CN109767743B

CN109767743B - Driving circuit and display device thereof

Info

Publication number: CN109767743B
Application number: CN201910236146.9A
Authority: CN
Inventors: 王铮
Original assignee: InfoVision Optoelectronics Kunshan Co Ltd
Current assignee: InfoVision Optoelectronics Kunshan Co Ltd
Priority date: 2019-03-27
Filing date: 2019-03-27
Publication date: 2021-11-23
Anticipated expiration: 2039-03-27
Also published as: CN109767743A

Abstract

The invention discloses a driving circuit and a display device thereof. The driving circuit comprises a driving module, a driving module and a control module, wherein the driving module is used for driving the display device based on the power supply voltage and according to the data signal; the detection module generates an indication signal according to a data signal, each working period of the data signal comprises a data transmission stage and a blanking stage, and the data signal provides display data in the data transmission stage; the power supply module is connected with the detection module to receive the indication signal, and the indication signal is in an effective state and provides power supply voltage for the driving module; the indication signal is in an active state during the data transmission phase. The driving circuit is provided with the first control unit, so that the driving module works under normal load and does not work under low load, and the driving circuit outputs power supply voltage along with the change of the load, thereby reducing the power consumption of the display device and prolonging the service life of the display device. The driving circuit is provided with a second control unit, and when the picture is in a blanking area and the refreshing frequency is reduced, the voltage generating unit stops working.

Description

Driving circuit and display device thereof

Technical Field

The invention relates to the technical field of display, in particular to a driving circuit and a display device thereof.

Background

Liquid Crystal Display (LCD) devices have many advantages such as being light and thin, and saving energy, and are widely used in high-definition electronic devices.

The liquid crystal display device comprises a driving module, a grid driver and a detection module. The driving module and the gate driver respectively provide data signals and scanning signals for a plurality of pixel units of the display panel according to the time sequence control signals output by the detection module, and electric fields formed between different data signals and common electrode voltage enable liquid crystal deflection angles to be different, so that the brightness of displayed pictures is different.

Fig. 1 shows a driving circuit of a display device in the prior art, and the driving circuit 100 includes a detection module 110, a power supply module 120, and a driving module 130. The detection module 110 is used to analyze all gray scale values of the data signal output by the system. The power supply module 120 determines an analog power supply voltage AVDD according to the gray level value of the data signal, and the driving module 130 receives the power supply voltage AVDD and provides a driving signal according to the data signal to drive the display device, so that the display device displays normally. Wherein the driving module is, for example, a source driver.

However, even in the low refresh rate operation mode or when the data signal is in the blanking period, the driving circuit 100 still provides the corresponding power supply voltage to the driving module 130, so that the operational amplifier unit inside the driving module 130 is in the normal operation state for a long time, and further the conventional display device has the problems of high power consumption, short service life, and the like.

Disclosure of Invention

In view of the foregoing, it is an object of the present invention to provide a driving circuit and a display device thereof, which can control the output power supply voltage to the driving module according to the change of the load, thereby reducing the power consumption of the display device and prolonging the service life of the display device.

According to an aspect of the present invention, a driving circuit is provided, which includes a driving module for providing a driving signal according to a data signal to drive a display device when a supply voltage is in an active state; the detection module generates an indication signal according to the data signal, each working period of the data signal comprises a data transmission phase and a blanking phase, and the data signal provides display data in the data transmission phase; the power supply module is connected with the detection module to receive the indication signal and provide the power supply voltage for the driving module when the indication signal is in an effective state; the indication signal is in an active state in the data transmission phase, and the indication signal is in an inactive state in the blanking phase.

Optionally, the power supply module includes a voltage generation unit that generates the power supply voltage based on an enable signal, and a first control unit that is turned on and outputs the power supply voltage when the indication signal is in an active state, and is turned off and does not provide the power supply voltage when the indication signal is in an inactive state.

Optionally, the first control unit comprises: the control end of the first switch tube is connected with and receives the indication signal, the first path end of the first switch tube is grounded, and the second path end of the first switch tube is connected with and receives the power supply voltage through a first resistor; and the control end of the second switch tube is connected with the second path end of the first switch tube, the first path end of the second switch tube is connected with and receives the power supply voltage, and the second path end of the second switch tube is connected with the driving module.

Optionally, when the active state of the indication signal is characterized by a high level, the first switching tube and the second switching tube have different conductivity types; when the effective state of the indication signal is low level, the first switch tube and the second switch tube are the same in conductivity type.

Optionally, the driving circuit further comprises: the second control unit controls the enabling signal to be turned on or off according to a starting signal and the indicating signal, when the enabling signal is turned on, the voltage generating unit generates the power supply voltage, when the enabling signal is turned off, the voltage generating unit does not generate the power supply voltage, when the working cycle of the data signal detected by the detection module is greater than a preset threshold value, the detection module generates the starting signal, the starting signal is used for reducing the picture refreshing frequency of the display device, when the indicating signal is in the effective state, the second control unit is controlled to be turned on by the enabling signal, and the voltage generating unit generates the power supply voltage; when the indication signal is in the invalid state and the starting signal is generated, the second control unit turns off the enabling signal, and the voltage generation unit does not generate the power supply voltage; when the indication signal is in the invalid state and the starting signal is not generated, the second control unit conducts the enabling signal, and the voltage generation unit generates the power supply voltage.

