CN112951173B - Grid opening voltage generation circuit, display panel driving device and display device - Google Patents
Grid opening voltage generation circuit, display panel driving device and display device Download PDFInfo
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- CN112951173B CN112951173B CN202110159262.2A CN202110159262A CN112951173B CN 112951173 B CN112951173 B CN 112951173B CN 202110159262 A CN202110159262 A CN 202110159262A CN 112951173 B CN112951173 B CN 112951173B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- 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
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- Crystallography & Structural Chemistry (AREA)
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a grid opening voltage generating circuit, a display panel driving device and a display device, wherein the grid opening voltage generating circuit comprises: turning on/off a voltage output terminal; a voltage detection circuit, the detection end of which is connected with the on/off voltage output end so as to detect the voltage output by the on/off voltage output end and output a corresponding voltage detection signal; the input end of the switch control circuit is connected with the output end of the voltage detection circuit, and corresponding switch control signals are output according to the received voltage detection signals; the voltage switching circuit comprises a first input end and a second input end, wherein the first input end is connected with a first voltage value, and the second input end is connected with a second voltage value; the voltage switching circuit is used for outputting a corresponding input voltage value to the on/off voltage output end when receiving the switch control signal. The invention also discloses a display panel driving device and a display device. The invention can intelligently switch the input voltage to ensure the voltage level of the output voltage and reduce the power consumption.
Description
Technical Field
The present invention relates to the field of display driving technologies, and in particular, to a gate-on voltage generating circuit, a display panel driving apparatus, and a display apparatus.
Background
With the development of display driving technology, large-screen liquid crystal displays are widely used in large-size televisions, wide-screen computers and other household electrical appliances, and with the popularization of large-size screen televisions, a higher and higher gate-on voltage Vgh is required to ensure the charging effect of Thin Film Transistor TFTs (Thin Film transistors).
The existing display detects the actual voltage level of the grid opening voltage Vgh, when the voltage level of the grid opening voltage Vgh is insufficient, the input voltage of the grid opening voltage Vgh generating circuit is switched to high level input voltage to ensure the voltage level of the grid opening voltage Vgh, and the switching mode is not intelligent enough, and the problems that the power consumption of the display is too high after switching and the application is inconvenient exist.
Disclosure of Invention
The invention mainly aims to provide a grid opening voltage generating circuit, a display panel driving device and a display.
The purpose is to realize intelligent switching of input voltage.
To achieve the above object, the present invention provides a gate-on voltage generating circuit, which includes:
turning on/off a voltage output terminal;
the detection end of the voltage detection circuit is connected with the on/off voltage output end, and the voltage detection circuit is used for detecting the voltage output by the on/off voltage output end and outputting a corresponding voltage detection signal;
the input end of the switch control circuit is connected with the output end of the voltage detection circuit, and the switch control circuit is used for outputting a first switch control signal or a second switch control signal according to the received voltage detection signal;
the voltage switching circuit comprises a controlled end, a first input end and a second input end, the controlled end of the voltage switching circuit is connected with the switch control circuit, the first input end is connected with a first voltage value, and the second input end is connected with a second voltage value; the voltage switching circuit is used for outputting the first voltage value when receiving the first switch control signal; outputting the second voltage value when the second switch control signal is received; wherein the first voltage value is less than the second voltage value.
Optionally, the gate-on voltage generating circuit further includes:
the input end of the voltage generating circuit is connected with the output end of the voltage switching circuit, and the output end of the voltage generating circuit is connected with the on/off voltage output end; the voltage generating circuit is used for performing power conversion on the first voltage value or the second voltage value which is connected in and then outputting the first voltage value or the second voltage value to the on/off voltage output end.
Optionally, the gate-on voltage generating circuit further includes:
and the control end of the power management integrated circuit is connected with the controlled end of the voltage generation circuit, and the power management integrated circuit is used for controlling the voltage generation circuit to work so as to output the accessed first voltage value or the accessed second voltage value to the on/off voltage output end after power conversion.
