CN110010098B - Voltage conversion circuit - Google Patents
Voltage conversion circuit Download PDFInfo
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- CN110010098B CN110010098B CN201910330952.2A CN201910330952A CN110010098B CN 110010098 B CN110010098 B CN 110010098B CN 201910330952 A CN201910330952 A CN 201910330952A CN 110010098 B CN110010098 B CN 110010098B
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- constant low
- low voltage
- operational amplifier
- voltage
- power management
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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
- G09G3/3674—Details of drivers for scan electrodes
- G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a voltage conversion circuit. The voltage conversion circuit comprises a power supply management unit, an operational amplifier and a level conversion unit, wherein the input end of the power supply management unit is connected with a first constant low voltage, the output end of the power supply management unit is electrically connected with the non-inverting input end of the operational amplifier and outputs a middle constant low voltage, the inverting input end of the operational amplifier is electrically connected with the output end of the operational amplifier, the output end of the operational amplifier is electrically connected with the input end of the level conversion unit, the output end of the level conversion unit is electrically connected with a display panel and outputs a second constant low voltage, the voltage conversion circuit has strong driving capability, and the second constant low voltage drift caused by the existence of a leakage path of the display panel can be eliminated, so.
Description
Technical Field
The invention relates to the technical field of display, in particular to a voltage conversion circuit.
Background
Liquid Crystal Displays (LCDs) have many advantages such as thin body, power saving, no radiation, and the like, and are widely used. Such as: liquid crystal televisions, mobile phones, Personal Digital Assistants (PDAs), digital cameras, computer screens, notebook computer screens, or the like, are dominant in the field of flat panel displays.
The goa (gate Driver on array) technology is an array substrate line driving technology, which uses a Thin Film Transistor (TFT) liquid crystal display array process to fabricate a gate scanning driving circuit on a TFT array substrate to realize a line-by-line scanning driving mode, has the advantages of reducing production cost and realizing a narrow frame design of a panel, and is used for various displays. The GOA circuit has two basic functions: the first is to output a grid scanning driving signal to drive a grid line in a panel and open a TFT in a display area so as to charge a pixel; the second is a shift register function, when one gate scanning driving signal is output, the next gate scanning driving signal is output through clock control and is sequentially transmitted. The GOA technology can reduce the welding (bonding) process of an external chip (IC), so that the productivity is improved, the product cost is reduced, and the liquid crystal display panel is more suitable for manufacturing display products with narrow frames.
In the prior art, the GOA circuit needs to access two different first constant low voltages and second constant low voltages, the first constant low voltage is used for controlling the potential of a first node of a pull-up module pull-up scan signal in the pull-down GOA circuit, the second constant low voltage is used for controlling the potential of a pull-down scan signal, and the first constant low voltage is generally lower than the second constant low voltage. At present, a first constant low voltage is generally converted by a conversion circuit to obtain a second constant low voltage. For process reasons, the leakage path from the first constant low voltage to the second constant low voltage exists in the GOA circuit, which causes the second constant low voltage to be pulled down and deviate from the designed value (for example, deviate from the designed value of-6V to-8.9V), which can seriously affect the function of the circuit and the quality of the product.
Disclosure of Invention
The invention aims to provide a voltage conversion circuit which has strong driving capability and can eliminate the drift of a second constant low voltage caused by the existence of a leakage path of a display panel so as to stabilize the second constant low voltage.
In order to achieve the above object, the present invention provides a voltage converting circuit, which includes a power management unit, an operational amplifier, and a level converting unit; the input end of the power supply management unit is connected with a first constant low voltage, and the output end of the power supply management unit is electrically connected with the non-inverting input end of the operational amplifier and outputs a middle constant low voltage; the inverting input end of the operational amplifier is electrically connected with the output end of the operational amplifier, and the output end of the operational amplifier is electrically connected with the input end of the level conversion unit; the output end of the level conversion unit is used for being electrically connected with the display panel and outputting a second constant low voltage.
The first constant low voltage is less than the second constant low voltage, both the first constant low voltage and the second constant low voltage being less than 0.
