CN104882111A - Display driving circuit, driving method thereof and display device - Google Patents
Display driving circuit, driving method thereof and display device Download PDFInfo
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Abstract
The embodiment of the invention provides a display driving circuit, a driving method thereof and a display device, relates to the technical field of display, and is capable of solving the problem of a lowered display effect caused by an increased TFT leakage current of the display driving circuit. The display driving circuit comprises a grid driving unit, a boost unit, a compensation unit, a waveform generation unit and a monitoring unit. The monitoring unit is connected with the boost unit. The boost unit is further connected with an analog voltage source, the waveform generation unit, the grid driving unit and the compensation unit. The compensation unit is further connected with the analog voltage source, the waveform generation unit and the grid driving unit. The waveform generation unit is further connected with the grid driving unit. The display driving circuit is used for driving the displaying of a display panel.
Description
Technical field
The present invention relates to display technique field, particularly relate to a kind of display driver circuit and driving method, display device.
Background technology
TFT-LCD (Thin Film Transistor Liquid Crystal Display, thin film transistor-liquid crystal display) as a kind of panel display apparatus, because it has the features such as little, low in energy consumption, the radiationless and cost of manufacture of volume is relatively low, and be applied to more and more in the middle of high-performance display field.When TFT-LCD shows, on display panel, the grid line of every a line carries out lining by line scan to open the pixel cell be connected with this row grid line, and data-signal is exported to the pixel cell of unlatching by data line, charges to this pixel cell.The deflection angle being filled with liquid crystal corresponding to the pixel cell of different electricity is not identical yet, thus can show the picture of different GTG.
In order to reduce the production cost of lcd products further, the existing circuit for scanning grid line often adopts GOA (Gate Driver on Array, array base palte row cutting) design TFT (Thin Film Transistor, Thin Film Transistor (TFT)) gate switch circuit is integrated in display panel array base palte on to form the turntable driving to display panel.This gate switch circuit of GOA Integration ofTechnology on array base palte that utilize is also referred to as GOA unit or shift register cell.Adopt the display device of GOA unit owing to eliminating the part of binding driving circuit, therefore not only can reduce cost of products from material cost and manufacture craft two aspect.
GOA unit comprises the shift register of multiple cascade, and the signal output part of each shift register is connected with in TFT-LCD grid.When first order shift register receives frame start signal (English full name: Start Vertical, be called for short: STV), shift register at different levels is at multiple clock signal (English full name Clock Signal, be called for short CLK) and high level, under low level control, export gated sweep signal line by line, to line by line scan to all grid lines.
In order to make GOA unit normally to work, in prior art, frame start signal STV, clock signal clk, high level or low level etc. can be provided by display driver circuit to GOA unit.But when display device work at high operating temperatures time, the leakage current of the TFT in display driver circuit can be caused to increase.Because the driving power W of display driver circuit is constant, from formula W=UI, when the electric current I in display driver circuit increases, can cause the voltage U that display driver circuit provides to GOA unit, such as above-mentioned high level or low level amplitude reduce.So, the grid voltage of the driving transistors in shift register can reduce, thus cause shift register to reduce to make the charge rate of the pixel cell be connected with this row grid line not enough to the gated sweep signal that grid line exports, occur concealed wire or bright line bad, reduce display effect and product quality.
Summary of the invention
Embodiments of the invention provide a kind of display driver circuit and driving method, display device, and the TFT leakage current that can solve due to display driver circuit increases, and causes the problem that display effect reduces.
For achieving the above object, embodiments of the invention adopt following technical scheme:
The one side of the embodiment of the present invention, provides a kind of display driver circuit, comprises drive element of the grid, also comprises boosting unit, compensating unit, waveform generation unit and monitoring unit;
Described monitoring unit connects described boosting unit, for monitoring the running parameter of described boosting unit, when the running parameter of described boosting unit does not meet pre-conditioned, to described boosting unit input control signal;
Described boosting unit is connecting analog voltage source, described waveform generation unit, described drive element of the grid and described compensating unit also, analog voltage for described analog voltage source being inputted converts the first voltage and the second voltage to, and exports described waveform generation unit and described drive element of the grid to; Or, for after described boosting unit receives described control signal, stop boosting work, and to described compensating unit input enable signal;
Described compensating unit also connects described analog voltage source, described waveform generation unit and described drive element of the grid, for after receiving described enable signal, the analog voltage that described analog voltage source inputs is converted to described first voltage and described second voltage, and export described waveform generation unit and described drive element of the grid to;
Described waveform generation unit also connects described drive element of the grid, for receiving described first voltage and described second voltage, delta frame start signal and clock signal, and exports described drive element of the grid to.
