Summary of the invention
The main object of the present invention is to provide a kind of charging circuit, it is intended to solve source driving chip and charge slowly to pixelThe problem of.
To achieve the above object, charging circuit proposed by the present invention is set as the picture that outputting data signals are display panelElement charging, the charging circuit include:
Data voltage input terminal is connect with the output end of source driving chip；
First voltage input terminal and second voltage input terminal, are set as being respectively connected to first voltage and second voltage；
Voltage detection output circuit is set as the data-signal exported according to the source driving chip, exports described theOne voltage or the second voltage；
Switching circuit, including first input end, the second input terminal, controlled end and output end, the first input end and instituteThe output end connection of voltage detection output circuit is stated, second input terminal is connect with the data voltage input terminal, described to openThe controlled end on powered-down road is set as the first timing control signal of access and the second timing control signal；The switching circuit, settingTo export the first voltage or the second voltage to display panel according to first timing control signal；According to describedSecond timing control signal exports the data-signal of the source driving chip output.
Optionally, the charging circuit further include: voltage collection circuit is set as acquiring the voltage of the pixel, and rightAnswer output voltage feedback signal；
Sequence controller is set as exporting the first timing control when the voltage of the pixel is less than goal-selling voltageSignal；When the voltage of the pixel is more than or equal to the goal-selling voltage, the second timing control signal is exported.
Optionally, the ratio range of the goal-selling voltage and the voltage of the output end of the source driving chip is0.8 to 0.9.
Optionally, the voltage detection output circuit includes:
Voltage comparator circuit is set as the voltage and preset reference electricity of the data-signal for exporting the source driving chipPressure is compared, and corresponding output control signal；
Power supply switch circuit is set as exporting the first voltage or second electricity according to the control signal is correspondingPressure.
Optionally, voltage comparator circuit includes comparator and predetermined reference voltage input terminal；
The normal phase input end of the comparator is connect with the output end of the source driving chip, the reverse phase of the comparatorInput terminal is connect with the predetermined reference voltage input terminal, and the output end of the comparator is the output of the voltage comparator circuitEnd.
Optionally, the power supply switch circuit includes first switch tube and second switch, the first switch tube it is defeatedEntering end to connect with the first voltage input terminal, the input terminal of the second switch is connect with the second voltage input terminal,The output end of the controlled end of the first switch tube, the controlled end of the second switch and the comparator interconnects, and described theThe output end of one switching tube is connect with the output end of the second switch, and connecting node is the defeated of the power supply switch circuitOutlet.
Optionally, the first voltage and the second voltage are respectively relative to the opposite voltage of the predetermined reference voltageIt is equal in magnitude, and polarity is on the contrary, the predetermined reference voltage is public electrode voltages.
Optionally, the switching circuit includes third switching tube and the 4th switching tube, the input terminal of the third switching tubeIt is connect with the output end of the voltage detection output circuit, input terminal and the source driving chip of the 4th switching tubeOutput end connection, the pixel of the output end and the display panel of the output end of the third switching tube and the 4th switching tubeThe controlled end of connection, the controlled end of the third switching tube and the 4th switching tube is set as receiving first timing controlSignal or second timing control signal.
The present invention also proposes a kind of display panel, drive circuit, including timing control plate, grid drive chip, source driveChip and charging circuit as described above.
The present invention also proposes a kind of display device, including display panel and display panel, drive circuit as described above.
