CN110310610A - Control circuit and its display device - Google Patents
Control circuit and its display device Download PDFInfo
- Publication number
- CN110310610A CN110310610A CN201910694705.0A CN201910694705A CN110310610A CN 110310610 A CN110310610 A CN 110310610A CN 201910694705 A CN201910694705 A CN 201910694705A CN 110310610 A CN110310610 A CN 110310610A
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- Prior art keywords
- threshold voltage
- voltage
- supply voltage
- ghost
- signal
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
Abstract
This application discloses a kind of control circuit and its display device, control circuit includes detecting module, by supply voltage respectively compared with first threshold voltage and second threshold voltage to generate consequential signal；Control module connects detecting module, when consequential signal characterization supply voltage is lower than second threshold voltage, control module enters ghost and eliminates mode to provide the output signal for eliminating power-off ghost shadow, when consequential signal characterization supply voltage is lower than first threshold voltage and is higher than second threshold voltage, control module operating mode is remained unchanged；When consequential signal characterization supply voltage is higher than first threshold voltage, control module exits ghost and eliminates mode, and second threshold voltage is lower than first threshold voltage.The present invention can prevent from eliminating the false triggering of ghost mode in the state that supply voltage fluctuates, and avoid display device and abnormal display phenomenon occurs.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of control circuits and its display device.
Background technique
Display device mainly includes display panel and the circuit printing plate that is attached thereto, includes multiple productions in circuit printing plate
The circuit of the raw control signal for controlling the display panel work.It include the pixel unit of array arrangement, each pixel on display panel
Unit includes thin film transistor (TFT) and the pixel electrode being attached thereto.Gate driving circuit, source are included at least on circuit printing plate
Pole driving circuit, sequential control circuit.Gate driving circuit connects the grid of above-mentioned thin film transistor (TFT), source electrode drive circuit connection
The drain electrode of the source electrode of thin film transistor (TFT), thin film transistor (TFT) connects pixel electrode.Sequential control circuit is separately connected gate driving electricity
Road, source electrode drive circuit are to export control signal grid pole driving circuit and source electrode drive circuit work.
Specifically, gate driving circuit opens thin film transistor (TFT) through control signal driving, and source electrode drive circuit is believed through control
Luma data writing pixel electrode is realized that grayscale is shown by number driving.When liquid crystal display device shutdown, pixel unit
Charge residue is had on pixel electrode, is usually provided with the control circuit for eliminating power-off ghost shadow, the control circuit in the prior art
By judge acquisition supply voltage whether reach starting function of eliminating power-off ghost shadow threshold voltage condition eliminate shutdown
Ghost.
However, the supply voltage when display device fluctuates in shutdown process, accidentally detecting error starting may be led to
The function of power-off ghost shadow is eliminated, so that exception occurs in display.
Summary of the invention
In view of the above problems, the purpose of the present invention is to provide a kind of control circuit and its display device, so as to avoid
Because accidentally detecting causes to enter by mistake through elimination power-off ghost shadow mode.
According to an aspect of the present invention, a kind of control circuit of display device is provided, the supply voltage selection based on acquisition
Into or exit the ghost and eliminate mode, including detecting module, by the supply voltage and first threshold voltage and the
Two threshold voltages are compared respectively to generate consequential signal；Control module connects the detecting module, when the consequential signal
When characterizing the supply voltage lower than the second threshold voltage, the control module enters ghost elimination mode and is used for providing
That eliminates power-off ghost shadow outputs signal to the display panel, wherein is lower than when the consequential signal characterizes the supply voltage
The first threshold voltage and be higher than the second threshold voltage when, the operating mode of the control module remains unchanged；Work as institute
When stating the consequential signal characterization supply voltage higher than the first threshold voltage, the control module exits the ghost and eliminates
Mode, the second threshold voltage are lower than the first threshold voltage.
Preferably, the control module includes: control unit, based on the supply voltage and the first threshold voltage
First consequential signal and the supply voltage and the second consequential signal of the second threshold voltage generate switch control signal；
And switch unit, described control unit is connected, is entered based on the switch control signal or exits the ghost and eliminate mould
Formula.
Preferably, after the control module enters the ghost elimination mode, when the consequential signal characterizes the confession
When piezoelectric voltage is lower than the first threshold voltage, the control module is maintained at the ghost and eliminates mode.
Preferably, described control unit includes: latch, and first input end connects and receive first consequential signal,
Second input terminal connects and receives second consequential signal；And digital analog converter, connect the output end of the latch, root
The switch control signal is generated according to the logical consequence of the latch.
