JP4817635B2 - Image display device and image display method - Google Patents

Description

  The present invention relates to an image display apparatus and an image display method capable of selectively displaying an image based on a video signal obtained by receiving a broadcast signal and an image signal from a signal input terminal using a digital interface. It is related to mode setting.

  As is well known, the DVI (Digital Visual Interface) standard is widely used as a standard for transmitting digital video signals. In recent years, the HDMI (High Definition Multimedia Interface) standard has been adopted as a digital signal transmission standard that further improves the DVI standard.

  In the HDMI standard, for example, it is possible to multiplex a digital audio signal during the blanking period of the digital video signal and perform audio transmission. In addition to the R, G, and B formats, the digital video signal can have a color difference (Y , Cb, Cr) format, a USB (Universal Serial Bus) -like small HDMI connector can be connected, and so on. Yes.

  Therefore, recently, some television signal receivers are provided with an HDMI input terminal, and a digital signal compliant with the HDMI standard can be supplied to the input terminal from an external device. Examples of such an external device include a DVD (Digital Versatile Disk) player and a set top box (STB), and such an external device and a television signal receiver are connected via an HDMI connector. I have to.

  The HDMI standard transmission signal also includes display related information such as aspect information, and by extracting and using the related information, a display mode, for example, an image displayed on a television signal receiver is displayed. The aspect can be automatically set according to the extracted aspect information. However, the automatically set display mode does not always match the mode desired by the user, and there is room for further improvement in reproducing a video / audio signal compliant with the HDMI standard.

Patent Document 1 discloses a configuration in which the source device side is controlled from the sink device side in a system compliant with the DVI standard. In the digital transmission system compliant with the HDMI standard, the display mode on the receiving side is disclosed. There is no description about dealing with the above according to the user's preference.
JP 2002-314970 A

  When a signal transmitted according to the HDMI standard as described above is received and an image is displayed, the display mode can be automatically set based on display related information extracted from the transmitted signal. The display mode does not necessarily match the desired one, and there is room for further improvement in reproducing video / audio signals compliant with the HDMI standard.

  SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide an image display apparatus and an image display method capable of automatically setting a display mode, and enabling image reproduction that emphasizes user preferences.

The present invention is an image display device for solving such problems, and includes an HDMI connector to which a digital transmission bus compliant with the HDMI standard is connected, and a digital signal received via the HDMI connector. An HDMI signal processing unit that decodes the video signal, restores and outputs the first video signal, and extracts and outputs the aspect information when the received digital signal includes the aspect information; A broadcast signal processing unit that outputs a second video signal including a video signal obtained by receiving and processing the received broadcast signal, and any one of the first video signal and the second video signal to be input , A display for displaying an image based on the video signal selected and output by the selector, and the first to the display A selection instruction unit for selecting and instructing an image display mode based on an image signal or the second video signal, a video signal output from the selector, the first video signal being output from the selector, and the aspect information When the image display mode on the display is set in response to the aspect information, and the selection instruction unit selects the image display mode when the image display mode is set according to the setting. The first video signal selected by the selector is set to be displayed on the display in the image display mode instructed to be selected, and the aspect information is included in the first video signal after that. A control unit configured to set the image display mode instructed to be displayed on the display with priority .

In addition, the present invention is an image display method for solving the above-described problems, in which a video signal is decoded from a digital signal received via a digital transmission bus compliant with the HDMI standard, A step of restoring and outputting the first video signal, extracting the aspect information when the received digital signal includes aspect information, and a video signal including a video signal obtained by receiving the received broadcast signal. A video signal output step, a step of outputting one of the first video signal and the second video signal to be input, and an image based on the output video signal on a display. A step of displaying, a step of selecting and instructing an image display mode based on the first video signal or the second video signal on the display, and the display on the display When there is an instruction to select an image display mode, the video signal output from the step of outputting any one of the video signals is selected, and in this step, the first video signal is output, and the aspect information is When the image display mode is extracted, the image display mode on the display is set in response to the aspect information, and when the image display mode is selected in the image display mode according to the setting, the selected image display mode is selected. the first video signal is set so as to be displayed on said display by said selection instruction image display mode, also include subsequently aspect information in the first video signal, an image display mode wherein the selected instruction And preferentially displaying on the display.

