CN110459181A - A kind of circuit for detecting of display panel, method for detecting and display device - Google Patents
A kind of circuit for detecting of display panel, method for detecting and display device Download PDFInfo
- Publication number
- CN110459181A CN110459181A CN201910497920.1A CN201910497920A CN110459181A CN 110459181 A CN110459181 A CN 110459181A CN 201910497920 A CN201910497920 A CN 201910497920A CN 110459181 A CN110459181 A CN 110459181A
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- Prior art keywords
- control switch
- detecting
- comparison unit
- control
- display panel
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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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof
Abstract
This application discloses a kind of circuit for detecting of display panel and display devices, circuit for detecting includes: selection route, the first comparison unit and control device, the input terminal of selection route is connected to the output end of the grid drive chip last line of display panel, output end output detecting voltage and contrast potential；First comparison unit receives the detecting voltage and contrast potential of selection circuit output, relatively exports a signal voltage later；Control device control signal output element connects or disconnects；When detecting variation contrast potential, control device controls signal output element and disconnects；On the contrary, control device control signal output element connection.By the way that a circuit for detecting is arranged, the working condition of grid drive chip is detected, is abnormal and disconnects operating circuit in time, preventing from working in the case where grid drive chip exception leads to circuit burnout.
Description
Technical field
This application involves field of display technology more particularly to a kind of circuit for detecting of display panel, method for detecting and display
Device.
Background technique
(Thin Film Transistor Liquid Crystal Display, tft liquid crystal are aobvious by TFT-LCD
Show device) it is one of principal item of display panel, have become IT (InformationTechnology, information technology), view
Interrogate display platform important in product.The main driving principle of TFT-LCD is system board by R/G/B compressed signal, driving signal
And power supply is connected by wire rod with the connector on circuit board, data are by the TCON (Timing on circuit board
Controller, sequence controller) after chip processing, through circuit board, pass through S-COF (Source-Chip on Film, source level
Driving chip) and G-COF (Gate-Chip on Film, grid drive chip) connect with viewing area so that LCD obtain
Required power supply, signal.
During display panel work, it may be fallen into because of foreign matter and cause grid in the circuit of grid drive chip
Driving chip operation irregularity, if excluded not in time to abnormal, the operating circuit that will lead to display panel is burnt.
Summary of the invention
The purpose of the application is to provide the circuit for detecting, method for detecting and display device of a kind of display panel, prevents from showing
The operating circuit of panel is burnt.
This application discloses a kind of circuit for detecting of display panel, including selection route, the first comparison unit and control dress
It sets, the input terminal of the selection route is connected to the output end of the grid drive chip last line of the display panel, output
End output detecting voltage and contrast potential；The input terminal of first comparison unit is connect with the output end of the selection route,
The detecting voltage and contrast potential for receiving the selection circuit output, the detecting voltage is compared with the contrast potential
Compared with, relatively after export a signal voltage；The output end of the input terminal of the control device and first comparison unit connects
It connects, output end is connected on the signal output element, controls connecting or disconnecting for the signal output element；When the detecting
When the certain voltage value of contrast potential described in variation, the control device controls the signal output element and disconnects；On the contrary
Ground, the control device control the signal output element connection.
Optionally, the selection route include the second comparison unit and selecting module, second comparison unit it is in the same direction
Input terminal inputs the detecting voltage, and reverse input end ground connection, second comparison unit is by comparing noninverting input and instead
To the voltage of input terminal, a signal voltage is exported to the selecting module；The selecting module receives described second and compares dress
The signal voltage of output is set, corresponding detecting voltage is controlled and contrast potential is transported to the corresponding input of first comparison unit
End.
Optionally, the selecting module includes first choice module and the second selecting module, the first choice module and
The control terminal of second selecting module is both connected to the output end of second comparison unit；The contrast potential includes first
The input terminal of contrast potential and the second contrast potential, the first choice module inputs first contrast potential and the detecting
Voltage, by first contrast potential or it is described detecting voltage output to first comparison unit positive input；It is described
The input terminal of second selecting module inputs second contrast potential and the detecting voltage, by second contrast potential or institute
State the reverse input end for detecting voltage output to first comparison unit.
Optionally, the first choice module includes the first control switch and the second control switch, and first control is opened
It closes opposite with the second control switch control logic；The control terminal of first control switch and second control switch connects
It is connected to the output end of second comparison unit；The output end of first control switch and second control switch is connected to
The positive input of first comparison unit；The input terminal of first control switch inputs first contrast potential；Institute
The input terminal for stating the second control switch inputs the detecting voltage.
