US20160381255A1 - Video frame transmitting system and video frame transmitting method - Google Patents
Video frame transmitting system and video frame transmitting method Download PDFInfo
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- US20160381255A1 US20160381255A1 US14/753,014 US201514753014A US2016381255A1 US 20160381255 A1 US20160381255 A1 US 20160381255A1 US 201514753014 A US201514753014 A US 201514753014A US 2016381255 A1 US2016381255 A1 US 2016381255A1
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- 238000000034 method Methods 0.000 title claims description 38
- 238000010586 diagram Methods 0.000 description 8
- 239000013256 coordination polymer Substances 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/44004—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video buffer management, e.g. video decoder buffer or video display buffer
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- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
- G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
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- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/2007—Display of intermediate tones
- G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
- G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
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- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
- G09G5/006—Details of the interface to the display terminal
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- H—ELECTRICITY
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- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
- H04N21/440281—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display by altering the temporal resolution, e.g. by frame skipping
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
- G09G2330/022—Power management, e.g. power saving in absence of operation, e.g. no data being entered during a predetermined time
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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- G09G2340/04—Changes in size, position or resolution of an image
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- G09G2370/10—Use of a protocol of communication by packets in interfaces along the display data pipeline
Definitions
- the present application relates to a video frame transmitting system and a video frame transmitting method, and particularly relates to a video frame transmitting system and a video frame transmitting method that can skip transmitting at least one video frame without a video frame buffer.
- a related video displaying system usually comprises an application processor and a display driver.
- the application processor (ex. a processing unit) receives input video frames and transmits the input video frames to the display driver.
- the display driver receives input video frames from the application processor and writes the input video frame to each line of the display.
- the display driver can control the displaying operation of the display as well.
- FIG. 1 is a schematic diagram illustrating related art video frame transmitting methods.
- the application processor transmits every video frame to the display driver (i.e. all video frames F_ 1 -F_n are treated as active input video frames).
- the display driver may only transmit part of the input video frames to the display (ex. only video frames F_ 1 , F_ 4 , and F_ 7 ). Therefore, the application processor wastes much power to transmit video frames which will be skipped later.
- the user may perceive a delay issue for the display.
- a touch control apparatus with a touch control panel (ex. a smart phone)
- the user may perceive a delay issue for the display.
- the user touches the touch control panel at a time point t 1 and content of the video frame F_ 6 is correspondingly different from content of the video frame F_ 5 at a time point t 2 .
- the video frame F_ 6 is still skipped by the display driver and not displayed on the display. Therefore, the applicant may feel the displaying operation is delayed. Such delay issue becomes worse if the video frame rate is low.
- a video frame buffer must be included in the video displaying system to skip the video frame.
- the input video frames from the application processor are registered in the video frame buffer, and the video frames are fetched from the video frame buffer and transmitted to the display when the video frames are active input video frames.
- MIPI Mobile Industry Processor Interface
- one objective of the present application is to provide a video frame transmitting system and a video frame transmitting method that can control the application processor to skip video frames without a video frame buffer.
- one objective of the present application is to provide a video frame transmitting system and a video frame transmitting method that can reduce the delay issue for the display.
- the video frame transmitting system for transmitting at least one output video frame to a display based on content of at least one input video frame.
- the video frame transmitting system comprises a display driver for receiving an active input video frame and for outputting the active input video frame as the output video frame to the display.
- the video frame transmitting system comprises: an application processor, receiving at least one input video frame, for determining the input video frame as the active input video frame if the content of the input video frame is different from content of a previous input video frame, and for determining the input video frame as a skip input video frame if the content of the input video frame is the same as the content of the previous input video frame.
- the application processor outputs the active input video frame to the display driver but does not output the skip input video frame.
- Another embodiment of the present application discloses a video frame transmitting method for transmitting at least one output video frame to a display based on content of at least one input video frame.
- the display receives the output video frame from a display driver.
- the display driver receives an active input video frame and outputs the active input video frame as the output video frame.
- the video frame transmitting method comprises: receiving the input video frame via an application processor, determining the input video frame as the active input video frame if the content of the input video frame is different from content of a previous input video frame, and determining the input video frame as a skip input video frame if the content of the input video frame is the same as the content of the previous input video frame; and outputting the active input video frame from the application processor to the display driver but not outputting the skip input video frame from the application processor.
