Device and method for display control, and display device

Abstract

The present disclosure provides a device and a method for display control, as well as a display device, which can be applied in the field of display technology. The device for display control comprises: a first control circuit configured to control a display device in response to a detected display mode switching instruction to switch from a first display mode to a second display mode, such that it enters a display transition period, that it allows a first control signal to be at an active level at a first predetermined time during the display transition period, and that it allows a second control signal to be at an inactive level at a second predetermined time during the display transition period;and a display circuit configured to control the display device in the second display mode during a display period, in response to a detection that the second control signal is at the inactive level, according to the first control signal, wherein the second control signal is configured to control the display device to display in the first display mode;

Description

AREA OF TECHNOLOGY The present disclosure relates to a field of display technology, in particular to a device and a method for display control as well as to a display device. STATE OF THE ART With the development of information science and technology, display technology has also evolved. A display device can have a variety of display modes, and in different usage scenarios, the display device can show content in a mode that corresponds to the specific usage scenario. SUMMARY In view of the above problems, the present disclosure provides a device and a method for display control as well as a display device. In a first aspect of the present disclosure, a display control device is provided, comprising: a first control circuit configured to control a display device in response to a detected display mode switching instruction to switch from a first display mode to a second display mode, to allow a first control signal to be at an active level at a first predetermined time during the display transition period, and to allow a second control signal to be at an inactive level at a second predetermined time during the display transition period; and a display circuit configured to control the display device in the second display mode in response to a detection during a display period that the second control signal is at the inactive level, according to the first control signal.where the second control signal is configured to control the display device so that it displays in the first display mode. In a second aspect of the present disclosure, a display device is provided comprising: the display control device according to the embodiments of the present disclosure; and a display module configured to display in a second display mode according to a first control signal provided by the display control device. In a third aspect of the present disclosure, a display control method is provided which is applicable to the display control device according to embodiments of the present disclosure, the method comprising: Controlling a display device in response to a detected display mode switching instruction to switch from a first display mode to a second display mode in order to enter a display transition period; allowing a first control signal to be at an active level at a first predetermined time of the display transition period; and allowing a second control signal to be at an inactive level at a second predetermined time of the display transition period, using a first control circuit; and Controlling the display device to display in the second display mode, according to the first control signal during a display period, in response to a detection that the second control signal is at the inactive level, using a display circuit; wherein the second control signal is configured to control the display device to display in the first display mode. BRIEF DESCRIPTION OF THE FIGURES The above-mentioned contents and other objectives, features, and advantages of the present disclosure will become clearer through the following descriptions of embodiments of the present disclosure with reference to the accompanying drawings. In the accompanying drawings: Fig. 1A schematically shows a signal control for a first display mode and a second display mode according to an example; Fig. 1B schematically shows a signal timing diagram of switching from the first display mode to the second display mode according to the example; Fig. 2A schematically shows a block diagram of a display control device according to an embodiment of the present disclosure; Fig. 2B schematically shows a signal timing diagram of a display control device according to an embodiment of the present disclosure; Fig.Figure 3A schematically shows a signal timing diagram of the switching from the first display mode to the second display mode according to one embodiment of the present disclosure; Figure 3B schematically shows a signal timing diagram of a display control device according to another embodiment of the present disclosure; Figure 3C schematically shows a signal timing diagram of a display control device according to another embodiment of the present disclosure; Figure 3D schematically shows a signal timing diagram of a display control device according to another embodiment of the present disclosure; Figure 3E schematically shows a signal timing diagram of a display control device according to another embodiment of the present disclosure; Figure 4A schematically shows a signal control diagram for a first display mode and a second display mode according to one embodiment of the present disclosure; FigureFigure 4B schematically shows a signal timing diagram of a display control device according to another embodiment of the present disclosure; Figure 4C schematically shows a signal timing diagram of a display control device according to another embodiment of the present disclosure; Figure 4D schematically shows a signal timing diagram of a display control device according to another embodiment of the present disclosure; Figure 4E schematically shows a signal timing diagram of a display control device according to another embodiment of the present disclosure; Figure 4F schematically shows a signal timing diagram of a display control device according to another embodiment of the present disclosure; Figure 5A schematically shows a signal timing diagram of a display control device according to another embodiment of the present disclosure; FigureFigure 5B schematically shows a signal timing diagram of a display control device according to another embodiment of the present disclosure; Figure 5C schematically shows a signal timing diagram of a display control device according to another embodiment of the present disclosure; Figure 5D schematically shows a signal timing diagram of a display control device according to another embodiment of the present disclosure; Figure 5E schematically shows a signal timing diagram of a display control device according to another embodiment of the present disclosure; Figure 6 schematically shows a block diagram of a display device according to an embodiment of the present disclosure; and Figure 7 schematically shows a flowchart of a display control method of an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE REVELATION Embodiments of the present disclosure are described below with reference to the accompanying drawings. It should be understood, however, that these descriptions are only exemplary and are not intended to limit the scope of the present disclosure. To facilitate interpretation, many specific details are presented in the following detailed description, in order to allow a comprehensive understanding of the embodiments of the present disclosure. However, it is clear that one or more embodiments can also be realized without these specific details. Furthermore, descriptions of known structures and technologies are omitted in the following description in order to avoid unnecessarily obscuring the concepts of the present disclosure.It should be noted that the shape and size of the individual components in the illustrations do not reflect the actual size and ratio, but merely illustrate the content of the embodiments of the present disclosure. The terms used herein serve only to describe certain embodiments and are not intended to limit the present disclosure. The terms "comprising," "containing," etc., used herein indicate the presence of the feature, step, process, and / or component, but do not preclude the presence or addition of one or more other features, steps, processes, or components. All terms used herein (including technical and scientific terms) have the meanings generally understood by experts, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification and should not be interpreted in an idealized or overly rigid way. When the expression is used similarly to "at least one of A, B or C", it should be explained in accordance with the meaning of the expression as it is generally understood by those skilled in the art (e.g., "a system containing at least one of A, B or C" should include, but not be limited to, a system containing only A, a system containing only B, a system containing only C, a system containing A and B, a system containing A and C, a system containing B and C, and / or a system containing A, B and C). A display device can operate in a display mode that corresponds to a usage scenario. For example, if the usage scenario is a power-saving scenario, the display mode can be a power-saving mode. If the usage scenario is a normal usage scenario, the display mode can be a normal display mode. The display device in embodiments of the present disclosure can be a mobile phone, a smartwatch, a notebook, or any other device with a display field, which is not limited herein. Fig. 1A schematically shows a signal control diagram for a first display mode and a second display mode according to an example. Fig. 1B schematically shows a signal timing diagram for the switch from the first display mode to the second display mode according to the example. As shown in Fig. 1A, the first and second display modes can have different display frequencies. For example, the display frequency in the first display mode can be higher than in the second display mode. In the first display mode, a second control signal can be used to control a display field for the display in the first display mode, and a first control signal does not control the display field. In the second display mode, the first control signal can control the display field so that it displays in the second display mode, and the second control signal does not control the display field. As shown in Fig. 1B, during period P1, the display device is in the first display mode, in which the second control signal is at a high level and the first control signal is in a high-impedance state (i.e., Hiz). At time p1, the display device switches from the first display mode to the second display mode, with the first control signal being adjusted from a high-impedance state to a high level