CN100562917C - Voltage conversion device with nonlinear gain - Google Patents
Voltage conversion device with nonlinear gain Download PDFInfo
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Abstract
The voltage conversion device with nonlinear gain is used for converting an analog voltage output by an analog voltage source and comprises a gain determining module, a voltage selecting module and a voltage output module. The gain determining module comprises an analog-to-digital converter coupled to the analog voltage source and a gain selector coupled to the analog-to-digital converter for determining an output gain. The voltage selection module is coupled to the analog voltage source and the analog-to-digital converter and used for selectively outputting a direct current voltage according to a plurality of direct current voltages. The voltage output module is used for outputting the amplification result of the direct current voltage output by the voltage selection module according to the output gain judged by the gain selector.
Description
Technical field
The present invention relates to a kind of voltage conversion device, relate in particular to a kind of voltage conversion device with non-linear gain.
Background technology
LCD has that external form is frivolous, power consumption is few and characteristic such as radiationless pollution, has been widely used on the information products such as computer system, mobile phone, PDA(Personal Digital Assistant).The principle of work of LCD is to utilize liquid crystal molecule under different ordered states, light had different polarizations or refraction effect, therefore can control the amount of penetrating of light via the liquid crystal molecule of different ordered states, further produce the output light of varying strength, and the red, green, blue of different GTG intensity.
Please refer to Fig. 1, Fig. 1 is known thin film transistor (TFT) (Thin Film Transistor, TFT) synoptic diagram of LCD 10.LCD 10 comprises a display panels (LCD Panel) 100, one control circuit 102, a data line signal output circuit 104, one scan line signal output apparatus 106 and a voltage generator 108.Display panels 100 is made of two substrates (Substrate), and is filled with liquid crystal material (LCD layer) between two substrates.One substrate is provided with many data lines (DataLine) 110, many (the Scan Line of the sweep trace perpendicular to data line 110, or weighlock line, Gate Line) 112 and a plurality of thin film transistor (TFT) 114, and being provided with a public electrode (CommonElectrode), another substrate is used for providing a common electric voltage (Vcom) via voltage generator 108.For ease of explanation, only show four thin film transistor (TFT)s 114 among Fig. 1, in fact, each data line 110 all is connected with a thin film transistor (TFT) 114 with the junction (Intersection) of sweep trace 112 in the display panels 100, that is thin film transistor (TFT) 114 is distributed on the display panels 100 in the mode of matrix, each data line 110 is corresponding to row (Column) of Thin Film Transistor-LCD 10, and sweep trace 112 is corresponding to the delegation (Row) of Thin Film Transistor-LCD 10, and each thin film transistor (TFT) 114 is corresponding to a pixel (Pixel).In addition, the circuit characteristic that two substrates constituted of display panels 100 can be considered an equivalent electric capacity 116.
Details are as follows for the drive principle of known Thin Film Transistor-LCD 10, when control circuit 102 receives horizontal-drive signal (Horizontal Synchronization) 118 and vertical synchronizing signal (Vertical Synchronization) 120, control circuit 102 can produce corresponding control signal and input to data line signal output circuit 104 and scanning-line signal output circuit 106 respectively, data line signal output circuit 104 and scanning-line signal output circuit 106 can produce input signal to different data line 110 and sweep trace 112 according to this control signal then, thereby the potential difference (PD) at the conducting of control TFT 114 and equivalent capacity 116 two ends, and change the arrangement and the corresponding light penetration amount of liquid crystal molecule further, so that video data 122 is shown on the panel.For instance, 106 pairs of sweep traces of scanning-line signal output circuit, 112 inputs, one pulse wave makes thin film transistor (TFT) 114 conductings, therefore the signal of 104 input data lines 110 of data line signal output circuit can be imported equivalent capacity 116 via thin film transistor (TFT) 114, therefore reaches GTG (Gray Level) state of the corresponding pixel of control.In addition, input to the signal magnitude of data line 110, can produce different GTG sizes by control data line signal output apparatus 104.
In known technology, can reduce EMI under the high speed operation and save power consumption, the voltage level amplitude of oscillation that video data 122 is exported very little usually (as 0.1V to 1V) in order to reach.Therefore, the signal that data line signal output circuit 104 is imported can be converted to preset range with the voltage level amplitude of oscillation with data line signal through a voltage conversion circuit, thus colourity (Chrominance), the brightness (Luminance) of control respective pixel.For instance, please refer to Fig. 2, Fig. 2 is the synoptic diagram of a known voltage change-over circuit 20.Voltage conversion circuit 20 includes an operational amplifier 200 and resistance 202,204, and the input end 206 of operational amplifier 200 is coupled to the output terminal of video data 122, and output terminal 208 is coupled to the input end of data line signal output circuit 104.As known to persons of ordinary skill in the art, if operational amplifier 200 is an ideal operational amplificr (gain infinitely great), and the resistance value of resistance 202,204 is R1, R2, and the gain of voltage conversion circuit 20 is (1+R2/R1) as can be known.In other words, the input of voltage conversion circuit 20 and output voltage are a linear relationship.
Therefore, the data-signal that video data 122 is exported can be sent to data line signal output circuit 104 by behind voltage conversion circuit 20 linear amplification.In this case, by known voltage change-over circuit 20, the data line signal that data line signal output circuit 104 is exported only can be amplified to the working range of thin film transistor (TFT) 114 linearly, make the different GTGs that Thin Film Transistor-LCD 10 is presented and the close straight line that is similar to of brightness, thereby influence picture gradually the layer effect, cause image the nature.
Summary of the invention
Therefore, fundamental purpose of the present invention is to provide a kind of voltage conversion device with non-linear gain.
