CN103544913A - Driving voltage generator and digital-to-analog converter thereof - Google Patents
Driving voltage generator and digital-to-analog converter thereof Download PDFInfo
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- CN103544913A CN103544913A CN201210245679.1A CN201210245679A CN103544913A CN 103544913 A CN103544913 A CN 103544913A CN 201210245679 A CN201210245679 A CN 201210245679A CN 103544913 A CN103544913 A CN 103544913A
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Abstract
The invention provides a driving voltage generator and a digital-to-analog converter thereof. The driving voltage generator comprises a voltage selector, M voltage transmission switches and a selective signal decoder. The voltage selector receives N first voltages in multiple input voltages in analog format, receives multiple selective signals in digital format, and selects at most one of the first voltages to provide the same to the output end according to the selective signals. One ends of the voltage transmission switches receive M second voltages which are not the first voltages in the input voltages respectively. The voltage transmission switches are connected or disconnected according to M transmission enable signals. The selective signal decoder can generate the transmission enable signals according to the selective signals. Both the M and the N are positive integers.
Description
Technical field
The invention relates to a kind of driving voltage maker and digital to analog converter thereof.
Background technology
In display device, in order to present the image of correct GTG value on display panel, the source electrode driver of display device need to provide correct gamma voltage to display panel according to display panel luma data to display.Therefore, on the source electrode driver of display device, need to carry out producing according to the luma data of digital format with digital to analog converter the driver output voltage of analog format, and drive display panel to carry out the demonstration of picture by driver output voltage.
Please refer to Fig. 1, the circuit diagram of the digital to analog converter 100 that Fig. 1 is prior art.Digital to analog converter 100 comprises the switch that a plurality of transistor MP1～transistor MP11 form.Wherein, the switch that transistor MP1～transistor MP7 forms is divided into three grades, transistor MP1～transistor the MP4 that is arranged in the first order receives respectively four gamma input voltage VP[n]～gamma input voltage VP[n+3], and, transistor MP1, transistor MP3 and transistor MP2, transistor MP4 are controlled by respectively selection signal SEL[n] and select signal SELB[n], wherein, select signal SELB[n] for selecting signal SEL[n] reverse signal.In addition receiving crystal pipe MP1 and transistor MP2 couple the voltage that the voltage of end points and transistor MP3 and transistor MP4 couple end points jointly jointly respectively, to be arranged in the transistor MP5 of the second level and transistor MP6.Transistor MP5 and transistor MP6 are controlled by respectively selection signal SEL[n+1] and select signal SELB[n+1] with conducting or disconnection.Transistor MP7 couples end points jointly to transistor MP5 and transistor MP6, it is controlled by selects signal SELB[n+2] with conducting or disconnection, and the voltage whether decision provides transistor MP5 and transistor MP6 jointly to couple end points is usingd as driver output voltage VOUTP.
By Fig. 1, can know and learn, any gamma input voltage VP[n wherein]～gamma input voltage VP[n+3] be transmitted to using and all need through three transistor switches as driver output voltage VOUTP.That is to say, in existing digital to analog converter 100, between the transmission path that the transmission of gamma input voltage is usingd as driver output voltage VOUTP, to there is 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, needed 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 that voltage selector, a M voltage transmit switch and selects signal decoder.Voltage selector receives N the first voltage in a plurality of input voltages of analog format, and receives a plurality of selection signals of digital format.Voltage selector according to select signal select the first voltage maximum one of them to provide to output terminal.One end of voltage transmission switch receives respectively M second voltage of non-the first voltage in input voltage.The other end that voltage transmits switch is connected to output terminal jointly.Voltage transmits switch and according to M, transmits enable signal with conducting or disconnection respectively.Select signal decoder to couple voltage and transmit switch, to produce transmission enable signal according to selection signal, wherein, M and N are all positive integer.
In one embodiment of this invention, above-mentioned voltage transmits a switch conducting according to transmitting enable signal at the most.
In one embodiment of this invention, one of them that select the first voltage when above-mentioned voltage selector is when providing to output terminal, and voltage transmits switch and is all disconnected.
