CN109637436B - Voltage stabilization control method, driving chip, L ED driving circuit and display device - Google Patents
Voltage stabilization control method, driving chip, L ED driving circuit and display device Download PDFInfo
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- CN109637436B CN109637436B CN201910074593.9A CN201910074593A CN109637436B CN 109637436 B CN109637436 B CN 109637436B CN 201910074593 A CN201910074593 A CN 201910074593A CN 109637436 B CN109637436 B CN 109637436B
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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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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
A port voltage stabilization control method of a driving circuit, a driving chip, an L ED driving circuit and a display device are provided, the port voltage stabilization control method comprises the steps of confirming whether each switch unit is in a closed state or an open state according to a logic control signal, detecting port voltage of a signal port connected with the switch unit in the open state, determining whether the signal port has an interference component according to a voltage value of the port voltage, and eliminating the interference component through a charging and discharging mode if the signal port has the interference component.
Description
Technical Field
The invention belongs to the technical field of circuit control, and particularly relates to a port voltage stabilization control method of a driving circuit, a driving chip, an L ED driving circuit and a display device.
Background
In the conventional technology, a driving circuit is generally adopted to generate a plurality of paths of control signals, and the working states of corresponding electronic circuits can be changed through the control signals; when the communication end of the driving circuit outputs different control signals, the electronic circuit is in different working states; in the actual control process of the electronic circuit, a plurality of communication ends of the driving circuit respectively output a plurality of paths of control signals in sequence, and along with different signal output states of each communication end, different electronic components in the electronic circuit are controlled by corresponding control signals to be in a state of power-on work or power-off stop; the electronic circuit realizes various complex circuit functions under the drive of a plurality of control signals so as to meet the actual circuit function requirements of technicians.
However, in the process of outputting the control signal by the communication terminal of the driving circuit, due to the interference of external noise or the mutual interference between adjacent electronic components in the driving circuit, the working state of the communication terminal is in an abnormal state, for example, the communication terminal is abnormally opened in the off state, so that a large error occurs in the control of the related electronic circuit, and the practical effect of the electronic circuit is reduced, taking the driving technology of the display screen as an example, the communication terminal of the driving circuit can respectively output multiple control signals, through which L ED (L light Emitting Diode) lamps inside the display screen can be in a light-Emitting or light-off state, because the driving circuit has multiple communication terminals, multiple L ED lamps can be simultaneously driven through the communication terminals to present a complete picture with richer colors, for example, when one communication terminal is in the off state, L ED lamps connected with the communication terminal cannot be in the light-off state, when the other communication terminal is in the on state, the electric energy connected with the communication terminal can maintain the electric energy connected with the communication terminal to be in a normal light-Emitting state, and because the communication terminal is in a communication terminal of the communication terminal L, when the other communication terminal is in the off state, the communication terminal can be in a normal state, and the communication terminal can be controlled by the light-Emitting signal, and the communication terminal can be displayed in a communication terminal, and the communication terminal can be in.
For example, when the communication terminal of the driving circuit is turned off, the communication terminal is in a floating state, because the communication terminals of the driving circuit are connected with a plurality of L ED lamps, in the process of circularly driving a plurality of L ED lamps, the potential of the communication terminal in the floating state is influenced by the turning-on and turning-off actions of other L ED lamps, so that the control signal of the communication terminal is abnormally changed, when the voltage difference between the two ends of the L ED lamp in the turning-off state is greater than the turning-on voltage of the L ED lamp, the L ED lamp is turned on and then is turned on mistakenly, so that the traditional display screen has the conditions of dim-bright in a black area, or the voltage of the communication terminal is interfered by the outside world, so that the brightness of the.
Disclosure of Invention
In view of this, embodiments of the present invention provide a port voltage stabilization control method for a driving circuit, a driving chip, an L ED driving circuit and a display device, which are intended to solve the problems that the level states of a plurality of communication terminals of the driving circuit are easily interfered by noise, the control performance of the driving circuit is poor and a large error exists in the conventional technical solution.
A first aspect of an embodiment of the present invention provides a port voltage stabilization control method for a driving circuit, where the driving circuit includes a plurality of signal ports and a plurality of switch units, and each switch unit is connected to each signal port in a one-to-one correspondence manner; each switch unit is connected with a logic control signal and is switched on or switched off according to the logic control signal; each signal port loads a port voltage under the control of the corresponding switch unit; the port voltage stabilization control method comprises the following steps:
confirming whether each switch unit is in a closed state or an open state according to the logic control signal;
detecting a port voltage of a signal port connected to the switching unit in an off state;
and determining whether the signal port has an interference component according to the voltage value of the port voltage, and eliminating the interference component in a charging and discharging mode if the signal port has the interference component.
In one embodiment, the determining, according to the voltage value of the port voltage, whether an interference component exists at the signal port, and eliminating, if the interference component exists at the signal port, the interference component in a charging and discharging manner specifically includes:
if the voltage value of the port voltage is lower than a first set value, charging a signal port related to the port voltage, and increasing the voltage value of the port voltage to be higher than the first set value; or
And if the voltage value of the port voltage is higher than a second set value, discharging the signal port related to the port voltage, and pulling down the voltage value of the port voltage to be lower than the second set value.
In one embodiment, when the switch unit is in a closed state, a port voltage of a signal port connected to the switch unit is not detected, and external electronic equipment is in a corresponding working state through the port voltage.
In one embodiment, the interference component of the current signal port is derived from an action signal generated by the other switch unit during the closing or opening process.
