CN103778880A - Display driving device - Google Patents
Display driving device Download PDFInfo
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- CN103778880A CN103778880A CN201410009990.5A CN201410009990A CN103778880A CN 103778880 A CN103778880 A CN 103778880A CN 201410009990 A CN201410009990 A CN 201410009990A CN 103778880 A CN103778880 A CN 103778880A
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- preliminary filling
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Abstract
The invention provides a display driving device comprising a digital-to-analog conversion circuit and an output buffering circuit. The digital-to-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 pre-charging enabled signal and an output signal, and supplies a pre-charging output signal to the output end of the output buffering circuit according to a result of comparison between the gray-scale voltage and the output signal and the pre-charging 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) providing before the corresponding demonstration of the pixel gray scale voltage that data produce, and first exports a pre-charge pressure to pixel.Thereby pixel can be charged in advance before by driving, to reduce reaction time and the current drain of pixel.
In existing drive unit, precharging circuit only provides fixing pre-charge pressure at specific time point, and this can produce pre-charge pressure deficiency or too much phenomenon in the case 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 schematic diagram of existing drive unit.In the diagram of Figure 1A, the preliminary filling that drive unit first provides voltage level to equal level Veq according to preliminary filling enable signal PreEn outputs signal to output signal VSO.And according to output enable signal SOE provide voltage level higher than the drive output signal of level Veq using as output signal VSO.In this case, due to the voltage level deficiency of preliminary filling output signal, 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 level Veq of preliminary filling output signal is far above the voltage level 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, adjust the voltage level of produced preliminary filling output signal in order to the gray scale voltage producing according to demonstration data.
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 in the time of 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, produces preliminary filling output signal according to gray scale voltage and preliminary filling enable signal.Precharging circuit also transmits preliminary filling and outputs signal to the output terminal of output buffer.
In an embodiment of the present invention, above-mentioned precharging circuit directly receives gray scale voltage and in the time that preliminary filling enable signal is activation, produces 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 in the time that 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, produces preliminary filling and output signal to the output terminal of output buffer according to comparative result and preliminary filling enable signal.
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 accompanying drawing to be described in detail below.
Accompanying drawing explanation
Figure 1A and Figure 1B are respectively the different output signal schematic diagram of existing drive unit;
Fig. 2 is the schematic diagram of the 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 the drive unit 400 of the display of another embodiment of the present invention;
Fig. 5 is the enlarged diagram of the output buffer 420 of the embodiment of the present invention;
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;
DIN: show data.
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 selects one of them of multiple input voltage VIN of received multiple simulations as gray scale voltage VIOP according to digital demonstration data DIN.To show that data DIN is as 3 as example, D/A conversion circuit 210 can receive 8 input voltage VIN and be used as the foundation of selecting.
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 level of produced preliminary filling output signal according to this comparative result.So, the voltage level 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 level of preliminary filling output signal.
Referring to Fig. 3 and Fig. 2, wherein Fig. 3 is 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 by gray scale voltage VIOP and drive output signal (at the state of this precharging state preliminary filling enable signal PreEn activation), and drive output signal is output signal VSO) compare obtained comparative result.When the activation of preliminary filling enable signal, precharging circuit 221 provides preliminary filling output signal 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.There is first input end, the second input end, preliminary filling activation input end and output terminal as the operational amplifier of output buffer 220.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 at this, 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.
If gray scale voltage VIOP and the comparison as the output signal VSO of drive output signal will be more carefully described, please refer to Fig. 5, the enlarged diagram of the output buffer 420 that Fig. 5 is the embodiment of the present invention.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 the output signal VSO as drive output signal.So the differential right common end (the namely interconnective source/drain electrode of transistor M1, M2) that, comparative result CMP just can form at transistor M1 and M2 produces.
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.In the time of preliminary filling enable signal PreEn activation, precharging circuit 430 provides output terminal that preliminary filling outputs signal to output buffer 420 using as output signal VSO according to comparative result.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 preliminary filling 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 using as output signal VSO.
