CN115686174A - Virtual image display system and power management method - Google Patents

Virtual image display system and power management method Download PDF

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Publication number
CN115686174A
CN115686174A CN202210430235.9A CN202210430235A CN115686174A CN 115686174 A CN115686174 A CN 115686174A CN 202210430235 A CN202210430235 A CN 202210430235A CN 115686174 A CN115686174 A CN 115686174A
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China
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battery
image display
virtual image
electronic device
handheld electronic
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CN202210430235.9A
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Chinese (zh)
Inventor
吴权礼
靳龙庭
林尚泽
林昱璋
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HTC Corp
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HTC Corp
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  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

The invention provides a virtual image display system and a power management method. The virtual image display system comprises a handheld electronic device with a first battery and a virtual image display with a second battery, wherein the handheld electronic device and the virtual image display are coupled with each other. The handheld electronic device is used for calculating the power supply time of the first battery; calculating an expected discharge time of the second battery under a discharge condition; comparing the available power time and the expected discharge time to generate a comparison result; and adjusting a supply current supplied from the first battery to the virtual image display according to the comparison result.

Description

Virtual image display system and power management method
Technical Field
The present invention relates to a virtual image display system and a power management method thereof, and more particularly, to a virtual image display system and a power management method thereof capable of extending a lifetime of the virtual image display system.
Background
With the rapid development of the fifth generation mobile communication technology (5G) and the high-performance computing capability of the 5G handheld electronic device, the virtual real-time interaction experience effect is achieved by transmitting power and data to the virtual image display through interfaces such as a Universal Serial Bus (USB), a USB OTG (on-the-go), and the like, and the application markets of mobile Virtual Reality (VR) and Augmented Reality (AR) are gradually drawing attention and discussed vigorously.
However, the battery of the current virtual image display is only set for providing the instant load change of the system to achieve the purpose of voltage stabilization, and the size and capacity specification of the battery is smaller than that of the handheld electronic device, taking the wearing comfort as the main requirement. In other words, the power supply of the virtual image display relies mainly on the battery supply of the handheld electronic device. Besides providing the power consumption of the handheld electronic device, the battery of the handheld electronic device also carries the power supply task of the virtual image display. Such a combination will cause the handheld electronic device to be discharged to the end, and be forced to enter a power-off state, and the battery in the original virtual image display still has the remaining capacity and is not fully utilized, so that the handheld electronic device cannot provide more service time for the user. It can be seen that power management between the handheld electronic device and the virtual image display will be another key to influence the user experience, and how to improve the overall usage time to achieve the best experience of the user is the object of the present invention.
Disclosure of Invention
The invention aims at a virtual image display system and a power supply management method, which can prolong the effective service time of the virtual image display system.
According to an embodiment of the present invention, a virtual image display system includes: the handheld electronic device comprises a first battery and a virtual image display device coupled with the handheld electronic device and provided with a second battery. The handheld electronic device is used for calculating the power supply time of the first battery; calculating an expected discharge time of the second battery under discharge conditions; comparing the available power time and the expected discharge time to generate a comparison result; and adjusting the supply current supplied by the first battery to the virtual image display according to the comparison result.
According to the embodiment of the invention, the power management method is applied between the handheld electronic device with the first battery and the virtual image display with the second battery, and comprises the steps of calculating the power supply available time of the first battery; calculating an expected discharge time of the second battery under a discharge condition; comparing the available power time and the expected discharge time to generate a comparison result; and adjusting a supply current supplied from the first battery to the virtual image display according to the comparison result.
According to the above description, the virtual image display system and the power management method of the invention calculate the power suppliable time of the first battery of the handheld electronic device and the expected discharge time of the second battery of the virtual image display, and compare the power suppliable time and the expected discharge time to further adjust the supply current supplied to the virtual image display by the handheld electronic device. The virtual image display system and the power management method of the invention improve the use efficiency of the battery in the handheld electronic device and the virtual image display by adjusting the supply current supplied by the handheld electronic device, so as to improve the overall use time of the virtual image display system.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a block diagram of a virtual image display system according to an embodiment of the invention;
FIG. 2 is a flowchart of a power management method according to an embodiment of the invention;
FIG. 3 is a flowchart of a power management method according to another embodiment of the invention;
FIGS. 4A and 4B are schematic diagrams illustrating states of charge of a first battery of a handheld electronic device and a second battery of a virtual display varying with time according to an embodiment of the present invention;
FIG. 5 is a block diagram of a virtual image display system according to an embodiment of the invention.
