CN104882111B - A kind of display driver circuit and its driving method, display device - Google Patents
A kind of display driver circuit and its driving method, display device Download PDFInfo
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Abstract
The embodiment of the present invention provides a kind of display driver circuit and its driving method, display device, is related to display technology field, and can solve the problem that is increased due to the TFT leakage currents of display driver circuit, the problem for causing display effect to reduce.Including drive element of the grid, boosting unit, compensating unit, waveform signal generating unit and monitoring unit.Monitoring unit connects boosting unit, and boosting unit is also connected with analog voltage source, waveform signal generating unit, drive element of the grid and compensating unit；Compensating unit is also connected with analog voltage source, waveform signal generating unit and drive element of the grid；Waveform signal generating unit is also connected with drive element of the grid.For driving display floater to be shown.
Description
Technical field
The present invention relates to display technology field, more particularly to a kind of display driver circuit and its driving method, display device.
Background technology
(Thin Film Transistor Liquid Crystal Display, TFT-LCD show TFT-LCD
Show device) as a kind of panel display apparatus, because which has small volume, low in energy consumption, radiationless and cost of manufacture relatively low
Feature, and be applied in the middle of high-performance display field more and more.It is when TFT-LCD is shown, every on display floater
The grid line of a line is progressively scanned to open the pixel cell that is connected with the row grid line, data wire by data signal export to
The pixel cell of unlatching, is charged to the pixel cell.It is filled with the deflection angle of the corresponding liquid crystal of pixel cell of different electricity
Degree is also differed, such that it is able to show the picture of different GTGs.
In order to further reduce the production cost of lcd products, the existing circuit for being scanned to grid line
Frequently with GOA (Gate Driver on Array, array base palte row drive) designs by TFT (Thin Film Transistor,
TFT) gate switch circuit is integrated on the array base palte of display floater to form scanning to display floater
Drive.Gate switch circuit of this utilization GOA Integration ofTechnologies on array base palte is also referred to as GOA unit or shift register list
Unit.Display device using GOA unit due to eliminating the part of binding drive circuit, therefore not only can from material cost and
Product cost is reduced in terms of processing technology two.
GOA unit includes the shift register of multiple cascades, the signal output part and TFT- of each shift register
A grid in LCD is connected.When first order shift register receives frame start signal (English full name：Start
Vertical, referred to as：STV, after), shift registers at different levels are in multiple clock signals (English full name Clock Signal, abbreviation
CLK) and under high level, low level control, gated sweep signal is exported line by line, to progressively scan to all grid lines.
In order that GOA unit can normal work, can be carried to GOA unit by display driver circuit in prior art
For frame start signal STV, clock signal clk, high level or low level etc..But when display device works at high operating temperatures
When, the leakage current increase of the TFT in display driver circuit can be caused.Due to driving power W of display driver circuit it is constant, by public affairs
Formula W=UI understands, when the electric current I in display driver circuit increases, the electricity that display driver circuit can be caused to provide to GOA unit
Pressure U, such as above-mentioned high level or low level amplitude are reduced.So, the grid of the driving transistor in shift register
Voltage can be reduced, so as to cause shift register to reduce so that being connected with the row grid line to the gated sweep signal that grid line is exported
Pixel cell charge rate it is not enough, there is concealed wire or bright line be bad, reduce display effect and product quality.
The content of the invention
Embodiments of the invention provide a kind of display driver circuit and its driving method, display device, can solve the problem that due to
The TFT leakage currents of display driver circuit increase, the problem for causing display effect to reduce.
To reach above-mentioned purpose, embodiments of the invention are adopted the following technical scheme that：
The one side of the embodiment of the present invention, there is provided a kind of display driver circuit, including drive element of the grid, also including boosting
Unit, compensating unit, waveform signal generating unit and monitoring unit；
The monitoring unit connects the boosting unit, for being monitored to the running parameter of the boosting unit, when
When the running parameter of the boosting unit is unsatisfactory for pre-conditioned, control signal is input into the boosting unit；
The boosting unit is also connected with analog voltage source, the waveform signal generating unit, the drive element of the grid and institute
Compensating unit is stated, for the analog voltage that the analog voltage source is input into is converted into first voltage and second voltage, and is exported
To the waveform signal generating unit and the drive element of the grid；Or, for receiving the control letter when the boosting unit
After number, stop boosting work, and signal is enabled to compensating unit input；
The compensating unit is also connected with the analog voltage source, the waveform signal generating unit and the raster data model list
Unit, for, after the enable signal is received, the analog voltage that the analog voltage source is input into being converted into described first electric
Pressure and the second voltage, and export to the waveform signal generating unit and the drive element of the grid；
The waveform signal generating unit is also connected with the drive element of the grid, for receiving the first voltage and described second
Voltage, generates frame start signal and clock signal, and exports to the drive element of the grid.
