CN115472138A - Gamma voltage adjusting method, driving circuit and display device - Google Patents
Gamma voltage adjusting method, driving circuit and display device Download PDFInfo
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- CN115472138A CN115472138A CN202211197486.3A CN202211197486A CN115472138A CN 115472138 A CN115472138 A CN 115472138A CN 202211197486 A CN202211197486 A CN 202211197486A CN 115472138 A CN115472138 A CN 115472138A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
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Abstract
The application discloses a gamma voltage regulating method, a driving circuit and a display device, wherein the gamma voltage regulating method comprises the following steps: the display panel enters a variable refresh rate mode; acquiring a target refresh rate and a refresh rate of a current frame, acquiring a gamma compensation voltage corresponding to the refresh rate of the current frame according to the refresh rate and the target refresh rate of the current frame, and calculating a gamma driving voltage of the display panel according to the gamma compensation voltage and a gamma reference voltage of the current frame; driving the display panel with the obtained gamma driving voltage; repeating the above steps in the vertical blanking period of the next frame until the display panel exits the variable refresh rate mode; and under the same gray scale, the gamma driving voltage compensated by the gamma compensation voltage enables the brightness of the current frame refresh rate to be consistent with the brightness of the target refresh rate. The gamma voltage adjusting method improves the problem that the display panel has larger brightness difference or flickers appear in the display when the refresh frequency is different by setting the gamma compensation voltage.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a gamma voltage adjusting method, a driving circuit and a display device.
Background
In recent years, the heat of the electric competition market makes many hardware manufacturers see business opportunities, so that the selection of the display is more and more diversified, wherein fresync (variable refresh rate technology) is gradually becoming a key functional technical index in the field of main current electric competition display.
The Freesync technique was originally proposed by AMD manufacturers to address image tearing and fluctuations, and thus improve the smooth game experience, and is also known by the official as Variable Refresh Rate (VRR) as a technique for dynamically adjusting the Refresh Rate of a display to match the Refresh Rate of a graphics card with a Variable Refresh Rate. It is known that displays supporting Freesync require the coordinated participation of AMD's video card and APU (Accelerated Processing Unit).
The Freesync technology dynamically adjusts the refresh frequency of the display by changing the vertical blanking period (Vblank), and in the Vblank interval, the liquid crystal is always in a leakage state, and particularly, the liquid crystal leaks more seriously when the refresh rate is low, so that the voltage of a pixel electrode is lower, and further, the problem that the brightness difference of the display panel is larger or the display flickers when the refresh frequency is different is caused.
Disclosure of Invention
The application aims to provide a gamma voltage regulating method, a driving circuit and a display device, wherein the gamma compensation voltage is set in a variable refresh rate mode, so that the problem that the brightness difference of a display panel is large or display flickers at different refresh frequencies is solved, and the display effect is improved.
The application discloses a gamma voltage regulating method, which comprises the following steps:
s1: the display panel enters a variable refresh rate mode;
s2: acquiring a target refresh rate and a refresh rate of a current frame, acquiring a gamma compensation voltage corresponding to the refresh rate of the current frame according to the refresh rate and the target refresh rate of the current frame, and calculating a gamma driving voltage of the display panel according to the gamma compensation voltage and a gamma reference voltage of the current frame;
s3: driving the display panel with the obtained gamma driving voltage;
s4: repeating the step S2 in the vertical blanking period of the next frame until the display panel exits the variable refresh rate mode;
and under the same gray scale, the gamma driving voltage compensated by the gamma compensation voltage enables the brightness of the current frame refresh rate to be consistent with the brightness of the target refresh rate.
Optionally, the step S2 specifically includes:
s21: acquiring a target refresh rate;
s22: acquiring the refresh rate of the current frame according to the duration of the vertical blanking period of the current frame;
s23: acquiring gamma compensation voltage corresponding to the refresh rate of the current frame according to the refresh rate of the current frame and the target refresh rate;
s24: calculating the gamma driving voltage of the display panel according to the gamma compensation voltage and the gamma reference voltage of the current frame;
s25: writing the acquired gamma driving voltage in a vertical blanking period of a next frame;
after the step S25 writes the obtained gamma driving voltage, the gamma driving voltage drives the display panel in the display stage of the next frame.
