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CN106847143A - Detection circuit and display device - Google Patents

Detection circuit and display device Download PDF

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Publication number
CN106847143A
CN106847143A CN201710123785.5A CN201710123785A CN106847143A CN 106847143 A CN106847143 A CN 106847143A CN 201710123785 A CN201710123785 A CN 201710123785A CN 106847143 A CN106847143 A CN 106847143A
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China
Prior art keywords
voltage
display device
detection circuit
comparator
reset signal
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CN201710123785.5A
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CN106847143B (en
Inventor
马录俊
王立明
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InfoVision Optoelectronics Kunshan Co Ltd
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InfoVision Optoelectronics Kunshan Co Ltd
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention discloses detection circuit and display device, detection circuit includes voltage generating module and logic module, and voltage generating module includes:Voltage-stablizer, the DC voltage in its input receiving and displaying device, its output end provides the voltage of voltage regulation of DC voltage;Divider, its input is connected with the output end of voltage-stablizer, for carrying out partial pressure to obtain the first reference voltage to voltage of voltage regulation, first reference voltage is exported by the output end of divider, logic module is used to provide all reset signal according to the comparative result of DC voltage and the first reference voltage, when display device performs power-off operation, all reset signal is effective, drive element of the grid in display device is under the control of effective all reset signal while gating each pixel cell in display panel, so as to avoid detecting all reset signal of circuit output error under the influence of interference signal, prevent display device from occurring abnormal, the antijamming capability of detection circuit and the stability of display device are improve to a certain extent.

Description

Detection circuit and display device
Technical field
The present invention relates to display technology field, more particularly, to detection circuit and display device.
Background technology
Traditional display device includes drive circuit and display panel, wherein, display panel is included by multiple pixel cells The pel array of composition, drive circuit is used to drive display panel.In general, each pixel cell mainly includes film crystal Pipe (Thin-film Transistor, TFT), pixel electrode and public electrode.When display device normally shows, can be in electricity Stored charge is extremely gone up, so as to when display device is shut down and powered off, these electric charges on electrode of accumulation can allow corresponding pixel list Unit has different gray scale states, causes display panel the image of residual occur.
In order to solve the above problems, prior art is added ghost and eliminates function in a display device, i.e.,:When display device connects After receiving off signal, drive circuit exports the drive signal of high level to all of pixel cell in display panel simultaneously, makes Each pixel cell obtained in display panel is gated simultaneously, so that forcibly by accumulation on electrode in each pixel cell Electric charge is discharged by quick neutralization, and the purpose of ghost is eliminated to reach.
Prior art is mainly by the grid drive chip of drive circuit, power management chip or electrical level transferring chip Insert a ghost and eliminate functional unit, the unit passes through a voltage in a pin receiving and displaying device of chip, and The working condition (shutdown off-position/normal display state) of display device is judged according to the voltage, so as to according to the work shape State produces all reset signal to control other units in drive circuit so that all pixels unit in display panel is driven Moving cell is gated.However, the influence of interference signal is highly susceptible to due to the signal on the pin, therefore ghost eliminates function list The all reset signal of first possible output error, causes the unstable working condition of display device.
The content of the invention
In order to solve the problems, such as above-mentioned prior art, the present invention provides a kind of detection circuit and display device, with biography The display device of system is compared, and the display device and detection circuit that the present invention is provided have stronger antijamming capability, it is to avoid Quan Fu There is the state of mistake in position signal.
According to an aspect of the present invention, there is provided a kind of detection circuit for display device, it is characterised in that the inspection Slowdown monitoring circuit includes voltage generating module and logic module, wherein, the voltage generating module includes:Voltage-stablizer, its input termination The DC voltage in the display device is received, its output end provides the voltage of voltage regulation of the DC voltage;And divider, its is defeated Enter end to be connected with the output end of the voltage-stablizer, for carrying out partial pressure to the voltage of voltage regulation to obtain the first reference voltage, institute The first reference voltage is stated to be exported by the output end of the divider;The logic module is used for according to the DC voltage and described The comparative result of the first reference voltage provides all reset signal;When the display device performs power-off operation, all reset Signal is effective.
