CN113096578B - Dimming method and device of display panel - Google Patents
Dimming method and device of display panel Download PDFInfo
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- CN113096578B CN113096578B CN202110369014.0A CN202110369014A CN113096578B CN 113096578 B CN113096578 B CN 113096578B CN 202110369014 A CN202110369014 A CN 202110369014A CN 113096578 B CN113096578 B CN 113096578B
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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
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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
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- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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Abstract
The dimming method and the dimming device for the display panel provided by the embodiment of the invention can comprise the following steps: determining a selected target brightness value; acquiring corresponding driving pulse signals and working pulse signals; enabling the array substrate driving unit to work by adopting a driving pulse signal; the driving pulse signal includes: a first pulse period; the first off potential of the first pulse period is a first preset width; enabling the array substrate driving unit to work by adopting a working pulse signal; the duty pulse signal includes: a plurality of second pulse periods; the second off potential of the second pulse period is a second preset width; the second preset width is smaller than the first preset width. In the embodiment of the invention, during the PWM adjustment, after the first preset width meets the driving requirement of the driving unit of the driving array substrate, the width of the off-potential of the working pulse signal is continuously reduced, so as to improve the duty ratio of the on-potential, and avoid the problem that the on-potential duty ratio flickers due to sudden change when the PWM dimming is switched to the DC dimming.
Description
Technical Field
The invention relates to the technical field of display panels, in particular to a dimming method and a dimming device of a display panel.
Background
At present, when a user uses a display panel, the user pays more and more attention to the brightness change of the display panel, and therefore, in the prior art, a high-frequency Pulse Width Modulation (PWM) dimming technology is adopted in a low-brightness interval to achieve the eye protection effect of the display panel. The high frequency means that the number of the display screen flickering frames is increased within one second, and referring to fig. 1, the refreshing frequency of the display screen is from 60 frames per second to 120 frames per second from 60Hz to 120 Hz; wherein, a is the ratio of high level and low level in one frame, and B is the number of pulses in one frame. In fig. 1, with the example of the same ratio of high level and low level, it can be seen that as the refresh frequency of the display screen increases, the ratio of high level and low level in each frame screen is the same, and the number of pulses in each frame screen is the same, 12 in fig. 1.
In addition, when dimming a display panel, direct current power supply (DC) dimming is generally used in a high-luminance section, and Pulse Width Modulation (PWM) dimming is generally used in a low-luminance section. Wherein, when the DC dimming is carried out, the adopted pulse frequency is 1; the pulse width modulation dimming uses a higher pulse frequency, e.g., 12, 18, or 24. Referring to fig. 2, when the refresh frequency of the display panel is 120HZ, when the display panel needs to be lightened (in fig. 2, low level conduction), the duty ratio of the low level needs to be increased in the PWM dimming interval, and it can be seen that from (a) to (c) in fig. 2, the duty ratio of the low level gradually increases; whereas in the DC dimming interval (fig. 2 (d)), the low level duty ratio has been increased to the maximum (typically 99% -99.5%), and by increasing the voltage value, the brightness of the display panel is increased. However, when the PWM dimming interval (c) suddenly changes to the DC dimming interval (d), since the GOA (array display driver) for driving the display panel to perform the PWM dimming requires a minimum start high level, the high level of (c) needs to maintain a certain width, and therefore, the duty ratio of the sum of the high levels of the plurality of pulse numbers has a minimum value, in the prior art, the sudden change from the PWM dimming interval (c) to the DC dimming interval (d) is inevitably caused, and the sudden change has a sudden change in the duty ratio of the low level, which causes a problem of flicker during the dimming process, and the flicker problem becomes more serious as the refresh frequency is higher.
Disclosure of Invention
The invention provides a dimming method of a display panel, which aims to solve the problem that the existing display panel flickers from a low-brightness area to a high-brightness area during dimming.
A first aspect of the present invention provides a dimming method for a display panel, the display panel including: the array substrate driving unit is connected with the light emitting module; the method comprises the following steps:
receiving a first input of a user;
responding to the first input and determining a target brightness value selected by the first input;
acquiring a driving pulse signal and a working pulse signal corresponding to the target brightness value;
sending the driving pulse signal to the array substrate driving unit so that the array substrate driving unit controls the light-emitting module to emit light by adopting the driving pulse signal; wherein the driving pulse signal includes: a first pulse period; the first off potential of the first pulse period is a first preset width;
sending the working pulse signal to the array substrate driving unit so that the array substrate driving unit controls the light-emitting module to emit light by adopting the working pulse signal; wherein the operating pulse signal includes: a plurality of second pulse periods; the second off potentials of the plurality of second pulse periods are a second preset width; the second preset width is smaller than the first preset width.