Preferably, the switch unit includes: at least one switching tube, and the control terminal of the switching tube connects and receives institute
Switch control signal is stated, the first path terminal of the switching tube connects and receive the first level, and the control module enters ghost
The display panel that outputs signal to for eliminating power-off ghost shadow, first level are exported by alternate path end when elimination mode
The thin film transistor (TFT) being used to open in the display panel.
Preferably, when the consequential signal characterizes the supply voltage higher than the first threshold voltage, the switch control
Signal processed is in inactive level state；The consequential signal characterizes the supply voltage lower than the first threshold voltage and is higher than
When the second threshold voltage, the level state of the switch control signal is remained unchanged；And the consequential signal characterizes institute
When stating supply voltage lower than the second threshold voltage, the switch control signal is in significant level state.
Preferably, the detecting module includes: the first detecting module, is based on the supply voltage and the first threshold
Voltage obtains first consequential signal；And second detecting module, based on the supply voltage and second threshold electricity
Pressure obtains second consequential signal.
Preferably, first detecting module includes: the first potential-divider network, by the supply voltage voltage division processing to generate
First partial pressure；And first comparator, the first input end connection of the first comparator is described and receives first partial pressure,
Second input terminal of the comparator connects and receives reference voltage, and the output end of the comparator exports the first result letter
Number, wherein the partial pressure coefficient of first potential-divider network is related to the first threshold voltage, the reference voltage.
Preferably, second detecting module includes: the second potential-divider network, by the supply voltage voltage division processing to generate
Second partial pressure；And second comparator, the first input end connection of second comparator is described and receives second partial pressure,
Second input terminal of the comparator connects and receives reference voltage；The input terminal of logic gate, the logic gate connects the ratio
Compared with the output end of device, the output end of the logic gate exports second consequential signal, wherein point of second potential-divider network
Press coefficient related to the second threshold voltage, the reference voltage.
According to another aspect of the present invention, a kind of display device is provided, the control circuit including above-mentioned offer.
Control circuit and its display device provided by the invention, by detecting real-time supply voltage, and display device into
When entering to eliminate power-off ghost shadow mode, when supply voltage characterize display device be in shutdown state when fluctuate, still protect
The function of holding elimination power-off ghost shadow executes operation, without the secondary operation for entering elimination power-off ghost shadow mode, avoids aobvious
Abnormal display phenomenon occurs for showing device.
Detailed description of the invention
By referring to the drawings to the description of the embodiment of the present invention, above-mentioned and other purposes of the invention, feature and
Advantage will be apparent from, in the accompanying drawings:
Fig. 1 shows the structural schematic diagram of the display device provided according to embodiments of the present invention；
Fig. 2 shows the structural schematic diagrams of the control circuit of offer according to embodiments of the present invention；
Fig. 3 shows the schematic diagram of the control circuit provided according to embodiments of the present invention.
Specific embodiment
The various embodiments that the present invention will be described in more detail that hereinafter reference will be made to the drawings.In various figures, identical element
It is indicated using same or similar appended drawing reference.For the sake of clarity, the various pieces in attached drawing are not necessarily to scale.
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.
Fig. 1 shows the structural schematic diagram of the display device provided according to embodiments of the present invention, as shown in Figure 1, display dress
Setting 100 includes display panel 110, source electrode drive circuit 120, gate driving circuit 130, sequential control circuit 140 and shutdown
Control circuit 150.
Display panel 110 includes the pixel unit of n × m array arrangement, each pixel unit include thin film transistor (TFT) and
Pixel electrode.The grid of thin film transistor (TFT) connects the output end of gate driving circuit 130 by the grid line of row arrangement, and film is brilliant
The source electrode of body pipe connects the output end of source electrode drive circuit 120, the drain electrode connection of thin film transistor (TFT) by the source electrode line of column arrangement
Pixel electrode in this pixel unit.Wherein, n, m are positive integer.
Sequential control circuit 140 is controlled according to system to be generated for driving the first kind of source electrode drive circuit 120 to control letter
Number Cs and for driving the second class of gate driving circuit 130 to control signal Cg.
Source electrode drive circuit 120 connects sequential control circuit 140, and is driven source electrode based on first kind control signal Cs driving
Dynamic signal S1-Sm exports into pixel unit the source electrode of thin film transistor (TFT).
