CN203590204U - Digital analog conversion circuit and display device - Google Patents
Digital analog conversion circuit and display device Download PDFInfo
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- CN203590204U CN203590204U CN201320440697.5U CN201320440697U CN203590204U CN 203590204 U CN203590204 U CN 203590204U CN 201320440697 U CN201320440697 U CN 201320440697U CN 203590204 U CN203590204 U CN 203590204U
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Abstract
The utility model discloses a digital analog conversion circuit and a display device, so element number is reduced, thereby saving space; the circuit comprises a voltage in proportion zoom circuit and an electric charge in proportion zoom circuit; the voltage in proportion zoom circuit is used for carrying out first voltage division to the voltage inputted from an input end, so multi-path voltage is generated and outputted to the electric charge in proportion zoom circuit; the electric charge in proportion zoom circuit is used for carrying out second voltage division for each path voltage inputted to the electric charge in proportion zoom circuit, so multi-path voltage is generated and outputted from an output end of the electric charge in proportion zoom circuit. Or the electric charge in proportion zoom circuit is used for carrying out first voltage division for the voltage inputted from an input end, so multi-path voltage is generated and outputted to the voltage in proportion zoom circuit; the voltage in proportion zoom circuit is used for carrying out second voltage division to each path voltage inputted in the voltage in proportion zoom circuit, so multi-path voltage is generated and outputted from an output end of the voltage in proportion zoom circuit.
Description
Technical field
The utility model relates to display device technology field, relates in particular to a kind of D/A converting circuit and display unit.
Background technology
Along with low temperature polycrystalline silicon (Low Temperature Poly-Silicon, LTPS) thin-film transistor (Thin Film Transistor, TFT) the continuous progress of technology, promotes liquid crystal indicator (Liquid Crystal Display, LCD) technology to the future development of high definition.LTPS technology is compared with amorphous silicon (a-Si) technology generally adopting at present, there is higher electron mobility and drive current, therefore, adopt LTPS technology not only can produce high definition, high-resolution LCD, also peripheral circuit can be integrated on glass substrate simultaneously.
Original digital-to-analogue conversion in liquid crystal indicator (Digital Analog Converter, DAC) circuit is present in Source drive, and D/A converting circuit has different forms, such as traditional voltage scaling circuit and electric charge bi-directional scaling circuit etc.Wherein, voltage scaling circuit is referring to Fig. 1, with series resistance string to reference voltage V
refcarry out dividing potential drop, as expect the voltage of a certain node, need to realize by gating switch below.Gating switch is arranged in the row at D0, D1, D2, D3, D4 and D5 place, all there is a gating switch at each resistance two ends, wherein the quantity of the quantity of gating switch resistance in voltage scaling circuit determines, 6 bits (bit) voltage scaling circuit needs 64 resistance, and the resistance that 8bit and more high-resolution voltage scaling circuit need is more.In the row that D0-D5 controls, arbitrary moment only has half switch closed, can guarantee like this output V of voltage scaling circuit
outcan the unique voltage of output.Electric charge bi-directional scaling circuit is referring to Fig. 2, with shunt capacitance to reference voltage V
refcarry out dividing potential drop, wherein the electric capacity in each road of parallel circuits is all connected with a switch, 6bit electric charge bi-directional scaling circuit needs 7 electric capacity in parallel, shunt capacitance is respectively C, C, 2C, 4C, 8C, 16C and 32C, wherein, C representation unit electric capacity, maximum electric capacity is specific capacitance 32 times.As expected, the voltage of a certain node need the switch by being connected with electric capacity to realize.Switch b0, b1, b2, b3, arbitrary moment of b4, b5 only have a closure, and the equal ground connection of remaining switch can guarantee the output V of electric charge bi-directional scaling circuit like this
outcan the unique voltage of output.The electric capacity that 8bit and more high-resolution electric charge bi-directional scaling circuit need is more, and the capacitance of electric capacity is also larger accordingly.
In sum, the voltage scaling circuit structure rule in prior art in D/A converting circuit, monotonicity is good, but when doing high-resolution, can be subject to the limitation of resistance quantity; Electric charge bi-directional scaling circuit speed in D/A converting circuit is fast, and precision is high, more easily mates, but than transistor when high-resolution, has the more and capacitor's capacity scope problems of too of electric capacity quantity.