Optionally, the switch control circuit includes:
the inverting input end of the voltage comparator is the input end of the switch control circuit, and the non-inverting input end of the voltage comparator is used for accessing a reference voltage signal; the voltage comparator is used for outputting a switch trigger signal when the voltage detection signal is smaller than the reference voltage signal;
the controlled end of the switch trigger circuit is connected with the output end of the voltage comparator; the output end of the switch trigger circuit is the output end of the switch control circuit, and the switch trigger circuit is used for being started when receiving the switch trigger signal so as to output the second switch control signal.
Optionally, the power management integrated circuit is connected to a non-inverting input terminal of the voltage comparator, and the power management integrated circuit is configured to provide a reference voltage signal to the voltage comparator.
Optionally, the switch trigger circuit includes: the controlled end of the first switch tube is the controlled end of the switch trigger circuit, the controlled end is grounded through the pull-down resistor, the input end of the first switch tube is connected with the second voltage value through the pull-up resistor, and the output end of the first switch tube is grounded; the common end of the first switch tube and the pull-up resistor is the output end of the switch trigger circuit and is used for outputting the second switch control signal.
Optionally, the voltage switching circuit includes:
the input end of the second switching tube is the first input end, the controlled end of the second switching tube is connected with the common end of the voltage comparator and the switch trigger circuit, and the output end of the second switching tube is connected with the input end of the voltage generation circuit and used for outputting the first voltage value to the voltage generation circuit when the voltage switching circuit receives the first switch control signal;
and the input end of the third switching tube is the second input end, the controlled end of the third switching tube is connected with the common end of the first switching tube and the pull-up resistor, and the output end of the third switching tube is connected with the common end of the second switching tube and the voltage generating circuit, and is used for outputting the second voltage value to the voltage generating circuit when the voltage switching circuit receives the second switching control signal.
Optionally, the voltage detection circuit includes a first resistor and a second resistor, a first end of the first resistor is a detection end of the voltage detection circuit, a second end of the first resistor is grounded via the second resistor, and a common end of the first resistor and the second resistor is an output end of the voltage detection circuit.
The invention also provides a display panel driving device which comprises the grid opening voltage generating circuit.
The invention also provides a display device, which is characterized by comprising the grid opening voltage generating circuit or the display panel driving device.
The grid opening voltage generating circuit is provided with an opening/closing voltage output end, a voltage detection circuit, a switch control circuit and a voltage switching circuit, detects the real-time voltage of the grid opening voltage Vgh of the opening/closing voltage output end through the voltage detection circuit, and outputs a voltage detection signal to the switch control circuit, so that the switch control circuit outputs a corresponding switch control signal to the voltage switching circuit according to the received voltage detection signal and a reference voltage signal, and the voltage switching circuit is controlled to work. Specifically, when the voltage value corresponding to the voltage detection signal is greater than or equal to the voltage value corresponding to the reference voltage signal, the switch control circuit controls the voltage switching circuit to output the first voltage value HVAA, and when the voltage value corresponding to the voltage detection signal is less than the voltage value corresponding to the reference voltage signal, the switch control circuit controls the voltage switching circuit to switch and output the second voltage value VAA. The grid opening voltage generating circuit can switch the input voltage to be the second voltage value VAA when the voltage level of the opening/closing voltage output end is lower than the voltage level corresponding to the reference voltage signal so as to ensure the voltage level of the output voltage; and when the gate-on voltage Vgh does not need to be over-high, the voltage switching circuit can switch or continuously keep the input voltage to be the first voltage value HVAA with a lower voltage level, which is beneficial to reducing the power consumption of the gate-on voltage generating circuit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of a gate-on voltage generating circuit according to an embodiment of the present invention;
FIG. 2 is a functional block diagram of a gate-on voltage generating circuit according to another embodiment of the present invention;
FIG. 3 is a circuit diagram of a gate-on voltage generating circuit according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of an embodiment of the voltage generating circuit of FIG. 2;
FIG. 5 is a timing diagram of the connections of the circuit of the embodiment shown in FIG. 4.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
It should be noted that all directional indicators (such as up, down, left, right, front, back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; may be directly connected or may be indirectly defined through intervening media. It will be understood by those skilled in the art that the above-described connections may be made between two elements or between two elements unless otherwise specifically indicated herein.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a grid starting voltage generating circuit, which is applied to a display device, wherein the display device can be a display device with a display panel, such as a mobile phone, a computer, a projector, a television and the like, and is particularly suitable for a liquid crystal display device. In order to better illustrate the present invention, the following examples of the present invention are illustrated by taking a liquid crystal display as an example.