The present invention discloses a kind of voltage conversion device with non-linear gain, and in order to change the aanalogvoltage that an analog voltage source is exported, this voltage conversion device includes a gain decision module, a voltage is selected a module and a voltage output module.This decision module that gains includes an analog-to-digital converter, is coupled to this analog voltage source, is used for the aanalogvoltage that this analog voltage source is exported is converted to digital signal; And a gain selector switch, be coupled to this analog-to-digital converter, be used for the digital signal exported according to this analog-to-digital converter, judge an output gain.This voltage selects module to be coupled to this analog voltage source and this analog-to-digital converter, be used for the digital signal that the aanalogvoltage exported according to this analog voltage source and this analog-to-digital converter export, select output one direct current voltages by a plurality of DC voltage.This voltage output module includes a first input end and an output terminal is coupled to this gain selector switch, and one second input end is coupled to this voltage selection module, be used for the output gain judged according to this gain selector switch, export the amplification result that this voltage is selected the DC voltage that module exports by this output terminal.
The present invention discloses a kind of voltage conversion device with non-linear gain in addition, and in order to change the aanalogvoltage that an analog voltage source is exported, this voltage conversion device includes a gain decision module, a voltage is selected a module and a voltage output module.This gain decision module includes an analog-to-digital converter, is coupled to this analog voltage source, is used for the aanalogvoltage that this analog voltage source is exported is converted to digital signal; And a gain selector switch, be coupled to this analog-to-digital converter, be used for the digital signal exported according to this analog-to-digital converter, judge an output gain.This voltage selects module to be coupled to this gain selector switch, is used for the digital signal exported according to this analog-to-digital converter, selects to export direct current voltages to this selector switch that gains by a plurality of DC voltage.This voltage output module includes a first input end and an output terminal is coupled to this gain selector switch, and one second input end is coupled to this analog voltage source, be used for the output gain judged according to this gain selector switch, export the amplification result of the aanalogvoltage that this analog voltage source exports by this output terminal.
Description of drawings
Fig. 1 is the synoptic diagram of known Thin Film Transistor-LCD.
Fig. 2 is the synoptic diagram of known voltage change-over circuit.
Fig. 3 is the synoptic diagram of one embodiment of the invention voltage conversion device.
Fig. 4 is the synoptic diagram of an analog-to-digital converter.
Fig. 5 is the synoptic diagram of a gain selector switch.
Fig. 6 is the synoptic diagram of a gain selector switch
Fig. 7 is the synoptic diagram that a voltage is selected module.
Fig. 8 is the synoptic diagram that a voltage is selected module.
Fig. 9 is the synoptic diagram of the aanalogvoltage exported of an analog voltage source.
Figure 10 is the change in gain synoptic diagram of the output voltage of voltage conversion device among Fig. 3 corresponding to the aanalogvoltage of Fig. 9.
Figure 11 is the synoptic diagram of one embodiment of the invention voltage conversion device.
Figure 12 is the synoptic diagram of the aanalogvoltage exported of an analog voltage source.
Figure 13 is the synoptic diagram of the expection output voltage of a voltage conversion device corresponding to the change in gain of the aanalogvoltage of Figure 12.
Figure 14 is that aanalogvoltage among Figure 12 is through the synoptic diagram of the voltage waveform after the reversal of poles.
Figure 15 is the synoptic diagram of the expection output voltage of a voltage conversion device corresponding to the change in gain of the aanalogvoltage of Figure 14.
Figure 16 is the synoptic diagram of an analog-to-digital converter.
Figure 17 is the synoptic diagram of a gain selector switch.
Figure 18 is the truth table of the gain selector switch of Figure 17.
Figure 19 is the synoptic diagram of a gain selector switch.
Figure 20 is the truth table of the gain selector switch of Figure 19.
Figure 21 is the synoptic diagram that a voltage is selected module.
Figure 22 is the truth table that the voltage of Figure 21 is selected module.
Figure 23 is the synoptic diagram that a voltage is selected module.
Figure 24 is the truth table that the voltage of Figure 23 is selected module.
Figure 25 is the synoptic diagram of one embodiment of the invention voltage conversion device.
Figure 26 is the synoptic diagram of Figure 25 one gain selector switch.
Figure 27 is the synoptic diagram of Figure 25 one gain selector switch.
Figure 28 is the synoptic diagram of one embodiment of the invention voltage conversion device.
Figure 29 is the synoptic diagram of Figure 28 one gain selector switch.
Figure 30 is the synoptic diagram of Figure 28 one gain selector switch.
