WO2009118840A1 - Video output device, video display device, video display system - Google Patents

Abstract

A video output device comprises a video format determining means, a video converting means, and a video output means. The video format determining means decides on the largest video output format P1 which can be transmitted and received between the video output device and a video display device connected to the video output device by the HDMI interface. When a command to change the video output format to a video output format (P2) different from the largest video output format (P1) is received while the video data is output to the video display device in the largest video output format (P1), the video converting means rearranges the video data in the video output format (P2) on the frame of the largest video output format (P1). The video output means outputs the video data (d1) rearranged by the video converting means and information (d2) about the video output format (P2) in the largest video output format (P1) to the video display device.

Description

Video output device, video display device, and video display system

The present invention relates to a video output device, a video display device, and a video display system, and can be suitably applied to, for example, a video output device, a video display device, and a video display system having an HDMI (High Definition Multimedia Interface) interface.

HDMI (High Definition Multimedia Interface) is widely used as a digital interface for AV equipment. Conventionally, multiple cables for video, audio, and control signals were used for connection between devices. However, HDMI requires only a single cable, and control signals are compatible with bidirectional transmission. In addition to being able to connect to each other simply, a single remote controller can control a plurality of AV devices.

As a technology for connecting a video output device (Source) such as a DVD (Digital Versatile Disc) player and a video display device (Sink) such as a monitor using such an HDMI interface, the video output device displays video. A technology is known that acquires information (EDID: Extended Display Identification Data) related to video specifications and audio output specifications of an apparatus from an apparatus, and outputs video and audio signals that meet the specifications of the video display apparatus (patents). Reference 1). For example, the video output device performs resolution conversion in accordance with the resolution that can be displayed by the video display device based on the EDID information, and outputs the video after the resolution conversion to the video display device.

JP 2005-109703 A

However, when the content being played back by the video output device is being output to the video display device, the video output device side, for example, changes the video output format such as the resolution according to the user's preference, according to the HDMI standard. Since re-authentication processing of HDCP (High-Bandwidth 再 Digital 発 生 Content 映像 Protection) occurs, there is a problem that the video is interrupted for several seconds to several tens of seconds. That is, there is a problem that the user is kept waiting for a certain time each time the video output format is switched.

The present invention has been made to solve the above problems, and as an example of the problem, even if the video output format is changed during video output, the time during which the video is interrupted can be greatly shortened. An object is to provide a video output device, a video display device, and a video display system.

In order to achieve the above object, the invention according to claim 1 is a video format determination means for determining a maximum video output format that can be transmitted to and received from a video display device connected by an HDMI interface, and the video format determination. After determining the maximum video output format by means, when receiving an instruction to change to a video output format different from the predetermined video output format while outputting video data to the video display device in a predetermined video output format Includes video conversion means for rearranging video data of the different video output format on a frame of the maximum video output format, video data rearranged by the video conversion means, and information on the different video output formats The video table in the maximum video output format. A video output means for outputting the device is a video output device having a.

The invention described in claim 6 is the maximum video output format that can be transmitted / received to / from the video output device from the video output device connected by the HDMI interface. Video data of the different video output formats is extracted from video input means for inputting information on different video output formats and video data on the frame of the maximum video output format according to the information on the different video output formats. A video display device comprising video conversion means and video display means for displaying the extracted video data of the different video output formats.

The invention according to claim 11 is a video display system in which a video output device and a video display device are connected by an HDMI interface, and the video output device transmits and receives between the video output device and the video display device. Video format determining means for determining the maximum possible video output format; and after the maximum video output format is determined by the video format determining means, video data is being output to the video display device in a predetermined video output format. A video conversion means for rearranging the video data of the different video output format on the frame of the maximum video output format when receiving an instruction to change to a video output format different from the predetermined video output format; The video data rearranged by the video conversion means and the different video Video output means for outputting information on the output format to the video display device in the determined video output format, the video display device from the video output device in the maximum video output format, The video input means for inputting information on the video data and the different video output formats, and the different video output formats according to the information on the different video output formats from the video data on the frame of the maximum video output format. A video display system having video conversion means for extracting the video data and video display means for displaying the extracted video data of the different video output formats.

