CN102024438B - Liquid crystal display source electrode driving device and driving method thereof - Google Patents
Liquid crystal display source electrode driving device and driving method thereof Download PDFInfo
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- CN102024438B CN102024438B CN201010606787A CN201010606787A CN102024438B CN 102024438 B CN102024438 B CN 102024438B CN 201010606787 A CN201010606787 A CN 201010606787A CN 201010606787 A CN201010606787 A CN 201010606787A CN 102024438 B CN102024438 B CN 102024438B
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Abstract
The embodiment of the invention discloses a liquid crystal display source electrode driving device and a driving method thereof, relating to the field of a liquid crystal display. In the invention, the optimal charging rate and the optimized power can be chosen to effectively solve the problem of brightness difference and avoid the phenomenon of dim line. The liquid crystal display source electrode driving device comprises an output buffer unit, an assistant bias current unit and an assistant bias current control unit, wherein the assistant bias current control unit controls the assistant bias current unit to provide dynamic assistant bias current for the output buffer unit. The invention can be applied to the liquid crystal display.
Description
Technical field
The present invention relates to field of liquid crystal, relate in particular to a kind of LCD source electrode driving device and driving method.
Background technology
In the course of work of LCD liquid crystal panel; Because in the sub-pixel unit; Have stray capacitance stray capacitances such as (Cgd), the output buffers unit of source electrode driver must also will charge to this part stray capacitance in to liquid crystal capacitance and MM CAP charging; Therefore, the inversion mode of counter-rotating (DOT Line) has bigger power consumption.
At present; Usually adopt the inversion mode of 2 row (2Line) or 1+2 capable (1+2Line), save power consumption, but when saving power consumption; Because the output buffers unit is different to the identical required electric weight of two row of polarity in 2Line or the 1+2Line inversion mode; Promptly second when charging row to stray capacitance charge required electric weight during less than the first row charging to the stray capacitance required electric weight that charges, have charge rate and the difference of charging degree of saturation between continuous two row, cause polarity identical two row liquid crystal speed reversals and angle inconsistent; Cause this two row brightness elementary errors, concealed wire (Dim Line) phenomenon occurs.Along with the appearance of the source electrode driver of 10bit and 12bit ash exponent number, it is more careful that GTG is divided, and the aanalogvoltage precision of source electrode driver output required higher, and this concealed wire (Dim Line) phenomenon is more prone to occur.
Prior art provides a source driving device, and is as shown in Figure 1, through an assisted bias current unit 2 is set; An assisted bias electric current I add is provided; Bias current Ibias with 1 output of output buffers unit realizes the driving of source electrode jointly, to improve driving force.But; To 2 row or 1+2 is capable etc. that multirow point inversion mode odd-numbered line and the driver capacity requirement between the even number line down is also inconsistent, so, raising driving force merely just; Can cause unnecessary power wastage; Simultaneously, also can't solve bright poor problem, can't eliminate concealed wire (Dim Line) phenomenon.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of LCD source electrode driving device and driving method; Can select optimal charge speed and optimization power consumption; Efficiently solve the problem of luminance difference, avoided concealed wire (Dim Line) phenomenon that causes thus.
For solving the problems of the technologies described above, LCD source electrode driving device of the present invention and driving method adopt following technical scheme:
A kind of LCD source electrode driving device; Comprise: output buffer cell and assisted bias current unit also comprise: control said assisted bias current unit selects to provide assisted bias current control unit from dynamic assisted bias electric current to said output buffer cell.
Said LCD is that two row counter-rotatings or are when adding two row inversion modes; Said assisted bias current control unit is controlled said assisted bias current unit when first row of two row counter-rotatings; The size of the assisted bias electric current that provides for said output buffer cell is A; Said assisted bias current control unit is controlled said assisted bias current unit when second row of two row counter-rotatings, and the size of the assisted bias electric current that provides for said output buffer cell is B, and A＞B.
Said assisted bias current control unit comprises:
The assisted bias current control module is used under the control of assisted bias current controling signal, controlling the dynamic assisted bias electric current that said assisted bias current unit is exported size variation.
Said assisted bias current control unit also comprises:
The proportional control module is used to control the amplitude of the level of said assisted bias current controling signal output.
