CN101593496B - Grid output control method - Google Patents
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- CN101593496B CN101593496B CN 200910139625 CN200910139625A CN101593496B CN 101593496 B CN101593496 B CN 101593496B CN 200910139625 CN200910139625 CN 200910139625 CN 200910139625 A CN200910139625 A CN 200910139625A CN 101593496 B CN101593496 B CN 101593496B
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Abstract
The invention discloses a grid output control method, which is suitable for a liquid crystal display comprising first and second grid driving integrated circuits. The method comprises the following steps: providing grid control signals; performing angle cut modulation on the grid control signals by angle cut control signals so as to obtain modulated grid control signals; and providing the modulated grid control signals for the first and second grid driving integrated circuits so as to orderly control the grid output of the first and second grid driving integrated circuits. A first work cycle used when the angle cut control signals modulate the grid control signals to generate the modulated grid control signals and provide the modulated grid control signals for the first grid driving integrated circuit is different from a second work cycle used when the angle cut control signals modulate the grid control signals to generate the modulated grid control signals and provide the modulated grid control signals for the second grid driving integrated circuit.
Description
Technical field
The present invention relates to the display technique field, and particularly relevant for a kind of grid output control method.
Background technology
LCD has high image quality, volume is little, in light weight and advantage such as applied range, therefore be widely used in consumption electronic products such as mobile phone, notebook computer, desktop display and TV, and replaced traditional cathode-ray tube display gradually and become the main flow of display.
Referring to Fig. 1, it illustrates the structured flowchart of a kind of LCD of the prior art.As shown in Figure 1, LCD 100 comprises display base plate 110, printed circuit board (PCB) 120 and a plurality of flexible circuit board 130.Display base plate 110 is provided with a plurality of grid-driving integrated circuit GD1 and GD2, a plurality of source electrode driven integrated circuit (not showing among Fig. 1) and shows block 111 and 112, grid-driving integrated circuit GD1 and GD2 control respectively show block 111 and 112 and by the array upper conductor (WOA Wire-On-Array) is one another in series and couples.Printed circuit board (PCB) 120 is by flexible circuit board 130 and display base plate 110 phase electric property couplings, and it is provided with time schedule controller 121 and grid pulse modulator 123.Time schedule controller 121 provides grid output enable signal YOE to grid-driving integrated circuit GD1 and GD2, and output grid control signal VGH and top rake control signal (Angling control signal) YV1C are to grid pulse modulator 123; Wherein, grid pulse modulator 123 is set to overcome film flicker (Flicker) phenomenon.
Please in the lump referring to Fig. 1 and Fig. 2, Fig. 2 illustrates the circuit block diagram of grid pulse modulator 123.As shown in Figure 2, grid pulse modulator 123 roughly comprises phase inverter (Inverter), level translator (LevelShifter) and transistor P1, N1, the conduction and cut-off state of top rake control signal YV1C control transistor P1, N1 after phase inverter and level translator processing is modulated grid control signal VGH is carried out top rake, and then produces the grid control signal VGG after the modulation.Afterwards, the grid control signal VGG after the modulation will transfer to grid-driving integrated circuit GD1 and GD2 in regular turn by flexible circuit board 130 and array upper conductor, with the grid output of control grid-driving integrated circuit GD1 and GD2.
Please in the lump referring to Fig. 1 and Fig. 3, Fig. 3 illustrates the sequential chart of the grid control signal VGG behind grid output enable signal YOE, the top rake control signal YV1C and modulation in the prior art.From Fig. 3, can learn, the part of the corresponding grid-driving integrated circuit GD1 of grid control signal VGG after top rake control signal YV1C and the modulation has identical waveform with another part of corresponding grid-driving integrated circuit GD2, and the top rake voltage of the grid control signal VGG after the modulation is always V1.Wherein, the high level period of top rake control signal YV1C is that T1, low-level period are T2, and correspondingly, the work period of top rake control signal YV1C is T1/T2.