1 is a schematic configuration diagram of a video display system according to an embodiment of the present invention. It is a figure explaining the video conversion process of the video output device concerning an embodiment of the invention concretely. It is a figure which demonstrates concretely the transmission data image in the video conversion process of the video display apparatus which concerns on embodiment of this invention. It is a flowchart which shows the flow of the video output process of the video output device which concerns on embodiment of this invention. It is a flowchart which shows the flow of the video display process of the video display apparatus which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 10 Video output device 11 Content reproduction part 12 Operation part 13,23 Video conversion part 14 Video data rearrangement process part 15 HDMI transmitter 16,25 Memory | storage part 17,26 CPU
DESCRIPTION OF SYMBOLS 20 Video display apparatus 21 HDMI receiver 22 Video data extraction process part 23 Video conversion part 24 Display panel 30 HDMI cable 31 TMDS line 32 DDC line, CEC line 100 Video display system 131,231 Resolution conversion part 132,232 I / P conversion part 133,233 Frame rate conversion unit

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Configuration>
FIG. 1 is a diagram showing a schematic configuration of a video display system 100 according to an embodiment of the present invention. The video display system 100 is an AV (Audio Visual) system capable of transmitting and receiving digital signals and control signals compliant with the HDMI (High Definition Multimedia Interface) standard. The video display system 100 outputs video content and the video content output. Is connected via an HDMI interface. That is, the video display system 100 includes a video output device 10 and a video display device 20, and the video output device 10 and the video display device 20 are connected by an HDMI cable 30.

The video output device 10 is a transmission-side device (Source) having an HDMI output terminal. Specifically, for example, a BD (Blu-ray Disc) player, a BD recorder, a DVD (Digital Versatile Disc) player, a DVD recorder, An HDD (Hard Disk Drive) recorder, a digital camera, an STB (Set-top box), an AV (Audio Visual) amplifier, and the like are assumed. In the following, the function will be described as the video output device 10 (for example, BD player) for reproducing the optical disc 1 (for example, BD).

The video display device 20 is a receiving side device (Sink) having an HDMI input terminal. Specifically, for example, a TV (Television) having a display such as an LCD (Liquid Crystal Display) or a PDP (Plasma Display Panel). Etc. are assumed. Below, a function is demonstrated as the video display apparatus 20 provided with the display and the speaker.

The HDMI cable 30 transmits a TMDS (Transition Minimized Differential Signaling) line 31 for transmitting a video / audio signal, which is a digital signal, in a differential manner, and a control signal (CEC (Consumer Electronics Control) command) common between the devices. A CEC line 32 that is a bidirectional bus for transmission and a DDC (Display Data Channel) line 32 used for transmission of EDID (Extended Display Identification Data) and HDCP (High-bandwidth Digital Content Protection) authentication Is done. Also, the HDMI cable 30 has an HPD (Hot Plug Detector) line (not shown) for notifying the connection status of the connected device.

In the present embodiment, stream data including video / audio is output from the video output device 10 to the video display device 20 via the TMDS line 31. As will be described later, the stream data is output from the video output device 10 to the video display device 20 in a unique video output format (also referred to as a unique transmission mode). Further, EDID information including device specifying information for specifying a device of the video display device 20 and video specifications and audio output specifications of the video display device 20 is transmitted from the video display device 20 to the video output device via the DDC line 32. 10 is output.

The video output device 10 includes a content reproduction unit 11, an operation unit 12, a video conversion unit 13, a video data rearrangement processing unit 14, an HDMI transmitter 15, a storage unit 16, and a CPU 17.