Optionally, the display panel further comprises: a direct-current power supply dimming module; before the step of obtaining the driving pulse signal and the working pulse signal corresponding to the target brightness value, the method further includes:
if the target brightness value belongs to a first dimming interval, acquiring a voltage signal corresponding to the target brightness value;
controlling the direct-current power supply dimming module to dim the light of the light emitting module by adopting the voltage signal;
and if the target brightness value belongs to a second dimming interval, executing the step of acquiring the driving pulse signal and the working pulse signal corresponding to the target brightness value.
Optionally, the method further comprises:
setting a brightness value from 0 to N and a brightness value threshold;
setting a first dimming interval between a brightness value threshold and a brightness value N;
and setting the interval between the brightness value 0 and the brightness value threshold as a second dimming interval.
Optionally, before the step of receiving the first input of the user, the method further includes:
acquiring the starting closing potential width and the working closing potential width of the array substrate driving unit;
acquiring the number of pulses in unit time;
determining the pulse period width according to the unit time and the pulse number;
determining a driving pulse signal corresponding to the brightness value threshold according to the pulse period width and the starting and closing potential width;
and determining a working pulse signal corresponding to the brightness value threshold according to the pulse period width and the working closing potential width.
Optionally, the method further comprises:
determining a first difference value between each of the brightness values and the brightness value threshold within the second dimming interval;
determining a driving pulse signal corresponding to each brightness value according to the first difference value, the starting and closing potential width and the pulse period width;
and determining the working pulse signal corresponding to each brightness value according to the first difference value, the working closing potential width and the pulse period width.
Optionally, from the brightness value threshold to the brightness value 0, the corresponding first preset width and the second preset width are increased progressively; and the difference value of the first preset widths corresponding to the adjacent brightness values is a second difference value, the difference value of the second preset widths corresponding to the adjacent brightness values is a third difference value, and the second difference value is equal to the third difference value.
A second aspect of the present invention provides a dimming device for a display panel, the display panel including: the array substrate driving unit is connected with the light emitting module; the dimming device includes:
the receiving module is used for receiving a first input of a user;
the first determining module is used for responding to the first input and determining a target brightness value selected by the first input;
the first acquisition module is used for acquiring a driving pulse signal and a working pulse signal corresponding to the target brightness value;
the first driving module is used for sending the driving pulse signal to the array substrate driving unit so that the array substrate driving unit controls the light-emitting module to emit light by adopting the driving pulse signal; wherein the driving pulse signal includes: a first pulse period; the first off potential of the first pulse period is a first preset width;
the second driving module is used for sending the working pulse signal to the array substrate driving unit so that the array substrate driving unit controls the light-emitting module to emit light by adopting the working pulse signal; wherein the operating pulse signal includes: a plurality of second pulse periods; the second off potentials of the plurality of second pulse periods are a second preset width; the second preset width is smaller than the first preset width.
Optionally, the display panel further comprises: a direct-current power supply dimming module; further comprising:
the second obtaining module is used for obtaining a voltage signal corresponding to the target brightness value if the target brightness value belongs to a first dimming interval;
the control module is used for controlling the direct-current power supply dimming module to dim the light emitting module by adopting the voltage signal;
and the execution module is used for executing the step of acquiring the driving pulse signal and the working pulse signal corresponding to the target brightness value if the target brightness value belongs to a second dimming interval.
Optionally, the method further comprises:
the first setting module is used for setting a brightness value from 0 to N and a brightness value threshold;
the second setting module is used for setting the interval between the brightness value threshold and the brightness value N as a first dimming interval;
and the third setting module is used for setting the interval between the brightness value 0 and the brightness value threshold value as a second dimming interval.
Optionally, the method further comprises:
the third acquisition module is used for acquiring the starting closing potential width and the working closing potential width of the array substrate driving unit;
the fourth acquisition module is used for acquiring the pulse number in unit time;
the second determining module is used for determining the pulse period width according to the unit time and the pulse number;
a third determining module, configured to determine, according to the pulse period width and the start-up/shut-down potential width, a driving pulse signal corresponding to the brightness value threshold;
and the fourth determining module is used for determining a working pulse signal corresponding to the brightness value threshold according to the pulse period width and the working closing potential width.
Optionally, the method further comprises:
a fifth determining module, configured to determine a first difference between each of the brightness values and the brightness value threshold in the second dimming interval;
a sixth determining module, configured to determine, according to the first difference, the start-up/shut-down potential width, and the pulse period width, a driving pulse signal corresponding to each brightness value;
and the seventh determining module is used for determining the working pulse signal corresponding to each brightness value according to the first difference value, the working closing potential width and the pulse period width.
Optionally, from the brightness value threshold to the brightness value 0, the corresponding first preset width and the second preset width are increased progressively; and the difference value of the first preset width corresponding to the adjacent brightness value is a second difference value, the difference value of the second preset width corresponding to the adjacent brightness value is a third difference value, and the second difference value is equal to the third difference value.
