CN107705763B - Level conversion circuit and liquid crystal display device - Google Patents
Level conversion circuit and liquid crystal display device Download PDFInfo
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- CN107705763B CN107705763B CN201710949422.7A CN201710949422A CN107705763B CN 107705763 B CN107705763 B CN 107705763B CN 201710949422 A CN201710949422 A CN 201710949422A CN 107705763 B CN107705763 B CN 107705763B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 27
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims description 18
- 230000005669 field effect Effects 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims 4
- 230000001960 triggered effect Effects 0.000 abstract description 9
- 230000003111 delayed effect Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000000758 substrate Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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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
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/0289—Details of voltage level shifters arranged for use in a driving circuit
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- Crystallography & Structural Chemistry (AREA)
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- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a level conversion circuit and a liquid crystal display device. The level conversion circuit comprises a level conversion chip and an overcurrent protection starting circuit, the overcurrent protection starting circuit comprises an acquisition module, a comparator, a switch tube and a first voltage division unit, in operation, the acquisition module acquires a constant voltage high potential to increase the voltage of the in-phase input end of the comparator, when the voltage of the in-phase input end of the comparator is greater than a reference voltage, the comparator outputs a high level to switch on the switch tube, the detection end of the level conversion chip is grounded through the first voltage division unit, so that the level conversion chip starts overcurrent protection, the starting time of the overcurrent protection of the level conversion chip can be delayed, and the overcurrent protection is effectively prevented from being triggered by a large current error generated by starting the liquid crystal display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to a level conversion circuit and a liquid crystal display device.
Background
Liquid Crystal Display (LCD) devices have many advantages such as thin body, power saving, and no radiation, and are widely used, for example: 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.
Most of the existing liquid crystal display devices in the market are Backlight liquid crystal display devices, which include a liquid crystal display panel and a Backlight Module (Backlight Module). The liquid crystal display panel operates on the principle that liquid crystal molecules are filled between a Thin Film Transistor Array Substrate (TFT Array Substrate) and a Color Filter Substrate (CF), and a driving voltage is applied to the two substrates to control the rotation direction of the liquid crystal molecules, so that light of the backlight module is refracted out to generate a picture.
With the continuous development of the manufacturing technology of the liquid crystal display device industry, cost reduction is one of the most important development directions in the industry at present. In addition to optimizing the manufacturing process of the liquid crystal display device and developing new materials to reduce the production cost, integrating related functional modules, circuits, etc. into the liquid crystal display panel, for example, directly manufacturing a Gate scan Driver on Array (GOA) on a thin film transistor Array substrate to replace an external Gate scan Driver IC by using an Array manufacturing process is also a hot point content of development of many liquid crystal display panel manufacturers to further reduce the production cost. The GOA technology can use the array process of the liquid crystal display panel to manufacture the gate driving circuit on the TFT array substrate, thereby realizing the driving mode of scanning the gate line by line. Several clock signals are generally required to be accessed in the GOA circuit to realize the function of scanning the gate line by line. Conventionally, an initial clock signal is boosted by a level shifter chip (level shifter IC) and then output to a GOA circuit of a liquid crystal display panel. Because the clock signal wiring inside the GOA is more, because the reason of processing procedure, the short circuit appears easily, in order to prevent that liquid crystal display panel from being burnt out, the level conversion chip of prior art generally has overcurrent protection function, and when having overcurrent, the level conversion chip triggers overcurrent protection and stops outwards outputting clock signal, can effectively avoid the problem of the fused screen that leads to by the clock signal short circuit. In the actual use process of the liquid crystal display device, due to the rapid startup and shutdown, when the liquid crystal display device is started up for the second time, part of grid lines are not closed, and at the moment, large current can be generated to trigger overcurrent protection.
Disclosure of Invention
The invention aims to provide a level conversion circuit which can delay the starting time of the overcurrent protection of a level conversion chip and effectively avoid the overcurrent protection from being triggered by a large current error generated by the startup of a liquid crystal display device.
Another objective of the present invention is to provide a liquid crystal display device, which can effectively avoid the overcurrent protection from being triggered by a large current due to the power-on of the liquid crystal display device.