and the second control signal also being adjusted from a high level to a high-impedance state. During period P2, the display device is in the second display mode, in which the first control signal is at a high level and the second control signal is in a high-impedance state. The high level can be an active level, and the high-impedance state can be an inactive level.When the first control signal is set to the active level, it may be in an unstable state, causing the current flowing through the display device to also be unstable. Since the actual brightness value of the display device is positively correlated with its current, the actual brightness value can fluctuate and cause screen flicker if the first control signal is unstable. In light of this, the present disclosure proposes a display control device by which a display device can enter a display transition period when a display mode switching instruction is detected. The second control signal is in a stable state during the display transition period, and the first control signal transitions from an unstable state to a stable state during the display transition period. Extending the display transition period can help the first control signal transition to the stable state. During the display transition period, the display device is controlled to display according to the second control signal, which is stable, and during the display transition period, the display device is controlled to display according to the first control signal, which is stable.In this way, it is possible to avoid a flickering phenomenon of the display device if the display device is directly controlled by the unstable first control signal so that it displays when the display mode switching instruction is detected, thereby improving a display effect of the display device. Fig. 2A schematically shows a block diagram of a device for display control according to an embodiment of the present disclosure. As shown in Fig. 2A, a device 200 for display control can comprise a first control circuit 210 and a display circuit 220. The first control circuit 210 can be configured to control a display device in response to a detected display mode switching instruction to switch from a first display mode to a second display mode, to allow a first control signal to be at an active level at a first predetermined time of the display transition period and a second control signal to be at an inactive level at a second predetermined time of the display transition period. The display circuit 220 can be configured to control the display device during a display period according to the first control signal, so that it displays in a second display mode when it is detected that the second control signal is at the inactive level. The second control signal is used to control the display device so that it displays in the first display mode. According to the embodiments of the present disclosure, the first display mode and the second display mode can have different display frequencies. For example, the display frequency of the first display mode can be 60 Hz, and the display frequency of the second display mode can be 30 Hz. If it is necessary to reduce the display frequency, it is accordingly possible to switch from the first display mode to the second display mode in order to display at a lower display frequency in the second display mode. The maximum actual brightness value in the first display mode can differ from that in the second display mode. For example, the maximum actual brightness value in the first display mode might be 650 nits, and the maximum actual brightness value in the second display mode might be 150 nits. If it is necessary to reduce the actual brightness value of the display device, it is possible to switch from the first display mode to the second display mode to display with a lower maximum actual brightness value in the second mode. The actual brightness value can be a brightness value of the actual luminance of the display device. The display mode switching instruction can be received via a processor interface (Mobile Industry Processor Interface (MIPI)) of the display device. The display transition period can be a period in which the initial control signal is brought into a stable state. This stable state can prevent flickering of the display device's screen when the display device is controlled according to the initial control signal. The first predetermined time of the display transition period can be a time before the second predetermined time of the display transition period. The first and second predetermined times of the display transition period can be any time between a start time and an end time of the display transition period. The first predetermined time of the display transition period can also be the start time of the display transition period, and the second predetermined time of the display transition period can also be the end time of the display transition period. At the first predetermined point in the display transition period, the first control signal can be set to an active level. At the second predetermined point in the display transition period, the second control signal can be set to an inactive level. During the display transition period, the first control signal may be in an unstable state, while the second control signal is in a stable state at an active level. Therefore, the second control signal, in its stable state during the display transition period, controls the display device to display the information. The display period can be one period after the display transition period. For example, the display period can follow the second predetermined time of the display transition period. The first control signal can be in a stable state at the second predetermined time of the display transition period. Therefore, during the display period, the display device can be controlled according to the first control signal in a stable state so that it displays in the second display mode, thus preventing flickering of the display device's screen. If the active level is high, the inactive level can be a high impedance state or a low level. If the active level is low, the inactive level can be a high impedance state or a high level. For example, the active level of the first control signal can be high, and the inactive level of the first control signal can be low or high impedance. The active level of the second control signal can be high, and the inactive level of the second control signal can be high impedance or low level. A temporal variation of the first control signal and the second control signal is described below with reference to Fig. 2B. Fig. 2B schematically shows a signal timing diagram of a device for display control according to an embodiment of the present disclosure. As shown in Fig. 2B, the first control signal is set to an active level at a first predetermined time t1 of the display transition period T1. At a second predetermined time t2 of the display transition period T1, the second control signal is set to an inactive level. During display period T2, the second control signal remains at the inactive level, and the display device is controlled according to the first control signal to display in the second display mode. When a display mode toggle instruction is detected, the display device can enter the display transition period. The second control signal is in a stable state during the display transition period, and the first control signal transitions from an unstable state to a stable state during the display transition period. Extending the display transition period can help the first control signal transition to the stable state. During the display transition period, the display device is controlled to display according to the second control signal, which is stable, and during the display transition period, the display device is controlled to display according to the first control signal, which is stable.In this way, it is possible to avoid a flickering phenomenon of the display device if the display device is directly controlled by the unstable first control signal so that it displays when the display mode switching instruction is detected, thereby improving a display effect of the display device. The first control circuit 210 can contain a time control sub-circuit and a brightness control sub-circuit. The timing control sub-circuit can allow the first control signal to be at an active level at the first predetermined time of the display transition period and the second control signal to be at an inactive level at the second predetermined time of the display transition period. The brightness control sub-circuit can determine a first display brightness value corresponding to the second display mode, according to a first actual brightness value corresponding to the second display mode, during the display transition period. The display circuit 220 can control the display device according to the first control signal so that it displays in the second display mode by configuring a display brightness value of the display device as the first display brightness value under the control of the first control signal, so that the display device displays with the first actual brightness value. For the time control sub-circuit, reference can be made to the first control circuit, which is not repeated here. The display brightness value (DV) allows the display device to be controlled so that, in the corresponding display mode, it shows the actual brightness level, which corresponds to the DV. The relationship between the DV and the actual brightness level can be determined through gamma tuning. The first display brightness value can be a value used to control the display device so that it displays in the second display mode with the first actual brightness value. To enable the display device to display with the first actual brightness value, it is possible to determine the first display brightness value corresponding to the first actual brightness value through gamma tuning and configure the display device's display brightness value as the first display brightness value, thus allowing the display device to display with the first actual brightness value. To determine the first display brightness value corresponding to the second display mode according to the first actual brightness value corresponding to the second display mode, the brightness control sub-circuit can further be used to determine, in response to a display brightness value toggling instruction, the first display brightness value corresponding to the second display mode from a first set of mapping relationships or a second set of mapping relationships according to the first actual brightness value corresponding to the second display mode. The brightness control sub-circuit can further be used to determine the first display brightness value corresponding to the second display mode from the first set of mapping relationships according to the first actual brightness value corresponding to the second display mode. The first set of mapping relationships includes at least one first mapping relationship. The first mapping