CN101826311A - LCD device capable of prolonging charging time and related driving method thereof - Google Patents
LCD device capable of prolonging charging time and related driving method thereof Download PDFInfo
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- CN101826311A CN101826311A CN200910118910A CN200910118910A CN101826311A CN 101826311 A CN101826311 A CN 101826311A CN 200910118910 A CN200910118910 A CN 200910118910A CN 200910118910 A CN200910118910 A CN 200910118910A CN 101826311 A CN101826311 A CN 101826311A
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Abstract
The invention relates to an LCD device which comprises a plurality of first data lines, a plurality of second data lines, a plurality of gate lines, a plurality of display units, a source electrode driver and a grid electrode driver, wherein each second data line is arranged between the two corresponding first data lines, and each display unit is coupled and connected between the corresponding first data line and the corresponding gate line or between the corresponding second data line and the corresponding gate line; the source electrode driver is coupled and connected with the first data lines and the second data line, and is used for providing a plurality of groups of data signals; and each group of data signals are output into the corresponding first data line from a first period of the write period, and then are output into the corresponding second data line from a second period of the write period. The invention relates to the LCD device capable of prolonging the charging time and a related driving method thereof.
Description
Technical field
The present invention is relevant to a kind of liquid crystal indicator and associated drives mode, refers to the liquid crystal indicator and the associated drives mode in a kind of duration of charging of extending especially.
Background technology
Because LCD (liquid crystal display, LCD) have low radiation, volume is little and advantage such as low power consuming, replace traditional cathode-ray tube (CRT) (cathode raytube gradually, CRT) display, and be widely used in mobile computer, personal digital assistant (personal digital assistant, PDA), flat-surface television, or on the information products such as mobile phone.
Along with the panel size of LCD constantly becomes big, the also corresponding increase of the load of panel, dynamic power consumption also can significantly promote, the important topic when how to reduce power consumption and also becoming the design LCD.Generally speaking, the polarity of voltage that is applied to the liquid crystal capacitance two ends must reverse every a schedule time, cause nonvolatil destruction to avoid liquid crystal material to produce polarization (polarization), the mode of common driving display panels comprises a counter-rotating (dot inversion), line counter-rotating (line inversion) and picture frame counter-rotating (frame inversion) etc.When the polarity of voltage that drives display panels began counter-rotating, source electrode driver need provide lot of energy changing data line voltage, so the time also be the time of LCD load maximum.Simultaneously, along with the raising of operating frequency and panel resolution, the liquid crystal capacitance duration of charging also shortens, if front and back two driving voltages are widely different, may can't reach desirable voltage quasi position because of the duration of charging is not enough when reversal of poles.Therefore, generally can use precharge (precharge) to improve the problem of duration of charging deficiency.
Please refer to Fig. 1, Fig. 1 is the synoptic diagram of a LCD 10 in the background technology.LCD 10 comprises a display panels 12, one source pole driver (source driver) 14, and two gate drivers (gate driver) 16 and 18.Display panels 12 is provided with data line parallel to each other (data line) DL
1～DL
m, gate line (gate line) GL parallel to each other
1～GL
nAnd a plurality of pixel P (1,1)～P (m, n).Data line DL
1～DL
mWith gate lines G L
1～GL
nSetting interlaced with each other, and display unit P (1,1)～P (m n) then is located at the confluce of corresponding data line and gate line respectively.Each display unit on the display panels 12 all includes a thin film transistor (TFT) (thin film transistor, TFT) switch and a liquid crystal capacitance, and each liquid crystal capacitance sees through a corresponding TFT switch and is coupled to a corresponding data line.Source electrode driver 14 can produce and be relevant to the data-signal of desiring show image, and gate drivers 16 and 18 can produce opens the required signal of TFT switch.When the TFT of display unit switch is opened by signal, the liquid crystal capacitance of this display unit can be electrically connected to its corresponding data line to receive the data-signal that transmits from source electrode driver 14, therefore display unit can be controlled the rotation degree of liquid crystal molecule according to the electric charge (its polarity is represented by "+" or " _ ") of its liquid crystal capacitance internal memory, to show the image of different GTGs.