Referring to fig. 1 to 5, in an embodiment of the present invention, the gate-on voltage generating circuit includes:
an on/off voltage output terminal 10;
a voltage detection circuit 20, a detection end of the voltage detection circuit 20 is connected to the on/off voltage output end 10, and the voltage detection circuit 20 is configured to detect a voltage output by the on/off voltage output end 10 and output a corresponding voltage detection signal;
the input end of the switch control circuit 30 is connected with the output end of the voltage detection circuit 20, and the switch control circuit 30 is configured to output a first switch control signal or a second switch control signal according to the received voltage detection signal;
the voltage switching circuit 40, the voltage switching circuit 40 includes a controlled end, a first input end and a second input end, the controlled end of the voltage switching circuit 40 is connected with the switch control circuit, the first input end is connected to a first voltage value HVAA, and the second input end is connected to a second voltage value VAA; the voltage switching circuit 40 is configured to output the first voltage value HVAA when receiving the first switch control signal; outputting the second voltage value VAA when the second switch control signal is received; the first voltage value HVAA is smaller than the second voltage value VAA.
The gate-on voltage generation circuit further includes:
a voltage generating circuit 50, an input terminal of the voltage generating circuit 50 is connected to an output terminal of the voltage switching circuit 40, and an output terminal of the voltage generating circuit 50 is connected to the on/off voltage output terminal 10; the voltage generating circuit 50 is configured to perform power conversion on the first voltage value HVAA or the second voltage value VAA and output the converted voltage value to the on/off voltage output terminal 10.
The voltage generating circuit 50 may be a circuit for generating the gate-on voltage Vgh, or may be a circuit for generating the gate-off voltage Vgl. The gate-on voltage Vgh generating circuit 50 is typically a capacitive DC/DC boost circuit, and the gate-off voltage Vgl generating circuit is typically a capacitive DC/DC buck circuit. The input terminal of the voltage generating circuit 50 is connected to the output terminal of the voltage switching circuit 40, and the voltage generating circuit 50 performs corresponding DC/DC conversion according to the first voltage value HVAA or the second voltage value VAA output by the voltage switching circuit 40, and outputs a corresponding gate-on voltage Vgh or a corresponding gate-off voltage Vgl. In the present embodiment, the voltage generating circuit 50 is taken as an example of a generating circuit of the gate-on voltage Vgh.
In the present embodiment, the first voltage value HVAA and the second voltage value VAA can be used as input voltages of the gate-on voltage Vgh generation Circuit 50 (the first voltage value HVAA and the second voltage value VA a can be obtained by the power management chip 60 through corresponding DC/DC (Direct Circuit Direct current-Direct current) conversion, and the voltage value of the second voltage value VAA is greater than that of the first voltage value HVAA). The on/off voltage output terminal 10 is an output terminal of the gate-on voltage Vgh generating circuit 50, and the gate-on voltage Vgh generating circuit 50 can output the gate-on voltage Vgh of a corresponding voltage level according to input voltages of different voltage levels.
The voltage detection circuit 20 may be implemented using a plurality of resistance element electrical connections. The detection terminal of the voltage detection circuit 20 is connected to the on/off voltage output terminal 10 to detect the real-time voltage level of the gate-on voltage Vgh or the gate-off voltage Vgl, and output a voltage detection signal having a corresponding level.