relationship represents a relationship between the actual brightness value and the display brightness value when the display device is powered by an integrated power management IC (PMIC). The second set of mapping relationships includes at least one second mapping relationship. The second mapping relationship represents a relationship between the actual brightness value and the display brightness value when the display device is powered by an integrated display driver IC (DDIC). The display brightness value toggling instruction can be an instruction used to switch the second actual brightness value corresponding to the first display mode to the first actual brightness value corresponding to the second display mode. The second actual brightness value can be an actual brightness value that is adjusted for the second display mode. The first set of imaging relationships can be obtained by gamma tuning by powering the display device through the PMIC, and the second set of imaging relationships can be obtained by gamma tuning by powering the display device through the DDIC. When the display device is powered through the DDIC, the voltage is low, and the maximum actual brightness value at which the display device can show is lower than the maximum actual brightness value at which the display device can show when powered through the PMIC. For example, the maximum actual brightness value in the first set of imaging relationships might be 650 nits, and the maximum actual brightness value in the second set of imaging relationships might be 150 nits. A display brightness value in the first set of mapping relationships and the same display brightness value in the second set of mapping relationships can correspond to different actual brightness values. For example, in the first set of mapping relationships, a display brightness value of 255 can correspond to an actual brightness value of 650 nits, and in the second set of mapping relationships, a display brightness value of 255 can correspond to an actual brightness value of 150 nits. A display brightness value in the first set of mapping relationships and a different display brightness value in the second set of mapping relationships can correspond to the same actual brightness value. For example, in the first set of mapping relationships, a display brightness value of 59 can correspond to an actual brightness value of 150 nits, and in the second set of mapping relationships, a display brightness value of 255 can correspond to an actual brightness value of 150 nits. If the first actual brightness value differs from the second actual brightness value, the second actual brightness value, which corresponds to the first display mode, must be switched to the first actual brightness value, which corresponds to the second display mode, by the display brightness value toggling instruction. If the first actual brightness value is equal to the second actual brightness value, it can be determined whether the actual brightness value in the first display mode and the actual brightness value in the second display mode are determined by the same set of mapping relationships. If the actual brightness value in the first display mode and the actual brightness value in the second display mode are determined by different sets of mapping relationships, it is necessary to switch the second actual brightness value, corresponding to the first display mode, to the first actual brightness value, corresponding to the second display mode, using the display brightness value toggle instruction. If it is determined that the actual brightness value in the first display mode and the actual brightness value in the second display mode are determined by the same set of mapping relationships, i.e.,If the display brightness value corresponding to the first actual brightness value is the same as the display brightness value corresponding to the second actual brightness value, it is not necessary to toggle the display brightness value using a display brightness toggle instruction. A range of the actual brightness value in the first set of mapping relationships is larger than that in the second set of mapping relationships. Therefore, if it is found that the actual brightness value in the first display mode and the actual brightness value in the second display mode are determined by the same set of mapping relationships, then this set of mapping relationships is the first set of mapping relationships. It is possible to determine the set of mapping relationships adapted to the second display mode, to determine the mapping relationship adapted to the first actual brightness value from the set of mapping relationships adapted to the second display mode according to the first actual brightness value, and to determine the first display brightness value according to the mapping relationship. According to the embodiments of the present disclosure, the actual brightness value in the first display mode and the actual brightness value in the second display mode can be determined by different sets of mapping relationships. For example, if the first display mode is a normal mode and the second display mode is an always-on display (AOD) mode, the first control signal is provided by the DDIC, and the second control signal is provided by the PMIC. The actual brightness value in the first display mode can be determined according to the first set of mapping relationships, and the actual brightness value in the second display mode can be determined according to the second set of mapping relationships. If the first display mode is AOD mode and the second display mode is normal mode, the first control signal is provided by the PMIC, and the second control signal is provided by the DDIC. The actual brightness value in the first display mode can be determined according to the second set of mapping relationships, and the actual brightness value in the second display mode can be determined according to the first set of mapping relationships. Normal mode is the display mode of the device when it is in use, and AOD mode is the display mode of the device when it is not in use. In AOD mode, the device can only display basic information such as the time. The actual brightness value in the first display mode and the actual brightness value in the second display mode can be determined by the same set of mapping relationships. For example, if the first display mode is normal mode and the second display mode is AOD mode, the actual brightness value in normal mode and the actual brightness value in AOD mode can both be determined according to the first set of mapping relationships. However, some of the actual brightness values ​​in the first set of mapping relationships may not be available in AOD mode because the first control signal in AOD mode is a control signal provided by the DDIC, and the voltage of the control signal that the DDIC can provide is lower than the voltage of the control signal that the PMIC can provide. According to the embodiments of the present disclosure, the voltage conversion efficiency can be improved by using the control signal provided by the DDIC in AOD mode, since the voltage conversion efficiency of the DDIC is higher than that of the PMIC. The first tax circuit 210 can also contain a first tax register and a second tax register. The first control register can be configured to store the first set of mapping relationships. The second control register can be configured to store the second set of mapping relationships. By storing the first set of mapping relationships and the second set of mapping relationships in separate control registers, the display brightness value of the display device can be controlled by independent control registers in different display modes of the display device. Compared to the method of controlling the display device by a single control register, the method of controlling the display brightness value in different modes using two control registers is more flexible. The first set of mapping relationships and the second set of mapping relationships can also be stored in the same control register. For example, the first control register can be configured to store both the first and second set of mapping relationships. A display frequency corresponding to the second display mode is a first display frequency determined by a tear effect signal (TE). The tear effect signal can be a signal generated by the DDIC (Digital Display Integration Controller) used to prevent tearing during image refresh while displaying the image. The tear effect signal can have different frequencies in different display modes. The display frequency corresponding to one display mode can be the same as the frequency of the tear effect signal in that display mode, and vice versa. The tear effect signal can also be used as a reference signal to send instructions to an application processor. According to embodiments of the present disclosure, the display frequency in AOD mode can be lower than in normal mode, since the display device is in a non-use state in AOD mode, thus reducing the display's power consumption. For example, the display frequency can be 60 Hz in normal mode and 30 Hz in AOD mode. If, for instance, the first display mode is normal mode and the second display mode is AOD mode, the display frequency corresponding to the second display mode is the first display frequency, which is 30 Hz; and if the first display mode is AOD mode and the second display mode is normal mode, the display frequency corresponding to the second display mode is the first display frequency, which is 60 Hz. If the first display mode is the normal mode and the second display mode is the AOD mode, the device 200 for display control may also include a second control circuit. The second control circuit can be configured to generate a display mode switching instruction when the actual brightness value of the display device is the second actual brightness value corresponding to the first display mode. The second actual brightness value is an actual brightness value that is adjusted for the AOD mode. The display device may contain a sensor to detect ambient light. If the sensor detects that the ambient light is dim, the display device may reduce its actual brightness level. If this brightness level is the second highest actual brightness level corresponding to normal mode, the display device may generate a display mode toggle instruction to switch from normal mode to AOD mode. If the display device in normal mode receives no operating request within a predetermined time period, its actual brightness value can be reduced. The predetermined duration can be 10 seconds, 20 seconds, 30 seconds, etc. If the display device's actual brightness value is the second highest brightness value corresponding to normal mode, a display mode switching instruction can be generated. The display device can also generate a display mode switching instruction if the actual brightness value of the display device is set to the second actual brightness value that corresponds to normal mode after a user has received a switching request to switch from normal mode to AOD mode. If the actual brightness