CN114283734B - Data driving protection circuit, device, display panel and display - Google Patents
Data driving protection circuit, device, display panel and display Download PDFInfo
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- CN114283734B CN114283734B CN202210106705.6A CN202210106705A CN114283734B CN 114283734 B CN114283734 B CN 114283734B CN 202210106705 A CN202210106705 A CN 202210106705A CN 114283734 B CN114283734 B CN 114283734B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The application provides a data driving protection circuit, a device, a display panel and a display, wherein the data driving protection circuit reduces charging voltage output by an analog positive power supply to obtain pre-charging voltage when a source driving integrated circuit is charged through a voltage-reducing pre-charging circuit, and outputs the pre-charging voltage to the source driving integrated circuit to pre-charge the source driving integrated circuit; and when the precharge voltage meets a preset condition, outputting a driving signal to drive the switching element to be conducted. According to the method, the source electrode driving integrated circuit is precharged by the precharge voltage after the charge voltage is reduced, and the switch element is controlled to be conducted when the precharge voltage meets the preset condition, so that the analog positive power supply outputs the charge voltage to the source electrode driving integrated circuit, and the problem that the analog positive power supply outputs large voltage or large current when being started is avoided.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a data driving protection circuit, a device, a display panel, and a display.
Background
In the data driving circuit, the source driving integrated circuit can generate various gray scale voltages required by the panel, and further display various gray scale pictures. In the source driving integrated circuit, a voltage supplied from an analog positive power supply is a voltage required for generating various gray-scale images. The initial state of the source electrode driving integrated circuit does not have voltage or current, and when the analog positive power supply is started or shut down, large current or large voltage easily occurs between the analog positive power supply and the source electrode driving integrated circuit, so that an on-off picture is abnormal, and even a panel is damaged.
The foregoing is merely provided to facilitate an understanding of the principles of the present application and is not admitted to be prior art.
Disclosure of Invention
The main aim of the application is to provide a data driving protection circuit, a device, a display panel and a display, which solve the technical problem that large current or large voltage is easy to occur when the device is started.
In order to solve the above technical problem, the present application provides a data driving protection circuit, the data driving protection circuit is used for being connected with a simulation positive power supply, a source electrode driving circuit and a switching element arranged between the simulation positive power supply and the source electrode driving circuit, the data driving protection circuit includes: a driving circuit connected to a switching element between the analog positive power supply and the source driving integrated circuit, the data driving protection circuit further comprising: a step-down precharge circuit;
the step-down pre-charging circuit and the switching element are arranged in parallel between the analog positive power supply and the source electrode driving integrated circuit;
the step-down precharge circuit is used for reducing the charging voltage output by the analog positive power supply to obtain a precharge voltage when the source electrode driving integrated circuit is charged, and outputting the precharge voltage to the source electrode driving integrated circuit to precharge the source electrode driving integrated circuit;
the step-down precharge circuit is further configured to output the precharge voltage to the driving circuit;
and the driving circuit is used for outputting a driving signal to drive the switching element to be conducted when the precharge voltage meets a preset condition so that the analog positive power supply outputs the charge voltage to the source electrode driving integrated circuit.
Optionally, the data driving protection circuit includes: a voltage comparison circuit;
the voltage comparison circuit is respectively connected with the step-down pre-charging circuit and the switching element;
the voltage comparison circuit is used for comparing the pre-charge voltage with a pre-charge reference voltage, and outputting a driving signal to drive the switching element to be conducted when the pre-charge voltage is larger than the pre-charge reference voltage.
Optionally, the data driving protection circuit includes: a voltage comparison circuit;
the voltage comparison circuit is respectively connected with the step-down pre-charging circuit and the driving circuit;
the voltage comparison circuit is used for comparing the pre-charge voltage with a pre-charge reference voltage and outputting a starting signal to the driving circuit when the pre-charge voltage is larger than the pre-charge reference voltage;
the driving circuit is also used for outputting a driving signal to drive the switching element to be conducted when the starting signal is received.