  According to the present invention, in response to display-related information such as aspect information extracted from a digital signal received via an HDMI connector, the aspect of the display image is automatically set and the user can enter any display mode. When set, priority can be given to the display mode designated by the user without responding to the transmitted display-related information, and an image display device and an image display method suitable for the user's preference can be realized.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an image display device 11 according to an embodiment of the present invention. The image display device 11 has a function of receiving a television broadcast signal, a function of receiving analog video and audio signals, and a function of receiving a digital video signal compliant with the HDMI standard.

  That is, the television broadcast signal is received by the antenna 12 and supplied to the television signal processing unit 14 via the input terminal 13. The television signal processing unit 14 extracts a signal of a predetermined channel from the input television broadcast signal by the tuner unit 14 a, restores an analog video signal and audio signal by the signal processing unit 14 b, and sends them to the selector 15. Output.

  Analog video and audio signals are received at an AV (Audio Video) input terminal 16 and input to the selector 15 as they are. Further, the digital video signal supplied from the external device 17 via the digital transmission bus 18 compliant with the HDMI standard is received by the HDMI connector 19 and supplied to the HDMI signal processing unit 20. As will be described in detail later, the HDMI signal processing unit 20 restores an analog video signal and audio signal from the input digital signal conforming to the HDMI standard, and outputs the analog video signal and audio signal to the selector 15.

  The selector 15 then outputs analog video and audio signals output from the television signal processing unit 14, analog video and audio signals supplied to the AV input terminal 16, and analog output from the HDMI signal processing unit 20. The video signal and the audio signal are selectively switched and output, the video signal is supplied to the video processing circuit 21, and the audio signal is supplied to the audio processing circuit 22. The video signal from the video processing circuit 21 is supplied to the display 30, and the audio signal from the audio processing circuit 22 is supplied to the speaker 40, so that video and audio are reproduced.

  Here, in the image display device 11, most of the operations including the various reception operations described above are controlled by the control unit 23. The control unit 23 is a microprocessor including a CPU (Central Processing Unit) and the like, receives operation information from the operation unit 24, or receives operation information sent from the remote controller 25 via the reception unit 26. Receiving and controlling each part so that the operation content is reflected.

  In this case, the control unit 23 uses the memory unit 27. That is, the memory unit 27 mainly includes a read-only memory that stores a control program executed by the CPU of the control unit 23, a read / write memory that provides a work area for the CPU, and various setting information and control information. Non-volatile memory to be stored.

Next, the schematic configuration of the HDMI signal processing unit 20 will be described with reference to FIG. As shown in FIG. 2, the HDMI signal processing unit 20 includes an HDMI receiving circuit 201, E
A DID memory 202, an HDCP memory 203, a video signal output circuit 204, an audio signal output circuit 205, and a sub-control unit 206 are provided. The HDMI connector 19 and the HDMI receiving circuit 201 are connected by a high-speed digital transmission path for transmitting video and audio signals and a communication control bus for transmitting control information.

  The EDID memory 202 stores control information related to the display 30, for example. EDID is an abbreviation for Extended Display Identification Data, and is data for causing the display side (image display device 11) to recognize information (resolution, number of pixels, etc.) on the display side from the host side (external device 17). The HDCP memory 203 stores key data for controlling copy protection of a digital input signal input via the HDMI connector 19. HDCP is an abbreviation for High Band Digital Content Protection.

  A digital input signal is supplied to the HDMI receiving circuit 201 via the HDMI connector 19. The HDMI receiving circuit 201 includes, for example, a D / A converter, converts a digital video signal included in a digital input signal input via the HDMI connector 19 into an analog video signal, and supplies the analog video signal to the video signal output circuit 204. . Note that the HDMI receiving circuit 201 is not necessarily provided with a D / A converter.