A second aspect of an embodiment of the present invention provides a driving chip, including:
a plurality of signal ports;
a plurality of switch units;
the driving control module is used for generating multi-path port voltage; the first conduction end of each switch unit is connected with each signal port in a one-to-one correspondence manner, and the second conduction end of each switch unit is connected with the drive control module;
the constant current port logic control module is connected with the control end of each switch unit, and is used for generating a logic control signal for controlling the switch units to be switched on or switched off and confirming whether each switch unit is in a switched-on state or a switched-off state according to the logic control signal;
the voltage detection module is connected with a plurality of signal ports of the driving chip and is used for detecting the port voltage of the signal port connected with the switch unit in a disconnected state; if the signal port has interference components, the voltage detection module sends out a first detection signal; and
and the voltage stabilizing module is connected with the constant current port logic control module, the voltage detection module and each signal port in the driving chip and is used for eliminating the interference component in a charging and discharging mode under the driving of the first detection signal.
In one embodiment thereof, the voltage detection module comprises a comparator; the first input end of the comparator is used for accessing a reference voltage, the second input end of the comparator is used for accessing the port voltage, and the output end of the comparator is used for outputting the first detection signal.
In one embodiment, the method further comprises:
the reference voltage generation module is connected with the voltage detection module and is used for generating a first set value and a second set value;
if the voltage detection module detects that the voltage value of the port voltage of the signal port connected with the switch unit in the disconnected state is lower than the first set value, the voltage stabilization module charges the signal port and raises the voltage value of the port voltage to be higher than the first set value; or
And if the voltage detection module detects that the voltage value of the port voltage of the signal port connected with the switch unit in the disconnected state is higher than the second set value, the voltage stabilization module discharges the signal port and pulls down the port voltage to be lower than the second set value.
In one embodiment, the voltage detection module is further configured to: when the switch unit is in a closed state, a port voltage of a signal port connected to the switch unit is not detected.
A third aspect of an embodiment of the present invention provides an L ED driver circuit, including:
the driving chip as described above;
the switch port logic control module is used for outputting a switch signal;
a plurality of L ED lamps arranged in an array to form a plurality of rows and columns;
a plurality of scanning lines arranged in an array in the longitudinal direction, the scanning lines being connected with the switch port logic control module, the scanning lines being further connected with the anodes of the L ED lamps in the same row, the switch signal being used for driving the L ED lamps in each row to be turned on in sequence, and
the data lines are connected with a signal port of the driving chip, the data lines are also connected with cathodes of L ED lamps in the same column, when the L ED lamp is turned on, the signal port of the driving chip outputs port voltage, and the port voltage drives the L ED lamp to emit light.
A fourth aspect of embodiments of the present invention provides a display device including the L ED driver circuit described above.
The port voltage stabilization control method of the driving circuit detects whether the switch unit is in a closed state or an open state, and if the switch unit is in the open state, the signal port connected with the switch unit is in a suspended state, and the port voltage of the signal port in the suspended state is detected; if the interference component of the signal port is obtained according to the detection result, the interference component of the signal port is eliminated in time in a charging and discharging mode, so that the signal port in a suspended state is prevented from outputting abnormal port voltage, the electronic equipment is prevented from being started abnormally, and the physical safety of related industrial products is damaged; therefore, the port voltage stabilization control method in the embodiment of the invention improves the stability and reliability of the port voltage stabilization control method by performing voltage stabilization detection on the port voltage of each suspended signal port, can output safe and normal port voltage through a plurality of signal ports of the driving circuit, and drives the electronic equipment to realize a stable circuit function; therefore, the problems that the communication end of the driving circuit is easily interfered by noise in the process of outputting the control signal and the control effect of the traditional driving circuit is abnormal in the traditional technology are effectively solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a driving circuit according to an embodiment of the invention;
fig. 2 is a flowchart illustrating a port voltage stabilization control method of a driving circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a driving chip according to an embodiment of the invention;
fig. 4 is a circuit structure diagram of a voltage detecting module and a voltage stabilizing module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a driving chip according to another embodiment of the invention;
fig. 6 is a schematic structural diagram of an L ED driving circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It needs to be firstly explained that the driving circuit is used as the core control component of the electronic circuit, the electronic device can be driven by the driving circuit to realize different circuit functions, and the driving circuit has complete functions and strong compatibility; exemplarily, fig. 1 shows a structural schematic diagram of a driving circuit 10 provided by an embodiment of the present invention, and as shown in fig. 1, the driving circuit 10 includes N signal ports OUT1, OUT2, … OUTN-1, OUTN arranged in parallel, and N switching units, through which signal interaction with external electronic devices can be achieved, where N is any positive integer greater than or equal to 2; each switch unit is connected with each signal port in a one-to-one correspondence manner, for example, referring to fig. 1, the first switch unit 101 is connected with the first signal port OUT1, the second switch unit 102 is connected with the second signal port OUT2, and so on, the operating states of the corresponding signal ports can be controlled by each switch unit respectively; each switch unit is switched in a logic control signal C1, and the switch unit is switched on or switched off according to the logic control signal C1; each signal port loads a port voltage under the control of the corresponding switch unit; the signal ports of the driving circuit 10 are connected to external electronic devices, and the voltage at the signal ports can drive the electronic devices to implement corresponding circuit functions, so that the electronic devices can be in different working states.
Specifically, when the switch unit is in a closed state or an open state, the port voltage of the signal port can be in different level states, so that the electronic device is in different working states; exemplarily, referring to a structural schematic of the driving circuit 10 in fig. 1, the switch unit is connected between a voltage source and a signal port, if the switch unit is closed, the voltage source outputs a low voltage through the switch unit, and a port voltage of the corresponding signal port is also at a low level; on the contrary, if the switch unit is switched off, the corresponding signal port is suspended, and the port voltage of the signal port is in an uncertain state; therefore, when the switch unit is in different on or off states under the control of the logic control signal, the port voltage of the signal port connected with the switch unit is also in different level states; therefore, the level state of the port voltage of the signal port and the on-off state of the switch unit have a one-to-one correspondence relationship; when the driving circuit is applied to different industrial technical fields, the plurality of switch units in the driving circuit 10 are sequentially turned on under the control of the logic control signal, the plurality of signal ports in the driving circuit 10 can output port voltages in different level states, the port voltages can enable the electronic device to realize more complex circuit functions, the controllability of the driving circuit 10 is improved, the electronic device can realize corresponding circuit functions according to actual needs of users, and the driving circuit 10 has a wider application range.