Please in the lump referring to Fig. 1 and Fig. 4, because the impedance of array upper conductor is bigger, cause the grid control signal VGG after the modulation in the process that transfers to grid-driving integrated circuit GD1 and GD2, to change because of lead decay waveform, there is voltage drop Δ V0 in grid control signal VGG2 after the modulation of grid control signal VGG1 after the modulation of feasible arrival grid-driving integrated circuit GD1 and arrival grid-driving integrated circuit GD2, and then the brightness that causes showing block 111 and 112 difference and produce the light line of level of boundary to some extent, that is there is the defective of vertical plane brightness disproportionation.
Summary of the invention
One of purpose of the present invention just provides a kind of grid output control method, effectively to overcome the defective of LCD vertical plane brightness disproportionation in the prior art.
A kind of grid output control method that one embodiment of the invention proposes is applicable to LCD; LCD comprises first grid drive integrated circult and second grid drive integrated circult, and grid output control method comprises step: grid control signal is provided; Utilize the top rake control signal that grid control signal is carried out top rake modulation and grid control signal after must modulating; And provide grid control signal after the modulation to first grid drive integrated circult and second grid drive integrated circult, to control the grid output of first grid drive integrated circult and second grid drive integrated circult in regular turn.Wherein, the top rake control signal in the modulation grid control signal and the grid control signal after producing modulation employed first work period is different from the top rake control signal in the modulation grid control signal when providing to the first grid drive integrated circult employed second work period when providing to the second grid drive integrated circult of the grid control signal after producing modulation.
In one embodiment of this invention, the path-length that transfers to the first grid drive integrated circult when the grid control signal after the modulation is when transferring to the path-length of second grid drive integrated circult, and first work period is greater than second work period.
In one embodiment of this invention, first low-level period and second low-level period of first work period of above-mentioned top rake control signal and second work period difference correspondence are different.Further, the path-length that transfers to the first grid drive integrated circult when the grid control signal after the modulation is when transferring to the path-length of second grid drive integrated circult, and first low-level period is less than second low-level period.
In one embodiment of this invention, above-mentioned first grid drive integrated circult and second grid drive integrated circult are one another in series and couple.
In another embodiment of the present invention, above-mentioned first grid drive integrated circult and second grid drive integrated circult are connected in parallel to each other and couple.
A kind of grid output control method that yet another embodiment of the invention proposes is applicable to LCD; LCD comprises first grid drive integrated circult and second grid drive integrated circult, and grid output control method comprises: grid control signal is provided; Utilize the top rake control signal that grid control signal is carried out top rake and modulate the grid control signal after must modulating so that the grid control signal top rake is extremely preset top rake voltage; And provide grid control signal after the modulation to first grid drive integrated circult and second grid drive integrated circult, to control the grid output of first grid drive integrated circult and second grid drive integrated circult in regular turn.Wherein, be different from default top rake voltage in order to the grid control signal after the modulation of the grid output of controlling the second grid drive integrated circult in order to the default top rake voltage of the grid control signal after the modulation of the grid output of controlling the first grid drive integrated circult.
In one embodiment of this invention, the path-length that transfers to the first grid drive integrated circult when the grid control signal after the modulation is higher than default top rake voltage in order to the grid control signal after the modulation of the grid output of controlling the second grid drive integrated circult in order to the default top rake voltage of the grid control signal after the modulation of the grid output of controlling the first grid drive integrated circult when transferring to the path-length of second grid drive integrated circult.
In one embodiment of this invention, above-mentioned default top rake voltage changes with the change of the work period of top rake control signal.Further, the path-length that transfers to the first grid drive integrated circult when the grid control signal after the modulation when transferring to the path-length of second grid drive integrated circult, the top rake control signal in the modulation grid control signal and the grid control signal after producing modulation during with the grid output of control first grid drive integrated circult employed first work period greater than the top rake control signal in the modulation grid control signal and employed second work period during with the grid output of control second grid drive integrated circult of the grid control signal after producing modulation.
