CN113506546B - Chamfering circuit, driving device and display device - Google Patents
Chamfering circuit, driving device and display device Download PDFInfo
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- CN113506546B CN113506546B CN202110709468.8A CN202110709468A CN113506546B CN 113506546 B CN113506546 B CN 113506546B CN 202110709468 A CN202110709468 A CN 202110709468A CN 113506546 B CN113506546 B CN 113506546B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
- G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
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Abstract
The invention provides a chamfering circuit, a driving device and a display device, wherein the chamfering circuit comprises a first switch circuit, a second switch circuit, a third switch circuit, a first energy storage circuit, a second energy storage circuit and a current limiting circuit, the first switch circuit and the second switch circuit are conducted initially, the third switch circuit is turned off, the second energy storage circuit is charged, the chamfering circuit outputs a first voltage, the first voltage is a row starting signal in a row scanning signal, chamfering processing is carried out after a first preset time length, the first switch circuit and the second switch circuit are turned off, the third switch circuit is conducted, the second energy storage circuit charges the first energy storage circuit through the current limiting circuit, the output voltage of the chamfering circuit is gradually reduced to realize chamfering of the row scanning signal, a second voltage after chamfering is finally output, electric energy mainly comes and goes back in the first energy storage circuit and the second energy storage circuit, and the electric energy directly discharged to the ground is less, the current-limiting circuit has low power consumption, and the power consumption of the chamfering circuit is reduced.
Description
Technical Field
The invention belongs to the technical field of display panels, and particularly relates to a chamfering circuit, a driving device and a display device.
Background
In a Thin Film Transistor Liquid Crystal Display (TFT-LCD), scan lines are used to transmit row scan signals to TFTs to turn on the TFTs, and data lines are used to transmit data signals to pixel cells when the TFTs are turned on to charge the pixel cells, thereby controlling the Display of the pixel cells. The pixel cells respectively display colors R (Red), G (Green), and B (Blue).
In order to avoid abnormal display caused by a difference change of gray scale voltages due to instant switching of the row opening signal to the row closing signal, the row scanning signal is usually required to be chamfered.
In an implementation mode of the chamfering circuit, a line scanning signal is output through a switch tube, the input end and the output end of the switch tube are respectively connected with a switch tube grounded and are subjected to switching control through inputting control signals GVFOFF and GVON with opposite polarities, the output end is also connected with a capacitor in parallel, and the capacitor C discharges through the switch tube of the output end and a resistor at the front stage of the switch tube.
Since the charge of the capacitor C is directly discharged to the ground through the resistor, the resistor generates heat, resulting in an increase in power consumption.
Disclosure of Invention
The invention aims to provide a chamfering circuit, which aims to solve the problem of high power consumption of the traditional chamfering circuit.
A first aspect of an embodiment of the present invention provides a chamfering circuit, configured to output a line scanning signal to a gate line of a display panel, where the chamfering circuit includes a first switch circuit, a second switch circuit, a third switch circuit, a first energy storage circuit, a second energy storage circuit, and a current limiting circuit;
the first end of the first switch circuit and the first end of the second switch circuit are connected together to form a signal input end of the chamfering circuit and used for inputting a first voltage, the second end of the first switch circuit, the first end of the current limiting circuit and the first end of the second energy storage circuit are connected together to form a signal output end of the chamfering circuit and used for outputting a row scanning signal, the second end of the current limiting circuit is connected with the first end of the first energy storage circuit, the second end of the second switch circuit and the first end of the third switch circuit are connected together, and the second end of the third switch circuit and the second end of the second energy storage circuit are both grounded;
when the power is initially powered on, the first switch circuit and the second switch circuit are controlled to be switched on, the third switch circuit is controlled to be switched off, and the first voltage is output to the second energy storage circuit, charged and output to the signal output end of the chamfering circuit;
after the first preset duration, the first switch circuit and the second switch circuit are controlled to be turned off, the third switch circuit is controlled to be turned on, the second energy storage circuit charges the first energy storage circuit through the current limiting circuit and outputs a second voltage after the angle is cut through a signal output end of the angle cutting circuit, and the second voltage is a terminal voltage of the first energy storage circuit and the second energy storage circuit.
