CN110599977A - Shutdown ghost eliminating circuit and display device - Google Patents
Shutdown ghost eliminating circuit and display device Download PDFInfo
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- CN110599977A CN110599977A CN201910883356.7A CN201910883356A CN110599977A CN 110599977 A CN110599977 A CN 110599977A CN 201910883356 A CN201910883356 A CN 201910883356A CN 110599977 A CN110599977 A CN 110599977A
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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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention provides a shutdown ghost eliminating circuit and a display device, belongs to the technical field of display, and can solve the problem that the existing display device has shutdown ghost in a low-temperature environment. The shutdown ghost elimination circuit of the invention comprises: the device comprises a comparison module, a power management module, a power module and a level conversion module; the comparison module is used for comparing the voltage of the signal output by the gate drive circuit at the moment of shutdown with the reference voltage and outputting a feedback signal to the power management module; the power supply management module is used for outputting a first control instruction to the power supply module according to the feedback signal output by the comparison module; the power supply module is used for adjusting the voltage of the working level of the grid driving circuit during starting according to the first control instruction and outputting a working level signal to the level conversion module; the level conversion module is used for outputting a grid opening signal to the grid driving circuit according to the working level signal output by the power supply module.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a shutdown ghost eliminating circuit and a display device.
Background
In a Liquid Crystal Display (LCD) product, due to the influence of parasitic capacitance and storage capacitance, a part of charges may be stored on a pixel electrode, and if the stored charges are not effectively released, a part of images may remain at the moment of shutdown of the LCD product, that is, a shutdown afterimage phenomenon may occur.
At present, a level shifter having a charge discharging function is generally used, and at the moment of shutdown, all Thin Film Transistors (TFTs) connected to a gate line are turned on to discharge stored charges. By using the existing method, shutdown ghost shadow can be eliminated by controlling voltage, discharge time and the like at normal temperature of 25 ℃ (DEG C). However, in a low temperature environment, for example, at-5 ℃, due to the deterioration of the TFT characteristics in the LCD product, the voltage during shutdown is reduced, so that the discharge time is too short, and at the moment of shutdown, all the stored charges cannot be released, and the shutdown ghost phenomenon is still easily generated.
Disclosure of Invention
The present invention is directed to at least one of the problems of the prior art, and provides a shutdown ghost eliminating circuit and a display device.
The technical scheme adopted for solving the technical problem of the invention is a shutdown ghost eliminating circuit, which comprises: the device comprises a comparison module, a power management module, a power module and a level conversion module;
the comparison module is used for comparing the voltage of the signal output by the gate drive circuit at the moment of shutdown with the reference voltage and outputting a feedback signal to the power management module;
the power supply management module is used for outputting a first control instruction to the power supply module according to the feedback signal output by the comparison module;
the power supply module is used for adjusting the voltage of the working level of the grid drive circuit during starting up according to the first control instruction and outputting a working level signal to the level conversion module;
the level conversion module is used for outputting a grid opening signal to the grid driving circuit according to the working level signal output by the power supply module.
Optionally, the power management module is further configured to output a second control instruction to the power module according to a voltage of the output signal of the gate driving circuit and a voltage of the working level of the gate driving circuit;
and the power supply module is also used for adjusting the voltage of the working level of the grid drive circuit during starting up according to the second control instruction and outputting a working level signal to the level conversion module.
Optionally, the comparison module comprises: a comparator;
the positive input end of the comparator is connected with the output end of the grid drive circuit, the negative input end of the comparator is connected with the reference voltage end of the power management module, and the output end of the comparator is connected with the feedback end of the power management module.
Optionally, the power management module includes: a power management chip;
the receiving end of the power management chip is connected with the output end of the grid driving circuit, the feedback end is connected with the output end of the comparator, the reference voltage end is connected with the reverse input end of the comparator, and the control end and the output end are connected with the power module.
Optionally, the power module comprises: a charge pump and a voltage dividing resistor;
the charge pump is connected with the control end and the output end of the power management chip;
one end of the divider resistor is connected with the output end of the power management chip and the charge pump, and the other end of the divider resistor is connected with the level conversion module.
