Display device, receiving device, receiving method, program, and recording medium

Abstract

To satisfactorily display a high-dynamic range image.SOLUTION: A display device comprises a multi-media interface terminal that is a high-speed differential signal interface, a multi-media interface receiving unit that includes a TMDS channel in one direction, a high-dynamic range processing circuit, a panel driving circuit, a display panel, and an EDID memory. The display device receives a high-dynamic range signal including high-dynamic range image data from a transmitting device via a transmission channel through the multi-media interface receiving unit, and receives information in an information frame packet related to gamma correction for the high-dynamic range image data. The multi-media interface terminal transmits, to the transmitting device from the EDID memory, information on the gamma correction included in the EDID data and can be processed by the multi-media interface terminal to display a high-dynamic range image on the display panel.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a display device, a receiving device, a receiving method, a program, and a recording medium. [Background technology]

[0002] In recent years, HDMI (High Definition Multimedia Interface) has been gaining popularity as a communication interface for transmitting digital video signals, i.e., uncompressed (baseband) video signals (image data) and digital audio signals (audio data) associated with the video signals, at high speed from, for example, DVD (Digital Versatile Disc) recorders, set-top boxes, and other AV (Audio Visual) sources to television receivers, projectors, and other displays. For example, Non-Patent Document 1 describes the details of the HDMI standard.

[0003] For example, an AV system could be considered in which a disc player as a source device and a television receiver as a sink device are connected via HDMI, and the brightness of the image data recorded on the disc player is adjusted assuming that it will be displayed on a display device with a maximum brightness of 100 cd / m2.

[0004] On the other hand, advances in technology have resulted in display devices with a maximum brightness of around 1000cd / m2, exceeding the conventional 100cd / m2, and the high brightness output capability of display devices is not being utilized.

[0005] Therefore, high dynamic range (HDR) processing has been proposed, which processes the maximum luminance of image data to exceed 100 cd / m2 and performs luminance dynamic range processing, and has been put to practical use in still image capture and post-processing. For example, Patent Document 1 proposes a recording method for HDR image data and its processing. [Prior art documents] [Non-patent literature]

[0006] [Non-Patent Document 1] High-Definition Multimedia Interface Specification Version 1.4b, October 11,2011 [Patent documents]

[0007] [Patent Document 1] JP 2005-352482 A Summary of the Invention [Problem to be solved by the invention]

[0008] Conventionally, no proposals have been made regarding high dynamic range transmission specifications for digital interfaces such as HDMI.

[0009] An object of the present technology is to enable good transmission of high dynamic range image data between devices. [Means for solving the problem]

[0010] The concept of this technology is as follows: a data transmission unit that transmits the high dynamic range image data to an external device via a transmission path; an information transmission unit that transmits transmission method information and / or gamma correction information of the high dynamic range image data transmitted by the data transmission unit to the external device via the transmission path. Located in the transmitting device.

[0011] In the present technology, the data transmission unit transmits the high dynamic range image data to the external device via the transmission path. For example, the data transmission unit may transmit the high dynamic range image data to the external device via the transmission path by a differential signal.

[0012] For example, the high dynamic range image data may include first data and second data, and the data transmission unit may configure the first data and the second data in a video format defined for stereoscopic images and transmit the data to an external device via a transmission path. Also, for example, the high dynamic range image data may include the first data and the second data, and the data transmission unit may transmit the first data as a first frame image to an external device via a transmission path, and transmit the second data as a second frame image to an external device via a transmission path.

[0013] For example, the high dynamic range image data may include first data and second data, where the first data is the lower 8 bits of the high dynamic range image data and the second data is the upper bit of the high dynamic range image data, or the first data is the upper 8 bits of the high dynamic range image data and the second data is the lower bit of the high dynamic range image data.

[0014] The information transmitting unit transmits the transmission method information and / or gamma correction information of the high dynamic range image data transmitted by the data transmitting unit to the external device via the transmission path. For example, the information transmitting unit may transmit the transmission method information and / or gamma correction information of the high dynamic range image data transmitted by the data transmitting unit to the external device by inserting the information into a blanking period of the high dynamic range image data. Also, for example, the information transmitting unit may transmit the transmission method information and / or gamma correction information of the high dynamic range image data transmitted by the data transmitting unit to the external device via a control data line constituting the transmission path.

[0015] Also, for example, the information transmitting unit may transmit the transmission method information and / or the gamma correction information of the high dynamic range image data transmitted by the data transmitting unit to the external device via a bidirectional communication path configured using a predetermined line of the transmission path. In this case, for example, the bidirectional communication path may be a pair of differential transmission paths, and at least one of the pair of differential transmission paths may have a function of receiving a notification of the connection state from the external device by a DC bias potential.

[0016] Furthermore, for example, the transmission method information and gamma correction information of the high dynamic range image data transmitted by the data transmission unit may include at least one of maximum white level information exceeding 100% of the high dynamic range image data, a bit value when expressing a black level, a bit value when expressing a 100% white level, a flag indicating whether or not high dynamic range processing has been performed, a receiving device luminance level assumed at a 100% white level, a luminance input level required for luminance expansion of the high dynamic range image, and an expanded luminance output level required for luminance expansion of the high dynamic range image.

[0017] In this way, in the present technology, high dynamic range image data is transmitted to an external device via a transmission path, and transmission method information and / or gamma correction information of the high dynamic range image data is also transmitted to the external device via the same transmission path. Therefore, the external device can easily understand, for example, what transmission method or gamma correction method is used for the transmitted high dynamic range image data, and therefore can transmit the high dynamic range image data satisfactorily.

[0018] In addition, the present technology may further include an information receiving unit that receives transmission method information and / or gamma correction method information of high dynamic range image data that is compatible with the external device and is sent from the external device via a transmission path, and a method selecting unit that selects a predetermined transmission method and / or gamma correction method from the transmission methods and / or gamma correction methods of high dynamic range image data that are compatible with the external device based on the transmission method information and / or gamma correction method information received by the information receiving unit, and the data transmitting unit may transmit the high dynamic range image data of the transmission method and / or gamma correction method selected by the method selecting unit to the external device via the transmission path.

[0019] In this case, the transmission method and / or gamma correction method of the high dynamic range image data transmitted to the external device will be compatible with the external device, so the high dynamic range image data can be transmitted satisfactorily.

[0020] Another concept of the present technology is a data receiving unit that receives high dynamic range image data for displaying a high dynamic range image from an external device via a transmission path; an information receiving unit that receives, from the external device, transmission method information and / or gamma correction information of the high dynamic range image data received by the data receiving unit; a data processing unit that processes the high dynamic range image data received by the data receiving unit based on the transmission method information and / or the gamma correction information received by the information receiving unit. in the receiving device.

[0021] In the present technology, the data receiving unit receives high dynamic range image data for displaying a high dynamic range image from an external device via a transmission path. For example, the data receiving unit may receive the high dynamic range image data from the external device via the transmission path by a differential signal.

[0022] For example, the high dynamic range image data may include first data and second data, and the data transceiver may receive the first data and the second data configured in a video format defined for stereoscopic images from an external device via a transmission path. Also, for example, the high dynamic range image data may include the first data and the second data, and the data transceiver may receive a first frame image configured with the first data and a second frame image configured with the second data from an external device via a transmission path.

[0023] For example, the high dynamic range image data may include first data and second data, where the first data is the lower 8 bits of data of the high dynamic range image and the second data is the upper bit of data of the high dynamic range image, or the first data is the upper 8 bits of data of the high dynamic range image data and the second data is the lower bit of data of the high dynamic range image data.

[0024] The information receiving unit receives from the external device the transmission method information and / or gamma correction information of the high dynamic range image data received by the data receiving unit. The data processing unit processes the high dynamic range image data received by the data receiving unit based on the transmission method information and / or gamma correction information received by the information receiving unit.

[0025] For example, the information receiving unit may extract the transmission method information and / or gamma correction information of the high dynamic range image data received by the data receiving unit from a blanking period of the high dynamic range image data. Also, for example, the information receiving unit may receive the transmission method information and / or gamma correction information of the high dynamic range image data received by the data receiving unit from an external device via a control data line constituting a transmission path.

[0026] Also, for example, the information receiving unit may receive the transmission method information and / or gamma correction information of the high dynamic range image data received by the data receiving unit from the external device via a bidirectional communication path configured using a predetermined line of the transmission path. In this case, the bidirectional communication path may be a pair of differential transmission paths, and at least one of the pair of differential transmission paths may have a function of notifying the external device of a connection state by a DC bias potential.

[0027] In this way, with this technology, high dynamic range image data sent from the transmitting side is processed based on transmission method information and / or gamma correction information also sent from the transmitting side, making it easy to perform appropriate processing on the received high dynamic range image data.

[0028] In addition, in the present technology, for example, when the energy saving mode is selected, a display control unit may be further provided that displays on the display unit whether or not to release the energy saving mode when the information receiving unit receives transmission method information of the high dynamic range image data transmitted from the external device, thereby making it possible to confirm the user's intention of whether or not to release the energy saving mode.

[0029] In addition, the present technology may further include, for example, an information storage unit that stores transmission method information and / or gamma correction method information of high dynamic range image data that the device itself can support, and an information transmission unit that transmits the transmission method information and / or gamma correction method information stored in the information storage unit to an external device via a transmission path. By sending the transmission method information and / or gamma correction method information of high dynamic range image data that the device itself can support to the transmission side in this manner, it becomes possible to have the transmission side send high dynamic range image data of the transmission method and / or gamma correction method that the device itself can support.

[0030] For example, the information storage unit may further store at least one of maximum displayable luminance information, maximum expanded luminance level information capable of high dynamic range processing, and an expansion processing prohibition flag.

[0031] Also, for example, the information storage unit may store a decompression processing prohibition flag, and may further include a storage control unit that rewrites the decompression processing prohibition flag stored in the information storage unit to invalid when the energy saving mode is selected. Also, for example, the information storage unit may store maximum luminance information that can be displayed and maximum expanded luminance level information that can be processed in a high dynamic range, and may further include a storage control unit that rewrites the maximum luminance information that can be displayed and maximum expanded luminance level information that can be processed in a high dynamic range stored in the information storage unit when the energy saving mode is selected. Effect of the Invention

[0032] According to the present technology, it is possible to transmit high dynamic range image data between devices in a satisfactory manner. Note that the effects described in this specification are merely examples and are not limiting, and additional effects may also be provided. [Brief description of the drawings]

[0033] [Figure 1] 1 is a block diagram showing an example of the configuration of an AV system according to an embodiment. [Diagram 2] 2 is a block diagram showing an example configuration of an HDMI transmitting section of a disc player and an HDMI receiving section of a television receiver. FIG. [Diagram 3] This figure shows various transmission data sections when image data of 1920 pixels horizontally and 1080 lines vertically is transmitted on TMDS channels #0, #1, and #2. [Figure 4] FIG. 1 is a diagram for explaining a conventional 8-bit transmission method. [Diagram 5] FIG. 1 is a block diagram showing an example of the configuration of a disc player (source device) that constitutes an AV system. [Figure 6] FIG. 1 is a block diagram showing an example of the configuration of a television receiver (sink device) that constitutes an AV system. [Figure 7] FIG. 1 is a diagram for explaining a transmission method (1) for transmitting HDR image data using a deep color transmission format. [Figure 8] FIG. 1 is a diagram for explaining a transmission method (2) for transmitting HDR image data using a stereoscopic video format. [Figure 9] FIG. 13 is a diagram for explaining a transmission method (3) for transmitting HDR image data using a high frame rate video format. [Figure 10] FIG. 13 is a diagram for explaining HDR information (1) transmitted in a Vendor Specific InfoFrame packet. [Figure 11] FIG. 13 is a diagram for explaining HDR information (2) transmitted in a Vendor Specific InfoFrame packet. [Figure 12] FIG. 13 is a diagram for explaining HDR information (3) transmitted in a Vendor Specific InfoFrame packet. [Figure 13] FIG. 11 is a diagram illustrating an example of the data structure of an E-EDID stored in a sink device (a television receiver). [Figure 14] 11 is a diagram illustrating an example of the data structure of a Vender Specific area of ​​E-EDID. [Figure 15] FIG. 2 is a diagram illustrating an example of the data structure of an HDMI Vendor Specific InfoFrame packet. [Figure 16] 13 is a diagram illustrating an example of the data structure of a gamma correction method (1) transmitted in a Vendor Specific InfoFrame packet. FIG. [Figure 17] 13 is a diagram illustrating an example of the data structure of a gamma correction method (2) transmitted in a Vendor Specific InfoFrame packet. FIG. [Figure 18]FIG. 13 is a diagram illustrating an example of the data structure of a gamma correction method (3) transmitted in a Vendor Specific InfoFrame packet. [Figure 19] 11 is a flowchart showing an example of processing performed by a source device (disc player) when the device is connected. [Figure 20] 11 is a flowchart showing an example of a selection process of an HDR transmission method in a source device (disc player). [Figure 21] 13 is a flowchart (continued) showing an example of the selection process of the HDR transmission method in the source device (disc player). [Figure 22] 10 is a flowchart showing an example of processing performed when a sink device (television receiver) is set to an energy saving mode. [Figure 23] 13 is a flowchart showing an example of a process for canceling an energy saving mode of a sink device (television receiver). [Figure 24] 1 is a block diagram showing an example of the configuration of a DP system using a DP interface. [Diagram 25] 11 is a diagram showing an example of a packet structure when transmitting transmission method information and gamma correction method information of HDR image data on an AUX channel. [Figure 26] FIG. 1 is a block diagram showing an example of the configuration of an MHL system using an MHL interface. [Figure 27] FIG. 13 is a diagram illustrating a CBUS packet format. [Figure 28] 11 is a diagram showing a CBUS packet format when transmitting transmission method information and gamma correction information for HDR image data on a CBUS / eCBUS line. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] Hereinafter, modes for carrying out the invention (hereinafter, referred to as "embodiments") will be described. The description will be made in the following order. 1. Embodiment 2. Variations