Gate driving circuit 130 connects sequential control circuit 140, and is driven grid based on the control signal Cg driving of the second class
Dynamic signal G1-Gn exports into pixel unit the grid of thin film transistor (TFT) to open thin film transistor (TFT), and then will characterize grayscale
In the pixel electrode of data writing pixel unit, realize that grayscale is shown.
Shutdown control circuit 150 is reduced to the detecting voltage of elimination power-off ghost shadow in display device shutdown and supply voltage
When, machine control signal Xon is closed to gate driving circuit 130, to drive gate driving circuit into eliminating ghost mode and exporting
The gate drive signal S1-Sn of 130 output effective statuses, and then the opening of the thin film transistor (TFT) in 110 is controlled the display panel, in turn
Discharge remaining charge in pixel electrode.
Display device in the present embodiment is described in detail by taking liquid crystal display device as an example, however the display in the application
Device is not limited with liquid crystal display device.It should be noted that prevent the maloperation in booting of shutdown control circuit 150, when
Other in display device 100 are controlled when sequence control circuit 140 reaches compressor start up condition based on supply voltage after preset time
Circuit work, specifically, can be arranged delay circuit or timing circuit to implement above-mentioned behaviour in sequential control circuit 140
Make.
Fig. 2 shows the structural schematic diagrams of the control circuit of offer according to embodiments of the present invention, as shown in Fig. 2, shutdown control
Circuit 150 processed includes the first detecting module 151, the second detecting module 152 and control module 153.
Supply voltage Vin is obtained the first consequential signal, power supply electricity by the first detecting module 151 compared with first threshold voltage
Pressure Vin is used to characterize the real-time voltage value that system work is supported in display device, and first threshold voltage is, for example, to characterize display dress
Set maximum voltage value when voltage fluctuates in the shutdown state.First consequential signal is used to confirm whether display device enters
Off-mode.
Supply voltage Vin is obtained the second consequential signal, power supply electricity by the second detecting module 152 compared with second threshold voltage
Pressure Vin is used to characterize the real-time voltage value that system work is supported in display device, and second threshold voltage is, for example, to characterize display dress
It sets in voltage value when eliminating power-off ghost shadow detecting point.Second consequential signal is used to confirm whether display device reaches to enter and disappears
Except the condition of power-off ghost shadow mode.Wherein, second threshold voltage is lower than first threshold voltage, and first threshold voltage and second
The voltage value of threshold voltage is close.
Control module 153 includes control unit 1531 and switch unit 1532, and control unit 1532 is separately connected first
Detecting module 151 and the second detecting module 152, to generate switch control letter based on the first consequential signal and the second consequential signal
Number Ctrl.Wherein when supply voltage Vin meets the condition that power-off ghost shadow is eliminated in starting, i.e. supply voltage Vin is lower than second threshold
When voltage, switch control signal Ctrl is in significant level state；When supply voltage Vin is higher than second threshold voltage and lower than the
When one threshold voltage, the level state of switch control signal Ctrl remains unchanged the level state before maintaining；When power supply electricity
When Vin being pressed to be higher than first threshold voltage, switch control signal Ctrl is in inactive level state.The connection control of switch unit 1532
Unit 1531 enters according to switch control signal Ctrl to receive switch control signal Ctrl or exits ghost and eliminate mould
Formula.It is provided when ghost eliminates mode for eliminating the output signal Xon of power-off ghost shadow to display panel when control module enters.
Specifically, the particular circuit configurations of above-mentioned shutdown control circuit 150 are as described below.
Fig. 3 shows the schematic diagram of the control circuit provided according to embodiments of the present invention, as shown in figure 3, shutdown control electricity
Road 150 includes the first detecting module 151, the second detecting module 152 and control module 153.
First detecting module 151 includes the first potential-divider network 1511 and first comparator U1.First potential-divider network 1511
First resistor R1 and second resistance R2 including series connection, the other end of first resistor R1 connect and receive the power supply of acquisition
Voltage Vin, the other end connect and ground of second resistance, the intermediate node that first resistor R1 is connect with second resistance R2 is as
The first partial pressure of divider node output of one potential-divider network 1511, wherein the partial pressure coefficient and first threshold of the first potential-divider network 1511
Voltage and reference voltage Vref are related, and partial pressure coefficient is characterized by the resistance value of first resistor R1 and second resistance R2.First compares
The first input end of device U1 connects the divider node of the first potential-divider network 1511 to receive the first partial pressure, and the of first comparator U1
Two input terminals connect and receive reference voltage Vref, and the output end of first comparator U1 exports the first consequential signal.