Optionally, the driving circuit comprises a first MOS tube, a second MOS tube, a first resistor and a driving power supply;
the grid electrode of the first MOS tube and the grid electrode of the second MOS tube are connected with the output end of the voltage comparison circuit, the source electrode of the first MOS tube is connected with the control end of the switching element and the source electrode of the second MOS tube, the drain electrode of the second MOS tube is connected with the first end of the first resistor, the second end of the first resistor is connected with the driving power supply, and the drain electrode of the first MOS tube is grounded.
Optionally, the step-down precharge circuit includes: a third MOS tube with preset resistance value;
the grid electrode of the third MOS tube is connected with a driving power supply in the driving circuit, the drain electrode of the third MOS tube is respectively connected with the analog positive power supply and the input end of the switching element, and the source electrode of the third MOS tube is respectively connected with the input end of the source electrode driving integrated circuit, the voltage comparison circuit and the output end of the switching element.
Optionally, the voltage comparing circuit includes: a second resistor and a first comparator;
the first end of the second resistor is connected with the source electrode of the third MOS tube, the second end of the second resistor is connected with the forward input end of the first comparator, the reverse input end of the first comparator is connected with a reference power supply, and the output end of the first comparator is connected with the driving circuit.
Optionally, the data driving protection circuit further includes: an energy storage element;
the first end of the energy storage element is respectively connected with the drain electrode of the third MOS tube, the positive input end of the voltage comparison circuit and the input end of the source electrode driving integrated circuit, and the second end of the energy storage element is grounded.
In addition, in order to achieve the above object, the present application also provides a display panel including the data driving protection circuit.
In addition, in order to achieve the above object, the present application further provides a display panel including an analog positive power supply, a switching element, a source driving integrated circuit, and the data driving protection device, wherein the data driving protection device is connected with the analog positive power supply, the source driving integrated circuit, and the switching element disposed between the analog positive power supply and the source driving integrated circuit, respectively.
In addition, in order to achieve the above purpose, the present application further provides a display, which includes a backlight module and the display panel, where the backlight module is disposed on the back of the display panel and is used for providing a backlight source for the display panel.
The application provides a data driving protection circuit, a device, a display panel and a display, wherein the data driving protection circuit reduces charging voltage output by an analog positive power supply to obtain pre-charging voltage when a source driving integrated circuit is charged through a voltage-reducing pre-charging circuit, and outputs the pre-charging voltage to the source driving integrated circuit to pre-charge the source driving integrated circuit; and when the precharge voltage meets a preset condition, outputting a driving signal to drive the switching element to be conducted. According to the method, the source electrode driving integrated circuit is precharged by the precharge voltage after the charge voltage is reduced, and the switch element is controlled to be conducted when the precharge voltage meets the preset condition, so that the analog positive power supply outputs the charge voltage to the source electrode driving integrated circuit, and the problem that the analog positive power supply outputs large voltage or large current when being started is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it is apparent that the drawings in the following description are only drawings corresponding to the first embodiment, the second embodiment, the third embodiment, the embodiment of the display panel and the embodiment of the display of the array substrate of the present application, and other drawings may be obtained according to the structures illustrated in these drawings without any inventive effort for those skilled in the art.
FIG. 1 is a schematic diagram of a data driving protection circuit according to a first embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a data driving protection circuit according to a second embodiment of the present disclosure;
FIG. 3 is a circuit diagram of a second embodiment of a data driving protection circuit of the present application;
FIG. 4 is a timing diagram illustrating a source driver IC charging sequence in a second embodiment of the data driver protection circuit;
FIG. 5 is a schematic diagram of an embodiment of a display panel of the present application;
fig. 6 is a schematic structural diagram of an embodiment of a display of the present application.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the name |
| 10 | Driving circuit | 20 | Step-down precharge circuit |
| 30 | Voltage comparison circuit | U1 | First comparator |
| M1～M4 | First to fourth MOS transistors | R1～R2 | First to first resistors |
| AVDD | Analog positive power supply | Va | Reference power supply |
| Vb | Driving power supply | C1 | Precharge capacitor |
| 40 | Display panel | 50 | Backlight module |
| GND | Grounded (earth) |
The realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of a data driving protection circuit of the present application. A first embodiment of the data driving protection circuit of the present application is presented with reference to fig. 1.
