JP2010048974A - Image display, its control method and program, and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the time to detect the format for any kind of image signals and quickly switch the input images. <P>SOLUTION: A digital television 100 includes an image format detector 11 to periodically detect the format of image signals at least for some of the image signals inputted to a digital television 100, a format information controller 21 to store the format information of the image signals detected by the image format detector 11 in the format information memory 30 by correlating it with the input routes, and an image setup controller 22 to carry out the video setup of the display modules (4-8) for outputting the image signals to the display 8 according to the format information correlated with the input routes of the image signals to be switched and stored in the format information memory 30 when an image signal switching event happens. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a video display device, a video display device control method, a control program, and a recording medium that output an input video signal to a display unit.

  2. Description of the Related Art Conventionally, video display devices such as televisions and personal computers that can switch and display video signals of various formats with different standards on a single unit or in cooperation with a plurality of devices are widely used. Yes. In recent video display devices, a plurality of devices, large-capacity recording media, and the like are externally connected, and videos taken from these devices are often viewed. Furthermore, in digital broadcasting in recent years, the amount of digital signal video information processing has increased dramatically due to digital signal encoding processing, decoding processing, IP conversion processing, Y / C separation processing, and the like. Therefore, the video display apparatus has a problem that it takes a long time to process the video signal.

  In such a video display device, the video signal input path is specified by the video selector by determining the standard of the connection terminal such as the HDMI terminal and the format of the signal to be communicated, and the video signal input from the path After that, the video setting corresponding to the format is performed on each mechanism for displaying the video signal, and the video signal is finally output appropriately.

  Here, in order for the video signal to be appropriately output in the video display device, it is indispensable to properly detect the format. In video format detection, the sync signal is counted to recognize the format. Therefore, in order to maintain the format detection accuracy, a certain amount of time must be taken for the format detection (for example, at least 300 to 400 ms).

  Therefore, when the video signal input path is switched and the output video signal is switched to another one, it is necessary to start again from the format detection, and it takes time until the video is switched. In particular, in a video display device that switches video signals by a sequential procedure of receiving a video signal switching instruction, detecting the format, and switching the video signal, it takes a long time to switch the video. Inevitably, this time lag has caused stress for the viewing user.

  In order to reduce such a user's stress, the device for shortening the time of a video signal switching process is made | formed.

  For example, in Patent Document 1, the video format information and aspect ratio information of a program of a channel to be selected are acquired before channel selection, and the channel selection is started by setting the information to the monitor and starting the channel selection. A digital broadcast receiving apparatus that shortens the time from the start to the completion of normal video display is disclosed.

Further, Patent Document 2 discloses that when the power is turned on or when the video input is switched, the time required for the setting process in the device according to the video input format (scanning frequency, etc.) to be output is shortened. A video device setting method for speeding up the video is disclosed. Specifically, the format information is stored in the last memory for each of one or more external inputs, and when the input is reselected next time or when the power is turned on again, the information stored in the last memory in advance is detected rather than the detection result of the current input. The image output control is performed with priority. Thereby, the output control is performed in parallel with the format detection of the current input.
JP 2007-110295 (published April 26, 2007) Japanese Unexamined Patent Publication No. 2007-151031 (released on June 14, 2007)

  However, the techniques described in the above-described patent documents have the following problems.

  The digital broadcast receiving apparatus described in Patent Document 1 specifies a broadcast standard as information for setting a monitor. However, since this broadcast standard information is obtained from the EIT (Event Information Table) of SI (Service Information) data included in the broadcast signal, it can only deal with broadcast signals including SI data. That is, it cannot cope with switching of various video signals not including SI data, and the switching time to those video signals cannot be shortened. For example, it cannot cope with external input signals input via cable terminals compliant with various video standards.

  In the device setting method described in Patent Document 2, the image output control is performed with priority given to the information of the image previously stored in the last memory rather than the detection result of the current input in the video device. Therefore, if the format of the input video at the time of video input switching matches the format stored in the last memory, the switching / image output time can be shortened, but if they do not match, switching to the above video input is possible. The time cannot be shortened.

  Further, even after the input is switched, the video format may be changed at a short time interval. Therefore, such change cannot be followed only by using the last-memory information.