In order to achieve the above object, the present invention first provides a level shift circuit, which includes a level shift chip and an over-current protection start circuit electrically connected to the level shift chip;
the overcurrent protection starting circuit comprises an acquisition module, a comparator, a switching tube and a first voltage division unit;
the input end of the acquisition module is connected with a constant-voltage high potential, and the output end of the acquisition module is electrically connected with the non-inverting input end of the comparator;
the inverting input end of the comparator is connected with a reference voltage, and the output end of the comparator is electrically connected with the control end of the switching tube;
the first end of the switch tube is grounded, and the second end of the switch tube is electrically connected with the first end of the first voltage division unit;
the second end of the first voltage division unit is electrically connected with the detection end of the level conversion chip;
the level conversion chip starts over-current protection when the detection end of the level conversion chip is grounded through the first voltage division unit.
The acquisition module comprises a first acquisition unit and a second acquisition unit;
the input end of the first acquisition unit is connected with a constant-voltage high potential, and the output end of the first acquisition unit is electrically connected with the input end of the second acquisition unit; the output end of the second acquisition unit is electrically connected with the non-inverting input end of the comparator.
The acquisition module further comprises a third acquisition unit; the input end of the third acquisition unit is electrically connected with the output end of the first acquisition unit, and the output end of the third acquisition unit is grounded.
The first acquisition unit comprises a second resistor and a first capacitor; the first end of the second resistor is connected with a constant-voltage high potential, and the second end of the second resistor is electrically connected with the input end of the second acquisition unit; the first end and the second end of the first capacitor are respectively and electrically connected with the first end and the second end of the second resistor.
The second acquisition unit comprises a fourth resistor, wherein the first end of the fourth resistor is electrically connected with the output end of the first acquisition unit, and the second end of the fourth resistor is electrically connected with the control end of the switch tube.
The third acquisition unit comprises a third resistor and a second capacitor, the first end of the third resistor is electrically connected with the output end of the first acquisition unit, and the second end of the third resistor is grounded; the first end and the second end of the second capacitor are respectively and electrically connected with the first end and the second end of the third resistor.
The switch tube is an N-type field effect tube, the grid electrode of the N-type field effect tube is the control end of the switch tube, the source electrode is the first end of the switch tube, and the drain electrode is the second end of the switch tube.
The first voltage division unit comprises a first resistor, wherein a first end of the first resistor is electrically connected with a second end of the switch tube, and a second end of the first resistor is electrically connected with a detection end of the level conversion chip.
The invention also provides a liquid crystal display device which comprises the level conversion circuit.
The invention has the beneficial effects that: the invention provides a level conversion circuit, which comprises a level conversion chip and an overcurrent protection starting circuit, wherein the overcurrent protection starting circuit comprises an acquisition module, a comparator, a switching tube and a first voltage division unit, when the overcurrent protection starting circuit works, the acquisition module acquires a constant-voltage high potential to increase the voltage of a non-inverting input end of the comparator, when the voltage of the non-inverting input end of the comparator is greater than a reference voltage, the comparator outputs a high level to conduct the switching tube, a detection end of the level conversion chip is grounded through the first voltage division unit, so that the level conversion chip starts overcurrent protection, the starting time of the overcurrent protection of the level conversion chip can be delayed, and the overcurrent protection can be effectively prevented from being triggered by a large current generated by starting of a liquid crystal display device. The liquid crystal display device provided by the invention can effectively avoid the phenomenon that overcurrent protection is triggered by mistake due to large current generated by starting the liquid crystal display device.
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 circuit diagram of a level shift circuit according to 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, the present invention provides a level shift circuit, which includes a level shift chip 100 and an over-current protection starting circuit 200 electrically connected to the level shift chip 100;
the overcurrent protection starting circuit 200 includes an acquisition module 210, a comparator a1, a switching tube 220, and a first voltage division unit 230;
the input end of the acquisition module 210 is connected to a constant voltage high potential VGH, and the output end is electrically connected to the non-inverting input end of the comparator a 1;
the inverting input end of the comparator A1 is connected to the reference voltage VREF, and the output end is electrically connected to the control end of the switch tube 220;
the first end of the switch tube 220 is grounded, and the second end is electrically connected to the first end of the first voltage dividing unit 230;
the second terminal of the first voltage division unit 230 is electrically connected to the detection terminal of the level shift chip 100;
the level shift chip 100 activates the over-current protection when the detection terminal thereof is grounded through the first voltage division unit 230.