The switch control circuit 30 may be implemented by a control circuit composed of a voltage comparator 31 and discrete electronic components such as a switching device, or may be implemented by an integrated circuit such as a single chip, a DSP, or an FPGA. When the switch control circuit 30 is implemented by using an integrated circuit, a person skilled in the art can implement setting of the reference voltage of the voltage detection signal by integrating related hardware circuits, such as a comparator, a DC/DC conversion circuit, and a filter, and a software program or algorithm into the integrated circuit, or by integrating hardware circuits, such as a comparator, a DC/DC conversion circuit, and a filter, or by integrating a software program or algorithm program for analyzing and comparing the received voltage detection signal. The analog voltage detection signal is converted into a digital signal by operating or executing a software program and/or module stored in the integrated circuit and calling data stored in the memory, and the voltage detection signal converted into the digital signal is compared, analyzed and the like by a DC/DC conversion circuit integrated in the integrated circuit so as to judge whether the output voltage corresponding to the voltage detection signal is matched with the reference voltage. The switch control circuit 30 outputs a corresponding switch control signal to the voltage switching circuit 40 according to the comparison result between the output voltage corresponding to the voltage detection signal and the reference voltage. The first switch control signal may be a high level signal, and the second switch control signal may be a low level signal. Alternatively, the first switch control signal may be a low level signal, and the second switch control signal may be a high level signal. Or, both the first switch control signal and the second switch control signal are high-level signals or low-level signals. In this embodiment, the first switch control signal is a high-level signal, and the second switch control signal is a low-level signal.
The voltage switching circuit 40 can be implemented by any one or more of a triode, a MOS transistor, and an IGBT electronic switch. The voltage inputted to the first input terminal of the voltage switching circuit 40 is the first voltage value HVAA, the voltage inputted to the second input terminal is the second voltage value VAA, and specifically, the input voltage of the voltage generating circuit 50 is switched to be the first voltage value HVAA or the second voltage value VAA according to the first switch control signal and the second switch control signal outputted from the switch control circuit 30. For example: when the voltage value corresponding to the voltage detection signal is greater than or equal to the voltage value corresponding to the reference voltage signal, the switch control circuit 30 may output a first switch control signal with a high level to the voltage switching circuit 40, so that the voltage switching circuit 40 outputs a first voltage value HVAA to the on/off voltage output terminal 10; when the voltage value corresponding to the voltage detection signal is smaller than the voltage value corresponding to the reference voltage signal, the switch control circuit outputs a second switch control signal with a low level to the voltage switching circuit 40, so that the voltage switching circuit 40 outputs a second voltage value VAA to the on/off voltage output terminal 10. Of course, in other embodiments, the second voltage value VAA may be switched by a high-level signal, and the input voltage is maintained as the first voltage value HVAA by a low-level signal, which may be specifically set according to practical applications, and is not limited herein.
The gate-on voltage generating circuit of the present invention is provided with the on/off voltage output terminal 10, the voltage detecting circuit 20, the switch control circuit 30 and the voltage switching circuit 40, and detects the real-time voltage of the gate-on voltage Vgh of the on/off voltage output terminal 10 through the voltage detecting circuit 20, and outputs the voltage detecting signal to the switch control circuit 30, so that the switch control circuit 30 outputs the corresponding switch control signal to the voltage switching circuit 40 according to the received voltage detecting signal and the reference voltage signal, thereby controlling the voltage switching circuit 40 to operate. Specifically, when the voltage value corresponding to the voltage detection signal is greater than or equal to the voltage value corresponding to the reference voltage signal, the switch control circuit 30 controls the voltage switching circuit 40 to output the first voltage value HVAA, and when the voltage value corresponding to the voltage detection signal is less than the voltage value corresponding to the reference voltage signal, the switch control circuit 30 controls the voltage switching circuit 40 to output the second voltage value VAA. The gate-on voltage generation circuit of the present invention can switch the input voltage to the second voltage value VAA when the voltage level of the on/off voltage output terminal 10 is lower than the voltage level corresponding to the reference voltage signal, so as to ensure the voltage level of the output voltage; and when the gate-on voltage Vgh does not need to be over high voltage level, the voltage switching circuit 40 can switch or continuously keep the input voltage to be the first voltage value HVAA with lower voltage level, which is beneficial to reducing the power consumption of the gate-on voltage generating circuit.
Referring to fig. 1 to 5, in an embodiment of the present invention, the gate-on voltage generating circuit further includes:
a power management integrated circuit 60, a control terminal of the power management integrated circuit 60 is connected to the controlled terminal of the voltage generation circuit 50, and the power management integrated circuit 60 is configured to control the voltage generation circuit 50 to operate so as to output the accessed first voltage HVAA or the accessed second voltage VAA to the on/off voltage output terminal 10 after performing power conversion.
