.
In the embodiment of the present invention, the control module 3 may be independently disposed outside the timing control integrated circuit 2, and as shown in fig. 2, the driving circuit is one of the structural schematic diagrams of the corresponding driving circuit, and the driving circuit further includes a power management integrated circuit 5 respectively coupled to the control module 3 and the timing control integrated circuit 2;
the system terminal 1 is specifically configured to output the backlight enable signal (LED _ EN) to the control module 3 and the backlight driving circuit 4, respectively;
the control module 3 is specifically configured to convert the logic voltage output by the system terminal 1 into a first voltage signal and output the first voltage signal to the power management integrated circuit 5 under the control of the backlight enable signal (LED _ EN);
the power management integrated circuit 5 is configured to convert the first voltage signal into a second voltage signal and output the second voltage signal to the timing control integrated circuit 2;
the timing control integrated circuit 2 is configured to perform a power-on operation under the control of the second voltage signal.
IN a specific implementation, as shown IN fig. 2, the Power Management ic 5 is coupled to the control module 3 and the timing control ic 2, respectively, the system terminal 1 can output the backlight enable signal (LED _ EN) to the control module 3 and the backlight driving Circuit 4, respectively, such that the control module 3 can convert the logic voltage (VDD _ IN) output by the system terminal 1 into a first voltage signal (VDD) and output the first voltage signal (VDD) to the Power Management ic 5 under the control of the backlight enable signal (LED _ EN) after receiving the backlight enable signal (LED _ EN), wherein the Power Management ic 5 can be a PMIC (Power Management Integrated Circuit), such that the Power Management ic 5 performs a Power-up operation under the control of the first voltage signal (VDD), the Power Management ic 5 can convert the first voltage signal (vcv) into a second voltage signal (v) and output the second voltage signal (v) to the timing control ic 2, and transmit the timing control signal (v) to the backlight driving Circuit 2, and transmit the timing control ic 2, and the backlight driving Circuit 2 can perform a backlight operation according to the timing control ic 2, and transmit the timing control signal (v) to the backlight driving Integrated Circuit 2, thereby realizing lighting of the corresponding backlight. In addition, after the sequential control integrated circuit 2 and the backlight driving circuit 4 are connected through SPI communication, the sequential control integrated circuit 2 may output a display control signal to the display device through a Packet processing Interface (PHI), so that the display device displays according to the display control signal, and since the sequential control integrated circuit 2 and the backlight driving circuit 4 are connected through SPI communication, the backlight driving circuit 4 may control the micro light emitting diode units in the corresponding region of the display device to emit light according to the backlight control signal, thereby ensuring synchronization of backlight and display, and further ensuring display quality of the display device.
In an embodiment of the present invention, as shown in fig. 3, which is a schematic structural diagram of the control module 3 in fig. 2, the control module 3 includes a MOS transistor 6 and a transistor 7 coupled to the MOS transistor 6;
a first pole of the MOS transistor 6 is configured to receive the logic voltage (VDD _ IN) output by the system terminal 1, and is coupled to the system terminal 1, a second pole of the MOS transistor 6 is coupled to the power management integrated circuit 5, and a gate of the MOS transistor 6 is coupled to a collector of the transistor 7;
the base electrode of the triode 7 is used for receiving the backlight enabling signal (LED _ EN) and is coupled with the system terminal 1, and the emitter electrode of the triode 7 is grounded;
when the backlight enable signal (LED _ EN) is a rising edge, the gate of the MOS transistor 6 is at a low potential, the MOS transistor 6 is turned on, and the logic voltage (VDD _ IN) outputs the first voltage signal via the MOS transistor 6.
In a specific implementation process, the Metal-Oxide-Semiconductor Field Effect Transistor (MOS) 6 may be a P-type MOS 6, when the backlight enable signal (LED _ EN) is a rising edge, the collector of the Transistor 7 is at a low potential, the gate of the MOS 6 is at a low potential, the MOS 6 is turned on, and the logic voltage output by the system terminal 1 outputs the first voltage signal (VDD) through the MOS 6, at this time, the control module 3 may output the first voltage signal (VDD) to the power management integrated circuit 5, and then the power management integrated circuit 5 converts the first voltage signal (VDD) into a second voltage signal (Vcore) and outputs the second voltage signal (Vcore) to the timing control integrated circuit 2, so that the timing control integrated circuit 2 performs power-up operation under the control of the second voltage signal (Vcore), and the timing control integrated circuit 2 may output the timing control signal to the backlight driving circuit 4, thereby displaying a corresponding backlight area.