Specifically, the acquisition module 210 includes a first acquisition unit 211 and a second acquisition unit 212;
the input end of the first collecting unit 211 is connected to a constant voltage high potential VGH, and the output end is electrically connected to the input end of the second collecting unit 212; the output terminal of the second collecting unit 212 is electrically connected to the non-inverting input terminal of the comparator a 1.
Specifically, the first collecting unit 211 comprises a second resistor R2 and a first capacitor C1; a first end of the second resistor R2 is connected to the constant voltage high potential VGH, and a second end is electrically connected to the input end of the second acquisition unit 212; the first end and the second end of the first capacitor C1 are electrically connected to the first end and the second end of the second resistor R2, respectively.
Specifically, the second collecting unit 212 includes a fourth resistor R4, a first end of the fourth resistor R4 is electrically connected to the output end of the first collecting unit 211, and a second end of the fourth resistor R4 is electrically connected to the control end of the switch tube 220.
Further, the acquisition module 210 further includes a third acquisition unit 213; the input end of the third collecting unit 213 is electrically connected to the output end of the first collecting unit 211, and the output end is grounded.
Specifically, the third collecting unit 213 includes a third resistor R3 and a second capacitor C2, a first end of the third resistor R3 is electrically connected to the output end of the first collecting unit 211, and a second end is grounded; the first end and the second end of the second capacitor C2 are electrically connected to the first end and the second end of the third resistor R3, respectively.
Specifically, the switch tube 220 is an N-type field effect transistor Q1, the gate of the N-type field effect transistor Q1 is the control terminal of the switch tube 220, the source is the first terminal of the switch tube 220, and the drain is the second terminal of the switch tube 220.
Specifically, the first voltage divider unit 230 includes a first resistor R1, a first end of the first resistor R1 is electrically connected to a second end of the switch tube 220, and a second end of the first resistor R1 is electrically connected to a detection end of the level shifter chip 100.
It should be noted that, after the liquid crystal display device is turned on, the collecting module 210 collects the constant voltage high voltage VGH output by the driving circuit of the liquid crystal display device, and increases the voltage input to the non-inverting input terminal of the comparator a1, specifically, the constant voltage high voltage VGH is divided by the second resistor R2 and the third resistor R3, so that the voltage of the second terminal of the second resistor R2, that is, the first terminal of the fourth resistor R4, is increased, and further the voltage of the second terminal of the fourth resistor R4, that is, the non-inverting input terminal voltage of the comparator a1, is increased, and due to the existence of the first capacitor C1 and the second capacitor C2, the voltage of the second terminal of the fourth resistor R4, that is, the non-inverting input terminal voltage of the comparator a1, needs to be increased to be greater than the reference voltage VREF after a period of time, before the voltage of the non-inverting input terminal of the comparator a1 is greater than the reference voltage VREF, the output of the output terminal of the comparator a1 is all low level, the switch tube 220 is turned off, the first terminal of the first voltage dividing unit 230 is in an open circuit state, at this time, the level converting chip 100 does not start over current protection, when the voltage of the non-inverting input terminal of the comparator a1 is charged to be greater than the reference voltage VREF, the output terminal of the comparator a1 outputs high level, the switch tube 220 is turned on, the first terminal of the first voltage dividing unit 230 is grounded through the switched-on switch tube 220, so that the detecting terminal of the level converting chip 100 is grounded through the first voltage dividing unit 230, the level converting chip 100 starts over current protection, at this time, the voltage of the non-inverting input terminal of the comparator a1 is increased to be greater than the reference voltage VREF, the starting time of the level converting chip 100 over current protection is delayed, and the over current protection is effectively prevented from being triggered by a large current.
Further, the time when the voltage of the non-inverting input terminal of the comparator a1 increases to be greater than the reference voltage VREF can be controlled by adjusting the resistance values of the second resistor R2, the third resistor R3, and the fourth resistor R4, the capacitance values of the first capacitor C1 and the second capacitor C2, and the voltage value of the reference voltage VREF, that is, the starting time of the over-current protection of the level conversion chip 100 is controllable.