Preferably, the compensating unit includes DC-DC converter.
The further preferred compensating unit also includes the first electric capacity and the second electric capacity；
One end of first electric capacity is connected with the compensating unit, other end ground connection；It is single for storing the compensation
The first voltage of unit's output；
One end of second electric capacity is connected with the compensating unit, other end ground connection；It is single for storing the compensation
The second voltage of unit's output.
Preferably, the monitoring unit is for being monitored to the electric current of the boosting unit；The monitoring unit includes
Current monitoring device.
Preferably, the monitoring unit is for being monitored to the output voltage of the boosting unit；The monitoring unit
Including voltage monitoring device.
Preferably, the amplitude of the first voltage or the second voltage is four times of the analog voltage amplitude.
A kind of another aspect of the embodiment of the present invention, there is provided display device, drives including any one display as above
Galvanic electricity road.
A kind of another aspect of the embodiment of the present invention, there is provided side for driving above-mentioned any one display driver circuit
Method, including the analog voltage for receiving is converted into first voltage and second voltage by boosting unit, and export to waveform generate it is single
Unit and drive element of the grid；
Monitoring unit is monitored to the running parameter of the boosting unit, when the running parameter of the boosting unit is discontented with
When foot is pre-conditioned, control signal is input into the boosting unit；
The boosting unit receives the control signal, stops boosting work, and enables signal to compensating unit input；
The compensating unit receives the enable signal, and the analog voltage is converted into the first voltage and described
Second voltage, and export to waveform signal generating unit and drive element of the grid；
The waveform signal generating unit receives the first voltage and the second voltage, generates frame start signal and clock
Signal, and export to drive element of the grid.
Preferably, the monitoring unit is monitored to the running parameter of the boosting unit, when the boosting unit
When running parameter is unsatisfactory for pre-conditioned, include to boosting unit input control signal：
The monitoring unit is monitored to the electric current of the boosting unit, when the electric current of the boosting unit is more than or equal to
During 220mA, the control signal is input into the boosting unit.
Preferably, the monitoring unit is monitored to the running parameter of the boosting unit, when the boosting unit
When running parameter is unsatisfactory for pre-conditioned, include to boosting unit input control signal：
The monitoring unit is monitored to the output voltage of the boosting unit, when the output voltage of the boosting unit
Amplitude less than four times of the analog voltage amplitude when, be input into the control signal to the boosting unit.
The embodiment of the present invention provides a kind of display driver circuit and its driving method, display device, wherein, described display is driven
Galvanic electricity road includes drive element of the grid, boosting unit, compensating unit, waveform signal generating unit and monitoring unit；Monitoring unit connects
Boosting unit is connect, for being monitored to the running parameter of boosting unit, when the running parameter of boosting unit is unsatisfactory for default bar
During part, control signal is input into boosting unit；Boosting unit is also connected with analog voltage source, waveform signal generating unit, raster data model list
Unit and compensating unit, the analog voltage for analog voltage source is input into is converted into first voltage and second voltage, and exports
To waveform signal generating unit and drive element of the grid；Or, for after boosting unit receives control signal, stopping boosting work
Make, and signal is enabled to compensating unit input；Compensating unit is also connected with analog voltage source, waveform signal generating unit and raster data model
Unit, for when receive enable signal after, the analog voltage that analog voltage source is input into is converted into into first voltage and described the
Two voltages, and export to waveform signal generating unit and drive element of the grid；Waveform signal generating unit is used to receive first voltage and described
Second voltage, generates frame start signal and clock signal, and exports to drive element of the grid.