When the backlight enable signal (LED _ EN) is a falling edge, the gate of the MOS transistor 6 is at a high potential, the MOS transistor 6 is turned off, the power management integrated circuit 5 cannot be powered on to operate, and accordingly, the timing control integrated circuit 2 is not powered on to operate, so that the backlight of the corresponding region of the display device is not lit. The voltage levels of the logic voltage (VDD _ IN) and the first voltage signal (VDD) may be 3.3V, and the voltage level of the second voltage signal (Vcore) may be 1.1V, but of course, the voltages of the logic voltage (VDD _ IN), the first voltage signal (VDD) and the second voltage signal (Vcore) may be set according to the actual application requirement, and are not limited herein. Through control module 3 is when guaranteeing backlight and demonstration synchronization, can realize the effective control to backlight, has improved display device's performance. In addition, the MOS transistor 6 may also be an N-type MOS transistor 6, and accordingly, the specific structure of the control module 3 will be different from that shown in fig. 3. Of course, those skilled in the art can select the corresponding MOS transistor 6 according to the actual application requirement, and the selection is not limited herein.
In addition, the control module 3 further includes a plurality of resistors and a plurality of capacitors, so as to ensure that the control module 3 outputs a backlight control signal to the backlight driving circuit 4 for the timing control integrated circuit 2. The setting of the resistors and capacitors in the control module 3 may be as shown in fig. 4, a first resistor (R1) is coupled between the gate of the MOS transistor 6 and the collector of the transistor 7, a first capacitor (C1) and a second resistor (R2) are coupled between the first pole and the gate of the MOS transistor 6, a second capacitor (C2) is coupled between the first pole of the MOS transistor 6 and the ground, a third capacitor (C3) is coupled between the second pole of the MOS transistor 6 and the ground, a third resistor (R3) and a fourth capacitor (C4) are coupled between the base and the emitter of the transistor 7, the emitter of the transistor 7 is coupled to the ground, and a fourth resistor (R4) is coupled between the system terminal and the base of the transistor 7.
In the specific implementation process, the control module 3 may be integrated in the power management integrated circuit 5, so as to ensure the integrated design of the driving circuit while realizing the control of the timing control integrated circuit 2 outputting the backlight control signal.
In the embodiment of the present invention, as shown in fig. 5, which is one of the structural schematic diagrams of the driving circuit, the control module 3 is a GPIO port 8, and the GPIO port 8 is integrated in the timing control integrated circuit 2;
the system terminal 1 is specifically configured to output the backlight enable signal (LED _ EN) to the timing control integrated circuit 2;
the GPIO port 8 is configured to control the timing control integrated circuit 2 to output the backlight control signal to the backlight driving circuit 4 after detecting a rising edge of the backlight enable signal (LED _ EN), and control the timing control integrated circuit 2 and the backlight driving circuit 4 to be in SPI communication connection after delaying at least one frame of scanning duration.
In a specific implementation process, the control module 3 may be a General Purpose Input Output (GPIO) port 8, and the GPIO port 8 is integrated in the timing control integrated circuit 2, so as to simplify a specific structure of the driving circuit. When GPIO port 8 is integrated in timing control integrated circuit 2, system end 1 can to timing control integrated circuit 2 outputs enable signal in a poor light (LED _ EN), GPIO can control timing control integrated circuit 2 outputs control signal in a poor light extremely behind the rising edge of the enable signal in a poor light (LED _ EN) of detecting drive circuit 4 in a poor light, and after delaying at least one frame of scanning duration, control timing control integrated circuit 2 with drive circuit 4 in a poor light passes through SPI communication connection, and at this moment, drive circuit 4 in a poor light can control little emitting diode unit in the display device corresponding region is according to control signal in a poor light shines to the technical problem that can't light in a poor light has been solved. In addition, after the time sequence control integrated circuit 2 delays at least one frame of scanning duration, the time sequence control integrated circuit 2 is in communication connection with the backlight driving circuit 4 through the SPI, and the time sequence control integrated circuit 2 transmits the backlight control signal to the backlight driving circuit 4, so that the micro light emitting diode units in the corresponding region of the display device are lighted according to the backlight control signal, and at this time, the time sequence control integrated circuit 2 can output a display control signal to the display device through the PHI interface 9, so that the display device displays according to the display control signal, thereby ensuring synchronization between backlight and display, and further ensuring display quality of the display device.
