CN116386558A - Driving method and driving circuit of display device and display device - Google Patents

Driving method and driving circuit of display device and display device Download PDF

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Publication number
CN116386558A
CN116386558A CN202310322831.XA CN202310322831A CN116386558A CN 116386558 A CN116386558 A CN 116386558A CN 202310322831 A CN202310322831 A CN 202310322831A CN 116386558 A CN116386558 A CN 116386558A
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Prior art keywords
frame
refresh rate
row
next frame
signal
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Chinese (zh)
Inventor
卢昭阳
康报虹
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HKC Co Ltd
Changsha HKC Optoelectronics Co Ltd
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HKC Co Ltd
Changsha HKC Optoelectronics Co Ltd
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Priority to CN202310322831.XA priority Critical patent/CN116386558A/en
Publication of CN116386558A publication Critical patent/CN116386558A/en
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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
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3266—Details of drivers for scan electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The application discloses a driving method, a driving circuit and a display device of the display device, wherein the driving method comprises the following steps: the refresh rates of the current frame and the next frame of the display device are obtained; comparing the refresh rate of the current frame with the refresh rate of the next frame, if the refresh rate of the current frame is greater than the refresh rate of the next frame, generating corresponding scanning signals according to refresh rate parameters of the current frame in a first time period of the next frame, controlling the thin film transistors on each row of scanning lines to be turned on line by line, and turning off all the thin film transistors corresponding to all the scanning lines in a second time period of the next frame; and if the refresh rate of the current frame is smaller than that of the next frame, generating a corresponding scanning signal according to the refresh rate parameter of the next frame in one frame time of the next frame, and controlling the thin film transistors on each row of scanning lines to be turned on row by row. The method and the device control the opening time of the scanning line by controlling the driving signal on the scanning line, so that the switching of the refresh frequency is realized, the low-frequency display is supported, and the power consumption is reduced.

Description

Driving method and driving circuit of display device and display device
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a driving method and a driving circuit for a display device, and a display device.
Background
GOA technology (Gate On Array), namely a Gate drive circuit, is manufactured On an Array substrate, so that the Gate drive circuit can replace an external integrated circuit board (Integrated Circuit, IC) to finish driving of horizontal scanning lines.
As the user's taste requirements for the display are higher, the display refresh frequency is higher and the power consumption is greater. For the application scene of the display electronic contest, for example, the electronic contest needs high refresh frequency of 240HZ,120HZ and the like, the video needs 60HZ, the webpage is browsed, the mail is browsed, and the frequency is lower, for example, 30HZ. Still pictures, such as wallpaper, can be seen at less than 10 HZ. Because of the existing display technology, the frequency is fixed and very low frequencies cannot be supported in hardware. If the scanning circuit can be driven by circuit control, the switching of each application scene can be realized, the power consumption can be greatly reduced, and the energy cost can be saved, so that the development of a circuit for realizing the reduction of the power consumption and supporting the low frequency is a problem to be solved by display technicians.
Disclosure of Invention
An object of the present application is to provide a driving method of a display device, a driving circuit, and a display device, which realize a change in refresh frequency by control of a scanning circuit to reduce power consumption while supporting low-frequency display.
The application discloses a driving method of a display device, the driving method includes the steps of:
the refresh rates of the current frame and the next frame of the display device are obtained; and
comparing the refresh rate of the current frame with the refresh rate of the next frame, if the refresh rate of the current frame is greater than the refresh rate of the next frame, starting a first display mode to drive the display device for display, and if the refresh rate of the current frame is less than the refresh rate of the next frame, starting a second display mode to drive the display device for display;
the specific steps of the first display mode include:
generating corresponding scanning signals according to refresh rate parameters of the current frame in a first time period of the next frame, controlling the thin film transistors on each row of scanning lines to be turned on row by row, and turning off all the thin film transistors corresponding to all the scanning lines in a second time period of the next frame;
the specific steps of the second display mode include:
generating a corresponding scanning signal according to the refresh rate parameter of the next frame in one frame time of the next frame, and controlling the thin film transistors on each row of scanning lines to be opened row by row;
the duration of the first time period is equal to one frame duration corresponding to the current frame refresh rate, the duration of the second time period is n times of the duration of the first time period, and n is a positive number.
Optionally, in the first period of the next frame, generating a corresponding scanning signal according to the refresh rate parameter of the current frame, and controlling the thin film transistors on each row of scanning lines to be turned on row by row; in the second period of the next frame, the step of turning off all the thin film transistors corresponding to all the scanning lines includes:
in a first time period of a next frame, inputting a frame start signal of a current frame refresh rate, and controlling the thin film transistors on each row of scanning lines to be turned on row by row; in the second period of the next frame, the frequency control circuit is turned on, and a low-level signal is input to the scanning lines of all rows so as to turn off all the thin film transistors corresponding to all the scanning lines.
