CN106297702B - Liquid crystal display device and its current foldback circuit - Google Patents
Liquid crystal display device and its current foldback circuit Download PDFInfo
- Publication number
- CN106297702B CN106297702B CN201610785080.5A CN201610785080A CN106297702B CN 106297702 B CN106297702 B CN 106297702B CN 201610785080 A CN201610785080 A CN 201610785080A CN 106297702 B CN106297702 B CN 106297702B
- Authority
- CN
- China
- Prior art keywords
- voltage difference
- voltage
- value
- module
- subtractor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 30
- 238000012790 confirmation Methods 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 230000001960 triggered effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
Landscapes
- 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)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a kind of current foldback circuits of liquid crystal display device; it includes level translator, GOA circuit, protection trigger module and multiple voltage comparison modules; the level translator output multi-channel clock signal is supplied to the GOA circuit; a voltage comparison module is connected between the two-way clock signal of arbitrary neighborhood, the output end of each voltage comparison module is connected to protection trigger module；Wherein, each voltage comparison module includes the first comparison module and the second comparison module, and the current value of the more adjacent two-way clock signal of the first comparison module exports first voltage difference；Reference voltage is exported second voltage difference by the second comparison module afterwards compared with the absolute value of first voltage difference；Protection trigger module judges the size of second voltage difference, if second voltage difference is greater than zero, protects trigger module to issue control signal to level translator, closes level translator.Invention additionally discloses the liquid crystal display devices comprising current foldback circuit as above.
Description
Technical Field
The invention relates to the technical field of display devices, in particular to a liquid crystal display device and an overcurrent protection circuit thereof.
Background
An Active Matrix Liquid Crystal Display (AMLCD) is currently the most commonly used Display device, and includes a plurality of pixels, each having a Thin Film Transistor (TFT) with a gate connected to a scan line extending in a horizontal direction, a drain connected to a data line extending in a vertical direction, and a source connected to a corresponding pixel electrode. If a positive voltage is applied to a scan line in the horizontal direction, all TFTs connected to the scan line are turned on, and a data signal voltage applied to a data line is written to a pixel electrode, thereby displaying a picture.
The Gate Driver On Array (GOA) technology is a technology for manufacturing a Gate scan driving circuit of a Thin Film Transistor (TFT) On an Array substrate to replace a driving chip manufactured by an external silicon chip, and is currently widely applied to a liquid crystal panel of an active matrix liquid crystal display. The GOA circuit can be directly manufactured around the panel, so that the frame thickness of the panel of the liquid crystal display can be reduced, the manufacturing process is simplified, the product cost is reduced, and the integration level of the liquid crystal panel is improved.
The gate voltage of each row of TFTs in the liquid crystal display may be supplied by a GOA circuit in which each row of TFTs is controlled to be turned on or off, typically using a Level Shifter (Level Shifter) to generate a clock signal. In the manufacturing process of the liquid crystal display, if the sealant of the liquid crystal display is not tightly sealed, which easily causes short circuit between the GOA circuits in the panel and generates a large Current signal, an Over Current Protection (OCP) circuit is started to close the level shifter, thereby preventing the liquid crystal display panel from being burned out.
Fig. 1 is a schematic structural diagram of a conventional GOA circuit with overcurrent protection, and as shown in fig. 1, a level shifter 1 provides multiple sets of clock signals to a GOA circuit 2, and the GOA circuit 2 generates scanning signals according to the clock signals and inputs the scanning signals into a liquid crystal panel. FIG. 2 shows voltage and current waveforms of the clock signal outputted from the level shifter 1, and FIG. 2 shows 4 sets of clock signals CK1～CK4Fig. 2 (a) is a voltage waveform diagram, and fig. 2 (b) is a current waveform diagram. As in fig. 2, when the clock signal CK1～CK4When the voltage of (2) is converted between high and low levels, the corresponding current ICK1～ICK4High-low value switching also occurs, and a large spike current is generated and finally gradually reduced to zero. As shown in fig. 1, the conventional protection circuit generally includes a current detection module 3 and a protection trigger module 4, where the current detection module 3 is configured to detect a current value of each group of clock signals, compare the detected current value with a reference value, and if the detected current value is greater than the reference value, send a control signal to the protection trigger module 4, and send a protection action by the protection trigger module 4 to turn off the level shifter 1, thereby achieving the purpose of protecting the liquid crystal display panel.