The content playback unit 11 reads data recorded on the optical disc 1, extracts video components and audio components from the read data, performs decoding processing, and generates digital video signals and audio signals.

The operation unit 12 receives operation information indicating an operation instruction for the video output device 10 and outputs the operation information to the CPU 17. In this embodiment, in response to an instruction from the user, operation information for changing a video output format such as resolution is received. For example, specifically, operation information for changing the resolution of the currently output video content is received by operating the resolution switching button on the remote control, or a menu screen having a higher resolution than the video content is output during video content output. The operation information for changing the resolution is output to the CPU 17.

The video conversion unit 13 converts the digital video signal generated by the content reproduction unit 11 into a desired video format under the control of the CPU 17. Specifically, the video conversion unit 13 includes a resolution conversion unit 131, an I / P conversion unit 132, and a frame rate conversion unit 133. For example, specifically, when changing the resolution, the resolution conversion unit 131 converts the pixel number 1920 × 1080 to the pixel number 1280 × 720, or when changing the scanning method, the I / P. The conversion unit 132 converts the interlace method to the progressive method, and when the frame rate is changed, the frame rate conversion unit 133 converts the frame rate from 24 Hz to 60 Hz. To do.

The video data rearrangement processing unit 14 performs data rearrangement of the video format converted by the video conversion unit 13. That is, as will be described later, the video output device 10 according to the present embodiment outputs video to the video display device 20 while fixing the video output format once set. Perform video conversion processing (hereinafter referred to as video conversion processing to the original transmission mode) for rearranging the video data of the converted video format (pixel data of the effective pixel section) on the frame of the fixed video output format It has become. The video conversion processing to the unique transmission mode is a characteristic part of the present invention, and will be described later in detail.

The HDMI transmitter 15 temporally multiplexes the digital video signal converted by the video data rearrangement processing unit 14 and the digital audio signal generated by the content reproduction unit 11, so that the digital signal conforms to the HDMI standard. The data is converted into data, and the converted digital data is output to the video display device 20 via the TMDS line 31. In the present embodiment, a video signal that has undergone video conversion processing to the original transmission mode is output to the video display device 20. Note that audio signals, control status signals, and the like are output to the video display device 20 using a blanking period.

The storage unit 16 stores a ROM that stores a control program executed by the CPU 17, a RAM that stores temporary data when the CPU 17 operates, a nonvolatile memory that stores various setting information and control information, and various data. Consists of an auxiliary storage device such as a hard disk. In addition to being stored in the storage unit 16, this control program can be recorded on AV equipment and computer-readable recording media such as portable flash memory, CD-ROM, MO, DVD-ROM, etc. Distribution via a network is also possible.

The CPU 17 comprehensively controls all operations including the content reproduction operation of the video output device 10. For example, the CPU 17 controls each unit based on the operation information so that the operation content is reflected. Further, in this embodiment, the CPU 17 relates to EDID information (specifically, video specification information of the video display device 20, specifically, resolution, scanning method, frame rate, number of bits of color gradation, etc.). Information) is acquired from the video display device 20, and an optimal video output format is set for the video display device 20. At this time, the maximum video output format among the video output formats that can be transmitted to and received from the video display device 20 is set, and HDCP authentication with the video display device 20 is performed with this maximum video output format. The video output format is fixed.

That is, when the operation information for changing the video output format (for example, resolution) is received from the user, the CPU 17 causes the video data rearrangement processing unit 14 to perform the video conversion process to the original transmission mode, and the fixed. The video is output to the video display device 20 in the video output format. Therefore, in this embodiment, even if operation information output in a video output format different from the set video output format is received during video output, HDCP re-authentication processing does not occur. Will not break for a long time.

