CN101409036B - Multi-level point-to-point transmission system as well as transmission terminal circuit and receiving terminal circuit thereof - Google Patents
Multi-level point-to-point transmission system as well as transmission terminal circuit and receiving terminal circuit thereof Download PDFInfo
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- CN101409036B CN101409036B CN2007101629928A CN200710162992A CN101409036B CN 101409036 B CN101409036 B CN 101409036B CN 2007101629928 A CN2007101629928 A CN 2007101629928A CN 200710162992 A CN200710162992 A CN 200710162992A CN 101409036 B CN101409036 B CN 101409036B
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Abstract
The invention discloses a multilevel point-to-point transmission system. The transmission system comprises at least one terminal resistor, a transmission terminal circuit and a receiving terminal circuit, wherein, the transmission terminal circuit comprises a first external resistor and a transmitter. The transmitter generates a first reference current based on the first external resistor, and determines the current flowing through an output terminal based on a transmission data and the first reference current. The receiving terminal circuit comprises a second external resistor, a third external resistor and at least one receiver. The receiver generates a second reference current based on the second external resistor, and generates a reference voltage difference based on the second reference current and the third external resistor. The receiver judges the voltage on the receiving terminal based on the reference voltage difference so as to correctly receive the transmission data.
Description
Technical field
The present invention relates to the point-to-point transmission system of a kind of many level and transmission ends circuit and receiving terminal circuit, and particularly relate to a kind of point-to-point transmission system of a kind of many level and transmission ends circuit and receiving terminal circuit that can be applicable to the large scale display panel.
Background technology
Display panel technology in recent years has been tending towards the ripe stage, but along with consumer demand, the size of display panel is done bigger and bigger, and resolution is done higher and higher.Yet, when the resolution of display panel and size increase, will cause the panel operating frequency inside more and more higher.Traditional display panel internal transmission system is owing to need how right transmission line, under the environment of high frequency, will be difficult to allow every transmission lines have close electrically.Therefore, receiving end is not easy this is made effective correction mechanism, and therefore bit error rate (bit errorrate) also can't reduce.The system that the more important thing is needs original special this problem of handling of extra one-tenth, and therefore competitiveness of product also can't promote.
Figure 1A is the transmission system embodiment of traditional a kind of display panels.This transmission system comprises time schedule controller TCON and several chip for driving SD1, SD2..., SDN.Wherein, time schedule controller TCON with image data by a pair of clock (clock) transmission line and several transmission line is imported into chip for driving SD1～SDN in the panel.And every pair of transmission line can be connected to the input end of all chip for driving SD1～SDN.Figure 1B is the thin portion circuit diagram of Figure 1A, and time schedule controller TCON is the transmission ends circuit, and several chip for driving SD1～SDN is a receiving terminal circuit.Time schedule controller TCON and several chip for driving SD1～SDN are combined into transmission system.Input data DI_1, DI_2, DI_3 ..., DI_N and input clock signal CKI via single-ended to differential wave converter TX1, TX2, TX3 ..., TXN, TXCK (single to differential converter) with signal export to chip for driving SD1～SDN receiving end comparer RX1, RX2, RX3 ..., RXN, RXCK.Comparer RX1, the RX2 of receiving end, RX3 ..., RXN, RXCK be via more positive negative signal, can obtain corresponding digital value 1 or 0.Yet this structure wiring is numerous and diverse, load is heavy, noise is grown thickly, and is not suitable for high frequency and large size panel and uses.
Transmission system in the conventional display panels is to use several transmission systems to transmission line mostly.For receiving end, as long as a simple comparer can be separated out with the data that receive.
Yet, along with panel size is more and more big, in order to reduce transmission line effect (transmission line), be necessary to use the transmission mode of many level point-to-point (multi-level point-to-point) on the transmission system of display panel to reduce transmitted frequency.But, the receiving end of many level point-to-point (multi-levelpoint-to-point) transmission system needs one group of accurate level comparator but not simple end points comparer for the data of many level, and on medium-and-large-sized panel, all chip for driving are used same control chip.Therefore, the reference voltage level of each chip for driving receiving end need have consistance with the reference voltage of transmission end, to prevent decoding error.
Based on the difficulty of above traditional transmission system, the point-to-point transmission system of many level can effectively reduce the difficult design degree of large scale display panel.But the receiving end of the point-to-point transmission system of many level must produce the reference voltage producing method identical with the transmission end, just can correctly decode transmitting signal.But because technologic difference makes point-to-point transmission system transmission ends of many level and receiving end be difficult to agreeing property.So the general practice is to use built-in fine tuning mechanism (fine tune) to remedy technologic difference.In addition, owing to not only one of the chip for driving on the panel, how allowing each chips that identical fine tuning mechanism is arranged, then is the place that present panel manufacturers is badly in need of Gonna breakthrough.
Summary of the invention
The invention provides the point-to-point transmission system of a kind of many level, this system can produce the mode of output current or signal level according to the transmission ends circuit, and duplicates on each receiver of receiving terminal circuit to produce reference voltage.And the reference voltage difference is not subjected to Effect of Environmental such as technology, temperature and voltage.
The present invention provides a kind of transmission ends circuit that is suitable for the above-mentioned point-to-point transmission system of many level in addition, and the mode that this transmission ends circuit produces output current or signal level is to be replicated easily, and be not subjected to technology, Effect of Environmental such as temperature and voltage.
The present invention provides a kind of receiving terminal circuit that is suitable for the above-mentioned point-to-point transmission system of many level again, and this receiving terminal circuit produces reference voltage according to the mode of transmission ends circuit generation output current or signal level.And reference voltage is not subjected to Effect of Environmental such as technology, temperature and voltage.
The present invention provides a kind of point-to-point signal transmission system again, and this system can produce the mode of output current or signal level according to the transmission ends circuit, and duplicates on each receiver of receiving terminal circuit to produce reference voltage.And the reference voltage difference is not subjected to Effect of Environmental such as technology, temperature and voltage.
The invention provides the point-to-point transmission system of a kind of many level.This transmission system comprises at least one terminal resistance, transmission ends circuit and receiving terminal circuit.Wherein, the transmission ends circuit comprises first outer meeting resistance and transmitter.This transmitter has first reference edge and at least one output terminal, and first reference edge is coupled to first outer meeting resistance, and the output terminal of transmitter is coupled to terminal resistance.This transmitter produces first reference current according to first outer meeting resistance, and decides the electric current of the output terminal of flowing through according to transmission data and first reference current.Receiving terminal circuit comprises second outer meeting resistance, the 3rd outer meeting resistance and at least one receiver.Receiver has second reference edge, the 3rd reference edge and receiving end, and second reference edge is coupled to second outer meeting resistance, and the 3rd reference edge is coupled to the 3rd outer meeting resistance, and receiving end couples the output terminal of transmitter so far.This receiver produces second reference current according to second outer meeting resistance, and it is poor to produce reference voltage according to second reference current and the 3rd outer meeting resistance.Receiver is then judged voltage on the receiving end according to the reference voltage difference, with correct reception transmission data.