[description of reference numerals]
10 Thin Film Transistor-LCDs
100 display panels
102 control circuits
104 data line signal output circuits
106 scanning-line signal output circuits
108 voltage generators
110 data lines
112 sweep traces
114 thin film transistor (TFT)s
116 equivalent capacitys
118 horizontal-drive signals
120 vertical synchronizing signals
122 video datas
20 voltage conversion circuits
200 operational amplifiers
206 input ends
208 output terminals
30,1100,250,2800 voltage conversion devices
32,1132 gain decision module
34,1134 voltages are selected module
36,1136 voltage output modules
320,11320 analog-to-digital converters
322,11322,25322,28322 gain selector switchs
360,11360 first input ends
362,11,362 second input ends
364,11364 output terminals
CMP1～CMPn comparer
Vr (1)～Vr (n) reference voltage
400,1600 digital decoders
D0, D1, D (n) digital signal
500,700,1700,2100,2600,2,900 first signal ends
502,702,1702,2102,2602,2902 secondary signal ends
504,1704 the 3rd signal ends
506,704,1706,2104,2606,2,906 first resistance units
610,1910,2300 decoding modules
T1, t2...tn voltage turning point
1138 voltage receiver modules
11380 reversal of poles modules
POL, POLB polarity selection signal
R1、R2、R(1)～R(4)、202、204、R50_1～R50_n、R70_1～R70_n、
R260_1～R260_n resistance
Vi、Vo、Vcom、Vdc(1)～Vdc(n)、Vdc(1)b～Vdc(n)b、Vt1、Vt2...Vtn、
V1、Vx、Vy、V2、V1’、Vx’、Vy’、V2’、Vo1、Vox、Voy、Vo2、Vo1’、
Vox ', Voy ', Vo2 ' voltage
SW50_1～SW50_n、SW70_1～SW70_n、11382、11384、
SW260_1～SW260_n switch element
508、608、1708、1908、2106、2306、706、806、2608、
2708,2908,3008 resistance value decision module
1710、1712、1714、1716、1718、1720、1900、1902、1904、1906、2110、
2112、2114、2116、2118、2120、2122、2124、2126、2128、2130、2132、
2134、2136、2310、2312、2314、2316、2322、2324、2326、2328、2330、
2332,2334,2336 switches
Embodiment
Please refer to Fig. 3, Fig. 3 is the synoptic diagram of one embodiment of the invention voltage conversion device 30.The aanalogvoltage Vi that voltage conversion device 30 is exported in order to change an analog voltage source, this analog voltage source can be the video data in the flat-panel screens.Voltage conversion device 30 includes a gain decision module 32, a voltage is selected a module 34 and a voltage output module 36.Gain decision module 32 is used for dynamically selecting different gains according to the size of aanalogvoltage Vi, and it includes an analog-to-digital converter 320 and a gain selector switch 322.Analog-to-digital converter 320 is in order to be converted to digital signal with aanalogvoltage Vi, and the digital signal that gain selector switch 322 is then exported according to analog-to-digital converter 320 is judged an output gain.The digital signal that voltage selects module 34 to be exported according to aanalogvoltage Vi and analog-to-digital converter 320 selects a direct current voltage to export voltage output module 36 to by a plurality of DC voltage Vdc (n).Voltage output module 36 preferably is a negative-feedback circuit of being made up of operational amplifier, it includes a first input end 360, one second input end 362 and an output terminal 364, output gain in order to be judged according to gain selector switch 322 amplifies the DC voltage that voltage selects module 34 to be exported.In other words, gain decision module 32 usefulness decide the gain between the output voltage V o of voltage output module 36 and aanalogvoltage Vi that analog voltage source is exported, and voltage selection module 34 is then with the translational movement that decides output voltage V o.
For clearly demonstrating, below the detailed architecture of each module in the voltage conversion device 30 is described earlier, its function mode is described again.
At first, please refer to Fig. 4, Fig. 4 is the synoptic diagram of analog-to-digital converter 320.Analog-to-digital converter 320 includes a comparator C MP1～CMPn and a digital decoder 400.Comparator C MP1～CMPn is used for comparison aanalogvoltage Vi and reference voltage Vr (1)～Vr (n), and exports comparative result to digital decoder 400.The comparative result that digital decoder 400 can be exported according to comparator C MP1～CMPn is exported a digital signal D (n).
Please refer to Fig. 5, Fig. 5 is the synoptic diagram of gain selector switch 322.Gain selector switch 322 includes one first signal end 500, a secondary signal end 502, one the 3rd signal end 504, one first resistance unit 506 and a resistance value decision module 508.First resistance unit 506 is between first signal end 500 and secondary signal end 502, and it can be fixed value resistance, variable resistor etc.The digital signal D (n) that resistance value decision module 508 can be exported according to analog-to-digital converter 320, by resistance R 50_1～R50_n and switch element SW50_1～SW50_n, the resistance sizes that decision secondary signal end 502 and the 3rd signal end are 504.Resistance R 50_1～R50_n is coupled to the 3rd signal end 504, the digital signal D (n) that switch element SW50_1～SW50_n can be exported according to analog-to-digital converter 320, the binding of 502 at resistance and secondary signal end among conducting resistance R50_1～R50_n.For correctly providing 36 runnings of voltage output module required gain, first signal end 500 can be coupled to one and systematically hold GND, secondary signal end 502 is coupled to the first input end 360 of voltage output module 36, and the output terminal 364 that the 3rd signal end 504 is coupled to voltage output module 36; Perhaps, first signal end 500 is coupled to the output terminal 364 of voltage output module 36, secondary signal end 502 is coupled to the first input end 360 of voltage output module 36, and the 3rd signal end 504 is coupled to systematically holds GND.
In Fig. 5, each switch element all includes the switch that equals the figure place that digital signal D (n) comprised among switch element SW50_1～SW50_n.In other words, in the application of some higher-order, the figure place that digital signal D (n) is comprised more for a long time, the switch number that each switch element comprised among switch element SW50_1～SW50_n is relatively also more, makes circuit complexity increase.Therefore, the present invention provides a resistance value decision module 608 in order to replace resistance value decision module 508 in addition, please refer to Fig. 6.The function mode of resistance value decision module 608 is similar to the resistance value decision module 508 of Fig. 5, wherein the digital signal D (n) that exported of analog-to-digital converter 320 can be earlier through a decoding module 610, be decoded as a plurality of digital signals, just input to corresponding switch.In this case, resistance value decision module 608 required switch numbers lack than resistance value decision module 508 required switch numbers, thereby save circuit cost.
