Driving method and driving device of display panel and display device

Abstract

The invention discloses a driving method and device of a display panel and a display device.The driving method comprises the steps that according to the target pulse number of a light-emitting control signal of the display panel in one frame and the scanning line number of the display panel, the line number of pulse displacement of a driving signal output by a driving chip corresponding to the display panel is determined; one standard pulse number is selected from all standard pulse numbers capable of being output by the driving chip to serve as the actual pulse number adopted by the driving signal; the selected standard pulse number is greater than the target pulse number; and outputting the driving signal to a light-emitting control circuit which generates the light-emitting control signal according to the line number of the pulse shift and the actual pulse number adopted by the driving signal. The scheme that the driving chip supports the similar and large standard pulse number capable of being directly output to intercept the target pulse number is adopted, the duty ratio change rule is maintained when the original display brightness value is adjusted, and the dimming precision is optimized.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a driving method and a driving device of a display panel and a display device. Background Art

[0002] In recent years, in order to achieve eye protection for display screens and better visual effects at lower brightness, direct current dimming (DC) and pulse width modulation (PWM) are often used as driving schemes for display panels.

[0003] However, when the PWM dimming method is used to drive the display panel, the dimming accuracy is low. Summary of the invention

[0004] The present invention provides a display panel driving method, a driving device and a display device to solve the problem of low dimming accuracy during PWM dimming.

[0005] According to one aspect of the present invention, there is provided a method for driving a display panel, comprising:

[0006] Determine the number of rows of pulse shift of the driving signal output by the driving chip corresponding to the display panel according to the target number of pulses of the light emitting control signal of the display panel in one frame and the number of scanning rows of the display panel;

[0007] Selecting a standard pulse number from all standard pulse numbers that can be output by the driving chip as the actual pulse number used by the driving signal; the selected standard pulse number is greater than the target pulse number;

[0008] The driving signal is output to a light emitting control circuit that generates the light emitting control signal according to the number of rows of the pulse shift and the actual number of pulses used by the driving signal.

[0009] Optionally, determining the number of rows of pulse shift of the driving signal output by the driving chip corresponding to the display panel according to the target number of pulses of the light emitting control signal of the display panel in one frame and the number of scanning rows of the display panel comprises:

[0010] The ratio of the number of scan lines of the display panel to the target number of pulses is used as the number of lines for pulse shifting;

[0011] Outputting the driving signal to the light emitting control circuit that generates the light emitting control signal according to the number of rows of the pulse shift and the actual number of pulses used by the driving signal comprises:

[0012] The product of the number of rows of the pulse shift and the actual number of pulses used is configured in the driving chip as a preset number of scanning rows;

[0013] The driving signal is output to a light emitting control circuit that generates the light emitting control signal according to the preset number of scanning lines and the actual number of pulses used.

[0014] Optionally, the selected standard pulse number is the number that is closest to and greater than the target pulse number among all standard pulse numbers that can be output by a driving chip corresponding to the display panel.

[0015] Optionally, the display panel includes m display brightness values ​​that increase in sequence, and the driving method of the display panel further includes:

[0016] The display panel is driven to display using a pulse width modulation mode. When the display panel is adjusted from the nth display brightness value to the n+ith display brightness value, the width of each pulse in the i pulses in the driving signal is increased by a preset width; m, n and i are all positive integers, and n and i are both less than m.

[0017] Optionally, when i is greater than or equal to 2, any two pulses among the i pulses selected to increase the preset width are not adjacent.

[0018] Optionally, the pulse width modulation mode is used to drive the display panel for display, and when the display panel is adjusted from the nth display brightness value to the n+ith display brightness value, increasing the width of each pulse of i pulses in the driving signal by a preset width includes:

[0019] According to a preset corresponding relationship, i pulses corresponding to each display brightness value except the nth display brightness value from the nth display brightness value to the n+ith display brightness value are selected from all pulses of the driving signal; the preset corresponding relationship is a corresponding relationship between each display brightness value except the first display brightness value among the m display brightness values ​​and a pulse with an increased preset width;

[0020] Increasing the width of each of the selected i pulses by a preset width;

[0021] Optionally, the driving signal includes h pulse groups, and each pulse group includes the same number of pulses, and the product of the number of pulses included in each pulse group and the number of pulse groups is equal to the actual number of pulses; h is a positive integer; the display panel includes a plurality of cycle groups, wherein, among the m display brightness values, each h display brightness values ​​except the first display brightness value is a cycle group;

[0022] The process of establishing the preset corresponding relationship includes:

[0023] For each of the cycle groups:

[0024] Selecting a pulse from each of the pulse groups to increase the preset width, so as to sequentially increase the h*k+1th display brightness value to the h*k+h+1th display brightness value; k is an integer greater than or equal to 0;

[0025] In different cycle groups, for the same pulse group, the pulses with the preset width added are different.

[0026] Optional, for the jth loop group:

[0027] Selecting the jth pulse in each of the pulse groups to increase the preset width, so as to sequentially increase the h*k+1th display brightness value to the h*k+h+1th display brightness value;

[0028] Optionally, h=4.