- the application processor can skip video frames without a video frame buffer. Also, the delay issue for the display can be reduced, if an input video frame has different content from the content of a previous frame corresponding to the touch is determined as an active input video frame.
- FIG. 1 is a schematic diagram illustrating related art video frame transmitting methods.
- FIG. 2 is a block diagram illustrating a video frame transmitting system applying a video frame transmitting method according to one embodiment of the present application.
- FIG. 3 to FIG. 6 are schematic diagrams illustrating the detail about transmitting active input video frames based on the video frame transmitting method according to one embodiment of the present application.
- FIG. 7 is a schematic diagram illustrating the video frame transmitting method according to one embodiment of the present application.
- FIG. 8 is a flow chart illustrating a video frame transmitting method according to one embodiment of the present application.
- FIG. 2 is a block diagram illustrating a video frame transmitting system 200 applying a video frame transmitting method according to one embodiment of the present application.
- video frame transmitting system 200 is based on the MIPI standard. However, it is for illustrative purpose only, but not a limitation.
- the video frame transmitting system 200 may comprise an application processor 201 .
- the application processor 201 which can be a processing unit or any other device, may receive at least one input video frame IVF.
- the application processor 201 may determine the input video frame IVF as an active input video frame if the content of the input video frame IVF is different from the content of a previous input video frame. Further, the application processor 201 may determine the input video frame IVF as a skip input video frame if the content of the input video frame is the same as the content of a previous input video frame.
- Many methods can be applied to determine if the content of the input video frame is different from the content of the previous input video frame or not. For example, if the content of the input video frame is different from the content of the previous input video frame, some indicating data of the input video frame correspondingly changes, such that the application processor 201 can know the content of the input video frame is different from the content of the previous input video frame. In one embodiment, software executed by the application processor 201 may get the information that the content of the input video frame is different from the content of the previous input video frame, thus can inform other devices of such information.
- the application processor 201 may output the active input video frame AIVF to a display driver 203 , but does not output the skip input video frame.
- the display driver 203 may receive the active input video frame AIVF from the application processor 201 , control the display 205 , and output the active input video frame AIVF as the output video frame OVF to the display 205 .
- the input video frame IVF can come from various kinds of video sources.
- the video frame transmitting system 200 is applied to a mobile electronic device, thus the input video frame IVF can be from a baseband processor 211 .
- the antenna 207 may receive the video signal VS via wireless transmission.
- the RF processor 209 may receive the video signal VS and convert it to a RF video signal RVS.
- the baseband processor 211 may convert the RF video signal RVS to the input video frame IVF.
- it does not mean to limit that the input video frame IVF is from the baseband processor 211 .
- the application processor 201 may output the active input video frame AIVF at a data pin DP, which can be a single ended pin or a differential pin. Also, the application processor 201 may receive a transmitting clock signal TCS via a clock pin CP and transmits the active input video frame AIVF based on the transmitting clock signal TCS.
- the transmitting clock signal TCS can be generated from a clock source 213 (ex. an oscillator). However, the clock source is not limited to locate outside the video frame transmitting system 200 .
- the video frame transmitting system 200 excludes the display driver 203 .
- the display driver 203 is included in the video frame transmitting system 200 .
- FIG. 3 to FIG. 6 are schematic diagrams illustrating the video frame transmitting method according to one embodiment of the present application.
- the application processor 201 may output the active input video frame AIVF to the display driver 203 , but may not output the skip input video frame.
- the application processor 201 may output the active input video frame AIVF in at least one corresponding active time period marked T_A in the following embodiments, and may not output the skip input video frame in at least one corresponding skip time period marked T_S in the following embodiments.
- a length of the skip time period T_S may be equal to a length of a time period for transmitting an input video frame.
- the application processor 201 may output the active input video frame in the active time period T_A and may not output the skip input video frame in the skip time period T_S.
- the active input video frame may be transmitted in a packet format.
- the packets for the active input video frame can be classified to a header packet group H and a data packet group D.
- the header packet group H can comprise at least one header packet for synchronization between the application processor and the display driver.