In one embodiment, after a second preset time period in which the signal output terminal of the chamfering circuit outputs the second voltage, the third switch circuit is controlled to be turned off and the second switch circuit is controlled to be turned on, the first energy storage circuit charges the second energy storage circuit through the current limiting circuit and outputs the first voltage through the signal output terminal of the chamfering circuit, and after a third preset time period, the first switch circuit is turned on and continuously outputs the first voltage.
In one embodiment, the chamfering circuit further comprises a one-way conduction circuit, an input end of the one-way conduction circuit is connected with the second end of the current limiting circuit, and an output end of the one-way conduction circuit is connected with the first end of the current limiting circuit;
after a second preset time length of a second voltage is output by the signal output end of the chamfering circuit, the third switch circuit is controlled to be turned off and the second switch circuit is controlled to be turned on, the current limiting circuit is short-circuited by the unidirectional conducting circuit, and the first energy storage circuit serves as the second energy storage circuit through the unidirectional conducting circuitCharging of electricityAnd the first voltage is output through a signal output end of the chamfering circuit.
In one embodiment, the unidirectional conducting circuit comprises a diode, and an anode and a cathode of the diode are an input end and an output end of the unidirectional conducting circuit respectively.
In one embodiment, the chamfering circuit further comprises a controller, and the controller is electrically connected with the first switch circuit, the second switch circuit and the third switch circuit respectively;
the controller is configured to control the first switch circuit, the second switch circuit, and the third switch circuit to be turned on or off according to a preset time period.
In one embodiment, the first energy storage circuit comprises a first energy storage capacitor, and the first end and the second end of the first energy storage capacitor are the first end and the second end of the first energy storage circuit respectively.
In one embodiment, the second energy storage circuit comprises a second energy storage capacitor, and the first end and the second end of the second energy storage capacitor are the first end and the second end of the second energy storage circuit, respectively.
In one embodiment, the first switching circuit includes a first electronic switching tube, the second switching circuit includes a second electronic switching tube, and the third switching circuit includes a third electronic switching tube.
A second aspect of the embodiments of the present invention provides a driving apparatus, including a timing controller, a source driving circuit, and a gate driving circuit, where the gate driving circuit includes the above-described chamfering circuit;
the time schedule controller is respectively connected with the source electrode driving circuit and the grid electrode driving circuit, the source electrode driving circuit is connected with a plurality of data lines of the display panel, and the chamfering circuit of the grid electrode driving circuit is connected with a plurality of grid lines of the display panel.
A third aspect of the embodiments of the present invention provides a display device, including a display panel and the driving device as described above, wherein the display panel is correspondingly connected to the driving device.
In the embodiment of the invention, a first switch circuit, a second switch circuit, a third switch circuit, a first energy storage circuit, a second energy storage circuit and a current limiting circuit are adopted, when power is output initially, the first switch circuit and the second switch circuit are switched on, the third switch circuit is switched off, the second energy storage circuit is charged, a chamfering circuit outputs a first voltage which is a row opening signal in a row scanning signal, after a first preset time length, the output of the row opening signal is finished, chamfering processing is carried out at the moment, the first switch circuit and the second switch circuit are switched off, the third switch circuit is switched on, the second energy storage circuit charges the first energy storage circuit through the current limiting circuit, in the charging process, the output voltage of the chamfering circuit is gradually reduced to realize the chamfering of the row scanning signal, a second voltage is finally output after chamfering, electric energy mainly returns between the first energy storage circuit and the second energy storage circuit, the electric energy directly discharged to the ground is less, the power consumption of the current limiting circuit is low, and the power consumption of the chamfering circuit is reduced.
Drawings
Fig. 1 is a schematic diagram of a first structure of a chamfering circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a second structure of the chamfering circuit according to the embodiment of the present invention;
fig. 3 is a schematic diagram of a third structure of a chamfering circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a driving device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only 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 one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
First embodiment
Fig. 1 is a schematic diagram of a first structure of a chamfering circuit according to an embodiment of the present invention, which only shows a part related to the embodiment for convenience of description, and the details are as follows:
a first aspect of the embodiments of the present invention provides a chamfering circuit 10, configured to output a line scanning signal to a gate line of a display panel 1.
