CN102136262B - Display actuating device - Google Patents
Display actuating device Download PDFInfo
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- CN102136262B CN102136262B CN201010003338.4A CN201010003338A CN102136262B CN 102136262 B CN102136262 B CN 102136262B CN 201010003338 A CN201010003338 A CN 201010003338A CN 102136262 B CN102136262 B CN 102136262B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 30
- 230000003139 buffering effect Effects 0.000 abstract 4
- 230000000052 comparative effect Effects 0.000 description 20
- 230000004913 activation Effects 0.000 description 16
- 238000010586 diagram Methods 0.000 description 14
- 238000010276 construction Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000035484 reaction time Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The embodiment of the invention provides a display actuating device comprising a digital analog conversion circuit and an output buffering circuit, wherein the digital analog conversion circuit receives digital display data and generates a gray-scale voltage according to the display data; the output buffering circuit is provided with an output end to generate an output signal; the output buffering circuit receives the gray-scale voltage, a precharging enabled signal and an output signal and provides a precharging output signal to the output end of the output buffering circuit according to the comparison result of the gray-scale voltage and the output signal and the precharging enabled signal.
Description
Technical field
The present invention relates to a kind of drive unit, and particularly relate to a kind of drive unit that is applied to display.
Background technology
In the drive unit of display, in order to promote the quality of demonstration, conventionally can design a kind of circuit of so-called precharge.This precharge meeting makes drive unit (for example source electrode driver) before the corresponding demonstration of the picture element gray scale voltage that data produce is provided, and first exports a pre-charge pressure to picture element.Thereby picture element can be charged in advance before driven, to reduce reaction time and the current drain of picture element.
In existing drive unit, precharging circuit only provides fixing pre-charge pressure at specific time point, and this is in the situation that different gray scale voltages can produce pre-charge pressure deficiency or too much phenomenon.Below please refer to Figure 1A and Figure 1B, wherein Figure 1A and Figure 1B are respectively the different output signal schematic diagram of existing drive unit.In the diagram of Figure 1A, the preliminary filling that drive unit first provides voltage quasi position to equal level Veq according to preliminary filling enable signal PreEn outputs signal to output signal VSO.And provide voltage quasi position to using as output signal VSO higher than the drive output signal of level Veq according to output enable signal SOE.In this case, because the voltage quasi position of preliminary filling output signal is not enough, can have influence on the usefulness of precharge, and when drive output signal is produced, also need the regular hour just can rise to value and the power consumption of needed gray scale voltage higher.
Contrary, in the diagram of Figure 1B, but the voltage quasi position Veq of preliminary filling output signal is far above the voltage quasi position of drive output signal.The phenomenon that this pre-charge pressure is too high, can cause too much unnecessary power consumption of drive unit.
Summary of the invention
The invention provides the drive unit of three kinds of displays, in order to the gray scale voltage producing according to demonstration data, adjust the voltage quasi position of produced preliminary filling output signal.
The present invention proposes a kind of drive unit of display, comprises D/A conversion circuit and output buffer.D/A conversion circuit receives digital demonstration data, and according to showing that data are to produce gray scale voltage.Output buffer couples D/A conversion circuit, has output terminal to produce output signal.Output buffer receives gray scale voltage, preliminary filling enable signal and output signal, and according to the comparative result of gray scale voltage and output signal and preliminary filling enable signal to provide preliminary filling to output signal to the output terminal of output buffer.
In an embodiment of the present invention, above-mentioned output buffer comprises precharging circuit.Precharging circuit receives preliminary filling enable signal and comparative result, and when the activation of preliminary filling enable signal, precharging circuit provides preliminary filling output signal according to comparative result, wherein in precharging circuit, is built in output buffer.
In an embodiment of the present invention, above-mentioned output buffer also comprises reception output enable signal.Output buffer according to output enable signal with output drive output signal.
In an embodiment of the present invention, above-mentioned buffer circuit is operational amplifier.Operational amplifier has first input end, the second input end, preliminary filling activation input end and output terminal.Its first input end receives gray scale voltage, and its second input end receives drive output signal, and its preliminary filling activation input end receives preliminary filling enable signal, and its output terminal comprises generation drive output signal or preliminary filling output signal.
In an embodiment of the present invention, above-mentioned D/A conversion circuit is voltage selector.Voltage selector is exported one of them of most voltages to be selected according to demonstration data selection.