- the data packet group D can comprise at least one data packet comprising image data for the input video frame.
- the application processor 201 may not output the skip input video frame and may keep the data pin DP, the clock pin CP at a predetermined voltage level, which is marked LP. In other embodiments, the application processor 201 can further provide sync packets in the skip time period T_S.
- the application processor 201 may further generate at least one vertical sync packet (ex. VSS and VSE) indicating start timing of the skip time period T_S to the display driver, for at least one of the skip time period T_S.
- VSS and VSE vertical sync packet
- the application processor 201 may keep the data pin DP, the clock pin CP at the predetermined voltage level.
- the vertical sync packet can indicate start timing of the skip time period T_S, thus the display driver can synchronize with the application processor according to the vertical sync packet.
- the application processor 201 may further generate the vertical sync packet in the active time period, as shown in FIG. 4 .
- the application processor 201 can provide other kinds of sync packets for synchronization. As shown in FIG. 5 , the application processor 201 may generate at least one horizontal sync packet (ex. HSS, HSE) indicating each line (ex. row or column)of the skip input video frame to the display driver 203 , for the at least one skip time period T_S. As mentioned above, the horizontal sync packet(s) HSS and HSE may indicate each line of the skip input video frame, thus the display driver can synchronize with the application processor according to the horizontal sync packet(s). In one embodiment, the application processor 201 may further generate the horizontal sync packet in the active time period, but not illustrated in FIG. 5 .
- the application processor 201 can provide both the vertical sync packet and the horizontal sync packet in the skip time period T_S, as shown in FIG. 6 .
- the application processor 201 can provide both the vertical sync packet and the horizontal sync packet in the active time period T_A, but not illustrated for brevity here.
- the video frame transmitting system illustrated in FIG. 2 and the video frame transmitting method described above can base on the MIPI standard.
- the MIPI standard comprises two modes: the command mode and the video mode.
- the command mode the application processor transmits input video frames to a video frame buffer and the input video frames are stored in the video frame buffer.
- the display driver fetches the input video frame from the video frame buffer and transmits to the display when the input video frames are needed.
- the application processor continuously transmits data to the display driver, the display driver continuously transmits data to the display, and no video frame buffer is needed.
- the above-mentioned embodiments can be regarded as a modified video mode since no video frame buffer is needed, and the applicant processor 201 may continuously transmit data (ex. sync packets) to the display driver.
- FIG. 7 is a schematic diagram illustrating the video frame transmitting method according to one embodiment of the present application.
- the application processor 201 can output only the active input video frames F_ 1 , F_ 4 , F_ 6 , F_ 7 and skip the skip input video frames F_ 2 , F_ 3 , F_ 5 rather than output all input video frames.
- the video frame transmitting method is applied to a touch control apparatus comprising a touch control panel.
- the touch control apparatus can be a mobile phone, a wearable device, a tablet, a television or any other electronic device being controlled by touch actions.
- the application processor 201 may determine a next one of the input video frame as the active input video frame if a user touches the touch control panel. For example, the user may touch the touch control panel at a time point t 1 , then the application processor 201 may determine a next input video frame F_ 6 , which has content different from the content of the input video frame F_ 5 corresponding to the touch operation, as an active input video frame. Then the application processor 201 may output the input video frame F_ 6 accordingly. By this way, the delay issue for the display can be avoided.
- the input video frame which has content different from the content of the previous input video frame corresponding to the user's touch is not limited to an input video frame next to the user's touch.
- FIG. 8 is a flow chart illustrating a video frame transmitting method according to one embodiment of the present application.
- the video frame transmitting method depicted in FIG. 8 can be applied to transmit at least one output video frame to a display (ex. display 205 in FIG. 2 ) based on content of at least one input video frame.
- the display may receive the output video frame from a display driver (ex. display driver 203 in FIG. 2 ).
- the display driver may receive at least one active input video frame and may output the active input video frame as the output video frame.
- the video frame transmitting method in FIG. 8 comprises the following steps:
- the application processor can skip input video frames without a video frame buffer. Also, the delay issue for the display can be reduced, if an input video frame has different content from the content of a previous frame corresponding to the touch is determined as an active input video frame.
