CN101556773B - Data driven unit and drive method thereof - Google Patents
Data driven unit and drive method thereof Download PDFInfo
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- CN101556773B CN101556773B CN2008101036039A CN200810103603A CN101556773B CN 101556773 B CN101556773 B CN 101556773B CN 2008101036039 A CN2008101036039 A CN 2008101036039A CN 200810103603 A CN200810103603 A CN 200810103603A CN 101556773 B CN101556773 B CN 101556773B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012544 monitoring process Methods 0.000 claims description 13
- 230000005669 field effect Effects 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 6
- 239000004973 liquid crystal related substance Substances 0.000 description 5
- 230000001934 delay Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
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- 239000010409 thin film Substances 0.000 description 1
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Abstract
The invention relates to a data driven unit and a drive method thereof. The data driven unit comprises a first switching element, a second switching element and a polarity controller, wherein the first switching element is connected between a drive chip buffer and an output end of a drive chip; the second switching element is serially connected with a delay load and connected between the drive chip buffer and the output end of the drive chip; the polarity controller is connected with the first switching element and the second switching element and controls one of the first switching element and the second switching element to be conductive, while the other one to be broken. The drive method comprises the steps that the polarity controller monitors the polarity of data voltage; when the polarity changes, the polarity controller controls the first switching element to be conductive to ensure that the drive chip buffer and the output end of the drive chip are directly connected; and when the polarity is unchanged, the polarity controller controls the second switching element to be conductive to ensure that the drive chip buffer and the output end of the drive chip are connected by thedelay load. The invention reduces the deviation of output waveforms of two rows of grate lines, improves the concealed wire phenomenon and increases the display quality.
Description
Technical field
The present invention relates to a kind of Drive And Its Driving Method of LCD, particularly a kind of data driven unit and driving method thereof.
Background technology
At present, the occupation rate of Thin Film Transistor-LCD (TFT-LCD) is more and more higher.TFT-LCD is developing to large scale and high resolving power direction aspect size, number of colours and the resolution.
Among the existing TFT-LCD, it doesn't matter for the output mode of data-driven integrated circuit (Driver IC) and the counter-rotating of polarity, because the waveform delay degree of data-driven integrated circuit output is different after the waveform of data-driven integrated circuit output and the reverse under identical polar, can produce concealed wire (dim line) phenomenon.Fig. 6 a, Fig. 6 b are the synoptic diagram that 2 inversion modes of prior art drive, and Fig. 6 a is the synoptic diagram of n frame, and Fig. 6 b is the synoptic diagram of n+1 frame.First row shown in Fig. 6 a, the data voltage of data-driven integrated circuit output was a positive polarity when the 1st row grid line G1 and the 2nd row grid line G2 opened, the data voltage of data driven unit output was a negative polarity when the 3rd row grid line G3 and the 4th row grid line G4 opened, when the grid of the 1st row grid line G1 was opened, the data voltage of data-driven integrated circuit output was changed to positive polarity by negative polarity; When the grid of the 2nd row grid line G2 was opened, the data voltage of output was a positive polarity still, does not have polar switching; When the grid of the 3rd row grid line G3 was opened, the data voltage of data-driven integrated circuit output was changed to negative polarity by positive polarity; When the grid of the 4th row grid line G4 was opened, the data voltage of output was a negative polarity still, does not have polar switching.(just becoming or just becoming negative as negative) when change in polarity, it is big that the data voltage drive area of input becomes relatively, and output waveform postpones bigger, and (become negative or just just becoming as negative) when polarity does not change, and the output waveform delay is less.
Fig. 7 is a prior art data-driven integrated circuit output waveform figure, and solid line is the output waveform of the 1st row grid line data-driven integrated circuit when opening among the figure, and dot-and-dash line is the output waveform of the 2nd row grid line data-driven integrated circuit when opening.For the 1st row grid line, the reversing of data-driven integrated circuit output data voltage, the increase of drive area have caused more serious charging to postpone; For the 2nd row grid line, the polarity of data-driven integrated circuit output data voltage does not change, and the charging delay degree is slighter.From Fig. 7 more as can be seen, the delay of data voltage output is greater than the delay of data voltage output on the 2nd row grid line on the 1st row grid line, the deviation of this data voltage output switching rate (slew rate) causes horizontal concealed wire phenomenon, has reduced the picture display quality.