Optionally, in the first period of the next frame, generating a corresponding scanning signal according to the refresh rate parameter of the current frame, and controlling the thin film transistors on each row of scanning lines to be turned on row by row; in the second period of the next frame, the step of turning off all the thin film transistors corresponding to all the scanning lines includes:
in a first time period of a next frame, inputting a frame start signal of a current frame refresh rate, and controlling the thin film transistors on each row of scanning lines to be turned on row by row; and in a second time period of the next frame, turning off a frame start signal of the current frame refresh rate, and inputting scanning signals of scanning lines of all rows into a low level to turn off all thin film transistors corresponding to all the scanning lines.
Optionally, the first period is before, the second period is after the first period and is continuously set, and in the first display mode, a sum of values of the first period and the second period of the next frame is equal to a frame time of the current frame.
Optionally, the current frame refresh rate is F1, the next frame refresh rate is F2, the duration of one frame corresponding to the current frame refresh rate is T1, and the duration of one frame corresponding to the next frame refresh rate is T2; the first time period is t1, and the second time period is t2;
wherein t1=t1, t2=t1+t2, f1/f2=t1+t2/T1.
Optionally, in the first period of the next frame, generating a corresponding scanning signal according to the refresh rate parameter of the current frame, controlling the thin film transistors on each row of scanning lines to be turned on row by row, and in the second period of the next frame, turning off all the thin film transistors corresponding to all the scanning lines, including:
generating a value of a second time period of the next frame according to the ratio of the refresh rates of the current frame and the next frame and the value of the first time period;
wherein, t2= (F1/F2-1) ×t1.
Optionally, in the first period of the next frame, generating a corresponding scanning signal according to the refresh rate parameter of the current frame, controlling the thin film transistors on each row of scanning lines to be turned on row by row, and in the second period of the next frame, turning off all the thin film transistors corresponding to all the scanning lines, including:
a common line corresponding to the display device is controlled and input to a first common level in the first time period, and a common line corresponding to the display device is controlled and input to a second common level in the second time period;
wherein the voltage value of the second common level is smaller than the voltage value of the first common level.
The application also provides a driving circuit of the display device, which drives the display device by using the driving method, wherein the driving circuit comprises a grid driving circuit and a frequency control circuit, and the grid driving circuit generates a grid driving signal to a scanning line corresponding to the display device according to the current refresh rate; the frequency control circuit is arranged between the scanning line and the grid driving circuit; the frequency control circuit changes the gate driving signal output by the gate driving unit to control the opening time of the scanning line in each frame, and generates a gate driving signal corresponding to a new refresh rate to the display device for refresh display.
Optionally, the gate driving circuit includes a plurality of gate driving units, each gate driving unit corresponds to a frequency control circuit, the frequency control circuit includes a gate signal input module, a gate signal pull-down module and a frequency pull-down module, a control end and an input end of the gate signal input module are connected to output ends of the gate driving units corresponding to the previous row of scanning lines, and an output end of the gate signal is connected to an input end of the scanning lines; the control end of the grid signal pull-down module is connected with the output end of the grid driving unit corresponding to the current line scanning line, the input end of the grid signal pull-down module is connected with the first level signal input end of the grid driving unit, and the output end of the grid signal pull-down module is connected with the output end of the grid signal input module; the control end of the frequency pull-down module is connected with the output end of the frequency control voltage, the input end of the frequency pull-down module is connected with the first level signal input end of the grid driving unit, and the output end of the frequency pull-down module is connected with the output end of the grid signal input module; when the frequency control circuit is a second level signal after the scanning of the previous frame is finished and the next frame is scanned, the frequency pull-down module controls all gate signals to be low-level and input the low-level signals to all scanning lines.
The application also discloses a display device, the display device includes the drive circuit, time sequence control module and refresh rate acquisition comparison module as above arbitrary, time sequence control module output clock signal and frame start signal extremely drive circuit's grid drive circuit, refresh acquisition comparison module with drive circuit's frequency control circuit is connected, control frequency control circuit work is in order to change the grid drive signal of grid drive unit output, control the scanning line is at the on-time of every frame, generates the grid drive signal that new refresh rate corresponds and carries out the refreshing display to the display device.