Technical solution of the present invention is by using data voltage input terminal, first voltage input terminal, second voltage input terminal, electricityPressure detection output circuit and switching circuit constitute the charging circuit of the pixel quick charge for display panel, in source drive coreWhen piece initial power-on, voltage detection output circuit detects the voltage of the data-signal of source driving chip output, and corresponding outputFirst voltage and second voltage, switching circuit receive the first timing control signal and connect first input end and the first output endIt is logical, it is the pixel quick charge of display panel by first voltage or second voltage, passes through in the voltage of the pixel of display panelWhen preset time reaches goal-selling voltage, switching circuit receives the second timing control signal and by the second input terminal and outputEnd connection, and charged by the pixel that source driving chip is display panel, and complete fine charging until charging complete.The present inventionThe pixel charging of display panel is divided into two stages by charging circuit, and carries out high current fast charge and fine charging respectively, thusImprove the pixel charging rate of display panel.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, completeSite preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.BaseEmbodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all itsHis embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and cannot understandFor its relative importance of indication or suggestion or implicitly indicate the quantity of indicated technical characteristic.Define as a result, " first ",The feature of " second " can explicitly or implicitly include at least one of the features.In addition, the technical side between each embodimentCase can be combined with each other, but must be based on can be realized by those of ordinary skill in the art, when the combination of technical solutionConflicting or cannot achieve when occur will be understood that the combination of this technical solution is not present, also not the present invention claims guarantorWithin the scope of shield.
The present invention proposes a kind of charging circuit 300, is set as the pixel that outputting data signals are display panel 200 and charges.
As shown in FIG. 1, FIG. 1 is the module diagram of one embodiment of charging circuit of the present invention, which includes:
Data voltage input terminal is connect with the output end of source driving chip 100；
First voltage V1 input terminal and second voltage V2 input terminal, are set as being respectively connected to first voltage V1 and second voltageV2；
Voltage detection output circuit 10 is set as the data-signal exported according to the source driving chip 100, exports instituteState the first voltage V1 or second voltage V2；
Switching circuit 20, including first input end, the second input terminal, controlled end and output end, the first input end withThe output end of the voltage detection output circuit 10 connects, and second input terminal is connect with the data voltage input terminal, instituteThe controlled end for stating switching circuit 20 is set as the first timing control signal of access and the second timing control signal；The switching circuit20, it is set as exporting the first voltage V1 or the second voltage V2 to display surface according to first timing control signalPlate 200；According to second timing control signal, the data-signal that the source driving chip 100 exports is exported.
In the present embodiment, display panel 200 includes but is not limited to liquid crystal display panel, organic light-emitting diode display facePlate, field emission display panel, Plasmia indicating panel, curved face type panel, the liquid crystal display panel include that tft liquid crystal is aobviousShow panel, TN (Twisted Nematic, twisted nematic) panel, VA (Vertical Alignment, vertical orientation technology)Class panel, IPS (In-Plane Switching, plane conversion) panel etc..
It is connected between source driving chip 100 and display panel 200 by multiple data lines, source driving chip 100 passes throughMultiple data lines export different data-signals into each pixel of display panel 200 respectively, and cooperate grid drive chip400 and sequence controller 50 drive display panel 200 pixel, realize image show, in the present embodiment, pixel be single AsiaPixel.
In the present embodiment, charging circuit 300 is arranged on each data line, when charging circuit 300 is provided with multiple,First voltage V1 input terminal and second voltage V2 input terminal in multiple charging circuits 300 can be arranged in parallel, when needing to chargeFirst voltage V1 and second voltage V2 is obtained from first voltage V1 input terminal and second voltage V2 input terminal are corresponding respectively, to subtractThe connecting line of few charging circuit 300 and the power circuit for being set as output first voltage V1 and second voltage V2 simplifies display dressThe structure set.
