CN101615383A - Be used for driving method and relevant apparatus that LCD reduces consumed power - Google Patents
Be used for driving method and relevant apparatus that LCD reduces consumed power Download PDFInfo
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- CN101615383A CN101615383A CN200810110255A CN200810110255A CN101615383A CN 101615383 A CN101615383 A CN 101615383A CN 200810110255 A CN200810110255 A CN 200810110255A CN 200810110255 A CN200810110255 A CN 200810110255A CN 101615383 A CN101615383 A CN 101615383A
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Abstract
The invention provides a kind of driving method, in order to reduce the consumed power of LCD.This driving method includes and receives one first data and one second data in regular turn; Judge whether these second data are identical with these first data; And when these second data are identical with these first data, control a data line drive circuit and do not read a driving data corresponding to these second data.
Description
Technical field
The present invention relates to a kind of driving method and relevant apparatus that is used for LCD, relate to a kind of driving method and relevant apparatus that is used for reducing the consumed power and the electromagnetic interference (EMI) of LCD especially.
Background technology
Because LCD (liquid crystal display) has low radiation, volume is little and advantage such as low power consuming, replace traditional cathode-ray tube display (cathode ray tube display) gradually, and be widely used in notebook computer (notebook computer), personal digital assistant (personaldigital assistant, PDA), flat-surface television, or on the information products such as mobile phone.
The drive system of LCD generally is made of time schedule controller, a data line drive circuit and one scan line drive circuit.Time schedule controller is used for according to the image data that is received, required clock signal and control signal when producing the driving data of liquid crystal panel and liquid crystal panel running.Data line drive circuit and scan line drive circuit then come the actuating logic computing according to driving data, control signal and clock signal respectively, to produce the drive signal of data line (Data Line) and sweep trace (Scan Line).
For instance, the clock signal that time schedule controller produced includes horizontal clock signal (CPH) and vertical clock signal (CPV); Control signal then includes horizontal start signal (STH), vertically start signal (STV), data are written into signal (LD), polarity control signal (POL) and output enable signal (OE) or the like, they are known to the person that has the general knowledge of this area, do not give unnecessary details at this.In addition, data line drive circuit and scan line drive circuit can be made up of multiple source driver and a plurality of gate drivers respectively.Each source electrode driver or gate drivers can be used for driving many data lines or sweep trace respectively, and the source electrode driver that LCD is required and the quantity of gate drivers are then decided according to resolution.
In known technology, data line drive circuit can be a unit with the sweep trace usually, by the data line drive signal of row output corresponding to same sweep trace, to drive the image data that display panels shows a picture.In this case, data line drive circuit needs to read the driving data that time schedule controller is exported in regular turn, to produce corresponding data line drive signal according to control signal and clock signal.
Please refer to Fig. 1, Fig. 1 is the driving sequential chart of known LCD.T_DATA represents driving data that time schedule controller is exported, CPH represents horizontal clock signal, and STH represents horizontal start signal, and LD represents that data are written into signal, POL represents polarity control signal, and LINE_n then represents the data line drive signal of a data line in the LCD.Reference clock when wherein, horizontal clock signal C PH is used to provide the data drive circuit running; Horizontal start signal STH is used for the trigger data line drive circuit, to receive the driving data that time schedule controller is exported; Data are written into signal LD and are used for the output of control data line drive signal; Polarity control signal POL then is used for the polarity of control data line drive circuit institute output data line drive signal.In addition, for convenience of description, the driving data T_DATA that time schedule controller is exported presents in the block mode, and each block is represented the driving data corresponding to same sweep trace, blank block then is used for representing blanking signal (Blanking), to separate adjacent driving data.
For (N-1) bar sweep trace, known technology at first produces the horizontal start signal STH corresponding to (N-1) bar sweep trace, receives corresponding driving data block with the control data line drive circuit.Then, the data that known technology produces corresponding to (N-1) bar sweep trace are written into signal LD, with control data line drive circuit output data line drive signal, and the polarity of polarization control signal POL translation data line drive signal.For N bar and (N+1) bar sweep trace, similar operation can repeatedly be carried out.
