CN103165059A - Drive method, drive module, and display device of displayer - Google Patents
Drive method, drive module, and display device of displayer Download PDFInfo
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- CN103165059A CN103165059A CN2011104081729A CN201110408172A CN103165059A CN 103165059 A CN103165059 A CN 103165059A CN 2011104081729 A CN2011104081729 A CN 2011104081729A CN 201110408172 A CN201110408172 A CN 201110408172A CN 103165059 A CN103165059 A CN 103165059A
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Abstract
A drive method of a displayer comprises the following steps of deciding a first target accurate position voltage and a second target accurate position voltage of scanning signals, deciding a first switching time and a second switching time according to resistance and capacitance loads of scanning lines, deciding at least a first pre-charging accurate position voltage and at least a second pre-charging accurate position voltage according to the first target accurate position voltage, the second target accurate position voltage, the first switching time, and the second switching time, and outputting the first pre-charging accurate position voltage, the first target accurate position voltage, the second pre-charging accurate position voltage, and the second target accurate position voltage to drive a display panel, wherein the first pre-charging accurate position voltage is switched to the first target accurate position voltage after the first switching time, and the second pre-charging accurate position voltage is switched to the second target accurate position voltage after the second switching time.
Description
[technical field]
The present invention is about a kind of display drive method, driver module and display device, especially in regard to display drive method, driver module and the display device of a kind of active matrix (active matrix).
[background technology]
The advantages such as flat display apparatus (flat display apparatus) is low with its power consumption, thermal value is few, lightweight and non-radiation type, be used in electronic product miscellaneous, and little by little replace traditional cathode-ray tube (CRT) (cathode ray tube, CRT) display device.
Flat display apparatus generally can be divided into two kinds of passive matrix type (passive matrix) and active matrixes (active matrix) etc. according to its type of drive.Yet the passive matrix type display device is subject to drive pattern, therefore have the life-span shorter with can't large tracts of land etc. shortcoming.And the shortcoming such as although active matrix display device cost is more expensive and processing procedure is more complicated, the true color that is applicable to large scale, high-resolution high information capacity shows, therefore, has become the main flow of flat display apparatus.
Please refer to shown in Figure 1A, it is a kind of schematic diagram of existing active matrix display device 1.
Wherein, sweep trace S
mThe ON time (being sweep time) of the sweep signal of output is mainly by sweep trace S
mQuantity and display frequency decide.Yet, please refer to shown in Figure 1B, due to the stray capacitance of display panel 11 picture element arrays, be for example data line D
nThe stray capacitance (Cgd for example of cross-line (cross over), switching transistor, Cgs, and the loaded impedance of picture element may cause a desirable sweep signal waveform A (solid line part) to postpone and distortion forms another waveform B (dotted portion) Csd etc.).The problem that the phenomenon of this kind signal delay and distortion especially causes when the display device of large scale, high resolving power and solid (3D) may be more serious, for example may cause the missampling (sampling error) of picture element and display panel 11 can't normally be shown.
Therefore, how to provide a kind of display drive method, driver module and display device, can improve the signal delay of sweep trace, and have the effect that reduces power attenuation and reduce picture element switch module stress effect, become one of important topic.
[summary of the invention]
Because above-mentioned problem, purpose of the present invention is for providing a kind of signal delay of improving sweep trace, and has display drive method, driver module and the display device that reduces power attenuation and reduce picture element switch module stress effect.
For reaching above-mentioned purpose, foundation a kind of display drive method of the present invention is by at least one scanning line driving one display panel.Display drive method comprises the following steps: determine one of scanning-line signal first object level voltage and one second target level voltage; According to the resistance capacitance load of sweep trace, to determine one first switching time and one second switching time; According to determining first object level voltage, the second target level voltage, the first switching time and the second switching time at least one the first preliminary filling level voltage and at least one the second preliminary filling level voltage; And export the first preliminary filling level voltage, first object level voltage, the second preliminary filling level voltage and the second target level voltage drives display panel, wherein the first preliminary filling level voltage switches to first object level voltage after the first switching time, and the second preliminary filling level voltage switches to the second target level voltage after the second switching time.
In one embodiment, first object level voltage and the second target level voltage decide according to the gray scale voltage of display panel picture data, and the first object level is at least than the high critical voltage of high gray voltage, and the second target level is at least than the low critical voltage of minimum gray scale voltage.
