TWI549517B - Electronic device and power saving method for video playing - Google Patents

Description

Electronic device and power saving method for playing video

The present invention relates to an electronic device, and more particularly to an electronic device and a power saving method for playing video.

As mobile electronic devices such as notebook computers, smart phones, and tablets are widely used in the lives of ordinary consumers, power management of mobile electronic devices has gradually become a manufacturer of mobile electronic devices when designing and manufacturing mobile electronic devices. The problem that must be considered. In mobile electronic devices, the power consumption of the display panel is more important in mobile electronic devices. In the 1.3 version of the Embedded Display Port (eDP) published by the Video Electronics Standards Association (VESA), the Panel Self Refresh (PSR) technology was proposed to reduce the display. The power consumption of the panel.

In general, the graphics processing unit (GPU) of the mobile electronic device needs to continuously transmit images to the display panel at a certain frequency, so that the display panel displays the contents of the current image. When the mobile electronic device uses the PSR technology, the display panel will include the image that can be stored on the current screen. The scratchpad of the content. When the central processing unit (CPU) of the mobile electronic device compares the video content before and after the GPU calculation, if the current display screen is determined to be a still image, for example, a file is displayed and the cursor is not moved, the CPU is A signal can be sent to the panel notification panel to directly read the image in the scratchpad for display, and the GPU and related components are turned off, so that the GPU does not need to continuously generate and transmit the same image content to the display panel to save power. However, such a technology can only be used in a static image that is completely still at present, how to save power when the image content displayed on the display panel includes video, or to save power consumption of the GPU and the display panel in other ways. It has become a problem that must be solved by those skilled in the art.

The invention provides an electronic device and a power saving method for playing video, so that the electronic device can save power consumption of the GPU and the display panel when playing video.

The electronic device of the present invention comprises a system unit and a display unit. The system unit analyzes a video stream, wherein the video stream includes a plurality of frames consecutively at a plurality of time points, and determines a frame image in each frame and a frame in a frame corresponding to a time point before each frame When the images are the same, the corresponding frame is stored in a record table, and the frame in the video stream and/or the plurality of self-refresh signals are selectively transmitted according to the record table, wherein the self-refresh signal corresponds to the portion in the frame. Share. The display unit is coupled to the system unit, receives the frame and/or self-refresh signal, and displays the video stream based on the frame and/or the self-refresh signal. Wherein, the display unit includes a temporary time with a temporary register a sequence controller and a display panel, the timing controller sequentially transmits the frame in the video stream to the display panel, and temporarily stores the frame corresponding to the previous time point in the temporary register, and the timing control unit receives the self-refresh At the time of the signal, the timing control unit transfers the frame corresponding to the previous time point in the register to the display panel.

The power saving method for playing video of the present invention is applicable to an electronic device, and includes the following steps. First, a video stream is analyzed, wherein the video stream includes a plurality of frames consecutively at multiple points in time. Then, it is determined that when a frame image in each frame is the same as a frame image in a frame corresponding to a time point before each frame, the corresponding frame is stored in a record table. Then, the frame and/or the plurality of self-refresh signals in the video stream are selectively transmitted according to the record table, wherein the self-refresh signal corresponds to a portion of the frame. Furthermore, the video stream is displayed according to the frame and/or the self-refresh signal. And, when the video stream is displayed according to one of the self-refresh signals, the frame corresponding to the previous time point of the self-refresh signal is accessed from a register to display the video stream.

Based on the above, the present invention provides an electronic device and a power saving method for playing video. The image content of the display unit can be the same in the frame by comparing whether the frame of the video is identically and selectively transmitting the self-refresh signal to the display unit. When the frame of the previous time point in the scratchpad is directly read, the power consumption of the GPU is saved.

The above described features and advantages of the invention will be apparent from the following description.