value of the display device is the second actual brightness value corresponding to the first display mode, the second actual brightness value is an actual brightness value adapted to the AOD mode, i.e., it is possible to switch from the first display mode to the AOD mode while the actual brightness value remains unchanged, thus avoiding screen flicker of the display device. The second actual brightness value can be used to determine whether the first display mode meets a condition for switching to the second display mode. If it is determined that the actual brightness value of the display device is the second actual brightness value corresponding to the first display mode, then it can be determined that the actual brightness value of the display device meets the condition for switching to the second display mode, and a display mode switching instruction can be generated. If the first display mode is the normal mode and the second display mode is the AOD mode, the second control circuit can further be configured to, under the control of a third control signal, adjust the display brightness value of the display device from a third display brightness value corresponding to the first display mode to a second display brightness value corresponding to the first display mode, according to the first set of mapping relationships, so that the actual brightness value of the display device is adjusted from a third actual brightness value corresponding to the first display mode to a second actual brightness value corresponding to the first display mode. The third control signal is provided by the PMIC. The third display brightness value corresponds to the third actual brightness value, and the second display brightness value corresponds to the second actual brightness value. The third actual brightness value can be the actual brightness value of the display device in the first display mode, before the display mode switching instruction is received from the display device. The third actual brightness value can be higher than the second actual brightness value. The third actual brightness value may be an actual brightness value that does not correspond to the AOD mode. For example, the third actual brightness value may be higher than any actual brightness value in AOD mode. Since the first and second actual brightness values ​​both correspond to the second display mode, while the third actual brightness value does not correspond to the actual brightness value in AOD mode, the display may fail to switch from normal mode to AOD mode when the display has the third actual brightness value. It may then be necessary to adjust the display's actual brightness value from the third actual brightness value, corresponding to the first display mode, to the second actual brightness value, corresponding to the first display mode. If the first display mode is the normal mode and the second display mode is the AOD mode, the third control signal can be the same signal as the first control signal. If the first display mode is the normal mode and the second display mode is the AOD mode, it is possible, under the control of a third control signal, to determine a first mapping relationship that corresponds to the second actual brightness value from the first set of mapping relationships according to the second actual brightness value, and to determine the second display brightness value that corresponds to the second actual brightness value according to the first mapping relationship, so that the display device is set from the third display brightness value corresponding to the first display mode to the second display brightness value corresponding to the first display mode. To adjust the display brightness value of the display device from the third display brightness value corresponding to the first display mode to the second display brightness value corresponding to the first display mode, according to the first set of mapping relationships, so that the actual brightness value of the display device is adjusted from the third actual brightness value corresponding to the first display mode to the second actual brightness value corresponding to the first display mode, the second control circuit can further be configured to gradually adjust the display brightness value of the display device from the third display brightness value corresponding to the first display mode to the second display brightness value corresponding to the first display mode, according to the first set of mapping relationships, so that the actual brightness value of the display device gradually decreases from the third actual brightness value.which corresponds to the first display mode, is set to the second actual brightness value, which corresponds to the first display mode. It is possible to determine at least one intermediate display brightness value according to the third display brightness value and the second display brightness value, and to adjust the display device from the third display brightness value to the at least one intermediate display brightness value and then from the at least one intermediate display brightness value to the second display brightness value according to the third display brightness value, the second display brightness value and the at least one intermediate display brightness value. For example, it is possible to determine a display brightness value interval according to the first display brightness value and the second display brightness value, to divide the display brightness value interval evenly into 10 parts, 20 parts, etc., to determine at least one intermediate display brightness value corresponding to the first display mode according to the display brightness values ​​at the endpoints of the evenly divided display brightness value sub-intervals, to set the display device from the third display brightness value to a first of the intermediate display brightness values ​​and then to a second of the intermediate display brightness values ​​in descending order, and so on, until from a last of the intermediate display brightness values ​​to the second display brightness value corresponding to the first display mode.For example, the third display brightness value, corresponding to the first display mode, could be 200, and the second display brightness value, corresponding to the first display mode, could be 100. Then, a display brightness value range of 100-200 can be defined, which can be divided into 10 equal parts, and 110, 120, 130, 140... 180, 190 can be set as intermediate display brightness values. The display device can be adjusted from the third display brightness value of 200, corresponding to the first display mode, to the intermediate display brightness value of 190, then from the intermediate display brightness value of 190 to the intermediate display brightness value of 180, and so on, down to the second display brightness value of 100, corresponding to the first display mode. By gradually adjusting the display brightness value of the display device from the third display brightness value, corresponding to the first display mode, to the second display brightness value, corresponding to the first display mode, the brightness of the display device is slowly reduced when the display device is adjusted from the third actual brightness value to the second actual brightness value, thus avoiding flickering of the display device in a case where the display device is adjusted directly from the third actual brightness value to the second actual brightness value, and improving the display effect of the display device. Fig. 3A schematically shows a signal timing diagram of the switching from the first display mode to the second display mode according to an embodiment of the present disclosure. As shown in Fig. 3 A, the display transition period T1 can be a first display transition sub-period. To ensure that the first control signal can be at the active level at the first predetermined time of the display transition period and the second control signal can be at the inactive level at the second predetermined time of the display transition period, the timing control sub-circuit can further be configured to allow the first control signal to be at the active level at the first predetermined time of the first display transition sub-period according to a first vertical synchronization pulse vsync_1, and to allow the second control signal to be at the inactive level at the second predetermined time of the first display transition sub-period according to a second vertical synchronization pulse vsync_2.The first predetermined time of the first display transition sub-period can be a first predetermined time t1 of the display transition period T1, and the second predetermined time of the first display transition sub-period can be a second predetermined time t2 of the display transition period T1. The first vertical synchronization pulse, vsync_1, is the first pulse of a first vertical synchronization signal (VSYNC) in the first display transition subperiod, and the second vertical synchronization pulse, vsync_2, is a pulse separated from the first vertical synchronization pulse, vsync_1, by one cycle of a first display frequency in VSYNC. The first display frequency is a display frequency corresponding to the second display mode. For example, the first display frequency could be 60 Hz. The frequency of the first vertical synchronization signal is the same as that of the first teardrop signal corresponding to the second display mode, and the first teardrop signal leads the first vertical synchronization signal by M frames, where M is greater than or equal to one-eighth and less than or equal to one-half. A frequency corresponding to each frame is the second display frequency corresponding to the first display mode. Fig. 3B schematically shows a signal timing diagram of a device for display control according to another embodiment of the present disclosure. As shown in Fig. 3B, the first control signal is DDIC ELVDD and the second control signal is PMIC ELVDD when the first display mode is normal mode and the second display mode is AOD mode. TE is ahead of VSYNC by M frames. The actual brightness value in the first display mode is determined by the first set of mapping relationships stored in the first control register, and the actual brightness value in the second display mode is determined by the second set of mapping relationships stored in the second control register. In Fig. 3B, a display mode switching instruction DMI_1 to switch from normal mode to AOD mode and a display brightness level switching instruction DBI_1 are received via the MIPI of the display device. The display mode switching instruction DMI_1 can be, for example, 0x39, and the display brightness level switching instruction DBI_1 can be, for example, 69h. At the first predetermined time of the first display transition sub-period, which can be a first predetermined time t1 of a display transition period T1 shown in Fig. 3B, the first vertical synchronization pulse vsync_1 is detected, and the display mode switching instruction DMI_1 is triggered to set the second control signal from the inactive