Yet, when two image datas that time schedule controller received in regular turn are identical, for example corresponding to the image data of (N-1) bar and N bar sweep trace, known technology still can be according to two same image data that received, repeat to produce corresponding driving data, clock signal and control signal, to drive (N-1) bar and N bar sweep trace respectively.Yet so way will cause redundant power consumption.In addition, along with the raising of LCD resolution, unnecessary signal transmission also causes serious electromagnetic interference problem easily.
Summary of the invention
Therefore, the present invention promptly is to provide a kind of driving method and relevant apparatus that a LCD reduces consumed power that be used for.
The present invention has disclosed a kind of driving method that a LCD reduces consumed power that is used for.This driving method includes and receives one first data and one second data in regular turn; Judge whether these second data are identical with these first data; And when these second data are identical with these first data, control a data line drive circuit and do not read a driving data corresponding to these second data.
The present invention has also disclosed a kind of drive unit that a LCD reduces power consumption that is used for.This drive unit includes a data line drive circuit and time schedule controller.This data line drive circuit is used for producing a data line drive signal according to a control signal and a driving data, to drive this LCD.This time schedule controller is coupled to this data line drive circuit, is used for producing this control signal and this driving data, includes a receiving end, a judging unit and a control signal generating unit.Receiving end is used for receiving in regular turn one first data and one second data.Judging unit is coupled to this receiving end, is used for judging whether these second data are identical with these first data.Control signal generating unit is coupled to judging unit, is used for producing and set this control signal when these second data are identical with these first data, does not read a driving data corresponding to these second data to control this data line drive circuit.
Description of drawings
Fig. 1 is the driving sequential chart of known LCD.
Fig. 2 reduces the synoptic diagram that one of consumed power drives flow process for the present invention is used for LCD.
Fig. 3 is used for the embodiment synoptic diagram that LCD is saved a drive system of power consumption for the present invention.
Fig. 4 is the driving sequential chart of the present invention's one LCD.
Fig. 5 is the synoptic diagram of a data line drive circuit.
Fig. 6～8 are the driving sequential chart of a LCD of application drawing 5 data line drive circuits of the present invention.
Fig. 9～11 are respectively the synoptic diagram that drives the data line drive circuit function mode of sequential corresponding to Fig. 6～8.
[main element symbol description]
The T_DATA driving data
The horizontal clock signal of CPH
The horizontal start signal of STH
The LD data are written into signal
The POL polarity control signal
LINE_n, DRV data line drive signal
20 drive flow process
200,210,220,230,240,250 steps
30 drive systems
31,50 data line drive circuits
32 time schedule controllers
The CTRL control signal
321 receiving ends
322 judging units
323 control signal generating unit
324 driving data generation units
325 clock signal generation units
The horizontal clock signal of CPH
401,404,405,407 pulses
402,403,406,601,701,702,801,802 blocks
SD1～SD5 source electrode driver
Embodiment
Please refer to Fig. 2, Fig. 2 reduces the synoptic diagram that one of consumed power drives flow process 20 for the present invention is used for LCD.Drive flow process 20 and be applied in the time schedule controller of LCD, it includes the following step:
Step 200: beginning.
Step 210: receive one first image data and one second image data in regular turn.
Step 220: judge whether second image data is identical with first image data.When second image data is identical with first image data, carry out step 230; When second image data and first image data are inequality, carry out step 240.
Step 230: control a data line drive circuit and do not read a driving data corresponding to second image data.
Step 240: the control data line drive circuit reads the driving data corresponding to second image data.
Step 250: finish.
According to driving flow process 20, the present invention judges whether second image data is identical with first image data after receiving second image data.When second image data was identical with first image data, the data line drive circuit that the present invention controls LCD did not read the driving data corresponding to second image data.Preferably, the present invention by not producing a horizontal start signal (STH) of data line drive circuit, does not read driving data corresponding to second image data with the control data line drive circuit when second image data is identical with first image data.
Thus, time schedule controller two image datas receiving in regular turn when identical, because data drive circuit can not receive the horizontal start signal corresponding to second image data, therefore data drive circuit can not receive the driving data of second image data, and can be directly according to the driving data of first image data, output is corresponding to the data line drive signal of second image data, to save consumed power.
