CN102800275A - Driving device and method of display - Google Patents
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- CN102800275A CN102800275A CN2011102795546A CN201110279554A CN102800275A CN 102800275 A CN102800275 A CN 102800275A CN 2011102795546 A CN2011102795546 A CN 2011102795546A CN 201110279554 A CN201110279554 A CN 201110279554A CN 102800275 A CN102800275 A CN 102800275A
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Abstract
The invention provides a driving device of a display, including a shifting register, a first latching unit, a second latching unit, a data comparison unit, and a level selection unit. The shifting register generates a plurality of latching signals based on a synchronous signal. The first latching unit latches a data signal based on the latching signals to obtain a plurality of first data corresponding to a plurality of channels. The second latching unit is coupled to the first latching unit to respond to a latching data signal in order to latch the first data of the channel into a plurality of second data. The data comparison unit responds to the latching data signal to respectively compare the first data and the second data which are corresponding to the same channels to output a plurality of third data corresponding to the channels. The level selection unit selects a plurality of voltage levels corresponding to the channels based on the third data.
Description
Technical field
The invention relates to a kind of drive unit and method of display.
Background technology
Please with reference to Fig. 1, it illustrates the synoptic diagram of the drive unit of traditional bistable display.Drive unit 10 comprises a shift register 12, one first latch lock unit 14, one second latch lock unit 16, a level selected cell 18 and a buffer cell 19.Shift register 12 is shifted a synchronous signal XDIO who is received step by step, gives first latch lock unit 14 with a plurality of latch-up signals of output out of phase.The latch-up signal that first latch lock unit 14 is exported according to shift register 12 and with data-signal DATA breech lock in the passage of correspondence.
After whole passages of first latch lock unit 14 were all accomplished data latching, second latch lock unit 16 began to store the latch data that first latch lock unit 14 is exported in the negative edge of a latch data signal LD.Electrical level selector 18 is exported corresponding voltage level to buffer cell 19 according to the data of second latch lock unit 16 that is received.Yet when data-signal DATA changes when frequent, the voltage level of buffer cell 19 may switch between PV and the lowest point voltage fast, can cause the generation of burst current thus, and make average current excessive, and then cause system to work as machine.
Summary of the invention
The invention relates to a kind of drive unit and method of display, make the voltage level of buffer cell can rapidly not change, avoid producing burst current and excessive average current through the data that compare corresponding to same channels.
According to a first aspect of the invention, propose a kind of drive unit of display, comprise a shift register, one first latch lock unit, one second latch lock unit, a data comparing unit and a level selected cell.Shift register is in order to produce a plurality of latch-up signals according to a synchronous signal.First latch lock unit in order to according to these a little latch-up signal breech lock one data-signals to obtain a plurality of first data of corresponding a plurality of passages.Second latch lock unit is coupled to first latch lock unit, is a plurality of second data in order to respond a latch data signal with these a little first data of these a little passages of breech lock.The data comparing unit in order to response latch data signal with a little therewith second data of these a little first data of more corresponding same channels respectively to export a plurality of the 3rd data of corresponding these a little passages.The level selected cell is in order to select a plurality of voltage levels of corresponding these a little passages according to these a little the 3rd data.
According to a second aspect of the invention, propose a kind of driving method of display, comprise the following steps.Produce a plurality of latch-up signals according to a synchronous signal.According to these a little latch-up signal breech lock one data-signals to obtain a plurality of first data of corresponding a plurality of passages.Responding a latch data signal is a plurality of second data with these a little first data of these a little passages of breech lock.Response latch data signal with a little therewith second data of these a little first data of more corresponding same channels respectively to export a plurality of the 3rd data of corresponding these a little passages.Select a plurality of voltage levels of corresponding these a little passages according to these a little the 3rd data.
