CN103544913B - Driving voltage maker and digital to analog converter thereof - Google Patents
Driving voltage maker and digital to analog converter thereof Download PDFInfo
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- CN103544913B CN103544913B CN201210245679.1A CN201210245679A CN103544913B CN 103544913 B CN103544913 B CN 103544913B CN 201210245679 A CN201210245679 A CN 201210245679A CN 103544913 B CN103544913 B CN 103544913B
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Abstract
The invention provides a kind of driving voltage maker and digital to analog converter thereof, comprise voltage selector, a M voltage transmits switch and selects signal decoder.Voltage selector receives N number of first voltage in multiple input voltages of analog format, and receives multiple selection signals of digital format.Voltage selector according to select signal behavior first voltage maximum one of them to be provided to output terminal.One end of voltage transmission switch receives M the second voltage of non-first voltage in input voltage respectively.Voltage transmits switch and transmits enable signal to be turned on or off according to M respectively.Select signal decoder to produce transmission enable signal according to selecting signal, wherein, M and N is all positive integer.
Description
Technical field
The invention relates to a kind of driving voltage maker and digital to analog converter thereof.
Background technology
In a display device, in order to present the image of correct grey decision-making on a display panel, the source electrode driver of display device needs to provide correct gamma voltage on display panel according to display panel luma data to display.Therefore, on the source electrode driver of display device, need to use digital to analog converter to carry out the luma data of foundation digital format to produce the driver output voltage of analog format, and drive display panel to carry out the display of picture by driver output voltage.
Please refer to Fig. 1, Fig. 1 is the circuit diagram of the digital to analog converter 100 of prior art.Digital to analog converter 100 comprises the switch that multiple transistor MP1 ~ transistor MP7 is formed.Wherein, the switch that transistor MP1 ~ transistor MP7 is formed is divided into three grades, transistor MP1 ~ transistor the MP4 being arranged in the first order receives four gamma input voltage VP [n] ~ gamma input voltage VP [n+3] respectively, and, transistor MP1, transistor MP3 and transistor MP2, transistor MP4 are controlled by selection signal SEL [n] respectively and select signal SELB [n], wherein, signal SELB [n] is selected to be the reverse signal selecting signal SEL [n].In addition, be arranged in the transistor MP5 of the second level and transistor MP6 respectively receiving crystal pipe MP1 and transistor MP2 jointly couple the voltage that the voltage of end points and transistor MP3 and transistor MP4 couple end points jointly.Transistor MP5 and transistor MP6 is then controlled by selection signal SEL [n+1] respectively and selects signal SELB [n+1] to be turned on or off.Transistor MP7 then couples end points jointly to transistor MP5 and transistor MP6, it is controlled by selects signal SELB [n+2] to be turned on or off, and determines that the voltage whether providing transistor MP5 and transistor MP6 jointly to couple end points is using as driver output voltage VOUTP.
Can be known by Fig. 1 and learn, any one gamma input voltage VP [n] wherein ~ gamma input voltage VP [n+3] is transmitted need through three transistor switches as driver output voltage VOUTP.That is, in existing digital to analog converter 100, gamma input voltage transmits using between the transmission path as driver output voltage VOUTP, has certain transmission resistance.This transmission resistance will be larger when the number of gamma input voltage is more, even can have influence on the quality of driver output voltage VOUTP.In addition, the digital to analog converter 100 of prior art, when the number of bits of its conversion is more, required transistor switch also can increase thereupon, significantly increases required circuit area.
Summary of the invention
The invention provides a kind of digital to analog converter, effectively reduce the conducting resistance between input voltage and output voltage, and reduce the area of circuit layout.
The invention provides a kind of driving voltage maker, effectively reduce the conducting resistance between input voltage and output voltage in its digital to analog converter, and reduce the area of circuit layout.
