CN107819444B - Voltage signal amplifying circuit - Google Patents
Voltage signal amplifying circuit Download PDFInfo
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- CN107819444B CN107819444B CN201710985780.3A CN201710985780A CN107819444B CN 107819444 B CN107819444 B CN 107819444B CN 201710985780 A CN201710985780 A CN 201710985780A CN 107819444 B CN107819444 B CN 107819444B
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- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 22
- 239000004973 liquid crystal related substance Substances 0.000 description 16
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/34—Negative-feedback-circuit arrangements with or without positive feedback
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
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Abstract
A voltage signal amplification circuit comprising: a base source voltage input module for inputting a base source voltage; a compensation voltage input module for inputting a compensation voltage; the voltage superposition module is electrically connected with the base source voltage input module and the compensation voltage input module and is used for superposing the base source voltage and the compensation voltage and outputting superposed voltage; the bias amplification module is electrically connected with the voltage superposition module, receives the superposed voltage output by the voltage superposition module and the alternating current voltage signal output by the front DAC module, and performs bias amplification processing on the alternating current voltage signal; the AC voltage signal output by the DAC module is a bias non-zero AC voltage signal, and the compensation voltage input by the compensation voltage input module is used for compensating the DC bias voltage of the AC voltage signal output by the pre-DAC module. The voltage output by the voltage signal amplifying circuit of the invention conforms to the theoretical value.
Description
Technical Field
The invention relates to the technical field of liquid crystal display panels, in particular to a voltage signal amplifying circuit which is used for amplifying an alternating current voltage signal input by a front DAC module so as to drive a liquid crystal panel to work.
Background
In recent years, liquid crystal displays (lcds) have features of light and thin profile, low power consumption, and no radiation pollution, and have been widely used in portable information products such as notebook computers and Personal Digital Assistants (PDAs), wherein the lcds mainly include a liquid crystal panel and a driving device for driving the liquid crystal panel. The driving device comprises a front DAC module (digital-to-analog conversion module), and a voltage signal generated by the front DAC module is conducted to an electrode on the CF side of the liquid crystal panel after being processed, so that the driving device is used for the width function of the liquid crystal panel.
The front DAC module comprises a 6-bit front DAC module, a 7-bit front DAC module, an 8-bit front DAC module, a 12-bit front DAC module and the like. The higher the bit number of the pre-DAC module is, the lower the voltage range output by the pre-DAC module is, namely, the lower the output voltage is, and the lower the bit number is, the larger the voltage range output by the pre-DAC module is, namely, the larger the output voltage is. The front-end DAC modules with different numbers can affect the narrow visual angle effect of the liquid crystal panel, the higher the number of the numbers; the higher the number of bits, the smaller the output voltage range of the front DAC module, the lower the display effect, and the lower the display effect, because the front DAC module does not meet the operating requirement on the electrode on the CF side of the liquid crystal panel.
Disclosure of Invention
The invention aims to provide a voltage signal amplifying circuit which can output a feedback voltage signal with a small theoretical difference, and the circuit is applied to a liquid crystal display to amplify an alternating current voltage signal output by a front DAC module with high-digit low-voltage output so as to apply the front DAC module with high-digit low-voltage output to the liquid crystal display and improve the display effect of the liquid crystal display.
The embodiment of the invention provides a voltage signal amplifying circuit, which comprises:
a base source voltage input module for inputting a base source voltage;
a compensation voltage input module for inputting a compensation voltage;
the voltage superposition module is electrically connected with the base source voltage input module and the compensation voltage input module and is used for superposing the base source voltage and the compensation voltage and outputting superposed voltage; and
the bias amplification module is electrically connected with the voltage superposition module, receives the superposed voltage output by the voltage superposition module and the alternating voltage signal output by the front DAC module, and performs bias amplification processing on the alternating voltage signal;
the AC voltage signal output by the DAC module is a bias non-zero AC voltage signal, and the compensation voltage input by the compensation voltage input module is used for compensating the DC bias voltage of the AC voltage signal output by the pre-DAC module.