In one embodiment, the first preliminary filling level voltage is higher than first object level voltage, and the second preliminary filling level voltage is lower than the second target level voltage.
In one embodiment, produce the time constant of sweep trace according to the resistance capacitance load of sweep trace, to determine the first switching time and the second switching time.
In one embodiment, when a time point, one of them of output the first preliminary filling level voltage, first object level voltage, the second preliminary filling level voltage and the second target level voltage.
For reaching above-mentioned purpose, foundation a kind of driver module of the present invention is by at least one scanning line driving one display panel.Driver module comprises scan driving circuit, a testing circuit and one scan signal generating circuit.Scan drive circuit output one scan drive display panel, scanning drive signal has at least one the first preliminary filling level voltage and a first object level voltage, and the first preliminary filling level voltage switches to first object level voltage after one first switching time.Testing circuit measures the resistance capacitance load of sweep trace, to determine for the first switching time.Generation circuit of scanning signals is electrically connected with scan drive circuit and testing circuit, and gated sweep driving circuit output scanning driving signal, and generation circuit of scanning signals is according to determining first object level voltage and the first switching time the first preliminary filling level voltage.
In one embodiment, first object level voltage decides according to the gray scale voltage of display panel picture data, and the first object level is at least than the high critical voltage of high gray voltage.
In one embodiment, testing circuit produces the time constant of sweep trace according to the resistance capacitance load of sweep trace, to select for the first switching time.
In one embodiment, scanning drive signal has more at least one the second preliminary filling level voltage and one second target level voltage, and the second preliminary filling level voltage switches to the second target level voltage after one second switching time.
In one embodiment, generation circuit of scanning signals is according to the second target level voltage and determine the second preliminary filling level voltage the second switching time.
In one embodiment, the second target level is at least than the low critical voltage of the gray scale voltage of minimum level, and high gray voltage is the highest data voltage in a display frame, and minimum gray scale voltage is data voltage minimum in display frame.
In one embodiment, the first preliminary filling level voltage is higher than first object level voltage, and the second preliminary filling level voltage is lower than the second target level voltage.
For reaching above-mentioned purpose, comprise a display panel and a driver module according to a kind of display device of the present invention.Driver module is by at least one scanning line driving display panel, and driver module has scan driving circuit, a testing circuit and one scan signal generating circuit.Scan drive circuit output one scan drive display panel, scanning drive signal has at least one the first preliminary filling level voltage and a first object level voltage, and the first preliminary filling level voltage switches to first object level voltage after one first switching time.Testing circuit measures the resistance capacitance load of sweep trace, to determine for the first switching time.Generation circuit of scanning signals and scan drive circuit and testing circuit are electrically connected, and gated sweep driving circuit output scanning driving signal, and generation circuit of scanning signals is according to determining first object level voltage and the first switching time the first preliminary filling level voltage.
In one embodiment, first object level voltage decides according to the gray scale voltage that drives the display panel picture data, and the first object level is at least than the high critical voltage of gray scale voltage of high levle.
In one embodiment, testing circuit produces the time constant of sweep trace according to the resistance capacitance load of sweep trace, to select for the first switching time.
In one embodiment, scanning drive signal has more at least one the second preliminary filling level voltage and one second target level voltage, and the second preliminary filling level voltage switches to the second target level voltage after one second switching time.
In one embodiment, generation circuit of scanning signals is according to the second target level voltage and determine the second preliminary filling level voltage the second switching time.
In one embodiment, the second target level is at least than the low critical voltage of minimum gray scale voltage, and high gray voltage is the highest data voltage in a display frame, and minimum gray scale voltage is data voltage minimum in display frame.
In one embodiment, scan drive circuit is exported one of them of the first preliminary filling level voltage, first object level voltage, the second preliminary filling level voltage and the second target level voltage when putting sometime.
In one embodiment, the first preliminary filling level voltage is higher than first object level voltage, and the second preliminary filling level voltage is lower than the second target level voltage.