[0035] <1. Preferred embodiment> [AV system configuration example] 1 shows an example of the configuration of an AV (Audio Visual) system 10 according to an embodiment. The AV system 10 includes a disc player 11 as a source device and a television receiver 12 as a sink device. The disc player 11 and the television receiver 12 are connected via an HDMI cable 13 as a transmission path.

[0036] The disc player 11 is provided with an HDMI terminal 11a to which an HDMI transmitting unit (HDMI TX) 11b and a high-speed bus interface (high-speed bus I / F) 11c are connected. The television receiver 12 is provided with an HDMI terminal 12a to which an HDMI receiving unit (HDMI RX) 12b and a high-speed bus interface (high-speed bus I / F) 12c are connected. One end of an HDMI cable 13 is connected to the HDMI terminal 11a of the disc player 11, and the other end of the HDMI cable 13 is connected to the HDMI terminal 12a of the television receiver 12.

[0037] 1, uncompressed image data obtained by reproduction on the disc player 11 is transmitted to the television receiver 12 via an HDMI cable 13, and an image based on the image data transmitted from the disc player 11 is displayed on the television receiver 12. In addition, uncompressed audio data obtained by reproduction on the disc player 11 is transmitted to the television receiver 12 via the HDMI cable 13, and audio based on the audio data transmitted from the disc player 11 is output from the television receiver 12.

[0038] Fig. 2 shows an example of the configuration of the HDMI transmitting section 11b of the disc player 11 and the HDMI receiving section 12b of the television receiver 12 in the AV system 10 of Fig. 1. The HDMI transmitting section 11b transmits differential signals corresponding to pixel data of an uncompressed one screen worth of image in a single direction to the HDMI receiving section 12b over multiple channels in an effective image section 14 (hereinafter also referred to as an active video section, as appropriate) (see Fig. 3), which is a section from one vertical sync signal to the next vertical sync signal, excluding a horizontal blanking section 15 and a vertical blanking section 16. The HDMI transmitting section 11b also transmits differential signals corresponding to at least audio data, control data, other auxiliary data, etc. associated with the image in a single direction to the HDMI receiving section 12b over multiple channels in the horizontal blanking section 15 or the vertical blanking section 16.

[0039] That is, the HDMI sending unit 11b has an HDMI transmitter 21. The transmitter 21 converts, for example, pixel data of an uncompressed image into a corresponding differential signal, and transmits the signal serially in one direction to the HDMI receiving unit 12b via three TMDS (Transition Minimized Differential Signaling) channels #0, #1, and #2, which are multiple channels.

[0040] The transmitter 21 also converts audio data accompanying the uncompressed images, as well as necessary control data and other auxiliary data, into corresponding differential signals and transmits them serially in one direction to the HDMI receiver 12b via the three TMDS channels #0, #1, and #2. The transmitter 21 also transmits a pixel clock synchronized with the pixel data transmitted via the three TMDS channels #0, #1, and #2 to the HDMI receiver 12b via the TMDS clock channel. Here, in one TMDS channel #i (i=0, 1, 2), 10 bits of pixel data are transmitted during one clock of the pixel clock.

[0041] HDMI receiving unit 12b receives differential signals corresponding to pixel data transmitted in one direction from HDMI transmitting unit 11b over multiple channels during active video interval 14 (see FIG. 3). Also, HDMI receiving unit 12b receives differential signals corresponding to audio data or control data transmitted in one direction from HDMI transmitting unit 11b over multiple channels during horizontal blanking interval 15 (see FIG. 3) or vertical blanking interval 16 (see FIG. 3).

[0042] That is, the HDMI receiving unit 12b has an HDMI receiver 22. The receiver 22 receives differential signals corresponding to pixel data and differential signals corresponding to audio data and control data transmitted in one direction on TMDS channels #0, #1, and #2 from the HDMI transmitting unit 11b connected via the HDMI cable 13. At this time, the receiver 22 receives the differential signals in synchronization with the pixel clock transmitted on the TMDS clock channel from the HDMI transmitting unit 11b.

[0043] The transmission channels of the HDMI system consisting of the HDMI source transmitter 11b and the HDMI receiver 12b include three TMDS channels #0 to #2 as transmission channels for transmitting pixel data and audio data, a TMDS clock channel as a transmission channel for transmitting a pixel clock, as well as transmission channels called a DDC (Display Data Channel) 23 and a CEC (Consumer Electronics Control) line 24.

[0044] The DDC 23 is made up of two signal lines included in the HDMI cable 13, and is used by the HDMI transmitter 11b to read out E-EDID (Enhanced Extended Display Identification Data) from the HDMI receiver 12b connected via the HDMI cable 13. That is, the HDMI receiver 12b has, in addition to the HDMI receiver 22, an EDID ROM (Read Only Memory) that stores E-EDID, which is performance information related to its own performance (configuration and capability).

[0045] The HDMI transmitting unit 11b reads, via the DDC 23, the E-EDID of the HDMI receiving unit 12b from the HDMI receiving unit 12b connected via the HDMI cable 13. Then, based on the E-EDID, the HDMI transmitting unit 11b recognizes the performance settings of the HDMI receiving unit 12b, that is, for example, the image format (profile) supported by the electronic device having the HDMI receiving unit 12b, such as RGB, YCbCr4:4:4, YCbCr4:2:2, etc.

[0046] The CEC line 24 is made up of one signal line included in the HDMI cable 13, and is used for bidirectional communication of control data between the HDMI transmitter 11b and the HDMI receiver 12b. The HDMI cable 13 also includes a line (HPD line) 25 connected to a pin called HPD (Hot Plug Detect).

[0047] The source device can detect the connection of the sink device by the DC bias potential using this line 25. In this case, from the source device's perspective, the HPD line has a function of receiving notification of the connection state from the sink device by the DC bias potential. On the other hand, from the sink device's perspective, the HPD line has a function of notifying the source device of the connection state by the DC bias potential.

[0048] The HDMI cable 13 also includes a line (power line) 26 used to supply power from the source device to the sink device. The HDMI cable 13 also includes a reserved line 27. The HPD line 25 and the reserved line 27 may be used to configure a pair of differential transmission paths as a bidirectional communication path.

[0049] 3 shows various transmission data periods when image data of 1920 pixels horizontally and 1080 lines vertically is transmitted on TMDS channels #0, #1, and #2. In the video field in which data is transmitted on the three HDMI TMDS channels #0, #1, and #2, there are three types of periods according to the type of transmission data: a video data period 17, a data island period 18, and a control period 19.

[0050] Here, the video field period is the period from the rising edge of one vertical synchronization signal (active edge) to the rising edge of the next vertical synchronization signal, and is divided into a horizontal blanking period 15, a vertical blanking period 16, and an active pixel period 14 (active video), which is the video field period excluding the horizontal blanking period and the vertical blanking period.

[0051] The video data section 17 is allocated to the active pixel section 14. In this video data section 17, data of active pixels (active pixels) of 1920 pixels (picture elements) x 1080 lines constituting one screen's worth of uncompressed image data is transmitted. The data island section 18 and the control section 19 are allocated to the horizontal blanking period 15 and the vertical blanking period 16. In this data island section 18 and control section 19, auxiliary data is transmitted.

[0052] That is, the data island section 18 is allocated to a part of the horizontal blanking interval 15 and the vertical blanking interval 16. In this data island section 18, data not related to control among the auxiliary data, such as audio data packets, is transmitted. The control section 19 is allocated to the other part of the horizontal blanking interval 15 and the vertical blanking interval 16. In this control section 19, data related to control among the auxiliary data, such as vertical and horizontal synchronizing signals, control packets, etc., is transmitted.

[0053] In this embodiment, the disc player 11 receives, from the television receiver 12, transmission method information and gamma correction method information of high dynamic range image data that the television receiver 12 can support, via the HDMI cable 13. Hereinafter, high dynamic range is abbreviated as "HDR" where appropriate. In this case, the television receiver 12 stores in a storage unit transmission method information and gamma correction method information of HDR image data that it supports, and transmits this transmission method information and gamma correction method information to the disc player 11 via the HDMI cable 13. Note that, in the past, there was no transmission specification for HDR images, and there was no compatibility between manufacturers.

[0054] The disc player 11 selects a predetermined transmission method and gamma correction method from among the transmission methods of HDR image data that the television receiver can support, based on the transmission method information and gamma correction method information received from the television receiver 12. In this case, for example, when there are multiple transmission methods and gamma correction methods of HDR image data that the television receiver 12 can support, the disc player 11 selects the transmission method that causes the least image quality degradation and the gamma correction method that is easiest to approximate.

[0055] The disc player 11 transmits the HDR image data of the selected transmission method and gamma correction method to the television receiver 12 via the HDMI cable 13. At this time, the disc player 11 transmits transmission method information and gamma correction information of the HDR image data to be transmitted to the television receiver 12 via the HDMI cable 13.

[0056] The television receiver 12 receives HDR image data from the disc player 11 via the HDMI cable 13, as well as the transmission method information and gamma correction information. The television receiver 12 processes the received HDR image data based on the received transmission method information and gamma correction information to generate HDR image data for display. The maximum luminance of objects in the natural world can reach 2000 cd / m2 or more.

[0057] Conventionally, for example, image data recorded on a disc player has been adjusted for brightness on the assumption that it will be displayed on a display device with a maximum brightness specification of 100cd / m2. In other words, conventionally, the brightness of image data has been significantly compressed compared to the brightness values ​​in the natural world. In addition, display devices with a maximum brightness of about 1000cd / m2, exceeding the conventional 100cd / m2, are now in practical use. If image data originally adjusted to 100cd / m2 is processed to increase the brightness value to match 1000cd / m2 on the display device, problems will occur in the image quality.

[0058] HDR images have been proposed to represent images with high brightness of 100% or more white level brightness. In a normal 8-bit system, 100% white level brightness is represented by a bit value of 235 or 255. To represent brightness above 100% white level brightness, a bit count of 8 or more bits is required. In other words, HDR image data can be 10-bit, 12-bit, 16-bit, etc.

[0059] Fig. 4 shows a conceptual diagram of a conventional 8-bit transmission method. Fig. 4(a) shows an example of the luminance level of the original 10-bit HDR image data and the corresponding bit value. Fig. 4(b) shows an example of the luminance level of 8-bit image data converted to transmit 10-bit HDR image data in an 8-bit transmission method and the corresponding bit value. In this case, since a luminance level of 100% is assigned to an 8-bit value of "235", a luminance of 200% becomes "255", which is the maximum value of the 8-bit value, and luminance compression is performed, losing information exceeding 108% luminance.

[0060] [Disc player configuration example] 5 shows an example of the configuration of the disc player 11. The disc player 11 has an HDMI terminal 11a, an HDMI transmission unit 11b, and a high-speed bus interface 11c. The disc player 11 also has a CPU (Central Processing Unit) 104, an internal bus 105, a flash ROM (Read Only Memory) 106, an SDRAM (Synchronous Random Access Memory) 107, a remote control reception unit 108, and a remote control transmitter 109.