The present invention proposes a kind of digital to analog converter, comprises voltage selector, a M voltage transmits switch and selects signal decoder.Voltage selector receives N number of first voltage in multiple input voltages of analog format, and receives multiple selection signals of digital format.Voltage selector according to select signal behavior first voltage maximum one of them to be provided to output terminal.One end of voltage transmission switch receives M the second voltage of non-first voltage in input voltage respectively.The other end that voltage transmits switch is connected to output terminal jointly.Voltage transmits switch and transmits enable signal to be turned on or off according to M respectively.Select signal decoder to couple voltage and transmit switch, to produce transmission enable signal according to selection signal, wherein, M and N is all positive integer.
In one embodiment of this invention, above-mentioned voltage transmits a switch conducting according to transmission enable signal at the most.
In one embodiment of this invention, when above-mentioned voltage selector selects the first voltage one of them to be provided to output terminal time, voltage transmits switch and is all disconnected.
In one embodiment of this invention, when non-selected first voltage of above-mentioned voltage selector arbitrary is to be provided to output terminal, voltage transmit switch one of them be switched on.
The present invention also proposes a kind of driving voltage maker, is applicable to display device.Driving voltage maker comprises the first digital to analog converter, and the first digital to analog converter comprises the first voltage selector, M the first voltage transmits switch and first and selects signal decoder.First voltage selector receives N number of first voltage in multiple first gamma input voltages of analog format, and receives multiple first selection signals of digital format.First voltage selector according to first select signal behavior first voltage maximum one of them to be provided to the first output terminal.One end of first voltage transmission switch receives M the second voltage of non-first voltage in the first gamma input voltage respectively, and the other end that the first voltage transmits switch is connected to the first output terminal jointly.First voltage transmits switch and transmits enable signal to be turned on or off according to M individual first respectively.First selects signal decoder to couple the first voltage transmits switch, and to select signal to produce the first transmission enable signal according to first, wherein, M and N is all positive integer.
In one embodiment of this invention, driving voltage maker also comprises the second digital to analog converter.Second digital analog converter then comprises the second voltage selector, second voltage transmits switch and second and selects signal decoder.Second voltage selector receives the N number of tertiary voltage in multiple second gamma input voltages of analog format, and receives multiple second selection signals of digital format.Second voltage selector according to second select signal behavior tertiary voltage maximum one of them to be provided to the second output terminal.One end of second voltage transmission switch receives M the 4th voltage of non-second voltage in the second gamma input voltage respectively.The other end that second voltage transmits switch is connected to the second output terminal jointly, and the second voltage transmits switch and transmits enable signal to be turned on or off according to M individual second respectively.Second selects signal decoder to couple the second voltage transmits switch, to select signal to produce the second transmission enable signal according to second.
In one embodiment of this invention, driving voltage maker also comprises gamma input voltage maker.Gamma input voltage maker couples the first and second digital to analog converter, in order to produce first and second gamma input voltage.
In one embodiment of this invention, driving voltage maker also comprises driving voltage output buffer.Driving voltage output buffer storage is coupled to first and second output terminal, and driving voltage output buffer storage carrys out voltage on selection gist first or second output terminal to produce driver output voltage according to polarity selection signal.
Based on above-mentioned, the present invention is in digital to analog converter, thering is provided one or more voltage to transmit switch, and the transmission enable signal by selecting signal decoder to produce, voltage being transmitted the output terminal that input voltage that switch receives directly transfers to digital to analog converter.Thus, the input voltage that voltage transmission switch receives can not be selected by the voltage selector with complicated circuit construction to export, and the time that can need, directly transmit by voltage the output terminal that switch is sent to digital to analog converter, effectively reduce input voltage be sent to output terminal by the resistance value in path.In addition, transmit by simple voltage the transmission that switch carries out input voltage, also can effectively reduce the layout area of circuit.The present invention also proposes the driving voltage maker being used in display device utilizing above-mentioned digital to analog converter institute construction, to provide gamma input voltage more accurately to come as driver output voltage, enters to promote display usefulness.
For 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
Fig. 1 is the circuit diagram of the digital to analog converter 100 of prior art;
Fig. 2 is the schematic diagram of a digital to analog converter 200 of the embodiment of the present invention;
Fig. 3 is the schematic diagram of the digital to analog converter 300 of another embodiment of the present invention;
Fig. 4 is the schematic diagram of the driving voltage maker 400 of one embodiment of the invention.