level to the active level. During the first display transition sub-period, which can be a first predetermined time t1 of a display transition period T1 shown in Fig. 3B, the display mode switching instruction DMI_1 is triggered.3B, where the display transition period T1 shown, is used, a rising edge of the TE is detected, and the TE is set from the second display frequency to the first display frequency, for example, from 60 Hz to 30 Hz. At the second predetermined time of the first display transition sub-period, which is a second predetermined time t2 of the one shown in Fig.3B, where the display transition period T1 shown, is detected, the second vertical synchronization pulse vsync_2 is detected, the display brightness value toggling instruction DBI_1 is triggered to set the second control signal to the inactive level, an ESTV (Emission Start Vertical) signal is set from one pulse per frame in the first display mode to four pulses per frame in the second display mode, a source is set from the second display brightness value, which corresponds to the second actual brightness value in the first display mode, to the first display brightness value, which corresponds to the first actual brightness value in the first display mode, and a control signal (i.e., Swire), which is used to control the second control signal, is set from an active level to an inactive level. Fig. 3C schematically shows a signal timing diagram of a device for display control according to another embodiment of the present disclosure. As shown in Fig. 3C, unlike Fig. 3B, the first display mode is the AOD mode, the second display mode is the normal mode, the first control signal is PMIC ELVDD, and the second control signal is DDIC ELVDD. The actual brightness value in the first display mode is determined by the second set of mapping relationships stored in the second control register, and the actual brightness value in the second display mode is determined by the first set of mapping relationships stored in the first control register. In Fig. 3C, a display mode switching instruction DMI_2 to switch from AOD mode to normal mode and a display brightness level switching instruction DBI_2 are received via the MIPI of the display device. The display mode switching instruction DMI_2 can be, for example, 0x38, and the display brightness level switching instruction DBI_2 can be, for example, 51h. At the first predetermined time of the first display transition sub-period, which can be a first predetermined time t1 of a display transition period T1 shown in Fig. 3C, the first vertical synchronization pulse vsync_1 is detected, and the DMI_2 is triggered to set the second control signal from the inactive level to the active level. During the first display transition sub-period, which may be a display transition period T1 shown in Fig. 3C, the rising edge of the TE is detected, and the TE is switched from the second display frequency to the first display frequency.At the second predetermined time of the first display transition sub-period, which may be a second predetermined time t2 of the display transition period T1 shown in Fig. 3C, the second vertical synchronization pulse vsync_2 is detected, and the DBI_2 is triggered to set the first control signal from the active level to the inactive level, to switch the ESTV from four pulses per frame in the first display mode to one pulse per frame in the second display mode, to set the second display brightness value, which corresponds to the second actual brightness value in the first display mode, to the first display brightness value, which corresponds to the first actual brightness value in the first display mode, and to set the Swire from the active level to the inactive level. The sets of mapping relationships corresponding to the normal mode and the AOD mode in Fig. 3B and Fig. 3C are each stored in two control registers. Therefore, the brightness value switching instruction DBI_1 for switching from normal mode to AOD mode and the brightness value switching instruction DBI_2 for switching from AOD mode to normal mode correspond to different control registers. Fig. 3D schematically shows a signal timing diagram of a device for display control according to another embodiment of the present disclosure. As shown in Fig. 3D, in contrast to Fig. 3B, the actual brightness value in the first display mode and the actual brightness value in the second display mode are both determined by the first set of mapping relations. Since the actual brightness value in the first display mode and the actual brightness value in the second display mode are both determined by the first set of mapping relationships, in a case where the second actual brightness value corresponding to the first display mode is identical to the first actual brightness value corresponding to the second display mode, the display brightness value switching instruction is unnecessary, and it is only required to receive the display mode switching instruction DMI_1 via the MIPI of the display device. For changes in other signals in Fig. 3D, reference can be made to Fig. 3B, which is not repeated here. Fig. 3E schematically shows a signal timing diagram of a device for display control according to another embodiment of the present disclosure. As shown in Fig. 3E in contrast to Fig. 3C, the actual brightness value in the first display mode and the actual brightness value in the second display mode are both determined by the first set of mapping relations. Since the actual brightness value in the first display mode and the actual brightness value in the second display mode are both determined by the first set of mapping relationships, in a case where the second actual brightness value corresponding to the first display mode is identical to the first actual brightness value corresponding to the second display mode, the display brightness value switching instruction is unnecessary, and it is only required to receive the display mode switching instruction DMI_2 via the MIPI of the display device. For changes in other signals in Fig. 3E, reference can be made to Fig. 3C, which will not be repeated here. In Fig. 3D and Fig. 3E, the display brightness value switching instruction is not required, and the execution of the display brightness value switching instruction is omitted, thus improving the efficiency of switching the display mode. For ease of understanding, Figures 3A to 3E show the start time of the display transition period as the first predetermined time t1 of the display transition period T1, and the end time of the display transition period as the second predetermined time t2 of the display transition period T1. However, the present disclosure is not limited to this. The start time of the display transition period can also be a time before the first predetermined time t1 of the display transition period T1, and the end time of the display transition period can also be a time after the second predetermined time t2 of the display transition period T1. Fig. 4A schematically shows a schematic representation of the signal control for a first display mode and a second display mode according to an embodiment of the present disclosure. As shown in Fig. 4A, the display control device may further include an application processor control circuit that connects a control pin for controlling the first control signal and a control pin for controlling the second control signal. When switching from the first display mode to the second display mode, the application processor control circuit may provide a first auxiliary control signal (e.g., Application Swire, AP Swire), and the AP Swire controls the second control signal to maintain the active level during the display transition period. Fig. 4B schematically shows a signal timing diagram of a device for display control according to another embodiment of the present disclosure. As shown in Fig. 4B, the display transition period T1 can include a first display transition sub-period T1_1 and a second display transition sub-period T1_2 preceding the first display transition sub-period T1_1. The application processor control circuit can be configured such that the first auxiliary control signal is at an active level at a third predetermined time point of the second display transition sub-period T1_2, and the first auxiliary control signal is at an inactive level at the second predetermined time point of the first display transition sub-period. The first auxiliary control signal can be used to control the second control signal in order to maintain the active level during the display transition period T1. The third predetermined time of the second display transition sub-period T1_2 can be a third predetermined time t3 of the display transition period T1, which can be a time before the first predetermined time of the display transition period. Specific operations of the timing control sub-circuit, which are performed to allow the first control signal to be at the active level at the first predetermined time of the display transition period and the second control signal to be at the inactive level at the second predetermined time of the display transition period, are described below with reference to Figs. 4C to 4F. At the first predetermined time of the first display transition sub-period, the first control signal may be at the active level according to a third vertical synchronization pulse vsync_3. At the second predetermined time of the first display transition sub-period, the first auxiliary control signal may be at the inactive level, so that the second control signal is also at the inactive level. The third vertical synchronization pulse vsync_3 is a first pulse of a second vertical synchronization signal in the first display transition sub-period. Fig. 4C schematically shows a signal timing diagram of a device for display control according to another embodiment of the present disclosure. As shown in Fig. 4C, the first control signal is DDIC ELVDD and the second control signal is PMIC ELVDD when the first display mode is normal mode and the second display mode is AOD mode. The actual brightness value in the first display mode is determined by the first set of mapping relationships, and the actual brightness value in the second display mode is determined by the second set of mapping relationships. The first and second sets of mapping relationships can be stored in the same register, for example, the first control register. The PMIC that controls the second control signal is controlled by DDIC Swire. In Fig. 4C, at the third predetermined time of the second display transition sub-period T1_2, which can be a third predetermined time t3 of a display transition period T1 in Fig. 4C, a display mode switching instruction DMI_1 and a display brightness level switching instruction DBI_2 are received via the MIPI of the display device, and the first auxiliary control signal is set from an inactive state to an active state. At the first predetermined time of the first display transition sub-period T1_1, which can be a first predetermined time t1 of the display transition period T1 in Fig. 4C, a third vertical synchronization pulse vsync_3 is detected, the