Backlight source control method, backlight source, and display device

Abstract

A backlight source control method, a backlight source, and a display device. The control method comprises: looking up, from a data lookup table, a first duty cycle and a second duty cycle respectively corresponding to circadian blue light and low blue light corresponding to a time period within which the current time is, wherein a blue light peak value of the circadian blue light is a first peak value, a blue light peak value of the low blue light is a second peak value, the first peak value is greater than the second peak value, and the data lookup table is used for representing duty cycles corresponding to circadian blue light and low blue light corresponding to different time periods (701); and adjusting the proportion of the circadian blue light in a backlight source on the basis of the first duty cycle and the second duty cycle, so that a circadian stimulus value generated by the backlight source is within a standard circadian stimulus value range of a corresponding time period (702).

Description

Backlight source control method, backlight source and display device Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a backlight control method, a backlight source, and a display device. Background Art

[0002] Display products are widely used in daily life, and light (artificial light) is essential when using display products.

[0003] Some studies suggest that regulating the time the eyes are exposed to artificial light can positively stimulate the body's circadian rhythm, thereby improving health, increasing work efficiency and reducing the risk of illness.

[0004] In view of this, how to adjust the backlight of display products so that the display products can have a positive stimulating effect on the human body's circadian rhythm has become a technical problem that needs to be solved urgently.

[0005] Summary of the Invention

[0006] The embodiments of the present disclosure provide a backlight control method, a backlight, and a display device to solve the above-mentioned technical problems existing in the prior art.

[0007] In a first aspect, to solve the above technical problems, the present disclosure provides a backlight control method, including:

[0008] Searching the data lookup table for the first duty cycle and the second duty cycle of the rhythmic blue light and the low blue light corresponding to the time period of the current time; wherein the blue light peak of the rhythmic blue light is the first peak value, the blue light peak of the low blue light is the second peak value, the first peak value is greater than the second peak value, and the data lookup table is used to represent the duty cycles of the rhythmic blue light and the low blue light corresponding to different time periods;

[0009] According to the first duty cycle and the second duty cycle, the proportion of the rhythmic blue light in the backlight source is adjusted so that the circadian rhythm stimulation value generated by the backlight source is within the standard circadian rhythm stimulation value range of the corresponding time period.

[0010] In one possible implementation, searching a data lookup table for the first duty cycle and the second duty cycle corresponding to the rhythmic blue light and low blue light corresponding to the time period of the current time, respectively, includes:

[0011] Determining whether the current time belongs to nighttime according to the time period to which the current time belongs;

[0012] If yes, the brightness of the backlight source is reduced according to a preset ratio.

[0013] In one possible implementation, reducing the brightness of the backlight source according to a preset ratio includes:

[0014] According to the preset ratio, the duty cycle of the low blue light corresponding to the time period to which the current time belongs is obtained from the data lookup table, so as to obtain a second duty cycle corresponding to the low blue light.

[0015] In one possible implementation, after determining the first duty cycle corresponding to the rhythmic blue light and the second duty cycle corresponding to the low blue light, the method further includes:

[0016] Determining whether a third duty cycle of blue light used in an adjacent time period adjacent to the time period in which the current time falls is the same as a fourth duty cycle of blue light used in the time period in which the current time falls; wherein the blue light includes the rhythmic blue light and the low blue light;

[0017] If they are different, the duty cycle of the blue light is controlled to smoothly transition between the adjacent time periods and the time period where the current time is located.

[0018] In a possible implementation manner, the duration corresponding to the smooth transition is at least within the time period of the current time;

[0019] Alternatively, the duration corresponding to the smooth transition is completely within the adjacent time periods.

[0020] In one possible implementation, if the adjacent time period is the previous time period corresponding to the time period in which the current time is located, and the duration corresponding to the smooth transition is at least within the time period in which the current time is located, controlling the duty cycle used by the blue light to smoothly transition between the adjacent time period and the time period in which the current time is located includes:

[0021] During the beginning portion of the time period corresponding to the current time period, the duty cycle of the blue light is gradually adjusted according to a preset period and a preset change amount, starting from the duty cycle corresponding to the blue light last used in the previous time period until the fourth duty cycle is reached.

[0022] In one possible implementation, starting from the third duty cycle used in the previous time period, and according to a preset period and a preset change amount, the duty cycle of the blue light is gradually adjusted until it reaches a fourth duty cycle corresponding to the time period of the current time, including:

[0023] If the third duty cycle is smaller than the fourth duty cycle, then gradually increasing the duty cycle of the blue light from the third duty cycle according to the preset period and the preset change amount until reaching the fourth duty cycle;

[0024] If the third duty cycle is greater than the second duty cycle, the duty cycle of the blue light is gradually reduced starting from the third duty cycle according to the preset period and the preset change amount until it reaches the fourth duty cycle.

[0025] In one possible implementation, determining whether a third duty cycle used by blue light in an adjacent time period adjacent to the time period in which the current time falls is the same as a fourth duty cycle used by blue light in the time period in which the current time falls includes:

[0026] Determining whether the operating mode corresponding to the current time has changed compared to the operating mode corresponding to the previous time; wherein the operating mode includes a day mode, a night mode, and a transition mode from the day mode to the night mode; the data storage table is used to store the duty ratios of rhythmic blue light and low blue light corresponding to different operating modes, and different operating modes correspond to different time periods;

[0027] If a change occurs, determining that the third duty cycle is different from the fourth duty cycle;

[0028] If no change occurs, it is determined that the third duty cycle is the same as the fourth duty cycle.

[0029] In one possible implementation, if the adjacent time period is the next time period corresponding to the current time period, and the duration corresponding to the smooth transition is completely within the adjacent time period, controlling the duty cycle of the blue light to smoothly transition between the adjacent time period and the time period in which the current time is located includes:

[0030] During the last part of the time period of the current time, the duty cycle of the blue light is gradually adjusted starting from the fourth duty cycle according to a preset period and a preset change amount until it reaches the third duty cycle corresponding to the next time period.

[0031] In one possible implementation, starting from the fourth duty cycle according to a preset period and a preset change amount, the duty cycle of the blue light is gradually adjusted until it reaches the third duty cycle corresponding to the next time period, including:

[0032] If the third duty cycle is less than the fourth duty cycle, gradually reducing the duty cycle of the low blue light from the fourth duty cycle according to the preset period and the preset change amount until reaching the third duty cycle;

[0033] If the third duty cycle is greater than the fourth duty cycle, the duty cycle of the low blue light is gradually increased starting from the fourth duty cycle according to the preset period and the preset change amount until reaching the second duty cycle.