In addition, when second image data is identical with first image data, because data drive circuit can not receive the driving data of second image data, therefore the present invention can further stop to produce driving data and the clock control signal corresponding to second image data, reducing required generation of time schedule controller and data quantity transmitted, and then reduce the problem of electromagnetic interference (EMI) significantly.
Certainly, when second image data and first image data are inequality, the present invention drives flow process 20 except the control data line drive circuit reads driving data corresponding to second image data, other comprises the steps such as driving data, control signal and clock signal of generation corresponding to second image data, it is not given unnecessary details at this for known to the person that has the general knowledge of this area.
Please continue with reference to figure 3, Fig. 3 is used for the embodiment synoptic diagram that LCD is saved a drive system 30 of power consumption for the present invention.Drive system 30 is used for realizing driving flow process 20, with the consumed power of reduction LCD.Drive system 30 includes a data line drive circuit 31 and time schedule controller 32.Data line drive circuit 31 is used for producing a data line drive signal DRV according to a control signal CTRL and a driving data T_DATA, to drive LCD.Time schedule controller 32 is coupled to data line drive circuit 31, and it includes a receiving end 321, a judging unit 322 and a control signal generating unit 323.Receiving end 321 is used for receiving in regular turn one first image data and one second image data.Judging unit 322 is coupled to receiving end 321, is used for judging whether second image data is identical with first image data.Control signal generating unit 323 is coupled to judging unit 322, is used for when second image data is identical with first image data, produces also to set control signal CTRL, does not read driving data corresponding to second image data with control data line drive circuit 31.
Preferably, the control signal CTRL that time schedule controller 32 produced is written into signal (LD), polarity control signal (POL) and output enable signal signals such as (OE) and is formed by horizontal start signal (STH), vertical start signal (STV), data.When second image data that receives in regular turn when time schedule controller 32 is identical with first image data, the control signal CTRL that time schedule controller 32 of the present invention is produced will not comprise horizontal start signal, promptly do not produce horizontal start signal, do not read driving data corresponding to second image data with control data line drive circuit 31.
Thus, when 32 two image datas that receive in regular turn of time schedule controller are identical, because data drive circuit 31 can not receive the horizontal start signal corresponding to second image data, therefore data drive circuit 31 can not receive the driving data of second image data, and can be directly according to the driving data of first image data, output is corresponding to the data line drive signal of second image data, to save consumed power.
In addition, time schedule controller 32 includes a driving data generation unit 324 and a clock signal generation unit 325 in addition.Driving data generation unit 324 and clock signal generation unit 325 are respectively coupled to judging unit 322, are used for the image data that received according to receiving end 321 and the judged result of judging unit 322, produce a driving data T_DATA and a horizontal clock signal C PH.
When second image data is identical with first image data, because data drive circuit 31 can not receive the driving data of second image data, therefore driving data generation unit 324 and clock signal generation unit 325 can be further according to the judged result of judging unit 322, stop to produce driving data and clock signal corresponding to second image data, reducing time schedule controller 32 required generation and data quantity transmitted, and then reduce the problem of electromagnetic interference (EMI) significantly.
It should be noted that, above-mentioned first image data and second image data can be the image datas corresponding to two adjacent sweep traces in the LCD, or two in the adjacent scan-line data corresponding to the image data of same source electrode driver (Source Driver), and be not limited thereto.