Optionally, the second control unit comprises: the first input end of the OR gate is connected with and receives the starting signal, the second input end of the OR gate is connected with and receives the indicating signal, and the output end of the OR gate outputs a logic result; the anode of the voltage stabilizing diode is grounded, and the cathode of the voltage stabilizing diode is connected with the output end of the OR gate through a second resistor; and the control end of the third switching tube is connected with the cathode of the voltage stabilizing diode, the first path end of the third switching tube is connected with the output end of the OR gate, and the second path end of the third switching tube is connected with and receives the enabling signal.

Optionally, the second control unit comprises: a first input end of the rectifier tube is connected with and receives the starting signal, a second input end of the rectifier tube is connected with and receives the indicating signal, and an output end of the rectifier tube outputs a rectifying signal; a control end of the fourth switching tube is connected with an output end of the rectifying tube, a first path end of the fourth switching tube is grounded, and a second path end of the fourth switching tube is connected with and receives the enable signal through a third resistor; and the control end of the fifth switching tube is connected with the second path end of the fourth switching tube, the first path end of the fifth switching tube is connected with and receives the enabling signal, and the second path end of the fifth switching tube is connected with the voltage generating unit.

Optionally, the fourth switching tube and the fifth switching tube have different conductivity types.

Optionally, the rectifier tube comprises a double-diode cascode fast recovery diode.

According to another aspect of the present invention, there is provided a display device including the driving circuit provided above.

The invention provides a driving circuit and a display device thereof, wherein the driving circuit is provided with a first control unit at the output end of a voltage generation unit, so that a power supply module does not provide power supply voltage for the driving module when a data signal is in a blanking stage, and provides power supply voltage for the driving module when the data signal is in a data transmission stage. The driving circuit can output power supply voltage along with the change of the load, so that the power consumption of the display device is reduced, and the service life of the display device is prolonged. The driving module is, for example, a source driver.

Preferably, the driving circuit further provides a second control unit at an input terminal of the voltage generating unit. When the data signal is detected to be in a blanking stage and when the seamless dynamic refresh switching function of the driving circuit is started, the second control unit works and turns off the enabling signal, so that the rear-stage driving module cannot receive the power supply voltage and stops working; when the data signal is detected to be in a blanking stage and when the seamless dynamic refresh switching function is not started by the driving circuit, the second control unit works to conduct the enabling signal, and then the first control unit works and controls the power supply voltage to be switched off, so that the rear-stage driving module cannot receive the power supply voltage and stops working. When the data signal is detected to be in a data transmission stage, the second control unit controls the conduction enabling signal no matter whether the seamless dynamic refresh switching function is started or not, and then the first control unit works and controls the conduction of the power supply voltage and provides the power supply voltage for the rear-stage driving module so that the display device works normally. The driving circuit controls the working state of the driving module along with the change of the load, thereby not only reducing the power consumption of the display device, but also prolonging the service life of the display device.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram of a driving circuit of a display device according to the prior art;

fig. 2 is a schematic diagram showing a configuration of a driving circuit provided according to a first embodiment of the present invention;

FIG. 3 is a timing diagram of a driving circuit provided according to a first embodiment of the present invention;

fig. 4 shows a circuit schematic diagram of a first control unit in the driving circuit provided according to the first embodiment of the present invention;

fig. 5 is a schematic diagram showing a structure of a driving circuit provided according to a second embodiment of the present invention;

FIG. 6 is a timing diagram of a driving circuit provided according to a second embodiment of the present invention;

fig. 7 is a circuit diagram of a second control unit in the driving circuit according to the second embodiment of the present invention;

fig. 8 shows a circuit schematic diagram of another second control unit in the driving circuit provided in accordance with the second embodiment of the present invention;

fig. 9 is a flow chart illustrating a driving method according to a third embodiment of the present invention;

fig. 10 is a flow chart illustrating a driving method according to a fourth embodiment of the present invention.

Detailed Description

Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.

Fig. 2 shows a schematic structural diagram of a driving circuit according to a first embodiment of the present invention, and as shown in fig. 2, the driving circuit 200 includes a detection module 210, a power supply module voltage generating unit, and a driving module 230, where the power supply module includes a voltage generating unit 220 and a first control unit 240.

The detection module 210 analyzes and detects the DATA signal DATA processed by the timing controller to obtain the indication signal SYNC, each duty cycle of the DATA signal DATA includes a DATA transmission phase and a blanking phase, and the DATA signal DATA provides display DATA during the DATA transmission phase. Wherein the indication signal SYNC is used to characterize whether the DATA signal DATA is in the blanking phase or in the DATA transmission phase. Wherein the detection module 210 may be integrated in a timing controller provided in the system, for example.

