CN210535320U - Level conversion circuit, level conversion chip and display device - Google Patents
Level conversion circuit, level conversion chip and display device Download PDFInfo
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- CN210535320U CN210535320U CN201922201109.2U CN201922201109U CN210535320U CN 210535320 U CN210535320 U CN 210535320U CN 201922201109 U CN201922201109 U CN 201922201109U CN 210535320 U CN210535320 U CN 210535320U
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Abstract
The embodiment of the utility model discloses a level shift circuit, a level shift chip and a display device, wherein the level shift circuit comprises a power failure detection module, a voltage control module and a first output module; the power failure detection module generates an enabling signal according to the power failure detection signal, the input end of the voltage control module receives backlight voltage, the voltage control module converts the backlight voltage into a first high level, the control end of the first output module is electrically connected with the output end of the power failure detection module, the first voltage input end of the first output module is electrically connected with the output end of the voltage control module, the second voltage input end of the first output module receives a low level, and the first output module outputs the first high level or the first low level at the output end of the first output module according to the enabling signal. The utility model provides a technical scheme has realized when display panel shuts down, can release remaining electric charge fast, and can not increase output voltage's ripple, is favorable to solving the problem of restarting the splash screen.
Description
Technical Field
The utility model relates to a show technical field, especially relate to a level shift circuit, level shift chip and display device.
Background
With the development of display technology, display devices are developing towards high quality display and low power consumption, and have great significance in the display field.
In the prior art, after the display device is in a dormant state or restarted, the display panel is easy to generate a phenomenon of screen flashing, which affects the display quality of the display panel. The reason for this problem is that, after the display device is turned off, residual charges still exist in the display device, which affect the display of the display panel, and a phenomenon of screen flashing occurs.
The prior art generally has two solutions, one is that after the display device is shut down, the low level VGL is pulled up to the high level VGH, however, since the high level VGH after the display device is shut down is also powered down, the pulling up effect on the low level is not good, and the release speed of the residual charge is influenced; the other is to improve the problem of the flash screen by removing the voltage stabilizing capacitor, but the removal of the voltage stabilizing capacitor results in an increase of the output ripple of the low-level VGL.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a level shift circuit, level shift chip and display device to when realizing that display panel shuts down, can release residual charge fast, and can not increase output voltage's ripple.
In a first aspect, an embodiment of the present invention provides a level shift circuit, the level shift circuit is disposed in a display device, the display device further includes a gate driving circuit, the level shift circuit includes: the power failure detection module, the voltage control module and the first output module;
the power failure detection module comprises an input end and an output end, the input end of the power failure detection module receives a power failure detection signal, and the power failure detection module generates an enabling signal according to the power failure detection signal and outputs the enabling signal through the output end of the power failure detection module;
the voltage control module comprises an input end and an output end, the input end of the voltage control module receives backlight voltage, and the voltage control module converts the backlight voltage into a first high level and outputs the first high level through the output end of the voltage control module;
the first output module comprises a control end, a first voltage input end, a second voltage input end and an output end, the control end of the first output module is electrically connected with the output end of the power failure detection module, the first voltage input end of the first output module is electrically connected with the output end of the voltage control module, the second voltage input end of the first output module receives a low level, and the output end of the first output module is electrically connected with the grid drive circuit; the first output module outputs the first high level or the low level at an output end thereof according to the enable signal.
Preferably, the voltage control module is a voltage boosting circuit or a voltage reducing circuit.
Preferably, the voltage control module further comprises a control terminal;
the level conversion circuit further comprises a communication module and a timer;
the communication module comprises a power supply end, an input end and an output end, the power supply end of the communication module is electrically connected with the input end of the voltage control module, and the input end of the communication module receives communication signals;
the timer comprises an input end and an output end, the input end of the timer is electrically connected with the output end of the communication module, and the output end of the timer is electrically connected with the control end of the voltage control module.
Preferably, the first output module comprises a first comparator;
the comparison voltage input end of the first comparator is electrically connected with the output end of the power failure detection module, the first power supply input end of the first comparator receives the first high level, the second power supply input end of the first comparator receives the low level, and the output end of the first comparator is electrically connected with the grid driving circuit.