In one embodiment of this invention, arbitrary when providing to output terminal when non-selected the first voltage of above-mentioned voltage selector, 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 that the first voltage selector, M the first voltage transmit switch and first and selects signal decoder.The first voltage selector receives N the first voltage in a plurality of first gamma input voltages of analog format, and receives a plurality of first of digital format and select signals.The first voltage selector according to first select signal select the first voltage maximum one of them to provide to the first output terminal.One end of the first voltage transmission switch receives respectively M second voltage of non-the first voltage in the first gamma input voltage, and the other end that the first voltage transmits switch is connected to the first output terminal jointly.The first voltage transmits switch and according to M individual first, transmits enable signal with conducting or disconnection respectively.First selects signal decoder to couple the first voltage transmits switch, and to produce the first transmission enable signal according to the first selection signal, wherein, M and N are all positive integer.
In one embodiment of this invention, driving voltage maker also comprises the second digital to analog converter.The second digital analog converter comprises that second voltage selector switch, second voltage transmit switch and second and selects signal decoder.Second voltage selector switch receives N tertiary voltage in a plurality of second gamma input voltages of analog format, and receives a plurality of second selection signals of digital format.Second voltage selector switch according to second select signal select tertiary voltage maximum one of them to provide to the second output terminal.One end of second voltage transmission switch receives respectively M the 4th voltage of non-second voltage in the second gamma input voltage.The other end that second voltage transmits switch is connected to the second output terminal jointly, and second voltage transmits switch and according to M individual second, transmits enable signal with conducting or disconnection respectively.Second selects signal decoder to couple 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 is selected according to the voltage on the 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, provide one or more voltage to transmit switch, and by the transmission enable signal of selecting signal decoder to produce, voltage is transmitted to 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 selected output by having the voltage selector of complicated circuit construction, and can be in the time of needs, directly by voltage, transmit 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, by simple voltage, transmit switch and carry out the transmission of input voltage, also can effectively reduce the layout area of circuit.The present invention also proposes to utilize the driving voltage maker that is used in display device of above-mentioned digital to analog converter institute construction, to provide gamma input voltage more accurately to come as driver output voltage, enters to promote demonstration 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 output 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, the schematic diagram of the digital to analog converter 200 that Fig. 2 is the embodiment of the present invention.Digital to analog converter 200 comprises that voltage selector 210, voltage transmit switch 221～voltage and transmits switch 22M and select signal decoder 230.Voltage selector 210 receives a plurality of input voltage VP[n of analog formats]～input voltage VP[n+M-4] in input voltage VP[n]～input voltage VP[n+2], and receive a plurality of selection signal SEL[n of digital format]～select signal SEL[n+2] and select signal SELB[n]～select signal SELB[n+2].Wherein, select signal SELB[n]～select signal SELB[n+2] be respectively and select signal SEL[n]～select signal SEL[n+2] reverse signal.Voltage selector is according to selecting 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 provide to output terminal OUT1.
In the present embodiment, voltage selector 210 comprises the switch that a plurality of transistor MP21～transistor MP26 form.Wherein, transistor MP21 and transistor MP22 are used for selecting input voltage VP[n] and input voltage VP[n+1] one of them transfer to one end of transistor MP24.Transistor MP21 is controlled by selection signal SELB[n] with conducting or disconnection, transistor MP22 is controlled by selection signal SEL[n] with conducting or disconnection.In addition, transistor MP23 receives input voltage VP[n+2] and be controlled by selection signal SELB[n].That is to say, when transistor MP21 and transistor MP22 are according to selecting signal SEL[n] and select signal SELB[n] transmission input voltage VP[n] during to transistor MP24 (input voltage VP[n] equal voltage V1), transistor MP23 is switched on simultaneously, and transmits input voltage VP[n+2] to one end of transistor MP25 (input voltage VP[n+2] equal voltage V2).Relative, when transistor MP21 and transistor MP22 are according to selecting signal SEL[n] and select signal SELB[n] transmission input voltage VP[n+1] during to transistor MP24 (input voltage VP[n+1] equal voltage V1), transistor MP23 is disconnected simultaneously, and the end points that transistor MP23 and transistor MP25 are 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] with one of them that is used for selecting voltage V1 and voltage V2, input to transistor MP26.Transistor M26 be controlled by select signal SELB[n+2] and conducting or disconnection, and whether determine that one of them of voltage V1 and voltage V2 transferred to output terminal OUT1 usings as output voltage.