Second detecting module 152 includes the second potential-divider network 1512, the second comparator U2 and logic gate U3.Second partial pressure
Network 1512 includes the 3rd resistor R3 and the 4th resistance R4 being connected in series, and the other end of 3rd resistor R3 is connected and received and adopts
The supply voltage Vin of collection, the other end connect and ground of the 4th resistance, the middle node that 3rd resistor R3 is connect with the 4th resistance R4
Point as the second potential-divider network 1521 divider node output second partial pressure, wherein the partial pressure coefficient of the second potential-divider network 1521 and
Second threshold voltage and reference voltage Vref are related, and partial pressure coefficient is characterized by the resistance value of 3rd resistor R3 and the 4th resistance R4.
The first input end of second comparator U2 connects the divider node of the second potential-divider network 1521 to receive the second partial pressure, and second compares
The second input terminal of device U2 connects and receives reference voltage Vref, and the output end of the second comparator U2 is via logic gate U3 output the
Two consequential signals.Wherein received reference voltage Vref can be identical or not in first comparator U1 and the second comparator U2
Together.Logic gate U3 is, for example, NOT gate, wherein the output end in first comparator U1 also can be set in logic gate U3.
Control module 153 includes control unit 1531 and switch unit 1532.
Control unit 1531 includes latch U4 and digital analog converter U5.The end first input end S of latch U4 connects
The output end of first comparator U1, the output end of the second end input terminal R connection logic gate U3 of latch U4, latch U4's is defeated
Outlet exports logical consequence.The output end of digital analog converter U5 connection latch U4To be converted to correspondence according to logical consequence
Switch control signal Ctrl.The wherein logic setting of latch U4 are as follows: when supply voltage Vin is below second threshold voltage
When, the corresponding logical consequence of latch U4 is generated by digital analog converter U5 and exports the switch control signal of significant level state
Ctrl；When supply voltage Vin is above first threshold voltage, the corresponding logical consequence of latch U4 passes through digital analog converter U5
Generate and export the switch control signal Ctrl of inactive level state；When supply voltage Vin lower than first threshold voltage and is higher than
When second threshold voltage, the corresponding logical consequence of latch U4 is by digital analog converter U5 generation and output level status and before
The switch control signal Ctrl remained unchanged.
Switch unit 1532 includes at least one switching tube, the output of the control terminal connection digital analog converter U5 of the switching tube
To receive switch control signal Ctrl, the first path terminal of the switching tube connects and receives the first level VGH, first level at end
VGH is used to open the thin film transistor (TFT) on the display panel of display device, passes through when control module enters when ghost eliminates mode
The alternate path end of switching tube exports the output signal Xon for eliminating power-off ghost shadow.Have when switch control signal Ctrl is in
When imitating level state, the switching tube in unit 1532 is turned on the switch, and the film in display panel is opened according to output signal Xon
Transistor is to discharge remaining charge on pixel electrode.When switch control signal Ctrl is in inactive level state, shutdown is opened
Close unit 1532 in switching tube, do not enter at this time eliminate ghost mode, gate driving circuit still by sequential control circuit into
Row driving.
It should be noted that the conduction type of the switching tube in switch unit 1532 is by the effective of switch control signal Ctrl
The classification of level state determines that, when switch control signal Ctrl is that high level is effective, switching tube uses N-type transistor, when opening
When pass control signal Ctrl is that low level is effective, switching tube uses P-type transistor.In switch unit 1532 quantity of switching tube by
The circuit structure of gate driving circuit determines.
Control circuit provided by the present application enters elimination power-off ghost shadow in display device by real-time detection supply voltage
When mode, when supply voltage characterize display device be in shutdown state when fluctuate, still maintain elimination power-off ghost shadow
Function execute operation, without the restarting function, avoid display device and abnormal display phenomenon occur.
It is as described above according to the embodiment of the present invention, these embodiments details all there is no detailed descriptionthe, also not
Limiting the invention is only the specific embodiment.Obviously, as described above, can make many modifications and variations.This explanation
These embodiments are chosen and specifically described to book, is principle and practical application in order to better explain the present invention, thus belonging to making
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.The present invention is only by right
The limitation of claim and its full scope and equivalent.