Preferably, the logic module includes:Sample circuit, it samples to obtain sampled voltage to the DC voltage; First comparator, it produces first detection signal according to the DC voltage and first reference voltage;Second comparator, its Second detection signal is produced according to the sampled voltage and the second reference voltage;And gate circuit, it is according to the described first detection Signal and second detection signal produce all reset signal.
Preferably, the positive input terminal of the first comparator receives first reference voltage, the first comparator Negative input end receives the DC voltage, and the feeder ear of the first comparator receives the voltage of voltage regulation, and described first compares The output end of device provides the first detection signal, and the positive input terminal of second comparator receives second reference voltage, The negative input end of second comparator receives the sampled voltage, and the feeder ear of second comparator receives the voltage stabilizing electricity Pressure, the output end of second comparator provides second detection signal, the gate circuit to the first detection signal and Second detection signal is carried out with computing to obtain all reset signal, and all reset signal is effective when being high level.
Preferably, when the display device is in normal operating conditions, second reference voltage is less than the sampling Voltage.
Preferably, the sample circuit includes the first resistor being connected between the DC voltage and ground and the second electricity Resistance, the node between the first resistor and the second resistance exports the sampled voltage.
Preferably, the first resistor and the second resistance are off chip resistor.
Preferably, the logic module includes the 3rd comparator, the feeder ear and the voltage-stablizer of the 3rd comparator Output end be connected, the positive input terminal of the 3rd comparator receives first reference voltage, the 3rd comparator it is negative Input receives the DC voltage, and the output end of the 3rd comparator exports all reset signal, all reset letter It is number effective in high level.
Preferably, the divider includes the 3rd resistor and the 4th resistance that are series between the voltage of voltage regulation and ground, Node between the 3rd resistor and the 4th resistance exports first reference voltage.
Preferably, the 4th resistance is off chip resistor.
According to another aspect of the present invention, a kind of display device is additionally provided, including:Display panel, it is included by multiple The pel array of pixel cell composition;Drive circuit, it include drive element of the grid, source drive unit, power supply unit and Any detection circuit as described above, the drive element of the grid is used to gate pixel list described in each row in the display panel Unit, the source drive unit is used to provide gray scale voltage to each row pixel cell, and said supply unit is used to provide institute DC voltage is stated, when the display device performs power-off operation, control of the drive element of the grid in all reset signal The lower the multiple pixel cell gated simultaneously in the display panel of system.
In display device of the invention, detection circuit is to DC voltage (or sampled voltage of DC voltage) and DC voltage The voltage division signal of voltage of voltage regulation be compared, and all reset signal XON is produced according to comparative result, so as to by direct current Pressure has carried out secondary detection, it is to avoid detection circuit is under the influence of interference signal because of the output error to DC voltage erroneous judgement All reset signal, prevents display device from occurring abnormal, and antijamming capability and the display of detection circuit are improve to a certain extent The stability of device.Simultaneously as the supply voltage of logic module is equal to the voltage of voltage regulation of DC voltage in detection circuit, therefore In a period of time after display device power-off, detection circuit is able to maintain that normal work and produces correct all reset signal extremely Drive element of the grid so that drive element of the grid can to display panel in each row pixel cell export high level simultaneously subtracting Weak or elimination afterimage.
Brief description of the drawings
By description referring to the drawings to the embodiment of the present invention, of the invention above-mentioned and other purposes, feature and Advantage will be apparent from.
Fig. 1 shows the structural representation of the display device of first embodiment of the invention.
Fig. 2 shows to detect the schematic block diagram of circuit in the display device of first embodiment of the invention.
Fig. 3 shows to detect the schematic block diagram of circuit in the display device of second embodiment of the invention.
Specific embodiment
The present invention is more fully described hereinafter with reference to accompanying drawing.In various figures, identical element is attached using what is be similar to Icon is remembered to represent.For the sake of clarity, the various pieces in accompanying drawing are not necessarily to scale.Additionally, may not show in figure Go out some known parts.
Describe hereinafter many specific details of the invention, the structure of such as device, material, size, place's science and engineering Skill and technology, to be more clearly understood that the present invention.But just as the skilled person will understand, can not press The present invention is realized according to these specific details.