However, due to the clock signal CK1～CK4When the voltage is switched between high and low levels, the corresponding current signal can generate a large spike current, so that the reference current value in the protection circuit is difficult to set, and if the set reference current value is too small, false triggering can be caused, and the liquid crystal display stops working; if the set reference current value is too large, the protection operation may not be triggered when an abnormality occurs.
Disclosure of Invention
In view of the defects in the prior art, the invention provides an over-current protection circuit of a liquid crystal display device, so as to improve the accuracy of over-current protection of a GOA circuit in the liquid crystal display device.
In order to achieve the purpose, the invention adopts the following technical scheme:
an overcurrent protection circuit of a liquid crystal display device comprises a level shifter, a GOA circuit, a protection trigger module and a plurality of voltage comparison modules, wherein the level shifter outputs a plurality of clock signals to be provided for the GOA circuit; each voltage comparison module comprises a first comparison module and a second comparison module, wherein the first comparison module compares current values of the two adjacent paths of clock signals, outputs a first voltage difference value and sends the first voltage difference value to the second comparison module; the second comparison module is connected with a reference voltage, compares the absolute value of the reference voltage with the absolute value of the first voltage difference value, outputs a second voltage difference value and sends the second voltage difference value to the protection triggering module; and the protection triggering module judges the magnitude of the second voltage difference value, and if the second voltage difference value is greater than zero, the protection triggering module sends a control signal to the level shifter to close the level shifter.
Preferably, a voltage confirmation module is arranged between the first comparison module and the second comparison module, the voltage confirmation module confirms the magnitude of the first voltage difference, and if the first voltage difference is a positive value, the first voltage difference is directly input to the second comparison module; and if the first voltage difference value is a negative value, inverting the first voltage difference value into a positive value and inputting the positive value to the second comparison module.
Preferably, the first comparing module includes a first subtractor, a positive phase input end of the first subtractor is connected to a first clock signal of the two adjacent clock signals through a first current detecting unit, a negative phase input end of the first subtractor is connected to a second clock signal of the two adjacent clock signals through a second current detecting unit, and an output end of the first subtractor outputs the first voltage difference.
Preferably, the second comparing module includes a second subtractor, a positive input end of the second subtractor receives the absolute value of the first voltage difference, a negative input end of the second subtractor is connected to the reference voltage, and an output end of the second subtractor is connected to the protection triggering module.
Preferably, the second comparing module includes a second subtractor and a third subtractor, inverting input terminals of the second subtractor and the third subtractor are respectively connected to the reference voltage, and output terminals of the second subtractor and the third subtractor are respectively connected to the protection triggering module; if the first voltage difference value is a positive value, the voltage confirmation module inputs the first voltage difference value to a positive phase input end of the second subtractor; and if the first voltage difference value is a negative value, the voltage confirmation module inverts the first voltage difference value into a positive value and inputs the positive value to the positive input end of the third subtracter.
Preferably, the voltage confirmation module includes a detection unit, a switching element and an inverter, the detection unit detects a magnitude of the first voltage difference, and if the first voltage difference is a positive value, the switching element is controlled to directly input the first voltage difference to the second comparison module; and if the first voltage difference value is a negative value, controlling the switch element to connect the first voltage difference value to the inverter, and inverting the first voltage difference value into a positive value by the inverter and inputting the positive value to the second comparison module.
Preferably, the first comparing module includes a first subtractor, a positive phase input end of the first subtractor is connected to a first clock signal of the two adjacent clock signals through a first current detecting unit, and a negative phase input end of the first subtractor is connected to a second clock signal of the two adjacent clock signals through a second current detecting unit; the second comparison module comprises a second subtracter, wherein the positive phase input end of the second subtracter receives the absolute value of the first voltage difference, the negative phase input end of the second subtracter is connected with the reference voltage, and the output end of the second subtracter is connected with the protection triggering module.