Please refer to Fig. 7, Fig. 7 selects the synoptic diagram of module 34 for voltage.Voltage selects module 34 to include one first signal end 700, a secondary signal end 702, one first resistance unit 704 and a resistance value decision module 706.First signal end 700 and secondary signal end 702 are respectively coupled to second input end 362 of analog voltage source and voltage output module 36,704 of first resistance units are between first signal end 700 and secondary signal end 702, and it can be fixed value resistance, variable resistor etc.The digital signal D (n) of resistance value decision module 706 in order to be exported according to analog-to-digital converter 320, by switch element SW70_1～SW70_n with the direct current voltage that determines DC voltage Vdc (1)～Vdc (n) to secondary signal end 702 with and the resistance of corresponding resistance R 701～R70n.Please refer to Fig. 8, can a resistance value decision module 806 replace resistance value decision module 706 to save circuit cost in addition, its function mode is similar to resistance value decision module 608 shown in Figure 6, does not give unnecessary details at this.
Therefore, in voltage conversion device 30, voltage output module 36 according to the gain that gain selects module 322 to be determined, amplifies the voltage that voltage selects module 34 to be exported with negative feedback mode.By voltage conversion device 30 of the present invention, those of ordinary skills can be according to required voltage turnover (being specified in the back), determine suitable reference voltage Vr (1)～Vr (n), DC voltage Vdc (the 1)～size of Vdc (n) and the resistance value of resistance R 50_1～R50_n, R70_1～R70_n, and then the digital signal D (n) that is exported by analog-to-digital converter 320, the unlatching of control switch unit SW50_1～SW50_n and SW70_1～SW70_n or close is to determine required voltage gain.For instance, please refer to Fig. 9 and Figure 10, the synoptic diagram of the aanalogvoltage Vi that Fig. 9 exports for analog voltage source, Figure 10 are the synoptic diagram of the output voltage V o of voltage output module 36 corresponding to aanalogvoltage Vi.By Fig. 9 and Figure 10 as can be known, the voltage range of aanalogvoltage Vi is between V1 to V2, if required output voltage turning point t1, the pairing voltage of t2...tn is Vt1, Vt2...Vtn, then can be by control reference voltage Vr (1)～size of Vr (n) and the resistance value of resistance R 50_1～R50_n, R70_1～R70_n, reach as shown in figure 10 output voltage V o to the gain change graph of input voltage Vi.That is to say that voltage conversion device 30 has non-linear gain.
In known technology, the gain of voltage conversion circuit can be required that approaching more linearity is good more.Yet some special applications can require non-linear gain.For instance, for the display data signal of LCD, different brightness have different identification effects to the identification capability of human eye to different GTGs.By the present invention, voltage conversion device 30 can be according to different input display data voltage, the output voltage that different gains is provided is to the data line signal output circuit, makes GTG and the brightness that the exportable suitable human eye of data line signal output circuit of LCD is viewed and admired.Thus, the GTG display characteristic that LCD presented is similar to the identification capability of human eye to brightness, and the image that then user experienced is more natural.
Yet,, also need consider the problem that the polarity of output voltage need be reversed for LCD.In LCD,, make the deterioration that picture shows if use positive voltage or negative voltage constantly to drive liquid crystal molecule can to reduce the polarization or the refraction effect of liquid crystal molecule always to light.Therefore, for the destruction of protecting liquid crystal molecule not to be subjected to driving voltage, must use positive-negative polarity voltage alternant way to drive liquid crystal molecule.In addition, display panels is except comprising equivalent capacity, circuit itself also can produce stray capacitance (Parasitic Capacitor), so when same image showed on display panels when of a specified duration, stray capacitance can produce ghost phenomena (Residual Image Effect) because of store charge, more can influence the demonstration of follow-up picture, so also must utilize positive-negative polarity voltage alternant way to drive liquid crystal molecule to improve the influence of stray capacitance, as row reverse drive (Line Inversion) to image output, single-point reverse drive (Dot Inversion) etc.That is to say that the polarity of the data line signal that the data line signal output circuit is exported should in time be reversed, damage to avoid ghost or liquid crystal molecule.Therefore, the present invention provides a display data voltage conversion equipment that is used for LCD in addition.
Please refer to Figure 11, Figure 11 is the synoptic diagram of one embodiment of the invention voltage conversion device 1100.The aanalogvoltage Vi that voltage conversion device 1100 is exported in order to change an analog voltage source, this analog voltage source can be the video data of a LCD.Voltage conversion device 1100 includes a gain decision module 1132, a voltage is selected module 1134, a voltage output module 1136 and a voltage receiver module 1138.Gain decision module 1132 is used for dynamically selecting different gains according to the size of aanalogvoltage Vi, and it includes an analog-to-digital converter 11320 and a gain selector switch 11322.Analog-to-digital converter 11320 is in order to be converted to digital signal with aanalogvoltage Vi, and the digital signal that gain selector switch 11322 is then exported according to analog-to-digital converter 11320 is judged an output gain.The digital signal that voltage selects module 1134 to be exported according to reverse voltage and the analog-to-digital converter 11320 of a polarity selection signal POL, aanalogvoltage Vi or aanalogvoltage Vi selects a direct current voltage to export voltage output module 1136 to by a plurality of DC voltage Vdc (n).Voltage output module 1136 preferably is a negative-feedback circuit of being made up of operational amplifier, it includes a first input end 11360, one second input end 11362 and an output terminal 11364, output gain in order to be judged according to gain selector switch 11322 amplifies the DC voltage that voltage selects module 1134 to be exported.In other words, gain decision module 1132 usefulness decide the gain between the output voltage V o of voltage output module 1136 and aanalogvoltage Vi that analog voltage source is exported, and voltage selection module 1134 is then with the translational movement that decides output voltage V o.