Below, the present invention is described in detail referring to the drawings.
Fig. 1 shows the structural representation of the display device of first embodiment of the invention.
As shown in figure 1, display device 1000 includes drive circuit and display panel 1200.
Drive circuit includes timing control unit 1110, source drive unit 1120, drive element of the grid 1130, detection electricity Road 1140 and power supply unit 1150.Power supply unit 1150 is used to provide the supply voltage (portion in drive circuit needed for each unit Point line is not shown), such as 1150 pairs of detection circuits of power supply unit provide DC voltage VIN so that detection circuit 1140 can lead to Cross the working condition that detection DC voltage VIN knows display device;Timing control unit 1110 provides various control signals respectively To source drive unit, drive element of the grid and detection circuit;Source drive unit 1120 passes through a plurality of data lines D [1]~D [m] is that display panel 1200 provides gray scale voltage;Drive element of the grid 1130 is display by multi-strip scanning line G [1]~G [n] Panel 1200 provides gating signal, and wherein n and m is respectively the natural number more than or equal to 1;Detection circuit 1140 is used to be filled in display Effective all reset signal XON is produced when putting power-off shutdown, to cause drive element of the grid 1130 simultaneously to multi-strip scanning line G [1]~G [n] apply conducting voltage, so as to by a period of time in simultaneously turn on display panel in each TFT method decrease or Eliminate the afterimage that display device occurs in shutdown.
Display panel 1200 includes pressing multiple pixel cells 1210 of n row m column matrix arrangement, and each pixel cell 1210 is wrapped Include a thin film transistor (TFT) TFT, the gate interconnection of the TFT included positioned at the pixel cell of same a line and with a scan line phase Even to receive the gating signal of the row provided by drive element of the grid 1130, the pixel cell positioned at same row is included TFT source electrode interconnection and be connected to receive the GTG of the row provided by source drive unit 1120 with a data line Voltage, so as to realize the display of image.
In the present embodiment, the Part I of drive element of the grid 1130 is integrated in formation array base on display panel 1200 Type structure (Gate Driver On Array, GOA), Part II includes level shifting circuit.Wherein, drive element of the grid 1130 Part I is connected by n bars scan line with the grid of the TFT of each row pixel cell in display panel, raster data model The positive supply voltage VGH of the level shifting circuit in the Part II of unit 1130 meets the grid of each TFT in display panel 1200 The condition of pole conducting voltage, the negative supply voltage VGL of level shifting circuit meets the gate turn-off of each TFT in display panel 1200 The condition of voltage.
When all reset signal XON for detecting that circuit 1140 is provided is invalid, drive element of the grid 1130 does not perform all reset Function (i.e. ghost elimination function), the level shifting circuit in drive element of the grid 1130 respectively carries timing control unit 1110 The the first control signal CK1 for supplying is converted into the second control signal, the high level voltage and low level voltage point of the second control signal Not Deng Yu positive supply voltage VGH and negative supply voltage VGL so that drive element of the grid 1130 can be according to the second control signal Enough driving voltages are produced with the conducting of each row TFT in realizing to display panel and the control for turning off.
When all reset signal XON for detecting that circuit 1140 is provided is effective, drive element of the grid 1130 performs all reset work( Can, for high level, (voltage is equal to the second control signal that the level shifting circuit in drive element of the grid 1130 is provided simultaneously Positive supply voltage VGH) so that the n rows TFT in display panel is simultaneously turned on a period of time, to realize answering for each TFT Position, reaches the phenomenon for slowing down or eliminating the image retention that display device occurs in shutdown.
Fig. 2 shows to detect the schematic block diagram of circuit in the display device of first embodiment of the invention.
As shown in Fig. 2 detection circuit 1140 includes voltage generating module 1141 and logic module, wherein logic module bag Include sample circuit 1142, first comparator 1143, the second comparator 1144 and gate circuit 1145.