Preferably, the level shift circuit further comprises a charge draining module, the charge draining module comprising: a transistor and a resistor;
the grid electrode of the transistor is electrically connected with the output end of the power failure detection module, and the first electrode of the transistor receives a power supply signal;
the first end of the resistor is electrically connected with the second pole of the transistor, and the second end of the resistor is grounded.
Preferably, the level shift circuit further comprises a second output module;
the second output module comprises a first control end, a second control end, a first voltage input end, a second voltage input end and an output end, the first control end of the second output module receives a grid input signal, the second control end of the second output module is electrically connected with the output end of the power failure detection module, the first voltage input end of the second output module receives a second high level, the second voltage input end of the second output module receives the low level, and the output end of the second output module is electrically connected with the grid driving circuit.
Preferably, the second output module comprises a gate control module and a second comparator;
the grid control module comprises an input end and an output end, and the input end of the grid control module receives a grid input signal;
the reference voltage input end of the second comparator is electrically connected with the output end of the grid control module, the comparison voltage input end of the second comparator is electrically connected with the output end of the power failure detection module, the first power supply input end of the second comparator receives the second high level, the second power supply input end of the second comparator receives the low level, and the output end of the second comparator is electrically connected with the grid driving circuit.
Preferably, the first high level voltage output by the first output module is higher than the second high level voltage output by the second output module; or the first high-level thrust output by the first output module is greater than the second high-level thrust output by the second output module.
In a second aspect, the embodiment of the present invention further provides a level shift chip, where the level shift chip includes any one of the above level shift circuits.
In a third aspect, the embodiment of the present invention further provides a display device, which includes a display panel and a level conversion chip, a gate driving circuit is disposed on the display panel.
The embodiment of the utility model provides a through setting up the level conversion circuit in display device, pull high output to gate drive circuit's level when display device shuts down, solved the problem of dormancy, restart the splash screen. Specifically, the embodiment of the utility model provides a technical scheme, after the input voltage through falling electric detection module detection display device falls the electricity, convert backlight voltage into first high level by voltage control module, and export through first output module, because backlight voltage is continuous output after shutting down, consequently can ensure that voltage control module still can export first high level after shutting down, and first high level can not take place the phenomenon of electricity down, consequently, compare with prior art, the utility model provides a level conversion circuit makes the low level after shutting down raise to first high level fast, is favorable to realizing that TFT opens completely in the display panel, releases the electric charge, and owing to need not to remove steady voltage electric capacity for the ripple of the low level of first output module output can not increase. The realization is on the basis of guaranteeing that output voltage's ripple is less for display device raises the speed to first high level at the low level after the shutdown, is favorable to the quick release electric charge, thereby is favorable to avoiding display device at dormancy or restart the back, and the phenomenon of splash screen appears easily in display panel.
Drawings
Fig. 1 is a block diagram of a level shift circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of another level shift circuit according to an embodiment of the present invention;
fig. 3 is a block diagram of another level shift circuit according to an embodiment of the present invention;
fig. 4 is a block diagram of another level shift circuit according to an embodiment of the present invention;
fig. 5 is a block diagram of another level shift circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a block diagram of a level shift circuit provided in an embodiment of the present invention, the level shift circuit is disposed in a display device, the display device further includes a gate driving circuit 200, as shown in fig. 1, the level shift circuit 100 includes: the power failure detection module 10, the voltage control module 20 and the first output module 30;
the power failure detection module 10 comprises an input end a1 and an output end a2, the input end a1 of the power failure detection module 10 receives a power failure detection signal XON, the power failure detection module 10 generates an enable signal according to the power failure detection signal XON, and the enable signal is output through the output end a2 of the power failure detection module 10;
the voltage control module 20 includes an input terminal B1 and an output terminal B2, the input terminal B1 of the voltage control module 20 receives the backlight voltage VLED, and the voltage control module 20 converts the backlight voltage VLED into a first high level VGH1 and outputs the first high level VGH1 through the output terminal B2 of the voltage control module 20;
the first output module 30 includes a control terminal C1, a first voltage input terminal C2, a second voltage input terminal C3 and an output terminal C4, the control terminal C1 of the first output module 30 is electrically connected to the output terminal a2 of the power-down detection module 10, the first voltage input terminal C2 of the first output module 30 is electrically connected to the output terminal B2 of the voltage control module 20, the second voltage input terminal C3 of the first output module 30 receives a low-level VGL, and the output terminal C4 of the first output module 30 is electrically connected to the gate driving circuit 200; the first output module 30 outputs a first high level VGH1 or a low level VGL at its output terminal C4 according to the enable signal.