[0034] In a second aspect, an embodiment of the present disclosure provides a backlight source, comprising:

[0035] A first light-emitting device and a second light-emitting device; the blue light peak of the first light-emitting device is a first peak, the blue light peak of the second light-emitting device is a second peak, and the first peak is greater than the second peak;

[0036] A controller, configured to execute the method according to the first aspect;

[0037] a first driving circuit connected between the first light-emitting device and the controller, the first driving circuit being configured to obtain the first duty cycle from the controller and control the first light-emitting device to emit light according to the first duty cycle;

[0038] The second driving circuit is connected between the second light emitting device and the controller. The second driving circuit obtains the first duty cycle from the controller and controls the second light emitting device to emit light according to the second duty cycle.

[0039] In a third aspect, an embodiment of the present disclosure provides a display device, comprising:

[0040] The backlight source according to the second aspect;

[0041] The main system is used to obtain the current time of the display device and provide it to the backlight source.

[0042] In a possible implementation manner, the display device further includes:

[0043] The first connector is connected between the backlight source and the system, and is used to transmit the current time and the working mode corresponding to the time period of the current time to the backlight source.

[0044] In a possible implementation manner, the first connector includes:

[0045] Mode signal line, the signal transmitted by the mode signal line includes a high level signal, a low level signal and a null signal, and the signal on the mode signal line is used to indicate the working mode corresponding to the time period of the current time.

[0046] In a possible implementation manner, the display device further includes:

[0047] Timing controller;

[0048] a second connector connected between the main system and the timing controller, the second connector being used to send the current time to the timing controller;

[0049] The third connector is connected between the timing controller and the backlight source, and is used to transmit the current time received by the timing controller to the backlight source. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] FIG1 is a schematic diagram of the circadian rhythm effect of the human body system;

[0051] FIG2 is a schematic diagram showing changes in melatonin concentration in human blood during a day;

[0052] FIG3 is a schematic structural diagram of a backlight source provided by an embodiment of the present disclosure;

[0053] FIG4 is a schematic structural diagram of a display device provided by an embodiment of the present disclosure;

[0054] FIG5 is a schematic structural diagram of another display device provided by an embodiment of the present disclosure;

[0055] FIG6 is a schematic structural diagram of another display device provided by an embodiment of the present disclosure;

[0056] FIG7 is a flow chart of a backlight control method provided by an embodiment of the present disclosure;

[0057] FIG8 is a control flow chart of another backlight source provided by an embodiment of the present invention.

[0058] Reference numerals: first light emitting device 1 , second light emitting device 2 , controller 3 , first driving circuit 4 , second driving circuit 5 ; main system 100 , backlight source 200 , first connector 300 , timing controller 400 , second connector 500 , third connector 600 . DETAILED DESCRIPTION

[0059] The embodiments of the present disclosure provide a backlight control method, a backlight, and a display device to solve the above-mentioned technical problems existing in the prior art.

[0060] It should be understood that the specific structural and functional details disclosed in the embodiments of the present disclosure are merely representative and are for the purpose of describing exemplary embodiments of the present disclosure. However, the present disclosure can be implemented in many alternative forms and should not be interpreted as being limited to only the embodiments set forth herein.

[0061] In the description of the present disclosure, it should be understood that the terms "center", "lateral", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present disclosure. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, unless otherwise specified, "multiple" means two or more. In addition, the term "include" and any variations thereof are intended to cover non-exclusive inclusions.

[0062] In the description of this disclosure, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on the specific circumstances.

[0063] The terms used in this disclosure are intended only to describe specific embodiments and are not intended to limit the exemplary embodiments. Unless the context clearly indicates otherwise, the singular forms "a", "an", "an item" used herein are also intended to include the plural. It should also be understood that the terms "comprise" and / or "include" used herein specify the presence of stated features, integers, steps, operations, units and / or components, and do not preclude the presence or addition of one or more other features, integers, steps, operations, units, components and / or combinations thereof.

[0064] The term "and / or" in the embodiments of the present disclosure is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0065] In order to make the above-mentioned purposes, features and advantages of the present disclosure more obvious and easy to understand, the present disclosure will be further described below with reference to the accompanying drawings and examples. However, the example embodiments can be implemented in various forms and should not be understood as being limited to the embodiments set forth herein; on the contrary, these embodiments are provided to make the present disclosure more comprehensive and complete, and to fully convey the concepts of the example embodiments to those skilled in the art. The same figure marks in the figures represent the same or similar structures, and their repeated descriptions will be omitted. The words expressing position and direction described in the present disclosure are all explained using the accompanying drawings as examples, but changes can be made as needed, and all changes are included in the scope of protection of the present disclosure. The drawings of the present disclosure are only used to illustrate relative position relationships and do not represent true proportions.

[0066] It should be noted that specific details are set forth in the following description to facilitate a full understanding of the present disclosure. However, the present disclosure can be implemented in a variety of ways different from those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present disclosure. Therefore, the present disclosure is not limited to the specific embodiments disclosed below. The subsequent description of the specification is a preferred embodiment of the present disclosure, but the description is for the purpose of illustrating the general principles of the present disclosure and is not intended to limit the scope of the present disclosure. The scope of protection of the present disclosure shall be as defined by the appended claims.

[0067] Circadian rhythm is the body's internal biological clock that runs on a 24-hour basis and is controlled by the day-night cycle.

[0068] The circadian rhythm is a constant rhythm that lasts approximately 24 hours and is determined by the body's response to daylight. All living organisms have their own internal clock, but a master clock exists in the brain that synchronizes all external input. In vertebrates, the suprachiasmatic nucleus (SCN), a cluster of approximately 20,000 nerve cells (neurons), functions as this master clock. The SCN is part of the hypothalamus and receives direct input from the eyes. The human body has its own circadian rhythm, or biological clock. This clock regulates various physiological and behavioral processes, such as sleep-wake cycles, body temperature fluctuations, and hormone secretion. The body's circadian rhythm can be adjusted and maintained by internal and external environmental factors, particularly light exposure and activity schedules. For example, a good day-night routine and a regular sleep schedule can help the body establish a healthy circadian rhythm. Alternatively, some people may use artificial light or medication to adjust their circadian rhythm, particularly to adjust for jet lag or treat sleep disorders. As shown in Figures 1 and 2, Figure 1 is a schematic diagram of the circadian rhythm effect of the human body system, and Figure 2 is a schematic diagram of the changes in melatonin concentration in human blood during a day.

