CN108154833A - The output detection circuit and its method of a kind of gate driving circuit, display device - Google Patents
The output detection circuit and its method of a kind of gate driving circuit, display device Download PDFInfo
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- CN108154833A CN108154833A CN201810007401.8A CN201810007401A CN108154833A CN 108154833 A CN108154833 A CN 108154833A CN 201810007401 A CN201810007401 A CN 201810007401A CN 108154833 A CN108154833 A CN 108154833A
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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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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Abstract
Output detection circuit and its method, display device the embodiment of the invention discloses a kind of gate driving circuit, wherein, which includes：Including：Detect sub-circuit and multiple output control sub-circuits；Output control sub-circuit and shift register correspond, and each output control sub-circuit is connected with the signal output end of cabling and corresponding shift register, under the control of signal output end, the signal of signal output end to be provided to cabling；Sub-circuit is detected, is connect with cabling, for exporting the signal of the signal output end of all shift registers.The technical solution of the embodiment of the present invention controls signal of the sub-circuit by cabling to the signal output end of all shift registers of detection sub-circuit offer by output, it can quickly be found by the waveform for the output signal for detecting sub-circuit when GOA circuits show bad, undesirable position occurs.
Description
Technical field
The present embodiments relate to display technology fields, and in particular to a kind of output detection circuit of gate driving circuit and
Its method, display device.
Background technology
In recent years, flat-panel monitor, such as liquid crystal display panel of thin film transistor (Thin Film Transistor-
Liquid Crystal Display, TFT-LCD) and active matrix organic light-emitting diode display panel (Active Matrix
Organic Light Emitting Diode, AMOLED), light-weight due to having many advantages, such as, thickness is thin and low-power consumption, because
And it is widely used in the electronic products such as TV, mobile phone.
With the development of science and technology the display panel of high-resolution, narrow frame becomes the trend of development, occurs array thus
Substrate gate driving (Gate Driver on Array, GOA) technology, GOA technologies refer to will be for the GOA circuits of driven grid line
The technology of the effective display area domain both sides of array substrate in display panel is arranged on, wherein, in GOA circuits, including multiple displacements
Register.
The output signal of GOA circuits is to realize the key factor normally shown.Therefore we are shown not encountering GOA circuits
When good, need to measure the output signal of GOA circuits.Through inventor the study found that when GOA circuits show bad, due to
The quantity of shift register in GOA circuits is excessive, causes to be difficult to determine that undesirable position occurs.
Invention content
In order to solve the above-mentioned technical problem, an embodiment of the present invention provides a kind of output detection circuits of gate driving circuit
And its method, display device, for solving, when GOA circuits occur bad, since the quantity of shift register is excessive, to cause very
Hardly possible determines that undesirable position occurs.
On one side, an embodiment of the present invention provides a kind of output detection circuit of gate driving circuit, the grid drives
Dynamic circuit includes multiple shift registers, including：Detect sub-circuit and multiple output control sub-circuits；The output control son electricity
Road and shift register correspond；
Each output control sub-circuit, connects with the signal output end of cabling and corresponding shift register, in institute
Under the control for stating signal output end, the signal of the signal output end is provided to cabling；
The detection sub-circuit, connect with the cabling, for exporting the letter of the signal output end of all shift registers
Number.
Optionally, the output control sub-circuit includes：Switching transistor；
The control pole of the switching transistor and the first pole are connected with the signal output end of corresponding shift register, and second
Pole is connect with cabling.
Optionally, the switching transistor includes：N-type TFT or N-type metal oxide semiconductor field-effect are brilliant
Body pipe.
Optionally, the threshold voltage of the switching transistor is less than the output signal of the signal output end of shift register
Current potential.
Optionally, the switching transistor is opened when the output signal of the signal output end of shift register is high level
It opens, is provided to cabling by the output signal.
Optionally, the detection sub-circuit includes electrode.
On the other hand, the embodiment of the present invention also provides a kind of display device, including gate driving circuit and above-mentioned grid
The output detection circuit of driving circuit.