The embodiment of the invention provides a dimming method of a display panel, wherein the display panel comprises the following steps: the array substrate driving unit is connected with the light emitting module; the method comprises the following steps: receiving a first input of a user; responding to the first input and determining a target brightness value selected by the first input; acquiring a driving pulse signal and a working pulse signal corresponding to the target brightness value; sending the driving pulse signal to the array substrate driving unit so that the array substrate driving unit controls the light emitting module to emit light by adopting the driving pulse signal; wherein the driving pulse signal includes: a first pulse period; the first off potential of the first pulse period is a first preset width; sending the working pulse signal to the array substrate driving unit so that the array substrate driving unit controls the light-emitting module to emit light by adopting the working pulse signal; wherein the operating pulse signal includes: a plurality of second pulse periods; the second off potentials of the plurality of second pulse periods are a second preset width; the second preset width is smaller than the first preset width. In the embodiment of the invention, by setting the working pulse signal and the driving pulse signal and setting the second preset width of the second off potential of the second pulse period to be smaller than the first preset width of the first off potential of the first pulse period, during the PWM modulation, after the first preset width meets the driving requirement of the driving array substrate driving unit, the width of the off potential of the working pulse signal can be continuously reduced, so that the duty ratio of the on potential can be improved, and the sudden change of the duty ratio of the on potential when the PWM modulation is changed to the DC modulation can be avoided, thereby avoiding the problem of flicker.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic diagram illustrating a dimming method of a display panel according to the prior art;
FIG. 2 is a schematic diagram of another dimming method for a display panel according to the prior art;
FIG. 3 is a schematic diagram of a display panel according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a dimming method of a display panel according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a pulse signal input by a light emitting module according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating a comparison of the ratio change of the ON potential provided by an embodiment of the present invention and the ratio change of the ON potential of the prior art;
FIG. 7 is a schematic circuit diagram of a display panel according to an embodiment of the present invention;
fig. 8 is a block diagram of a dimming device of a display panel according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 3, a block diagram of a display panel according to an embodiment of the present invention is shown, where the display panel includes: an array substrate driving unit 20 (GOA) and a light emitting module 10, wherein the array substrate driving unit 20 is connected with the light emitting module 10.
The light emitting module 10 includes a plurality of rows of pixels 11, and the goa is used to drive each row of pixels to emit light according to a time sequence. When the pulse signal for driving the light emitting module to emit light is N pulses per frame, N black lines appear in one frame of picture under a high-speed camera, and the higher the off potential ratio is, the higher the width of the black line is in one pulse period. Wherein, the low potential can be conducted, and the high potential can be closed; the high potential can be switched on, and the low potential can be switched off; in the embodiment of the present invention, the low potential is turned on and the high potential is turned off.
Referring to fig. 4, a flowchart illustrating steps of a dimming method of a display panel according to an embodiment of the present invention is shown, where the method includes:
In the embodiment of the present invention, any electronic device having a display panel can be applied. For example: cell phones, pads, computers, televisions, watches, etc. The receiving of the first input of the user may be receiving an input of the user through a mouse, a screen sliding input, or a voice input.
Specifically, the first input is used for adjusting the light emitting brightness of the display panel, and a user can input brightness values, and different brightness values correspond to different brightness of the display panel, so that the light emitting brightness can be adjusted.
In the embodiment of the invention, a brightness value 0 to a brightness value N are preset; wherein, N can be thousands to tens of thousands, and the specific numerical value is set according to the actual situation of the display panel.
Specifically, the corresponding relationship between the position of the touch button and the brightness value may be preset, and then determining the target brightness value selected by the first input includes: and acquiring the position of the touch button, and determining a target brightness value according to the corresponding relation. The unit of the target brightness value is nit (nit).
Further, it comprises: setting a brightness value from 0 to N and a brightness value threshold; setting a first dimming interval from a brightness value threshold (excluding the brightness value threshold) to a brightness value N; and setting the brightness value between 0 and a brightness value threshold (including the brightness value threshold) as a second dimming interval.
In the embodiment of the present invention, the brightness value 0 means that the brightness of the display panel is 0nit, and the display panel is a black screen image, that is, the pulse signal for adjusting the brightness is always in the state of the off potential.
Specifically, the corresponding relationship between the brightness value and the first dimming interval or the second dimming interval may be stored in the processor, and the target brightness value and the stored brightness value are compared by the processor, so as to determine whether the target brightness value belongs to the first dimming interval or the second dimming interval.
In addition, when the brightness value is smaller than or equal to the brightness value threshold value, the second dimming interval is determined, PWM dimming is adopted, when the brightness value is larger than the brightness value threshold value, the first dimming interval is determined, and DC dimming is adopted. In the embodiment of the present invention, the brightness value threshold is 90nit as an example.