Optionally, the charge pump comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first diode, a second diode, a third diode, a fourth diode and a triode;
one end of the first capacitor is connected with the first power end through the first resistor and the second resistor which are connected in parallel, and the other end of the first capacitor is connected with the output end of the power management chip and one end of the divider resistor through a first diode;
one end of the second capacitor is connected with the first power end through the third resistor and the fourth resistor which are connected in parallel, and the other end of the second capacitor is connected with the output end of the power management chip and one end of the divider resistor through a first diode, a second diode and a third diode which are connected in series;
one end of the third capacitor is connected with one end of the sixth resistor and the first pole of the triode, and is connected with the second power supply end through the fifth resistor, and the other end of the third capacitor is connected with the common pole;
the first pole of the triode is connected with one end of the sixth resistor and one end of the third capacitor, the second pole of the triode is connected with one end of the fourth capacitor, the output end of the power management chip and one end of the divider resistor are connected through the first diode, the second diode, the third diode and the fourth diode which are connected in series, and the control pole of the triode is connected with the control end of the power control chip and the other end of the sixth resistor;
one end of the fourth capacitor is connected with the negative electrode of the triode, and the other end of the fourth capacitor is connected with the common electrode;
one end of the fifth capacitor is connected with the anode of the second diode and the cathode of the third diode, and the other end of the fifth capacitor is connected with the common electrode.
Optionally, the power module further comprises: a filter;
the filter comprises a plurality of storage capacitors connected in parallel, one end of each storage capacitor connected in parallel is connected with the negative electrode of the first diode and one end of the divider resistor, and the other end of each storage capacitor is connected with the common electrode.
Optionally, the level conversion module includes: a level shifter;
the first input end of the level shifter is connected with the sequential control module, the second input end of the level shifter is connected with the other end of the divider resistor, the third input end of the level shifter is connected with the working level input end, and the output end of the level shifter is connected with the input end of the grid drive circuit.
Optionally, the comparator is integrated in the power management chip.
The technical scheme adopted for solving the technical problem of the invention is a display device which comprises the shutdown ghost eliminating circuit.
Drawings
FIG. 1 is a waveform diagram illustrating voltage variation of an output signal of a gate driving circuit at the moment of shutdown in the prior art;
fig. 2 is a schematic structural diagram of a shutdown ghost eliminating circuit according to an embodiment of the present invention.
Wherein the reference numerals are:
201-comparison module, 202-power management module, 203-power module, 204-level conversion module, 2011-comparator, 2021-power management chip, 2031-charge pump, 2032-filter, 2041-level converter, R-divider resistor, R1-first resistor, R2-second resistor, R3-third resistor, R4-fourth resistor, R5-fifth resistor, R6-sixth resistor, C1-first capacitor, C2-second capacitor, C3-third capacitor, C4-fourth capacitor, C5-fifth capacitor, D1-first diode, D2-second diode, D3-third diode, D4-fourth diode, T-triode, and C-storage capacitor.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
At present, an array substrate line drive (GOA) circuit is generally used in a display device to implement line-by-line scanning of each line of gate lines in the array substrate, and data voltages are input to each pixel unit through corresponding data lines to implement normal display of the display device. In the display process, due to the existence of the storage capacitor and the parasitic capacitor, partial charges are stored on the pixel electrode. At the moment of shutdown, due to the influence of the stored charges, a shutdown ghost phenomenon can occur. In order to eliminate the shutdown ghost, gate turn-on signals are generally input to all the switching transistors at the same time, so that all the switching transistors are turned on, and the stored charges are completely released, thereby eliminating the shutdown ghost. It should be noted that, in the following description,
in the GOA circuit, the switch transistor is generally an N-type transistor, and its operating level signal is a high level signal VGH, which can be turned on when the high level signal VGH is input,
thereby inputting a GOA signal, which may be a clock signal CLK, a frame synchronization signal STV, etc. Fig. 1 is a waveform diagram of voltage variation of an output signal of a gate driving circuit at the moment of shutdown in the prior art, as shown in fig. 1, when a display device is normally operated at a normal temperature of 25 ℃, a voltage of a GOA circuit output signal Gout is substantially equal to a voltage of a high level signal VGH, the voltage of the GOA circuit output signal Gout at the moment of shutdown is smaller than the voltage of the high level signal VGH, meanwhile, gate turn-on signals are input to all switching transistors in the GOA circuit, all the switching transistors are turned on, and stored charges can be completely released by reasonably controlling the voltage and the discharge time of the high level voltage signal VGH. For example, in practical applications, the voltage of the high level signal VGH for normal operation of the display device is 27 volts (V), and the voltage of the output signal Gout of the GOA circuit at the moment of shutdown is 16V, so that shutdown ghost can be eliminated. However, in a low temperature environment, for example, -5 ℃, the voltage of the output signal Gout of the GOA circuit may drop to about 13V at the moment of shutdown due to the deteriorated characteristics of the switching transistor. At this time, the performance of the switching transistor is affected, wherein a part of the switching transistor cannot be turned on or cannot be turned on completely, so that the discharge time is relatively short, the stored charges cannot be completely released, and a shutdown afterimage phenomenon occurs. In order to solve the problem that a display device is prone to have shutdown afterimages in a low-temperature environment, the embodiment of the invention provides a shutdown afterimage elimination circuit and a display device.