Compared with the scheme that the refresh frequency is changed through hardware, the novel driving circuit is provided, when the refresh frequency is switched, the switching of the refresh rate of the display device is realized mainly through changing the grid driving signal input to the scanning lines, if the refresh rate of the current frame is larger than that of the next frame, in the first time period of the next frame, corresponding scanning signals or grid driving signals are generated according to the refresh rate parameters of the current frame, the thin film transistors on each row of scanning lines are controlled to be turned on row by row, and in the second time period of the next frame, all the thin film transistors corresponding to all the scanning lines are turned off; if the refresh rate of the current frame is smaller than that of the next frame, generating a corresponding scanning signal according to the refresh rate parameter of the next frame in one frame time of the next frame, and controlling the thin film transistors on each row of scanning lines to be turned on row by row; the switching of the refresh frequency is realized by controlling the opening time of the scanning line through controlling the driving signal on the scanning line, thereby realizing the refresh of lower frequency, reducing the power consumption and saving the energy cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive faculty for a person skilled in the art. In the drawings:
fig. 1 is a schematic flow chart of a driving method of a display device according to a first embodiment of the present application;
FIG. 2 is a schematic diagram of a refresh rate frequency switching waveform of a first embodiment of the present application;
FIG. 3 is a schematic flow chart of a driving method according to a second embodiment of the present application;
FIG. 4 is a schematic diagram of a refresh rate frequency switching waveform and a common voltage waveform of a third embodiment of the present application;
fig. 5 is a schematic structural diagram of a driving circuit of a fourth embodiment of the present application;
fig. 6 is a schematic structural diagram of a driving circuit of a fifth embodiment of the present application;
fig. 7 is a schematic structural diagram of a driving circuit of a sixth embodiment of the present application;
FIG. 8 is a graph of a 240hz switching 120hz frequency waveform of the present application;
FIG. 9 is a schematic diagram of a 240hz switching 60hz frequency waveform of the present application;
FIG. 10 is a schematic diagram of a 240hz switching 240hz frequency waveform of the present application;
fig. 11 is a schematic structural view of a display device of a seventh embodiment of the present application.
100, a display device; 110. a scanning line; 200. a driving circuit; 210. a gate driving circuit; 211. a gate driving unit; 220. a frequency control circuit; 221. a gate signal input module; 222. a gate signal pull-down module; 223. a frequency pull-down module; 300. a timing control module; 400. and the refresh rate acquisition comparison module.
Detailed Description
It should be understood that the terminology, specific structural and functional details disclosed herein are merely representative for purposes of describing particular embodiments, but that the application may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or implicitly indicating the number of technical features indicated. Thus, unless otherwise indicated, features defining "first", "second" may include one or more such features either explicitly or implicitly; the meaning of "plurality" is two or more. The terms "comprises," "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more other features, integers, steps, operations, elements, components, and/or groups thereof may be present or added.
In addition, terms of the azimuth or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., are described based on the azimuth or relative positional relationship shown in the drawings, are merely for convenience of description of the present application, and do not indicate that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application.
Furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
The present application is described in detail below with reference to the attached drawings and alternative embodiments.
As shown in fig. 1, as a first embodiment of the present application, there is disclosed a driving method of a display device, the driving method including the steps of:
s1: the refresh rates of the current frame and the next frame of the display device are obtained; and
s2: comparing the refresh rate of the current frame with the refresh rate of the next frame, if the refresh rate of the current frame is greater than the refresh rate of the next frame, starting a first display mode to drive the display device for display, and if the refresh rate of the current frame is less than the refresh rate of the next frame, starting a second display mode to drive the display device for display;
the specific steps of the first display mode include:
v1: generating corresponding scanning signals according to refresh rate parameters of the current frame in a first time period of the next frame, controlling the thin film transistors on each row of scanning lines to be turned on row by row, and turning off all the thin film transistors corresponding to all the scanning lines in a second time period of the next frame;
the specific steps of the second display mode include:
w1: generating a corresponding scanning signal according to the refresh rate parameter of the next frame in one frame time of the next frame, and controlling the thin film transistors on each row of scanning lines to be opened row by row;
the duration of the first time period is equal to one frame duration corresponding to the current frame refresh rate, the duration of the second time period is n times of the duration of the first time period, n is a positive number, and the duration of the second time period may be an integer multiple of the duration of the first time period or not.