In an embodiment of the present invention, referring to fig. 3, the display panel further includes: the direct current power dimming module 30 (DC), after step 102, further comprises: if the target brightness value belongs to a first dimming interval, acquiring a voltage signal corresponding to the target brightness value; controlling the direct-current power supply dimming module to dim the light of the light emitting module by adopting the voltage signal; if the target brightness value belongs to the second dimming interval, step 103 is executed.
The brightness value is between 0nit and N nit, and the brightness of the display panel is increased along with the increase of the brightness value; the brightness value is divided into a first dimming interval and a second dimming interval, wherein the first dimming interval is dimming by the direct current power supply in a DC mode, the ratio of the on potential of the direct current power supply in unit time in the first dimming interval is 99% -99.5%, and the larger the brightness value is, the larger the voltage value provided by the direct current power supply to each light emitting module is. The second dimming interval is that GOA adopts PWM mode to dim light, and the proportion of the opening potential in unit time is increased along with the increase of the brightness value.
And 103, acquiring a driving pulse signal and a working pulse signal corresponding to the target brightness value.
Referring to fig. 3, when PWM dimming is used, each brightness value has a corresponding driving pulse signal C and operating pulse signal D. The driving pulse signal C is used for starting the GOA, and the working pulse signal D is used for controlling the lighting module 10 to emit light by the GOA according to the working pulse signal D after the GOA is started.
In fig. 5, there are M pulse periods (12 pulse periods in fig. 5) in one frame, and each pulse period includes a low potential (on potential) and a high potential (off potential). Wherein, the width of the off potential (high potential) of the first pulse period in one frame is larger than the width of the off potential (low potential) of the following pulse period; the width of the off potential in the embodiments of the present invention refers to the duration of the off potential.
In addition, the first pulse period in each frame may be the first pulse period C, and then the second pulse period D, or in all the frames, only the first pulse period in the first frame is the first pulse period C, and the following pulse periods in the first frame and the following frames are the second pulse periods D.
Referring to fig. 5, the driving pulse signals corresponding to the target brightness values are different, and referring to fig. 5, the driving pulse signals C corresponding to the brightness values 88-90 are different, wherein the time span represented by one pulse period is the same, and the difference is the ratio of the on-potential to the off-potential, in fig. 5, the driving pulse signal C increases from the low brightness (the brightness value 88) to the high brightness (the brightness value 90), and the ratio of the on-brightness (the low potential) increases.
In addition, the duty pulse signals D corresponding to the respective luminance values are different, and referring to fig. 5, the duty pulse signals D corresponding to the luminance values 88 to 90 are different, and the time span represented by one pulse period of the duty pulse signal D is the same, and the difference is the ratio of the on-potential to the off-potential, and in fig. 5, the duty pulse signal D increases from the low luminance (luminance value 88) to the high luminance (luminance value 90), and the ratio of the on-luminance (low potential) increases.
104, sending the driving pulse signal to the array substrate driving unit so that the array substrate driving unit controls the light-emitting module to emit light by adopting the driving pulse signal; wherein the driving pulse signal includes: a first pulse period; the first off potential of the first pulse period is a first preset width.
In an embodiment of the present invention, the display panel further includes a processor, and the processor is connected to the GOA and configured to transmit a signal to the GOA. When the display panel starts to display, the processor provides a driving pulse signal to the array substrate driving unit GOA, and the array substrate driving unit GOA drives the pixels 11 in each row by using the driving pulse signal according to a time sequence. The driving pulse signal may also be a signal for turning on the GOA.
Specifically, each GOA has a corresponding driving pulse signal under different brightness values, and the GOA corresponds to a turn-off potential requiring the minimum width, and only if the first preset width is greater than or equal to the minimum width, the GOA can be turned on to operate. In the PWM dimming interval, when the brightness value is maximum, the width corresponding to the off potential of the pulse period is required to be minimum, so that the first preset width corresponding to the maximum brightness value may be set to be minimum in the PWM dimming interval, and then the corresponding first preset width is increased as the brightness value decreases. Thus, each brightness value has a corresponding first preset width.
For example, in fig. 5, the first predetermined width corresponding to the luminance value 90 is w1c, the first predetermined width corresponding to the luminance value 89 is w2c, and the first predetermined width corresponding to the luminance value 88 is w3c. Wherein w1c < w2c < w3c.
Further, referring to fig. 5, the driving pulse signal includes a first pulse period C, and the first pulse period C is the first pulse signal in one frame, or may be the first pulse signal in the first frame in all the frame.
105, sending the working pulse signal to the array substrate driving unit so that the array substrate driving unit controls the light-emitting module to emit light by adopting the working pulse signal; wherein the operating pulse signal includes: a plurality of second pulse periods; the second off potentials of the plurality of second pulse periods are a second preset width; the second preset width is smaller than the first preset width.
In the embodiment of the present invention, the working pulse signal is immediately after the driving pulse signal, and when the driving pulse signal drives the GOA to be turned on, the working pulse signal is subsequently used to start working.