So, when the running parameter of boosting unit meets pre-conditioned, boosting unit can be by analog voltage source
The first voltage and second that the analog voltage of input is converted to for being supplied to waveform signal generating unit and drive element of the grid is electric
Pressure.When the running parameter of boosting unit is unsatisfactory for pre-conditioned, in order to avoid the first voltage and second of boosting unit output
The amplitude of voltage decreases, and boosting unit can stop work of boosting, and causes to mend by sending enable signal to compensating unit
Repay unit and above-mentioned analog voltage is converted to into first voltage and second voltage, and export to waveform signal generating unit and raster data model electricity
Source, provides frame start signal and clock signal to drive element of the grid by the waveform signal generating unit, so that raster data model list
Unit the grid line in display floater can be carried out under first voltage, second voltage, the control of frame start signal clock signal by
Row scanning.The amplitude of first voltage and second voltage can be kept constant by the collective effect of boosting unit and compensating unit,
So as to the amplitude avoided in first voltage and second voltage reduces causing the voltage magnitude of drive element of the grid output to reduce, make
Obtain pixel cell charge rate to decline and the bad phenomenon of the display of generation.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of structural representation of display driver circuit provided in an 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 sequential figure of GOA unit in Fig. 2；
Fig. 4 is the concrete structure schematic diagram of compensating unit in Fig. 1；
Fig. 5 is a kind of driving method flow chart of display driver circuit provided in an embodiment of the present invention.
Description of the drawings：
10- monitoring units；20- boosting units；30- compensating units；40- waveform signal generating units；50- analog voltage sources.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs 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, including drive element of the grid (hereinafter referred to as
GOA unit), also including monitoring unit 10, boosting unit 20, compensating unit 30 and waveform signal generating unit 40.
Wherein, the connection of monitoring unit 10 boosting unit 20, for being monitored to the running parameter of boosting unit 20, works as liter
When the running parameter of pressure unit 20 is unsatisfactory for pre-conditioned, control signal CS is input into boosting unit 20.
Boosting unit 20 is also connected with analog voltage source 50, waveform signal generating unit 40, GOA unit and compensating unit 30, uses
First voltage VGH and second voltage VGL are converted in the analog voltage VCI for being input into analog voltage source 50, and are exported to waveform
Signal generating unit 40 and GOA unit.Or, for after boosting unit 20 receives control signal CS, stop boosting work, and to
The input of compensating unit 30 enables signal EN.
Compensating unit 30 is also connected with analog voltage source 50, waveform signal generating unit 40 and GOA unit, makes for working as to receive
After energy signal EN, the analog voltage VCI that analog voltage source 50 is input into is converted into first voltage VGH and second voltage VGL, and defeated
Go out to waveform signal generating unit 40 and GOA unit.
Waveform signal generating unit 40 is also connected with GOA unit, and for receiving first voltage VGH and second voltage VGL, delta frame rises
Beginning signal STV and clock signal clk, and export to GOA unit.
It should be noted that being that second voltage VGL is with first voltage VGH as high level in the first, embodiment of the present invention
The explanation (as shown in Figure 3) carried out as a example by low level.The analog voltage VCI of the general input of analog voltage source 50 passes through boosting unit
20 or compensating unit 30 boost conversion after, first voltage VGH for obtaining and the amplitude of second voltage VGL can be four times upper
The amplitude of analog voltage is stated, so that display driver circuit has higher driving force, to drive GOA unit to be operated.
Below to being described in detail to boost conversion process by taking boosting unit 20 and compensating unit 30 as an example：
After boosting unit 20 receives the analog voltage VCI of the input of analog voltage source 50, on the one hand, by analog voltage
Amplitude rises twice to be converted into simulating positive voltage AVDD (AVDD=2VCI), then by simulation positive voltage AVDD's
Amplitude rises twice and obtains first voltage VGH (VGH=2AVDD) that amplitude is four times of analog voltage.On the other hand, by analog voltage
Simulation negative supply voltage VCL (VCL=-VCI) is converted to, the amplitude of simulation negative supply voltage VCL is risen into four times then and is obtained the
Two voltage VGL (VGL=4VCL).The boost process of compensating unit 30 can be with as described above, or boosting unit 20 or compensation list
Unit 30 adopts other boosting modes, the invention is not limited in this regard, as long as the amplitude of analog voltage VCI is risen to can drive
GOA unit carries out normal work.