In addition, in the present embodiment, voltage transmits switch 221～voltage and transmits switch 22M respectively by the construction of transistor MP27～transistor MP28 institute.Transistor MP27～transistor MP28 is controlled by respectively transmission enable signal HB[n]～enable signal HB[n+M-4] with conducting or disconnection.It should be noted that in transistor MP27～transistor MP28 that a meeting is switched at the most, and directly transmit the input voltage VP[n+3 that it receives]～input voltage VP[n+M-4] one of them to output terminal OUT1.And now the transistor MP26 in voltage selector 210 is the state of disconnection.Above-mentioned n and M are 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 must and transmit transistor MP24 and transistor MP25 couples voltage on end points mutually to output terminal OUT1 for the state of conducting.
Please note, by above-mentioned explanation, can be learnt the input voltage VP[n+3 in the present embodiment]～input voltage VP[n+M-4] can be sent to output terminal OUT1 by voltage transmission switch 221～voltage transmission switch 22M of single transistor MP27～transistor MP28 institute construction.That is to say, at digital to analog converter 200, transmit input voltage VP[n+3]～input voltage VP[n+M-4] one of them while being used as output voltage, the transfer impedance having is very little.If digital to analog converter 200, under operation at a high speed, supposes to have the input voltage VP[n+3 of relatively large absolute value of voltage]～input voltage VP[n+M-4] effectively transferred to output terminal OUT1 and just can be effectively shortened needed time delay.That is to say, the output voltage that digital to analog converter 200 produces can be more accurate.
Below please refer to Fig. 3, the schematic diagram of the digital to analog converter 300 that Fig. 3 is another embodiment of the present invention.Digital to analog converter 300 comprises that voltage selector 310, voltage transmit switch 321～voltage and transmits switch 32M and select signal decoder 330.Voltage selector 310 receives a plurality of input voltage VN[n of analog formats]～input voltage VN[n+M-4] in voltage VN[n]～VN[n+2], and receive a plurality of selection signal SEL[n of digital format]～select signal SEL[n+2] and select signal SELB[n]～select signal SELB[n+2].Wherein, select signal SELB[n]～select signal SELB[n+2] be respectively and select signal SEL[n]～select signal SEL[n+2] reverse signal.Voltage selector 310 is according to selecting 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 provide to output terminal OUT2.Voltage transmits one end that switch 321～voltage transmits switch 32M and receives respectively input voltage VN[n]～input voltage VN[n+M-4] in voltage VN[n+3]～voltage VN[n+M-4].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] with conducting or disconnection.
Not identical with the embodiment of Fig. 2, the switch of the present embodiment all utilizes N-type transistor to carry out construction, therefore, the controlled signal of transistor MN21～transistor MN28 be wherein all Fig. 2 embodiment transistor MP21～transistor MP28 oppositely.And about the action details of the present embodiment, similar with the embodiment shown in Fig. 2, below seldom repeat.
Below please refer to Fig. 4, the schematic diagram of the driving voltage maker 400 that Fig. 4 is one embodiment of the invention.Driving voltage maker 400 is applicable to display device, in the display device of this indication such as being liquid crystal display or light emitting diode indicator etc.Take display device as being example as liquid crystal display, and 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 respectively gamma input voltage VP1～VPP and VN1～VNP and selects signal SEL, SELB, and produces output voltage VO UT1 and VOUT2 to driving voltage output buffer 430 by its output terminal.430 of buffers of driving voltage output are coupled to the output terminal of digital to analog converter 421,422, and select according to the voltage on the output terminal of digital to analog converter 421,422 to produce driver output voltage VDRV according to polarity selection signal POL.
At this, please note, 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 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 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 to 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 output voltage VO UT1 and the VOUT2 of producing 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 when being applied in driving voltage maker 400 tool not driving on for example light emitting diode indicator of polarity, digital to analog converter 421, digital to analog converter 422 be can be for the voltage of driver output voltage positive and negative selects a use, certainly, with this understanding, 430 of driving voltage output buffer storages are selected signal POL without receiving polarity, and only need the driving force of 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 set the part voltage make in input voltage and by voltage, transmit switch and be sent to the output terminal at digital to analog converter.So, these input voltages that are coupled to voltage transmission switch, when carrying out voltage transmission, do not need, through having the voltage transmission route of high impedance, can be transferred into faster output terminal, to accelerate the voltage transitions efficiency of digital to analog converter.In addition, by simple voltage, transmit the configuration of switch, can also effectively 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, in display frame, have under the state of high picture update rate, can effectively promote the quantity that it shows usefulness and reduces circuit component, take into account the lifting of product quality and price competitiveness.