The first constant low voltage is-10V to-10.5V, and the second constant low voltage is-5.5V to-6.5V.
The power management unit is integrated in a power management chip.
The power management unit and the operational amplifier are integrated in the same power management chip.
The power management unit comprises a triode, an emitting electrode of the triode is an input end of the power management unit, a collecting electrode of the triode is an output end of the power management unit, and a base electrode of the triode is connected with a control signal.
The voltage conversion circuit further comprises a resistor and a capacitor, wherein one end of the resistor is electrically connected with the output end of the operational amplifier, and the other end of the resistor is grounded; one end of the capacitor is electrically connected with the output end of the operational amplifier, and the other end of the capacitor is grounded.
And a positive power supply pin of the operational amplifier is connected with a positive voltage of a power supply, and a negative power supply pin of the operational amplifier is connected with a first constant low voltage.
The display panel comprises a GOA circuit, and the output end of the level conversion unit is electrically connected with the GOA circuit.
The maximum value of the current at the output end of the level conversion unit ranges from 50mA to 60 mA.
The invention has the beneficial effects that: the voltage conversion circuit comprises a power supply management unit, an operational amplifier and a level conversion unit, wherein the input end of the power supply management unit is connected with a first constant low voltage, the output end of the power supply management unit is electrically connected with the non-inverting input end of the operational amplifier and outputs a middle constant low voltage, the inverting input end of the operational amplifier is electrically connected with the output end of the operational amplifier, the output end of the operational amplifier is electrically connected with the input end of the level conversion unit, the output end of the level conversion unit is electrically connected with a display panel and outputs a second constant low voltage, the voltage conversion circuit has strong driving capability, and the second constant low voltage drift caused by the existence of a leakage path of the display panel can be eliminated, so.
Drawings
For a better understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention, taken in conjunction with the accompanying drawings, which are provided for purposes of illustration and description and are not intended to limit the invention.
In the drawings, there is shown in the drawings,
FIG. 1 is a schematic diagram of a first embodiment of a voltage converting circuit according to the present invention;
fig. 2 is a schematic structural diagram of a voltage conversion circuit according to a second embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Referring to fig. 1, a voltage converting circuit according to a first embodiment of the present invention includes a power management unit 10, an operational amplifier (OP)20, and a level converting unit 30. The input terminal of the power management unit 10 is connected to the first constant low voltage VSSQ, and the output terminal is electrically connected to the non-inverting input terminal of the operational amplifier 20 and outputs the intermediate constant low voltage VSS. The inverting input terminal of the operational amplifier 20 is electrically connected to the output terminal thereof, and the output terminal is electrically connected to the input terminal of the level shifting unit 30. The output end of the level shift unit 30 is electrically connected to the display panel 9, and the level shift unit 30 converts the voltage received by the input end thereof to generate a second constant low voltage VSSG and outputs the second constant low voltage VSSG from the output end thereof.
Specifically, the first constant low voltage VSSQ is smaller than the second constant low voltage VSSG, and both the first constant low voltage VSSQ and the second constant low voltage VSSG are smaller than 0.
Further, the first constant low voltage VSSQ is-10V to-10.5V, preferably-10.2V, and the second constant low voltage VSSG is-5.5V to-6.5V.
Specifically, the maximum value of the current at the output terminal of the level shift unit 30 ranges from 50mA to 60 mA.
Specifically, referring to fig. 1, in the first embodiment of the present invention, the power management unit 10 is integrated into a power management chip (PMIC)8, and the operational amplifier 20 is independently disposed outside the power management chip 8.
Specifically, the power management unit 10 includes a transistor Q1, an emitter of the transistor Q1 is an input terminal of the power management unit 10, a collector is an output terminal of the power management unit 10, a base is connected to the control signal CS, and the transistor Q1 is controlled by the control signal CS to convert the first constant low voltage VSSQ to generate and output the intermediate constant low voltage VSS.