Specifically, when the number of pulses of one frame is X, the pulse signal of the first frame is composed of one first pulse period C and X-1 second pulse periods D. The pulse signals corresponding to the 2 nd frame to the nth frame may all be X second pulse periods D, or may be the same as the pulse signal of the first frame.
In the embodiment of the present invention, referring to 5,A, the ratio of the on potential (low potential) to the off potential (high potential) in one frame is denoted, and B is the number of pulse periods in one frame; in the brightness values 88-90, PWM dimming is adopted, wherein as the brightness value increases, the ratio of the on potential (low potential) and the off potential (high potential) corresponding to A increases, and the brightness increases; b is smaller in the first off potential in the first pulse period, and is smaller in the second off potential in the second pulse period. However, for the same brightness value, the width of the off-first off-potential of the first pulse period is larger than the width of the second off-potential of the second pulse period.
Specifically, in fig. 5, w3c > w2c > w1c; w3c > w3d; w2c > w2d; w1c > w1d.
Wherein, before step 101, further comprising: acquiring the starting closing potential width and the working closing potential width of the array substrate driving unit; acquiring the number of pulses in unit time; determining the pulse period width according to the unit time and the pulse number; determining a driving pulse signal corresponding to the brightness value threshold according to the pulse period width and the starting and closing potential width; and determining a working pulse signal corresponding to the brightness value threshold according to the pulse period width and the working closing potential width.
Specifically, the start-up off potential width and the working off potential width are inherent properties of the array substrate driving unit. The starting and closing potential width refers to the width of the minimum closing potential in the pulse which can be started by the array substrate driving unit; only when the first preset width of the starting pulse signal is larger than or equal to the starting and closing potential width, a sufficient preparation time can be provided for the subsequent working pulse signal, and the display panel cannot be abnormal after being opened. The working closing potential width refers to the lowest width that the closing potential can reach in a pulse period when the array substrate driving unit can work normally, and the array substrate driving unit has enough time to complete charging and discharging when the second preset width is larger than or equal to the working closing potential width, so that the display panel works normally.
Further, the unit time refers to a time required for refreshing one frame of picture. In fig. 5, the number of pulses per unit time is 12. Determining a pulse period width based on the unit time and the number of pulses comprises: dividing unit time by the number of pulses to obtain pulse period width; determining a driving pulse signal corresponding to the brightness value threshold according to the pulse period width and the start-up and shut-down potential width, including: the pulse period width minus the start-up and shut-down potential width is equal to the start-up and shut-down potential width, and the start-up and shut-down potential width (low potential) and the start-up and shut-down potential width form a driving pulse signal C. Determining the working pulse signal corresponding to the brightness value threshold according to the pulse period width and the working off potential width comprises: the pulse period width minus the work-off potential width is equal to the work-on potential width, and a work-off potential width (high potential) and a work-on potential width (low potential) form a second pulse period D; the second pulse periods form a working pulse signal.
In fig. 5, when the luminance value threshold is 90, the pulse signals (the driving pulse signal and the operating pulse signal) corresponding to the luminance value threshold are the signal lines corresponding to B in fig. 5 at 90.
In the present embodiment, the width refers to a duration of time, for example, the operation off potential width refers to a duration of time of the operation off potential.
In addition, the method further comprises the following steps: determining a first difference value between each of the brightness values and the brightness value threshold within the second dimming interval; determining a driving pulse signal corresponding to each brightness value according to the first difference value, the starting and closing potential width and the pulse period width; and determining the working pulse signal corresponding to each brightness value according to the first difference value, the working closing potential width and the pulse period width.
In addition, from the brightness value threshold to the brightness value 0, the corresponding first preset width and the second preset width are increased progressively; and the difference value of the first preset widths corresponding to the adjacent brightness values is a second difference value, the difference value of the second preset widths corresponding to the adjacent brightness values is a third difference value, and the second difference value is equal to the third difference value.
The driving pulse signal corresponding to the determined brightness value may be that the first preset width corresponding to the brightness value is: and subtracting the first preset width from the pulse period width to obtain a driving pulse signal corresponding to the opening potential width (low potential width), wherein the opening potential and the closing potential of the first preset width form the driving pulse signal. The working pulse signal is determined in the same manner, which is not described in detail herein.
Specifically, the start-up/shut-down potential width and the operation/shut-down potential width are both stored in the display panel, and the processor can acquire the start-up/shut-down potential width and the operation/shut-down potential width. In addition, in the embodiment of the present invention, the GOA has a corresponding start-up and shut-down potential width, and when the first preset width is greater than or equal to the start-up and shut-down potential width, the GOA can be turned on; the GOA also has a corresponding working closing potential width, and the GOA can work only if the second preset width is larger than the working closing potential width; and the start-up off potential width is greater than the operational off potential width. Therefore, in the PWM dimming interval, the first preset width corresponding to the maximum brightness value is set as the starting off potential width, the second preset width is set as the working off potential width, and then the first preset width gradually increases and the second preset width also gradually increases along with the decrease of the brightness value.