Claims (10)
1. a kind of control circuit, the supply voltage selection based on acquisition enters or exits the ghost and eliminates mode, feature
It is, comprising:
The supply voltage and first threshold voltage and second threshold voltage are compared to generate knot by detecting module respectively
Fruit signal；
Control module connects the detecting module, is lower than the second threshold when the consequential signal characterizes the supply voltage
When voltage, the control module, which enters ghost, to be eliminated mode and outputs signal to display surface for eliminate power-off ghost shadow to provide
Plate,
Wherein, when the consequential signal characterizes the supply voltage lower than the first threshold voltage and is higher than the second threshold
When voltage, the operating mode of the control module is remained unchanged；When the consequential signal characterizes the supply voltage higher than described
When first threshold voltage, the control module exits the ghost and eliminates mode, and the second threshold voltage is lower than described first
Threshold voltage.
2. control circuit according to claim 1, which is characterized in that the control module includes:
Control unit, the first consequential signal obtained compared with the first threshold voltage based on the supply voltage and described
The second consequential signal that supply voltage obtains compared with the second threshold voltage generates switch control signal；And
Switch unit connects described control unit, is entered based on the switch control signal or exits the ghost and eliminates mould
Formula.
3. control circuit according to claim 2, which is characterized in that enter the ghost in the control module and eliminate mould
After formula, when the consequential signal, which characterizes the supply voltage, is lower than the first threshold voltage, the control module is maintained at
The ghost eliminates mode.
4. control circuit according to claim 2, which is characterized in that described control unit includes:
Latch, first input end connect and receive first consequential signal, and the second input terminal connects and receives described second
Consequential signal；And
Digital analog converter connects the output end of the latch, generates the switch according to the logical consequence of the latch and controls
Signal processed.
5. control circuit according to claim 2, which is characterized in that the switch unit includes:
The control terminal of at least one switching tube, the switching tube connects and receives the switch control signal, the switching tube
First path terminal connects and receives the first level, and the control module enters when ghost eliminates mode by the of the switching tube
Two path terminals export the display panel that outputs signal to for eliminating power-off ghost shadow, and first level is used to open the display
Thin film transistor (TFT) in panel.
6. control circuit according to claim 4, which is characterized in that the consequential signal characterizes the supply voltage and is higher than
When the first threshold voltage, the switch control signal is in inactive level state；
The consequential signal characterizes the supply voltage lower than the first threshold voltage and when being higher than the second threshold voltage,
The level state of the switch control signal remains unchanged；And
When the consequential signal characterizes the supply voltage lower than the second threshold voltage, the switch control signal, which is in, to be had
Imitate level state.
7. control circuit according to claim 2, which is characterized in that the detecting module includes:
First detecting module obtains first consequential signal based on the supply voltage and the first threshold voltage；With
And
Second detecting module obtains second consequential signal based on the supply voltage and the second threshold voltage.
8. control circuit according to claim 7, which is characterized in that first detecting module includes:
First potential-divider network, by the supply voltage voltage division processing to generate the first partial pressure；And
The first input end connection of first comparator, the first comparator is described and receives first partial pressure, the comparison
Second input terminal of device connects and receives reference voltage, and the output end of the comparator exports first consequential signal,
Wherein, the partial pressure coefficient of first potential-divider network is related to the first threshold voltage, the reference voltage.
9. control circuit according to claim 7, which is characterized in that second detecting module includes:
Second potential-divider network, by the supply voltage voltage division processing to generate the second partial pressure；And
The first input end connection of second comparator, second comparator is described and receives second partial pressure, the comparison
Second input terminal of device connects and receives reference voltage；
Logic gate, the input terminal of the logic gate connect the output end of the comparator, and the output end of the logic gate exports institute
The second consequential signal is stated,
Wherein, the partial pressure coefficient of second potential-divider network is related to the second threshold voltage, the reference voltage.
10. a kind of display device, which is characterized in that including the described in any item control circuits of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910694705.0A CN110310610A (en) | 2019-07-30 | 2019-07-30 | Control circuit and its display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910694705.0A CN110310610A (en) | 2019-07-30 | 2019-07-30 | Control circuit and its display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110310610A true CN110310610A (en) | 2019-10-08 |
Family
ID=68082358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910694705.0A Pending CN110310610A (en) | 2019-07-30 | 2019-07-30 | Control circuit and its display device |
Country Status (1)
| Country | Link |
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| CN (1) | CN110310610A (en) |
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| US20050275613A1 (en) * | 2004-05-15 | 2005-12-15 | Jae-Hyuck Woo | Source voltage removal detection circuit and display device including the same |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Applicant after: Kunshan Longteng Au Optronics Co. Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Applicant before: INFOVISION OPTOELECTRONICS (KUNSHAN) Co.,Ltd. |
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Application publication date: 20191008 |
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