Description of reference numerals:
100,200,300,421,422: digital to analog converter;
210,310: voltage selector;
221 ~ 22M, 321 ~ 32M: voltage transmits switch;
230,330: select signal decoder;
400: driving voltage maker;
410: gamma input voltage maker;
430: driving voltage exports buffer;
VP1 ~ VPP, VN1 ~ VNP: gamma input voltage;
VP [n] ~ VP [n+M-4], VN [n] ~ VN [n+M-4]: input voltage;
SEL [n] ~ SEL [n+2], SELB [n] ~ SELB [n+2], SEL, SELB: select signal;
OUT1, OUT2: output terminal;
MP21 ~ MP28, MN21 ~ MN28, MP1 ~ MP7: transistor;
V1, V2: voltage;
HB [n] ~ HB [n+M-4], H [n] ~ H [n+M-4]: enable signal;
VOUTP, VDRV: driver output voltage;
VOUT1, VOUT2: output voltage;
POL: polarity selection signal.
Embodiment
Please refer to Fig. 2, Fig. 2 is the schematic diagram of a digital to analog converter 200 of the embodiment of the present invention.Digital to analog converter 200 comprises voltage selector 210, voltage transmits switch 221 ~ voltage and transmits switch 22M and select signal decoder 230.Voltage selector 210 receives input voltage VP [the n] ~ input voltage VP [n+2] in multiple input voltage VP [the n] ~ input voltage VP [n+M-4] of analog format, and receives multiple selection signal SEL [n] ~ selection signal SEL [n+2] of digital format and select signal SELB [n] ~ selection signal SELB [n+2].Wherein, signal SELB [n] ~ selection signal SELB [n+2] is selected to be respectively the reverse signal selecting signal SEL [n] ~ selection signal SEL [n+2].Voltage selector according to select signal SEL [n] ~ select signal SEL [n+2], select signal SELB [n] ~ select signal SELB [n+2] select input voltage VP [n] ~ input voltage VP [n+2] maximum one of them to be provided to output terminal OUT1.
In the present embodiment, voltage selector 210 comprises the switch that multiple transistor MP21 ~ transistor MP26 is formed.Wherein, transistor MP21 and transistor MP22 is used for selecting input voltage VP [n] and one of them of input voltage VP [n+1] to transfer to one end of transistor MP24.Transistor MP21 is controlled by selection signal SELB [n] to be turned on or off, and transistor MP22 is then controlled by selection signal SEL [n] to be turned on or off.In addition, transistor MP23 receives input voltage VP [n+2] and is controlled by and selects signal SELB [n].That is, when transistor MP21 and transistor MP22 transmits input voltage VP [n] to transistor MP24 according to selection signal SEL [n] and selection signal SELB [n] (input voltage VP [n] equals voltage V1), transistor MP23 is switched on simultaneously, and transmits one end (input voltage VP [n+2] equals voltage V2) of input voltage VP [n+2] to transistor MP25.Relative, when transistor MP21 and transistor MP22 transmits input voltage VP [n+1] to transistor MP24 according to selection signal SEL [n] and selection signal SELB [n] (input voltage VP [n+1] equals voltage V1), transistor MP23 is disconnected simultaneously, and the end points that transistor MP23 and transistor MP25 is coupled is suspension joint (floating) state (voltage V2 is high impedance).
Transistor MP24 and transistor MP25 be controlled by respectively select signal SELB [n+1] and select signal SEL [n+1] be used for selecting voltage V1 and voltage V2 one of them to input to transistor MP26.Transistor M26 is then controlled by and selects signal SELB [n+2] and be turned on or off, and determines whether one of them of voltage V1 and voltage V2 to be transferred to output terminal OUT1 using as output voltage.
In addition, in the present embodiment, voltage transmits switch 221 ~ voltage and transmits switch 22M respectively by transistor MP27 ~ transistor MP28 institute construction.Transistor MP27 ~ transistor MP28 is controlled by transmission enable signal HB [n] ~ enable signal HB [n+M-4] respectively to be turned on or off.It should be noted that in transistor MP27 ~ transistor MP28, a meeting is switched at the most, and one of them of direct its input voltage VP [n+3] received ~ input voltage VP [n+M-4] of transmission is to output terminal OUT1.Further, the state that the transistor MP26 now in voltage selector 210 is off.Above-mentioned n and M is all positive integer.