  Furthermore, in recent years, the number of external connection terminals including an HDMI terminal and a PC input terminal has increased in video display devices. However, there are cases in which input performed through these terminals is used for a specific purpose. Yes (for example, game-dedicated input, AV amplifier input, etc.), high-speed switching is increasingly required to improve usability.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a video display device and a video display device that can reduce the format detection time and perform video input switching at high speed in response to all video signals. To realize a control method, a control program, and a recording medium.

  In order to solve the above problems, the video display device of the present invention includes a plurality of video signal input paths, and switches the plurality of video signals input from the plurality of input paths to output to the display unit. Format detection means for periodically detecting the format of each video signal for at least a part of the plurality of video signals input to the video display device; and format information of the video signal detected by the format detection means. Format information management means for storing in the format information storage unit in association with the input path, and when the video signal switching event occurs, the format information management unit is associated with the input path of the video signal to be switched, which is stored in the format information storage unit. The display module outputs the video signal to the display unit according to the format information. It is characterized in that it comprises a video setting control means for setting.

  According to the above configuration, the format detection unit analyzes the format of all or part of video signals input via the input path included in the video display device, and periodically detects the video format. Regardless of which video signal is displayed on the video display device or which video signal is switched to, that is, independent of the video display / switching process, the format of the video signal in a fixed input path Are sequentially detected.

  Subsequently, the format information periodically detected in this way is stored in the format information storage unit by the format information management means. The format information management means stores the format information in association with the input path so that the format information detected by the format detection means can be understood from which input path the format information is from the video signal. Thus, the format information storage unit always stores the format information updated periodically for each input path in the latest state.

  When a video signal switching event occurs, the video setting control unit refers to the format information storage unit and identifies format information associated with the input path of the video signal to be switched. Then, the video setting control means controls each part of the display module that executes the video display / switching process so that the video setting process is appropriately performed according to the format information.

  As a result, when a video signal switching event occurs, the video setting process can be immediately executed based on the format information stored in the format information storage unit, and the process can be smoothly shifted to the process of displaying the switched video signal. It becomes possible.

  As described above, according to the video display device of the present invention, since the format detection means periodically performs the format detection in advance (independent of the display process), when the display (switching) process is executed. Thus, it is not necessary to wait for the completion of format detection as in the prior art, and it is possible to immediately obtain necessary format information from the format information storage unit.

  The periodic format detection process is not limited to a specific input path, and periodically detects the format of a video signal from any input path included in the video display device. In addition, since the detection process is repeated periodically, the format information is maintained with high accuracy even when the video signal format changes rapidly.

  As a result, it is possible to shorten the format detection time corresponding to any video signal and to perform video input switching at high speed.

  The video display device further includes a predetermined period when the format detection unit selects one video signal input path to be detected from the plurality of input paths and performs format detection for each input path. It is preferable to include a detection timing control means for determining based on the weight value determined in (1).

  According to the above configuration, the detection timing control means determines how long the format detection means should spend for format detection for one input path based on a weight value determined for each input path. decide.

  Thereby, the format detection means detects the format of the video signal of the input path based on the period for each input path determined by the detection timing control means. When the above period expires, another input path is selected and the format detection is repeated. In this way, the format detection means can realize a periodic format detection process.

  As described above, by setting the time required for format detection for each input path, the importance of the path is such that more accurate format detection is performed on the video signal of the input path with high importance. It becomes possible to adjust the accuracy according to.

  The video display device further includes a detection target selection means for switching the input path of the video signal to be detected from the plurality of input paths in a predetermined period and transmitting the video signal to be detected to the format detection means. It is preferable to provide.

  According to the above configuration, when the format detection unit spends a predetermined period of time for the format detection unit to detect the format for one input path, the detection target selection unit next switches the input path of the video signal to be detected. Then, a new video signal is transmitted to the format detection means.

  As a result, it is possible to periodically repeat the format detection while adjusting the period spent for the format detection of each input path to a certain period.

  The video display device preferably further includes weight calculation means for calculating the weight value based on state information indicating the state of each input path.

  According to the above configuration, the weight calculation unit can calculate the weight value more appropriately in consideration of the importance and urgency of the input route according to the state of each input route. Is possible. If the weight value is calculated appropriately in accordance with the importance level and the urgency, it is possible to set a more appropriate period for detecting the periodic format for each input path.