Optionally, the step S2 specifically includes:
s21': acquiring a target refresh rate;
s22': detecting the duration of a vertical blanking period of the current frame in real time, and writing an nth gamma compensation voltage into the time sequence control module when the duration of the vertical blanking period of the current frame reaches an nth preset value, wherein n is equal to 1;
s23': judging whether the vertical blanking period of the current frame is finished or not, and executing the step S3 if the vertical blanking period of the current frame is finished; if not, making n equal to n +1, and re-executing step S22';
wherein n is a natural number, and after the step S23' is finished, the written gamma compensation voltage is used to drive the display panel in the display stage of the next frame.
Optionally, the value of the gamma compensation voltage is a sum of a gamma voltage value corresponding to a brightness difference value of the refresh rate of the current frame and the target refresh rate at the same gray level and a leakage voltage value in the vertical blanking period of the current frame.
Optionally, the plurality of gamma compensation voltages are divided into a plurality of groups of data according to a preset target refresh rate, each group of data corresponds to one target refresh rate, each group of data is composed of at least two gamma compensation voltages, and the gamma compensation voltages in each group of data are divided according to the refresh rate.
Optionally, the display panel has a plurality of gray scales, the gamma driving voltages are multiple, and the plurality of gray scales correspond to the plurality of gamma driving voltages; wherein, according to different gray scales, different gamma driving voltages are called to drive the display panel.
Optionally, a step is further included between steps S1 and S2:
when the current frame enters a vertical blanking period, a preset array substrate common voltage is used for driving; the preset common voltage of the array substrate is greater than the common voltage of the array substrate in the display stage of the current frame.
Optionally, a step is further included between steps S1 and S2:
driving by using a preset common voltage of the color film substrate;
and the common voltage of the color film substrate is the common voltage when the brightness of the display panel is maximum under 255 gray scales.
The application also discloses a driving circuit which is driven by the gamma voltage regulating method, the driving circuit comprises a detection module, a storage module, a compensation voltage acquisition module and a time sequence control module, and the detection module detects whether the display panel enters a variable refresh rate mode; the storage module stores gamma compensation voltage; the compensation voltage acquisition module is electrically connected with the detection module and the storage module; the time sequence control module is electrically connected with the compensation voltage acquisition module; when the detection module detects that the display panel enters the variable refresh rate mode, the compensation voltage acquisition module acquires the gamma compensation voltage corresponding to the refresh rate of the current frame according to the refresh rate of the current frame and the target refresh rate and outputs the gamma compensation voltage to the time sequence control module, and the time sequence control module calculates and acquires the gamma driving voltage according to the gamma compensation voltage and the gamma reference voltage of the current frame so as to drive the display panel.
The application also discloses a display device, which comprises a display panel and the driving circuit, wherein the driving circuit is configured to execute the gamma voltage regulating method.
The application provides a gamma voltage regulating method, whether through detecting display panel entering variable refresh rate mode, obtain display panel's target refresh rate and current frame's refresh rate, according to the difference of current frame's refresh rate and predetermined target refresh rate, select the gamma compensation voltage that current frame refresh rate corresponds, according to gamma compensation voltage and current frame's gamma reference voltage again, obtain display panel's gamma drive voltage in order to drive display panel, in order to carry out luminance correction to display panel, make display panel's gamma drive voltage can change along with display panel's refresh rate change, improve display panel's the great or problem that the demonstration appears flickering of luminance difference when different refresh frequencies, improve display effect.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, 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 application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a flow chart of the steps of a gamma voltage regulating method according to a first embodiment of the present application;
FIG. 2 is a flow chart of the steps of a gamma voltage regulating method according to a second embodiment of the present application;
FIG. 3 is a flow chart of the steps of a gamma voltage regulating method according to a third embodiment of the present application;
fig. 4 is a schematic diagram of a driving circuit according to a fourth embodiment of the present application;
fig. 5 is a schematic structural diagram of a display device according to a fifth embodiment of the present application.
100, a display device; 200. a display panel; 300. a drive circuit; 310. a detection module; 320. a compensation voltage acquisition module; 330. a storage module; 400. and a time sequence control module.