From the above, display drive method of the present invention, driver module and display device are according to the resistance capacitance load of sweep trace, to determine one first switching time and one second switching time.In addition, according to determining first object level voltage, the second target level voltage, the first switching time and the second switching time one first preliminary filling level voltage and one second preliminary filling level voltage.In addition, export the first preliminary filling level voltage, first object level voltage, the second preliminary filling level voltage and the second target level voltage to drive display panel, wherein, the first preliminary filling level voltage switches to first object level voltage after the first switching time, the second preliminary filling level voltage switches to the second target level voltage after the second switching time.By this, can make sweep signal reach rapidly target level voltage, therefore, but the load charge-discharge time of accelerated scan line, to improve the signal delay of sweep trace.In addition, need not use fixing and high-tension scanning drive signal to drive the picture element of display panel, therefore, can reduce the power attenuation of display device and the stress effect of minimizing picture element switching transistor yet.
[description of drawings]
Figure 1A is a kind of schematic diagram of existing active matrix display device;
Figure 1B is the waveform schematic diagram of one scan signal;
Fig. 2 is the function block schematic diagram of a kind of display device of preferred embodiment of the present invention;
Fig. 3 is the driving signal schematic representation of the display panel of Fig. 2;
Fig. 4 A is the circuit diagram that the testing circuit of Fig. 2 measures the resistance capacitance load of one scan line;
Fig. 4 B is the waveform schematic diagram of a test signal;
Fig. 4 C is the charging curve schematic diagram of resistance capacitance;
Fig. 5 A is the function block schematic diagram of scan drive circuit and generation circuit of scanning signals;
Fig. 5 B is the partial circuit schematic diagram of Fig. 5 A; And
Fig. 6 is the schematic flow sheet of display drive method of the present invention.
[primary clustering symbol description]
1,4: display device
11,3: display panel
12: driver module
121,122,21: scan drive circuit
2: driver module
211: voltage position quasi displacement circuit
212: shift scratch circuit
213: output buffer
22: testing circuit
23: generation circuit of scanning signals
24: data drive circuit
A, B: waveform
C: electric capacity
DD: data drive signal
D
n: data line
P1: the first preliminary filling level voltage
P2: the second preliminary filling level voltage
R: resistance
S01 to S04: step
SD: scanning drive signal
S
m: sweep trace
T1: the first switching time
T2: the second switching time
T1: first object level voltage
T2: the second target level voltage
Ts: test signal
Ts1, ts2, Th, St: time
V
f, V
i, V (ts1), V (ts2): voltage
W1～W4: switch
τ: time constant
[embodiment]
Hereinafter with reference to correlative type, a kind of display drive method, driver module and display device according to preferred embodiment of the present invention are described, wherein identical assembly will be illustrated with identical reference marks.
Below, first describe display device 4 of the present invention and driver module 2 in detail, after, then display drive method of the present invention is described.
Please refer to Fig. 2 and shown in Figure 3, wherein, Fig. 2 is the function block schematic diagram of a kind of display device 4 of preferred embodiment of the present invention, and Fig. 3 is the driving signal schematic representation of the display panel 3 of Fig. 2.
Scanning drive signal SD can have at least one the first preliminary filling level voltage P1 and a first object level voltage T1, and the first preliminary filling level voltage P1 is higher than first object level voltage T1, and the first preliminary filling level voltage P1 can switch to through one first switching time first object level voltage T1 after t1.In addition, scanning drive signal SD more can have at least one the second preliminary filling level voltage P2 and one second target level voltage T2, the second preliminary filling level voltage P2 is lower than the second target level voltage T2, and the second preliminary filling level voltage P2 switches to the second target level voltage T2 after t2 through one second switching time.Wherein, first object level voltage T1 can be the high levle voltage of scanning drive signal SD, and the second target level voltage T2 can be the low level voltage of scanning drive signal SD.In the present embodiment, as shown in Figure 3, scanning drive signal SD is take one first preliminary filling level voltage P1 and one second preliminary filling level voltage P2 as example.But, in other embodiments, scanning drive signal SD also can have more than one the first preliminary filling level voltage P1 and the second preliminary filling level voltage P2.
Below, will describe in detail how to determine the first preliminary filling level voltage P1, the second preliminary filling level voltage P2, first object level voltage T1, the second target level voltage T2, first switching time t1 and second switching time t2.