The power management integrated circuit 60 may be implemented by a power management chip 60 integrated with a microprocessor such as an MCU, a DSP, or an FPGA, and related hardware circuits and software programs or algorithms, and the type of the power management chip 60 may be an AC/DC power management chip, a DC/DC power management chip, or a PWM/PFM power management chip. When the application device is a liquid crystal display, the power management chip 60 integrates a plurality of DC/DC conversion circuits with different circuit functions, and each DC/DC conversion circuit can output different voltage values to other circuit modules of the liquid crystal display to control the working state of the corresponding circuit module, for example, the power management chip 60 can output a common electrode voltage to a common electrode, or output a digital working voltage to the row driving integrated circuit.
Further, in an optional embodiment, the control terminal of the power management chip 60 outputs the period control signal and the conduction control signal to the voltage generation circuit 50 to control the voltage generation circuit 50 to generate the gate-on voltage Vgh corresponding to the voltage level. The voltage generating circuit 50 may be implemented by diodes (D1-D2), capacitors (C1-C3), and a transistor T1, wherein the capacitor C1 is connected to the period control pin LX of the power management chip 60 and is configured to receive the period control signal output by the power management chip 60, a control electrode of the transistor T1 is connected to the output pin DRVP of the power management chip 60, and the transistor T1 is configured to output a gate-on voltage Vgh to the on/off voltage output terminal 10 when receiving the conduction control signal output by the power management chip 60. The capacitor C2 and the capacitor C3 are energy storage capacitors, the first voltage value HVAA is an input voltage of a gate start voltage Vgh, the period control signal output by the period control pin LX is switched between 0V and a second voltage value VAA, when the period control signal is 0V, the first voltage value HVAA charges the capacitor C1 through the diode D1, the capacitor C2 is charged through the diode D2, and the voltage levels at the a/B point are the first voltage value HVAA (the on-state voltages of the diodes D1 to D3 are ignored); when the periodic control signal is the second voltage value VAA, due to a capacitive coupling effect, the voltage level at the point a is the first voltage value HVAA + the second voltage value VAA, meanwhile, the diode D2 is turned on, the capacitor C1 charges the capacitor C2, and the voltage level at the point B is also the first voltage value HVAA + the second voltage value VAA, at this time, the power management chip 60 controls the output pin DRVP to output the on control signal, so that the transistor T1 is turned on, the capacitor C2 charges the capacitor C3 through the transistor T1, and the voltage level of the gate-on voltage Vgh output by the circuit is the first voltage value HVAA + the second voltage value VAA- Δ T1 (Δ T1 is a voltage difference between two ends of T1). The power management integrated circuit 60 outputs the related control signal to the voltage generation circuit 50 to control the voltage generation circuit 50 to generate the output voltage with the corresponding voltage level according to the received input voltage, thereby implementing the adjustment of the voltage level of the output voltage.
Referring to fig. 1 to 5, in an embodiment of the present invention, the switch control circuit 30 includes:
a voltage comparator 31, an inverting input terminal of the voltage comparator 31 is an input terminal of the switch control circuit 30, and a non-inverting input terminal of the voltage comparator 31 is used for accessing a reference voltage signal; the voltage comparator 31 is configured to output a switch trigger signal when the voltage detection signal is smaller than the reference voltage signal;
a switch trigger circuit 32, wherein a controlled end of the switch trigger circuit 32 is connected with an output end of the voltage comparator 31; the output end of the switch triggering circuit 32 is the output end of the switch control circuit 30, and the switch triggering circuit 32 is configured to be turned on when receiving the switch triggering signal, so as to output the second switch control signal.
The power management integrated circuit 60 is connected to the non-inverting input terminal of the voltage comparator 31, and the power management integrated circuit 60 is configured to provide a reference voltage signal to the voltage comparator 31.