[0069] In our daily lives, artificial light of various spectrums permeates our lives. It is ubiquitous, day and night, and has a significant impact on our physiology, including disruptions to our circadian rhythms. Light is the most important factor in regulating the human circadian rhythm. The suprachiasmatic nucleus in the brain is the central clock responsible for integrating external light signals and transmitting melatonin to the periphery. Melatonin levels determine whether sleep is delayed and the quality of sleep. Different wavelengths of light have different effects on melatonin suppression. Blue light with a peak wavelength of 480nm, which is the wavelength most sensitive to melanin, has the strongest inhibitory effect. Therefore, especially at night, we do not want products emitting excessive amounts of blue light in this wavelength to suppress melatonin and disrupt sleep. Therefore, display products should provide rhythm adjustment functions for users to choose.

[0070] A backlight control method, a backlight source, and a display device provided by embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0071] FIG3 is a schematic diagram of a backlight source according to an embodiment of the present disclosure, wherein the backlight source includes:

[0072] A first light-emitting device 1 and a second light-emitting device 2; the blue light peak of the first light-emitting device 1 is the first peak, and the blue light peak of the second light-emitting device 2 is the second peak, with the first peak being greater than the second peak; the first peak is 480nm, and the second peak is 450nm. This allows the first light-emitting device 1 to emit rhythmic blue light with a blue peak of 480nm, which can inhibit the formation of melatonin, while the second light-emitting device 2 emits low-blue light with a blue peak of 450nm, which has little effect on the formation of melatonin. The first light-emitting device 1 and the second light-emitting device 2 can be discrete components (different lamp beads) or contained in the same component (the same lamp bead). If the first light-emitting device 1 and the second light-emitting device 2 are discrete components, multiple first light-emitting devices 1 and multiple second light-emitting devices 2 can be formed into light strips and spaced apart in the backlight panel. If the first light-emitting device 1 and the second light-emitting device 2 are contained in the same lamp bead, multiple lamp beads can be formed into light strips and placed in the backlight panel. The white point coordinates corresponding to the first light-emitting device 1 and the second light-emitting device 2 are consistent.

[0073] The controller 3 is used to determine the duty cycle of the first light-emitting device 1 and the second light-emitting device 2 according to the current time, and provide them to the first drive circuit 4 and the second drive circuit 5 respectively. The specific control scheme is introduced in the subsequent control method and is not repeated here;

[0074] The first driving circuit 4 is connected between the first light emitting device 1 and the controller 3. The first driving circuit 4 obtains a first duty cycle from the controller 3 and controls the first light emitting device 1 to emit light according to the first duty cycle.

[0075] The second driving circuit 5 is connected between the second light emitting device 2 and the controller 3. The second driving circuit 5 obtains the first duty cycle from the controller 3 and controls the second light emitting device 2 to emit light according to the second duty cycle.

[0076] The controller 3 determines the first duty cycle corresponding to the first light-emitting device 1 and the second duty cycle corresponding to the second light-emitting device 2 according to the current time, and provides the first duty cycle and the second duty cycle to the first drive circuit 4 and the second drive circuit 5 respectively. The first drive circuit 4 controls the first light-emitting device 1 to emit light according to the first duty cycle, and the second drive circuit 5 controls the second light-emitting device 2 to emit light according to the second duty cycle, thereby automatically controlling the proportion of the rhythmic blue light of the backlight source, ensuring that the rhythmic blue light with the first peak value is maintained near the first peak value during the day and near the low blue light with the second peak value at night. Since the rhythmic blue light with the first peak value is used during the day, the circadian stimulation value (CS) generated by the backlight source during the day is higher, which has a greater inhibitory effect on the release of melatonin. The low blue light with the second peak value is used at night, so that the circadian stimulation value generated by the backlight source at night is lower, which has less inhibition on the release of melatonin, thereby achieving the technical effect of automatic adjustment of the circadian stimulation value.

[0077] FIG4 is a schematic structural diagram of a display device according to an embodiment of the present disclosure. The display device includes:

[0078] Backlight source 200 as described above;

[0079] The main system 100 is used to obtain the current time of the display device and provide it to the backlight source 200.

[0080] FIG5 is a schematic diagram of the structure of another display device provided in an embodiment of the present disclosure, wherein the display device further includes:

[0081] The first connector 300 is connected between the backlight source 200 and the system. The first connector 300 is used to transmit the working mode corresponding to the time period of the current time to the backlight source 200 .

[0082] The first connector 300 can be a flat cable or an independent connecting cable. The main system 100 can directly transmit the operating mode corresponding to the time period of the current time to the controller in the backlight source 200 through the first connector 300, without having to transmit the current time to the backlight source 200. This can reduce the amount of data transmission and improve work efficiency. The operating mode can be a day mode, a night mode, or a transition mode from day mode to night mode.

[0083] In some embodiments, if the first connector 300 is a flat cable, the first connector 300 includes:

[0084] Mode signal line: the signals transmitted by the mode signal line include high-level signals, low-level signals and empty signals. The signal on the mode signal line is used to indicate the working mode corresponding to the time period of the current time.

[0085] High level signal, low level signal and no signal can correspond to day mode, night mode and transition mode respectively. H It is a high level signal, less than V L is a low level signal, between V H With V L The time between is a null signal. A high-level signal may correspond to a day mode, a low-level signal may correspond to a night mode, and a null signal may correspond to a transition mode; alternatively, a high-level signal may correspond to a night mode, a low-level signal may correspond to a day mode, and a null signal may correspond to a transition mode; alternatively, a null signal may correspond to a day mode, a high-level signal may correspond to a night mode, and a low-level signal may correspond to a transition mode. The specific correspondence between the high-level signal, the low-level signal, the null signal, and the day mode, the night mode, and the transition mode can be set as needed and is not limited here.

[0086] FIG6 is a schematic structural diagram of another display device provided in an embodiment of the present disclosure, wherein the display device further includes:

[0087] Timing controller 400;

[0088] The second connector 500 is connected between the main system 100 and the timing controller 400, and is used to send the current time to the timing controller 400;

[0089] The third connector 600 is connected between the timing controller 400 and the backlight source 200 . The third connector 600 is used to transmit the current time received by the timing controller 400 to the backlight source 200 .

[0090] The second connector 500 can be a connector connected to a video image interface, and the main system 100 and the timing controller 400 can transmit the current time through an auxiliary channel in the video image interface. The third connector 600 can be a connector corresponding to an I2C interface, and the timing controller 400 can send the current time to the controller in the backlight source 200 through the I2C protocol.