Specifically, the level shifter Circuit 100 is disposed on a PCBA (Printed Circuit Board + Assembly), and is electrically connected to the gate driving Circuit 200, and when the display device is turned off, the level shifter Circuit 100 pulls all the voltages output to the gate driving Circuit 200 to a high level, so as to accelerate the release of the residual charges and prevent the phenomenon of restarting the flash. The power failure detection module 10 determines whether the display device is in a shutdown state by receiving a power failure detection signal XON, where the power failure detection signal XON may be generated by a power supply, and the power failure detection module 10 receives the power failure detection signal XON and determines that the display device is in the shutdown state after detecting that the power failure detection signal XON is powered down. At this time, the power down detection module 10 generates an enable signal according to the power down detection signal XON and outputs the enable signal to the control terminal C1 of the first output module 30. Since the externally input backlight voltage VLED can be continuously supplied after the display device is turned off, the voltage control module 20 converts the backlight voltage VLED into the first high level VGH1, and outputs the first high level VGH1 to the first voltage input terminal C2 of the first output module 30; the second voltage input terminal C3 of the first output module 30 inputs the low level VGL. When the display device normally operates, the first output module 30 outputs a low level VGL from the output terminal C4 to the gate driving circuit 200; when the power failure detection module 10 determines that the display device is turned off according to the received power failure detection signal XON, the first output module 30 outputs the first high level VGH1 to the gate driving circuit 200 according to the enable signal, so that the voltage of the gate driving circuit 200 meets the requirement, thereby accelerating the release of the residual charge.
The embodiment of the utility model provides a through setting up level shift circuit 100 in display device, draw high output to gate drive circuit 200's low level VGL when display device shuts down for low level VGL raises the speed to first high level VGH1 to make TFT in the display panel open completely, the problem of dormancy, restart the splash screen has been solved to the quick release electric charge. The embodiment of the utility model provides a level shift circuit 100 falls the power back through the input voltage that falls electric detection module 10 and detect display device, convert backlight voltage VLED into first high level VGH1 by voltage control module 20, and export through first output module 30, because backlight voltage VLED last output after the shutdown, consequently can ensure that voltage control module 20 still can export first high level VGH1 after the shutdown, and first high level VGH1 can not take place the phenomenon of falling the power, consequently, compare with prior art, the embodiment of the utility model provides a level shift circuit can accelerate low level VGL after the shutdown and raise to the speed of first high level VGH1, is favorable to realizing that TFT opens completely in the display panel, releases electric charge. In addition, the embodiment of the present invention does not need to remove the voltage stabilizing capacitor (not shown in fig. 1), and the voltage stabilizing capacitor is electrically connected to the output C4 of the first output module 30 or the input end of the low-level VGL, so that the ripple of the first high-level VGH1 or the low-level VGL output by the first output module 30 is not increased. Therefore, the embodiment of the utility model provides a can be on the less basis of the ripple of ensureing low level VGL for low level VGL raises to the speed of first high level VGH1 to make the TFT in the display panel open completely, the quick release electric charge is favorable to avoiding display device in the dormancy or restart the back, and the phenomenon of splash screen appears easily in the display panel.
Further, on the basis of the above embodiment, with continued reference to fig. 1, the voltage control module 20 is a voltage boosting circuit or a voltage dropping circuit.