10‧‧‧Electronic devices

110‧‧‧System Unit

111‧‧‧Central Processing Unit

112‧‧‧Image Processor

120‧‧‧Display unit

121‧‧‧Timing controller

1211‧‧‧ register

122‧‧‧ display panel

20‧‧‧Transfer frame

210‧‧‧ Actual frame

220‧‧‧Area

HB1‧‧‧ horizontal blanking interval information

VBI‧‧‧Vertical blanking interval information

VF, VF’‧‧‧ frame

PSR‧‧‧ self-refresh signal

X1, X2‧‧‧

Y1, Y2‧‧‧ side width

T1, t2‧‧‧ generation time

FIG. 1 is a block diagram of an electronic device according to an embodiment of the invention.

FIG. 2 is a schematic diagram showing the relationship between a transfer frame and an actual frame according to an embodiment of the invention.

FIG. 3 is a flow chart showing the steps of a power saving method for playing video according to an embodiment of the invention.

FIG. 1 is a block diagram of an electronic device according to an embodiment of the invention. Referring to FIG. 1 , the electronic device 10 includes a system unit 110 and a display unit 120 . The system unit 110 analyzes the video stream, where the video stream includes a plurality of frames VF consecutively at a plurality of time points, and determines that the frame image in each frame VF and the frame VF corresponding to the time point of each frame VF are in the frame VF. When the frame images are the same, the corresponding frame VF is stored in the record table, and the frame VF and/or the self-refresh signal PSR (ie, the frame VF and the self-refresh signal) in the video stream are selectively transmitted according to the record table. The PSR, or one of the frame VF and the self-refresh signal PSR), wherein the self-refresh signal PSR corresponds to a portion of the frame.

The display unit 120 is connected to the system unit 110, receives the frame VF and/or the self-refresh signal PSR, and displays the video stream according to the frame VF and/or the self-refresh signal PSR. The display unit 120 includes a timing controller 121 having a register 1211 and a display panel 122. The timing controller 121 sequentially transmits the frame VF in the video stream to the display panel 122, and temporarily stores the frame VF' corresponding to the previous time point for temporary storage. In the device 1211. When the timing control unit 121 receives the self-refresh signal PSR, the timing control unit 121 transmits the frame VF' corresponding to the previous time point in the register 1211 to the display panel 122.

In the present invention, the image processor 112 is disposed in the central processing unit 111, and the image processor 112 may be independently disposed outside the central processing unit 111. The present invention is not limited to the above arrangement. When the central processing unit 111 needs to execute a program having a complicated operation, the central processing unit 111 performs the above-mentioned complicated operation through the image processor 112, and further analyzes and judges the result of the operation. For example, when the central processing unit 111 performs the determination that the frame image in each of the frames VF and the frame image in the frame VF′ corresponding to the previous time point of each frame VF are the same, the central processing unit 111 can After the calculation result is calculated by the image processor 112, the result of the calculation is determined. The actions performed by the system unit 110 in the present disclosure may be performed independently by the central processing unit 111, independently by the image processor 1112, or by the central processing unit 111 via the image processor 1112.

In this embodiment, the system unit 110 can determine each frame according to the grayscale value, the color value, or the compression mode of the frame image of each frame VF and the frame image of the frame VF′ corresponding to the previous time point. The frame image in the VF corresponds to whether the frame images in the frame VF' of the previous time point of each frame VF are the same. For example, the grayscale value may correspond to the Y parameter value in the YUV format, and the central processing unit 111 may calculate the two frame images (the frame image in the frame VF, and the previous time point) through the image processor 122. The grayscale value of the pixel at each corresponding position in the frame image of the frame VF' The difference (corresponding to the Y parameter value) is passed back to the central processing unit 111. If the system unit 110 determines that the grayscale value difference (or the sum of the grayscale value differences) of each pixel is less than a preset value, it is determined that the two frame images are the same. The color value can correspond to the RGB value of each pixel, and the determination method is similar to the method of judging that the two frame images are the same by using the grayscale value.

