CN115171623A - Drive circuit and display device - Google Patents
Drive circuit and display device Download PDFInfo
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- CN115171623A CN115171623A CN202210946143.6A CN202210946143A CN115171623A CN 115171623 A CN115171623 A CN 115171623A CN 202210946143 A CN202210946143 A CN 202210946143A CN 115171623 A CN115171623 A CN 115171623A
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- voltage
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- operational amplifier
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- 239000003990 capacitor Substances 0.000 claims description 26
- 239000004973 liquid crystal related substance Substances 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 241001270131 Agaricus moelleri Species 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
Abstract
The present disclosure provides a driving circuit and a display device. The drive circuit includes: power management circuit, compensating circuit and display driver chip, power management circuit treat that steady voltage constant voltage output is connected compensating circuit's first input, display driver chip treat that steady voltage constant voltage input is connected compensating circuit's second input and output, compensating circuit be used for with treat that the voltage fluctuation of steady voltage constant voltage input superposes in antiphase first input, in order to restrain treat the voltage fluctuation of steady voltage constant voltage input, wherein, compensating circuit's first input, second input and the direct current component of output equal. The performance of the display driving chip in the driving circuit is more stable.
Description
Technical Field
The disclosure belongs to the technical field of display, and particularly relates to a driving circuit and a display device.
Background
This section is intended to provide a background or context to the embodiments recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
In a display device, such as a television, an electronic billboard, and a smart phone, a power management circuit provides a specific constant voltage signal to a display driver chip. For example, the liquid crystal display driving chip needs to receive a stable half voltage, a positive voltage of the 0 gray scale, and a negative voltage of the 0 gray scale. The half-voltage is a reference voltage required by the internal work of the liquid crystal display driving chip and is between 0 gray scale positive polarity voltage and 0 gray scale negative polarity voltage. The variation of the internal working state of the liquid crystal display driving chip can cause the fluctuation of half-voltage, thereby causing abnormal display.
Disclosure of Invention
The present disclosure provides a driving circuit and a display device.
The technical scheme adopted by the disclosure is as follows: a drive circuit, comprising: power management circuit, compensating circuit and display driver chip, power management circuit treats that steady voltage constant voltage output is connected compensating circuit's first input, display driver chip treats that steady voltage constant voltage input is connected compensating circuit's second input and output, compensating circuit be used for with treat that the voltage fluctuation of steady voltage constant voltage input superposes in antiphase first input, in order to restrain treat the voltage fluctuation of steady voltage constant voltage input, wherein, compensating circuit's first input, second input and the direct current component of output equal.
In some embodiments, the compensation circuit comprises: the circuit comprises a first capacitor, a first resistor, a second resistor and an operational amplifier; the first input end of the compensation circuit is respectively connected with the first end of the first capacitor and the output end of the compensation circuit, the second end of the first capacitor is connected with the reverse input end of the operational amplifier through the first resistor, the second input end of the compensation circuit is connected with the non-inverting input end of the operational amplifier, the reverse input end of the operational amplifier is further connected with the output end of the operational amplifier through the second resistor, and the output end of the operational amplifier is electrically connected with the output end of the compensation circuit.
In some embodiments, the compensation circuit further comprises: a second capacitor; the first end of the second capacitor is connected with the positive input end of the operational amplifier, and the second end of the second capacitor is grounded.
In some embodiments, the output of the operational amplifier is connected to the output of the compensation circuit through a third resistor.
In some embodiments, the output of the compensation circuit is connected to ground through a fourth resistor.
In some embodiments, the driving circuit is configured to drive a liquid crystal display panel, and the constant voltage output terminal to be stabilized is configured to provide a half-voltage to the display driving chip, where the half-voltage is between a positive polarity voltage of a 0 gray scale and a negative polarity voltage of the 0 gray scale received by the display driving chip.
The technical scheme adopted by the disclosure is as follows: a display device comprises a display panel and the driving circuit, wherein a display driving chip in the driving circuit is used for driving the display panel.
In some embodiments, the display panel is a liquid crystal display panel, and the constant voltage output terminal to be stabilized of the display driving chip is configured to provide a half-voltage to the display driving chip, where the half-voltage is between a positive polarity voltage of 0 gray scale and a negative polarity voltage of 0 gray scale received by the display driving chip.
Drawings
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present disclosure.
Fig. 2 is a circuit diagram of a compensation circuit of an embodiment of the disclosure.
Fig. 3 is a waveform diagram of a half-voltage received by a display driving chip of a comparative display device according to the present disclosure.