Preferably, described compensating unit comprises DC-DC converter.
Further preferred described compensating unit also comprises the first electric capacity and the second electric capacity;
One end of described first electric capacity is connected with described compensating unit, other end ground connection; For storing described first voltage that described compensating unit exports;
One end of described second electric capacity is connected with described compensating unit, other end ground connection; For storing described second voltage that described compensating unit exports.
Preferably, described monitoring unit is used for monitoring the electric current of described boosting unit; Described monitoring unit comprises current monitoring device.
Preferably, described monitoring unit is used for monitoring the output voltage of described boosting unit; Described monitoring unit comprises voltage monitoring device.
Preferably, the amplitude of described first voltage or described second voltage is four times of described analog voltage amplitude.
The another aspect of the embodiment of the present invention, provides a kind of display device, comprises any one display driver circuit as above.
The another aspect of the embodiment of the present invention, there is provided a kind of for driving the method for any one display driver circuit above-mentioned, comprise boosting unit and convert the analog voltage received to the first voltage and the second voltage, and export waveform generation unit and drive element of the grid to;
The running parameter of monitoring unit to described boosting unit is monitored, when the running parameter of described boosting unit does not meet pre-conditioned, to described boosting unit input control signal;
Described boosting unit receives described control signal, stops boosting work, and to compensating unit input enable signal;
Described compensating unit receives described enable signal, described analog voltage is converted to described first voltage and described second voltage, and exports waveform generation unit and drive element of the grid to;
Described waveform generation unit receives described first voltage and described second voltage, delta frame start signal and clock signal, and exports drive element of the grid to.
Preferably, the running parameter of described monitoring unit to described boosting unit is monitored, and when the running parameter of described boosting unit does not meet pre-conditioned, comprises to described boosting unit input control signal:
The electric current of described monitoring unit to described boosting unit is monitored, and when the electric current of described boosting unit is more than or equal to 220mA, inputs described control signal to described boosting unit.
Preferably, the running parameter of described monitoring unit to described boosting unit is monitored, and when the running parameter of described boosting unit does not meet pre-conditioned, comprises to described boosting unit input control signal:
The output voltage of described monitoring unit to described boosting unit is monitored, and when the amplitude of the output voltage of described boosting unit is less than four times of described analog voltage amplitude, inputs described control signal to described boosting unit.
The embodiment of the present invention provides a kind of display driver circuit and driving method, display device, and wherein, described display driver circuit comprises drive element of the grid, boosting unit, compensating unit, waveform generation unit and monitoring unit; Monitoring unit connects boosting unit, for monitoring the running parameter of boosting unit, when the running parameter of boosting unit does not meet pre-conditioned, to boosting unit input control signal; Boosting unit is connecting analog voltage source, waveform generation unit, drive element of the grid and compensating unit also, and the analog voltage for analog voltage source being inputted converts the first voltage and the second voltage to, and exports waveform generation unit and drive element of the grid to; Or, for after boosting unit receives control signal, stop boosting work, and to compensating unit input enable signal; Compensating unit is connecting analog voltage source, waveform generation unit and drive element of the grid also, for after receiving enable signal, convert the analog voltage that analog voltage source inputs to the first voltage and described second voltage, and export waveform generation unit and drive element of the grid to; Waveform generation unit for receiving the first voltage and described second voltage, delta frame start signal and clock signal, and exports drive element of the grid to.