Utility model content
The utility model embodiment provides a kind of D/A converting circuit and display unit, in order to realize the combination of voltage scaling circuit and electric charge bi-directional scaling circuit, realizes and reduces number of elements in traditional D/A converting circuit, joint space-efficient object.
A kind of D/A converting circuit that the utility model embodiment provides, this circuit comprises: voltage scaling circuit and electric charge bi-directional scaling circuit, wherein, voltage scaling circuit is for carrying out dividing potential drop for the first time to the voltage of voltage scaling circuit input end input, generate plurality of voltages and export to electric charge bi-directional scaling circuit, electric charge bi-directional scaling circuit, for carrying out second divided voltage to being input to each road voltage of electric charge bi-directional scaling circuit, generates plurality of voltages and exports by the output of electric charge bi-directional scaling circuit; Or,
Electric charge bi-directional scaling circuit is for carrying out dividing potential drop for the first time to the voltage of electric charge bi-directional scaling circuit input end input, generate plurality of voltages and export to voltage scaling circuit, voltage scaling circuit, for carrying out second divided voltage to being input to each road voltage of voltage scaling circuit, generates plurality of voltages and exports by the output of voltage scaling circuit.
A kind of display unit that the utility model embodiment provides, comprises described D/A converting circuit.
In sum, the D/A converting circuit of the utility model embodiment and display unit, wherein D/A converting circuit comprises: voltage scaling circuit and electric charge bi-directional scaling circuit, voltage scaling circuit is for carrying out dividing potential drop for the first time to the voltage of voltage scaling circuit input end input, generate plurality of voltages and export to electric charge bi-directional scaling circuit, electric charge bi-directional scaling circuit is for carrying out second divided voltage to being input to each road voltage of electric charge bi-directional scaling circuit, generate plurality of voltages and export by the output of electric charge bi-directional scaling circuit, or, electric charge bi-directional scaling circuit is for carrying out dividing potential drop for the first time to the voltage of electric charge bi-directional scaling circuit input end input, generate plurality of voltages and export to voltage scaling circuit, voltage scaling circuit is for carrying out second divided voltage to being input to each road voltage of voltage scaling circuit, generate plurality of voltages and export by the output of voltage scaling circuit, the utility model is in conjunction with the advantage of voltage scaling circuit and electric charge bi-directional scaling circuit, formed a kind of new D/A converting circuit, this circuit has reduced the number of elements in traditional D/A converting circuit, and saved space.
Accompanying drawing explanation
Fig. 1 is the voltage scaling circuit diagram of 6bit D/A converting circuit in prior art;
Fig. 2 is the electric charge bi-directional scaling circuit diagram of 6bit D/A converting circuit in prior art;
A kind of 6bit D/A converting circuit schematic diagram that Fig. 3 provides for the utility model embodiment;
The another kind of 6bit D/A converting circuit schematic diagram that Fig. 4 provides for the utility model embodiment.
Embodiment
The utility model embodiment provides a kind of D/A converting circuit and display unit, in order to realize the combination of voltage scaling circuit and electric charge bi-directional scaling circuit, realizes and reduces number of elements in traditional D/A converting circuit, joint space-efficient object.
Provide the detailed introduction of the technical scheme that the utility model embodiment provides below.
A kind of D/A converting circuit that the utility model embodiment provides, this circuit comprises: voltage scaling circuit and electric charge bi-directional scaling circuit, wherein, voltage scaling circuit is for carrying out dividing potential drop for the first time to the voltage of voltage scaling circuit input end input, generate plurality of voltages and export to electric charge bi-directional scaling circuit, electric charge bi-directional scaling circuit, for carrying out second divided voltage to being input to each road voltage of electric charge bi-directional scaling circuit, generates plurality of voltages and exports by the output of electric charge bi-directional scaling circuit; Or,
Electric charge bi-directional scaling circuit is for carrying out dividing potential drop for the first time to the voltage of electric charge bi-directional scaling circuit input end input, generate plurality of voltages and export to voltage scaling circuit, voltage scaling circuit, for carrying out second divided voltage to being input to each road voltage of voltage scaling circuit, generates plurality of voltages and exports by the output of voltage scaling circuit.