Preferably, the first comparing module includes a first subtractor, a positive phase input end of the first subtractor is connected to a first clock signal of the two adjacent clock signals through a first current detecting unit, and a negative phase input end of the first subtractor is connected to a second clock signal of the two adjacent clock signals through a second current detecting unit; the second comparison module comprises a second subtracter and a third subtracter, wherein the reverse input ends of the second subtracter and the third subtracter are respectively connected with the reference voltage, and the output ends of the second subtracter and the third subtracter are respectively connected with the protection triggering module; if the first voltage difference value is a positive value, the voltage confirmation module inputs the first voltage difference value to a positive phase input end of the second subtractor; and if the first voltage difference value is a negative value, the voltage confirmation module inverts the first voltage difference value into a positive value and inputs the positive value to the positive input end of the third subtracter.
Preferably, the protection triggering module includes a determining unit and a control unit, where the determining unit determines the magnitude of the second voltage difference, and if the second voltage difference is greater than zero, the control unit sends a control signal to the level shifter to turn off the level shifter.
The invention also provides a liquid crystal display device which comprises a display panel and the overcurrent protection circuit, wherein at least the GOA circuit is formed on the display panel.
Has the advantages that: the overcurrent protection circuit of the liquid crystal display device provided by the embodiment of the invention acquires the voltage difference value of the two corresponding clock signals by detecting the current values of any two adjacent clock signals, and controls whether to trigger protection or not according to the comparison between the voltage difference value and the reference voltage value. Because the voltage difference value of the two paths of clock signals is relatively stable and the variation range of the two paths of clock signals is small, whether protection is triggered or not is controlled by comparing the voltage difference value with the reference voltage value, and the accuracy of overcurrent protection of the GOA circuit in the liquid crystal display device can be improved.
Drawings
Fig. 1 is a schematic structural diagram of a conventional GOA circuit with overcurrent protection;
FIG. 2 shows voltage and current waveforms of a clock signal output by a level shifter as in FIG. 1;
fig. 3 is a schematic structural diagram of an overcurrent protection circuit according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a voltage comparison module according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of a voltage comparison module according to an embodiment of the present invention;
FIG. 6 is a circuit diagram of a second comparison module provided in accordance with another preferred embodiment of the present invention;
fig. 7 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the invention shown in the drawings and described in accordance with the drawings are exemplary only, and the invention is not limited to these embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.
The embodiment provides an overcurrent protection circuit of a liquid crystal display device, and as shown in fig. 3, the overcurrent protection circuit comprises a level shifter 1 and a GOA power supplyWay 2, protection trigger module 3 and a plurality of voltage comparison module 5, level converter 1 outputs multichannel clock signal and provides GOA circuit 2, and a plurality of voltage comparison module 5 and protection trigger module 3 are connected between level converter 1 and GOA circuit 2 for whether detect level converter 1 output multichannel clock signal and take place unusually, if take place unusually, trigger protection control signal, in order to close level converter 1. The voltage comparison module 5 is connected between any two adjacent clock signals, and the output end of each voltage comparison module 5 is connected to the protection trigger module 3. In this embodiment, the level shifter 1 provides four clock signals CK to the GOA circuit 21～CK4Thus, four clock signals CK1～CK4Three voltage comparison modules 5 are connected. Of course, in other embodiments, the level shifter 1 may provide more clock signals, and accordingly, the voltage comparison module 5 may be increased.
To connect to the clock signal CK1And CK2The voltage comparison modules 5 therebetween are specifically described as an example, and the voltage comparison modules 5 connected between two adjacent clock signals all have the same structure. Specifically, as shown in fig. 4, each of the voltage comparison modules 5 includes a first comparison module 51 and a second comparison module 52, and the first comparison module 51 compares the two adjacent clock signals CK1And CK2Current value ofCK1And ICK2Outputting a first voltage difference V1To the second comparison module 52. The second comparing module 52 is connected to a reference voltage VFThe reference voltage V is setFIs different from the first voltage by a value V1Absolute value of | V1I comparing and outputting a second voltage difference value V2To the protection triggering module 3. The protection triggering module 3 judges the second voltage difference value V2If the second voltage difference value V is larger than the first voltage difference value2If the current value is greater than zero, the protection trigger module 3 sends a protection control signal to the level shifter 1, and the level shifter 1 is closed. If the second voltage difference value V2And if the current value is less than zero, the protection trigger module 3 sends a normal control signal to the level shifter 1 to keep the level shifter 1 working normally.