First voltage V1 and second voltage V2 can be provided by individual power circuit, or by timing control plate 500Gamma circuit provides, it is to be understood that and each sub-pix of display panel 200 is made of a thin film transistor (TFT) and capacitor,Thin film transistor (TFT) plays the role of equivalent switch, and liquid crystal capacitance and pixel storage capacitor play equivalent capacity together,When display panel 200 is opened line by line, all sub-pixes of the row obtain data-signal from the output end of source driving chip 100,And sub-pix capacitor charging is given, realize that the signal voltage of the pixel is written and keeps, the liquid crystal molecule of subpixel area is in the voltageLower rotation, liquid crystal molecule are that the opposite voltage by sub-pix capacitor both ends is driven, and one end of sub-pix capacitor inputs numberIt is believed that number, the other end is connect with public electrode, and in the present embodiment, first voltage V1 is greater than public electrode voltages Vcom, that is, is positivePolar voltages, it is opposite with public affairs that second voltage V2 is less than public electrode voltages Vcom, as reverse voltage, and first voltage V1The opposite voltage of common-battery pole tension Vcom is equal in magnitude relative to public electrode voltages Vcom with second voltage V2, polarity on the contrary,The voltage for any data signal that source driving chip 100 exports is respectively less than first voltage V1 relative to public electrode voltages VcomRelative to the opposite voltage of public electrode voltages Vcom, and it is all larger than phase of the second voltage V2 relative to public electrode voltages VcomTo voltage, understand to simplify, public electrode voltages Vcom can be equivalent to 0V, then first voltage V1 is V1, second voltageV2 is-V1, and the voltage of the data-signal of the output of source driving chip 100 is between-V1~V1.
In the present embodiment, the first timing control signal and the second timing control signal can be exported by sequence controller 50, orPerson is exported by other control circuits, the period of switching circuit 20 received first timing control signal and the second timing control signalIt can be obtained after many tests during 200 processing procedure of display panel, or pass through voltage acquisition electricity when display panel 200 drivesRoad 40 acquires pixel voltage, and feeds back to control circuit or sequence controller 50, the size of control circuit based on the feedback signalThe first timing control signal of corresponding output and the second timing control signal.
300 specific work process of charging circuit are as follows:
When 100 outputting data signals of source driving chip, voltage detection output circuit 10 detects source driving chip 100The polarity of voltage of the data-signal of output, when the polarity of voltage of data-signal is positive polarity chron, switching circuit 20 is received at this timeFirst timing control signal is connected to first input end and output end, and first voltage V1 is exported to display panel 200, by the first electricityPressing V1 is the pixel quick charge of display panel 200, after a preset time lapses or detects that the pixel of display panel 200 is electricPressure is when charging to the preset range of required voltage, and switching circuit 20 receives the second timing control signal, and by the second input terminalIt is connected to output end, the data-signal exported by source driving chip 100 is that display panel 200 continues to charge to required voltage.
Similarly, when the polarity of voltage of data-signal is negative polarity chron, switching circuit 20 receives the first timing control at this timeSignal communication first input end and output end export second voltage V2 to display panel 200, are display surface by second voltage V2The pixel quick charge of plate 200, after a preset time lapses or needed for detecting that the pixel voltage of display panel 200 charges toWhen the preset range of voltage, switching circuit 20 receives the second timing control signal, and the second input terminal is connected to output end,The data-signal exported by source driving chip 100 is that display panel 200 continues to charge to required voltage.
Switching device or switch chip composition with make-break capacity, such as multiple switch pipe can be used in switching circuit 20Or multiplexer switch, it can specifically be designed, be not particularly limited herein according to the actual situation.
Technical solution of the present invention is inputted by using data voltage input terminal, first voltage V1 input terminal, second voltage V2End, voltage detection output circuit 10 and switching circuit 20 constitute the charging circuit of the pixel quick charge for display panel 200300, in 100 initial power-on of source driving chip, voltage detection output circuit 10 detects the number that source driving chip 100 exportsIt is believed that number voltage, and corresponding output first voltage V1 and second voltage V2, switching circuit 20 receive the first timing control signalAnd be connected to first input end and the first output end, it is the pixel of display panel 200 by first voltage V1 or second voltage V2Quick charge, when the voltage of the pixel of display panel 200 reaches goal-selling voltage by preset time, switching circuit 20 is connectIt receives the second timing control signal and is connected to the second input terminal with output end, and be display panel by source driving chip 100200 pixel charging, and fine charging is completed until charging complete.Charging circuit 300 of the present invention is by the pixel of display panel 200Charging is divided into two stages, and carries out high current fast charge and fine charging respectively, to improve the pixel charging of display panel 200Speed.