Optionally, the first choice module includes third control switch；The third control switch and first control
Switch control logic processed is identical；First control switch is connected to first comparison unit by the third control switch
Positive input；The control terminal of the third control switch is connected to the output end of second comparison unit.
Optionally, second selecting module includes the 4th control switch and the 5th control switch, and the 4th control is opened
It closes opposite with the 5th control switch control logic；The control terminal of 4th control switch and the 5th control switch connects
It is connected to the output end of second comparison unit；The output end of 4th control switch and the 5th control switch is connected to
The positive input of first comparison unit；The input terminal of 4th control switch inputs second contrast potential；Institute
The input terminal for stating the 5th control switch inputs the detecting voltage.
Optionally, second selecting module includes the 6th control switch；6th control switch and the 4th control
Switch control logic processed is identical；4th control switch is connected to first comparison unit by the 6th control switch
Positive input；The control terminal of 6th control switch is connected to the output end of second comparison unit.
Optionally, control device includes the 7th control switch, the control terminal of the 7th control switch and first ratio
Output end compared with device connects, and input terminal inputs a driving signal, the signal output element company of output end and the display panel
It connects.
Disclosed herein as well is a kind of method for detecting of display panel, comprising steps of
Voltage will be detected and contrast potential inputs the input terminal of the first comparison unit；
First comparison unit is compared detecting voltage and contrast potential；
When the certain voltage value of detecting variation contrast potential, the operating circuit that control device controls the display panel is disconnected
It opens.
Disclosed herein as well is a kind of display device, the circuit for detecting including display panel recited above.
The application detects the working condition of grid drive chip, when the first comparison unit by one circuit for detecting of setting
When determining the working condition exception of grid drive chip, the disconnection of signal output element is controlled by control device, is prevented
Only working in the case where grid drive chip exception leads to circuit burnout, to promote the quality of display panel.
Detailed description of the invention
Included attached drawing is used to provide that a further understanding of the embodiments of the present application, and which constitute one of specification
Point, for illustrating presently filed embodiment, and with verbal description come together to illustrate the principle of the application.Under it should be evident that
Attached drawing in the description of face is only some embodiments of the present application, for those of ordinary skill in the art, is not paying wound
Under the premise of the property made is laborious, it is also possible to obtain other drawings based on these drawings.In the accompanying drawings:
Fig. 1 is exemplary a kind of schematic diagram of display panel；
Fig. 2 is the schematic diagram of the display device of the embodiment of the application；
Fig. 3 is the schematic diagram of the circuit for detecting of the embodiment of the application；
Fig. 4 is the schematic diagram of the method for detecting of the embodiment of the application.
Wherein, 100, display panel；110, circuit board；111, sequence controller；120, source driving chip；130, grid
Driving chip；140, non-display area；150, viewing area；160, signal output element；170, power supply chip；180, operating circuit；
200, circuit for detecting；210, route is selected；211, first choice module；M1, the first control switch；M2, the second control switch；
M3, third control switch；212, the second selecting module；M4, the 4th control switch；M5, the 5th control switch；M6, the 6th control
Switch；220, the first comparison unit；230, the second comparison unit；240, control device；M7, the 7th control switch；300, it shows
Device.
Specific embodiment
It is to be appreciated that term used herein above, disclosed specific structure and function details, it is only for description
Specific embodiment is representative, but the application can be implemented by many alternative forms, be not construed as only
It is limited to the embodiments set forth herein.
In the description of the present application, term " first ", " second " are used for description purposes only, and it is opposite to should not be understood as instruction
Importance, or implicitly indicate the quantity of indicated technical characteristic.As a result, unless otherwise indicated, " first ", " are defined
Two " feature can explicitly or implicitly include one or more of the features；The meaning of " plurality " is two or two
More than.Term " includes " and its any deformation, mean and non-exclusive include, it is understood that there may be or addition is one or more that other are special
Sign, integer, step, operation, unit, component and/or combination thereof.
In addition, "center", " transverse direction ", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner",
The term of the orientation or positional relationship of the instructions such as "outside" is that orientation or relative positional relationship based on the figure describe, only
Be that the application simplifies description for ease of description, rather than indicate signified device or element must have a particular orientation,
It is constructed and operated in a specific orientation, therefore should not be understood as the limitation to the application.