In addition, the system unit 110 can determine whether the frame image in the frame VF and the frame image of the frame VF' at the previous time point are the same through the compression mode of the frame in each frame VF. For example, the compression mode of the frame VF' at the previous time point is the I frame of the internal compression mode, and the current frame VF is the P frame of the prediction compression mode. Since the P frame has directly recorded the pixel difference from the previous I frame, in such a case, the system unit 110 can directly determine the frame in the two frames in the current frame VF. Whether the images are the same. If both frames are P-frames and the image of the frame in the frame is the same, the system is the same as the case where both frames are I-frames, and both frames are P-frames. 110 The calculations required for comparison are simpler. However, the various teaching methods described above may be selected or combined by actual implementation, and the present invention is not limited to the above arrangement.

When the system unit 110 determines that the frame image in the frame VF and the frame image of the frame VF' at the previous time point are the same, the system unit 110 stores the label corresponding to the frame VF on the record table (for example, A storage unit (not shown) in the system unit 110. In an embodiment of the present invention, the central processing unit 111 of the system unit 110 determines the number of labels in the record table corresponding to the frame VF that is continuous at the time point. When the amount is greater than the preset value, the system unit 110 generates a self-refresh signal PSR according to the labels corresponding to the consecutive time points of the frame, wherein the self-refresh signal PSR corresponds to the frame VF having the time points of the labels. It is worth noting that for the convenience of access, the record table in the system unit 110 does not necessarily have all the information marked. For example, in the example of the embodiment, only the start frame of the continuous frame exceeding the preset value (60 frames) and the index value of the end frame are stored in the record table, for example, the first to the 70th maps. The frame is a frame with consecutive annotations. In the record table, the index value 1 is stored in the field of the start frame, and the index value 70 is recorded in the field of the end frame, but the present invention is not limited thereto.

Hereinafter, an embodiment will be described by way of an example. It is assumed that the panel update frequency of the display panel of the display unit 120 is 60 Hz, that is, the system unit 110 must transmit the frame VF to the display unit 120 at a frequency of 60 Hz. In this example, the above preset value is set to 60 frames, that is, if there are more than 60 consecutive frames, the central processor 111 will transmit the first of these consecutive frames. The frame VF (ie, the start frame), and then the continuous frame VF, which is also labeled, replaces the original frame content with the corresponding self-refresh signal PSR.

When the user of the electronic device plays a video file (including the video stream of the N frames VF), the system unit 110 first queries the storage unit stored in the system unit 110 when transmitting the first frame VF. Any annotation in the record table corresponding to the first frame VF, since the record table is still blank at this time, the system unit 110 directly transmits the first frame VF to the timing controller 121 of the display unit 120. The timing controller 121 receives the first frame VF and stores the first frame VF in the temporary The memory 1211 is also transferred to the display panel 122.

At the same time, the system unit 110 also determines whether the frame images between the frames after the first frame VF are the same (for example, executed in the background mode). In this example, the system unit 110 determines that the 301st frame VF to the 361th frame VF are consecutively labeled frames (ie, the 301th frame to the 361th frame VF have In the same frame image, the system unit 110 records the index value 301 in the field of the start frame and the field record index value 361 in the end frame. The system unit 110 also determines that the 402th frame VF to the 490th frame also have consecutive labels, and the record table can be expressed as follows:

When the system unit 110 wants to transmit the 301th frame VF, the system unit 301 also checks whether the content corresponding to the 301th frame VF is in the query record table. The system unit 110 obtains the contents of the same frame image from the 301th frame VF to the 362th frame VF in the record table after the query record table (Table 1 above). The system unit 110 still transmits the 301st frame VF to the display unit 120. The timing controller 121 stores the 301st frame VF in the register 1211, and transmits the 301th frame VF to the display panel 122 to display the frame image of the 301th frame VF.