Specifically, the voltage conversion circuit further includes a resistor R1 and a capacitor C1, wherein one end of the resistor R1 is electrically connected to the output terminal of the operational amplifier 20, and the other end is grounded. One end of the capacitor C1 is electrically connected to the output end of the operational amplifier 20, and the other end is grounded.
Specifically, the positive power supply pin of the operational amplifier 20 is connected to the positive power supply voltage VDD, and the negative power supply pin is connected to the first constant low voltage VSSQ. Preferably, the voltage value of the power supply positive voltage VDD is 3.3V.
Specifically, the display panel 9 includes a GOA circuit 91, and the output terminal of the level shifter 30 is electrically connected to the GOA circuit 91.
It should be noted that, in the voltage converting circuit according to the first embodiment of the present invention, by connecting an operational amplifier 20 to the output terminal of the power management unit 10 integrated in the power management chip 8, such that the non-inverting input terminal of the operational amplifier 20 is connected to the output terminal of the power management unit 10, the inverting input terminal is connected to the output terminal, and the output terminal is connected to the input terminal of the level converting unit 30, the maximum value of the current at the output terminal of the level converting unit 30 can be significantly increased, so that the driving capability of the voltage converting circuit is greatly enhanced, and through experimental calculation, when the first constant low voltage VSSQ is-10.2V, the maximum value of the current at the output terminal of the level converting unit 30 in the present invention is 53mA, the driving capability is strong, such that the second constant low voltage VSSG is stabilized at-6.06V, whereas in the converting circuit of the prior art for converting the first constant low, when the first constant low voltage is-10.2V, the current of the output end of the circuit is 25.2mA, the driving capability is weak, and the second constant low voltage can be pulled down to-8.96V due to the leakage in the GOA circuit, so that the voltage conversion circuit of the invention can effectively solve the problem of the drift of the second constant low voltage VSSG caused by the leakage path with very low cost under the condition that the leakage path of the GOA circuit 91 in the display panel 9 cannot be eliminated, so that the second constant low voltage VSSG is stable, and the normal operation of the GOA circuit 91 in the display panel 9 is ensured.
Referring to fig. 2, a voltage converting circuit according to a second embodiment of the present invention is different from the first embodiment in that the power management unit 10 and the operational amplifier 20 are integrated in the same power management chip 8', and the rest is the same as the first embodiment, which is not described herein again. In the second embodiment, the power management unit 10 and the operational amplifier 20 are integrated in the same power management chip 8', so that the circuit structure of the second embodiment is simpler, the integration of the circuit can be significantly improved, and the quality of the product can be improved.
In summary, the voltage converting circuit of the present invention includes a power management unit, an operational amplifier and a level converting unit, wherein an input terminal of the power management unit is connected to a first constant low voltage, an output terminal of the power management unit is electrically connected to a non-inverting input terminal of the operational amplifier and outputs a middle constant low voltage, an inverting input terminal of the operational amplifier is electrically connected to the output terminal of the operational amplifier, and the output terminal of the power management unit is electrically connected to an input terminal of the level converting unit, and an output terminal of the level converting unit is electrically connected to a display panel and outputs a second constant low voltage.
As described above, it will be apparent to those skilled in the art that other various changes and modifications may be made based on the technical solution and concept of the present invention, and all such changes and modifications are intended to fall within the scope of the appended claims.
Claims (9)
1. A voltage conversion circuit is characterized by comprising a power management unit (10), an operational amplifier (20) and a level conversion unit (30); the input end of the power management unit (10) is connected to a first constant low Voltage (VSSQ), and the output end of the power management unit is electrically connected to the non-inverting input end of the operational amplifier (20) and outputs a middle constant low Voltage (VSS); the inverting input end of the operational amplifier (20) is electrically connected with the output end of the operational amplifier, and the output end of the operational amplifier is electrically connected with the input end of the level conversion unit (30); the output end of the level conversion unit (30) is used for being electrically connected with the display panel (9) and outputting a second constant low Voltage (VSSG);
the power management unit (10) comprises a triode (Q1), an emitter of the triode (Q1) is an input end of the power management unit (10), a collector of the triode is an output end of the power management unit (10), and a base of the triode is connected with a Control Signal (CS).