For instance, please refer to Fig. 4, Fig. 4 is the driving sequential chart of the present invention's one LCD.T_DATA represents time schedule controller 32 driving data of exporting, CPH represents horizontal clock signal, and STH represents horizontal start signal, and LD represents that data are written into signal, POL represents polarity control signal, and LINE_n then represents the data line drive signal of a data line in the LCD.For convenience of description, the driving data T_DATA that time schedule controller 32 is exported presents in the block mode, each block is represented the driving data corresponding to same sweep trace, and blank block then is used for representing blanking signal (Blanking), to separate adjacent driving data.As shown in Figure 4, when the image data of judging the N bar sweep trace that is received when time schedule controller 32 is identical with the image data of (N-1) bar sweep trace, will can not produced by time schedule controller 32 corresponding to the horizontal start signal (being pulse 401) of N bar sweep trace.In this case, data line drive circuit 31 can be by horizontal start signal triggers and the driving data (being block 402) of N bar sweep trace is received, and can directly be written into signal (being pulse 404) and polarity control signal (being pulse 405) according to the driving data (being block 403) of (N-1) bar sweep trace, corresponding data, output is corresponding to the data line drive signal of N bar sweep trace, to save consumed power.Further, time schedule controller 32 can stop to produce driving data (being block 402) and the corresponding clock signal corresponding to N bar sweep trace, reducing time schedule controller 32 required generation and data quantity transmitted, and then reduce the problem of electromagnetic interference (EMI) significantly.
On the other hand, when the image data of the image data of (N+1) bar sweep trace and N bar sweep trace is inequality, 32 image datas of time schedule controller according to (N+1) bar sweep trace, produce corresponding driving data (being block 406) and horizontal start signal (being pulse 407), produce the data line drive signal of (N+1) bar sweep trace with control data line drive circuit 31.On the contrary, data line drive circuit 31 can continue to be written into signal, polarity driven signal according to the driving data of (N-1) bar sweep trace and corresponding data, and output is corresponding to the data line drive signal of (N+1) bar sweep trace.
In addition, because data line drive circuit generally is made up of the multiple source driver, so the present invention can also source electrode driver be unit, determines whether to carry out the reception of driving data.Please refer to Fig. 5, Fig. 5 is the synoptic diagram of a data line drive circuit 50.Data line drive circuit 50 includes source electrode driver SD1～SD5, and wherein each source electrode driver is used to drive corresponding a plurality of data lines.Preferably, data line drive circuit 50 can carry out addressing in advance to each source electrode driver.Therefore, the control signal CTRL that time schedule controller 32 is produced, for example horizontal start signal STH can embed (Embedded) and transmit in the blanking zone of driving data, to save the arrangement space of circuit trace.
Please refer to Fig. 6～8, Fig. 6～8 are the driving sequential chart of the LCD of another embodiment of the present invention application data line drive circuit 50.Compared to Fig. 4, driving data T_DATA only represents the driving data of N bar sweep trace, and each block is represented the driving data corresponding to same source electrode driver, and horizontal start signal STH then is embedded in the blanking signal block of driving data and transmits.Please refer to Fig. 6, under general situation, promptly in the N bar sweep trace corresponding to the image data of source electrode driver SD1～SD5 all with (N-1) bar sweep trace when inequality, time schedule controller 32 can be according to the driving data of the image data generation that is received corresponding to source electrode driver SD1～SD5, and in the blanking signal block, embed horizontal start signal (being block 601) corresponding to source electrode driver SD1, read driving data in regular turn with control data driving circuit 50 corresponding to source electrode driver SD1～SD5.Thus, data drive circuit 50 can further be written into signal LD and polarity inversion signal POL according to data, produces corresponding data line drive signal.In this case, the function mode of data drive circuit 50, as shown in Figure 9.
On the contrary, if in the N bar sweep trace corresponding to the image data of some source electrode driver when identical with (N-1) bar sweep trace, time schedule controller 32 can source electrode driver be a unit, does not carry out the transmission of identical driving data.For instance, please refer to Fig. 7, when time schedule controller 32 is judged in the N bar sweep trace image data corresponding to source electrode driver SD1 and SD4 when identical with (N-1) bar sweep trace, at this moment, time schedule controller 32 need not produce the driving data corresponding to source electrode driver SD1 and SD4, to save power consumption.In this case, the horizontal start signal (being block 701 and 702) that time schedule controller 32 can reach the horizontal start signal corresponding to source electrode driver SD2, SD3 corresponding to source electrode driver SD5 is embedded in respectively in the driving data, reads in the driving data of source electrode driver SD2, SD3 and SD5 in regular turn with control data driving circuit 31.About data drive circuit 50 function mode this moment, please refer to Figure 10.