It should be noted that the driving circuit 10 shown in fig. 1 is an application object of the port voltage stabilization control method in the present embodiment; since the driving circuit 10 in fig. 1 is only an embodiment, those skilled in the art can perform any operations such as modification, expansion, and extension on the structure of the driving circuit 10 in fig. 1, and the port voltage stabilization control method can still be applied to different types of driving circuits in the art without departing from the essential operation steps of the port voltage stabilization control method in the embodiment.
However, when the plurality of switch units of the driving circuit 10 are turned on or turned off, the suspended signal port in the driving circuit is affected by the level states of the other signal ports, and the suspended signal port in the driving circuit still outputs an effective port voltage, so that the electronic component connected to the suspended signal port is in an abnormal starting state, the control stability of the driving circuit 10 is low, and a large control error exists; to solve the problem, an embodiment of the present invention provides a method for controlling a port voltage stabilization of a driver circuit, and for convenience of description, fig. 2 shows a specific flow of the method for controlling a port voltage stabilization of a driver circuit provided in this embodiment, and only shows parts related to this embodiment, which are detailed as follows:
as shown in fig. 2, the port voltage stabilization control method includes the following steps:
s201: and confirming whether each switch unit is in a closed state or an open state according to the logic control signal.
As referred to above, the control information of the logic control signal has a corresponding relationship with the on state or the off state of the switch unit; illustratively, by changing the level state of the logic control signal, the switch units will be in different on-states and off-states, and then each switch unit can be accurately judged to be in the on-state or the off-state according to the level state of the logic control signal; therefore, the on-off state of each switch unit in the driving circuit can be accurately judged through the logic control signal, the detection accuracy is high, and the control response speed of the port voltage stabilization control method to the abnormal port voltage state in the signal port is improved.
S202: detecting a port voltage of a signal port connected to the switching unit in an off state.
If the switch unit is in the off state, the switch unit is in the suspended state; under normal control conditions, the electronic equipment connected with the switch unit in the suspension state is in a power-off stop state, and cannot realize corresponding circuit functions; therefore, in S202, whether the port voltage of the signal port in the suspended state is in the abnormal state can be accurately determined according to the port voltage of the signal port in the suspended state, so that the phenomenon that the electronic device connected to the signal port in the suspended state is abnormally started is avoided, and the safe operation of all the signal ports in the driving circuit is ensured.
S203: and determining whether the signal port has an interference component according to the voltage value of the port voltage, and eliminating the interference component in a charging and discharging mode if the signal port has the interference component.
It should be noted that the interference component is an interference voltage or an interference current; when the suspended signal port has an interference component, the port of the suspended signal port is in an abnormal state, so that the electronic equipment is abnormally powered on and started, and the stability and the accuracy of the port voltage stabilization control method are reduced.
In the embodiment of the invention, when the switch unit is disconnected, the signal port of the driving circuit is in a suspended state, and whether the signal port is in a normal working state or not is judged by detecting the port voltage of the suspended signal port; if the signal port has an interference component, changing the voltage value of the port voltage of the signal port in a charging and discharging mode to eliminate the interference component, so that the voltage value of the port voltage of the suspended signal port returns to a normal state, and the control error of a driving circuit caused by the interference component in the signal port is avoided; therefore, in the embodiment, voltage detection is performed on the suspended signal port in the driving circuit, and when the suspended signal port is interfered, voltage stabilization processing is rapidly performed on the suspended signal port, so that all the signal ports in the driving circuit are ensured to be in a normal potential state under the control of the logic control signal, the stability and reliability of the driving circuit are improved, the driving circuit can enable electronic equipment to realize a more stable circuit function, and the practical value is higher; the problems that the potential of a suspended signal port of a driving circuit is abnormal, a control signal of the suspended signal port causes abnormal starting of electronic equipment, and the control effect of the driving circuit has large errors in the traditional technology are effectively solved.
As an alternative embodiment, the interference component of the current signal port is derived from the action signal generated by the other switch unit during the closing or opening process.
In this embodiment, a plurality of switch units arranged in parallel exist in the driving circuit, and each switch unit can be turned on or off under the control of a logic control signal, so that the potential of the current signal port in the suspended state is influenced by the turning-on or turning-off actions of other switch units, so that the port voltage of the signal port in the suspended state has an interference component, the voltage value of the port voltage is in an abnormal state, and the suspended signal port of the driving circuit generates a large voltage fluctuation error; therefore, when the action signals generated by other switch units in the on-off process cause interference to the signal port in the current suspension state, the port voltage stabilization control method in the embodiment can prevent in time: the opening or closing action signals of other switch units cause the problem of false opening of external electronic equipment; therefore, the port voltage stabilization control method can enable all signal ports of the driving circuit to be in a safe and normal working state.
As an optional implementation manner, the determining, according to the voltage value of the port voltage, whether an interference component exists at the signal port, and eliminating, if an interference component exists at the signal port, the interference component in a charging and discharging manner specifically includes:
if the voltage value of the port voltage is lower than a first set value, charging a signal port related to the port voltage, and increasing the voltage value of the port voltage to be higher than the first set value; or if the voltage value of the port voltage is higher than a second set value, discharging the signal port related to the port voltage, and pulling down the voltage value of the port voltage to be lower than the second set value.
