CN102136262A - Display actuating device - Google Patents
Display actuating device Download PDFInfo
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- CN102136262A CN102136262A CN2010100033384A CN201010003338A CN102136262A CN 102136262 A CN102136262 A CN 102136262A CN 2010100033384 A CN2010100033384 A CN 2010100033384A CN 201010003338 A CN201010003338 A CN 201010003338A CN 102136262 A CN102136262 A CN 102136262A
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- 230000003139 buffering effect Effects 0.000 abstract 4
- 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
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- 230000005611 electricity Effects 0.000 description 1
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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,, can design a kind of so-called precharge circuit usually in order to promote the quality of demonstration.This precharge meeting makes drive unit (for example source electrode driver) before the picture element gray scale voltage that corresponding video data is produced is provided, and pre-charge pressure of output is to picture element earlier.Thereby make picture element before being driven, to charge, to reduce the reaction time and the current drain of picture element in advance.
In existing drive unit, precharging circuit only provides fixing pre-charge pressure at specific time point, and this can produce the not enough or too much phenomenon of pre-charge pressure under the situation of different gray scale voltages.Below please refer to Figure 1A and Figure 1B, wherein Figure 1A and Figure 1B are respectively the different output signal synoptic diagram of existing drive unit.In the diagram of Figure 1A, drive unit outputs signal to output signal VSO according to the preliminary filling that preliminary filling enable signal PreEn provides voltage quasi position to equal accurate position Veq earlier.And provide drive output signal that voltage quasi position is higher than accurate position Veq with as output signal VSO according to output enable signal SOE.In this case,, and make when drive output signal produces that it is higher also to need the regular hour just can rise to the value and the power consumption of needed gray scale voltage because the voltage quasi position deficiency of preliminary filling output signal can have influence on precharge usefulness.
Opposite, 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 then 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, the gray scale voltage that is produced in order to the foundation video data is adjusted the voltage quasi position of the preliminary filling output signal that produces.
The present invention proposes a kind of drive unit of display, comprises D/A conversion circuit and output buffer.D/A conversion circuit receives the video data of numeral, and according to video data 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 outputs signal to the output terminal of output buffer according to the comparative result and the preliminary filling enable signal of gray scale voltage and output signal so that preliminary filling to be provided.
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 the preliminary filling output signal according to comparative result, wherein is built in the output buffer in the precharging circuit.
In an embodiment of the present invention, above-mentioned output buffer also comprises the 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 an operational amplifier.Operational amplifier has first input end, 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 the 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 a voltage selector.Voltage selector is selected one of them of most voltages to be selected of output according to video data.
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 the video data of numeral, and according to video data 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, produces the preliminary filling output signal according to gray scale voltage and preliminary filling enable 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 the preliminary filling enable signal is activation, produces the preliminary filling output signal according to gray scale voltage.
In an embodiment of the present invention, above-mentioned precharging circuit receives gray scale voltage and preliminary filling enable signal, and when the 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 the video data of numeral, and according to video data 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, produces the output terminal that preliminary filling outputs signal to output buffer according to comparative result and preliminary filling enable signal.
Based on above-mentioned, the gray scale voltage that the present invention produces by the foundation video data is adjusted the voltage swing of its preliminary filling output signal that produces.Make the preliminary filling output signal not can because of be fix and produce the excessive preliminary filling or the situation of preliminary filling deficiency.Except that 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, embodiment cited below particularly, and cooperate appended graphic being described in detail below.
Description of drawings
Figure 1A, Figure 1B are respectively the different output signal synoptic diagram of existing drive unit;
Fig. 2 is the synoptic 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 synoptic 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 invention that Fig. 5 is;
Fig. 6 is the synoptic 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: accurate position.
Embodiment
Please refer to Fig. 2, Fig. 2 is the synoptic diagram of drive unit 200 of the display of one embodiment of the invention.Drive unit 200 comprises D/A conversion circuit 210 and output buffer 220.D/A conversion circuit 210 receives the video data DIN of numeral, and according to video data DIN 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 come construction.Wherein one of them of a plurality of input voltage VIN of voltage selector a plurality of simulations of receiving and selecting according to the video data DIN of numeral to be received is as gray scale voltage VIOP.Being 3 with video data DIN is example, and D/A conversion circuit 210 can receive the foundation that 8 input voltage VIN are used as selecting.
In addition, output buffer 220 can come to compare and produce comparative result with gray scale voltage VIOP when the moment of preliminary filling enable signal PreEn activation according to the drive output signal that is received.Then, output buffer 220 is at the voltage quasi position that decides the preliminary filling output signal that is produced 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.