Detailed Description
It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are representative, but that the present 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 as implicitly indicating the number of technical features indicated. Thus, unless stated otherwise, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The terms "comprises" and "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 combinations thereof may be present or added.
Further, terms of orientation or positional relationship indicated by "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are described based on the orientation or relative positional relationship shown in the drawings, are simply for convenience of description of the present application, and do not indicate that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, fixed connections, removable connections, and integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The present application will now be described in detail with reference to the drawings and alternative embodiments, it being understood that any combination of the various embodiments or technical features described below may form new embodiments without conflict.
To solve the problem that the display panel 200 in the prior art is prone to have large brightness difference or display flicker when the refresh rate changes in the variable refresh rate mode, an embodiment of the present invention provides a gamma voltage adjusting method, which can make the brightness of the display panel 200 when the refresh rate changes consistent or nearly consistent, so that human eyes are hard to perceive the flicker phenomenon, and the display effect of the display panel 200 is improved.
As shown in fig. 1, as a first embodiment of the present application, a gamma voltage adjusting method is disclosed, which is specifically applied to a display device 100 and applied to a variable refresh rate mode of a display panel 200, where it should be noted that the variable refresh rate mode of the display panel 200 refers to a mode of refresh rate switching, and the gamma voltage adjusting method includes the steps of:
s1: the display panel enters a variable refresh rate mode;
s2: acquiring a target refresh rate and a refresh rate of a current frame, acquiring a gamma compensation voltage corresponding to the refresh rate of the current frame according to the refresh rate and the target refresh rate of the current frame, and calculating a gamma driving voltage of the display panel according to the gamma compensation voltage and a gamma reference voltage of the current frame;
specifically, a target refresh rate is preset, the brightness of the target refresh rate is used as the fixed brightness, the gamma voltage adjusting method adjusts the gamma compensation voltage to make the display brightness under different refresh rates close to the display brightness of the target refresh rate, after the target refresh rate and the refresh rate of the current frame are obtained, the gamma compensation voltage corresponding to the refresh rate of the current frame is obtained according to the brightness difference value of the refresh rate of the current frame and the target refresh rate under the same gray scale, the gamma compensation voltage is input to the timing control module 400, the timing control module 400 obtains the gamma driving voltage of the display panel 200 according to the gamma compensation voltage and the gamma reference voltage of the current frame, the gamma driving voltage makes the refresh rate of the current frame and the brightness of the target refresh rate under the same gray scale consistent or nearly the same, wherein the target refresh rate is preferably a high refresh rate, for example, an arbitrary value between 100hz and 144hz, so that the display brightness of the display device 100 to which the gamma voltage adjusting method is applied is brighter, and the display effect of the display device 100 is better, of course, the target refresh rate is also can be set according to the actual situation, for example, if the display device 100 using the voltage adjusting method needs to realize the low gamma refresh rate, the low power consumption, for example, the gamma compensation rate is preferably 60 to 60 hz; in addition, the gamma compensation voltages are pre-stored in multiple groups, and the multiple groups of gamma compensation voltages respectively correspond to multiple refresh rates, it should be noted that a designer can set the number of the gamma compensation voltages according to an actual situation, and if the number of the set gamma compensation voltages is more, the accuracy of the gamma voltage adjusting method provided by this embodiment is higher, and the brightness correction of the display panel 200 is more accurate.
S3: acquiring a gamma driving voltage to drive a display panel;
specifically, after the gamma driving voltage is obtained by the timing control module 400, the timing control module 400 outputs the gamma driving voltage to a Source driver chip (Source IC) to generate sub-gamma driving voltages corresponding to different gray scales to drive the display panel 200 to display.
S4: repeating the step S2 in the vertical blanking period of the next frame until the display panel exits the variable refresh rate mode;
the gamma voltage adjusting method provided in this embodiment obtains a target refresh rate of the display panel 200 and a refresh rate of a current frame by detecting whether the display panel 200 enters a variable refresh rate mode, selects a gamma compensation voltage corresponding to the refresh rate of the current frame according to a difference between the refresh rate of the current frame and a preset target refresh rate, and obtains a gamma driving voltage of the display panel 200 according to the gamma compensation voltage and a gamma reference voltage of the current frame to drive the display panel 200, so as to perform brightness correction on the display panel 200, so that the gamma driving voltage of the display panel 200 can change along with the change of the refresh rate of the display panel 200, thereby improving the problem that the display panel 200 has a large brightness difference or flickers during display at different refresh frequencies, and improving the display effect.