On the other hand, the embodiment of the present invention also provides a kind of output detecting method of gate driving circuit, applied to above-mentioned
Gate driving circuit output detection circuit in, including：
Under the control of the signal output end of corresponding shift register, each output controls sub-circuit to cabling offer pair
The signal of the signal output end for the shift register answered；
Detect the signal that sub-circuit exports the signal output end of all shift registers.
Optionally, under the control of the signal output end in corresponding shift register, each output control sub-circuit
The signal that the signal output end of corresponding shift register is provided to cabling includes：
Each output control sub-circuit is when the signal of the signal output end of corresponding shift register is high level, to walking
Line provides the signal of the signal output end of corresponding shift register.
The output detection circuit and its method of gate driving circuit provided in an embodiment of the present invention, display device, wherein, it should
Circuit includes：Detect sub-circuit and multiple output control sub-circuits；Output control sub-circuit and shift register correspond, often
A output control sub-circuit, connects with the signal output end of cabling and corresponding shift register, in signal output end
Under control, the signal of signal output end is provided to cabling；Sub-circuit is detected, is connect with cabling, for exporting all shift LDs
The signal of the signal output end of device.The technical solution of the embodiment of the present invention controls sub-circuit to detection by cabling by output
Circuit provides the signal of the signal output end of all shift registers, can be fast by the waveform for the output signal for detecting sub-circuit
It is found promptly when GOA circuits show bad, undesirable position occurs.
Certainly, implement any of the products of the present invention or method it is not absolutely required at the same reach all the above excellent
Point.Other features and advantages of the present invention will illustrate in subsequent specification embodiment, also, partly implement from specification
It becomes apparent in example or is understood by implementing the present invention.The purpose of the embodiment of the present invention and other advantages can pass through
Specifically noted structure is realized and is obtained in specification, claims and attached drawing.
Description of the drawings
Attached drawing is used for providing further understanding technical solution of the embodiment of the present invention, and one of constitution instruction
Point, for explaining the technical solution of the embodiment of the present invention together with embodiments herein, do not form to the embodiment of the present invention
The limitation of technical solution.
Fig. 1 is the structure diagram one of the output detection circuit of gate driving circuit provided in an embodiment of the present invention：
Fig. 2 is the structure diagram two of the output detection circuit of gate driving circuit provided in an embodiment of the present invention；
Fig. 3 is the equivalent circuit diagram of the output detection circuit of gate driving circuit provided in an embodiment of the present invention；
Fig. 4 is the working timing figure of shift register；
Fig. 5 is the schematic diagram of the waveform of the output signal of detection sub-circuit provided in an embodiment of the present invention；
Fig. 6 is the flow chart of the output detecting method of gate driving circuit provided in an embodiment of the present invention；
Fig. 7 is the structure diagram of display device provided in an embodiment of the present invention.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are more clearly understood, below in conjunction with attached drawing pair
The embodiment of the embodiment of the present invention is described in detail.It should be noted that in the absence of conflict, the implementation in the application
Feature in example and embodiment mutually can be combined arbitrarily.
Unless otherwise defined, the embodiment of the present invention discloses the technical term used or scientific terminology should be institute of the present invention
The ordinary meaning that the personage with general technical ability is understood in category field." first ", " second " used in the embodiment of the present invention
And similar word is not offered as any sequence, quantity or importance, and be used only to distinguish different component parts.
The element or flase drop that the similar word such as " comprising " or "comprising" goes out always before the word, which are covered, appears in the word presented hereinafter
Element either object and its equivalent and be not excluded for other elements or object.The similar word such as " connection " or " connected "
Physics or mechanical connection is not limited to, but electrical connection can be included, it is either directly or indirect.
It will be understood by those skilled in the art that the switching transistor used in all embodiments of the application all can be film
Transistor or field-effect tube or the identical device of other characteristics.Preferably, the thin film transistor (TFT) used in the embodiment of the present invention can
To be oxide semi conductor transistor.Due to use here the source electrode of switching transistor, drain electrode be symmetrical, so its source
Pole, drain electrode can be interchanged.In embodiments of the present invention, to distinguish the two poles of the earth of switching transistor in addition to grid, by one of them
Electrode is known as the first pole, and another electrode is known as the second pole, and first extremely can be source electrode or drain electrode, second extremely can be drain electrode or
Source electrode.