Below please be simultaneously with reference to Fig. 3 and Fig. 2, Fig. 3 wherein is the enlarged diagram of the output buffer 220 of Fig. 2 embodiment of the present invention.Have precharging circuit 221 in the output buffer 220.Precharging circuit 221 receives preliminary filling enable signal PreEn and receives according to comparing the comparative result that is obtained 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).Precharging circuit 221 provides the preliminary filling output signal with as output signal VSO according to above-mentioned comparative result when the activation of preliminary filling enable signal the time.
Be worth mentioning in addition, output buffer 220 can come construction by operational amplifier.Operational amplifier as output buffer 220 has first input end, 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.(note that as previously mentioned that at this output signal VSO can be drive output signal or preliminary filling output signal, and under precharging state, output signal VSO being a drive output signal).
Then please refer to Fig. 4, Fig. 4 is the synoptic diagram of drive unit 400 of the display of 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 the video data DIN of numeral, and according to video data DIN to produce gray scale voltage VIOP.Wherein, in the present embodiment, D/A conversion circuit 410 utilizes voltage selector to come construction.That is to say that D/A conversion circuit 410 is that one of them of most input voltage VIN selecting to be received according to video data DIN is used as gray scale voltage VIOP.
If gray scale voltage VIOP will more carefully be 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 invention that then please refer to Fig. 5 and be.Wherein output buffer 420 includes utilize transistor M1, M2 to be constituted differential to (differential pair), and transistor M1 and M2 receive gray scale voltage VIOP respectively 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 ends of M2 (the interconnective source/drain of transistor M1, M2 just).
In fact, output buffer 420 can utilize operational amplifier to realize that operational amplifier has first input end, 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 generally include at least one group differential right in the operational amplifier.That is to say that when output buffer 420 is when utilizing amplifier to form, comparative result CMP can directly utilize original just exist differential to producing, and did 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, precharging circuit 430 provides output terminal that preliminary filling outputs signal to output buffer 420 with as output signal VSO according to comparative result.Note that the output enable signal SOE that this moment, output buffer 420 was received is a forbidden energy, therefore, output buffer 420 is kept high impedance (high impendence) at this moment and can not conflicted mutually with the output of precharging circuit 430.
Then, preliminary filling enable signal PreEn transfers forbidden energy to, and output enable signal SOE then transfers activation to.The forbidden energy of the also corresponding enable signal PreEn of precharging circuit 430 and convert high impedance to.Output buffer 420 then corresponding conversion becomes the output enable signal SOE of activation and exports drive output signal with as output signal VSO.
Please pay special attention to, precharging circuit 430 is voltage swings that the preliminary filling output signal that is provided dynamically is provided according to the comparative result CMP of preliminary filling output signal and output signal VSO.That is to say that the drive unit 400 of present embodiment can provide the preliminary filling output signal of the voltage quasi position of more pressing close to required gray scale voltage VIOP, reduce the unnecessary electricity consume.
Below please refer to Fig. 6, Fig. 6 is the synoptic 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 inequality 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 the preliminary filling output signal.
In sum, the gray scale voltage that the present invention directly utilizes the video data of numeral to change, or the comparative result that utilizes gray scale voltage and output signal to compare, make the drive unit (when the preliminary filling enable signal is activation) during preliminary filling of display that the preliminary filling that is close to gray scale voltage output signal is provided.Make the preliminary filling action of display have more usefulness, and can effectively avoid the waste of power.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (17)
1. the drive unit of a display comprises:
One D/A conversion circuit receives a digital video data, and the described video data of foundation is to produce a gray scale voltage; And
One output buffer, couple described D/A conversion circuit, has output terminal to produce an output signal, described output buffer receives described gray scale voltage, a preliminary filling enable signal and described output signal, and outputs signal to the output terminal of described output buffer according to a comparative result and the described preliminary filling enable signal of described gray scale voltage and described output signal so that a preliminary filling to be provided.
2. the drive unit of display according to claim 1, wherein said output buffer comprises:
One precharging circuit is used for receiving described preliminary filling enable signal and described comparative result, and is used for providing described preliminary filling output signal according to described comparative result when described preliminary filling enable signal activation.
3. the drive unit of display according to claim 1, wherein said output buffer also receives an output enable signal, to export the output terminal of a drive output signal to described output buffer according to described output enable signal.