Secondth, the present invention is not limited to the species of the clock signal clk of the output of waveform signal generating unit 40, specifically can be with root
According to the different and different of the shift register in GOA unit.For example, as shown in Figure 3 two kind width can be generated identical, but phase
The clock signal clk 1 and CLK2 of 180 ° of position difference, or multiple clock signals that width is different with phase place.
3rd, above-mentioned boosting work, refers to and for analog voltage VCI to be converted into first voltage VGH and second voltage VGL.When
After boosting unit 20 stops above-mentioned boosting work, analog voltage VCI is no longer converted into first voltage VGH and by boosting unit 20
Two voltage VGL.
4th, above-mentioned GOA unit as shown in Fig. 2 can include multiple cascades shift register (SR0,
SR1……SRn).Letter of frame start signal STV that above-mentioned waveform signal generating unit 40 is provided by first order shift register SR0
Number input INPUT input, drives the GOA unit to start working.Additionally, in addition to above-mentioned first order shift register SR0,
The signal output part of the upper level shift register that the signal input part INPUT of remaining each shift register is adjacent
OUTPUT is connected.So, under first voltage VGH, second voltage VGL, the control of 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), progressively scanning to the grid line in display floater.
Certainly, above-mentioned is only to a kind of illustration of GOA unit structure, when each shift LD in GOA unit
When device is additionally provided with reset signal input RESET, in addition to afterbody shift register SR0, remaining shift LD
The reset signal input RESET of device is connected with the signal output part OUTPUT of next stage shift register.The present invention is to GOA
The structure of unit is not limited, as long as in boosting unit 20, first voltage VGH of the output of compensating unit 30, second voltage VGL,
And under the control of frame start signal STV and clock signal clk of the output of waveform signal generating unit 40, can be in display floater
Grid line is progressively scanned.
5th, the dotted line in the Fig. 1 and Fig. 4 in the embodiment of the present invention is used to represent boosting unit 20 and compensating unit 30 not
Can export simultaneously, i.e., when boosting unit 20 exports first voltage VGH and second voltage VGL, compensating unit 30 does not work, and works as liter
Pressure unit 20 stop boosting work, and to compensating unit send control signal CS when, compensating unit 30 starts, and carries out boosting work
Make, with to waveform signal generating unit 40 or GOA unit output first voltage VGH and second voltage VGL.
Display driver circuit provided in an embodiment of the present invention, including drive element of the grid, boosting unit, compensating unit, ripple
Shape signal generating unit and monitoring unit；Monitoring unit connects boosting unit, for being monitored to the running parameter of boosting unit,
When the running parameter of boosting unit is unsatisfactory for pre-conditioned, control signal is input into boosting unit；Boosting unit is also connected with mould
Intend voltage source, waveform signal generating unit, drive element of the grid and compensating unit, for the analog voltage for being input into analog voltage source
First voltage and second voltage are converted into, and are exported to waveform signal generating unit and drive element of the grid；Or, for when boosting list
After unit receives control signal, stop boosting work, and signal is enabled to compensating unit input；Compensating unit is also connected with simulation electricity
Potential source, waveform signal generating unit and drive element of the grid, for after enable signal is received, by the mould of analog voltage source input
Intend voltage conversion into first voltage and the second voltage, and export to waveform signal generating unit and drive element of the grid；Waveform is given birth to
It is used to receive first voltage and the second voltage into unit, generates frame start signal and clock signal, and export to grid
Driver element.