Certainly, transistor MP27 ~ transistor MP28 also may all disconnect, and make voltage transmission switch 221 ~ voltage transmission switch 22M not transmit any voltage to output terminal OUT1, and under this condition, the transistor MP26 in voltage selector 210 then must for the state of conducting and transfer transistor MP24 and transistor MP25 phase couple voltage on end points to output terminal OUT1.
Please note, can be learnt by above-mentioned explanation, the input voltage VP [n+3] in the present embodiment ~ input voltage VP [n+M-4] can transmit switch 221 ~ voltage transmission switch 22M by the voltage of single transistor MP27 ~ transistor MP28 institute construction and be sent to output terminal OUT1.That is, digital to analog converter 200 transmits input voltage VP [n+3] ~ input voltage VP [n+M-4] one of them be used as output voltage time, the transfer impedance had is very little.If digital to analog converter 200 is under operation at a high speed, input voltage VP [the n+3] ~ input voltage VP [n+M-4] supposing to have relatively large absolute value of voltage is efficiently transmitted over a channel and just can be effectively shortened to the time delay required for output terminal OUT1.That is, the output voltage that digital to analog converter 200 produces can be more accurate.
Select signal decoder 230 to be coupled to voltage and transmit switch 221 ~ voltage transmission switch 22M, and reception selection signal SEL [n] ~ select signal SEL [n+2].Select signal decoder 230 can produce according to selection signal SEL [n] ~ selection signal SEL [n+2] and/or its reverse signal SELB [n] ~ reverse signal SELB [n+2] and transmit enable signal HB [n] ~ enable signal HB [n+M-4].Select signal decoder 230 can carry out construction by logical operation circuit, for example, under the transistor MP21 ~ transistor MP28 of the present embodiment is all the condition of P-type crystal pipe, when digital to analog converter 200 according to select signal SEL [n] ~ select signal SEL [n+2] to transmit input voltage VP [n+3] ~ input voltage VP [n+M-4] one of them to output terminal OUT1 time, one of them selecting signal decoder 230 to make transmission enable signal HB [n] ~ enable signal HB [n+M-4] equals logic low potential signal, remaining transmits enable signal and then equals logic high potential signal.
Below please refer to Fig. 3, Fig. 3 is the schematic diagram of the digital to analog converter 300 of another embodiment of the present invention.Digital to analog converter 300 comprises voltage selector 310, voltage transmits switch 321 ~ voltage and transmits switch 32M and select signal decoder 330.Voltage selector 310 receives voltage VN [the n] ~ VN [n+2] in multiple input voltage VN [the n] ~ input voltage VN [n+M-4] of analog format, and receives multiple selection signal SEL [n] ~ selection signal SEL [n+2] of digital format and select signal SELB [n] ~ selection signal SELB [n+2].Wherein, signal SELB [n] ~ selection signal SELB [n+2] is selected to be respectively the reverse signal selecting signal SEL [n] ~ selection signal SEL [n+2].Voltage selector 310 according to select signal SEL [n] ~ select signal SEL [n+2], select signal SELB [n] ~ select signal SELB [n+2] select voltage VN [n] ~ voltage VN [n+2] maximum one of them to be provided to output terminal OUT2.One end of voltage transmission switch 321 ~ voltage transmission switch 32M receives voltage VN [the n+3] ~ voltage VN [n+M-4] in input voltage VN [n] ~ input voltage VN [n+M-4] respectively.The other end that voltage transmits switch 321 ~ voltage transmission switch 32M is connected to output terminal OUT2 jointly.Voltage transmits switch 321 ~ voltage and transmits switch 32M respectively according to transmitting enable signal H [n] ~ enable signal H [n+M-4] to be turned on or off.