First object level voltage T1 and the second target level voltage T2 decide according to the gray scale voltage that drives display panel 3 picture elements.In other words, the gray scale voltage value according to the data drive signal DD that drives display panel 3 decides first object level voltage T1 and the second target level voltage T2.Wherein, first object level voltage T1 can be at least than the high critical voltage of gray scale voltage (threshold voltage) of high levle, and the second target level voltage T2 can be at least than the low critical voltage of gray scale voltage of minimum level.And the gray scale voltage of high levle is the highest data voltage in a display frame, and the gray scale voltage of minimum level is data voltage minimum in a display frame.
In details of the words, first object level voltage T1 and the second target level voltage T2 are variable, and its voltage can decide according to the data drive signal DD of correspondence every delegation picture element, also can according to a certain regional picture element or all the gray scale voltage of picture elements decide.for example, suppose in a time point, drive the first row of certain delegation's picture element, secondary series, the 3rd row to the high and minimum gray scale voltage of the data drive signal DD of n row be 5V and-3V, the first object level voltage T1 of scanning drive signal SD that drives the sweep trace of this row picture element can select higher than at least one of maximum gray voltage (the highest data voltage) more than critical voltage value, and the second target level voltage T2 can select lower than at least one of minimum gray voltage (minimum data voltage) more than critical voltage value, for example first object level voltage T1 can select 7V, and the second target level voltage T2 can select-5V.The user can select different first object level voltage T1 and the second target level voltage T2 according to its design requirement.In addition, because the maximum gray voltage of the data drive signal DD of the picture element that drives the different scanning line may be identical or not identical, therefore, the first object level voltage T1 of the scanning drive signal SD of different scanning line and the second target level voltage T2 also may be identical or not identical.Drive the picture element of display panel 3 due to the scanning drive signal SD that need not use fixing and high voltage, therefore, can reduce the power attenuation of display device 4 and the stress effect (stress effect) of minimizing picture element switching transistor.
Then, please refer to shown in Fig. 4 A, it is the circuit diagram that testing circuit 22 measures the resistance capacitance load (RC loading) of one scan line.
Can be considered the combination of an equivalent resistance R and an equivalent capacitor C due to the circuit of sweep trace, in addition, the load (picture element of display panel 3) that each sweep trace in display device 4 connects is all identical, therefore testing circuit 22 can measure the load of the resistance capacitance of arbitrary sweep trace.Wherein, testing circuit 22 can produce at least one test signal Ts input one scan line, sweep trace is carried out the measurement of timeconstantτ.As shown in Figure 4 B, test signal Ts for example can be a square wave, and its high levle voltage is V
f(for example 20V), low level voltage are V
i(for example 0V).
In other words, for determine first switching time t1 and second switching time t2, testing circuit 22 is when at least one time, for example the time ts1 of Fig. 4 B or time ts2 send a test signal Ts to sweep trace.When test signal Ts input scan line, can look to get a voltage V (ts1) voltage difference of two ends (capacitor C) up and down in one of capacitor C when time ts1, and measure a voltage V (ts2) during time ts2.
Please refer to shown in Fig. 4 C, it is the charging curve schematic diagram of resistance capacitance.Wherein, the longitudinal axis of Fig. 4 C is the RC charge percentage, and the right side of transverse axis is time (microsecond, μ s), and the left side of transverse axis is the multiple of RC.In addition, the solid line on the left of Fig. 4 C represents a desirable RC charging curve, and its equation can be V (t)=V
i+ Δ V (1-e
(t/ τ)), Δ V=V
f-V
i=20V, τ=RC, and the dotted line on Fig. 4 C right side is different RC load curve 1 and 2.
For example, the RC load of supposing sweep trace is the dotted line-resistance capacitance load 1 on Fig. 4 C right side, in test signal Ts input scan line, and measure that the capacitor C both end voltage is poor is V (ts1) when times 10 microsecond (μ s), according to formula: Δ V (ts1)=(V (ts1)-V
i)/(V
f-V
i) be converted into charge percentage, then to correspond to desirable RC charging curve be 63.2%, it is 1 RC time that transverse axis can obtain the time, therefore can obtain the timeconstantτ of sweep trace=1RC=10 μ s.