Optionally, the first set value and the second set value are preset, and the second set value is greater than the first set value; specifically, the first set value is 3.0V dc voltage, and the second set value is 4.0V dc voltage; whether the port voltage of the suspended signal port is in a stable and safe range can be accurately judged through the first set value and the second set value.
The first set value represents a minimum voltage threshold of the suspended signal port, and when the voltage value of the suspended signal port is lower than the first set value, the port voltage of the suspended signal port is in an abnormal state.
When the voltage value of the port voltage is higher than the second set value, it indicates that a large interference component occurs in the port voltage of the suspended signal port, and the interference component will cause the electronic device to be in an abnormal power-on state, thereby reducing the control stability of the port voltage stabilization control method.
In the embodiment of the application, by detecting the port voltage of the suspended signal port, when the voltage value of the port voltage of the signal port is in an abnormal state, the suspended signal port is respectively charged or discharged; specifically, the port voltage of the suspended signal port can be raised through the charging operation, and the port voltage of the suspended signal port can be reduced through the discharging operation, so that the voltage value of the port voltage of the suspended signal port can be maintained at a normal amplitude, the suspended signal port is prevented from being interfered to output an abnormal port voltage, and the voltage stabilization response speed of the port voltage stabilization control method in the embodiment to the abnormal level state of the suspended signal port is improved; the voltage value of the port voltage of the suspended signal port in the driving circuit can be always in a safe and normal amplitude range, the control accuracy of the port voltage stabilization control method is improved, and abnormal power-on starting of the electronic equipment caused by the suspended signal port in the driving circuit is avoided.
As an optional implementation manner, when the switch unit is in the closed state, the port voltage of the signal port connected to the switch unit is not detected, and the external electronic device is in the corresponding operating state through the port voltage.
In this embodiment, if the switch unit is closed, it is stated that the signal port connected to the switch unit is not in a floating state, when the switch unit is closed, the port voltage can be output to the electronic device through the corresponding signal port, the electronic device is driven to be in a normal and stable operating state through the port voltage, and when the port voltage of the signal port is changed, the circuit function realized by the electronic device will also be changed accordingly, it should be noted that the electronic device in this embodiment may be any type of electronic device in the art, such as L ED lamp, and the like, which is not limited herein.
Fig. 3 shows a schematic structure of a driving chip 20 according to an embodiment of the present invention, and referring to fig. 2, the driving chip includes: the circuit comprises a plurality of signal ports, a plurality of switch units 201, a drive control module 202, a constant current port logic control module 203, a voltage detection module 204 and a voltage stabilizing module 205.
The driving control module 202 is configured to generate a multi-port voltage; the first conduction end of each switch unit 201 is connected with each signal port in a one-to-one correspondence manner, and the second conduction end of each switch unit is connected with the driving control module 202; the driving control module 202 has signal integration processing and analysis capabilities, optionally, the driving control module 202 performs signal interaction with an external mobile terminal, the mobile terminal transmits a control signal to the driving control module 202, the control signal includes operation information of a user, the driving control module 202 generates a multi-port voltage according to the control signal, and the port voltage can drive corresponding electronic equipment to realize corresponding circuit functions; therefore, the driving control module 202 in this embodiment can change the operating state of the electronic device according to the operation information of the user, so as to achieve the optimal control effect of the driving chip 20, the circuit function achieved by the electronic device can meet the actual requirement of the user, the user experience is better, and the controllability of the driving chip 20 is ensured.
The constant current port logic control module 203 is connected with the control end of each switch unit 201, and the constant current port logic control module 203 is configured to generate a logic control signal for controlling the switch unit 201 to be turned on or turned off, and is further configured to determine whether each switch unit 201 is in a turned-on state or a turned-off state according to the logic control signal; the switch units 201 can be directly turned on or off through the logic control signals, optionally, when the logic control signals have different level states, the switch units 201 are in different on or off states, and the switch units 201 can be turned on or off respectively through the level states of the logic control signals, so that the control flexibility and stability of the on-off states of the switch units 201 in the driving chip 20 are improved; and the on-off state of each switch unit 201 can be accurately obtained according to the logic control signal, so as to realize voltage stabilization control on each signal port, prevent each signal port of the driving chip 20 from generating control errors, and improve the control stability of the driving chip 20.
Optionally, each switch unit 201 includes a switch tube, and the switch tube is an MOS tube or a triode; illustratively, the switch tube is an MOS tube, a first conduction electrode of the MOS tube is a first conduction end of the switch unit 201, a second conduction electrode of the MOS tube is a second conduction end of the switch unit 201, and a control electrode of the MOS tube is a control end of the switch unit 201; when the switch unit 201 is in a closed or open state, the port voltage of the signal output end of the driving chip 20 is in different level states; for example, when the on or off state between the first conducting terminal and the second conducting terminal of the switching unit 201 can be changed by the logic control signal, and when the first conducting terminal and the second conducting terminal of the switching unit 201 are closed, the signal output terminal connected to the switching unit 201 can directly access the port voltage; when the first conducting end and the second conducting end of the switch unit 201 are disconnected, the signal output end connected with the switch unit 201 can directly access port voltage; therefore, the signal ports of the driving chip 20 in this embodiment can be in different operating states respectively.
The voltage detection module 204 is connected to a plurality of signal ports of the driving chip 20, and the voltage detection module 204 is configured to detect a port voltage of a signal port connected to the switching unit 201 in an off state; and if the signal port has interference components, the voltage detection module sends out a first detection signal.
The voltage stabilizing module 205 is connected to each signal port of the constant current port logic control module 203, the voltage detecting module 204, and the driver chip, and the voltage stabilizing module 205 is configured to eliminate the interference component in a charging and discharging manner under the driving of the first detection signal.