  When the HDMI receiving circuit 201 is not equipped with a D / A converter, the HDMI receiving circuit 201 supplies a digital video signal to the video signal output circuit 204. In this case, the video signal output circuit 204 includes a D / A converter, converts the digital video signal into an analog video signal, and outputs the analog video signal to the selector 15. Further, the HDMI receiving circuit 201 supplies a digital audio signal included in a digital signal input via the HDMI connector 19 to the audio signal output circuit 205. The audio signal output circuit 205 includes a D / A converter, converts the digital audio signal into an analog audio signal, and outputs the analog audio signal to the selector 15.

  Further, the sub control unit 206 detects a signal input state from the HDMI connector 19. That is, the sub control unit 206 detects whether or not there is a signal input from the HDMI connector 19 and extracts display related information. The sub control unit 206 communicates with the main control unit 23, controls the selector 15 based on the detection result of the signal input state and the signal selection instruction from the main control unit 23, and receives the input signal supplied from the HDMI connector 19. select.

  Next, a display example of an image when a digital signal conforming to the HDMI standard is received by the HDMI connector 19 via the transmission bus 18 will be described with reference to FIG. The display 30 has a 16: 9 wide screen as an example.

  FIG. 3A illustrates an example in which aspect information is included in a digital signal compliant with the HDMI standard, and the aspect information is a 4: 3 image. That is, when the aspect information included in the transmitted digital signal indicates 4: 3 as shown in FIG. 3A, the HDMI receiving circuit 201 of the HDMI signal processing unit 20 extracts the aspect information and extracts the sub information. This is supplied to the control unit 206.

  The sub-control unit 206 sends aspect information to the main control unit 23, and the control unit 23 controls the video processing circuit 21 to display a 4: 3 image on the display 30 as shown in FIG. Control to do. That is, a non-image portion is provided on the left and right sides of the screen, and a 4: 3 image is displayed in the center portion.

  Further, as shown in FIG. 3B, the aspect information indicates that the image is a 4: 3 letterbox (4: 3 as a whole with non-image parts at the top and bottom of the 16: 9 image). In this case, the aspect information is sent from the sub-control unit 206 to the main control unit 23, and the control unit 23 controls the video processing circuit 21 to display 4: 3 on the display 30 as shown in FIG. Display the letterbox screen. In this case, no-image portions are also generated on the left and right sides of the screen.

  However, even if the display mode can be automatically set as described above, the display mode may not always match the display mode desired by the user, and the display image may be unsatisfactory for the user.

  Therefore, in this embodiment, when the user designates the display mode, the image is displayed in the mode designated by the user, and even if the aspect information is included in the digital signal compliant with the HDMI standard thereafter, Is ignored without response, and the display mode specified by the user is given priority.

  For example, even if the aspect information indicates 4: 3 as shown in FIG. 3A, when the user designates the full mode, the screen is displayed on the 16: 9 screen as shown in FIG. 3A2. The 4: 3 image can be stretched horizontally to display the image on the entire screen, and the left and right no-image portions can be eliminated to display the image on the entire screen. Further, even when the aspect information indicates that the image is 4: 3 letterbox as shown in FIG. 3B, when the user designates the zoom mode, the aspect information is shown in FIG. 3B2. In this way, the 16: 9 image can be displayed on the entire screen by omitting the upper and lower no-image portions.

  Therefore, when specified by the user, even if aspect information is included in the digital signal from the transmission side, the display mode does not change automatically in response to it, and the image can be displayed in the mode desired by the user. .

  On the other hand, when the input source is switched, for example, when switching is made so that the video received by the tuner unit 14a is processed and displayed instead of the digital input from HDMI, the state is switched to a state where there is no user designation. Thus, when digital input from HDMI is selected again, the display mode is automatically set based on the extracted aspect information.

  FIG. 4 shows a flowchart summarizing the overall operation of the image display device 11 described above. First, when any input source is selected in start step S1, it is determined whether or not digital input from HDMI is selected in step S2. When digital input from HDMI is selected, the aspect information is extracted in step S3, and the display mode is automatically set based on the aspect information in step S4.

  Further, when the user designates another display mode with the remote controller 25 or the like while displaying in the automatically set mode, it is determined in step S5, and the display according to the user's instruction in step S6. Switch to display images in mode. If the digital input from HDMI is not selected in step S2, the image is displayed in the mode set in advance in step S7, and it is confirmed in step S5 whether there is an instruction to change the display mode according to a user instruction. .