So, when the running parameter of boosting unit meets pre-conditioned, boosting unit can be by analog voltage source
The first voltage and second that the analog voltage of input is converted to for being supplied to waveform signal generating unit and drive element of the grid is electric
Pressure.When the running parameter of boosting unit is unsatisfactory for pre-conditioned, in order to avoid the first voltage and second of boosting unit output
The amplitude of voltage decreases, and boosting unit can stop work of boosting, and causes to mend by sending enable signal to compensating unit
Repay unit and above-mentioned analog voltage is converted to into first voltage and second voltage, and export to waveform signal generating unit and raster data model electricity
Source, provides frame start signal and clock signal to drive element of the grid by the waveform signal generating unit, so that raster data model list
Unit the grid line in display floater can be carried out under first voltage, second voltage, the control of frame start signal clock signal by
Row scanning.The amplitude of first voltage and second voltage can be kept constant by the collective effect of boosting unit and compensating unit,
So as to the amplitude avoided in first voltage and second voltage reduces causing the voltage magnitude of drive element of the grid output to reduce, make
Obtain pixel cell charge rate to decline and the bad phenomenon of the display of generation.
Hereinafter 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) changer.Realized the amplitude of analog voltage VCI by the DC-DC converter
Lifted, to be transformed into first voltage VGH and second voltage VGL.
Additionally, compensating unit 30 can also include 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 compensating unit 30
First voltage VGH of output, so that first voltage VGH persistently can be exported to waveform signal generating unit 40 and GOA unit.
One end of second electric capacity C2 is connected with compensating unit 30, other end ground connection；Export for storing compensating unit 30
Second voltage VGL so that second voltage VGL persistently can be exported to waveform signal generating unit 40 and GOA unit.
As the power of boosting unit 20 is constant, from formula W=UI, while electric current I increases, boosting can be caused
The decline of 20 output voltage of unit (including first voltage VGH and second voltage VGL) amplitude.Therefore the prison in the embodiment of the present invention
Control unit 10 can be detected to the electric current I of boosting unit 20 or output voltage U.When electric current I or output voltage U be unsatisfactory for it is pre-
If during condition, enabling to boosting unit 20 and stopping boosting work in time, and compensating unit 30 is opened, replace boosting unit
20 work, so that it is guaranteed that the amplitude of first voltage VGH and second voltage VGL is constant.
On this basis, when monitoring unit 10 is for being monitored to the electric current of boosting unit 20, monitoring unit 10 can
With including current monitoring device, such as oscillograph, current monitoring monitor etc..
So, (for example work at high operating temperatures) when the leakage current of the TFT in boosting unit 20 increases, can be with
The rising of the electric current in boosting unit 20 is monitored by current monitoring device, such that it is able to control to the input of boosting unit 20 in time
Signal CS processed, so which stops boosting work.Specifically, the electric current for for example detecting boosting unit 20 when current monitoring device is big
When equal to 200mA, current monitoring device is input into control signal CS to boosting unit 20.Due to when boosting unit 20 electric current it is big
When equal to 200mA, the amplitude of first voltage VGH and second voltage VGL of the output of boosting unit 20 can be caused substantially to reduce.
Additionally, monitoring unit 10 can be used for the output voltage to boosting unit 20 (includes first voltage VGH and second electric
Pressure VGL) it is monitored.Monitoring unit 10 can include voltage monitoring device, such as voltmeter or electrostatic charge detector etc..
So, (for example work at high operating temperatures) when the leakage current of the TFT in boosting unit 20 increases, can be with
Monitor the amplitude of first voltage VGH and second voltage VGL of the output of boosting unit 20 relative to pre- by voltage monitoring device
If value decreases, such that it is able to be input into control signal CS to boosting unit 20 in time, so which stops boosting work.In order to carry
For higher driving voltage, the amplitude of first voltage VGH and second voltage VGL of the output of boosting unit 20 can be analog voltage
Four times of VCI amplitudes, therefore above-mentioned preset value can be four times of analog voltage VCI amplitudes.When voltage monitoring device is monitored
When the amplitude of first voltage VGH and second voltage VGL of the output of boosting unit 20 is less than four times of analog voltage VCI amplitudes, to
Boosting unit 20 is input into control signal CS, so which stops boosting work.
It should be noted that no matter boosting unit 20 is monitored by which kind of mode, when boosting unit 20 stops rising
After pressure work, all enable signal EN can be sent to compensating unit 30, so as to compensating unit 30 replaces boosting unit 20 to continue boosting
Work, and first voltage VGH and second voltage VGL of output are exported to waveform signal generating unit 40 and GOA unit.