In the embodiment of the present invention, as shown in fig. 6, which is a schematic structural diagram of a driving circuit, the system terminal 1 is further configured to output the backlight enable signal (LED _ EN) to the backlight driving circuit 4;
the backlight driving circuit 4 is configured to control the micro led units in the corresponding area of the display device to illuminate according to the backlight control signal after receiving the backlight control signal.
In a specific implementation process, the system terminal 1 may output the backlight enable signal (LED _ EN) to the backlight driving circuit 4 while outputting the backlight enable signal (LED _ EN) to the timing control integrated circuit 2, and after the timing control integrated circuit 2 and the backlight driving circuit 4 are connected through SPI communication, the backlight driving circuit 4 may control the micro light emitting diode units in the corresponding area of the display device to emit light according to the backlight control signal after receiving the backlight control signal, thereby solving a technical problem that the backlight cannot be lit.
In the embodiment of the present invention, as shown in fig. 7, which is a schematic structural diagram of a driving circuit, the timing control integrated circuit 2 is further configured to output the backlight enable signal (LED _ EN) to the backlight driving circuit 4;
the backlight driving circuit 4 is configured to control the micro LED units in the corresponding area of the display device to emit light according to the backlight control signal after receiving the backlight enable signal (LED _ EN).
In a specific implementation process, after the timing control integrated circuit 2 receives the backlight enable signal (LED _ EN) output by the system terminal 1, the timing control integrated circuit 2 may further output the backlight enable signal (LED _ EN) to the backlight driving circuit 4, and after the timing control integrated circuit 2 is connected to the backlight driving circuit 4 through SPI communication, the backlight driving circuit 4 may control the micro light emitting diode units in the corresponding area of the display device to emit light according to the backlight control signal after receiving the backlight control signal, thereby solving the technical problem that the backlight cannot be lit.
In the embodiment of the present invention, as shown in fig. 8, which is a schematic structural diagram of a driving circuit, after the timing control integrated circuit 2 and the backlight driving circuit 4 are connected through SPI communication, the timing control integrated circuit 2 is configured to output a display control signal to the display device 10 through a PHI interface 9, so that the display device 10 performs display according to the display control signal.
In a specific implementation process, after the timing control integrated circuit 2 is in communication connection with the backlight driving circuit 4 through the SPI, and after the backlight driving circuit 4 receives the backlight enable signal (LED _ EN), the micro light emitting diode units in the corresponding region of the display device may be controlled to illuminate according to the backlight control signal, and at this time, the timing control integrated circuit 2 outputs a display control signal to the display device through the PHI interface 9, so that the display device displays according to the display control signal, thereby ensuring synchronization of backlight and display, and further ensuring display quality of the display device.
It should be noted that, for the driving circuits shown in fig. 6 to fig. 8, the driving circuit further includes the power management integrated circuit 5, and the power management integrated circuit 5 may convert the logic voltage output by the system terminal 1 into the voltage signal required by the timing control integrated circuit 2, so that the timing control integrated circuit 2 performs power-on operation.
Based on the same inventive concept, as shown in fig. 9, an embodiment of the present invention further provides a driving method of a display device, where the driving method is applied to the driving circuit, and a principle of the driving method to solve the problem is similar to that of the driving circuit, so that the implementation of the driving method of the display device can refer to the implementation of the driving circuit, and repeated details are not repeated.
As shown in fig. 9, the driving method of the display device includes:
s101: the system end outputs a backlight enabling signal;
s102: the control module controls the time sequence control integrated circuit to output a backlight control signal to the backlight driving circuit according to the backlight enabling signal, so that the time sequence control integrated circuit is in communication connection with the backlight driving circuit through the SPI;
s103: and the backlight driving circuit controls the micro light-emitting diode units in the corresponding area of the display device to light according to the backlight control signal.
In the embodiment of the present invention, the control module may implement the following two implementation manners but is not limited to implement the following two implementation manners for implementing the control of outputting the backlight control signal to the backlight driving circuit by the timing control integrated circuit according to the backlight enable signal. As shown in fig. 10, in the first implementation, step S102: the control module controls the sequential control integrated circuit to output a backlight control signal to the backlight driving circuit according to the backlight enabling signal, and the control module comprises:
s201: the system end outputs the backlight enabling signal to the control module and the backlight driving circuit respectively;
s202: under the control of the backlight enabling signal, the control module converts the logic voltage output by the system end into a first voltage signal and outputs the first voltage signal to a power management integrated circuit which is respectively coupled with the control module and the sequential control integrated circuit;
s203: the power management integrated circuit converts the first voltage signal into a second voltage signal and outputs the second voltage signal to the time sequence control integrated circuit;
s204: and the time sequence control integrated circuit executes power-on work under the control of the second voltage signal and outputs a backlight control signal to the backlight driving circuit.