In Figure 11, voltage receiver module 1138 is used for receiving an aanalogvoltage Vi and the direct current voltage Vdc that voltage source is exported, and, aanalogvoltage Vi is converted to exports voltage to after the suitable polarity and select module 1134 according to polarity selection signal POL (and polarity selection signal POL reverse signal POLB).Voltage receiver module 1138 includes a reversal of poles module 11380 and switch element 11382,11384.Reversal of poles module 11380 includes resistance R 1, R2 and an operational amplifier 11386, the polarity of the aanalogvoltage Vi that the analog voltage source that is used for reversing is exported.Switch element 11382 is coupled to reversal of poles module 11380 and voltage and selects between the module 1134, is used for reverse signal POLB according to polarity selection signal POL, the binding of conducting reversal of poles module 11380 and 1134 of voltage selection modules.In addition, 11384 of switch elements are coupled to analog voltage source and voltage is selected to be used for according to polarity selection signal POL between the module 1134, and conducting analog voltage source and voltage are selected the binding of 1134 of modules.In other words, when polarity selection signal POL is high state (signal POLB is low state), voltage selects module 1134 to carry out follow-up running according to aanalogvoltage Vi.On the contrary, when polarity selection signal POL is low state (signal POLB is a high state), voltage selection module 1134 is carried out follow-up running according to the reverse voltage of aanalogvoltage Vi.
In voltage conversion device 1100, the function mode of gain decision module 1132 and voltage output module 1136 and gain decision module 32 and voltage output module 36 shown in Figure 3 are identical, tool common knowledge in this area is when can not giving unnecessary details at this with reference to figure 4 to Fig. 6 to realize gain decision module 1132 and voltage output module 1136.In addition, voltage selects 1134 need of module to select to increase in the module 34 (as shown in Figures 7 and 8) a plurality of switch elements in voltage, be respectively coupled to the resistance value decision module and a plurality of direct voltage source gets final product, with according to polarity selection signal POL (and polarity selection signal POL reverse signal POLB), the binding between a plurality of direct voltage sources of conducting and resistance value decision module (related embodiment will be that example explains with Figure 21 and Figure 23).
As voltage conversion device 30, voltage conversion device 1100 can input to the resistance value that the size of reference voltage of analog-to-digital converter 11320 and gain selector switch 11322 and voltage are selected each resistance in the module 1134 by control, reaches as shown in figure 10 output voltage V o to the gain change graph of input voltage Vi.That is to say that voltage conversion device 1100 has non-linear gain.In addition, can pass through polarity selection signal POL, the non-linear gain of control voltage conversion device 1100 output opposite polarities.
Therefore, by adjusting the quantity and the value of each assembly in the voltage conversion device 1100, can get required gain trace.For instance, please refer to Figure 12 and Figure 13.The synoptic diagram of the aanalogvoltage Vi that Figure 12 exports for analog voltage source, Figure 13 are the synoptic diagram of the output voltage V o of required (expection) corresponding to aanalogvoltage Vi.By Figure 12 and Figure 13 as can be known, the voltage range of aanalogvoltage Vi is between V1 to V2, if required output voltage turning point x, the pairing voltage of y is Vx, Vy, then can input to resistance value and DC voltage Vdc, Vdc (the 1)～Vdc (n) that the size of reference voltage Vref of analog-to-digital converter 11320 and gain selector switch 11322 and voltage are selected each resistance in the module 1134, reach as shown in figure 13 output voltage V o the gain change graph of input voltage Vi by control.Simultaneously, when the reverse signal POLB of polarity selection signal POL is enabled, then input to voltage that voltage selects module 1134 promptly as shown in figure 14.At this moment, the output voltage V o of voltage conversion device 1100 to the change in gain of input voltage Vi promptly as shown in figure 15.That is the gain of voltage conversion device 1100 shows as reverse and non-linear.
By adjusting the quantity and the value of each assembly in the voltage conversion device 1100, can reach the change in gain of Figure 13 and Figure 15.At first, please refer to Figure 16, Figure 16 is the synoptic diagram of analog-to-digital converter 11320.In order to reach Figure 13 and change in gain shown in Figure 15, analog-to-digital converter 11320 includes four comparator C MP1～CMP4 and a digital decoder 1600.The comparative result that digital decoder 1600 can be exported according to comparator C MP1～CMP4, output digital signal D0, D1.
Please refer to Figure 17, Figure 17 is the synoptic diagram of gain selector switch 11322.Gain selector switch 11322 includes one first signal end 1700, a secondary signal end 1702, one the 3rd signal end 1704, one first resistance unit 1706 and a resistance value decision module 1708, the gain selector switch 322 of its function mode such as Fig. 5 is similar, does not give unnecessary details at this.Wherein, for reaching the change in gain of Figure 13 and Figure 15, resistance value decision module 1708 comprises four resistance R (1)～R (4) and switch 1710,1712,1714,1716,1718,1720.Switch 1710 is driven by digital signal D1; Switch 1712 is driven by the reverse signal of digital signal D1; Switch 1714,1718 is driven by digital signal D0; Switch 1716,1720 is driven by the reverse signal of digital signal D0.That is to say that the mode of operation of resistance value decision module 1708 is shown in the truth table of Figure 18.What pay special attention to is that the gain selector switch 11322 of Figure 17 is derived according to the gain selector switch 322 of Fig. 5 and got.In addition, also can form a resistance value decision module 1908 and replace resistance value decision module 1708, please refer to Figure 19 according to the resistance value decision module 608 of Fig. 6.Resistance value decision module 1908 includes four resistance R (1)～R (4), switch 1900,1902,1904,1906 and a decoding module 1910.Decoding module 1910 can be decoded as digital signal D0, D1 digital signal D (1), D (2), D (3) and D (4), is used for the open and close of gauge tap 1900,1902,1904,1906 respectively.In this case, the mode of operation of resistance value decision module 1908 is shown in the truth table of Figure 20.
