CN106847143A - Detection circuit and display device - Google Patents
Detection circuit and display device Download PDFInfo
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- 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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- 238000001514 detection method Methods 0.000 title claims abstract description 97
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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
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
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.
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