Here, the maximum video output format is a video output format that can transmit the maximum video information (maximum amount of information), and in terms of resolution, it means that the number of pixels is maximum and scanning. Regarding the system, it means the progressive system, regarding the frame rate, it means that the frequency is maximum, and regarding the color gradation, it means that the number of bits of the color gradation is maximum. For example, 1280 × 720 pixels is a larger video output format than 720 × 480 pixels, and the scanning method is a larger video output format than the interlace method, and the frame rate is 60HZ is a larger video output format than 24Hz, and with regard to the number of bits of color gradation, 30 bits is a larger video output format than 24 bits.

FIG. 2 is a diagram specifically explaining the video conversion processing to the original transmission mode of the video data rearrangement processing unit 14. Specifically, the original transmission mode in the video data rearrangement processing unit 14 when receiving a change instruction to the video output format P2 different from the currently output video output format (set and fixed video output format) P1 It is a figure explaining the video conversion process (when converting resolution) specifically.

Suppose that the set video output format P1 is 1080p / 60Hz, and video is currently output in this video output format. In such a state, a case is considered in which a change instruction regarding resolution is received from the user, and the video output format P2 is changed to 720p / 60 Hz.

In this case, as shown in FIG. 2, the video data rearrangement processing unit 14 does not change the frame size (effective pixel section) (it remains 1920 pixels × 1080 lines), and the video data rearrangement processing unit 14 The video data d1 is created as data in which data (pixel data of 1280 pixels × 720 lines) is rearranged in the upper left of the frame. As described above, since the set resolution is the maximum resolution among the resolutions that can be transmitted to and received from the video display device 20, the changeable resolution is the set frame (1920 pixels × 1080). Line) can always be rearranged. Of the entire frame area (1920 pixels × 1080 lines), an area where video data (1280 pixel × 720 line pixel data) is actually arranged is referred to as a video presence area.

In addition to the rearranged video data d1, the video data rearrangement processing unit 14 creates information (referred to as original video output format information) d2 regarding the video output format instructed to change, and uses the vertical blanking period. Thus, the original video output format information d2 is transmitted for each frame.

FIG. 3A shows a transmission data image after video conversion processing (in the case of converting the resolution) to the original transmission mode in the video data rearrangement processing unit 14 when changing to 480p / 60 Hz is instructed. ) Is a transmission data image after video conversion processing (when converting the scanning method) to the original transmission mode in the video data rearrangement processing unit 14 when changing to 1080i / 60 Hz is instructed, FIG. This is a transmission data image after video conversion processing (in the case of converting the frame rate) to the original transmission mode in the video data rearrangement processing unit 14 when an instruction to change to 1080p / 24 Hz is given. In the case shown in FIG. 3, as in FIG. 2, the set video output format is 1080p / 60 Hz, and the video is currently output in this video output format from the user. A case is assumed in which a change instruction regarding an output format is received and a change is made to a different video output format.

In the case of FIG. 3A, as in FIG. 2, the video data rearrangement processing unit 14 does not change the frame size (effective pixel section) (it remains 1920 pixels × 1080 lines). Each time, video data d1 is created as data in which video data (pixel data of 720 pixels × 480 lines) is rearranged in the upper left of the frame.

In the case of FIG. 3B, the video data rearrangement processing unit 14 does not change the frame size (valid pixel interval) (it remains 1920 pixels × 1080 lines), and one field of video data (1920 Video data d1 is created as data in which the pixel data of pixel × 1080/2 lines is rearranged in the upper half of the frame. As described above, when the video data of each field in the interlace method is rearranged in each frame of the progressive method, the video data rearrangement processing unit 14 adds the video data arranged in each field to each frame. And arrange it.

In the case of FIG. 3C, the video data rearrangement processing unit 14 creates video data d1 by arranging video data in 24 frames of 60 frames using, for example, telecine conversion. In this way, when changing the frame rate, the video data rearrangement processing unit 14 selects a frame based on a predetermined rule, and arranges the video data only in the selected frame.

The video display device 20 includes an HDMI receiver 21, a video data extraction processing unit 22, a video conversion unit 23, a display panel 24, a storage unit 25, and a CPU 26.