In this embodiment, different display modes are adopted to perform driving display through comparison of refresh rates of the front frame and the rear frame, if the refresh rate of the current frame is greater than the refresh rate of the next frame, corresponding scanning signals are generated according to refresh rate parameters of the current frame in a first time period of the next frame, thin film transistors on each row of scanning lines are controlled to be turned on row by row, and all thin film transistors corresponding to all scanning lines are turned off in a second time period of the next frame; if the refresh rate of the current frame is smaller than that of the next frame, generating a corresponding scanning signal according to the refresh rate parameter of the next frame in one frame time of the next frame, and controlling the thin film transistors on each row of scanning lines to be turned on row by row; when the high refresh rate changes to the low refresh rate, the first time period of the low refresh rate still adopts the grid driving signal corresponding to the high refresh rate to drive, and the second time period does not input the grid driving signal generated by the current refresh rate to the scanning line, or the scanning line signals are all pulled down, the grid driving signal of the current frame refresh rate is essentially adopted to drive, but the grid driving signal is only input once in two frame time corresponding to the current frame refresh rate, the thin film transistor on the scanning line is only turned on once, so that the scanning is only carried out once in two frame time corresponding to the actual display result, the time is doubled, the refresh rate is reduced by half, namely, the turn-on time of the scanning line is controlled by controlling the driving signal on the scanning line, so that the switching of the refresh frequency is realized, the low-frequency display is supported, and the power consumption is reduced; and compared with the scheme that the pulse width of the grid driving signal is different by changing the clock signal, the change of the implementation is simpler and more convenient.
Further, the switching is mainly illustrated with the high refresh rate changing to the low refresh rate, and the step V1 includes:
in a first time period of a next frame, inputting a frame start signal of a current frame refresh rate, and controlling the thin film transistors on each row of scanning lines to be turned on row by row; in the second period of the next frame, the frequency control circuit is turned on, and a low-level signal is input to the scanning lines of all rows so as to turn off all the thin film transistors corresponding to all the scanning lines.
It should be noted that, the waveforms of the gate driving signal and the scanning signal in the present embodiment are identical and can be understood as the same signal; the scanning signal corresponding to the current frame refresh rate corresponding to the gate driving signal is the gate driving signal corresponding to the next frame refresh.
Referring to fig. 2, the present frame is 240hz, and the next frame is 120hz, and the gate driving signal is input to the scan line by controlling the frame start to turn off, so that when the refresh rate of the next frame is driven and displayed, the frame start signal of each frame corresponding to the refresh rate of the present frame is input once for two frames, and the gate driving signal corresponding to the refresh rate of the present frame is input once for two frames, so that the period of the gate driving signal of the next frame can be calculated to be twice as long as that of the present frame, and the refresh rate of the next frame is reduced by half.
The first period is before, the second period is after the first period and is continuously set, and in the first display mode, the sum of the values of the first period and the second period of the next frame is equal to one frame time of the current frame.
The switching of other refresh rates can be defined by adopting the following corresponding formulas to control the actual input duration of the corresponding scanning signals or the opening duration of the thin film transistors corresponding to the scanning lines; the current frame refresh rate is F1, the next frame refresh rate is F2, the one-frame duration corresponding to the current frame refresh rate is T1, and the one-frame duration corresponding to the next frame refresh rate is T2; the first time period is t1, and the second time period is t2;
wherein t1=t1, t2=t1+t2, f1/f2=t1+t2/T1.
And in a first time period of a next frame, generating a corresponding scanning signal according to the refresh rate parameter of the current frame, controlling the thin film transistors on each row of scanning lines to be opened row by row, and in a second time period of the next frame, turning off all the thin film transistors corresponding to all the scanning lines, wherein the steps comprise:
generating a value of a second time period of the next frame according to the ratio of the refresh rates of the current frame and the next frame and the value of the first time period;
wherein, t2= (F1/F2-1) ×t1.
In addition, it should be noted that, when the refresh rate is switched from the low refresh rate to the high refresh rate, a corresponding scan signal is generated according to the refresh rate parameter of the next frame in a frame time of the next frame, the thin film transistors on each row of scan lines are controlled to be turned on line by line, the gate drive signal generated by the refresh rate of the current frame is used as the next frame and is used once in the frame time of the next frame, if the refresh rate of the current frame is 120hz, the refresh rate of the next frame is 240hz, the frame time of the current frame is equivalent to two frame times of the next frame, and the gate drive signal generated based on the refresh rate of the current frame is only driven and displayed in the first period of the current frame, and if the refresh rate of the next frame is desired, the gate drive signal generated by the refresh rate parameter of the current frame is also input to the thin film transistors on the scan lines in the second period of time, so that the scan lines are turned on to charge the pixels.
As shown in fig. 3, as a second embodiment of the present application, unlike the first embodiment described above, the driving method includes the steps of:
x1: acquiring the highest refresh rate of the display device and the refresh rate of the next frame; and
x2: comparing the highest refresh rate with the refresh rate of the next frame, if the highest refresh rate is larger than the refresh rate of the next frame, generating corresponding scanning signals according to the highest refresh rate parameter in a first time period of the next frame, controlling the thin film transistors on each row of scanning lines to be turned on row by row, and turning off all the thin film transistors corresponding to all the scanning lines in a second time period of the next frame; and if the highest refresh rate is equal to the refresh rate of the next frame, generating a corresponding scanning signal according to the highest frame refresh rate parameter in one frame time of the next frame, and controlling the thin film transistors on each row of scanning lines to be turned on row by row.