  As described above, in the embodiment of the present invention, it is possible to enable display that achieves both convenience of automatic setting and user preference.

1 is a block diagram showing an embodiment of an image display device according to the present invention. The block diagram which shows the structure of the HDMI signal processing part used with the image display apparatus of this invention. Explanatory drawing for demonstrating the various image display modes in this invention. The flowchart for demonstrating the image display operation | movement of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Image display apparatus 14 Television signal processing part 15 Selector 17 External apparatus 19 HDMI connector 20 HDMI signal processing part 23 Control part 201 HDMI receiving circuit 206 Sub-control part

Claims (6)

An HDMI connector to which a digital transmission bus compliant with the HDMI standard is connected;
The video signal is decoded from the digital signal received through the HDMI connector, the first video signal is restored and output, and when the received digital signal includes aspect information, An HDMI signal processing unit for extracting and outputting
A broadcast signal processing unit that outputs a second video signal including a video signal obtained by receiving and processing the received broadcast signal;
A selector that outputs any one of the first video signal and the second video signal to be input;
A display for displaying an image based on the video signal selected and output by the selector;
A selection instruction unit for selecting and instructing an image display mode based on the first video signal or the second video signal to the display;
When the video signal output from the selector is selected and the first video signal is output from the selector and the aspect information is extracted, the image display mode on the display is set in response to the aspect information. Set,
If there is an instruction to select an image display mode from the selection instruction unit in the image display mode based on the setting, the first video signal selected by the selector is displayed on the display in the image display mode instructed to be selected. A control unit configured to display and then set to display the selected image display mode with priority even when aspect information is included in the first video signal. An image display device characterized by that.   The image display apparatus according to claim 1, wherein the control unit sets an aspect of an image displayed on the display in response to aspect information extracted by the HDMI signal processing unit. The video signal is decoded from the digital signal received via the digital transmission bus compliant with the HDMI standard, the first video signal is restored and output, and the received digital signal includes aspect information. Extracting it if it has, and
Outputting a second video signal including a video signal obtained by receiving and processing the received broadcast signal;
Outputting any one of the first video signal and the second video signal to be input;
Displaying an image of the output video signal on a display;
Selecting and instructing an image display mode based on the first video signal or the second video signal to the display;
When there is an instruction to select the image display mode on the display,
The video signal output from the step of outputting any one of the video signals is selected, and when the first video signal is output and the aspect information is extracted in this step, the response to the aspect information is performed. To set the image display mode on the display,
If there is an instruction to select the image display mode during the image display mode according to the setting, the selected first video signal is set to be displayed on the display in the image display mode selected, and then said first be included aspect information to the video signal, image display method comprising the steps of setting to be displayed on the display with priority image display mode in which the selected instructions.   4. The image display method according to claim 3, wherein when setting the image display mode, an aspect of an image displayed on the display is set in response to the extracted aspect information. A connection means to which a digital transmission bus for transmitting a digital signal including display related information is connected;
It said connection means and decodes the video signal from the digital signal received through the first signal processing unit for outputting a first video signal and extracts and outputs the display-related information included in the digital signal When,
A second signal processing unit that outputs a second video signal including a video signal obtained by receiving and processing the received broadcast signal;
A selector that selectively outputs one of the first video signal and the second video signal;
A selection instruction unit for selecting and instructing an image display mode based on the first video signal or the second video signal on a display for displaying an image based on the video signal;
When the first video signal is selected by the selector and the display related information is extracted, the first video signal is set to be displayed on the display in an image display mode in response to the display related information. And
If there is an instruction to select an image display mode by the selection instruction unit during the image display mode by the setting, the first video signal is set to be displayed on the display in the image display mode instructed to be selected, And a control unit configured to prioritize the image display mode selected and displayed on the display even when display related information is included in the first video signal. Image display device. The control unit is set to display the first video signal on the display in the selected image display mode when the display related information is extracted from the first video signal, and then When the second video signal is selected by the selector, the first video signal is displayed in response to the display related information when the display related information is extracted from the first video signal. 6. The image display device according to claim 5, wherein the display is set to display on the display in a mode.

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