The HDMI receiver 21 restores a digital video signal and an audio signal from digital data that conforms to the HDMI standard input via the TMDS line 31 and outputs the digital video signal to the video data extraction processing unit 22. The digital audio signal is subjected to audio processing by an audio signal processing unit (not shown) and output from a speaker.

The video data extraction processing unit 22 converts the digital video signal restored by the HDMI receiver 21, that is, the video data rearranged by the video data rearrangement processing unit 14 of the video output device 10 into the original video format. It is designed to convert to video data. That is, as described above, the video output device 10 of the present embodiment outputs video to the video display device 20 while fixing the video output format once set, so that the video data extraction processing unit 22 extracts the video data (pixel data arranged in the video presence area) of the original video format instructed from the video data (entire frame) of the input video output format (fixed video output format) Video conversion processing (hereinafter referred to as video conversion processing from the original transmission mode). The video conversion process from the unique transmission mode is a process of converting the received data d1 into a video signal of the original video output format according to the original video output format information d2 shown in FIG.

Here, the function (when converting the resolution) of the video data extraction processing unit 22 will be specifically described. For example, when the received video data is the video data d1 shown in FIG. 2 and the video data d1 is converted, that is, the video output format set in the video output device 10 is 1080p / 60 Hz, and the video output instructed to be changed Consider a video conversion process (when converting resolution) from the unique transmission mode in the video data extraction processing unit 22 when the format is 720p / 60 Hz.

In this case, since the video data extraction processing unit 22 knows the original resolution (1280 × 720) from the information d2 (720p / 60 Hz) regarding the original video output format, the frame (effective pixel section: 1920 pixels × The video data (pixel data) of 1280 pixels × 720 lines is cut out from the upper left of (1080 lines) to obtain the video data of the original video output format p2.

Next, the function of the video data extraction processing unit 22 (when the scanning method is converted) will be specifically described. For example, when converting the video data d1 shown in FIG. 3B, that is, when the video output format set in the video output device 10 is 1080p / 60Hz and the video output format instructed to be changed is 1080i / 60Hz. Consider video conversion processing (in the case of converting the scanning method) from the original transmission mode in the video data extraction processing unit 22.

In this case, the video data extraction processing unit 22 knows the original scanning method (interlace method) from the information d2 (1080i / 60 Hz) related to the original video output format, so the frame (effective pixel interval: 1920 pixels × The video data (pixel data) of the upper half (1920 pixels × 1080/2 lines) of 1080 lines is cut out to be the video data of the original video output format p2.

Next, the function of the video data extraction processing unit 22 (when converting the frame rate) will be specifically described. For example, when converting the video data d1 shown in FIG. 3C, that is, when the video output format set in the video output device 10 is 1080p / 60Hz and the video output format instructed to be changed is 1080p / 24Hz. Consider video conversion processing (when converting the frame rate) from the original transmission mode in the video data extraction processing unit 22.

In this case, the video data extraction processing unit 22 knows the original frame rate (24 Hz) from the information d2 (1080p / 24 Hz) related to the original video output format, so that the video data extraction processing unit 24 can start from the 60 frames according to a predetermined rule. One frame is extracted, and the video data of the extracted frame is used as the video data of the original video output format p2.

The video conversion unit 23 converts the video signal subjected to the video conversion processing by the video data extraction processing unit 22 into a desired video output format under the control of the CPU 26. Specifically, the video conversion unit 23 includes a resolution conversion unit 231, an I / P conversion unit 232, and a frame rate conversion unit 233. For example, specifically, when changing the resolution, the resolution conversion unit 231 converts the pixel number 1920 × 1080 to the pixel number 1280 × 720, or when changing the scanning method, the I / P. The conversion unit 232 converts the interlace method into the progressive method, and when the frame rate is changed, the frame rate conversion unit 133 converts the frame rate from 24 Hz to 60 Hz. To do.