So, when the running parameter of boosting unit meets pre-conditioned, the analog voltage that analog voltage source inputs can be converted to the first voltage for being supplied to waveform generation unit and drive element of the grid and the second voltage by boosting unit.When the running parameter of boosting unit does not meet pre-conditioned, the first voltage exported in order to avoid boosting unit and the amplitude of the second voltage decrease, boosting unit can stop boosting work, make compensating unit that above-mentioned analog voltage is converted to the first voltage and the second voltage by sending enable signal to compensating unit, and export waveform generation unit and gate drive power to, frame start signal and clock signal is provided to drive element of the grid by this waveform generation unit, to make drive element of the grid at the first voltage, second voltage, grid line in display panel can be lined by line scan under the control of frame start signal clock signal.The amplitude of the first voltage and the second voltage can be kept constant by the acting in conjunction of boosting unit and compensating unit, thus the amplitude avoided in the first voltage and the second voltage reduces the voltage magnitude causing drive element of the grid to export reduces, pixel cell charge rate is declined and the bad phenomenon of the display that produces.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of a kind of display driver circuit that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is the concrete structure schematic diagram of GOA unit in Fig. 1;
Fig. 3 is the signal Control timing sequence figure of GOA unit in Fig. 2;
Fig. 4 is the concrete structure schematic diagram of compensating unit in Fig. 1;
The driving method process flow diagram of a kind of display driver circuit that Fig. 5 provides for the embodiment of the present invention.
Accompanying drawing illustrates:
10-monitoring unit; 20-boosting unit; 30-compensating unit; 40-waveform generation unit; 50-analog voltage source.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of display driver circuit, as shown in Figure 1, comprises drive element of the grid (hereinafter referred to as GOA unit), also comprises monitoring unit 10, boosting unit 20, compensating unit 30 and waveform generation unit 40.
Wherein, monitoring unit 10 connects boosting unit 20, for monitoring the running parameter of boosting unit 20, when the running parameter of boosting unit 20 does not meet pre-conditioned, to boosting unit 20 input control signal CS.
Boosting unit 20 goes back connecting analog voltage source 50, waveform generation unit 40, GOA unit and compensating unit 30, analog voltage VCI for analog voltage source 50 being inputted converts the first voltage VGH and the second voltage VGL to, and exports waveform generation unit 40 and GOA unit to.Or, for after boosting unit 20 receives control signal CS, stop boosting work, and input enable signal EN to compensating unit 30.
Compensating unit 30 goes back connecting analog voltage source 50, waveform generation unit 40 and GOA unit, for after receiving enable signal EN, analog voltage VCI analog voltage source 50 inputted converts the first voltage VGH and the second voltage VGL to, and exports waveform generation unit 40 and GOA unit to.
Waveform generation unit 40 also connects GOA unit, for receiving the first voltage VGH and the second voltage VGL, delta frame start signal STV and clock signal clk, and exports GOA unit to.
It should be noted that, first, be with the first voltage VGH for high level in the embodiment of the present invention, the second voltage VGL is low level is the explanation (as shown in Figure 3) that example is carried out.After the analog voltage VCI that general analog voltage source 50 inputs passes through the boost conversion of boosting unit 20 or compensating unit 30, the the first voltage VGH obtained and the amplitude of the second voltage VGL can be the amplitudes of the above-mentioned analog voltage of four times, thus make display driver circuit have higher driving force, carry out work to drive GOA unit.
To for boosting unit 20 and compensating unit 30, boost conversion process is described in detail below:
After boosting unit 20 receives the analog voltage VCI of analog voltage source 50 input, on the one hand, the amplitude of analog voltage is risen twice to convert simulation positive voltage AVDD (AVDD=2VCI) to, then obtain the first voltage VGH (VGH=2AVDD) that amplitude is analog voltage four times the amplitude of simulation positive voltage AVDD is risen twice.On the other hand, analog voltage is converted to simulation negative supply voltage VCL (VCL=-VCI), then the amplitude of simulation negative supply voltage VCL is risen four times and obtain the second voltage VGL (VGL=4VCL).The boost process of compensating unit 30 can be described above, or boosting unit 20 or compensating unit 30 adopt other boosting mode, and the present invention is not restricted this, GOA unit can be driven normally to work as long as the amplitude of analog voltage VCI risen to.
The second, the kind of the present invention to the clock signal clk that waveform generation unit 40 exports does not limit, specifically can be different according to the difference of the shift register in GOA unit.Such as, two kinds of width that can generate as shown in Figure 3 are identical, but the clock signal clk 1 of phase 180 ° and CLK2, or multiple clock signals that width is different with phase place.
Three, above-mentioned boosting work, refers to and converts analog voltage VCI to the first voltage VGH and the second voltage VGL.After boosting unit 20 stops above-mentioned boosting work, analog voltage VCI is no longer converted to the first voltage VGH and the second voltage VGL by boosting unit 20.