Again for another example, the RC load of supposing sweep trace is another dotted line-resistance capacitance load 2 (the RC load of expression sweep trace is routine different with upper) on Fig. 4 C right side, in test signal Ts input scan line, and the both end voltage that measures capacitor C when times 10 microsecond (μ s) is poor is V (ts1), be converted into charge percentage according to formula, corresponding to desirable RC charging curve is 77.7% again, and transverse axis can obtain the RC time of 1.5 times.Therefore, 1.5RC=10 μ s is therefore can obtain the timeconstantτ of sweep trace=1RC=10 μ s/1.5=6.67 μ s.By that analogy.
After obtaining the timeconstantτ of sweep trace, first switching time t1 and second switching time t2 can be the multiple of timeconstantτ.And the selection of multiple can be adjusted according to the size of display panel 3, the user can according to the speed demand in its duration of charging selected different first switching time t1 and second switching time t2.In this, do not limited.
Referring again to shown in Figure 2, generation circuit of scanning signals 23 is electrically connected with scan drive circuit 21 and testing circuit 22.Generation circuit of scanning signals 23 can be controlled scan drive circuit 21 output scannings and drive signal SD.Wherein, generation circuit of scanning signals 23 according to first object level voltage T1 and first switching time t1 determine the first preliminary filling level voltage P1, and according to the second target level voltage T2 and second switching time t2 determine the second preliminary filling level voltage P2.First switching time t1 with second switching time t2 can select identically, also can select not identical.In this, with first switching time t1 with second switching time t2 be all mutually example.
Referring again to shown in Figure 3, in the present embodiment, the level of scanning drive signal SD is sequentially the first preliminary filling level voltage P1, first object level voltage T1, the second preliminary filling level voltage P2 and the second target level voltage T2, to drive display panel 3.In addition, when a time point, one of them of scan drive circuit 21 output the first preliminary filling level voltage P1, first object level voltage T1, the second preliminary filling level voltage P2 and the second target level voltage T2.
Wherein, generation circuit of scanning signals 23 is according to first object level voltage T1, the second target level voltage T2 and the first t1 switching time (and second switching time t2), and decides the first preliminary filling level voltage P1 and the second preliminary filling level voltage P2 according to a look-up table (look up table).Wherein, look-up table can in be built in generation circuit of scanning signals 23.
When selecting first object level voltage T1 and the second target level voltage T2, can select according to panel size and demand thereof the multiple of timeconstantτ, then decide the value of the first preliminary filling level voltage P1 and the second preliminary filling level voltage P2.For example, for example shown in following table one, if according to gray scale voltage select first object level voltage T1 and the second target level voltage T2 be respectively 15V and-during 5V, when selecting again the timeconstantτ of 2 times of this sweep traces, just can determine that the first preliminary filling level voltage P1 and the second preliminary filling level voltage P are respectively 18.13V and reach-8.13V.What specify is, as the larger person of multiple of the timeconstantτ of selecting, the value of the first preliminary filling level voltage P1 will be higher, and the value of the second preliminary filling level voltage P will be lower.Therefore, the user can according to its design requirement select suitable first object level voltage T1, the second target level voltage T2, first switching time t1 and second switching time t2, then select the first preliminary filling level voltage P1 and the second preliminary filling level voltage P2 according to look-up table.
Table one
In addition, please refer to shown in Fig. 5 A and Fig. 5 B, wherein, Fig. 5 A is the function block schematic diagram of scan drive circuit 21 and generation circuit of scanning signals 23, and Fig. 5 B is the partial circuit schematic diagram of Fig. 5 A.
As shown in Fig. 5 A, scan drive circuit 21 can have a voltage position quasi displacement circuit 211, a shift scratch circuit 212 and an output buffer 213.Wherein, voltage position quasi displacement circuit 211 is electrically connected with shift scratch circuit 212 and generation circuit of scanning signals 23.Voltage position quasi displacement circuit 211 can be with the logic level of the low voltage of for example 3V/0V or 5V/0V, is passed to drive the required higher cut-in voltage of picture element switch and the low following voltage of closing.Moreover shift scratch circuit 212 is electrically connected with output buffer 213 and generation circuit of scanning signals 23.But the signal of shift scratch circuit 212 receiver voltage position quasi displacement circuit 211 outputs, and control its actuation time according to the control signal that for example sequential control circuit (figure does not show) is exported, and export output buffer 213 to.
