CN108398996B - Power management method and electronic system - Google Patents

Abstract

The present disclosure relates to the technical field of power supply systems, and proposes a power management method. The instantaneous current reduction method includes: detecting the validity of a backlight black-insertion enable signal; if the backlight black-insertion enable signal is valid, turning off peripherals to Reduce the current; after a set period of time, turn on the peripheral. Using this method can reduce the current of the virtual reality device when the backlight is plugged into black.

Description

Power management method and electronic system

technical field

The present disclosure relates to the technical field of power systems, and in particular, to a power management method and an electronic system using the power management method.

Background technique

With the rapid development of smart devices and the improvement of related technologies, the requirements for devices with liquid crystal displays are getting higher and higher, such as green, energy-saving, high-efficiency, safety, etc. However, the higher the performance of the device or technology, the higher the power requirements. The demands also increased. The backlight black insertion technology of liquid crystal displays is a more commonly used technology. The backlight black insertion technology can make the picture with smear clearer. However, the backlight black insertion technology has high requirements on the backlight current.

At present, for virtual reality equipment, in the design of the whole machine, most of the liquid crystal displays used on the equipment belong to the same power supply system as the control circuit, and the instantaneous rise of current has a great influence on the power supply of other circuits. The current of the liquid crystal display in the virtual reality device when the backlight is plugged into black increases rapidly (3 times or more than the non-black time period) and the holding time is short (usually 1-2ms). When the power supply line is long (greater than 3m), the voltage drop of the power supply line will be large, which will cause the inlet voltage of the virtual reality device to sag, affecting the CPU and the whole machine. Other peripherals work normally. Therefore, during the design, the selection of the main board integrated circuit, the length of the power supply line and the power adapter are all limited, which reduces the system performance and reliability.

Therefore, it is necessary to study a power management method and an electronic system using the power management method.

It should be noted that the information disclosed in the above Background section is only for enhancement of understanding of the background of the present disclosure, and therefore may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.

SUMMARY OF THE INVENTION

The purpose of the present disclosure is to overcome the above-mentioned shortcoming of the rapid rise of current when the backlight is plugged into black in the prior art, and to provide a power management method with low current when the backlight is plugged into black, and an electronic system using the power management method.

According to one aspect of the present disclosure, there is provided a power management method for a system including a display device, a control unit, and peripherals, including:

Detecting the validity of the backlight black insertion enable signal of the display device;

If the backlight black insertion enable signal is valid, the control unit closes the currently controlled peripherals;

Turn off peripherals back on after a set period of time.

In an exemplary embodiment of the present disclosure, the peripheral device includes one or more of an indicator light, a communication device, an interface device, and a sensor.

In an exemplary embodiment of the present disclosure, the control unit controls the peripheral device in a polling manner.

In an exemplary embodiment of the present disclosure, a polling control period of the peripheral device by the control unit is determined according to a refresh frequency of the display device.

In an exemplary embodiment of the present disclosure, the operation time of the peripheral is a multiple of the polling control period.

In an exemplary embodiment of the present disclosure, the set time period is the duration of backlight black insertion.

In an exemplary embodiment of the present disclosure, the display device is a smart display unit.

According to an aspect of the present disclosure, an electronic system is provided, including a display device, a control unit, and peripherals, including: the control unit is configured to detect the validity of a backlight black insertion enable signal of the display device, and detect the When the backlight black insertion enable signal is valid, the currently controlled peripherals are turned off, and after a set period of time, the turned off peripherals are turned on again.

In an exemplary embodiment of the present disclosure, the control unit controls the peripherals in a polling manner.

In an exemplary embodiment of the present disclosure, the set time period is the duration of backlight black insertion.

In the power management method of the present disclosure, first, the validity of the backlight black insertion enable signal is detected; if the backlight black insertion enable signal is valid, the peripheral device is turned off to reduce the current; and the peripheral device is turned on after a set period of time. On the one hand, when the backlight is plugged into the black, the current is reduced by closing the peripherals, so that the power supply current of the whole machine is reduced, so that the requirements for the main board integrated circuit, the length of the power supply line and the power adapter are reduced during the design, and the reliability of the circuit is improved. performance and reliability of the entire device. On the other hand, the current is reduced to achieve the purpose of energy saving and emission reduction. On the other hand, the backlight insertion time is short, and the peripherals are turned on after a set period of time, which will not affect the work of the device.

It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description serve to explain the principles of the disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative efforts.

FIG. 1 schematically shows a flow chart of a power management method.

FIG. 2 schematically shows a program flow chart of a power management method.