Description of the reference numerals
50：XX；
60：YY。
100. 500: a virtual image display system;
101. 501: a handheld electronic device;
102. 502: a virtual image display;
103. 503: a first battery;
104. 504, a step of: a second battery;
505: a first power manager;
506: a second power manager;
507: a first processor;
508: a second processor;
509: a first port;
510: a second port;
511: a display;
512: a speaker;
513: an application program;
d: data;
IBAT: a discharge current;
SC: supplying an electric current;
s201 to S204, S301 to S307: a step of;
s3011 to S3014: a substep;
T HEDro 、T VIDro 、T VIDro ': a point in time;
s and S': rate of change of state of charge;
slope: a slope;
t (0), T (n): a point in time;
SOC HED 、SOC HED (0)、SOC HED (n)、SOC VID (0)、SOC VID (n): the state of electric quantity;
V TH : a state of charge threshold.
Detailed Description
Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts.
Referring to fig. 1, fig. 1 is a block diagram of a virtual image display system according to an embodiment of the invention. The virtual image display system 100 includes a handheld electronic device 101 having a first battery 103 and a virtual image display 102 having a second battery 104, wherein the handheld electronic device 101 and the virtual image display 102 are coupled to each other. The handheld electronic device 101 is used for providing a supply current SC to the virtual image display 102.
In the virtual image display system 100, the handheld electronic device 101 can be any handheld computing device with basic input/output and operation functions, such as a smart phone or a tablet computer. The virtual image display 102 may be any wearable display device for Virtual Reality (VR) or Augmented Reality (AR), such as a head-mounted display device or virtual Reality glasses, etc. The first battery 103 and the second battery 104 may be any type of rechargeable battery, such as nickel cadmium batteries, nickel hydrogen batteries, lithium ion batteries, lithium polymer batteries, and the like.
In the virtual image display system 100, the first battery 103 is used for supplying power to the handheld electronic device 101 and can provide a supply current SC to the virtual image display 102. The second battery 104 may then be used to supply auxiliary power for the virtual image display 102. In the present embodiment, the total capacity of the first battery 103 may be greater than the total capacity of the second battery 104.
Referring to fig. 1 and fig. 2, fig. 2 is a flowchart illustrating a power management method according to an embodiment of the invention. In the power management method of the embodiment, in step S201, the handheld electronic device 101 may calculate the available time ted of the first battery 103. The handheld electronic device 101 can calculate the available time ted of the first battery 103 according to the present power of the first battery 103 and the power consumption status of the first battery 103.
In step S202, the handheld electronic device 101 can calculate an expected discharge time TVID of the second battery 104 of the virtual image display 102 under the discharge condition DR. Wherein the designer can set the discharge condition DR of the second battery 104 according to the specification of the second battery 104. In step S202, the handheld electronic device 101 calculates an expected discharge time TVID of the second battery 104 according to the discharge condition DR and the present amount of electricity of the second battery 104.
In step S203, the handheld electronic device 101 compares the available power time thred and the expected discharge time TVID to generate a comparison result RS.
If in step S203, the comparison result RS generated by the handheld electronic device 101 indicates the power-available time T HED Greater than or equal to the expected discharge time T VID At this time, it means that the first battery 103 has sufficient power to supply the operation of the virtual image display 102; on the contrary, if the comparison result RS generated in step S203 indicates the power suppliable time T HED Less than the expected discharge time T VID This indicates that the electric power of first battery 103 is insufficient.
Further, in step S204, the handheld electronic device 101 can adjust the supply current SC supplied by the handheld electronic device 101 to the virtual image display 102 through the power manager of the virtual image display 102 according to the comparison result RS generated in step S203.
In detail, in the embodiment of the present invention, if the comparison result RS shows the power supply available time T HED Greater than or equal to the expected discharge time T VID At this time, the virtual image display 102 can provide a part of the current for the virtual image display 102 to operate according to the power of the second battery 104, and the handheld electronic device 101 can perform the adjustment and reduction action of the supply current SC to prolong the usable time of the first battery 103. In addition, if the comparison result RS shows the power supply available time T HED Less than the expected discharge time T VID Meanwhile, the virtual image display system 100 may perform a corresponding power saving mechanism to prolong the service life of the virtual image display system 100.