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Abstract
Description
- The present application relates to a video frame transmitting system and a video frame transmitting method, and particularly relates to a video frame transmitting system and a video frame transmitting method that can skip transmitting at least one video frame without a video frame buffer.
- A related video displaying system usually comprises an application processor and a display driver. The application processor (ex. a processing unit) receives input video frames and transmits the input video frames to the display driver. The display driver receives input video frames from the application processor and writes the input video frame to each line of the display. The display driver can control the displaying operation of the display as well.
-
FIG. 1 is a schematic diagram illustrating related art video frame transmitting methods. As shown inFIG. 1 , the application processor transmits every video frame to the display driver (i.e. all video frames F_1-F_n are treated as active input video frames). However, the display driver may only transmit part of the input video frames to the display (ex. only video frames F_1, F_4, and F_7). Therefore, the application processor wastes much power to transmit video frames which will be skipped later. - Also, if such video frame transmitting method is applied to a touch control apparatus with a touch control panel (ex. a smart phone), the user may perceive a delay issue for the display. For more detail, if the user touches the touch control panel at a time point t1, and content of the video frame F_6 is correspondingly different from content of the video frame F_5 at a time point t2. However, the video frame F_6 is still skipped by the display driver and not displayed on the display. Therefore, the applicant may feel the displaying operation is delayed. Such delay issue becomes worse if the video frame rate is low.
- Furthermore, if the video frame transmitting method follows a MIPI (Mobile Industry Processor Interface) standard, a video frame buffer must be included in the video displaying system to skip the video frame. For more detail, the input video frames from the application processor are registered in the video frame buffer, and the video frames are fetched from the video frame buffer and transmitted to the display when the video frames are active input video frames. Such structure increases the size and cost of the video frame transmitting system.
- Therefore, one objective of the present application is to provide a video frame transmitting system and a video frame transmitting method that can control the application processor to skip video frames without a video frame buffer.
- Therefore, one objective of the present application is to provide a video frame transmitting system and a video frame transmitting method that can reduce the delay issue for the display.
- One embodiment of the present application discloses a video frame transmitting system for transmitting at least one output video frame to a display based on content of at least one input video frame. The video frame transmitting system comprises a display driver for receiving an active input video frame and for outputting the active input video frame as the output video frame to the display. The video frame transmitting system comprises: an application processor, receiving at least one input video frame, for determining the input video frame as the active input video frame if the content of the input video frame is different from content of a previous input video frame, and for determining the input video frame as a skip input video frame if the content of the input video frame is the same as the content of the previous input video frame. The application processor outputs the active input video frame to the display driver but does not output the skip input video frame.
- Another embodiment of the present application discloses a video frame transmitting method for transmitting at least one output video frame to a display based on content of at least one input video frame. The display receives the output video frame from a display driver. The display driver receives an active input video frame and outputs the active input video frame as the output video frame. The video frame transmitting method comprises: receiving the input video frame via an application processor, determining the input video frame as the active input video frame if the content of the input video frame is different from content of a previous input video frame, and determining the input video frame as a skip input video frame if the content of the input video frame is the same as the content of the previous input video frame; and outputting the active input video frame from the application processor to the display driver but not outputting the skip input video frame from the application processor.
- In view of above-mentioned embodiments, the application processor can skip video frames without a video frame buffer. Also, the delay issue for the display can be reduced, if an input video frame has different content from the content of a previous frame corresponding to the touch is determined as an active input video frame.