In other words, for source electrode driver SD1 and SD4, because N bar sweep trace is identical with the driving data of (N-1) bar sweep trace, therefore time schedule controller 32 need not produce the driving data of source electrode driver SD1 and SD4, and data drive circuit 31 does not also need to receive corresponding driving data, to save power consumption.At last, data drive circuit 50 still can be written into signal LD and polarity inversion signal POL according to data, produces corresponding data line drive signal.
On the other hand, if in the N bar sweep trace corresponding to the image data of source electrode driver SD3 and SD5 when identical with (N-1) bar sweep trace, its associated drives sequential is then as shown in Figure 8.Similarly, time schedule controller 32 need not produce the driving data corresponding to source electrode driver SD3 and SD5, and the horizontal start signal (being block 801 and 802) that the horizontal start signal corresponding to source electrode driver SD1, SD2 can be reached corresponding to source electrode driver SD4 is embedded in respectively in the driving data, reads in the driving data of source electrode driver SD1, SD2 and SD4 in regular turn with control data driving circuit 31.In this case, the function mode of data drive circuit 50, as shown in figure 11.
That is to say that the present invention can source electrode driver be a unit, whether decision carries out the reception of driving data, or further stops to produce corresponding driving data, to save power consumption.Note that the foregoing description only for of the present invention illustrating, this area has general knowledge person does suitable modification when visual actual demand.For example the image data of N bar sweep trace is divided into more small fragment or is divided into modes such as R, G, B, to compare with (N-1) bar sweep trace.Corresponding variation like this all belongs to scope of the present invention.
In sum, the present invention be time schedule controller two image datas receiving in regular turn when identical, the control data line drive circuit does not read corresponding driving data, saving power consumption, and then reduces the problem of electromagnetic interference (EMI).
The above only is preferred embodiment of the present invention, and every equalization of being done according to the present patent application claim changes and modifies, and all should belong to covering scope of the present invention.
Claims (19)
1. one kind is used for the driving method that a LCD reduces consumed power, includes:
Receive one first data and one second data in regular turn;
Judge whether these second data are identical with these first data; And
When these second data are identical with these first data, control a data line drive circuit and do not read a driving data corresponding to these second data.
2. driving method as claimed in claim 1, wherein, these first data and this second data are the data corresponding to two adjacent sweep traces in this LCD.
3. driving method as claimed in claim 1, wherein, these first data and this second data are corresponding to the image data of the same source electrode driver (SourceDriver) of this data line drive circuit in the two adjacent scan-line datas.
4. driving method as claimed in claim 1, wherein, when these second data are identical with these first data, control this data line drive circuit and do not read this driving data corresponding to these second data, when these second data are identical with these first data, do not produce a horizontal start signal of this data line drive circuit.
5. driving method as claimed in claim 1, wherein, this data line drive circuit produces the data line drive signal corresponding to these second data according to the driving data corresponding to these first data.
6. driving method as claimed in claim 5 wherein, is produced according to these first data corresponding to this driving data of this first data time schedule controller by this LCD.
7. driving method as claimed in claim 1, it comprises in addition:
When these second data are identical with these first data, do not produce this driving data corresponding to these second data.
8. driving method as claimed in claim 1, it comprises in addition:
When these second data are identical with these first data, do not produce a clock control signal corresponding to these second data.
9. one kind is used for the drive unit that a LCD reduces power consumption, includes:
One data line drive circuit is used for producing a data line drive signal according to a control signal and a driving data, to drive this LCD; And
Time schedule controller is coupled to this data line drive circuit, is used for producing this control signal and this driving data, includes:
One receiving end is used for receiving in regular turn one first data and one second data;
One judging unit is coupled to this receiving end, is used for judging whether these second data are identical with these first data; And
One control signal generating unit is coupled to judging unit, is used for producing and set this control signal when these second data are identical with these first data, does not read a driving data corresponding to these second data to control this data line drive circuit.
10. drive unit as claimed in claim 9, wherein, these first data and this second data are the data corresponding to two adjacent sweep traces in this LCD.
11. drive unit as claimed in claim 9, wherein, these first data and this second data are corresponding to the image data of the same source electrode driver (SourceDriver) of this data line drive circuit in the two adjacent scan-line datas.