[0029] Optionally, the driving method of the display panel further includes:

[0030] When the pulse with the preset width is any pulse from the gth pulse to the last pulse in the driving signal, the display panel is driven to display in a DC dimming mode; wherein g is equal to the difference between the actual number of pulses and the target number of pulses.

[0031] According to another aspect of the present invention, there is provided a driving device for a display panel, comprising:

[0032] A pulse shift row number determination module, used to determine the number of rows of pulse shift of the driving signal output by the driving chip corresponding to the display panel according to the target number of pulses of the light emitting control signal of the display panel in one frame and the number of scanning rows of the display panel;

[0033] An actual pulse number selection module, used to select a standard pulse number from all standard pulse numbers that can be output by the driving chip as the actual pulse number used by the driving signal;

[0034] The output module is used to output the driving signal to the light emitting control circuit that generates the light emitting control signal according to the number of rows of the pulse shift and the actual number of pulses used by the driving signal.

[0035] According to another aspect of the present invention, a display device is provided, including a display panel, a driving chip, and a driving device for the display panel.

[0036] In this embodiment, the driving chip supports the direct output of a driving signal with a standard pulse number that is close to and greater than the target pulse number, and generates a light-emitting control signal to drive the display panel to display, thereby achieving the same visual effect as when the light-emitting control signal generated by the driving signal with the target pulse number is used to drive the display panel to display. In addition, when the light-emitting control signal generated in this embodiment is adjusted from one display brightness value to another adjacent display brightness value, it is only necessary to adjust the width of one pulse, and the duty cycle change rule is maintained when the original display brightness value is adjusted, thereby optimizing the dimming accuracy.

[0037] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 A timing diagram for implementing a dimming solution using pulse replication;

[0040] Figure 2 A flow chart of a method for driving a display panel provided by an embodiment of the present invention;

[0041] Figure 3 A timing diagram of a light emitting control signal of a display panel provided by an embodiment of the present invention;

[0042] Figure 4 A simulation diagram of the smoothness of display brightness values ​​obtained by using a pulse replication scheme;

[0043] Figure 5 This is a simulation diagram of the smoothness of the display brightness value obtained by using the pulse interception solution;

[0044] Figure 6 A schematic structural diagram of a driving device for a display panel provided by an embodiment of the present invention;

[0045] Figure 7 A schematic structural diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0047] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0048] As described in the background technology, the existing PWM dimming method has poor accuracy. The inventors have found that the reason is that when the driver chip does not meet the requirement of directly outputting the drive signal of the target number of pulses, a scheme of replicating the number of pulses with appropriate common factor multiples is adopted, resulting in poor dimming accuracy. The display panel includes a light-emitting control circuit, which includes a cascade-connected shift register. The first-stage shift register is connected to the drive signal to shift the drive signal to generate a light-emitting control signal and output it to the sub-pixel. The target number of pulses is the number of pulses of the light-emitting control signal in one frame. Take the refresh rate of the display panel as 120Hz, and the light control signal in one frame includes 36 pulses, that is, the dimming frequency is 4320Hz. Because the driver chip corresponding to the display panel cannot support the output of signals with any number of pulses, such as the RM692H5 chip only supports the output of signals with 1-6, 8, 9, 10, 12, 16, 18, 24, 32, 48, 64 pulses, if this type of driver chip is used to implement a dimming solution with a dimming frequency of 4320Hz, the driver chip does not support the direct generation of a drive signal with 36 pulses. The current solution is to use a 12-pulse signal, that is, a 12-pulse signal, to directly output it, and then copy it twice to get 36 pulses. You can refer to Figure 1 . Figure 1This is a timing diagram of a dimming scheme using pulse replication. When the pulse replication method is used to realize the signal output of 36 pulses, that is, 36 pulses, if the display panel is adjusted from the current nth display brightness level Dn-1 to the adjacent n+1th display brightness level Dn, that is, when the duty cycle of the light-emitting control signal changes, the width of one pulse in the 12 pulses increases by the width corresponding to the black insertion of 4H, then the actual pulse width changed in the entire 36 pulses is the width corresponding to 4H*3=12H, which seriously deteriorates the PWM dimming accuracy. Among them, H is the time required to scan a row of sub-pixels in the display panel, and 4H is the minimum unit of the number of black insertion rows affected by the light-emitting control circuit.

[0049] In response to the above technical problems, the present invention provides a method for driving a display panel, which uses a driving signal that can be directly output by a driving chip and has a pulse number greater than a target number to generate a light-emitting control signal to drive the display panel to display, and achieves the same display effect as when the display panel is driven by a light-emitting control signal generated by a driving signal with a pulse number equal to the target number within a frame, thereby optimizing the dimming accuracy.

[0050] Figure 2 A flowchart of a method for driving a display panel provided by an embodiment of the present invention, referring to Figure 2 , the method comprising:

[0051] S110: Determine the number of rows of pulse shift of the driving signal output by the driving chip corresponding to the display panel according to the target number of pulses of the light emitting control signal of the display panel in one frame and the number of scanning rows of the display panel.