2. The voltage conversion circuit of claim 1, wherein the first constant low Voltage (VSSQ) is less than a second constant low Voltage (VSSG), and wherein both the first constant low Voltage (VSSQ) and the second constant low Voltage (VSSG) are less than 0.
3. The voltage conversion circuit of claim 2, wherein the first constant low Voltage (VSSQ) is between-10V and-10.5V, and the second constant low Voltage (VSSG) is between-5.5V and-6.5V.
4. The voltage conversion circuit according to claim 1, wherein the power management unit (10) is integrated in a power management chip (8).
5. The voltage conversion circuit according to claim 1, wherein the power management unit (10) and the operational amplifier (20) are integrated in the same power management chip (8').
6. The voltage conversion circuit of claim 1, further comprising a resistor (R1) and a capacitor (C1), wherein one end of the resistor (R1) is electrically connected to the output terminal of the operational amplifier (20), and the other end is grounded; one end of the capacitor (C1) is electrically connected with the output end of the operational amplifier (20), and the other end is grounded.
7. The voltage conversion circuit of claim 1, wherein a positive power supply pin of the operational amplifier (20) is connected to a positive power supply Voltage (VDD) and a negative power supply pin is connected to a first constant low Voltage (VSSQ).
8. The voltage converting circuit according to claim 1, wherein the display panel (9) comprises a GOA circuit (91), and an output terminal of the level converting unit (30) is electrically connected to the GOA circuit (91).
9. The voltage conversion circuit according to claim 1, wherein the maximum value of the current at the output terminal of the level conversion unit (30) ranges from 50mA to 60 mA.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910330952.2A CN110010098B (en) | 2019-04-23 | 2019-04-23 | Voltage conversion circuit |
| PCT/CN2019/090035 WO2020215450A1 (en) | 2019-04-23 | 2019-06-04 | Voltage conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910330952.2A CN110010098B (en) | 2019-04-23 | 2019-04-23 | Voltage conversion circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110010098A CN110010098A (en) | 2019-07-12 |
| CN110010098B true CN110010098B (en) | 2020-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910330952.2A Active CN110010098B (en) | 2019-04-23 | 2019-04-23 | Voltage conversion circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110010098B (en) |
| WO (1) | WO2020215450A1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014089250A (en) * | 2012-10-29 | 2014-05-15 | Mitsubishi Electric Corp | Potential generation circuit and liquid crystal display device |
| CN102983744B (en) * | 2012-12-25 | 2015-04-01 | 深圳市华星光电技术有限公司 | DC/DC module for LCD driving circuit |
| US10522090B2 (en) * | 2015-04-02 | 2019-12-31 | Sharp Kabushiki Kaisha | Display device including output control circuits |
| CN105489187B (en) * | 2016-01-27 | 2018-04-10 | 上海天马微电子有限公司 | Produce the circuit and its liquid crystal display of the common electric voltage for liquid crystal panel |
| CN107516503B (en) * | 2017-10-12 | 2020-01-31 | 深圳市华星光电技术有限公司 | Liquid crystal panel driving circuit and liquid crystal panel driving method |
| CN208225476U (en) * | 2018-05-21 | 2018-12-11 | 惠州高盛达科技有限公司 | Apply the voltage transfer circuit in GOA screen |
| CN109634338A (en) * | 2018-12-18 | 2019-04-16 | 北京集创北方科技股份有限公司 | Power circuit, control method and display system |
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2019
- 2019-04-23 CN CN201910330952.2A patent/CN110010098B/en active Active
- 2019-06-04 WO PCT/CN2019/090035 patent/WO2020215450A1/en active Application Filing
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| Publication number | Publication date |
|---|---|
| WO2020215450A1 (en) | 2020-10-29 |
| CN110010098A (en) | 2019-07-12 |
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Address after: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee after: TCL Huaxing Photoelectric Technology Co.,Ltd. Address before: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee before: Shenzhen China Star Optoelectronics Technology Co.,Ltd. |