4th, above-mentioned GOA unit as shown in Figure 2, can comprise shift register (SR0, SR1 of multiple cascade ... SRn).The frame start signal STV that above-mentioned waveform generation unit 40 provides is inputted by the signal input part INPUT of first order shift register SR0, drives described GOA unit to start working.In addition, except above-mentioned first order shift register SR0, the signal output part OUTPUT of the upper level shift register that the signal input part INPUT of all the other each shift registers is adjacent is connected.So, under the control of the first voltage VGH, the second voltage VGL, clock signal (CLK1 and CLK2), the shift register of cascade can export gated sweep signal (G0, G1 line by line by signal output part OUTPUT ... Gn), to line by line scan to the grid line in display panel.
Certainly, above-mentioned is only illustrating a kind of GOA unit structure, when each shift register in GOA unit is also provided with reset signal input end RESET, except afterbody shift register SR0, the reset signal input end RESET of remaining shift register is connected with the signal output part OUTPUT of next stage shift register.The structure of the present invention to GOA unit does not limit, as long as at the first voltage VGH, the second voltage VGL that boosting unit 20, compensating unit 30 export, and waveform generation unit 40 export frame start signal STV and clock signal clk control under, can the grid line in display panel be lined by line scan.
Five, the dotted line in Fig. 1 and Fig. 4 in the embodiment of the present invention is for representing that boosting unit 20 and compensating unit 30 can not export simultaneously, namely when boosting unit 20 exports the first voltage VGH and the second voltage VGL, compensating unit 30 does not work, when boosting unit 20 stops boosting work, and when sending control signal CS to compensating unit, compensating unit 30 starts, and carries out boosting work, to export the first voltage VGH and the second voltage VGL to waveform generation unit 40 or GOA unit.
The display driver circuit that the embodiment of the present invention provides, comprises drive element of the grid, boosting unit, compensating unit, waveform generation unit and monitoring unit; Monitoring unit connects boosting unit, for monitoring the running parameter of boosting unit, when the running parameter of boosting unit does not meet pre-conditioned, to boosting unit input control signal; Boosting unit is connecting analog voltage source, waveform generation unit, drive element of the grid and compensating unit also, and the analog voltage for analog voltage source being inputted converts the first voltage and the second voltage to, and exports waveform generation unit and drive element of the grid to; Or, for after boosting unit receives control signal, stop boosting work, and to compensating unit input enable signal; Compensating unit is connecting analog voltage source, waveform generation unit and drive element of the grid also, for after receiving enable signal, convert the analog voltage that analog voltage source inputs to the first voltage and described second voltage, and export waveform generation unit and drive element of the grid to; Waveform generation unit for receiving the first voltage and described second voltage, delta frame start signal and clock signal, and exports drive element of the grid to.
So, when the running parameter of boosting unit meets pre-conditioned, the analog voltage that analog voltage source inputs can be converted to the first voltage for being supplied to waveform generation unit and drive element of the grid and the second voltage by boosting unit.When the running parameter of boosting unit does not meet pre-conditioned, the first voltage exported in order to avoid boosting unit and the amplitude of the second voltage decrease, boosting unit can stop boosting work, make compensating unit that above-mentioned analog voltage is converted to the first voltage and the second voltage by sending enable signal to compensating unit, and export waveform generation unit and gate drive power to, frame start signal and clock signal is provided to drive element of the grid by this waveform generation unit, to make drive element of the grid at the first voltage, second voltage, grid line in display panel can be lined by line scan under the control of frame start signal clock signal.The amplitude of the first voltage and the second voltage can be kept constant by the acting in conjunction of boosting unit and compensating unit, thus the amplitude avoided in the first voltage and the second voltage reduces the voltage magnitude causing drive element of the grid to export reduces, pixel cell charge rate is declined and the bad phenomenon of the display that produces.
Below the concrete structure of display driver circuit is described in detail.
As shown in Figure 4, above-mentioned compensating unit 30 can adopt DC-to-dc (English full name: Direct Current-Direct Current, English abbreviation DC-DC) transducer.Realize the amplitude of analog voltage VCI to promote, to be transformed into the first voltage VGH and the second voltage VGL by this DC-DC converter.
In addition, compensating unit 30 can also comprise the first electric capacity C1 and the second electric capacity C2.