The present invention also proposes a kind of drive unit of display, comprises D/A conversion circuit, output buffer and precharging circuit.D/A conversion circuit receives digital demonstration data, and according to showing that data are to produce gray scale voltage.Output buffer couples D/A conversion circuit and receives gray scale voltage.Output buffer has output terminal to produce drive output signal.Precharging circuit couples output buffer, according to gray scale voltage and preliminary filling enable signal, produces preliminary filling output signal.Precharging circuit also transmits the output terminal that preliminary filling outputs signal to output buffer.
In an embodiment of the present invention, above-mentioned precharging circuit directly receives gray scale voltage and when preliminary filling enable signal is activation, according to gray scale voltage, produces preliminary filling output signal.
In an embodiment of the present invention, above-mentioned precharging circuit receives gray scale voltage and preliminary filling enable signal, and when preliminary filling enable signal is activation, according to the comparative result of gray scale voltage and output signal with generation preliminary filling output signal.
The present invention also proposes a kind of drive unit of display, comprises D/A conversion circuit, output buffer and precharging circuit.D/A conversion circuit receives digital demonstration data, and according to showing that data are to produce gray scale voltage.Output buffer couples D/A conversion circuit, has output terminal to produce output signal.Output buffer receives gray scale voltage and output signal, and compares gray scale voltage and output signal, to produce comparative result.Precharging circuit couples output buffer, according to comparative result and preliminary filling enable signal, produces the output terminal that preliminary filling outputs signal to output buffer.
Based on above-mentioned, the present invention shows that by foundation gray scale voltage that data produce adjusts the voltage swing of its preliminary filling output signal producing.Make preliminary filling output signal not can because of be fix and produce excessive preliminary filling or the situation of preliminary filling deficiency.Except effective saving power, can also rise to the display quality of display.
For the above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate appended graphic being described in detail below.
Accompanying drawing explanation
Figure 1A, Figure 1B are respectively the different output signal schematic diagram of existing drive unit;
Fig. 2 is the schematic diagram of drive unit 200 of the display of one embodiment of the invention;
Fig. 3 is the enlarged diagram of the output buffer 220 of Fig. 2 embodiment of the present invention;
Fig. 4 is the schematic diagram of drive unit 400 of the display of another embodiment of the present invention;
The enlarged diagram of the output buffer 420 of the embodiment of the present invention that Fig. 5 is;
Fig. 6 is the schematic diagram of the drive unit 600 of the display of an embodiment more of the present invention.
Description of reference numerals:
200,400,600: drive unit; 210,410,610: D/A conversion circuit;
220,420,620: output buffer; 221,430,630: precharging circuit;
M1, M2: transistor; VIOP: gray scale voltage;
VIN: input voltage; CMP: comparative result;
SOE: output enable signal; PreEn: preliminary filling enable signal;
VSO: output signal; Veq: level.
Embodiment
Please refer to Fig. 2, the schematic diagram of the drive unit 200 of the display that Fig. 2 is one embodiment of the invention.Drive unit 200 comprises D/A conversion circuit 210 and output buffer 220.D/A conversion circuit 210 receives digital demonstration data DIN, and according to showing that data DIN is to produce gray scale voltage VIOP.Output buffer 220 couples D/A conversion circuit 210, and receives gray scale voltage VIOP, preliminary filling enable signal PreEn and output enable signal SOE.
In the present embodiment, D/A conversion circuit 210 utilizes voltage selector to carry out construction.Wherein voltage selector receives and according to digital demonstration data DIN, selects one of them of a plurality of input voltage VIN of received a plurality of simulations as gray scale voltage VIOP.Take show data DIN as 3 be example, D/A conversion circuit 210 can receive 8 input voltage VIN and be used as the foundation of selecting.
Output buffer 220 produces drive output signal according to output enable signal SOE usings as output signal VSO, and according to preliminary filling enable signal PreEn, produces preliminary filling output signal and using as output signal VSO.Simple, output buffer 220 is usingd as output signal VSO producing drive output signal when output enable signal SOE is activation, and when preliminary filling enable signal PreEn is activation, produces preliminary filling output signal and using as output signal VSO.And output enable signal SOE and preliminary filling enable signal PreEn wherein can not be enabled simultaneously.