Furthermore unless specifically defined or limited otherwise, term " installation ", " connected ", " connection " shall be understood in a broad sense, example
Such as it may be fixed connection or may be dismantle connection, or integral connection；It can be mechanical connection, be also possible to be electrically connected
It connects；It can be directly connected, it can also indirectly connected through an intermediary or the connection inside two elements.For ability
For the those of ordinary skill in domain, the concrete meaning of above-mentioned term in this application can be understood as the case may be.
Below with reference to the accompanying drawings the application is described further with optional embodiment.
As shown in Figure 1, display panel 100 include circuit board 110, it is source level driving chip 120, grid drive chip 130, non-
Viewing area 140 and viewing area 150, one end of the source driving chip 120 are connected on the circuit board 110, and opposite is another
One end is connected to the long side of the non-display area 140, and the grid drive chip 130 is connected to the short of the non-display area 140
Side is provided with sequence controller 111 on the circuit board 110, and data are after the processing of sequence controller 111, through circuit board 110
It is connect by source level driving chip 120 and grid drive chip 130 with viewing area 150, thus needed for obtaining display panel 100
Power supply and signal.
As shown in Figures 2 and 3, the embodiment of the present application discloses a kind of display device 300, and the display device 300 includes
Display panel 100, the display panel 100 is including power supply chip 170, grid drive chip 130 and for detecting the grid
The whether normal circuit for detecting 200 of 130 working condition of driving chip, the circuit for detecting 200 include selection route 210, first
Comparison unit 220, control device 240, the grid that the input terminal of the selection route 210 is connected to the display panel 100 drive
The output end of dynamic 130 last line of chip, output end output detecting voltage A and contrast potential；First comparison unit 220
Input terminal is connect with the output end of the selection route 210, receives detecting voltage A and comparison that the selection route 210 exports
Voltage is compared the detecting voltage A with the contrast potential, relatively exports a signal voltage later；The control
The control terminal of device 240 is connect with the output end of first comparison unit 220, and input terminal is connected to the power supply chip 170,
Output end is connected on the operating circuit 180 of the display panel 100, controls the operating circuit 180 of the display panel 100
It connects or disconnects；When the detecting voltage A deviates the contrast potential, the control device 240 controls the display panel
100 operating circuit 180 disconnects, and the display panel 100 stops working；On the contrary, the control device 240 controls described show
Show that the operating circuit 180 of panel 100 connects, the display panel 100 works normally.Specifically, first comparison unit 220
For comparator.
Because grid drive chip 130 is progressively scanned to last line, circuit for detecting 200 is arranged in gate driving
On the output end of 130 last line of chip, entire grid drive chip 130 can be detected, guarantees detecting in place.Display panel
Foreign matter may be fallen into 100 course of work, in the circuit of grid drive chip 130, and short circuit occurs so as to cause gate driving
The operation irregularity of chip 130, if do not excluded timely to abnormal, always with abnormality if work, Jiu Huizao
At burning for operating circuit 180, a circuit for detecting 200 is set, by selection route 210 to the corresponding line of different working condition
Road is connected to, and when the first comparison unit 220 determines the working condition exception of grid drive chip 130, passes through control
Device 240 processed disconnects to control the display panel 100 operating circuit 180, prevents in the case where 130 exception of grid drive chip
Working on leads to circuit burnout, to promote the quality of display panel 100.
Wherein, the selection route 210 includes the second comparison unit 230 and selecting module, each selecting module
Control terminal is both connected on the output end of second comparison unit 230, and the noninverting input of second comparison unit 230 is defeated
Enter the detecting voltage A, reverse input end is grounded (Ground, GND), and second comparison unit 230 is by comparing defeated in the same direction
The voltage for entering end and reverse input end exports a signal voltage to each selecting module.First with the second comparison unit 230
Judging to detect voltage A is the then output signal voltage to each selecting module for high pressure conditions or low-pressure state, and control is respectively
A selecting module is connected to corresponding working line, and such setting can automatically select corresponding route and work, and improves detecting
The detecting precision of route, it is more accurate to the abnormal judgement of grid drive chip 130.Grid are judged with the second comparison unit 230
130 last line of pole driving chip output detecting voltage A be high pressure conditions or low-pressure state, then export again a height,
Low voltage signal avoids selecting module from being directly connected to the output end of 130 last line of grid drive chip into selecting module,
The output end for preventing grid from driving 130 last line of chip connected multi-load to which the circuit to grid drive chip 130 generates
It influences.It is of course also possible to which selecting module to be directly connected to the output end of 130 last line of grid drive chip, can save
Material simplifies circuit.Specifically, second comparison unit 230 is comparator.