According to the point-to-point transmission system of the described many level of the embodiment of the invention, above-mentioned transmitter comprises transmission ends current generating circuit and a plurality of pulse strength modulator.The transmission ends current generating circuit is coupled to first reference edge.The transmission ends current generating circuit produces first reference current according to first outer meeting resistance.A plurality of pulse strength modulators are coupled to the output terminal of transmission ends current generating circuit and transmitter.A plurality of pulse strength modulators decide electric current and the proportionate relationship of first reference current of the output terminal of the transmitter of flowing through according to the bit code of transmission data, and terminal resistance produces a plurality of different voltage levels on the output terminal of transmitter to arrange in pairs or groups.
According to the point-to-point transmission system of the described many level of the embodiment of the invention, above-mentioned receiver comprises arrival current tracking circuit, second bleeder circuit, a plurality of intensity comparer and a plurality of heat sign indicating number demoder.The arrival current tracking circuit is coupled to second reference edge and the 3rd reference edge.The arrival current tracking circuit produces second reference current according to second outer meeting resistance, and it is poor to produce reference voltage according to second reference current and the 3rd outer meeting resistance.First bleeder circuit is according to reference voltage difference and one second predetermined ratio, and it is poor to produce a plurality of sub-reference voltages.A plurality of intensity comparers are coupled to second bleeder circuit and receiving end.A plurality of intensity comparers compare voltage on the receiving end and the sub-reference voltage difference of part to obtain many group heat sign indicating numbers.A plurality of heat sign indicating number demoders are coupled to the intensity comparer.A plurality of heat sign indicating number demoders will be organized the transmission data that the heat sign indicating number is decoded back correct more.
The invention provides a kind of transmission ends circuit, this transmission ends circuit can be used for the point-to-point transmission system of level more than, and this transmission ends circuit and at least one terminal resistance couple.This transmission ends circuit comprises first outer meeting resistance and transmitter.This transmitter has first reference edge and at least one output terminal, and first reference edge is coupled to first outer meeting resistance, and the output terminal of transmitter is coupled to terminal resistance.This transmitter comprises transmission ends current generating circuit and a plurality of pulse strength modulator.The transmission ends current generating circuit is coupled to first reference edge, and produces first reference current according to first outer meeting resistance.The pulse strength modulator is coupled to the output terminal of transmission ends current generating circuit and transmitter, and decides the electric current of output terminal of the transmitter of flowing through and the proportionate relationship between first reference current according to the bit code of transmission data.Utilize this proportionate relationship and the terminal resistance of arranging in pairs or groups on the output terminal of transmitter, to produce a plurality of different voltage levels.
According to the described transmission ends circuit of the embodiment of the invention, above-mentioned transmission ends current generating circuit comprises first bleeder circuit, operational amplifier and current mirror.First bleeder circuit produces one first reference voltage according to input voltage and one first predetermined ratio.Operational amplifier has first input end, second input end and output terminal.The first input end and first bleeder circuit couple, and second input end and first reference edge couple.Current mirror is coupled to the output terminal and first reference edge of operational amplifier, in order to duplicate and to export first reference current.Wherein, utilize this kind coupling mode, first reference current can be produced by first reference voltage and first outer meeting resistance.
The invention provides a kind of receiving terminal circuit, be used for the point-to-point transmission system of level more than.This receiving terminal circuit comprises second outer meeting resistance, the 3rd outer meeting resistance and at least one receiver.Receiver has second reference edge, the 3rd reference edge and receiving end.Second reference edge is coupled to second outer meeting resistance, and the 3rd reference edge is coupled to the 3rd outer meeting resistance.Receiver comprises arrival current tracking circuit, second bleeder circuit, a plurality of intensity comparer and a plurality of heat sign indicating number demoder.The arrival current tracking circuit is coupled to second reference edge and the 3rd reference edge.The arrival current tracking circuit produces second reference current according to second outer meeting resistance, and it is poor to produce a reference voltage according to second reference current and the 3rd outer meeting resistance.It is poor that second bleeder circuit produces a plurality of sub-reference voltages according to reference voltage difference and one second predetermined ratio.A plurality of intensity comparers are coupled to the receiving end of second bleeder circuit and receiver.A plurality of intensity comparers compare voltage on the receiving end of receiver and the sub-reference voltage difference of part, obtain many group heat sign indicating numbers by this.A plurality of heat sign indicating number demoders are coupled to the intensity comparer.A plurality of heat sign indicating number demoders in order to will organize heat sign indicating number decoding transmission back data more.
According to the described receiving terminal circuit of the embodiment of the invention, above-mentioned arrival current tracking circuit comprises the 3rd bleeder circuit, operational amplifier and on-off circuit.The 3rd bleeder circuit produces second reference voltage according to input voltage and one the 3rd predetermined ratio.Operational amplifier has first input end, second input end and output terminal.The first input end of operational amplifier and the 3rd bleeder circuit couple, and second input end and second reference edge of operational amplifier couple.On-off circuit has enable signal receiving end, current input terminal and current output terminal.The current input terminal of on-off circuit and second reference edge couple, and the current output terminal of on-off circuit and the 3rd reference edge couple.The enable signal receiving end receives the enable signal of an input, and whether control exports the current output terminal of second reference current to on-off circuit by this.Wherein, utilize above-mentioned coupling mode, second reference current can be produced by second reference voltage and second outer meeting resistance.
The invention provides a kind of point-to-point signal transmission system, comprise transmission ends circuit and receiving terminal circuit.Wherein receiving terminal circuit is coupled to the transmission ends circuit.The transmission ends circuit is exported at least one current signal according to the transmission data.Receiving terminal circuit comprises a plurality of receiving elements and at least one reference unit.Wherein, reference unit is coupled to receiving element.Receiving terminal circuit receives the current signal that the transmission ends circuit is sent, and current signal is converted to the reception voltage signal.Reference unit is poor in order to produce reference voltage, and the reference voltage difference is sent to a plurality of receiving elements, wherein, it is poor that these a plurality of receiving elements produce a plurality of sub-reference voltages according to reference voltage, and relatively receive a plurality of therewith sub-reference voltage differences of voltage signal to obtain a numerical data.