[0091] In the embodiment provided by the present disclosure, the main system 100 provides the current time to the backlight source 200 through the timing control board, and the current time can be transmitted by using the existing circuits in the display device without adding additional circuits.

[0092] The display device may be a liquid crystal display, a liquid crystal display screen, a liquid crystal television or other display device, or may be a mobile device such as a mobile phone, a tablet computer, or a notebook.

[0093] The above describes the hardware structure of the backlight source and the display device including the backlight source. The following describes the working mode of the controller in the above solution.

[0094] Based on the same inventive concept, an embodiment of the present disclosure provides a backlight control method. FIG7 is a flowchart of a backlight control method provided by an embodiment of the present disclosure. The control method includes:

[0095] Step 701: Search the data lookup table for the first duty cycle and the second duty cycle of the rhythmic blue light and the low blue light corresponding to the time period of the current time; wherein, the blue light peak of the rhythmic blue light is the first peak, and the blue light peak of the low blue light is the second peak, and the first peak is greater than the second peak. The data lookup table is used to characterize the duty cycles of the rhythmic blue light and the low blue light corresponding to different time periods; the first peak is 480nm, and the rhythmic blue light with a peak of 480nm has a greater inhibitory effect on the release of melatonin and is suitable for daytime use; the second peak is 450nm, and the low blue light with a peak of 450nm has a smaller inhibitory effect on the release of melatonin and is suitable for nighttime use.

[0096] Step 702: adjusting the proportion of rhythmic blue light in the backlight source according to the first duty cycle and the second duty cycle, so that the circadian rhythm stimulation value generated by the backlight source is within the standard circadian rhythm stimulation value range of the corresponding time period.

[0097] For example, relevant standards stipulate that the circadian rhythm stimulation value of people during daytime activities should be greater than or equal to 0.3 (i.e. CS≥0.3), and the circadian rhythm stimulation value after dusk should be less than or equal to 0.15 (i.e. CS≤0.15). The above range is the standard circadian rhythm stimulation value range.

[0098] The data lookup table can directly store the duty cycles of rhythmic blue light and low blue light corresponding to different time periods, as shown in Table 1, which is applicable to the display device corresponding to Figure 6; the data lookup table can also store the duty cycles of rhythmic blue light and low blue light corresponding to different working modes, as shown in Table 2. Different working modes correspond to different time periods, which is applicable to the display device corresponding to Figure 5.

[0099] If the display device is the display device shown in Figure 5, the backlight source does not need to obtain the current time; if the display device is the display device shown in Figure 6, the backlight source needs to obtain the current time. Please refer to Table 1 for a data lookup table provided in an embodiment of the present disclosure.

[0100] Table 1

[0101] Table 2

[0102] It should be understood that the length of a time period in Table 1 is 1 hour. Taking time period 1:00 in Table 1 as an example, the corresponding time range is: 00:00:00:001 (hour: minute: second: millisecond) to 1:00:00:000 (hour: minute: second: millisecond); the time period corresponding to the daytime mode in Table 2 can be 7:00 (inclusive) to 19:00 (exclusive), the time period corresponding to the transition mode can be 19:00 (inclusive) to 21:00 (exclusive), and the time period corresponding to the night mode is 21:00 (inclusive) to 7:00 (exclusive).

[0103] As shown in Table 1, the first duty cycle corresponding to the time period from 7 to 19 o'clock in the daytime (including 7 o'clock, excluding 19 o'clock) can be set to 40%, and the second duty cycle can be set to 60%. The first duty cycle corresponding to the time period from 19 to 7 o'clock at night (including 19 o'clock, excluding 7 o'clock) can be set to 1%, and the second duty cycle can be set to 99%.

[0104] Time periods can be divided into 24 time periods as shown in Table 1, or roughly divided into daytime and nighttime periods. Time periods can also be divided based on actual needs, with no restrictions here. Time periods corresponding to different working modes can also be freely defined, for example, by referring to the local time zone.

[0105] If the display device is the one shown in FIG5 , the main system obtains the current time and determines the corresponding operating mode based on the time period to which the current time belongs. The main system then transmits the current time to the backlight controller. The controller obtains the duty ratios corresponding to circadian blue light and low blue light from a data lookup table based on the received operating mode, and then adjusts the proportion of circadian blue light in the backlight according to the obtained duty ratio.

[0106] If the display device is the display device shown in Figure 6, the main system transmits the current time to the controller in the backlight source, and the backlight source determines the time period to which the current time belongs, and then obtains the duty cycle corresponding to the rhythmic blue light and low blue light from the data lookup table, and then adjusts the proportion of rhythmic blue light in the backlight source according to the obtained duty cycle.

[0107] If it is determined that the time period to which the current time belongs is 7 to 19 o'clock (daytime mode), which corresponds to the daytime, 40% is transmitted to the first driving circuit as the first duty cycle of the rhythmic blue light to control the first light-emitting device to emit rhythmic blue light with a blue light peak of the first peak, and 60% is transmitted to the second driving circuit as the second duty cycle of the low blue light to control the second light-emitting device to emit low blue light with a blue light peak of the second peak. This makes the proportion of rhythmic blue light in the light emitted by the backlight source during the day higher, and the generated circadian rhythm stimulation value is greater than or equal to 0.3, which has a greater inhibitory effect on the release of melatonin, allowing the user to maintain a better working state during the day;

[0108] When it is determined that the time period to which the current time belongs is 7 p.m. to 7 p.m. (night mode or transition mode) corresponding to the night time, 1% is transmitted to the first driving circuit as the first duty cycle of the rhythmic blue light to control the first light-emitting device to emit rhythmic blue light with a blue light peak of the first peak, and 99% is transmitted to the second driving circuit as the second duty cycle of the low blue light to control the second light-emitting device to emit low blue light with a blue light peak of the second peak. This makes the proportion of rhythmic blue light in the light emitted by the backlight source at night extremely low, and the circadian rhythm stimulation value generated is less than or equal to 0.15, which has a weak inhibitory effect on the release of melatonin, allowing users to produce more melatonin and quickly fall asleep or maintain a good sleep state.

[0109] In the embodiment provided by the present disclosure, by obtaining the current time, and then looking up the first duty cycle and the second duty cycle corresponding to the time period to which the current time belongs from a data lookup table, and adjusting the proportion of rhythmic blue light in the backlight source according to the first expansion ratio and the second duty cycle, the circadian rhythm stimulation value generated by the backlight source is within the standard circadian rhythm stimulation range corresponding to the time period to which the current time belongs, thereby being able to automatically adjust the circadian rhythm stimulation value according to the current time, so that the melatonin produced by the user is in line with the body rhythm of the human body.