In the embodiment of the present invention, as shown in fig. 11, which is a second implementation manner, correspondingly, step S102: the control module controls the sequential control integrated circuit to output a backlight control signal to the backlight driving circuit according to the backlight enabling signal, and the control module comprises:
s301: a GPIO port integrated in the time sequence control integrated circuit receives the backlight enabling signal from the system end;
s302: and after the GPIO port detects the rising edge of the backlight enabling signal, the timing control integrated circuit is controlled to output the backlight control signal to the backlight driving circuit, and after at least one frame of scanning duration is delayed, the timing control integrated circuit is controlled to be in communication connection with the backlight driving circuit through the SPI.
In the embodiment of the present invention, after the timing control integrated circuit is controlled to output the backlight control signal to the backlight driving circuit by using the second implementation manner as shown in fig. 11, the backlight driving circuit may have the following two control manners to control the micro led units in the corresponding area of the display device to illuminate according to the backlight control signal, and as shown in fig. 12, the first control manner is correspondingly executed, and step S103: the backlight driving circuit controls the micro light-emitting diode units in the corresponding area of the display device to emit light according to the backlight control signal, and the backlight driving circuit comprises:
s401: the backlight driving circuit receives the backlight enabling signal output by the system end;
s402: and controlling the micro light-emitting diode units in the corresponding area of the display device to shine according to the backlight control signal.
In the embodiment of the present invention, as shown in fig. 13, a second control manner is adopted, and accordingly, step S103: the backlight driving circuit controls the micro light-emitting diode units in the corresponding area of the display device to emit light according to the backlight control signal, and the backlight driving circuit comprises:
s501: the backlight driving circuit receives the backlight enabling signal output by the time sequence control integrated circuit;
s502: and controlling the micro light-emitting diode units in the corresponding area of the display device to light according to the backlight control signal.
In the embodiment of the present invention, in step S102: the control module controls the sequential control integrated circuit to output a backlight control signal to the backlight driving circuit according to the backlight enabling signal, and the method further comprises the following steps:
and the PHI interface integrated in the time sequence control integrated circuit outputs a display control signal to the display device so that the display device displays according to the display control signal.
The embodiment of the invention provides a driving circuit and a driving method of a display device, wherein the driving circuit comprises a system end, a time sequence control integrated circuit, a control module and a backlight driving circuit, the control module is respectively coupled with the system end and the time sequence control integrated circuit, the backlight driving circuit is coupled with the time sequence control integrated circuit, the system end outputs a backlight enabling signal, the control module receives the backlight enabling signal, and the control time sequence control integrated circuit outputs a backlight control signal to the backlight driving circuit.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (13)
1. A driving circuit of a display device, comprising:
the backlight driving circuit comprises a system end, a time sequence control integrated circuit, a control module and a backlight driving circuit, wherein the control module is respectively coupled with the system end and the time sequence control integrated circuit; wherein the content of the first and second substances,
in the starting process of the display device, the system end is used for outputting a backlight enabling signal;
the control module is used for controlling the time sequence control integrated circuit to output a backlight control signal to the backlight driving circuit according to the backlight enabling signal so that the time sequence control integrated circuit is in communication connection with the backlight driving circuit through the SPI;
the backlight driving circuit is used for controlling the micro light-emitting diode units in the corresponding area of the display device to light according to the backlight control signal.
2. The driving circuit of claim 1, wherein the control module is independently disposed outside the timing control integrated circuit;
the driving circuit further comprises a power management integrated circuit coupled with the control module and the sequential control integrated circuit respectively;
the system end is specifically configured to output the backlight enable signal to the control module and the backlight driving circuit respectively;
the control module is specifically used for converting the logic voltage output by the system end into a first voltage signal and outputting the first voltage signal to the power management integrated circuit under the control of the backlight enabling signal;
the power management integrated circuit is used for converting the first voltage signal into a second voltage signal and outputting the second voltage signal to the time sequence control integrated circuit;
the sequential control integrated circuit is used for executing power-on work under the control of the second voltage signal.