Fig. 4 is a waveform diagram of a half-voltage received by a display driving chip of a display device according to an embodiment of the disclosure.
The reference numbers are as follows: 1. a display panel; 2. a display driving chip; 3. a compensation circuit; 4. a power management circuit; g9 and 0 gray scale positive polarity voltage output ends; g10, 0 gray scale negative polarity voltage output end; HAVDD, a half-voltage input end received by the display driving chip; HAVDo, a half-voltage output end of a power management circuit; AVDD, power supply terminal; p1, a first input end; p2, a second input end; out, an output end; r1 and a first resistor; r2 and a second resistor; r3 and a third resistor; r4 and a fourth resistor; c1, a first capacitor; c2, a second capacitor; c3, a third capacitor; A. an operational amplifier.
Detailed Description
The disclosure will be further described with reference to the embodiments shown in the drawings.
Referring to fig. 1 and 2, an embodiment of the present disclosure provides a driving circuit including: the power management circuit 4, the compensating circuit 3 and the display driver chip 2, the constant voltage output end of waiting to stabilize of the power management circuit 4 is connected with the first input end P1 of the compensating circuit 3, the constant voltage input end of waiting to stabilize of the display driver chip 2 is connected with the second input end P2 and the output end of the compensating circuit 3, the compensating circuit 3 is used for superposing the voltage fluctuation of the constant voltage input end of waiting to stabilize on the first input end P1 in a reversed phase manner, so as to restrain the voltage fluctuation of the constant voltage input end of waiting to stabilize, wherein, the direct current components of the first input end P1, the second input end P2 and the output end Out of the compensating circuit 3 are equal.
The power management circuit 4 supplies various reference voltages to the display driving chip 2. For example, the half-voltage output terminal HAVDDo of the power management circuit 4 outputs a half-voltage; a 0 gray scale positive polarity voltage output end G9 of the power management circuit 4 outputs a 0 gray scale positive polarity voltage; the 0-gray scale negative polarity voltage output terminal G10 of the power management current outputs a 0-gray scale negative polarity voltage.
In some embodiments, the positive voltage of the 0 gray scale is 9V, the negative voltage of the 0 gray scale is 8V, and the half voltage is 8.5V. Of course, the half-voltage may be greater than the average of the positive voltage of the 0 gray scale and the negative voltage of the 0 gray scale, or may be less than the average of the positive voltage of the 0 gray scale and the negative voltage of the 0 gray scale. The voltage value of the half-voltage can be adjusted by experiment. If the voltage value of the half-voltage is greater than or equal to the positive polarity voltage of the 0 gray scale, or the voltage value of the half-voltage is less than or equal to the negative polarity voltage of the 0 gray scale, the operating state of the display driving chip is greatly affected.
The display driving chip 2 performs an operation according to the received various reference voltages to obtain driving voltages of the respective gray scales, and then outputs the driving voltages of the respective gray scales to the display panel 1.
When the display driver chip 2 displays a jitter (flicker) screen, the fluctuation of the half-voltage may be caused by a drastic change of the internal operating state of the display driver chip 2.
Referring to fig. 3, in a comparative example of the present disclosure, a half-voltage output terminal HAVDDo of the power management circuit 4 is directly connected to a half-voltage input terminal HAVDD of the display driving chip 2 through a wire. The half-voltage of the half-voltage input terminal HAVDD of the display driving chip 2 is severely jittered, which seriously affects the display effect.
In the embodiment of the present disclosure, the half-voltage input terminal HAVDD of the display driving chip 2 is used as the constant-voltage input terminal to be stabilized, and the half-voltage output terminal HAVDDo of the power management circuit 4 is used as the constant-voltage output terminal to be stabilized. Of course, the constant voltage input terminal to be regulated may also be other types of constant voltage input terminals of the display driver chip 2.
The compensation circuit 3 is a negative feedback circuit that applies the alternating-current signal at the constant-voltage-to-be-stabilized input terminal of the display driver chip 2 in reverse to the corresponding constant-voltage-to-be-stabilized output terminal in the power management circuit 4, thereby suppressing the voltage fluctuation at the constant-voltage-to-be-stabilized input terminal of the display driver chip 2.
In the display device shown in fig. 1, the compensation circuit 3 provides the regulated half-voltage for the 5 display driving chips 2, and provides the positive polarity voltage of the 0 gray scale and the negative polarity voltage of the 0 gray scale for the 5 display driving chips 2. For simplicity of the screen, only 3 traces leading from the power management circuit 4 are shown in fig. 1.