According to embodiments of the invention, above-mentioned transmission ends circuit comprises first outer meeting resistance, first reference edge, transmission ends current generating circuit and pulse strength modulator.Wherein, first reference edge is coupled to outer meeting resistance, and the transmission ends current generating circuit is coupled to first reference edge, and the pulse strength modulator is coupled to the transmission ends current generating circuit.The transmission ends current generating circuit is in order to produce first reference current according to first outer meeting resistance.The pulse strength modulator is according to the current value of the bit code decision current signal of transmission data and the proportionate relationship of first reference current.In addition, above-mentioned reference unit comprises second outer meeting resistance, the 3rd outer meeting resistance, second reference edge, the 3rd reference edge and arrival current tracking circuit.Wherein, second reference edge is coupled to second outer meeting resistance, and the 3rd reference edge is coupled to the 3rd outer meeting resistance, and the arrival current tracking circuit is coupled to second reference edge and the 3rd reference edge.The arrival current tracking circuit produces second reference current according to second outer meeting resistance, and it is poor to produce reference voltage according to second reference current and the 3rd outer meeting resistance.
The present invention is the point-to-point transmission system of a kind of many level and transmission ends circuit and receiving terminal circuit.The present invention is because of using above-mentioned structure, and receiving terminal circuit is able to produce according to the transmission ends circuit mode of output current or signal level, and duplicates on each receiver of receiving terminal circuit to produce reference voltage.Therefore, reference voltage is not subjected to Effect of Environmental such as technology, temperature and voltage.
For above and other objects of the present invention, feature and advantage can be become apparent, several embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Figure 1A is the transmission system embodiment of traditional a kind of display panels.
Figure 1B is the thin portion circuit diagram of Figure 1A
Fig. 2 is a kind of embodiment of the point-to-point transmission system of many level of the present invention.
Fig. 3 is the circuit diagram of transmitter 211 among Fig. 2 embodiment.
Fig. 4 is the thin portion circuit diagram of transmission ends current generating circuit 30 among Fig. 3.
Fig. 5 is the circuit diagram of receiver 222.
Fig. 6 is the thin portion circuit diagram of arrival current tracking circuit 50.
Fig. 7 is the embodiment of the use common-mode circuit structure of several pulse strength modulators 31 among Fig. 3.
The reference numeral explanation
TCO: time schedule controller
SD1, SD2..., SDN: chip for driving
TX1, TX2, TX3 ..., TXN, TXCK: single-ended to the differential wave converter
RX1, RX2, RX3 ..., RXN, RXCK: comparer
RT: terminal resistance
21: the transmission ends circuit
22: receiving terminal circuit
RS1: first outer meeting resistance
211: transmitter
RS2: second outer meeting resistance
RS3: the 3rd outer meeting resistance
222: receiver
30: the transmission ends current generating circuit
31: the pulse strength modulator
40: the first bleeder circuits
41: operational amplifier
42: current mirror
50: the arrival current tracking circuit
51: the second bleeder circuits
52: the intensity comparer
53: heat sign indicating number demoder
54: the voltage transitions level
60: the three bleeder circuits
61: operational amplifier
62: on-off circuit.
Embodiment
The invention provides the point-to-point transmission system of a kind of many level, this system can produce the mode of output current or signal level according to the transmission ends circuit, and duplicates on each receiver of receiving terminal circuit to produce reference voltage.And the reference voltage difference is not subjected to Effect of Environmental such as technology, temperature and voltage.In addition, the point-to-point transmission system of these many level is applicable to large-sized display panels.
Please refer to Fig. 2, Fig. 2 is a kind of embodiment of the point-to-point transmission system of many level of the present invention.This transmission system comprises several terminal resistances RT, transmission ends circuit 21 and receiving terminal circuit 22.Wherein, transmission ends circuit 21 comprises the first outer meeting resistance RS1 and transmitter 211.Transmitter 211 has the first reference edge 211REF1 and several output terminals 211OUT.The first reference edge 211REF1 is coupled to the first outer meeting resistance RS1, and several output terminals 211OUT is coupled to several terminal resistances RT.Transmitter 211 produces one first reference current IREF1 according to the first outer meeting resistance RS1, and the electric current that decides all output terminal 211OUT that flow through according to the defeated transmission data of 211 tendencies to develop of transmitter and the first reference current IREF1.Receiving terminal circuit 22 comprises the second outer meeting resistance RS2, the 3rd outer meeting resistance RS3 and several receivers 222.These receivers 222 have the second reference edge 222REF2, the 3rd reference edge 222REF3 and several receiving ends IP﹠amp; IN.The second reference edge 222REF2 is coupled to the second outer meeting resistance RS2, and the 3rd reference edge 222REF3 is coupled to the 3rd outer meeting resistance RS3, these receiving ends IP﹠amp; IN is coupled to all output terminal 211OUT of transmitter 211.Receiver 222 produces the second reference current IREF2 according to the second outer meeting resistance RS2, and produces a reference voltage difference VCC-VRTS according to the second reference current IREF2 and the 3rd outer meeting resistance RS3.222 of receivers are judged voltage on the receiving end according to reference voltage difference VCC-VRTS, with correct reception by the defeated transmission data of 211 tendencies to develop of transmitter.
Please refer to Fig. 3.Fig. 3 is the circuit diagram of transmitter 211 among Fig. 2 embodiment.Transmitter 211 comprises the pulse strength modulator 31 (Fig. 3 only represents the pulse strength modulator 30 of one 4 level) of a transmission ends current generating circuit 30 and a plurality of 4 level.Transmission ends current generating circuit 30 is coupled to the first reference edge 211REF1.Transmission ends current generating circuit 30 produces the first reference current IREF1 according to the first outer meeting resistance RS1.A plurality of pulse strength modulators 31 are coupled to transmission ends current generating circuit 30 and output terminal 211OUT.The pulse strength modulator 31 of a plurality of 4 level is according to the bit code of 211 tendency to develop transmission of data of transmitter, decide the proportionate relationship of the electric current and the first reference current IREF1 of all output terminal 211OUT that flow through, RT produces a plurality of different voltage levels on output terminal 211OUT with the collocation terminal resistance.
The dimension scale relation of supposing the transistor P01 of Fig. 3 is K a times of transistor P00, and the dimension scale relation of transistor P02 is 2 times of transistor P01.Electric current I O=K*IREF1 then, and electric current I O '=2*IO=2K*IREF1.Therefore, this 4 level intensity modulator 31 can decide the electric current of all outflow output terminal 211OUT according to the first reference current IREF1 and 211 tendencies to develop of transmitter defeated transmission data D1, D2.All flow out the electric current of output terminal 211OUT by terminal resistance RT the time, can produce the voltage of several varying levels.