display mode switching instruction DMI_1 is triggered to set the second control signal from the inactive level to the active level, and the DDIC Swire is set from the active level to the inactive level.The second control signal is controlled by the first auxiliary control signal. The ESTV is adjusted from one pulse per frame in the first display mode to four pulses per frame in the second display mode. The source is adjusted from the second display brightness value, corresponding to the second actual brightness value in the first display mode, to the first display brightness value, corresponding to the first actual brightness value in the first display mode. At the second predetermined time of the first display transition sub-period T1_1, which may be a second predetermined time t2 of the display transition period T1 shown in Fig. 4C, the first auxiliary control signal is adjusted from the active level to the inactive level in response to a detection that the active level of the first auxiliary control signal has been maintained for one frame. This allows the second control signal to be adjusted from the active level to the inactive level.The first display frequency corresponding to each frame is the second display mode. Fig. 4D schematically shows a signal timing diagram of a device for display control according to another embodiment of the present disclosure. As shown in Fig. 4D, unlike Fig. 4C, the first display mode is the AOD mode, the second display mode is the normal mode, the first control signal is the PMIC ELVDD, and the second control signal is the DDIC ELVDD. The actual brightness value in the first display mode is determined by the second set of mapping relationships, and the actual brightness value in the second display mode is determined by the first set of mapping relationships. The PMIC that controls the first control signal is primarily controlled by the DDIC Swire. In Fig. 4D, at the third predetermined time of the second display transition sub-period T1_2, which can be the third predetermined time t3 of the display transition period T1 in Fig. 4D, a display mode switching instruction DMI_2 and a display brightness value switching instruction DBI2 are received from the MIPI of the display device, and the first auxiliary control signal is set from the inactive state to the active state, so that the first control signal is set from the inactive level to the active level. At the first predetermined time of the first display transition sub-period T1_1, which can be a first predetermined time t1 of a display transition period T1 in Fig.If 4D is possible, a third vertical synchronization pulse vsync_3 is detected, the display mode switching instruction DMI_2 is triggered to set the second control signal from the active level to the inactive level, the DDIC Swire is set from the inactive level to the active level, the ESTV is set from one pulse per frame in the first display mode to four pulses per frame in the second display mode, and the source is set from the second display brightness value, corresponding to the second actual brightness value in the first display mode, to the first display brightness value, corresponding to the first actual brightness value in the first display mode. At the second predetermined time of the first display transition sub-period T1_1, which is a second predetermined time t2 of the one shown in Fig.In the 4D display transition period T1, the first auxiliary control signal is set from the active level to an inactive level in response to a detection that the active level of the first auxiliary control signal has been maintained for a frame, and the first control signal is controlled by the DDIC Swire. A frequency corresponding to each frame is the second display frequency, which corresponds to the first display mode. Fig. 4E schematically shows a signal timing diagram of a device for display control according to another embodiment of the present disclosure. As shown in Fig. 4E, in contrast to Fig. 4C, the actual brightness value in the first display mode and the actual brightness value in the second display mode are both determined by the first set of mapping relationships. Since the actual brightness value in the first display mode and the actual brightness value in the second display mode are both determined by the first set of mapping relationships, in a case where the second actual brightness value corresponding to the first display mode is identical to the first actual brightness value corresponding to the second display mode, the display brightness value switching instruction is unnecessary, and it is only required to receive the display mode switching instruction DMI_1 via the MIPI of the display device. For changes in other signals in Fig. 4E, reference can be made to Fig. 4C, which is not repeated here. Fig. 4F schematically shows a signal timing diagram of a device for display control according to another embodiment of the present disclosure. As shown in Fig. 4F, in contrast to Fig. 4D, the actual brightness value in the first display mode and the actual brightness value in the second display mode are both determined by the first set of mapping relationships. Since the actual brightness value in the first display mode and the actual brightness value in the second display mode are both determined by the first set of mapping relationships, in a case where the second actual brightness value corresponding to the first display mode is identical to the first actual brightness value corresponding to the second display mode, the display brightness value switching instruction is unnecessary, and it is only required to receive the display mode switching instruction DMI_2 via the MIPI of the display device. For changes in other signals in Fig. 4F, reference can be made to Fig. 4D, which will not be repeated here. In Fig. 4E and Fig. 4F, the display brightness value switching instruction is not required, and the execution of the display brightness value switching instruction is omitted, thus improving the efficiency of switching the display mode. For better understanding, in Figures 4B to 4F, the start time of the display transition period is the third predetermined time t3 of the display transition period T1, the end time of the display transition period is the second predetermined time t2 of the display transition period T1, and the first predetermined time of the first display transition period is the first predetermined time of the display transition period. However, the present disclosure is not limited to this. The start time of the display transition period can also be a time before the third predetermined time t3 of the display transition period T1, and the end time of the display transition period can also be a time after the second predetermined time t2 of the display transition period T1. Fig. 5A schematically shows a signal timing diagram of a device for display control according to another embodiment of the present disclosure. As shown in Fig. 5A, the display transition period T1 can include a first display transition sub-period. A first predetermined time of the first display transition sub-period can be a first predetermined time t1 of the display transition period T1, and a second predetermined time of the first display transition sub-period can be a second predetermined time t3 of the display transition period T1. At the first predetermined time of the first display transition sub-period, the first control signal can be at an active level according to a fourth vertical synchronization pulse vsync_4. At the second predetermined time of the first display transition sub-period, the second auxiliary control signal may be at an inactive level, so that the second control signal is at an inactive level. The fourth vertical synchronization pulse vsync_4 is a first pulse of a third vertical synchronization signal in the first display transition sub-period. The second auxiliary control signal is at the active level for a remaining time of the first display transition sub-period. Specific operations of the timing control sub-circuit, which are performed to allow the first control signal according to a fourth vertical synchronization pulse vsync_4 to be at the active level at the first predetermined time in the display transition sub-period, and to allow the second auxiliary control signal to be at an inactive level, so that the second control signal is at an inactive level at the second predetermined time of the display transition sub-period, are described below with reference to Figs. 5B to 5E. The timing control sub-circuit can further be configured to extend the active duration of the second auxiliary control signal by a predetermined duration from a time corresponding to the fourth vertical synchronization pulse vsync_4, according to the fourth vertical synchronization pulse vsync_4. The predetermined duration corresponds to a duration of P frames, where P is greater than or equal to one-eighth and less than or equal to one-half. A frequency corresponding to each frame is the second display frequency, which corresponds to the first display mode. Fig. 5B schematically shows a signal timing diagram of a device for display control according to another embodiment of the present disclosure. As shown in Fig. 5B, the first control signal is DDIC ELVDD and the second control signal is PMIC ELVDD when the first display mode is normal mode and the second display mode is AOD mode. The actual brightness value in the first display mode and the actual brightness value in the second display mode are both determined by the first set of mapping relationships. The second control signal is primarily controlled by the second auxiliary control signal (i.e., Swire). Since the actual brightness value in the first display mode and the actual brightness value in the second display mode are both determined by the first set of mapping relationships, in a case where the second actual brightness value corresponding to the first display mode is identical to the first actual brightness value corresponding to the second display mode, the display brightness value switching instruction may not be required, and it is only necessary to receive the display mode switching instruction DMI_1 via the MIPI of the display device. At the first predetermined time of the first display sub-period, which is a first predetermined time t1 of a display transition period T1 in Fig.If 5B is detected, a fourth vertical synchronization pulse vsync_4 is detected, the display mode switching instruction DMI_1 is triggered, the first control signal is set from the inactive level to the active level, the active duration of the second auxiliary control signal is extended by a predetermined duration of P frames from a time corresponding to the fourth vertical synchronization pulse vsync_4 by the control register, the ESTV is set from one pulse per frame in the first display mode to four pulses per frame in the second display mode, the source is set from the second display brightness value corresponding to the second actual brightness value in the first display mode to the first display brightness value corresponding to the first actual