The power supply module is connected to the detection module 210 to receive the indication signal SYNC and provide a power supply voltage to the driving module 230 when the indication signal SYNC is active. The indication signal SYNC is active during the data transmission phase and inactive during the blanking phase.

The voltage generating unit 220 is, for example, a power chip, connected to the detecting module 210 to receive the DATA signal DATA, and controls the voltage generating unit 220 to generate a power supply voltage AVDD _ IN corresponding to the DATA signal DATA based on the enable signal EN _ IN, so as to supply power to the driving module 230 of the display device.

The first control unit 240 is connected to the output terminal of the voltage generating unit 220 to receive the supply voltage AVDD _ IN, and controls to turn on or off the supply voltage AVDD _ IN according to the received indication signal SYNC. Specifically, when the indication signal SYNC represents that the data signal is IN the blanking phase, the first control unit 240 turns off the supply voltage AVDD-IN according to the indication signal SYNC, and the driving circuit 200 does not provide the supply voltage AVDD _ OUT to the driving module 230; when the indication signal SYNC represents that the data signal is IN the data transmission phase, the first control unit 240 turns on the supply voltage AVDD-IN according to the indication signal SYNC, and the driving circuit 200 provides the supply voltage AVDD _ OUT to the driving module 230.

The driving module 230 is connected to the power supply module to receive the output power supply voltage, and is connected to the timing controller (not shown) to receive the DATA signal DATA, so as to provide a driving signal to drive the display device based on the power supply voltage and according to the DATA signal DATA, wherein the driving module 230 is, for example, a source driver.

The driving circuit 200 is provided with a first control unit at the output end of the voltage generating unit, so that the driving circuit does not provide a power supply voltage to the driving module when the data signal is in the blanking phase, and provides a power supply voltage to the driving module when the data signal is in the data transmission phase. The driving circuit 200 outputs the power supply voltage when the data signal is in a data transmission stage along with the change of the load, and does not provide the power supply voltage when the data signal is in a blanking stage, so that the power consumption of the display device is reduced, and the service life of the display device is prolonged.

Fig. 3 is a timing diagram illustrating a driving circuit according to a first embodiment of the invention, and as shown in fig. 3, when reading a DATA bit of the DATA signal DATA, the indication signal SYNC is characterized as a high level, for example, and the DATA signal DATA is in a DATA transmission phase to provide display DATA, and the first control unit of the driving circuit controls the on-state supply voltage according to the indication signal SYNC and provides the supply voltage AVDD _ OUT to the driving module at the rear stage. When reading the blank bit of the DATA signal DATA, the indication signal SYNC is characterized as low level, for example, and the DATA signal DATA is in a blanking period, for example, no display DATA is provided, and the first control unit of the driving circuit controls to turn off the supply voltage according to the indication signal SYNC and does not provide the supply voltage AVDD _ OUT to the driving module of the subsequent stage.

In this embodiment, when the invalid state of the indication signal SYNC is low, the DATA signal DATA is in a blanking stage, and when the valid state of the indication signal SYNC is high, the DATA signal DATA is in a DATA transmission stage. However, the present invention is not limited to this, i.e. when the indication signal SYNC is high, it may indicate that the DATA signal DATA is in the blanking phase, and when the indication signal SYNC is low, it may indicate that the DATA signal DATA is in the DATA transmission phase.

Fig. 4 is a schematic circuit diagram of a first control unit in a driving circuit provided according to a first embodiment of the present invention, and as shown in fig. 4, is a specific implementation manner of the first control unit in the first embodiment. The first control unit 240 receives the indication signal SYNC output by the detection module 210 and the supply voltage AVDD _ IN output by the voltage generation unit 220, and turns on or off the supply voltage according to the control of the indication signal SYNC, and turns on and supplies the supply voltage when the indication signal SYNC is IN an active state, and turns off and does not supply the supply voltage when the indication signal SYNC is IN an inactive state.

In this embodiment, when the indication signal SYNC is at a low level, the DATA signal DATA is in a blanking stage, and when the indication signal SYNC is at a high level, the DATA signal DATA is in a DATA transmission stage. The first control unit 240 includes a first switch Q1 and a second switch Q2, wherein the first switch Q1 and the second switch Q2 have different conductive types, specifically, the first switch Q1 is an N-type transistor, and the second switch Q2 is a P-type transistor in this embodiment. The control terminal of the first switch Q1 is connected to receive the indication signal SYNC through a resistor R7, for example, the first path terminal of the first switch Q1 is grounded, and the second path terminal of the first switch Q1 is connected to receive the supply voltage AVDD _ IN through a resistor R1. The control terminal of the second switch tube Q2 is connected to the second path terminal of the first switch tube Q1, the first path terminal of the second switch tube Q2 is connected to receive the supply voltage AVDD _ IN, and the second path terminal of the second switch tube Q2 is connected to the driving module to provide the supply voltage AVDD _ OUT.