Embodiment one
Fig. 1 is the structure diagram one of the output detection circuit of gate driving circuit provided in an embodiment of the present invention, such as Fig. 1
Shown, gate driving circuit includes multiple shift registers, and the output detection circuit of the gate driving circuit includes：Detection son electricity
Road and multiple output control sub-circuits；Output control sub-circuit and shift register correspond.
In the present embodiment, each output control sub-circuit, with cabling and the signal output end of corresponding shift register
Connection, under the control of signal output end, the signal of signal output end to be provided to cabling.Specifically, as shown in Figure 1,
N-1 output control sub-circuit is connect with the signal output end OUTPUT (N-1) of N-1 grades of shift registers, for cabling
The signal of OUTPUT (N-1) is provided；The signal output end OUTPUT of n-th output control sub-circuit and N grades of shift registers
(N) it connects, for providing the signal of OUTPUT (N) to cabling；And so on.
Sub-circuit is detected, is connect with cabling, for exporting the signal of the signal output end of all shift registers.
Optionally, the cabling of each output control sub-circuit connection is same cabling.
It should be noted that Fig. 2 is the structure of the output detection circuit of gate driving circuit provided in an embodiment of the present invention
Schematic diagram two, the cascade system of multiple shift registers of gate driving circuit can be with as shown in Figure 1, i.e. N+1 grades displacements be posted
The signal output end OUTPUT (N+1) of storage is connect with the reset signal end RESET of N grades of shift registers, can also be such as
Shown in Fig. 2, i.e., the signal input part of the signal output end OUTPUT (N) of N grades shift registers and N+1 grades of shift registers
INPUT connections, the reset signal of the signal output end OUTPUT (N+1) of N+1 grades of shift registers and N grades of shift registers
RESET connections are held, the signal input part of first order shift register is connect with initial signal input terminal STV.
In the present embodiment, when gate driving circuit progressively scans, when next line is opened, lastrow is necessarily closed,
In the same time, only there are one the signal output end output signals of shift register, then in the time of a frame, detects son electricity
Road will detect the signal from the first order shift register signal output end of level-one shift register to the end, these signals
Mutually without superposition, do not interfere.In addition, the shift register in gate driving circuit is to be sequentially output, therefore, under normal circumstances
The waveform of output signal that detection sub-circuit obtains is continuous.
The output detection circuit of gate driving circuit provided in an embodiment of the present invention, including：Detect sub-circuit and multiple defeated
Go out to control sub-circuit；Output control sub-circuit and shift register correspond, each output control sub-circuit, with cabling and right
The signal output end connection for the shift register answered, under the control of signal output end, signal output end to be provided to cabling
Signal；Sub-circuit is detected, is connect with cabling, for exporting the signal of the signal output end of all shift registers.The present invention
The technical solution of embodiment controls letter of the sub-circuit by cabling to all shift registers of detection sub-circuit offer by output
The signal of number output terminal, can quickly be found by the waveform for the output signal for detecting sub-circuit when GOA circuits show it is bad
When, undesirable position occurs.
Optionally, Fig. 3 is the equivalent circuit diagram of the output detection circuit of gate driving circuit provided in an embodiment of the present invention,
As shown in figure 3, output control sub-circuit includes：Switching transistor；The control pole of switching transistor M and the first pole and corresponding shifting
The signal output end connection of bit register, the second pole is connect with cabling.As shown in figure 3, in the N-1 output control sub-circuit
The control pole of switching transistor M (N-1) and the first pole and the signal output end OUTPUT (N-1) of N-1 Ghandler motion bit registers connect
It connects；The control pole of switching transistor M (N) in n-th output control sub-circuit and the first pole and the letter of N Ghandler motion bit registers
Number output terminal OUTPUT (N) connections, and so on.
Specifically, when the signal of the signal output end of shift register is high level, switching transistor is opened, the displacement
The signal of the signal output end of register is transmitted to by cabling on detection sub-circuit.