In this embodiment, the chamfering circuit 10 includes a first switch circuit 11, a second switch circuit 12, a third switch circuit 13, a first energy storage circuit 14, a second energy storage circuit 15, and a current limiting circuit 16;
a first end of the first switch circuit 11 and a first end of the second switch circuit 12 are connected in common to form a signal input end VIN of the chamfering circuit 10 and used for inputting a first voltage, a second end of the first switch circuit 11, a first end of the current limiting circuit 16 and a first end of the second energy storage circuit 15 are connected in common to form a signal output end VOUT of the chamfering circuit 10 and used for outputting a row scanning signal, a second end of the current limiting circuit 16 is connected with a first end of the first energy storage circuit 14, a second end of the second switch circuit 12 and a first end of the third switch circuit 13 are connected in common, and a second end of the third switch circuit 13 and a second end of the second energy storage circuit 15 are both grounded;
when the power is initially powered on, the first switch circuit 11 and the second switch circuit 12 are controlled to be turned on, the third switch circuit 13 is controlled to be turned off, and the first voltage is output to the second energy storage circuit 15, charged and output to the signal output end VOUT of the chamfering circuit 10;
after the first preset time, the first switch circuit 11 and the second switch circuit 12 are controlled to be turned off, the third switch circuit 13 is controlled to be turned on, the second energy storage circuit 15 charges the first energy storage circuit 14 through the current limiting circuit 16 and outputs a second voltage after the angle is cut through the signal output end VOUT of the angle cutting circuit 10, and the second voltage is a terminal voltage of the first energy storage circuit 14 and the second energy storage circuit 15.
In this embodiment, the energy storage circuit is charged and discharged when the voltage difference exists between the two ends, and is not charged and discharged when the voltage between the two ends is equal, when the line scanning signal needs to be output, the chamfering circuit 10 is powered on and switched to a normal working state, at this time, the first switch circuit 11 and the second switch circuit 12 are both controlled to be turned on, the third switch circuit 13 is controlled to be turned off, at this time, the voltage of the signal output terminal VOUT of the chamfering circuit 10 is a first voltage, the first voltage is a line start signal of the line scanning signal and is output to the gate line of the display panel 1, so as to start the pixel units of the corresponding line of the display panel 1, since the terminal voltages of the first tank circuit 14 and the second tank circuit 15 are both the first voltage, the first tank circuit 14 does not store energy, the second tank circuit 15 stores energy, and the current limiting circuit 16 does not have current flowing, i.e., does not generate extra power consumption.
When the row start signal is output after the first preset time period, and the row start signal of the row scanning signal is needed to be chamfered, the first switch circuit 11 is controlled to be turned off in advance, then the second switch circuit 12 is controlled to be turned off, the third switch circuit 13 is controlled to be turned on, at this time, the voltage of the second end of the first energy storage circuit 14 is changed to be 0V, at this time, because the terminal voltage of the second energy storage circuit 15 is still the first voltage, the voltage difference exists between the two ends of the first energy storage circuit 14, the second energy storage circuit 15 starts to charge the first energy storage circuit 14, the first voltage is gradually reduced to realize chamfering, finally, the voltage of the first end of the first energy storage circuit 14 and the voltage of the first end of the second energy storage circuit 15 are equal and are both chamfered second voltages, the second voltage is output through the signal output end VOUT of the chamfering circuit 10 and is used as the row turn-off signal in the row scanning signal and forms the row scanning signal with the first voltage, the progressive scanning of the display panel 1 is realized, the current limiting circuit 16 consumes a part of electric energy in the charging and discharging processes of the first energy storage circuit 14 and the second energy storage circuit 15, and the main part of electric energy is in the first energy storage circuit 14 and the second energy storage circuit 15, so that the power consumption of the current limiting circuit 16 in the process is reduced.