In addition, exportable the first preliminary filling level voltage P1 of generation circuit of scanning signals 23, first object level voltage T1, the second preliminary filling level voltage P2 and the second target level voltage T2, first switching time t1 and second switching time t2 to scan drive circuit 21.In addition, for key diagram 5B, in this, output buffer 213 is take the two-stage phase inverter simplified as example, and real circuit and progression can be according to the actual design of display panel 3, in this not explanation in detail.It is worth mentioning that, above-mentioned generation circuit of scanning signals 23 and testing circuit 22 can be integrated in sequential control circuit (timing control circuit), also can integrate with scan drive circuit 21, are not limited in this.
Please refer to shown in Fig. 5 B, generation circuit of scanning signals 23 can be exported respectively the first preliminary filling level voltage P1, first object level voltage T1, the second preliminary filling level voltage P2 and the second target level voltage T2 to output buffer 213 in different time, so that the scanning drive signal SD of scan drive circuit 21 outputs has different levels in different time points, to drive display panel 3.
Please be simultaneously with reference to shown in Fig. 3 and Fig. 5 B, in Qi Shishi, generation circuit of scanning signals 23 controllable switch W1 conductings, with with the first preliminary filling level voltage P1 input and output buffer circuit 213, make scanning drive signal SD have the first preliminary filling level voltage P1 (the first preliminary filling level voltage P1 is higher than first object level voltage T1); Through the first switching time during t1, generation circuit of scanning signals 23 controllable switch W2 conductings (not conducting of gauge tap W1 simultaneously), with with first object level voltage T1 input and output buffer circuit 213, make scanning drive signal SD switch to first object level voltage T1 by the first preliminary filling level voltage P1; Again through a time Th (sweep time St deduct first switching time t1) after, generation circuit of scanning signals 23 controllable switch W3 conductings (not conducting of gauge tap W2 simultaneously), with with the second preliminary filling level voltage P2 input and output buffer circuit 213, make scanning drive signal SD switch to the second preliminary filling level voltage P2 (the second preliminary filling level voltage P2 is lower than the second target level voltage T2) by first object level voltage T1; Again after the second switching time t2, generation circuit of scanning signals 23 controllable switch W4 conductings (not conducting of gauge tap W3 simultaneously), with with the second target level voltage T2 input and output buffer circuit 213, make scanning drive signal SD switch to the second target level voltage T2 by the second preliminary filling level voltage P2.By that analogy, can make described sweep trace S
mThe scanning drive signal SD that output is corresponding is to drive respectively display panel 3.
Hold, because sweep trace of the present invention passes through the first higher preliminary filling level voltage P1 preliminary filling, and switch to first object level voltage T1 after t1 through the first switching time, close by the second lower preliminary filling level voltage P2 again, and switch to the second target level voltage T2 after t2 through the second switching time.By this, can make sweep signal reach rapidly target level voltage, therefore, but accelerated scan line S
mThe load charge-discharge time, to improve sweep trace S
mSignal delay.In addition, need not use fixing and high-tension scanning drive signal SD to drive the picture element of display panel 3, therefore, can reduce the power attenuation of display device 4 and the stress effect (stress effect) of minimizing picture element switching transistor yet.
In addition, please refer to Fig. 6 and relevant indicators, so that display drive method of the present invention to be described.Wherein, Fig. 6 is the schematic flow sheet of display drive method of the present invention.
Display drive method of the present invention is by at least one scanning line driving one display panel 3.As shown in Figure 2, in this, with multi-strip scanning line S
mDrive display panel 3.Wherein, display drive method comprises that step S01 is to step S04.
Step S01 is: determine one of scanning-line signal first object level voltage T1 and one second target level voltage T2.In this, first object level voltage T1 and the second target level voltage T2 decide according to the gray scale voltage that drives display panel 3 picture elements.
Step S02 is: according to the resistance capacitance load of sweep trace, with determine one first switching time t1 and one second switching time t2.
As shown in Fig. 4 A to Fig. 4 C, in this, produce a test signal Ts input one scan line, sweep trace is carried out the measurement of timeconstantτ.In addition, can produce according to the resistance capacitance load of sweep trace the timeconstantτ of sweep trace, and according to timeconstantτ decide first switching time t1 and second switching time t2.Wherein, first switching time t1 with second switching time t2 can be identical, can be not identical yet.In this, to be all mutually example.