[0061] The disc player 11 also has a SATA (Serial Advanced Technology Attachment) interface 110, a BD (Blu-Ray Disc) drive 111, an Ethernet interface (Ethernet I / F) 112, and a network terminal 113. The disc player 11 also has an MPEG (Moving Picture Expert Group) decoder 115, a graphics generation circuit 116, a video output terminal 117, an audio output terminal 118, and an HDR processing circuit 114.

[0062] The disc player 11 may also have a display control unit 121, a panel driving circuit 122, a display panel 123, and a power supply unit 124. Note that "Ethernet" is a registered trademark. The high-speed bus interface 11c, the CPU 104, the flash ROM 106, the SDRAM 107, the remote control receiver 108, the SATA interface 110, the Ethernet interface 112, and the MPEG decoder 115 are connected to the internal bus 105.

[0063] The CPU 104 controls the operation of each part of the disc player 11. The flash ROM 106 stores control software and data. The SDRAM 107 constitutes a work area for the CPU 104. The CPU 104 loads software and data read from the flash ROM 106 onto the SDRAM 107, starts up the software, and controls each part of the disc player 11.

[0064] Remote control receiving unit 108 receives a remote control signal (remote control code) transmitted from remote control transmitter 109, and supplies it to CPU 104. CPU 104 controls each unit of disc player 11 according to the remote control code. Note that, although a remote control unit is shown as the user instruction input unit in this embodiment, the user instruction input unit may have other configurations, such as a switch, a wheel, a touch panel unit that inputs instructions by proximity / touch, a mouse, a keyboard, a gesture input unit that detects instruction input by a camera, or a voice input unit that inputs instructions by voice.

[0065] The BD drive 101 records content data onto a BD disc (not shown) serving as a disc-shaped recording medium, and plays back content data from this BD. The BD drive 111 is connected to the internal bus 105 via a SATA interface 110. The MPEG decoder 115 performs a decoding process on the MPEG2 stream played back by the BD drive 111 to obtain image and audio data.

[0066] The graphics generation circuit 116 performs processing such as superimposing graphics data as necessary on the image data obtained by the MPEG decoder 115. The video output terminal 117 outputs the image data output from the graphics generation circuit 116. The audio output terminal 118 outputs the audio data obtained by the MPEG decoder 115.

[0067] The panel driving circuit 122 drives the display panel 123 based on video (image) data output from the graphics generation circuit 260. The display control unit 121 controls the graphics generation circuit 116 and the panel driving circuit 122 to control the display on the display panel 123. The display panel 123 is composed of, for example, an LCD (Liquid Crystal Display), a PDP (Plasma Display Panel), an organic EL (Organic Electro-Luminescence) panel, or the like.

[0068] In this embodiment, an example is shown in which a display control unit 121 is provided in addition to the CPU 104, but the display on the display panel 123 may be directly controlled by the CPU 104. The CPU 104 and the display control unit 121 may be integrated into a single chip, or may have multiple cores. The power supply unit 124 supplies power to each unit of the disc player 11. This power supply unit 124 may be an AC power source or a battery (a storage battery or a dry cell).

[0069] The HDMI transmitter (HDMI source) 11b transmits baseband image (video) and audio data from the HDMI terminal 11a by HDMI-compliant communication. The high-speed bus-in interface 11c is a bidirectional communication path interface configured using predetermined lines (reserved lines and HPD lines in this embodiment) that configure the HDMI cable 13.

[0070] This high-speed bus interface 11c is inserted between the Ethernet interface 112 and the HDMI terminal 101. This high-speed bus interface 11c transmits transmission data supplied from the CPU 104 to a counterpart device from the HDMI terminal 101 via the HDMI cable 13. In addition, this high-speed bus interface 11c supplies to the CPU 104 reception data received from the counterpart device via the HDMI cable 13 and the HDMI terminal 11a.

[0071] When transmitting HDR image data for displaying an HDR image from among the image data obtained by the MPEG decoder 115 through the TMDS channel of the HDMI, the HDR processing circuit 114 processes the HDR image data into a state according to the transmission method. Here, the HDR image data is configured, for example, according to a deep color image format, a stereoscopic image data format, or a high frame rate image format. The HDR processing circuit 114 and the HDMI transmission unit 11b may be one chip or may have multiple cores. Details of the types of transmission methods for HDR image data, the selection of the transmission method, the packing format of each method, etc. will be described later.

[0072] The operation of the disc player 11 shown in Fig. 5 will be briefly described below. During recording, content data to be recorded is obtained via a digital tuner (not shown), or from the network terminal 113 via the Ethernet interface 112, or from the HDMI terminal 11a via the high-speed bus interface 11c. This content data is input to the SATA interface 110, and is recorded onto the BD by the BD drive 111. In some cases, this content data may be recorded onto a HDD (hard disk drive) (not shown) connected to the SATA interface 110.

[0073] During playback, content data (MPEG stream) played back from the BD by the BD drive 111 is supplied to the MPEG decoder 115 via the SATA interface 110. The MPEG decoder 115 decodes the played back content data to obtain baseband image and audio data. The image data is output to a video output terminal 117 via a graphics generation circuit 116. The audio data is output to an audio output terminal 118.

[0074] During playback, image data obtained by the MPEG decoder 115 is supplied to a panel drive circuit 122 via a graphics generation circuit 116 in response to a user operation, and the played-back image is displayed on a display panel 123. Also, audio data obtained by the MPEG decoder 115 is supplied to a speaker (not shown) in response to a user operation, and audio corresponding to the played-back image is output.

[0075] Furthermore, during playback, if the image and audio data obtained by the MPEG decoder 115 is transmitted over the HDMI TMDS channel, the image and audio data is supplied to the HDMI transmission unit 11b and packed, and then output from the HDMI transmission unit 11b to the HDMI terminal 11a.

[0076] In addition, when the image data is HDR image data, this HDR image data is processed by the HDR processing circuit 114 into a state according to the selected transmission method, and then supplied to the HDMI transmission unit 11b. Furthermore, when content data played back by the BD drive 111 is sent to the network during playback, this content data is output to the network terminal 113 via the Ethernet interface 112. Similarly, when content data played back by the BD drive 111 is sent to the bidirectional communication path of the HDMI cable 13 during playback, the content data is output to the HDMI terminal 11a via the high-speed bus interface 11c. Here, before outputting the image data, the data may be encrypted using copyright protection technology such as HDCP, DTCP, DTCP+, and then transmitted.

[0077] [Example of a TV receiver configuration] 6 shows an example of the configuration of the television receiver 12. The television receiver 12 has an HDMI terminal 12a, an HDMI receiving unit 12b, a high-speed bus interface 12c, and an HDR processing circuit 204. The television receiver 12 also has an antenna terminal 205, a digital tuner 206, an MPEG decoder 207, a video signal processing circuit 208, a graphics generation circuit 209, a panel drive circuit 210, and a display panel 211.

[0078] The television receiver 12 also has an audio signal processing circuit 212, an audio amplifier circuit 213, a speaker 214, an internal bus 220, a CPU 221, a flash ROM 222, and a Synchronous Random Access Memory (SDRAM) 223. The television receiver 12 also has an Ethernet interface (Ethernet I / F) 224, a network terminal 225, a remote control receiver 226, and a remote control transmitter 227. The television receiver 12 also has a display control unit 231 and a power supply unit 232. Note that "Ethernet" is a registered trademark.

[0079] The antenna terminal 205 is a terminal for inputting a television broadcast signal received by a receiving antenna (not shown). The digital tuner 206 processes the television broadcast signal input to the antenna terminal 205 and extracts a partial TS (Transport Stream) (TS packets of video data and TS packets of audio data) from a predetermined transport stream corresponding to a channel selected by the user.

[0080] Moreover, the digital tuner 206 extracts PSI / SI (Program Specific Information / Service Information) from the obtained transport stream and outputs it to the CPU 221. The process of extracting a partial TS of an arbitrary channel from a plurality of transport streams obtained by the digital tuner 206 is possible by obtaining packet ID (PID) information of the arbitrary channel from the PSI / SI (PAT / PMT).

[0081] The MPEG decoder 207 obtains image data by performing a decoding process on video PES (Packetized Elementary Stream) packets composed of TS packets of video data obtained by the digital tuner 206. The MPEG decoder 207 also obtains audio data by performing a decoding process on audio PES packets composed of TS packets of audio data obtained by the digital tuner 206.

[0082] The video signal processing circuit 208 and the graphics generation circuit 209 perform scaling processing (resolution conversion processing), superimposition processing of graphics data, gamma correction of HDR image data, etc. as necessary on the image data obtained by the MPEG decoder 207 or the image data received by the HDMI receiving unit 202.

[0083] The panel driving circuit 210 drives the display panel 211 based on video (image) data output from the graphics generation circuit 209. The display control unit 231 controls the graphics generation circuit 209 and the panel driving circuit 210 to control the display on the display panel 211. The display panel 211 is configured with, for example, an LCD (Liquid Crystal Display), a PDP (Plasma Display Panel), an organic EL (Organic Electro-Luminescence) panel, or the like.

[0084] In this embodiment, an example is shown in which a display control unit 231 is provided in addition to the CPU 221, but the display on the display panel 211 may be directly controlled by the CPU 221. The CPU 221 and the display control unit 231 may be integrated into a single chip or may have multiple cores. The power supply unit 232 supplies power to each unit of the television receiver 12. This power supply unit 232 may be an AC power source or a battery (a storage battery or a dry cell).

[0085] The audio signal processing circuit 212 performs necessary processing such as D / A conversion on the audio data obtained by the MPEG decoder 207. The audio amplifier circuit 213 amplifies the audio signal output from the audio signal processing circuit 212 and supplies it to a speaker 214. The speaker 214 may be monaural or stereo. The number of speakers 214 may be one or two or more. The speaker 214 may be an earphone or a headphone. The speaker 214 may be compatible with 2.1 channels, 5.1 channels, or the like. The speaker 214 may be connected wirelessly to the television receiver 12. The speaker 214 may be another device.

[0086] The CPU 221 controls the operation of each part of the television receiver 12. The flash ROM 222 stores control software and data. The DRAM 223 constitutes a work area for the CPU 221. The CPU 221 loads software and data read from the flash ROM 222 onto the SDRAM 223, starts up the software, and controls each part of the television receiver 12.

[0087] The remote control receiving unit 226 receives a remote control signal (remote control code) transmitted from the remote control transmitter 227 and supplies it to the CPU 221. The CPU 221 controls each unit of the television receiver 12 based on this remote control code. Note that, although a remote control unit is shown as the user instruction input unit in this embodiment, the user instruction input unit may have other configurations, such as a touch panel unit that inputs instructions by proximity / touch, a mouse, a keyboard, a gesture input unit that detects instruction input by a camera, or a voice input unit that inputs instructions by voice.

[0088] The network terminal 225 is a terminal for connecting to a network, and is connected to the Ethernet interface 224. The high-speed bus interface 12c, the CPU 221, the flash ROM 222, the SDRAM 223, the Ethernet interface 224, the MPEG decoder 207, and the display control unit 231 are connected to the internal bus 220.

[0089] The HDMI receiving unit (HDMI sink) 12b receives baseband image (video) and audio data supplied to the HDMI terminal 12a through the HDMI cable 13 by HDMI-compliant communication. The high-speed bus interface 12c is an interface for a bidirectional communication path configured using predetermined lines (reserved lines and HPD lines in this embodiment) constituting the HDMI cable 13, similar to the high-speed bus interface 11c of the disc player 11 described above.

[0090] This high-speed bus interface 12c is inserted between the Ethernet interface 224 and the HDMI terminal 201. This high-speed bus interface 12c transmits transmission data supplied from the CPU 221 to a counterpart device from the HDMI terminal 12a via the HDMI cable 13. In addition, this high-speed bus interface 12c supplies reception data received from the counterpart device from the HDMI cable 13 via the HDMI terminal 12a to the CPU 221.

[0091] When the image data received by the HDMI receiving unit 202 is HDR image data, the HDR processing circuit 204 performs processing (decoding processing) corresponding to the transmission method on the HDR image data to generate HDR image data. That is, the HDR processing circuit 204 performs processing opposite to that of the HDR processing circuit 114 of the disc player 11 described above to obtain data constituting the HDR image data. The HDR processing circuit 204 and the HDMI receiving unit 202, or the HDR processing circuit 204 and the video signal processing circuit 208, may be formed as a single chip or may have multiple cores.