In a first embodiment, the data driving protection circuit is configured to be connected to an analog positive power supply, a source driving circuit, and a switching element provided between the analog positive power supply and the source driving circuit, and includes: a driving circuit 10, the driving circuit 10 being connected to a switching element between an analog positive power supply and a source driving integrated circuit, the data driving protection circuit further comprising: a step-down precharge circuit 20;
wherein the step-down precharge circuit 20 is provided in parallel with the switching element between the analog positive power supply and the source driving integrated circuit.
The driving circuit 10 is a circuit for driving a switching element provided between an analog positive power supply and a source driving integrated circuit. The switching element is a component for controlling whether or not conduction between the analog positive power supply and the source driving integrated circuit is performed. When the charging voltage is normally supplied to the source driver integrated circuit, the driving switching element needs to be turned on to turn on the connection between the analog positive power supply and the source driver integrated circuit. The step-down precharge circuit 20 is a circuit for stepping down a charge voltage supplied from an analog positive power supply. The step-down precharge circuit 20 may also output the step-down charge voltage to the source driving integrated circuit, thereby precharging the source driving integrated circuit.
It should be understood that the source driving integrated circuit is a circuit for generating gray scale voltages to display various gray scale pictures through the display panel. The source drive integrated circuit can convert the voltage input by the analog positive power supply to obtain gray scale voltage.
In a specific implementation, the step-down precharge circuit 20 reduces the charging voltage output by the analog positive power supply to obtain a precharge voltage when charging the source driving integrated circuit, and outputs the precharge voltage to the source driving integrated circuit to precharge the source driving integrated circuit; the step-down precharge circuit 20 may also output the precharge voltage to the drive circuit 10; the driving circuit 10 may output a driving signal to drive the switching element to be turned on when the precharge voltage satisfies a preset condition, so that the analog positive power supply outputs the charge voltage to the source driving integrated circuit.
The precharge voltage is a voltage for precharging the source driving integrated circuit. The voltage value of the pre-charge voltage is smaller than the voltage value of the output charging voltage of the analog positive power supply. When the power supply is started, the source electrode driving integrated circuit is precharged through the precharge voltage, so that the current value or the voltage value passing instantly between the source electrode driving integrated circuit and the analog positive power supply can be reduced. The preset condition is a preset condition for determining the precharge voltage. The preset condition may be a preset reference voltage. When the voltage value of the pre-charge voltage reaches the voltage value of the reference voltage, the source driving integrated circuit has a certain voltage, the switching element is controlled to be conducted, the charging voltage of the analog positive power supply is input to the source driving integrated circuit through the switching element, and the instant change of current or voltage can be reduced. The driving signal is a signal generated and outputted by the driving circuit 10 for controlling the on or off of the switching element.
In a first embodiment of the data driving protection circuit, when the source driving integrated circuit is charged by the voltage-reducing precharge circuit, the data driving protection circuit reduces the charging voltage output by the analog positive power supply to obtain a precharge voltage, and outputs the precharge voltage to the source driving integrated circuit to precharge the source driving integrated circuit; and when the precharge voltage meets a preset condition, outputting a driving signal to drive the switching element to be conducted. In the first embodiment, the source driving integrated circuit is precharged by the precharge voltage after the charge voltage is reduced, and the switching element is controlled to be turned on when the precharge voltage meets the preset condition, so that the analog positive power supply outputs the charge voltage to the source driving integrated circuit, and the abnormality caused by outputting a large voltage or a large current when the analog positive power supply is started is avoided.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a second embodiment of the data driving protection circuit according to the present application, and the second embodiment of the data driving protection circuit according to the present application is proposed based on the first embodiment.