Further, the bias amplification module includes an operational amplifier U1 and resistors R1, R2, R3 and R4, one end of the resistor R1 and one end of the resistor R2 are electrically connected to the inverting input terminal of the operational amplifier U1, the other end of the resistor R1 is electrically connected to the pre-DAC module, the other end of the resistor R2 is electrically connected to the output terminal of the operational amplifier U1, one end of the resistor R3 and one end of the resistor R4 are electrically connected to the non-inverting input terminal of the operational amplifier U1, the other end of the resistor R3 is electrically connected to the voltage superposition module, and the other end of the resistor R4 is grounded.
Further, the voltage superposition module includes an operational amplifier U2, resistors R5, R6, R7, R8 and R9, one end of the resistor R5, one end of the resistor R6 and one end of the resistor R7 are all electrically connected to the non-inverting input terminal of the operational amplifier U2, the other end of the resistor R5 is electrically connected to the base source voltage input module, the other end of the resistor R6 is electrically connected to the compensation voltage input module, and the other end of the resistor R7 is grounded; one end of the resistor R8 and one end of the resistor R9 are both electrically connected with the inverting input end of the operational amplifier U2, the other end of the resistor R8 is grounded, the other end of the resistor R9 is electrically connected with the output end of the operational amplifier U2, and the output end of the operational amplifier U2 is electrically connected with the other end of the resistor R3.
Further, the base source voltage input module includes an operational amplifier U3 and a base source voltage source V1, a non-inverting input terminal of the operational amplifier U3 is connected to the base source voltage source V1, an inverting input terminal of the operational amplifier U3 is electrically connected to an output terminal of the operational amplifier U3, and an output terminal of the operational amplifier U3 is electrically connected to the other end of the resistor R5.
Further, the compensation voltage input module includes an operational amplifier U4, a resistor R10, a resistor R11, a voltage source V2, and a voltage source V3, wherein one end of the resistor R10 and one end of the resistor R11 are both electrically connected to the non-inverting input terminal of the operational amplifier U4, one of the other ends of the resistor R10 and the other end of the resistor R11 is electrically connected to the voltage source V3, and the other end of the resistor R10 is electrically connected to the voltage source V2; the inverting input end of the operational amplifier U4 is electrically connected with the output end of the operational amplifier U4, and the output end of the operational amplifier U4 is electrically connected with the other end of the resistor R6; after the voltage source V2 and the voltage source V3 are divided by the resistor R10 and the resistor R11, the voltage provided to the non-inverting input terminal of the operational amplifier U4 is a positive voltage.
Further, the other end of the resistor R11 is electrically connected to the voltage source V2, and the other end of the resistor R10 is electrically connected to the voltage source V3.
Further, the other end of the resistor R11 is electrically connected to the voltage source V3, and the other end of the resistor R10 is electrically connected to the voltage source V2.
Further, the compensation voltage input module is a programmable voltage generator, and is electrically connected to the non-inverting input terminal of the operational amplifier U4 to provide a positive voltage to the non-inverting input terminal of the operational amplifier U4, the inverting input terminal of the operational amplifier U4 is electrically connected to the output terminal of the operational amplifier U4, and the other end of the resistor R6 is electrically connected to the output terminal of the operational amplifier U4.
Further, the value of R2/R1 is 2.
The voltage signal amplifying circuit is used for superposing the output voltages of the base source voltage input module and the compensation voltage input module through the voltage superposition module to be used as the direct-current working voltage DC of the bias amplifying module, the bias amplifying module outputs the voltage signal to be processed input by the pre-DAC module and a feedback voltage signal, and the processed feedback voltage signal is high in precision and accords with a theoretical value with the feedback voltage output theoretically.
Drawings
Fig. 1 is a schematic block diagram of a voltage signal amplifying circuit of the present invention.
Fig. 2 is a circuit diagram of a voltage signal amplifying circuit of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the present invention will be made with reference to the accompanying drawings and examples.