Comparing the refresh rate of the next frame with the highest refresh rate in the display device, namely, taking the highest refresh rate as a reference, changing other refresh rates by a grid driving signal of the highest refresh rate, and generating corresponding scanning signals according to the highest refresh rate parameters in a first time period of the next frame when the refresh rate is smaller than the highest refresh rate, controlling the thin film transistors on each row of scanning lines to be turned on row by row, and turning off all the thin film transistors corresponding to all the scanning lines in a second time period of the next frame; if the highest refresh rate is equal to the refresh rate of the next frame, generating a corresponding scanning signal according to the highest frame refresh rate parameter in one frame time of the next frame, and controlling the thin film transistors on each row of scanning lines to be turned on row by row, wherein the value of the second time period may be 1 to 10 times or even higher than the value of the first time period, depending on the multiple difference of the highest refresh rate and the refresh rate of the next frame, the improved driving circuit can be used regardless of the refresh rate of the next frame.
As a third embodiment of the present application, further defining and improving the above embodiment, the step V1 includes:
a common line corresponding to the display device is controlled and input to a first common level in the first time period, and a common line corresponding to the display device is controlled and input to a second common level in the second time period;
wherein the voltage value of the second common level is smaller than the voltage value of the first common level.
Referring to fig. 4, considering that when the next frame refresh rate is used to drive the display, what is actually used is the gate driving signal corresponding to the previous frame refresh rate, wherein when the next frame refresh rate is used, the gate driving signal corresponding to the refresh rate of the current frame is input in one frame time of the current frame, the low level of the gate driving signal is maintained in one frame time, that is, the thin film transistor of the scanning line is kept off, so that the voltages of the pixels of the two frames are different, and the difference between the corresponding common level and the pixel charging voltage of the two frames of the current frame is different, and there is a brightness difference, so that the first common level VCOM1 is controlled to be input to the common line corresponding to the display device in the first period, the second common level VCOM2 is controlled to be input to the common line corresponding to the display device in the second period, and the common level is close to the difference between the pixel charging voltages in the two frame times of the current frame (in the first period and the second period of the next frame), so that the flicker problem caused by obvious brightness difference is avoided.
Considering that there are various possibilities of switching the refresh rate, such as 60Hz to 120Hz, 120Hz to 240Hz, and considering that the difference of the refresh rates is different, the more obvious the difference of brightness and darkness may be caused, the more the common level needs to be changed to improve the difference of brightness and darkness, so that the switching of different refresh rates can be used.
As shown in fig. 5, as a fourth embodiment of the present application, a driving circuit 200 of a display device is disclosed, the driving circuit 200 drives the display device using the driving method described in any of the embodiments above, the driving circuit 200 includes a gate driving circuit 210 and a frequency control circuit 220, the gate driving circuit 210 generates a gate driving signal to the scan line 110 corresponding to the display device according to the current refresh rate; the frequency control circuit 220 is disposed between the scan line 110 and the gate driving circuit 210; the frequency control circuit 220 changes the gate driving signal output by the gate driving circuit 210 to control the turn-on time of the scan line 110 in each frame, and generates a gate driving signal corresponding to a new refresh rate to the display device for refresh display.
Taking the current frame as 240hz and the next frame as 120hz as an example for illustration, referring to fig. 2 and 5, the waveform of the gate driving signal corresponding to the refresh rate of 240hz is different from the waveform of the gate driving signal corresponding to the refresh rate of 120hz, and when the waveform is 120hz, the time of one frame corresponding to 120hz is twice the time of one frame corresponding to 240hz, but when the refresh rate is 120hz, the gate driving signal corresponding to 240hz is only input once in one frame time corresponding to 120hz, the change of the refresh rate mainly controls the period time of the scanning line, that is, the turn-on time of the thin film transistor corresponding to the scanning line, and when the same time is used, the period of one line corresponding to 240hz is T1, the primary gate driving signal is input, and when the period of one line corresponding to 120hz is T2, the primary gate driving signal is input, and when the display device is driven, the different refresh rates are obtained, thereby reducing the power consumption.