Please refer to Fig. 2, Fig. 2 is the sequential chart of prior art LCD 10 when running.In Fig. 2, transverse axis is represented the time, longitudinal axis representative voltage position standard.CK_O, CKB-_O and STV_O represent required frequency signal and the start signal of gate drivers 16 runnings, and CK_E, CKB-_E and STV_E represent required frequency signal and the start signal of gate drivers 18 runnings.GS1～GS4 represents respectively and exports gate lines G L to
1～GL
4Signal.The DATA designate data signal, and DATA1～DATA4 represents the data-signal that exports same data line to respectively.T represents the operating cycle of LCD 10, and A1～A4 representative charges normal the cycle, and P1～P4 represents precharge cycle.When input data signal DATA1, signal GS1 and GS2 are all noble potential, and pixel P this moment (1,1) is in the cycle of charging normal, and pixel P (1,2) is at precharge cycle.That is, when precharge cycle P2, utilize the data-signal DATA1 that writes pixel P (1,1) to carry out precharge earlier to pixel P (1,2), write real data-signal DATA2 again at the ensuing cycle A2 that charges normal.
LCD 10 can use precharge to increase duration of charging (being increased to T/2 by T/4) of TFT switch, but when if front and back two data-signal differences are excessive, and can't reach good precharge effect.Simultaneously, the display quality of LCD is best with a counter-rotating, but LCD 10 can only reach line counter-rotating or picture frame counter-rotating, and can't reach a counter-rotating.
Summary of the invention
The invention provides the liquid crystal indicator in a kind of duration of charging of extending, it comprises first data line that the m bar be arranged in parallel; Second data line that the m bar be arranged in parallel, each second data line are located between two corresponding first data lines, and are parallel to this corresponding first data line; The gate line that a plurality of be arranged in parallel perpendicular to this m bar first data line and this m bar second data line, is used for receiving signal; A plurality of first display units, each first display unit are coupled in this m bar first data line a corresponding gate line in corresponding first data line and this a plurality of gate lines; A plurality of second display units, each second display unit are coupled in this m bar second data line a corresponding gate line in corresponding second data line and this a plurality of gate lines; And one source pole driver, be coupled to this m bar first data line and this m bar second data line, be used to provide m group data-signal, wherein each data-signal is to export corresponding first data line in this m bar first data line in the period 1 of a write cycle, and exports corresponding second data line in this m bar second data line to the second round of this write cycle.
The present invention provides a kind of method that drives liquid crystal indicator in addition, and its period 1 that is included in a write cycle is exported the number of it is believed that of m stroke count respectively to corresponding m bar first data line; And export this m stroke count number of it is believed that respectively to respectively adjacent to corresponding m bar second data line of this m bar first data line in the second round of this write cycle, stop to export this m stroke count number of it is believed that simultaneously to this m bar first data line.
Description of drawings
Fig. 1 is the synoptic diagram of a LCD in the prior art.
Fig. 2 is the sequential chart of prior art LCD when running.
Fig. 3 is the synoptic diagram of a LCD among the present invention.
Fig. 4 is the synoptic diagram of one source pole driver among the present invention.
Fig. 5 is the sequential chart of LCD of the present invention when operating.