Finally it should be noted that: each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit above; Although the present invention is had been described in detail with reference to aforementioned each 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 some or all of technical characterictic is wherein equal to replacement; And these modifications 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, N the first voltage in a plurality of input voltages of reception analog format, and receive a plurality of selection signals of digital format, this voltage selector according to those select signals select those the first voltages maximum one of them to provide to an output terminal;
M voltage transmits switch, one end of those voltages transmission switches receives respectively M second voltage of non-those the first voltages in those input voltages, the other end that those voltages transmit switch is connected to this output terminal jointly, and those voltages transmit switch and according to M, transmit enable signal with conducting or disconnection respectively; And
One selects signal decoder, couples those voltages and transmits switch, and according to those, select signal to produce those and transmit enable signal,
Wherein, M and N are all positive integer.
2. digital to analog converter according to claim 1, is characterized in that, those voltages transmit 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, one of them that select those the first voltages when this voltage selector is when providing to this output terminal, and those voltages transmit switches and are all disconnected.
4. digital to analog converter according to claim 2, is characterized in that, arbitrary when providing to this output terminal when non-selected those the first voltages of this voltage selector, those voltages transmit switches 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, N the first voltage in a plurality of first gamma input voltages of reception analog format, and receive a plurality of first of digital format and select signals, this first voltage selector according to those first select signals select those the first voltages maximum one of them to provide to one first output terminal;
M first voltage transmits switch, one end of those first voltages transmission switches receives respectively M second voltage of non-those the first voltages in those the first gamma input voltages, the other end that those first voltages transmit switch is connected to this first output terminal jointly, and those first voltages transmit switch and according to M individual first, transmit enable signal with conducting or disconnection respectively; And
One first selects signal decoder, couples those first voltages and transmits switch, according to those the first selection signals, produces those the first transmission enable signals, and wherein, M and N are all positive integer.
6. driving voltage maker according to claim 5, is characterized in that, also comprises:
One second digital to analog converter, comprising:
One second voltage selector switch, N tertiary voltage in a plurality of second gamma input voltages of reception analog format, and receive a plurality of second of digital format and select signals, this second voltage selector switch according to those second select signals select those tertiary voltages maximum one of them to provide to one second output terminal;
M second voltage transmits switch, one end of those second voltages transmission switches receives respectively M the 4th voltage of non-those second voltages in those the second gamma input voltages, the other end that those second voltages transmit switch is connected to this second output terminal jointly, and those second voltages transmit switch and according to M individual second, transmit enable signal with conducting or disconnection respectively; And
One second selects signal decoder, couples those second voltages and transmits switch, according to those the second selection signals, produces those the second transmission enable signals.
7. driving voltage maker according to claim 6, is characterized in that, also comprises:
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 comprises:
One driving voltage output buffer, be coupled to this first and this second output terminal, this driving voltage output buffer according to a polarity selection signal select according to 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 voltages transmit a switch conducting according to those first transmission enable signals at the most, and those second voltages transmit switches conducting according to those second transmission enable signals at the most.
10. driving voltage maker according to claim 9, it is characterized in that, one of them that select those the first voltages when this first voltage selector is when providing to this first output terminal, those first voltages transmit switch and are all disconnected, one of them that select those tertiary voltages when this second voltage selector switch is when providing to this second output terminal, and those second voltages transmit switches and are all disconnected.
11. driving voltage makers according to claim 9, it is characterized in that, arbitrary when providing to this first output terminal when non-selected those the first voltages of this first voltage selector, one of them of those first voltages transmission switches is switched on, arbitrary when providing to this second output terminal when non-selected those tertiary voltages of this second voltage selector switch, those second voltages transmit switches one of them be switched on.
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| US9716503B2 (en) | 2015-07-22 | 2017-07-25 | Nuvoton Technology Corporation | Function programmable circuit and operation method thereof |
| 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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| CN103544913B (en) | 2016-01-06 |
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