When the indication signal SYNC is at a low level, the DATA signal DATA is IN a blanking period, the first switch tube Q1 and the second switch tube Q2 are both turned off, the supply voltage AVDD _ IN is turned off, and the driving circuit does not provide the supply voltage AVDD _ OUT to the driving module. When the indication signal SYNC is at a high level, the DATA signal DATA is at a DATA transmission stage to provide display DATA, the first switch tube Q1 and the second switch tube Q2 are both turned on, the supply voltage AVDD _ IN is turned on, and the driving circuit provides the supply voltage AVDD _ OUT to the driving module. The difference between the supply voltage AVDD _ OUT and the supply voltage AVDD _ IN is the voltage drop value of the second switch tube Q2.

It should be noted that, in this embodiment, the conductivity types of the two switching tubes of the first control unit 240 are limited to that the first switching tube Q1 is an N-type triode and the second switching tube Q2 is a P-type triode, but the conductivity types of the two switching tubes can still be implemented when they are interchanged. In the embodiment, the indication signal SYNC is defined as representing that the DATA signal DATA is in the blanking stage when the level of the indication signal SYNC is low, however, when the indication signal SYNC is in the blanking stage when the level of the indication signal SYNC is high and representing that the DATA signal DATA is in the DATA transmission stage when the level of the indication signal SYNC is low, the present invention can be implemented by only making the conductive types of the first switch tube Q1 and the second switch tube Q2 consistent.

And the two switching tubes provided in this embodiment may be transistors, field effect tubes, and the like.

When the display device having the driving circuit has a Seamless Dynamic Refresh Rate Switching (SDRRS) function, the present invention provides another embodiment to better reduce the power consumption of the display device. The Seamless Dynamic Refresh Switching (SDRRS) function is that when the display device is in a low load state, the frame Refresh Rate (frame Rate) of the display device can be switched from a high Refresh Rate to a low Refresh Rate, so as to save power.

Fig. 5 shows a schematic structural diagram of a driving circuit according to a second embodiment of the present invention, and as shown in fig. 5, the driving circuit 300 includes a detection module 310, a power supply module and a driving module 330, wherein the power supply module includes a voltage generation unit 320, a first control unit 340 and a second control unit 350.

The detection module 310 analyzes and detects the DATA signal DATA processed by the timing controller to obtain the indication signal SYNC, each duty cycle of the DATA signal DATA includes a DATA transmission phase and a blanking phase, and the DATA signal DATA provides display DATA during the DATA transmission phase. Wherein the indication signal SYNC is used to characterize whether the DATA signal DATA is in the blanking phase or in the DATA transmission phase. And when the duty cycle of the DATA signal DATA detected by the detection module 310 is greater than the preset threshold, the detection module 310 generates a START signal START to enable the system to START the SDRRS function to reduce the refresh frequency of the display and synchronously output the display to the second control unit 350, where the START signal START is used to reduce the refresh frequency of the display. Wherein the detection module 310 may be integrated in a timing controller provided in the system, for example.

The voltage generating unit 320 is, for example, a power chip, connected to the detecting module 310 to receive the DATA signal DATA, and controls the voltage generating unit 320 to generate a power supply voltage AVDD _ IN corresponding to the DATA signal DATA based on the enable signal EN _ OUT for supplying power to the driving module 330 of the display device.

The first control unit 340 is connected to the output terminal of the voltage generating unit 320 to receive the supply voltage AVDD _ IN, and controls to turn on or off the supply voltage AVDD _ IN according to the received indication signal SYNC, and turns on and provides the supply voltage when the indication signal SYNC is IN an active state, and turns off and does not provide the supply voltage when the indication signal SYNC is IN an inactive state. Specifically, when the indication signal SYNC represents that the data signal is IN the blanking phase, the first control unit 340 turns off the supply voltage AVDD-IN according to the indication signal SYNC, and the driving circuit 300 does not provide the supply voltage AVDD _ OUT to the driving module 330; when the indication signal SYNC represents that the data signal is IN the data transmission phase, the first control unit 340 turns on the supply voltage AVDD-IN according to the indication signal SYNC, and the driving circuit 300 provides the supply voltage AVDD _ OUT to the driving module 330.

The second control unit 350 is connected to an input terminal of the voltage generation unit 320 to receive the enable signal EN _ IN, and controls to turn on or off the enable signal EN _ IN according to the received indication signal SYNC and the START signal START, and when the enable signal EN _ IN is turned on, the voltage generation unit 320 generates the supply voltage AVDD-IN, and when the enable signal EN _ IN is turned off, the voltage generation unit 320 does not generate the supply voltage AVDD-IN.

Specifically, when the indication signal SYNC represents that the DATA signal DATA is IN the DATA transmission phase, the second control unit 350 turns on the enable signal EN _ IN, the second control unit 350 provides the enable signal EN _ OUT to the voltage generating unit 320, the voltage generating unit 320 operates normally and provides the supply voltage AVDD-IN, and at this time, the first control unit 340 turns on the supply voltage AVDD-IN according to the indication signal SYNC, so that the driving circuit supplies power to the driving module 330.