It should be noted that the driver chip 20 in fig. 3 corresponds to the port voltage stabilization control method of the driver circuit, and therefore, as to the specific implementation of the driver chip 20 in this embodiment, reference may be made to the embodiment of the port voltage stabilization control method in fig. 2 and the embodiment of the driver chip in fig. 1, which will not be described again here.
In this embodiment, when the signal port is suspended, the voltage detection module 204 can detect whether there is an interference component in the suspended signal port in real time according to the voltage value of the port voltage, so as to avoid a control error caused by interference of the port voltage of the suspended signal port; when there is interference component in the port voltage of unsettled signal port, then can drive in real time through first detected signal: the voltage stabilizing module 205 takes voltage stabilizing control measures for the suspended signal port to return the port voltage to a stable and safe range, the signal output end of the driving chip 20 can be always in a safe operation state to provide stable port voltage for external electronic equipment, and the electronic equipment can realize a stable circuit function through the driving chip 20, so that the driving chip 20 in the embodiment has strong compatibility and can be widely applied to various different industrial fields; the problems that in the prior art, a suspended signal port of a driving chip is easily interfered, and then related electronic components are abnormally started, and the control stability and reliability of the conventional driving chip are poor are effectively solved.
As an alternative implementation, fig. 4 shows a specific circuit structure of the voltage detection module 204 and the voltage stabilization module 205 provided in this embodiment, and as shown in fig. 4, the voltage detection module 204 includes: a comparator Cmp; the first input end of the comparator Cmp is used for connecting a reference voltage Vref, the second input end of the comparator Cmp is used for connecting the port voltage, and the output end of the comparator Cmp is used for outputting the first detection signal.
It should be noted that the first input terminal of the comparator Cmp is a non-inverting input terminal or an inverting input terminal; illustratively, the first input of the comparator Cmp is an inverting input and the second input of the comparator Cmp is a non-inverting input.
When the second input end of the comparator Cmp is connected to the suspended signal port of the driver chip 20, the second input end of the comparator Cmp is connected to the port voltage of the suspended signal input end, and whether an interference component exists in the port voltage of the suspended signal port is determined by comparing the difference amplitude between the port voltage and the port voltage; exemplarily, when the port voltage is lower than the reference voltage Vref, it indicates that there is no interference component in the port voltage; when the port voltage is higher than the reference voltage Vref, it indicates that there is an interference component in the port voltage, and the output end of the comparator Cmp outputs a first detection signal to the voltage stabilization module 205 to drive the voltage stabilization module 205 to take voltage stabilization control measures for the suspended signal port, and the port voltage of the suspended signal port can be always in a stable and safe range; therefore, the voltage detection module 204 in this embodiment has a simplified circuit structure, has higher detection sensitivity for the port voltage of the signal port, and improves the response speed of the voltage stabilization control for the signal port of the driver chip 20.
As an alternative embodiment, as shown in fig. 4, the voltage stabilizing module 205 includes: a first NOR gate NOR1, a second NOR gate NOR2, an inverter INV, a first control switch M1, a second control switch M2, a first current source Ir1 and a second current source Ir 2.
Wherein, a first input terminal of the first NOR gate NOR1 and an input terminal of the inverter INV are commonly connected to the voltage detection module 204, a first input terminal of the first NOR gate NOR1 is used for receiving a first detection signal, an output terminal of the first NOR gate NOR1 is connected to the control terminal of the first control switch M1, a first conduction terminal of the first control switch M1 is connected to the first current source Ir1, a second conduction terminal of the first control switch M1 is connected to a first conduction terminal of the second control switch M2, the second conducting end of the second control switch M2 is connected with a second current source Ir2, the output end of the inverter INV is connected with the first input end of the second NOR gate NOR2, a second input terminal of the first NOR gate NOR1 and a second input terminal of the second NOR gate NOR2 are commonly connected to a switch execution signal, the output end of the second NOR gate NOR2 is connected with the control end of the second control switch M2; when the second NOR gate NOR2 performs NOR logic operation on the switch indication signal and the signal output by the voltage detection module 204, the second NOR gate NOR2 controls the second control switch M2 to be turned on or off; the switch indication signal can be used to indicate that the switch unit 201 is turned on or off, and for example, when the switch unit 201 is turned on, the switch indication signal is in a first level state; when the switch unit 201 is turned off, the switch indication signal is in a second level state; whether the switching unit 201 is in the closed or open state can be obtained by the level state of the switching indication signal.
The second conducting end of the first control switch M1 and the first conducting end of the second control switch M2 are connected in common to form a constant voltage output port of the voltage stabilizing module 205, and the constant voltage output port of the voltage stabilizing module 205 is used for changing the port voltage of the suspended signal port to eliminate an interference component in the port voltage; the working process of the voltage stabilizing module 205 in this embodiment is as follows: when the switch unit 201 is turned off, the signal port connected to the switch unit 201 is in a suspended state, and the voltage detection module 204 detects that the voltage value of the port voltage of the suspended signal port is in an abnormal state, the first control switch M1 and the second control switch M2 are closed, the voltage stabilization module 205 takes charge and discharge measures for the suspended signal port, so that the port voltage of the suspended signal port returns to a safe and normal range, and the signal port of the driving chip 20 is ensured to be always in a safe state; on the contrary, when the signal port is not suspended, or the port voltage of the suspended signal port is in a safe and normal range, the first control switch M1 and the second control switch M2 are both turned off, and the voltage stabilizing module 205 cannot take charging and discharging measures for the suspended signal port; therefore, the voltage regulation module 205 in this embodiment utilizes the logic operation functions of the first NOR gate NOR1 and the second NOR gate NOR2 to timely eliminate the interference component to the abnormal port voltage of the floating signal port, so as to improve the stability and controllability of the signal port control of the driver chip 20, and meanwhile, the voltage regulation module 205 has a simplified circuit structure.