4. the drive unit of display according to claim 3, wherein said output buffer is an operational amplifier, described operational amplifier has first input end, second input end, preliminary filling activation input end and output terminal, its first input end receives described gray scale voltage, its second input end receives described drive output signal, its preliminary filling activation input end receives described preliminary filling enable signal, and its output terminal comprises described drive output signal of generation or described preliminary filling output signal.
5. the drive unit of display according to claim 4, it is one differential right that wherein said operational amplifier includes, described differential right input end is used for receiving described gray scale voltage and described output signal respectively, with more described gray scale voltage and described output signal, produce described comparative result.
6. the drive unit of display according to claim 1, wherein said D/A conversion circuit is a voltage selector, described voltage selector is selected one of them of most voltages to be selected of output according to described video data.
7. the drive unit of a display comprises:
One D/A conversion circuit receives a digital video data, and the described video data of foundation is to produce a gray scale voltage;
One output buffer couples described D/A conversion circuit, is used for receiving described gray scale voltage, and described output buffer has output terminal to produce an output signal; And
One precharging circuit couples described output buffer, produces the output terminal that a preliminary filling outputs signal to described output buffer according to a described gray scale voltage and a preliminary filling enable signal.
8. the drive unit of display according to claim 7, wherein said precharging circuit directly receive described gray scale voltage and when described preliminary filling enable signal is activation, produce described preliminary filling output signal according to described gray scale voltage.
9. the drive unit of display according to claim 7, wherein said precharging circuit receives described gray scale voltage and described preliminary filling enable signal and when described preliminary filling enable signal is activation, according to a comparative result of described gray scale voltage and described output signal to produce described preliminary filling output signal.
10. the drive unit of display according to claim 7, wherein said D/A conversion circuit is a voltage selector, described voltage selector is selected one of them of most voltages to be selected of output according to described video data.
11. the drive unit of display according to claim 7, wherein said output buffer also comprises and receives an output enable signal, described output buffer according to described output enable signal with decision provide a drive output signal to the output terminal of described output buffer whether.
12. the drive unit of display according to claim 11, wherein said output buffer is an operational amplifier, described operational amplifier has first input end, 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.
13. the drive unit of a display comprises:
One D/A conversion circuit receives a digital video data, and the described video data of foundation is to produce a gray scale voltage;
One output buffer, couple described D/A conversion circuit, have output terminal to produce an output signal, described output buffer receives described gray scale voltage and described output signal, and more described gray scale voltage and described output signal, to produce a comparative result; And
One precharging circuit couples described output buffer, produces the output terminal that a preliminary filling outputs signal to described output buffer according to a described comparative result and a preliminary filling enable signal.
14. the drive unit of display according to claim 13, wherein said precharging circuit receive described gray scale voltage and described preliminary filling enable signal and when described preliminary filling enable signal is activation, according to described comparative result to produce described preliminary filling output signal.
15. the drive unit of display according to claim 13, wherein said D/A conversion circuit are a voltage selector, described voltage selector is selected one of them of most voltages to be selected of output according to described video data.
16. the drive unit of display according to claim 13, wherein said output buffer is an operational amplifier, described operational amplifier has first input end, 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.
17. the drive unit of display according to claim 16, it is one differential right that wherein said operational amplifier includes, described differential right input end is used for receiving described gray scale voltage and described output signal respectively, with more described gray scale voltage and described output signal, produce described comparative result.
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102136262A true CN102136262A (en) | 2011-07-27 |
| CN102136262B CN102136262B (en) | 2014-07-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010003338.4A Expired - Fee Related CN102136262B (en) | 2010-01-21 | 2010-01-21 | Display actuating device |
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| Country | Link |
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| CN (1) | CN102136262B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111968591A (en) * | 2016-08-10 | 2020-11-20 | 联咏科技股份有限公司 | Control method and control device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005017536A (en) * | 2003-06-24 | 2005-01-20 | Nec Yamagata Ltd | Display control circuit |
| CN101221714B (en) * | 2007-01-12 | 2010-09-29 | 联詠科技股份有限公司 | Driving device |
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2010
- 2010-01-21 CN CN201010003338.4A patent/CN102136262B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111968591A (en) * | 2016-08-10 | 2020-11-20 | 联咏科技股份有限公司 | Control method and control device |
| USRE49356E1 (en) | 2016-08-10 | 2023-01-03 | Novatek Microelectronics Corp. | Control method and control device for charging time sharing |
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| Publication number | Publication date |
|---|---|
| CN102136262B (en) | 2014-07-23 |
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