As shown in Fig. 2, Fig. 2 is the module diagram of another embodiment of charging circuit of the present invention, it is described to fill in the present embodimentCircuit 300 further include:
Voltage collection circuit 40 is set as acquiring the voltage of the pixel, and corresponding output voltage feedback signal；
Sequence controller 50 is set as exporting the first timing control when the voltage of the pixel is less than goal-selling voltageSignal processed；When the voltage of the pixel is more than or equal to the goal-selling voltage, the second timing control signal is exported.
In the present embodiment, charging circuit 300 can be carried out by directlying adopt the voltage of the pixel of detection display panel 200Charge control, and sequence controller 50 is fed back to, sequence controller 50 is defeated according to the feedback signal that voltage collection circuit 40 exportsCorresponding timing control signal out.
In pixel charging, the voltage that voltage collection circuit 40 collects pixel is less than goal-selling voltage, at this time voltageIt detects output circuit 10 and exports the first input end of first voltage V1 or second voltage V2 to switching circuit 20, sequence controllerTo switching circuit 20, the first input end of switching circuit 20 is connected to 50 the first timing control signals of output with output end, the first electricityPress V1 for pixel charging, when the voltage of pixel charges to goal-selling voltage, sequence controller 50 exports the second timing controlSignal to switching circuit 20, the second input terminal of switching circuit 20 is connected to output end, is filled by source driving chip 100 for pixelElectricity.
In the present embodiment, divider resistance or mutual inductor is can be used in voltage collection circuit 40, specifically can be according to the actual situationIt is selected.
In an alternative embodiment, the voltage of the output end of the goal-selling voltage and the source driving chip 100Ratio range be 0.8 to 0.9.
It in the present embodiment, in order to improve pixel charge efficiency, while avoiding overcharging, by first voltage V1 orWhen two voltage V2 are that pixel charges, the 80%~90% of required voltage only need to be charged to, electricity needed for goal-selling voltage to pixelThe voltage of pressure is completed by source driving chip 100, to improve pixel charge efficiency.
As shown in figure 3, Fig. 3 is the electrical block diagram of 300 1 embodiment of charging circuit of the present invention, the voltage detectingOutput circuit 10 includes:
Voltage comparator circuit 11 is set as the voltage for the data-signal for exporting the source driving chip 100 and presetsReference voltage is compared, and corresponding output control signal；
Power supply switch circuit 12 is set as exporting the first voltage V1 or described the according to the control signal is correspondingTwo voltage V2.
In the present embodiment, predetermined reference voltage is public electrode voltages Vcom, and public electrode voltages Vcom is by power managementIntegrated circuit output, according to the definition of pixel, the voltage value higher than public electrode voltages Vcom is positive voltage, is lower than public electrodeThe voltage value of voltage Vcom is negative voltage, and voltage comparator circuit 11 is by the voltage of 100 output end of source driving chip and presets ginsengVoltage is examined to be compared, and according to predetermined reference voltage judge the voltage of 100 output end of source driving chip for positive polarity stillNegative polarity, is positive polarity chron in the voltage for detecting data-signal, and power supply switch circuit 12 exports first voltage V1 to switchFirst voltage V1 is exported to the pixel of display panel 200 charging for carrying out the first stage by circuit 20, Simultaneous Switching circuit 20,Detect that the voltage of data-signal is negative polarity chron, second voltage V2 is exported to switching circuit 20, opened by power supply switch circuit 12Second voltage V2 is exported the charging to the pixel of display panel 200 and then first stage by powered-down road 20.