The control device 240 includes the 7th control switch M7, and the input terminal of the 7th control switch M7 is shown with described
Show the power supply chip connection of panel 100, output end is connect with the signal output element 160 of the display panel 100, the power supply
Chip exports a driving signal B and is output to the signal output element 160 by the 7th control switch M7, and the signal is defeated
Voltage needed for element 160 provides the operating circuit 180 of the display panel 100 out, the 7th control switch M7 control institute
Power supply chip is stated to connecting or disconnecting between the signal output element 160, the 7th control switch M7 is also attached to institute
State the output end of the first comparison unit 220.Pass through the first comparison unit 220 sentencing to the working condition of grid drive chip 130
Connection or disconnection disconnected and then that control the 7th control switch M7；When the 7th control switch M7 connection, the power supply core
The driving signal B of piece output can be for transmission to the signal output element 160 of the display panel 100, signal output element 160
Voltage needed for the operating circuit 180 of display panel 100 can be provided, operating circuit 180 work normally；When the 7th control is opened
When closing M7 disconnection, signal output element 160 can not receive the driving signal B of the power supply chip output, signal output element
160 just do not provide voltage, and operating circuit 180 stops working, so set, when 130 operation irregularity of grid drive chip,
First comparison unit 220, which can be judged immediately, to be made the 7th control open M7 shutdown to open, and allows the operating circuit of display panel 100
180 stop working, and preventing from working in the case where 130 exception of grid drive chip leads to circuit burnout, to be promoted aobvious
Show the quality of panel 100.
The contrast potential includes the first contrast potential V1 and the second contrast potential V2, the input of the selection route 210
The first comparison voltage V1 of end input, the second comparison voltage V2 and detecting voltage A, the selection route 210 carry out these voltages
The first comparison voltage V1 of output and detecting voltage A after selection, or the second comparison voltage V2 of output and detecting voltage A to first compare
Compared with device 230.Specifically, the first contrast potential V1 and the second contrast potential V2 is the thin of the display panel 100
The cut-in voltage VGH and closing voltage VGL of film transistor, when the detecting voltage A is high pressure, first comparison unit
220 noninverting inputs input the cut-in voltage VGH of the thin film transistor (TFT), and reverse input end inputs the detecting voltage A；Work as institute
When to state detecting voltage A be low pressure, 220 noninverting input of the first comparison unit inputs the detecting voltage A, reverse input end
Input the closing voltage VGL of the thin film transistor (TFT).Voltage is compared using the voltage carried in display panel 100, is not required to
Extension circuit provides contrast potential again, simplifies circuit for detecting 200, reduces 200 area occupied of circuit for detecting, to increase display
The display area of panel 100 promotes the quality of display panel 100.
More specifically, the selecting module includes first choice module 211 and the second selecting module 212, first choosing
The control terminal for selecting module 211 and second selecting module 212 is both connected to the output end of second comparison unit 230, institute
Stating first choice module 211 includes the first control switch M1 and the second control switch M2, the first control switch M1 and described
Second control switch M2 control logic is opposite；The first control switch M1 is connected with the control terminal of the second control switch M2
In the output end of second comparison unit 230；The output end of the first control switch M1 and the second control switch M2
It is connected to the positive input of first comparison unit 220；The input terminal input described first of the first control switch M1
Contrast potential V1；The input terminal of the second control switch M2 inputs the detecting voltage A.Certainly, the first choice module
211 can also be arranged third control switch M3, the third control switch M3 and the first control switch M1 control logic phase
Together；The first control switch M1 is defeated by the forward direction that the third control switch M3 is connected to first comparison unit 220
Enter end；The control terminal of the third control switch M3 is connected to the output end of second comparison unit 230.
Second selecting module 212 includes the 4th control switch M4 and the 5th control switch M5, and the 4th control is opened
It closes M4 and the 5th control switch M5 control logic is opposite；The 4th control switch M4's and the 5th control switch M5
Control terminal is connected to the output end of second comparison unit 230；The 4th control switch M4 and the 5th control switch
The output end of M5 is connected to the positive input of first comparison unit 220；The input terminal of the 4th control switch M4 is defeated
Enter the second contrast potential V2；The input terminal of the 5th control switch M5 inputs the detecting voltage A.Certainly, described
The 6th control switch M6, the 6th control switch M6 and the 4th control switch M4 can also be arranged in two selecting modules 212
Control logic is identical；The 4th control switch M4 is connected to first comparison unit by the 6th control switch M6
220 positive input；The control terminal of the 6th control switch M6 is connected to the output end of second comparison unit 230.