It is worth mentioning that, in order to simplify the circuit and reduce the number of components of the circuit, the acquisition module 210 may also only include the first acquisition unit 211 and the second acquisition unit 212, when in operation, the constant voltage high voltage VGH is divided by the second resistor R2, so that the voltage of the second end of the second resistor R2, that is, the first end of the fourth resistor R4 is increased, and further the voltage of the second end of the fourth resistor R4, that is, the voltage of the non-inverting input terminal of the comparator a1 is increased, and due to the existence of the first capacitor C1, the voltage of the second end of the fourth resistor R4, that is, the voltage of the non-inverting input terminal of the comparator a1, needs to be increased to be greater than the reference voltage VREF after a period of time, and the effect of the present invention can be achieved as well, and the implementation of the present invention is not affected, at this time, the time when the voltage of the non-inverting input terminal of the comparator a1 is increased to be greater than, The capacitance of the first capacitor C1 and the voltage of the reference voltage VREF are adjusted and controlled, and the start time of the over-current protection of the level shifter chip 100 is controllable.
Based on the same invention concept, the invention also provides a liquid crystal display device which comprises the level switching circuit and can effectively avoid the phenomenon that overcurrent protection is triggered by mistake due to the large current generated by the startup of the liquid crystal display device. The level shift circuit will not be described in detail herein.
In summary, the level shift circuit of the present invention includes a level shift chip and an overcurrent protection starting circuit, the overcurrent protection starting circuit includes an acquisition module, a comparator, a switching tube and a first voltage dividing unit, when the circuit works, the acquisition module acquires a constant voltage high potential to increase a voltage at a non-inverting input terminal of the comparator, when the voltage at the non-inverting input terminal of the comparator is greater than a reference voltage, the comparator outputs a high level to turn on the switching tube, a detecting terminal of the level shift chip is grounded through the first voltage dividing unit, so that the level shift chip starts overcurrent protection, the starting time of the level shift chip overcurrent protection can be delayed, and the overcurrent protection can be effectively prevented from being triggered by a large current generated by the start-up of the liquid crystal display device. The liquid crystal display device can effectively avoid the phenomenon that overcurrent protection is triggered by mistake due to large current generated by starting the liquid crystal display device.
As described above, it will be apparent to those skilled in the art that various other changes and modifications can be made based on the technical solution and the technical idea of the present invention, and all such changes and modifications should fall within the protective scope of the appended claims.
Claims (7)
1. A level shift circuit is characterized by comprising a level shift chip (100) and an overcurrent protection starting circuit (200) electrically connected with the level shift chip (100);
the overcurrent protection starting circuit (200) comprises an acquisition module (210), a comparator (A1), a switching tube (220) and a first voltage division unit (230);
the input end of the acquisition module (210) is connected with a constant voltage high potential (VGH), and the output end of the acquisition module is electrically connected with the non-inverting input end of the comparator (A1);
the inverting input end of the comparator (A1) is connected with a reference Voltage (VREF), and the output end of the comparator (A1) is electrically connected with the control end of the switch tube (220);
the first end of the switch tube (220) is grounded, and the second end of the switch tube is electrically connected with the first end of the first voltage division unit (230);
the second end of the first voltage division unit (230) is electrically connected with the detection end of the level conversion chip (100);
the level conversion chip (100) starts over-current protection when the detection end is grounded through the first voltage division unit (230);
the acquisition module (210) comprises a first acquisition unit (211) and a second acquisition unit (212);
the input end of the first acquisition unit (211) is connected with a constant voltage high potential (VGH), and the output end of the first acquisition unit is electrically connected with the input end of the second acquisition unit (212); the output end of the second acquisition unit (212) is electrically connected with the non-inverting input end of the comparator (A1);
the first acquisition unit (211) comprises a second resistor (R2) and a first capacitor (C1); a first end of the second resistor (R2) is connected to a constant voltage high potential (VGH), and a second end of the second resistor is electrically connected to an input end of the second acquisition unit (212); the first end and the second end of the first capacitor (C1) are respectively and electrically connected with the first end and the second end of the second resistor (R2).