Step S03 is: according to first object level voltage T1, the second target level voltage T2, first switching time t1 and second switching time t2 determine at least one the first preliminary filling level voltage P1 and at least one the second preliminary filling level voltage P2.
As shown in Figure 3, in this, take first a preliminary filling level voltage P1 and second a preliminary filling level voltage P2 as example.In addition, select the first preliminary filling level voltage P1 and the second preliminary filling level voltage P2 according to a look-up table (routine table one described above).Wherein, the first preliminary filling level voltage P1 is higher than first object level voltage T1, and the second preliminary filling level voltage P2 is lower than the second target level voltage T2.
Step S04 is: output the first preliminary filling level voltage P1, first object level voltage T1, the second preliminary filling level voltage P2 and the second target level voltage T2 are to drive display panel.Wherein, the first preliminary filling level voltage P1 switches to first object level voltage T1 after t1 through the first switching time, and the second preliminary filling level voltage P2 switches to the second target level voltage T2 after t2 through the second switching time.
As shown in Figure 3, in this, the level of the scanning drive signal SD of scan drive circuit 21 outputs can be sequentially the first preliminary filling level voltage P1, first object level voltage T1, the second preliminary filling level voltage P2 and the second target level voltage T2, and when a time point, export one of them of the first preliminary filling level voltage P1, first object level voltage T1, the second preliminary filling level voltage P2 and the second target level voltage T2, to drive display panel 3.
In addition, the further feature of display drive method of the present invention in above-mentioned middle detailed description, repeats no more in this.
In sum, display drive method of the present invention, driver module and display device are according to the resistance capacitance load of sweep trace, to determine one first switching time and one second switching time.In addition, according to determining first object level voltage, the second target level voltage, the first switching time and the second switching time one first preliminary filling level voltage and one second preliminary filling level voltage.In addition, export the first preliminary filling level voltage, first object level voltage, the second preliminary filling level voltage and the second target level voltage to drive display panel, wherein, the first preliminary filling level voltage switches to first object level voltage after the first switching time, the second preliminary filling level voltage switches to the second target level voltage after the second switching time.By this, can make sweep signal reach rapidly target level voltage, therefore, but the load charge-discharge time of accelerated scan line, to improve the signal delay of sweep trace.In addition, need not use fixing and high-tension scanning drive signal to drive the picture element of display panel, therefore, can reduce the power attenuation of display device and the stress effect of minimizing picture element switching transistor yet.
The above is only illustrative, but not is restricted person.Anyly do not break away from spirit of the present invention and category, and to its equivalent modifications of carrying out or change, all should be contained in accompanying claim.
Claims (20)
1. display drive method, by at least one scanning line driving one display panel, this display drive method comprises the following steps:
Determine one of scanning-line signal first object level voltage and one second target level voltage;
According to the resistance capacitance load of this sweep trace, to determine one first switching time and one second switching time;
According to determining this first object level voltage, this second target level voltage, this first switching time and this second switching time at least one the first preliminary filling level voltage and at least one the second preliminary filling level voltage; And
Export this first preliminary filling level voltage, this first object level voltage, this second preliminary filling level voltage and this second target level voltage to drive this display panel, wherein this first preliminary filling level voltage switches to this first object level voltage after this first switching time, and this second preliminary filling level voltage switches to this second target level voltage after this second switching time.
2. display drive method according to claim 1, it is characterized in that, this first object level voltage and this second target level voltage decide according to the gray scale voltage of this display panel picture data, and this first object level is at least than the high critical voltage of high gray voltage, and this second target level is at least than the low critical voltage of minimum gray scale voltage.
3. display drive method according to claim 1, is characterized in that, this first preliminary filling level voltage is higher than this first object level voltage, and this second preliminary filling level voltage is lower than this second target level voltage.
4. display drive method according to claim 1, is characterized in that, produces the time constant of this sweep trace according to the resistance capacitance load of this sweep trace, to determine this first switching time and this second switching time.
5. display drive method according to claim 1, is characterized in that, when a time point, exports one of them of this first preliminary filling level voltage, this first object level voltage, this second preliminary filling level voltage and this second target level voltage.