As shown in fig. 2, a second embodiment of the present application is a further limitation of the first embodiment of the present application, and discloses a gamma voltage adjusting method, where the step S2 specifically includes:
s21: acquiring a target refresh rate;
s22: acquiring the refresh rate of the current frame according to the duration of the vertical blanking period of the current frame;
specifically, in the current frame period of the display panel 200, the timing control module 400 is used for detecting, the timing control module 400 uses the ending time of the display stage in the current frame period as the starting time, uses the starting time of the display stage of the next frame as the ending time, uses the time difference between the ending time and the starting time as the time length of the vertical blanking period in the current frame period, and determines the refresh rate of the current frame according to the time length of the vertical blanking period to obtain the refresh rate of the current frame, wherein in this embodiment, the time lengths of a plurality of vertical blanking periods and the refresh rate corresponding to each vertical blanking period need to be stored in advance, so that after the timing control module 400 obtains the vertical blanking period in the current frame period in real time, the refresh rate of the current frame can be directly compared with the preset time length of the vertical blanking period, thereby quickly obtaining the refresh rate of the current frame.
S23: acquiring gamma compensation voltage corresponding to the refresh rate of the current frame according to the refresh rate of the current frame and the target refresh rate;
specifically, after the timing control module 400 detects the refresh rate of the current frame, the corresponding gamma compensation voltage stored in advance is selected according to the difference between the refresh rate of the current frame and the target refresh rate.
S24: calculating the gamma driving voltage of the display panel according to the gamma compensation voltage and the gamma reference voltage of the current frame;
specifically, the gamma compensation voltage is output to the timing control module 400, and the timing control module 400 receives the gamma compensation voltage and the gamma reference voltage of the current frame and combines the gamma compensation voltage and the gamma reference voltage as the gamma driving voltage, wherein when the gamma driving voltage drives the display panel 200, the brightness of the current frame and the target refresh rate at the same gray scale are the same or nearly the same.
S25: writing the acquired gamma driving voltage in a vertical blanking period of a next frame;
specifically, after the timing control module 400 obtains the gamma driving voltage, the gamma driving voltage is written in the vertical blanking period of the next frame, so that the display panel 200 drives the display panel 200 by using the gamma driving voltage in the display stage of the next frame.
In the gamma adjusting method described in this embodiment, a duration of a vertical blanking period is detected in real time in a vertical blanking period of a current frame, a refresh rate of the current frame is obtained according to the detected duration of the vertical blanking period, a corresponding gamma compensation voltage stored in advance is selected according to a difference between the refresh rate of the current frame and a preset target refresh rate, the gamma compensation voltage is output to the timing control module 400, the timing control module 400 obtains a gamma driving voltage through the gamma compensation voltage and a gamma reference voltage of the current frame, the gamma driving voltage is written in the vertical blanking period of a next frame, the gamma driving voltage drives the display panel 200 to display a picture in a display stage of the next frame of the display panel 200, so as to perform brightness correction on the display panel 200, so that the brightness difference of the display panel 200 at different refresh frequencies or display flickers is improved, and in adjustment when the refresh rate changes, only one frame period delay exists, the brightness difference when the refresh rate changes is displayed due to a short time, so that the brightness difference or the flicker phenomenon of the display panel 200 is difficult to perceive, and the effect of displaying the current frame is easily interpreted as a frame n +2, which is the first frame.
Further, the value of the gamma compensation voltage is the sum of the gamma voltage value of the brightness difference between the refresh rate of the current frame and the target refresh rate and the leakage voltage in the vertical blanking period of the current frame, so that while the problem that the brightness of the display panel 200 flickers along with the change of the refresh rate when the refresh rate of the display panel 200 changes is solved, the problem that the actual display brightness of the display panel 200 is not matched with the target display brightness due to the leakage of the liquid crystal during the vertical blanking period is solved to a certain extent, and particularly in the case of a low refresh rate, the duration of the vertical blanking period is longer than the duration of the vertical blanking period during the high refresh rate when the refresh rate of the display panel 200 is low, so that the leakage of the liquid crystal during the vertical blanking period is longer when the refresh rate of the display panel 200 is low, and the brightness of the display panel 200 cannot reach the standard brightness value, and the leakage voltage of the liquid crystal is added to the gamma compensation voltage can improve the brightness difference of the display panel 200 at different refresh rates, and further enable the brightness difference of the display panel 200 to reach the standard brightness value.
