CN109410878B - Driving circuit, driving device and display device - Google Patents
Driving circuit, driving device and display device Download PDFInfo
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- CN109410878B CN109410878B CN201811547518.1A CN201811547518A CN109410878B CN 109410878 B CN109410878 B CN 109410878B CN 201811547518 A CN201811547518 A CN 201811547518A CN 109410878 B CN109410878 B CN 109410878B
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- 230000011664 signaling Effects 0.000 claims description 7
- 230000002159 abnormal effect Effects 0.000 abstract description 11
- OFIYHXOOOISSDN-UHFFFAOYSA-N tellanylidenegallium Chemical compound [Te]=[Ga] OFIYHXOOOISSDN-UHFFFAOYSA-N 0.000 description 11
- 239000010409 thin film Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000010408 film Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000004973 liquid crystal related substance Substances 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002096 quantum dot Substances 0.000 description 1
Classifications
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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
- G09G3/36—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 using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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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
- G09G3/36—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 using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
- G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electronic Switches (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The embodiment of the application belongs to the technical field of display, and provides a driving circuit, a driving device and a display device, wherein a comparison module is used for comparing a driving voltage signal with a threshold voltage and outputting a corresponding first control signal, a first switch module is used for controlling the on or off of an on voltage signal according to the first control signal, a second switch module is used for controlling the on or off of an off voltage signal according to the first control signal, a third switch module is used for selecting a first output end or a second output end according to the first control signal and outputting the driving voltage signal, and a fourth switch module is used for controlling the on and off of a power supply voltage source signal according to a second control signal output by the second comparison module and a third control signal output by the third comparison module, so that the output of the power supply voltage source signal is turned off in time when a signal in a panel is abnormal, and the problem of circuit burnout caused by abnormal operation of a grid film driving chip is avoided.
Description
Technical Field
The embodiment of the application belongs to the technical field of display, and particularly relates to a driving circuit, a driving device and a display device.
Background
In a thin Film transistor liquid crystal display (Thin Film Transistor Liquid CRYSTAL DISPLAY, TFT-LCD), a system main board connects R/G/B compression signals, control signals and power signals with connectors on a printed circuit board (Printed Circuit Board, PCB) through wires, and then video data is processed through a timing controller (Timing Controller, TCON) Chip on the printed circuit board and then connected with a display area of a panel through a Source-Chip on Film (S-COF) and a Gate-Chip on Film (G-COF) Chip on the printed circuit board, thereby enabling the liquid crystal display to obtain a desired power signal.
However, during the production and use process, the signal abnormality may be caused by the foreign matters entering the panel, so that the operation of the gate thin film driving chip may be abnormal.
Disclosure of Invention
The embodiment of the application provides a driving circuit, a driving device and a display device, which aim to solve the problem that a grid film driving chip works abnormally due to abnormal signals caused by foreign matters entering a panel in the production and use processes.
The embodiment of the application provides a driving circuit which is connected with a driving voltage source, a threshold voltage source, an opening voltage signal source and a closing voltage signal source, and comprises the following components:
the first comparison module is connected with the driving voltage source and the threshold voltage source, and is used for receiving a driving voltage signal, comparing the driving voltage signal with the threshold voltage and outputting a corresponding first control signal;
the first switch module is connected with the starting voltage signal source and the first comparison module, and is used for receiving the starting voltage signal and the first control signal and controlling the starting voltage signal to be turned on or turned off according to the first control signal;
the second switch module is connected with the closing voltage signal source and the first comparison module, and is used for receiving a closing voltage signal and the first control signal and controlling the closing voltage signal to be turned on or turned off according to the first control signal;
the third switch module is connected with the driving voltage source and the first comparison module, and comprises a first output end and a second output end, and is used for receiving the driving voltage signal and the first control signal, and selecting the first output end or the second output end to output the driving voltage signal according to the first control signal;
The second comparison module is connected with the first output ends of the first switch module and the third switch module, and is used for comparing the voltage signal output by the first switch module with the driving voltage signal output by the first output end of the third switch module and outputting a corresponding second control signal;
the third comparison module is connected with the second output ends of the second switch module and the third switch module, and is used for comparing the voltage signal output by the second switch module with the driving voltage signal output by the second output end of the third switch module and outputting a corresponding third control signal; and
And the fourth switch module is connected with the power supply voltage source, the second comparison module and the third comparison module and is used for receiving the power supply voltage source signal, the second control signal and the third control signal and controlling the power supply voltage source signal to be turned on and turned off according to the second control signal and the third control signal.