The first switch circuit 11, the second switch circuit 12, and the third switch circuit 13 may be self-contained time sequence controlled switch circuits, each switch circuit is respectively turned on or off according to a set time length, or respectively is a switch circuit with a controlled on-off function, such as an electronic switch tube, a relay, and the like, each switch circuit is respectively connected with another control circuit to realize on-off control, and the control circuit may be a time sequence control circuit or a controller.
Each energy storage circuit can adopt structures such as an energy storage capacitor and an energy storage battery, and the current limiting circuit 16 can be formed by one or more resistance elements and is arranged correspondingly according to requirements.
In the embodiment of the invention, by adopting the first switch circuit 11, the second switch circuit 12, the third switch circuit 13, the first energy storage circuit 14, the second energy storage circuit 15 and the current limiting circuit 16, when the power-on output is started, the first switch circuit 11 and the second switch circuit 12 are switched on, the third switch circuit 13 is switched off, the second energy storage circuit 15 is charged, the angle cutting circuit 10 outputs the first voltage, the first voltage is a row opening signal in a row scanning signal, after the first preset time length, the output of the row opening signal is ended, the angle cutting processing is carried out at the moment, the first switch circuit 11 and the second switch circuit 12 are switched off, the third switch circuit 13 is switched on, the second energy storage circuit 15 charges the first energy storage circuit through the current limiting circuit 16, in the charging process, the output voltage of the angle cutting circuit 10 is gradually reduced to realize the angle cutting of the row scanning signal, the second voltage is finally output after the angle cutting, the electric energy mainly goes and goes back in the first energy storage circuit 14 and forth with the second energy storage circuit 15, the electric energy directly discharged to the ground is less, the power consumption of the current limiting circuit 16 is low, and the power consumption of the chamfering circuit 10 is reduced.
Second embodiment
In an embodiment, the chamfering circuit 10 further includes a controller, and the controller is electrically connected to the first switch circuit 11, the second switch circuit 12, and the third switch circuit 13 respectively;
and the controller is used for controlling the first switch circuit 11, the second switch circuit 12 and the third switch circuit 13 to be correspondingly switched on or switched off according to a preset time period.
In this embodiment, the independent controller is used for performing switching control to reduce the work of the timing controller, and the controller outputs different control signals to the first switch circuit 11, the second switch circuit 12, and the third switch circuit 13 according to a preset time period after power-on, so that the chamfering circuit outputs a line scanning signal meeting the requirement.
EXAMPLE III
The present embodiment is embodied on the basis of the second embodiment, and as shown in fig. 3, the first switch circuit 11, the second switch circuit 12, and the third switch circuit 13 are respectively a first electronic switch Q1, a second electronic switch Q2, and a third electronic switch Q3.
The first energy storage circuit 14 comprises a first energy storage capacitor C1, the first end and the second end of the first energy storage capacitor C1 are respectively the first end and the second end of the first energy storage circuit 14, the second energy storage circuit 15 comprises a second energy storage capacitor C2, and the first end and the second end of the second energy storage capacitor C2 are respectively the first end and the second end of the second energy storage circuit 15.
The current limiting circuit 16 includes a first resistor R1, and two ends of the first resistor R1 are two ends of the current limiting circuit 16, respectively.
When the circuit is initially powered on and operated, the first electronic switching tube Q1 and the second electronic switching tube Q2 are both controlled to be turned on under the control of the controller, the third switching circuit 13 is controlled to be turned off under the control of the controller, at this time, the voltage of the signal output terminal VOUT of the chamfering circuit 10 is a first voltage, the first voltage is a row-on signal of a row scanning signal and is output to a gate line of the display panel 1, so that pixel cells of a corresponding row of the display panel 1 are turned on, because the terminal voltages of the first energy-storage capacitor C1 and the second energy-storage capacitor C2 are both the first voltage, the first energy-storage capacitor C1 does not store energy, the second energy-storage capacitor C2 stores energy, and the first resistor R1 does not have current flow, that is, no additional power consumption is generated.