Based on the above embodiment, the plurality of gamma compensation voltages are divided into a plurality of groups of data according to the preset target refresh rate, each group of data corresponds to a target refresh rate, each group of data is composed of at least two gamma compensation voltages, the gamma compensation voltages in each group of data are divided according to the refresh rate, and in order to better explain the above, the following explanation will be made with the target refresh rate being 100 hz:
when the refresh rate of the current frame is detected to be 66hz, calling the gamma compensation voltage stored in advance, firstly finding a group of data belonging to a target refresh rate of 100hz according to the target refresh rate, wherein the group of gamma compensation voltage data is divided into a plurality of data according to the numerical value of the refresh rate, a plurality of gamma compensation voltages in the group of data correspond to different refresh rate interval values according to the numerical value of the refresh rate, taking the refresh rate range of the display panel 200 as 48 hz-144 hz as an example, the 48 hz-52 hz is divided into a first interval, the 53 hz-75 hz is divided into a second interval, the 76 hz-96 hz is divided into a third interval, the 97 hz-110 hz is divided into a fourth interval, the 111 hz-125 hz is divided into a fifth interval, the 126 hz-144 hz is divided into a sixth interval, and at the moment, the refresh rate of the current frame is 66hz and is located in the second interval range, calling the gamma compensation voltage corresponding to the second interval to be output to a timing control circuit so as to improve the change of the display panel 200 due to the refresh rate; the interval division rule is only an example, and is not limited, and a designer may select the interval division rule according to an actual situation, and may divide a plurality of intervals according to the actual situation to improve the brightness correction accuracy of the display panel 200, and certainly, if the plurality of intervals need to be divided, the corresponding amount of stored data may also be correspondingly increased, so a simple calculation method may also be adopted to select the gamma compensation voltage, for example, the gamma voltage compensation values of the highest refresh rate 144hz and the lowest refresh rate 48hz are given, and then interpolation calculation is performed, which is not described herein again.
Further, when the corresponding gamma compensation voltage stored in advance is called and output to the timing control module 400, the MCU unit inside the timing control module 400 may be utilized to dynamically adjust the gamma compensation voltage in the PMIC according to the change of the refresh rate of the current frame, each I2C command corresponds to a gamma compensation voltage with a different frequency in the vertical blanking period, and the N I2C commands are output to switch different gamma compensation voltages, so that the brightness of the display panel 200 is close to the brightness of the target refresh rate, so as to keep the display brightness of the display panel 200 unchanged or almost similar, thereby improving the problem of display flicker caused by the brightness difference or display of the display panel 200 at different refresh frequencies.
Based on the above embodiment, the method further includes, between steps S1 and S2:
driving by using a preset color film substrate common voltage (CFvcom);
specifically, when the display panel 200 enters the variable refresh rate mode, the display panel is driven by using a preset color filter substrate common voltage, wherein the preset color filter substrate common voltage is a common voltage when the luminance of the display panel 200 is maximum at 255 gray levels, according to the V-T curve characteristic, the transmittance and luminance of the liquid crystal depend on a voltage difference between the CFvcom and the gamma driving voltage, and the luminance is brighter as the transmittance of the liquid crystal is higher as the gamma driving voltage is higher, according to this characteristic, the best CFvcom at 255 gray levels is found in the variable refresh rate mode to be used as the CFvcom when the display panel 200 enters the variable refresh rate module, and when the display panel 200 is switched to the normal display mode, the CFvcom in the normal display mode is used.