When the indication signal SYNC represents that the DATA signal DATA is IN a blanking period and when the start signal SYART represents that the refresh frequency of the display frame is reduced, the second control unit 350 turns off the enable signal EN _ IN, the second control unit 350 does not provide the enable signal EN _ OUT to the voltage generating unit 320, the voltage generating unit 320 does not operate and does not provide the supply voltage AVDD-IN, and at this time, the first control unit 340 does not input the supply voltage AVDD-IN, so that the driving circuit does not supply power to the driving module 330.

When the indication signal SYNC represents that the DATA signal DATA is IN a blanking period and when the start signal SYART represents that the refresh frequency of the display frame is not reduced, the second control unit 350 turns on the enable signal EN _ IN, the second control unit 350 provides the enable signal EN _ OUT to the voltage generating unit 320, the voltage generating unit 320 operates to provide the supply voltage AVDD-IN, and at this time, the first control unit 340 turns off the supply voltage AVDD-IN according to the indication signal SYNC, so that the driving circuit does not supply power to the driving module 330.

The driving module 330 is connected to the power supply module to receive the output power supply voltage, and connected to the timing controller (not shown) to receive the DATA signal DATA, so as to provide a driving signal to drive the display device based on the power supply voltage and according to the DATA signal DATA, wherein the driving module 330 is, for example, a source driver.

It should be noted that, when the duty cycle of the data signal is greater than the preset threshold, the characterization display pictures are the same or similar, which indicates that the load is low at this time, the display picture displays a static picture, and the detection module 310 generates the start signal to start the SDRRS function, so as to reduce the refresh frequency of the display picture.

The driving circuit of the embodiment is provided with a first control unit at the output end of the voltage generating unit and a second control unit at the input end of the voltage generating unit. When the DATA signal DATA is detected to be in a blanking stage and when the driving circuit starts the SDRRS function, the second control unit works and controls the voltage generation unit to stop working, so that the rear-stage driving module cannot receive the power supply voltage and stops working; when the DATA signal DATA is detected to be in a blanking stage and the driving circuit does not start the SDRRS function, the second control unit works to control the voltage generation unit to continue working, and then the first control unit works and controls the power supply voltage to be switched off, so that the rear-stage driving module cannot receive the power supply voltage and stops working. When the DATA signal DATA is detected to be in a DATA transmission stage, no matter whether the SDRRS function is started or not, the second control unit controls the control voltage generation unit to continue working, and then the first control unit works and controls the power supply voltage to be conducted and supplies power to the rear-stage driving module so that the display device works normally. The driving circuit controls the working states of the voltage generating unit and the driving module along with the change of the load, so that the power consumption of the display device is reduced, and the service life of the display device is prolonged.

Fig. 6 shows a timing diagram of a driving circuit according to a second embodiment of the present invention, as shown in fig. 6, when reading a DATA bit of a DATA signal DATA, an indication signal SYNC is characterized as a high level, for example, when the DATA signal DATA is in a DATA transmission phase, an SDRRS function is activated or not activated, a second control unit of the driving circuit controls a turn-on enable signal, and a first control unit controls a turn-on supply voltage according to the indication signal SYNC and supplies the supply voltage AVDD _ OUT to at least a driving module of a subsequent stage. When the blank bit of the DATA signal DATA is read, the indication signal SYNC is characterized as low level, for example, the DATA signal DATA is IN a blanking stage, and when the start signal is low level and represents that the SDRRS function is started, the second control unit of the driving circuit turns off the enable signal, the voltage generation unit stops working, the power supply voltage AVDD _ IN is not output, and the driving module does not work; when the DATA signal DATA is IN a blanking stage and when the starting signal is a high level and represents that the SDRRS function is not started, the second control unit of the driving circuit turns on the enable signal, the voltage generation unit normally works to provide the supply voltage AVDD _ IN, and at this time, the first control unit controls to turn off the supply voltage AVDD _ IN according to the indication signal SYNC, so that the driving module does not work.

In this embodiment, when the indication signal SYNC is at a low level, the DATA signal DATA is in a blanking stage, when the indication signal SYNC is at a high level, the DATA signal DATA is in a DATA transmission stage, and when the START signal START is at a low level, the SDRRS function is activated, and when the START signal START is at a high level, the SDRRS function is not activated. However, the implementation of the present invention is not limited to this, that is, the indication signal SYNC is high level may indicate that the DATA signal DATA is in the blanking phase, the indication signal SYNC is low level indicates that the DATA signal DATA is in the DATA transmission phase, and the START signal START may indicate that the SDRRS function is started when the indication signal SYNC is high level and indicate that the SDRRS function is not started when the START signal START is low level.

Fig. 7 is a schematic circuit diagram of a second control unit in a driving circuit according to a second embodiment of the present invention, and as shown in fig. 7, is a specific implementation manner of the second control unit in the second embodiment. The second control unit 450 receives the indication signal SYNC and the START signal START output by the detection module, and controls the enable signal EN-OUT to be turned on or off according to the indication signal SYNC and the START signal START.