Sample circuit 1142 is used to that DC voltage VIN to be sampled and obtains voltage V1 (i.e. sampled voltage), wherein, direct current Pressure VIN is protected for a supply voltage of the offer of power supply unit 1150, and the supply voltage under the "on" position of display device 1000 Hold constant, the magnitude of voltage decline when display device 1000 is shut down and powered off.A kind of implementation of sample circuit 1142 is:Such as Fig. 2 Shown, sample circuit 1142 includes two resistance R1 and R2 being connected between DC voltage VIN and ground, between two resistance Node output voltage V1, therefore, voltage V1 is the sampled voltage of DC voltage VIN.
Voltage generating module 1141 is used to produce voltage V2 (i.e. voltage of voltage regulation) according to DC voltage VIN, and according to voltage V2 produces voltage Vref1 (i.e. the first reference voltage).Voltage generating module 1141 includes voltage-stablizer U1, resistance R3 and resistance R4 (resistance R3 and resistance R4 composition divider), wherein, voltage-stablizer U1 obtains voltage V2 to DC voltage VIN voltage stabilizings, resistance R3 and Resistance R4 is connected between voltage V2 and ground, the node output voltage Vref1 between resistance R3 and resistance R4, so as to realize to electricity Press the partial pressure of V2.When display device 1000 is shut down to be powered off, the magnitude of voltage of voltage V2 can keep one in the presence of voltage-stablizer U1 The section time, and DC voltage VIN then can decay to 0 with speed faster by high level, therefore compare voltage V2 as first The supply voltage of device 1143, the second comparator 1144 and gate circuit 1145 ensure that detection circuit 1140 is closed in display device Normal work in a period of time after machine power-off.
First comparator 1143 is used to compare the magnitude of voltage of DC voltage VIN and voltage Vref1 to obtain the first detection letter Number Comp1.
Second comparator 1144 is used for the magnitude of voltage of comparison voltage V1 and voltage Vref2 (i.e. the second reference voltage) to obtain Second detection signal Comp2.Wherein, the magnitude of voltage of voltage Vref2 is slightly less than DC voltage VIN minimum values in the energized state With the product of R2/ (R1+R2).Wherein, voltage Vref2 can be provided by external circuit, it is also possible to by designing in logic module Interior reference voltage source is provided.
Gate circuit 1145 is used to produce all reset signal according to first detection signal Comp1 and the second detection signal Comp2 XON.Only when first detection signal Comp1 and the second detection signal Comp2 are effective status, the output of gate circuit 1145 has The all reset signal XON of effect.
As a kind of preferred embodiment, the positive input terminal receiving voltage Vref1 of first comparator 1143, negative input termination Voltage VIN is received, meanwhile, the positive input terminal receiving voltage Vref2 of the second comparator 1144, negative input end receive DC voltage V1, Gate circuit 1145 carries out obtaining all reset signal XON with computing to first detection signal Comp1 and the second detection signal Comp2. When display device 1000 is in normal boot-strap state, the first detection signal Comp1 of the output of first comparator 1143 is low electricity Flat, the second detection signal Comp2 of the output of the second comparator 1144 is low level, and now two, gate circuit 1145 pair is low level Signal carries out obtaining low level all reset signal XON (invalid) with computing, therefore, drive element of the grid 1130 does not perform complete multiple Bit function, the pixel cell in display panel is driven with normal display image by drive element of the grid 1130 line by line;When display is filled When putting 1000 shutdown power-off, because DC voltage VIN will settle under voltage Vref1, therefore first comparator 1143 is exported First detection signal Comp1 high level is changed into from low level, and the magnitude of voltage of voltage V1 also can be with DC voltage VIN Drop and drop under voltage Vref2, so that the second detection signal Comp2 of the output of the second comparator 1144 is also become by low level It is high level, when first detection signal Comp1 and the second detection signal Comp2 are high level, gate circuit 1145 is exported All reset signal XON high level (effective) will be changed into from low level, now, drive element of the grid 1130 will perform all reset work( Can, i.e., the second control signal that the level shifting circuit in drive element of the grid 1130 is provided is simultaneously high level (voltage etc. In positive supply voltage VGH) so that the n rows TFT in display panel is simultaneously turned on a period of time, to realize answering for each TFT Position, reaches the phenomenon for slowing down or eliminating the image retention that display device occurs in shutdown.Due to only working as first detection signal All reset signal XON is just effective when Comp1 and the second detection signal Comp2 are high level, therefore avoids detection circuit 1140 there is the phenomenon of detection mistake when interference signal is included in DC voltage VIN, improve detection circuit and display device Antijamming capability.