In this embodiment, the data driving protection circuit further includes: a voltage comparing circuit 30;
the voltage comparison circuit 30 is connected to the step-down precharge circuit 20 and the switching element, respectively.
The voltage comparison circuit 30 is a circuit for comparing the precharge voltage with the reference voltage. When the output voltage of the voltage comparison circuit 30 is the same as the voltage value output from the driving circuit 10, the voltage comparison circuit 30 may directly output a driving signal according to the comparison result to control the switching element. For example, when the switching element is turned on at a low level, the driving circuit 10 may output a low level signal with a certain voltage value to the control terminal of the switching element to control the switching element to be turned on; when the voltage comparison circuit 30 can output the low-level signal with the same voltage value, the voltage comparison circuit 30 can be directly connected to the control terminal of the switching element, and the switching element is controlled to be turned on by outputting the low-level signal with the same voltage value.
In a specific implementation, the voltage comparison circuit 30 may receive a precharge voltage for precharging the source driving integrated circuit, then compare the precharge voltage with a precharge reference voltage, and turn on the switching element when the precharge voltage is greater than the precharge reference voltage, that is, when the voltage value in the source driving integrated circuit has completed the precharge, and does not cause a large current or a large voltage, so that the voltage comparison circuit 30 may output a driving signal to drive the switching element to be turned on when the precharge voltage is greater than the precharge reference voltage. When the precharge voltage is smaller than the precharge reference voltage, the precharge of the source driving integrated circuit is not completed, and a large current or a large voltage may occur when the switching element is turned on, and the voltage comparison circuit 30 keeps the current output state to control the switching element to be turned off.
When the voltage value of the output of the voltage comparison circuit 30 is not the same as the voltage value corresponding to the output of the driving circuit 10, the driving circuit 10 is required to drive and control the switching element. For example, when the switching element needs to be turned on at a high level, the high-level voltage output from the voltage comparing circuit 30 does not reach the voltage required for the switching element to be turned on, and at this time, the output terminal of the voltage comparing circuit 30 is connected to the driving circuit 10, and the driving circuit 10 drives the switching element.
It should be appreciated that the reference voltage may be typically the maximum precharge voltage of the source drive integrated circuit, by which the source drive integrated circuit is not affected. Therefore, when a specific precharge voltage is set, a certain reference voltage can be set to realize the control of the magnitude of the precharge voltage. For example, when the reference voltage is 5V, the switching element is turned on when the precharge voltage reaches 5V, and the charge voltage is input to the power supply integrated management circuit. The voltage value of the reference voltage should be smaller than the maximum value of the precharge voltage after the step-down precharge circuit steps down, otherwise the voltage comparison circuit 30 cannot output the driving signal or the start signal. Naturally, the source driving integrated circuit can be precharged for a period of time by the precharge voltage, and then the input reference voltage is compared to control the switching element to be turned on.
In a specific implementation, the voltage comparing circuit 30 may further compare the precharge voltage with a precharge reference voltage, and output a start signal to the driving circuit 10 when the precharge voltage is greater than the precharge reference voltage; the driving circuit 10 may output a driving signal to drive the switching element to be turned on when receiving the start signal.
Wherein the start signal is a signal for controlling the driving circuit 10 to start controlling the driving switching element.
Referring to fig. 3, in the present embodiment, the driving circuit 10 includes a first MOS transistor M1, a second MOS transistor M2, a first resistor R1, and a driving power supply Vb;
the gate of the first MOS transistor M1 and the gate of the second MOS transistor M2 are connected to the output end of the voltage comparison circuit 30, the source of the first MOS transistor M1 is connected to the control end of the switching element and the source of the second MOS transistor M2, the drain of the second MOS transistor M2 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the driving power supply Vb, and the drain of the first MOS transistor M1 is grounded GND.