The signal voltage control that first choice module 211 and the second selecting module 212 are exported by the second comparison unit 230
The selection of 220 input voltage of the first comparison unit is realized in the disconnection or connection of the control switch, passes through the first control
Switch M1 and the 4th control switch M4 come select first comparison unit 220 be positive input input the first contrast potential V1
Or reverse input end inputs the second contrast potential V2, then passes through the second control switch M2, third control switch M3, the 5th again
Control switch M5 and the 6th control switch M6 come select first comparison unit 220 be positive input input detecting voltage A
Or reverse input end input detecting voltage A, by the way that two selecting modules are arranged, each selecting module is arranged three controls and opens
It closes, to select three voltages, the judgement of circuit for detecting 200 can be made more accurate, more effectively identify gate driving core
Whether piece 130 is abnormal, and preventing from working in the case where 130 exception of grid drive chip leads to circuit burnout.
As shown in figure 3, another embodiment as the application, discloses a kind of circuit for detecting 200 of display panel 100,
Including selection route 210, the first comparison unit 220, the second comparison unit 230 and control device 240, second comparison unit
230 noninverting input inputs the detecting voltage A, reverse input end ground connection；The selection route 210 compares dress including second
Set the 230, first control switch M1, the second control switch M2, third control switch M3, the 4th control switch M4, the 5th control open
M5 and the 6th control switch M6 is closed, 230 noninverting input of the second comparison unit inputs the detecting voltage A, reversed to input
End ground connection, each control switch is metal-oxide-semiconductor, the first control switch M1, third control switch M3 and the 5th control
Switch M5 is N-type metal-oxide-semiconductor, and the second control switch M2, the 4th control switch M4 and the 6th control switch M6 are p-type metal-oxide-semiconductor,
The control terminal of each metal-oxide-semiconductor is both connected to the output end of second comparison unit 230, the first control switch M1's
Input terminal inputs the cut-in voltage VGH of the thin film transistor (TFT) of the display panel 100, output end and the third control switch M3
Input terminal connection, the input terminal input detecting voltage A of the second control switch M2, the input terminal of the 4th control switch M4 is defeated
Enter the closing voltage VGL of the thin film transistor (TFT) of the display panel 100, the input terminal of input terminal and the 6th control switch M6
Connection, the input terminal input detecting voltage A of the 5th control switch M5；The noninverting input of first comparison unit 220
It is connect with the output end of the second control switch M2, third control switch M3, the reverse input end of input terminal and the described 5th
The output end connection of control switch M5, the 6th control switch M6；One end of the control device 240 and the display panel 100
Power supply chip connection, the other end connect with the operating circuit of the display panel 100, and the control device 240 includes the 7th
Control switch M7, the 7th control switch M7 are p-type metal-oxide-semiconductor, the control terminal and described first of the 7th control switch M7
The output end of comparison unit 220 connects, and the 7th control switch M7 is set to the power supply chip and the display panel
Between signal output element 160.
As shown in figure 4, another embodiment as the application, discloses a kind of method for detecting of display panel, including step
It is rapid:
S1, the input terminal that voltage and contrast potential the first comparison unit of input will be detected by selection route；
S2, the first comparison unit are compared detecting voltage and contrast potential；And
S3, when detecting variation contrast potential, operating circuit that control device controls the display panel disconnects.
It should be noted that the restriction for each step being related in this programme, in the premise for not influencing concrete scheme implementation
Under, it does not regard as being can be the step of making restriction to step sequencing, write on front what is first carried out, be also possible to
It executes, is possibly even performed simultaneously afterwards, as long as this programme can be implemented, all shall be regarded as belonging to the protection model of the application
It encloses.
The technical solution of the application can be widely applied to various display panels, such as twisted nematic (Twisted
Nematic, TN) display panel, plane conversion type (In-Plane Switching, IPS) display panel, vertical orientation type
(Vertical Alignment, VA) display panel, more quadrant vertical orientation type (Multi-Domain Vertical
Alignment, MVA) display panel, it is of course also possible to be other kinds of display panel, such as Organic Light Emitting Diode
(Organic Light-Emitting Diode, OLED) display panel, applicable above scheme.
The above content is combining specific optional embodiment to be further described to made by the application, cannot recognize
The specific implementation for determining the application is only limited to these instructions.For those of ordinary skill in the art to which this application belongs,
Without departing from the concept of this application, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to the application
Protection scope.