Please refer to Figure 21, Figure 21 selects the synoptic diagram of module 1134 for voltage.Voltage selects module 1134 to include one first signal end 2100, a secondary signal end 2102, one first resistance unit 2104 and a resistance value decision module 2106, and its function mode selects module 34 similar to the voltage of Fig. 7.Wherein, resistance value decision module 2106 includes four resistance R (1)～R (4) and switch 2110,2112,2114,2116,2118,2120,2122,2124,2126,2128,2130,2132,2134,2136.Switch 2110 is driven by digital signal D1; Switch 2112 is driven by the reverse signal of digital signal D1; Switch 2114,2118 is driven by digital signal D0; Switch 2116,2120 is driven by the reverse signal of digital signal D0; Switch 2122,2124,2126,2128 is driven by polarity selection signal POL; Switch 2130,2132,2134,2136 is driven by the inversion signal POLB of polarity selection signal POL.That is to say that the mode of operation of resistance value decision module 2106 is shown in the truth table of Figure 22.The voltage selection module 1134 of Figure 21 is derived according to the voltage selection module 34 of Fig. 7 and is got.In addition, also can form a resistance value decision module 2306 and replace resistance value decision module 2106, please refer to Figure 23 according to the resistance value decision module 806 of Fig. 8.Resistance value decision module 2306 includes four resistance R (1)～R (4), switch 2310,2312,2314,2316,2322,2324,2326,2328,2330,2332,2334,2336 and a decoding module 2300.Decoding module 2300 can be decoded as digital signal D0, D1 number for signal D (1), D (2), D (3) and D (4), is used for the open and close of gauge tap 2310,2312,2314,2316 respectively.Switch 2322,2324,2326,2328 is driven by polarity selection signal POL; Switch 2330,2332,2334,2336 is driven by the inversion signal POLB of polarity selection signal POL.In this case, the mode of operation of resistance value decision module 2306 is shown in the truth table of Figure 24.
Therefore, by the video data of voltage conversion device 1100 conversions one LCD, the not only exportable GTG that is close to human eye to the brightness identification capability of LCD, the gradually layer effect of lifting picture makes the more approaching nature of image.In addition, by control polarity selection signal POL (and reverse signal POLB), voltage conversion device 1100 can change the polarity of output signal according to this, the deterioration that causes picture to show to avoid LCD to use positive polarity voltage or reverse voltage constantly to drive liquid crystal molecule always, and then avoid ghost phenomena or liquid crystal molecule to damage.
By voltage conversion device of the present invention, those of ordinary skills can set the value of each assembly according to required gain trace.For instance, in Figure 12 and Figure 13, if the characteristic of required gain trace is: V1=0.1V, Vx=0.2V, Vy=0.9V, V2=1V, Vo1=0.1V, Vox=1V, Voy=4V, Vo2=4.9V, then in Figure 16, set Vr (1)=0.1V, Vr (2)=0.2V, Vr (3)=0.9V, Vr (4)=1V; In Figure 17 and Figure 11, first signal end 1700 connects the output terminal 11364 of voltage output module 1136, and secondary signal end 1702 connects first input end 11360, the three signal ends 1704 of voltage output module 1136 and holds with being coupled to.Setting R (1)=[(resistance value of first resistance unit 1706)/17] (Ω), R (2)={ [(resistance value of first resistance unit 1706) * 7]/53} (Ω), R (3)=[(resistance value of first resistance unit 1706)/17] (Ω); And in Figure 21, under the situation of the resistance value of first resistance unit 2104 of R (1)=R (2)=R (3)=Figure 21, set Vdc (1)=(0.8/9) (V), Vdc (2)=(0.1/3) (V), Vdc (3)=(4.1/9) (V).In like manner, in Figure 14 and Figure 15, if the characteristic of required gain trace is: V1=0.1V, Vx=0.2V, Vy=0.9V, V2=1V, V1 '=0.1V, Vx '=0.2V, Vy '=0.9V, V2 '=1V, Vo1 '=0.1V, Vox '=1V, Voy '=4V, Vo2 '=4.9V, then in Figure 16, set Vr (1)=0.1V, Vr (2)=0.2V, Vr (3)=0.9V, Vr (4)=1V; In Figure 17 and Figure 11, first signal end 1700 connects the output terminal 11364 of voltage output module 1136, and secondary signal end 1702 connects first input end 11360, the three signal ends 1704 of voltage output module 1136 and holds with being coupled to.Set R (1)=[(resistance value of first resistance unit 1706)/17] (Ω), R (2)=[(resistance value of first resistance unit 1706) * 7]/53} (Ω), R (3)=(resistance value of first resistance unit 1706)/17] (Ω); In Figure 21, under the situation of the resistance value of first resistance unit 2104 of R (1)=R (2)=R (3)=Figure 21, set Vdc (1) b=(4.1/9) (V), Vdc (2) b=(0.1/3) (V), Vdc (3) b=(0.8/9) (V); And in Figure 11, set R1/R2=1, Vdc=1.1V.Figure 14 and Figure 15 and Figure 12 and Figure 13 difference are that corresponding voltage value V2 ', Vy ', Vx ', V1 ' that Figure 12 earlier changes Figure 12 input voltage V1, Vx, Vy, V2 into Figure 14 through Figure 11 Semi-polarity counter-rotating module 11380 are afterwards, determine the output voltage gain of voltage output modules 1136 again by the gain decision module 1132 of voltage conversion device 1100, and voltage is selected the translational movement of module 1134 decision output voltage V o.