As an alternative embodiment, the first control switch M1 and the second control switch M2 are MOS transistors or triodes, and the first control switch M1 and the second control switch M2 have the same conduction polarity; for example, the first control switch M1 and the second control switch M2 are both NMOS transistors, or the first control switch M1 and the second control switch M2 are both PNP transistors; therefore, the voltage regulation module 205 in this embodiment has a more flexible circuit structure.
As an alternative implementation, fig. 5 shows another structural schematic of the driving chip 20 provided in the embodiment of the present invention; compared to the structure of the driving chip 20 in fig. 2, the driving chip 20 in fig. 5 further includes: a reference voltage generation module 301.
The reference voltage generating module 301 is connected to the voltage detecting module 204, and the reference voltage generating module 204 is configured to generate a first set value and a second set value.
If the voltage detection module 301 detects that the voltage value of the port voltage of the signal port connected to the switch unit 201 in the off state is lower than the first set value, the voltage stabilization module 201 charges the signal port to increase the voltage value of the port voltage to be higher than the first set value; or
If the voltage detection module 301 detects that the voltage value of the port voltage of the signal port connected to the switch unit 201 in the off state is higher than the second set value, the voltage stabilization module 201 discharges the signal port, and the port voltage is pulled down to be lower than the second set value.
Wherein the second set point is greater than the first set point.
It should be noted that, in fig. 5, the specific working principle and the working process of the reference voltage generating module 301 may refer to the above embodiment of the port voltage stabilization control method, and details thereof will not be described here.
In the structural schematic of the driving chip 20 shown in fig. 5, it can be determined whether the voltage value of the port voltage of the suspended signal port is abnormal according to the first set value and the second set value; the voltage detection module 204 can accurately detect the port voltage of the suspended signal port, and if the detected port voltage of the suspended signal port is interfered by the outside world, the voltage stabilization module 205 rapidly controls the port voltage of the suspended signal port within a normal amplitude range, so as to realize a voltage stabilization control function for the suspended signal port of the driver chip 20; therefore, the plurality of signal ports of the driving chip 20 in this embodiment can always output stable and safe port voltages, and the phenomena that the port voltages of the suspended signal ports are interfered and the electronic device is abnormally started are avoided; the driving chip 20 has higher control stability and reliability.
As an optional implementation manner, the voltage detection module 204 is further configured to: when the switch unit 201 is in a closed state, a port voltage of a signal port connected to the switch unit 201 is not detected; as described above, when the switch unit 201 is closed, the port voltage is output to the corresponding signal port through the switch unit 201 by the driving control module 202, and at this time, the signal port is not in a suspended state, and the electronic component can be driven to be in a stable and safe working state by the port voltage; therefore, the voltage detection module 204 in this embodiment does not detect the unsettled signal port, so as to save the port voltage detection time for the signal port, simplify the detection procedure for the port voltage of the unsettled signal port in the driver chip 20, and the driver chip 20 can achieve better control efficiency for the electronic device, thereby improving the practical value and the application range of the driver chip 20.
Fig. 6 shows a structural schematic diagram of L ED driving circuit 40 according to an embodiment of the present invention, referring to fig. 6, the L ED driving circuit 40 includes the driving chip 20, the switch port logic control module 401, a plurality of L ED lamps, a plurality of scanning lines G arranged in an array in a longitudinal direction, and a plurality of data lines D arranged in an array in a transverse direction, the switch port logic control module 401 is configured to output a switch signal, the switch signal has a circuit on-off control function, the plurality of L ED lamps are arranged in a plurality of rows and a plurality of columns in an array, and the plurality of L ED lamps are powered on to be in a corresponding light emitting state, the scanning lines D are connected to the switch port logic control module 401, the scanning lines G are further connected to anodes of L ED lamps in the same row, the switch signal is configured to drive each row L of the ED lamps to be sequentially turned on, the scanning lines G have a corresponding switch signal, when the switch signal on the scanning lines G is output to anodes of the corresponding L ED lamps, the same row can be synchronously controlled by the switch signal to be in the same light emitting state, when the switch signal is in a first light emitting state, or when the switch signal is in a second light emitting state, such as an ED signal, when the switch driving signal 4835, the switch is in a second switch on level, when the switch is equal to be equal to an emission level, or equal to an emission level, such as an emission level.
Therefore, the switch port logic control module 401 in this embodiment can output multiple switch signals, the level state of each switch signal has a one-to-one correspondence relationship with the on-off state of the L ED lamps, when the switch port logic control module 401 outputs multiple switch signals, each switch signal sequentially outputs an effective ground pulse level, one row of L ED lamps are driven to emit light through the pulse level, when the previous row of L0 ED lamps emit light, the other row of L1 ED lamps are continuously driven through the other switch signal, and the like, so that a dynamic scanning driving process for multiple rows of L ED lamps is realized, multiple L ED lamps can cooperate with each other to display a more coordinated and complete picture, in this embodiment, only one row of L ED lamps can be displayed at a certain time, then the next row of L ED lamps can be displayed at the next time, until all rows of L ED lamps in the L ED driving circuit 40 are scanned and driven to display the whole picture, so that the L ED lamps in this embodiment have lower scanning driving cost, and the dynamic display effect of multiple L ED lamps is guaranteed.
The data line D is connected with a signal port of the driving chip 20, the data line D is further connected with cathodes of L ED lamps in the same column, when the L ED lamp is turned on, the signal port of the driving chip 20 outputs port voltage, the port voltage drives the L ED lamp to emit light, in this embodiment, the L ED lamp is controlled to be turned on or turned off through a switch signal, the port voltage output by the signal port of the driving chip 20 contains L ED lamp control information, parameters such as light color and brightness of the L ED lamp can be changed through port current, exemplarily, referring to the above, a plurality of signal ports of the driving chip 20 are sequentially and circularly turned on, when the signal port is turned on, the port voltage exists on the data line D connected with the signal port, and the port voltage is output to all L ED lamps in the same column through the data line D to change the light emitting state of the L ED lamp in real time, so that the driving chip 20 can control the light emitting states of a plurality of L ED lamps in real time, and guarantee the work stability and safety of the ED 2 lamp L.