In this embodiment, the reference voltage signal connected to the unidirectional input terminal of the voltage comparator 31 may be generated by the power management chip 60, and the inverting input terminal of the voltage comparator 31 is configured to receive the voltage detection signal output by the voltage detection circuit 20, compare the voltage value corresponding to the voltage detection signal with the voltage value corresponding to the reference voltage signal, and output the corresponding switch trigger signal according to the comparison result. For example, when the voltage value corresponding to the voltage detection signal is smaller than the voltage value corresponding to the reference voltage signal, which indicates that the voltage level of the gate-on voltage Vgh is insufficient, the voltage comparator 31 outputs a high-level switch trigger signal to the switch trigger circuit 32; when the voltage value corresponding to the voltage detection signal is greater than or equal to the voltage value corresponding to the reference voltage signal, which indicates that the voltage level of the gate-on voltage Vgh exceeds, the voltage comparator 31 outputs a low-level switch trigger signal to the switch trigger circuit 32.
The switch triggering circuit 32 is turned on when receiving the switch triggering signal with a high level, and outputs a second switch control signal to control the switch switching circuit 40 to switch the input voltage to the second voltage value VAA. The switch triggering circuit 32 is turned off when receiving the switch triggering signal of low level, and outputs a first switch control signal to control the switch switching circuit 40 to switch or keep the input voltage at the first voltage value HVAA. Therefore, the real-time voltage level of the output voltage can be intelligently detected, two switch control signals are output according to the detection result, the intelligent switching of two input voltages is controlled, and the power consumption is reduced.
Referring to fig. 1 to 5, in an embodiment of the present invention, the switch triggering circuit 32 includes:
a first switch tube M1, a pull-down resistor R4, and a pull-up resistor R3, where a controlled end of the first switch tube M1 is a controlled end of the switch trigger circuit 32, the controlled end is grounded through the pull-down resistor R4, an input end of the first switch tube M1 is connected to the second voltage value VAA through the pull-up resistor R3, and an output end of the first switch tube M1 is grounded; the common end of the first switch tube M3 and the pull-up resistor R3 is the output end of the switch trigger circuit 32, and is configured to output the second switch control signal.
In this embodiment, the first switch transistor M1 may be implemented by a single N-MOS transistor, and may also be implemented by a P-MOS transistor. The grid electrode of the N-MOS tube is the controlled end of the first switch tube M1; the drain electrode of the N-MOS tube is the output end of the first switch tube M1 and is grounded; the source electrode of the N-MOS transistor is an input end of the first switch transistor M1, the common end of the source electrode of the N-MOS transistor and the pull-up resistor R3 is an output end of the switch trigger circuit 32, and the output end of the switch trigger circuit 32 is used for outputting a second switch control signal when the first switch transistor M1 is turned on. When the voltage level of the gate-on voltage Vgh is not sufficient, the voltage comparator 31 outputs a high level to control the first switch transistor M1 to be turned on, so that the common terminal of the source and the pull-up resistor R3 outputs a second switch control signal of a low level, and the input voltage of the voltage generation circuit 50 is switched to the second voltage value VAA. The grid starting voltage generating circuit can output two switch control signals by using one switch device, simplifies the control degree and saves the cost.
Referring to fig. 1 to 5, in an embodiment of the present invention, the voltage switching circuit 40 includes:
a second switch tube M2, an input end of the second switch tube M2 being the first input end, a controlled end of the second switch tube M2 being connected to the common end of the voltage comparator 31 and the switch trigger circuit 32, an output end of the second switch tube M2 being connected to an input end of the voltage generation circuit 50, and configured to output the first voltage value HVAA to the voltage generation circuit 50 when the voltage switching circuit 40 receives the first switch control signal;
a third switch M3, wherein an input terminal of the third switch M3 is a second input terminal of the voltage switching circuit 40, a controlled terminal of the third switch M3 is connected to a common terminal of the first switch M1 and the pull-up resistor R3, and an output terminal of the third switch M3 is connected to the second switch M2 and an input terminal of the voltage generating circuit 50, and configured to output the second voltage value VAA to the voltage generating circuit 50 when the voltage switching circuit 40 receives the second switch control signal.