Please refer to Figure 25, Figure 25 is the synoptic diagram of one embodiment of the invention voltage conversion device 250.The aanalogvoltage Vi that voltage conversion device 250 is exported in order to change an analog voltage source, this analog voltage source can be the video data in the flat-panel screens.Voltage conversion device 250 is similar to the framework of voltage conversion device 30, so same components is adopted same numeral.In voltage conversion device 30, one end of gain selector switch 322 is held with being coupled to, and in voltage conversion device 250, one end of gain selector switch 25322 then changes into and is coupled to DC voltage Vdc (1)～Vdc (n) (with Fig. 5 is example, resistance R 50_1 changes into and is coupled to DC voltage Vdc (1), resistance R 50_ (n-1) changes into and is coupled to DC voltage Vdc (n-1), and resistance R 50_ (n) changes into and is coupled to DC voltage Vdc (n)).Please refer to Figure 26, Figure 26 is the synoptic diagram of gain selector switch 25322.Gain selector switch 25322 includes one first signal end 2600, a secondary signal end 2602, one first resistance unit 2606 and a resistance value decision module 2608.First input end 360, the first signal ends 2600 that secondary signal end 2602 is coupled to voltage output module 36 are coupled to the output terminal 364 of voltage output module 36.Resistance value decision module 508 is similar among the function of resistance value decision module 2608 and Fig. 5, in order to the digital signal D (n) that is exported according to analog-to-digital converter 320, a direct current voltage that determines DC voltage Vdc (1)～Vdc (n) by switch element SW260_1～SW260_n to secondary signal end 2602 with and the resistance of corresponding resistance R 260_1～R260_n.Certainly, also can replace resistance value decision module 2608 to save circuit cost with a resistance value decision module 2708 in addition as shown in figure 27.
The function mode of voltage conversion device 250 is similar to voltage conversion device 30, all be with negative feedback mode, according to the gain gain that selector switch determined, amplify input voltage Vi, its difference is: in voltage conversion device 30, one end of gain selector switch 322 is held with being coupled to, and in voltage conversion device 250,25322 of selector switchs of gain change into and are coupled to DC voltage Vdc (1)～Vdc (n).In addition, in voltage conversion device 30, voltage selects the output terminal of module 34 to be coupled to second input end 362 of voltage output module 36, and in voltage conversion device 250, then change second input end 362 that is coupled to voltage output module 36 by input voltage Vi, do not need voltage to select module 34.Therefore, those of ordinary skills can determine the characteristic of each assembly, to determine required voltage gain, to obtain gain change graph shown in Figure 10 according to required voltage turnover equally.
In addition, at LCD, also need consider the problem that the polarity of output voltage need be reversed.Therefore, according to voltage conversion device 250, the present invention provides a voltage conversion device that is used for the video data of LCD in addition.
Please refer to Figure 28, Figure 28 is the synoptic diagram of one embodiment of the invention voltage conversion device 2800.The aanalogvoltage Vi that voltage conversion device 2800 is exported in order to change an analog voltage source, this analog voltage source can be the video data of a LCD.Voltage conversion device 2800 is similar to the framework of voltage conversion device 1100, so same components is adopted same numeral.In voltage conversion device 1100, one end of gain selector switch 11322 is held with being coupled to, and in voltage conversion device 2800,28322 of selector switchs of gain change into and are coupled to polarity selection signal POL and DC voltage Vdc (1)～Vdc (n), (with Figure 17 is example to Vdc (1) b～Vdc (n) b, resistance R (1) changes into and is coupled to switch and DC voltage Vdc (1) b and switch and DC voltage Vdc (1), resistance R (2) changes into and is coupled to switch and DC voltage Vdc (2) b and switch and DC voltage Vdc (2), resistance R (3) changes into and is coupled to switch and DC voltage Vdc (3) b and switch and DC voltage Vdc (3), and resistance R (4) changes into and is coupled to switch and DC voltage Vdc (4) b and switch and DC voltage Vdc (4).Please refer to Figure 29, Figure 29 is the synoptic diagram of gain selector switch 28322.Gain selector switch 28322 includes one first signal end 2900, a secondary signal end 2902, one first resistance unit 2906 and a resistance value decision module 2908.First input end 11360, the first signal ends 2900 that secondary signal end 2902 is coupled to voltage output module 1136 are coupled to the output terminal 11364 of voltage output module 1136.Resistance value decision module 2106 is similar among the function of resistance value decision module 2908 and Figure 21, does not give unnecessary details at this.Certainly, also can replace resistance value decision module 2908 to save circuit cost with a resistance value decision module 3008 in addition as shown in figure 30.