Summary of the invention
The purpose of this invention is to provide a kind of data driven unit and driving method thereof, according to the reversing situation of data voltage of output corresponding data voltage output waveform is set and postpones, effectively overcome the concealed wire phenomenon, improve the picture display quality of liquid crystal indicator.
To achieve these goals, the invention provides a kind of data driven unit, comprising:
First on-off element is connected between driver chip impact damper and the driver chip output terminal;
The second switch element is connected in series with postponing load, is connected between driver chip impact damper and the driver chip output terminal;
Polarity controller, be connected with the second switch element with described first on-off element, be used for when monitoring the data voltage reversing, control the described first on-off element conducting, the disconnection of described second switch element, and monitoring data voltage polarity when not changing, controlling that described first on-off element disconnects, described second switch element conductive.
Described first on-off element is a PNP transistor, and its base stage is connected with described polarity controller, and its emitter is connected with described driver chip impact damper, and its collector is connected with described driver chip output terminal.Described second switch element is a NPN transistor, and its base stage is connected with described polarity controller, and its emitter is connected with described driver chip impact damper, and its collector is connected with described driver chip output terminal by described delay load.
Described first on-off element is a N channel field-effect pipe, and its grid is connected with described polarity controller, and its source electrode is connected with described driver chip impact damper, and its drain electrode is connected with described driver chip output terminal.Described first on-off element is the P-channel field-effect transistor (PEFT) pipe, and its grid is connected with described polarity controller, and its source electrode is connected with described driver chip impact damper, and its drain electrode is connected with described driver chip output terminal by described delay load.
On the technique scheme basis, described polarity controller is the polarity of Monitoring Data voltage and according to reversing and corresponding output high level or low level control-signals generator.
To achieve these goals, the present invention also provides a kind of data-driven method, comprising: the polarity of polarity controller Monitoring Data voltage; When reversing, polarity controller is exported first signal, and the first on-off element conducting makes the driver chip impact damper directly be connected with the driver chip output terminal; When polarity does not change, polarity controller output secondary signal, the second switch element conductive makes the driver chip impact damper be connected by postponing load with the driver chip output terminal.
The present invention proposes a kind of data driven unit and driving method thereof, by the delay load is set, the charging that increases data voltage output when data voltage polarity does not change postpones, reduced to greatest extent data voltage reversing and data voltage polarity do not change between the gap of two delays, minimize the deviation of data voltage output waveform on the two row grid lines, improve the concealed wire phenomenon, improved display quality.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the structural representation of data driven unit of the present invention;
Fig. 2 is the structural representation of data driven unit first embodiment of the present invention;
Fig. 3 is the structural representation of data driven unit second embodiment of the present invention;
Fig. 4 is the process flow diagram of data-driven method of the present invention;
Fig. 5 is the output waveform figure of data-driven method of the present invention;
Fig. 6 a, Fig. 6 b are the synoptic diagram that 2 inversion modes of prior art drive;
Fig. 7 is a prior art data-driven integrated circuit output waveform figure.
Embodiment
Fig. 1 is the structural representation of data driven unit of the present invention.As shown in Figure 1, data driven unit of the present invention comprises first on-off element 1, second switch element 2, postpone load 3 and polarity controller 4, wherein first on-off element 1 is connected between driver chip impact damper 10 and the driver chip output terminal 20, second switch element 2 and delay load 3 serial connections, and be connected together between driver chip impact damper 10 and the driver chip output terminal 20, polarity controller 4 is connected with second switch element 2 with first on-off element 1 respectively, the polarity that is used for Monitoring Data voltage, and disconnect or 2 conductings of first on-off element, 1 disconnection/second switch element according to the reversing situation of data voltage output corresponding control signals first on-off element 1 conducting/second switch element 2.When the reversing of data voltage of output, 1 conducting of polarity controller 4 controls first on-off element, second switch element 2 disconnects, and driver chip impact damper 10 directly is connected with driver chip output terminal 20, to the data voltage of the no any processing of liquid crystal panel output; When the polarity of the data voltage of exporting does not change, 2 conductings of polarity controller 4 control second switch elements, first on-off element 1 disconnects, connect by postponing load 3 between driver chip impact damper 10 and the driver chip output terminal 20, owing to postpone the effect of load 3, to the data voltage of liquid crystal panel output through phase delay.