The display panel 200 has a plurality of gray scales, and the plurality of gamma driving voltages correspond to a plurality of gamma driving voltages; the display panel 200 is driven by calling different gamma driving voltages according to different gray scales, and after the timing control module 400 obtains the gamma compensation voltage, the gamma compensation voltage and the gamma reference voltage are output to a Source driver chip (Source IC), and the Source driver chip generates voltages of all gray scales by combining the gamma voltages inside the Source driver chip, and then outputs the gamma driving voltages of corresponding gray scales to drive the display panel 200.
Based on the above embodiment, the method further includes, between steps S1 and S2:
when the current frame enters a vertical blanking period, driving by using a preset array substrate common voltage (Avcom), wherein the preset array substrate common voltage is greater than the array substrate common voltage in the display stage of the current frame;
specifically, when the current frame enters the vertical blanking period, that is, when the current frame enters the Vblank interval, the liquid crystal is in a leakage state, but in this embodiment, by pulling up Avcom, the charge amount of the storage capacitor Cst is increased to partially offset the leakage, and the method is used in combination with the method of applying the gamma compensation voltage, so that the problem of brightness difference or flicker occurring when the display panel 200 switches the refresh rate can be better improved.
As shown in fig. 3, a third embodiment of the present application is an improvement of the first embodiment of the present application, and discloses a gamma voltage adjusting method, where the step S2 specifically includes:
s21': acquiring a target refresh rate;
s22': detecting the duration of the vertical blanking period of the current frame in real time, and writing an nth gamma compensation voltage into the time sequence control module when the duration of the vertical blanking period of the current frame reaches an nth preset value, wherein n is equal to 1;
specifically, the detection is performed by the timing control module 400, in a current frame period of the display panel 200, the timing control module 400 takes an ending time of a display stage in the current frame period as a starting time, obtains a time difference between the current time and the starting time in real time, and takes the time difference as a time length of a vertical blanking period in the current frame period obtained in real time, when the time length of the vertical blanking period in the current frame period obtained in real time reaches an nth preset value, an nth gamma compensation voltage corresponding to the nth preset value is written into the timing control module 400, so as to compensate the gamma voltage in the current frame, wherein n is a natural number;
s23': judging whether the vertical blanking period of the current frame is finished or not, and executing the step S3 if the vertical blanking period of the current frame is finished; if not, making n equal to n +1, and re-executing step S22';
specifically, when the duration of the vertical blanking period in the current frame period obtained in real time reaches the nth preset value, the nth gamma compensation voltage corresponding to the nth preset value is written into the timing control module 400, and whether the vertical blanking period of the current frame is finished is determined, if the vertical blanking period of the current frame is not finished, the timing control module 400 continues to obtain the duration of the vertical blanking period in the current frame period in real time, and determines whether the duration reaches the (n + 1) th preset value, if so, the (n + 1) th gamma compensation voltage corresponding to the (n + 1) th preset value is written, and the step S23' is repeated until the vertical blanking period of the current frame is finished.
To better explain the above, the following explanation will be made with 60hz as the refresh rate of the current frame:
the timing control module 400 takes an ending time of a display period as a starting time, obtains a time difference between the current time and the starting time in real time, when the time difference reaches a vertical blanking period of 120hz, the timing control module 400 determines that the current frame is 120hz, and writes a gamma compensation voltage corresponding to 120hz to the timing control module 400 in real time, when a vertical blanking period of the current frame is not ended, the timing control module 400 further detects the current time in real time, and obtains a time difference between the current time and the starting time in real time, when the time difference reaches a vertical blanking period of 80hz, the timing control module 400 determines that the current frame is 80hz, and writes a gamma compensation voltage corresponding to 80hz to the timing control module 400 in real time, when the vertical blanking period of the current frame is not ended, until the time difference reaches a vertical blanking period of 60hz, the timing control module 400 determines that the current frame is 60hz, and writes a gamma compensation voltage corresponding to 60hz to the timing control module 400 in real time, and the timing control module 400 generates a gamma compensation voltage corresponding to the current frame according to a gamma compensation voltage change of the display panel in real time, and the display panel 200.