Please refer to Fig. 4, Fig. 4 is the thin portion circuit diagram of transmission ends current generating circuit 30 among Fig. 3.Transmission ends current generating circuit 30 comprises first bleeder circuit 40, operational amplifier 41 and current mirror 42.Operational amplifier 41 has first input end 41I1, the second input end 42I2 and output terminal 410.The first input end 41I1 and the bleeder circuit 40 of operational amplifier 41 couple, and the second input end 41I2 and the first reference edge 211REF1 of operational amplifier 41 couple.Current mirror 42 is coupled to the output terminal 410 and the first reference edge 211REF1 of operational amplifier 41.First bleeder circuit 40 produces the first reference voltage VREF1=(VCC*R11)/(R11+R12) according to the input voltage VCC and the first predetermined ratio R11/ (R11+R12).The transistor PB0 of current mirror 42 all is identical size proportionate relationship with PB1, NB0 and NB1, and then current mirror 42 can duplicate and export the first reference current IREF1.Wherein, utilize above-mentioned coupling mode, the first reference current IREF1 can be produced by the first reference voltage VREF1 and the first outer meeting resistance RS1.That is the first reference current IREF1 is the value (IREF1=VREF1/RS1) of the value of the first reference voltage VREF1 divided by the first reference resistance RS1.
Refer again to Fig. 3 and Fig. 4.Via above-mentioned hypothesis with couple the arrangement of relation, when the pulse strength modulator 31 of 4 level allowed electric current I O flow through terminal resistance RT, the terminal resistance RT that couples with the pulse strength modulator 31 of 4 level can produce a voltage level.Transmission data D1=1, D2=0 in Fig. 3 have electric current I O with the transistor M1B of the pulse strength modulator 31 of 4 level, terminal resistance RT that M2B couples and flow through, and RT can produce voltage level Vamp=IO*RT at this terminal resistance.And flow through with electric current that the transistor M1 of the pulse strength modulator 31 of 4 level, terminal resistance RT that M2 couples have 2 times of IO, can produce the voltage level of 2 times of Vamp at this terminal resistance RT.When transmission data D1=1, D2=1, the electric current that has 3 times of IO with the transistor M1 of the pulse strength modulator 31 of 4 level, terminal resistance RT that M2 couples flows through, and can produce the voltage level of 3 times of Vamp at this terminal resistance RT.When transmission data D1=0, D2=1, then have electric current I O and flow through with the transistor M1 of the pulse strength modulator 31 of 4 level, terminal resistance RT that M2 couples, RT can produce voltage level Vamp at this terminal resistance.And flow through with electric current that the transistor M1 of the pulse strength modulator 31 of 4 level, terminal resistance RT that M2 couples have 2 times of IO, can produce the voltage level of 2 times of Vamp at this terminal resistance RT.When transmission data D1=0, D2=0, the electric current that has 3 times of IO with the transistor M1B of the pulse strength modulator 31 of 4 level, terminal resistance RT that M2B couples flows through, and can produce the voltage level of 3 times of Vamp at this terminal resistance RT.
Above-mentioned current mirror 42 can substitute with the current mirror of other kind, and the intensity modulator 41 of 4 above-mentioned level also can be the modulator of other level, for example says the intensity modulator of 8 level.Though the present invention uses above-mentioned resistance value and the above-mentioned example that is assumed to be, non-in order to limit the present invention, other meets the resistance value of spirit of the present invention, when also within protection scope of the present invention.
Comprehensively above-mentioned, transmitter 211 has the first reference current IREF1, and this first electric current I REF1 can decide by the first outer meeting resistance RS1.Therefore, transmitter 211 can decide all to flow out the electric current of output terminal 211OUT according to the first reference current IREF1 and 211 tendencies to develop of transmitter defeated transmission data D1, D2.
Please refer to Fig. 5, Fig. 5 is the circuit diagram of receiver 222.Receiver 222 comprises the intensity comparer 52 (Fig. 5 only represents the intensity comparer 52 of one 4 level) of arrival current tracking circuit 50, second bleeder circuit 51, a plurality of 4 level, an a plurality of heat sign indicating number demoder 53 (Fig. 5 only represents a heat sign indicating number demoder 53) and a voltage transitions level 54.Arrival current tracking circuit 50 is coupled to the second reference edge 222REF2 and the 3rd reference edge 222REF3.The intensity comparer 52 of 4 level is coupled to receiving end IP, the IN of second bleeder circuit 51 and receiver 222.Voltage transitions level 54 has an output terminal 540 and an input end 54I.The input end 54I of voltage transitions level 54 and the 3rd reference edge 222REF3 couple, and the output terminal 540 of voltage transitions level 54 and second bleeder circuit 51 couple.Heat sign indicating number demoder 53 is coupled to the intensity comparer 52 of 4 level.Arrival current tracking circuit 50 produces the second reference current IREF2 according to the second outer meeting resistance RS2, and producing reference voltage according to the second reference current IREF2 and the 3rd outer meeting resistance RS3, poor (the reference voltage difference equals VCC-VRTS, wherein, VRTS=VCC-RS3*IREF2).Second bleeder circuit 51 is according to the reference voltage difference and second predetermined ratio, and it is poor to produce a plurality of sub-reference voltages, and wherein, a sub-reference voltage difference is VREF3.Voltage transitions level 54 is converted to output terminal 540 in order to the voltage VRTS with the 3rd reference edge 222REF3.The intensity comparer 52 of 4 level compares voltage on receiving end IP, the IN and sub-reference voltage difference VREF3 to obtain the heat sign indicating number.Heat sign indicating number demoder 53 is with heat sign indicating number decoding transmission back data.
Aforesaid voltage transitions level 54 comprises operational amplifier OP2 and field-effect transistor N11.The first input end of operational amplifier OP2 is as the input end 54I of voltage transitions level, and second input end of operational amplifier OP2 is as the output terminal 540 of voltage transitions level.The output terminal of the grid of field-effect transistor N11 (gate) utmost point and operational amplifier OP2 couples, and the output terminal 540 of the leakage of field-effect transistor N11 (drain) utmost point and voltage transitions level 54 couples, the source of field-effect transistor N11 (source) utmost point ground connection.The above-mentioned element of mat can be copied to the voltage of input end 54I output terminal 540 with the voltage transitions level 54 that the relation of coupling forms.Yet above-mentioned embodiment is non-in order to limit the present invention, and electric pressure converter 54 can also be reached with other circuit.Therefore, spirit all and of the present invention conforms to and does not break away from the scope person of content of the present invention, all belongs to the present invention.