Since the data voltage of output when reversing with polarity when not changing data voltage export switching rate deviation arranged, charging when charging during the data voltage reversing postpones to be greater than polarity and do not change postpones, so data driven unit of the present invention has proposed a kind of reversing situation according to data voltage the technical scheme that corresponding output waveform postpones is set.The present invention is by being provided with the delay load, the charging that increases data voltage when polarity does not change postpones, and when the reversing of data voltage, the output waveform of data voltage is not carried out any processing, therefore make the present invention can be when 2 inversion modes drive, reduced to greatest extent data voltage reversing and data voltage polarity do not change between the gap of two delays, minimize the deviation of data voltage output waveform on the two row grid lines, improve the concealed wire phenomenon, improved display quality.
Fig. 2 is the structural representation of data driven unit first embodiment of the present invention.As shown in Figure 1, the present embodiment data driven unit comprises PNP transistor 11, NPN transistor 21, postpones load 3 and polarity controller 4, wherein the base stage of PNP transistor 11 is connected with polarity controller 4, its emitter is connected with driver chip impact damper 10, and its collector is connected with driver chip output terminal 20; The base stage of NPN transistor 21 is connected with polarity controller 4, and its emitter is connected with driver chip impact damper 10, and its collector connection delay load 3 postpones load 3 and is connected with driver chip output terminal 20.
In the present embodiment, polarity controller 4 is used for the polarity of Monitoring Data voltage, and exports corresponding high level or low level according to reversing, control PNP transistor 11 and NPN transistor 21 conductings or disconnection.For example, can preestablish polarity controller 4 and when the data voltage reversing, export high level, output low level when data voltage polarity does not change, therefore, when polarity controller 4 monitoring data polarity of voltages change, the output high level, then PNP transistor 11 conductings, NPN transistor 21 is ended, and driver chip impact damper 10 directly is connected with driver chip output terminal 20, to the data voltage of the no any processing of liquid crystal panel output; When polarity controller 4 monitoring data polarity of voltages do not change, output low level, then PNP transistor 11 is ended, NPN transistor 21 conductings, connect by postponing load 3 between driver chip impact damper 10 and the driver chip output terminal 20, owing to postpone the effect of load 3, to the data voltage of liquid crystal panel output through phase delay.
Present embodiment utilizes the conducting and the cut-off characteristics of PNP transistor and NPN transistor, by exporting the deviation that high level or low level control signal can minimize data voltage output waveform on the two row grid lines, has improved the concealed wire phenomenon.Present embodiment only is a kind of preferred enforcement structure, in actual the use, can preestablish polarity controller 4 output low level when the data voltage reversing, output high level when data voltage polarity does not change, simultaneously PNP transistor and NPN transistor are exchanged, also can realize the object of the invention.
Fig. 3 is the structural representation of data driven unit second embodiment of the present invention.As shown in Figure 3, the present embodiment data driven unit comprises N channel field-effect pipe 12, P-channel field-effect transistor (PEFT) pipe 22, postpones load 3 and polarity controller 4, wherein the grid of N channel field-effect pipe 12 is connected with polarity controller 4, its source electrode is connected with driver chip impact damper 10, and its drain electrode is connected with driver chip output terminal 20; The grid of P-channel field-effect transistor (PEFT) pipe 22 is connected with polarity controller 4, and its source electrode is connected with driver chip impact damper 10, and its drain electrode connection delay load 3 postpones load 3 and is connected with driver chip output terminal 20.The principle of work of present embodiment is identical with first embodiment, and just on-off element adopts field effect transistor, can realize the object of the invention equally, and its course of work repeats no more.
Fig. 4 is the process flow diagram of data-driven method of the present invention, is specially:
The polarity of step 1, polarity controller Monitoring Data voltage; When reversing, execution in step 2; When polarity does not change, execution in step 3;
In the present embodiment, first signal and secondary signal can be respectively high level and low level, also can be respectively low level and high level, according to the actual conditions setting.