[0052] The display panel includes a plurality of sub-pixels, each of which includes a light-emitting device and a pixel driving circuit connected to the light-emitting device, and the pixel driving circuit is used to respond to a light-emitting control signal to control the light-emitting device to emit light in the light-emitting stage. The target pulse number is the number of pulses required by the light-emitting control signal in one frame. The number of scanning lines of the display panel is the actual number of sub-pixel rows set by the display panel for display. The display panel also includes a light-emitting control circuit, which includes a plurality of shift registers connected in cascade in sequence, and the signal output by the output end of the previous shift register is used as the signal input by the input end of the next shift register. Each shift register is also connected to at least one row of sub-pixel rows, which is used to output a light-emitting control signal to the connected sub-pixels. The driving signal output by the driving chip is used as a signal connected to the input end of the first shift register, and the first shift register is used to generate a light-emitting control signal after shifting the driving signal and output it to the corresponding connected sub-pixel row. According to the target pulse number of the light-emitting control signal of the display panel in one frame and the number of scanning lines of the display panel, the number of rows of pulse shift of the driving signal is determined through a certain corresponding relationship. Among them, the number of rows of pulse shift can be understood as the time period between the start time of the ath pulse output by the light control signal corresponding to the first row of sub-pixel rows (the first scanned sub-pixel row in one frame) in one frame and the start time of the a+1th pulse, and the light control signal of the sub-pixel rows of b rows outputs the ath pulse, and b rows are the number of rows of shifted pulses. Exemplarily, the light control signal corresponding to the second row of sub-pixel rows outputs the first pulse after a delay of a set time after the start time of the light control signal corresponding to the first row of sub-pixel rows outputting the first pulse, and the light control signal corresponding to the third row of sub-pixel rows outputs the first pulse after a delay of a set time after the start time of the light control signal corresponding to the second row of sub-pixel rows outputting the first pulse, and so on. If the number of rows of pulse shift is 50 rows, the light control signal corresponding to the first row of sub-pixel rows outputs the second pulse at the start time of the light control signal corresponding to the first row of sub-pixel rows outputting the second pulse, and the light control signal corresponding to the 51st row of sub-pixel rows outputs the first pulse after a delay of a set time after the start time of the light control signal corresponding to the first row of sub-pixel rows outputting the second pulse.

[0053] S120: Selecting a standard pulse number from all standard pulse numbers that can be output by the driving chip as the actual pulse number used by the driving signal; the selected standard pulse number is greater than the target pulse number.

[0054] The number of standard pulses that the driver chip can output is limited by the model of the driver chip. Once the model of the driver chip is determined, the number of all standard pulses that it can directly output can be determined. Exemplarily, the driver chip uses RM692H5, and this model of driver chip supports the output of 1-6, 8, 9, 10, 12, 16, 18, 24, 32, 48, and 64 pulses. If the target number of pulses is 36, the actual number of pulses can be selected as 48 or 64. Optionally, the selected number of standard pulses is the number of all standard pulses that the driver chip corresponding to the display panel can output that is closest to and greater than the target number of pulses. In this embodiment, 48 of 48 and 64 that meet the requirements can be selected.

[0055] S130: Outputting a driving signal to a light emitting control circuit that generates a light emitting control signal according to the number of rows of pulse shift and the actual number of pulses used by the driving signal.

[0056] The relevant parameters in the driver chip are configured according to the actual number of pulses used and the number of rows of pulse shifts to ensure that the number of rows of pulse shifts of the luminous control signal generated by the driving signal using the actual number of pulses is the same as the number of rows of pulse shifts of the luminous control signal generated by the driving signal directly using the target number of pulses, thereby ensuring that the visual effect of the display panel driven by the luminous control signal generated by the actual number of pulses is the same as the visual effect of the display panel driven by the luminous control signal generated by the target number of pulses, thereby realizing that the luminous control signal generated by the driving signal using the actual number of pulses includes the target number of pulses in one frame. Optionally, after the driving signal output to the luminous control circuit outputs the target number of pulses, the driving signal is reset so that the driving signal re-outputs the first pulse, thereby realizing the use of the driver chip to support the direct output of a similar and larger standard pulse number to intercept the target number of pulses.

[0057] Exemplarily, the display panel includes m display brightness values. Between adjacent display brightness values, when adjusting the previous display brightness value to the next display brightness value, it is only necessary to increase the width of a pulse of the driving signal at the previous display brightness value by a preset width to adjust it to the next display brightness value. The preset width is the minimum width value that can be adjusted subject to the limitation of the relevant circuit. Compared with the scheme of pulse replication in the prior art, the scheme of realizing the signal output of any number of pulses has an adjustment accuracy of A*N, where A is the preset width and N is the number of replications. In this embodiment, a scheme of intercepting the target pulse number by a driver chip that supports a similar and larger standard pulse number that can be directly output is adopted. When the original display brightness value is adjusted, the duty cycle variation law is maintained, and the dimming accuracy is maintained at A, thereby optimizing the dimming accuracy.