[primary clustering symbol description]
10,30 LCD, 12,32 display panels
14,34 source electrode drivers, 16,18,36 gate drivers
40 offset buffers, 42 data latching devices
44DAC 46 output buffers
48 ON-OFF control circuit SWO, SWE switch
GL
1～GL
nGate line
P (1,1)～P (m, n) pixel
DL
1～DL
m, DO
1～DO
m, DE
1～DE
mData line
Embodiment
Please refer to Fig. 3, Fig. 3 is the synoptic diagram of a LCD 30 among the present invention.LCD 30 comprises a display panels 32, one source pole driver 34 and a gate drivers 36.Display panels 32 is provided with a plurality of data lines parallel to each other, a plurality of gate lines G L parallel to each other
1～GL
nAnd a plurality of display unit P (1,1)～P (m, n), DO wherein
1～DO
mRepresent odd number bar data line, and DE
1～DE
mRepresent even number bar data line.Each display unit on the display panels 32 all includes a thin film transistor switch and a liquid crystal capacitance, and each liquid crystal capacitance sees through a corresponding thin film transistor switch and is coupled to a corresponding data line.Source electrode driver 34 can produce and be relevant to the data-signal of desiring show image, and gate drivers 36 can produce opens the required signal of TFT switch.When the TFT of display unit switch is opened by signal, the liquid crystal capacitance of this display unit can be electrically connected to its corresponding data line to receive the data-signal that transmits from source electrode driver 34, therefore display unit can be controlled the rotation degree of liquid crystal molecule according to the electric charge (its polarity is represented by "+" or " _ ") of its liquid crystal capacitance internal memory, to show the image of different GTGs.
In LCD 30 of the present invention, the setting interlaced with each other of data line and gate line, yet display unit P (1,1)～P (m, n) only be located at the confluce of corresponding odd number bar data line and odd number bar gate line respectively, or the confluce of corresponding even number bar data line and even number bar gate line.That is the bar data is online is provided with (n/2) individual display unit (supposing that n is an even number) for each, is provided with m display unit and each bar grid is online, so is provided with (m*n) individual display unit on the display panels 32 altogether.For instance, (m, the position that is provided with n) comprises odd number bar data line DO to display unit P (1,1)～P
1With odd number bar gate lines G L
1～GL
N-1(n/2) individual confluce, or even number bar data line DE
1With even number bar gate lines G L
2～GL
n(n/2) individual confluce.
Please refer to Fig. 4, Fig. 4 is the synoptic diagram of source electrode driver 34 among the present invention.Source electrode driver 34 comprises an offset buffer (shift register) 40, one data latching device (datalatch) 42, a digital analog converter (digital-to-analog converter, DAC) 44, one output buffer 46, and an ON-OFF control circuit 48.Offset buffer 40 can produce corresponding frequency control signal according to frequency signal CLK and start signal SP.Data latching device 42 can come input data signal is taken a sample according to frequency control signal, and produces corresponding sampled data signal.Digital analog converter 44 can be an analog data signal with the sampled data conversion of signals, sees through the corresponding data-signal Y1～Ym of output buffer 46 outputs again.ON-OFF control circuit 48 is coupled to odd number bar data line DO
1～DO
mWith even number bar data line DE
1～DE
m, can control signal transmission path between m group data-signal Y1～Ym and the data line according to control signal CSo and CSe.Odd number bar data line DO
1～DO
mThe data-signal that receives is represented by YO1～YOm respectively, and even number bar data line DE
1～DE
mThe data-signal that receives is then represented by YE1～YEm respectively.
ON-OFF control circuit 48 comprises m odd number switch SW O and m even number switch SW E, controls its unlatching by control signal CSo and CSe respectively or closes, and wherein control signal CSo and CSe are the periodic signal of 180 ° of phase differential.Odd number switch SW O and even number switch SW E can be the assembly of transistor switch or other tool similar functions.ON-OFF control circuit 48 comprises m input end and 2m output terminal, and each input end sees through a corresponding odd number switch and a corresponding even number switch is coupled to two output terminals.For instance, when control signal CSo is noble potential and control signal CSe when being electronegative potential, odd number switch SW O for unlatching even number switch SW E for closing, this moment, ON-OFF control circuit 48 can be sent to odd number bar data line DO respectively with data-signal Y1～Ym
1～DO
mIn like manner, when control signal CSo is electronegative potential and control signal CSe when being noble potential, odd number switch SW O is for closing even number switch SW E for opening, and this moment, ON-OFF control circuit 48 can be sent to even number bar data line DE respectively with data-signal Y1～Ym
1～DE
m
Please refer to Fig. 5, the sequential chart when Fig. 5 operates for LCD 30 of the present invention.In Fig. 5, transverse axis is represented the time, longitudinal axis representative voltage position standard.Fig. 5 explains with the first stroke data-signal Y1 of output buffer 46, and the period T of data-signal Y1 comprises a positive polarity drive cycle (being represented by "+" among Fig. 5) and a negative polarity drive cycle (being represented by " _ " among Fig. 5).YO1 and YE1 be representative data line DO respectively
1And DE
1Received data-signal, and GS1 and GS2 represent the drive waveforms of gate line respectively.CSo and CSe representation switch control signal, and V
ComRepresent common voltage.Data line DO
1Write cycle comprise a charge cycle Tco and and keep period T ho, switch controlling signal CSo is noble potential when charge cycle Tco, and is electronegative potential when keeping period T ho; Data line DE
1Write cycle comprise a charge cycle Tce and and keep period T he, switch controlling signal CSe is noble potential when charge cycle Tce, and is electronegative potential when keeping period T he.