When the row start signal is output after the first preset time period is finished and the row start signal of the row scanning signal is required to be chamfered, the first electronic switch tube Q1 is controlled to be turned off in advance, then the second electronic switch tube Q2 is controlled to be turned off, and the third electronic switch tube Q3 is controlled to be turned on, at this time, the voltage of the second end of the first energy storage capacitor C1 is changed into 0V, because the terminal voltage of the second energy storage capacitor C2 is still the first voltage, the voltage difference exists between the two ends of the first energy storage capacitor C1, the second energy storage capacitor C2 starts to charge the first energy storage capacitor C1, the first voltage is gradually reduced, the chamfering is realized, and finally, the voltage of the first end of the first energy storage capacitor C1 is equal to the voltage of the first end of the second energy storage capacitor C2, and both are the chamfered second voltage.
For example, the first voltage is 30V, the first energy-storing capacitor C1 is 1C1 is 1 μ F, and the second energy-storing capacitor C2 is 0.2 μ F, and then the second energy-storing capacitor C2 charges the first energy-storing capacitor C1, i.e. 30V × 0.2 μ F/(1 μ F +0.2 μ F) ═ 5V, so the voltages of the first energy-storing capacitor C1 and the second energy-storing capacitor C2 are equal, and the second voltage is 5V.
The second voltage is output through the signal output terminal VOUT of the chamfering circuit 10, and is used as a line shutdown signal in the line scanning signal, and forms the line scanning signal with the first voltage, so that line-by-line scanning of the display panel 1 is realized, a part of electric energy is consumed in the charging and discharging processes of the first energy storage capacitor C1 and the second energy storage capacitor C2, and a main part of electric energy is in the first energy storage capacitor C1 and the second energy storage capacitor C2, so that the power consumption of the first resistor R1 in the process is reduced.
The lower limit of the cutting angle, i.e., the magnitude of the second voltage, is determined by the accommodation of the first energy-storage capacitor C1 and the second energy-storage capacitor C2, the magnitudes of the first energy-storage capacitor C1 and the second energy-storage capacitor C2 can be selected correspondingly according to the magnitude of the second voltage, and the first resistor R1 is used for controlling the discharging speed.
Through the chamfering circuit 10, the energy utilization rate is high, the loss energy of the first resistor R1 is low, the temperature is low, and the energy-saving advantage is achieved.
Example four
In this embodiment, optimization is performed on the basis of the first embodiment, in order to realize normal switching between the row on signal and the row off signal of the chamfering circuit 10, and meanwhile, to avoid increase of energy consumption caused by slow discharge of the electric energy stored in the energy storage circuit, when the next stage is ready to enter the working state of outputting the row on signal normally, that is, after the second preset time period in which the second voltage is output by the signal output terminal VOUT of the chamfering circuit 10, the third switch circuit 13 is controlled to be turned off and the second switch circuit 12 is controlled to be turned on, the first energy storage circuit 14 charges the second energy storage circuit 15 through the current limiting circuit 16 and outputs the first voltage through the signal output terminal VOUT of the chamfering circuit 10, and after the third preset time period, the first switch circuit 11 is turned on and continuously outputs the first voltage.
Taking the above circuits and parameters as examples, when preparing to enter the working state of normally outputting the row on signal, the third electronic switch Q3 is controlled to turn off, the second electronic switch Q2 is controlled to turn on, at this time, the voltage at the second end of the first energy storage capacitor C1 suddenly changes to 30V, the voltage at the first end of the first energy storage capacitor C1 suddenly changes to 35V, the first energy storage capacitor C1 charges the second energy storage capacitor C2, the terminal voltage at the first end of the two energy storage capacitors is (35V 1 μ F + 5V 0.2 μ F)/(1 μ F +0.2 μ F) ═ 30V, the chamfering circuit 10 outputs the first voltage signal, then the first electronic switch tube Q1 is controlled to be switched on continuously, the electric energy stored in the first energy storage capacitor C1 and the second energy storage capacitor C2 circulates repeatedly, the electric energy discharged to the ground is reduced, the energy utilization rate is improved, and meanwhile, the energy consumption of the first resistor R1 is reduced, so that the purpose of energy conservation is achieved.