Optionally, switching transistor includes：N-type TFT or N-type mos field effect transistor.
Optionally, the threshold voltage of switching transistor is less than the current potential of the signal of the signal output end of shift register.It needs
It is noted that ideal waveform, the threshold voltage of switching transistor should be big as far as possible and surpass in order to obtain
The current potential of the signal of the signal output end of shift register is crossed, if threshold voltage is smaller, the letter of signal output end can not be filtered out
Noise signal before and after number, and noise can impact the obtained waveform of the output signal of detection sub-circuit；If its threshold value
Voltage is larger, then switching transistor can not open, and detection sub-circuit can not obtain the waveform of detection sub-circuit output signal；This
Outside, larger threshold voltage can also prevent other signals from avoiding the presence of switching transistor to being turned off capable influence and causing
Electric leakage.
Optionally, detection sub-circuit includes electrode.
Specifically, the cabling that connection control sub-circuit is connected leads to setting electrode at pad.
It is to be understood that the shift register in gate driving circuit includes：First power end VDD, second source end
VSS, third power end VGL, signal input part INPUT, signal output end OUTPUT, reset signal end RESET, clock signal terminal
CLK, input sub-circuit, output sub-circuit, reset subcircuit and noise reduction sub-circuit.
Optionally, sub-circuit is inputted, is connect with signal input part, the first power end and first node PD, in signal
Under the control of input terminal, the signal of the first power end is provided to first node.
Optionally, sub-circuit is exported, is connect with clock signal terminal, first node and signal output end, in first segment
Under the control of point, the clock signal of clock signal terminal is provided to signal output end.
Optionally, reset subcircuit, with reset signal end, first node, signal output end, second source end and third electricity
Source connects, under the control at reset signal end, the signal at second source end being provided to first node, to signal output end
The signal of third power end is provided；
Optionally, noise reduction sub-circuit is connect with clock signal terminal, first node, signal output end and third power end, is used
In under the control of clock signal terminal, the signal of third power end is provided to first node and signal output end.
It should be noted that the description above merely illustrates a kind of frame mode of shift register, the present invention is implemented
Example does not limit the concrete structure of shift register.
Fig. 4 is the working timing figure of shift register, with reference to Fig. 3-4, illustrates grid provided in an embodiment of the present invention
The operation principle of the output detection circuit of driving circuit.
For N-1 grades of shift registers, as the signal output end OUTPUT (N-1) of N-1 grades of shift registers
During output signal, the signal of the signal output end of N-1 grades of shift registers is high level, and switching transistor M (N-1) is beaten at this time
It opens, the signal of the signal output end of N-1 grades of shift registers is transmitted to electrode by cabling；N-1 grades of shift registers are defeated
After going out, the signal output end output signal of N grades of shift registers, at this time switching transistor M (N) open, N grade shift
The signal of the signal output end of register is transmitted to electrode by cabling；In addition, the signal output end due to this grade connects N-1
The reset signal end RESET of grade, makes the signal output end of N-1 grades of shift registers be pulled down rapidly, stops output, and switch is brilliant
Body pipe M (N-1) is closed；Equally, after N grades of shift register outputs, the signal output end of N+1 grades of shift registers is defeated
Go out signal, switching transistor M (N+1) is opened at this time, and the signal of the signal output end of N+1 shift registers is transmitted by cabling
To electrode；And so on, what electrode obtained is the signal of the signal output end of all shift registers in gate driving circuit
It integrates.
Fig. 5 is the schematic diagram of the waveform of the output signal of detection sub-circuit provided in an embodiment of the present invention, works as gate driving
When circuit progressively scans, when next line is opened, lastrow is necessarily closed, and in the same time, only there are one the letters of shift register
Number output terminal output signal, then within a scan period, detect the waveform of the output signal of sub-circuit as shown in figure 5, reason
The waveform for thinking output signal under state is a smooth high level.If the output signal of a certain shift register is abnormal,
An abnormal point can be embodied in the waveform of output signal, according to the position of this abnormal point and corresponding time, you can rapid
Learn the position that undesirable shift register occurs.