Referring to the embodiments of fig. 3 to 5, in the structure of the L ED driving circuit 40 provided in this embodiment, the light emitting states of a plurality of L ED lamps can be timely adjusted by the port voltage output by the driving chip 20, when a plurality of signal ports of the driving chip 20 are sequentially closed or opened, the light emitting effect of the L ED lamp can be controlled in real time by the port voltage output by the driving chip 20, in combination with the above, when the signal port of the driving chip 20 is suspended, the port voltage of the suspended signal port may be interfered by other noise signals, for example, a certain row of L ED lamps and a certain column of 45 ED lamps are turned on or turned off, the port voltage of the suspended signal port fluctuates, so that the L ED lamp is originally turned off and is turned on by an interference component, the driving chip 20 in this embodiment can automatically detect the level state of the signal port in the suspended state, when the suspended signal port is interfered, the driving chip 20 can take a voltage stabilization control response to the suspended signal port, so that the voltage of the suspended signal port can be maintained in a safe and normal range, the driving chip 20 can effectively improve the light emitting reliability of the conventional light emitting control circuit L, thereby effectively solving the problem that the led lamp driving circuit L is controlled by a plurality of the conventional technologies that the suspended signal ports is turned on.
Fig. 7 shows a structural schematic diagram of a display device 50 according to an embodiment of the present invention, please refer to fig. 7, where the display device 50 includes the L ED driving circuit 40 as described above, and referring to the embodiment of fig. 6, the display device 50 in this embodiment can achieve a normal light emitting effect under the control of the driving chip, and the port voltage of the signal port of the driving chip can be always in a stable range, the port voltage inside the display device 50 can avoid the interference of external noise, the L ED lamp inside the display device 50 can achieve dynamic scanning to achieve better clear and complete video, the screen brightness of the display device 50 is more uniform and stable, the reliability and the display effect of the display device 20 are improved, and a user can obtain better visual experience, so that the display device 50 in this embodiment has better video display quality, can be widely applied to different industrial technical fields, has a very high practical value, and effectively solves the problem that the wrong turn-on of the port voltage inside the display device in the conventional technology is interfered, which causes dark and bright black areas in the display device, the display quality is unstable, and the display quality of the display device is not good.
It should be noted that, in the above embodiments, the switch port logic control module 401, the reference voltage generation module 301, the driving control module 202, and the constant current port logic control module 203 may all be implemented by using a circuit structure in the conventional art, which is not particularly limited herein, for example, the switch port logic control module 401 may be implemented by using a switch circuit in the conventional art, where the switch circuit includes a MOS transistor array, the MOS transistor array includes a plurality of MOS transistors arranged in parallel, the MOS transistors are controlled to be turned on or off, so that the MOS transistor array can output switch signals in different level states, the switch signals are used to control the turn-on or turn-off of a plurality of L ED lamps, and the switch signals can make the corresponding L ED lamp emit light or extinguish, so as to improve the control response speed of L ED lamps, and the plurality of L ED lamps have higher driving control efficiency.
It should be noted that, according to the embodiments of fig. 6 and fig. 7, the driving chip 20 in fig. 3 is applied to L ED lighting field, since this is only an example and does not constitute a technical limitation for the driving chip 20 in the present invention, and a person skilled in the art can apply the port voltage stabilization control method of the driving circuit and the driving chip 20 to various technical fields, such as electric vehicle control, drone control, etc., on the basis of not violating the essential technical features of the driving chip 20, to sum up, the port voltage stabilization control method in the present invention can detect the voltage of the suspended signal port of the driving chip to prevent the port voltage of the suspended signal port from suffering interference, and the electronic device is triggered by mistake, the port voltage stabilization control method greatly improves the control stability and reliability for the electronic device, greatly improves the physical safety performance of the electronic device, the port voltage stabilization control method can be compatible and applicable to various industrial technical fields, and therefore the port voltage stabilization control method has a positive effect on the stabilization and safety control technology of the electronic device in the technical field, and will result in a great industrial production value.
Various embodiments are described herein for various devices, circuits, apparatuses, systems, and/or methods. Numerous specific details are set forth in order to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the description. It will be appreciated by those of ordinary skill in the art that the embodiments herein and shown are non-limiting examples, and thus, it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.
Reference throughout the specification to "various embodiments," "in an embodiment," "one embodiment," or "an embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in various embodiments," "in some embodiments," "in one embodiment," or "in an embodiment," or the like, in places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic illustrated or described in connection with one embodiment may be combined, in whole or in part, with features, structures, or characteristics of one or more other embodiments without presuming that such combination is not an illogical or functional limitation. Any directional references (e.g., plus, minus, upper, lower, upward, downward, left, right, leftward, rightward, top, bottom, above …, below …, vertical, horizontal, clockwise, and counterclockwise) are used for identification purposes to aid the reader's understanding of the present disclosure, and do not create limitations, particularly as to the position, orientation, or use of the embodiments.