In this embodiment, the second switch M2 and the third switch M3 may be implemented by any one or a combination of a triode, a MOS transistor, and an IGBT electronic switch. In an alternative embodiment, the second switching transistor M2 and the third switching transistor M3 are implemented by using a single P-MOS transistor, and are turned on at a low level. The grid, the source and the drain of the P-MOS transistor M2 are a controlled end, an input end and an output end of the second switch transistor M2 in sequence. The grid electrode of the P-MOS tube M3 is the controlled end of the third switching tube M3, the source electrode of the M3 of the P-MOS tube is the input end of the third switching tube M3, and the drain electrode of the M3 of the P-MOS tube is the output end.
When the voltage level of the gate-on voltage Vgh is greater than or equal to the voltage level corresponding to the reference voltage signal, the voltage value corresponding to the voltage detection signal is greater than or equal to the voltage value corresponding to the reference voltage signal, the voltage comparator 31 outputs a low level and outputs a first switch control signal of the low level, so that the second switch tube M2 is turned on to switch or continuously maintain the input voltage of the voltage generation circuit 50 at the first voltage value HVAA, at this time, the first switch tube M1 is controlled by the voltage comparator 31 to be turned off, and due to the presence of the pull-up resistor R3, the common end of the first switch tube M1 and the pull-up resistor R3 is at the high level, so that the third switch tube M3 is turned off. When the voltage level of the gate-on voltage Vgh is less than the voltage level corresponding to the reference voltage signal, the voltage value corresponding to the voltage detection signal is less than the voltage value corresponding to the reference voltage signal, and at this time, the voltage comparator 31 outputs a high level to turn off the second switching tube M2, the first switching tube M1 is controlled by the voltage comparator 31 to be turned on, and the level of the common end of the first switching tube M1 and the pull-up resistor R3 is pulled down, so that the second switching control signal of a low level is output to control the third switching tube M3 to be turned on, and the input voltage of the switching voltage generation circuit 50 is the second voltage value VAA. Therefore, the intelligent switching of the input voltage is realized, and when the output voltage does not need the overhigh voltage level, the input voltage can be switched or continuously kept to be the first voltage value HVAA with the lower voltage level, so that the reduction of the power consumption of the grid opening voltage generation circuit is facilitated.
Referring to fig. 1 to 5, in an embodiment of the present invention, the voltage detection circuit 20 includes: the first end of the first resistor R1 is the detection end of the voltage detection circuit 20, the first resistor R1 is grounded through the second resistor R2, and the common end of the first resistor R1 and the second resistor R2 is the output end of the voltage detection circuit 20.
In this embodiment, the first resistor R1 and the second resistor R2 are used for serial voltage division to detect the voltage of the on/off voltage output terminal 10, and according to the voltage division principle, the larger the ratio of the first resistor R1 to the second resistor R2 is, the larger the voltage divided by the first resistor R1 is. Thus, the magnitude of the detection signal output to the voltage comparator 31 can be adjusted by adjusting the resistance value of the first resistor R1 and/or the second resistor R2, and the sensitivity of the voltage comparator 31 to voltage detection can be adjusted.
The invention also provides a display panel driving device, which comprises the grid starting voltage generating circuit; the detailed structure of the gate-on voltage generation circuit can refer to the above embodiments, and is not described herein again; it can be understood that, since the gate-on voltage generation circuit is used in the display panel driving apparatus, the embodiment of the display panel driving apparatus includes all technical solutions of all embodiments of the gate-on voltage generation circuit, and the achieved technical effects are completely the same, and are not described herein again.
The invention also provides a display device which comprises the grid opening voltage generating circuit or the display panel driving device.
The display comprises the grid starting voltage generating circuit; the detailed structure of the gate-on voltage generation circuit can refer to the above embodiments, and is not described herein again; it can be understood that, since the gate-on voltage generation circuit is used in the display device, the embodiments of the display device include all technical solutions of all embodiments of the gate-on voltage generation circuit, and the achieved technical effects are also completely the same, and are not described herein again. The display device may further include the display panel driving device, which is described above and is not described herein again.
The above description is only an alternative embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, which are within the spirit of the present invention, are included in the scope of the present invention.