brightness value in the first display mode, and the Swire switches from an active level to an inactive level.At the second predetermined time of the first display transition sub-period, which can be a second predetermined time t2 of the display transition period T1 in Fig. 5B, the second auxiliary control signal, in response to a detection that the second auxiliary control signal has been extended by P frames from the first predetermined time t1, changes from the active level to an inactive level, so that the second control signal changes from the active level to an inactive level. A frequency corresponding to each frame is the first display frequency, which corresponds to the second display mode. The first display frequency can be, for example, 60 Hz. Fig. 5C schematically shows a signal timing diagram of a device for display control according to another embodiment of the present disclosure. As shown in Fig. 5C in contrast to Fig. 5B, the first display mode is the AOD mode, the second display mode is the normal mode, the first control signal is the PMIC ELVDD and the second control signal is the DDIC ELVDD. In Fig. 5C, a display mode switching instruction DMI_2 is received via the MIPI of the display device. At the first predetermined time of the first display sub-period, which corresponds to a first predetermined time t1 of a display transition period T1 in Fig.5C can be, a fourth vertical synchronization pulse vsync_4 is detected, a display mode switching instruction DMI_2 is triggered, the active duration of the second auxiliary control signal is extended by a predetermined duration of P frames from a time corresponding to the fourth vertical synchronization pulse vsync_4 by the control register, the ESTV is set from four pulses per frame in the first display mode to one pulse per frame in the second display mode, and the source is set from the second display brightness value corresponding to the second actual brightness value in the first display mode to the first display brightness value corresponding to the first actual brightness value in the first display mode. At the second predetermined time of the first display sub-period, which is a second predetermined time t2 of the display transition period T1 in Fig.In Fig. 5C, it is detected that the second auxiliary control signal is extended by P frames from the first predetermined time t1, and the second auxiliary control signal is set from the inactive level to the active level, so that the second control signal is set from the active level to the inactive level, with a frequency corresponding to each frame being the first display frequency, which corresponds to the first display mode. At the second predetermined time of the first display transition sub-period, which can be a second predetermined time t2 of the display transition period T1 in Fig. 5C, a pulse following the fourth vertical sync pulse vsync_4 of the VSYNC is detected, and the second control signal is set from the active level to the inactive level. In Fig. 5B and Fig. 5C, the display brightness value switching instruction is not required, and the execution of the display brightness value switching instruction is omitted, thus improving the efficiency of switching the display mode. Fig. 5D schematically shows a signal timing diagram of a device for display control according to another embodiment of the present disclosure. As shown in Fig. 5D, unlike Fig. 5B, the actual brightness value in the first display mode is determined by the first set of mapping relationships, and the actual brightness value in the second display mode is determined by the second set of mapping relationships. The first set of mapping relationships and the second set of mapping relationships can be stored in the same control register, e.g., the first control register. Since the actual brightness value in the first display mode and the actual brightness value in the second display mode are determined by different sets of mapping relationships, in a case where the second actual brightness value corresponding to the first display mode is identical to the first actual brightness value corresponding to the second display mode, the display brightness value toggling instruction is required to switch the second display brightness value corresponding to the second actual brightness value to the first display brightness value corresponding to the first actual brightness value. The display mode toggling instruction DMI_1 and the display brightness value toggling instruction DBI_2 can be received via MIPI from the display device. For changes in other signals in Fig. 5D, reference can be made to Fig. 5B, which is not repeated here. Fig. 5E schematically shows a signal timing diagram of a device for display control according to another embodiment of the present disclosure. As shown in Fig. 5E, unlike Fig. 5C, the actual brightness value in the first display mode is determined by the first set of mapping relationships, and the actual brightness value in the second display mode is determined by the second set of mapping relationships. The first set of mapping relationships and the second set of mapping relationships can be stored in the same control register, e.g., the first control register. Since the actual brightness value in the first display mode and the actual brightness value in the second display mode are determined by different sets of mapping relationships, in a case where the second actual brightness value corresponding to the first display mode is identical to the first actual brightness value corresponding to the second display mode, the display brightness value toggling instruction is required to switch the second display brightness value corresponding to the second actual brightness value to the first display brightness value corresponding to the first actual brightness value. The display mode toggling instruction DMI_2 and the display brightness value toggling instruction DBI_2 can be received via MIPI from the display device. For changes in other signals in Fig. 5E, reference can be made to Fig. 5C, which will not be repeated here. For clarity, in Figures 5A to 5E, the start time of the display transition period is the first predetermined time t1 of the display transition period T1, and the end time of the display transition period is the second predetermined time t2 of the display transition period T1. However, the present disclosure is not limited to this. The start time of the display transition period can also be a time before the first predetermined time t1 of the display transition period T1, and the end time of the display transition period can also be a time after the second predetermined time t2 of the display transition period T1. Fig. 6 schematically shows a block diagram of a display device according to an embodiment of the present disclosure. As shown in Fig. 6, a display device 600 can comprise a device 610 for display control according to the embodiments of the present disclosure and a display module 620. The display module 620 can be configured to display in a second display mode according to a first control signal provided by the device for display control. According to the embodiments of the present disclosure, the device 610 for display control can refer to the device 200 for display control in the aforementioned embodiments, which will not be repeated here. Fig. 7 schematically shows a flowchart of a method for display control of an embodiment of the present disclosure. As shown in Fig. 7, the display control method is applicable to the display control device according to the embodiments of the present disclosure, and the display control method comprises operation S710 and operation S720. In operation S710, a first control circuit, in response to a detected display mode switching instruction to switch from a first display mode to a second display mode, controls a display device to enter a display transition period, allows a first control signal to be at an active level at a first predetermined time of the display transition period, and allows a second control signal to be at an inactive level at a second predetermined time of the display transition period. The process S710 can, for example, refer to the first control circuit 210 in the aforementioned embodiments, which is not repeated here. In process S720, during a display period, in response to a detection that the second control signal is at an inactive level, the display circuit controls the display device according to the first control signal so that it displays in the second display mode. The second control signal is used to control the display device so that it displays in the first display mode. The process S720 can, for example, refer to the display circuit 220 in the aforementioned embodiments, which are not repeated here. The flowcharts and block diagrams in the accompanying drawings illustrate the possible architecture, functions, and operation of the system, method, and computer program product according to various embodiments of the present disclosure. In this context, each block in the flowcharts or block diagrams can represent a portion of a module, program segment, or code, wherein this portion contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions specified in the blocks may occur in a different order than shown in the accompanying drawings. For example, two blocks shown consecutively may in reality be executed essentially in parallel, or they may sometimes be executed in reverse order, depending on the functions involved.It should also be noted that each block in the block diagrams or flowcharts, and the combination of blocks in the block diagrams or flowcharts, can be implemented by a special hardware-based system that performs the specified functions or operations, or by a combination of special hardware and computer instructions. The person skilled in the art will understand that the various embodiments of the present disclosure and / or the features described in the claims can be combined and / or integrated in various ways, even if such combinations or integrations are not expressly described in the present disclosure. In particular, the various embodiments of the present disclosure and / or the features described in the claims can be combined and / or integrated in various ways without departing from the spirit and teachings of the present disclosure. All such combinations and / or integrations fall within the scope of the present disclosure. Embodiments of the present disclosure have been described above. However, these embodiments serve only for illustration and are not intended to limit the scope of the present disclosure. Although the various embodiments have been described separately above, this does not mean that the measures in the individual embodiments cannot be advantageously used in combination. The scope of the present disclosure is defined by the appended claims and their equivalents. The person skilled in the art may make various substitutions and modifications without departing from the scope of the present disclosure, and these substitutions and modifications should all fall within the scope of the present disclosure.