As shown in fig. 6, as a further refinement of the fourth embodiment of the present application, the gate driving circuit 210 includes a plurality of gate driving units 211, and each gate driving unit 211 is taken as an example and illustrated by corresponding to one frequency control circuit 220, where the frequency control circuit 220 includes a gate signal input module 221, a gate signal pull-down module 222, and a frequency pull-down module 223, the control end and the input end of the gate signal input module 221 are connected to the output end of the gate driving unit 210 corresponding to the previous row of scanning lines 110, and the output end of the gate signal input module 221 is connected to the input end of the scanning line 110; the control end of the gate signal pull-down module 222 is connected to the output end of the gate driving unit corresponding to the current line scanning line 110, the input end is connected to the first level signal input end of the gate driving unit 211, and the output end is connected to the output end of the gate signal input module 221; the control end of the frequency pull-down module 223 is connected with the output end of the frequency control voltage FCV, the input end is connected with the first level signal input end of the gate driving unit 211, the first level signal is a VSS signal, and the output end is connected with the output end of the gate signal input module 221; when the frequency control circuit 220 is the second level signal VGH after the end of the previous frame scan and the next frame scan, the frequency pull-down module 223 controls all the gate signals to be low-level input to all the scan lines 110.
In this embodiment, the frequency control circuit of the foregoing embodiment is further refined, and the refresh rate is changed mainly by pulling down the gate driving signal, so that the thin film transistor on the scan line is kept turned off, that is, in the original two-frame time of 240hz, one frame of input gate driving signal controls the thin film transistor on the scan line to be turned on, and when one frame of input gate driving signal is input to the scan line, the gate driving signal is directly pulled down to a low level by the frequency pull-down module, the thin film transistor on the scan line is kept turned off, one frame of operation is performed, one frame of operation is not performed, and in the 2-frame time corresponding to 240hz, if the two frames of operation are refreshed, but only one frame of operation is performed when the 120hz is refreshed.
In addition, the control of pulling down the gate driving signal is one means for turning off the thin film transistor on the scan line, and the effect can be achieved by directly controlling the off frame start signal to directly turn off the output of the gate driving signal.
As shown in fig. 7, as a sixth embodiment of the present application, the gate signal input module includes a first transistor M1, a second transistor M2, and a first capacitor C1, the gate signal pull-down module includes a third transistor M3, and the frame pull-down module includes a fourth transistor M4; the input end and the control end of the first transistor M1 are connected to the output end of the gate driving unit 211 in the previous row, and the output end is connected to the control end of the second transistor M2; the input end of the second transistor M2 is connected with the output end of the upper row of grid driving units, and the output end of the second transistor M2 is connected with the input end of the scanning line; two ends of the first capacitor C1 are respectively connected with the control end and the output end of the second transistor M2; the control end of the third transistor M3 is connected with the output end of the current row gate driving unit, the input end of the third transistor M3 is connected with the first level signal input end of the current row gate driving unit, and the output end of the third transistor M3 is connected with the input end of the scanning line; the control end of the fourth transistor is connected with the output end of the frequency control voltage, the input end of the fourth transistor is connected with the first level signal input end VSS of the current row grid driving unit, and the output end of the fourth transistor is connected with the input end of the scanning line.
Referring to fig. 7 and 8, an example is illustrated in which the current frame is 240hz, the next frame is 120hz, gout (2) outputs a low voltage when Gout (1) outputs a high level when n=2, the first transistor M1 is turned on, and the third transistor M3 is turned off. The gate of the second transistor M2 is written into Gout (1), and at this time, the second transistor M2 is turned on, and SCAN (2) is written into Gout (1). The FCV signal is low at this stage and the fourth transistor M4 is turned off. In the second frame, the FCV signal is high and the fourth transistor M4 is turned on, and in this frame, all SCAN outputs are low VGL. And in the third frame, the four transistors TFT work as in the first frame, namely the odd frame normally outputs SCAN, the even frame and the SCAN signal is low voltage. So the one-frame duration of the SCAN signal is 2 times of the one-frame duration of the Gout output, namely when the output frequency of the Gout is 240HZ, the SCAN output frequency is 120HZ; correspondingly, referring to fig. 9, the duration of one frame of the SCAN signal is 4 times the duration of one frame of GOUT output, that is, when the GOUT output frequency is 240hz, the SCAN output frequency is 60hZ; further, referring to fig. 10, if the refresh rates of the current frame and the next frame are not changed, the FCV continuously inputs the low level VGL, and the fourth transistor M4 maintains the off state.
As shown in fig. 11, as a seventh embodiment of the present application, a display device 100 is disclosed, where the display device includes the driving circuit 200, the timing control module 300 and the refresh rate acquisition comparison module 400 described in any one of the embodiments, the timing control module 300 outputs the clock signal CLK and the frame start signal STV to the gate driving circuit 210 of the driving circuit, the refresh acquisition comparison module 400 is connected to the frequency control circuit 220 of the driving circuit, and controls the frequency control circuit 220 to work so as to change the gate driving signal output by the gate driving unit 210, control the on time of the scan line in each frame, and generate a gate driving signal corresponding to a new refresh rate to the display device for refresh display.