3. The driving circuit of claim 2, wherein the control module comprises a MOS transistor and a transistor coupled to the MOS transistor;
the first pole of the MOS tube is used for receiving the logic voltage output by the system end and is coupled with the system end, the second pole of the MOS tube is coupled with the power management integrated circuit, and the grid electrode of the MOS tube is coupled with the collector electrode of the triode;
the base electrode of the triode is used for receiving the backlight enabling signal and is coupled with the system end, and the emitting electrode of the triode is grounded;
when the backlight enable signal is a rising edge, the grid electrode of the MOS tube is a low potential, the MOS tube is conducted, and the logic voltage outputs the first voltage signal through the MOS tube.
4. The driving circuit of claim 1, wherein the control module is a GPIO port integrated within the timing control integrated circuit;
the system end is specifically used for outputting the backlight enabling signal to the time sequence control integrated circuit;
and the GPIO port is used for controlling the time sequence control integrated circuit to output the backlight control signal to the backlight driving circuit after detecting the rising edge of the backlight enabling signal, and controlling the time sequence control integrated circuit to be in communication connection with the backlight driving circuit through the SPI after delaying at least one frame of scanning duration.
5. The driving circuit of claim 4, wherein the system terminal is further configured to output the backlight enable signal to the backlight driving circuit;
and the backlight driving circuit is used for controlling the micro light-emitting diode units in the corresponding area of the display device to emit light according to the backlight control signal after receiving the backlight control signal.
6. The driving circuit of claim 4, wherein the timing control integrated circuit is further configured to output the backlight enable signal to the backlight driving circuit;
and the backlight driving circuit is used for controlling the micro light-emitting diode units in the corresponding area of the display device to light according to the backlight control signal after receiving the backlight enabling signal.
7. The driving circuit according to any one of claims 1 to 6, wherein after the timing control integrated circuit is communicatively connected to the backlight driving circuit via the SPI, the timing control integrated circuit is configured to output a display control signal to the display device via the PHI interface, so that the display device performs display according to the display control signal.
8. A method of driving a display device, comprising:
in the starting process of the display device, a system end outputs a backlight enabling signal;
the control module controls the time sequence control integrated circuit to output a backlight control signal to the backlight driving circuit according to the backlight enabling signal, so that the time sequence control integrated circuit is in communication connection with the backlight driving circuit through the SPI;
and the backlight driving circuit controls the micro light-emitting diode units in the corresponding area of the display device to light according to the backlight control signal.
9. The method of claim 8, wherein the controlling module controls the timing control integrated circuit to output a backlight control signal to the backlight driving circuit according to the backlight enable signal, comprising:
the system end outputs the backlight enabling signal to the control module and the backlight driving circuit respectively;
under the control of the backlight enabling signal, the control module converts the logic voltage output by the system end into a first voltage signal and outputs the first voltage signal to a power management integrated circuit which is respectively coupled with the control module and the sequential control integrated circuit;
the power management integrated circuit converts the first voltage signal into a second voltage signal and outputs the second voltage signal to the time sequence control integrated circuit;
and the time sequence control integrated circuit executes power-on work under the control of the second voltage signal and outputs a backlight control signal to the backlight driving circuit.
10. The method as claimed in claim 8, wherein the controlling module controls the timing control integrated circuit to output the backlight control signal to the backlight driving circuit according to the backlight enable signal, comprising:
a GPIO port integrated in the time sequence control integrated circuit receives the backlight enabling signal from the system end;
and after the GPIO port detects the rising edge of the backlight enabling signal, the timing control integrated circuit is controlled to output the backlight control signal to the backlight driving circuit, and after at least one frame of scanning time is delayed, the timing control integrated circuit is controlled to be in communication connection with the backlight driving circuit through the SPI.
11. The method of claim 10, wherein the backlight driving circuit controls the micro led units in the corresponding area of the display device to illuminate according to the backlight control signal, comprising:
the backlight driving circuit receives the backlight enabling signal output by the system end;
and controlling the micro light-emitting diode units in the corresponding area of the display device to shine according to the backlight control signal.
12. The method of claim 10, wherein the backlight driving circuit controls the micro light emitting diode units in the corresponding area of the display device to illuminate according to the backlight control signal, comprising:
the backlight driving circuit receives the backlight enabling signal output by the time sequence control integrated circuit;
and controlling the micro light-emitting diode units in the corresponding area of the display device to shine according to the backlight control signal.
13. The method of any one of claims 8-12, wherein after the control module controls the timing control integrated circuit to output the backlight control signal to the backlight driving circuit according to the backlight enable signal, the method further comprises:
and the PHI interface integrated in the time sequence control integrated circuit outputs a display control signal to the display device so that the display device displays according to the display control signal.
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