The embodiment of the present invention provides a kind of display device, including any one display driver circuit as above.Have
Display driver circuit identical structure and beneficial effect that previous embodiment is provided, as previous embodiment is driven to showing
The structure and beneficial effect of circuit is described in detail, and here is omitted.
Additionally, in embodiments of the present invention, display device can specifically include liquid crystal indicator, such as display device
Can for any product with display function such as liquid crystal display, LCD TV, DPF, mobile phone or panel computer or
Part.
The embodiment of the present invention provides a kind of method for driving above-mentioned any one display driver circuit, as shown in figure 5,
Can include：
After the analog voltage VCI that the analog voltage source 50 for receiving is exported by S101, boosting unit 20, first is converted into electric
Pressure VGH and second voltage VGL, and export to waveform signal generating unit 40, while will also be first voltage VGH and second voltage VGL defeated
Go out to GOA unit.
So, first voltage VGH for receiving and second voltage VGL can be changed by waveform signal generating unit 40
Into frame start signal STV and clock signal clk so that first voltage VGH that GOA unit is exported in boosting unit 20, second
Under voltage VGL, and the control of frame start signal STV and clock signal clk of the output of waveform signal generating unit 40, can be to showing
Grid line in panel is progressively scanned.
S102, monitoring unit 10 can be monitored to the running parameter of boosting unit 20, when the work of boosting unit 20
When parameter is unsatisfactory for pre-conditioned, control signal CS is input into boosting unit 20.
S103, boosting unit 20 receive control signal CS, stop boosting work, and enable signal to compensating unit input
EN。
So, as boosting unit 20 stops boosting work, first due to the output of boosting unit 20 can be avoided
The amplitude of voltage VGH and second voltage VGL is reduced, caused to show bad.
S104, compensating unit 30 receive EN after enable signal, and analog voltage VCI is converted into first voltage VGH and the
Two voltage VGL, and export to waveform signal generating unit 40 and GOA unit.
So, compensating unit 30 can be caused to replace boosting unit 20 to continue mono- to waveform signal generating unit 40 and GOA
Unit provides first voltage VGH and second voltage VGL.
S105, waveform signal generating unit 40 receive first voltage VGH and second voltage VGL, generate frame start signal STV
And clock signal clk, and export to GOA unit.
The driving method of display driver circuit provided in an embodiment of the present invention, first, boosting unit is by the simulation for receiving
Voltage conversion is into first voltage and second voltage, and exports to waveform signal generating unit and GOA unit；Next, monitoring unit pair
The running parameter of boosting unit is monitored, when the running parameter of boosting unit is unsatisfactory for pre-conditioned, defeated to boosting unit
Enter control signal；Next, boosting unit receives control signal, stop boosting work, and letter is enabled to compensating unit input
Number；Next, compensating unit receives the enable signal, analog voltage is converted into into first voltage and second voltage, and it is defeated
Go out to waveform signal generating unit and GOA unit；Finally, waveform signal generating unit receives first voltage and second voltage, delta frame starting
Signal and clock signal, and export to GOA unit.
So, when the running parameter of boosting unit meets pre-conditioned, boosting unit can be by analog voltage source
The first voltage and second that the analog voltage of input is converted to for being supplied to waveform signal generating unit and drive element of the grid is electric
Pressure.When the running parameter of boosting unit is unsatisfactory for pre-conditioned, in order to avoid the first voltage and second of boosting unit output
The amplitude of voltage decreases, and boosting unit can stop work of boosting, and causes to mend by sending enable signal to compensating unit
Repay unit and above-mentioned analog voltage is converted to into first voltage and second voltage, and export to waveform signal generating unit and raster data model electricity
Source, provides frame start signal and clock signal to drive element of the grid by the waveform signal generating unit, so that raster data model list
Unit the grid line in display floater can be carried out under first voltage, second voltage, the control of frame start signal clock signal by
Row scanning.The amplitude of first voltage and second voltage can be kept constant by the collective effect of boosting unit and compensating unit,
So as to the amplitude avoided in first voltage and second voltage reduces causing the voltage magnitude of drive element of the grid output to reduce, make
Obtain pixel cell charge rate to decline and the bad phenomenon of the display of generation.