The video conversion unit 23 processes the converted video signal for display and displays it on the display panel 24.

The storage unit 25 includes a ROM that stores a control program executed by the CPU 26, a RAM that stores temporary data when the CPU 26 operates, a nonvolatile memory that stores various setting information and control information, and the like. In addition to being stored in the storage unit 25, this control program can be recorded on a portable medium such as a flash memory, a CD-ROM, an MO, a DVD-ROM, or a computer-readable recording medium. Distribution via a network is also possible.

In the present embodiment, EDID information d10 is stored in the storage unit 25. The EDID information d10 is configured to include information for specifying a device, information about the video specifications and audio output specifications of the video display device 20, and the EDID information d10 is transmitted to the video output device 10 via the DDC line 32. The

The CPU 26 comprehensively controls all operations including the video display operation of the video display device 20. For example, in the present embodiment, the CPU 26 converts the video data d1 into the original video output format in accordance with the original video output format information d2 included in the transmission data from the video output device 10. The video data extraction processing unit 22 is controlled to perform the video conversion process from

<Operation>
Next, the operation of the video display system 100 according to the present embodiment will be described using FIG. 4 and FIG. 3 is a video output process in the video output device 10 of the video display system 100, and FIG. 4 is a video display process in the video display device of the video display system 100.

(1) Video Output Processing in Video Output Device 10 The video output device 10 determines whether or not it is connected to the video display device 20 (step S10). Specifically, it is determined by HPD whether or not the content transmission device 10 is connected to the content reception device 10.

When the video output device 10 is connected to the video display device 20, the video output device 10 acquires the EDID information d10 from the video display device 20 via the DDC line 32 of the HDMI cable 30 (step S20). .

Next, the video output device 10 determines whether or not the video display device 20 is compatible with the unique transmission mode (step S30). The video conversion processing in the present embodiment is performed by the video conversion function described above by both the video output device 10 and the video display device 20 (the video output device 10 is a video conversion function to a unique transmission mode, and the video display device 20 is a unique transmission mode. Video conversion function), the connected video display device 20 has the video conversion function described above (corresponding to the original transmission mode) or not (corresponding to the original transmission mode). Is not). Whether or not the original transmission mode is supported is determined based on the device identification information of the EDID information.

When the video display device 20 corresponds to the unique transmission mode (step S30: YES), the video output device 10 indicates to the video display device 20 to transmit in the unique transmission mode via the CEC line 32. (Hereinafter, referred to as a unique transmission mode command) is transmitted (step S40).

Next, the video output device 10 selects the maximum video output format from the video output formats that can be transmitted to and received from the video display device 20 based on the acquired EDID information (step S50). Specifically, the resolution, the scanning method, the frame rate, and the number of bits of the color gradation are maximized based on the information about the resolution, scanning method, frame rate, and the number of bits of the color gradation included in the acquired EDID information. The video output format (hereinafter referred to as the maximum video output format) is selected so as to become, and is fixed to the selected video output format.

Next, the video output device 10 performs HDCP authentication with the connected video display device 20 in the selected video output format (step S60). That is, the video output device 10 performs HDCP authentication with the maximum video output format.

Next, the video output device 10 determines whether or not the user has instructed to change the video output format (step S70). Specifically, it is determined whether or not there is an instruction to change the resolution, scanning method, or frame rate, and an instruction to change to a video output format different from the selected video output format is issued.

When an instruction to change to a video output format different from the selected video output format is given (step S70: YES), the video output device 10 selects video data (pixel data) of the video output format that has been instructed to change. The video data is rearranged on the video output format frame (step S80), and the rearranged video data is output in the selected video output format (step S110). Here, the rearrangement of the video data means that the video data is arranged in the video existence area by the video conversion processing to the unique mode shown in FIGS. 2 and 3. In the case of a change instruction, the video data is rearranged in the frame at the upper left, and in the case of a scan method change instruction, the video data is rearranged in the upper half of the field. In the case of an instruction to change the frame rate, the video data is rearranged only in the selected frame.