  As a result, the operation of the format detection means is controlled, and more important input paths (video signals), more frequently and longer for input paths (video signals) that require higher speed and urgency at the time of switching, Format detection is performed so that accurate format information is always maintained.

  It is preferable that the video display device further includes user interface means for displaying an operation screen for the user to set the weight value on the display unit.

  According to the above configuration, the user can set the weight value to an arbitrary value via the operation screen displayed on the display unit. As a result, format detection is performed according to the weight value reflecting the user's wishes, so that highly accurate format information is always maintained for the input path (video signal) important to the user.

  The user interface means further selects to the user whether to use an automatic calculation mode in which the weight value is a value calculated by the weight calculation means or a manual setting mode in which the user sets the weight value. It is preferable to display an operation screen for causing the display on the display unit.

  According to the above configuration, the user can select either the automatic calculation mode by the weight calculation unit described above or the manual setting mode in which the user arbitrarily sets the weight value. Since the user only has to select the manual setting mode only when he / she wants to adjust the weight value, the convenience for the user is improved.

  The format detection means of the video display device detects the format a plurality of times at a predetermined interval within a period defined in the input path for each input path, and the format information management means When the same information is detected continuously for a predetermined number of times, it is preferable to store the detected information in the format information storage unit as the format information of the input path.

  According to the above configuration, the format detection unit performs format detection for each input path a plurality of times at a predetermined interval within a period defined in the input path. On the other hand, the format information management means does not store the detection result information executed at a predetermined interval in the format information storage unit each time, but the detection result information executed a plurality of times at a predetermined interval, If the information is the same information continuously for a predetermined number of times, the information is stored in the format information storage unit as formal format information.

  This prevents the format information from being busy when the format changes in an extremely short time and is not stable, and only the format that is stably maintained above a certain level is the correct format information. Updated to the format information storage unit.

  As a result, the reliability of the format information stored in the format information storage unit can be increased.

  In order to solve the above-described problem, the video display device control method of the present invention includes a plurality of video signal input paths, and switches a plurality of video signals input from the plurality of input paths to output to the display unit. A control method for a display device, comprising: a format detection step for periodically detecting the format of each video signal for at least some of the plurality of video signals input to the video display device; and the format detection step. The format information management step for storing the format information of the detected video signal in the format information storage unit in association with the input path, and when the video signal switching event occurs, the format information management unit stores the format information. The above video signal is matched to the format information associated with the video signal input path. It is characterized in that it comprises a video setting control step of performing the image settings of the display module to be output to the radical 113.

  According to the above method, the format information about the video signal of any input path can be detected and stored independently of the video display / switching process in the display module of the video display device. Thus, the format detection time can be shortened, and the video input can be switched at high speed.

  The video display device may be realized by a computer. In this case, a control program for the video display device that causes the video display device to be realized by the computer by causing the computer to operate as the respective means, and A computer-readable recording medium on which is recorded also falls within the scope of the present invention.

  In order to solve the above problems, the video display device of the present invention is a format detection means for periodically detecting the format of each video signal for at least some of the plurality of video signals input to the video display device. Format information management means for storing the format information of the video signal detected by the format detection means in the format information storage section in association with the input path; and storing the format information in the format information storage section when a video signal switching event occurs. And video setting control means for setting the video of the display module that outputs the video signal to the display unit in accordance with the format information associated with the input path of the video signal to be switched. Yes.

  In order to solve the above problems, the video display device control method of the present invention periodically detects the format of each video signal for at least some of the plurality of video signals input to the video display device. A format detection step, a format information management step for storing the format information of the video signal detected in the format detection step in the format information storage unit in association with the input path, and the format information when a video signal switching event occurs. A video setting control step for performing video setting of a display module that outputs the video signal to the display unit in accordance with the format information stored in the storage unit and associated with the input path of the video signal to be switched. It is a feature.

  Therefore, it is possible to shorten the format detection time corresponding to all video signals and to perform video input switching at high speed.

  An embodiment of the present invention is described below with reference to the drawings. In the present embodiment, as an example, a case will be described in which the video display device of the present invention is applied to a digital television provided with various input terminals for analog and digital video signals.