The following will take the gate driving circuit in the display device as the GOA circuit, the switching transistor in the GOA circuit as the N-type transistor, and the operating level signal thereof as the high level signal VGH as an example, and further describe in detail the shutdown ghost eliminating circuit and the display device provided in the embodiments of the present invention with reference to the drawings and the detailed description.
Example one
Fig. 2 is a schematic structural diagram of a shutdown ghost eliminating circuit according to an embodiment of the present invention, and as shown in fig. 2, the shutdown ghost eliminating circuit includes: a comparison module 201, a power management module 202, a power module 203 and a level conversion module 204.
The comparing module 201 may compare the voltage of the output signal Gout of the GOA circuit at the moment of shutdown with the reference voltage, and output a feedback signal to the power management module 202. The power management module 202 may output a first control instruction to the power module 203 according to the feedback signal output by the comparison module 201. The power module 203 may adjust a voltage of the high level signal VGH of the GOA circuit operation during the power-on according to the first control instruction, and output the high level signal VGH to the level shift module 204. The level shift module 204 may output a gate turn-on signal to the GOA circuit according to the high level signal VGH output by the power module.
In the shutdown ghost eliminating circuit provided in the embodiment of the present invention, at the moment of shutdown, the comparing module 201 may compare the voltage of the output signal Gout of the GOA circuit with a preset reference voltage, and output a feedback signal including a comparison result to the power management module 202. If the voltage of the output signal Gout of the GOA circuit is higher than or equal to the preset reference voltage, "0" is output, and the power management module 202 may determine that the display device is at normal temperature according to the feedback result, and the power management module 202 does not react. If the voltage of the output signal Gout of the GOA circuit is less than the preset reference voltage, "1" is output, the power management module 202 may determine that the display device is in a low temperature environment according to the feedback result, and the power management module 202 may output a first control instruction, which may be a boosting control instruction, to the power module 203. In the embodiment of the present invention, the preset reference voltage may be set to 16V. After receiving the boosting control command, the power module 203 may boost the voltage of the initial high level signal VGH at the next power-on, for example, the voltage of the high level signal VGH may be raised from 27V to 32V, so that the voltage of the output signal Gout of the GOA circuit in a low temperature environment may satisfy the condition that all the switching transistors are completely turned on. The level conversion module 204 can output a gate turn-on signal to the GOA circuit according to the raised high level signal VGH, so that all the switch transistors in the GOA circuit are completely turned on, and the gate turn-on signal is maintained for a long enough time to completely release charges, thereby eliminating shutdown ghost of the display device in a low temperature environment, and further improving the display effect.
Optionally, the power management module 202 may further output a second control instruction to the power module 203 according to the gate driving output voltage and the voltage of the gate driving circuit working level. The power module 203 may further adjust a voltage of a working level of the gate driving circuit during power on according to the second control instruction, and output a working level signal to the level conversion module 104.