In another embodiment of the present invention, above-mentioned default top rake voltage changes with the change of the low-level period of top rake control signal.Further, the path-length that transfers to the first grid drive integrated circult when the grid control signal after the modulation when transferring to the path-length of second grid drive integrated circult, the top rake control signal in the modulation grid control signal and the grid control signal after producing modulation during with the grid output of control first grid drive integrated circult employed first low-level period less than the top rake control signal in the modulation grid control signal and employed second low-level period during with the grid output of control second grid drive integrated circult of the grid control signal after producing modulation.
A kind of grid output control method that further embodiment of this invention proposes is applicable to LCD; LCD comprises a plurality of grid-driving integrated circuits, and grid output control method comprises step: grid control signal is provided; Provide a plurality of top rake control signals that grid control signal is carried out top rake modulation and produce grid control signal after a plurality of modulation with different top rake voltages in regular turn in asynchronous mode; And the grid control signal after providing these to modulate is to these grid-driving integrated circuits, to control the grid output of these grid-driving integrated circuits respectively.Wherein, these top rake control signals have different low-level period.
In one embodiment of this invention, above-mentioned top rake control signal has identical transmission path.
In one embodiment of this invention, above-mentioned grid-driving integrated circuit is one another in series and couples or coupled in parallel.
The embodiment of the invention is by work period or the low-level period of modulation top rake control signal, make the grid control signal after the modulation that is used for the different grid-driving integrated circuits of control have different top rake magnitudes of voltage, with the lead decay of the grid control signal after the compensation modulation in transferring to the process of each grid-driving integrated circuit, and then there is not the voltage drop between the grid control signal after the modulation of feasible each grid-driving integrated circuit of arrival; Therefore can effectively overcome the defective of the vertical plane brightness disproportionation that exists in the prior art.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and cooperate appended accompanying drawing, be described in detail below.
Description of drawings
Fig. 1 illustrates a structured flowchart of a kind of LCD of the prior art;
Fig. 2 illustrates a circuit block diagram of a grid pulse modulator of LCD shown in Figure 1;
Fig. 3 illustrates the grid output enable signal, top rake control signal of LCD shown in Figure 1 and the sequential chart of the grid control signal after the modulation;
Fig. 4 illustrates the waveform comparison diagram of the grid control signal after the modulation of each grid-driving integrated circuit that arrives LCD shown in Figure 1;
Fig. 5 illustrates the sequential chart of the grid control signal after grid output enable signal, top rake control signal and the modulation that is relevant to the embodiment of the invention;
Fig. 6 illustrates the waveform comparison diagram of the grid control signal after the modulation of each grid-driving integrated circuit of arrival that is relevant to the embodiment of the invention;
Fig. 7 illustrates a structured flowchart of a kind of LCD that is relevant to the embodiment of the invention.
Wherein, Reference numeral
100: LCD
110: display base plate
111,112: show block
120: printed circuit board (PCB)
121: time schedule controller
123: grid pulse modulator
130: flexible circuit board
GD1, GD2: grid-driving integrated circuit
VGH: grid control signal
YOE: grid output enable signal
YV1C: top rake control signal
VGG: the grid control signal after the modulation
VGG1, VGG2: the grid control signal after the modulation of arrival grid-driving integrated circuit
P1, N1: transistor
T1: the high level period of top rake control signal YV1C
T2: the low-level period of top rake control signal YV1C
V1: the top rake voltage of the grid control signal VGG after the modulation
Δ V0: voltage drop
YV1C ': top rake control signal
VGG ': the grid control signal after the modulation
T1 ': the high level period of top rake control signal YV1C '
T2 ': the low-level period of top rake control signal YV1C '
V2: the top rake voltage of the grid control signal VGG ' after the modulation
Δ V: voltage drop
Embodiment
Specifically describe a kind of grid output control method that one embodiment of the invention proposes below in conjunction with Fig. 1, Fig. 5 and Fig. 6.The grid output control method of present embodiment is applicable to the grid-driving integrated circuit GD1 that comprises coupled in series shown in Figure 1 and the LCD 100 of GD2, and the structure configuration of LCD 100 can be referring to above, so it no longer is described in detail in detail.