6. driver module, by at least one scanning line driving one display panel, this driver module comprises:
Scan driving circuit, this display panel of output one scan drive, this scanning drive signal has at least one the first preliminary filling level voltage and a first object level voltage, and this first preliminary filling level voltage switches to this first object level voltage after one first switching time;
One testing circuit measures the resistance capacitance load of this sweep trace, to determine this first switching time; And
The one scan signal generating circuit, be electrically connected with this scan drive circuit and this testing circuit, and control this scan drive circuit and export this scanning drive signal, this generation circuit of scanning signals is according to this first object level voltage and determine this first preliminary filling level voltage this first switching time.
7. driver module according to claim 6, is characterized in that, this first object level voltage decides according to the gray scale voltage of this display panel picture data, and this first object level is at least than the high critical voltage of high gray voltage.
8. driver module according to claim 6, is characterized in that, this testing circuit produces the time constant of this sweep trace according to the resistance capacitance load of this sweep trace, to select this first switching time.
9. driver module according to claim 6, it is characterized in that, this scanning drive signal has more at least one the second preliminary filling level voltage and one second target level voltage, and this second preliminary filling level voltage switches to this second target level voltage after one second switching time.
10. driver module according to claim 9, is characterized in that, this generation circuit of scanning signals is according to this second target level voltage and determine this second preliminary filling level voltage this second switching time.
11. driver module according to claim 9, it is characterized in that, this the second target level is at least than the low critical voltage of minimum gray scale voltage, and this high gray voltage is the highest data voltage in a display frame, and this minimum gray scale voltage is data voltage minimum in this display frame.
12. driver module according to claim 9 is characterized in that, this first preliminary filling level voltage is higher than this first object level voltage, and this second preliminary filling level voltage is lower than this second target level voltage.
13. a display device comprises:
One display panel; And
One driver module, by this display panel of at least one scanning line driving, this driver module has:
Scan driving circuit, this display panel of output one scan drive, this scanning drive signal has at least one the first preliminary filling level voltage and a first object level voltage, and this first preliminary filling level voltage switches to this first object level voltage after one first switching time;
One testing circuit measures the resistance capacitance load of this sweep trace, to determine this first switching time; And
The one scan signal generating circuit, be electrically connected with this scan drive circuit and this testing circuit, and control this scan drive circuit and export this scanning drive signal, this generation circuit of scanning signals is according to this first object level voltage and determine this first preliminary filling level voltage this first switching time.
14. display device according to claim 13 is characterized in that, this first object level voltage decides according to the gray scale voltage that drives this display panel picture data, and this first object level is at least than the high critical voltage of high gray voltage.
15. display device according to claim 13 is characterized in that, this testing circuit produces the time constant of this sweep trace according to the resistance capacitance load of this sweep trace, to select this first switching time.
16. display device according to claim 13, it is characterized in that, this scanning drive signal has more at least one the second preliminary filling level voltage and one second target level voltage, and this second preliminary filling level voltage switches to this second target level voltage after one second switching time.
17. display device according to claim 16 is characterized in that, this generation circuit of scanning signals is according to this second target level voltage and determine this second preliminary filling level voltage this second switching time.
18. display device according to claim 16, it is characterized in that, this the second target level is at least than the low critical voltage of minimum gray scale voltage, and this high gray voltage is the highest data voltage in a display frame, and this minimum gray scale voltage is data voltage minimum in this display frame.
19. display device according to claim 16, it is characterized in that, this scan drive circuit is exported one of them of this first preliminary filling level voltage, this first object level voltage, this second preliminary filling level voltage and this second target level voltage when putting sometime.
20. display device according to claim 16 is characterized in that, this first preliminary filling level voltage is higher than this first object level voltage, and this second preliminary filling level voltage is lower than this second target level voltage.
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| CN201110408172.9A CN103165059B (en) | 2011-12-09 | 2011-12-09 | Display drive method, driver module and display device |
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| CN103165059B (en) | 2016-01-20 |
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Address after: 518100 Longhua, Shenzhen, town, Foxconn science and Technology Industrial Park E District, building 4, building 1, building Applicant after: Qunkang Technology (Shenzhen) Co., Ltd. Applicant after: Innolux Display Group Address before: 518100 Longhua, Shenzhen, town, Foxconn science and Technology Industrial Park E District, building 4, building 1, building Applicant before: Qunkang Technology (Shenzhen) Co., Ltd. Applicant before: Chimei Optoelectronics Co., Ltd. |
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