On the other hand, when the user has not instructed to change the video output format (step S70: NO), video data is output in the selected video output format (step S110).

On the other hand, when the video display device 20 does not support the unique transmission mode (step S30: NO), the video output device 10 selects a video output format based on the acquired EDID information (step S90). Specifically, an optimal video output format for the video display device 20 is selected based on information on resolution, scanning method, frame rate, and bit number of color gradation included in the acquired EDID information.

Next, the video output device 10 performs HDCP authentication with the connected video display device 20 in the selected video output format (step S100), and outputs video data in the selected video output format (step S110).

(2) Video Output Processing in Video Display Device 20 The video display device 20 determines whether or not the unique transmission mode command has been received from the video output device 10 (step S210).

When the unique transmission mode command is received from the video output device 10, the video display device 20 waits for a signal transmitted in the unique transmission mode (step S220).

Next, the video display device 20 determines whether or not a video synchronization signal is input (step S230). When the video synchronization signal is input (step S230: YES), the original video output format is determined from the received signal. Information d2 is acquired (step S240).

Next, the video display device 20 extracts a video presence area from the video data of the received signal according to the original video output format information d2 (step S250), and the video display device 20 extracts the video data of the extracted video presence area. Is enlarged or reduced in accordance with the number of display pixels (step S260) and displayed on the display panel 24 (step S290). Here, the extraction of the video presence area means that the video data of the original video output format is extracted from the frame to the received video data by the video conversion process from the unique mode.

On the other hand, when the unique transmission mode command is not received from the video output device 10, it is determined whether or not the video synchronization signal is input (step S270), and when the video synchronization signal is input (step S270: YES). Then, the video data of the received signal is enlarged or reduced in accordance with the number of display pixels of the video display device 20 (step S280) and displayed on the display panel 24 (step S290).

As described above, according to the video display system 100 according to the present embodiment, the video output device 10 determines the maximum video output format that can be transmitted to and received from the video display device 20, and this video output The video is output to the video display device 20 while being fixed to the format. When the video output device 10 is outputting video in the video output format to the video display device 20 and receives an instruction to change to a video output format different from the video output format, the video output device 10 Since the video data (pixel data) of the different video format is rearranged on the frame of the video output format, and the rearranged video data and information on the video output format instructed to change are transmitted to the video display device 20, the video is displayed. Even if there is an instruction to change the output format, the HDCP re-authentication process does not occur.

On the other hand, when receiving the video data in the video output format, the video display device 20 extracts an area where the video data actually exists based on information on the video output format instructed to change. Video data can be obtained.

As a result, in the video display system 100 in which the video output device 10 and the video display device 20 are connected via the HDMI interface, even if the video output device 10 changes the video output format during video output, the time during which the video is interrupted is greatly reduced. can do. That is, in video display system 100 according to the present embodiment, even if video output device 10 changes the video output format during video output, HDCP re-authentication processing does not occur, and video output device 10 and video Since the video can be displayed only in the time required for the video conversion process of the display device 20, the user is not uncomfortable.

In the video conversion processing to the original transmission mode of the above embodiment, the video data rearrangement processing unit 14 packs and rearranges video data from the upper left of the frame, but the rearrangement rules are limited to this. Instead, the video data may be packed and rearranged according to other rules. For example, you may make it rearrange according to the lower right of a flame | frame. The same applies to the case where the video data of each field of the interlace method is rearranged in each frame of the progressive method. For example, the video data may be rearranged in the lower half of the frame.