Although certain embodiments have been described above with a certain degree of particularity, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of this disclosure. Joinder references (e.g., attached, coupled, connected, and the like) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. Thus, connection references do not necessarily imply that two elements are directly connected/coupled and in a fixed relationship to each other. The use of "for example" throughout this specification should be interpreted broadly and used to provide non-limiting examples of embodiments of the disclosure, and the disclosure is not limited to such examples. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not limiting. Changes in detail or structure may be made without departing from the disclosure.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A port voltage stabilization control method of a driving circuit comprises a plurality of signal ports and a plurality of switch units, wherein each switch unit is connected with each signal port in a one-to-one correspondence mode; each switch unit is connected with a logic control signal and is switched on or switched off according to the logic control signal; each signal port loads a port voltage under the control of the corresponding switch unit; the port voltage stabilization control method is characterized by comprising the following steps:
confirming whether each switch unit is in a closed state or an open state according to the logic control signal;
detecting a port voltage of a signal port connected to the switching unit in an off state;
and determining whether the signal port has an interference component according to the voltage value of the port voltage, and eliminating the interference component in a charging and discharging mode if the signal port has the interference component.
2. The port voltage stabilization control method according to claim 1, wherein the determining, according to the voltage value of the port voltage, whether the signal port has an interference component, and if the signal port has the interference component, eliminating the interference component by charging and discharging includes:
if the voltage value of the port voltage is lower than a first set value, charging a signal port related to the port voltage, and increasing the voltage value of the port voltage to be higher than the first set value; or
And if the voltage value of the port voltage is higher than a second set value, discharging the signal port related to the port voltage, and pulling down the voltage value of the port voltage to be lower than the second set value.
3. The port voltage stabilization control method according to claim 1, wherein when the switch unit is in a closed state, a port voltage of a signal port connected to the switch unit is not detected, and an external electronic device is in a corresponding operating state by the port voltage.
4. The port voltage stabilization control method according to claim 1, wherein the interference component of a current signal port is derived from action signals generated by other switch units in a closing or opening process.
5. A driver chip, comprising:
a plurality of signal ports;
a plurality of switch units;
the driving control module is used for generating multi-path port voltage; the first conduction end of each switch unit is connected with each signal port in a one-to-one correspondence manner, and the second conduction end of each switch unit is connected with the drive control module;
the constant current port logic control module is connected with the control end of each switch unit, and is used for generating a logic control signal for controlling the switch units to be switched on or switched off and confirming whether each switch unit is in a switched-on state or a switched-off state according to the logic control signal;
the voltage detection module is connected with a plurality of signal ports of the driving chip and is used for detecting the port voltage of the signal port connected with the switch unit in a disconnected state; if the signal port has interference components, the voltage detection module sends out a first detection signal; and
and the voltage stabilizing module is connected with the constant current port logic control module, the voltage detection module and each signal port in the driving chip and is used for eliminating the interference component in a charging and discharging mode under the driving of the first detection signal.
6. The driving chip of claim 5, wherein the voltage detection module comprises a comparator; the first input end of the comparator is used for accessing a reference voltage, the second input end of the comparator is used for accessing the port voltage, and the output end of the comparator is used for outputting the first detection signal.
7. The driver chip of claim 5, further comprising:
the reference voltage generation module is connected with the voltage detection module and is used for generating a first set value and a second set value;
if the voltage detection module detects that the voltage value of the port voltage of the signal port connected with the switch unit in the disconnected state is lower than the first set value, the voltage stabilization module charges the signal port and raises the voltage value of the port voltage to be higher than the first set value; or
And if the voltage detection module detects that the voltage value of the port voltage of the signal port connected with the switch unit in the disconnected state is higher than the second set value, the voltage stabilization module discharges the signal port and pulls down the port voltage to be lower than the second set value.
8. The driver chip of claim 5, wherein the voltage detection module is further configured to: when the switch unit is in a closed state, a port voltage of a signal port connected to the switch unit is not detected.
9. An L ED driving circuit, comprising:
the driver chip of any one of claims 6-8;
the switch port logic control module is used for outputting a switch signal;
a plurality of L ED lamps arranged in an array to form a plurality of rows and columns;
a plurality of scanning lines arranged in an array in the longitudinal direction, the scanning lines being connected with the switch port logic control module, the scanning lines being further connected with the anodes of the L ED lamps in the same row, the switch signal being used for driving the L ED lamps in each row to be turned on in sequence, and
the data lines are connected with a signal port of the driving chip, the data lines are also connected with cathodes of L ED lamps in the same column, when the L ED lamp is turned on, the signal port of the driving chip outputs port voltage, and the port voltage drives the L ED lamp to emit light.
10. A display device comprising the L ED driver circuit of claim 9.
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| KR102012925B1 (en) * | 2012-01-26 | 2019-08-23 | 삼성디스플레이 주식회사 | Organic Light Emitting Display Device and Driving Method thereof |
| KR20150002201A (en) * | 2013-06-28 | 2015-01-07 | 삼성전기주식회사 | Light emitting diode driving apparatus |
| KR101503874B1 (en) * | 2013-09-25 | 2015-03-19 | 매그나칩 반도체 유한회사 | Light emitting diode driver circuit and lighting apparutus having the same |
| CN103632635B (en) * | 2013-11-08 | 2016-04-13 | 电子科技大学 | Power tube grouping hybrid driving circuit |
| CN204102540U (en) * | 2014-01-24 | 2015-01-14 | 上海得倍电子技术有限公司 | LED display scanning monitor and encoded control chip |
| CN106658811B (en) * | 2015-10-30 | 2018-03-16 | 常州明石晶电科技有限公司 | A kind of LED light source and its drive circuit |
| CN205810342U (en) * | 2016-05-24 | 2016-12-14 | 北京集创北方科技股份有限公司 | LED display driving system and LED display |
| CN206433225U (en) * | 2017-02-07 | 2017-08-22 | 贵州大学 | A kind of piecewise linearity constant current LED drive circuit |
| CN109377959A (en) * | 2018-12-07 | 2019-02-22 | 合肥鑫晟光电科技有限公司 | Show drive voltage supply device, display device and alternating current shutdown control method |
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