EXAMPLE five
In this embodiment, optimization is performed on the basis of the first embodiment, and in order to ensure that the row off signal is quickly switched to the row on signal and to shorten the change time between the two signals, as shown in fig. 2, in one embodiment, the chamfering circuit 10 further includes a unidirectional conducting circuit 17, an input end of the unidirectional conducting circuit 17 is connected to the second end of the current limiting circuit 16, and an output end of the unidirectional conducting circuit 17 is connected to the first end of the current limiting circuit 16;
after a second preset time period when the signal output terminal VOUT of the chamfering circuit 10 outputs the second voltage, the third switch circuit 13 is controlled to be turned off and the second switch circuit 12 is controlled to be turned on, and the first energy storage circuit 14 charges the second energy storage circuit 15 quickly through the unidirectional conducting circuit 17 and outputs the first voltage through the signal output terminal VOUT of the chamfering circuit 10.
In this embodiment, the unidirectional conducting circuit 17 short-circuits the current limiting circuit 16 when the first tank circuit 14 charges the second tank circuit 15, so as to realize fast charging, thereby enabling the row shutdown signal (the second voltage) to be fast switched to the row start signal (the first voltage).
In an alternative embodiment, as shown in fig. 3, the unidirectional conducting circuit 17 includes a diode D1, and an anode and a cathode of the diode D1 are an input end and an output end of the unidirectional conducting circuit 17, respectively.
EXAMPLE six
As shown in fig. 4, an embodiment of the present invention further provides a driving apparatus 2, including a timing controller 300, a source driving circuit 200, and a gate driving circuit 100, where the gate driving circuit 100 includes the above chamfering circuit 10, and a specific structure of the chamfering circuit 10 refers to the above embodiments, and since the driving apparatus 2 adopts all technical solutions of all the above embodiments, at least all beneficial effects brought by the technical solutions of the above embodiments are achieved, and details are not repeated here. The timing controller 300 is respectively connected to the source driving circuit 200 and the gate driving circuit 100, the source driving circuit 200 is connected to a plurality of data lines of the display panel 1, and the chamfering circuit 10 of the gate driving circuit 100 is connected to a plurality of gate lines of the display panel 1.
EXAMPLE seven
A third aspect of the embodiment of the present invention provides a display device, as shown in fig. 5, including a backlight 3, a display panel 1, and the driving device 2, where the specific structure of the driving device 2 refers to the foregoing embodiments, and since the display device adopts all technical solutions of all the foregoing embodiments, the display device at least has all beneficial effects brought by the technical solutions of the foregoing embodiments, and details are not repeated here, where the display panel 1 is correspondingly connected to the driving device 2.
In this embodiment, the driving device 2 performs line-by-line scanning lighting on the display panel 1 to realize normal driving, and cooperates with the backlight 3 to display corresponding image information.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A kind of angle cutting circuit, is used for outputting the line scanning signal to the gate line of the display panel, characterized by that, the said angle cutting circuit includes the first switching circuit, the second switching circuit, the third switching circuit, the first energy storage circuit, the second energy storage circuit and current-limiting circuit;
the first end of the first switch circuit and the first end of the second switch circuit are connected together to form a signal input end of the chamfering circuit and used for inputting a first voltage, the second end of the first switch circuit, the first end of the current limiting circuit and the first end of the second energy storage circuit are connected together to form a signal output end of the chamfering circuit and used for outputting a row scanning signal, the second end of the current limiting circuit is connected with the first end of the first energy storage circuit, the second end of the second switch circuit and the first end of the third switch circuit are connected together, and the second end of the third switch circuit and the second end of the second energy storage circuit are both grounded;
when the power is initially powered on, the first switch circuit and the second switch circuit are controlled to be switched on, the third switch circuit is controlled to be switched off, and the first voltage is output to the second energy storage circuit, charged and output to the signal output end of the chamfering circuit;
after the first preset duration, the first switch circuit and the second switch circuit are controlled to be turned off, the third switch circuit is controlled to be turned on, the second energy storage circuit charges the first energy storage circuit through the current limiting circuit and outputs a second voltage after the angle is cut through a signal output end of the angle cutting circuit, and the second voltage is a terminal voltage of the first energy storage circuit and the second energy storage circuit.