Specifically, the voltage control module 20 converts the backlight voltage VLED into a voltage required by the display device, and outputs the voltage to the gate driving circuit 200 through the first output module 30. The voltage control module 20 may be a voltage boosting circuit or a voltage dropping circuit according to the backlight voltage VLED. Illustratively, when the backlight voltage VLED is 8V, the voltage control module 20 is a boost circuit, and converts the backlight voltage VLED of 8V into a first high level VGH1 with a voltage of 15V, and the first output module 30 outputs the first high level VGH1 to the gate driving circuit according to the enable signal output by the power down detection module 10; when the backlight voltage VLED is 20V, the voltage control module 20 is a step-down circuit, and converts the 20V backlight voltage VLED into a first high level VGH1 with a voltage of 15V, and the first output module 30 outputs the first high level VGH1 to the gate driving circuit 200 according to the enable signal output by the power down detection module 10.
Further, fig. 2 is a block diagram of another level shift circuit according to an embodiment of the present invention, and as shown in fig. 2, the voltage control module 20 further includes a control terminal B3; the level shift circuit 100 further includes a communication module 40 and a timer 50; the communication module 40 comprises a power supply terminal D1, an input terminal D2 and an output terminal D3, the power supply terminal D1 of the communication module 40 is electrically connected with the input terminal B1 of the voltage control module 20, and the input terminal D2 of the communication module 40 receives a communication signal;
the timer 50 includes an input terminal E1 and an output terminal E2, the input terminal E1 of the timer 50 is electrically connected to the output terminal D3 of the communication module 40, and the output terminal E2 of the timer 50 is electrically connected to the control terminal B3 of the voltage control module 20.
Specifically, the communication module 40 may be an IIC bus, the input end D2 of the communication module 40 includes a clock bus interface, a data bus interface and a ground end, and the communication module 40 is configured to control the output time of the voltage control module 20 outputting the first high level VGH1 after shutdown. The microprocessor controls the operation of the communication module 40, sends a clock signal to a clock bus interface of the communication module 40 through a clock bus, and detects the level of the clock signal to determine the time for sending the clock signal again; the microprocessor sends data to the data bus interface of the communication module 40. The communication module 40 adjusts the timer 50 according to the received clock signal and data, the timer 50 sends a control signal to the voltage control module 20, and the voltage control module 20 converts the backlight voltage VLED into a first high level VGH1 according to the received control signal and outputs the first high level VGH1 through the first output module 30; when the timing time is up, the timer 50 sends a control signal to the voltage control module 20, and the voltage control module 20 stops converting the backlight voltage VLED to the first high level VGH1 according to the received control signal. Since the backlight voltage VLED is continuously output after the power-off, the voltage control module 20 can still output the first high level VGH1 after the power-off to accelerate the charge discharging, and when the charge discharging is completed, the first high level VGH1 is not needed to be output. The embodiment of the utility model provides a set up communication module 40 and timer 50, can be after the charge release is accomplished, control voltage control module 20 stop work to save the consumption.
Further, fig. 3 is a block diagram of another level shift circuit according to an embodiment of the present invention, as shown in fig. 3, the level shift circuit 100 further includes a charge draining module 60, and the charge draining module 60 includes: a transistor Q and a resistor R;
the gate of the transistor Q is electrically connected to the output terminal a2 of the power failure detection module 10, and the first pole of the transistor Q receives a power supply signal;
the first end of the resistor R is electrically connected with the second pole of the transistor Q, and the second end of the resistor R is grounded.
Specifically, the power signal is a voltage signal P-AVEE for charging a TFT in the display device, and when the voltage signal P-AVEE is not completely released and remains charges, a screen flashing phenomenon occurs when the display device is restarted. After the display device is turned off, the charge draining module 60 receives the enable signal output by the power failure detecting module 10, and turns on the transistor Q according to the enable signal, so that the charge generated by the voltage signal P-AVEE is released through the transistor Q and the resistor R, and during normal operation of the display device, the resistor R is not connected to a circuit, and the power consumption of the system is not additionally increased. Therefore, the embodiment of the utility model provides a on the basis that does not increase the system consumption, further accelerated display device's charge release, be favorable to avoiding the splash screen phenomenon.