- These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
-
FIG. 1 is a schematic diagram illustrating related art video frame transmitting methods. -
FIG. 2 is a block diagram illustrating a video frame transmitting system applying a video frame transmitting method according to one embodiment of the present application. -
FIG. 3 toFIG. 6 are schematic diagrams illustrating the detail about transmitting active input video frames based on the video frame transmitting method according to one embodiment of the present application. -
FIG. 7 is a schematic diagram illustrating the video frame transmitting method according to one embodiment of the present application. -
FIG. 8 is a flow chart illustrating a video frame transmitting method according to one embodiment of the present application. -
FIG. 2 is a block diagram illustrating a video frame transmittingsystem 200 applying a video frame transmitting method according to one embodiment of the present application. In the following embodiment, video frame transmittingsystem 200 is based on the MIPI standard. However, it is for illustrative purpose only, but not a limitation. As shown inFIG. 2 , the videoframe transmitting system 200 may comprise anapplication processor 201. Theapplication processor 201, which can be a processing unit or any other device, may receive at least one input video frame IVF. Theapplication processor 201 may determine the input video frame IVF as an active input video frame if the content of the input video frame IVF is different from the content of a previous input video frame. Further, theapplication processor 201 may determine the input video frame IVF as a skip input video frame if the content of the input video frame is the same as the content of a previous input video frame. - Many methods can be applied to determine if the content of the input video frame is different from the content of the previous input video frame or not. For example, if the content of the input video frame is different from the content of the previous input video frame, some indicating data of the input video frame correspondingly changes, such that the
application processor 201 can know the content of the input video frame is different from the content of the previous input video frame. In one embodiment, software executed by theapplication processor 201 may get the information that the content of the input video frame is different from the content of the previous input video frame, thus can inform other devices of such information. - The
application processor 201 may output the active input video frame AIVF to adisplay driver 203, but does not output the skip input video frame. Thedisplay driver 203 may receive the active input video frame AIVF from theapplication processor 201, control thedisplay 205, and output the active input video frame AIVF as the output video frame OVF to thedisplay 205. - The input video frame IVF can come from various kinds of video sources. In one embodiment, the video frame transmitting
system 200 is applied to a mobile electronic device, thus the input video frame IVF can be from abaseband processor 211. For more detail, theantenna 207 may receive the video signal VS via wireless transmission. TheRF processor 209 may receive the video signal VS and convert it to a RF video signal RVS. Additionally, thebaseband processor 211 may convert the RF video signal RVS to the input video frame IVF. However, it does not mean to limit that the input video frame IVF is from thebaseband processor 211. - Besides, in one embodiment the
application processor 201 may output the active input video frame AIVF at a data pin DP, which can be a single ended pin or a differential pin. Also, theapplication processor 201 may receive a transmitting clock signal TCS via a clock pin CP and transmits the active input video frame AIVF based on the transmitting clock signal TCS. The transmitting clock signal TCS can be generated from a clock source 213 (ex. an oscillator). However, the clock source is not limited to locate outside the video frame transmittingsystem 200. - Please note, in the above-mentioned embodiment, the video frame transmitting
system 200 excludes thedisplay driver 203. However, in another embodiment, thedisplay driver 203 is included in the videoframe transmitting system 200. -
FIG. 3 toFIG. 6 are schematic diagrams illustrating the video frame transmitting method according to one embodiment of the present application. As mentioned above, theapplication processor 201 may output the active input video frame AIVF to thedisplay driver 203, but may not output the skip input video frame. For more detail, theapplication processor 201 may output the active input video frame AIVF in at least one corresponding active time period marked T_A in the following embodiments, and may not output the skip input video frame in at least one corresponding skip time period marked T_S in the following embodiments. In one embodiment, a length of the skip time period T_S may be equal to a length of a time period for transmitting an input video frame. - As shown in
FIG. 3 , theapplication processor 201 may output the active input video frame in the active time period T_A and may not output the skip input video frame in the skip time period T_S. In one embodiment, the active input video frame may be transmitted in a packet format. In one embodiment, the packets for the active input video frame can be classified to a header packet group H and a data packet group D. However, it is for illustrative purpose only, but not a limitation. The header packet group H can comprise at least one header packet for synchronization between the application processor and the display driver. Besides, the data packet group D can comprise at least one data packet comprising image data for the input video frame. - In the skip time period T_S, the
application processor 201 may not output the skip input video frame and may keep the data pin DP, the clock pin CP at a predetermined voltage level, which is marked LP. In other embodiments, theapplication processor 201 can further provide sync packets in the skip time period T_S. - As shown in