Referring to fig. 1 and fig. 3, fig. 3 is a flowchart of a power management method according to an embodiment of the invention. In fig. 3, step S301 includes substeps S3011 to S3014. In sub-step S3011, the handheld electronic device 101 may detect a state of charge SOC of the first battery 103 HED And the rate of change of state of charge RC of the first battery 103. In thatIn an embodiment of the invention, the handheld electronic device 101 can detect the state of charge SOC of the first battery 103 in a time difference dT HED And calculating the state of charge SOC in the time difference dT HED To obtain a state of charge change dSOC HED . Hand-held electronic device 101 and state of charge dSOC HED Divided by the time difference dT to obtain the rate of change of state of charge RC. In sub-step S3012, the handheld electronic device 101 may determine the state of charge SOC of the first battery 103 HED Dividing the rate of change RC of the state of charge of the first battery 103 to calculate the time T of the first battery for supplying power HED (T HED ＝SOC HED /RC)。
In addition, in sub-step S3013, the handheld electronic device 101 detects the state of charge SOC of the second battery 104 VID . Next, in sub-step S3014, the handheld electronic device 101 determines the SOC according to the power state VID And discharge condition DR to calculate expected discharge time T of second battery 104 VID . The discharge condition DR includes a total capacity C in the specification of the second battery 104 VID (ii) a The designer defines the predetermined discharge current I of the second battery 104 according to the specification and usage requirement of the second battery 104 BAT . Also, in sub-step S3014, the handheld electronic device 101 may adjust the total capacitance C of the second battery VID And state of charge SOC of the second battery 104 VID Divided by a preset discharge current value I of the second battery 104 BAT To calculate the expected discharge time T of the second battery 104 VID (T VID ＝C VID ×SOC VID /I BAT )。
Next, in step S302, the handheld electronic device 101 can compare the power supply time T HED And expected discharge time T VID And judging the power supply available time T HED Whether it is greater than or equal to the expected discharge time T VID . If the power supply time T is available HED Greater than or equal to the expected discharge time T VID Then, the handheld electronic device 101 may execute step S303; on the contrary, if the handheld electronic device 101 determines that the available power time is less than the expected discharging time, step S305 is executed.
In the bookIn one embodiment, in step S303, the handheld electronic device 101 may limit the supply current SC provided by the first battery 103 to an upper current limit value I through the power manager in the virtual image display 102 limit Wherein the current upper limit value I limit Equal to the required current value I of the virtual image display 102 VID Minus a preset discharge current value I of the second battery 104 BAT (I limit＝ I VID -I BAT ). Wherein I VID Can be generated by the operating conditions of the virtual image display 102 and can be obtained by detection by a power manager in the virtual image display 102.
It is worth mentioning that the supply current SC provided by the first battery 103 of the handheld electronic device 101 to the virtual image display 102 may be limited (reduced) by having the second battery 104 provide part of the current. That is, the discharge rate of the first battery 103 can be reduced, and the service life thereof can be extended.
On the other hand, in step S305, the handheld electronic device 101 may start the power saving mechanism of the handheld electronic device 101, and reduce the hardware performance of a part of the handheld electronic device 101 to achieve the purpose of reducing the power consumption of the handheld electronic device 101 and prolonging the service life. The virtual image display system 100 can reduce the screen backlight brightness of the handheld electronic device 101; adjusting and reducing the antenna emission efficiency of the handheld electronic device 101; and/or adjusting the operating frequency of the handheld electronic device 101 to reduce the power consumption of the handheld electronic device 101. The power saving mechanism of the handheld electronic device 101 may be any power saving means provided by the manufacturer of the handheld electronic device 101, and is not particularly limited.