When charge cycle Tco, switch controlling signal CSo and signal GS1 are all had a noble potential, and this moment, odd number switch SW O was conducting and even number switch SW E for closing, so data line DO
1Received data-signal YO1 equals the data-signal Y1 that ON-OFF control circuit 48 is exported, and data line DE
1Then be equivalent to be coupled to a high impedance.When keeping period T ho, switch controlling signal CSo is an electronegative potential and signal GS1 is a noble potential, this moment data line DO
1Be equivalent to be coupled to a high impedance, its data-signal YO1 is no longer provided by data-signal Y1, but utilizes data line DO
1Stray capacitance itself is kept, so the current potential of the data-signal YO1 Δ Vo that can slightly descend.Because data line DO
1The liquid crystal capacitance of stray capacitance in the display unit, so the value of Δ Vo is minimum, and is little to the influence of data correctness.
On the other hand, as data line DO
1Enter when keeping period T ho data line DE
1Then enter charge cycle Tce, that is switch controlling signal CSe and signal GS2 all have a noble potential, this moment, odd number switch SW O was conducting for closing even number switch SW E, so data line DE
1Received data-signal YE1 equals the data-signal Y1 that ON-OFF control circuit 48 is exported, and data line DO
1Then be equivalent to be coupled to a high impedance.When keeping period T he, switch controlling signal CSe is an electronegative potential and signal GS2 is a noble potential, this moment data line DE
1Be equivalent to be coupled to a high impedance, its data-signal YE1 is no longer provided by output signal Y1, but utilizes data line DE
1Stray capacitance itself is kept, so the source output YE1 Δ Ve that can slightly rise.Because data line DE
1The liquid crystal capacitance of stray capacitance in the display unit, so the value of Δ Ve is minimum, and is little to the influence of data correctness.
In the present invention, each data-signal is to export corresponding first data line in the period 1 of a write cycle, and exports corresponding second data line to next write cycle, so alternately exports a picture to and finishes.First data line and second data line only have one group of data line to receive signal from source electrode driver at one time, and another organizes not that the data line of received signal then can utilize the big stray capacitance of self to keep the electric current of liquid crystal capacitance.Compared to prior art, the present invention used for two stages (charge cycle and the keep the cycle) display unit that charges equally, but two stages all use correct data-signal, can't be influenced by the data-signal of last display unit.The stray capacitance that the present invention sees through data line self is provided at the current potential when keeping the cycle, therefore can effectively increase discharging and recharging the time of liquid crystal capacitance.Simultaneously, source electrode driver 34 of the present invention can see through ON-OFF control circuit the m stroke count number of it is believed that Y1～Ym is sent to 2m bar data line in the corresponding cycle, not only reduced the wiring area, also can reduce power consumption simultaneously.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to claim scope of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. the liquid crystal indicator in duration of charging that can extend is characterized in that, comprises:
First data line that the m bar be arranged in parallel;
Second data line that the m bar be arranged in parallel, each second data line are located between two corresponding first data lines, and are parallel to this corresponding first data line;
The gate line that a plurality of be arranged in parallel perpendicular to this m bar first data line and this m bar second data line, is used for receiving signal;
A plurality of first display units, each first display unit are coupled in this m bar first data line a corresponding gate line in corresponding first data line and this a plurality of gate lines;
A plurality of second display units, each second display unit are coupled in this m bar second data line a corresponding gate line in corresponding second data line and this a plurality of gate lines; And
The one source pole driver, be coupled to this m bar first data line and this m bar second data line, be used to provide m group data-signal, wherein each data-signal is to export corresponding first data line in this m bar first data line in the period 1 of a write cycle, and exports corresponding second data line in this m bar second data line to the second round of this write cycle.