In an alternative embodiment, the first voltage V1 and the second voltage V2 are respectively relative to the preset referenceThe opposite voltage swing of voltage is equal, and polarity is on the contrary, the predetermined reference voltage is public electrode voltages Vcom.
In the present embodiment, first voltage V1 is positive polarity voltage, second voltage V2 phase relative to public electrode voltages VcomBe reverse voltage for public electrode voltages Vcom, first voltage V1 and second voltage V2 respectively with public electrode voltages VcomOpposite voltage it is equal and polarity is on the contrary, voltage detection output circuit 10 detects the voltage of 100 output end of source driving chipWhen for positive polarity or negative polarity, the first voltage V1 or second voltage V2 of corresponding output identical polar are that pixel carries out firstThe charging in stage, and the opposite voltage of first voltage V1 and public electrode voltages Vcom be greater than any data signal voltage andThe opposite voltage of the opposite voltage of public electrode voltages Vcom, second voltage V2 and public electrode voltages Vcom are less than arbitrary dataThe voltage of signal and the opposite voltage of public electrode voltages Vcom.
In an alternative embodiment, first voltage V1 and second voltage V2 are exported by gamma circuit, and gamma circuit can be usedGamma resistance string or gamma chip export first voltage V1 and second voltage V2, and gamma circuit exports 14 road reference voltages to sourcePole driving chip 100, the first voltage V1 input terminal and second voltage V2 input terminal of charging circuit 300 directly connect with gamma circuitIt connects, and obtains first voltage V1 and second voltage V2 from gamma circuit, and first voltage V1 is maximum reference voltage, second voltageV2 is minimum reference voltage, and first voltage V1 size is about 15V, and second voltage V2 is about 0.2V.
In an alternative embodiment, voltage comparator circuit 11 includes comparator D1 and predetermined reference voltage input terminal；
The normal phase input end of the comparator D1 is connect with the output end of the source driving chip 100, the comparatorThe inverting input terminal of D1 is connect with the predetermined reference voltage input terminal, and the output end of the comparator D1 is that the voltage comparesThe output end of circuit 11.
In the present embodiment, comparator D1 by the voltage of 100 output end of source driving chip and public electrode voltages Vcom intoRow compares, and when the voltage of 100 output end of source driving chip is greater than public electrode voltages Vcom, indicates source drive core at this timeThe voltage for the data-signal that piece 100 exports is positive polarity, and comparator D1 exports high level, first voltage V1 input terminal to electricity at this timeThe output end connection of pressure detection output circuit 10, and the first input end of switching circuit 20 is connected to output end, first voltageV1 is pixel charging.
When the voltage of 100 output end of source driving chip is less than public electrode voltages Vcom, source drive at this time is indicatedChip 100 export data-signal voltage be negative polarity, at this time comparator D1 export low level, second voltage V2 input terminal withThe output end of voltage detection output circuit 10 is connected to, and the first input end of Simultaneous Switching circuit 20 is connected to output end, the second electricityPress V2 for pixel charging.
In an alternative embodiment, the power supply switch circuit 12 includes first switch tube Q1 and second switch Q2, instituteThe input terminal for stating first switch tube Q1 is connect with the first voltage V1 input terminal, the input terminal of the second switch Q2 and instituteState the connection of second voltage V2 input terminal, the controlled end of the first switch tube Q1, the controlled end of the second switch Q2 and instituteState the output end interconnection of comparator D1, the output end company of the output end of the first switch tube Q1 and the second switch Q2It connects, connecting node is the output end of the power supply switch circuit 12.
In the present embodiment, when voltage comparator circuit 11 exports high level, first switch tube Q1 is connected, and first voltage V1 is defeatedThe output end for entering end to voltage detection output circuit 10 is connected to, and the first input end of switching circuit 20 is connected to output end,First voltage V1 is pixel charging.
When voltage comparator circuit 11 exports low level, second switch Q2 conducting, second voltage V2 input terminal to voltageThe output end connection of output circuit 10 is detected, and the first input end of switching circuit 20 is connected to output end, second voltage V2For pixel charging.