Wherein, the protection triggering module 3 includes a judging unit 31 and a control unit 32, the judging unit 31 judges the second voltage difference V2Is sent to the level shifter 1 by the control unit 32, a protection control signal or a normal control signal is sent to the level shifter 1.
Further, to ensure that the first voltage difference V is input to the second comparing module 521In this embodiment, as shown in fig. 4, a voltage confirmation module 53 is disposed between the first comparison module 51 and the second comparison module 52, and the voltage confirmation module 53 confirms the first voltage difference V1If the first voltage difference value V1If the voltage difference is positive, the first voltage difference value V is added1Directly to the second comparison module 52; if the first voltage difference value V1If the voltage difference is negative, the first voltage difference value V is set1The inverted signal is input to the second comparing module 52.
Specifically, as shown in fig. 5, in the present embodiment, the first comparing module 51 includes a first subtractor a1Said first subtracter A1The non-inverting input terminal of the first current detecting unit 511 is connected to the first clock signal CK of the two adjacent clock signals1Said first subtracter A1The inverting input terminal of the second current detecting unit 512 is connected to the second clock signal CK of the two adjacent clock signals2. Namely, a first subtractor A1The positive phase input end inputs a first clock signal CK1Current of (I)CK1A first subtracter A1The inverting input terminal inputs the second path of clock signal CK2Current of (I)CK2(ii) a The second current detecting unit 512 further outputs the second clock signal CK2Current of (I)CK2Phase shift is performed to make the phase shift and the first path clock signal CK1Current of (I)CK1With the same phase. A first subtracter A1Output terminal of the first voltage difference value V1。
Specifically, as shown in fig. 5, in the present embodiment, the voltage confirmation module 53 includes a detection unit 531, a switching element T, and an inverter B1The detecting unit 531 is connected to the first subtractor a1The switch element T is a knife double throw switch, and the fixed end of the switch element T is connected to the first subtractor a1To the output terminal of (a). The detecting unit 531 detects the first voltage difference value V1If the first voltage difference value V1If the voltage difference is positive, the switching element T is controlled to make the first voltage difference V1Directly to the second comparison module 52; if the first voltage difference value V1If the voltage difference is negative, the switching element T is controlled to make the first voltage difference V1Is connected to the inverter B1From said inverter B1Comparing the first voltage difference V1The inverted signal is input to the second comparing module 52.
Specifically, as shown in fig. 5, in the present embodiment, the second comparing module 52 includes a second subtractor a2Said second subtracter A2Receive the first voltage difference V at the positive input terminal1Absolute value of | V1I.e. the second subtractor a2Is connected to an output terminal of the knife double throw switch T and is also connected to the phase inverter B1An output terminal of (a); the second subtracter A2The inverting input end is connected with the reference voltage VFAnd the output end outputs the second voltage difference value V2Is connected to the protection triggering module. In another preferred embodiment, the circuit of the second comparing module 52 may also be such that, referring to fig. 6, the second comparing module 52 comprises a second subtractor a2And a third subtractor A3Said second subtracter A2And a third subtractor A3Are respectively connected with the reference voltage VFAnd the output end outputs the second voltage difference value V2Is connected to the protection triggering module. Wherein,if the first voltage difference value V1If the voltage difference is positive, the first voltage difference value V is added1Is input to the second subtractor A2I.e. the second subtractor a2Is connected to one output terminal of the single-pole double-throw switch T; if the first voltage difference value V1If the value is negative, the first voltage difference value V is set1Inverted to positive value | V1After | is input to the third subtracter A3I.e. the third subtractor a3Is connected to the inverter B1To the output terminal of (a).
In the over-current protection circuit provided in the above embodiment, if the first voltage difference V is smaller than the second voltage difference V1Is greater than the reference voltage VFIf the current difference between any two adjacent channels is larger than the set value, an abnormality should occur, and at this time, the second voltage difference value V is2If positive, triggering protection; if the first voltage difference V1Is less than the reference voltage VFIf the current difference between any two adjacent channels is smaller than the set value, the circuit is in a normal working state, and the second voltage difference value V is obtained at this time2And if the voltage is negative, the protection is not triggered, and the normal work of the circuit is kept. Because the voltage difference value of the two paths of clock signals is relatively stable and the variation range of the two paths of clock signals is small, whether protection is triggered or not is controlled by comparing the voltage difference value with the reference voltage value, and the accuracy of overcurrent protection of the GOA circuit in the liquid crystal display device can be improved. And, the detection point is located before the GOA circuit, if take place unusually, can trigger the protection more in time, avoids GOA circuit to be damaged.