[Outline of digital TV]
FIG. 2 is a block diagram showing a schematic configuration of the digital television 100 according to the embodiment of the present invention.

  As shown in FIG. 2, the digital television 100 includes a control unit 1, an operation unit 2, a storage unit 3, an analog video switch 4, an AD converter 5, a digital video switch 6, a video adjustment control unit 7, a display unit 8, and cable insertion detection. Unit 9, detection target selection switch 10 and video format detection unit 11, and digital TV 100 further includes various video signal input terminals, analog video input terminal A 1, analog video input terminal A 2, analog video input terminal A video input terminal A3, an analog video input terminal A4, a digital video input terminal D1, a digital video input terminal D2, and a digital video input terminal D3 are provided. Note that the types and number of input terminals included in the digital television 100 shown in FIG. 2 are examples, and the configuration of the digital television 100 of the present invention is not limited.

  The control unit 1 performs overall control of each unit included in the digital television 100. The control unit 1 further includes each unit as a functional block, which will be described later.

  The operation unit 2 is for a user to input various command signals to the digital television 100. For example, the operation unit 2 is not limited to this, but can be realized as a remote controller that transmits a command signal to the digital television 100 as an infrared signal. The user operates the operation unit 2 to give a command signal to the digital television 100 for instructing to call a menu screen, to watch a digital broadcast, or to switch a video signal to one from another input terminal. Can be entered.

  The storage unit 3 stores a control program executed by the control unit 1, an OS program, and various types of data read when the control unit 1 executes various functions of the digital television 100, such as a flash memory. A non-volatile storage device is used. The storage unit 3 stores various data used when the control unit 1 detects the format of the video signal and measures the detection timing and the weight value of the detection frequency. Specific examples of various data stored in the storage unit 3 will be described later.

  The analog video switch 4 switches the video signal input path so that any one of the analog video signals input from the analog video input terminals A1 to A4 included in the digital television 100 is output. The analog video signal input from the input terminal selected by the analog video switch 4 is transmitted to the AD converter 5.

  The AD converter 5 converts the analog video signal transmitted from the analog video switch 4 into a digital video signal. As a result, the digital television 100 can digitally process the input analog video signal.

  The digital video switch 6 is a digital video signal obtained by digitizing the digital video signal input from the digital video input terminals D1 to D3 included in the digital television 100 and the original analog video signal transmitted from the AD converter 5. The input path of the video signal is switched so that any one of them is output. The digital video signal input from the input terminal (or AD converter 5) selected by the digital video switch 6 is transmitted to the video adjustment control unit 7.

  The video adjustment control unit 7 appropriately adjusts the digital video signal selected by the digital video switch 6 according to the specification of the display unit 8 and outputs the digital video signal to the display unit 8.

  The display unit 8 displays an operation screen (such as a GUI screen) that prompts an instruction input from the user performed via the operation unit 2 and a video signal input from each input terminal as a video that can be viewed by the user. It is. As the display unit 8, for example, an LC (Liquid Crystal) display device, an EL (Electro Luminescence) display device, or the like can be suitably applied.

  The cable insertion detection unit 9 detects whether or not a cable connecting an external video output device and the digital television 100 is inserted at each input terminal of the digital television 100. The information on the presence or absence of the cable insertion detected by the cable insertion detection unit 9 is used when the control unit 1 measures the format detection timing and the detection frequency weight value.

  The detection target selection switch 10 selects and switches one video signal (input terminal) to be subjected to format detection from video signals input via each input terminal provided in the digital television 100. . The detection target selection switch 10 selects an appropriate detection target terminal according to the detection timing calculated by the control unit 1, and the video format detection unit 11 detects a video signal input through the detection target terminal for format detection. Transmit to.

  The video format detection unit 11 detects the video format of the video signal input from the detection target selection switch 10. In addition to being able to detect the format of the video signal to be displayed before the video signal is displayed on the display unit 8 as before, the video format detection unit 11 can further detect the format. In the embodiment, independent of (in parallel with) the display processing of the video signal, the format detection of all the video signals input from the input terminals of the analog video input terminals A1 to A4 and the digital video input terminals D1 to D3 is performed. It can be performed periodically. The periodic format detection process performed independently of the video display process will be described later.