Then, the system unit 110 will transmit the time of the 302th frame VF. The point transmits the self refresh signal PSR to the display unit 120. When the timing unit controller 121 receives the self-refresh signal PSR, the timing controller 121 accesses the 301th frame VF from the register 1211 (this is the frame VF of the previous time point). ). When the time point from the 303th frame VF to the 361th frame VF is transmitted, the system unit 110 transmits the self-refresh signal PSR to the display unit 120 as described above. During the period in which the system unit 110 transmits the self-refresh signal PSR (ie, the time point from the 302th frame to the 361th frame VF), the system unit 110 can disable the generation of each frame VF. The image of the image processor 112 is framed to save power.

Next, when the system unit 110 subsequently wants to transmit the 362th frame VF, the system unit 110 will again access the record table to determine whether there is content corresponding to the 362th frame VF in the record table. At this time, the system unit 110 determines that there is no content corresponding to the 362th frame VF in the record table. Therefore, the system unit 110 transmits the 362th frame VF to the timing controller 121 of the display unit 120. The timing controller 121 receives the 362th frame VF and stores the 362th frame VF in the register 1211 and transmits it to the display panel 122, and so on.

On the other hand, in another embodiment of the present invention, when the central processing unit 111 determines that the number of labels corresponding to the consecutive points of time in the record table is greater than a predetermined value, the central processing unit 111 corresponds to The continuous time frame of the marked time points generates an additional information, and the additional information is attached to a start frame, wherein the start frame corresponds to the earliest time point corresponding to the frame with the mark and the time point is continuous. Frame. When the central processing unit 111 determines that the currently transmitted frame VF is the starting picture At the time of the frame, the central processing unit 111 analyzes the additional information of the frame VF to obtain a frame corresponding to the additional information, and does not transmit a frame other than the start frame corresponding to the additional information.

In simple terms, this additional information may include index values of the start frame and the end frame of consecutive frames in Table 1 above. Please refer to the above example and Table 1. For example, when the system unit 110 transmits the 301th frame VF, the system unit 110 attaches additional information such as (starting frame = 301, ending frame = 361). 301 frames VF are transmitted to the display unit 120. The next frame VF transmitted by the system unit 110 is the 362th frame VF. When the timing controller 121 of the display unit receives the 301st frame VF and the additional information, the timing controller 121 analyzes the additional information to obtain the 301th frame VF as the starting frame, and the 301th drawing. The frame VF is transmitted to the display panel 122 at the corresponding time point and simultaneously stored in the register 1211. When corresponding to the time point when the 302th frame to the 361th frame are displayed, the timing controller 121 transfers the 301st frame VF from the register 1211 to the display panel 122. The system unit 110 will periodically transmit a preset number of frames VF. In the time interval of transmitting the frame VF, the system unit 110 can disable the image processor 112 to reduce power consumption.

In this embodiment, there are some limitations on the arrangement of the electronic device 10. First, the register 1211 of the timing controller 1121 needs to have a capacity to store at least one frame VF. Moreover, unlike the foregoing embodiment, the speed at which the system unit 110 transmits the frame VF to the display unit 120 must be higher than the speed at which the timing controller 121 transmits the frame VF to the display panel 122 (ie, corresponding to the display panel 122). New frequency). In this way, the register 1211 of the timing controller 121 can always have enough frames VF so that the display of the display panel 122 is not interrupted due to the update.

Additionally, the present invention may utilize other mechanisms to conserve power consumption of system unit 110, particularly image processor 112. For example, in an embodiment of the invention, the bandwidth of the connection between the system unit 110 and the display unit 120 can transmit a frame of a larger resolution (eg, a second resolution), but the system unit 110 utilizes such a frame. The bandwidth conveys a video stream of a smaller resolution (eg, first resolution) and the frame it includes.