[0110] In some embodiments, searching the data lookup table for the first duty cycle and the second duty cycle corresponding to the rhythmic blue light and low blue light corresponding to the time period of the current time can also be achieved in the following manner:

[0111] Determine whether the current time is night time according to the time period to which the current time belongs;

[0112] If yes, the brightness of the backlight source is reduced according to a preset ratio.

[0113] If the display device is the display device shown in Figure 5, then by receiving a signal corresponding to the night mode or transition mode, it can be determined that the current time belongs to night time; if the display device is the display device shown in Figure 6, then based on whether the time period to which the received current time belongs is within the time period corresponding to night time, it can be determined whether the current time belongs to night time.

[0114] At night, ambient brightness is lower than during the day, and the required brightness of the display device is actually lower. If the brightness of the backlight source providing backlight for the display device remains the same as during the day, it will cause glare to the user, reducing the user experience. This disclosure reduces the brightness of the backlight source at night. Because the second duty cycle corresponding to low blue light at night is extremely high, while the first duty cycle corresponding to rhythmic blue light is extremely low, the brightness of the backlight source at night can be reduced by reducing the second duty cycle corresponding to low blue light.

[0115] In addition, in the evening, which is the period when day turns to night, such as from 7 to 20 o'clock, when the ambient light gradually weakens, the brightness of the backlight source can be set to an intermediate brightness so that the color temperature and display quality of the display device including the backlight source of the present disclosure are within the user's acceptable range.

[0116] Please refer to Table 3 for another data lookup table provided in an embodiment of the present disclosure.

[0117] Table 3

[0118] As shown in Table 3, the duty cycle of low blue light corresponding to night mode and transition mode is 99%, the corresponding preset ratio for 21:00 to 7:00 (including 21:00, excluding 7:00) in night mode and transition mode is 33%, and the corresponding preset ratio for 19:00 to 21:00 (including 19:00, excluding 21:00) in night mode is 68%. In this way, when the current time period is from 21:00 to 7:00, the first duty cycle is 1%, and the second duty cycle is 99%×33%; when the current time period is from 19:00 to 21:00, the first duty cycle is 1%, and the second duty cycle is 99%×68%, thereby reducing the brightness of the backlight source on the LCD, and the brightness during the day can be gradually reduced to the brightness at night, so that the color temperature and display quality of the backlight source can be maintained within the acceptable range for users, thereby improving the user experience.

[0119] The above preset ratio can also be set according to the lighting conditions of different regions, and the time period for setting the preset ratio can also be selected according to actual conditions, which is not limited here.

[0120] In some embodiments, reducing the brightness of the backlight source according to a preset ratio includes:

[0121] According to the preset ratio, the duty cycle of the low blue light corresponding to the time period to which the current time belongs is obtained from the data lookup table, so as to obtain a second duty cycle corresponding to the low blue light.

[0122] For example, the current time is 19:34, and the time period to which the current time belongs is determined to be 19 (i.e., 19 to 20, including 19 and excluding 20). From the data lookup table corresponding to Table 3, it is found that the first duty cycle corresponding to rhythmic blue light is 1%, the duty cycle corresponding to low blue light is 99%, and the preset ratio is 68%. 99%×68% is used as the second duty cycle.

[0123] For example, the signal corresponding to the night mode is currently received, and the first duty cycle corresponding to rhythmic blue light is found to be 1% from data lookup table 2, the duty cycle corresponding to low blue light is 99%, and the preset ratio is 33%. 99%×33% is used as the second duty cycle.

[0124] In practical applications, since the preset ratios corresponding to the various time periods at night are predetermined, the values ​​of the second duty cycles in the corresponding time periods can be directly recorded in the data lookup table, eliminating the need for further calculations, thereby effectively improving work efficiency.

[0125] In the embodiment provided in the present disclosure, since most of the light sources providing brightness for the backlight source at night come from the second light-emitting device corresponding to low blue light, the brightness of the backlight source at night can be effectively reduced by reducing the second duty cycle corresponding to low blue light.

[0126] In other embodiments, after determining the first duty cycle corresponding to rhythmic blue light and the second duty cycle corresponding to low blue light, the first duty cycle and the second duty cycle may be balanced when switching between different operating modes. This may be achieved in the following manner:

[0127] Determine whether the third duty cycle used by blue light in an adjacent time period adjacent to the time period of the current time is the same as the fourth duty cycle used by blue light in the time period of the current time; wherein, blue light includes rhythmic blue light and low blue light; the adjacent time period can be the previous time period corresponding to the time period of the current time, or it can be the next time period corresponding to the time period of the current time.

[0128] If they are different, the duty cycle of the blue light is controlled to smoothly transition between the adjacent time periods and the time period of the current time.

[0129] In some embodiments, the duration corresponding to the smooth transition is at least within the time period of the current time;

[0130] Alternatively, the duration corresponding to the smooth transition is completely within the adjacent time periods.

[0131] For example, taking Table 3 as a data lookup table, the current time is 6:25, and the time period to which the current time belongs is 6:00. Through the data lookup table, it can be known that the adjacent time periods adjacent to the time period 6:00 are time period 5:00 and time period 7:00. Among them, the duty cycle corresponding to the rhythmic blue light in time period 5:00 and time period 6:00 is 1%, and the duty cycle corresponding to the low blue light is 99%×33%. The duty cycle corresponding to the blue light in time period 7:00 is 40%, and the duty cycle corresponding to the low blue light is 60%. Therefore, it can be determined that the fourth duty cycle used by blue light in time period 6:00 (i.e., the duty cycle corresponding to rhythmic blue light is 1%, and the duty cycle corresponding to low blue light is 99%×33%) is the same as the third duty cycle used by blue light in time period 5:00 (i.e., the duty cycle corresponding to rhythmic blue light is 1%, and the duty cycle corresponding to low blue light is 99%×33%). The fourth duty cycle used by blue light in time period 6:00 is different from the fourth duty cycle used by blue light in time period 7:00 (i.e., the duty cycle corresponding to blue light is 40%, and the duty cycle corresponding to low blue light is 60%). Therefore, it is necessary to control the duty cycle used by blue light (i.e., rhythmic blue light and low blue light) to smoothly transition between time period 6:00 and time period 7:00.