Referring to fig. 1 and fig. 2, an embodiment of a voltage signal amplifying circuit includes a base source voltage input module 1, a compensation voltage input module 2, a voltage superposition module 3, and a bias amplifying module 4. The voltage superposition module 3 is electrically connected with the base source voltage input module 1 and the compensation voltage input module 2, and is used for superposing the base source voltage and the compensation voltage together and outputting a superposed voltage. The offset amplification module 4 is electrically connected with the voltage superposition module 3 and the pre-DAC module 5, and is configured to receive the superposed voltage output by the voltage superposition module 3 and the ac voltage signal output by the pre-DAC module 5, and perform offset amplification processing on the ac voltage signal output by the pre-DAC module 5 to output a feedback voltage signal. In this embodiment, the ac voltage signal output by the pre-DAC module 5 is an offset non-zero ac voltage signal, and the compensation voltage input by the compensation voltage input module 2 is used to compensate the dc offset voltage of the ac voltage signal output by the pre-DAC module 5, so that the amplification accuracy of the voltage signal amplification circuit of the present invention can be improved, and the accuracy of the feedback voltage signal output by the voltage signal amplification circuit of the present invention is high.
The function of the pre-DAC module 5 in the liquid crystal display is to output a voltage signal, i.e., the pre-DAC module 5.
The voltage signal amplifying circuit of the invention superposes the output voltages of the base source voltage input module 1 and the compensation voltage input module 2 through the voltage superposition module 3 to be used as the direct current working voltage DC of the bias amplifying module 4, the bias amplifying module 4 outputs the voltage signal to be processed input by the front DAC module 5 and the feedback voltage signal, and the difference between the processed feedback voltage signal and the feedback voltage signal output theoretically is high in precision.
In this embodiment, the offset amplification module 4 includes an operational amplifier U1 and resistors R1, R2, R3, and R4, one end of the resistor R1 and one end of the resistor R2 are electrically connected to the inverting input terminal of the operational amplifier U1, the other end of the resistor R1 is electrically connected to the pre-DAC module 5, the other end of the resistor R2 is electrically connected to the output terminal of the operational amplifier U1, and the other end of the resistor R2 is electrically connected to the output terminal of the operational amplifier U1. One end of the resistor R3 and one end of the resistor R4 are both electrically connected to the non-inverting input terminal of the operational amplifier U1, the other end of the resistor R3 is electrically connected to the voltage superposition module 3, and the other end of the resistor R4 is grounded.
In this embodiment, the voltage superposition module 3 includes an operational amplifier U2, resistors R5, R6, R7, R8, and R9, wherein one end of the resistor R5, one end of the resistor R6, and one end of the resistor R7 are electrically connected to the non-inverting input terminal of the operational amplifier U2, the other end of the resistor R5 is electrically connected to the base source voltage input module 1, the other end of the resistor R6 is electrically connected to the compensation voltage input module 2, and the other end of the resistor R7 is grounded; one end of the resistor R8 and one end of the resistor R9 are both electrically connected with the inverting input end of the operational amplifier U2, the other end of the resistor R8 is grounded, the other end of the resistor R9 is electrically connected with the output end of the operational amplifier U2, and the output end of the operational amplifier U2 is electrically connected with the other end of the resistor R3. The voltage superposition module 3 with this structure can only superpose the voltage input by the base source voltage input module 1 and the voltage input by the compensation voltage input module 2, and does not amplify the two voltages.
In the present embodiment, the base source voltage input module 1 includes an operational amplifier U3 and a base source voltage source V1, a non-inverting input terminal of the operational amplifier U3 is electrically connected to the base source voltage source V1, an inverting input terminal of the operational amplifier U3 is electrically connected to an output terminal of the operational amplifier U3, and an output terminal of the operational amplifier U3 is electrically connected to the other terminal of the resistor R5. By adopting the structure, the base source voltage input module 1 can ensure that the voltage output by the output end of the operational amplifier U3 is equal to the voltage input by the base source voltage source V1 to the operational amplifier U3, and the output voltage of the operational amplifier U3 does not influence the input voltage of the operational amplifier U3.