Claims (7)
1. A gate-on voltage generation circuit, the gate-on voltage generation circuit comprising:
turning on/off a voltage output terminal;
the detection end of the voltage detection circuit is connected with the on/off voltage output end, and the voltage detection circuit is used for detecting the voltage output by the on/off voltage output end and outputting a corresponding voltage detection signal;
the input end of the switch control circuit is connected with the output end of the voltage detection circuit, and the switch control circuit is used for outputting a first switch control signal or a second switch control signal according to the received voltage detection signal;
the voltage switching circuit comprises a controlled end, a first input end and a second input end, the controlled end of the voltage switching circuit is connected with the switch control circuit, the first input end is connected with a first voltage value, and the second input end is connected with a second voltage value; the voltage switching circuit is used for outputting the first voltage value when receiving the first switch control signal; outputting the second voltage value when the second switch control signal is received; wherein the first voltage value is less than the second voltage value;
the gate-on voltage generation circuit further includes:
the input end of the voltage generating circuit is connected with the output end of the voltage switching circuit, and the output end of the voltage generating circuit is connected with the on/off voltage output end; the voltage generating circuit is used for performing power supply conversion on the first voltage value or the second voltage value which is connected in and then outputting the first voltage value or the second voltage value to the on/off voltage output end; and the number of the first and second groups,
the control end of the power management integrated circuit is connected with the controlled end of the voltage generation circuit, and the power management integrated circuit is used for controlling the voltage generation circuit to work so as to output the accessed first voltage value or the accessed second voltage value to the on/off voltage output end after power conversion;
the switch control circuit includes:
the inverting input end of the voltage comparator is the input end of the switch control circuit, and the non-inverting input end of the voltage comparator is used for accessing a reference voltage signal; the voltage comparator is used for outputting a switch trigger signal when the voltage detection signal is smaller than the reference voltage signal;
the controlled end of the switch trigger circuit is connected with the output end of the voltage comparator; the output end of the switch trigger circuit is the output end of the switch control circuit, and the switch trigger circuit is used for being started when receiving the switch trigger signal so as to output the second switch control signal.
2. The gate-on voltage generation circuit of claim 1, wherein the power management integrated circuit is coupled to a non-inverting input of the voltage comparator, the power management integrated circuit configured to provide a reference voltage signal to the voltage comparator.
3. The gate-on voltage generation circuit of claim 1, wherein the switch trigger circuit comprises: the controlled end of the first switch tube is the controlled end of the switch trigger circuit, the controlled end is connected with the output end of the voltage comparator, the input end of the first switch tube is connected with the second voltage value through the pull-up resistor, and the output end of the first switch tube is grounded; the common end of the first switch tube and the pull-up resistor is the output end of the switch trigger circuit and is used for outputting the second switch control signal.
4. The gate-on voltage generation circuit of claim 3, wherein the voltage switching circuit comprises:
the input end of the second switch tube is the first input end, the controlled end of the second switch tube is connected with the common end of the voltage comparator and the switch trigger circuit, and the output end of the second switch tube is connected with the input end of the voltage generation circuit, so that when the voltage switching circuit receives the first switch control signal, the first voltage value is output to the voltage generation circuit;
and the input end of the third switching tube is the second input end, the controlled end of the third switching tube is connected with the common end of the first switching tube and the pull-up resistor, and the output end of the third switching tube is connected with the common end of the second switching tube and the voltage generating circuit, and is used for outputting the second voltage value to the voltage generating circuit when the voltage switching circuit receives the second switch control signal.
5. The gate-on voltage generation circuit of any one of claims 1 to 4, wherein the voltage detection circuit comprises a first resistor and a second resistor, a first terminal of the first resistor is a detection terminal of the voltage detection circuit, a second terminal of the first resistor is grounded via the second resistor, and a second terminal of the second resistor is an output terminal of the voltage detection circuit.
6. A display panel driving apparatus, characterized in that the display panel driving apparatus comprises the gate-on voltage generating circuit according to any one of claims 1 to 5.
7. A display device, characterized in that the display device comprises:
display panel, and
the gate-on voltage generation circuit of any one of claims 1 to 5;
or comprising display panel driving means as claimed in claim 6.
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| KR102276246B1 (en) * | 2014-12-24 | 2021-07-13 | 엘지디스플레이 주식회사 | Display Device and Driving Method thereof |
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