In some large-sized display devices, the number of display driving chips 2 connected to one display panel 1 is larger, and 2 power management circuits 4 and 2 compensation circuits 3 are disposed in one display device in a one-to-one correspondence. Each power management circuit 4 and corresponding compensation circuit 3 provides various types of reference voltages for half the number of display driver chips 2.
In some embodiments, referring to fig. 2, the compensation circuit 3 includes: the circuit comprises a first capacitor C1, a first resistor R1, a second resistor R2 and an operational amplifier A; the first input end P1 of the compensation circuit 3 is respectively connected with the first end of the first capacitor C1 and the output end of the compensation circuit 3, the second end of the first capacitor C1 is connected with the reverse input end of the operational amplifier A through the first resistor R1, the second input end P2 of the compensation circuit 3 is connected with the non-inverting input end of the operational amplifier A, the reverse input end of the operational amplifier A is further connected with the output end of the operational amplifier A through the second resistor R2, and the output end of the operational amplifier A is electrically connected with the output end of the compensation circuit 3.
The voltage values of the non-inverting input terminal and the inverting input terminal of the operational amplifier a are approximately equal, and the input currents of the non-inverting input terminal and the inverting input terminal of the operational amplifier a are approximately 0. From this it can be determined:
and then, pushing out:
wherein Δ HAVDD is a voltage variation of the half-voltage input terminal HAVDD, Δ HAVDDo is a voltage variation of the half-voltage output terminal HAVDDo, R1 is a resistance value of the first resistor R1, and R2 is a resistance value of the second resistor R2.
In some embodiments, referring to fig. 2, the compensation circuit 3 further comprises: a second capacitor C2; the first end of the second capacitor C2 is connected to the positive input end of the operational amplifier a, and the second end of the second capacitor C2 is grounded. The second capacitor C2 is used for filtering the voltage of the positive input terminal of the operational amplifier a and filtering an alternating current component at the positive input terminal of the operational amplifier a.
In some embodiments, referring to fig. 2, the output of the operational amplifier a is connected to the output of the compensation circuit 3 through a third resistor R3. The third resistor R3 has a relatively small resistance value for suppressing small voltage fluctuations of the half-voltage input terminal HAVDD.
In some embodiments, referring to fig. 2, the output terminal Out of the compensation circuit 3 is grounded through a fourth resistor R4. The fourth resistor R4 may be a varistor and functions as an overvoltage protection.
In particular, also shown in fig. 2 is a third capacitor C3 for stabilizing the supply voltage (supplied by supply terminal AVDD) received by the operational amplifier a.
In an embodiment of the disclosure, the resistance of the first resistor R1 is 1K Ω, the resistance of the second resistor R2 is 102K Ω, the resistance of the third resistor R3 is 10 Ω, the capacitance of the first capacitor C1 is 100nF, the capacitance of the second capacitor C2 is 100nF, and the capacitance of the third capacitor C3 is 100nF. In the actually measured waveform of fig. 4, the half-voltage is always kept between the 0-gray-scale positive polarity voltage and the 0-gray-scale negative polarity voltage. The half-piezoelectric voltage is always smaller than the positive voltage of the 0 gray scale and is always larger than the negative voltage of the 0 gray scale, and the fluctuation amplitude of the half-piezoelectric voltage is also suppressed.
Whereas in the comparative example shown in fig. 3, the half-voltage fluctuation amplitude is large. The half voltage is greater than the 0 gray-scale positive polarity voltage even in some periods.
It can be determined that the compensation circuit 3 provided in the embodiment of the present disclosure effectively suppresses the fluctuation of the half-voltage, which is beneficial to the stability of the display screen.
In some embodiments, the driving circuit is used for driving the liquid crystal display panel 1, and the constant voltage output terminal to be stabilized is used for providing a half-voltage to the display driving chip 2, where the half-voltage is between the positive voltage of the 0 gray scale and the negative voltage of the 0 gray scale received by the display driving chip 2.
Based on the same inventive concept as the previous embodiment, referring to fig. 1, an embodiment of the present disclosure further provides a display device, which includes a display panel 1 and the previous driving circuit, wherein a display driving chip 2 in the driving circuit is used for driving the display panel 1.
In some embodiments, the display panel 1 is a liquid crystal display panel 1, and the constant voltage output terminal to be stabilized of the display driver chip is configured to provide a half-voltage to the display driver chip 2, where the half-voltage is between the positive polarity voltage of the 0 gray scale and the negative polarity voltage of the 0 gray scale received by the display driver chip 2.
In the embodiment of the disclosure, the display device can be any product or component with a display function, such as a display module, a display, a mobile phone, a tablet computer, a television, an electronic billboard, and the like.