In the shutdown ghost elimination circuit provided by the embodiment of the invention, when the display panel works in a stable environment, the voltage of the output signal Gout of the GOA circuit and the voltage of the high-level signal VGH are basically maintained to be stable. For example, at normal temperature, the voltage of the output signal Gout of the GOA circuit is 16V, and the voltage of the corresponding high-level signal VGH is 27V; in a low temperature environment, the voltage of the output signal Gout of the GOA circuit is 13V, and the voltage of the corresponding high level signal VGH is 32V. When the display device returns to the normal temperature environment or the high temperature environment from the low temperature environment, the performance of the switching transistor in the GOA circuit is restored to the normal state due to the temperature increase, and the voltage of the output signal Gout of the GOA circuit can be automatically increased from 13V to 16V, however, the voltage of the high level signal VGH output by the power module 203 is not increased. Therefore, the power management module 202 can determine that the display device has returned from the low temperature environment to the normal temperature environment or the high temperature environment according to the relationship between the voltage of the output signal Gout of the GOA circuit and the voltage of the high level signal VGH. The power management module 202 may output a second control instruction, which may be a decrease control instruction, to the power module 203. After the power module 203 can receive the reduction control instruction, when the display panel is started next time, the voltage of the high level signal VGH is reduced, and the voltage of the initial high level signal VGH is recovered, so that the display panel can return to the normal temperature environment from the low temperature environment, the voltage of the high level signal VGH is reduced, for example, the voltage of the high level signal VGH can be reduced from 32V and recovered to 27V, when the shutdown ghost is eliminated, the energy consumption can be saved, and the operation cost is reduced.
Optionally, as shown in fig. 2, the comparing module 201 may include: a comparator 2011. The positive input terminal of the comparator 2011 is connected to the output terminal Gout of the gate driving circuit, the negative input terminal is connected to the reference voltage terminal of the power management module 202, and the output terminal is connected to the feedback terminal of the power management module.
It should be noted that the voltage of the output signal Gout of the GOA circuit may be input to the comparator 2011 through a positive input terminal, the reference voltage provided by the power management module 202 may be input to the comparator 2011 through a negative input terminal, and the comparator 2011 may compare the magnitudes of the two, and output the feedback result to the power management module 202 through an output terminal, so as to determine whether the display device is in a low temperature environment.
Optionally, as shown in fig. 2, the power management module 202 includes: the power management chip 2021. The receiving end of the power management chip 2021 is connected to the output end of the gate driving circuit, the feedback end is connected to the output end of the comparator 2011, the reference voltage end is connected to the inverting input end of the comparator 2011, and the control end and the output end are connected to the power module 203.
It should be noted that the power management chip 2021 may receive the feedback result output by the comparator 2011. When the feedback result is "0", the power management chip 2021 may determine that the display device is in a normal temperature environment, and the power management chip 2021 may not perform any reaction. When the feedback result is "1", the power management chip 2021 may determine that the display device is in a low temperature environment, and may output a first control instruction to the power module 203 through the control terminal, where the first control instruction may be a boosting control instruction, so that the power module 203 boosts the voltage of the initial high level signal VGH output by the power module 203. The input terminal of the power management chip 2021 may also be directly connected to the GOA circuit, and when detecting that the voltage of the GOA output signal Gout is automatically increased and the voltage of the high level signal VGH output by the power module 203 is not increased, the power management chip 2011 may determine that the display device returns to the normal temperature environment or the high temperature environment from the low temperature environment. A second control instruction may be output to the power module 203 through the control terminal, where the second control instruction may be a reduction control instruction, so that the power module 203 reduces the output unit of the high level signal VGH to restore to the voltage of the initial high level signal VGH.
Alternatively, as shown in fig. 2, the power supply module 203 may include: a charge pump 2031 and a voltage dividing resistor R. The charge pump 2031 is connected with the control end and the output end of the power management chip 2021; one end of the voltage dividing resistor R is connected to the output end of the power management chip 2021 and the charge pump 2031, and the other end is connected to the level conversion module 204.
It should be noted that the charge pump 2031 may raise or lower the voltage of the output high level signal VGH according to a control instruction received from the power management chip 2021, so that the voltage applied to the voltage-dividing resistor R may satisfy the turn-on conditions of all the switching transistors in the GOA circuit, thereby eliminating the shutdown afterimage of the display device in the normal temperature environment or the low temperature environment.
Specifically, as shown in fig. 2, the charge pump 2031 may include: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4 and a triode T.