[0092] In addition, the HDR processing circuit 204 performs a calculation to generate HDR image data from first data consisting of image data of the lower 8 bits of the HDR image and second data consisting of image data of the upper bits of the HDR image, or from first data consisting of image data of the upper 8 bits of the HDR image and second data consisting of image data of the lower bits of the HDR image.

[0093] For example, when the received content data is to be sent to a network, the content data is output to the network terminal 225 via the Ethernet interface 224. Similarly, when the received content data is to be sent to the bidirectional communication path of the HDMI cable 13, the content data is output to the HDMI terminal 11a via the high-speed bus interface 12c. Here, before the image data is output, it may be encrypted using a copyright protection technology such as HDCP, DTCP, or DTCP+ before being transmitted.

[0094] The operation of the television receiver 12 shown in Fig. 6 will be briefly described. A television broadcast signal input to an antenna terminal 205 is supplied to a digital tuner 206. This digital tuner 206 processes the television broadcast signal to output a predetermined transport stream corresponding to a channel selected by the user. A partial TS (TS packets of video data and TS packets of audio data) is extracted from the transport stream and supplied to an MPEG decoder 207.

[0095] In the MPEG decoder 207, a video PES packet composed of TS packets of video data is decoded to obtain video data. This video data is subjected to a scaling process (resolution conversion process), a superimposition process of graphics data, etc., as necessary in a video signal processing circuit 208 and a graphics generating circuit 209, and then supplied to a panel driving circuit 210. Therefore, an image corresponding to the channel selected by the user is displayed on the display panel 211.

[0096] Furthermore, the MPEG decoder 207 performs a decoding process on the audio PES packets composed of the TS packets of the audio data to obtain audio data. This audio data undergoes necessary processes such as D / A conversion in the audio signal processing circuit 212, and is further amplified in the audio amplifier circuit 213 before being supplied to the speaker 214. Therefore, the speaker 214 outputs audio corresponding to the channel selected by the user.

[0097] Furthermore, content data (image data, audio data) supplied from the network terminal 225 to the Ethernet interface 224, or supplied from the HDMI terminal 12a via the high-speed bus interface 12c, is supplied to the MPEG decoder 207. After this, the operation is the same as when receiving the above-mentioned television broadcast signal, and an image is displayed on the display panel 211 and audio is output from the speaker 214.

[0098] Furthermore, the HDMI receiving unit 12b acquires image data and audio data transmitted from the disc player 11 connected to the HDMI terminal 12a via the HDMI cable 13. The image data is supplied to the video signal processing circuit 208 via the HDR processing circuit 204. Furthermore, the audio data is directly supplied to the audio signal processing circuit 212. After this, the operation is the same as when receiving the above-mentioned television broadcast signal, and an image is displayed on the display panel 211 and audio is output from the speaker 214.

[0099] When the image data received by the HDMI receiving unit 12b is HDR image data, the HDR processing circuit 204 performs processing (decoding processing) corresponding to the transmission method on the HDR image data, and generates HDR image data. Then, the HDR image data is supplied from the HDR processing circuit 204 to the video signal processing unit 208. When HDR image data is supplied, the video signal processing circuit 208 generates image data for displaying an HDR image based on the HDR image data, and performs gamma correction based on the gamma correction information received by the HDMI receiving unit 12b. Therefore, the HDR image is displayed on the display panel 211.

[0100] [HDR image data transmission method] Next, a transmission method of HDR image data will be described. First, a case where the HDR image data of the original signal is composed of image data of 8 bits or more will be described. Here, as shown in Figs. 7 to 9, a case where the HDR image data is image data in a pixel format of 1920 x 1080p will be described as an example.

[0101] When transmitting this original signal through a baseband digital interface, the following three transmission methods are possible. These methods are the most desirable methods because they allow transmission without degrading the quality of the original signal. However, they require a transmission bandwidth that is 1.2 times or more the bandwidth of 1920x1080p 8-bit pixel format image data, so they are only possible when there is sufficient transmission bandwidth.

[0102] Transmission method (1) is a method of transmission using a deep color transmission format, as shown in Fig. 7. In this case, a pixel format of 1920x1080p is selected as the image format, and the image is transmitted together with information specifying the number of bits per pixel, either "DC-48bit", "DC-36bit", or "DC-30bit" (to be described later), and newly defined HDR transmission method information. In this case, pixel mapping processing is required in the HDR processing circuit 114 or the HDMI transmission unit 11b, since all pixel data cannot be transmitted with one pixel clock.

[0103] Transmission method (2) is a method in which the lower 8 bits of HDR image data are arranged in the left eye image data area of ​​a stereoscopic video format, and the remaining upper bits of the HDR image data are arranged in the right eye image data area of ​​the stereoscopic video format, as shown in Fig. 8. In this case, a video format called 1920 x 1080p frame packing is specified as the video format, and the stereoscopic video format is not specified, and the data is transmitted together with newly defined HDR transmission method information. In this case, the HDR processing circuit 114 needs to perform slicing processing of the lower 8 bits of image data and the upper bits of image data and bit mapping processing to a predetermined stereoscopic video format.

[0104] In the above, it has been described that the remaining upper bits of the HDR image data are arranged in the right eye image data area of ​​the stereoscopic video format and transmitted. That is, when the HDR image data is 10-bit, 12-bit, or 16-bit image data, the remaining upper bits of the HDR image data are 2 bits, 4 bits, or 8 bits, respectively. Instead of the remaining upper bits, it is also possible to arrange the upper 8 bits of the HDR image data in the right eye image data area of ​​the stereoscopic video format and transmit it.

[0105] Also, in the above description, the lower 8 bits of HDR image data are arranged in the left eye image data area of ​​the stereoscopic video format, and the remaining upper bits of HDR image data are arranged in the right eye image data area of ​​the stereoscopic video format for transmission. However, it is also conceivable to arrange the lower 8 bits of HDR image data in the right eye image data area of ​​the stereoscopic video format, and the remaining upper bits of HDR image data in the left eye image data area of ​​the stereoscopic video format for transmission.

[0106] Also, in the above description, the lower 8 bits of HDR image data are arranged in the left eye image data area of ​​the stereoscopic video format, and the remaining upper bits of HDR image data are arranged in the right eye image data area of ​​the stereoscopic video format for transmission. However, it is also conceivable to arrange the upper 8 bits of HDR image data in the left eye image data area of ​​the stereoscopic video format, and the remaining lower bits of HDR image data in the right eye image data area of ​​the stereoscopic video format for transmission.

[0107] Transmission method (3) is a method in which the lower 8 bits of HDR image data are arranged in a first frame image data area of ​​a high frame rate, and the remaining upper bits of the HDR image data are arranged in a second frame image data area for transmission, as shown in Fig. 9. In this case, a normal 1920x1080p high frame rate video format is specified as the video format, and transmitted together with newly defined HDR transmission method information. In this case, the HDR processing circuit 114 needs to perform slicing processing of the lower 8 bits of image data and the upper bits of image data, and bit mapping processing to a predetermined high frame rate video format.

[0108] In the above, it has been described that the remaining upper bits of the HDR image data are arranged in the second frame image data area and transmitted. That is, when the HDR image data is 10-bit, 12-bit, or 16-bit image data, the remaining upper bits of the HDR image data are 2 bits, 4 bits, or 8 bits, respectively. Instead of the remaining upper bits, it is also possible to arrange the upper 8 bits of the HDR image data in the second frame image data area and transmit it.

[0109] Also, in the above description, the lower 8 bits of HDR image data are arranged in the first frame image data area of ​​the high frame rate, and the remaining upper bits of the HDR image data are arranged in the second frame image data area for transmission. However, it is also possible to arrange the lower 8 bits of DR image data in the second frame image data area of ​​the high frame rate, and the remaining upper bits of HDR image data in the first frame image data area for transmission.

[0110] Also, in the above description, the lower 8 bits of HDR image data are arranged in the first frame image data area of ​​the high frame rate, and the remaining upper bits of the HDR image data are arranged in the second frame image data area for transmission. However, it is also possible to arrange the upper 8 bits of HDR image data in the first frame image data area of ​​the high frame rate, and the remaining lower bits of the HDR image data in the second frame image data area for transmission.

[0111] In the case of transmission methods (2) and (3), the HDR processing circuit 204 of the above-mentioned television receiver 12 performs processing to separate and extract the lower 8 bits and upper bits, or the upper 8 bits and lower bits, of the HDR image data from the stereoscopic video format or the high frame rate video format, respectively.

[0112] [Gamma correction method for HDR image data] Next, a gamma correction method for HDR image data will be described.

[0113] As shown in FIG. 10, gamma correction method (1) can approximate a gamma correction curve by specifying the expected luminance level of the display panel 211 at 100% luminance, the maximum luminance level of the HDR image to be transmitted, the bit value of image data representing 0% luminance, the bit value of image data representing 100% luminance, and the bit value of image data representing the maximum white level expressed in the HDR image, and the expected HDR image can be displayed by performing image correction based on this approximation curve.

[0114] As shown in FIG. 11, gamma correction method (2) can approximate a gamma correction curve by specifying the expected output luminance level of the display panel 211 at a specified luminance input level, the luminance dynamic range value of the HDR image to be transmitted, and the maximum luminance level, and can display the expected HDR image by performing image correction based on this approximation curve.

[0115] As shown in FIG. 12, gamma correction method (3) can approximate a gamma correction curve by specifying the luminance level at 100% luminance and the luminance level at 0% luminance defined in ITU-R BT.1886, and the gamma value, and by performing image correction based on this approximation curve, the expected HDR image can be displayed.

[0116] [EDID data structure example] Figure 13 shows an example of the data structure of an E-EDID. This E-EDID consists of a basic block and an extended block. At the beginning of the basic block, data defined in the E-EDID1.3 standard, represented as "E-EDID1.3 Basic Structure", is placed, followed by timing information for maintaining compatibility with conventional EDID, represented as "Preferred timing", and timing information different from "Preferred timing" for maintaining compatibility with conventional EDID, represented as "2nd timing".

[0117] In addition, in the basic block, following "2nd timing", information indicating the name of the display device represented by "Monitor NAME" and information indicating the number of pixels that can be displayed when the aspect ratio is 4:3 and 16:9 represented by "Monitor Range Limits" are arranged in that order.

[0118] At the beginning of the extended block, there are data represented by a “Short Video Descriptor” describing information such as the displayable image size (resolution), frame rate, information indicating whether it is interlaced or progressive, and aspect ratio; data represented by a “Short Audio Descriptor” describing information such as the playable audio codec method, sampling frequency, cutoff band, and codec bit number; and information regarding the left and right speakers represented by “Speaker Allocation”.

[0119] In addition, following "Speaker Allocation", the extended block contains data that is uniquely defined for each manufacturer, represented by "Vender Specific", timing information for maintaining compatibility with conventional EDID, represented by "3rd timing", and timing information for maintaining compatibility with conventional EDID, represented by "4th timing".

[0120] [Example of data structure in the Vendor Specific Data Block (VSDB) area] In this embodiment, a data area is defined in the VSDB area to be expanded in order to store HDR image information. Fig. 14 shows an example of the data structure of the VSDB area. The VSDB area includes 0th block to Nth block, which are 1-byte blocks.

[0121] The data area of ​​the HDR image information to be stored by the sink device (in this embodiment, the television receiver 12) is defined in the fourth bit of the eighth byte and in the M+1 to M+3 bytes following the already defined 0th to Mth bytes.

[0122] First, the 0th byte to the 8th byte will be described. The 0th byte, which is placed at the beginning of the data represented by "Vender Specific", contains a header indicating a data area represented by "Vendor-Specific tag code (=3)", and information indicating the length of the VSDB data represented by "Length (=N)". In addition, the 1st to 3rd bytes contain information indicating the number "0x000C03", which is registered for HDMI(R) and is represented by "24-bit IEEE Registration Identifier (0x000C03) LSB first".

[0123] Furthermore, the fourth and fifth bytes contain information indicating a 24-bit physical address of the sink device, represented by "A", "B", "C", and "D", respectively. The sixth byte contains a flag indicating the functions supported by the sink device, represented by "Supports-AI", information specifying the number of bits per pixel, represented by "DC-48bit", "DC-36bit", and "DC-30bit", respectively, a flag indicating whether the sink device supports YCbCr4:4:4 image transmission, represented by "DC-Y444", and a flag indicating whether the sink device supports dual DVI (Digital Visual Interface), represented by "DVI-Dual".