According to a third aspect of the invention we, propose a kind of drive unit of display, comprise a shift register, one first latch lock unit, one second latch lock unit and a buffering output unit.Shift register is in order to produce a plurality of latch-up signals according to a synchronous signal.First latch lock unit in order to according to these a little latch-up signal breech lock one data-signals to obtain a plurality of first data of corresponding a plurality of passages.Second latch lock unit is coupled to first latch lock unit, is a plurality of second data in order to respond a latch data signal with these a little first data of these a little passages of breech lock.The buffering output unit in order to response latch data signal with respectively according to a little therewith second data of these a little first data of corresponding same channels to produce a plurality of the 3rd data of corresponding these a little passages.Wherein, surpass a preset value if one second voltage level of one first voltage level of first data and second data differs, then a tertiary voltage level of the 3rd data is between first voltage level and second voltage level.Wherein, be no more than preset value if one second voltage level of one first voltage level of first data and second data differs, then a tertiary voltage level of the 3rd data is to equal first voltage level.
According to a forth aspect of the invention, propose a kind of driving method of display, comprise the following steps.Produce a plurality of latch-up signals according to a synchronous signal.According to these a little latch-up signal breech lock one data-signals to obtain a plurality of first data of corresponding a plurality of passages.Responding a latch data signal is a plurality of second data with these a little first data of these a little passages of breech lock.Response latch data signal with respectively according to a little therewith second data of these a little first data of corresponding same channels to produce a plurality of the 3rd data of corresponding these a little passages.Wherein, surpass a preset value if one second voltage level of one first voltage level of first data and second data differs, then a tertiary voltage level of the 3rd data is between first voltage level and second voltage level.Wherein, be no more than a preset value if one second voltage level of one first voltage level of first data and second data differs, then a tertiary voltage level of the 3rd data is to equal first voltage level.
For there is better understanding above-mentioned and other aspect of the present invention, hereinafter is special lifts an embodiment, and cooperates appended graphicly, elaborates as follows.
Description of drawings
Fig. 1 illustrates the synoptic diagram of the drive unit of traditional bistable display.
Fig. 2 illustrates the synoptic diagram according to the drive unit of the display of an embodiment.
Fig. 3 illustrates the sequential chart according to the drive unit of the display of an embodiment.
Fig. 4 illustrates the oscillogram according to the data of the voltage level corresponding data comparator C x of the impact damper Sx of an embodiment.
Fig. 5 illustrates the process flow diagram according to the driving method of the display of an embodiment.
[main element label declaration]
10,200: drive unit
12,210: shift register
14,220: the first latch lock units
16,230: the second latch lock units
18,244: the level selected cell
19,250: buffer cell
240: the buffering output unit
242: the data comparing unit
Embodiment
The drive unit of display proposed by the invention and method; Through relatively changing with data a transient voltage is provided when frequent at this passage corresponding to the data of same channels; Make the voltage level of buffer cell can rapidly not change, avoid producing burst current and excessive average current.
Next lift display now and be a bistable state display (Bi-stable Display) for example describes, so be not limited to this, also can be the display of other type.Please with reference to Fig. 2, it illustrates the synoptic diagram according to the drive unit of the display of an embodiment.Display 200 comprises a shift register 210, one first latch lock unit 220, one second latch lock unit 230, a buffering output unit 240 and a buffer cell 250.Buffering output unit 240 comprises a data comparing unit 242 and a level selected cell 244.Corresponding to n passage, first latch lock unit 220 has n latch unit A1～An in fact, and second latch lock unit 230 has n latch unit B1～Bn in fact, and latch unit for example is the line latch unit; Data comparing unit 242 comprises n data comparator C 1～Cn in fact; Level selected cell 244 comprises n electrical level selector D1～Dn in fact; Buffer cell 250 comprises n impact damper S1～Sn in fact, and n is a positive integer.
Please cooperate with reference to Fig. 3, it illustrates the sequential chart according to the drive unit of the display of an embodiment.At first, shift register 210 is shifted the synchronous signal XDIO that received step by step with n the latch-up signal of output corresponding to the out of phase of n passage, and synchronizing signal XDIO for example is a horizontal-drive signal.Latch unit A1～An is respectively according to n first data of corresponding latch-up signal breech lock one data-signal DATA to obtain a corresponding n passage.Second latch lock unit 230 is coupled to first latch lock unit 220.After latch unit A1～An all accomplished data latching, B1～Bn responds a latch data signal LD and for example begins breech lock at its negative edge was n second data corresponding to individual first data of the n of n passage.In this stage, first data that latch unit Bx receives in fact corresponding to the latch unit Ax of same channels are second data, and x is the positive integer of 1～n.