The present disclosure does not limit the display type of the display device, and the display device may be, for example, a liquid crystal display device, a light emitting diode display device, or the like.
The embodiments in the disclosure are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments.
The scope of the present disclosure is not limited to the above-described embodiments, and it is apparent that various modifications and variations can be made to the present disclosure by those skilled in the art without departing from the scope and spirit of the present disclosure. It is intended that the present disclosure also cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (8)
1. A driver circuit, comprising: power management circuit, compensating circuit and display driver chip, power management circuit treat that steady voltage constant voltage output is connected compensating circuit's first input, display driver chip treat that steady voltage constant voltage input is connected compensating circuit's second input and output, compensating circuit be used for with treat that the voltage fluctuation of steady voltage constant voltage input superposes in antiphase first input, in order to restrain treat the voltage fluctuation of steady voltage constant voltage input, wherein, compensating circuit's first input, second input and the direct current component of output equal.
2. The driving circuit according to claim 1, wherein the compensation circuit comprises: the circuit comprises a first capacitor, a first resistor, a second resistor and an operational amplifier; the first input end of the compensation circuit is respectively connected with the first end of the first capacitor and the output end of the compensation circuit, the second end of the first capacitor is connected with the reverse input end of the operational amplifier through the first resistor, the second input end of the compensation circuit is connected with the non-inverting input end of the operational amplifier, the reverse input end of the operational amplifier is further connected with the output end of the operational amplifier through the second resistor, and the output end of the operational amplifier is electrically connected with the output end of the compensation circuit.
3. The driving circuit of claim 2, wherein the compensation circuit further comprises: a second capacitor; the first end of the second capacitor is connected with the positive input end of the operational amplifier, and the second end of the second capacitor is grounded.
4. The driving circuit of claim 2, wherein the output terminal of the operational amplifier is connected to the output terminal of the compensation circuit through a third resistor.
5. The driving circuit of claim 2, wherein the output of the compensation circuit is connected to ground through a fourth resistor.
6. The driving circuit of claim 1, wherein the driving circuit is configured to drive a liquid crystal display panel, and the constant voltage output terminal to be stabilized is configured to provide a half-voltage to the display driving chip, wherein the half-voltage is between a positive polarity voltage of a 0 gray scale and a negative polarity voltage of the 0 gray scale received by the display driving chip.
7. A display device comprising a display panel and the driving circuit according to any one of claims 1 to 6, wherein a display driving chip in the driving circuit is configured to drive the display panel.
8. The display device according to claim 7, wherein the display panel is a liquid crystal display panel, the constant voltage output terminal to be stabilized is used for providing a half-voltage to the display driving chip, and the half-voltage is between a 0-gray scale positive polarity voltage and a 0-gray scale negative polarity voltage received by the display driving chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210946143.6A CN115171623B (en) | 2022-08-08 | 2022-08-08 | Driving circuit and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210946143.6A CN115171623B (en) | 2022-08-08 | 2022-08-08 | Driving circuit and display device |
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| CN115171623A true CN115171623A (en) | 2022-10-11 |
| CN115171623B CN115171623B (en) | 2024-04-09 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101311779A (en) * | 2007-05-25 | 2008-11-26 | 群康科技(深圳)有限公司 | LCD device |
| CN202110800U (en) * | 2011-05-18 | 2012-01-11 | 京东方科技集团股份有限公司 | Common voltage corrector, LCD drive device and LCD |
| CN104050942A (en) * | 2014-06-10 | 2014-09-17 | 京东方科技集团股份有限公司 | Common voltage driver compensation unit and method and display panel |
| CN106023877A (en) * | 2016-08-15 | 2016-10-12 | 京东方科技集团股份有限公司 | Public voltage adjusting circuit and method and display panel and device |
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2022
- 2022-08-08 CN CN202210946143.6A patent/CN115171623B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101311779A (en) * | 2007-05-25 | 2008-11-26 | 群康科技(深圳)有限公司 | LCD device |
| CN202110800U (en) * | 2011-05-18 | 2012-01-11 | 京东方科技集团股份有限公司 | Common voltage corrector, LCD drive device and LCD |
| CN104050942A (en) * | 2014-06-10 | 2014-09-17 | 京东方科技集团股份有限公司 | Common voltage driver compensation unit and method and display panel |
| CN106023877A (en) * | 2016-08-15 | 2016-10-12 | 京东方科技集团股份有限公司 | Public voltage adjusting circuit and method and display panel and device |
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| CN115171623B (en) | 2024-04-09 |
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