[Configuration of digital TV]
FIG. 1 is a block diagram showing a main configuration of a digital television 100 according to an embodiment of the present invention. Note that the reference numerals given to the respective constituent elements in FIG. 1 correspond to the reference numerals given to the respective constituent elements in FIG. 2, and the same reference numerals indicate the same constituent elements. Therefore, the description about the component already demonstrated is not repeated.

  As shown in FIG. 1, the control unit 1 includes a detection timing control unit 20 as a functional block, a format information management unit 21, a video setting control unit 22, a video switching control unit 23, a state monitoring unit 24, and a weight calculation unit 25. ing. The storage unit 3 includes a format information storage unit 30, a weight information storage unit 31, a state information storage unit 32, and a detection specification storage unit 33.

  The detection timing control unit 20 controls the timing of the video signal format detection performed by the video format detection unit 11. Specifically, according to the detection specification information stored in the detection specification storage unit 33, the detection target selection switch 10 determines at what timing and how long the format of the video signal from which input terminal is detected. And instructing the video format detection unit 11. Thereby, the detection target selection switch 10 can switch the detection target terminal at an appropriate timing. In addition, the video format detection unit 11 can periodically perform format detection at an appropriate timing with respect to the video signal of the appropriately selected detection target terminal.

  Furthermore, in the present embodiment, the detection timing control unit 20 may determine the frequency and length of the format detection of the video signal at each input terminal according to the weight value stored in the weight information storage unit 31. For example, the detection timing control unit 20 can determine the timing so that the format detection is frequently executed for a longer time for an input terminal that the user likes and views frequently.

  The format information management unit 21 stores and manages the format information of the video signal detected by the video format detection unit 11 in the format information storage unit 30. The format information management unit 21 stores the format information detected by the video format detection unit 11 in the format information storage unit 30 for each of the seven input terminals included in the digital television 100.

  The format information management unit 21 may store, in the format information storage unit 30, format information that is periodically detected at regular intervals for each input terminal, but is not limited thereto. In this embodiment, the format information management unit 21 temporarily stores periodically detected format information in a volatile memory such as a RAM (not shown) each time it is detected, and the same format is used for one input terminal. Only when the information is continuously detected a predetermined number of times or more, the format information is stored in the format information storage unit 30 in association with the input terminal.

  According to the above configuration, when the format of the video signal is unstable, the format information is prevented from being rapidly rewritten every time it is detected, and only when the same format information of a certain length is detected. It can be saved in the format information storage unit 30 as correct format information. Thereby, the reliability of the format information for each input terminal stored in the format information storage unit 30 can be improved.

  The video setting control unit 22 converts the format information of the video signal to be displayed into the analog video switch 4, the AD converter 5, and the like so that the selected video signal is appropriately processed and appropriately displayed on the display unit 8. This is transmitted to each part of the digital video switch 6, the video adjustment control unit 7 and the display unit 8 to instruct video setting processing. As a result, each of the above-described units can appropriately perform video display processing according to the transmitted format information, so that any format video signal is input and displayed on the display unit 8 appropriately. It becomes possible.

  The timing at which the video setting control unit 22 instructs the above-described units to perform the video setting process is specifically assumed to be when the following event occurs. For example, for the video signal (input terminal) currently being displayed, the format information stored in the format information storage unit 30 is changed. The video setting control unit 22 monitors the format information stored in the format information storage unit 30 for the input terminal that is currently being displayed, and if the format information changes, it follows the changed format. As described above, the above-described units are controlled. Or the event that the video signal of a display object is switched to the video signal from another input terminal is also assumed. When the video signal (input terminal) to be displayed is switched, the video setting control unit 22 acquires the format information associated with the switched input terminal from the format information storage unit 30 and transmits it to each of the above units. And instruct the video setting process.

  The video switching control unit 23 detects a video signal switching event, and instructs the analog video switch 4 or the digital video switch 6 to switch the video signal to be output. As the video signal switching event, for example, it is assumed that a cable is connected to the input terminal, or that a video switching instruction is input by the user via the operation unit 2.