Optionally, the first comparing module includes a first comparator, a first input end of the first comparator is used as a first input end of the first comparing module and is connected with the driving voltage source, a second input end of the first comparator is used as a second input end of the first comparing module and is connected with the threshold voltage source, and an output end of the first comparator is used as an output end of the first comparing module.
Optionally, the first switch module includes a first electronic switch tube, a current input end of the first electronic switch tube is used as an input end of the first switch module and is connected with the starting voltage signal source, a current output end of the first electronic switch tube is used as an output end of the first switch module and is connected with a first input end of the second comparison module, and a control end of the first electronic switch tube is used as a control end of the first switch module and is connected with an output end of the first comparison module.
Optionally, the second switch module includes a second electronic switch tube, a current input end of the second electronic switch tube is used as an input end of the second switch module and is connected with the closing voltage signal source, a current output end of the second electronic switch tube is used as an output end of the second switch module and is connected with a first input end of the third comparison module, and a control end of the second electronic switch tube is used as a control end of the second switch module and is connected with an output end of the first comparison module.
Optionally, the third switch module includes:
the current output end of the fifth electronic switching tube is used as a first output end of the third switching module and is connected with the second input end of the second comparison module; and
The current input end of the sixth electronic switch tube is connected with the current input end of the fifth electronic switch tube to serve as a driving voltage signal input end of the third switch module to be connected with the driving voltage source, the control end of the sixth electronic switch tube is connected with the control end of the fifth electronic switch tube to serve as a control signal input end of the third switch module to be connected with the output end of the first comparison module, and the current output end of the sixth electronic switch tube serves as a second output end of the third switch module to be connected with the second input end of the third comparison module.
Optionally, the second comparing module includes a second comparator, a first input end of the second comparator is used as a first input end of the second comparing module and connected with the output end of the first switch module, a second input end of the second comparator is used as a second input end of the second comparing module and connected with the first output end of the third switch module, and an output end of the second comparator is used as an output end of the second comparing module and connected with the first control signal input end of the fourth switch module.
Optionally, the third comparing module includes a third comparator, a first input end of the third comparator is used as a first input end of the third comparing module and is connected with an output end of the second switching module, a second input end of the third comparator is used as a second input end of the third comparing module and is connected with a second output end of the third switching module, and an output end of the third comparator is used as an output end of the third comparing module and is connected with a second control signal input end of the fourth switching module.
Optionally, the fourth switching module includes:
The current input end of the third electronic switching tube is used as the input end of the fourth switching module to be connected with the power supply voltage source, and the control end of the third electronic switching tube is used as the first control signal input end of the fourth switching module to be connected with the output end of the second comparison module;
The current input end of the fourth electronic switch tube is connected with the current output end of the third electronic switch tube, the control end of the fourth electronic switch tube is used as the second control signal input end of the fourth switch module to be connected with the output end of the third comparison module, and the current output end of the fourth electronic switch tube is used as the output end of the fourth switch module.
The embodiment of the application also provides a driving device, which comprises:
a driving voltage source;
A threshold voltage source;
Starting a voltage signal source;
closing a voltage signal source; and
The driving circuit according to any one of the above embodiments, wherein the driving circuit is connected to the driving voltage source, the threshold voltage source, the on voltage signal source, and the off voltage signal source, respectively.
Another embodiment of the present application also provides a display apparatus including:
A display panel; and
A control unit comprising a drive circuit as described in any one of the preceding claims.