One end of the first capacitor C1 is connected to the first power supply terminal through the first resistor R1 and the second resistor R2 which are connected in parallel, and the other end is connected to the output terminal of the power management chip and one end of the voltage dividing resistor through the first diode D1; one end of the second capacitor C2 is connected to the first power supply terminal through a third resistor R3 and a fourth resistor R4 which are connected in parallel, and the other end is connected to the output terminal of the power management chip and one end of the voltage dividing resistor through a first diode D1, a second diode D2 and a third diode D3 which are connected in series; one end of the third capacitor C3 is connected to one end of the sixth resistor R6 and the first pole of the triode T, and is connected to the second power supply terminal through the fifth resistor R5, and the other end is connected to the common pole; a first pole of the triode T is connected with one end of a sixth resistor R6 and one end of a third capacitor C3, a second pole of the triode T is connected with one end of a fourth capacitor C4, the output end of the power management chip and one end of a divider resistor are connected through a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4 which are connected in series, and a control pole of the triode T is connected with the control end of the power control chip and the other end of the sixth resistor R6; one end of the fourth capacitor C4 is connected with the negative electrode of the triode T, and the other end is connected with the common electrode; one end of the fifth capacitor C5 is connected to the anode of the second diode D2 and the cathode of the third diode D3, and the other end is connected to the common electrode.
It should be noted that the power management chip 2021 may input the raising control instruction or the lowering control instruction to the control electrode of the transistor T in the charge pump 2031, so as to change the amplification state of the transistor T, and further, may properly raise or lower the voltage of the high level signal VGH, so as to satisfy the turn-on conditions of all the switching transistors in the GOA circuit, thereby eliminating the shutdown ghost of the display device in the normal temperature environment or the low temperature environment.
Optionally, as shown in fig. 2, the power module 203 further includes: a filter 2032. The filter 2032 includes a plurality of storage capacitors C connected in parallel, one end of each of the storage capacitors C is connected to the negative electrode of the first diode D1 and one end of the voltage dividing resistor R, and the other end is connected to the common electrode.
It should be noted that the number of the storage capacitors C in the filter 2032 may be multiple, and the number of the storage capacitors C may be selected according to actual needs. In the embodiment of the present invention, the number of the storage capacitors C in the filter 2032 is 3, which can filter noise in the high level signal VGH generated by the charge pump 2031, improve the accuracy of the high level signal VGH, and avoid bad display and influence on the display effect due to unstable voltage.
Optionally, as shown in fig. 2, the level conversion module 204 includes: the level shifter 2041. The first input terminal of the level shifter 2041 is connected to the timing control module (not shown in the figure), the second input terminal is connected to the other end of the voltage dividing resistor R, the third input terminal is connected to the working level input terminal, and the output terminal is connected to the input terminal of the gate driving circuit.
It should be noted that the first input terminal of the level shifter 2041 may be connected to a timing control module, and the timing control module may provide a GOA signal with a preset timing, where the GOA signal may be a clock signal CLK or other signals. The second input terminal may be connected to the other end of the voltage dividing resistor R, and may receive the high level signal VGH generated by the charge pump 2031. The third input terminal may be connected to the operation level input terminal and may receive a low level signal VGH. The level shifter 2041 can amplify the GOA signal of the timing control module and input the amplified signal to a GOA circuit of the display device, where a high level signal VGH and a low level signal VGL can respectively control the on and off of a switch transistor in the GOA circuit, so that charges are completely released and shutdown afterimages in a low-temperature environment or a normal-temperature environment are eliminated.
Optionally, the comparator 2011 is integrated in the power management chip 2021.
It should be noted that the comparator 2011 may be integrated in the power management chip 2021, which may reduce the wiring in the circuit, thereby reducing the process difficulty and saving the manufacturing cost.
Example two
Based on the same inventive concept, an embodiment of the present invention provides a display device, which includes the shutdown ghost eliminating circuit provided in the above embodiment. The implementation principle of the shutdown ghost elimination circuit is similar to that of the shutdown ghost elimination circuit provided in the above embodiments, and is not described herein again.