In this embodiment, referring to fig. 2 and 11, the timing control module 300 may control the input of a frame start signal, the refresh rate obtaining and comparing module 400 may first obtain the refresh rates of the current frame and the next frame, and take the refresh rate of 240hz of the current frame and the refresh rate of 120hz of the next frame as an example, in the first period of the next frame, input the frame start signal of the refresh rate of the current frame, and control the line-by-line opening of the thin film transistors on each line of scan lines; in a second time period of the next frame, the frequency control circuit is started, and a low-level signal is input to all scanning lines of all rows so as to turn off all the thin film transistors corresponding to all the scanning lines; if the refresh rate of the front frame and the back frame is not changed, the normal output of the frame start signal of each frame is normally controlled.
It should be noted that, the limitation of each step in the present solution is not to be considered as limiting the sequence of steps on the premise of not affecting the implementation of the specific solution, and the steps written in the previous step may be executed before, may be executed after, or may even be executed simultaneously, so long as the implementation of the present solution is possible, all should be considered as falling within the protection scope of the present application.
It should be noted that, the inventive concept of the present application may form a very large number of embodiments, but the application documents have limited space and cannot be listed one by one, so that on the premise of no conflict, the above-described embodiments or technical features may be arbitrarily combined to form new embodiments, and after the embodiments or technical features are combined, the original technical effects will be enhanced.
The technical scheme of the application can be widely applied to driving circuits of various display panels, such as driving circuits of TN (Twisted Nematic) display panels, driving circuits of IPS (In-Plane Switching) display panels, driving circuits of VA (Vertical Alignment) display panels, driving circuits of MVA (Multi-Domain Vertical Alignment) display panels, and driving circuits of other types of display panels, such as driving circuits of OLED (Organic Light-Emitting Diode) display panels, and the scheme can be applied.
The foregoing is a further detailed description of the present application in connection with specific alternative embodiments, and it is not intended that the practice of the present application be limited to such descriptions. It should be understood that those skilled in the art to which the present application pertains may make several simple deductions or substitutions without departing from the spirit of the present application, and all such deductions or substitutions should be considered to be within the scope of the present application.

Claims (10)

1. A driving method of a display device, comprising the steps of:
the refresh rates of the current frame and the next frame of the display device are obtained; and
comparing the refresh rate of the current frame with the refresh rate of the next frame, if the refresh rate of the current frame is greater than the refresh rate of the next frame, starting a first display mode to drive the display device for display, and if the refresh rate of the current frame is less than the refresh rate of the next frame, starting a second display mode to drive the display device for display;
the specific steps of the first display mode include:
generating corresponding scanning signals according to refresh rate parameters of the current frame in a first time period of the next frame, controlling the thin film transistors on each row of scanning lines to be turned on row by row, and turning off all the thin film transistors corresponding to all the scanning lines in a second time period of the next frame;
the specific steps of the second display mode include:
generating a corresponding scanning signal according to the refresh rate parameter of the next frame in one frame time of the next frame, and controlling the thin film transistors on each row of scanning lines to be opened row by row;
the duration of the first time period is equal to one frame duration corresponding to the current frame refresh rate, the duration of the second time period is n times of the duration of the first time period, and n is a positive number.
2. The driving method according to claim 1, wherein the corresponding scan signal is generated according to the refresh rate parameter of the current frame in the first period of the next frame, and the thin film transistors on each row of scan lines are controlled to be turned on row by row; in the second period of the next frame, the step of turning off all the thin film transistors corresponding to all the scanning lines includes:
in a first time period of a next frame, inputting a frame start signal of a current frame refresh rate, and controlling the thin film transistors on each row of scanning lines to be turned on row by row; in the second period of the next frame, the frequency control circuit is turned on, and a low-level signal is input to the scanning lines of all rows so as to turn off all the thin film transistors corresponding to all the scanning lines.
3. The driving method according to claim 1, wherein the corresponding scan signal is generated according to the refresh rate parameter of the current frame in the first period of the next frame, and the thin film transistors on each row of scan lines are controlled to be turned on row by row; in the second period of the next frame, the step of turning off all the thin film transistors corresponding to all the scanning lines includes:
in a first time period of a next frame, inputting a frame start signal of a current frame refresh rate, and controlling the thin film transistors on each row of scanning lines to be turned on row by row; and in a second time period of the next frame, turning off a frame start signal of the current frame refresh rate, and inputting scanning signals of scanning lines of all rows into a low level to turn off all thin film transistors corresponding to all the scanning lines.