The embodiment of the application provides a driving circuit, a driving device and a display device, wherein a comparison module is used for comparing a driving voltage signal with a threshold voltage and outputting a corresponding first control signal, a first switch module is used for controlling the on or off of an on voltage signal according to the first control signal, a second switch module is used for controlling the on or off of an off voltage signal according to the first control signal, a third switch module is used for selecting a first output end or a second output end according to the first control signal to output the driving voltage signal, and a fourth switch module is used for controlling the on and off of a power supply voltage source signal according to a second control signal output by the second comparison module and a third control signal output by the third comparison module, so that the output of the power supply voltage source signal is turned off in time when signals in a panel are abnormal, and the problem that a grid film driving chip works abnormally and a circuit is burnt is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a driving circuit according to an embodiment of the present application;
fig. 2 is a schematic diagram of a driving circuit according to another embodiment of the present application;
fig. 3 is a schematic structural diagram of a display device according to an embodiment of the application.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution of an embodiment of the present application will be clearly described below with reference to the accompanying drawings in the embodiment of the present application, and it is apparent that the described embodiment is a part of the embodiment of the present application, but not all the embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
The term "comprising" in the description of the application and the claims and in the above figures and any variants thereof is intended to cover a non-exclusive inclusion. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed but may optionally include additional steps or elements not listed or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used for distinguishing between different objects and not for describing a particular sequential order.
Fig. 1 is a schematic diagram of a driving circuit according to an embodiment of the application.
As shown in fig. 1, the driving circuit in the present embodiment is connected to a driving voltage source 31, a threshold voltage source 32, an on voltage signal source 33, and an off voltage signal source 34, and includes:
the first comparison module 11 is connected with the driving voltages 31 and the threshold voltage source 32, and is used for receiving the driving voltage signal, comparing the driving voltage signal with the threshold voltage and outputting a corresponding first control signal;
the first switch module 21 is connected to the on voltage signal source 33 and the first comparison module 11, and is configured to receive the on voltage signal and the first control signal, and control on or off of the on voltage signal according to the first control signal;
The second switch module 22 is connected with the closing voltage signal source 34 and the first comparison module 11, and is used for receiving the closing voltage signal and the first control signal and controlling the closing voltage signal to be turned on or turned off according to the first control signal;
the third switch module 23 is connected with the driving voltage source 31 and the first comparison module 11, the third switch module 23 comprises a first output end and a second output end, and the third switch module 23 is used for receiving the driving voltage signal and the first control signal and selecting the first output end or the second output end to output the driving voltage signal according to the first control signal;
The second comparing module 12 is connected to the first output ends of the first switch module 21 and the third switch module 23, and is configured to compare the voltage signal output by the first switch module 21 with the driving voltage signal output by the first output end of the third switch module 23, and output a corresponding second control signal;
The third comparing module 13 is connected to the second output ends of the second switch module 22 and the third switch module 23, and is configured to compare the voltage signal output by the second switch module 22 with the driving voltage signal output by the second output end of the third switch module 23, and output a corresponding third control signal; and
The fourth switch module 24 is connected to the power supply voltage source 35, the second comparison module 12, and the third comparison module 13, and is configured to receive the power supply voltage source signal, the second control signal, and the third control signal, and control on and off of the power supply voltage source signal according to the second control signal and the third control signal.
In one embodiment, the power management chip is used as the power supply voltage source 35, and the voltage of the power supply signal output by the power supply voltage source 35 is VDD.
In one embodiment, the signal output by the last row of scan lines in the gate film driving chip (G-COF) is used as the driving voltage source 31, and the voltage of the driving signal output by the driving voltage source 31 is V1.
In one embodiment, the on voltage signal output by the on voltage signal source 33 is VGH, the off voltage signal output by the off voltage signal source 34 is VGL, that is, the voltage VGH of the on voltage signal is taken as the gate on voltage on the printed circuit board, and the voltage VGL of the off voltage signal is taken as the gate off voltage on the printed circuit board.
In one embodiment, the voltage of the high voltage signal is VGH and the voltage of the low voltage signal is VGL when the gate thin film driving chip is operating normally.