[0058] In this embodiment, the driving chip supports the direct output of a driving signal with a standard pulse number that is close to and greater than the target pulse number, and generates a light-emitting control signal to drive the display panel to display, thereby achieving the same visual effect as when the light-emitting control signal generated by the driving signal with the target pulse number is used to drive the display panel to display. In addition, when the light-emitting control signal generated in this embodiment is adjusted from one display brightness value to another adjacent display brightness value, it is only necessary to adjust the width of one pulse, and the duty cycle change rule is maintained when the original display brightness value is adjusted, thereby optimizing the dimming accuracy.

[0059] Optionally, S110 further includes:

[0060] The ratio of the number of scan lines of the display panel to the number of target pulses is taken as the number of lines of pulse shift.

[0061] Figure 3 A timing diagram of a light emitting control signal of a display panel provided in an embodiment of the present invention, referring to Figure 3 , Figure 3 Only the timing of the light-emitting control signal EM1 corresponding to the first row of sub-pixel rows in one frame, the timing of the light-emitting control signal EM2 corresponding to the second row of sub-pixel rows in one frame, ..., and the timing of the light-emitting control signal EM81 corresponding to the eighty-first row of sub-pixel rows in one frame are shown as an example. Exemplarily, the display panel is driven to display at 120Hz and 36 pulses, that is, the light-emitting control signal in one frame includes 36 pulses, and the target number of pulses is 36. The number of scanning rows of the display panel is 2880 rows, that is, the actual number of sub-pixel rows included in the display panel is 2880 rows, and the number of rows of pulse shifting is equal to 2880 / 36=80. Specifically, one pulse is shifted every 80 rows, and between the starting time when the first row of sub-pixel rows outputs the first pulse and the starting time when the first row of sub-pixel rows outputs the second pulse, the second row to the eightieth row of sub-pixel rows are sequentially shifted and output relative to the starting time when the first row of sub-pixel rows outputs the first pulse. The eighty-first row of sub-pixel rows is shifted and output relative to the starting time of the second pulse output by the first row of sub-pixel rows, and so on.

[0062] Optionally, S130 further includes:

[0063] The product of the number of pulse shift rows and the actual number of pulses used is configured as a preset scanning row number in the driver chip; the driver chip outputs a driving signal to a light control circuit that generates a light control signal according to the preset scanning row number and the actual number of pulses used.

[0064] In order to ensure that the visual effect produced by the luminous control signal generated by the driving signal using the actual number of pulses and the luminous control signal generated by the driving signal using the target number of pulses are the same after being input into the sub-pixel, it is necessary to ensure that the number of rows of pulse shifts of the two is the same. For example, if the target number of pulses is 36 and the number of scanning lines of the display panel is 2880, the corresponding number of rows of pulse shifts is 80. Accordingly, the actual number of pulses is 48, and the preset number of scanning lines of the display panel should be set to 48*80=3840, so as to ensure that the number of rows of pulse shifts corresponding to the luminous control signal generated by the driving signal with the output number of pulses of 48 is also 80. After determining the preset number of scanning lines, the actual number of pulses and the preset number of scanning lines are configured in the driver chip, and the driver chip controls the number of rows of pulse shifts of the luminous control signal generated by the driving signal to be 80 rows according to the above two configured parameters.

[0065] Optionally, the display panel includes m display brightness values ​​that increase in sequence, and the driving method of the display panel further includes:

[0066] The display panel is driven by a pulse width modulation mode. When the display panel is adjusted from the nth display brightness value to the n+ith display brightness value, the width of each pulse in the i pulses in the driving signal is increased by a preset width; m, n and i are all positive integers, and n and i are both less than m.

[0067] Exemplarily, the preset width is the minimum width that can be increased by the light-emitting control circuit. When two adjacent display brightness values ​​are adjusted from a smaller display brightness value to a larger display brightness value, at the smaller display brightness value, a pulse is selected to increase the preset width to adjust to the larger display brightness value. Exemplarily, the preset width is the width corresponding to the number of black lines inserted as 4H. When the nth display brightness value is adjusted to the n+ith display brightness value, 2 pulses are selected from the actual number of pulses, and the width of each of the 2 selected pulses is increased by the width corresponding to 4H, so as to change the duty cycle of the light-emitting control signal and adjust the display panel from the nth display brightness value to the n+ith display brightness value. Among them, the selected i pulses can be any i pulses in the drive signal including the actual number of pulses.

[0068] Optionally, when i is greater than or equal to 2, any two pulses among the i pulses selected to increase the preset width are not adjacent.