Wherein, one end of the first electric capacity C1 is connected with compensating unit 30, other end ground connection.For storing the first voltage VGH that compensating unit 30 exports, thus make the first voltage VGH can continue to export waveform generation unit 40 and GOA unit to.
One end of second electric capacity C2 is connected with compensating unit 30, other end ground connection; For storing the second voltage VGL that compensating unit 30 exports, thus make the second voltage VGL can continue to export waveform generation unit 40 and GOA unit to.
Because the power of boosting unit 20 is constant, from formula W=UI, electric current I can cause the decline of boosting unit 20 output voltage (comprising the first voltage VGH and the second voltage VGL) amplitude while increasing.Therefore the monitoring unit 10 in the embodiment of the present invention can detect the electric current I of boosting unit 20 or output voltage U.When electric current I or output voltage U do not meet pre-conditioned, boosting unit 20 can be made to stop boosting work in time, and compensating unit 30 is opened, replace boosting unit 20 to work, thus guarantee that the amplitude of the first voltage VGH and the second voltage VGL is constant.
On this basis, when monitoring unit 10 is for monitoring the electric current of boosting unit 20, monitoring unit 10 can comprise current monitoring device, such as oscillograph, current monitoring registering instrument etc.
So, when the leakage current of the TFT in boosting unit 20 increases (such as working at high operating temperatures), the rising of the electric current in boosting unit 20 can be monitored by current monitoring device, thus in time to boosting unit 20 input control signal CS, boosting work can be stopped making it.Concrete, such as, when current monitoring device detects that the electric current of boosting unit 20 is more than or equal to 200mA, current monitoring device is to boosting unit 20 input control signal CS.Due to when the electric current of boosting unit 20 is more than or equal to 200mA, the first voltage VGH of the output of boosting unit 20 and the amplitude of the second voltage VGL can be caused obviously to reduce.
In addition, the output voltage (comprising the first voltage VGH and the second voltage VGL) that monitoring unit 10 may be used for boosting unit 20 is monitored.Monitoring unit 10 can comprise voltage monitoring device, such as voltage table or electrostatic charge detector etc.
So, when the leakage current of the TFT in boosting unit 20 increases (such as working at high operating temperatures), the amplitude of the first voltage VGH and the second voltage VGL that can monitor boosting unit 20 output by voltage monitoring device decreases relative to preset value, thus in time to boosting unit 20 input control signal CS, boosting work can be stopped making it.In order to provide higher driving voltage, the amplitude of the first voltage VGH that boosting unit 20 exports and the second voltage VGL can be four times of analog voltage VCI amplitude, and therefore above-mentioned preset value can be four times of analog voltage VCI amplitude.When the amplitude of the first voltage VGH and the second voltage VGL that voltage monitoring device monitors boosting unit 20 output is less than four times of analog voltage VCI amplitude, to boosting unit 20 input control signal CS, stop boosting work to make it.
It should be noted that, which kind of no matter by mode, boosting unit 20 is monitored, after boosting unit 20 stops boosting work, capital sends enable signal EN to compensating unit 30, thus compensating unit 30 replaces boosting unit 20 to continue boosting work, and export the first voltage VGH exported and the second voltage VGL to waveform generation unit 40 and GOA unit.
The embodiment of the present invention provides a kind of display device, comprises any one display driver circuit as above.There is the identical structure of display driver circuit that previous embodiment provides and beneficial effect, because previous embodiment is described in detail the structure of display driver circuit and beneficial effect, repeat no more herein.
In addition, in embodiments of the present invention, display device specifically can comprise liquid crystal indicator, and such as this display device can be any product or parts with Presentation Function such as liquid crystal display, LCD TV, digital album (digital photo frame), mobile phone or panel computer.
The embodiment of the present invention provides a kind of for driving the method for any one display driver circuit above-mentioned, as shown in Figure 5, can comprise:
After the analog voltage VCI that the analog voltage source 50 received exports by S101, boosting unit 20, convert the first voltage VGH and the second voltage VGL to, and export waveform generation unit 40 to, also export the first voltage VGH and the second voltage VGL to GOA unit simultaneously.
So, the the first voltage VGH received and the second voltage VGL can be converted to frame start signal STV and clock signal clk by waveform generation unit 40, make the first voltage VGH, the second voltage VGL that GOA unit exports at boosting unit 20, and waveform generation unit 40 export frame start signal STV and clock signal clk control under, can the grid line in display panel be lined by line scan.