In one embodiment, the threshold voltage source 32 may be a reference voltage set according to a user, specifically, the threshold voltage of the threshold voltage source 32 may be specifically set according to a user's requirement, and in this embodiment, the threshold voltage of the threshold voltage source 32 may be represented by GND.
In one embodiment, when the voltage signals of the first input end and the second input end of the first comparing module 11 are the same, the first control signal output by the first comparing module 11 is at a low level, when the voltage signal of the first input end of the first comparing module 11 is greater than the voltage signal of the second input end, the first control signal output by the first comparing module 11 is at a high level, and when the voltage signal of the first input end of the first comparing module 11 is less than the voltage signal of the second input end, the first control signal output by the first comparing module 11 is at a low level.
In one embodiment, when the voltage signals at the first input end and the second input end of the second comparison module 12 are the same, the second control signal output by the second comparison module 12 is at a low level, when the voltage signal at the first input end of the second comparison module 12 is greater than the voltage signal at the second input end, the second control signal output by the second comparison module 12 is at a high level, and when the voltage signal at the first input end of the second comparison module 12 is less than the voltage signal at the second input end, the second control signal output by the second comparison module 12 is at a low level.
In one embodiment, when the voltage signals of the first input end and the second input end of the third comparing module 13 are the same, the third control signal output by the third comparing module 13 is at a low level, when the voltage signal of the first input end of the third comparing module 13 is greater than the voltage signal of the second input end, the third control signal output by the third comparing module 13 is at a high level, and when the voltage signal of the first input end of the third comparing module 13 is less than the voltage signal of the second input end, the third control signal output by the third comparing module 13 is at a low level.
In one embodiment, when the system is in operation, when the driving voltage signal V1 output by the driving voltage source 31 is at a high level, the voltage of the driving voltage signal is greater than the threshold voltage GND, the first comparing module 11 outputs a high level, at this time, the first switching module 21 is turned on, the first output end of the third switching module 23 is set as a signal output end, the first output end of the third switching module 23 outputs the driving voltage signal V1, and the second output pipe of the third switching module 23 is turned off, so that the second input end of the third comparing module 13 is suspended, and because the second switching module 22 is also turned off, the first input end of the third comparing module 13 is also suspended, at this time, the third control signal output by the third comparing module 13 is at a low level. When the driving voltage signal V1 output by the driving voltage source 31 is normal, v1=vgh, the voltage of the on voltage signal input by the first input end of the second comparing module 12 is equal to the driving voltage signal input by the second input end, at this time, the second control signal output by the second comparing module 12 is at a low level, at this time, the fourth switching module 24 controls the power supply voltage source signal to be turned on according to the second control signal and the third control signal, and the system works normally.
In one embodiment, when the system is abnormal, the driving voltage signal V1 output by the driving voltage source 31 is smaller than the on voltage signal VGH, at this time, the second control signal output by the second comparing module 12 is at a high level, and the fourth switching module 24 controls the power supply voltage source signal to control the power supply voltage source signal to be turned off according to the second control signal and the third control signal, at this time, the power supply voltage source 35 stops outputting the power supply voltage source signal, so that the back-end circuit is prevented from being failed due to abnormal input signals.
In one embodiment, when the system is in operation, when the driving voltage signal V1 output by the driving voltage source 31 is at a low level, at this time, the voltage V1 of the driving voltage signal V1 is less than the threshold voltage GND, the first comparing module 11 outputs a low level, the first switching module 21 is turned off, the second output end of the third switching module 23 is used as the signal output end, the second switching module 22 is turned on, when the driving voltage signal V1 output by the driving voltage source 31 is normal, v1=gnd, the voltage of the off voltage signal input by the second input end of the second comparing module 12 is equal to the driving voltage signal input by the second input end, at this time, the second control signal output by the second comparing module 12 is at a low level, at this time, the fourth switching module 24 controls the power supply voltage source signal to be turned on according to the second control signal and the third control signal, and the system is in normal operation.