Detect circuit 1140 a part (in resistance R1 to R4 certain or some resistances exceed the resistance of certain threshold value can be with Realized by the discrete component being placed in by chip exterior, to avoid resistance from occupying excessive area in chip internal) and grid drive The Part II of moving cell 1130 can be integrated in same chip, and the chip is, for example, electrical level transferring chip or power management Chip etc..Used as a kind of embodiment, drive circuit is at least realized by a chip, detects the voltage-stablizer U1 and logic of circuit 1140 Module is integrated in the chip, and the chip has pin P1, pin P2 and pin P3, and resistance R1 and resistance R2 is outside the chip It is series between pin P1 and ground, the node between pin P2 and resistance R1 and resistance R2 is connected, pin P3 and resistance R3 and electricity Node between resistance R4 is connected, and resistance R4 is connected between pin P3 and ground outside the chip.But the reality of detection circuit 1140 Existing not limited to this.
Detection circuit in display device according to a first embodiment of the present invention when all reset signal XON is produced, not only Sampled voltage to the DC voltage of display device is detected, while also directly DC voltage is detected, only when two Individual testing result is characterized when display device is in shutdown off-position and can just export effective all reset signal, it is to avoid detection Circuit under the influence of interference signal all reset signal of output error and cause display device exception, so as to improve detection electricity The antijamming capability on road and the stability of display device.Simultaneously as detection circuit is detected by DC voltage voltage stabilizing Supply voltage in circuit, thus display device power-off after a period of time in, detection circuit be able to maintain that normal work, from And produce correct all reset signal to drive element of the grid so that drive element of the grid can to display panel in each row picture Plain unit exports high level to weaken or eliminate afterimage simultaneously.
The display device of second embodiment of the invention is essentially identical with the structure of the display device of first embodiment of the invention, Difference is:Detect that the structure of circuit is filled with the display of first embodiment of the invention in the display device of second embodiment of the invention The structure for putting middle detection circuit is different, and the other parts structure of the display device of second embodiment of the invention is real with the present invention first The other parts structure for applying the display device of example is identical, will not be repeated here.Second embodiment of the invention is detailed below The structure of circuit is detected in display device.
Fig. 3 shows to detect the schematic block diagram of circuit in the display device of second embodiment of the invention.
As shown in figure 3, the detection circuit 2140 of second embodiment of the invention includes logic module and voltage generating module 2142, wherein logic module includes the 3rd comparator 2141.So as to the detection circuit 2140 and this hair of second embodiment of the invention The detection circuit 1140 of bright first embodiment is compared, more simplified in structure.
Voltage generating module 2142 is used to produce voltage V3 (i.e. voltage of voltage regulation) according to DC voltage VIN, and according to voltage V3 produces voltage Vref3 (i.e. the first reference voltage).Voltage generating module 2142 includes voltage-stablizer U2, resistance R5 and resistance R6 (resistance R5 and resistance R6 composition divider), wherein, voltage-stablizer U2 obtains voltage V3 to DC voltage VIN voltage stabilizings, resistance R5 and Resistance R6 is connected between voltage V3 and ground, the node output voltage Vref3 between resistance R5 and resistance R6.When display device is closed When machine is powered off, the magnitude of voltage of voltage V3 can keep for a period of time in the presence of voltage-stablizer U2, and DC voltage VIN then can with compared with Fast speed decays to 0 by high level, therefore ensure that detection using voltage V3 as the supply voltage of the 3rd comparator 2141 The normal work in a period of time after display device power-off of circuit 2140.
3rd comparator 2141 is used to compare the magnitude of voltage of DC voltage VIN and voltage Vref3 to directly obtain all reset Signal XON.