In this embodiment, the first MOS transistor M1 is a PMOS transistor, and the second MOS transistor is an NMOS transistor. Under the same moment, only one MOS tube can be conducted between the first MOS tube and the second MOS tube. When the first comparator U1 in the voltage comparison circuit 30 outputs a high-level start signal, a high level is provided for the grid electrodes of the first MOS tube and the second MOS tube, and at the moment, the first MOS tube is cut off, and the second MOS tube is turned on; the driving power supply Vb connected with the drain electrode of the second MOS tube can provide high-level driving voltage for the switching element, namely the grid electrode of the fourth MOS tube in fig. 3, through the first resistor R1 and the second MOS tube, so as to control the fourth MOS tube to be conducted. When the output end of the first comparator U1 in the voltage comparison circuit 30 outputs a low-level signal, the first MOS transistor is turned on, the second MOS transistor is turned off, and at this time, the gate of the fourth MOS transistor M4 is directly grounded GND through the first MOS transistor M1, and the fourth MOS transistor M4 is in an off state.
In a specific implementation, the precharge voltage after the voltage reduction by the third MOS transistor M3 is used for precharging the source driver integrated circuit, and at the same time, the precharge voltage is input to the forward input end of the first comparator U1, the voltage value of the reference power supply is input to the reverse input end, and when the voltage value of the precharge voltage is greater than the voltage value output by the reference power supply Va, the output end of the first comparator U1 outputs a high-level start signal to the gates of the first MOS transistor M1 and the second MOS transistor M2, and the second MOS transistor is turned on. The driving power supply Vb can provide high-level driving voltage for the grid electrode of the fourth MOS tube through the first resistor R1 and the second MOS tube M2, and the fourth MOS tube M4 is controlled to be conducted with the analog positive power supply AVDD so as to provide charging voltage for the source electrode driving integrated circuit through the fourth MOS tube.
In this embodiment, the step-down precharge circuit 20 includes: a third MOS tube M3 with preset resistance value;
the gate of the third MOS transistor M3 is connected to the driving power supply Vb in the driving circuit 10, the drain of the third MOS transistor M3 is connected to the analog positive power supply AVDD and the input end of the switching element, and the source of the third MOS transistor M3 is connected to the input end of the source driving integrated circuit, the voltage comparing circuit 30, and the output end of the switching element.
It should be understood that the fourth MOS transistor M4 is illustrated as a switching element in fig. 3. The fourth MOS tube is an NMOS tube, and is conducted when the voltage difference between the grid electrode and the source electrode exceeds a certain voltage threshold value. The third MOS tube is an NMOS tube with a certain resistance, and because the grid electrode of the third MOS tube is connected with the driving power supply Vb, the driving power supply Vb can provide a high-level signal for the grid electrode of the third MOS tube, so that the third MOS tube M3 is conducted, and the source electrode driving integrated circuit is precharged.
It should be noted that the third MOS transistor may be replaced by another switching transistor having the same threshold, or a resistor having a preset resistance may be directly used, which is not limited herein. The preset resistor is a preset resistor, the resistance value of the preset resistor is related to the pre-charging voltage, and when the third MOS tube M3 is set, the third MOS tube M3 with certain internal resistance can be selected according to the required pre-charging voltage.
In a specific implementation, a voltage division is formed between a preset resistance value of the third MOS transistor M3 and an internal resistance in the source driver integrated circuit, and the voltage division is performed by the third MOS transistor M3, so that the voltage of the charging voltage output by the analog positive power AVDD is reduced. For example, the internal resistance of the power management integrated chip is 50 ohms, the resistance value of the preset resistor can be set to be 50 ohms, and the voltage value input into the source driving integrated circuit, that is, the pre-charge voltage, is half of the voltage value of the output charge voltage of the analog positive power supply AVDD due to the voltage division effect of the resistor.
In this embodiment, the voltage comparing circuit 30 includes: a second resistor R2 and a first comparator U1;
the first end of the second resistor R2 is connected to the source of the third MOS transistor M3, the second end of the second resistor R2 is connected to the positive input end of the first comparator U1, the negative input end of the first comparator U1 is connected to the reference power Va, and the output end of the first comparator U1 is connected to the driving circuit 10.