FIG. 3 schematically shows an exploded view of a polling control cycle of an example implementation of a power management method.

FIG. 4 schematically shows a working current waveform diagram of the power management method.

Figure 5 schematically shows a block diagram of an electronic system.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments, however, can be embodied in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be employed. In other instances, well-known solutions have not been shown or described in detail to avoid obscuring aspects of the present disclosure.

Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repeated descriptions will be omitted. Some of the block diagrams shown in the figures are functional entities that do not necessarily necessarily correspond to physically or logically separate entities. These functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.

This example embodiment first provides a power management method, which can be used in a system including a display device, a control unit, peripheral devices, and the like. Referring to the flowchart of the power management method shown in FIG. 1 , the power management method may include the following steps:

Step S10, detecting the validity of the backlight black insertion enable signal of the display device.

Step S20, if the backlight black insertion enable signal is valid, the control unit turns off the currently controlled peripherals.

In step S30, after the set time period, the closed peripherals are turned on again.

According to the power management method in this example embodiment, on the one hand, when the backlight is plugged in black, the current is reduced by turning off peripherals, so that the power supply current of the whole machine is reduced, so that during design, the mainboard integrated circuit, the length of the power supply line and the The requirements of the power adapter are reduced, improving the reliability of the circuit and the reliability of the whole device. On the other hand, the current is reduced to achieve the purpose of energy saving and emission reduction. On the other hand, the backlight insertion time is short, and the peripherals are turned on after a set period of time, which will not affect the work of the device.

Next, the power management method in this example embodiment will be further described.

The display device is an intelligent display unit. In this exemplary embodiment, the display device is an augmented reality or virtual reality display device, and the control unit may be a CPU. Of course, the display device may also be an ordinary TV display screen, a computer display screen, and the like. According to different classification standards, the display device may also be a liquid crystal display device, a light emitting diode display device, an organic light emitting diode display device, and the like. The control unit may also be a device with control functions such as a microprocessor, an industrial computer, and the like. Peripherals may include one or more of indicator lights, communication devices, interface devices, sensors, and the like.

Referring to the program flow chart of the power management method shown in FIG. 2 .

During initialization, you can set the refresh rate of the virtual reality device and the duration of the backlight blackout. In this example implementation, the duration of the backlight black insertion may be 1.1 ms specifically, and the refresh frequency may be 90 Hz. Of course, those skilled in the art can understand that the refresh frequency can be set to 80 Hz, 100 Hz, etc. according to the requirements of the virtual reality device.

In step S10, the validity of the backlight black insertion enable signal of the display device is detected.

In this example embodiment, the detection of the validity of the backlight black insertion enable signal is to detect whether the backlight is turned on, the backlight black insertion enable signal is valid if the backlight is turned on, and the backlight black insertion enable signal is not turned on if the backlight is not turned on. invalid.

In step S20, if the backlight black insertion enable signal is valid, the control unit turns off the currently controlled peripherals to reduce the current.

In this example implementation, the number of peripheral devices to be turned off may be one, that is, only one peripheral device is turned off during the backlight black-insertion period in one polling control period, and the rest of the peripheral devices work normally. And the order in which peripherals are turned off can be preset. For convenience of description below, each peripheral may be referred to as a first peripheral, a second peripheral, a third peripheral, a fourth peripheral, and so on. The sequence of shutting down the peripherals can be set to shut down the first peripheral, shut down the second peripheral, shut down the third peripheral, shut down the fourth peripheral, and so on.

The control unit controls the peripherals in a polling manner. Polling is a way for the CPU to decide how to provide peripheral services, also known as "Programmed I/O". The concept of the polling method is that the CPU periodically sends out inquiries, and sequentially asks whether each peripheral device needs its service, and then provides the service, and then asks the next peripheral after the service is completed, and then repeats the cycle. The polling sequence of the control unit can be set as the first peripheral device, the second peripheral device, the third peripheral device, and the fourth peripheral device.

In this example embodiment, the polling control period of the control unit to the peripheral is determined according to the refresh frequency of the display device. Specifically, the polling control period of the CPU to the peripheral is determined according to the refresh frequency of the virtual reality device. Of course, the polling control period of the CPU for peripherals may be determined before the validity of the backlight black insertion enable signal is detected, or may be determined after the validity of the backlight black insertion enable signal is detected. For example, the refresh frequency of the virtual reality device is 90Hz, and the polling control period of the CPU to the peripheral is 1s/90≈11ms.

Before turning off the peripheral device to reduce the current, the instantaneous current reduction method may further include: the CPU inquires the peripheral device to determine the operation time of the peripheral device, so as to determine the operation time of the peripheral device in several consecutive rounds according to the multiple relationship between the operation time and the polling control period. The peripheral is turned off during the polling control cycle.