For example, in fig. 5, in the PWM dimming interval, the maximum brightness value is 90, the first preset width w1c corresponding to the brightness value 90 is set as the first off potential, and the second preset width w1d is set as the second off potential. Wherein w2c-w1c = w2d-w1d; w3c-w2c = w2c-w1c; w3d-w2d = w2d-w1d.
In the embodiment of the present invention, referring to line 6,X, it represents the ratio change of the on-potential in unit time with the increase of the brightness value provided by the embodiment of the present invention; y is the ratio change of the on-potential in unit time along with the increase of the brightness in the prior art; it can be seen that in the prior art, since the brightness value threshold 90 is changed to the brightness value 91 of the DC dimming, the dimming has a problem of flickering due to the abrupt change of the duty ratio of the on-potential. In the embodiment of the invention, the duty ratio of the on potential is improved by reducing the width of the working off potential, so that when the brightness value threshold 90 is changed to the brightness value 91 of the DC dimming, the change of the on potential is small, and sudden change does not occur, thereby solving the problem of flicker.
Specifically, in the prior art, referring to a potential diagram corresponding to 120HZ (c) in fig. 2, since each pulse period is equally large, the maximum ratio of the on potential to be achieved per unit time is E1= (L-S × w 1)/L; wherein, L is the pulse period width, S is the pulse number in unit time, and w1 is the starting and closing potential width.
In the embodiment of the present invention, referring to fig. 5, in a potential diagram B corresponding to the brightness level 90, the maximum duty ratio that the on-potential can reach in the unit time is E2= [ L-w1- (S-1) × w2]/L, where w2 is the working off-potential width, and since w2 is smaller than w1, E2 > E1 can further increase the duty ratio of the on-potential in the unit time corresponding to the brightness value threshold, so that when the PWM adjustment is suddenly changed to the DC adjustment, the duty ratio of the on-potential in the unit time is not too large, and the problem of flicker is avoided.
Further, in fig. 4, the light emitting unit 11 includes a first thin film transistor T1, a second thin film transistor T2, and a third thin film transistor T3, a light emitting diode OLED; the first pole of the light emitting diode OLED is grounded, and the second pole of the light emitting diode OLED is connected with the source electrode of the second thin film transistor; the gate EM of the second thin film transistor is connected to the first dimming module 20 or the second dimming module 30. The source electrode of the first thin film transistor is connected with the second thin film transistor; the GOA controls the light emitting of the light emitting diode and the light emitting brightness by controlling the connection and disconnection of the second thin film transistor T2; the direct current power supply controls the brightness of the light emitted by the light emitting diode by controlling the voltage input to the second thin film transistor.
Referring to fig. 7, a schematic diagram of a signal input in the light emitting unit 11 is shown. In the first dimming interval, a voltage having a different value is input to the gate of the second thin film transistor T2 by the direct current power supply (DC) dimming, and in the first dimming interval, the pulse frequency of the voltage signal input to the second thin film transistor is maintained at 1, the high level ratio is not changed, only the input voltage value is changed, and the voltage value is increased as the luminance level is decreased. In the second dimming interval, a pulse signal is input to the second thin film transistor EM by Pulse Width Modulation (PWM) dimming, and the low-level duty of the input pulse signal decreases as the luminance value decreases.
The embodiment of the invention provides a dimming method of a display panel, wherein the display panel comprises the following steps: the array substrate driving unit is connected with the light emitting module; the method comprises the following steps: receiving a first input of a user; responding to the first input and determining a target brightness value selected by the first input; acquiring a driving pulse signal and a working pulse signal corresponding to the target brightness value; sending the driving pulse signal to the array substrate driving unit so that the array substrate driving unit controls the light emitting module to emit light by adopting the driving pulse signal; wherein the driving pulse signal includes: a first pulse period; the first off potential of the first pulse period is a first preset width; sending the working pulse signal to the array substrate driving unit so that the array substrate driving unit controls the light-emitting module to emit light by adopting the working pulse signal; wherein the operating pulse signal includes: a plurality of second pulse periods; the second off potentials of the plurality of second pulse periods are a second preset width; the second preset width is smaller than the first preset width. In the embodiment of the invention, by setting the working pulse signal and the driving pulse signal and setting the second preset width of the second off potential of the second pulse period to be smaller than the first preset width of the first off potential of the first pulse period, during the PWM modulation, after the first preset width meets the driving requirement of the driving array substrate driving unit, the width of the off potential of the working pulse signal can be continuously reduced, so that the duty ratio of the on potential can be improved, and the sudden change of the duty ratio of the on potential when the PWM modulation is changed to the DC modulation can be avoided, thereby avoiding the problem of flicker.