Please in the lump referring to Fig. 1 and Fig. 5, Fig. 5 illustrates the grid output enable signal YOE, the top rake control signal YV1C that are relevant to present embodiment and the sequential chart of the grid control signal VGG after the modulation.Comparison diagram 5 and Fig. 2 are as can be known, on the one hand, the grid control signal VGG that top rake control signal YV1C produces at modulation grid control signal VGH (referring to Fig. 1) after the modulation remains former setting value T1/T2 when providing to grid-driving integrated circuit GD1 the employed work period, correspondingly, the high level period of top rake control signal YV1C is that T1, low-level period are T2, and the top rake voltage of the grid control signal VGG after the modulation is V1.On the other hand, top rake control signal YV1C (for convenience of description, hereinafter will be with YV1C ' replacement) at modulation grid control signal VGH and the grid control signal VGG after producing modulation (for convenience of description, hereinafter with VGG ' replacement) the employed work period be set to T1 '/T2 ' when providing to grid-driving integrated circuit GD2, correspondingly, the high level period of top rake control signal YV1C ' is that T1 ', low-level period are T2 ', and the top rake voltage of the grid control signal VGG ' after the modulation is V2.At this, top rake control signal YV1C has identical transmission path with top rake control signal YV1C ' but provides in asynchronous mode, T1+T2=T1 '+T2 ', and top rake voltage V1 and top rake voltage V2 are different.
Hold above-mentioned, the relative size relation of work period T1/T2 and T1 '/T2 ' and the relative size relation of top rake voltage V1 and V2 with modulate after grid control signal VGG (VGG ') to transfer to the path-length of grid-driving integrated circuit GD1, GD2 relevant.In the present embodiment, grid control signal VGG (VGG ') after the modulation transfers to the path-length of grid-driving integrated circuit GD1 less than the path-length that transfers to grid-driving integrated circuit GD2, therefore work period T1/T2 is greater than T1 '/T2 ', correspondingly, the low-level period of YV1C be T2 less than the low-level period of YV1C ' is T2 '; And top rake voltage V1 is higher than top rake voltage V2.
Can learn also that from Fig. 5 top rake voltage changes with the change of the work period of top rake control signal; Particularly, be tuned as T1 '/T2 ' when the work period of top rake control signal YV1C (YV1C ') by T1/T2, then top rake voltage correspondingly changes to V2 by V1.Further, the top rake voltage of present embodiment also changes with the change of the low-level period of top rake control signal, and particularly, when the low-level period of top rake control signal YV1C (YV1C ') is tuned as T2 ' by T2, then top rake voltage correspondingly is changed to V2 by V1.Therefore, work period or low-level period by modulation top rake control signal, can realize top rake voltage V1-V2=Δ V0 easily, with the lead decay of the grid control signal VGG (VGG ') after the compensation modulation in the process that transfers to grid-driving integrated circuit GD1 and GD2, and then make grid control signal VGG1 and VGG2 after the modulation that arrives grid-driving integrated circuit GD1 and GD2 not have the voltage drop, that is Δ V=0 as shown in Figure 6.
In addition, the grid-driving integrated circuit GD1 of the above embodiment of the present invention and GD2 are not limited to be one another in series and join, and it also can pass through the array upper conductor as shown in Figure 7 and be connected in parallel to each other and join.
Need to prove, the grid output control method that the embodiment of the invention proposes is not limited to be applicable to the LCD that comprises two grid-driving integrated circuits, it is equally applicable to comprise the LCD of more (for example three and more than) grid-driving integrated circuit, and the work period by suitable modulation top rake control signal or low-level period can realize arriving the purpose that does not have the voltage drop between the grid control signal after the modulation of each grid-driving integrated circuit.