The multiple relationship between the operation time and the polling control period is determined as follows: the operation time is less than or equal to the polling control period, and it is determined that the operation time is twice the polling control period; the operation time is greater than one time the polling control period and less than or equal to the polling control period. It is equal to twice the polling control period, and the operation time is determined to be twice the polling control period; the operation time is greater than twice the polling control period and less than or equal to three times the polling control period, and the operation time is determined to be the polling control period. The determination methods of three times, four times, five times, etc. of the query control period are analogous, and will not be repeated here.

According to the multiple relationship between the operation time and the polling control period, it is determined to turn off the peripheral in several consecutive polling control periods, specifically: if the operation time of the peripheral is twice the polling control period, that is, the operation time is less than or equal to the In the polling control cycle, the peripheral is turned off during the polling control cycle. In the next polling control cycle, if the backlight black insertion enable signal is valid, the other peripheral is turned off to reduce the current; if the peripheral's The operation time is n times of the polling control period, where n is greater than 1, and n can be 2, 3, 4, etc., within n consecutive polling control periods, if the backlight black insertion enable signal is valid, it will be turned off The peripheral device is used to reduce the current; that is, the peripheral device is turned off in the polling control cycle, and the peripheral device is also turned off in the subsequent n-1 polling control cycles.

In step S30, after a set period of time, the turned-off peripherals are turned on again.

In the present exemplary embodiment, the set time period may be the duration of the backlight black insertion. Specifically, the duration of the backlight black insertion may be 1.1 ms. That is, in a polling control period of 11ms, 1.1ms of the duration of the backlight insertion black is non-working time, and the remaining 9.9ms is normal working time. After the peripheral is turned off for 1.1ms, the peripheral is turned on. Of course, in other exemplary embodiments of the present invention, the duration of the backlight black insertion may also be 0.9ms, 1.2ms, 1.3ms, etc., which is not particularly limited here.

Referring to the exploded view of the polling control cycle of an example implementation of the power management method shown in FIG. 3 . The black segment in the figure is the shutdown period of each peripheral, and the shaded end segment is the normal working period of each peripheral.

It has been determined that the operation time of the first peripheral is twice the polling control period, the operation time of the second peripheral is twice the polling control period, and the operation time of the third peripheral is twice the polling control period, The fourth peripheral operates for three times the polling control period.

Set the polling sequence of the four peripherals as follows: the first peripheral, the second peripheral, the third peripheral, and the fourth peripheral, and repeat the cycle according to the above sequence.

In the first polling control cycle, if it is detected that the backlight black insertion enable signal is valid, the first peripheral is turned off. After the backlight is inserted into black, the first peripheral is turned on. After the first polling control cycle ends, the first peripheral The operation of a peripheral also ends.

In the second polling control cycle, if it is detected that the backlight black insertion enable signal is valid, the second peripheral is turned off, and the second peripheral is turned on after the backlight is inserted into the black; in the third polling control cycle, the detection When the backlight black insertion enable signal is valid, since the operation of the second peripheral has not been completed, the second peripheral is still turned off. After the backlight black insertion is completed, the second peripheral is turned on. After the third polling control cycle ends, The operation of the second peripheral also ends.

In the fourth polling control cycle, if it is detected that the backlight black insertion enable signal is valid, the third peripheral is turned off. After the backlight is inserted into the black, the third peripheral is turned on. The operation of the three peripherals also ends.

In the fifth polling control cycle, if it is detected that the backlight black insertion enable signal is valid, the fourth peripheral is turned off, and the fourth peripheral is turned on after the backlight is inserted into the black; in the sixth polling control cycle, the detection When the backlight black insertion enable signal is valid, since the operation of the fourth peripheral has not been completed, the fourth peripheral is still turned off, and the fourth peripheral is turned on after the backlight black insertion is completed; in the seventh polling control cycle, It is detected that the backlight black insertion enable signal is valid. Since the operation time of the fourth peripheral is three times the polling control period, the operation of the fourth peripheral has not been completed at this time, so the fourth peripheral is still turned off, and the backlight is inserted black. After completion, the fourth peripheral is turned on; after the seventh polling control cycle ends, the operation of the fourth peripheral also ends.

And so on until all peripherals are turned off in turn, then a polling is completed. Therefore, the greater the number of peripherals, the longer the polling time is, and the polling duration is the product of the polling control period and the number of polling control periods. In this example implementation, the duration of one polling is 11ms*7=77ms.