In one embodiment, when the system is abnormal, the driving voltage signal V1 output by the driving voltage source 31 is smaller than the shutdown voltage signal VGH, at this time, the second control signal output by the second comparing module 12 is at a high level, and the fourth switching module 24 controls the power supply voltage source signal to control the power supply voltage source signal to be turned off according to the second control signal and the third control signal, at this time, the power supply voltage source 35 stops outputting the power supply voltage source signal, so that the back-end circuit is prevented from being failed due to abnormal input signals.
In an embodiment, the supply voltage source 35 is arranged to supply the drive voltage source 31.
In one embodiment, the driving voltage source 31 is a gate thin film chip, and the voltage output by the gate thin film chip is compared with a preset standard voltage, where the preset standard voltage may be the voltage output by the threshold voltage source 32, and a ground short circuit occurs in the panel or an abnormal output voltage of the gate thin film chip occurs when the impedance is smaller, so when the standard voltage is not satisfied, the fourth switch module 24 is controlled to turn off the power supply input of the gate thin film chip, so as to avoid burning caused by foreign matters entering the panel.
In one embodiment, the driving voltage signal output by the gate thin film chip is set to turn on the thin film transistor in the display panel, the driving voltage signal may be set to turn on a high level of the thin film transistor or turn off a low level of the thin film transistor to realize the on or off of the thin film transistor, a voltage range of the high level and the low level meeting the on or off of the thin film transistor is larger, and the fluctuation of the voltage output by the gate thin film chip is also indicative of the abnormality in the panel, so that by detecting the voltage output by the gate thin film chip, and when the voltage output by the gate thin film chip does not meet the standard voltage, the fourth switch module 24 is controlled to turn off the power supply input of the gate thin film chip, thereby avoiding the occurrence of short circuit or the abnormality with small resistance in the display panel.
Fig. 2 is a schematic diagram of a driving circuit according to another embodiment of the application.
Referring to fig. 2, in one embodiment, the first comparing module 11 includes a first comparator D1, a first input terminal of the first comparator D1 is connected as a first input terminal of the first comparing module 11 to the driving voltage source 31, a second input terminal of the first comparator D1 is connected as a second input terminal of the first comparing module 11 to the threshold voltage source 32, and an output terminal of the first comparator D1 is used as an output terminal of the first comparing module 11.
In one embodiment, the first comparator D1 is a voltage comparator, the first input terminal of the first comparator D1 is an anode input terminal of the voltage comparator, and the second input terminal of the first comparator D1 is a cathode input terminal of the voltage comparator.
Referring to fig. 2, in one embodiment, the first switch module 21 includes a first electronic switch tube M1, a current input end of the first electronic switch tube M1 is connected as an input end of the first switch module 21 to the turn-on voltage signal source 33, a current output end of the first electronic switch tube M1 is connected as an output end of the first switch module 21 to the first input end of the second comparison module 12, and a control end of the first electronic switch tube M1 is connected as a control end of the first switch module 21 to the output end of the first comparison module 11.
Referring to fig. 2, in one embodiment, the second switching module 22 includes a second electronic switching tube M2, a current input end of the second electronic switching tube M2 is connected as an input end of the second switching module 22 to the off-voltage signal source 34, a current output end of the second electronic switching tube M2 is connected as an output end of the second switching module 22 to the first input end of the third comparing module 13, and a control end of the second electronic switching tube M2 is connected as a control end of the second switching module 22 to the output end of the first comparing module 11.
Referring to fig. 2, in one embodiment, the third switch module 23 includes:
A fifth electronic switching tube M5, wherein a current output end of the fifth electronic switching tube M5 is connected with a second input end of the second comparison module 12 as a first output end of the third switching module 23; and
The current input end of the sixth electronic switching tube M6 and the current input end of the fifth electronic switching tube M5 are connected as a driving voltage signal input end of the third switching module 23 and connected with the driving voltage source 31, the control end of the sixth electronic switching tube M6 and the control end of the fifth electronic switching tube M5 are connected as a control signal input end of the third switching module 23 and connected with the output end of the first comparison module 11, and the current output end of the sixth electronic switching tube M6 is connected as a second output end of the third switching module 23 and connected with the second input end of the third comparison module 13.