In this embodiment, when the indication signal SYNC is at a low level, the DATA signal DATA is in a blanking stage, and when the indication signal SYNC is at a high level, the DATA signal DATA is in a DATA transmission stage. The START signal START is low indicating that the SDRRS function is activated, and the START signal START is high indicating that the SDRRS function is not activated.

The second control unit 450 includes an or gate U1, a third switch Q3, and a voltage regulator D1. A first input terminal of the or gate U1 is connected to the detection module and receives the START signal START, a second input terminal of the or gate U1 is connected to the detection module and receives the indication signal SYNC, and an output terminal of the or gate U1 outputs a logic result. The anode of the zener diode D1 is grounded, and the cathode of the zener diode D1 is connected to the output terminal of the or gate U1 through the second resistor R2. The third switching tube Q3 is, for example, a P-type triode, a control terminal of the third switching tube Q3 is connected to the cathode of the zener diode D1, a first path terminal of the third switching tube Q3 is connected to the output terminal of the or gate U1, and a second path terminal of the third switching tube Q3 is connected to the enable signal EN-OUT and connected to the voltage generating unit to output the enable signal EN-OUT to the voltage generating unit.

When the indication signal SYNC is at a high level, indicating that the DATA signal DATA is in a DATA transmission phase, and the START signal START is at a high level or a low level, the or gate U1 outputs a high level, the third switching tube Q3 is turned off, and the enable signal EN _ OUT is provided to the voltage generating unit. The voltage generating unit of the subsequent stage provides the supply voltage AVDD _ IN, the first control unit turns on the supply voltage AVDD _ IN according to the operation principle described IN the first embodiment, and the driving circuit provides the supply voltage AVDD _ OUT to the driving module.

When the START signal START is high when the indication signal SYNC is low and the characterization DATA signal DATA is in the blanking phase, the characterization SDRRS function is not activated. The or gate U1 outputs a high level, the third switching tube Q3 is turned off, and the enable signal EN _ OUT is provided to the voltage generating unit. The voltage generating unit of the subsequent stage provides the supply voltage AVDD _ IN, the first control unit turns off the supply voltage AVDD _ IN according to the operation principle described IN the first embodiment, and the driving circuit does not provide the supply voltage AVDD _ OUT to the driving module.

When the START signal START is low when the indication signal SYNC is low and the characterization DATA signal DATA is in the blanking phase, the characterization SDRRS function is activated. The or gate U1 outputs a low level, the third switching tube Q3 is turned on, and the enable signal EN _ OUT is not provided to the voltage generating unit. The voltage generating unit of the rear stage does not work and does not provide the supply voltage AVDD _ IN, and then the driving circuit does not provide the supply voltage AVDD _ OUT to the driving module. In this state, the first control unit does not operate.

And the switching tube provided in this embodiment may be a transistor, a field effect transistor, or the like.

Fig. 8 is a schematic circuit diagram of another second control unit in the driving circuit according to the second embodiment of the present invention, and as shown in fig. 8, is another specific implementation manner of the second control unit in the second embodiment. The second control unit 550 receives the indication signal SYNC and the START signal START output by the detection module, and controls the enable signal to be turned on or off according to the indication signal SYNC and the START signal START.

In this embodiment, when the indication signal SYNC is at a low level, the DATA signal DATA is in a blanking stage, and when the indication signal SYNC is at a high level, the DATA signal DATA is in a DATA transmission stage. And the starting signal START is low level to indicate that the SDRRS function is started, and the starting signal START is high level to indicate that the SDRRS function is not started.

The second control unit 550 includes a rectifier U2, a fourth switch Q4, and a fifth switch Q5. The first input end of the rectifier tube U2 is connected with the detection module and receives the START signal START, the second input end of the rectifier tube U2 is connected with the detection module and receives the indication signal SYNC, and the output end of the rectifier tube U2 outputs the rectification signal. The fourth switch Q4 and the fifth switch Q5 have different conductive types, specifically, in this embodiment, the fourth switch Q4 is an N-type transistor, and the fifth switch Q5 is a P-type transistor. The control terminal of the fourth switch Q4 is connected to the output terminal of the rectifier U2 through a resistor R9, for example, the first path terminal of the fourth switch Q4 is grounded, and the second path terminal of the fourth switch Q4 is connected to and receives the enable signal EN _ IN through a third resistor R3. The control terminal of the fifth switch tube Q5 is connected to the second path terminal of the fourth switch tube Q4, the first path terminal of the fifth switch tube Q5 is connected to receive the enable signal EN _ IN, and the second path terminal of the fifth switch tube Q5 is connected to the voltage generating unit to provide the enable signal EN _ OUT.