After the handheld electronic device 101 executes step S305, the state-of-charge rate S of the first battery 103 changes and decreases because the power-saving mechanism of the handheld electronic device 101 has been activated. At this time, the handheld electronic device 101 may re-execute step S301 to recalculate the power-available time T of the first battery 103 HED 。
Further, in step S304, the handheld electronic device 101 determines whether the second battery 104 of the virtual image display 102 is availableState of charge SOC VID Whether or not it is less than or equal to the state-of-charge threshold V TH To determine whether second battery 104 enters a low state of charge. Wherein the state of charge threshold V TH May be a designer defined lower state-of-charge limit for second battery 104. If the determination result in step S304 is yes, it represents that the second battery 104 is in a low state of charge. Is forced to discharge to I to avoid the second battery 104 in a low state of charge BAT To continuously provide part of the power of the virtual image display 102, which causes the operation of the virtual image display 102 and even the virtual image display system 100 to be unstable, the handheld electronic device 101 can execute steps S306 to S307. If the determination result in the step S304 is negative, the handheld electronic device 101 may re-execute the step S301 to calculate the power supply available time T HED And expected discharge time T VID To continuously manage the power of the virtual image display system 100.
In step S306, since the second battery 104 is already in the low power state, it is not desirable to let the second battery 140 of the virtual image display 102 discharge more current to avoid unstable operation of the virtual image display system 100. Therefore, in step S306, the handheld electronic device 110 can make the current value of the supply current SC to be the required current value I of the virtual image display 102 again through the virtual image display 102 VID (I limit＝ I VID )。
In step S307, the handheld electronic device 101 is used to start a power saving mechanism of the virtual image system 100, so as to reduce hardware performance of a part of the handheld electronic device 101 and the virtual image display 102 respectively to slow down power consumption, thereby achieving the purpose of prolonging the service life. In step S307, the virtual image system 100 may decrease the screen backlight brightness of the handheld electronic device 101; adjusting and reducing the antenna emission efficiency of the handheld electronic device 101; and/or adjust the operating frequency of the handheld electronic device 101 to reduce the power consumption of the handheld electronic device 101. In addition, in step S307, the virtual image system 100 may also down-regulate the charging current of the second battery 104 of the virtual image display 102; adjusting down the screen backlight brightness of the virtual image display 102; turning down the speaker volume of the virtual image display 102; the display frame rate of the virtual image display 102 is adjusted down and/or the operating frequency of the virtual image display 102 is adjusted down to reduce the power consumption of the virtual image display 102.
Referring now to fig. 1, 3 and 4A, 4B. Fig. 4A and 4B are schematic diagrams illustrating changes over time in states of power of a first battery of a handheld electronic device and a second battery of a virtual display in a virtual image display system according to an embodiment of the invention.
FIG. 4A shows a state of charge SOC of the first battery 103 of the handheld electronic device 101 according to the present embodiment HED Graph of the change with time T. The time point T (0) is a reference starting time of the handheld electronic device 101 executing the step 303, the time point T (n) is an nth minute time after the reference starting time, and n is any positive real number. Time point T HEDro Is the power drain time of the first battery 103 of the handheld electronic device 101. State of charge SOC HED (0)、SOC HED (n) is the state of charge SOC of the first battery 103 corresponding to time points T (0) and T (n), respectively HED 。
As shown in fig. 4A, the solid line slope (with slope S) after the time point T (0) is the state of charge SOC of the first battery 103 of the handheld electronic device 101 after the handheld electronic device 101 executes step S303 HED The variation curve of (c). If the handheld electronic device 101 does not execute the step 303, the state of charge SOC of the first battery 103 HED The variation curve can be represented by a dashed line (having a slope S') therein. As is apparent from the illustration in fig. 4A, in step 303 of the embodiment of the present invention, the discharge rate of the first battery 103 of the handheld electronic device 101 can be reduced, and the service life can be effectively prolonged.
FIG. 4B is a diagram illustrating the state of charge SOC of the second battery 104 of the virtual image display 102 according to the embodiment VID Graph of the time course. Wherein the time point T VIDro A power source exhaustion time of the second battery 104 of the virtual image display 102. And wherein the state of charge SOC VID (0)、SOC VID (n) is the state of charge SOC of the second battery 104 of the virtual image display 102 corresponding to the time points T (0), T (n) VID 。
As shown in the figure4B, the solid line slash and the dashed line slash after the time point T (0) indicate the state of charge SOC of the second battery 104 of the virtual image display 102 with a fixed discharge current IBAT VID The Slope of the solid line Slope and the dashed line Slope is-IBAT. In addition, the state of charge SOC of the second battery 104 at the time point T (n) VID (n) less than or equal to an electrical state threshold V TH Then the second battery 104 stops or slows down the discharge current and the state of charge SOC of the second battery 104 is made VID Slowly falls (as shown by chain line dashed line) so as to effectively improve the usable time of the second battery to the time point T VIDro ', where the absolute value of the Slope of the chain line dashed line is smaller than the absolute value of the Slope of the solid line sloped line and the dashed line sloped line.