Claims

A display control device comprising: a first control circuit configured to control a display device to enter a display transition period in response to a detected display mode switching instruction to switch from a first display mode to a second display mode; to allow a first control signal to be at an active level at a first predetermined time during the display transition period; and to allow a second control signal to be at an inactive level at a second predetermined time during the display transition period; and a display circuit configured to control the display device in the second display mode in response to a detection during a display period, in accordance with the first control signal.where the second control signal is configured to control the display device so that it displays in the first display mode. Device according to claim 1, wherein the first control circuit comprises: a timing control sub-circuit configured to allow the first control signal to be at the active level at the first predetermined time of the display transition period, and to allow the second control signal to be at the inactive level at the second predetermined time of the display transition period; and a brightness control sub-circuit configured to determine a first display brightness value corresponding to the second display mode according to a first actual brightness value corresponding to the second display mode during the display transition period;and wherein the display circuit is configured to control the display device in accordance with the first control signal so that it displays in the second display mode by: configuring a display brightness value of the display device to the first display brightness value under the control of the first control signal, so that the display device displays with the first actual brightness value.; Device according to claim 2, wherein the brightness control sub-circuit is configured to determine the first display brightness value corresponding to the second display mode according to the first actual brightness value corresponding to the second display mode by one of the following: determining the first display brightness value corresponding to the second display mode from a first set of mapping relationships or a second set of mapping relationships according to the first actual brightness value corresponding to the second display mode in response to a detected display brightness value switching instruction; and determining the first display brightness value corresponding to the second display mode from the first set of mapping relationships according to the first actual brightness value corresponding to the second display mode;wherein the first set of mapping relationships includes at least one first mapping relationship, and the first mapping relationship represents a relationship between the actual brightness value and the display brightness value in a case where the display device is powered by an integrated power management circuit (PMIC); and wherein the second set of mapping relationships includes at least one second mapping relationship, and the second mapping relationship represents a relationship between the actual brightness value and the display brightness value in a case where the display device is powered by an integrated display driver circuit (DDIC). Device according to claim 3, wherein the first control circuit further comprises: a first control register configured to store the first set of mapping relationships; and a second control register configured to store the second set of mapping relationships. Device according to claim 1, wherein the second display mode corresponds to a first display frequency determined on the basis of a tear effect signal. Device according to any one of claims 2 to 5, wherein the display transition period comprises a first display transition sub-period; and wherein the timing control sub-circuit is configured to allow the first control signal to be at the active level at the first predetermined time of the display transition period, and to allow the second control signal to be at the inactive level at the second predetermined time of the display transition period, by: allowing the first control signal to be at the active level according to a first vertical synchronization pulse at the first predetermined time of the first display transition sub-period, and allowing the second control signal to be at the inactive level according to a second vertical synchronization pulse at the second predetermined time of the first display transition sub-period.wherein the first vertical synchronization pulse is a first pulse of a first vertical synchronization signal in the first display transition sub-period, the second vertical synchronization pulse is a pulse in the first vertical synchronization signal that is one cycle of a first display frequency removed from the first vertical synchronization pulse, and the first display frequency corresponds to the second display mode. Device according to claim 6, wherein the first vertical synchronization signal has the same frequency as a first teardrop effect signal corresponding to the second display mode, wherein the first teardrop effect signal precedes the first vertical synchronization signal by M frames, M being greater than or equal to one-eighth and less than or equal to one-half, and one frequency of each frame being a second display frequency corresponding to the first display mode. Device according to any one of claims 2 to 5, wherein the display transition period comprises a first display transition sub-period and a second display transition sub-period preceding the first display transition sub-period; and wherein the device further comprises: an application processor control circuit configured to allow a first auxiliary control signal to be at an active level at a third predetermined time of the second display transition sub-period, and to allow the first auxiliary control signal to be at an inactive level at a second predetermined time of the first display transition sub-period, wherein the first auxiliary control signal is configured to control the second control signal to maintain the active level during the display transition period. Device according to claim 8, wherein the timing control sub-circuit is configured to allow the first control signal to be at the active level at the first predetermined time of the display transition period, and to allow the second control signal to be at the inactive level at the second predetermined time of the display transition period, by: allowing the first control signal to be at the active level at the first predetermined time of the first display transition sub-period according to a third vertical synchronization pulse, and allowing the second control signal to be at the inactive level at the second predetermined time of the first display transition sub-period by having the first auxiliary control signal at the inactive level, wherein the third vertical synchronization pulse is a first pulse of a second vertical synchronization signal in the first display transition sub-period. Device according to any one of claims 2 to 5, wherein the display transition period comprises a first display transition sub-period; and wherein the timing control sub-circuit is configured to allow the first control signal to be at the active level at the first predetermined time of the display transition period, and to allow the second control signal to be at the inactive level at the second predetermined time of the display transition period, by: allowing the first control signal to be at the active level at the first predetermined time of the first display transition sub-period according to a fourth vertical synchronization pulse, and allowing the second control signal to be at the inactive level at the second predetermined time of the first display transition sub-period by setting the second auxiliary control signal to an inactive level.wherein the fourth vertical synchronization pulse is a first pulse of a third vertical synchronization signal in the first display transition sub-period, and wherein the second auxiliary control signal is at the active level for a remaining time of the first display transition sub-period. Device according to claim 10, wherein the timing control sub-circuit is further configured to extend an active duration of the second auxiliary control signal by a predetermined duration from a time corresponding to the fourth vertical synchronization pulse, in accordance with the fourth vertical synchronization pulse, wherein the predetermined duration corresponds to a duration of P frames, P being greater than or equal to one-eighth and less than or equal to one-half, and a frequency corresponding to each frame being a second display frequency corresponding to the first display mode. Device according to any one of claims 1 to 5, wherein the first control signal is provided by DDIC and the second control signal is provided by PMIC in a case where the first display mode is a normal mode and the second display mode is an Always-On-Display (AOD) mode; and wherein the first control signal is provided by PMIC and the second control signal by DDIC in a case where the first display mode is the AOD mode and the second display mode is the normal mode. Device according to claim 12, wherein in the case that the first display mode is the normal mode and the second display mode is the AOD mode, the device further comprises: a second control circuit configured to generate the display mode switching instruction in a case where an actual brightness value of the display device is a second actual brightness value corresponding to the first display mode, wherein the second actual brightness value is an actual brightness value matched to the second display mode. Device according to claim 12, wherein, in the case that the first display mode is the normal mode and the second display mode is the AOD mode, the second control circuit is further configured to adjust, under the control of a third control signal, a display brightness value of the display device from a third display brightness value corresponding to the first display mode to a second display brightness value corresponding to the first display mode, according to a first set of mapping relationships, such that the actual brightness value of the display device is adjusted from a third actual brightness value corresponding to the first display mode to a second actual brightness value corresponding to the first display mode, wherein the third control signal is provided by the PMIC, wherein the third display brightness value corresponds to the third actual brightness value.and the second display brightness value corresponds to the second actual brightness value. Device according to claim 14, wherein the second control circuit is configured to adjust the display brightness value of the display device from the third display brightness value corresponding to the first display mode to the second display brightness value corresponding to the first display mode, according to the first set of mapping relationships, such that the actual brightness value of the display device is adjusted from the third actual brightness value corresponding to the first display mode to the second actual brightness value corresponding to the first display mode by: stepwise adjusting the display brightness value of the display device from the third display brightness value corresponding to the first display mode to the second display brightness value corresponding to the first display mode, according to the first set of mapping relationships.so that the actual brightness value of the display device is gradually adjusted from the third actual brightness value, which corresponds to the first display mode, to the second actual brightness value, which corresponds to the first display mode. Display device comprising: the display control device according to any one of claims 1 to 15; and a display module configured to display in a second display mode according to a first control signal provided by the display control device. A method for display control applicable to the display control device according to any one of claims 1 to 15, the method comprising: controlling a display device in response to a detected display mode switching instruction to switch from a first display mode to a second display mode in order to enter a display transition period; allowing a first control signal to be at an active level at a first predetermined time during the display transition period; and allowing a second control signal to be at an inactive level at a second predetermined time during the display transition period, using a first control circuit; and controlling the display device to display in the second display mode according to the first control signal during a display period, in response to a detection that the second control signal is at the inactive level, using a display circuit.where the second control signal is configured to control the display device so that it displays in the first display mode.

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