[0069] For example, if the pulses selected to increase the preset width are adjacent when adjusting the first display brightness value to the fifth display brightness value, such as selecting each of the second pulse, the third pulse, the fourth pulse and the fifth pulse to increase the width corresponding to 4H, the four pulses with the preset width increased are relatively concentrated, and the display brightness value curve is not smooth enough, which may easily lead to abnormal visual effects when adjusting from the first display brightness value to the fifth display brightness value. Therefore, when adjusting the display panel from the nth display brightness value to the n+ith display brightness value, any two pulses selected to increase the preset width are not adjacent to each other, so as to ensure that the distribution of the i pulses with the preset width increased is relatively uniform, so that the display brightness value adjustment process is smoother and abnormal visual effects are avoided.

[0070] Further, according to the preset corresponding relationship, i pulses corresponding to each display brightness value except the nth display brightness value from the nth display brightness value to the n+ith display brightness value are selected from all the pulses of the driving signal; the preset corresponding relationship is the corresponding relationship between each display brightness value except the first display brightness value among the m display brightness values ​​and the pulse with the preset width increased;

[0071] The width of each of i pulses selected from all pulses of the driving signal is increased by a preset width.

[0072] Except for the first display brightness value, each display brightness value corresponds to a pulse that needs to be increased by a preset width. The corresponding relationship between each display brightness value except the first display brightness value and the corresponding pulse that increases the preset width is established in advance. The preset corresponding relationship can be understood as the corresponding relationship between the larger display brightness value and the pulse that increases the preset width when the smaller of the two adjacent display brightness values ​​is adjusted to the larger one. If the second display brightness value is set in advance to increase the preset width of the pulse corresponding to the first pulse, then when adjusting from the first display brightness value to the second display brightness value, the preset width is increased in the first pulse to achieve a change in the duty cycle. The third display brightness value corresponds to the sixth pulse to increase the preset width. When adjusting from the second display brightness value to the third display brightness value, the preset width is increased in the sixth pulse to achieve a change in the duty cycle. When the fourth display brightness value corresponds to the twelfth pulse to increase the preset width, when adjusting from the third display brightness value to the fourth display brightness value, the preset width is increased at the twelfth pulse to achieve a change in the duty cycle.

[0073] Optionally, the driving signal includes h pulse groups, and each pulse group includes the same number of pulses, and the product of the number of pulses included in each pulse group and the number of pulse groups is equal to the actual number of pulses; h is a positive integer; the display panel includes multiple cycle groups, wherein, among the m display brightness values ​​from the first to the mth display brightness value, every h display brightness values ​​except the first display brightness value is a cycle group; that is, all pulses in the driving signal are evenly divided into h pulse groups, and among the m display brightness values, every h display brightness values ​​except the first display brightness value is a cycle group. The first display brightness value is the smallest display brightness value and does not correspond to a pulse that needs to increase the preset width. Starting from the second display brightness value, each display brightness value corresponds to a pulse that needs to increase the preset width. Exemplarily, when changing from the first display brightness value to the second display brightness value, the preset width needs to be increased in the second pulse, and the pulse that needs to increase the preset width corresponding to the second display brightness value is the second pulse.

[0074] The process of establishing the preset correspondence relationship includes:

[0075] For each cycle group:

[0076] A pulse is selected from each pulse group to increase the preset width, so as to increase the h*k+1th display brightness value to the h*k+h+1th display brightness value in sequence; k is an integer greater than or equal to 0;

[0077] In different cycle groups, for the same pulse group, different pulses with preset widths are added.

[0078] Optionally, h=4. The existing driver chip can support most pulse outputs that are multiples of 4. Therefore, h=4 is set to evenly divide all pulses of the drive signal into 4 pulse groups. Through the interception scheme, it is possible to generate a luminous control signal with almost any pulse number through the drive signal.

[0079] Table 1 shows the correspondence between each display brightness value except the first display brightness value among the m display brightness values ​​and the pulse with the preset width added. As shown in Table 1, with the target pulse number being 36 and the actual pulse number being 48, the actual pulse number is divided into 4 pulse groups, namely the first pulse group Cycle1, the second pulse group Cycle2, the third pulse group Cycle3 and the fourth pulse group Cycle4, and the display brightness value includes the first display brightness value (not shown in the table), the second display brightness value D1 to the seventeenth display brightness value D16. In an optional embodiment, in the first cycle group, the first pulse of the first pulse group Cycle1 is selected to increase the preset width to change the duty cycle of the driving signal, so as to adjust the display brightness value from the first display brightness value to the second display brightness value D1; the first pulse of the second pulse group Cycle2 is selected to increase the preset width to change the duty cycle of the driving signal, so as to adjust the display brightness value from the second display brightness value D1 to the third display brightness value D2; the first pulse of the third pulse group Cycle3 is selected to increase the preset width to change the duty cycle of the driving signal, so as to adjust the display brightness value from the third display brightness value D2 to the fourth display brightness value D3; the first pulse of the fourth pulse group Cycle4 is selected to increase the preset width to change the duty cycle of the driving signal, so as to adjust the display brightness value from the fourth display brightness value D3 to the fifth display brightness value D4. For the second cycle group, a pulse between the first pulse of the first pulse group Cycle1 and the first pulse of the second pulse group Cycle2, such as the seventh pulse of the first pulse group Cycle1, is selected to increase the preset width to change the duty cycle of the driving signal, so as to adjust the display brightness value from the fifth display brightness value D4 to the sixth display brightness value D5; a pulse between the first pulse of the second pulse group Cycle2 and the first pulse of the third pulse group Cycle2, such as the eighth pulse of the second pulse group Cycle1, is selected to increase the preset width to change the duty cycle of the driving signal, so as to adjust the display brightness value from the sixth display brightness value D5 to The seventh display brightness value D6; select a pulse between the first pulse of the third pulse group Cycle3 and the first pulse of the fourth pulse group Cycle4, such as the eighth pulse of the third pulse group Cycle1, to increase the preset width to change the duty cycle of the driving signal, so as to adjust the display brightness value from the seventh display brightness value D6 to the eighth display brightness value D7; select a pulse between the first pulse and the last pulse of the fourth pulse group Cycle4, such as the eighth pulse of the fourth pulse group Cycle4, to increase the preset width to change the duty cycle of the driving signal, so as to adjust the display brightness value from the eighth display brightness value D7 to the ninth display brightness value D8.The rest follow the similar rules mentioned above, and evenly distribute the pulses with increased preset widths, as shown in Table 1 for details, to ensure that the pulses with increased preset widths are distributed relatively evenly.