The present embodiment further provides a liquid crystal display device, as shown in fig. 7, which includes a display panel 6 and the over-current protection circuit provided in the above embodiments, wherein at least the GOA circuit 2 is formed on the display panel 6. The level shifter 1 supplies clock signals to the GOA circuit 2, and the GOA circuit 2 generates scanning signals based on the clock signals and inputs the scanning signals to the liquid crystal panel 6.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.
Claims (10)
1. The overcurrent protection circuit of the liquid crystal display device is characterized by comprising a level shifter, a GOA circuit, a protection trigger module and a plurality of voltage comparison modules, wherein the level shifter outputs a plurality of clock signals to the GOA circuit;
each voltage comparison module comprises a first comparison module and a second comparison module, wherein the first comparison module compares current values of the two adjacent paths of clock signals, outputs a first voltage difference value and sends the first voltage difference value to the second comparison module; the second comparison module is connected with a reference voltage, compares the absolute value of the reference voltage with the absolute value of the first voltage difference value, outputs a second voltage difference value and sends the second voltage difference value to the protection triggering module;
and the protection triggering module judges the magnitude of the second voltage difference value, and if the second voltage difference value is greater than zero, the protection triggering module sends a control signal to the level shifter to close the level shifter.
2. The overcurrent protection circuit according to claim 1, wherein a voltage confirmation module is provided between the first comparison module and the second comparison module, the voltage confirmation module confirms the magnitude of the first voltage difference, and if the first voltage difference is a positive value, the first voltage difference is directly input to the second comparison module; and if the first voltage difference value is a negative value, inverting the first voltage difference value into a positive value and inputting the positive value to the second comparison module.
3. The overcurrent protection circuit of claim 2, wherein the first comparing module comprises a first subtractor, a positive phase input terminal of the first subtractor is connected to the first clock signal of the two adjacent clock signals through a first current detecting unit, a negative phase input terminal of the first subtractor is connected to the second clock signal of the two adjacent clock signals through a second current detecting unit, and an output terminal of the first subtractor outputs the first voltage difference.
4. The overcurrent protection circuit of claim 3, wherein the second comparison module comprises a second subtractor having a positive input terminal receiving the absolute value of the first voltage difference, a negative input terminal connected to the reference voltage, and an output terminal connected to the protection trigger module.
5. The overcurrent protection circuit of claim 3, wherein the second comparison module comprises a second subtractor and a third subtractor, and the second subtractor and the third subtractor have inverting input terminals respectively connected to the reference voltage and output terminals respectively connected to the protection trigger module; if the first voltage difference value is a positive value, the voltage confirmation module inputs the first voltage difference value to a positive phase input end of the second subtractor; and if the first voltage difference value is a negative value, the voltage confirmation module inverts the first voltage difference value into a positive value and inputs the positive value to the positive input end of the third subtracter.
6. The overcurrent protection circuit of claim 2, wherein the voltage confirmation module comprises a detection unit, a switching element and an inverter, the detection unit detects a magnitude of the first voltage difference, and if the first voltage difference is a positive value, the switching element is controlled to directly input the first voltage difference to the second comparison module; and if the first voltage difference value is a negative value, controlling the switch element to connect the first voltage difference value to the inverter, and inverting the first voltage difference value into a positive value by the inverter and inputting the positive value to the second comparison module.
7. The overcurrent protection circuit of claim 6, wherein the first comparing module comprises a first subtractor, a positive phase input terminal of the first subtractor is connected to the first clock signal of the two adjacent clock signals through a first current detecting unit, and a negative phase input terminal of the first subtractor is connected to the second clock signal of the two adjacent clock signals through a second current detecting unit;
the second comparison module comprises a second subtracter, wherein the positive phase input end of the second subtracter receives the absolute value of the first voltage difference, the negative phase input end of the second subtracter is connected with the reference voltage, and the output end of the second subtracter is connected with the protection triggering module.