2. The chamfering circuit of claim 1, wherein the third switch circuit is controlled to turn off and the second switch circuit is controlled to turn on after a second preset time period in which a second voltage is output at the signal output terminal of the chamfering circuit, the first tank circuit charges the second tank circuit through the current limiting circuit and outputs the first voltage through the signal output terminal of the chamfering circuit, and the first switch circuit is turned on and continuously outputs the first voltage after a third preset time period.
3. The chamfering circuit according to claim 2, further comprising a unidirectional conducting circuit, an input terminal of the unidirectional conducting circuit being connected to the second terminal of the current limiting circuit, an output terminal of the unidirectional conducting circuit being connected to the first terminal of the current limiting circuit;
after a second preset time length that a signal output end of the chamfering circuit outputs a second voltage, the third switch circuit is controlled to be turned off and the second switch circuit is controlled to be turned on, the one-way conduction circuit is used for short-circuiting the current limiting circuit, and the first energy storage circuit charges the second energy storage circuit through the one-way conduction circuit and outputs the first voltage through the signal output end of the chamfering circuit.
4. The corner cutting circuit according to claim 3, wherein the unidirectional conducting circuit comprises a diode, and an anode and a cathode of the diode are an input end and an output end of the unidirectional conducting circuit respectively.
5. The chamfering circuit according to claim 1 or 2, further comprising a controller electrically connected to the first switch circuit, the second switch circuit, and the third switch circuit, respectively;
the controller is configured to control the first switch circuit, the second switch circuit, and the third switch circuit to be turned on or off according to a preset time period.
6. The chamfering circuit of claim 1, wherein the first tank circuit comprises a first tank capacitor, the first and second ends of the first tank capacitor being the first and second ends of the first tank circuit, respectively.
7. The chamfering circuit of claim 1, wherein the second tank circuit comprises a second tank capacitor, the first and second ends of the second tank capacitor being the first and second ends of the second tank circuit, respectively.
8. The corner cutting circuit of claim 1, wherein the first switching circuit comprises a first electronic switching tube, the second switching circuit comprises a second electronic switching tube, and the third switching circuit comprises a third electronic switching tube.
9. A driving device, comprising a timing controller, a source driving circuit and a gate driving circuit, wherein the gate driving circuit comprises the chamfering circuit according to any one of claims 1 to 8;
the time schedule controller is respectively connected with the source electrode driving circuit and the grid electrode driving circuit, the source electrode driving circuit is connected with a plurality of data lines of the display panel, and the chamfering circuit of the grid electrode driving circuit is connected with a plurality of grid lines of the display panel.
10. A display device comprising a backlight, a display panel and the driving device according to claim 9, wherein the display panel is correspondingly connected to the driving device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110709468.8A CN113506546B (en) | 2021-06-25 | 2021-06-25 | Chamfering circuit, driving device and display device |
Applications Claiming Priority (1)
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017185437A1 (en) * | 2016-04-26 | 2017-11-02 | 深圳市华星光电技术有限公司 | Chamfer regulating circuit and liquid crystal display having chamfer regulating circuit |
| CN209000515U (en) * | 2018-10-24 | 2019-06-18 | 惠科股份有限公司 | Top rake circuit and display device |
| CN209312419U (en) * | 2018-12-19 | 2019-08-27 | 惠科股份有限公司 | Top rake circuit and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9135879B2 (en) * | 2012-11-23 | 2015-09-15 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Chamfer circuit of driving system for LCD panel, uniformity regulating system and method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017185437A1 (en) * | 2016-04-26 | 2017-11-02 | 深圳市华星光电技术有限公司 | Chamfer regulating circuit and liquid crystal display having chamfer regulating circuit |
| CN209000515U (en) * | 2018-10-24 | 2019-06-18 | 惠科股份有限公司 | Top rake circuit and display device |
| CN209312419U (en) * | 2018-12-19 | 2019-08-27 | 惠科股份有限公司 | Top rake circuit and display device |
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