Preferably, described voltage scaling circuit comprises input, the first output and the second output, described voltage scaling circuit receives reference voltage by input, and reference voltage is generated to plurality of voltages, each road voltage is exported to electric charge bi-directional scaling circuit by the first output and the second output respectively again;
Described electric charge bi-directional scaling circuit comprises first input end, the second input and output, the first input end of described electric charge bi-directional scaling circuit is connected with the first output of described voltage scaling circuit, the second input of described electric charge bi-directional scaling circuit is connected with the second output of described voltage scaling circuit, described electric charge bi-directional scaling circuit is used for each road voltage of described voltage scaling circuit to generate plurality of voltages, and exports by output.
Preferably, described D/A converting circuit also comprises comparison circuit, the first output of described voltage scaling circuit is connected with the first input end of described electric charge bi-directional scaling circuit by comparison circuit, and the second output of described voltage scaling circuit is connected with the second input of described electric charge bi-directional scaling circuit by comparison circuit.
Preferably, described electric charge bi-directional scaling circuit comprises input, the first output and the second output, described electric charge bi-directional scaling circuit receives reference voltage by input, and reference voltage is generated to plurality of voltages, each road voltage is exported to voltage scaling circuit by the first output and the second output respectively again;
Described voltage scaling circuit comprises first input end, the second input and output, the first input end of described voltage scaling circuit is connected with the first output of described electric charge bi-directional scaling circuit, the second input of described voltage scaling circuit is connected with the second output of described electric charge bi-directional scaling circuit, described voltage scaling circuit is used for each road voltage of described electric charge bi-directional scaling circuit to generate plurality of voltages, and exports by output.
Preferably, described D/A converting circuit also comprises comparison circuit, the first output of described electric charge bi-directional scaling circuit is connected with the first input end of described voltage scaling circuit by comparison circuit, and the second output of described electric charge bi-directional scaling circuit is connected with the second input of described voltage scaling circuit by comparison circuit.
Preferably, described voltage scaling circuit comprises a plurality of resistance, wherein a plurality of resistance is all connected in series between described voltage scaling circuit input end and earth point, and each resistance signal input is connected with one end of a switch respectively, described in each, the other end of switch is connected with the output of voltage scaling circuit.
Preferably, described electric charge bi-directional scaling circuit comprises a plurality of electric capacity, wherein a plurality of electric capacity is all connected in parallel, one end of a plurality of electric capacity that are connected in parallel is all connected with output or first output of electric charge bi-directional scaling circuit, and one end of a plurality of electric capacity that are connected in parallel is all connected with earth point by a reset switch, the other end of one of them electric capacity is connected with the second input or second output of electric charge bi-directional scaling circuit, and the other end of all the other electric capacity is connected with the input of electric charge bi-directional scaling circuit by a switch respectively.
Preferably, described D/A converting circuit is 6 bit bit D/A converting circuits, D/A converting circuit in the utility model specific embodiment is not limited to 6bit D/A converting circuit, and 8bit and more high-resolution D/A converting circuit all can be constructed similar D/A converting circuit structure.
Preferably, described voltage scaling circuit comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance and eight divider resistances of the 8th resistance and a protective resistance, these nine resistance are connected in series successively, wherein one end of the first resistance is connected with voltage scaling circuit input end, the other end is connected with the second resistance, by that analogy, one end of protective resistance is connected with the 8th resistance, other end ground connection, the two ends of eight divider resistances are connected with one end of a switch respectively, the switch other end is connected with output.
Preferably, described electric charge bi-directional scaling circuit comprises the first electric capacity, the second electric capacity, the 3rd electric capacity and 4 electric capacity of the 4th electric capacity, 4 Capacitance parallel connections connect, one end of 4 electric capacity that are connected in parallel is all connected with output or first output of electric charge bi-directional scaling circuit, and one end of a plurality of electric capacity that are connected in parallel is all connected with earth point by a reset switch, the other end of the first electric capacity is connected with the second input or second output of electric charge bi-directional scaling electricity, the second electric capacity, the 3rd electric capacity is connected with the input of electric charge bi-directional scaling circuit by a switch respectively with the other end of the 4th electric capacity.
Below in conjunction with specific embodiment, describe.