Please pay special attention to, precharging circuit 430 is voltage swings that 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 level 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 the foundations that directly receive gray scale voltage VIOP and be 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 (16)
1. a drive unit for display, is characterized in that, 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; And
One output buffer, couple described D/A conversion circuit, there is 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 according to a comparative result of described gray scale voltage and described output signal and described preliminary filling enable signal to provide a preliminary filling to output signal to the output terminal of described output buffer.
2. the drive unit of display according to claim 1, is characterized in that, described output buffer comprises:
One precharging circuit, is used for receiving described preliminary filling enable signal and described comparative result, and is used in the time of described preliminary filling enable signal activation, provides described preliminary filling output signal according to described comparative result.
3. the drive unit of display according to claim 1, is characterized in that, described 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, it is characterized in that, described output buffer is an operational amplifier, described operational amplifier has first input end, the 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, and its preliminary filling activation input end receives described preliminary filling enable signal, and its output terminal comprises the described drive output signal of generation or described preliminary filling output signal.
5. the drive unit of display according to claim 4, it is characterized in that, it is one differential right that described 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 comparative result.
6. the drive unit of display according to claim 1, is characterized in that, described D/A conversion circuit is a voltage selector, and described voltage selector is exported one of them of most voltages to be selected according to described demonstration data selection.
7. a drive unit for display, is characterized in that, 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, 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 a preliminary filling and output signal to the output terminal of described output buffer according to described gray scale voltage and a preliminary filling enable signal.
8. the drive unit of display according to claim 7, is characterized in that, described precharging circuit directly receives described gray scale voltage and in the time that described preliminary filling enable signal is activation, produces described preliminary filling output signal according to described gray scale voltage.
9. the drive unit of display according to claim 7, it is characterized in that, described precharging circuit receives described gray scale voltage and described preliminary filling enable signal and in the time that 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, is characterized in that, described D/A conversion circuit is a voltage selector, and described voltage selector is exported one of them of most voltages to be selected according to described demonstration data selection.
The drive unit of 11. displays according to claim 7, it is characterized in that, described output buffer also comprises and receives an output enable signal, described output buffer according to described output enable signal with determine to provide a drive output signal to the output terminal of described output buffer whether.
The drive unit of 12. displays according to claim 11, it is characterized in that, described 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.
The drive unit of 13. 1 kinds of displays, is characterized in that, 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, couples described output buffer, produces a preliminary filling and output signal to the output terminal of described output buffer according to a preliminary filling enable signal and described gray scale voltage.
The drive unit of 14. displays according to claim 13, is characterized in that, described D/A conversion circuit is a voltage selector, and described voltage selector is exported one of them of most voltages to be selected according to described demonstration data selection.
The drive unit of 15. displays according to claim 13, it is characterized in that, described 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.
The drive unit of 16. displays according to claim 15, it is characterized in that, it is one differential right that described 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 (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410009990.5A CN103778880B (en) | 2010-01-21 | 2010-01-21 | The driving means of display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410009990.5A CN103778880B (en) | 2010-01-21 | 2010-01-21 | The driving means of display |
| CN201010003338.4A CN102136262B (en) | 2010-01-21 | 2010-01-21 | Display actuating device |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010003338.4A Division CN102136262B (en) | 2010-01-21 | 2010-01-21 | Display actuating device |
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| CN103778880A true CN103778880A (en) | 2014-05-07 |
| CN103778880B CN103778880B (en) | 2016-08-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113053279A (en) * | 2019-12-26 | 2021-06-29 | 联咏科技股份有限公司 | Driving circuit of display device and related driving method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113053279A (en) * | 2019-12-26 | 2021-06-29 | 联咏科技股份有限公司 | Driving circuit of display device and related driving method |
| CN113053279B (en) * | 2019-12-26 | 2024-02-09 | 联咏科技股份有限公司 | Driving circuit of display device and related driving method |
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| CN103778880B (en) | 2016-08-17 |
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