  The state monitoring unit 24 monitors the state of the digital television 100, particularly the state relating to each input terminal, in accordance with any event that occurs in the digital television 100. In the present embodiment, the state monitoring unit 24 (1) determines whether or not the input terminal supplies a video signal during video display processing, (2) whether or not a video signal switching (input terminal selection) event has occurred, and (3) each (4) Edit input terminal preference registration information, (5) Change input terminal monitoring skip setting, (6) Dedicated input of external video output device connected via each input terminal The six items of presence / absence of key are monitored for each input terminal, and the status information as a monitoring result is stored in the status information storage unit 32 for each input terminal. The six items to be monitored are examples, and the configuration of the state monitoring unit 24 is not limited.

  As a result of monitoring by the state monitoring unit 24, the state information stored in the state information storage unit 32 is calculated by the weight calculation unit 25 for the format detection weight value (periodical format detection timing, frequency, etc.) for each input terminal. Used when

  The weight calculation unit 25 calculates a weight value for specifying at what timing and frequency the format information should be detected for the video signal from which input terminal according to the state information of each input terminal. It is. The weight calculation unit 25 acquires the state information stored in the state information storage unit 32, and determines the importance of the input terminal according to the state information. Then, the weight calculation unit 25 calculates an appropriate weight value so that the format detection is performed longer and more frequently with respect to the video signal from the input terminal with high importance.

  The weight value calculated for each input terminal by the weight calculation unit 25 is stored in the weight information storage unit 31 and used by the detection timing control unit 20.

  Each unit (the detection timing control unit 20, the format information management unit 21, the video setting control unit 22, the video switching control unit 23, the state monitoring unit 24, and the weight calculation unit 25) shown as the functional block is a CPU (central processing unit). Can be realized by reading a program stored in a storage device such as a ROM (read only memory) (not shown) into a RAM (random access memory) and executing the program.

  As described above, the digital television 100 is configured to perform video display processing for switching / displaying video signals input via the input terminals, detection processing for detecting format information of video signals at the input terminals, and digital television. Three weight calculation processes for calculating a weight value for determining the format detection timing and frequency are executed in accordance with 100 states.

  In the following, for convenience of explanation, components for executing the video display process, that is, an analog video switch 4, an AD converter 5, a digital video switch 6, a video adjustment control unit 7, a display unit 8, and a video setting control unit 22 are described. The video switching control unit 23 and the operation unit 2 are collectively referred to as a display module. The components for executing the detection process, that is, the detection target selection switch 10, the video format detection unit 11, the detection timing control unit 20, the format information management unit 21, the format information storage unit 30, and the detection specification storage unit 33, Collectively referred to as a detection module. The components for executing the weight calculation process, that is, the cable insertion detection unit 9, the state monitoring unit 24, the weight calculation unit 25, the weight information storage unit 31, the state information storage unit 32, and the operation unit 2 are collectively weighted. This is called a calculation module.

  In the digital television 100 of the present invention, each module can execute each process independently (in parallel). Next, the flow of each process in each module will be described with reference to FIG.

[Digital TV processing flow]
FIG. 3 is a flowchart showing a process flow of each module provided in the digital television 100 according to the embodiment of the present invention.

  When the power of the digital television 100 is turned on (YES in S1), the analog video switch 4 and the digital video switch 6 select (switch) the input terminal that was viewed last time, and switch the input terminals (A1 to A4). Alternatively, the route is determined so that the video signal from any one of the input terminals D1 to D3 is transmitted to the video adjustment control unit 7 (S2).

  Subsequently, the video setting control unit 22 of the control unit 1 checks whether or not the format information of the input terminal selected in S <b> 2 is stored in the format information storage unit 30. Here, when the format information is not stored in the format information storage unit 30 (NO in S3), the detection module detects the format information of the selected input terminal (S4). When the format information has already been stored (YES in S3), the video setting control unit 22 acquires the format information of the selected input terminal (target terminal) from the format information storage unit 30.

  When the selected target terminal is an analog video input terminal (A in S6), the video setting control unit 22 selects each part of the analog path (analog video switch 4, AD converter 5, digital video switch 6, video adjustment). The format information acquired in S4 or S5 is transmitted to the control unit 7 and the display unit 8) to instruct video setting processing (S7). On the other hand, when the target terminal is a digital video input terminal (D in S6), the format information is transmitted to each part of the digital path (digital video switch 6, video adjustment control unit 7 and display unit 8), A video setting process is instructed (S8).