In summary, in the gamma voltage adjusting method described in this embodiment, the duration of the vertical blanking period is detected in real time in the vertical blanking period of the current frame, and the corresponding gamma compensation voltage is output to the timing control module 400 in real time according to the acquired duration of the vertical blanking period, the timing control module 400 obtains the gamma driving voltage through the gamma compensation voltage and the gamma reference voltage of the current frame, and can write in the gamma driving voltage in real time, when the display panel 200 enters the display stage of the next frame, the display panel 200 can be driven by using the gamma driving voltage, so as to perform real-time brightness correction on the display panel 200, so that the gamma driving voltage of the display panel 200 can change along with the change of the refresh rate of the display panel 200, the problem of the brightness difference or the display flicker of the display panel 200 at different refresh rates is solved, and the display effect of the display panel 200 is improved.
As shown in fig. 4, as a fourth embodiment of the present application, a driving circuit 300 is disclosed, where the driving circuit 300 is driven by using the gamma voltage adjusting method according to the above embodiment, the driving circuit 300 includes a detecting module 310, a storing module 330, a compensation voltage obtaining module 320, and a timing control module 400, and the detecting module 310 detects whether the display panel enters into the variable refresh rate mode; the storage module 330 stores gamma compensation voltages; the compensation voltage obtaining module 320 is electrically connected to the detecting module 310 and the storage module 330; the timing control module 340 is electrically connected with the compensation voltage obtaining module 320; when the detection module 310 detects that the display panel 200 enters the variable refresh rate mode, the compensation voltage obtaining module 320 obtains the gamma compensation voltage corresponding to the refresh rate of the current frame according to the refresh rate of the current frame and the target refresh rate, and outputs the gamma compensation voltage to the timing control module 340, and the timing control module 340 obtains the gamma driving voltage to drive the display panel 200 by calculation according to the gamma compensation voltage and the gamma reference voltage of the current frame.
The driving circuit 300 of this embodiment obtains the target refresh rate of the display panel 200 and the refresh rate of the current frame by detecting whether the display panel 200 enters the variable refresh rate mode, selects the gamma compensation voltage corresponding to the refresh rate of the current frame according to the difference between the refresh rate of the current frame and the preset target refresh rate, and then obtains the gamma driving voltage of the display panel 200 according to the gamma compensation voltage and the gamma reference voltage of the current frame to drive the display panel 200, so as to perform brightness correction on the display panel 200, so that the gamma driving voltage of the display panel 200 can change along with the change of the refresh rate of the display panel 200, thereby improving the problem that the display panel 200 applying the driving circuit 300 has a large brightness difference or display flicker at different refresh frequencies, and improving the display effect of the display panel 200 applying the driving circuit 300.
As shown in fig. 5, as a fifth embodiment of the present application, a display device 100 is disclosed, the display device 100 includes a display panel 200 and a driving circuit 300 as described in the above embodiments, the driving circuit 300 is configured to perform the gamma voltage adjusting method as described in the above embodiments.
It should be noted that, on the premise of not affecting the implementation of the specific embodiment, the limitations of the steps involved in the present disclosure are not considered as limiting the order of the steps, and the steps written in the foregoing may be executed first, or executed later, or even executed simultaneously, and as long as the present disclosure can be implemented, all the steps should be considered as belonging to the protection scope of the present disclosure.
The technical solution of the present application can be widely applied to various display panels, such as TN (Twisted Nematic) display panel, IPS (In-Plane Switching) display panel, VA (Vertical Alignment) display panel, MVA (Multi-Domain Vertical Alignment) display panel, and of course, other types of display panels, such as OLED (Organic Light-Emitting Diode) display panel, and the above solution can be applied thereto.
It should be noted that the inventive concept of the present application can form a great variety of embodiments, but the application documents are limited in space and cannot be listed one by one, so that, on the premise of no conflict, any combination between the above-described embodiments or technical features can form a new embodiment, and after each embodiment or technical feature is combined, the original technical effect will be enhanced.
The foregoing is a more detailed description of the present application in connection with specific alternative embodiments, and the specific implementations of the present application are not to be considered limited to these descriptions. For those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.