Embodiment mono-:
As shown in Figure 3, D/A converting circuit in the utility model specific embodiment is 6bit D/A converting circuit, this circuit comprises: voltage scaling circuit 1 and electric charge bi-directional scaling circuit 2, voltage scaling circuit 1 comprises input 31, the first output 32 and the second output 33, and electric charge bi-directional scaling circuit 2 comprises first input end 34, the second input 35 and output 36, the first output 32 of voltage scaling circuit 1 is connected with the first input end 34 of electric charge bi-directional scaling circuit 2 by comparison circuit, the second output 33 of voltage scaling circuit 1 is connected with the second input 35 of electric charge bi-directional scaling circuit 2 by comparison circuit, wherein the basic principle of comparison circuit is that an analog voltage signal is compared with a reference voltage, the two-way of comparison circuit is input as analog signal, when the difference of input voltage increases or reduces, comparison circuit can keep its output constant, comparison circuit can play the effect of burning voltage output.Voltage scaling circuit 1 is as highest significant position (the most significant bit of 6bit D/A converting circuit, MSB) part, the bit number of this part is 3bit, electric charge bi-directional scaling circuit 2 least significant bits as 6bit D/A converting circuit (least significant bit, LSB) part, the bit number of this part is also 3bit, and this two parts cascade can realize the D/A converting circuit function of 6bit.
In Fig. 3, voltage scaling circuit 1 comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7 and 8 eight divider resistances of the 8th resistance R and a protective resistance R9, these nine resistance are connected in series successively, wherein one end of the first resistance R 1 is connected with the input 31 of voltage scaling circuit 1, the other end is connected with the second resistance R 2, by that analogy, one end of protective resistance R9 is connected with the 8th resistance R 8, other end ground connection, the two ends of eight divider resistances are connected with one end of a switch respectively, the switch other end is connected with the second output 33 with the first output 32, wherein, eight divider resistances are identical with the model of a protective resistance.Electric charge bi-directional scaling circuit 2 comprises the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3 and 4 four electric capacity of the 4th capacitor C, and wherein the first capacitor C 1 is identical with the second capacitor C 2, and C1 and C2 are specific capacitance C, and the 3rd capacitor C 3 is 2C, and the 4th capacitor C 4 is 4C.Four Capacitance parallel connections connect, one end of four electric capacity that are connected in parallel is all connected with the output 36 of electric charge bi-directional scaling circuit, and one end of four electric capacity that are connected in parallel is all connected with earth point by a reset switch, the other end of the first capacitor C 1 is connected with the second input 35 of electric charge bi-directional scaling circuit, and the other end of the second capacitor C 2 is by switch b
0, the 3rd capacitor C 3 the other end by switch b
1, the 4th capacitor C 4 the other end by switch b
2be connected with first input end 34 or second input 35 of electric charge bi-directional scaling circuit.
The D/A converting circuit of 6bit needs 64 road voltages, and the way of the utility model embodiment is that needs 64 road voltage is decomposed into 8 * 2
3, wherein 8 represent that voltage scaling circuit produces 8 road voltages, each Lu Zaijing electric charge bi-directional scaling circuit produces 2
3road voltage, the electric capacity quantity now needing is 3+1=4 electric capacity, number of elements is 8+4=12 like this.Particularly, first eight divider resistances in the 3bit voltage scaling circuit of the MSB part of 6bit D/A converting circuit by voltage V
ingenerate 8 road voltages, by switch, can select arbitrary magnitude of voltage, and this magnitude of voltage is input in the electric charge bi-directional scaling circuit of next stage, the formula that electric charge bi-directional scaling circuit produces voltage is:
c in formula represents the capacitance of the specific capacitance in electric charge bi-directional scaling circuit, b
irepresent i switch in electric charge bi-directional scaling circuit, its value is to represent that switch is closed at 1 o'clock, and its value is to represent that switch disconnects at 0 o'clock, V
reffor the voltage of electric charge bi-directional scaling circuit input, V
outvoltage for the output of electric charge bi-directional scaling circuit.64 road voltages are according to 8 * 2
3during decomposition, the B=3 in formula, can find out from formula, and electric charge bi-directional scaling circuit can produce 8 road voltages, so two-stage can produce 8 * 8=64 step voltage altogether, thereby realizes the function of 6bit D/A converting circuit.If adopt 16 * 2
2, the resistance quantity that needs of the combinations such as 32 * 2 can increase, and if adopt 4 * 2
4, 2 * 2
5deng combination, the resistance quantity needing reduces, but the electric capacity needing can increase to 5C or 6C, and electric capacity too conference increases technology difficulty, and therefore, for the D/A converting circuit of 6bit, compound mode is 8 * 2 best
3.As realized the D/A converting circuit of 8bit, Ze Xu 256 road voltages, compound mode is 16 * 2 best
4, wherein 16 represent that voltage scaling circuit produces 16 road voltages, each Lu Zaijing electric charge bi-directional scaling circuit produces 2
4road voltage, the electric capacity number now needing is 4+1=5 electric capacity, capacitance maximum is 5C.For more high-resolution D/A converting circuit, all can construct similar circuit structure, and adopt similar mode to carry out best combination, to determine best resistance and electric capacity quantity.