12. drive unit as claimed in claim 9, wherein, this control signal generating unit is when these second data are identical with these first data, set the horizontal start signal that this control signal does not comprise this data line drive circuit, do not read this driving data corresponding to these second data to control this data line drive circuit.
13. drive unit as claimed in claim 9, wherein, this data line drive circuit produces the data line drive signal corresponding to these second data according to the driving data corresponding to these first data.
14. drive unit as claimed in claim 13 wherein, is produced according to these first data by this time schedule controller corresponding to this driving data of this first data, and is temporary in this data line drive circuit.
15. drive unit as claimed in claim 9, wherein, this control signal generating unit in addition when these second data and this first data are inequality, produces this control signal, reads this driving data corresponding to these second data to control this source electrode driver.
16. drive unit as claimed in claim 9, wherein, this time schedule controller comprises in addition:
One driving data generation unit is coupled to this judging unit, is used for according to these first data and this second data, produces corresponding to a driving data of these first data and corresponding to this driving data of this second data.
17. drive unit as claimed in claim 16, wherein, when these second data were identical with these first data, this driving data generation unit did not produce this driving data corresponding to these second data.
18. drive unit as claimed in claim 9, wherein, this time schedule controller comprises in addition:
One clock signal generation unit is coupled to this judging unit, is used for producing corresponding to a clock control signal of these first data and corresponding to a clock control signal of these second data.
19. drive unit as claimed in claim 18, wherein, when these second data were identical with these first data, this clock signal generation unit did not produce this clock control signal corresponding to these second data.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810110255A CN101615383A (en) | 2008-06-23 | 2008-06-23 | Be used for driving method and relevant apparatus that LCD reduces consumed power |
| CN201310626296.3A CN103680440B (en) | 2008-06-23 | 2008-06-23 | Drive method and device for decreasing consumed power of liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810110255A CN101615383A (en) | 2008-06-23 | 2008-06-23 | Be used for driving method and relevant apparatus that LCD reduces consumed power |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310626296.3A Division CN103680440B (en) | 2008-06-23 | 2008-06-23 | Drive method and device for decreasing consumed power of liquid crystal display |
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| CN101615383A true CN101615383A (en) | 2009-12-30 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102890919A (en) * | 2011-07-20 | 2013-01-23 | 联咏科技股份有限公司 | Source driver array and drive method of source driver array as well as liquid crystal drive device |
| CN103489392A (en) * | 2013-10-22 | 2014-01-01 | 合肥京东方光电科技有限公司 | Time schedule control method, time program controller and display device |
| CN111933081A (en) * | 2020-08-31 | 2020-11-13 | 京东方科技集团股份有限公司 | Display control method, display control module and display device |
| CN112599104A (en) * | 2019-10-01 | 2021-04-02 | 夏普株式会社 | Display control device, display device, recording medium, and control method |
-
2008
- 2008-06-23 CN CN200810110255A patent/CN101615383A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102890919A (en) * | 2011-07-20 | 2013-01-23 | 联咏科技股份有限公司 | Source driver array and drive method of source driver array as well as liquid crystal drive device |
| CN103489392A (en) * | 2013-10-22 | 2014-01-01 | 合肥京东方光电科技有限公司 | Time schedule control method, time program controller and display device |
| CN112599104A (en) * | 2019-10-01 | 2021-04-02 | 夏普株式会社 | Display control device, display device, recording medium, and control method |
| US11307822B2 (en) | 2019-10-01 | 2022-04-19 | Sharp Kabushiki Kaisha | Display control device, display device, and control method |
| CN111933081A (en) * | 2020-08-31 | 2020-11-13 | 京东方科技集团股份有限公司 | Display control method, display control module and display device |
| US11348535B2 (en) | 2020-08-31 | 2022-05-31 | Chengdu Boe Optoelectronics Technology Co., Ltd. | Display control method, display control module and display device |
| CN111933081B (en) * | 2020-08-31 | 2023-02-17 | 京东方科技集团股份有限公司 | Display control method, display control module and display device |
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Application publication date: 20091230 |