When the indication signal SYNC is at a high level and the DATA signal DATA is in a DATA transmission phase, and the START signal START is at a high level or a low level, the rectifier U2 outputs a high level, the fourth switch Q4 is turned on, the fifth switch Q5 is turned on, and the enable signal EN _ OUT is provided to the voltage generating unit. The voltage generating unit of the subsequent stage provides the supply voltage AVDD _ IN, the first control unit turns on the supply voltage AVDD _ IN according to the operation principle described IN the first embodiment, and the driving circuit provides the supply voltage AVDD _ OUT to the driving module.

When the START signal START is high when the indication signal SYNC is low and the characterization DATA signal DATA is in the blanking phase, the characterization SDRRS function is not activated. The rectifying tube U2 outputs a high level, the fourth switching tube Q4 is turned on, the fifth switching tube Q5 is turned on, and the enable signal EN _ OUT is provided to the voltage generating unit. The voltage generating unit of the subsequent stage provides the supply voltage AVDD _ IN, the first control unit turns off the supply voltage AVDD _ IN according to the operation principle described IN the first embodiment, and the driving circuit does not provide the supply voltage AVDD _ OUT to the driving module.

When the START signal START is low when the indication signal SYNC is low and the characterization DATA signal DATA is in the blanking phase, the characterization SDRRS function is activated. The rectifying tube U2 outputs a low level, the fourth switching tube Q4 is turned off, the fifth switching tube Q5 is turned off, and the enable signal EN _ OUT is not provided to the voltage generating unit. The voltage generating unit of the rear stage does not work and does not provide the supply voltage AVDD _ IN, and then the driving circuit does not provide the supply voltage AVDD _ OUT to the driving module. In this state, the first control unit does not operate. The enable signal EN _ OUT and the enable signal EN _ IN differ by a voltage drop value of the fifth switching tube Q5. And the switching tube provided in this embodiment may be a transistor, a field effect transistor, or the like. The rectifier is, for example, a double-diode common-cathode type fast recovery diode.

It should be noted that, in this embodiment, the conductivity types of the two switching tubes of the second control unit 550 are limited to that the fourth switching tube Q4 is an N-type triode and the fifth switching tube Q5 is a P-type triode, but the conductivity types of the two switching tubes can still be implemented when they are interchanged. In this embodiment, the indication signal SYNC is defined as indicating that the DATA signal DATA is in a blanking stage when the level of the indication signal SYNC is low, indicating that the DATA signal DATA is in a DATA transmission stage when the level of the indication signal SYNC is high, and indicating that the SDRRS function is activated when the START signal START is low, and indicating that the SDRRS function is not activated when the START signal START is high. However, when the DATA signal DATA is in the blanking phase when the level of the indication signal SYNC is high, the DATA signal DATA is in the DATA transmission phase when the level of the indication signal SYNC is low, the SDRRS function is activated when the START signal START is high, and the SDRRS function is not activated when the START signal START is low, the rectifier is only required to be replaced by the common-anode fast recovery diode, and the fourth switch Q4 and the fifth switch Q5 are replaced by the triodes of the same conductive type, so that the present invention can be implemented.

Fig. 9 is a flow chart illustrating a driving method according to a third embodiment of the present invention, and as shown in fig. 9, the provided power supply method can be performed on the driving circuit provided in the second embodiment. The method comprises the following steps:

step S10: and outputting the data signal. The time schedule controller outputs a DATA signal DATA to the detection module, and provides display DATA when the DATA signal is in a DATA transmission stage, wherein the display DATA is used for representing a display picture.

Step S20: and judging whether the data signal is in a blanking stage. The detection module detects the DATA signal DATA and outputs an indication signal SYNC that may indicate that the DATA signal DATA is in a blanking phase or a DATA transmission phase.

When the DATA signal DATA is in the blanking phase, step S30 is performed: and judging whether the frame refreshing frequency is reduced or not. When the detection module detects that the working period of the data signal is greater than the preset threshold, the START signal START is generated to reduce the refresh frequency of the display frame, so that the step is to judge whether the detection module generates the START signal START.

When the refresh frequency decreases, step S50 is performed: the second control unit controls the voltage generation unit to stop supplying power. That is, when the DATA signal DATA is in the blanking period and the detection module outputs the START signal START, the second control unit controls the voltage generation unit to stop supplying power, and then the first control unit, the voltage generation unit and the rear-stage driving module stop working.

When the refresh frequency is not decreased, step S60 is performed: the first control unit turns off the supply voltage. That is, when the DATA signal DATA is in a blanking stage and the detection module does not output the START signal START, the second control unit works and turns on the enable signal, the voltage generation unit works to provide the power supply voltage, and then the first control unit turns off the power supply voltage according to the control of the indication signal SYNC, and then the rear-stage driving module stops working.

When the data signal is in the data transmission phase, step S40 is executed: the first control unit conducts the supply voltage. That is, when the DATA signal DATA is in the DATA transmission phase, the voltage generating unit provides the power supply voltage, and the first control unit controls to turn on the power supply voltage according to the indication signal SYNC. Step S70 is then executed: the driving module generates a driving signal to drive the display device. And then the rear-stage driving module works normally to generate a driving signal so that the display device can display normally.