In the utility model embodiment, electric capacity and resistance quantity definite takes into account the consideration of number of elements and process complexity and optimal capacitance and the resistance quantity selected, in the utility model embodiment, in D/A converting circuit, electric capacity and resistance quantity are not limited to above mentioned combination, and other similar combination is also passable.
Embodiment bis-:
As shown in Figure 4, D/A converting circuit in another specific embodiment of the utility model is 6bit D/A converting circuit, this circuit comprises: electric charge bi-directional scaling circuit 10 and voltage scaling circuit 20, electric charge bi-directional scaling circuit 10 comprises input 41, the first output 42 and the second output 43, and voltage scaling circuit 20 comprises first input end 44, the second input 45 and output 46; The first output 42 of electric charge bi-directional scaling circuit 10 is connected with the first input end 44 of voltage scaling circuit 20 by comparison circuit, and the second output 43 of electric charge bi-directional scaling circuit 10 is connected with the second input 45 of voltage scaling circuit 20 by comparison circuit.Electric charge bi-directional scaling circuit 10 highest significant positions as 6bit D/A converting circuit (most significant bit, MSB) part, the bit number of this part is 3bit, voltage scaling circuit 20 is as least significant bit (the least significant bit of 6bit D/A converting circuit, LSB) part, the bit number of this part is also 3bit, and this two parts cascade can realize the D/A converting circuit function of 6bit.
In Fig. 4, electric charge bi-directional scaling circuit 10 comprises the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3 and 4 four electric capacity of the 4th capacitor C, wherein the first capacitor C 1 is identical with the second capacitor C 2, C1 and C2 are specific capacitance C, and the 3rd capacitor C 3 is 2C, and the 4th capacitor C 4 is 4C.Four Capacitance parallel connections connect, one end of four electric capacity that are connected in parallel is all connected with the first output 42 of electric charge bi-directional scaling circuit 10, and one end of four electric capacity that are connected in parallel is all connected with earth point by a reset switch, the other end of the first capacitor C 1 is connected with the second output 43 of electric charge bi-directional scaling circuit, and the other end of the second capacitor C 2 is by switch b
0, the 3rd capacitor C 3 the other end by switch b
1, the 4th capacitor C 4 the other end by switch b
2be connected with the input 41 of electric charge bi-directional scaling circuit 10, voltage scaling circuit 20 comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7 and 8 eight divider resistances of the 8th resistance R and a protective resistance R9, these nine resistance are connected in series successively, wherein one end of the first resistance R 1 is connected with the first input end 44 of voltage scaling circuit 20, the other end is connected with the second resistance R 2, by that analogy, one end of protective resistance R9 is connected with the 8th resistance R 8, other end ground connection, the two ends of eight divider resistances are connected with one end of a switch respectively, the switch other end is connected with output 46, wherein, eight divider resistances are identical with the model of a protective resistance.
Determining of the concrete number of elements of the D/A converting circuit of the 6bit that the concrete parts number method for determination of amount that the D/A converting circuit of the 6bit that the utility model embodiment bis-provides needs provides with the utility model embodiment mono-, does not repeat them here.