Not identical with the embodiment of Fig. 2, the switch of the present embodiment all utilizes N-type transistor to carry out construction, and therefore, the controlled signal of transistor MN21 ~ transistor MN28 is wherein all the reverse of the transistor MP21 ~ transistor MP28 of the embodiment of Fig. 2.And about the action details of the present embodiment, similar with the embodiment shown in Fig. 2, seldom repeat below.
Below please refer to Fig. 4, Fig. 4 is the schematic diagram of the driving voltage maker 400 of one embodiment of the invention.Driving voltage maker 400 is applicable to display device, is such as liquid crystal display or light emitting diode indicator etc. in the display device of this indication.With display device as liquid crystal display is for example, driving voltage maker 400 comprises gamma input voltage maker 410, digital to analog converter 421 and 422 and driving voltage output buffer storage 430.Gamma input voltage maker 410 couples mutually with digital to analog converter 421,422, in order to produce gamma input voltage VP1 ~ VPP and VN1 ~ VNP.Digital to analog converter 421,422 receives gamma input voltage VP1 ~ VPP and VN1 ~ VNP respectively and selects signal SEL, SELB, and produces output voltage VO UT1 and VOUT2 to driving voltage output buffer 430 by its output terminal.Driving voltage exports buffer 430 and is coupled to the output terminal of digital to analog converter 421,422, and carrys out voltage on the output terminal of selection gist digital to analog converter 421,422 to produce driver output voltage VDRV according to polarity selection signal POL.
Please note at this, about digital to analog converter 421, the implementation detail of digital to analog converter 422, wherein, digital to analog converter 421 can utilize the digital to analog converter 200 of embodiment as shown in Figure 2 to carry out construction, digital to analog converter 422 then can utilize the digital to analog converter 300 of embodiment as shown in Figure 3 to carry out construction, wherein, digital-to-analogue parallel operation 421 is used for selecting positive gamma input voltage VP1 ~ gamma input voltage VPP to produce output voltage VO UT1, digital to analog converter 422 is then used for selecting negative gamma input voltage VN1 ~ gamma input voltage VNP to produce output voltage VO UT2.
In addition, select signal SEL, select signal SELB can produce according to the luma data of display device image to display.As a rule, each is selected signal SEL, selects signal SELB to make digital to analog converter 421, a digital to analog converter 422 corresponding generation output voltage VO UT1 and VOUT2 respectively, wherein, selects signal SEL and selects signal SELB reverse signal each other.
At this, digital to analog converter 421, digital to analog converter 422 are all not necessary, if be applied in driving voltage maker 400 not tool drive polarity such as light emitting diode indicator on time, digital to analog converter 421, digital to analog converter 422 can select a use for the voltage of driver output voltage is positive and negative, certainly, with this understanding, driving voltage output buffer storage 430 selects signal POL without the need to receiving polarity, and only needs the driving force strengthening output voltage VO UT1 or output voltage VO UT2 to produce driver output voltage VDRV.
In sum, the present invention, by outside the voltage selector of digital to analog converter, separately arranges voltage and transmits switch.And setting makes the portion voltage in input voltage be sent to the output terminal at digital to analog converter by voltage transmission switch.So, these are coupled to voltage and transmit the input voltage of switch when carrying out voltage and transmitting, and not needing the voltage transmission route through having high impedance, can be transferred into output terminal faster, to accelerate the voltage conversion efficiency of digital to analog converter.In addition, transmitted the configuration of switch by simple voltage, effectively can also reduce the area of circuit, save cost.Subsidiary one carries, digital to analog converter proposed by the invention can be applicable on the driving voltage maker of display device, under the state that display frame has high picture update rate, effectively can promote it and show usefulness and the quantity reducing circuit component, take into account the lifting of product quality and price competitiveness.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (11)
1. a digital to analog converter, is characterized in that, comprising:
One voltage selector, receive N number of first voltage in multiple input voltages of analog format, and receive multiple selection signals of digital format, this voltage selector according to those select signal behavior those the first voltages maximum one of them to be provided to an output terminal;
M voltage transmits switch, one end of those voltage transmission switch receives M the second voltage of those the first voltages non-in those input voltages respectively, the other end that those voltage transmits switch is connected to this output terminal jointly, and those voltage transmits switch and transmits enable signal to be turned on or off according to M respectively; And
One selects signal decoder, couples those voltage and transmits switch, selects signal to produce those transmit enable signal according to those,
Wherein, M and N is all positive integer.