[0132] The duration corresponding to the smooth transition can be completely located in the time period 6:00, that is, the smooth transition is implemented within the last period of the time period 6:00; or, the duration corresponding to the smooth transition can also be completely located in the time period 7:00, that is, no smooth transition is implemented in the time period 6:00, but a smooth transition is implemented within the time period starting from the time period 7:00; or, the duration corresponding to the smooth transition can be partially located in the last period of the time period 6:00, and the other part can be located in the time period starting from the time period 7:00, so that a partial smooth transition can be implemented in the last period of the time period 6:00, and the remaining smooth transition can be implemented in the time period starting from the time period 7:00.

[0133] For another example, still taking Table 3 as the data lookup table, the current time is 20:15, and the time period to which the current time belongs is the time period 20:00. Through the data lookup table, it can be known that the adjacent time periods adjacent to the time period 20:00 are the time period 19:00 and the time period 21:00. Among them, the corresponding duty cycle of rhythmic blue light in the time period 19:00 and the time period 20:00 is 1%, and the corresponding duty cycle of low blue light is 99%×68%. The corresponding duty cycle of rhythmic blue light in the time period 21:00 is 1%, and the corresponding duty cycle of low blue light is 99%×33%. Therefore, it can be determined that the third duty cycle used by blue light in the time period 19:00 is the same as the fourth duty cycle used by blue light in the time period 20:00, and the third duty cycle used by blue light in the time period 21:00 (i.e., the duty cycle used by low blue light is 99% × 33%) is different from the fourth duty cycle used by blue light in the UI time period 20:00 (i.e., the duty cycle used by low blue light is 99% × 68%), which needs to be greater than the duty cycle used to control the low blue light to smoothly transition between the time period 20:00 and the time period 21:00.

[0134] The duration corresponding to the smooth transition can be completely located in the time period 20:00, that is, the smooth transition is implemented within the last duration of the time period 20:00; or, the duration corresponding to the smooth transition can also be completely located in the time period 21:00, that is, the smooth transition is not implemented in the time period 20:00, but is implemented within the duration starting from the time period 21:00; or, the duration corresponding to the smooth transition can be partially located in the last duration of the time period 20:00, and the other part can be located in the duration starting from the time period 21:00, so that a partial smooth transition can be implemented in the last duration of the time period 20:00, and the remaining smooth transition can be implemented in the duration starting from the time period 21:00.

[0135] In the embodiment provided by the present disclosure, after determining that the third duty cycle used for blue light in an adjacent time period adjacent to the time period where the current time is located is different from the fourth duty cycle used for blue light in the time period where the current time is located, a smooth transition is performed on the duty cycle used for blue light between the adjacent time periods and the time period where the current time is located. When switching between different working modes, the screen color temperature and brightness of the display device including the above-mentioned backlight source will not change suddenly, thereby improving the display quality while meeting the rhythm requirements.

[0136] In other embodiments, determining whether the third duty cycle used by the blue light in the adjacent time period adjacent to the time period in which the current time falls is the same as the fourth duty cycle used by the blue light in the time period in which the current time falls may also be achieved by:

[0137] Determine whether the working mode corresponding to the current time has changed compared to the working mode corresponding to the previous time; wherein the working mode includes day mode, night mode, and a transition mode from day mode to night mode; the data storage table is used to store the duty cycle of rhythmic blue light and low blue light corresponding to different working modes, and different working modes correspond to different time periods;

[0138] If a change occurs, determining that the third duty cycle is different from the fourth duty cycle;

[0139] If no change occurs, it is determined that the third duty cycle is the same as the fourth duty cycle.

[0140] For example, the display device uses the display device shown in Figure 5. The working mode corresponding to the previous time is the daytime mode, and the working mode signal received at the current time is the signal corresponding to the transition mode. It can be determined that the working mode has changed at the current time, and then the third duty cycle of blue light use in the adjacent time period adjacent to the time period of the current time is determined, which is different from the fourth duty cycle of blue light use in the time period of the current time. It is necessary to control the duty cycle of blue light use to smoothly transition between the adjacent time periods and the time period of the current time.

[0141] In some embodiments, if the adjacent time period is the previous time period corresponding to the time period in which the current time is located, and the duration corresponding to the smooth transition is at least within the time period in which the current time is located, controlling the duty cycle used by blue light to smoothly transition between the adjacent time period and the time period in which the current time is located includes:

[0142] During the beginning portion of the time period corresponding to the current time period, the duty cycle of the blue light is gradually adjusted according to a preset period and a preset change amount, starting from the duty cycle corresponding to the blue light last used in the previous time period until the fourth duty cycle is reached.

[0143] The blue light duty cycle is gradually adjusted from the third duty cycle used in the previous time period until it reaches the fourth duty cycle corresponding to the current time period according to the preset period and the preset change amount. This can be achieved by:

[0144] If the third duty cycle is less than the fourth duty cycle, then starting from the third duty cycle and according to a preset period and a preset change amount, the duty cycle of the blue light is gradually increased until it reaches the fourth duty cycle;

[0145] If the third duty cycle is greater than the second duty cycle, the duty cycle of the blue light is gradually reduced starting from the third duty cycle according to a preset period and a preset change amount until it reaches a fourth duty cycle.

[0146] For example, the preset period is 20ms, the preset change is 0.083%, the time period of the current time (7:00) is the time period 7:00 in Table 3, and the adjacent time period is the previous time period of time period 7:00 (that is, time period 6:00). It can be seen from Figure 3 that the fourth duty cycle of blue light used in time period 7:00 is: the duty cycle of rhythmic blue light is 40%, and the duty cycle of low blue light is 60%. The third duty cycle of blue light used in time period 6:00 is: rhythmic blue light is 1%, and low blue light is 99%×33%.

[0147] If the duration corresponding to the smooth transition is all in the time period 7:00, then starting from the current time 7:00, the first duty cycle of rhythmic blue light increases from 1% to 40% according to the preset change amount of 0.083% per cycle (20ms per cycle), and the second duty cycle of low blue light increases from 99%×33%≈33% to 60% according to the preset change amount of 0.083% per cycle (20ms per cycle).

[0148] If part of the duration corresponding to the smooth transition is in the time period 6:00 and the other part is in the time period 7:00, assuming that the duty cycle of rhythmic blue light last used in the time period 6:00 was 25% and the duty cycle of low blue light last used was 50%, then starting from the current time 7:00, the first duty cycle of rhythmic blue light increases from 25% to 40% according to the preset change amount of 0.083% per cycle (20ms per cycle), and the second duty cycle of low blue light increases from 50% to 60% according to the preset change amount of 0.083% per cycle (20ms per cycle).