Divider resistance in voltage scaling circuit in the utility model embodiment in the D/A converting circuit of 6bit is 8 resistance, and divider resistance in voltage scaling circuit in 6bit D/A converting circuit of the prior art is 64 resistance; Electric capacity in electric charge bi-directional scaling circuit in the utility model embodiment in the D/A converting circuit of 6bit is that 4 electric capacity and maximum electric capacity are 4C, and electric capacity in electric charge bi-directional scaling circuit in 6bit D/A converting circuit of the prior art is that 7 electric capacity and maximum electric capacity are 32C.Because the resistance quantity of the D/A converting circuit of 6bit in the utility model embodiment and electric capacity quantity and capacitor's capacity have very large minimizing, can save more area, therefore D/A converting circuit can be integrated on glass substrate.Wherein, the prerequisite that is integrated in glass substrate is that requirement glass substrate has higher electron mobility, and meanwhile, LTPS technology has higher electron mobility and drive current, so the glass substrate that the utility model adopts is LTPS glass substrate.D/A converting circuit in the utility model embodiment equally also can be accomplished on Source drive.
A kind of display unit that the utility model embodiment provides, comprises described D/A converting circuit.
Preferably, described display unit is liquid crystal indicator, can be also the display unit of other type.
In sum, the D/A converting circuit of the utility model embodiment and display unit, wherein D/A converting circuit comprises: voltage scaling circuit and electric charge bi-directional scaling circuit, voltage scaling circuit is for carrying out dividing potential drop for the first time to the voltage of voltage scaling circuit input end input, generate plurality of voltages and export to electric charge bi-directional scaling circuit, electric charge bi-directional scaling circuit is for carrying out second divided voltage to being input to each road voltage of electric charge bi-directional scaling circuit, generate plurality of voltages and export by the output of electric charge bi-directional scaling circuit, or, electric charge bi-directional scaling circuit is for carrying out dividing potential drop for the first time to the voltage of electric charge bi-directional scaling circuit input end input, generate plurality of voltages and export to voltage scaling circuit, voltage scaling circuit is for carrying out second divided voltage to being input to each road voltage of voltage scaling circuit, generate plurality of voltages and export by the output of voltage scaling circuit, the utility model is in conjunction with the advantage of voltage scaling circuit and electric charge bi-directional scaling circuit, formed a kind of new D/A converting circuit, this circuit has reduced the number of elements in traditional D/A converting circuit, and saved space.
Obviously, those skilled in the art can carry out various changes and modification and not depart from spirit and scope of the present utility model the utility model.Like this, if within of the present utility model these are revised and modification belongs to the scope of the utility model claim and equivalent technologies thereof, the utility model is also intended to comprise these changes and modification interior.
Claims (11)
1. a D/A converting circuit, is characterized in that, this circuit comprises: voltage scaling circuit and electric charge bi-directional scaling circuit,
Voltage scaling circuit is for carrying out dividing potential drop for the first time to the voltage of voltage scaling circuit input end input, generate plurality of voltages and export to electric charge bi-directional scaling circuit, electric charge bi-directional scaling circuit, for carrying out second divided voltage to being input to each road voltage of electric charge bi-directional scaling circuit, generates plurality of voltages and exports by the output of electric charge bi-directional scaling circuit; Or,
Electric charge bi-directional scaling circuit is for carrying out dividing potential drop for the first time to the voltage of electric charge bi-directional scaling circuit input end input, generate plurality of voltages and export to voltage scaling circuit, voltage scaling circuit, for carrying out second divided voltage to being input to each road voltage of voltage scaling circuit, generates plurality of voltages and exports by the output of voltage scaling circuit.
2. D/A converting circuit according to claim 1, is characterized in that,
Described voltage scaling circuit comprises input, the first output and the second output, described voltage scaling circuit receives reference voltage by input, and reference voltage is generated to plurality of voltages, each road voltage is exported to electric charge bi-directional scaling circuit by the first output and the second output respectively again;
Described electric charge bi-directional scaling circuit comprises first input end, the second input and output, the first input end of described electric charge bi-directional scaling circuit is connected with the first output of described voltage scaling circuit, the second input of described electric charge bi-directional scaling circuit is connected with the second output of described voltage scaling circuit, described electric charge bi-directional scaling circuit is used for each road voltage of described voltage scaling circuit to generate plurality of voltages, and exports by output.
3. D/A converting circuit according to claim 2, it is characterized in that, also comprise comparison circuit, the first output of described voltage scaling circuit is connected with the first input end of described electric charge bi-directional scaling circuit by comparison circuit, and the second output of described voltage scaling circuit is connected with the second input of described electric charge bi-directional scaling circuit by comparison circuit.