Further, fig. 4 is a block diagram of another level shift circuit according to an embodiment of the present invention, and as shown in fig. 4, the level shift circuit 100 further includes a second output module 70; the second output module 70 includes a first control terminal F1, a second control terminal F2, a first voltage input terminal F3, a second voltage input terminal F4, and an output terminal F5, the first control terminal F1 of the second output module 70 receives the gate input signal GIA, the second control terminal F2 of the second output module 70 is electrically connected to the output terminal a2 of the power-down detection module 10, the first voltage input terminal F3 of the second output module 70 receives the second high level VGH, the second voltage input terminal F4 of the second output module 70 receives the low level VGL, and the output terminal F5 of the second output module 70 is electrically connected to the gate driving circuit 200.
Specifically, the second output module 70 converts the gate input signal GIA inputted from the front end into a voltage matched with the level shifter, and outputs the gate control signal required by the gate driving circuit 200 at the output terminal F5. When the display device is turned off, the second output module 70 pulls the gate driving voltage to the second high level VGH according to the enable signal output by the power failure detection module 10, which is beneficial to quickening the release of the residual charges.
Further, fig. 5 is a block diagram of another level shift circuit according to an embodiment of the present invention, and as shown in fig. 5, the second output module 70 includes a gate control module 701 and a second comparator CO 2;
the gate control module 701 comprises an input terminal H1 and an output terminal H2, and the input terminal H1 of the gate control module 701 receives the gate input signal GIA;
the reference voltage input terminal 11 of the second comparator CO2 is electrically connected to the output terminal H2 of the gate control module 701, the comparison voltage input terminal 22 of the second comparator CO2 is electrically connected to the output terminal a2 of the power down detection module 10, the first power input terminal 33 of the second comparator CO2 receives the second high level VGH, the second power input terminal 44 of the second comparator CO2 receives the low level VGL, and the output terminal 55 of the second comparator CO2 is electrically connected to the gate driving circuit 200.
Specifically, the gate control module 701 is configured to raise the gate input signal GIA input from the front end to a voltage required by the gate driving circuit 200, so that the gate driving circuit can operate normally. When the display device works normally, the gate control module 701 controls the second comparator CO2 to output a gate control signal; when the display device is turned off, the power down detection module 10 generates an enable signal according to the power down detection signal XON and outputs the enable signal to the second comparator CO2, so as to control the second comparator CO2 to output a high level VGH.
Further, with continued reference to fig. 5, the first output module 30 includes a first comparator CO 1; a comparison voltage input terminal 1 of the first comparator CO1 is electrically connected to an output terminal a2 of the power down detection module 10, a first power input terminal 3 of the first comparator CO1 receives a first high level VGH1, a second power input terminal 4 of the first comparator CO1 receives a low level VGL, and an output terminal 5 of the first comparator CO1 is electrically connected to the gate driving circuit 200.
Specifically, when the display device normally operates, the first comparator CO1 outputs a low level VGL. When the display device is turned off, the power down detection module 10 generates an enable signal according to the power down detection signal XON and outputs the enable signal to the comparison voltage input terminal 1 of the first comparator CO1, the first comparator CO1 pulls the low level VGL up to the first high level VGH1, and outputs the first high level VGH1 to the gate driving circuit 200.
Further, the voltage of the first high level VGH1 output by the first output module 30 is higher than the voltage of the second high level VGH output by the second output module 70; or the first high level VGH1 output by the first output module 30 has a thrust force greater than that of the second high level VGH output by the second output module 70 to enhance the charge discharging capability.
Specifically, referring to fig. 5, the specific operation principle of the level shift circuit 100 provided in this embodiment is as follows:
when the display device normally operates, the first output module 30 outputs a low level VGL, and the second output module 70 outputs a gate control signal.