Said assisted bias current control module comprises: by the first transistor and the transistor seconds of said assisted bias current controling signal control conducting; Said the first transistor and transistor seconds are connected to the positive-negative power of said assisted bias current unit and supply with end; The positive-negative power that is used to control said assisted bias current unit is supplied with the input of end, thereby controls the size of the assisted bias electric current of said assisted bias current unit output.
Said assisted bias current controling signal is produced by time schedule controller, is two frequencys multiplication of grid line sweep signal CPV or the two divided-frequency of polarity inversion signal POL.
A kind of LCD source driving method comprises:
In the moment that two row counter-rotating different rows are opened, select to provide dynamic assisted bias electric current to said output buffer cell.
Said LCD is two row counter-rotatings or when adding two every trade inversion modes, then in the moment that two row counter-rotating different rows are opened, selects to provide dynamic assisted bias electric current to comprise to said output buffer cell:
When first row of two row counter-rotatings, the size of the assisted bias electric current that provides for said output buffer cell is A;
When second row of two row counter-rotatings, the size of the assisted bias electric current that provides for said output buffer cell is B, wherein, and A＞B.
In technical scheme of the present invention; Through the assisted bias current control unit is set; Can select the optimal charge speed and the optimization power consumption of first row and second row according to debug results, in the speed that improves the rising of data output voltage or descend, satisfy the demands of different of different rows power consumption; Efficiently solve the problem of luminance difference, avoided concealed wire (Dim Line) phenomenon that causes thus.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of prior art LCD source electrode driving device;
Fig. 2 is the structural representation one of embodiment of the invention LCD source electrode driving device;
Fig. 3 is the structural representation of embodiment of the invention assisted bias current control unit;
Fig. 4 is the structural representation two of embodiment of the invention LCD source electrode driving device;
Fig. 5 is that the signal of embodiment of the invention proportional control module produces synoptic diagram;
Fig. 6 is the driving sequential design sketch one of the embodiment of the invention;
Fig. 7 is the driving sequential design sketch two of the embodiment of the invention;
Fig. 8 is an embodiment of the invention LCD source driving method process flow diagram;
Fig. 9 is the method flow diagram of step 101 among Fig. 8 of the present invention.
Description of reference numerals:
1-exports buffer cell; 2-assisted bias current unit;
3-assisted bias current control unit; 31-assisted bias current control module;
32-proportional control module; The 311-the first transistor; The 312-transistor seconds.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The embodiment of the invention provides a kind of LCD source electrode driving device and driving method, can select optimal charge speed and optimization power consumption, efficiently solves the problem of luminance difference, has avoided concealed wire (Dim Line) phenomenon that causes thus.
Embodiment one
As shown in Figure 2; The embodiment of the invention provides a kind of LCD source electrode driving device to comprise: output buffer cell 1 and assisted bias current unit 2 also comprise: control said assisted bias current unit 2 selects to provide assisted bias current control unit 3 from dynamic assisted bias electric current I add to said output buffer cell 1.
Wherein, Said LCD is 2 row or the capable inversion modes of 2+1; Then when second row of two row counter-rotatings; The said assisted bias current unit 2 of then said assisted bias current control unit 3 controls is when first row of two row counter-rotatings, and the assisted bias electric current I add size that provides for output buffer cell 1 is A, and the said assisted bias current unit 2 of said assisted bias current control unit 3 controls is when second row of two row counter-rotatings; The assisted bias electric current I add size that provides for output buffer cell 1 is B, and A＞B.
Further, as shown in Figure 3, this assisted bias current control unit 3 comprises: assisted bias current control module 31 and proportional control module 32.
Assisted bias current control module 31 is used under the control of said assisted bias current controling signal, controlling the dynamic assisted bias electric current that said assisted bias current unit is exported size variation; Proportional control module 32 is used to control the amplitude of the level of said assisted bias current controling signal output.
As shown in Figure 4; Said assisted bias current control module 31 comprises: by the first transistor 311 and transistor seconds 312 of assisted bias current controling signal BCS control conducting; Said the first transistor 311 is supplied with end (Vin-and Vin+) with the positive-negative power that transistor seconds 312 is connected to the assisted bias current unit, is used to control the input of the positive-negative power supply end (Vin-and Vin+ end) of said assisted bias current unit.Add the BCS signal to the power supply of Vin+ and Vin-and supply with end; Height control of Electric potentials Vin+ that can be through the BCS signal and two transistor turns at Vin-place whether and the conducting degree, thereby control the assisted bias size of current that the assisted bias current unit is exported.