8. The overcurrent protection circuit of claim 6, wherein the first comparing module comprises a first subtractor, a positive phase input terminal of the first subtractor is connected to the first clock signal of the two adjacent clock signals through a first current detecting unit, and a negative phase input terminal of the first subtractor is connected to the second clock signal of the two adjacent clock signals through a second current detecting unit;
the second comparison module comprises a second subtracter and a third subtracter, wherein the reverse input ends of the second subtracter and the third subtracter are respectively connected with the reference voltage, and the output ends of the second subtracter and the third subtracter are respectively connected with the protection triggering module; if the first voltage difference value is a positive value, the voltage confirmation module inputs the first voltage difference value to a positive phase input end of the second subtractor; and if the first voltage difference value is a negative value, the voltage confirmation module inverts the first voltage difference value into a positive value and inputs the positive value to the positive input end of the third subtracter.
9. The overcurrent protection circuit of any one of claims 1-8, wherein the protection trigger module comprises a determination unit and a control unit, the determination unit determines a magnitude of the second voltage difference, and if the second voltage difference is greater than zero, the control unit sends a control signal to the level shifter to turn off the level shifter.
10. A liquid crystal display device comprising a display panel and the overcurrent protection circuit as set forth in any one of claims 1 to 9, wherein at least the GOA circuit is formed on the display panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610785080.5A CN106297702B (en) | 2016-08-31 | 2016-08-31 | Liquid crystal display device and its current foldback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610785080.5A CN106297702B (en) | 2016-08-31 | 2016-08-31 | Liquid crystal display device and its current foldback circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106297702A CN106297702A (en) | 2017-01-04 |
| CN106297702B true CN106297702B (en) | 2018-11-23 |
Family
ID=57672717
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610785080.5A Active CN106297702B (en) | 2016-08-31 | 2016-08-31 | Liquid crystal display device and its current foldback circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106297702B (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107393491B (en) * | 2017-07-18 | 2018-08-14 | 深圳市华星光电半导体显示技术有限公司 | Clock signal output circuit and liquid crystal display device |
| CN107395006B (en) * | 2017-09-13 | 2020-07-03 | 深圳市华星光电技术有限公司 | Overcurrent protection circuit and liquid crystal display |
| US10311820B2 (en) | 2017-09-13 | 2019-06-04 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Over current protection circuit and liquid crystal display |
| KR102338945B1 (en) * | 2017-09-14 | 2021-12-13 | 엘지디스플레이 주식회사 | A display device having a level shifer |
| CN108154859B (en) * | 2018-01-16 | 2020-09-08 | 深圳市华星光电技术有限公司 | Array substrate and display device |
| CN108630164B (en) * | 2018-06-08 | 2019-12-06 | 深圳市华星光电半导体显示技术有限公司 | Display device |
| CN109064985B (en) * | 2018-08-27 | 2020-07-07 | 惠科股份有限公司 | Overcurrent protection circuit and display device |
| CN109346019B (en) * | 2018-11-22 | 2020-07-10 | 深圳市华星光电技术有限公司 | Overcurrent protection control circuit for level shift circuit |
| CN109449877B (en) * | 2018-12-03 | 2020-05-12 | 惠科股份有限公司 | Overcurrent protection method and display device |
| CN109637412B (en) * | 2018-12-25 | 2020-10-30 | 惠科股份有限公司 | Overcurrent protection method of display panel and display device |
| CN109584829B (en) * | 2018-12-25 | 2020-10-30 | 惠科股份有限公司 | Overcurrent protection method, display panel and overcurrent protection device |
| CN109523974A (en) * | 2018-12-26 | 2019-03-26 | 深圳市华星光电半导体显示技术有限公司 | Display device |
| CN110060644B (en) * | 2019-04-10 | 2021-01-01 | 深圳市华星光电技术有限公司 | Liquid crystal display device and overcurrent protection method thereof |
| CN110460016B (en) * | 2019-06-10 | 2022-07-08 | 惠科股份有限公司 | Overcurrent protection circuit, driving method of overcurrent protection circuit and display device |