When the display device is turned off, the power failure detection module 10 detects a power failure of the power failure detection signal XON, and generates an enable signal according to the power failure detection signal XON. The second output module 70 controls the second comparator CO2 to output a high level VGH according to the enable signal output by the power failure detection module 10. The power down detection module 10 generates an enable signal according to the power down detection signal XON and outputs the enable signal to the comparison voltage input terminal 1 of the first comparator CO1, and the first comparator CO1 pulls the low level VGL high to the first high level VGH1 and outputs the first high level VGH1 to the gate driving circuit 200. Because the backlight voltage VLED is continuously output after the shutdown, the voltage control module 20 can still output the first high level VGH1 after the shutdown, and the first high level VGH1 does not generate a power failure phenomenon, and when the display device is shutdown, the low level VGL can still be quickly raised to the first high level VGH 1. In addition, the communication module 40 is configured to control the voltage control module 20 to output the first high level VGH1 for the output time after the shutdown, and may control the voltage control module 20 to stop operating after the charge release is completed, so as to save power consumption.
The charge discharging module 60 controls the transistor Q to be turned on according to the enable signal output by the power failure detection module 10, so that the charge generated by the voltage signal P-AVEE is released through the transistor Q and the resistor R.
The embodiment of the utility model provides a through setting up level shift circuit 100 in display device, draw high output to gate drive circuit 200's low level VGL when display device shuts down for low level VGL raises the speed to first high level VGH1 to make TFT in the display panel open completely, the problem of dormancy, restart the splash screen has been solved to the quick release electric charge. The embodiment of the utility model provides a level shift circuit 100 falls the power back through the input voltage that falls electric detection module 10 and detect display device, is changed the backlight voltage VLED into first high level VGH1 by voltage control module 20, and exports through first output module 30, because backlight voltage VLED last output after the shutdown, consequently can ensure that voltage control module 20 still can export first high level VGH1 after the shutdown, and first high level VGH1 can not take place the phenomenon of falling the power, consequently, compare with prior art, the embodiment of the utility model provides a level shift circuit can be when display device shuts down for low level VGL raises the speed to first high level VGH 1. In addition, the embodiment of the present invention does not need to remove the voltage stabilizing capacitor, so that the ripple of the first high level VGH1 or the low level VGL output by the first output module 30 does not increase. Therefore, the embodiment of the utility model provides a can be on the less basis of the ripple of ensureing low level VGL for low level VGL raises to the speed of first high level VGH1 to make the TFT in the display panel open completely, the quick release electric charge is favorable to avoiding display device in the dormancy or restart the back, and the phenomenon of splash screen appears easily in the display panel.
The embodiment of the utility model provides a still provide a level shift chip, this level shift chip includes the level shift circuit that above-mentioned embodiment provided, consequently the embodiment of the utility model provides a level shift chip also possesses the beneficial effect that the above-mentioned embodiment described.
Fig. 6 is the embodiment of the utility model provides a display device's schematic structure diagram, as shown in fig. 6, the embodiment of the utility model provides a still provides a display device, this display device for example can liquid crystal display device, and this display device specifically can be computer, panel computer, cell-phone, intelligent wearing equipment or information inquiry machine etc.. The display device comprises a display panel and the level conversion chip provided by the embodiment, wherein the level conversion chip is exemplarily arranged on the PCBA, and the gate driving circuit is arranged on the display panel. Therefore, the display device provided by the embodiment of the present invention also has the beneficial effects described in the above embodiments.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A level shift circuit, the level shift circuit is disposed in a display device, the display device further includes a gate driving circuit, the level shift circuit includes: the power failure detection module, the voltage control module and the first output module;
the power failure detection module comprises an input end and an output end, the input end of the power failure detection module receives a power failure detection signal, and the power failure detection module generates an enabling signal according to the power failure detection signal and outputs the enabling signal through the output end of the power failure detection module;
the voltage control module comprises an input end and an output end, the input end of the voltage control module receives backlight voltage, and the voltage control module converts the backlight voltage into a first high level and outputs the first high level through the output end of the voltage control module;
the first output module comprises a control end, a first voltage input end, a second voltage input end and an output end, the control end of the first output module is electrically connected with the output end of the power failure detection module, the first voltage input end of the first output module is electrically connected with the output end of the voltage control module, the second voltage input end of the first output module receives a low level, and the output end of the first output module is electrically connected with the grid drive circuit; the first output module outputs the first high level or the low level at an output end thereof according to the enable signal.