In Fig. 2; First data that data comparator Cx relatively relatively stores corresponding to the latch unit Ax of same channels respectively among the period T1 in data are (like the A ' among Fig. 2; Corresponding to a current latch data signal) second data that store with latch unit Bx are (like the B ' among Fig. 2; Corresponding to a previous latch data signal), with the 3rd data (like the C ' among Fig. 2) of exporting corresponding same channels.In data relatively among the period T1, data comparator Cx can be according to a look-up table to obtain the 3rd data when first data of more corresponding same channels and second data.Please with reference to table 1, it so is not limited to this for the example according to the look-up table of an embodiment, looks closely the practical design demand and decides.
Table 1
| First data | Second data | The 3rd data |
| 00 | 00 | 00 |
| 00 | 01 | 00 |
| 00 | 10 | 00 |
| 00 | 11 | 00 |
| 01 | 00 | 01 |
| 01 | 01 | 01 |
| 01 | 10 | 00 |
| 01 | 11 | 01 |
| 10 | 00 | 10 |
| 10 | 01 | 00 |
| 10 | 10 | 10 |
| 10 | 11 | 10 |
| 11 | 00 | 11 |
| 11 | 01 | 11 |
| 11 | 10 | 11 |
| 11 | 11 | 11 |
Afterwards, second data of corresponding latch unit Bx also are provided in a non-data comparison period T2 is the 3rd data to data comparator Cx.
Preferably, data comparison period T1 originates in the positive edge of latch data signal LD, the position during one first level of latch data signal LD in, its time length can decide by the width of latch data signal LD or by an internal circuit.In addition, preferably, non-data comparison period T2 originates in the negative edge of latch data signal LD, the position during one second level of latch data signal LD in.Non-data comparison period T2 possibly be arranged to direct next-door neighbour or certain interval of time and be connected in data relatively after the period T1.
Electrical level selector Dx selects corresponding voltage level according to the 3rd data of the data comparator Cx output of corresponding same channels.Impact damper Sx receives the voltage level of corresponding electrical level selector Dx output and exports the corresponding data voltage of this passage according to this.Please with reference to table 2, it is the correspondence table according to the voltage level of the data of the data comparator Cx of an embodiment and impact damper Sx.
Table 2
| The data of data comparator Cx | The voltage level of impact damper Sx |
| 00 | 0 volt |
| 01 | + V volt (for example 15 volts) |
| 10 | -V volt (for example-15 volt) |
| 11 | Suspension joint (floating) |
Can learn by table 2, if the data of data comparator Cx change between 01 and 10, then the voltage level of corresponding buffered device Sx can+V volt and-the rapid change of V volt.Therefore; Cooperate table 1 design; When second data of the previous latch data signal of correspondence change between 01 and 10 with first data of corresponding current latch data signal (by 01 become 10 or become 01 by 10) time, the data of data comparator Cx can be changed the 3rd data for a corresponding intermediate voltage level (for example being 0 volt) earlier in data comparison period T1.In non-data compared period T2, first data of corresponding same channels and current data latch-up signal just can be outputted as the 3rd data then.Thus, promptly can avoid the voltage level of impact damper Sx between PV (+V volt) and the lowest point voltage (V volt), to change fast.Please with reference to Fig. 4, it illustrates the oscillogram according to the data of the voltage level corresponding data comparator C x of the impact damper Sx of an embodiment.
In the present embodiment, mainly a transient voltage is provided when frequent, makes the voltage level of buffer cell can rapidly not change, avoid producing burst current and excessive average current through relatively changing with data at this passage corresponding to the data of same channels.As previously mentioned, when second data of the previous latch data signal of correspondence change between 01 and 10 with first data of corresponding current latch data signal, then can be especially with the 3rd data setting to an intermediate voltage level (for example being 0 volt).In other words; If first data correspond to one first voltage level; Second data correspond to one second voltage level; When first voltage level and second voltage level differ when surpassing a preset value, then the corresponding tertiary voltage level of the 3rd data between first voltage level and second voltage level, as transient voltage to slow down change in voltage.When first voltage level and second voltage level differ when being no more than preset value, then the tertiary voltage level equals first voltage level.