In addition, it is necessary to explanation, due to resistance and the influence of the delay of capacitance generation, the letter of practical shift register
It is stringent square wave that the signal of number output terminal, which is not, but has certain rising edge and failing edge time, therefore detects sub-circuit
The waveform of obtained output signal has certain fluctuation nor stringent high level.But in general, due to each shifting
The signal of the signal output end of bit register is basically identical, and the waveform of output signal that detection sub-circuit obtains is then a cycle
Property waveform, each period is the signal of the signal output end of each shift register cell, if existing abnormal, can be led to
It crosses in the waveform of output signal and significantly notes abnormalities a little.
Embodiment two
Inventive concept based on above-described embodiment, Fig. 6 are that the output of gate driving circuit provided in an embodiment of the present invention is examined
The flow chart of survey method, the output detecting method of gate driving circuit provided in an embodiment of the present invention are carried applied to embodiment one
In the output detection circuit of the gate driving circuit of confession, as shown in fig. 6, this method specifically includes following steps：
Step 100, under the control of the signal output end of corresponding shift register, each output control sub-circuit is to walking
Line provides the signal of the signal output end of corresponding shift register.
Specifically, step 100 includes：Each output controls sub-circuit in the signal output end of corresponding shift register
When signal is high level, the signal of the signal output end of corresponding shift register is provided to cabling.
Step 200, detection sub-circuit export the signal of the signal output end of all shift registers.
Specifically, when gate driving circuit progressively scans, when next line is opened, lastrow is necessarily closed, same
Time, only there are one the signal output end output signals of shift register, then within a scan period, detects sub-circuit
The waveform of output signal is as shown in figure 5, ideally the waveform of output signal is a smooth high level.If a certain shifting
The output signal of bit register is abnormal, then an abnormal point can be embodied in the waveform of output signal, according to this abnormal point
Position and corresponding time, you can learn the position that undesirable shift register occurs rapidly.
In addition, it is necessary to explanation, due to resistance and the influence of the delay of capacitance generation, the letter of practical shift register
It is stringent square wave that the signal of number output terminal, which is not, but has certain rising edge and failing edge time, therefore detects sub-circuit
The waveform of obtained output signal has certain fluctuation nor stringent high level.But in general, due to each shifting
The signal of the signal output end of bit register is basically identical, and the waveform of output signal that detection sub-circuit obtains is then a cycle
Property waveform, each period is the signal of the signal output end of each shift register cell, if existing abnormal, can be led to
It crosses in the waveform of output signal and significantly notes abnormalities a little.
The output detecting method of gate driving circuit provided in an embodiment of the present invention applies the output in gate driving circuit
In detection circuit, including：Under the control of the signal output end of corresponding shift register, each output control sub-circuit is to walking
Line provides the signal of the signal output end of corresponding shift register；The signal for detecting all shift registers of sub-circuit output is defeated
The signal of outlet；The technical solution of the embodiment of the present invention controls sub-circuit to provide institute to detection sub-circuit by cabling by output
There is the signal of the signal output end of shift register, can quickly be found and worked as by the waveform for the output signal for detecting sub-circuit
When GOA circuits show bad, undesirable position occurs.
Embodiment three
Inventive concept based on above-described embodiment, Fig. 7 are the structure diagram of display device provided in an embodiment of the present invention,
As shown in fig. 7, display device provided in an embodiment of the present invention includes：The output inspection of gate driving circuit 10 and gate driving circuit
Slowdown monitoring circuit 20.
Wherein, the output detection circuit of the gate driving circuit in the embodiment of the present invention drives for the grid that embodiment one provides
The output detection circuit of dynamic circuit, realization principle is similar with effect is realized, details are not described herein.
As shown in fig. 7, display device includes display area AA and non-display area, the output of the gate driving circuit detects
Circuit 20 and gate driving circuit 10 are arranged at non-display area.