[0124] Additionally, the seventh byte contains information indicating the maximum frequency of the TMDS pixel clock, represented by "Max-TMDS-Clock". The eighth byte contains flags for specifying the presence of a latency field, an interlace latency field, a 3D video format extension, and content type (CNC) function support. A new flag indicating whether HDR information supported by the sink device is present is placed in the fourth bit of the eighth byte. If this flag is True, it indicates that information related to HDR is present in the 15+M bytes to 18+M bytes.

[0125] Next, the 15+M bytes to the 18+M bytes will be described. The 7th bit of the 15+M byte indicates whether or not the source device prohibits processing related to the HDR function. The 6th to 4th bits of the 15+M byte contain data indicating the three video formats of HDR images (the above-mentioned transmission methods (1) to (3)) supported by the sink device.

[0126] Bits 3 to 0 of the 15+M byte can be allocated if a method other than these is proposed. Bits 7 to 5 of the 16+M byte contain data indicating three gamma correction methods for HDR images supported by the sink device. Bits 4 to 0 of the 16+M byte can be allocated if a gamma correction method other than these is proposed.

[0127] For example, when the 7th bit is True, the source device prohibits processing such as luminance expansion and bit compression of HDR images. The 17+M byte specifies the maximum luminance value of the display panel unit 211 of the sink device in units of cd / m2. The 18+M byte specifies the maximum luminance expansion level that can be processed by the video signal processing circuit 208 of the sink device in units of %. These are used as sink device information required for luminance expansion and bit compression processing of HDR images performed by the source device when "Raw" in the 7th bit of the 15+M byte is False.

[0128] Here, we propose a method of storing HDR transmission information using the VSDB area, but since the data structure of E-EDID can also be realized using other data areas, such as VCDB (Video Capability Data Block), we are not limited to this method.

[0129] In the AV system 10 shown in Fig. 1, the CPU 104 of the disc player (source device) 11 checks the connection of the television receiver (sink device) 12 via the HPD line (see Fig. 2). After that, the CPU 104 of the disc player 11 reads the E-EDID, and therefore the HDR image information, from the television receiver 12 using the DDC 23 (see Fig. 2), and recognizes the transmission method of the HDR image supported by the television receiver 12.

[0130] 1, when transmitting HDR image data to the television receiver 12, the disc player 11 selects and transmits one of the transmission methods and gamma correction methods for HDR image data that the television receiver 12 can support, based on the HDR image information read from the television receiver 12 as described above. At that time, the disc player 11 transmits information about the HDR image format currently being transmitted to the television receiver 12.

[0131] In this case, the disc player 11 transmits the information to the television receiver 12 by inserting the information into a blanking period of the HDR image data (video signal) to be transmitted to the television receiver 12. Here, the disc player 11 inserts information about the currently transmitted image format into a blanking period of the HDR image data, for example, by using an HDMI Vendor Specific InfoFrame (hereinafter, referred to as "VSIF") packet or the like. The VSIF packet is placed in the above-mentioned data island section 18 (see FIG. 3).

[0132] [Example of VSIF packet data structure] Fig. 15 shows an example of the data structure of a VSIF packet. In HDMI, this VSIF packet makes it possible to transmit additional information about an image from a source device to a sink device. The 0th byte defines the data checksum. In the 1st to 3rd bytes, information indicating the number "0x000C03", which is registered for HDMI(R) and is represented as "24-bit IEEE Registration Identifier (0x000C03) LSB first", is placed.

[0133] The seventh bit of the fourth byte specifies a flag indicating whether or not 3D data is present in the fifth through seventh+N bytes following the fourth byte. The following sixth bit specifies an "HDR_Format" flag indicating whether or not transmission information for HDR image data is present in the eighth+N bytes and beyond. If this "HDR_Format" flag is False, it indicates that HDR image data is not being transmitted. If the "HDR_Format" flag is True, additional information related to HDR images is specified in the eighth+N through eleventh+M+N bytes.

[0134] The 7th bit of the 8+Nth byte specifies information on whether the HDR image being transmitted has undergone processing such as luminance expansion or luminance compression in the source device. If "Raw" is True, it indicates that processing such as luminance expansion has not been performed in the source device. If "Raw" is False, it indicates that processing such as luminance expansion has been performed in the source device.

[0135] The following 6th to 4th bits specify information on which of the three transmission methods (video formats) for HDR images (the above-mentioned transmission methods (1) to (3)) has been selected. In this case, the 6th to 4th bits are set to 0b001 for transmission method (1), 0b010 for transmission method (2), and 0b011 for transmission method (3). The 6th to 4th bits, 0b100 to 0b111, and the 3rd to 0th bits can be assigned if a method other than these is proposed.

[0136] The 7th to 4th bits of the 9+Nth byte specify information on which of the three gamma correction methods (gamma correction methods (1) to (3) described above) for HDR images is selected. In this case, the 7th to 4th bits are set to 0b0001 for gamma correction method (1), 0b0010 for gamma correction method (2), and 0b0011 for gamma correction method (3). The 7th to 5th bits, 0b0100 to 0b1111, and the 4th to 0th bits can be assigned when a method other than these is proposed. The 10+Nth byte specifies the byte length (M) of the data of the gamma correction method specified in the 11+Nth and subsequent bytes.

[0137] Fig. 16 shows the data structure of gamma correction for gamma correction method (1) (see Fig. 10). The 10+N byte specifies data length 9 for gamma correction method (1). The 11+N to 12+N bytes specify the luminance level "Reference_Screen_Luminance_White" of the display panel 211 assumed at 100% luminance in cd / m2. The 13+N to 14+N bytes specify the maximum luminance level "Extended_Range_White_Level" of the transmitted HDR image in %.

[0138] The 15+N byte specifies the "Nominal_Black_Level_Code_Value", a bit value of the image data that represents a brightness level of 0%. Normally, it is one byte long to specify a value from 0 to 64. The 16+N to 17+N bytes specify the "Nominal_White_Level_Code_Value", a bit value of the image data that represents a brightness level of 100%. The 18+N to 19+N bytes specify the "Extended_White_Level_Code_Value", a bit value of the image data that represents the maximum white level expressed in an HDR image.

[0139] 10 shows an example of the values ​​of the HDR information (1) transmitted in the VSIF packet, that is, the above-mentioned "Extended_Range_White_Level", "Nominal_Black_Level_Code_Value", "Nominal_White_Level_Code_Value", and "Extended_White_Level_Code_Value". This example is an example in which "Extended_Range_White_Level" is "400" and the bit length is 10 bits.

[0140] Figure 17 shows the data structure of gamma correction for gamma correction method (2). The 10+N byte specifies the data length of 13 for gamma method (2). The 11+N to 12+N bytes specify the input luminance level "Input_Knee_Point" for method (2) in units of 0.1%. The 13+N to 14+N bytes specify the output luminance level "Output_Knee_Point" in units of 0.1%.

[0141] The 15+N to 18+N bytes specify the dynamic range of the HDR image to be transmitted, "Dynamic_Range," in units of 0.1%. The 19+N to 22+N bytes specify the luminance level at the maximum dynamic range, "Dynamic_Range_Luminance," in units of cd / m2.

[0142] 11 above shows an example of HDR information (2) transmitted in a VSIF packet, that is, the values ​​of the above-mentioned "Input_Knee_Point", "Output_Knee_Point", "Dynamic_Range", and "Dynamic_Range_Luminance". Here, the data structure of one set of "Knee_Point" is shown, but it is also possible to approximate a more precise curve using data of multiple "Knee_Point".

[0143] FIG. 18 shows the data structure of gamma correction for gamma method (3). The 10+N byte specifies data length 4 for gamma correction method (3). The 11+N to 12+N bytes specify the luminance level at 100% luminance, "Screen_Luminance_White_Level", in units of cd / m2. The 13+N byte specifies the luminance level at 0% luminance, "Screen_Luminance_Black_Level", in units of cd / m2. Normally, it is 1 byte long to specify a value from 0 to 64. The 14+N byte specifies the gamma value, "Gamat_Value".

[0144] FIG. 12 above shows an example of a calculation formula using the HDR information (3) transmitted in the VSIF packet, that is, the above-mentioned “Screen_Luminance_White_Level”, “Screen_Luminance_Black_Level”, and “Gamat_Value”.

[0145] The sink device (in this embodiment, the television receiver 12) can determine that HDR image data is being transmitted when any of the sixth to fourth bits of the 8+Nth byte is set to True. Furthermore, the sink device can determine the transmission method (video format) depending on which of the sixth to fourth bits is set to True.

[0146] That is, when the 6th to 4th bits are set to 0b001, it is understood that the HDR image data is transmitted using a video format called 1920x1080p Deep Color (see FIG. 7). When the 6th to 4th bits are set to 0b010, it is understood that the HDR image data is transmitted using a stereoscopic video format called 1920x1080p Frame Packing (see FIG. 8). When the 6th to 4th bits are set to 0b011, it is understood that the HDR image data is transmitted using a high frame rate video format of 1920x1080p (see FIG. 9).

[0147] Also, the gamma correction method of the HDR image can be determined by the value of the 7th to 4th bits of the 9th+Nth byte. That is, when the 7th to 4th bits are set to 0b0001, it can be seen that the HDR image data is transmitted using gamma correction method (1) (see FIG. 10). When the 7th to 4th bits are set to 0b0010, it can be seen that the HDR image data is transmitted using gamma correction method (2) (see FIG. 11). When the 7th to 4th bits are set to 0b0011, it can be seen that the HDR image data is transmitted using gamma correction method (3) (see FIG. 12).

[0148] Although a method of transmitting HDR transmission information using VSIF packets is proposed here, other data packets such as AV (Auxiliary Video) InfoFrame can also be used, and the present invention is not limited to this method. However, when transmitting HDR-related information from the television receiver (sink device) 12 to the disc player (source device) 11 using the VSDB area of ​​the E-EDID data area, it is desirable to transmit the HDR-related information from the disc player 11 using VSIF packets.

[0149] [Example of source device processing when connecting a device] Next, a process performed when the television receiver (sink device) 12 is connected to the disc player (source device) 11 in the AV system 10 shown in FIG. 1 will be described with reference to the flowchart of FIG.

[0150] The disc player 11 starts processing in step ST1, and then proceeds to processing in step ST2. In this step ST2, the disc player 11 determines whether or not the HPD signal is at high level "H". When the HPD signal is not at high level "H", the television receiver (sink device) 12 is not connected to the disc player 11. In this case, the disc player 11 immediately proceeds to step ST8 and ends the processing.

[0151] When the HPD signal is at high level "H", the disc player 11 reads the E-EDID of the television receiver 12 in step ST3. Then, the disc player 11 determines whether or not there is HDR image information (HRD data) in step ST4. If there is no HDR image information, the disc player 11 sets data indicating non-transmission of HDR images in the VSIF packet in step ST7, and then proceeds to step ST8 to end the process. Here, setting data indicating non-transmission of HDR images means setting the sixth bit of the fourth byte of the VSIF packet (see FIG. 15) to low level "L".

[0152] Also, when there is HDR image information in step ST4, the disc player 11 determines the transmission method and gamma correction method of the HDR image data in step ST5. Then, in step ST6, the disc player 11 sets data indicating the transmission method and gamma correction method of the HDR image data in the VSIF packet, and then proceeds to step ST8 and ends the process.

[0153] [Example of HDR transmission method selection process on source device] Next, the process of determining the transmission method of HDR image data in the disc player (source device) 11 in the AV system 10 shown in FIG. 1 (the process of step ST5 in FIG. 19) will be described with reference to the flowcharts in FIGS. 20 and 21.

[0154] The disc player 11 starts processing in step ST11, and then proceeds to processing in step ST12. In this step ST12, the disc player 11 determines whether or not the fourth bit of the eighth byte of the VSDB area of ​​the television receiver (sink device) 12 is at high level "H". When the fourth bit of the eighth byte is not at high level "H", the disc player 11 sets data indicating non-transmission of an HDR image in the VSIF packet in step ST13, and then proceeds to step ST27 and ends the processing. Here, setting data indicating non-transmission of an HDR image means setting the sixth bit of the fourth byte of the VSIF packet (see FIG. 12) to "L".