Further; As shown in Figure 5, the realization of proportional control module (Scale Selector) can be the effect through level translator (Level Shift), the level value of BCS signal is raised or dragged down be BCS1; Further; By the conducting degree of BCS1 control the first transistor and transistor seconds, thereby the current supply size of control assisted bias current unit power source supply end realizes the ratio of Iadd is selected.
Further, the realization of proportional control module (Scale Selector) can also use number of digital to select signal DX1, and DX2, DXn, outer meeting resistance draw high the number percent that the form that drags down is controlled Iadd size of current and power consumption.
Below through a concrete embodiment technical scheme of the present invention is described, as shown in Figure 6, wherein, CPV is the controlling grid scan line signal; POL is a polarity inversion signal; BCS is the assisted bias current controling signal, and BCS1 is the assisted bias current controling signal of output after the adjustment of proportional control module; Data is a data scanning line signal; Vcom is the public electrode wire signal, and wherein, the BCS signal is produced by time schedule controller, is two frequencys multiplication of CPV signal, the two divided-frequency of POL signal.
Like Fig. 4 and shown in Figure 6, particularly, first row of output buffer cell 1 (Source IC Buffer) driving liquid crystal device 2Line counter-rotating; At this moment, owing to when liquid crystal capacitance charged, need the stray capacitance charge capacity of counter plate bigger; Need bigger driving force; So, need open the transistor that the power source supply end of assisted bias current unit 2 adds, start assisted bias current unit 2.Therefore; At this moment, BCS and BCS1 signal are high level, and the first transistor 311 of the power supply supply of BCS1 control assisted bias current unit 2 is opened with transistor seconds 312; Assisted bias current unit 2 provides Iadd to output buffer cell 1, thereby can improve the speed that data voltage rises.
Second row in output buffer cell 1 driving liquid crystal device 2Line counter-rotating; This moment, the stray capacitance charge capacity of counter plate needed less when liquid crystal capacitance was charged, and needed less driving force; Therefore, need restriction perhaps not launch the assisted bias current unit.At this moment; BCS and BCS1 signal are low level; The first transistor 311 and transistor seconds 312 transistors of BCS1 signal controlling assisted bias current control module 31 are closed; Thereby closed the power supply supply of the power source supply end of assisted bias current unit 2, assisted bias current unit 2 no longer provides Iadd to output buffer cell 1, thereby delays the speed that data voltage rises.
In the technical scheme of present embodiment; Liquid crystal inversion mode to 2Line or 1+2Line; It is faster than the speed that does not increase the assisted bias current unit to reach the first row liquid crystal charge rate; And the second row liquid crystal charge rate is slowed down, thereby reaches the purpose of saving unnecessary power consumption loss and balance same polarity two row luminance deviations.
Among the embodiment shown in Figure 6, in conjunction with shown in Figure 4, the level magnitude of BCS1 equates with the level magnitude of BCS; Proportional control module 32 is not drawn high the level of BCS signal or drag down; And in the embodiment shown in fig. 7, proportional control module 32 is drawn high the level of BCS signal and is BCS1, drags down to be BCS2; Thereby further control the conducting degree of the first transistor 311 and transistor seconds 312, thereby realize the adjusting as required of the charge rate of second row.
Need to prove that the effect of BCS signal is the charging ability of the output buffer cell of Controlling Source electrode driving device, every row changes once.As the case may be, during second row, 70%, 80% or 85% of the Iadd that the assisted bias current unit was exported when the size of the Iadd of assisted bias current unit output can be chosen as first row.Concrete numerical value can be decided by the actual debug results of panel, and should not limit, and needs the interlacing alternation, rather than constant.
In technical scheme of the present invention; Through the assisted bias current control unit is set; Can select the optimal charge speed and the optimization power consumption of first row and second row according to debug results, in the speed that improves the rising of data output voltage or descend, satisfy the demands of different of different rows power consumption; Efficiently solve the problem of luminance difference, avoided concealed wire (Dim Line) phenomenon that causes thus.
The present invention also provides a kind of source driving method of using above-mentioned LCD source electrode driving device, and is as shown in Figure 8, and this method comprises:
Step 101, in the moment that two row counter-rotating different rows are opened, select to provide dynamic assisted bias electric current to the output buffer cell.