S102, monitoring unit 10 can be monitored the running parameter of boosting unit 20, when the running parameter of boosting unit 20 does not meet pre-conditioned, to boosting unit 20 input control signal CS.
S103, boosting unit 20 receive control signal CS, stop boosting work, and to compensating unit input enable signal EN.
So, because boosting unit 20 stops boosting work, the amplitude of the first voltage VGH because boosting unit 20 exports and the second voltage VGL can be avoided to reduce, and the display caused is bad.
S104, compensating unit 30 receive EN after enable signal, analog voltage VCI are converted to the first voltage VGH and the second voltage VGL, and export waveform generation unit 40 and GOA unit to.
So, compensating unit 30 can be made to replace boosting unit 20 to continue to provide the first voltage VGH and the second voltage VGL to waveform generation unit 40 and GOA unit.
S105, waveform generation unit 40 receive the first voltage VGH and described second voltage VGL, delta frame start signal STV and clock signal clk, and export GOA unit to.
The driving method of the display driver circuit that the embodiment of the present invention provides, first, boosting unit converts the analog voltage received to the first voltage and the second voltage, and exports waveform generation unit and GOA unit to; Next, the running parameter of monitoring unit to boosting unit is monitored, when the running parameter of boosting unit does not meet pre-conditioned, to boosting unit input control signal; Next, boosting unit receives control signal, stops boosting work, and to compensating unit input enable signal; Next, compensating unit receives described enable signal, analog voltage is converted to the first voltage and the second voltage, and exports waveform generation unit and GOA unit to; Finally, waveform generation unit receives the first voltage and the second voltage, delta frame start signal and clock signal, and exports GOA unit to.
So, when the running parameter of boosting unit meets pre-conditioned, the analog voltage that analog voltage source inputs can be converted to the first voltage for being supplied to waveform generation unit and drive element of the grid and the second voltage by boosting unit.When the running parameter of boosting unit does not meet pre-conditioned, the first voltage exported in order to avoid boosting unit and the amplitude of the second voltage decrease, boosting unit can stop boosting work, make compensating unit that above-mentioned analog voltage is converted to the first voltage and the second voltage by sending enable signal to compensating unit, and export waveform generation unit and gate drive power to, frame start signal and clock signal is provided to drive element of the grid by this waveform generation unit, to make drive element of the grid at the first voltage, second voltage, grid line in display panel can be lined by line scan under the control of frame start signal clock signal.The amplitude of the first voltage and the second voltage can be kept constant by the acting in conjunction of boosting unit and compensating unit, thus the amplitude avoided in the first voltage and the second voltage reduces the voltage magnitude causing drive element of the grid to export reduces, pixel cell charge rate is declined and the bad phenomenon of the display that produces.
Because the power of boosting unit 20 is constant, have formula W=UI known, electric current I can cause the decline of boosting unit 20 output voltage (comprising the first voltage VGH and the second voltage VGL) amplitude while increasing.Therefore the monitoring unit 10 in the embodiment of the present invention can detect the electric current I of boosting unit 20 or output voltage U, when electric current I or output voltage U do not meet pre-conditioned, boosting unit 20 can be made to stop boosting work in time, and compensating unit 30 is opened, replace boosting unit 20 to work, thus guarantee that the amplitude of the first voltage VGH and the second voltage VGL is constant.Based on this, below step S102 is described in detail.
Such as, due to when the electric current of boosting unit 20 is more than or equal to 200mA, the first voltage VGH of the output of boosting unit 20 and the amplitude of the second voltage VGL can be caused obviously to reduce.On this basis, above-mentioned monitoring unit 10 can be monitored the electric current of boosting unit 10, when the electric current of boosting unit 10 is more than or equal to 220mA, to boosting unit 20 input control signal CS, can stop boosting work to make boosting unit 20.
Wherein, monitoring unit 10 can comprise current monitoring device, such as oscillograph, current monitoring registering instrument etc.
Again such as, in order to provide higher driving voltage, the amplitude of the first voltage VGH that boosting unit 20 exports and the second voltage VGL can be four times of analog voltage VCI amplitude, and therefore above-mentioned preset value can be four times of analog voltage VCI amplitude.On this basis, the output voltage (comprise first voltage VGH and second voltage VGL) of monitoring unit 10 to described boosting unit 20 is monitored, when the amplitude of the output voltage of boosting unit 20 is less than four times of analog voltage VCI amplitude, to boosting unit 20 input control signal CS, stop boosting work to make it.