Referring to fig. 5, fig. 5 is a block diagram of a virtual image display system according to an embodiment of the invention. The virtual image system 500 includes a handheld electronic device 501 and a virtual image display apparatus 502. The handheld electronic device 501 includes a first battery 503, a first power manager 505, a first processor 507, and a first port 509. The virtual image display device 502 includes a second battery 504, a second power manager 506, a second processor 508, a second port 510, a display 511, and a speaker 512.
The first Processor 507 and the second Processor 508 may be, for example, a Central Processing Unit (CPU), or other Programmable general purpose or special purpose Microprocessor (Microprocessor), digital Signal Processor (DSP), programmable controller, application Specific Integrated Circuit (ASIC), programmable Logic Device (PLD), or other similar devices or combinations thereof, which can load and execute computer programs.
The first power manager 505 is coupled to the first battery 503, the first port 509, and the first processor 507. The first processor 507 is coupled to the first port 509. The first port 509 is configured to be coupled to the second port 510 of the virtual image display apparatus 502.
The second power manager 506 is coupled to the second battery 504, the second processor 508, the second port 510, the display 511, and the speaker 512. The second processor 508 is coupled to the second port 510, the display 511 and the speaker 512.
The first processor 507 may be used to execute an application 513. The application 513 may perform the power management method of fig. 2 or fig. 4 of the present invention to perform the power management mechanism of the virtual image display system 500. Through the coupling mechanism between the first port 509 and the second port 510, the supply current SC can be provided from the handheld electronic device 501 to the virtual image display apparatus 502, and data D transceiving operation between the handheld electronic device 501 and the virtual image display apparatus 502 can also be performed. In one embodiment, the first port 509 and the second port 510 may be Universal Serial Bus (USB) ports, or any other ports capable of signal transmission known to one of ordinary skill in the art. The data D may also be transmitted or received through a wireless transmission.
In summary, the virtual image display system and the power management method of the invention calculate the power supply available time of the first battery of the handheld electronic device and the expected discharge time of the second battery of the virtual image display, and compare the power supply available time and the expected discharge time, so as to adjust the supply current supplied to the virtual image display by the handheld electronic device, and thereby improve the overall usage time of the virtual image display system.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.

Claims (14)

1. A virtual image display system comprising:
a handheld electronic device having a first battery; and
a virtual image display coupled to the handheld electronic device and having a second battery;
wherein the handheld electronic device is configured to:
calculating the power supply available time of the first battery;
calculating an expected discharge time of the second battery under discharge conditions;
comparing the available power time and the expected discharge time to generate a comparison result; and
and adjusting the supply current supplied to the virtual image display by the handheld electronic device according to the comparison result.
2. The virtual image display system of claim 1, wherein the handheld electronic device is configured to detect the state of charge of the first battery and the rate of change of the state of charge of the first battery, and to divide the state of charge of the first battery and the rate of change of the state of charge of the first battery by the calculated powered time.
3. The virtual image display system of claim 1, wherein the discharge condition comprises:
a total capacity of the second battery; and
a preset discharge current value of the second battery, wherein
The handheld electronic device is used for detecting the electric quantity state of the second battery and dividing the product of the total electric capacity of the second battery and the electric quantity state of the second battery by a preset discharge current value of the second battery to calculate the expected discharge time.
4. The virtual image display system of claim 1, wherein if the comparison result indicates that the power suppliable time is greater than or equal to the expected discharge time, the handheld electronic device is configured to subtract a preset discharge current value of the second battery from a required current value of the virtual image display to obtain an upper current limit value, and limit a current value of the supply current to the upper current limit value.
5. The virtual image display system of claim 1, wherein if the comparison result indicates that the power-available time is less than the expected discharge time, the handheld electronic device is configured to activate a power-saving mechanism of the handheld electronic device to reduce power consumption of the handheld electronic device, wherein the power-saving mechanism of the handheld electronic device comprises: adjusting and reducing the screen backlight brightness of the handheld electronic device; adjusting and reducing the antenna emission efficiency of the handheld electronic device; and adjusting and reducing at least one of the working frequencies of the handheld electronic device.