FIG. 2 is a schematic diagram showing the relationship between a transfer frame and an actual frame according to an embodiment of the invention. Referring to FIG. 2, the actual frame 210 corresponds to the frame VF of the embodiment shown in FIG. 1, and the length and width dimensions X1 are multiplied by Y1, which also corresponds to the first resolution described above. The length and width of the transmission frame 20 are X2 multiplied by Y2, which corresponds to the second degree of solution. It is larger than the length and width of the actual frame 210. When the image processor 120 produces a frame (e.g., frame VF), it is basically generated from top to bottom, row by row. For example, in generating the transfer frame 20, it takes time t1 to generate the actual frame 210, and time t2 is required to generate the entire transfer frame 20. Since region 220 does not have any substantial dynamic content, system unit 110 may disable image processor 120 during the time interval from time t1 to time t2 to save power.

In addition, it is worth noting that the transmission frame 20 further includes the horizontal blanking interval information (HBI) of the frame 20 and the vertical frame. Vertical Blanking Interval (VBI). Since the horizontal blanking interval information HBI and the vertical blanking interval information VBI of all the frames in the same video stream are the same when the resolution is not changed. Therefore, in the present embodiment, the horizontal blanking interval information HBI and the vertical blanking interval information VBI are transmitted only once, for example, to the first frame of the video stream. When the timing controller 121 of the display unit 120 receives the horizontal blanking interval information HBI and the vertical blanking interval information VBI, the timing controller 121 of the display unit 120 stores the horizontal blanking interval information HBI and the vertical blanking interval information VBI at the temporary In the memory 121. The timing controller 121 attaches the horizontal blanking interval information HBI and the vertical blanking interval information VBI to the frame before the timing controller 121 of the display unit 120 transmits the frame to the display panel. In this way, the image processor 112 can save processing time for adding the same horizontal blanking interval information HBI and vertical blanking interval information VBI to each frame, thereby reducing power consumption.

When the system unit 110 detects that the resolution of the video stream (ie, the first resolution described above) changes, the system unit 110 adds the horizontal blanking interval information HBI and the vertical blanking interval information VBI to the video stream. The first frame of the resolution is changed so that the display unit 120 can normally display the frame image in the frame.

It should be noted that the above-mentioned method of transmitting a small resolution so that the image processor 112 can save power consumption, and the repeated use of the horizontal blanking interval information HBI and the vertical blanking interval information VBI can be independently implemented, or the foregoing embodiment. The power saving methods mentioned in the above are implemented together, and the present invention is not limited to the above.

The invention also proposes a power saving party suitable for playing video of an electronic device law. FIG. 3 is a flow chart showing the steps of a power saving method for playing video according to an embodiment of the invention. Referring to FIG. 3, first, in step S301, a video stream is analyzed, wherein the video stream includes a plurality of frames consecutively at multiple time points. Then, in step S302, it is determined that when a frame image in each frame is the same as the frame image in the frame corresponding to the previous time point of each frame, the corresponding frame is stored in a record table.

Next, in step S303, the frame and/or the plurality of self-refresh signals in the video stream are selectively transmitted according to the record table, wherein the self-refresh signal corresponds to a portion of the frame. Further in step S304, the video stream is displayed according to the frame and/or the self-refresh signal (ie, according to the frame and the self-refresh signal, or according to one of the frame and the self-refresh signal). And in step S305, when the video stream is displayed according to one of the self-refresh signals, the frame corresponding to the previous time point of the self-refresh signal is accessed from a register to display the video stream. For the detailed implementation of the power saving method for playing video, reference may be made to the embodiment shown in FIG. 1 and FIG. 2, and details are not described herein.

In summary, the present invention provides an electronic device and a power saving method for playing video, so that when the user plays video through the electronic device, the electronic device can still save power consumption of the image processor without continuing. Generate and update the frame. In addition, in the present invention, the image processor can save more power by generating a frame with different resolution or repeatedly utilizing HBI and VBI information stored in the temporary storage device. purpose.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of protection of the present invention It is subject to the definition of the scope of the patent application attached.