In this embodiment, the compensation voltage input module 2 includes an operational amplifier U4, a resistor R10, a resistor R11, a voltage source V2 and a voltage source V3, wherein one end of the resistor R10 and one end of the resistor R11 are both electrically connected to the non-inverting input terminal of the operational amplifier U4, one of the other ends of the resistor R10 and the other end of the resistor R11 is electrically connected to the voltage source V3, the other end of the resistor R10 is electrically connected to the voltage source V2, and after the inverting input terminal of the operational amplifier U4 is electrically connected to the output terminal of the operational amplifier U4, the output terminal of the operational amplifier U4 is electrically connected to the other end of the resistor R6. In the present embodiment, the other end of the resistor R11 is electrically connected to the voltage source V2, and the other end of the resistor R10 is electrically connected to the voltage source V3. In other embodiments, the other end of the resistor R11 is electrically connected to the voltage source V3, and the other end of the resistor R10 is electrically connected to the voltage source V2. The compensation voltage input module 2 with the structure can ensure that the voltage output by the output end of the operational amplifier U4 is equal to the voltage input by the operational amplifier U4, and the output voltage of the operational amplifier U4 does not influence the input voltage of the operational amplifier U4
It should be noted that, in this embodiment, the voltage between the resistors R11 and R10, that is, the voltage value of the positive input terminal of the operational amplifier U4, needs to be a positive voltage (that is, it is necessary to ensure that the voltage value of the positive input terminal of the amplifier U4 is positive dc when selecting V2 and V3 in the above circuit), and its function is to cancel the dc bias of the pre-DAC module 5 itself. Because DAC module 5 in this application and operational amplifier U1's reverse input end electric connection, DAC module 5's direct current bias is the negative value, it is the positive voltage to need to guarantee the voltage value of operational amplifier U4 positive input end, draws back DAC module 5's direct current bias voltage to be 0V. The output voltage of the operational amplifier U4 and the voltage output by the operational amplifier U3 are superimposed by the voltage superimposing module 3 as a dc reference that affects the final amplified signal. In other embodiments, the voltages at the nodes of the resistors R10 and R11 can also be generated by a program voltage generator.
It can be understood that the voltage superposition module 3 is used for superposing the voltages input by the base source voltage input module 1 and the compensation voltage input module 2, and the positions of the base source voltage input module 1 and the compensation voltage input module 2 can be switched, that is, the base source voltage input module 1 is electrically connected to the resistor R6, and the compensation voltage input module 2 is electrically connected to the resistor R5.
The voltage signal amplifying circuit in this embodiment is applied to, for example, a liquid crystal display, and is configured to amplify an ac voltage signal input by a pre-DAC module of the liquid crystal display, where the voltage signal is amplified and then used to control a pixel electrode. Specifically, the pre-DAC module 5 is, for example, a 12-bit pre-DAC module. When the 12-bit pre-DAC module is applied to a liquid crystal display, the alternating current voltage signal output by the 12-bit pre-DAC needs to be amplified by two times.
When the voltage signal amplification circuit of the present invention is used to amplify the voltage signal input from the pre-DAC module 5, the voltage signal input from the pre-DAC module 5 is denoted as Vdac, the voltage output from the node of the resistors R10 and R11 is denoted as Voffset, and the voltage output from the voltage superposition module 3 is denoted as Vdc, and the relationship between the output voltage V and the input voltage Vdac of the voltage signal amplification circuit of the present invention is: v (-R2/R1) Vdac + Vdc, wherein R2/R1 has a value of about 2 and Vdc is equal to 5. After multiple verification, the difference between the voltage signal input by the front-end DAC module 5 and the theoretical value amplification value after the actual amplification by the voltage signal amplification circuit is between plus or minus 10mv, the difference is small, and the amplification precision is high.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A voltage signal amplification circuit, comprising:
a base source voltage input module (1) for inputting a base source voltage;
a compensation voltage input module (2) for inputting a compensation voltage;
the voltage superposition module (3) is electrically connected with the base source voltage input module (1) and the compensation voltage input module (2), and the voltage superposition module (3) is used for superposing the base source voltage and the compensation voltage together and outputting superposed voltage; and
the bias amplification module (4) is electrically connected with the voltage superposition module (3), receives the superposed voltage output by the voltage superposition module (3) and the alternating current voltage signal output by the front DAC module (5), and performs bias amplification processing on the alternating current voltage signal;
the alternating current voltage signal output by the DAC module (5) is a bias non-zero alternating current voltage signal, and the compensation voltage input by the compensation voltage input module (2) is used for compensating the direct current bias voltage of the alternating current voltage signal output by the pre-DAC module (5).