2. The level shift circuit of claim 1, wherein the acquisition module (210) further comprises a third acquisition unit (213); the input end of the third acquisition unit (213) is electrically connected with the output end of the first acquisition unit (211), and the output end is grounded.
3. The circuit of claim 1, wherein the second sampling unit (212) comprises a fourth resistor (R4), a first terminal of the fourth resistor (R4) is electrically connected to the output terminal of the first sampling unit (211), and a second terminal of the fourth resistor is electrically connected to the control terminal of the switch (220).
4. The circuit of claim 2, wherein the third sampling unit (213) comprises a third resistor (R3) and a second capacitor (C2), a first end of the third resistor (R3) is electrically connected to the output end of the first sampling unit (211), and a second end is grounded; the first end and the second end of the second capacitor (C2) are respectively and electrically connected with the first end and the second end of the third resistor (R3).
5. The circuit of claim 1, wherein the switch transistor (220) is an N-type field effect transistor (Q1), the gate of the N-type field effect transistor (Q1) is the control terminal of the switch transistor (220), the source is the first terminal of the switch transistor (220), and the drain is the second terminal of the switch transistor (220).
6. The circuit of claim 1, wherein the first voltage divider unit (230) comprises a first resistor (R1), a first terminal of the first resistor (R1) is electrically connected to the second terminal of the switch (220), and a second terminal of the first resistor is electrically connected to the detecting terminal of the level shifter chip (100).
7. A liquid crystal display device comprising the level conversion circuit according to any one of claims 1 to 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710949422.7A CN107705763B (en) | 2017-10-12 | 2017-10-12 | Level conversion circuit and liquid crystal display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710949422.7A CN107705763B (en) | 2017-10-12 | 2017-10-12 | Level conversion circuit and liquid crystal display device |
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| CN107705763A CN107705763A (en) | 2018-02-16 |
| CN107705763B true CN107705763B (en) | 2020-04-28 |
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| CN108831361B (en) * | 2018-06-25 | 2021-06-25 | 南京熊猫电子制造有限公司 | LED backlight driving circuit |
| CN109036302B (en) * | 2018-07-20 | 2019-12-24 | 深圳市华星光电半导体显示技术有限公司 | Liquid crystal display device with a light guide plate |
| CN110085188B (en) * | 2019-05-05 | 2021-10-08 | 京东方科技集团股份有限公司 | Level conversion device of display panel, control method thereof and display panel |
| CN110995243A (en) * | 2019-11-19 | 2020-04-10 | Tcl华星光电技术有限公司 | Level conversion circuit and display panel |
| US11405038B2 (en) | 2019-11-19 | 2022-08-02 | Tcl China Star Optoelectronics Technology Co., Ltd. | Level shifter circuit and display panel |
| CN110969974A (en) * | 2019-11-25 | 2020-04-07 | Tcl华星光电技术有限公司 | Power management circuit and method |
| CN111445883B (en) * | 2020-05-09 | 2021-10-29 | 福州京东方光电科技有限公司 | Control circuit, driving method thereof and display device |
| CN112017579B (en) * | 2020-09-02 | 2021-11-02 | Tcl华星光电技术有限公司 | Display device and driving system thereof |
| CN112908277B (en) * | 2021-02-03 | 2022-11-15 | 重庆先进光电显示技术研究院 | Gate-on voltage output control circuit, gate-less driving device and display device |
| CN113035116B (en) | 2021-03-02 | 2022-04-01 | Tcl华星光电技术有限公司 | Drive circuit and display device |
| CN114336502B (en) * | 2021-12-13 | 2024-06-25 | 重庆惠科金渝光电科技有限公司 | Overcurrent protection control method and gateless driving chip |
| CN114220405B (en) * | 2021-12-15 | 2023-01-20 | 惠州视维新技术有限公司 | Level conversion circuit, power supply integrated circuit, display device, and level conversion method |
| CN114283734B (en) * | 2022-01-28 | 2024-02-27 | 绵阳惠科光电科技有限公司 | Data driving protection circuit, device, display panel and display |
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