4. The driving method according to claim 1, wherein the first period is preceded and the second period is set after and continuously from the first period, and in the first display mode, a sum of values of the first period and the second period of a next frame is equal to one frame time of a current frame.
5. The driving method as claimed in claim 4, wherein a current frame refresh rate is F1, a next frame refresh rate is F2, a frame duration corresponding to the current frame refresh rate is T1, and a frame duration corresponding to the next frame refresh rate is T2; the first time period is t1, and the second time period is t2;
wherein t1=t1, t2=t1+t2, f1/f2=t1+t2/T1.
6. The driving method as claimed in claim 5, wherein the step of generating the corresponding scan signal according to the refresh rate parameter of the current frame during the first period of the next frame, controlling the thin film transistors on each row of scan lines to be turned on row by row, and turning off all the thin film transistors corresponding to all the scan lines during the second period of the next frame comprises:
generating a value of a second time period of the next frame according to the ratio of the refresh rates of the current frame and the next frame and the value of the first time period;
wherein, t2= (F1/F2-1) ×t1.
7. The driving method as claimed in claim 1, wherein the step of generating the corresponding scan signal according to the refresh rate parameter of the current frame in the first period of the next frame, controlling the thin film transistors on each row of scan lines to be turned on row by row, and turning off all the thin film transistors corresponding to all the scan lines in the second period of the next frame comprises:
a common line corresponding to the display device is controlled and input to a first common level in the first time period, and a common line corresponding to the display device is controlled and input to a second common level in the second time period;
wherein the voltage value of the second common level is smaller than the voltage value of the first common level.
8. A driving circuit of a display device, which drives the display device using the driving method according to any one of claims 1 to 7, characterized in that the driving circuit comprises:
the grid driving circuit generates a grid driving signal to a scanning line corresponding to the display device according to the current refresh rate; and
a frequency control circuit provided between the scanning line and the gate driving circuit;
the frequency control circuit changes the gate driving signal output by the gate driving circuit to control the opening time of the scanning line in each frame, and generates a gate driving signal corresponding to a new refresh rate to the display device for refresh display.
9. The driving circuit of the display device according to claim 8, wherein the gate driving circuit includes a plurality of gate driving units, one frequency control circuit is corresponding to each gate driving unit, the frequency control circuit includes a gate signal input module, a gate signal pull-down module, and a frequency pull-down module, the control terminal and the input terminal of the gate signal input module are connected to the output terminal of the gate driving unit corresponding to the scanning line of the previous row, and the output terminal of the gate signal input module is connected to the input terminal of the scanning line;
the control end of the grid signal pull-down module is connected with the output end of the grid driving unit corresponding to the current line scanning line, the input end of the grid signal pull-down module is connected with the first level signal input end of the grid driving unit, and the output end of the grid signal pull-down module is connected with the output end of the grid signal input module;
the control end of the frequency pull-down module is connected with the output end of the frequency control voltage, the input end of the frequency pull-down module is connected with the first level signal input end of the grid driving unit, and the output end of the frequency pull-down module is connected with the output end of the grid signal input module;
when the frequency control circuit is a second level signal after the scanning of the previous frame is finished and the next frame is scanned, the frequency pull-down module controls all gate signals to be low-level and input the low-level signals to all scanning lines.
10. A display device, characterized by comprising a driving circuit, a time sequence control module and a refresh rate acquisition and comparison module according to any one of claims 8-9, wherein the time sequence control module outputs a clock signal and a frame start signal to a gate driving circuit of the driving circuit, the refresh acquisition and comparison module is connected with a frequency control circuit of the driving circuit and controls the frequency control circuit to work so as to change a gate driving signal output by the gate driving unit, control the opening time of the scanning line in each frame, and generate a gate driving signal corresponding to a new refresh rate to the display device for refresh display.
CN202310322831.XA 2023-03-29 2023-03-29 Driving method and driving circuit of display device and display device Pending CN116386558A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117456966A (en) * 2023-12-20 2024-01-26 惠科股份有限公司 Display panel driving method and display panel
CN117456929A (en) * 2023-12-22 2024-01-26 惠科股份有限公司 Display panel driving method and display panel

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117456966A (en) * 2023-12-20 2024-01-26 惠科股份有限公司 Display panel driving method and display panel
CN117456966B (en) * 2023-12-20 2024-05-14 惠科股份有限公司 Display panel driving method and display panel
CN117456929A (en) * 2023-12-22 2024-01-26 惠科股份有限公司 Display panel driving method and display panel
CN117456929B (en) * 2023-12-22 2024-03-19 惠科股份有限公司 Display panel driving method and display panel

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