Example two
Referring to fig. 8, a schematic structural diagram of a dimming device 200 of a display panel according to an embodiment of the present invention is shown, and referring to fig. 3, the display panel includes: the array substrate driving device comprises an array substrate driving unit 20 and a light emitting module 10, wherein the array substrate driving unit 20 is connected with the light emitting module 10; the dimming device includes:
a receiving module 201, configured to receive a first input of a user;
a first determining module 202, configured to respond to the first input and determine a target brightness value selected by the first input;
a first obtaining module 203, configured to obtain a driving pulse signal and a working pulse signal corresponding to the target brightness value;
the first driving module 204 is configured to send the driving pulse signal to the array substrate driving unit, so that the array substrate driving unit controls the light emitting module to emit light by using the driving pulse signal; wherein the driving pulse signal includes: a first pulse period; the first off potential of the first pulse period is a first preset width;
the second driving module 205 is configured to send the working pulse signal to the array substrate driving unit, so that the array substrate driving unit controls the light emitting module to emit light by using the working pulse signal; wherein the operating pulse signal includes: a plurality of second pulse periods; the second off potentials of the plurality of second pulse periods are a second preset width; the second preset width is smaller than the first preset width.
Optionally, the display panel further comprises: a direct current power supply dimming module 30; the method further comprises the following steps:
the second obtaining module is used for obtaining a voltage signal corresponding to the target brightness value if the target brightness value belongs to a first dimming interval;
the control module is used for controlling the direct-current power supply dimming module to dim the light emitting module by adopting the voltage signal;
and the execution module is used for executing the step of acquiring the driving pulse signal and the working pulse signal corresponding to the target brightness value if the target brightness value belongs to a second dimming interval.
Optionally, the method further comprises:
the first setting module is used for setting a brightness value from 0 to N and a brightness value threshold;
the second setting module is used for setting the interval between the brightness value threshold and the brightness value N as a first dimming interval;
and the third setting module is used for setting the interval between the brightness value 0 and the brightness value threshold value as a second dimming interval.
Optionally, the method further comprises:
the third acquisition module is used for acquiring the starting closing potential width and the working closing potential width of the array substrate driving unit;
the fourth acquisition module is used for acquiring the number of pulses in unit time;
the second determining module is used for determining the pulse period width according to the unit time and the pulse number;
a third determining module, configured to determine, according to the pulse period width and the start-up/shut-down potential width, a driving pulse signal corresponding to the brightness value threshold;
and the fourth determining module is used for determining a working pulse signal corresponding to the brightness value threshold according to the pulse period width and the working closing potential width.
Optionally, the method further comprises:
a fifth determining module, configured to determine a first difference between each of the brightness values in the second dimming interval and the brightness value threshold;
a sixth determining module, configured to determine, according to the first difference, the start-up/shut-down potential width, and the pulse period width, a driving pulse signal corresponding to each brightness value;
and the seventh determining module is used for determining the working pulse signal corresponding to each brightness value according to the first difference value, the working closing potential width and the pulse period width.
Optionally, from the brightness value threshold to the brightness value 0, the corresponding first preset width and the second preset width are increased progressively; and the difference value of the first preset width corresponding to the adjacent brightness value is a second difference value, the difference value of the second preset width corresponding to the adjacent brightness value is a third difference value, and the second difference value is equal to the third difference value.
The embodiments of the present invention may be applied to any combination method in the first embodiment, and details are not described herein with specific reference to the first embodiment.
In the dimming device for a display panel according to the embodiment of the present invention, by setting the working pulse signal and the driving pulse signal, and setting the second preset width of the second off potential in the second pulse period to be smaller than the first preset width of the first off potential in the first pulse period, during PWM dimming, after the first preset width meets the driving requirement of the driving array substrate driving unit, the width of the off potential of the working pulse signal can be continuously reduced, so that the duty ratio of the on potential can be increased, and the duty ratio of the on potential is prevented from being suddenly changed when PWM dimming is performed to DC dimming, thereby preventing the flicker problem.
An embodiment of the present invention further provides an electronic device, which includes a processor, a memory, and a program or an instruction stored in the memory and executable on the processor, and when the program or the instruction is executed by the processor, the method according to the first embodiment is implemented.
Embodiments of the present invention further provide a readable storage medium, on which a program or instructions are stored, which when executed by a processor implement the steps of the method according to the first embodiment.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The above description is intended to be illustrative of the preferred embodiment of the present invention and should not be taken as limiting the invention, but rather, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A dimming method of a display panel, the display panel comprising: the array substrate driving unit is connected with the light emitting module; the method comprises the following steps:
receiving a first input of a user;
responding to the first input and determining a target brightness value selected by the first input;
acquiring a driving pulse signal and a working pulse signal corresponding to the target brightness value;
sending the driving pulse signal to the array substrate driving unit so that the array substrate driving unit controls the light emitting module to emit light by adopting the driving pulse signal; wherein the driving pulse signal includes: a first pulse period; the first off potential of the first pulse period is a first preset width;
sending the working pulse signal to the array substrate driving unit so that the array substrate driving unit controls the light-emitting module to emit light by adopting the working pulse signal; wherein the operating pulse signal includes: a plurality of second pulse periods; the second off potentials of the plurality of second pulse periods are a second preset width; the second preset width is smaller than the first preset width.