2. The level shift circuit of claim 1, wherein the voltage control module is a boost circuit or a buck circuit.
3. The circuit of claim 1, wherein the voltage control module further comprises a control terminal;
the level conversion circuit further comprises a communication module and a timer;
the communication module comprises a power supply end, an input end and an output end, the power supply end of the communication module is electrically connected with the input end of the voltage control module, and the input end of the communication module receives communication signals;
the timer comprises an input end and an output end, the input end of the timer is electrically connected with the output end of the communication module, and the output end of the timer is electrically connected with the control end of the voltage control module.
4. The circuit of claim 1, wherein the first output module comprises a first comparator;
the comparison voltage input end of the first comparator is electrically connected with the output end of the power failure detection module, the first power supply input end of the first comparator receives the first high level, the second power supply input end of the first comparator receives the low level, and the output end of the first comparator is electrically connected with the grid driving circuit.
5. The level shift circuit of claim 1, further comprising a charge bleed-off module, the charge bleed-off module comprising: a transistor and a resistor;
the grid electrode of the transistor is electrically connected with the output end of the power failure detection module, and the first electrode of the transistor receives a power supply signal;
the first end of the resistor is electrically connected with the second pole of the transistor, and the second end of the resistor is grounded.
6. The level shift circuit of claim 1, further comprising a second output module;
the second output module comprises a first control end, a second control end, a first voltage input end, a second voltage input end and an output end, the first control end of the second output module receives a grid input signal, the second control end of the second output module is electrically connected with the output end of the power failure detection module, the first voltage input end of the second output module receives a second high level, the second voltage input end of the second output module receives the low level, and the output end of the second output module is electrically connected with the grid driving circuit.
7. The circuit of claim 6, wherein the second output module comprises a gate control module and a second comparator;
the grid control module comprises an input end and an output end, and the input end of the grid control module receives a grid input signal;
the reference voltage input end of the second comparator is electrically connected with the output end of the grid control module, the comparison voltage input end of the second comparator is electrically connected with the output end of the power failure detection module, the first power input end of the second comparator receives the second high level, the second power input end of the second comparator receives the low level, and the output end of the second comparator is electrically connected with the grid driving circuit.
8. The circuit according to claim 6, wherein the first high level voltage outputted by the first output module is higher than the second high level voltage outputted by the second output module; or the first high-level thrust output by the first output module is greater than the second high-level thrust output by the second output module.
9. A level conversion chip comprising the level conversion circuit according to any one of claims 1 to 8.
10. A display device, comprising: a display panel and the level shift chip as claimed in claim 9, wherein the gate driving circuit is disposed on the display panel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922201109.2U CN210535320U (en) | 2019-12-10 | 2019-12-10 | Level conversion circuit, level conversion chip and display device |
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| CN201922201109.2U CN210535320U (en) | 2019-12-10 | 2019-12-10 | Level conversion circuit, level conversion chip and display device |
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| CN210535320U true CN210535320U (en) | 2020-05-15 |
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| CN201922201109.2U Active CN210535320U (en) | 2019-12-10 | 2019-12-10 | Level conversion circuit, level conversion chip and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113205783A (en) * | 2021-04-25 | 2021-08-03 | 成都中电熊猫显示科技有限公司 | Control apparatus for display device and control method for level conversion module |
| CN114242015A (en) * | 2021-12-17 | 2022-03-25 | 惠州视维新技术有限公司 | Control method of display panel circuit and display panel circuit |
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2019
- 2019-12-10 CN CN201922201109.2U patent/CN210535320U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113205783A (en) * | 2021-04-25 | 2021-08-03 | 成都中电熊猫显示科技有限公司 | Control apparatus for display device and control method for level conversion module |
| CN114242015A (en) * | 2021-12-17 | 2022-03-25 | 惠州视维新技术有限公司 | Control method of display panel circuit and display panel circuit |
| CN114242015B (en) * | 2021-12-17 | 2023-01-20 | 惠州视维新技术有限公司 | Control method of display panel circuit and display panel circuit |
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