Further, said LCD is 2 row or the capable inversion modes of 2+1, and as shown in Figure 9, then step 101 comprises:
Step 1011, when first row of two row counter-rotatings, the size of the assisted bias electric current that provides for said output buffer cell is A;
The size of step 1012, the assisted bias electric current that provides for said output buffer cell is B, wherein, and A＞B.
In technical scheme of the present invention; Can select the optimal charge speed and the optimization power consumption of first row and second row according to debug results; In the speed that improves the rising of data output voltage or descend; Satisfied the demands of different of different rows, efficiently solved the problem of luminance difference, avoided concealed wire (Dim Line) phenomenon that causes thus power consumption.
Through the description of above embodiment, the those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential common hardware, can certainly pass through hardware, but the former is better embodiment under a lot of situation.Based on such understanding; The part that technical scheme of the present invention contributes to prior art in essence in other words can be come out with the embodied of software product, and this computer software product is stored in the storage medium that can read, like the floppy disk of computing machine; Hard disk or CD etc.; Comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, 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 said claim.
Claims (4)
1. LCD source electrode driving device; Comprise: output buffer cell and assisted bias current unit; It is characterized in that, also comprise: control said assisted bias current unit selects to provide assisted bias current control unit from dynamic assisted bias electric current to said output buffer cell;
Said LCD is that two row counter-rotatings or are when adding two row inversion modes; Said assisted bias current control unit is controlled said assisted bias current unit when first row of two row counter-rotatings; The size of the assisted bias electric current that provides for said output buffer cell is A; Said assisted bias current control unit is controlled said assisted bias current unit when second row of two row counter-rotatings, and the size of the assisted bias electric current that provides for said output buffer cell is B; Wherein, said assisted bias electric current B interlacing alternation, and A＞B;
Said assisted bias current control unit comprises:
The assisted bias current control module is used under the control of assisted bias current controling signal, controlling the dynamic assisted bias electric current that said assisted bias current unit is exported size variation;
The proportional control module is used to control the amplitude of the level of said assisted bias current controling signal output.
2. source electrode driving device according to claim 1; It is characterized in that; Said assisted bias current control module comprises: by the first transistor and the transistor seconds of said assisted bias current controling signal control conducting; Said the first transistor and transistor seconds are connected to the positive-negative power of said assisted bias current unit and supply with end; The positive-negative power that is used to control said assisted bias current unit is supplied with the input of end, thereby controls the size of the assisted bias electric current of said assisted bias current unit output.
3. source electrode driving device according to claim 2 is characterized in that, said assisted bias current controling signal is produced by time schedule controller, is two frequencys multiplication of two divided-frequency or the polarity inversion signal POL of grid line sweep signal CPV.
4. a LCD source driving method is characterized in that, comprising:
In the moment that two row counter-rotating different rows are opened, select to provide dynamic assisted bias electric current to the output buffer cell;
Said LCD is two row counter-rotatings or when adding two row inversion modes, then in the moment that two row counter-rotating different rows are opened, selects to provide dynamic assisted bias electric current to comprise to said output buffer cell:
When first row of two row counter-rotatings, the size of the assisted bias electric current that provides for said output buffer cell is A;
When second row of two row counter-rotatings, the size of the assisted bias electric current that provides for said output buffer cell is B, wherein, and said assisted bias electric current B interlacing alternation, A＞B.
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| TWI557716B (en) * | 2015-07-22 | 2016-11-11 | 友達光電股份有限公司 | Display and driving method thereof |
| CN106558293B (en) * | 2016-12-30 | 2019-05-17 | 北京集创北方科技股份有限公司 | Display system and its driving method, device |
| CN107134248B (en) * | 2017-07-04 | 2020-11-06 | 京东方科技集团股份有限公司 | Source electrode driving circuit, voltage control method of output signal of source electrode driving circuit and display device |
| CN109243397B (en) | 2018-11-12 | 2021-03-19 | 惠科股份有限公司 | Display control device and display apparatus |
| CN109285517A (en) | 2018-11-12 | 2019-01-29 | 惠科股份有限公司 | Display control unit and display panel |
| CN113593492B (en) * | 2021-07-15 | 2022-10-04 | Tcl华星光电技术有限公司 | Driving system and driving method of display panel |
| US11823637B2 (en) | 2021-12-29 | 2023-11-21 | Novatek Microelectronics Corp. | Timing control circuit and operation method thereof |
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