[0080] Table 1 Corresponding relationship between each display brightness value except the first display brightness value among m display brightness values ​​and the pulse with increased preset width

[0081]

[0082] In another optional implementation, please refer to Table 2, which shows another correspondence between each display brightness value except the first display brightness value among the m display brightness values ​​and the pulse with increased preset width. For the jth cycle group:

[0083] The j-th pulse in each pulse group is selected to increase the preset width, so as to sequentially increase the h*k+1-th display brightness value to the h*k+h+1-th display brightness value.

[0084] In the first cycle group, the first pulse of the first pulse group Cycle1 is selected to increase the preset width to change the duty cycle of the driving signal, so as to adjust the display brightness value from the first display brightness value to the second display brightness value D1; the first pulse of the second pulse group Cycle2 is selected to increase the preset width to change the duty cycle of the driving signal, so as to adjust the display brightness value from the second display brightness value D1 to the third display brightness value D2; the first pulse of the third pulse group Cycle3 is selected to increase the preset width to change the duty cycle of the driving signal, so as to adjust the display brightness value from the third display brightness value D2 to the fourth display brightness value D3; the first pulse of the fourth pulse group Cycle4 is selected to increase the preset width to change the duty cycle of the driving signal, so as to adjust the display brightness value from the fourth display brightness value D3 to the fifth display brightness value D4. For the second cycle group, the second pulse of the first pulse group Cycle1 is selected to increase the preset width to change the duty cycle of the driving signal, so as to adjust the display brightness value from the fifth display brightness value D4 to the sixth display brightness value D5; the second pulse of the second pulse group Cycle2 is selected to increase the preset width to change the duty cycle of the driving signal, so as to adjust the display brightness value from the sixth display brightness value D5 to the seventh display brightness value D6; the third pulse of the third pulse group Cycle3 is selected to increase the preset width to change the duty cycle of the driving signal, so as to adjust the display brightness value from the seventh display brightness value D6 to the eighth display brightness value D7; the second pulse of the fourth pulse group Cycle4 is selected to increase the preset width to change the duty cycle of the driving signal, so as to adjust the display brightness value from the eighth display brightness value D7 to the ninth display brightness value D8, and so on.

[0085] Table 2 Another corresponding relationship between each display brightness value except the first display brightness value among the m display brightness values ​​and the pulse with increased preset width

[0086]

[0087] Optionally, when the pulse with increased preset width is any pulse from the gth pulse to the last pulse in the driving signal, the display panel is driven to display in a DC dimming manner; wherein g is equal to the difference between the actual number of pulses and the target number of pulses.

[0088] Exemplarily, when adjusting the nth display brightness value to the n+ith display brightness value, if any of the intermediate display brightness values, such as the pulse with the increased preset width corresponding to the Lth display brightness value, is any pulse from the gth pulse to the last pulse, then at the Lth display brightness value, because the pulse with the increased preset width is a non-valid pulse, the Lth display brightness value will be identified as DC dimming with unchanged duty cycle, that is, the duty cycle of the Lth display brightness value is the same as the duty cycle corresponding to the L-1th display brightness value, and the display brightness value is adjusted by adjusting the size of the data voltage. Wherein, L is an integer greater than or equal to n and less than or equal to n+i. Taking Table 2 as an example, the fifth display brightness value D4, the ninth display brightness value D8, the thirteenth display brightness value D12 and the seventeenth display brightness value D16 will all be identified as DC dimming with unchanged duty cycle, and the display brightness is changed by changing the size of the data voltage at these display brightness values ​​in a DC dimming manner. Because all pulses are divided into multiple cycle groups, there is a situation in each cycle group where the pulse with the preset width is any pulse from the gth pulse to the last pulse, that is, there is a situation in each cycle group where the duty cycle remains unchanged and the corresponding display brightness value is identified as DC dimming. The display brightness values ​​corresponding to the DC dimming method are evenly distributed and account for a small proportion, and the overall PWM dimming accuracy is still high and there is no time-limited abnormality.

[0089] This embodiment conducts simulation experiments on the scheme of pulse replication in the prior art and the scheme of pulse interception in the present invention, and obtains Figure 4 and Figure 5 Two simulation diagrams. Figure 4 This is a simulation diagram of the smoothness of the display brightness value obtained by using the pulse replication solution. Figure 5 This is a simulation diagram of the smoothness of the display brightness value obtained by using the pulse interception solution. Figure 4 and Figure 5 The horizontal axis is the size of the display brightness value, and the vertical axis is the display brightness value smoothness, where the display brightness value smoothness DL / L=(Lv n+1 -Lvn ) / Lv n , Lv n+1 is the maximum brightness corresponding to the n+1th display brightness value, Lv n is the maximum brightness corresponding to the nth display brightness value. Display brightness value smoothness DL / L is one of the key indicators for evaluating the smoothness of the display brightness value curve. The main influencing factor of this indicator is dimming accuracy. Figure 4 and Figure 5 It can be seen that when the pulse interception scheme described in the present application is used to drive the display panel, compared with the pulse replication scheme, the display brightness value smoothness value is smaller, that is, the display brightness value curve is smoother and the visual effect is better.

[0090] The embodiment of the present invention further provides a driving device for a display panel. Figure 6 A schematic diagram of a driving device for a display panel according to an embodiment of the present invention is provided. Figure 6 , the driving device of the display panel comprises:

[0091] The pulse shift row number determination module 10 is used to determine the number of rows of pulse shift of the driving signal output by the driving chip corresponding to the display panel according to the target number of pulses of the light emitting control signal of the display panel in one frame and the number of scanning rows of the display panel;

[0092] The actual pulse number selection module 11 is used to select a standard pulse number from all standard pulse numbers that can be output by the driving chip as the actual pulse number used by the driving signal;

[0093] The output module 12 is used to output a driving signal to a light emitting control circuit that generates a light emitting control signal according to the number of rows of pulse shift and the actual number of pulses used by the driving signal.

[0094] The beneficial effects of the driving device of the display panel are the same as the beneficial effects of the driving method of the display panel, which will not be repeated here.

[0095] Optionally, the pulse shift row number determination module 11 includes a first subunit, configured to use the ratio of the number of scan rows of the display panel to the target number of pulses as the number of rows for pulse shifting.

[0096] The output module 12 includes:

[0097] A second subunit is used to configure the product of the number of rows of pulse shift and the actual number of pulses used as the preset number of scanning rows into the driver chip;

[0098] The driving subunit is used to output a driving signal to a light emitting control circuit that generates a light emitting control signal according to a preset number of scanning lines and the actual number of sampled pulses.

[0099] The driving device of the display panel also includes:

[0100] The adjustment module is used to drive the display panel to display by adopting a pulse width modulation mode. When the display panel is adjusted from the nth display brightness value to the n+ith display brightness value, the width of each pulse in the i pulses in the driving signal is increased by a preset width; m, n and i are all positive integers, and n and i are both less than m.

[0101] Optionally, the adjustment module includes:

[0102] A pulse selection unit is used to select i pulses corresponding to each display brightness value from the nth display brightness value to the n+ith display brightness value except the nth display brightness value from all pulses of the driving signal according to a preset corresponding relationship; the preset corresponding relationship is the corresponding relationship between each display brightness value except the first display brightness value among the m display brightness values ​​and the pulse with an increased preset width.

[0103] The preset width increasing unit is used to increase the width of each pulse of the selected i pulses by a preset width.

[0104] Optionally, the driving signal includes h pulse groups, and each pulse group includes the same number of pulses, and the product of the number of pulses included in each pulse group and the number of pulse groups is equal to the actual number of pulses; h is a positive integer; the display panel includes a plurality of cycle groups, wherein among the m display brightness values, each h display brightness values ​​is a cycle group; and the driving device of the display panel further includes:

[0105] Preset width increase module for

[0106] For each cycle group:

[0107] A pulse is selected from each pulse group to increase the preset width, so as to increase the h*k+1th display brightness value to h*k+h+1th display brightness value in sequence; k is an integer; in different cycle groups, for the same pulse group, the pulses with increased preset width are different.

[0108] Optionally, the driving device of the display panel further includes:

[0109] A DC driving module is used to drive the display panel to display in a DC dimming manner when the pulse with the preset width increased is any pulse from the gth pulse to the last pulse in the driving signal; wherein g is equal to the difference between the actual number of pulses and the target number of pulses.

[0110] An embodiment of the present invention further provides a display device, Figure 7 A schematic diagram of a display device according to an embodiment of the present invention is provided. Figure 7The display device includes a display panel, a driving chip and a driving device for the display panel. The display device 1 can be Figure 7 The mobile phone shown may also be a computer, a television, a smart wearable display device, etc., which is not particularly limited in the embodiments of the present invention. The beneficial effects of the display device are the same as those of the driving device of the display panel, which will not be described in detail here.

[0111] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0112] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for driving a display panel, characterized in that: include: Determine the number of rows of pulse shift of the driving signal output by the driving chip corresponding to the display panel according to the target number of pulses of the light emitting control signal of the display panel in one frame and the number of scanning rows of the display panel; Selecting a standard pulse number from all standard pulse numbers that can be output by the driving chip as the actual pulse number used by the driving signal; The selected standard pulse number is greater than the target pulse number; The driving signal is output to a light emitting control circuit that generates the light emitting control signal according to the number of rows of the pulse shift and the actual number of pulses used by the driving signal.

2. The method for driving a display panel according to claim 1, wherein: Determining the number of rows of pulse shift of the driving signal output by the driving chip corresponding to the display panel according to the target number of pulses of the light emitting control signal of the display panel in one frame and the number of scanning rows of the display panel comprises: The ratio of the number of scan lines of the display panel to the target number of pulses is used as the number of lines for pulse shifting; Outputting the driving signal to the light emitting control circuit that generates the light emitting control signal according to the number of rows of the pulse shift and the actual number of pulses used by the driving signal comprises: The product of the number of rows of the pulse shift and the actual number of pulses used is configured in the driving chip as a preset number of scanning rows; The driving signal is output to a light emitting control circuit that generates the light emitting control signal according to the preset number of scanning lines and the actual number of pulses used.

3. The method for driving a display panel according to claim 1, wherein: The selected standard pulse quantity is the quantity that is closest to and greater than the target pulse quantity among all standard pulse quantities that can be output by the driving chip corresponding to the display panel.

4. The method for driving a display panel according to claim 1, wherein: The display panel includes m display brightness values ​​that increase in sequence, and the driving method of the display panel further includes: The display panel is driven to display using a pulse width modulation mode. When the display panel is adjusted from the nth display brightness value to the n+ith display brightness value, the width of each pulse in the i pulses in the driving signal is increased by a preset width; m, n and i are all positive integers, and n and i are both less than m.

5. The method for driving a display panel according to claim 4, characterized in that: When i is greater than or equal to 2, any two pulses among the i pulses selected to increase the preset width are not adjacent.

6. The method for driving a display panel according to claim 4, characterized in that: The step of driving the display panel to display by adopting a pulse width modulation mode, and increasing the width of each pulse of i pulses in the driving signal by a preset width when adjusting the display panel from the nth display brightness value to the n+ith display brightness value, comprises: According to a preset corresponding relationship, i pulses corresponding to each display brightness value except the nth display brightness value from the nth display brightness value to the n+ith display brightness value are selected from all pulses of the driving signal; the preset corresponding relationship is a corresponding relationship between each display brightness value except the first display brightness value among the m display brightness values ​​and a pulse with an increased preset width; Increasing the width of each of the selected i pulses by a preset width; Preferably, the driving signal includes h pulse groups, and each pulse group includes the same number of pulses, and the product of the number of pulses included in each pulse group and the number of pulse groups is equal to the actual number of pulses; h is a positive integer; the display panel includes a plurality of cycle groups, wherein, among the m display brightness values, each h display brightness value except the first display brightness value is a cycle group; The process of establishing the preset corresponding relationship includes: For each of the cycle groups: Selecting a pulse from each of the pulse groups to increase the preset width, so as to sequentially increase the h*k+1th display brightness value to the h*k+h+1th display brightness value; k is an integer greater than or equal to 0; In different cycle groups, for the same pulse group, the pulses with the preset width added are different.

7. The method for driving a display panel according to claim 6, wherein: For the jth cycle group: Selecting the jth pulse in each of the pulse groups to increase the preset width, so as to sequentially increase the h*k+1th display brightness value to the h*k+h+1th display brightness value; Preferably, h=4.

8. The method for driving a display panel according to claim 4, wherein: The driving method of the display panel also includes: When the pulse with the preset width is increased to any pulse from the gth pulse to the last pulse in the driving signal, the display panel is driven to display in a DC dimming manner; wherein g is equal to the difference between the actual number of pulses and the target number of pulses.

9. A driving device for a display panel, characterized in that: include: A pulse shift row number determination module, used to determine the number of rows of pulse shift of the driving signal output by the driving chip corresponding to the display panel according to the target number of pulses of the light emitting control signal of the display panel in one frame and the number of scanning rows of the display panel; An actual pulse number selection module, used to select a standard pulse number from all standard pulse numbers that can be output by the driving chip as the actual pulse number used by the driving signal; The output module is used to output the driving signal to the light emitting control circuit that generates the light emitting control signal according to the number of rows of the pulse shift and the actual number of pulses used by the driving signal.

10. A display device, characterized in that: The invention comprises a display panel, a driving chip and the driving device of the display panel as claimed in claim 9.

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