[0155] When the fourth bit of the eighth byte is at high level "H" in step ST12, the disc player 11 proceeds to the process of step ST14. In this step ST14, the disc player 11 determines whether or not the seventh bit of the 15+Mth byte of the VSDB area of ​​the television receiver 12 is at high level "H". When the seventh bit of the 15+Mth byte is not at high level "H", the disc player 11 reads the 17+Mth byte and the 18+Mth byte of the VSDB area in step ST15, and proceeds to the next step ST16.

[0156] In step ST16, the disc player 11 performs luminance compression processing of the HDR image to be transmitted based on the read data of the maximum luminance (cd / m2) of the display panel 211 in the 17+M byte and the maximum luminance expansion level (%) in the 18+M byte, and proceeds to the next step ST17. In this step ST17, the disc player 11 sets data indicating the implementation of luminance compression processing of the HDR image and gamma correction information in the VSIF packet, and then proceeds to step ST27 and ends the process. Here, setting data indicating the implementation of luminance compression of the HDR image means setting the 7th bit of the 8+Nth byte of the VSIF packet (see FIG. 15) to "False = L".

[0157] Furthermore, when the 7th bit of the 15+M byte is at high level "H" in step ST14, the disc player 11 does not perform luminance compression processing of the HDR image in step ST18, and proceeds to the next step 19. In this step ST19, the disc player 11 determines whether the 6th bit of the 15+M byte in the VSDB area is set to high level "H".

[0158] When the 6th bit of the 15+M byte is at high level "H", the disc player 11 selects the HDR image transmission method (1) in step ST20 and proceeds to the next step 21. In this step ST21, the disc player 11 sets data indicating the HDR image transmission method (1) in the VSIF packet, and then proceeds to step ST26-1. Here, setting the data indicating the HDR image transmission method (1) means setting the 6th bit to the 4th bit of the 8+N byte of the VSIF packet (see FIG. 15) to "0b001".

[0159] Also, when the 6th bit of the 15+Mth byte is at low level "L" in step ST19, the process proceeds to the next step ST22. In this step ST22, the disc player 11 determines whether the 5th bit of the 15+Mth byte of the VSDB area is set to high level "H". When the 5th bit of the 15+Mth byte is at high level "H", the disc player 11 selects the HDR image transmission method (2) in step ST23 and proceeds to the next step ST24.

[0160] In step ST24, the disc player 11 sets data indicating the transmission method (2) of the HDR image in the VSIF packet, and then proceeds to step ST26-1. Here, setting the data indicating the transmission method (2) of the HDR image means setting the 6th bit to the 4th bit of the 8+Nth byte of the VSIF packet (see FIG. 15) to "0b010."

[0161] Furthermore, when the 5th bit of the 15+M byte is not at high level "H" in step ST22, the disc player 11 selects the HDR image transmission method (3) in step ST25, and proceeds to the next step ST26. In this step ST26, the disc player 11 sets data indicating the HDR image transmission method (3) in the VSIF packet, and then proceeds to step ST26-1. Here, setting the data indicating the HDR image transmission method (3) means setting the 6th bit to the 4th bit of the 8+N byte of the VSIF packet (see FIG. 15) to "0b011."

[0162] In step ST26-1, the disc player 11 judges whether or not the 6th bit of the 16+M byte of the VSDB packet is at high level "H". If the 6th bit of the 16+M byte is at high level "H", in step ST26-2, the disc player 11 sets the 7th to 4th bits of the 9+N byte of the VSIF area to "0b0010", sets the data of the gamma correction method (2) in the 10+N to 22+N bytes, proceeds to step ST27, and ends the process.

[0163] Also, in step ST26-1, when the 6th bit of the 16+M byte of the VSDB packet is not at high level "H", the disc player 11 proceeds to step ST26-3. In this step ST26-3, the disc player 11 judges whether or not the 7th bit of the 16+M byte of the VSDB packet is at high level "H". When the 7th bit of the 16+M byte is at high level "H", in step ST26-4, the disc player 11 sets the 7th bit to the 4th bit of the 9+N byte of the VSIF area to "0b0001", sets the data of the gamma correction method (1) in the 10+N byte to the 19+N byte, proceeds to step ST27, and ends the process.

[0164] Also, in step ST26-3, when the 7th bit of the 16+M byte is not at high level "H", the disc player 11 proceeds to step ST26-5. In this step ST26-5, the disc player 11 judges whether or not the 5th bit of the 16+M byte of the VSDB packet is at high level "H". When the 5th bit of the 16+M byte is at high level "H", in step ST26-6, the disc player 11 sets the 7th bit to the 4th bit of the 9+N byte of the VSIF area to "0b0011", sets the data of the gamma correction method (3) in the 10+N byte to the 14+N byte, proceeds to step ST27, and ends the process.

[0165] Also, in step ST26-5, if the 5th bit of the 16+Mth byte of the VSDB packet is not at high level "H", the disc player 11 proceeds to step ST26-7, where the 7th to 4th bits of the 9+Nth byte of the VSIF area are set to "0b0000", the 10+Nth byte is set to "L", and the process proceeds to step ST27, where the process ends.

[0166] [Example of processing when the sink device is set to power saving mode] Next, processing in the television receiver (sink device) 12 when the power saving mode is set in the AV system 10 shown in Fig. 1 will be described with reference to the flowchart of Fig. 22. The television receiver 12 starts processing in step ST30, and then proceeds to processing in step ST31. In this step ST31, the television receiver 12 determines whether or not its own operation mode is set to the power saving mode.

[0167] When the energy saving mode is set, the user selects an operation for reducing power consumption by displaying an image with reduced luminance of the display panel 211, and therefore, from the viewpoint of energy saving, it is undesirable to perform HDR luminance expansion more than necessary. Therefore, when the energy saving mode is set, the television receiver 12 proceeds to the process of step ST32.

[0168] In this step ST32, the television receiver 12 sets the 7th bit of the 15+M byte in the VSDB area of ​​its own E-EDID to "False = L". In addition, in this step ST32, the television receiver 12 further sets the values ​​of the maximum brightness level of the display panel 211 in the 17+M byte and the maximum brightness range in the 18+M byte to the brightness level and maximum brightness range values ​​that are set in energy saving mode. After that, the television receiver 12 proceeds to step ST34 and ends the processing.

[0169] If the energy saving mode is not set in step ST31, the television receiver 12 proceeds to the process of step ST33. In this step ST33, the television receiver 12 sets the 7th bit of the 15+M byte in the VSDB area of ​​its own E-EDID to "True = "H". In addition, in this step ST33, the television receiver 12 further sets the value of the maximum brightness level of the display panel 211 in the 17+M byte and the maximum brightness range in the 18+M byte to its own maximum values. After that, the television receiver 12 proceeds to step ST34 and ends the process.

[0170] [Example of how to turn off energy saving mode on a sink device] Next, the processing performed in the AV system 10 shown in FIG. 1 when the television receiver (sink device) 12 starts transmitting an HDR image from the disc player (source device) 11 in the power saving mode will be described with reference to the flowchart in FIG. 23.

[0171] The television receiver 12 starts the process in step ST40, and then proceeds to the process in step ST41. In this step ST41, the television receiver 12 determines whether or not the sixth bit of the fourth byte of the VSIF packet (see FIG. 15) transmitted from the disc player 11 is set to high level "H". If the sixth bit of the fourth byte is not set to high level "H", it is determined that the transmission is not an HDR image, the energy saving mode is not released, and then the process proceeds to step ST47 and ends.

[0172] If the sixth bit of the fourth byte is set to high level "H" in step ST41, the television receiver 12 proceeds to the next step ST42. In this step ST42, the television receiver 12 determines whether or not the television receiver 12 is set to an energy saving mode. If the television receiver 12 is not set to the energy saving mode, the television receiver 12 determines that it is possible to receive HDR images and does not enter the energy saving mode, and then proceeds to step ST47 and ends the process.

[0173] If the energy saving mode is set in step ST42, the television receiver 12 proceeds to the next step ST43. In this step ST43, the television receiver 12 displays a selection screen on the display panel 211 for the user to instruct whether or not to cancel the energy saving mode and receive HDR images, notifies the user, waits for the user's selection, and proceeds to the next step ST44.

[0174] In step ST44, the television receiver 12 determines whether or not the user has instructed to select to cancel the energy saving mode and receive HDR images. If the user does not wish to cancel the energy saving mode, the energy saving mode is not canceled, and the process then proceeds to step ST47 to end the process.

[0175] If the user wishes to cancel the energy saving mode in step ST44, the television receiver 12 proceeds to the next step ST45. In this step ST45, in order to cancel the energy saving mode and receive HDR images, the television receiver 12 sets the 7th bit of the 15+M byte of the VSDB area (see FIG. 14) to high level "H", sets the 17+M byte and the 18+M byte to the maximum luminance value and luminance level that can be displayed by its own display panel 211, and proceeds to the next step ST46. In this step ST46, the television receiver 12 cancels the energy saving mode, and then proceeds to step ST47 and ends the process.

[0176] 1, HDR image data is transmitted from the disc player 11 to the television receiver 12 via the HDMI cable 13, and transmission method information and gamma correction information for this HDR image data are also transmitted via the same HDMI cable 13, enabling good transmission of the HDR image data. For example, the television receiver 12 can appropriately process the received HDR image data based on the received transmission method information and gamma correction information.

[0177] 1, the disc player 11 selects a transmission method and gamma correction method for HDR image data that are compatible with the television receiver 12. Therefore, the television receiver 12 can reliably perform decoding and gamma correction processing on the received HDR image data. In other words, the HDR image data can be transmitted satisfactorily between the disc player 11 and the television receiver 12.

[0178] <2. Modifications> In the above-described embodiment, the disc player 11 transmits the transmission method information and gamma correction information of the HDR image data to the television receiver 12 by inserting the information into a blanking period of the image data (video signal) using a VSIF packet.

[0179] For example, the disc player 11 may transmit the transmission method information and gamma correction information of the HDR image data to the television receiver 12 via the CEC line 24, which is a control data line of the HDMI cable 13. In addition, for example, the disc player 11 may transmit the transmission method information and gamma correction information of the HDR image data to the television receiver 12 via a bidirectional communication path constituted by the reserve line 27 and HPD line 25 of the HDMI cable 13.

[0180] Furthermore, in the above-described embodiment, the E-EDID of the television receiver 12 includes transmission method information and gamma correction method information of the HDR image data supported by the television receiver 12, and the disc player 11 reads the E-EDID via the DDC 23 of the HDMI cable 13 to obtain the transmission method information and gamma correction method information of the HDR image data supported by the television receiver 12.

[0181] However, the disc player 11 may receive transmission method information and gamma correction method information of the HDR image data supported by the television receiver 12 from the television receiver 12 via a CEC line 24, which is a control data line of the HDMI cable 13, or via a bidirectional communication path consisting of a reserve line 27 and an HPD line 25 of the HDMI cable 13.

[0182] Also, in the above-described embodiment, an example is shown in which the disc player 11 transmits both the transmission method information and the gamma correction information of the HDR image data to the television receiver 12. However, a configuration in which only one of them is transmitted is also conceivable.

[0183] In the above-described embodiment, the HDMI transmission path is used. However, as the baseband digital interface, in addition to HDMI, there are MHL (Mobile High-definition Link), DVI (Digital Visual Interface) interface, DP (Display Port) interface, wireless interface using 60 GHz millimeter wave, etc. The present technology can be similarly applied to the case where HDR image data is transmitted by these digital interfaces.

[0184] [Example of DP system structure] 24 shows an example of the configuration of a DP system 300 using a DP interface. In this DP system 300, a DP transmitter 301 and a DP receiver 307 are connected by a DP cable 303. The DP transmitter 301 includes a DP transmitter unit 302, and the DP receiver 307 includes a DP receiver unit 308 and a memory unit 309.

[0185] DP cable 303 consists of a main link 304, an AUX channel 305, and hot plug detect 306. The main link 304 consists of one, two, or four double-terminated differential signal pairs (pair lanes) and does not have a dedicated clock signal, instead the clock is embedded in the 8B / 10B encoded data stream.

[0186] Unlike HDMI, the DP interface has an independent transmission speed and pixel frequency, and can freely adjust the pixel depth, resolution, frame frequency, and the presence and amount of additional data such as audio data and DRM information in the transfer stream. HDR image data, transmission method information for HDR image data, and gamma correction information are transmitted using the main link 304.