10‧‧‧Electronic devices

110‧‧‧System Unit

111‧‧‧Central Processing Unit

112‧‧‧Image Processor

120‧‧‧Display unit

121‧‧‧Timing controller

1211‧‧‧ register

122‧‧‧ display panel

VF, VF’‧‧‧ frame

PSR‧‧‧ self-refresh signal

Claims (16)

An electronic device comprising: a system unit for analyzing a video stream, wherein the video stream comprises a plurality of frames consecutively at a plurality of time points, and determining a frame image in each frame and corresponding to the frame When the image of the frame in the frame at the previous time point is the same, the corresponding frame is stored in a record table, and the frames in the video stream are selectively transmitted according to the record table and/or Or a plurality of self-refresh signals, wherein the self-refresh signals correspond to portions of the frames; and a display unit connected to the system unit, receiving the frames and/or the self-refresh signals, and according to The frame and/or the self-refresh signals display the video stream, wherein the display unit includes a timing controller having a register and a display panel, the timing controller sequentially in the video stream The frames are transmitted to the display panel, and the frame corresponding to the previous time point is temporarily stored in the temporary register. When the timing control unit receives the self-refresh signal, the timing control unit transmits the temporary storage. In the device The frame of the previous time point to the display panel, wherein the video resolution of the video stream is a first resolution, and the system unit transmits the video stream with a second resolution, wherein the second resolution Greater than the first resolution. The electronic device of claim 1, wherein the system unit comprises: a storage unit; an image processor that generates the video stream; a central processing unit, coupled to the image processor and the storage unit, receiving the video stream from the image processor, and determining a frame image in each frame and the image corresponding to a previous time point When the image of the frame in the frame is the same, the corresponding table is stored in the storage unit, and the central processor selectively transmits the video stream according to the record table according to the record table. These frames and/or multiple self-refresh signals. The electronic device of claim 2, wherein: the central processor determines that when the number of the labels of the frames corresponding to the time points in the record table is greater than a preset value, the central The processor generates the self-refresh signal according to the labels, wherein the self-refresh signal corresponds to the frames consecutive to the time points of the labels; and when the video stream is transmitted, the central processor has the labels The self-refresh signals are transmitted at the time points corresponding to the frames, and the frames having the labels are not transmitted at the time points. The electronic device of claim 2, wherein: the central processor determines that when the number of the labels corresponding to the frames consecutive to the time point in the record table is greater than a preset value, The central processor generates an additional information according to the consecutive frames corresponding to the time points of the annotations, and attaches the additional information to a start frame, wherein the start frame corresponds to having the annotations and The frames consecutive to the time point correspond to the earliest frame of the time point; when the central processor transmits the video stream, and determine the currently transmitted frame When the start frame is the start frame, the central processor parses the additional information of the frame to obtain the frames corresponding to the additional information, and does not transmit the start frame of the frames corresponding to the additional information. These frames are outside. The electronic device of claim 4, wherein: when the timing controller of the display unit receives the currently received frame as the start frame, the timing controller selects the start frame And storing the start frame to the display panel according to the additional information in the start frame and the time points of the frames corresponding to the additional information. The electronic device of claim 4, wherein: the number of frames stored in the register of the display unit is greater than 1; and the system unit periodically transmits a predetermined number of the video streams in sequence. The frames are displayed to the display unit: and the average rate of the frames of the video stream transmitted by the system unit is greater than the average rate at which the timing controller transmits the frames to the display panel in the display unit. The electronic device of claim 2, wherein: the central processing unit according to the frame image of each frame and a grayscale value of the frame image of the frame corresponding to the previous time point, A color value or a compression mode determines whether the frame image of each frame in the frame corresponds to the image of the frame in the frame at a previous time point of each frame. The electronic device of claim 1, wherein the system unit transmits a horizontal blanking interval (HBI) and a frame of the frame only in one of the frames of the video stream. vertical Vertical blanking interval (VBI); when the display unit receives the horizontal blanking interval information and the vertical blanking interval information, the timing controller of the display unit compares the horizontal blanking interval information and the vertical