The present invention also proposes a kind of driving method of display, and please with reference to Fig. 5, it illustrates the process flow diagram according to the driving method of the display of an embodiment.In step S500, produce a plurality of latch-up signals according to a synchronous signal.In step S510, according to these a little latch-up signal breech lock one data-signals to obtain a plurality of first data of corresponding a plurality of passages.In step S520, responding a latch data signal is a plurality of second data with these a little first data of these a little passages of breech lock.In step S530, response latch data signal with a little therewith second data of these a little first data of more corresponding same channels respectively to export a plurality of the 3rd data of corresponding these a little passages.In step S540, select a plurality of voltage levels of corresponding these a little passages according to these a little the 3rd data.Surpass a preset value if one second voltage level of one first voltage level of first data and second data differs, then a tertiary voltage level of the 3rd data is between first voltage level and second voltage level.Be no more than a preset value if one second voltage level of one first voltage level of first data and second data differs, then a tertiary voltage level of the 3rd data is to equal first voltage level.
The driven square ratio juris of aforementioned display device is to be specified in Fig. 2～Fig. 4 and the related content thereof, so no longer repeat in this.
The drive unit of the display that the above embodiment of the present invention disclosed and method; Through relatively comparing data earlier in the period corresponding to same channels in data; So can change in the data of corresponding this passage a transient voltage is provided when frequent; Can make the voltage level of buffer cell can rapidly not change thus, and then avoid producing burst current and excessive average current.
In sum, though the present invention discloses as above with a plurality of embodiment, so it is not in order to limit the present invention.Have common knowledge the knowledgeable in the technical field under the present invention, do not breaking away from the spirit and scope of the present invention, when doing various changes and retouching.Therefore, protection scope of the present invention is as the criterion when looking appended the claim scope person of defining.
Claims (40)
1. the drive unit of a display comprises:
One shift register is in order to produce a plurality of latch-up signals according to a synchronous signal;
One first latch lock unit, in order to according to these a plurality of latch-up signal breech lock one data-signals to obtain a plurality of first data of corresponding a plurality of passages;
One second latch lock unit is coupled to this first latch lock unit, is a plurality of second data in order to respond a latch data signal with these a plurality of first data of these a plurality of passages of breech lock;
One data comparing unit, in order to respond this latch data signal with these a plurality of first data of more corresponding same channels respectively and this a plurality of second data to export to a plurality of the 3rd data that should a plurality of passages; And
One level selected cell, in order to according to should be a plurality of the selections of the 3rd data to a plurality of voltage levels that should a plurality of passages.
2. the drive unit of display according to claim 1, wherein this display is a bistable state display.
3. the drive unit of display according to claim 1; Wherein this second latch lock unit is relatively carried out this latch operations in the period in non-data of this latch data signal, and this data comparing unit carries out this compare operation in a data comparison period of this latch data signal.
4. the drive unit of display according to claim 3, wherein this data comparing unit is also in these non-data of this latch data signal relatively in the period, and it is these a plurality of the 3rd data that these a plurality of second data are provided.
5. the drive unit of display according to claim 3, wherein this data comparison period is a positive edge that originates in this latch data signal, and this non-data comparison period is a negative edge that originates in this latch data signal.
6. the drive unit of display according to claim 3; Wherein this data comparison period be positioned at this latch data signal one first level during, and this non-data comparison period be originate in this latch data signal one second level during in.
7. the drive unit of display according to claim 1, wherein this data comparing unit comparison is corresponding to this a plurality of first data of a current latch data signal and corresponding to these a plurality of second data of a previous latch data signal.
8. the drive unit of display according to claim 1, wherein this data comparing unit when these first data of more corresponding same channels and this second data, according to a look-up table to obtain the 3rd data.
9. the drive unit of display according to claim 1; Wherein surpass a preset value if one second voltage level of one first voltage level of these first data and these second data differs, then a tertiary voltage level of the 3rd data is between this first voltage level and this second voltage level.
10. the drive unit of display according to claim 1; Wherein be no more than a preset value if one second voltage level of one first voltage level of these first data and these second data differs, then a tertiary voltage level of the 3rd data is to equal this first voltage level.