Referring to fig. 2, in one embodiment, the second comparing module 12 includes a second comparator D2, a first input terminal of the second comparator D2 is connected as a first input terminal of the second comparing module 12 to the output terminal of the first switching module 21, a second input terminal of the second comparator D2 is connected as a second input terminal of the second comparing module 12 to the first output terminal of the third switching module 23, and an output terminal of the second comparator 12 is connected as an output terminal of the second comparing module 12 to the first control signal input terminal of the fourth switching module 24.
Referring to fig. 2, in one embodiment, the third comparing module 13 includes a third comparator D3, a first input terminal of the third comparator D3 is connected as a first input terminal of the third comparing module 13 to the output terminal of the second switching module 23, a second input terminal of the third comparator D3 is connected as a second input terminal of the third comparing module 13 to the second output terminal of the third switching module 23, and an output terminal of the third comparator D3 is connected as an output terminal of the third comparing module 13 to the second control signal input terminal of the fourth switching module 24.
Referring to fig. 2, in one embodiment, the fourth switching module 24 includes:
The current input end of the third electronic switching tube M3 is used as the input end of the fourth switching module 24 to be connected with the power supply voltage source 35, and the control end of the third electronic switching tube M3 is used as the first control signal input end of the fourth switching module 24 to be connected with the output end of the second comparison module 12;
The current input end of the fourth electronic switching tube M4 is connected with the current output end of the third electronic switching tube M3, the control end of the fourth electronic switching tube M4 is used as the second control signal input end of the fourth switching module 24 to be connected with the output end of the third comparison module 13, and the current output end of the fourth electronic switching tube M4 is used as the output end of the fourth switching module 24.
In one embodiment, the first electronic switching tube M1 and the fifth electronic switching tube M5 are N-type MOS tubes, drain electrodes of the N-type MOS tubes serve as current input ends of the first electronic switching tube M1 and the fifth electronic switching tube M5, gate electrodes of the N-type MOS tubes serve as control ends of the first electronic switching tube M1 and the fifth electronic switching tube M5, and source electrodes of the N-type MOS tubes serve as current output ends of the first electronic switching tube M1 and the fifth electronic switching tube M5.
In one embodiment, the second electronic switching tube M2, the third electronic switching tube M3, the fourth electronic switching tube M4 and the sixth electronic switching tube M6 are P-type MOS tubes, the drain electrode of the P-type MOS tube is used as the current output end of the second electronic switching tube M2, the third electronic switching tube M3, the fourth electronic switching tube M4 and the sixth electronic switching tube M6, the gate electrode of the P-type MOS tube is used as the control end of the second electronic switching tube M2, the third electronic switching tube M3, the fourth electronic switching tube M4 and the sixth electronic switching tube M6, and the source electrode of the P-type MOS tube is used as the current input end of the second electronic switching tube M2, the third electronic switching tube M3, the fourth electronic switching tube M4 and the sixth electronic switching tube M6.
An embodiment of the present application also provides a driving apparatus including:
A driving voltage source 31;
a threshold voltage source 32;
Turning on the voltage signal source 33;
turning off the voltage signal source 34; and
The driving circuit of any of the above embodiments is connected to the driving voltage source 31, the threshold voltage source 32, the on voltage signal source 33, and the off voltage signal source 34, respectively.
Fig. 3 is a schematic structural diagram of a display device according to an embodiment of the application.
As shown in fig. 3, the display device in the present embodiment includes:
a display panel 60; and
A control unit 61, wherein the control unit 61 comprises a drive circuit 610 as any one of the above.
In one embodiment, the display device 60 may be any type of display device provided with the above-described driving circuit 610, such as a Liquid crystal display device (Liquid CRYSTAL DISPLAY, LCD), an organic light emitting display (Organic Electroluminesence Display, OLED) display device, a Quantum Dot LIGHT EMITTING Diodes (QLED) display device, or a curved display device.
In one embodiment, display panel 62 includes a pixel array comprised of a plurality of rows of pixels and a plurality of columns of pixels.