Since the data voltage of output when reversing with polarity when not changing data voltage export switching rate deviation arranged, charging when charging during the data voltage reversing postpones to be greater than polarity and do not change postpones, so data-driven method of the present invention has proposed a kind of reversing situation according to data voltage the technical scheme that corresponding output waveform postpones is set.The present invention is by being provided with the delay load, the charging that increases data voltage when polarity does not change postpones, and when the reversing of data voltage, the output waveform of data voltage is not carried out any processing, therefore make the present invention can be when 2 inversion modes drive, reduced to greatest extent data voltage reversing and data voltage polarity do not change between the gap of two delays, minimize the deviation of data voltage output waveform on the two row grid lines, improve the concealed wire phenomenon, improved display quality.
Fig. 5 is the output waveform figure of data-driven method of the present invention.As shown in Figure 5, the output waveform figure when solid line is reversing, dot-and-dash line are that polarity does not change and the output waveform figure when not carrying out any processing, and dotted line is the output waveform figure after polarity is handled through the present invention when not changing.By more as can be seen, when not carrying out any processing, during the data voltage reversing and the output waveform figure of polarity when not changing have than large deviation, after postponing processing through the present invention, during the data voltage reversing and the output waveform figure deviation of polarity when not changing reduce, therefore improve the concealed wire phenomenon, improved display quality.
It should be noted that at last: above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (5)
1. a data driven unit is characterized in that, comprising:
First on-off element is connected between driver chip impact damper and the driver chip output terminal;
The second switch element is connected in series with postponing load, is connected between driver chip impact damper and the driver chip output terminal;
Polarity controller, be connected with the second switch element with described first on-off element, be used for when monitoring the data voltage reversing, control the described first on-off element conducting, the disconnection of described second switch element, and monitoring data voltage polarity when not changing, controlling that described first on-off element disconnects, described second switch element conductive.
2. data driven unit according to claim 1, it is characterized in that described first on-off element is a PNP transistor, its base stage is connected with described polarity controller, its emitter is connected with described driver chip impact damper, and its collector is connected with described driver chip output terminal; Described second switch element is a NPN transistor, and its base stage is connected with described polarity controller, and its emitter is connected with described driver chip impact damper, and its collector is connected with described driver chip output terminal by described delay load.
3. data driven unit according to claim 1, it is characterized in that described first on-off element is a N channel field-effect pipe, its grid is connected with described polarity controller, its source electrode is connected with described driver chip impact damper, and its drain electrode is connected with described driver chip output terminal; Described second switch element is the P-channel field-effect transistor (PEFT) pipe, and its grid is connected with described polarity controller, and its source electrode is connected with described driver chip impact damper, and its drain electrode is connected with described driver chip output terminal by described delay load.
4. according to the described data driven unit of arbitrary claim in the claim 1～3, it is characterized in that described polarity controller is the polarity of Monitoring Data voltage and according to reversing and corresponding output high level or low level control-signals generator.
5. a data-driven method that adopts the described data driven unit of arbitrary claim in the claim 1～4 is characterized in that, comprising: the polarity of polarity controller Monitoring Data voltage; When reversing, polarity controller is exported first signal, and the first on-off element conducting makes the driver chip impact damper directly be connected with the driver chip output terminal; When polarity does not change, polarity controller output secondary signal, the second switch element conductive makes the driver chip impact damper be connected by postponing load with the driver chip output terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101036039A CN101556773B (en) | 2008-04-09 | 2008-04-09 | Data driven unit and drive method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101036039A CN101556773B (en) | 2008-04-09 | 2008-04-09 | Data driven unit and drive method thereof |
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| CN101556773A CN101556773A (en) | 2009-10-14 |
| CN101556773B true CN101556773B (en) | 2011-06-08 |
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| TWI823078B (en) * | 2021-04-22 | 2023-11-21 | 大陸商集創北方（珠海）科技有限公司 | Source driver chips that can reduce heat energy generation and liquid crystal displays and information processing devices that utilize them |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1581258A (en) * | 2003-08-12 | 2005-02-16 | 精工爱普生株式会社 | Display and its driving method, and projection type display |
| CN101055362A (en) * | 2002-04-24 | 2007-10-17 | 三星电子株式会社 | Liquid crystal display |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101055362A (en) * | 2002-04-24 | 2007-10-17 | 三星电子株式会社 | Liquid crystal display |
| CN1581258A (en) * | 2003-08-12 | 2005-02-16 | 精工爱普生株式会社 | Display and its driving method, and projection type display |
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