Claims (10)
1. A gamma voltage adjustment method, comprising the steps of:
s1: the display panel enters a variable refresh rate mode;
s2: acquiring a target refresh rate and a refresh rate of a current frame, acquiring a gamma compensation voltage corresponding to the refresh rate of the current frame according to the refresh rate and the target refresh rate of the current frame, and calculating a gamma driving voltage of the display panel according to the gamma compensation voltage and a gamma reference voltage of the current frame;
s3: acquiring a gamma driving voltage to drive a display panel;
s4: repeating the step S2 in the vertical blanking period of the next frame until the display panel exits the variable refresh rate mode;
and under the same gray scale, the gamma driving voltage compensated by the gamma compensation voltage enables the brightness of the current frame refresh rate to be consistent with the brightness of the target refresh rate.
2. The gamma voltage regulating method of claim 1, wherein the step S2 specifically comprises:
s21: acquiring a target refresh rate;
s22: acquiring the refresh rate of the current frame according to the duration of the vertical blanking period of the current frame;
s23: acquiring gamma compensation voltage corresponding to the refresh rate of the current frame according to the refresh rate of the current frame and the target refresh rate;
s24: calculating the gamma driving voltage of the display panel according to the gamma compensation voltage and the gamma reference voltage of the current frame;
s25: writing the acquired gamma driving voltage in a vertical blanking period of a next frame;
after the step S25 writes the obtained gamma driving voltage, the gamma driving voltage drives the display panel in the display stage of the next frame.
3. The gamma voltage regulating method according to claim 1, wherein the step S2 specifically comprises:
s21': acquiring a target refresh rate;
s22': detecting the duration of a vertical blanking period of the current frame in real time, and writing an nth gamma compensation voltage into the time sequence control module when the duration of the vertical blanking period of the current frame reaches an nth preset value, wherein n is equal to 1;
s23': judging whether the vertical blanking period of the current frame is finished or not, and executing the step S3 if the vertical blanking period of the current frame is finished; if not, making n equal to n +1, and re-executing step S22';
wherein n is a natural number, and after the step S23' is finished, the written gamma compensation voltage is used to drive the display panel in the display stage of the next frame.
4. The gamma voltage adjusting method of claim 1, wherein the gamma compensation voltage has a value which is a sum of a gamma voltage value corresponding to a brightness difference between the current frame refresh rate and the target refresh rate at the same gray level and a leakage voltage value in a vertical blanking period of the current frame.
5. The gamma voltage adjusting method according to claim 4, wherein the gamma compensation voltages are divided into a plurality of groups according to a preset target refresh rate, each group of data corresponds to a target refresh rate, each group of data is composed of at least two gamma compensation voltages, and the gamma compensation voltages in each group of data are divided according to the refresh rate.
6. The gamma voltage adjustment method of claim 1, wherein the display panel has a plurality of gray levels, the plurality of gamma driving voltages are provided, and the plurality of gray levels correspond to the plurality of gamma driving voltages;
wherein, according to different gray scales, different gamma driving voltages are called to drive the display panel.
7. The gamma voltage adjusting method according to claim 1, further comprising, between the steps S1 and S2, the steps of:
when the current frame enters a vertical blanking period, a preset array substrate common voltage is used for driving;
the preset common voltage of the array substrate is greater than the common voltage of the array substrate in the display stage of the current frame.
8. The gamma voltage adjusting method of claim 1, further comprising, between the steps S1 and S2, the steps of:
driving by using a preset common voltage of the color film substrate;
and the common voltage of the color film substrate is the common voltage when the brightness of the display panel is maximum under 255 gray scales.
9. A driving circuit driven using the gamma voltage adjusting method according to any one of claims 1 to 8, the driving circuit comprising:
the detection module is used for detecting whether the display panel enters a variable refresh rate mode or not;
a storage module storing the gamma compensation voltage;
the compensation voltage acquisition module is electrically connected with the detection module and the storage module;
the time sequence control module is electrically connected with the compensation voltage acquisition module;
when the detection module detects that the display panel enters the variable refresh rate mode, the compensation voltage acquisition module acquires the gamma compensation voltage corresponding to the refresh rate of the current frame according to the refresh rate of the current frame and the target refresh rate and outputs the gamma compensation voltage to the time sequence control module, and the time sequence control module calculates and acquires the gamma driving voltage according to the gamma compensation voltage and the gamma reference voltage of the current frame so as to drive the display panel.
10. A display device comprising a display panel and the driving circuit according to claim 9, the driving circuit being configured to perform the gamma voltage adjusting method according to any one of claims 1 to 8.
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