Please refer to Fig. 6, Fig. 6 is the thin portion circuit diagram of arrival current tracking circuit 50.Arrival current tracking circuit 50 comprises the 3rd bleeder circuit 60, operational amplifier 61 and on-off circuit 62.Bleeder circuit 60 produces the second reference voltage VREF2=(VCC*R21)/(R21+R22) according to input voltage VCC and the 3rd predetermined ratio R21/ (R21+R22).Operational amplifier 61 has first input end, second input end and output terminal.First input end and bleeder circuit 60 couple, and second input end and the second reference edge 222REF2 couple.On-off circuit 62 has enable signal receiving end EN, current input terminal 62I and current output terminal 620.The current input terminal 62I of on-off circuit 62 and the second reference edge 222REF2 couple, and the current output terminal 620 and the 3rd reference edge of on-off circuit 62 couple 222REF3.Enable signal receiving end EN receives the enable signal of an input, and whether control exports the second reference current IREF2 to current output terminal 620 by this.Wherein, utilize above-mentioned coupling mode, the second reference current IREF2 can be produced (IREF2=VREF2/RS2) by the second reference voltage VREF2 and the second outer meeting resistance RS2.
Aforesaid on-off circuit 62 comprises phase inverter INV and two field-effect transistor N12, Nclp2.Phase inverter INV input end and enable signal receiving end EN couple.Phase inverter INV is in order to export anti-phase enable signal.The grid of the drain electrode of field-effect transistor N12 and field-effect transistor Nclp2 couples, the grid of field-effect transistor N12 with couple the source ground of field-effect transistor N12 with the output terminal of phase inverter INV.The output terminal of the grid of field-effect transistor Nclp2 and operational amplifier 61 couples, and the drain electrode of effect transistor Nclp2 is the current output terminal 620 of on-off circuit 62, and the source electrode of field-effect transistor Nclp2 is the current input terminal 62I of on-off circuit 62.By above-mentioned element with couple relation, can reach the function of above-mentioned on-off circuit 62, this on-off circuit 62 can otherwise be implemented, and non-ly limits the present invention in order to above-mentioned embodiment.
See also Fig. 5, the difference of the voltage level that receives when the intensity comparer 52 of 4 level is greater than the second bleeder circuit 51 sub-reference voltage difference VREF3 that provides, then one group of heat sign indicating number of intensity comparer 52 outputs { Hi, Mid, Lo}={1,1, the 1} of 4 level.The negative value of the sub-reference voltage difference VREF3 that the difference of the voltage level that receives when the intensity comparer 52 of 4 level is provided less than bleeder circuit 51, then one group of heat sign indicating number of intensity comparer 52 outputs { Hi, Mid, Lo}={0,0,0}.The sub-reference voltage difference VREF3 that the difference of the voltage level that receives when the intensity comparer 52 of 4 level is provided less than bleeder circuit 51, and greater than the voltage of 0 level, then one group of heat sign indicating number of intensity comparer 52 outputs { Hi, Mid, Lo}={0,1,1}.The difference of the voltage level that receives when the intensity comparer 52 of 4 level is greater than the negative value of the bleeder circuit 51 sub-reference voltage difference VREF3 that provides, and less than the voltage of 0 level one group of heat sign indicating number of intensity comparer 52 outputs { Hi, Mid, Lo}={0,0,1} then.With this embodiment, heat sign indicating number demoder 53 can be separated the transmission back data with the heat sign indicating number of output.When this group heat sign indicating number is that { 1,1, during 1}, the transmission data that then solve are { D1, D2}={1,1}.When this group heat sign indicating number is that { 0,1, during 1}, the transmission data that then solve are { D1, D2}={1,0}.When this group heat sign indicating number is that { 0,0, during 1}, the transmission data that then solve are { D1, D2}={0,1}.When this group heat sign indicating number is that { 0,0, during 0}, the transmission data that then solve are { D1, D2}={0,0}.
Please refer to Fig. 3, Fig. 4, Fig. 5 and Fig. 6.The sub-reference voltage difference VREF3 that produces for the receiving terminal circuit 22 that makes Fig. 5 is the voltage level of 2 times of Vamp.When process, the internal resistance ratio that can adjust second bleeder circuit 51 makes R3=R31=R32=R33=...=R3M.Sub-reference voltage difference VREF3=(VCC-VRTS)/M of being produced of 51 of second bleeder circuits thus.Again via aforesaid hypothesis with VCC-VRTS=(VREF2/RS2) * RS3 as can be known is described, in order to allow the voltage level of sub-reference voltage difference VREF3 just be 2 times Vamp voltage level (VREF3=(VREF2/RS2) * RS3/M=2*K*RT*VREF1/RS1)).The internal resistance R11 that adjusts first bleeder circuit 40 makes first reference voltage VREF1 with second reference voltage VREF2 equate (VREF1=VREF2) with the internal resistance R21 of the 3rd bleeder circuit 60 with the ratio of R22 with the ratio of R12.Allow the resistance identical (RS1=RS2) of the first outer meeting resistance RS1 and the second outer meeting resistance RS2.According to above-mentioned mathematical relation, as long as the resistance of the 3rd outer meeting resistance RS3 is 2*K*M*RT (RS3=2*K*M*RT), sub-reference voltage difference VREF3 will equal 2 times Vamp.Not lose the numerical value of generalized case, if K=20, M=5 and RT=50, then the resistance of the 3rd outer meeting resistance RS3 is 2*20*5*50=10000 ohm.Thus, receiving terminal circuit 22 just can be followed according to reference voltage difference VCC-VRTS and be judged voltage on the receiving end, with correct reception by the defeated transmission data of 211 tendencies to develop of transmitter.
The present invention uses above-mentioned resistance value and the above-mentioned example that is assumed to be, but non-other meets the resistance value of spirit of the present invention in order to limit the present invention, even other resistance value, when also within protection scope of the present invention.
The intensity comparer 52 and the hot demoder 53 of 4 above-mentioned in addition level are a kind of embodiments that correspond to the intensity modulator 31 of 4 level.If above-mentioned intensity modulator is the intensity modulator (for example intensity modulator of 8 level) of other level, then intensity comparer and hot demoder have corresponding embodiment.In brief, above-mentioned embodiment is non-, and other meets the embodiment of spirit of the present invention in order to limit the present invention, also when in protection scope of the present invention.