The function mode of voltage conversion device 2800 is similar to voltage conversion device 1100, all be according to polarity selection signal POL (and reverse signal POLB of polarity selection signal POL), after aanalogvoltage Vi is converted to suitable polarity, according to the gain gain that selector switch determined, amplify input voltage Vi, its difference is: in voltage conversion device 1100, one end of gain selector switch 11322 is held with being coupled to, and in voltage conversion device 2800,28322 of selector switchs of gain change into and are coupled to polarity selection signal POL and DC voltage Vdc (1)～Vdc (n), Vdc (1) b～Vdc (n) b.In addition, in voltage conversion device 1100, voltage selects the output terminal of module 1134 to be coupled to second input end 11362 of voltage output module 1136, and in voltage conversion device 2800, then change second input end 11362 that is coupled to voltage output module 1136 by the output terminal of voltage receiver module 1138, do not need voltage to select module 1134.Therefore, those of ordinary skills can determine the characteristic of each assembly, to determine required voltage gain, to obtain Figure 13 and gain change graph shown in Figure 15 according to required voltage turnover equally.For instance, in Figure 12 and Figure 13, if the characteristic of required gain trace is: V1=0.1V, Vx=0.2V, Vy=0.9V, V2=1V, Vo1=0.1V, Vox=1V, Voy=4V, Vo2=4.9V, then in Figure 16, set Vr (1)=0.1V, Vr (2)=0.2V, Vr (3)=0.9V, Vr (4)=1V; In Figure 29 and Figure 28, first signal end 2900 connects the output terminal 11364 of voltage output module 1136, and secondary signal end 2902 connects the first input end 11360 of voltage output module 1136.Setting R (1)=[(resistance value of first resistance unit 2906)/8] (Ω), R (2)={ [(resistance value of first resistance unit 2906) * 7]/23} (Ω), R (3)=[(resistance value of first resistance unit 2906)/8] (Ω); And set Vdc (1)=(0.8/8) (V), Vdc (2)=(0.1/2.3) (V), Vdc (3)=(4.1/8) are (V).In like manner, in Figure 14 and Figure 15, if the characteristic of required gain trace is: V1=0.1V, Vx=0.2V, Vy=0.9V, V2=1V, V1 '=0.1V, Vx '=0.2V, Vy '=0.9V, V2 '=1V, Vo1 '=0.1V, Vox '=1V, Voy '=4V, Vo2 '=4.9V, then in Figure 16, set Vr (1)=0.1V, Vr (2)=0.2V, Vr (3)=0.9V, Vr (4)=1V; In Figure 29 and Figure 28, first signal end 2900 connects the output terminal 11364 of voltage output module 1136, and secondary signal end 2902 connects the first input end 11360 of voltage output module 1136.Setting R (1)=[(resistance value of first resistance unit 2906)/8] (Ω), R (2)={ [(resistance value of first resistance unit 2906) * 7]/23} (Ω), R (3)=[(resistance value of first resistance unit 2906)/8] (Ω); Set simultaneously Vdc (1) b=(4.1/8) (V), (0.1/2.3) (V), Vdc (3) b=(0.8/8) are (V) for Vdc (2) b=; And in Figure 28, set R1/R2=1, Vdc=1.1V.Same, Figure 14 and Figure 15 and Figure 12 and Figure 13 difference are corresponding voltage value V2 ', Vy ', Vx ', V1 ' that Figure 12 earlier changes Figure 12 input voltage V1, Vx, Vy, V2 into Figure 14 through Figure 28 Semi-polarity counter-rotating module 11380 afterwards, again by the output voltage gain of the gain decision module 1132 decision voltage output modules 1136 of voltage conversion device 2800 and the translational movement of output voltage V o.
In sum, the present invention can adjust output gain by the components values in the control voltage conversion device, makes the present invention under different input voltages, and different gains is arranged.Further, the present invention can pass through polarity selection signal in addition, the mutual output voltage of output positive-negative polarity.Therefore, when voltage conversion device of the present invention system when changing the video data of a LCD, the gray-level characteristic that LCD presented can be similar to the identification capability of human eye to brightness, and liquid crystal molecule system drives with positive-negative polarity voltage alternant way, make that the image that the user experienced is natural, and can avoid ghost phenomena and liquid crystal molecule to damage.
The above only is preferred embodiment of the present invention, and all equalizations of carrying out according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (42)
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| CN105788538B (en) * | 2016-05-16 | 2018-03-09 | 京东方科技集团股份有限公司 | Show driving voltage gating circuit |
| CN108206015B (en) * | 2018-01-02 | 2020-12-25 | 京东方科技集团股份有限公司 | Analog power supply driving method, analog power supply driving device and display device |
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| US5043672A (en) * | 1990-03-26 | 1991-08-27 | Novatel Communications Ltd. | Power detector utilizing bias voltage divider for precision control of an amplifier |
| US5534864A (en) * | 1992-02-03 | 1996-07-09 | Hitachi, Ltd. | Pipelined analog-to-digital converter |
| JP2001285068A (en) * | 2000-03-31 | 2001-10-12 | Yamaha Corp | Digital/analog converter |
| CN1411141A (en) * | 2001-09-27 | 2003-04-16 | 义隆电子股份有限公司 | Analog-to-Digital Converter |
| WO2006064618A1 (en) * | 2004-12-17 | 2006-06-22 | Matsushita Electric Industrial Co., Ltd. | Gain-variable analog/digital converter, method for adjusting gain of gain-variable analog/digital converter, and system including gain-variable analog/digital converter |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5043672A (en) * | 1990-03-26 | 1991-08-27 | Novatel Communications Ltd. | Power detector utilizing bias voltage divider for precision control of an amplifier |
| US5534864A (en) * | 1992-02-03 | 1996-07-09 | Hitachi, Ltd. | Pipelined analog-to-digital converter |
| JP2001285068A (en) * | 2000-03-31 | 2001-10-12 | Yamaha Corp | Digital/analog converter |
| CN1411141A (en) * | 2001-09-27 | 2003-04-16 | 义隆电子股份有限公司 | Analog-to-Digital Converter |
| WO2006064618A1 (en) * | 2004-12-17 | 2006-06-22 | Matsushita Electric Industrial Co., Ltd. | Gain-variable analog/digital converter, method for adjusting gain of gain-variable analog/digital converter, and system including gain-variable analog/digital converter |
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