11. the drive unit of display according to claim 1 also comprises a buffer cell, is coupled to this level selected cell, in order to receive these a plurality of voltage levels and to export a plurality of data voltages according to this.
12. the driving method of a display comprises:
(i) produce a plurality of latch-up signals according to a synchronous signal;
(ii) these a plurality of latch-up signal breech lock one data-signals of foundation are to obtain a plurality of first data of corresponding a plurality of passages;
(iii) responding a latch data signal is a plurality of second data with these a plurality of first data of these a plurality of passages of breech lock;
(iv) respond this latch data signal with these a plurality of first data of more corresponding same channels respectively and this a plurality of second data to export to a plurality of the 3rd data that should a plurality of passages; And
(v) according to should be a plurality of the selections of the 3rd data to a plurality of voltage levels that should a plurality of passages.
13. the driving method of display according to claim 12, wherein this display is a bistable state display.
14. the driving method of display according to claim 12, wherein step (iii) is in a non-data comparison period of this latch data signal, to carry out, and step (iv) is in a data comparison period of this latch data signal, to carry out.
15. the driving method of display according to claim 14, these non-data that also are included in this latch data signal compared in the period, and it is these a plurality of the 3rd data that these a plurality of second data are provided.
16. the driving method of display according to claim 14, wherein this data comparison period is a positive edge that originates in this latch data signal, and this non-data comparison period is a negative edge that originates in this latch data signal.
17. the driving method of display according to claim 14; Wherein this data comparison period be positioned at this latch data signal one first level during, and this non-data comparison period be originate in this latch data signal one second level during in.
18. the driving method of display according to claim 12, wherein step is (iv) also relatively corresponding to this a plurality of first data of a current latch data signal and corresponding to these a plurality of second data of a previous latch data signal.
19. the driving method of display according to claim 12, wherein step (iv) is to use a look-up table to obtain the 3rd data.
20. the driving method of display according to claim 12; Wherein surpass a preset value if one second voltage level of one first voltage level of these first data and these second data differs, then a tertiary voltage level of the 3rd data is between this first voltage level and this second voltage level.
21. the driving method of display according to claim 12; Wherein be no more than a preset value if one second voltage level of one first voltage level of these first data and these second data differs, then a tertiary voltage level of the 3rd data is to equal this first voltage level.
22. the drive unit of a display comprises:
One shift register is in order to produce a plurality of latch-up signals according to a synchronous signal;
One first latch lock unit, in order to according to these a plurality of latch-up signal breech lock one data-signals to obtain a plurality of first data of corresponding a plurality of passages;
One second latch lock unit is coupled to this first latch lock unit, is a plurality of second data in order to respond a latch data signal with these a plurality of first data of these a plurality of passages of breech lock; And
One buffering output unit, in order to respond this latch data signal with respectively according to this a plurality of first data of corresponding same channels and these a plurality of second data with generation to a plurality of the 3rd data that should a plurality of passages;
Wherein, surpass a preset value if one second voltage level of one first voltage level of these first data and these second data differs, then a tertiary voltage level of the 3rd data is between this first voltage level and this second voltage level;
Wherein, be no more than this preset value if one second voltage level of one first voltage level of these first data and these second data differs, then this tertiary voltage level of the 3rd data is to equal this first voltage level.
23. the drive unit of display according to claim 22, wherein this display is a bistable state display.
24. the drive unit of display according to claim 22, wherein this buffering output unit comprises:
One data comparing unit, in order to respond this latch data signal with these a plurality of first data of more corresponding same channels respectively and this a plurality of second data to export to these a plurality of the 3rd data that should a plurality of passages; And
One level selected cell, in order to according to should be a plurality of the selections of the 3rd data to a plurality of voltage levels that should a plurality of passages.
25. the drive unit of display according to claim 24 also comprises a buffer cell, is coupled to this level selected cell, in order to receive these a plurality of voltage levels and to export a plurality of data voltages according to this.
26. the drive unit of display according to claim 24; Wherein this second latch lock unit is relatively carried out this latch operations in the period in non-data of this latch data signal, and this data comparing unit carries out this compare operation in a data comparison period of this latch data signal.