The display device provided by the embodiment of the invention can realize the elimination of shutdown ghost shadow in a low-temperature environment by adjusting the voltage of the working level of the gate drive circuit, and meanwhile, the display device does not need to provide a working level signal with higher voltage for the gate drive circuit in a normal-temperature environment, thereby saving energy consumption.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A shutdown ghost elimination circuit, comprising: the device comprises a comparison module, a power management module, a power module and a level conversion module;
the comparison module is used for comparing the voltage of the signal output by the gate drive circuit at the moment of shutdown with the reference voltage and outputting a feedback signal to the power management module;
the power supply management module is used for outputting a first control instruction to the power supply module according to the feedback signal output by the comparison module;
the power supply module is used for adjusting the voltage of the working level of the grid drive circuit during starting up according to the first control instruction and outputting a working level signal to the level conversion module;
the level conversion module is used for outputting a grid opening signal to the grid driving circuit according to the working level signal output by the power supply module.
2. The shutdown ghost elimination circuit of claim 1,
the power supply management module is also used for outputting a second control instruction to the power supply module according to the voltage of the output signal of the grid drive circuit and the voltage of the working level of the grid drive circuit;
and the power supply module is also used for adjusting the voltage of the working level of the grid drive circuit during starting up according to the second control instruction and outputting a working level signal to the level conversion module.
3. The shutdown ghost elimination circuit of claim 1, wherein the comparison module comprises: a comparator;
the positive input end of the comparator is connected with the output end of the grid drive circuit, the negative input end of the comparator is connected with the reference voltage end of the power management module, and the output end of the comparator is connected with the feedback end of the power management module.
4. The shutdown ghost elimination circuit of claim 3, wherein the power management module comprises: a power management chip;
the receiving end of the power management chip is connected with the output end of the grid driving circuit, the feedback end is connected with the output end of the comparator, the reference voltage end is connected with the reverse input end of the comparator, and the control end and the output end are connected with the power module.
5. The shutdown ghost elimination circuit of claim 4, wherein the power module comprises: a charge pump and a voltage dividing resistor;
the charge pump is connected with the control end and the output end of the power management chip;
one end of the divider resistor is connected with the output end of the power management chip and the charge pump, and the other end of the divider resistor is connected with the level conversion module.
6. The shutdown ghost elimination circuit of claim 5, wherein the charge pump comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first diode, a second diode, a third diode, a fourth diode and a triode;
one end of the first capacitor is connected with the first power end through the first resistor and the second resistor which are connected in parallel, and the other end of the first capacitor is connected with the output end of the power management chip and one end of the divider resistor through a first diode;
one end of the second capacitor is connected with the first power end through the third resistor and the fourth resistor which are connected in parallel, and the other end of the second capacitor is connected with the output end of the power management chip and one end of the divider resistor through a first diode, a second diode and a third diode which are connected in series;
one end of the third capacitor is connected with one end of the sixth resistor and the first pole of the triode, and is connected with the second power supply end through the fifth resistor, and the other end of the third capacitor is connected with the common pole;
the first pole of the triode is connected with one end of the sixth resistor and one end of the third capacitor, the second pole of the triode is connected with one end of the fourth capacitor, the output end of the power management chip and one end of the divider resistor are connected through the first diode, the second diode, the third diode and the fourth diode which are connected in series, and the control pole of the triode is connected with the control end of the power control chip and the other end of the sixth resistor;
one end of the fourth capacitor is connected with the negative electrode of the triode, and the other end of the fourth capacitor is connected with the common electrode;
one end of the fifth capacitor is connected with the anode of the second diode and the cathode of the third diode, and the other end of the fifth capacitor is connected with the common electrode.
7. The shutdown ghost elimination circuit of claim 6, wherein the power module further comprises: a filter;
the filter comprises a plurality of storage capacitors connected in parallel, one end of each storage capacitor connected in parallel is connected with the negative electrode of the first diode and one end of the divider resistor, and the other end of each storage capacitor is connected with the common electrode.
8. The shutdown ghost elimination circuit of claim 7, wherein the level conversion module comprises: a level shifter;
the first input end of the level shifter is connected with the sequential control module, the second input end of the level shifter is connected with the other end of the divider resistor, the third input end of the level shifter is connected with the working level input end, and the output end of the level shifter is connected with the input end of the grid drive circuit.
9. The shutdown ghost elimination circuit of claim 4, wherein the comparator is integrated in the power management chip.
10. A display device comprising the shutdown ghost elimination circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910883356.7A CN110599977A (en) | 2019-09-18 | 2019-09-18 | Shutdown ghost eliminating circuit and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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