Fig. 7 is the another kind of embodiment of pulse strength modulator 31 of 4 level of Fig. 3.The pulse strength modulator 31 of 4 level of Fig. 3 is the circuit structure of single-ended input.The feedback circuit structure that several pulse strength modulators 31 are or have common modality among Fig. 7.The aforesaid terminal resistance RT of its advantage can be serially connected with the positive and negative terminal of common mode output terminal, to reduce interference of noise by this.Fig. 3 is identical with the function of the pulse strength modulator 31 of Fig. 7, and its different place only is that Fig. 3 is single-ended input and output, and Fig. 7 is common mode voltage input and output.Single-ended input has only D1 and D2, and the common mode voltage input has D1+, D1-and D2+, D2-.Wherein, D1+ is D1, and D1-is the negative value of D1, and D2+ is D2, and D2-is the negative value of D2.
Comprehensive the above, the embodiment of the invention provides a kind of level point-to-point transmission system.The receiving terminal circuit of this system produces reference voltage according to the transmission ends circuit generation output current of this system or the mode of signal level.And reference voltage is not subjected to Effect of Environmental such as technology, temperature and voltage.
In addition, the embodiment of the invention provides a kind of transmission ends circuit that is suitable for the above-mentioned point-to-point transmission system of many level, the mode that this transmission ends circuit produces output current or signal level is to be replicated easily, and be not subjected to technology, Effect of Environmental such as temperature and voltage.
And the embodiment of the invention also provides a kind of receiving terminal circuit that is suitable for the above-mentioned point-to-point transmission system of many level, and this receiving terminal circuit produces reference voltage according to the mode of transmission ends circuit generation output current or signal level.And reference voltage is not subjected to Effect of Environmental such as technology, temperature and voltage.
Though the present invention discloses as above with embodiment; right its is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the claim person of defining of the present invention.
Claims (27)
1. the point-to-point transmission system of level more than a kind comprises:
At least one terminal resistance;
One transmission ends circuit comprises:
One first outer meeting resistance; And
One transmitter, have one first reference edge and at least one output terminal, this first reference edge is coupled to this first outer meeting resistance, this output terminal is coupled to this terminal resistance, this transmitter produces one first reference current according to this first outer meeting resistance, and decides the electric current of this output terminal of flowing through according to transmission data and this first reference current; And
One receiving terminal circuit comprises:
One second outer meeting resistance;
One the 3rd outer meeting resistance; And
At least one receiver, each receiver wherein all has one second reference edge, one the 3rd reference edge and a receiving end, wherein this of at least one receiver second reference edge is coupled to this second outer meeting resistance, the 3rd reference edge is coupled to the 3rd outer meeting resistance, this receiving end is coupled to this output terminal of this transmitter, this receiver produces one second reference current according to this second outer meeting resistance, and it is poor to produce a reference voltage according to this second reference current and the 3rd outer meeting resistance, this receiver is then judged voltage on this receiving end according to this reference voltage difference, with these transmission data of correct reception
Wherein, this transmitter comprises:
One transmission ends current generating circuit is coupled to this first reference edge, in order to produce this first reference current according to this first outer meeting resistance; And
A plurality of pulse strength modulators, be coupled to this transmission ends current generating circuit and this output terminal, in order to bit code according to these transmission data, decide the proportionate relationship of electric current and this first reference current of this output terminal of flowing through, this terminal resistance produces a plurality of different voltage levels on this output terminal to arrange in pairs or groups
And wherein this receiver comprises:
One arrival current tracking circuit is coupled to this second reference edge and the 3rd reference edge, and in order to producing this second reference current according to this second outer meeting resistance, and it is poor to produce this reference voltage according to this second reference current and the 3rd outer meeting resistance;
One second bleeder circuit, in order to according to this reference voltage difference and one second predetermined ratio, it is poor to produce a plurality of sub-reference voltages;
A plurality of intensity comparers are coupled to this second bleeder circuit and this receiving end, and those intensity comparers are in order to compare the voltage on this receiving end and this a little reference voltage difference of part, to obtain many group heat sign indicating numbers; And
A plurality of hot sign indicating number demoders are coupled to those intensity comparers, in order to should organize hot yard these transmission data of decoding back more.
2. the point-to-point transmission system of many level as claimed in claim 1, wherein, this transmission ends current generating circuit comprises:
One first bleeder circuit in order to according to an input voltage and one first predetermined ratio, produces one first reference voltage;
One operational amplifier has a first input end, one second input end and an output terminal, and this first input end and first bleeder circuit couple, and this second input end and first reference edge couple; And
One current mirror is coupled to this output terminal and this first reference edge of this operational amplifier, in order to duplicating and to export this first reference current,
Wherein, this first reference current is produced by this first reference voltage and this first outer meeting resistance.
3. the point-to-point transmission system of many level as claimed in claim 1, wherein, this arrival current tracking circuit comprises:
One the 3rd bleeder circuit in order to according to an input voltage and one the 3rd predetermined ratio, produces one second reference voltage;
One operational amplifier has a first input end, one second input end and an output terminal, and this first input end and the 3rd bleeder circuit couple, and this second input end and second reference edge couple; And
One on-off circuit, have an enable signal receiving end, a current input terminal and a current output terminal, this current input terminal and second reference edge couple, this current output terminal and the 3rd reference edge couple, this enable signal receiving end receives the enable signal of an input, whether control exports second reference current to this current output terminal by this
Wherein, this second reference current produces according to this second reference voltage and this second outer meeting resistance.
4. the point-to-point transmission system of many level as claimed in claim 1, wherein, this receiver more comprises:
One voltage transitions level, have an output terminal and an input end, the input end of this voltage transitions level and the 3rd reference edge couple, and the output terminal of this voltage transitions level and this second bleeder circuit couple, in order to the voltage transitions of the 3rd reference edge this output terminal to this voltage transitions level.
5. the point-to-point transmission system of many level as claimed in claim 4, wherein, this voltage transitions level comprises:
One operational amplifier, the first input end of this operational amplifier are as the input end of this voltage transitions level, and second input end of this operational amplifier is as the output terminal of this voltage transitions level; And
One field-effect transistor, the grid of this field-effect transistor and the output terminal of this operational amplifier couple, and the output terminal of the drain electrode of this field-effect transistor and this voltage transitions level couples, the source ground of this field-effect transistor,
Wherein, the voltage of the input end of this voltage transitions level is copied to the output terminal of this voltage transitions level.