As the power of boosting unit 20 is constant, there is formula W=UI to understand, while electric current I increases, boosting can be caused
The decline of 20 output voltage of unit (including first voltage VGH and second voltage VGL) amplitude.Therefore the prison in the embodiment of the present invention
Control unit 10 the electric current I of boosting unit 20 or output voltage U can be detected, when electric current I or output voltage U be unsatisfactory for it is pre-
If during condition, enabling to boosting unit 20 and stopping boosting work in time, and compensating unit 30 is opened, replace boosting unit
20 work, so that it is guaranteed that the amplitude of first voltage VGH and second voltage VGL is constant.Based on this, below step S102 is carried out in detail
Thin description.
For example, as the of the output of boosting unit 20 when the electric current of boosting unit 20 is more than or equal to 200mA, can be caused
The amplitude of one voltage VGH and second voltage VGL is substantially reduced.On this basis, above-mentioned monitoring unit 10 can be to boosting unit
10 electric current is monitored, when the electric current of boosting unit 10 is more than or equal to 220mA, can be to the input control letter of boosting unit 20
Number CS, so that boosting unit 20 stops boosting work.
Wherein, monitoring unit 10 can include current monitoring device, such as oscillograph, current monitoring monitor etc..
Again for example, in order to provide higher driving voltage, first voltage VGH and second voltage that boosting unit 20 is exported
The amplitude of VGL can be four times of analog voltage VCI amplitudes, therefore above-mentioned preset value can be the four of analog voltage VCI amplitudes
Times.On this basis, the output voltage of 10 pairs of boosting units 20 of monitoring unit (includes first voltage VGH and second voltage
VGL) it is monitored, it is when the amplitude of the output voltage of boosting unit 20 is less than four times of analog voltage VCI amplitudes, single to boosting
Unit 20 is input into control signal CS, so which stops boosting work.
Certainly, no matter boosting unit 20 is monitored by which kind of mode, after boosting unit 20 stops boosting work,
Enable signal EN will be sent to compensating unit 30, so as to compensating unit 30 replaces boosting unit 20 to continue boosting work, and will
First voltage VGH and second voltage VGL of output is exported to waveform signal generating unit 40 and GOA unit.
The above, the only specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by the scope of the claims.
Claims (10)
1. a kind of display driver circuit, including drive element of the grid, it is characterised in that also including boosting unit, compensating unit, ripple
Shape signal generating unit and monitoring unit；
The monitoring unit connects the boosting unit, for being monitored to the running parameter of the boosting unit, when described
When the running parameter of boosting unit is unsatisfactory for pre-conditioned, control signal is input into the boosting unit；
The boosting unit is also connected with analog voltage source, the waveform signal generating unit, the drive element of the grid and the benefit
Unit is repaid, for the analog voltage that the analog voltage source is input into is converted into first voltage and second voltage, and is exported to institute
State waveform signal generating unit and the drive element of the grid；Or, it is after the boosting unit receives the control signal, described
Boosting unit is used to stop boosting work, and enables signal to compensating unit input；
The compensating unit is also connected with the analog voltage source, the waveform signal generating unit and the drive element of the grid, uses
In after the enable signal is received, the analog voltage that the analog voltage source is input into is converted into into the first voltage and institute
Second voltage is stated, and is exported to the waveform signal generating unit and the drive element of the grid；
The waveform signal generating unit is also connected with the drive element of the grid, for receiving the first voltage and described second electric
Pressure, generates frame start signal and clock signal, and exports to the drive element of the grid.
2. display driver circuit according to claim 1, it is characterised in that the compensating unit includes that DC-to-dc becomes
Parallel operation.
3. display driver circuit according to claim 2, it is characterised in that the compensating unit also include the first electric capacity and
Second electric capacity；
One end of first electric capacity is connected with the compensating unit, other end ground connection；It is defeated for storing the compensating unit
The first voltage for going out；
One end of second electric capacity is connected with the compensating unit, other end ground connection；It is defeated for storing the compensating unit
The second voltage for going out.
4. display driver circuit according to claim 1, it is characterised in that the monitoring unit is for single to the boosting
The electric current of unit is monitored；The monitoring unit includes current monitoring device.