As a kind of preferred embodiment, the positive input terminal receiving voltage Vref3 of the 3rd comparator 2141, negative input termination Receive DC voltage VIN.When display device is in normal boot-strap state, all reset signal XON of the output of the 3rd comparator 2141 It is low level (invalid), therefore, drive element of the grid does not perform all reset function, and the pixel cell in display panel is line by line by grid Pole driver element is driven with normal display image;When display device is shut down to be powered off, because DC voltage VIN will settle to voltage Under Vref3, therefore all reset signal XON of the output of the 3rd comparator 2141 is changed into high level and (is changed into from invalid from low level Effectively), now, the level shifting circuit that drive element of the grid will be performed in all reset function, i.e. drive element of the grid is provided The second control signal be high level (voltage be equal to positive supply voltage VGH) so that the n rows TFT in display panel is same When conducting a period of time, to realize the reset of each TFT, reach that to slow down or eliminates display device image for occurring when shutting down residual The phenomenon stayed.
Detect circuit 2140 a part (when resistance R5 and/or R6 resistance exceed certain threshold value when, can be by discrete The form of element realizes resistance R5 and/or resistance R6, to avoid resistance from occupying excessive area in chip internal) and raster data model The Part II of unit can be integrated in same chip, and the chip is, for example, electrical level transferring chip or power management chip Deng.Used as a kind of embodiment, drive circuit is at least realized by a chip, detects the voltage-stablizer U2 and logic module of circuit 2140 It is integrated in the chip, there is the chip pin P4 and pin P5, resistance R6 to be connected to pin P5 with ground in chip exterior Between, pin P4 is connected with the negative input end of the 3rd comparator 2141 and the input of voltage-stablizer U2 of the chip internal.But That detects circuit 2140 is practiced without limitation to this.
Detection circuit in display device according to a second embodiment of the present invention is detected when all reset signal XON is produced Circuit directly produces all reset signal according to the DC voltage of display device, it is to avoid detection circuit is under the influence of interference signal The all reset signal of output error and cause display device exception, so as to improve detection circuit antijamming capability and display fill The stability put.Simultaneously as detection circuit by DC voltage voltage stabilizing obtain detection circuit in supply voltage, therefore In a period of time after display device power-off, detection circuit is able to maintain that normal work, so as to produce correct all reset signal To drive element of the grid so that drive element of the grid can to display panel in each row pixel cell simultaneously export high level with Weaken or eliminate afterimage.
Although it is noted that to detection circuit and the design side of drive element of the grid in the various embodiments described above Formula depicts a possible form, but knows this operator, it should be understood that each manufacturer is for detection circuit and drive element of the grid Design it is all different, therefore application of the invention is when being not restricted to this kind of possible kenel.In other words, as long as passing through The reference signal being compared with the sampled voltage of DC voltage or DC voltage to the voltage stabilizing generation of DC voltage, and according to than Relatively result produces all reset signal, drive element of the grid to drive display panel simultaneously in the presence of effective all reset signal Each row pixel cell, has been just to have met spirit place of the invention.For example, the logic module in detection circuit can include , to realize logical relation corresponding with all reset function, the positive input terminal and negative input end of each comparator can be with for multiple gate circuits Exchange, all reset signal XON can be invalid etc. for Low level effective, high level.
In sum, using detection circuit in display device of the invention, and using detecting that circuit is (or straight to DC voltage Flow the sampled voltage of voltage) and the voltage division signal of voltage of voltage regulation of DC voltage be compared, detect circuit according to comparative result Produce all reset signal XON, by the secondary detection to DC voltage avoid detection circuit under the influence of interference signal because , there is exception, to a certain extent so as to avoid display device in all reset signal of output error to DC voltage erroneous judgement Improve the antijamming capability of detection circuit and the stability of display device.Simultaneously as detection circuit is by DC voltage Voltage stabilizing obtain detection circuit in supply voltage, therefore display device power-off after a period of time in, detection circuit can tie up Normal work is held, so as to produce correct all reset signal to drive element of the grid so that drive element of the grid can be to display Each row pixel cell in panel exports high level to weaken or eliminate afterimage simultaneously.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating In any this actual relation or order.And, term " including ", "comprising" or its any other variant be intended to Nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that Also there is other identical element in process, method, article or equipment including the key element.