2. The voltage signal amplifying circuit according to claim 1, wherein the bias amplifying module (4) comprises an operational amplifier U1 and resistors R1, R2, R3 and R4, one end of the resistor R1 and one end of the resistor R2 are electrically connected to the inverting input terminal of the operational amplifier U1, the other end of the resistor R1 is electrically connected to the pre-DAC module (5), the other end of the resistor R2 is electrically connected to the output terminal of the operational amplifier U1, one end of the resistor R3 and one end of the resistor R4 are electrically connected to the non-inverting input terminal of the operational amplifier U1, the other end of the resistor R3 is electrically connected to the voltage superposition module (3), and the other end of the resistor R4 is grounded.
3. The voltage signal amplifying circuit according to claim 2, wherein the voltage superposition module (3) comprises an operational amplifier U2 and resistors R5, R6, R7, R8 and R9, one end of the resistor R5, one end of the resistor R6 and one end of the resistor R7 are electrically connected to a non-inverting input terminal of the operational amplifier U2, the other end of the resistor R5 is electrically connected to the base source voltage input module (1), the other end of the resistor R6 is electrically connected to the compensation voltage input module (2), and the other end of the resistor R7 is grounded; one end of the resistor R8 and one end of the resistor R9 are both electrically connected with the inverting input end of the operational amplifier U2, the other end of the resistor R8 is grounded, the other end of the resistor R9 is electrically connected with the output end of the operational amplifier U2, and the output end of the operational amplifier U2 is electrically connected with the other end of the resistor R3.
4. The voltage signal amplifying circuit according to claim 3, wherein the base source voltage input module (1) comprises an operational amplifier U3 and a base source voltage source V1, a non-inverting input terminal of the operational amplifier U3 is connected to the base source voltage source V1, an inverting input terminal of the operational amplifier U3 is electrically connected to an output terminal of the operational amplifier U3, and an output terminal of the operational amplifier U3 is electrically connected to the other terminal of the resistor R5.
5. The voltage signal amplifying circuit according to claim 4, wherein the compensation voltage input module (2) comprises an operational amplifier U4, a resistor R10, a resistor R11, a voltage source V2 and a voltage source V3, wherein one end of the resistor R10 and one end of the resistor R11 are electrically connected to the non-inverting input end of the operational amplifier U4, one of the other end of the resistor R10 and the other end of the resistor R11 is electrically connected to the voltage source V3, and the other is electrically connected to the voltage source V2; the inverting input end of the operational amplifier U4 is electrically connected with the output end of the operational amplifier U4, and the output end of the operational amplifier U4 is electrically connected with the other end of the resistor R6; after the voltage source V2 and the voltage source V3 are divided by the resistor R10 and the resistor R11, the voltage provided to the non-inverting input terminal of the operational amplifier U4 is a positive voltage.
6. The voltage signal amplifying circuit of claim 5, wherein the resistor R11 has another end electrically connected to the voltage source V2, and the resistor R10 has another end electrically connected to the voltage source V3.
7. The voltage signal amplifying circuit of claim 5, wherein the resistor R11 has another end electrically connected to the voltage source V3, and the resistor R10 has another end electrically connected to the voltage source V2.
8. The voltage signal amplifying circuit according to claim 4, wherein the compensation voltage input module (2) is a programmable voltage generator, the compensation voltage input module (2) is electrically connected to a non-inverting input terminal of the operational amplifier U4 for providing a positive voltage to the non-inverting input terminal of the operational amplifier U4, an inverting input terminal of the operational amplifier U4 is electrically connected to the output terminal of the operational amplifier U4, and the other end of the resistor R6 is electrically connected to the output terminal of the operational amplifier U4.
9. The voltage signal amplification circuit of any one of claims 2-8, wherein the value of R2/R1 is 2.
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| CN201710985780.3A CN107819444B (en) | 2017-10-20 | 2017-10-20 | Voltage signal amplifying circuit |
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| CN201710985780.3A CN107819444B (en) | 2017-10-20 | 2017-10-20 | Voltage signal amplifying circuit |
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| CN109859710B (en) * | 2019-02-26 | 2021-09-17 | 昆山龙腾光电股份有限公司 | Gate drive circuit |
| CN110675796B (en) * | 2019-09-25 | 2022-08-02 | 昆山龙腾光电股份有限公司 | Wide-narrow viewing angle switching circuit, display device and viewing angle control method |
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