2. The dimming method according to claim 1, wherein the display panel further comprises: a direct-current power supply dimming module; before the step of obtaining the driving pulse signal and the working pulse signal corresponding to the target brightness value, the method further includes:
if the target brightness value belongs to a first dimming interval, acquiring a voltage signal corresponding to the target brightness value;
controlling the direct-current power supply dimming module to dim the light of the light emitting module by adopting the voltage signal;
and if the target brightness value belongs to a second dimming interval, executing the step of acquiring the driving pulse signal and the working pulse signal corresponding to the target brightness value.
3. The dimming method of claim 2, further comprising:
setting a brightness value from 0 to N and a brightness value threshold;
setting a first dimming interval between a brightness value threshold and a brightness value N;
and setting the interval between the brightness value 0 and the brightness value threshold as a second dimming interval.
4. The dimming method of claim 3, wherein the step of receiving the first input from the user is preceded by the step of:
acquiring the starting closing potential width and the working closing potential width of the array substrate driving unit;
acquiring the number of pulses in unit time;
determining the pulse period width according to the unit time and the pulse number;
determining a driving pulse signal corresponding to the brightness value threshold according to the pulse period width and the starting and closing potential width;
and determining a working pulse signal corresponding to the brightness value threshold according to the pulse period width and the working closing potential width.
5. The dimming method of claim 4, further comprising:
determining a first difference value between each of the brightness values and the brightness value threshold within the second dimming interval;
determining a driving pulse signal corresponding to each brightness value according to the first difference value, the starting and closing potential width and the pulse period width;
and determining the working pulse signal corresponding to each brightness value according to the first difference value, the working closing potential width and the pulse period width.
6. The dimming method according to claim 4, wherein the first preset width and the second preset width are increased from the brightness value threshold to the brightness value 0; and the difference value of the first preset width corresponding to the adjacent brightness value is a second difference value, the difference value of the second preset width corresponding to the adjacent brightness value is a third difference value, and the second difference value is equal to the third difference value.
7. A dimming device for a display panel, the display panel comprising: the array substrate driving unit is connected with the light emitting module; the dimming device includes:
the receiving module is used for receiving a first input of a user;
the first determining module is used for responding to the first input and determining a target brightness value selected by the first input;
the first acquisition module is used for acquiring a driving pulse signal and a working pulse signal corresponding to the target brightness value;
the first driving module is used for sending the driving pulse signal to the array substrate driving unit so that the array substrate driving unit controls the light-emitting module to emit light by adopting the driving pulse signal; wherein the driving pulse signal includes: a first pulse period; the first off potential of the first pulse period is a first preset width;
the second driving module is used for sending the working pulse signal to the array substrate driving unit so that the array substrate driving unit controls the light-emitting module to emit light by adopting the working pulse signal; wherein the operating pulse signal includes: a plurality of second pulse periods; the second off potentials of the plurality of second pulse periods are a second preset width; the second preset width is smaller than the first preset width.
8. The dimming device of claim 7, wherein the display panel further comprises: a direct-current power supply dimming module; further comprising:
the second obtaining module is used for obtaining a voltage signal corresponding to the target brightness value if the target brightness value belongs to a first dimming interval;
the control module is used for controlling the direct-current power supply dimming module to dim the light-emitting module by adopting the voltage signal;
and the execution module is used for executing the step of acquiring the driving pulse signal and the working pulse signal corresponding to the target brightness value if the target brightness value belongs to a second dimming interval.
9. The dimming device of claim 8, further comprising:
the first setting module is used for setting a brightness value from 0 to N and a brightness value threshold;
the second setting module is used for setting the interval between the brightness value threshold and the brightness value N as a first dimming interval;
and the third setting module is used for setting the interval between the brightness value 0 and the brightness value threshold value as a second dimming interval.
10. The dimming device of claim 9, further comprising:
the third acquisition module is used for acquiring the starting closing potential width and the working closing potential width of the array substrate driving unit;
the fourth acquisition module is used for acquiring the number of pulses in unit time;
the second determining module is used for determining the pulse period width according to the unit time and the pulse number;
a third determining module, configured to determine, according to the pulse period width and the start-up/shut-down potential width, a driving pulse signal corresponding to the brightness value threshold;
and the fourth determining module is used for determining a working pulse signal corresponding to the brightness value threshold according to the pulse period width and the working closing potential width.
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