According to embodiments of the invention as described above, these embodiments do not have all of details of detailed descriptionthe, not yet It is only described specific embodiment to limit the invention.Obviously, as described above, can make many modifications and variations.This explanation Book is chosen and specifically describes these embodiments, is in order to preferably explain principle of the invention and practical application, so that affiliated Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.The present invention only receives right The limitation of claim and its four corner and equivalent.

Claims (10)

1. a kind of detection circuit for display device, it is characterised in that the detection circuit includes voltage generating module and patrols Module is collected, wherein,
The voltage generating module includes:
Voltage-stablizer, its input receives the DC voltage in the display device, and its output end provides the steady of the DC voltage Piezoelectricity pressure;And
Divider, its input is connected with the output end of the voltage-stablizer, for carrying out partial pressure to obtain to the voltage of voltage regulation First reference voltage, first reference voltage is exported by the output end of the divider;
The logic module is used to provide all reset letter according to the comparative result of the DC voltage and first reference voltage Number;
When the display device performs power-off operation, all reset signal is effective.
2. detection circuit according to claim 1, wherein, the logic module includes:
Sample circuit, it samples to obtain sampled voltage to the DC voltage;
First comparator, it produces first detection signal according to the DC voltage and first reference voltage;Second compares Device, it produces the second detection signal according to the sampled voltage and the second reference voltage;And
Gate circuit, it produces all reset signal according to the first detection signal and second detection signal.
3. detection circuit according to claim 2, wherein, the positive input terminal of the first comparator receives first ginseng Voltage is examined, the negative input end of the first comparator receives the DC voltage, and the feeder ear of the first comparator receives institute Voltage of voltage regulation is stated, the output end of the first comparator provides the first detection signal;
The positive input terminal of second comparator receives second reference voltage, and the negative input end of second comparator is received The sampled voltage, the feeder ear of second comparator receives the voltage of voltage regulation, and the output end of second comparator is carried For second detection signal;
The gate circuit is carried out with computing to obtain all reset to the first detection signal and second detection signal Signal, all reset signal is effective when being high level.
4. detection circuit according to claim 3, wherein, it is described when the display device is in normal operating conditions Second reference voltage is less than the sampled voltage.
5. detection circuit according to claim 2, wherein, the sample circuit includes being connected on the DC voltage and ground Between first resistor and second resistance, between the first resistor and the second resistance node output it is described sampling electricity Pressure.
6. detection circuit according to claim 5, wherein, the first resistor and the second resistance are off chip resistor.
7. detection circuit according to claim 1, wherein, the logic module includes the 3rd comparator, the 3rd ratio Feeder ear compared with device is connected with the output end of the voltage-stablizer, and the positive input terminal of the 3rd comparator receives first reference Voltage, the negative input end of the 3rd comparator receives the DC voltage, and the output end output of the 3rd comparator is described All reset signal, all reset signal is effective in high level.
8. detection circuit according to claim 1, wherein, the divider includes being series at the voltage of voltage regulation and ground Between 3rd resistor and the 4th resistance, between the 3rd resistor and the 4th resistance node output it is described first with reference to electricity Pressure.
9. detection circuit according to claim 8, wherein, the 4th resistance is off chip resistor.
10. a kind of display device, including:
Display panel, it includes the pel array being made up of multiple pixel cells;
Drive circuit, it includes drive element of the grid, source drive unit, power supply unit and as described in claim 1 to 9 Any detection circuit, the drive element of the grid is used to gate pixel cell, the source described in each row in the display panel Pole driver element is used to provide gray scale voltage to each row pixel cell, and said supply unit is used to provide the direct current Pressure,
When the display device perform power-off operation when, the drive element of the grid under the control of all reset signal simultaneously Gate the multiple pixel cell in the display panel.