[0187] The transmission data structure of the DP interface uses the TMDS transmission data structure in HDMI (see Fig. 3), and the HDR image data uses the image data structures in HDMI shown in Figs. 7 to 9. Furthermore, the transmission method information and gamma correction information for the HDR image data use packets with the same data structure as the VSIF packets (see Fig. 15) that are inserted and transmitted in the control section 19 (see Fig. 3) in HDMI.

[0188] The DP transmitter 301 confirms the connection of the DP receiver 307 by hot plug detection 306. After that, the DP transmitter 301 reads the HDR image information of the E-EDID from the storage unit 309 of the DP receiver 307 using the AUX channel 305, and recognizes the transmission method of the HDR image supported by the DP receiver 307. The data structure of the HDR image information of the E-EDID of the DP receiver 307 may be the same as that in Figs. 13 and 14.

[0189] In addition to the main link 304, the DP interface also has a half-duplex, bidirectional AUX channel 305 with a bandwidth of 1 Mbit / s or 720 Mbit / s, which is used for bidirectional communication to exchange information about functions between the transmitting device and the receiving device. This AUX channel 305 can also be used to transmit HDR image data transmission method information and gamma correction method information.

[0190] [Example of data structure for AUX channel] 25(a) shows an example of a packet structure when transmitting HDR image data transmission method information and gamma correction method information on the AUX channel 305. The packet is composed of a header, a data area, and a STOP bit. The header is composed of a SYNC section for synchronization, a 4-bit command section, and a 20-bit memory address of the storage section 309. The data area is composed of an 8-bit data length section and a payload section of 8 to 128 bits or 512 bits.

[0191] The transmission method information and gamma correction method information of the HDR image data are inserted into the payload. When the transmission method information and gamma correction method information of the HDR image data are transmitted from the DP transmitter 301 to the DP receiver 307, "0b1000" is set in the command section of the header. In the payload section, data of the syntax indicated by "Metadata_tx" as shown in FIG. 25(b) is set.

[0192] "Continuation_flag" is a bit indicating continuity when dividing and transmitting multiple packets when the data length of the payload section of one packet is shorter than the transmission method information and gamma correction method information of the HDR image data to be transmitted. "Metadata_type" indicates the method selected by the DP transmitting device 301 based on the transmission method information and gamma correction method information of the HDR image data supported by the DP receiving device 307. "Metadata" sets the transmission method information and gamma correction method information of the HDR image data to be transmitted.

[0193] Furthermore, when the DP transmitting device 301 obtains the transmission method and gamma correction method information of the HDR image data supported by the DP receiving device 307, the DP transmitting device 301 sets "0b1001" in the command section of the header section. The data of the syntax indicated by "EDID_read" as shown in FIG. 25(c) is set in the payload section. The byte length of the data of the transmission method information and gamma correction method information of the HDR image data to be obtained is set in "HDR_VSDB_length". In this way, the DP system 300 can also transmit the transmission method information and gamma correction method information of the HDR image data, similar to the AV system 10 in HDMI.

[0194] [Example of MHL system structure] 26 shows an example of the configuration of an MHL system 400 using an MHL interface. In this MHL system, an MHL transmitter 401 and an MHL receiver 408 are connected by an MHL cable 404. The MHL transmitter 401 includes a TMDS transmitter 402 and a storage unit 403, and the MHL receiver 408 includes a TMDS receiver 409, a storage unit 410, and an EDID-ROM 411.

[0195] The MHL cable 404 is composed of a TMDS channel 405, a CBUS (MHL Link Control Bus) / eCBUS (enhanced MHL Link Control Bus) line 406, and a power supply VBUS (MHL Voltage Bus) line 407. The TMDS channel 405 is composed of a pair of differential signals, and transmits HDR image data, transmission method information for the HDR image data, and gamma correction information.

[0196] The transmission data structure of the MHL interface uses the TMDS transmission data structure in HDMI (see Fig. 3), and the HDR image data uses the image data structures in HDMI shown in Figs. 7 to 9. Furthermore, the transmission method information and gamma correction information for the HDR image data use packets with the same data structure as the VSIF packets (see Fig. 15) inserted and transmitted in the control section 19 (see Fig. 3) in HDMI.

[0197] 27 is set to 0x64, HPD indicates a high level "1," and when the data portion of the packet data is set to 0x65, HPD indicates a low level "0." In this way, the MHL transmitter 401 confirms the connection of the MHL receiver 408 via the CBUS / eCBUS line 406.

[0198] Thereafter, the MHL transmitter 401 reads the HDR image information of the E-EDID from the MHL receiver 408 using the CBUS / eCBUS line 406, and recognizes the transmission method of the HDR image supported by the MHL receiver 408. The data structure of the HDR image information of the E-EDID of the MHL receiver 408 may be the same as that in FIGS. 13 and 14.

[0199] [Example of CBUS line data structure] FIG. 28(a) shows the CBUS packet format when transmitting HDR image data transmission method information and gamma correction information on the CBUS / eCBUS line 406. Normally, packets transmitted on the CBUS / eCBUS line 406 transmit 1-byte-long data by time division multiplexing, so delays occur when transmitting long data such as HDR image data transmission method information and gamma correction information, making it unsuitable for data transmission that requires real-time performance. Therefore, the "Block Protocol" of eMSC (enhanced MHL-Specific Communication), which can transmit data up to 256 bytes long in blocks, is used. This packet is composed of a 2-byte request command section (0xFF), a response waiting NULL section, a START section, a 256-byte payload section, a 2-byte CRC section, and a response waiting NULL section.

[0200] The transmission method information and gamma correction information of the HDR image data are inserted into a 256-byte payload section. The payload section is set with data of the syntax indicated by "Metadata_tx" as shown in FIG. 28(b). "Metadata_type" indicates the method selected by the MHL transmitter 401 based on the transmission method information and gamma correction method information of the HDR image data supported by the MHL receiver 408. "Metadata" sets the transmission method information and gamma correction method information of the HDR image data to be transmitted. In this way, the MHL system 400 can also transmit the transmission method information and gamma correction method information of the HDR image data, similar to the AV system 10 in HDMI.

[0201] In addition, in the above-described embodiment, an example was given in which a disc player 11 was used as a transmitting device (source device) and a television receiver 12 was used as a receiving device (sink device), but it goes without saying that the present technology can be similarly applied to devices using other transmitting devices and receiving devices.

[0202] The present technology can also be configured as follows. (1) a data transmission unit that transmits high dynamic range image data to an external device via a transmission path; an information transmission unit that transmits transmission method information and / or gamma correction information of the high dynamic range image data transmitted by the data transmission unit to the external device via the transmission path. Transmitting device. (2) The data transmission unit transmits the high dynamic range image data to the external device via the transmission path by a differential signal. The transmitting device according to (1) above. (3) The information transmitting unit transmits the transmission method information and / or gamma correction information of the high dynamic range image data transmitted by the data transmitting unit to the external device by inserting the transmission method information and / or gamma correction information of the high dynamic range image data into a blanking period of the high dynamic range image data. The transmitting device according to (2) above. (4) The information transmission unit transmits the transmission method information and / or gamma correction information of the high dynamic range image data transmitted by the data transmission unit to the external device via a control data line constituting the transmission path. The transmitting device according to (2) above. (5) The information transmission unit transmits, to the external device, transmission method information and / or gamma correction information of the high dynamic range image data transmitted by the data transmission unit via a bidirectional communication path formed using a predetermined line of the transmission path. The transmitting device according to (2) above. (6) The bidirectional communication path is a pair of differential transmission paths, at least one of which has a function of receiving a notification of a connection state from the external device by a DC bias potential. The transmitting device according to (5) above. (7) The high dynamic range image data includes first data and second data; The data transmission unit configures the first data and the second data in a video format defined for a stereoscopic image and transmits the data to the external device via the transmission path. A transmitting device according to any one of (1) to (6). (8) The high dynamic range image data includes first data and second data; The data transmission unit transmits the first data as a first frame image to the external device via the transmission path, and transmits the second data as a second frame image to the external device via the transmission path. A transmitting device according to any one of (1) to (6). (9) The high dynamic range image data includes first data and second data; The first data is the lower 8-bit data of high dynamic range image data and the second data is the upper bit data of high dynamic range image data, or the first data is the upper 8-bit data of high dynamic range image data and the second data is the lower bit data of high dynamic range image data. A transmitting device according to any one of (1) to (6). (10) The transmission method information and gamma correction information of the high dynamic range image data transmitted by the data transmission unit includes at least one of maximum white level information exceeding 100% of the high dynamic range image data, a bit value at the time of black level expression, a bit value at the time of 100% white level expression, a flag indicating whether high dynamic range processing is performed, a receiving device luminance level assumed at 100% white level, a luminance input level required for luminance expansion of the high dynamic range image, and an expanded luminance output level required for luminance expansion of the high dynamic range image. A transmitting device according to any one of (1) to (9). (11) an information receiving unit for receiving information on a transmission method and / or a gamma correction method of high dynamic range image data that is compatible with the external device, the information being transmitted from the external device via the transmission path; a method selection unit that selects a predetermined transmission method and / or gamma correction method from among the transmission methods and / or gamma correction methods for high dynamic range image data that the external device can support, based on the transmission method information and / or gamma correction method information received by the information receiving unit; The data transmission unit transmits the high dynamic range image data of the transmission method and / or the gamma correction method selected by the method selection unit to the external device via the transmission path. A transmitting device according to any one of (1) to (10). (12) a data transmitting step of transmitting the high dynamic range image data to an external device via a transmission path; an information transmitting step of transmitting transmission method information and / or gamma correction information of the high dynamic range image data transmitted in the data transmitting step to the external device via the transmission path; A method for transmitting high dynamic range image data. (13) A computer a data transmission means for transmitting the high dynamic range image data to an external device via a transmission path; an information transmitting means for transmitting transmission method information and / or gamma correction information of the high dynamic range image data transmitted by the data transmitting means to the external device via the transmission path; A program that makes it work. (14) a data receiving unit that receives high dynamic range image data for displaying a high dynamic range image from an external device via a transmission path; an information receiving unit that receives, from the external device, transmission method information and / or gamma correction information of the high dynamic range image data received by the data receiving unit; a data processing unit that processes the high dynamic range image data received by the data receiving unit based on the transmission method information and / or the gamma correction information received by the information receiving unit. Receiving device. (15) The data receiving unit receives the high dynamic range image data from the external device via the transmission path as a differential signal. The receiving device according to (14) above. (16) The information receiving unit extracts transmission method information and / or gamma correction information of the high dynamic range image data from a blanking period of the high dynamic range image data received by the data receiving unit. The receiving device according to (15) above. (17) The information receiving unit receives the transmission method information and / or gamma correction information of the high dynamic range image data received by the data receiving unit from the external device via a control data line constituting the transmission path. The receiving device according to (15) above. (18) The information receiving unit receives the transmission method information and / or gamma correction information of the high dynamic range image data received by the data receiving unit from the external device via a bidirectional communication path configured using a predetermined line of the transmission path. The receiving device according to (15) above. (19) The bidirectional communication path is a pair of differential transmission paths, at least one of which has a function of notifying the external device of a connection state by a DC bias potential. The receiving device according to (18) above. (20) The high dynamic range image data includes first data and second data; The data transmission / reception unit receives the first data and the second data, which are configured in a video format defined for stereoscopic images, from the external device via the transmission path. A receiving device according to any one of (14) to (19). (21) The high dynamic range image data includes first data and second data; The data transmission / reception unit receives the first frame image composed of the first data and the second frame image composed of the second data from the external device via the transmission path. A receiving device according to any one of (14) to (19). (22) The high dynamic range image data includes first data and second data; The first data is the lower 8-bit data of the high dynamic range image, and the second data is the upper bit data of the high dynamic range image, or the first data is the upper 8-bit data of the high dynamic range image data, and the second data is the lower bit data of the high dynamic range image data. A receiving device according to any one of (14) to (19). (23) The image processing device further includes a display control unit that, when the energy saving mode is selected and the information receiving unit receives the transmission method information of the high dynamic range image data transmitted from the external device, displays on a display unit whether or not to release the energy saving mode. A receiving device according to any one of (14) to (22). (24) an information storage unit that stores information on a transmission method and / or a gamma correction method of high dynamic range image data that the information storage unit can handle; an information transmitting unit that transmits the transmission method information and / or the gamma correction method information stored in the information storage unit to the external device via the transmission path. A receiving device according to any one of (14) to (23). (25) The information storage unit further stores at least one of maximum displayable luminance information, maximum expanded luminance level information that can be processed in a high dynamic range, and an expansion processing prohibition flag. The receiving device according to (24). (26) The information storage unit stores a decompression processing prohibition flag, The image forming apparatus further includes a storage control unit that rewrites the decompression process prohibition flag stored in the information storage unit to invalid when an energy saving mode is selected. The receiving device according to (24) or (25) above. (27) The information storage unit stores maximum luminance information that can be displayed and maximum expanded luminance level information that can be processed with a high dynamic range, The display device further includes a storage control unit that rewrites the maximum displayable luminance information and the maximum expanded luminance level information that can be processed in a high dynamic range, both of which are stored in the information storage unit, when an energy saving mode is selected. A receiving device according to any one of (24) to (26). (28) a data receiving step of receiving the high dynamic range image data from an external device via a transmission path by a data receiving unit; an information receiving step of receiving, from the external device, transmission method information and / or gamma correction information of the high dynamic range image data received in the data receiving step; and a data processing step of processing the high dynamic range image data received in the data receiving step based on the transmission method information and / or the gamma correction information received in the information receiving step. A method for receiving high dynamic range image data. (29) A computer a data receiving means for receiving high dynamic range image data for displaying a high dynamic range image from an external device via a transmission path; an information receiving means for receiving, from the external device, transmission method information and / or gamma correction information of the high dynamic range image data received by the data receiving means; a data processing means for processing the high dynamic range image data received by the data receiving means based on the transmission method information and / or the gamma correction information received by the information receiving means; A program that makes it work. [Explanation of symbols]