It should be understood that the second resistor R2 may be a protection resistor, so as to avoid damage to the first comparator U1 caused by too high a voltage value of the precharge voltage. The reference power supply Va is a preset power supply, the reference power supply Va can be input through the reverse input end of the first comparator U1, the precharge voltage after passing through the second resistor R2 is connected through the positive input end of the first comparator U1, and when the voltage value of the precharge voltage is greater than the voltage value output by the reference power supply Va, the first comparator U1 outputs a high-level start signal; similarly, when the voltage value of the precharge voltage is smaller than the voltage value of the reference power supply Va, the first comparator U1 maintains the output low state.
In this embodiment, the data driving protection circuit further includes: an energy storage element;
the first end of the energy storage element is connected to the drain electrode of the third MOS transistor M3, the positive input end of the voltage comparison circuit 30, and the input end of the source driver integrated circuit, and the second end of the energy storage element is grounded to GND.
It should be understood that when the source driving integrated circuit is precharged, the charging time of the source driving integrated circuit and the voltage value of the precharge voltage may be controlled by setting the energy storage element. Referring to fig. 4, the precharge capacitor C1 is illustrated as an energy storage element in fig. 4. The precharge voltage needs to precharge the precharge capacitor C1 for a period of time between t0 and t1 before the source driver integrated circuit is charged, and since the precharge capacitor C1 is connected to the input terminal of the source driver integrated circuit, the voltage value of the precharge capacitor C1 is the same as the voltage value input to the source driver integrated circuit. The source driving integrated circuit is precharged after the precharge capacitor C1 is charged, and t1 to t2 are precharge times. After the time point t2, the analog positive power supply outputs a charging power supply to the source driving integrated circuit. The precharge time of the source driving integrated circuit can be effectively controlled by charging the precharge capacitor C1. In this embodiment, the charging time of the precharge capacitor C1 may be controlled by setting the capacity of the precharge capacitor C1, so as to control the charging time of the power supply integrated management circuit.
In the second embodiment, the voltage value of the pre-charging voltage is determined by the voltage comparison circuit, when the voltage value of the pre-charging voltage is larger than the voltage value of the reference voltage, the analog positive power supply is controlled to output the charging voltage to the source driving integrated circuit, and the starting time of the pre-charging is controlled by the charging time of the pre-charging capacitor, so that the abnormality caused by outputting a large voltage or a large current when the analog positive power supply is started can be more accurately avoided.
In addition, the application also provides a data driving protection device, which comprises the data driving protection circuit. The data driving protection device adopts all the technical schemes of all the embodiments, so that the data driving protection device has at least all the beneficial effects brought by the technical schemes of the embodiments, and is not described in detail herein.
In addition, the present application further proposes a display panel 40, referring to fig. 5, fig. 5 is a schematic structural diagram of an embodiment of the display panel of the present application, where the display panel includes an analog positive power supply, a switching element, a source driving integrated circuit, and the data driving protection device is connected to the analog positive power supply, the source driving integrated circuit, and the switching element disposed between the analog positive power supply and the source driving integrated circuit, respectively.
In addition, referring to fig. 6, fig. 6 is a schematic structural diagram of an embodiment of the display of the present application, where the display includes a backlight module 50 and the display panel 40 as described above, the backlight module is disposed on the back surface of the display panel 40, and the backlight module 50 is configured to provide a backlight source for the display panel 40.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the claims, and all equivalent structures or equivalent processes using the descriptions and drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the claims of the present application.
It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is correspondingly changed.
Furthermore, the descriptions of "first," "second," and the like, herein are for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the technical solutions should be considered that the combination of the technical solutions does not exist and is not within the protection scope of the present application.