6. The virtual image display system of claim 4, wherein the handheld electronic device is configured to determine whether the state of charge of the second battery is less than or equal to a state of charge threshold if the comparison result indicates that the power-suppliable time is greater than or equal to the expected discharge time, and to make the supply current equal to a desired current value of the virtual image display if the state of charge of the second battery is less than or equal to the state of charge threshold.
7. The virtual image display system of claim 4, wherein if the state of charge of the second battery is less than or equal to the state of charge threshold, the hand-held electronic device is further configured to activate a power-saving mechanism of the virtual image display system to reduce power consumption of the hand-held electronic device and the virtual image display, wherein the power-saving mechanism of the virtual image display system comprises adjusting down a charging current of the second battery; turning down the speaker volume of the virtual image display; and adjusting down the screen backlight brightness of the virtual image display, adjusting down the display frame rate of the virtual image display, and adjusting down at least one of the frequencies of the working frequency of the virtual image display.
8. A power management method applied between a handheld electronic device with a first battery and a virtual image display with a second battery includes the steps of:
calculating the power supply available time of the first battery;
calculating an expected discharge time of the second battery under discharge conditions;
comparing the available power time and the expected discharge time to generate a comparison result; and
and adjusting the supply current supplied to the virtual image display by the handheld electronic device according to the comparison result.
9. The power management method of claim 8, wherein the step of calculating the suppliable time of the first battery comprises:
detecting a first state of charge of the first battery;
detecting a state of charge change rate of the first battery; and
dividing the state of charge of the first battery by a first rate of change of state of charge of the first battery to calculate the powered time.
10. The power management method of claim 8, wherein the discharge condition comprises a total capacity of the second battery and a preset discharge current value of the second battery, wherein the step of calculating the expected discharge time of the second battery under the discharge condition comprises:
detecting the state of charge of the second battery; and
and dividing the product of the total capacity of the second battery and the electric quantity state of the second battery by a preset discharge current value of the second battery to calculate the expected discharge time.
11. The method according to claim 8, wherein if the comparison result indicates that the available power time is greater than or equal to the expected discharging time, the method further comprises:
subtracting a preset discharge current value of the second battery from the required current value of the virtual image display to obtain a current upper limit value; and
and limiting the current value of the supply current to the current upper limit value.
12. The method according to claim 8, wherein if the comparison result indicates that the power-available time is less than the expected discharging time, the method further comprises:
activating a power-save mechanism of the handheld electronic device to reduce power consumption of the handheld electronic device,
the power saving mechanism of the handheld electronic device includes at least one of adjusting and reducing the backlight brightness of the screen of the handheld electronic device, adjusting and reducing the antenna emission efficiency of the handheld electronic device, and adjusting and reducing the operating frequency of the handheld electronic device.
13. The method according to claim 11, wherein if the comparison result indicates that the available power time is greater than or equal to the expected discharging time, the method further comprises:
judging whether the electric quantity state of the second battery is smaller than or equal to an electric quantity state threshold, if the electric quantity state of the second battery is smaller than or equal to the electric quantity state threshold, then:
making the supply current equal to a desired current value of the virtual image display.
14. The method of claim 13, wherein if the state of charge of the second battery is less than or equal to the state of charge threshold, the method further comprises:
activating a power-saving mechanism of the virtual image display system to reduce power consumption of the handheld electronic device and the virtual image display,
wherein the power-saving mechanism of the virtual image display system comprises at least one of adjusting down a charging current of the second battery, adjusting down a speaker volume of the virtual image display, adjusting down a screen backlight brightness of the virtual image display, adjusting down a display frame rate of the virtual image display, and adjusting down an operating frequency of the virtual image display.
CN202210430235.9A 2021-07-26 2022-04-22 Virtual image display system and power management method Pending CN115686174A (en)

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EP3539285A4 (en) * 2016-11-08 2020-09-02 Pogotec, Inc. A smart case for electronic wearable device
CN108475935B (en) * 2016-11-30 2021-06-01 华为技术有限公司 Battery charging management method and terminal
DE102017129795A1 (en) * 2017-06-30 2019-01-03 Lg Display Co., Ltd. DISPLAY DEVICE AND GATE-DRIVER CONTROL CIRCUIT THEREOF, CONTROL METHOD AND VIRTUAL-REALITY DEVICE
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