FIG. 4 , theapplication processor 201 may further generate at least one vertical sync packet (ex. VSS and VSE) indicating start timing of the skip time period T_S to the display driver, for at least one of the skip time period T_S. In other time periods that the vertical sync packets are not provided, which are marked by LP, theapplication processor 201 may keep the data pin DP, the clock pin CP at the predetermined voltage level. As mentioned above, the vertical sync packet can indicate start timing of the skip time period T_S, thus the display driver can synchronize with the application processor according to the vertical sync packet. In one embodiment, theapplication processor 201 may further generate the vertical sync packet in the active time period, as shown inFIG. 4 . - The
application processor 201 can provide other kinds of sync packets for synchronization. As shown inFIG. 5 , theapplication processor 201 may generate at least one horizontal sync packet (ex. HSS, HSE) indicating each line (ex. row or column)of the skip input video frame to thedisplay driver 203, for the at least one skip time period T_S. As mentioned above, the horizontal sync packet(s) HSS and HSE may indicate each line of the skip input video frame, thus the display driver can synchronize with the application processor according to the horizontal sync packet(s). In one embodiment, theapplication processor 201 may further generate the horizontal sync packet in the active time period, but not illustrated inFIG. 5 . - The
application processor 201 can provide both the vertical sync packet and the horizontal sync packet in the skip time period T_S, as shown inFIG. 6 . Theapplication processor 201 can provide both the vertical sync packet and the horizontal sync packet in the active time period T_A, but not illustrated for brevity here. - As mentioned above, the video frame transmitting system illustrated in
FIG. 2 and the video frame transmitting method described above can base on the MIPI standard. The MIPI standard comprises two modes: the command mode and the video mode. In the command mode, the application processor transmits input video frames to a video frame buffer and the input video frames are stored in the video frame buffer. The display driver fetches the input video frame from the video frame buffer and transmits to the display when the input video frames are needed. In the video mode, the application processor continuously transmits data to the display driver, the display driver continuously transmits data to the display, and no video frame buffer is needed. The above-mentioned embodiments can be regarded as a modified video mode since no video frame buffer is needed, and theapplicant processor 201 may continuously transmit data (ex. sync packets) to the display driver. -
FIG. 7 is a schematic diagram illustrating the video frame transmitting method according to one embodiment of the present application. As illustrated inFIG. 7 , theapplication processor 201 can output only the active input video frames F_1, F_4, F_6, F_7 and skip the skip input video frames F_2, F_3, F_5 rather than output all input video frames. By this way, the power consumption can be reduced. Additionally, in one embodiment the video frame transmitting method is applied to a touch control apparatus comprising a touch control panel. The touch control apparatus can be a mobile phone, a wearable device, a tablet, a television or any other electronic device being controlled by touch actions. Theapplication processor 201 may determine a next one of the input video frame as the active input video frame if a user touches the touch control panel. For example, the user may touch the touch control panel at a time point t1, then theapplication processor 201 may determine a next input video frame F_6, which has content different from the content of the input video frame F_5 corresponding to the touch operation, as an active input video frame. Then theapplication processor 201 may output the input video frame F_6 accordingly. By this way, the delay issue for the display can be avoided. However, please note the input video frame which has content different from the content of the previous input video frame corresponding to the user's touch is not limited to an input video frame next to the user's touch. - In view of above-mentioned embodiments, a video frame transmitting method according to one embodiment of the present application can be acquired.
FIG. 8 is a flow chart illustrating a video frame transmitting method according to one embodiment of the present application. The video frame transmitting method depicted inFIG. 8 can be applied to transmit at least one output video frame to a display (ex. display 205 inFIG. 2 ) based on content of at least one input video frame. The display may receive the output video frame from a display driver (ex. display driver 203 inFIG. 2 ). The display driver may receive at least one active input video frame and may output the active input video frame as the output video frame. - The video frame transmitting method in
FIG. 8 comprises the following steps: -
Step 801 - Receive at least one input video frame via an application processor.
-
Step 803 - Determine the input video frame as an active input video frame if the content of the input video frame is different from the content of a previous input video frame, and determine the input video frame as a skip input video frame if the content of the input video frame is the same as the content of a previous input video frame.
-
Step 805 - Do not output the skip input video frame from the application processor.
-
Step 807 - Output the active input video frame from the application processor.
- In view of above-mentioned embodiments, the application processor can skip input video frames without a video frame buffer. Also, the delay issue for the display can be reduced, if an input video frame has different content from the content of a previous frame corresponding to the touch is determined as an active input video frame.
- Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.
Claims (16)
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