[0149] For another example, the preset period is 20ms, the preset change is 0.083%, the time period of the current time (21:00) is the time period 21:00 in Table 3, and the adjacent time period is the previous time period of the time period 20:00 (that is, the time period 20:00). It can be seen from Figure 3 that the fourth duty cycle used by blue light in the time period 21:00 is: the duty cycle of low blue light is 99%×33%≈33%, and the third duty cycle used by blue light in the time period 20:00 is: low blue light is 99%×68%≈68%.

[0150] If the duration of the smooth transition is always within the 21:00 time period, the second duty cycle of the low blue light mode will be gradually reduced from 68% to 33% at a preset increment of 0.083% per cycle (20ms per cycle) starting from the current 21:00 time period. Since the duty cycle of the rhythmic blue light mode is the same during the 20:00 and 21:00 time periods, the first duty cycle of the rhythmic blue light mode does not need to be adjusted and can be maintained at 1%.

[0151] If the duration of the smooth transition falls partially at 20:00 and partially at 21:00, and the last low blue light duty cycle at 20:00 was 45%, then the second low blue light duty cycle at the current 21:00 will be gradually reduced from 45% to 33% by a preset increment of 0.083% per cycle (20ms per cycle). The first duty cycle corresponding to the rhythmic blue light does not need to be adjusted and can remain at 1%.

[0152] In other embodiments, if the adjacent time period is the next time period corresponding to the current time period, and the duration corresponding to the smooth transition is completely within the adjacent time period, the duty cycle of the blue light is controlled to smoothly transition between the adjacent time period and the current time period, which can be achieved by the following methods:

[0153] During the last part of the time period of the current time, the duty cycle of the blue light is gradually adjusted starting from the fourth duty cycle according to a preset period and a preset change amount until it reaches the third duty cycle corresponding to the next time period.

[0154] The step of gradually adjusting the duty cycle of the blue light starting from the fourth duty cycle according to a preset period and a preset variation until reaching the third duty cycle corresponding to the next time period can be achieved by:

[0155] If the third duty cycle is less than the fourth duty cycle, then starting from the fourth duty cycle, the duty cycle of the low blue light is gradually reduced according to a preset period and a preset change amount until it reaches the third duty cycle;

[0156] If the third duty cycle is greater than the fourth duty cycle, the duty cycle of the low blue light is gradually increased starting from the fourth duty cycle according to a preset period and a preset change amount until the second duty cycle is reached.

[0157] For example, the preset period is 20ms, the preset change is 0.083%, the time period of the current time (6:00) is the time period 6:00 in Table 3, and the adjacent time period is the next time period of time period 6:00 (that is, time period 7:00). It can be seen from Figure 3 that the third duty cycle of blue light used in time period 7:00 is: the duty cycle of rhythmic blue light is 40%, and the duty cycle of low blue light is 60%. The fourth duty cycle of blue light used in time period 6:00 is: rhythmic blue light is 1%, and low blue light is 99%×33%≈33%.

[0158] If it takes 9.36s for the first duty cycle of rhythmic blue light to increase from 1% to 40% with a preset period of 20ms and a preset change of 0.083%, and it takes 6.559s for the second duty cycle of low blue light to increase from 33% to 60% with a preset period of 20ms and a preset change of 0.083%, then starting from time 6:59:50:640 (hour: minute: second: millisecond) in the time period 6:00, the first duty cycle of rhythmic blue light increases from 1% to 40% with a preset period of 20ms and a preset change of 0.083%, and starting from time 6:59:53:441 (hour: minute: second: millisecond) in the time period 6:00, the second duty cycle of low blue light increases from 33% to 60% with a preset period of 20ms and a preset change of 0.083%.

[0159] For another example, the preset period is 20ms, the preset change is 0.083%, the current time (20:00) is the time period 20:00 in Table 3, and the adjacent time period is the next time period of the time period 20:00 (that is, the time period 21:00). It can be seen from Figure 3 that the third duty cycle used by blue light in the time period 21:00 is: the duty cycle of low blue light is 99%×68%≈68%, and the fourth duty cycle used by blue light in the time period 20:00 is: low blue light is 99%×33%≈33%.

[0160] If the second duty cycle of low blue light decreases from 68% with a preset period of 20ms and a preset increment of 0.083% and then increases to 33% in 8.316 seconds, then starting at 20:59:51:684 (hour:minute:second:millisecond) in the time period 20:00, the second duty cycle of low blue light decreases from 68% to 33% with a preset period of 20ms and a preset increment of 0.083%. Since the first duty cycle corresponding to rhythmic blue light is the same during the time periods 20:00 and 21:00, it only needs to be maintained at 1%.

[0161] For example, please refer to FIG8 , which is a control flow chart of another backlight source provided by an embodiment of the present invention.

[0162] Step 800: Start;

[0163] Step 801: The system is always initialized;

[0164] Step 802: Initialize peripherals;

[0165] Step 803: Application initialization;

[0166] Step 804: timing processing;

[0167] After the controller is powered on, steps 800 to 804 are executed.

[0168] Step 805: Get the current time;

[0169] Step 806: Read the current duty cycle;

[0170] Step 807: preset time interval, mode switching;

[0171] Step 808: Calculate the duty cycle value corresponding to the mode;

[0172] Step 809: whether the duty cycle is calculated for the first time;

[0173] The controller determines whether it is the first time to calculate the duty cycle, and if so, executes step 810 ; otherwise, executes step 811 .

[0174] Step 810: assigning the target duty cycle value to the actual duty cycle value;

[0175] Step 811: Obtain a data lookup table;

[0176] The data lookup table is the data lookup table shown in Table 1.

[0177] Step 812: Check whether the interval time has expired;

[0178] Determine whether the mode switching interval has arrived. If so, execute step 813; otherwise, execute step 804.

[0179] Step 813: Whether the actual duty cycle value is equal to the target duty cycle value;

[0180] It is determined whether the actual duty cycle of the driving circuit is the same as the target duty cycle provided by the controller to the driving circuit. If they are the same, step 814 is executed. If they are different, step 804 is executed. The driving circuit includes a first driving circuit and a second driving circuit.

[0181] Step 814: Duty cycle adjustment;

[0182] Step 815: The duty cycle is re-output;

[0183] Step 816: Output the duty cycle to the driving circuit in the backlight source.

[0184] It should be understood that the preset period and the preset change amount in the above examples can also be other values ​​and can be freely set according to actual needs, and are not limited here.

[0185] Although the preferred embodiments of the present disclosure have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present disclosure.