In sum, the embodiment of the invention is by work period or the low-level period of modulation top rake control signal, make the grid control signal after the modulation that is used for the different grid-driving integrated circuits of control have different top rake magnitudes of voltage, with the lead decay of the grid control signal after the compensation modulation in transferring to the process of each grid-driving integrated circuit, and then there is not the voltage drop between the grid control signal after the modulation of feasible each grid-driving integrated circuit of arrival; Therefore can effectively overcome the defective of the vertical plane brightness disproportionation that exists in the prior art.
In addition, those skilled in the art also can do suitable change to the grid output control method that the above embodiment of the present invention proposes, and for example change top rake control signal YV1C and YV1C ' for having different transmission paths, setting value of work period T1/T2 and T1 '/T2 ' etc. according to the needs of practical application.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (18)
1. a grid output control method is applicable to a LCD, and this LCD comprises a first grid drive integrated circult and a second grid drive integrated circult, it is characterized in that this grid output control method comprises step:
One grid control signal is provided;
Utilize a top rake control signal that this grid control signal is carried out top rake modulation and the grid control signal after the modulation; And
Provide grid control signal after this modulation to this first grid drive integrated circult and this second grid drive integrated circult, to control the grid output of this first grid drive integrated circult and this second grid drive integrated circult in regular turn;
Wherein, this top rake control signal at this grid control signal of modulation and grid control signal after producing this modulation employed one first work period be different from when providing to this first grid drive integrated circult this top rake control signal modulating this grid control signal employed one second work period when providing to this second grid drive integrated circult of the grid control signal after producing this modulation, the ratio of the low-level period of this first work period, high level period that this second work period is corresponding top rake control signal and this top rake control signal.
2. grid output control method according to claim 1, it is characterized in that, the path-length that transfers to this first grid drive integrated circult when the grid control signal after this modulation is when transferring to the path-length of this second grid drive integrated circult, and this first work period is greater than this second work period.
3. grid output control method according to claim 1 is characterized in that, one first low-level period and one second low-level period of this first work period of this top rake control signal and this second work period difference correspondence are different.
4. grid output control method according to claim 3, it is characterized in that, the path-length that transfers to this first grid drive integrated circult when the grid control signal after this modulation is when transferring to the path-length of this second grid drive integrated circult, and this first low-level period is less than this second low-level period.
5. grid output control method according to claim 1 is characterized in that, this first grid drive integrated circult and this second grid drive integrated circult are one another in series and couple.
6. grid output control method according to claim 1 is characterized in that, this first grid drive integrated circult and this second grid drive integrated circult are connected in parallel to each other and couple.
7. a grid output control method is applicable to a LCD, and this LCD comprises a first grid drive integrated circult and a second grid drive integrated circult, it is characterized in that this grid output control method comprises step:
One grid control signal is provided;
Utilize a top rake control signal to this grid control signal carry out top rake modulation with the default top rake voltage of this grid control signal top rake to one and the grid control signal after the modulation; And
Provide grid control signal after this modulation to this first grid drive integrated circult and this second grid drive integrated circult, to control the grid output of this first grid drive integrated circult and this second grid drive integrated circult in regular turn;
Wherein, preset top rake voltage in order to should default top rake voltage being different from order to being somebody's turn to do of grid control signal after this modulation of the grid output of controlling this second grid drive integrated circult of the grid control signal after this modulation of the grid output of controlling this first grid drive integrated circult;
Wherein, this top rake control signal at this grid control signal of modulation and grid control signal after producing this modulation employed one first work period be different from when providing to this first grid drive integrated circult this top rake control signal modulating this grid control signal employed one second work period when providing to this second grid drive integrated circult of the grid control signal after producing this modulation, the ratio of the low-level period of this first work period, high level period that this second work period is corresponding top rake control signal and this top rake control signal.