Claims (10)
1. a kind of circuit for detecting of display panel characterized by comprising
Route is selected, input terminal is connected to the output end of the grid drive chip last line of the display panel, and output end is defeated
Voltage and contrast potential are detected out；
First comparison unit, input terminal are connect with the output end of the selection route, receive the detecting of the selection circuit output
Voltage and contrast potential are compared the detecting voltage with the contrast potential, relatively export a signal voltage later；
And
Control device, control terminal are connect with the output end of first comparison unit, and input terminal inputs a driving signal；Output end
Be connected on the signal output element of the display panel, control the driving signal and the signal output element connection or
It disconnects；
When the contrast potential described in the detecting variation, the control device controls the driving signal and the signal is defeated
Element disconnects out；It is connect on the contrary, the control device controls the driving signal with the signal output element.
2. a kind of circuit for detecting of display panel as described in claim 1, which is characterized in that the selection route includes second
The noninverting input of comparison unit and selecting module, second comparison unit inputs the detecting voltage, and reverse input end connects
Ground, second comparison unit export a signal voltage to institute by comparing the voltage of noninverting input and reverse input end
State selecting module；The selecting module receives the signal voltage of the second comparison unit output, controls corresponding detecting voltage
The corresponding input terminal of first comparison unit is transported to contrast potential.
3. a kind of circuit for detecting of display panel as claimed in claim 2, which is characterized in that the selecting module includes first
The control terminal of selecting module and the second selecting module, the first choice module and second selecting module is both connected to described
The output end of second comparison unit；
The contrast potential includes the first contrast potential and the second contrast potential, and the input terminal of the first choice module inputs institute
The first contrast potential and the detecting voltage are stated, first contrast potential or the detecting voltage output are compared to described first
Compared with the positive input of device；
The input terminal of second selecting module inputs second contrast potential and the detecting voltage, and described second is compared
Voltage or it is described detecting voltage output to first comparison unit reverse input end.
4. a kind of circuit for detecting of display panel as claimed in claim 3, which is characterized in that the first choice module includes
First control switch and the second control switch, first control switch and the second control switch control logic are opposite；Institute
The control terminal for stating the first control switch and second control switch is connected to the output end of second comparison unit；Described
The output end of one control switch and second control switch is connected to the positive input of first comparison unit；Described
The input terminal of one control switch inputs first contrast potential；The input terminal of second control switch inputs the detecting electricity
Pressure.
5. a kind of circuit for detecting of display panel as claimed in claim 4, which is characterized in that the first choice module includes
Third control switch；The third control switch is identical with the first control switch control logic；First control switch
The positive input of first comparison unit is connected to by the third control switch；The control of the third control switch
End is connected to the output end of second comparison unit.
6. a kind of circuit for detecting of display panel as claimed in claim 3, which is characterized in that second selecting module includes
4th control switch and the 5th control switch, the 4th control switch and the 5th control switch control logic are opposite；Institute
The control terminal for stating the 4th control switch and the 5th control switch is connected to the output end of second comparison unit；Described
The output end of four control switches and the 5th control switch is connected to the positive input of first comparison unit；Described
The input terminal of four control switches inputs second contrast potential；The input terminal of 5th control switch inputs the detecting electricity
Pressure.
7. a kind of circuit for detecting of display panel as claimed in claim 6, which is characterized in that second selecting module includes
6th control switch；6th control switch is identical with the 4th control switch control logic；4th control switch
The positive input of first comparison unit is connected to by the 6th control switch；The control of 6th control switch
End is connected to the output end of second comparison unit.
8. a kind of circuit for detecting of display panel as described in claim 1, which is characterized in that control device includes the 7th control
Switch, the control terminal of the 7th control switch are connect with the output end of first comparison unit, one driving of input terminal input
Signal, output end are connect with the signal output element of the display panel.
9. a kind of method for detecting of display panel, which is characterized in that comprising steps of
Voltage will be detected by selection route and contrast potential inputs the input terminal of the first comparison unit；
First comparison unit is compared detecting voltage and contrast potential；And
When detecting variation contrast potential, the operating circuit that control device controls the display panel is disconnected.
10. a kind of display device, which is characterized in that the detecting including the display panel as described in claim 1 to 8 any one
Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910497920.1A CN110459181B (en) | 2019-06-10 | 2019-06-10 | Detection circuit and detection method of display panel and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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