In addition, output buffer 220, in the moment when preliminary filling enable signal PreEn activation, can come to compare and produce comparative result with gray scale voltage VIOP according to the drive output signal receiving.Then, output buffer 220 is deciding the voltage quasi position of produced preliminary filling output signal according to this comparative result.So, the voltage quasi position of the preliminary filling output signal that output buffer 220 is exported just can dynamically be adjusted according to the difference of gray scale voltage VIOP and drive output signal, avoids the too high or too low generation of voltage quasi position of preliminary filling output signal.
Referring to Fig. 3 and Fig. 2, Fig. 3 is wherein the enlarged diagram of the output buffer 220 of Fig. 2 embodiment of the present invention below.In output buffer 220, have precharging circuit 221.Precharging circuit 221 receives preliminary filling enable signal PreEn and receives according to comparing obtained comparative result by gray scale voltage VIOP and drive output signal (at this precharging state (state of preliminary filling enable signal PreEn activation), drive output signal is output signal VSO).When the activation of preliminary filling enable signal, precharging circuit 221 provides preliminary filling output signal to using as output signal VSO according to above-mentioned comparative result.
Be worth mentioning in addition, output buffer 220 can carry out construction by operational amplifier.Operational amplifier as output buffer 220 has first input end, the second input end, preliminary filling activation input end and output terminal.Its first input end receives gray scale voltage VIOP, and its second input end receives the output signal VSO as drive output signal, and its preliminary filling activation input end receives preliminary filling enable signal PreEn, and its output terminal produces output signal VSO.(at this, note that as previously mentioned, output signal VSO can be drive output signal or preliminary filling output signal, and under precharging state, output signal VSO is drive output signal).
Then please refer to Fig. 4, the schematic diagram of the drive unit 400 of the display that Fig. 4 is another embodiment of the present invention.Drive unit 400 comprises D/A conversion circuit 410, output buffer 420 and precharging circuit 430.D/A conversion circuit 410 receives digital demonstration data DIN, and according to showing that data DIN is to produce gray scale voltage VIOP.Wherein, in the present embodiment, D/A conversion circuit 410 utilizes voltage selector to carry out construction.That is to say, D/A conversion circuit 410 is to be used as gray scale voltage VIOP according to one of them that shows that data DIN selects received a majority input voltage VIN.
Output buffer 420 couples D/A conversion circuit 410 and receives gray scale voltage VIOP.Output buffer 420 has the output terminal of the output signal of producing.And in the present embodiment, output buffer 420 receives output enable signal SOE and comparative result CMP.At this, comparative result CMP can compare to produce by gray scale voltage VIOP relatively and as the output signal VSO of drive output signal.
If gray scale voltage VIOP will be more carefully described and as the comparison of the output signal VSO of drive output signal, the enlarged diagram of the output buffer 420 of the embodiment of the present invention that please refer to Fig. 5 and be.Wherein output buffer 420 includes utilize transistor M1, M2 to form differential to (differential pair), and transistor M1 and M2 receive respectively gray scale voltage VIOP and as the output signal VSO of drive output signal.So, comparative result CMP just can produce at transistor M1 and the formed differential right common end of M2 (the namely interconnective source/drain of transistor M1, M2).
In fact, output buffer 420 can utilize operational amplifier to realize, and operational amplifier has first input end, the second input end and output terminal, and its first input end receives gray scale voltage VIOP, and its second input end is coupled to its output terminal.And in operational amplifier, generally include at least one group differential right.That is to say, when output buffer 420 is while utilizing amplifier to form, comparative result CMP can directly utilize original just exist differential to producing, and does not need extra circuit.
Please, again with reference to Fig. 4, precharging circuit 430 is coupled to output buffer 420, and precharging circuit 430 receives by the output buffer 420 comparative result CMP that produces, and precharging circuit 430 also receives preliminary filling enable signal PreEn.When preliminary filling enable signal PreEn activation, the output terminal that precharging circuit 430 provides preliminary filling to output signal to output buffer 420 according to comparative result is usingd as output signal VSO.Note that the output enable signal SOE that now output buffer 420 receives is forbidden energy, therefore, output buffer 420 maintains at this moment high impedance (high impendence) and can not conflict mutually with the output of precharging circuit 430.