Claims (8)
1. A data drive protection circuit for connection with an analog positive power supply, a source drive integrated circuit, and a switching element provided between the analog positive power supply and the source drive integrated circuit, the data drive protection circuit comprising: a driving circuit connected to a switching element between an analog positive power supply and a source driving integrated circuit, characterized in that the data driving protection circuit further includes: a step-down precharge circuit;
the step-down pre-charging circuit and the switching element are arranged in parallel between the analog positive power supply and the source electrode driving integrated circuit;
the step-down precharge circuit is used for reducing the charging voltage output by the analog positive power supply to obtain a precharge voltage when the source electrode driving integrated circuit is charged, and outputting the precharge voltage to the source electrode driving integrated circuit to precharge the source electrode driving integrated circuit so that the source electrode driving integrated circuit reaches the precharge voltage before the switching element is conducted;
the step-down precharge circuit is further configured to output the precharge voltage to the driving circuit;
the driving circuit is used for outputting a driving signal to drive the switching element to be conducted when the precharge voltage meets a preset condition, so that the analog positive power supply outputs the charge voltage to the source electrode driving integrated circuit, and the current value or the voltage value passing between the source electrode driving integrated circuit and the analog positive power supply instantaneously when the power is started is reduced;
the data driving protection circuit includes: a voltage comparison circuit;
the voltage comparison circuit is respectively connected with the step-down pre-charging circuit and the driving circuit;
the voltage comparison circuit is used for comparing the pre-charge voltage with a pre-charge reference voltage and outputting a starting signal to the driving circuit when the pre-charge voltage is larger than the pre-charge reference voltage;
the driving circuit is further used for outputting a driving signal to drive the switching element to be conducted when the starting signal is received;
the reference voltage does not affect the source driver integrated circuit.
2. The data drive protection circuit of claim 1, wherein the drive circuit comprises: the MOS transistor comprises a first MOS transistor, a second MOS transistor, a first resistor and a driving power supply;
the grid electrode of the first MOS tube and the grid electrode of the second MOS tube are connected with the output end of the voltage comparison circuit, the source electrode of the first MOS tube is connected with the control end of the switching element and the source electrode of the second MOS tube, the drain electrode of the second MOS tube is connected with the first end of the first resistor, the second end of the first resistor is connected with the driving power supply, and the drain electrode of the first MOS tube is grounded.
3. The data driving protection circuit of claim 2, wherein the buck precharge circuit comprises: a third MOS tube with preset resistance value;
the grid electrode of the third MOS tube is connected with a driving power supply in the driving circuit, the drain electrode of the third MOS tube is respectively connected with the analog positive power supply and the input end of the switching element, and the source electrode of the third MOS tube is respectively connected with the input end of the source electrode driving integrated circuit, the voltage comparison circuit and the output end of the switching element.
4. The data drive protection circuit of claim 3, wherein the voltage comparison circuit comprises: a second resistor and a first comparator;
the first end of the second resistor is connected with the source electrode of the third MOS tube, the second end of the second resistor is connected with the forward input end of the first comparator, the reverse input end of the first comparator is connected with a reference power supply, and the output end of the first comparator is connected with the driving circuit.
5. The data drive protection circuit of any of claims 3-4, wherein the data drive protection circuit further comprises: an energy storage element;
the first end of the energy storage element is respectively connected with the drain electrode of the third MOS tube, the positive input end of the voltage comparison circuit and the input end of the source electrode driving integrated circuit, and the second end of the energy storage element is grounded.
6. A data drive protection device comprising the data drive protection circuit of any one of claims 1-5.
7. A display panel, the display panel comprising: the data driving protection device of claim 6, wherein the data driving protection device is connected to the analog positive power supply, the source driving integrated circuit, and a switching element provided between the analog positive power supply and the source driving integrated circuit, respectively.
8. A display, comprising a backlight module and the display panel of claim 7, wherein the backlight module is disposed on the back of the display panel and is configured to provide a backlight source to the display panel.
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| CN114863879B (en) * | 2022-05-23 | 2023-05-02 | 惠科股份有限公司 | Organic light emitting diode control circuit and display panel |
| CN115331618B (en) * | 2022-10-12 | 2023-01-06 | 惠科股份有限公司 | Drive circuit, display panel and display device |
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