[0203] 10. Audio-visual system 11. Disc player 11a...HDMI terminal 11b...HDMI transmitter 11c...High-speed bus interface 12 Television receiver 12a...HDMI terminal 12b HDMI receiver 12c...High-speed bus interface 13. HDMI cable 14. Effective image area 15 Horizontal blanking interval 16 Vertical blanking interval 17 Video data section 18. Data island section 19. Control Section 21...HDMI transmitter 22...HDMI Receiver 23 DDC line 24. CEC Line 25 HPD line 26 Power line 27 Reserve Line 104···CPU 105... Internal bus 106 Flash ROM 107...SDRAM 108 Remote control receiver 109···Remote control transmitter 110··SATA interface 111...BD drive 112 Ethernet Interface 113 Network terminal 114...HDR processing circuit 115...MPEG decoder 116 Graphics Generation Circuit 117 Video output terminal 118 Audio output terminal 121 Display control unit 122 Panel drive circuit 123 Display panel 124...Power supply section 204...HDR processing circuit 205 Antenna terminal 206···Digital tuner 207 MPEG decoder 208...Video signal processing circuit 209 Graphics generation circuit 210 Panel drive circuit 211 Display panel 212 Audio signal processing circuit 213 Audio amplifier circuit 214···Speaker 220... Internal bus 221···CPU 222...Flash ROM 223...DRAM 224 Ethernet interface 225 Network terminal 226 Remote control receiver 227···Remote control transmitter 231 Display control unit 232...Power supply section 300···DP System 301···DP transmitting equipment 302 DP transmission unit 303···DP cable 304 ···Main Link 305···AUX Channel 306 Hot plug detection 307···DP receiving device 308···DP receiver 309...Storage section 400···MHL system 401···MHL transmitter 402...TMDS transmitter 403...Storage section 404···MHL cable 405···TMDS Channel 406···CBUS / eCBUS line 407...VBUS line 408···MHL receiving device 409...TMDS receiver 410...Storage section 411...EDID ROM

Claims

1. A display device, comprising: A storage unit including capability information of the display device; A panel drive circuit; A display panel, The display device receives a high dynamic range signal including high dynamic range image data from an external device via a transmission path through an interface receiving unit, and receives information in an infoframe packet regarding gamma correction for the high dynamic range image data; The interface receiving unit transmits, from the storage unit to the external device, information regarding gamma correction that the display device can process in order to display a high dynamic range image on the display panel; The storage unit is an EDID memory, and data from the storage unit includes a plurality of gamma corrections and a name of the display device. Display device.

2. The interface receiving unit includes a display port (DP) terminal. The display device according to claim 1 .

3. The infoframe packet is a VS (Vender Specific) infoframe packet. The display device according to claim 1 .

4. The infoframe packet is an AV (Auxiliary Video) infoframe packet. The display device according to claim 1 .

5. the info frame packet is arranged in a data island section allocated to a part of a horizontal blanking period and a vertical blanking period of the image data; The display device according to claim 1 .

6. High dynamic range information is transmitted in a VS (Vender Specific) infoframe packet. The display device according to claim 1 .

7. The high dynamic range image data for displaying the high dynamic range image is configured according to a deep color image format. The display device according to claim 1 .

8. the information in the infoframe packet includes an extended maximum brightness of the display device; The display device according to claim 1 .

9. the extended maximum luminance of the display device is in units of cd / m2; The display device according to claim 8.

10. The EDID data stored in the EDID memory is composed of a basic block and an extended block, The extension block includes information indicating resolution, frame rate, or whether the image is interlaced or progressive. The display device according to claim 1 .

11. A display device, comprising: A storage unit including capability information of the display device; A panel drive circuit; A display panel, The display device receives a high dynamic range signal including image data in a high dynamic range from an external device via a transmission path and an interface receiving unit, and receives information in an info frame packet; The storage unit is an EDID memory, and data from the storage unit information includes the name of the display device. Display device.

12. The interface receiving unit includes a display port (DP) terminal. The display device according to claim 11.

13. The infoframe packet is a Vender Specific (VS) infoframe packet that includes information regarding gamma correction for the high dynamic range image data. The display device according to claim 11 or 12.

14. The infoframe packet is an AV (Auxiliary Video) infoframe packet. The display device according to claim 11 or 12.

15. the info frame packet is arranged in a data island section allocated to a part of a horizontal blanking period and a vertical blanking period of the image data; The display device according to any one of claims 11 to 14.

16. High dynamic range information is transmitted in a VS (Vender Specific) infoframe packet. The display device according to any one of claims 11 to 15.

17. The high dynamic range image data for displaying the high dynamic range image is configured according to a deep color image format. The display device according to any one of claims 11 to 16.

18. the information in the infoframe packet includes an extended maximum brightness of the display device; 18. The display device according to claim 11.

19. the extended maximum luminance of the display device is in units of cd / m2; The display device according to claim 18.

20. The EDID data stored in the EDID memory is composed of a basic block and an extended block, The extension block includes information indicating resolution, frame rate, or whether the image is interlaced or progressive.

20. A display device according to claim 11.

21. 1. A method for receiving high dynamic range image data, comprising: a data receiving step in which a data receiving unit receives high dynamic range image data from an external device via a transmission line; an information receiving step of receiving information regarding gamma correction of the high dynamic range image data received in the data receiving step from an external device; a data processing step of processing the high dynamic range image data received in the data receiving step based on information regarding gamma correction received in the information receiving step; and an information storage step of storing at least one of information regarding a maximum displayable luminance and information regarding a maximum luminance expansion level capable of processing a high dynamic range, The data receiving unit includes a name of the data receiving unit in EDID that the data receiving unit transmits to the external device. Receiving method.

22. Computer, a data receiving means for receiving high dynamic range image data for displaying a high dynamic range image from an external device via a transmission path; an information receiving means for receiving information regarding gamma correction of the high dynamic range image data received by the data receiving means from the external device; a data processing means for processing the high dynamic range image data received by the data receiving means based on information regarding gamma correction received by the information receiving means; functioning as an information storage means for storing at least one of information regarding the maximum luminance that can be displayed and information regarding the maximum luminance expansion level that can process a high dynamic range; The information storage means includes a name of the information storage means in the EDID that the data receiving means transmits to the external device. program.

23. A receiving device, a data receiving unit that receives high dynamic range image data for displaying a high dynamic range image from an external device via a transmission path; an information receiving unit that receives at least one of information regarding a transmission method of high dynamic range image data and information regarding gamma correction from the external device, the information receiving unit having received the high dynamic range image data; a data processing unit that processes the high dynamic range image data received by the data receiving unit based on at least one of information related to the transmission method and information related to the gamma correction received by the information receiving unit, The receiving device includes a name of the receiving device in the EDID that the receiving device transmits to the external device. Receiving device.

24. the data receiving unit receives the high dynamic range image data from the external device via the transmission path using a differential signal; 24. Receiving device according to claim 23.

25. The information receiving unit extracts at least one of information regarding the transmission method of the high dynamic range image data and information regarding the gamma correction from a blanking period of the high dynamic range image data received by the data receiving unit.

25. Receiving device according to claim 23 or 24.

26. The information receiving unit receives at least one of information related to a transmission method of the high dynamic range image data received by the data receiving unit and information related to the gamma correction from the external device via a control data line constituting the transmission path.

25. Receiving device according to claim 24.

27. The information receiving unit receives at least one of information related to a transmission method of the high dynamic range image data received by the data receiving unit and information related to gamma correction from the external device via a bidirectional communication path consisting of a predetermined line of the transmission path.

25. Receiving device according to claim 24.

28. the bidirectional communication path is a pair of differential communication paths, At least one of the pair of differential communication paths has a function of notifying the external device of a connection state by using a DC bias potential.

28. Receiving device according to claim 27.

29. the high dynamic range image data includes first data and second data; the data receiving unit receives the first data and the second data configured in a video format defined for a stereoscopic image from the external device via the transmission path; 29. Receiving device according to any one of claims 23 to 28.

30. the high dynamic range image data includes first data and second data; the data receiving unit receives a first frame image composed of the first data and a second frame image composed of the second data from the external device via the transmission path; 29. Receiving device according to any one of claims 23 to 28.

31. the high dynamic range image data includes first data and second data, the first data being lower 8-bit data of the high dynamic range image data and the second data being upper bit data of the high dynamic range image data, or the first data being upper 8-bit data of the high dynamic range image data and the second data being lower bit data of the high dynamic range image data; 29. Receiving device according to any one of claims 23 to 28.

32. and a display control unit that, when an energy saving mode is selected, displays on a display unit whether or not to release the energy saving mode when the information receiving unit receives information regarding a transmission method of the high dynamic range image data transmitted from the external device.

24. Receiving device according to claim 23.

33. an information storage unit that stores at least one of transmission method information and gamma correction method information of high dynamic range image data that the device itself can handle; an information transmitting unit that transmits at least one of the transmission method information and the gamma correction method information stored in the information storage unit to the external device via the transmission path; The at least one piece of information is included in the EDID.

24. Receiving device according to claim 23.

34. the information storage unit further stores at least one of information on a maximum luminance that can be displayed, information on a maximum expanded luminance level that can be processed in the high dynamic range, and a flag for prohibiting the expansion process; 34. Receiving device according to claim 33.

35. the information storage unit stores a flag for prohibiting decompression processing, and a storage control unit that, when an energy saving mode is selected, rewrites a flag that prohibits the decompression process and that is stored in the information storage unit to invalid.

34. Receiving device according to claim 33.

36. the information storage unit stores information on a maximum luminance that can be displayed and information on a maximum expanded luminance level that can be processed in the high dynamic range; and a storage control unit that rewrites the information on the maximum displayable luminance and the information on the maximum expanded luminance level capable of processing the high dynamic range, both stored in the information storage unit, when an energy saving mode is selected.

34. Receiving device according to claim 33.

37. 1. A method for receiving high dynamic range image data, comprising: a data receiving step in which a data receiving unit receives the high dynamic range image data from an external device via a transmission line; an information receiving step of receiving at least one of information related to a transmission method of the high dynamic range image data received in the data receiving step and information related to gamma correction from an external device; a data processing step of processing the high dynamic range image data received in the data receiving step based on at least one of information related to the transmission method and information related to the gamma correction received in the information receiving step, The data receiving unit includes a name of the data receiving unit in EDID that the data receiving unit transmits to the external device. Receiving method

38. A non-transitory recording medium storing a program executable by a computer and an EDID including a name of a display device associated with the medium, The program is receiving high dynamic range image data for displaying a high dynamic range image from an external device via a transmission path; receiving at least one of information regarding a transmission method of the high dynamic range image data and information regarding gamma correction from the external device; and processing image data of the dynamic range based on at least one of information related to the transmission method or information related to the gamma correction; Recording medium.

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