2. liquid crystal indicator as claimed in claim 1 is characterized in that, this source electrode driver is to comprise:
One ON-OFF control circuit comprises:
M organizes input end, is used for receiving this m group data-signal respectively;
M organizes first output terminal, is respectively coupled to corresponding m bar first data line;
M organizes second output terminal, is respectively coupled to corresponding m bar second data line;
M organizes first switch, and each first switch comprises:
One first end is coupled to a corresponding input end in this m group input end;
One second end is coupled to this m and organizes corresponding first output terminal in first output terminal; And
One control end is used for receiving one first control signal that is relevant to this first and second cycle; And
M organizes second switch, and each second switch comprises:
One first end is coupled to a corresponding input end in this m group input end;
One second end is coupled to this m and organizes corresponding second output terminal in second output terminal; And
One control end is used for receiving one second control signal that is relevant to this first and second cycle.
3. liquid crystal indicator as claimed in claim 2 is characterized in that, this source electrode driver comprises in addition:
One offset buffer is used for according to frequency signal and start signal to produce corresponding frequency control signal;
One data latching device is coupled to this offset buffer, is used for carrying out data sampling according to this frequency control signal, and produces corresponding sampled data signal;
One digital analog converter is coupled to this data latching device, and being used for this sampled data conversion of signals is analog data signal; And
One output buffer is coupled between this digital analog converter and this ON-OFF control circuit, is used for according to corresponding this m group data-signal of this analog data signal output to this ON-OFF control circuit.
4. liquid crystal indicator as claimed in claim 2 is characterized in that, this first and second switch is to comprise transistor.
5. liquid crystal indicator as claimed in claim 1 is characterized in that, also comprises:
One gate drivers is coupled to this a plurality of gate lines, is used to provide this signal.
6. liquid crystal indicator as claimed in claim 1 is characterized in that, each display unit comprises a thin film transistor switch and a liquid crystal capacitance.
7. method that drives liquid crystal indicator, it comprises:
Export the number of it is believed that of m stroke count respectively to corresponding m bar first data line in the period 1 of a write cycle; And
Export this m stroke count number of it is believed that respectively to respectively adjacent to corresponding m bar second data line of this m bar first data line in the second round of this write cycle, stop to export this m stroke count number of it is believed that simultaneously to this m bar first data line.
8. method as claimed in claim 7 is characterized in that, also comprising provides this m stroke count number of it is believed that.
9. method as claimed in claim 7 is characterized in that, also is included in this second round this m bar first data line to be electrically connected to a high impedance.
10. method as claimed in claim 7 is characterized in that, also is included in this first and second cycle to export the signal of a tool noble potential display unit is electrically connected to corresponding data line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910118910A CN101826311B (en) | 2009-03-06 | 2009-03-06 | LCD device capable of prolonging charging time and related driving method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910118910A CN101826311B (en) | 2009-03-06 | 2009-03-06 | LCD device capable of prolonging charging time and related driving method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101826311A true CN101826311A (en) | 2010-09-08 |
| CN101826311B CN101826311B (en) | 2012-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910118910A Expired - Fee Related CN101826311B (en) | 2009-03-06 | 2009-03-06 | LCD device capable of prolonging charging time and related driving method thereof |
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