Certainly, which kind of no matter by mode, boosting unit 20 is monitored, after boosting unit 20 stops boosting work, capital sends enable signal EN to compensating unit 30, thus compensating unit 30 replaces boosting unit 20 to continue boosting work, and export the first voltage VGH exported and the second voltage VGL to waveform generation unit 40 and GOA unit.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (10)
1. a display driver circuit, comprises drive element of the grid, it is characterized in that, also comprises boosting unit, compensating unit, waveform generation unit and monitoring unit;
Described monitoring unit connects described boosting unit, for monitoring the running parameter of described boosting unit, when the running parameter of described boosting unit does not meet pre-conditioned, to described boosting unit input control signal;
Described boosting unit is connecting analog voltage source, described waveform generation unit, described drive element of the grid and described compensating unit also, analog voltage for described analog voltage source being inputted converts the first voltage and the second voltage to, and exports described waveform generation unit and described drive element of the grid to; Or, for after described boosting unit receives described control signal, stop boosting work, and to described compensating unit input enable signal;
Described compensating unit also connects described analog voltage source, described waveform generation unit and described drive element of the grid, for after receiving described enable signal, the analog voltage that described analog voltage source inputs is converted to described first voltage and described second voltage, and export described waveform generation unit and described drive element of the grid to;
Described waveform generation unit also connects described drive element of the grid, for receiving described first voltage and described second voltage, delta frame start signal and clock signal, and exports described drive element of the grid to.
2. display driver circuit according to claim 1, is characterized in that, described compensating unit comprises DC-DC converter.
3. display driver circuit according to claim 2, is characterized in that, described compensating unit also comprises the first electric capacity and the second electric capacity;
One end of described first electric capacity is connected with described compensating unit, other end ground connection; For storing described first voltage that described compensating unit exports;
One end of described second electric capacity is connected with described compensating unit, other end ground connection; For storing described second voltage that described compensating unit exports.
4. display driver circuit according to claim 1, is characterized in that, described monitoring unit is used for monitoring the electric current of described boosting unit; Described monitoring unit comprises current monitoring device.
5. display driver circuit according to claim 1, is characterized in that, described monitoring unit is used for monitoring the output voltage of described boosting unit; Described monitoring unit comprises voltage monitoring device.
6. the display driver circuit according to any one of claim 1-5, is characterized in that, the amplitude of described first voltage or described second voltage is four times of described analog voltage amplitude.
7. a display device, is characterized in that, comprises the display driver circuit as described in any one of claim 1-6.
8. for driving a method for any one of claim 1-6 display driver circuit, it is characterized in that, comprising:
Boosting unit converts the analog voltage received to the first voltage and the second voltage, and exports waveform generation unit and drive element of the grid to;
The running parameter of monitoring unit to described boosting unit is monitored, when the running parameter of described boosting unit does not meet pre-conditioned, to described boosting unit input control signal;
Described boosting unit receives described control signal, stops boosting work, and to compensating unit input enable signal;
Described compensating unit receives described enable signal, described analog voltage is converted to described first voltage and described second voltage, and exports waveform generation unit and drive element of the grid to;
Described waveform generation unit receives described first voltage and described second voltage, delta frame start signal and clock signal, and exports drive element of the grid to.
9. the driving method of display driver circuit according to claim 8, it is characterized in that, the running parameter of described monitoring unit to described boosting unit is monitored, and when the running parameter of described boosting unit does not meet pre-conditioned, comprises to described boosting unit input control signal:
The electric current of described monitoring unit to described boosting unit is monitored, and when the electric current of described boosting unit is more than or equal to 220mA, inputs described control signal to described boosting unit.
10. the driving method of display driver circuit according to claim 8, it is characterized in that, the running parameter of described monitoring unit to described boosting unit is monitored, and when the running parameter of described boosting unit does not meet pre-conditioned, comprises to described boosting unit input control signal:
The output voltage of described monitoring unit to described boosting unit is monitored, and when the amplitude of the output voltage of described boosting unit is less than four times of described analog voltage amplitude, inputs described control signal to described boosting unit.
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