Refer to the working current waveform diagram of the power management method shown in FIG. 4 . The backlight current suddenly increases when the backlight is plugged into black. Through timing control, a peripheral device is turned off when the backlight is plugged in black, so that the current of the CPU and peripherals drops significantly when the backlight is plugged in black. The backlight current is added to the CPU and peripheral currents to form the current of the whole machine. When the backlight is plugged into black, the cumulative value of the two currents drops significantly, which reduces the current of the whole machine and the instantaneous current also decreases.

In addition, in other example embodiments of the present invention, the number of peripheral devices to be turned off may be multiple. That is, two, three or more peripherals can be turned off during the black-insertion period of the backlight in one polling control cycle, and the remaining peripherals work normally. The more peripherals that are turned off, the more the current is reduced.

Additionally, although the various steps of the methods of the present disclosure are depicted in the figures in a particular order, this does not require or imply that the steps must be performed in the particular order or that all illustrated steps must be performed to achieve the desired result. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step for execution, and/or one step may be decomposed into multiple steps for execution, and the like.

Further, the present invention also provides an electronic system using the above power management method, referring to the block diagram of the electronic system shown in FIG. 5 . The electronic system includes a display device 5, a control unit 6, peripherals 7, etc. The control unit 6 is used to detect the validity of the backlight black insertion enable signal of the display device 5, and the control unit 6 detects the backlight insertion When the black enable signal is valid, the control unit 6 controls to turn off the currently controlled peripheral device, and after a set period of time, the control unit 6 controls to turn on the turned off peripheral device 7 again.

In this example embodiment, the control unit 6 controls the peripheral device 7 in a polling manner.

In this example embodiment, the set time period is the duration of the backlight black insertion.

The specific details of each part in the above electronic system have been described in detail in the corresponding power management method, so they are not repeated here.

It should be noted that although several modules or units of the apparatus for action performance are mentioned in the above detailed description, this division is not mandatory. Indeed, according to embodiments of the present disclosure, the features and functions of two or more modules or units described above may be embodied in one module or unit. Conversely, the features and functions of one module or unit described above may be further divided into multiple modules or units to be embodied.

From the description of the above embodiments, those skilled in the art can easily understand that the exemplary embodiments described herein may be implemented by software, or may be implemented by software combined with necessary hardware. Therefore, the technical solutions according to the embodiments of the present disclosure may be embodied in the form of software products, and the software products may be stored in a non-volatile storage medium (which may be CD-ROM, U disk, mobile hard disk, etc.) or on the network , including several instructions to cause a computing device (which may be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the method according to an embodiment of the present disclosure.

Other embodiments of the present disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or techniques in the technical field not disclosed by the present disclosure . The specification and examples are to be regarded as exemplary only, with the true scope and spirit of the disclosure being indicated by the appended claims.

Claims (7)

1. A power management method for a system including a display device, a control unit, and a peripheral device, comprising:

detecting the validity of a backlight black insertion enabling signal of the display device;

if the backlight black insertion enabling signal is effective, the control unit closes the currently controlled peripheral;

after a set time period, the closed peripheral equipment is turned on again;

the peripheral includes one or more of an indicator light, a communication device, an interface device, and a sensor;

the set time period is backlight black insertion duration;

and detecting the effectiveness of the backlight black insertion enabling signal, namely detecting whether the backlight is lightened, wherein if the backlight is lightened, the backlight black insertion enabling signal is effective, and if the backlight is not lightened, the backlight black insertion enabling signal is invalid.

2. The power management method of claim 1, wherein the control unit controls the peripheral device in a polling manner.

3. The power management method according to claim 2, wherein the polling control period of the peripheral device by the control unit is determined according to a refresh frequency of the display device.

4. The method of claim 3, wherein the operating time of the peripheral device is a multiple of the polling control period.

5. The power management method according to any one of claims 1 to 4, wherein the display device is an intelligent display unit.

6. An electronic system comprises a display device, a control unit and an external device, and is characterized in that the control unit is used for detecting the effectiveness of a backlight black insertion enabling signal of the display device, closing the currently controlled external device when the backlight black insertion enabling signal is detected to be effective, and re-opening the closed external device after a set time period;

the peripheral includes one or more of an indicator light, a communication device, an interface device, and a sensor;

the set time period is backlight black insertion duration;

and detecting the effectiveness of the backlight black insertion enabling signal, namely detecting whether the backlight is lightened, wherein if the backlight is lightened, the backlight black insertion enabling signal is effective, and if the backlight is not lightened, the backlight black insertion enabling signal is invalid.

7. The electronic system of claim 6, wherein the control unit controls the peripheral device in a polling manner.

Images