4. D/A converting circuit according to claim 1, is characterized in that,
Described electric charge bi-directional scaling circuit comprises input, the first output and the second output, described electric charge bi-directional scaling circuit receives reference voltage by input, and reference voltage is generated to plurality of voltages, each road voltage is exported to voltage scaling circuit by the first output and the second output respectively again;
Described voltage scaling circuit comprises first input end, the second input and output, the first input end of described voltage scaling circuit is connected with the first output of described electric charge bi-directional scaling circuit, the second input of described voltage scaling circuit is connected with the second output of described electric charge bi-directional scaling circuit, described voltage scaling circuit is used for each road voltage of described electric charge bi-directional scaling circuit to generate plurality of voltages, and exports by output.
5. D/A converting circuit according to claim 4, it is characterized in that, also comprise comparison circuit, the first output of described electric charge bi-directional scaling circuit is connected with the first input end of described voltage scaling circuit by comparison circuit, and the second output of described electric charge bi-directional scaling circuit is connected with the second input of described voltage scaling circuit by comparison circuit.
6. according to the D/A converting circuit described in claim 2,3,4 or 5, it is characterized in that, described voltage scaling circuit comprises a plurality of resistance, wherein a plurality of resistance is all connected in series between described voltage scaling circuit input end and earth point, and each resistance signal input is connected with one end of a switch respectively, described in each, the other end of switch is connected with the output of voltage scaling circuit.
7. according to claim 2, 3, D/A converting circuit described in 4 or 5, it is characterized in that, described electric charge bi-directional scaling circuit comprises a plurality of electric capacity, wherein a plurality of electric capacity is all connected in parallel, one end of a plurality of electric capacity that are connected in parallel is all connected with output or first output of electric charge bi-directional scaling circuit, and one end of a plurality of electric capacity that are connected in parallel is all connected with earth point by a reset switch, the other end of one of them electric capacity is connected with the second input or second output of electric charge bi-directional scaling circuit, the other end of all the other electric capacity is connected with the input of electric charge bi-directional scaling circuit by a switch respectively.
8. according to the D/A converting circuit described in claim 2,3,4 or 5, it is characterized in that, described D/A converting circuit is 6 bit number analog conversion circuits.
9. D/A converting circuit according to claim 8, it is characterized in that, described voltage scaling circuit comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance and eight divider resistances of the 8th resistance and a protective resistance, these nine resistance are connected in series successively, wherein one end of the first resistance is connected with voltage scaling circuit input end, the other end is connected with the second resistance, by that analogy, one end of protective resistance is connected with the 8th resistance, other end ground connection, the two ends of eight divider resistances are connected with one end of a switch respectively, the switch other end is connected with output.
10. D/A converting circuit according to claim 8, it is characterized in that, described electric charge bi-directional scaling circuit comprises the first electric capacity, the second electric capacity, the 3rd electric capacity and 4 electric capacity of the 4th electric capacity, 4 Capacitance parallel connections connect, one end of 4 electric capacity that are connected in parallel is all connected with output or first output of electric charge bi-directional scaling circuit, and one end of a plurality of electric capacity that are connected in parallel is all connected with earth point by a reset switch, the other end of the first electric capacity is connected with the second input or second output of electric charge bi-directional scaling circuit, the second electric capacity, the 3rd electric capacity is connected with the input of electric charge bi-directional scaling circuit by a switch respectively with the other end of the 4th electric capacity.
11. 1 kinds of display unit, is characterized in that, described display unit comprises the D/A converting circuit as described in claim as arbitrary in claim 1-10.
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| CN201320440697.5U CN203590204U (en) | 2013-07-23 | 2013-07-23 | Digital analog conversion circuit and display device |
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| CN201320440697.5U CN203590204U (en) | 2013-07-23 | 2013-07-23 | Digital analog conversion circuit and display device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105656490A (en) * | 2016-01-27 | 2016-06-08 | 深圳市华星光电技术有限公司 | Digital-to-analogue conversion module, data driving circuit and liquid crystal display |
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2013
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105656490A (en) * | 2016-01-27 | 2016-06-08 | 深圳市华星光电技术有限公司 | Digital-to-analogue conversion module, data driving circuit and liquid crystal display |
| CN105656490B (en) * | 2016-01-27 | 2018-12-07 | 深圳市华星光电技术有限公司 | A kind of D/A converter module, data drive circuit and liquid crystal display |
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