Then, preliminary filling enable signal PreEn transfers forbidden energy to, and output enable signal SOE transfers activation to.Precharging circuit 430 also corresponding enable signal PreEn forbidden energy and convert high impedance to.Output buffer 420 corresponding conversion becomes the output enable signal SOE of activation and exports drive output signal to using as output signal VSO.
Please pay special attention to, precharging circuit 430 is that the voltage swing of provided preliminary filling output signal is dynamically provided according to the comparative result CMP of preliminary filling output signal and output signal VSO.That is to say, the drive unit 400 of the present embodiment can provide the preliminary filling output signal of the voltage quasi position of more pressing close to required gray scale voltage VIOP, reduces unnecessary electric weight consume.
Below please refer to Fig. 6, Fig. 6 is the schematic diagram of the drive unit 600 of the display of an embodiment more of the present invention.Drive unit 600 comprises D/A conversion circuit 610, output buffer 620 and precharging circuit 630.The drive unit 400 of last embodiment not identical be to be that output buffer 620 does not provide comparative result to precharging circuit 630.Precharging circuit 630 is directly to receive the foundation that gray scale voltage VIOP is used as providing preliminary filling output signal.
In sum, the gray scale voltage that the present invention directly utilizes digital demonstration data to change, or the comparative result that utilizes gray scale voltage and output signal to compare, make the drive unit of display (when preliminary filling enable signal is activation) during preliminary filling that the preliminary filling output signal that is close to gray scale voltage is provided.Make the preliminary filling action of display have more usefulness, and can effectively avoid the waste of power.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (4)
1. a drive unit for display, comprising:
One D/A conversion circuit, receives one of numeral and show data, and the described demonstration data of foundation is to produce a gray scale voltage;
One output buffer, couples described D/A conversion circuit, has output terminal to produce an output signal, and described output buffer receives described gray scale voltage and described output signal; And
One precharging circuit, couple described output buffer and this D/A conversion circuit, this gray scale voltage and the preliminary filling enable signal that receive and export according to this D/A conversion circuit produce the output terminal that a preliminary filling outputs signal to described output buffer, described output buffer also comprises reception one output enable signal, and the described output enable signal of described output buffer foundation is to provide the output terminal of a drive output signal to described output buffer.
2. the drive unit of display according to claim 1, wherein said D/A conversion circuit is a voltage selector, described voltage selector is according to one of them of most voltages to be selected of described demonstration data selection output.
3. the drive unit of display according to claim 1, wherein said output buffer is an operational amplifier, described operational amplifier has first input end, the second input end and output terminal, its first input end receives described gray scale voltage, and its second input end is coupled to its output terminal.
4. the drive unit of display according to claim 3, it is one differential right that wherein said operational amplifier includes, described differential right input end is used for respectively receiving described gray scale voltage and described output signal, with more described gray scale voltage and described output signal, produce described output signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010003338.4A CN102136262B (en) | 2010-01-21 | 2010-01-21 | Display actuating device |
| CN201410009990.5A CN103778880B (en) | 2010-01-21 | 2010-01-21 | The driving means of display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010003338.4A CN102136262B (en) | 2010-01-21 | 2010-01-21 | Display actuating device |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410009990.5A Division CN103778880B (en) | 2010-01-21 | 2010-01-21 | The driving means of display |
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| Publication Number | Publication Date |
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| CN102136262A CN102136262A (en) | 2011-07-27 |
| CN102136262B true CN102136262B (en) | 2014-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010003338.4A Expired - Fee Related CN102136262B (en) | 2010-01-21 | 2010-01-21 | Display actuating device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10403224B2 (en) * | 2016-08-10 | 2019-09-03 | Novatek Microelectronics Corp. | Control method and control device for charging time sharing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1573902A (en) * | 2003-06-24 | 2005-02-02 | 恩益禧电子股份有限公司 | Display control circuit |
| CN101221714A (en) * | 2007-01-12 | 2008-07-16 | 联詠科技股份有限公司 | Driving device and driving method thereof |
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2010
- 2010-01-21 CN CN201010003338.4A patent/CN102136262B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1573902A (en) * | 2003-06-24 | 2005-02-02 | 恩益禧电子股份有限公司 | Display control circuit |
| CN101221714A (en) * | 2007-01-12 | 2008-07-16 | 联詠科技股份有限公司 | Driving device and driving method thereof |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2002-169501A 2002.06.14 |
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| CN102136262A (en) | 2011-07-27 |
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Granted publication date: 20140723 |