8. grid output control method according to claim 7, it is characterized in that, the path-length that transfers to this first grid drive integrated circult when the grid control signal after this modulation is when transferring to the path-length of this second grid drive integrated circult, in order to should default top rake voltage being higher than in order to being somebody's turn to do of grid control signal after this modulation of the grid output of controlling this second grid drive integrated circult of the grid control signal after this modulation of the grid output of controlling this first grid drive integrated circult to preset top rake voltage.
9. grid output control method according to claim 7 is characterized in that, this default top rake voltage changes with the change of the work period of this top rake control signal.
10. grid output control method according to claim 9, it is characterized in that, the path-length that transfers to this first grid drive integrated circult when the grid control signal after this modulation when transferring to the path-length of this second grid drive integrated circult, this top rake control signal at this grid control signal of modulation and the grid control signal after producing this modulation when controlling the grid output of this first grid drive integrated circult employed one first should the work period greater than this top rake control signal at this grid control signal of modulation and the grid control signal after producing this modulation employed one second should the work period when exporting with the grid of controlling this second grid drive integrated circult.
11. grid output control method according to claim 7 is characterized in that, this default top rake voltage changes with the change of the low-level period of this top rake control signal.
12. grid output control method according to claim 11, it is characterized in that, the path-length that transfers to this first grid drive integrated circult when the grid control signal after this modulation when transferring to the path-length of this second grid drive integrated circult, this top rake control signal at this grid control signal of modulation and the grid control signal after producing this modulation when controlling the grid output of this first grid drive integrated circult employed one first this low-level period less than this top rake control signal at this grid control signal of modulation and employed one second this low-level period when exporting with the grid of controlling this second grid drive integrated circult of the grid control signal after producing this modulation.
13. grid output control method according to claim 7 is characterized in that, this first grid drive integrated circult and this second grid drive integrated circult are one another in series and couple.
14. grid output control method according to claim 7 is characterized in that, this first grid drive integrated circult and this second grid drive integrated circult are connected in parallel to each other and couple.
15. a grid output control method is applicable to a LCD, this LCD comprises a plurality of grid-driving integrated circuits, it is characterized in that, this grid output control method comprises step:
One grid control signal is provided;
Provide a plurality of top rake control signals that this grid control signal is carried out top rake modulation and produce grid control signal after a plurality of modulation with different top rake voltages in regular turn in asynchronous mode; And
Provide grid control signal after the described modulation to described grid-driving integrated circuit, to control the grid output of described grid-driving integrated circuit respectively;
Wherein, described top rake control signal has different low-level period,
Wherein, the top rake control signal at this grid control signal of modulation and grid control signal after producing this modulation employed one first work period be different from when providing to the first grid drive integrated circult this top rake control signal modulating this grid control signal employed one second work period when providing to the second grid drive integrated circult of the grid control signal after producing this modulation, the ratio of the low-level period of this first work period, high level period that this second work period is corresponding top rake control signal and this top rake control signal.
16. grid output control method according to claim 15 is characterized in that, described top rake control signal has identical transmission path.
17. grid output control method according to claim 15 is characterized in that, described grid-driving integrated circuit is one another in series and couples.
18. grid output control method according to claim 15 is characterized in that, described grid-driving integrated circuit is connected in parallel to each other and couples.
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| US9013385B2 (en) | 2012-09-29 | 2015-04-21 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Driving circuit of LCD panel, LCD panel, and LCD device |
| CN102855862B (en) * | 2012-09-29 | 2014-07-30 | 深圳市华星光电技术有限公司 | Driving circuit of liquid crystal panel, liquid crystal panel and liquid crystal display device |
| CN103413534B (en) * | 2013-07-31 | 2015-11-25 | 南京中电熊猫液晶显示科技有限公司 | The driving method of liquid crystal display and signal thereof |
| CN104575410B (en) * | 2013-10-18 | 2018-12-28 | 联咏科技股份有限公司 | Electricity saving method and its related liquid crystal display |
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| CN108831404B (en) * | 2018-09-11 | 2020-08-11 | 惠科股份有限公司 | Display panel, driving method thereof and display device |
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