In the present embodiment, first switch tube Q1 is NMOS tube, and second switch Q2 is PMOS tube.
In an alternative embodiment, the switching circuit 20 includes third switching tube Q3 and the 4th switching tube Q4, and described theThe input terminal of three switching tube Q3 is connect with the output end of the voltage detection output circuit 10, the input of the 4th switching tube Q4End is connect with the output end of the source driving chip 100, the output end and the 4th switching tube of the third switching tube Q3The output end of Q4 is connect with the pixel of the display panel 200, the controlled end of the third switching tube Q3 and the 4th switchThe controlled end of pipe Q4 is set as receiving first timing control signal or second timing control signal.
In the present embodiment, between the output end and pixel of third switching tube Q3 concatenation detection output circuit, the 4th switching tubeQ4 is serially connected between source driving chip 100 and pixel, and when pixel starts to charge, voltage detection output circuit 10 is according to source electrodeThe corresponding output first voltage V1 and second voltage V2 of the voltage of the data-signal of driving chip 100, third switching tube Q3 connects at this timeReceive the first timing control signal conducting, the 4th switching tube Q4 receive the first timing control signal shutdown, first voltage V1 orSecond voltage V2 is exported to pixel, when the voltage of pixel reaches goal-selling voltage, when third switching tube Q3 receives secondSequence control signal shutdown, the 4th switching tube Q4 receive the conducting of the second timing control signal, source driving chip 100 and display surfaceThe pixel of plate 200 is connected to and charges.
In the present embodiment, the first timing control signal is high level, and the second timing control signal is low level, and third is openedPass pipe Q3 is NMOS tube, and the 4th switching tube Q4 is PMOS tube, the interval of the first timing control signal and the second timing control signalTime is determined that the interval time can obtain after many tests during 200 processing procedure of display panel by sequence controller 50, orFirst timing control signal and the second timing control signal acquire picture by voltage collection circuit 40 when display panel 200 drivesPlain voltage is simultaneously compared according to pixel voltage with goal-selling, and corresponding output.
As shown in figure 4, Fig. 4 is the invention shows the module diagram of one embodiment of panel drive circuit, the present invention is also mentionedA kind of display panel, drive circuit out, the display panel, drive circuit include timing control plate 500, grid drive chip 400, sourcePole driving chip 100 and charging circuit 300, the specific structure of the charging circuit 300 is referring to above-described embodiment, due to this display surfaceDrive circuit uses whole technical solutions of above-mentioned all embodiments, therefore at least with the technical solution of above-described embodimentBrought all beneficial effects, this is no longer going to repeat them.It wherein, include sequence controller 50, gal on timing control plate 500Horse circuit and power management integrated circuit, power management integrated circuit export digital operation voltage to source driving chip respectively100, grid drive chip 400 and sequence controller 50 generate reference voltage for gamma circuit, and reference voltage turns through gamma circuit14 road reference voltages are exported after changing and are exported to source driving chip 100, and source driving chip 100 is exported according to gamma circuitReference voltage corresponds to output multi-channel data-signal to display panel 200 and charges, while gamma circuit exports first voltage V1Cooperate source driving chip 100 as charge power supply, first voltage V1 and second voltage V2 with second voltage V2 to charging circuitIt is common to complete pixel charging, while source driving chip 100 and grid drive chip 400 realize that the image of display panel 200 is aobviousShow.
The present invention also proposes a kind of display device, which includes display panel 200 and display panel, drive circuit,The specific structure of the display panel, drive circuit is referring to above-described embodiment, since this display device uses above-mentioned all embodimentsWhole technical solutions, therefore at least with above-described embodiment technical solution brought by all beneficial effects, herein no longerIt repeats one by one.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at thisUnder the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectlyIt is included in other related technical areas in scope of patent protection of the invention.