27. the drive unit of display according to claim 26, wherein this data comparing unit also compares in the period in these non-data of this latch data signal, and it is these a plurality of the 3rd data that these a plurality of second data are provided.
28. the drive unit of display according to claim 26, wherein this data comparison period is a positive edge that originates in this latch data signal, and this non-data comparison period is a negative edge that originates in this latch data signal.
29. the drive unit of display according to claim 26; Wherein this data comparison period be positioned at this latch data signal one first level during, and this non-data comparison period be originate in this latch data signal one second level during in.
30. the drive unit of display according to claim 24, wherein this data comparing unit is relatively corresponding to this a plurality of first data of a current latch data signal and corresponding to these a plurality of second data of a previous latch data signal.
31. the drive unit of display according to claim 24, wherein this data comparing unit when these first data of more corresponding same channels and this second data, according to a look-up table to obtain the 3rd data.
32. the driving method of a display comprises:
(a) produce a plurality of latch-up signals according to a synchronous signal;
(b) these a plurality of latch-up signal breech lock one data-signals of foundation are to obtain a plurality of first data of corresponding a plurality of passages;
(c) response one latch data signal is a plurality of second data with these a plurality of first data of these a plurality of passages of breech lock;
(d) respond this latch data signal with respectively according to this a plurality of first data of corresponding same channels and these a plurality of second data with generation to a plurality of the 3rd data that should a plurality of passages;
Wherein, surpass a preset value if one second voltage level of one first voltage level of these first data and these second data differs, then a tertiary voltage level of the 3rd data is between this first voltage level and this second voltage level;
Wherein, be no more than this preset value if one second voltage level of one first voltage level of these first data and these second data differs, then this tertiary voltage level of the 3rd data is to equal this first voltage level.
33. the driving method of display according to claim 32, wherein this display is a bistable state display.
34. the driving method of display according to claim 32, wherein step (d) comprising:
(d1) respond this latch data signal with these a plurality of first data of more corresponding same channels respectively and this a plurality of second data to export to these a plurality of the 3rd data that should a plurality of passages; And
(d2) according to should be a plurality of the selections of the 3rd data to a plurality of voltage levels that should a plurality of passages.
35. the driving method of display according to claim 34; Wherein step (c) is relatively to carry out this latch operations in the period in non-data of this latch data signal, and step (d1) is in a data comparison period of this latch data signal, to carry out this compare operation.
36. the driving method of display according to claim 35, wherein step (d1) also is included in the non-data of this of this latch data signal relatively in the period, and it is these a plurality of the 3rd data that these a plurality of second data are provided.
37. the driving method of display according to claim 34, wherein this data comparison period is a positive edge that originates in this latch data signal, and this non-data comparison period is a negative edge that originates in this latch data signal.
38. the driving method of display according to claim 34; Wherein this data comparison period be positioned at this latch data signal one first level during, and this non-data comparison period be originate in this latch data signal one second level during in.
39. the driving method of display according to claim 32, wherein step (d1) comprises that comparison is corresponding to these a plurality of first data of a current latch data signal and these a plurality of second data corresponding to a previous latch data signal.
40. the driving method of display according to claim 32, wherein step (d1) comprises according to a look-up table to obtain the 3rd data.
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| CN104376809B (en) * | 2013-08-14 | 2017-06-06 | 联咏科技股份有限公司 | Method of the source electrode driver with wherein peak point current is reduced |
| CN112687223A (en) * | 2020-12-28 | 2021-04-20 | 北京奕斯伟计算技术有限公司 | Source electrode driving circuit, source electrode driving method and display device |
| CN112687224A (en) * | 2020-12-28 | 2021-04-20 | 北京奕斯伟计算技术有限公司 | Source electrode driving circuit, source electrode driving method and display device |
| CN112687223B (en) * | 2020-12-28 | 2022-06-03 | 北京奕斯伟计算技术有限公司 | Source electrode driving circuit, source electrode driving method and display device |
| CN112687224B (en) * | 2020-12-28 | 2022-06-03 | 北京奕斯伟计算技术有限公司 | Source electrode driving circuit, source electrode driving method and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102800275B (en) | 2016-04-27 |
| TW201248585A (en) | 2012-12-01 |
| TWI441128B (en) | 2014-06-11 |
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