| CN111312194B (en) | 2020-04-03 | 2021-06-22 | 苏州华星光电技术有限公司 | Protection system for GOA circuit and liquid crystal display panel |
| CN111627376B (en) * | 2020-06-17 | 2021-11-30 | 合肥鑫晟光电科技有限公司 | Overcurrent protection circuit, display device, driving circuit of display device and overcurrent protection method |
| CN114512079A (en) | 2020-11-16 | 2022-05-17 | 群创光电股份有限公司 | Electronic 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 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4425643B2 (en) * | 2003-02-10 | 2010-03-03 | シャープ株式会社 | Evaluation apparatus for liquid crystal display device, liquid crystal display device, and evaluation method for liquid crystal display device |
| CN103687240B (en) * | 2013-12-17 | 2016-03-30 | 深圳市华星光电技术有限公司 | Over-voltage over-current protection circuit and electronic installation |
| CN103944141A (en) * | 2014-04-02 | 2014-07-23 | 美的集团股份有限公司 | Air conditioner and compressor protection circuit thereof |
| CN104700811A (en) * | 2015-03-27 | 2015-06-10 | 友达光电股份有限公司 | Driving control circuit and over-current protection method of GOA circuit thereof |
| CN104732948B (en) * | 2015-04-17 | 2017-02-22 | 京东方科技集团股份有限公司 | Gate drive circuit, drive method of gate drive circuit, display panel and display device |
| CN105826894B (en) * | 2015-06-25 | 2018-06-26 | 维沃移动通信有限公司 | The charging short-circuit protection and power-supply device of power-supply device |
| CN205377729U (en) * | 2015-12-08 | 2016-07-06 | 深圳怡化电脑股份有限公司 | Circuit that restraines brushless DC motor peak current |
| CN105788560B (en) * | 2016-05-26 | 2019-01-22 | 深圳市华星光电技术有限公司 | DC voltage converting circuit and liquid crystal display device |
-
2016
- 2016-08-31 CN CN201610785080.5A patent/CN106297702B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106297702A (en) | 2017-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106297702B (en) | Liquid crystal display device and its current foldback circuit | |
| US10229619B2 (en) | Test circuit, test method, display panel and display apparatus | |
| US20180330684A1 (en) | Circuit and method for eliminating image sticking during power-on and power-off | |
| EP3285250B1 (en) | Drive chip, drive board and test method therefor, and display device | |
| US10116131B2 (en) | Over-current protection circuits and liquid crystal devices | |
| US9595215B2 (en) | Circuit for testing display panel, method for testing display panel, and display panel | |
| US20080309609A1 (en) | Liquid crystal display device with scanning voltage adjusting circuit and method for driving same | |
| US10025438B2 (en) | Device and method for detecting defects in self-capacitive touch panel | |
| US10839765B2 (en) | GOA detection circuit and testing method therefor | |
| WO2019051906A1 (en) | Overcurrent protection circuit and liquid crystal display | |
| JP2009026309A (en) | Reading circuit, display panel, and electronic system | |
| US10930214B2 (en) | Pixel circuit driving method, pixel circuit group and organic light emitting display device improving display aperture ratio and resolution | |
| US10629117B2 (en) | Detection circuit, pixel electrical signal collection circuit, display panel and display apparatus | |
| US10283028B2 (en) | Organic electroluminescent display panel, aging testing device and method, and display device | |
| CN203055406U (en) | Signal line detecting device and display device for substrate | |
| US9704448B2 (en) | Array substrate, display panel and repairing method thereof | |
| CN103412427A (en) | Liquid crystal display panel | |
| US10629154B2 (en) | Circuit for powering off a liquid crystal panel, peripheral drive device and liquid crystal panel | |
| CN106128351A (en) | A kind of display device | |
| US9230495B2 (en) | Self-detection charge sharing module | |
| CN110060644B (en) | Liquid crystal display device and overcurrent protection method thereof | |
| WO2018209742A1 (en) | Time sequence driving circuit for liquid crystal display panel, driving circuit and liquid crystal display panel | |
| TW202015028A (en) | Gate driver on array circuit, thin film transistor, and display device | |
| CN105813365A (en) | Static electricity protection circuit, display panel and display device | |
| US10643728B2 (en) | Display driving circuit, driving method thereof, and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |