Light-emitting control method of display screen and display screen

Abstract

The invention provides a light-emitting control method of a display screen and the display screen, and belongs to the technical field of backlight control, in the light-emitting control method, a plurality of backlight driving signals are generated according to the number of backlight units, and at least two backlight driving signals have different phases; and then, in the display period of one frame of image, the backlight units are driven to emit light according to the backlight driving signals, so that the light emitting time sequences of the at least two backlight units are different. Thus, in the charging process of the pixel circuits in the same row, the pixel circuits in the same row can be in the state of charging in the opening time period of the backlight unit and the state of charging in the closing time period of the backlight unit. According to the technical scheme, even if a bright band is generated in the process of charging the pixel circuit in the turn-on time period of the backlight unit, the bright band does not penetrate through the whole display screen and is uniformly dispersed in the whole display screen, so that the water ripple phenomenon of the display screen can be reduced.

Description

Technical Field

[0001] The present application relates to the field of display technologies, and particularly relates to a method for controlling the light emission of a display screen and a display screen. Background Art

[0002] As a core carrier for information interaction and visual experience, display screens have been widely used in fields such as mobile phones, computers, and televisions. For example, in a liquid crystal display screen, its backlight unit including light-emitting devices (such as LED lamp beads) can provide light for the screen, and the light passes through optical structures such as a light guide plate, a diffusion film, and a brightness enhancement film to eliminate light spots or dark areas, and convert the original linear light source into a uniform surface light source for the entire display screen.

[0003] Currently, in some common control methods for backlight units, the backlight units are turned on and off simultaneously, and the light-emitting timings are synchronized. When the display screen presents a high gray-scale image, since the brightness of the picture itself is relatively high, it is not easy to appear bright bands or uneven brightness. However, when the display screen presents a low gray-scale image, since the picture brightness is relatively low, affected by various factors such as the conductive materials of the display screen, even a small change in voltage and current is likely to affect the display effect, and alternating bright and dark stripes will appear on the display screen, forming a waterfall pattern, which affects the display effect. Summary of the Invention

[0004] Aiming at the deficiencies in the prior art, the present application provides a method for controlling the light emission of a display screen and a display screen.

[0005] In a first aspect, a method for controlling the light emission of a display screen provided by the present application, the display screen includes a plurality of backlight units arranged in sequence along a set direction, the set direction is perpendicular to the display scanning direction of the display screen, and the method includes:

[0006] Generating a plurality of backlight driving signals according to the number of the backlight units; wherein, each of the backlight driving signals is used to control one of the backlight units to emit light, and at least two of the backlight driving signals have different phases;

[0007] During the display period of a frame of image, driving the backlight units to emit light respectively according to the backlight driving signals, so that the light-emitting timings of at least two of the backlight units are different.

[0008] Optionally, the generating a plurality of backlight driving signals according to the number of the backlight units includes:

[0009] Obtaining a period interval according to a preset period of the backlight driving signal and the number of the backlight units;

[0010] Generating a phase offset of each of the backlight driving signals according to the period interval;

[0011] Generate the backlight driving signals corresponding to each of the backlight units respectively according to the preset duty ratio, the preset period, and the phase offset amount of the backlight driving signals.

[0012] Optionally, the preset period is less than or equal to the display period of one frame of image.

[0013] Optionally, the preset duty ratio is greater than or equal to 1 / N; where N is the number of the backlight units.

[0014] Optionally, driving the backlight units to emit light respectively according to each of the backlight driving signals, such that the light emission timings of at least two of the backlight units are different, includes:

[0015] Input each of the backlight driving signals to each of the backlight units respectively according to the phase offset amount of each of the backlight driving signals, such that the light emission timings of at least two of the backlight units are different.

[0016] Optionally, inputting each of the backlight driving signals to each of the backlight units respectively according to the phase offset amount of each of the backlight driving signals, includes:

[0017] Input at least two of the backlight driving signals having a target phase difference to corresponding target backlight units respectively, where there is at least one other backlight unit between any two target backlight units, so that the light emission timings between adjacent backlight units are at least spaced apart by 2 / N of the preset period;

[0018] Where N is the number of the backlight units, and the target phase difference means that the difference between the phase offset amounts is the period interval amount.

[0019] Optionally, inputting each of the backlight driving signals to each of the backlight units respectively according to the phase offset amount of each of the backlight driving signals, such that the light emission timings of at least two of the backlight units are different includes:

[0020] Input each of the backlight driving signals to each of the backlight units in the arrangement order of the backlight units respectively according to the magnitude order of the phase offset amounts of each of the backlight driving signals, such that the light emission timings of adjacent backlight units are sequentially spaced apart by 1 / N of the preset period;

[0021] Where N is the number of the backlight units.

[0022] Optionally, the backlight units are divided into several backlight groups; the backlight driving signals include a plurality of first signal groups, the phases of the backlight driving signals within the same first signal group are the same, and the phases of the backlight driving signals in different first signal groups are different;

[0023] Respectively driving the backlight unit to emit light according to each of the backlight driving signals, so that the light emission timings of at least two of the backlight units are different, includes:

[0024] Inputting each of the first signal groups into the corresponding backlight group respectively, so that the light emission timings of the backlight units in the same backlight group are the same, and the light emission timings of the backlight units in different backlight groups are different.

[0025] Optionally, the backlight units are divided into several backlight groups; the backlight driving signals include multiple second signal groups, and the phases of the backlight driving signals within the same second signal group are different;

[0026] Respectively driving the backlight unit to emit light according to each of the backlight driving signals, so that the light emission timings of at least two of the backlight units are different, includes:

[0027] Inputting each of the second signal groups into the corresponding backlight group respectively, so that the light emission timings of the backlight units in the same backlight group are different, and each of the backlight units in each backlight group has the same light emission timing as one of the backlight units in other backlight groups respectively.

[0028] In a second aspect, in an embodiment, the present application provides a display screen, including:

[0029] A plurality of backlight units arranged in sequence along a set direction, and the set direction is perpendicular to the display scanning direction of the display screen;

[0030] A light emission control unit, connected to the backlight unit, for executing the foregoing light emission control method.

[0031] In summary, in the present application, by generating backlight driving signals with at least two different phases according to the number of backlight units. Then, driving the backlight unit to emit light according to the backlight driving signal within the display period of one frame of image, so that the light emission timings of at least two backlight units are different within the display period of one frame of image, thereby during the charging process of the pixel circuits in the same row, the pixel circuits in the same row can have both the state of being charged during the on period of the backlight unit and the state of being charged during the off period of the backlight unit. At this time, even if a bright band is generated during the charging process of the pixel circuit during the on period of the backlight unit, the bright band will not penetrate the entire display screen. In this way, visually, the bright band is relatively evenly dispersed throughout the display screen, so that without the need for improvement in materials or manufacturing processes, the moire phenomenon of the display screen can be reduced and the display effect can be improved. Description of the Drawings

[0032] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0033] Figure 1 It is a schematic diagram of the principle of water ripple generation in an embodiment of the present application;

[0034] Figure 2 It is a flowchart of the light emission control method for a display screen in an embodiment of the present application;

[0035] Figure 3 It is a schematic diagram of the arrangement of the backlight unit in an embodiment of the present application;

[0036] Figure 4 It is a timing diagram and a schematic diagram of the display effect of the backlight driving unit in the first embodiment of the present application;

[0037] Figure 5 It is a timing diagram and a schematic diagram of the display effect of the backlight driving unit in the second embodiment of the present application;

[0038] Figure 6 It is a timing diagram and a schematic diagram of the display effect of the backlight driving unit in the third embodiment of the present application;

[0039] Figure 7 It is a timing diagram and a schematic diagram of the display effect of the backlight driving unit in the fourth embodiment of the present application. Detailed implementation manners

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0041] In the description of this application, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of this application, "a plurality of" means two or more, unless otherwise specifically defined. In this application, the word "exemplary" is used to mean "serving as an example, illustration, or explanation". Any embodiment described as "exemplary" in this application is not necessarily to be construed as more preferred or advantageous than other embodiments. In order to enable any person skilled in the art to implement and use this application, the following description is given. In the following description, details are set forth for purposes of explanation. It should be understood that those of ordinary skill in the art can recognize that this application can be implemented without these specific details. In other instances, well-known structures and processes are not elaborated in detail so as not to obscure the description of this application with unnecessary details. Therefore, this application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed in this application.

[0042] First, in combination with the above background art, the background for the proposal of this application is further elaborated. During the manufacturing process of a display screen, for example, thin-film transistors and pixel electrodes are formed on a glass substrate through a four-mask process (Four Mask Process, 4Mask). In the four-mask process, when the tail structure of the second metal layer (Metal2, M2) bulges outward, light irradiation will enhance the conductivity of amorphous silicon (Amorphous Silicon, AS) material. When the backlight is turned on (Backlight Unit On, BLUOn), the conductivity of the amorphous silicon below the data line (Data Line) increases, resulting in an increase in the coupling capacitance between the pixel unit and the data line; when the backlight is turned off (Backlight Unit Off, BLUOff), the conductivity of the amorphous silicon weakens, and the coupling capacitance decreases accordingly.

[0043] Refer to Figure 1 , where Data represents the data signal, Pixel represents the voltage change curve during the charging process of the pixel circuit according to the data signal, Gate represents the gate control signal used to control the on / off of the pixel circuit, and in its high-level state, the pixel circuit starts to charge. BLUoff represents that the backlight unit is turned off, and BLUon represents that the backlight unit is turned on. Thus, Figure 1 (a) in Figure 1In (b), it shows the voltage changes of the pixel circuit when it is in the charging state during the period when the backlight is turned off. Since the coupling capacitance value changes continuously in the on and off states of the backlight unit, the influence on the output voltage of the backlight unit is different in the first case where the pixel circuit is charged during the on period of the backlight unit and the second case where the pixel circuit is charged during the off period of the backlight unit. As a result, the output voltage BVon of the backlight unit in the first case is greater than the output voltage BVoff of the backlight unit in the second case, which ultimately leads to the backlight brightness in the first case being brighter than that in the second case. Consequently, bright bands will appear visually on the display screen. During the display process of each frame of image, the backlight unit needs to be continuously turned on and off. As the data signals are charged and written row by row, the data signals of the pixel circuits in some rows will be charged and written during the on period of the backlight unit, while the data signals of the pixel circuits in some rows will be written during the off period of the backlight unit. This causes periodic bright and dark alternations of moiré patterns at different positions in the same frame of image. Especially in the display of low gray-scale images, the moiré phenomenon will be more serious.

[0044] Based on this, an embodiment of the light emission control method for the display screen of the present application is proposed.

[0045] In the first aspect, as Figure 2 shown, in an embodiment, the present application provides a light emission control method for a display screen. The display screen includes a plurality of backlight units arranged in sequence along a set direction, and the set direction is perpendicular to the display scanning direction of the display screen. The light emission control method of the display screen includes step S110 and step S120, which will be introduced in detail below.

[0046] Step S110: Generate a plurality of backlight driving signals according to the number of backlight units.

[0047] Among them, each backlight driving signal is used to control one backlight unit to emit light, and at least two backlight driving signals have different phases.

[0048] Referring to Figure 3 , only as an example, the number of backlight units can be 8. If the display scanning direction is the vertical direction, then the backlight units are arranged in sequence along the horizontal direction. The backlight driving signal can be a pulse width modulation signal, and the number of backlight driving signals is the same as the number of backlight units, including the first backlight driving signal PWM1, the second backlight driving signal PWM2, the third backlight driving signal PWM3, the fourth backlight driving signal PWM4, the fifth backlight driving signal PWM5, the sixth backlight driving signal PWM6, the seventh backlight driving signal PWM7, and the eighth backlight driving signal PWM8. The display screen further includes a data driver for outputting data signals to each row of pixel circuits so that the pixel circuits can be charged according to the data signals to achieve the display function.

[0049] Continue to refer to Figure 2 , the driving sequence of each backlight driving signal and the backlight unit can be set according to the actual situation. For example, the fourth backlight driving signal PWM4 is used to drive the first backlight unit, the third backlight driving signal PWM3 is used to drive the second backlight unit, the second backlight driving signal PWM2 is used to drive the third backlight unit, the first backlight driving signal PWM1 is used to drive the fourth backlight unit, the eighth backlight driving signal PWM8 is used to drive the fifth backlight unit, the seventh backlight driving signal PWM7 is used to drive the sixth backlight unit, the sixth backlight driving signal PWM6 is used to drive the seventh backlight unit, and the fifth backlight driving signal PWM5 is used to drive the eighth backlight unit. Specifically, it can be determined according to actual needs, and this embodiment does not limit this.

[0050] Step S120: During the display period of one frame of image, drive the backlight unit to emit light according to each backlight driving signal, so that the light-emitting timings of at least two backlight units are different.

[0051] As an example, the backlight driving signal includes an effective level state and an invalid level state, and the phase of the backlight driving signal is used to represent the duration of the effective level signal of the backlight driving signal. For example, when the backlight unit is controlled to turn on by a low level, the effective level state of the backlight driving signal is a low level state, and the invalid level state is a high level state. In this way, for backlight driving signals with different phases, the time instants when they enter the effective level state and the invalid level state are different, so that the light-emitting timings of the backlight units can be different through backlight driving signals with different phases.

[0052] In the above embodiment, backlight driving signals with at least two different phases are generated according to the number of backlight units. Then, during the display period of one frame of image, the backlight unit is driven to emit light according to the backlight driving signal, so that the light-emitting timings of at least two backlight units are different during the display period of one frame of image. Thus, during the charging process of the same row of pixel circuits, the same row of pixel circuits can have a state of being charged during the backlight unit on period and a state of being charged during the backlight unit off period. At this time, even if a bright band is generated during the charging process of the pixel circuit during the backlight unit on period, the bright band will not penetrate the entire display screen. In this way, visually, the bright band is relatively evenly distributed throughout the display screen, so that without improving materials or manufacturing processes, the moiré phenomenon of the display screen can be reduced and the display effect can be improved.

[0053] As an implementation manner of step S110, step S110 may include steps S111 - S113, which will be introduced in detail below.

[0054] Step S111: Obtain the period interval according to the preset period of the backlight driving signal and the number of backlight units.

[0055] As an example, the preset period is less than or equal to the display period of one frame of image. For example, the display period of one frame of image can be several times or dozens of times the preset period, etc. For example, when the refresh rate of the display screen is 60Hz, the frequency of the backlight driving signal can be between 1.62KHz and 1.86KHz. Then the display period of one frame of image is 16.67 milliseconds, and the preset period of the backlight driving signal can be between 0.5 - 1 millisecond.

[0056] As an example, if the preset period of the backlight driving signal is T, for example, T = 0.8 millisecond. Then calculate the period interval according to the preset period T and the number of backlight units N (N = 8). The preset period T can be evenly distributed to the backlight driving signals corresponding to N backlight units. Then the period interval can be expressed as (1 / N)×T. When the preset period is 0.8 millisecond and the number of backlight units is eight, the period interval is 0.1 millisecond. Among them, the time values in the above examples are only for explaining the control logic and principle of the light emission control method of the present application, and do not constitute a limitation on the actual application of the display screen. The actual parameter settings of the product can be determined according to the actual situation and requirements.

[0057] Step S112: Generate the phase offset of each backlight driving signal according to the period interval.

[0058] As an example, the period offset of each backlight driving signal can be generated according to the period interval, and then the phase offset of each backlight driving signal can be obtained according to the period offset. The period offsets of each backlight driving signal are respectively offset by zero period intervals to offset by seven period intervals. Then the phase offsets of each backlight driving signal are respectively 0, M, 2M, 3M, 4M, 5M, 6M, and 7M, where M represents the period interval. In this way, the phase offset of each backlight driving signal can be obtained, and this phase offset can control the time offset of the effective level signal of the backlight driving signal.

[0059] Step S113: Generate the backlight driving signals corresponding to each backlight unit according to the preset duty cycle, preset period, and phase offset of the backlight driving signal.

[0060] As an example, the preset duty cycle is the ratio of the effective level of the backlight driving signal to the preset period. For example, if the duty cycle is 0.5, then within a preset period T = 0.8 millisecond, the duration of the effective level and the duration of the ineffective level are both 0.4 millisecond.

[0061] As an example, the preset duty ratio is greater than or equal to 1 / N. Here, N is the number of backlight units. If the preset duty ratio is less than 1 / N, and each adjacent backlight driving signal is sequentially offset by a period interval amount, the duration of the effective level cannot cover the duration of the offset period interval amount, resulting in a timing when all backlight units are in the off state. By setting the preset duty ratio to be greater than or equal to 1 / N, it can be ensured that at least one backlight unit is in the on state at each moment, providing the backlight source required for display.

[0062] As the first implementation manner of step S120, each backlight driving signal can be input to each backlight unit according to the phase offset amount of each backlight driving signal, so that the light-emitting timings of at least two backlight units are different.

[0063] Refer to Figure 4 , in one embodiment, at least two backlight driving signals with a target phase difference can be respectively input to the corresponding target backlight units.

[0064] Among them, as an example, the target phase difference means that the difference in phase offset amounts is a period interval amount. Combining Figure 4 in (a), every two adjacent backlight driving signals have a target phase difference. For example, there is a target phase difference between the first backlight driving signal PWM1 and the fifth backlight driving signal PWM5, a target phase difference between the fifth backlight driving signal PWM5 and the third backlight driving signal PWM3, a target phase difference between the third backlight driving signal PWM3 and the seventh backlight driving signal PWM7, and so on. When at least two backlight driving signals with a target phase difference respectively control two backlight units to turn on, the turn-on interval between the two backlight units is short, the turn-on interval is a period interval amount, and the duration of simultaneous turn-on is long.

[0065] Among them, in one embodiment, there is at least one other backlight unit between any two target backlight units, so that the light-emitting timings between adjacent backlight units are at least 2 / N preset periods apart. N is the number of backlight units. Since at least two backlight driving signals with a target phase difference will control the corresponding backlight units to have a short turn-on interval, the at least two backlight driving signals with a target phase difference are respectively input to the target backlight units with at least one other backlight unit spaced therebetween, so that the target backlight units are two non-adjacent backlight units. In this way, the physical distance between different backlight units with a short turn-on interval on the display screen can be far, and the generated bright bands can be dispersed at different positions on the display screen to reduce the continuous area of the formed bright bands.

[0066] Combining Figure 4 , Figure 4Among them, (a) is the timing diagram of each backlight driving signal, Figure 4 and (b) among them is the schematic diagram of the distribution of the bright bands generated under the control of each backlight driving signal. As an example, taking the time period of the preset cycle marked in (a) among Figure 4 as an example, the first backlight driving signal PWM1 first controls the fourth backlight unit to turn on. At the same time, the display screen starts to charge the pixel circuit in the first row of pixels. At this time, all the backlight units except the fourth backlight unit are in the off state. Therefore, a bright band is formed only at the fourth backlight unit ( Figure 4 as shown by the gray rectangular grid in). Subsequently, the fifth backlight driving signal PWM5 controls the eighth backlight unit to turn on. At this time, the fourth backlight unit and the eighth backlight unit are turned on simultaneously. During this time period, the pixel circuit is charged row by row with the fourth backlight unit and the eighth backlight unit turned on, so as to form bright bands in the corresponding areas of the fourth backlight unit and the eighth backlight unit. Then, the third backlight driving signal PWM3 controls the second backlight unit to turn on. At this time, the second backlight unit, the fourth backlight unit, and the eighth backlight unit are turned on simultaneously, and bright bands are formed in the corresponding areas of the second backlight unit, the fourth backlight unit, and the eighth backlight unit. Then, the seventh backlight driving signal PWM7 controls the sixth backlight unit to turn on. At this time, the first backlight driving signal PWM1 has entered the invalid level state, and the fourth backlight unit is turned off. Then, the second backlight unit, the sixth backlight unit, and the eighth backlight unit are turned on simultaneously, so as to form bright bands in the corresponding areas of the second backlight unit, the sixth backlight unit, and the eighth backlight unit. From the above distribution of the areas where the bright bands are formed, it can be seen that the distance between each area where the bright bands appear in the display screen is relatively far, at least separated by one backlight unit, so that the bright bands are dispersed on the entire display screen, and the moiré phenomenon can be reduced.

[0067] Referring to Figure 5 , in another embodiment, according to the magnitude order of the phase offsets of each backlight driving signal, each backlight driving signal can be input to each backlight unit in the arrangement order of the backlight units respectively, so that the light-emitting timings of adjacent backlight units are sequentially separated by 1 / N of the preset cycle. As an example, taking Figure 5Taking the time period of a preset cycle in (a) as an example, in the order of the magnitude of the phase offset, the phase offset of the fifth backlight driving signal PWM5 is 0, and the phase offsets of the sixth backlight driving signal PWM6, the seventh backlight driving signal PWM8, the eighth backlight driving signal PWM8, the first backlight driving signal PWM1, the second backlight driving signal PWM2, the third backlight driving signal PWM3, and the fourth backlight driving signal PWM4 increase in sequence, so that the moments when the sixth backlight driving signal PWM6, the seventh backlight driving signal PWM7, the eighth backlight driving signal PWM8, the first backlight driving signal PWM1, the second backlight driving signal PWM2, the third backlight driving signal PWM3, and the fourth backlight driving signal PWM4 enter the effective level are incremented by a period interval compared to the moment when the fifth backlight driving signal PWM5 enters the effective level.

[0068] Combined with Figure 5 , Figure 5 (a) in is the timing diagram of each backlight driving signal. Figure 5 (b) in is the distribution schematic diagram of the bright band generated under the control of each backlight driving signal. The fifth backlight driving signal PWM5 first controls the eighth backlight unit to turn on, and at the same time, the display screen starts to charge the pixel circuit in the first row. At this time, all the other backlight units except the eighth backlight unit are in the off state, so a bright band will only be formed at the eighth backlight unit. Subsequently, the sixth backlight driving signal PWM6 controls the seventh backlight unit to turn on. At this time, the seventh backlight unit and the eighth backlight unit are turned on simultaneously. During this period, the pixel circuit charges row by row in the state where the seventh backlight unit and the eighth backlight unit are turned on, so as to form a bright band in the corresponding areas of the seventh backlight unit and the eighth backlight unit. Then, the seventh backlight driving signal PWM7 controls the sixth backlight unit to turn on. At this time, the sixth backlight unit, the seventh backlight unit, and the eighth backlight unit are turned on simultaneously, and a bright band is formed in the corresponding areas of the sixth backlight unit, the seventh backlight unit, and the eighth backlight unit. Then, the eighth backlight driving signal PWM8 controls the fifth backlight unit to turn on. At this time, the fifth backlight driving signal PWM5 has entered the invalid level state, and the eighth backlight unit is turned off, so the fifth backlight unit, the sixth backlight unit, and the seventh backlight unit are turned on simultaneously, thus forming a bright band in the corresponding areas of the fifth backlight unit, the sixth backlight unit, and the seventh backlight unit. In this way, by the sequential conduction and shutdown of each backlight unit, the bright band appears and disappears successively at each corresponding position of the display screen, and the dispersion of the bright band can also be realized to reduce the moiré phenomenon.

[0069] Referring to Figure 6, as the second implementation manner of step S120, the backlight unit is divided into several backlight groups, the backlight driving signal includes multiple first signal groups, the phases of the backlight driving signals within the same first signal group are the same, and the phases of the backlight driving signals in different first signal groups are different. In step S120, each first signal group can be respectively input to the corresponding backlight group, so that the light-emitting timings of the backlight units in the same backlight group are the same, and the light-emitting timings of the backlight units in different backlight groups are different.

[0070] As an example, the backlight unit is divided into several backlight groups, and the number of backlight groups can be two or more. Through the first signal group, the light-emitting timings of the backlight units in the same backlight group are the same, and the light-emitting timings of the backlight units in different backlight groups are different. In this way, when the pixel circuit is charging, a bright band will only be generated at the corresponding position of the backlight group in the on state, and the bright band will not penetrate the entire row of pixel circuits, which can also reduce the moiré phenomenon to a certain extent.

[0071] Combined with Figure 6 , Figure 6 Figure (a) in Figure 6 is the timing diagram of each backlight driving signal, Figure 6 Figure (b) in

[0072] is the schematic diagram of the distribution of the bright band generated under the control of each backlight driving signal. Figure 7, as the third implementation manner of step S120, the backlight unit is divided into several backlight groups. The backlight driving signal includes a plurality of second signal groups, and the phases of the backlight driving signals within the same second signal group are different. In this way, in step S120, each second signal group can be respectively input to the corresponding backlight group, so that the light-emitting timings of the backlight units in the same backlight group are different, and the light-emitting timings of the backlight units in each backlight group are respectively the same as those of one of the backlight units in other backlight groups.

[0073] As an example, the backlight unit is divided into several backlight groups. Through the second signal group, the light-emitting timings of the backlight units in the same backlight group are different, and the light-emitting timings of the backlight units in each backlight group are respectively the same as those of one of the backlight units in other backlight groups. In this way, when the pixel circuit is charged, the backlight units with a relatively close physical distance on the display screen will not be lit simultaneously, so that a large-area bright band will not appear. The backlight units in different backlight groups are physically far apart on the display screen, and the bright bands generated when they are turned on simultaneously will be dispersed, which can reduce the moiré phenomenon.

[0074] Combined with Figure 7 , Figure 7 (a) in is the timing diagram of each backlight driving signal, Figure 7 (b) in is the schematic diagram of the distribution of the bright bands generated under the control of each backlight driving signal. As an example, the timings when the first backlight driving signal PWM1, the second backlight driving signal PWM2, the third backlight driving signal PWM3, and the fourth backlight driving signal PWM4 respectively enter the effective level can increase by one cycle offset in sequence. Similarly, the timings when the fifth backlight driving signal PWM5, the sixth backlight driving signal PWM6, the seventh backlight driving signal PWM7, and the eighth backlight driving signal PWM8 respectively enter the effective level can increase by one cycle offset in sequence, and the first backlight driving signal PWM1 is the same as the fifth backlight driving signal PWM5, the second backlight driving signal PWM2 is the same as the sixth backlight driving signal PWM6, and so on.

[0075] First, the fourth backlight unit and the eighth backlight unit are simultaneously controlled to turn on by the first backlight driving signal PWM1 and the fifth backlight driving signal PWM5. As the pixel circuit is charged, bright bands will be generated at the corresponding positions of the fourth backlight unit and the eighth backlight unit. Then, the second backlight driving signal PWM2 and the sixth backlight driving signal PWM6 simultaneously control the third backlight unit and the seventh backlight unit to turn on. As the pixel circuit is charged, bright bands will be generated at the corresponding positions of the third backlight unit and the seventh backlight unit, and so on. In this way, since the backlight units turned on each time are distributed in different backlight groups and are physically far apart on the display screen, the generated bright bands will be dispersed. Although the physical distance on the display screen is relatively close within the same backlight group, each backlight unit will turn on at different time sequences, so that the area corresponding to the same backlight group will not generate bright bands at the same time. In this way, the moiré phenomenon can be effectively reduced.

[0076] In a second aspect, in one embodiment, the present application provides a display screen, including a light emission control unit and a plurality of backlight units.

[0077] Among them, the plurality of backlight units are arranged in sequence along a set direction, and the set direction is perpendicular to the display scanning direction of the display screen. The light emission control unit is connected to the backlight unit and is used to execute each step in the foregoing light emission control method.

[0078] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0079] Among the embodiments, implementation manners and related technical features of the present application, they can be combined and replaced with each other without conflict.

[0080] The above are only the preferred embodiments of the present application and do not impose any formal restrictions on the present application. However, as long as it does not depart from the content of the technical solution of the present application, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application still fall within the scope of the technical solution of the present application.

Claims

1. A method for controlling the light emission of a display screen, characterized in that, The display screen includes a plurality of backlight units arranged in sequence along a set direction, and the set direction is perpendicular to the display scanning direction of the display screen. The method includes: Generating a plurality of backlight driving signals according to the number of the backlight units; wherein, each of the backlight driving signals is used to control one of the backlight units to emit light, and at least two of the backlight driving signals have different phases; During the display period of a frame of image, driving the backlight units to emit light respectively according to the respective backlight driving signals, so that the light-emitting timings of at least two of the backlight units are different.

2. The method for controlling the light emission of the display screen according to claim 1, wherein The generating a plurality of backlight driving signals according to the number of the backlight units includes: Obtaining a period interval amount according to the preset period of the backlight driving signal and the number of the backlight units; Generating a phase offset amount of each of the backlight driving signals according to the period interval amount; Generating the backlight driving signals respectively corresponding to the respective backlight units according to the preset duty ratio, the preset period, and the phase offset amount of the backlight driving signal.

3. The method for controlling the light emission of the display screen according to claim 2, wherein The preset period is less than or equal to the display period of a frame of image.

4. The method for controlling the light emission of the display screen according to claim 2, wherein The preset duty ratio is greater than or equal to 1 / N; wherein, N is the number of the backlight units.

5. The method for controlling the light emission of the display screen according to any one of claims 2 to 4, characterized in that, The driving the backlight units to emit light respectively according to the respective backlight driving signals, so that the light-emitting timings of at least two of the backlight units are different includes: Inputting the respective backlight driving signals to the respective backlight units respectively according to the phase offset amount of each of the backlight driving signals, so that the light-emitting timings of at least two of the backlight units are different.

6. The method for controlling the light emission of the display screen according to claim 5, wherein, The inputting the respective backlight driving signals to the respective backlight units respectively according to the phase offset amount of each of the backlight driving signals includes: Inputting at least two of the backlight driving signals having a target phase difference to the corresponding target backlight units respectively, wherein there is at least one other backlight unit between any two target backlight units, so that the light-emitting timings between adjacent backlight units are at least separated by 2 / N of the preset period; Wherein, N is the number of the backlight units, and the target phase difference means that the difference between the phase offset amounts is the period interval amount.

7. The method for controlling the light emission of the display screen according to claim 5, wherein The inputting the respective backlight driving signals to the respective backlight units respectively according to the phase offset amount of each of the backlight driving signals, so that the light-emitting timings of at least two of the backlight units are different includes: Inputting the respective backlight driving signals to the respective backlight units in the arrangement order of the backlight units respectively according to the magnitude order of the phase offset amounts of the respective backlight driving signals, so that the light-emitting timings of adjacent backlight units are sequentially separated by 1 / N of the preset period; Wherein, N is the number of the backlight units.

8. The method for controlling the light emission of a display screen according to claim 1, characterized in that, The backlight units are divided into several backlight groups; the backlight driving signals include a plurality of first signal groups, and the phases of the respective backlight driving signals in the same first signal group are the same, and the phases of the backlight driving signals in different first signal groups are different; The driving the backlight units to emit light respectively according to the respective backlight driving signals, so that the light-emitting timings of at least two of the backlight units are different includes: Input each of the first signal groups into the corresponding backlight group respectively, so that the light emission timings of the backlight units in the same backlight group are the same, and the light emission timings of the backlight units in different backlight groups are different.

9. The method for controlling the light emission of the display screen according to claim 1, wherein The backlight units are divided into several backlight groups; the backlight driving signals include a plurality of second signal groups, and the phases of the backlight driving signals within the same second signal group are different; Driving the backlight units to emit light according to the respective backlight driving signals respectively, so that the light emission timings of at least two backlight units are different, includes: Input each of the second signal groups into the corresponding backlight group respectively, so that the light emission timings of the backlight units in the same backlight group are different, and the light emission timings of each backlight unit in each backlight group are the same as those of one of the backlight units in other backlight groups respectively.

10. A display screen, characterized in that, Includes: A plurality of backlight units are arranged in sequence along a set direction, and the set direction is perpendicular to the display scanning direction of the display screen; A light emission control unit, connected to the backlight units, for performing the steps of the light emission control method according to any one of claims 1-9.

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