6. the point-to-point transmission system of many level as claimed in claim 3, wherein, this on-off circuit comprises:
One phase inverter, the input of this phase inverter and this enable signal receiving end couple, in order to this enable signal is anti-phase; And
First field-effect transistor and second field-effect transistor,
Wherein, the grid of the drain electrode of this second field-effect transistor and this first field-effect transistor couples, the grid of this second field-effect transistor and the output terminal of this phase inverter couple, the source ground of this second field-effect transistor, the grid of this first field-effect transistor and the output terminal of this operational amplifier couple, the drain electrode of this first field-effect transistor is the current output terminal of this on-off circuit, and the source electrode of this first field-effect transistor is the current input terminal of this on-off circuit.
7. the point-to-point transmission system of many level as claimed in claim 1, those pulse strength modulators are the circuit structure of single-ended input or feedback circuit structure with common modality.
8. the point-to-point transmission system of many level as claimed in claim 1, this transmission system is applied to large-sized display panel.
9. a transmission ends circuit is used for the point-to-point transmission system of level more than, and is coupled at least one terminal resistance, and this transmission ends circuit comprises:
One first outer meeting resistance; And
One transmitter has one first reference edge and at least one output terminal, and this first reference edge is coupled to this first outer meeting resistance, and this output terminal is coupled to this terminal resistance, and this transmitter comprises:
One transmission ends current generating circuit is coupled to this first reference edge, in order to produce one first reference current according to this first outer meeting resistance; And
A plurality of pulse strength modulators, be coupled to this transmission ends current generating circuit and this output terminal, in order to bit code according to transmission data, decide the proportionate relationship of electric current and this first reference current of this output terminal of flowing through, this terminal resistance produces a plurality of different voltage levels on this output terminal to arrange in pairs or groups.
10. transmission ends circuit as claimed in claim 9, wherein, this transmission ends current generating circuit comprises:
One first bleeder circuit in order to according to an input voltage and one first predetermined ratio, produces one first reference voltage;
One operational amplifier has a first input end, one second input end and an output terminal, and the first input end of this operational amplifier and first bleeder circuit couple, and second input end and first reference edge of this operational amplifier couple; And
One current mirror is coupled to this output terminal and this first reference edge of this operational amplifier, in order to duplicating and to export this first reference current,
Wherein, this first reference current produces according to this first reference voltage and this first outer meeting resistance.
11. transmission ends circuit as claimed in claim 9, those pulse strength modulators are the circuit structure of single-ended input or feedback circuit structure with common modality.
12. transmission ends circuit as claimed in claim 9, this transmission ends circuit application is in large-sized display panel.
13. a receiving terminal circuit is used for the point-to-point transmission system of level more than, this receiving terminal circuit comprises:
One second outer meeting resistance;
One the 3rd outer meeting resistance; And
At least one receiver, each receiver wherein all has one second reference edge, one the 3rd reference edge and a receiving end, wherein this of at least one receiver second reference edge is coupled to this second outer meeting resistance, and the 3rd reference edge is coupled to the 3rd outer meeting resistance, and this receiver comprises:
One arrival current tracking circuit is coupled to this second reference edge and the 3rd reference edge, and in order to producing one second reference current according to this second outer meeting resistance, and it is poor to produce a reference voltage according to this second reference current and the 3rd outer meeting resistance;
One second bleeder circuit, in order to according to this reference voltage difference and one second predetermined ratio, it is poor to produce a plurality of sub-reference voltages;
A plurality of intensity comparers are coupled to this second bleeder circuit and this receiving end, and those intensity comparers are in order to compare the voltage on this receiving end and this a little reference voltage difference of part, to obtain many group heat sign indicating numbers; And
A plurality of hot sign indicating number demoders are coupled to those intensity comparers, in order to should organize the hot yard transmission data of decoding back more.
14. receiving terminal circuit as claimed in claim 13, wherein, this arrival current tracking circuit comprises:
One the 3rd bleeder circuit in order to according to an input voltage and one the 3rd predetermined ratio, produces one second reference voltage;
One operational amplifier has a first input end, one second input end and an output terminal, and this first input end and the 3rd bleeder circuit couple, and this second input end and second reference edge couple; And
One on-off circuit, have an enable signal receiving end, a current input terminal and a current output terminal, this current input terminal and second reference edge couple, this current output terminal and the 3rd reference edge couple, this enable signal receiving end receives the enable signal of an input, whether control exports second reference current to this current output terminal by this
Wherein, this second reference current produces according to this second reference voltage and this second outer meeting resistance.
15. receiving terminal circuit as claimed in claim 13, wherein this receiver more comprises:
One voltage transitions level, have an output terminal and an input end, the input end of this voltage transitions level and the 3rd reference edge couple, and the output terminal of this voltage transitions level and this second bleeder circuit couple, in order to the voltage transitions of the 3rd reference edge this output terminal to this voltage transitions level.
16. receiving terminal circuit as claimed in claim 15, wherein, this voltage transitions level comprises:
One operational amplifier, the first input end of this operational amplifier are as the input end of this voltage transitions level, and second input end of this operational amplifier is as the output terminal of this voltage transitions level; And
One field-effect transistor, the grid of this field-effect transistor and the output terminal of this operational amplifier couple, and the output terminal of the drain electrode of this field-effect transistor and this voltage transitions level couples, the source ground of this field-effect transistor,
Wherein, the voltage of the input end of this voltage transitions level is copied to the output terminal of this voltage transitions level.
17. receiving terminal circuit as claimed in claim 14, wherein, this on-off circuit comprises:
One phase inverter, the input of this phase inverter and this enable signal receiving end couple, in order to this enable signal is anti-phase; And
First field-effect transistor and second field-effect transistor,
Wherein, the grid of the drain electrode of this second field-effect transistor and this first field-effect transistor couples, the grid of this second field-effect transistor and the output terminal of this phase inverter couple, the source ground of this second field-effect transistor, the grid of this first field-effect transistor and the output terminal of this operational amplifier couple, the drain electrode of this first field-effect transistor is the current output terminal of this on-off circuit, and the source electrode of this first field-effect transistor is the current input terminal of this on-off circuit.
18. receiving terminal circuit as claimed in claim 13, this receiving terminal circuit is applied to large-sized display panel.