When a power supply method is provided and executed on the driving circuit provided in the first embodiment, the method steps are as follows as shown in fig. 10:

step S100: and outputting the data signal. The time schedule controller outputs a DATA signal DATA to the detection module, and the display DATA is used for representing a display picture.

Step S200: and judging whether the data signal is in a blanking stage. The detection module detects the DATA signal DATA and outputs an indication signal SYNC that may indicate that the DATA signal DATA is in a blanking phase or a DATA transmission phase.

When the DATA signal DATA is in the blanking phase, step S300 is performed: the first control unit turns off the supply voltage. Namely, when the DATA signal DATA is in the DATA transmission stage, the voltage generating unit provides the power supply voltage, the first control unit turns off the power supply voltage according to the indication signal SYNC, and the rear-stage driving module stops working.

When the DATA signal DATA is in the DATA transmission phase, step S400 is performed: the first control unit conducts the supply voltage. That is, when the DATA signal DATA is in the DATA transmission phase, the voltage generating unit provides the power supply voltage, and the first control unit controls to turn on the power supply voltage according to the indication signal SYNC.

Then, step S500: the driving module generates a driving signal to drive the display device. And then the rear-stage driving module works normally, so that the display device can display normally.

The invention also provides a display device which comprises the driving circuit.

While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A driving circuit, comprising a driving module for providing a driving signal based on a supply voltage and according to a data signal to drive a display device, further comprising:

the detection module generates an indication signal according to the data signal, each working period of the data signal comprises a data transmission stage and a blanking stage, the data signal provides display data in the data transmission stage, and a starting signal is generated when the working period of the data signal detected by the detection module is greater than a preset threshold value; and

the power supply module is connected with the detection module to receive the indication signal and provide the power supply voltage for the driving module when the indication signal is in an effective state;

wherein the indication signal is active during the data transmission phase and the indication signal is inactive during the blanking phase,

the power supply module includes:

the voltage generation unit is used for controlling and generating the power supply voltage based on an enable signal;

a first control unit that is turned on and supplies the supply voltage when the indication signal is in an active state, and is turned off and does not supply the supply voltage when the indication signal is in an inactive state, an

A second control unit for controlling the enabling signal to be turned on or off according to a start signal and the indication signal, wherein the voltage generating unit generates the power supply voltage when the enabling signal is turned on, the voltage generating unit does not generate the power supply voltage when the enabling signal is turned off, the start signal is used for reducing the picture refreshing frequency of the display device,

when the indication signal is in the effective state, controlling the second control unit to conduct the enabling signal; when the indication signal is in the invalid state and the starting signal is generated, controlling the second control unit to turn off the enabling signal; and when the indication signal is in the invalid state and the starting signal is not generated, controlling the second control unit to conduct the enabling signal.

2. The drive circuit according to claim 1, wherein the first control unit includes:

the control end of the first switch tube is connected with and receives the indication signal, the first path end of the first switch tube is grounded, and the second path end of the first switch tube is connected with and receives the power supply voltage through a first resistor; and

the control end of the second switch tube is connected with the second path end of the first switch tube, the first path end of the second switch tube is connected with and receives the power supply voltage, and the second path end of the second switch tube is connected with the driving module.

3. The driving circuit of claim 2, wherein when the active state of the indication signal is characterized by a high level, the first switching tube and the second switching tube have different conductivity types; when the effective state of the indication signal is low level, the first switch tube and the second switch tube are the same in conductivity type.

4. The drive circuit according to claim 1, wherein the second control unit includes:

the first input end of the OR gate is connected with and receives the starting signal, the second input end of the OR gate is connected with and receives the indicating signal, and the output end of the OR gate outputs a logic result;

the anode of the voltage stabilizing diode is grounded, and the cathode of the voltage stabilizing diode is connected with the output end of the OR gate through a second resistor;

and the control end of the third switching tube is connected with the cathode of the voltage stabilizing diode, the first path end of the third switching tube is connected with the output end of the OR gate, and the second path end of the third switching tube is connected with and receives the enabling signal.

5. The drive circuit according to claim 1, wherein the second control unit includes:

a first input end of the rectifier tube is connected with and receives the starting signal, a second input end of the rectifier tube is connected with and receives the indicating signal, and an output end of the rectifier tube outputs a rectifying signal;

a control end of the fourth switching tube is connected with an output end of the rectifying tube, a first path end of the fourth switching tube is grounded, and a second path end of the fourth switching tube is connected with and receives the enable signal through a third resistor; and

and the control end of the fifth switching tube is connected with the second path end of the fourth switching tube, the first path end of the fifth switching tube is connected with and receives the enabling signal, and the second path end of the fifth switching tube is connected with the voltage generating unit.

6. The driving circuit as claimed in claim 5, wherein the fourth switching tube and the fifth switching tube have different conductivity types.

7. The driving circuit as claimed in claim 5, wherein the rectifying tube comprises a double-diode-cascode fast recovery diode.

8. A display device comprising the driver circuit according to any one of claims 1 to 7.