[0186] Obviously, those skilled in the art may make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include these modifications and variations.

Claims

1. A method for controlling a backlight source, wherein: include: Searching the data lookup table for the first duty cycle and the second duty cycle of the rhythmic blue light and the low blue light corresponding to the time period of the current time; wherein the blue light peak of the rhythmic blue light is the first peak value, the blue light peak of the low blue light is the second peak value, the first peak value is greater than the second peak value, and the data lookup table is used to represent the duty cycles of the rhythmic blue light and the low blue light corresponding to different time periods; According to the first duty cycle and the second duty cycle, the proportion of the rhythmic blue light in the backlight source is adjusted so that the circadian rhythm stimulation value generated by the backlight source is within the standard circadian rhythm stimulation value range of the corresponding time period.

2. The control method according to claim 1, wherein: Searching the data lookup table for the first duty cycle and the second duty cycle corresponding to the rhythmic blue light and the low blue light corresponding to the time period of the current time, including: Determining whether the current time belongs to nighttime according to the time period to which the current time belongs; If yes, the brightness of the backlight source is reduced according to a preset ratio.

3. The control method according to claim 2, wherein: Reducing the brightness of the backlight source according to a preset ratio includes: According to the preset ratio, the duty cycle of the low blue light corresponding to the time period to which the current time belongs is obtained from the data lookup table, so as to obtain a second duty cycle corresponding to the low blue light.

4. The control method according to claim 2, wherein: After determining the first duty cycle corresponding to the rhythmic blue light and the second duty cycle corresponding to the low blue light, the method further includes: Determining whether a third duty cycle of blue light used in an adjacent time period adjacent to the time period in which the current time falls is the same as a fourth duty cycle of blue light used in the time period in which the current time falls; wherein the blue light includes the rhythmic blue light and the low blue light; If they are different, the duty cycle of the blue light is controlled to smoothly transition between the adjacent time periods and the time period where the current time is located.

5. The control method according to claim 4, wherein: The duration corresponding to the smooth transition is at least within the time period of the current time; Alternatively, the duration corresponding to the smooth transition is completely within the adjacent time periods.

6. The control method according to claim 5, wherein: If the adjacent time period is the previous time period corresponding to the time period in which the current time is located, and the duration corresponding to the smooth transition is at least within the time period in which the current time is located, controlling the duty cycle used by the blue light to smoothly transition between the adjacent time period and the time period in which the current time is located includes: During the beginning portion of the time period corresponding to the current time period, the duty cycle of the blue light is gradually adjusted according to a preset period and a preset change amount, starting from the duty cycle corresponding to the blue light last used in the previous time period until the fourth duty cycle is reached.

7. The control method according to claim 6, wherein: Gradual adjustment of the duty cycle of the blue light, starting from the third duty cycle used in the previous time period according to a preset period and a preset change amount, until reaching a fourth duty cycle corresponding to the time period of the current time, includes: If the third duty cycle is smaller than the fourth duty cycle, then gradually increasing the duty cycle of the blue light from the third duty cycle according to the preset period and the preset change amount until reaching the fourth duty cycle; If the third duty cycle is greater than the second duty cycle, the duty cycle of the blue light is gradually reduced starting from the third duty cycle according to the preset period and the preset change amount until it reaches the fourth duty cycle.

8. The control method according to claim 6 or 7, wherein: Determining whether a third duty cycle used by blue light in an adjacent time period adjacent to the time period in which the current time is located is the same as a fourth duty cycle used by blue light in the time period in which the current time is located includes: Determining whether the operating mode corresponding to the current time has changed compared to the operating mode corresponding to the previous time; wherein the operating mode includes a day mode, a night mode, and a transition mode from the day mode to the night mode; the data storage table is used to store the duty ratios of rhythmic blue light and low blue light corresponding to different operating modes, and different operating modes correspond to different time periods; If a change occurs, determining that the third duty cycle is different from the fourth duty cycle; If no change occurs, it is determined that the third duty cycle is the same as the fourth duty cycle.

9. The control method according to claim 5, wherein: If the adjacent time period is a time period next to the current time period, and the duration corresponding to the smooth transition is completely within the adjacent time period, controlling the duty cycle of the blue light to smoothly transition between the adjacent time period and the time period in which the current time is located includes: During the last part of the time period of the current time, the duty cycle of the blue light is gradually adjusted starting from the fourth duty cycle according to a preset period and a preset change amount until it reaches the third duty cycle corresponding to the next time period.

10. The control method according to claim 9, wherein: Gradual adjustment of the duty cycle of the blue light starting from the fourth duty cycle according to a preset period and a preset change amount until reaching a third duty cycle corresponding to the next time period includes: If the third duty cycle is less than the fourth duty cycle, gradually reducing the duty cycle of the low blue light from the fourth duty cycle according to the preset period and the preset change amount until reaching the third duty cycle; If the third duty cycle is greater than the fourth duty cycle, the duty cycle of the low blue light is gradually increased starting from the fourth duty cycle according to the preset period and the preset change amount until reaching the second duty cycle.

11. A backlight source, wherein: include: a first light emitting device and a second light emitting device; The blue light peak value of the first light emitting device is a first peak value, the blue light peak value of the second light emitting device is a second peak value, and the first peak value is greater than the second peak value; A controller, configured to execute the method according to any one of claims 1 to 10; a first driving circuit connected between the first light-emitting device and the controller, the first driving circuit being configured to obtain the first duty cycle from the controller and control the first light-emitting device to emit light according to the first duty cycle; The second driving circuit is connected between the second light emitting device and the controller, and the second driving circuit is used to obtain the first duty cycle from the controller and control the light emitting device according to the second duty cycle. The second light emitting device emits light.

12. A display device, wherein: include: The backlight source according to claim 11; The main system is used to obtain the current time of the display device and provide it to the backlight source.

13. The display device according to claim 12, wherein: Also includes: The first connector is connected between the backlight source and the system, and is used to transmit the current time and the working mode corresponding to the time period of the current time to the backlight source.

14. The display device according to claim 13, wherein: The first connector includes: Mode signal line, the signal transmitted by the mode signal line includes a high level signal, a low level signal and a null signal, and the signal on the mode signal line is used to indicate the working mode corresponding to the time period of the current time.

15. The display device according to claim 12, wherein: Also includes: Timing controller; a second connector connected between the main system and the timing controller, the second connector being used to send the current time to the timing controller; The third connector is connected between the timing controller and the backlight source, and is used to transmit the current time received by the timing controller to the backlight source.

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