The blanking interval information is stored in the register; and the timing controller attaches the horizontal blanking interval information and the vertical blanking interval information to the frame each time any frame is transmitted to the display panel . The electronic device of claim 8, wherein: when the system unit detects that the resolution of the video stream changes, the system unit re-adds the horizontal blanking interval information and the vertical blanking interval information to the One of the frames of the video stream. A power saving method for playing video, which is applicable to an electronic device, comprising the steps of: analyzing a video stream, wherein the video stream comprises a plurality of frames consecutively at multiple time points; determining a frame in each of the frames When the image is the same as the image of the frame corresponding to the frame at a time point before the frame, the corresponding frame is stored in a record table; and the video stream is selectively transmitted according to the record table. The frames and/or the plurality of self-refresh signals, wherein the self-refresh signals correspond to portions of the frames; the video streams are displayed according to the frames and/or the self-refresh signals; When the video stream is displayed according to one of the self-refresh signals, from a register And accessing the frame corresponding to the previous time point of the self-refresh signal to display the video stream, where the video resolution of the video stream is a first resolution, and the selectively transmitting the video stream according to the record table The step of video streaming includes transmitting the video stream at a second resolution, wherein the second resolution is greater than the first resolution. The power saving method for playing video according to claim 10, wherein the step of selectively transmitting the frames and/or the self-refresh signals in the video stream according to the record table comprises: determining when When the number of the labels corresponding to the consecutive points of the time point in the record table is greater than a preset value, the self-refresh signal is generated according to the labels, wherein the self-refresh signal corresponds to the time with the labels Continuing the frames; and the step of selectively transmitting the video stream according to the record table includes: when transmitting the video stream, at the time points corresponding to the frames having the labels The self-refresh signal is transmitted, and the frames having the annotations are not transmitted at the time points. The power saving method for playing video according to claim 10, wherein the step of selectively transmitting the frames and/or the self-refresh signals in the video stream according to the record table comprises: Determining, when the number of the labels corresponding to the consecutive frames in the record table is greater than a preset value, generating an additional information according to the consecutive frames corresponding to the time points of the labels, And appending the additional information to a start frame, wherein the start frame is corresponding to the frame corresponding to the earliest time point corresponding to the frames having the labels and consecutive time points; The step of selectively transmitting the video stream according to the record table includes: when determining that the currently transmitted frame is the start frame, parsing the additional information of the frame to obtain the map corresponding to the additional information a frame, and the frames other than the start frame of the frames corresponding to the additional information are not transmitted. The power saving method for playing video according to claim 12, wherein the displaying the video stream according to the frames and/or the self-refresh signals comprises: when the currently displayed frame is When the frame is started, the start frame is stored in the register, and the start is displayed according to the additional information in the start frame in the time points of the frames corresponding to the additional information. Frame. The power saving method for playing video according to claim 10, wherein the determining is performed when a frame image in each frame and the frame corresponding to a time point of each frame are The step of whether the image of the frame is the same includes: determining, according to the frame image of each frame and a grayscale value, a color value or a compression mode of the frame image of the frame corresponding to the previous time point The frame image in each frame corresponds to the frame in the frame at a previous point in time of each frame Whether the images are the same. The power saving method for playing video according to claim 10, wherein the step of selectively transmitting the video stream according to the record table comprises: attaching the frame only to one of the frames of the video stream. a horizontal blanking interval (HBI) and a vertical blanking interval (VBI); and the steps of the frames and/or the self-refresh signals to display the video stream The method includes: adding the horizontal blanking interval information and the vertical blanking interval information to each frame. The power saving method for playing video according to claim 15 , wherein the step of displaying the video stream by the frames and/or the self-refresh signals further comprises: detecting a resolution of the video stream When changing, the system unit reattaches the horizontal blanking interval information and the vertical blanking interval information to one of the frames of the video stream.