CN201710123785.5A 2017-03-03 2017-03-03 Detection circuit and display device Active CN106847143B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107731186A (en) * 2017-10-31 2018-02-23 京东方科技集团股份有限公司 A kind of control circuit, control method and display device
CN109668593A (en) * 2018-12-26 2019-04-23 西安清宇网络科技有限公司 A kind of integrated sensor, Illumination adjusting device and adjusting method for street lamp
CN110310610A (en) * 2019-07-30 2019-10-08 昆山龙腾光电有限公司 Control circuit and its display device
US11043168B2 (en) 2018-08-24 2021-06-22 Chengdu Boe Optoelectronics Technology Co., Ltd. Shift register and method for driving the same, gate driving circuit and display apparatus
US20220284853A1 (en) * 2020-12-14 2022-09-08 Hefei Boe Joint Technology Co., Ltd. Display module and method for driving the same, and display apparatus

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1991952A (en) * 2005-12-27 2007-07-04 元太科技工业股份有限公司 Method for eliminating remnant shadow of display unit
KR20070075696A (en) * 2006-01-16 2007-07-24 삼성전자주식회사 Apparatus for remove afterimage image in liquid crystal display
CN102290032A (en) * 2010-06-18 2011-12-21 群康科技(深圳)有限公司 Liquid crystal display
CN103236234A (en) * 2013-04-28 2013-08-07 合肥京东方光电科技有限公司 Grid driver and display device
CN104575356A (en) * 2015-01-19 2015-04-29 京东方科技集团股份有限公司 Voltage stabilizing circuit, voltage stabilizing method thereof and display device
CN104778933A (en) * 2015-04-15 2015-07-15 昆山龙腾光电有限公司 Power management circuit
CN104795040A (en) * 2015-04-30 2015-07-22 京东方科技集团股份有限公司 Array substrate, display device and shutdown ghost improving circuit for display device
CN204558001U (en) * 2015-04-16 2015-08-12 昆山龙腾光电有限公司 Power-off ghost shadow eliminates circuit and gate driver circuit
CN105607719A (en) * 2014-11-21 2016-05-25 鸿富锦精密工业(武汉)有限公司 Time sequence control circuit

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1991952A (en) * 2005-12-27 2007-07-04 元太科技工业股份有限公司 Method for eliminating remnant shadow of display unit
KR20070075696A (en) * 2006-01-16 2007-07-24 삼성전자주식회사 Apparatus for remove afterimage image in liquid crystal display
CN102290032A (en) * 2010-06-18 2011-12-21 群康科技(深圳)有限公司 Liquid crystal display
CN103236234A (en) * 2013-04-28 2013-08-07 合肥京东方光电科技有限公司 Grid driver and display device
CN105607719A (en) * 2014-11-21 2016-05-25 鸿富锦精密工业(武汉)有限公司 Time sequence control circuit
CN104575356A (en) * 2015-01-19 2015-04-29 京东方科技集团股份有限公司 Voltage stabilizing circuit, voltage stabilizing method thereof and display device
CN104778933A (en) * 2015-04-15 2015-07-15 昆山龙腾光电有限公司 Power management circuit
CN204558001U (en) * 2015-04-16 2015-08-12 昆山龙腾光电有限公司 Power-off ghost shadow eliminates circuit and gate driver circuit
CN104795040A (en) * 2015-04-30 2015-07-22 京东方科技集团股份有限公司 Array substrate, display device and shutdown ghost improving circuit for display device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107731186A (en) * 2017-10-31 2018-02-23 京东方科技集团股份有限公司 A kind of control circuit, control method and display device
US10510316B2 (en) 2017-10-31 2019-12-17 Boe Technology Group Co., Ltd. Control circuit, control method and display apparatus
US11043168B2 (en) 2018-08-24 2021-06-22 Chengdu Boe Optoelectronics Technology Co., Ltd. Shift register and method for driving the same, gate driving circuit and display apparatus
CN109668593A (en) * 2018-12-26 2019-04-23 西安清宇网络科技有限公司 A kind of integrated sensor, Illumination adjusting device and adjusting method for street lamp
CN110310610A (en) * 2019-07-30 2019-10-08 昆山龙腾光电有限公司 Control circuit and its display device
US20220284853A1 (en) * 2020-12-14 2022-09-08 Hefei Boe Joint Technology Co., Ltd. Display module and method for driving the same, and display apparatus
US12094404B2 (en) * 2020-12-14 2024-09-17 Hefei Boe Joint Technology Co., Ltd. Display module and method for driving the same, and display apparatus

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