5. display driver circuit according to claim 1, it is characterised in that the monitoring unit is for single to the boosting
The output voltage of unit is monitored；The monitoring unit includes voltage monitoring device.
6. the display driver circuit according to any one of claim 1-5, it is characterised in that the first voltage or described
The amplitude of two voltages is four times of the analog voltage amplitude.
7. a kind of display device, it is characterised in that include the display driver circuit as described in any one of claim 1-6.
8. a kind of method for driving claim 1-6 any one display driver circuit, it is characterised in that include：
The analog voltage for receiving is converted into first voltage and second voltage by boosting unit, and export to waveform signal generating unit and
Drive element of the grid；
Monitoring unit is monitored to the running parameter of the boosting unit, when the running parameter of the boosting unit be unsatisfactory for it is pre-
If during condition, being input into control signal to the boosting unit；
The boosting unit receives the control signal, stops boosting work, and enables signal to compensating unit input；
The compensating unit receives the enable signal, and the analog voltage is converted into the first voltage and described second
Voltage, and export to waveform signal generating unit and drive element of the grid；
The waveform signal generating unit receives the first voltage and the second voltage, generates frame start signal and clock letter
Number, and export to drive element of the grid.
9. the driving method of display driver circuit according to claim 8, it is characterised in that the monitoring unit is to described
The running parameter of boosting unit is monitored, when the running parameter of the boosting unit is unsatisfactory for pre-conditioned, to the liter
Pressure unit input control signal includes：
The monitoring unit is monitored to the electric current of the boosting unit, when the electric current of the boosting unit is more than or equal to
During 220mA, the control signal is input into the boosting unit.
10. the driving method of display driver circuit according to claim 8, it is characterised in that the monitoring unit is to institute
The running parameter for stating boosting unit is monitored, when the running parameter of the boosting unit is unsatisfactory for pre-conditioned, to described
Boosting unit input control signal includes：
The monitoring unit is monitored to the output voltage of the boosting unit, when the width of the output voltage of the boosting unit
When value is less than four times of the analog voltage amplitude, the control signal is input into the boosting unit.
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| CN201510355549.7A CN104882111B (en) | 2015-06-24 | 2015-06-24 | A kind of display driver circuit and its driving method, display device |
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| CN201510355549.7A CN104882111B (en) | 2015-06-24 | 2015-06-24 | A kind of display driver circuit and its driving method, display device |
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| CN106875886B (en) * | 2017-03-02 | 2019-11-12 | 京东方科技集团股份有限公司 | Initial signal generative circuit, driving method and display device |
| CN109616076B (en) * | 2019-02-02 | 2021-08-06 | 合肥京东方光电科技有限公司 | Display device and working method thereof |
| CN112805776B (en) * | 2019-07-22 | 2022-10-25 | 京东方科技集团股份有限公司 | Panel driving device and method and display device |
| CN110767195B (en) * | 2019-11-20 | 2022-07-01 | 京东方科技集团股份有限公司 | Display device and driving method thereof |
| CN113436563B (en) * | 2021-06-03 | 2022-05-13 | 荣耀终端有限公司 | Power supply circuit, driving device and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102426820A (en) * | 2010-08-20 | 2012-04-25 | 三星移动显示器株式会社 | Method and apparatus for supplying power for display apparatus |
| CN103700358A (en) * | 2013-12-31 | 2014-04-02 | 合肥京东方光电科技有限公司 | GIP (Gate In Panel) type LCD (Liquid Crystal Display) device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000321550A (en) * | 1999-05-13 | 2000-11-24 | Kyocera Corp | Liquid crystal display device |
| US8289312B2 (en) * | 2007-05-11 | 2012-10-16 | Sharp Kabushiki Kaisha | Liquid crystal display device |
| KR101952936B1 (en) * | 2012-05-23 | 2019-02-28 | 삼성디스플레이 주식회사 | Display device and driving method thereof |
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2015
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102426820A (en) * | 2010-08-20 | 2012-04-25 | 三星移动显示器株式会社 | Method and apparatus for supplying power for display apparatus |
| CN103700358A (en) * | 2013-12-31 | 2014-04-02 | 合肥京东方光电科技有限公司 | GIP (Gate In Panel) type LCD (Liquid Crystal Display) device |
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