In one embodiment, the control unit 61 may be implemented by a general-purpose integrated Circuit, such as a central processing unit (Central Processing Unit, CPU), or by an Application SPECIFIC INTEGRATED Circuit (ASIC).
The embodiment of the application provides a driving circuit, a driving device and a display device, wherein a comparison module is used for comparing a driving voltage signal with a threshold voltage and outputting a corresponding first control signal, a first switch module is used for controlling the on or off of an on voltage signal according to the first control signal, a second switch module is used for controlling the on or off of an off voltage signal according to the first control signal, a third switch module is used for selecting a first output end or a second output end according to the first control signal to output the driving voltage signal, and a fourth switch module is used for controlling the on and off of a power supply voltage source signal according to a second control signal output by the second comparison module and a third control signal output by the third comparison module, so that the output of the power supply voltage source signal is turned off in time when signals in a panel are abnormal, and the problem that a grid film driving chip works abnormally and a circuit is burnt is avoided.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (10)
1. A driving circuit connected to a driving voltage source, a threshold voltage source, an on-voltage signal source, and an off-voltage signal source, comprising:
The first comparison module is connected with the driving voltage source and the threshold voltage source, and is used for receiving a driving voltage signal, comparing the driving voltage signal with the threshold voltage and outputting a corresponding first control signal; when the voltage signals of the first input end and the second input end of the first comparison module are the same, the first control signal output by the first comparison module is of a low level;
the first switch module is connected with the starting voltage signal source and the first comparison module, and is used for receiving the starting voltage signal and the first control signal and controlling the starting voltage signal to be turned on or turned off according to the first control signal;
the second switch module is connected with the closing voltage signal source and the first comparison module, and is used for receiving a closing voltage signal and the first control signal and controlling the closing voltage signal to be turned on or turned off according to the first control signal;
the third switch module is connected with the driving voltage source and the first comparison module, and comprises a first output end and a second output end, and is used for receiving the driving voltage signal and the first control signal, and selecting the first output end or the second output end to output the driving voltage signal according to the first control signal;
The second comparison module is connected with the first output ends of the first switch module and the third switch module, and is used for comparing the voltage signal output by the first switch module with the driving voltage signal output by the first output end of the third switch module and outputting a corresponding second control signal;
the third comparison module is connected with the second output ends of the second switch module and the third switch module, and is used for comparing the voltage signal output by the second switch module with the driving voltage signal output by the second output end of the third switch module and outputting a corresponding third control signal; and
And the fourth switch module is connected with the power supply voltage source, the second comparison module and the third comparison module and is used for receiving the power supply voltage source signal, the second control signal and the third control signal and controlling the power supply voltage source signal to be turned on and turned off according to the second control signal and the third control signal.
2. The driving circuit of claim 1, wherein the first comparison module comprises a first comparator, a first input of the first comparator is connected to the driving voltage source as a first input of the first comparison module, a second input of the first comparator is connected to a threshold voltage source as a second input of the first comparison module, and an output of the first comparator is the output of the first comparison module.
3. The driving circuit according to claim 1, wherein the first switching module includes a first electronic switching tube, a current input terminal of the first electronic switching tube is connected to the on-voltage signal source as an input terminal of the first switching module, a current output terminal of the first electronic switching tube is connected to a first input terminal of the second comparing module as an output terminal of the first switching module, and a control terminal of the first electronic switching tube is connected to an output terminal of the first comparing module as a control terminal of the first switching module.
4. The driving circuit according to claim 1, wherein the second switching module includes a second electronic switching tube, a current input terminal of the second electronic switching tube is connected to the off-voltage signal source as an input terminal of the second switching module, a current output terminal of the second electronic switching tube is connected to the first input terminal of the third comparing module as an output terminal of the second switching module, and a control terminal of the second electronic switching tube is connected to the output terminal of the first comparing module as a control terminal of the second switching module.