Preferably, which can be：Oled panel, mobile phone, tablet computer, television set, display, notebook electricity
Any product or component with display function such as brain, Digital Frame, navigator.There is the following to need to illustrate：
Attached drawing of the embodiment of the present invention pertain only to the present embodiments relate to structure, other structures, which can refer to, usually to be set
Meter.
In the absence of conflict, the feature in the embodiment of the present invention, that is, embodiment can be combined with each other new to obtain
Embodiment.
Although the embodiment disclosed by the embodiment of the present invention is as above, only the present invention is real for ease of understanding for the content
The embodiment applied example and used is not limited to the embodiment of the present invention.Skill in any fields of the embodiment of the present invention
Art personnel, can be in the form and details of implementation under the premise of the spirit and scope disclosed by the embodiment of the present invention are not departed from
It is upper to carry out any modification and variation, but the scope of patent protection of the embodiment of the present invention, it still must be with appended claims institute
Subject to the range defined.
Claims (9)
1. a kind of output detection circuit of gate driving circuit, the gate driving circuit includes multiple shift registers, special
Sign is, including：Detect sub-circuit and multiple output control sub-circuits；The output control sub-circuit and shift register are one by one
It is corresponding；
Each output control sub-circuit, connects with the signal output end of cabling and corresponding shift register, in the letter
Under the control of number output terminal, the signal of the signal output end is provided to cabling；
The detection sub-circuit, connect with the cabling, for exporting the signal of the signal output end of all shift registers.
2. output detection circuit according to claim 1, which is characterized in that the output control sub-circuit includes：Switch
Transistor；
The control pole of the switching transistor and the first pole are connected with the signal output end of corresponding shift register, the second pole with
Cabling connects.
3. output detection circuit according to claim 3, which is characterized in that the switching transistor includes：N-type film is brilliant
Body pipe or N-type mos field effect transistor.
4. according to any output detection circuits of claim 1-3, which is characterized in that the threshold value electricity of the switching transistor
Pressure is less than the current potential of the output signal of the signal output end of shift register.
5. output detection circuit according to claim 4, which is characterized in that the switching transistor is in shift register
The output signal of signal output end is opened when being high level, is provided to cabling by the output signal.
6. output detection circuit according to claim 1, which is characterized in that the detection sub-circuit includes electrode.
A kind of 7. display device, which is characterized in that the grid including gate driving circuit and as described in claim 1-6 is any
The output detection circuit of pole driving circuit.
8. a kind of output detecting method of gate driving circuit, which is characterized in that applied to as described in claim 1-6 is any
In the output detection circuit of gate driving circuit, including；
Under the control of the signal output end of corresponding shift register, each output control sub-circuit provides corresponding to cabling
The signal of the signal output end of shift register；
Detect the signal that sub-circuit exports the signal output end of all shift registers.
9. the according to the method described in claim 8, it is characterized in that, signal output end in corresponding shift register
Under control, the signal of signal output end that each output control sub-circuit provides corresponding shift register to cabling includes：
Each output control sub-circuit is carried when the signal of the signal output end of corresponding shift register is high level to cabling
For the signal of the signal output end of corresponding shift register.
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| CN108877682A (en) * | 2018-07-18 | 2018-11-23 | 京东方科技集团股份有限公司 | A kind of shift register and its driving method, gate driving circuit |
| CN109147630A (en) * | 2018-09-25 | 2019-01-04 | 武汉华星光电半导体显示技术有限公司 | A kind of GOA detection circuit and its test method |
| CN110379344A (en) * | 2019-09-03 | 2019-10-25 | 福建华佳彩有限公司 | GOA driving circuit detection method |
| CN110796975A (en) * | 2019-11-25 | 2020-02-14 | Tcl华星光电技术有限公司 | Display panel and display device |
| CN114627786A (en) * | 2022-03-22 | 2022-06-14 | 武汉天马微电子有限公司 | Display panel, signal detection method and electronic equipment |
| WO2023098194A1 (en) * | 2021-11-30 | 2023-06-08 | 荣耀终端有限公司 | Display screen and electronic device |
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| CN110379344A (en) * | 2019-09-03 | 2019-10-25 | 福建华佳彩有限公司 | GOA driving circuit detection method |
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