19. a point-to-point signal transmission system comprises:
One transmission ends circuit is exported at least one current signal according to transmission data; And
One receiving terminal circuit is coupled to this transmission ends circuit, comprising:
A plurality of receiving elements receive this current signal that this transmission ends circuit is sent, and this current signal is converted to a reception voltage signal; And
At least one reference unit is coupled to those receiving elements, and is poor in order to produce a reference voltage, and this reference voltage difference is sent to those receiving elements;
Wherein, it is poor that those receiving elements produce a plurality of sub-reference voltages according to this reference voltage difference, and relatively receive voltage signal and this a little reference voltage difference obtaining a numerical data,
Wherein, this transmission ends circuit comprises:
One first outer meeting resistance;
One first reference edge is coupled to this outer meeting resistance;
One transmission ends current generating circuit is coupled to this first reference edge, in order to produce one first reference current according to this first outer meeting resistance; And
One pulse strength modulator is coupled at least one output terminal of this transmission ends current generating circuit and this transmission ends circuit, determines the proportionate relationship of current value and this first reference current of this current signal according to the bit code of these transmission data,
And wherein, this receiving element comprises:
One current/voltage switching stage is made up of a plurality of resistance, in order to this current signal is converted to this reception voltage signal;
One second bleeder circuit, in order to according to this reference voltage difference and one second predetermined ratio, it is poor to produce a plurality of sub-reference voltages;
A plurality of intensity comparers are coupled to this current/voltage switching stage and this second bleeder circuit, and those intensity comparers are poor with part this a little reference voltage in order to the magnitude of voltage of this voltage signal relatively, to obtain many group heat yard; And
A plurality of heat sign indicating number demoders are coupled to those intensity comparers, in order to should decoding by many group heat sign indicating numbers, and obtaining this numerical data,
And wherein, this reference unit comprises:
One second outer meeting resistance;
One the 3rd outer meeting resistance;
One second reference edge is coupled to this second outer meeting resistance;
One the 3rd reference edge is coupled to the 3rd outer meeting resistance; And
One arrival current tracking circuit is coupled to this second reference edge and the 3rd reference edge, and in order to producing one second reference current according to this second outer meeting resistance, and it is poor to produce this reference voltage according to this second reference current and the 3rd outer meeting resistance.
20. point-to-point signal transmission system as claimed in claim 19, wherein, this transmission ends current generating circuit comprises:
One first bleeder circuit in order to according to an input voltage and one first predetermined ratio, produces one first reference voltage;
One operational amplifier has a first input end, one second input end and an output terminal, and this first input end and first bleeder circuit couple, and this second input end and first reference edge couple; And
One current mirror is coupled to this output terminal and this first reference edge of this operational amplifier, in order to duplicating and to export this first reference current,
Wherein, this first reference current produces according to this first reference voltage and this first outer meeting resistance.
21. point-to-point signal transmission system as claimed in claim 19, wherein, this arrival current tracking circuit comprises:
One the 3rd bleeder circuit in order to according to an input voltage and one the 3rd predetermined ratio, produces one second reference voltage;
One operational amplifier has a first input end, one second input end and an output terminal, and this first input end and the 3rd bleeder circuit couple, and this second input end and second reference edge couple; And
One on-off circuit, have an enable signal receiving end, a current input terminal and a current output terminal, this current input terminal and second reference edge couple, this current output terminal and the 3rd reference edge couple, this enable signal receiving end receives the enable signal of an input, whether control exports second reference current to this current output terminal by this
Wherein, this second reference current produces according to this second reference voltage and this second outer meeting resistance.
22. point-to-point signal transmission system as claimed in claim 19, wherein, this reference unit more comprises:
One voltage transitions level, have an output terminal and an input end, the input end of this voltage transitions level and the 3rd reference edge couple, and the output terminal of this voltage transitions level and this second bleeder circuit couple, in order to the voltage transitions of the 3rd reference edge this output terminal to this voltage transitions level.
23. point-to-point signal transmission system as claimed in claim 19, wherein, this receiving element more comprises:
One voltage transitions level, have an output terminal and an input end, the input end of this voltage transitions level and the 3rd reference edge couple, and the output terminal of this voltage transitions level and this second bleeder circuit couple, in order to the voltage transitions of the 3rd reference edge this output terminal to this voltage transitions level.
24. point-to-point signal transmission system as claimed in claim 23, wherein, this voltage transitions level comprises:
One operational amplifier, the first input end of this operational amplifier are as the input end of this voltage transitions level, and second input end of this operational amplifier is as the output terminal of this voltage transitions level; And
One field-effect transistor, the grid of this field-effect transistor and the output terminal of this operational amplifier couple, and the output terminal of the drain electrode of this field-effect transistor and this voltage transitions level couples, the source ground of this field-effect transistor,
Wherein, the voltage of the input end of this voltage transitions level is copied to the output terminal of this voltage transitions level.
25. point-to-point signal transmission system as claimed in claim 21, wherein, this on-off circuit comprises:
One phase inverter, the input of this phase inverter and this enable signal receiving end couple, in order to this enable signal is anti-phase; And
First field-effect transistor and second field-effect transistor,
Wherein, the grid of the drain electrode of this second field-effect transistor and this first field-effect transistor couples, the grid of this second field-effect transistor and the output terminal of this phase inverter couple, the source ground of this second field-effect transistor, the grid of this first field-effect transistor and the output terminal of this operational amplifier couple, the drain electrode of this first field-effect transistor is the current output terminal of this on-off circuit, and the source electrode of this first field-effect transistor is the current input terminal of this on-off circuit.
26. point-to-point signal transmission system as claimed in claim 19, the feedback circuit structure that this pulse strength modulator can be the circuit structure of single-ended input or has common modality.
27. point-to-point signal transmission system as claimed in claim 19, this point-to-point signal transmission system can be applicable to large-sized display panel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101629928A CN101409036B (en) | 2007-10-09 | 2007-10-09 | Multi-level point-to-point transmission system as well as transmission terminal circuit and receiving terminal circuit thereof |
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| CN2007101629928A CN101409036B (en) | 2007-10-09 | 2007-10-09 | Multi-level point-to-point transmission system as well as transmission terminal circuit and receiving terminal circuit thereof |
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| US9310644B2 (en) | 2013-03-11 | 2016-04-12 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Liquid crystal display, LED backlight source, and the driving method thereof |
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| CN1581696A (en) * | 2003-08-13 | 2005-02-16 | 罗姆股份有限公司 | Receiving device and transmission device using same |
| CN1617579A (en) * | 2003-11-13 | 2005-05-18 | 上海交通大学 | Signal transmission method in digital TV ground broadcast transmission system |
| JP2007233415A (en) * | 2007-05-31 | 2007-09-13 | Nec Electronics Corp | Semiconductor integrated circuit device for driving display panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1581696A (en) * | 2003-08-13 | 2005-02-16 | 罗姆股份有限公司 | Receiving device and transmission device using same |
| CN1617579A (en) * | 2003-11-13 | 2005-05-18 | 上海交通大学 | Signal transmission method in digital TV ground broadcast transmission system |
| JP2007233415A (en) * | 2007-05-31 | 2007-09-13 | Nec Electronics Corp | Semiconductor integrated circuit device for driving display panel |
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