Further, in the above-described embodiment, the case where a change instruction to a video output format different from the maximum video output format is instructed while outputting video in the maximum video output format has been described as an example. It is not limited. That is, the video output device 10 determines the maximum video output format that can be transmitted / received to / from the video display device 20, performs HDCP authentication with the determined maximum video output format, and then performs a predetermined video output format (maximum video output format). The video output format may be different from the predetermined video output format while the video is output in a video output format different from the output format. Even in such a case, the video data of the video output format instructed to change is rearranged on the frame of the maximum video output format.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made to the embodiments of the present invention without departing from the gist of the present invention. Such modifications and changes can be made, and those accompanying such modifications and changes are also included in the technical scope of the present invention.

Claims (11)

Video format determining means for determining the maximum video output format that can be transmitted to and received from a video display device connected via an HDMI interface;
An instruction to change to a video output format different from the predetermined video output format while the video data is being output to the video display device in a predetermined video output format after the maximum video output format is determined by the video format determination means The video conversion means for rearranging the video data of the different video output format on the frame of the maximum video output format,
Video output means for outputting the video data rearranged by the video conversion means and information on the different video output formats to the video display device in the maximum video output format;
A video output device comprising: When the instruction to change to the different video output format is an instruction to change the resolution to less than the resolution in the maximum video output format,
The video conversion means includes
2. The video output apparatus according to claim 1, wherein the video data of the different video output format is rearranged in a predetermined partial area of the frame of the maximum video output format for each frame. When the instruction to change to the different video output format is a change instruction to change the scanning method from the progressive method to the interlace method,
The video conversion means includes
2. The video output apparatus according to claim 1, wherein the video data of the different video output format is rearranged in an area of a half of the frame of the maximum video output format for each field. When the instruction to change to the different video output format is an instruction to change the frame rate to less than the frame rate in the maximum video output format,
The video conversion means includes
2. The video output apparatus according to claim 1, wherein video data for each frame of the different video output format is rearranged in any frame selected from all the frames of the maximum video output format. 5. The video output device according to claim 1, further comprising authentication means for performing HDCP authentication with the video display device and the maximum video output format. Video for inputting video data and information related to a video output format different from the maximum video output format in a maximum video output format that can be transmitted / received to / from the video output device from a video output device connected by an HDMI interface Input means;
Video conversion means for extracting video data of the different video output format from video data on the frame of the maximum video output format according to information on the different video output format;
Video display means for displaying the extracted video data of the different video output format;
A video display device comprising: Based on the information about the different video output format, when changing the resolution,
The video conversion means includes
7. The video data of the different video output format is extracted for each frame by extracting data arranged in a predetermined partial area on the frame of the maximum video output format. Video display device. Based on the information about the different video output format, when changing the scanning method from the progressive method to the interlace method,
The video conversion means includes
7. The video display apparatus according to claim 6, wherein for each frame, data arranged in a half area of the frame of the maximum video output format is extracted and used as video data of the different video output format. When changing the frame rate based on the information on the different video output formats,
The video conversion means includes
7. The video display apparatus according to claim 6, wherein a predetermined frame is selected from all the frames of the maximum video output format, and the video data of the selected frame is used as the video data of the different video output format. 10. The video display device according to claim 6, further comprising authentication means for performing HDCP authentication with the video output device and the maximum video output format. A video display system in which a video output device and a video display device are connected via an HDMI interface,
The video output device
Video format determining means for determining a maximum video output format that can be transmitted and received between the video output device and the video display device;
An instruction to change to a video output format different from the predetermined video output format while the video data is being output to the video display device in a predetermined video output format after the maximum video output format is determined by the video format determination means The video conversion means for rearranging the video data of the different video output format on the frame of the maximum video output format,
Video output means for outputting the video data rearranged by the video conversion means and information on the different video output formats to the video display device in the determined video output format;
Have
The video display device
Video input means for inputting the video data and information relating to the different video output formats in the maximum video output format from the video output device;
Video conversion means for extracting video data of the different video output format from video data on the frame of the maximum video output format according to information on the different video output format;
Video display means for displaying the extracted video data of the different video output format;
A video display system comprising:

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