5. The drive circuit of claim 1, wherein the third switching module comprises:
the current output end of the fifth electronic switching tube is used as a first output end of the third switching module and is connected with the second input end of the second comparison module; and
The current input end of the sixth electronic switch tube is connected with the current input end of the fifth electronic switch tube to serve as a driving voltage signal input end of the third switch module to be connected with the driving voltage source, the control end of the sixth electronic switch tube is connected with the control end of the fifth electronic switch tube to serve as a control signal input end of the third switch module to be connected with the output end of the first comparison module, and the current output end of the sixth electronic switch tube serves as a second output end of the third switch module to be connected with the second input end of the third comparison module.
6. The driving circuit according to claim 1, wherein the second comparing module includes a second comparator, a first input terminal of the second comparator is connected as a first input terminal of the second comparing module to the output terminal of the first switching module, a second input terminal of the second comparator is connected as a second input terminal of the second comparing module to the first output terminal of the third switching module, and an output terminal of the second comparator is connected as an output terminal of the second comparing module to the first control signal input terminal of the fourth switching module.
7. The driving circuit according to claim 1, wherein the third comparing module includes a third comparator, a first input terminal of the third comparator is connected as a first input terminal of the third comparing module to the output terminal of the second switching module, a second input terminal of the third comparator is connected as a second input terminal of the third comparing module to the second output terminal of the third switching module, and an output terminal of the third comparator is connected as an output terminal of the third comparing module to the second control signal input terminal of the fourth switching module.
8. The drive circuit of claim 1, wherein the fourth switching module comprises:
The current input end of the third electronic switching tube is used as the input end of the fourth switching module to be connected with the power supply voltage source, and the control end of the third electronic switching tube is used as the first control signal input end of the fourth switching module to be connected with the output end of the second comparison module;
The current input end of the fourth electronic switch tube is connected with the current output end of the third electronic switch tube, the control end of the fourth electronic switch tube is used as the second control signal input end of the fourth switch module to be connected with the output end of the third comparison module, and the current output end of the fourth electronic switch tube is used as the output end of the fourth switch module.
9. A driving device, characterized in that the driving device comprises:
a driving voltage source;
A threshold voltage source;
Starting a voltage signal source;
closing a voltage signal source; and
The drive circuit of any one of claims 1-8, connected to the drive voltage source, the threshold voltage source, the on voltage signal source, and the off voltage signal source, respectively.
10. A display device, comprising:
A display panel; and
A control unit comprising a drive circuit as claimed in any one of claims 1 to 8.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811547518.1A CN109410878B (en) | 2018-12-18 | 2018-12-18 | Driving circuit, driving device and display device |
| US17/257,861 US11335290B2 (en) | 2018-12-18 | 2019-01-08 | Drive circuit, drive device and display device |
| PCT/CN2019/070824 WO2020124703A1 (en) | 2018-12-18 | 2019-01-08 | Driving circuit, driving device and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811547518.1A CN109410878B (en) | 2018-12-18 | 2018-12-18 | Driving circuit, driving device and display device |
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| CN109410878A CN109410878A (en) | 2019-03-01 |
| CN109410878B true CN109410878B (en) | 2024-05-03 |
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| CN110459181B (en) * | 2019-06-10 | 2021-08-06 | 重庆惠科金渝光电科技有限公司 | Detection circuit and detection method of display panel and display device |
| CN110534323A (en) * | 2019-09-27 | 2019-12-03 | 山东广域科技有限责任公司 | The three-phase transformer of on-load voltage regulation driving switch circuit and the application switching circuit |
| CN114363106B (en) * | 2020-09-29 | 2024-01-05 | 深圳英集芯科技股份有限公司 | Single-wire communication device, communication system, and single-wire communication method |
| CN112687221B (en) * | 2020-12-24 | 2024-04-05 | 厦门天马微电子有限公司 | Display module and display device |
| CN112951173B (en) * | 2021-02-04 | 2022-11-25 | 重庆先进光电显示技术研究院 | Grid opening voltage generation circuit, display panel driving device and display device |
| CN114283734B (en) * | 2022-01-28 | 2024-02-27 | 绵阳惠科光电科技有限公司 | Data driving protection circuit, device, display panel and display |
| CN115294923B (en) * | 2022-08-29 | 2023-11-21 | 惠科股份有限公司 | Voltage stabilizing circuit and display panel |
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