2. digital to analog converter according to claim 1, is characterized in that, those voltage transmits a switch conducting according to those transmission enable signals at the most.
3. digital to analog converter according to claim 2, is characterized in that, when this voltage selector selects those the first voltages one of them to be provided to this output terminal time, those voltage transmits switch and is all disconnected.
4. digital to analog converter according to claim 2, is characterized in that, when this voltage selector those the first voltages non-selected arbitrary is to be provided to this output terminal, those voltage transmit switch one of them be switched on.
5. a driving voltage maker, is applicable to a display device, it is characterized in that, comprising:
One first digital to analog converter, comprising:
One first voltage selector, receive N number of first voltage in multiple first gamma input voltages of analog format, and receive multiple first of digital format and select signals, this first voltage selector according to those first select signal behavior those the first voltages maximum one of them to be provided to one first output terminal;
M the first voltage transmits switch, one end of those first voltage transmission switch receives M the second voltage of those the first voltages non-in those the first gamma input voltages respectively, the other end that those first voltage transmits switch is connected to this first output terminal jointly, and those first voltage transmits switch and transmits enable signal to be turned on or off according to M individual first respectively; And
One first selects signal decoder, couples those first voltage and transmits switch, and produce those the first transmission enable signals according to those the first selection signals, wherein, M and N is all positive integer.
6. driving voltage maker according to claim 5, is characterized in that, also comprise:
One second digital to analog converter, comprising:
One second voltage selector, receive the N number of tertiary voltage in multiple second gamma input voltages of analog format, and receive multiple second of digital format and select signals, this second voltage selector according to those second select signal behavior those tertiary voltages maximum one of them to be provided to one second output terminal;
M the second voltage transmits switch, one end of those second voltage transmission switch receives M the 4th voltage of those tertiary voltages non-in those the second gamma input voltages respectively, the other end that those second voltage transmits switch is connected to this second output terminal jointly, and those second voltage transmits switch and transmits enable signal to be turned on or off according to M individual second respectively; And
One second selects signal decoder, couples those second voltage and transmits switch, produces those the second transmission enable signals according to those the second selection signals.
7. driving voltage maker according to claim 6, is characterized in that, also comprise:
One gamma input voltage maker, couple this first and this second digital to analog converter, in order to produce those first and those the second gamma input voltages.
8. driving voltage maker according to claim 6, is characterized in that, also comprise:
One driving voltage exports buffer, be coupled to this first and this second output terminal, this driving voltage export buffer according to a polarity selection signal come selection gist this first or this second output terminal on voltage to produce a driver output voltage.
9. driving voltage maker according to claim 6, it is characterized in that, those first voltage transmits a switch conducting according to those first transmission enable signals at the most, and those second voltage transmits a switch conducting according to those second transmission enable signals at the most.
10. driving voltage maker according to claim 9, it is characterized in that, when this first voltage selector selects those the first voltages one of them to be provided to this first output terminal time, those first voltage transmits switch and is all disconnected, when this second voltage selector selects those tertiary voltages one of them to be provided to this second output terminal time, those second voltage transmits switch and is all disconnected.
11. driving voltage makers according to claim 9, it is characterized in that, when this first voltage selector those the first voltages non-selected arbitrary is to be provided to this first output terminal, one of them of those first voltage transmission switch is switched on, when this second voltage selector those tertiary voltages non-selected arbitrary is to be provided to this second output terminal, those second voltage transmit switch one of them be switched on.
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| CN108551345A (en) * | 2018-04-19 | 2018-09-18 | 南通大学 | A kind of multichannel single choice type D/A converter |
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| US20040150607A1 (en) * | 1998-12-21 | 2004-08-05 | Yoshiharu Nakajima | Digital/analog converter circuit, level shift circuit, shift register utilizing level shift circuit, sampling latch circuit, latch circuit and liquid crystal display device incorporating the same |
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