  As a result, after the power is turned on, for the first time, the video signal of the target terminal viewed immediately before is displayed on the display unit 8 (S9). Thereafter, until the format information changes in the video signal being output in S10 or until an event for switching the video to a video signal from an input terminal different from the video signal being output occurs in S11. The video signal of S9 continues to be output (NO in S10 and S11).

  After the power is turned on, the display module performs the above-described video display process, while the detection module repeatedly executes the periodic format detection process (S100) independently of the video display process. When the detection timing control unit 20 detects the occurrence of the start event of the periodic format detection process (YES in S12), each unit of the detection module including the video format detection unit 11 is a video of seven input terminals provided in the digital television 100. The format is periodically detected for the signal (S13). Here, the detected format information is stored in the format information storage unit 30 for each input terminal (S14), and is used by the display module in S5.

  Returning to the description of the operation of the display module again. In S9, after the video signal of the immediately preceding target terminal is output for the first time, if the format information of the video signal changes or a video signal switching event occurs (YES in S10 or S11), S5 Return to the process.

  That is, the video setting control unit 22 acquires the format information changed in S10 or the format information of the target terminal switched in S11 from the format information storage unit 30 (second and subsequent S5).

  Here, as described above, since the detection module performs the periodic format detection process S100 independently of the video display process of the display module, the format detection is performed for each input terminal at the second and subsequent S5. The format information is stored in the format information storage unit 30.

  Therefore, the video setting control unit 22 immediately acquires necessary new format information from the format information storage unit 30 without waiting for the detection of the video signal that is about to be output, and sets the video setting in each part of the display module. It is possible to instruct processing.

  Thereby, even if the format information is changed or switched to another video signal in S10 or S11, the format tracking or the video signal switching is smoothly executed, and the time required for the video switching is shortened. It becomes possible to do.

  In the present embodiment, the digital television 100 may further include a weight calculation module. The weight calculation module calculates a weight value for determining the detection timing and detection frequency of each input terminal in the periodic format detection processing executed by the detection module. The weight calculation process S200 executed by the weight calculation module is executed independently of the video display process of the display module and the periodic format detection process of the detection module.

  When an event in which the state of the digital television 100 changes is derived in the digital television 100 (YES in S15), the state monitoring unit 24 of the weight calculation module stores the detected state of the digital television 100 in the state information storage unit 32. Update the status information that has been saved. When the state information in the state information storage unit 32 is updated, the weight calculation unit 25 calculates a weight value based on the updated state information (S16). The weight calculation unit 25 stores the newly calculated weight value in the weight information storage unit 31 (S17).

  The detection timing control unit 20 can control the detection target selection switch 10 and the video format detection unit 11 based on the weight value newly stored in the weight information storage unit 31.

  According to the above configuration, the detection module can always execute the periodic format detection process at an appropriate timing and frequency according to a change in the state of the digital television 100.

  Next, the periodic format detection process (S100) of the detection module will be described in more detail using a specific example.

[About format information]
FIG. 4 is a diagram illustrating a specific example of the format information of each input terminal detected by the video format detection unit 11. The format information is stored in the format information storage unit 30. Here, as an example, the analog video input terminal A1 in FIG. 2 is a composite input terminal, the analog video input terminal A2 is an S input terminal, the analog video input terminal A3 is a component input terminal, the analog video input terminal A4 is an RGB input terminal, digital Assume that the video input terminals D1 and D2 are HDMI terminals, and the digital video input terminal D3 is a DVI-D terminal. However, the input terminal included in the digital television 100 is not limited to this.

  As shown in FIG. 4, the format information detected by the video format detection unit 11 is stored for each input terminal included in the digital television 100. For example, the video format detection unit 11 analyzes the video signal input from the analog video input terminal A1 as the composite input terminal according to the control of the detection timing control unit 20, and the color system of the video signal is NTSC. Is detected and stored as format information. Further, the video format detection unit 11 analyzes the video signal input from the digital video input terminal D2 as the HDMI terminal, detects that the resolution of the video signal is XGA, and the refresh rate is 60 Hz, They are stored as format information. Since these are examples of format information, the detected format information is not limited to the above.

[About weight values]
FIG. 5 is a diagram illustrating a specific example of the weight value of each input terminal calculated by the weight calculation unit 25. The weight value is stored in the weight information storage unit 31.

  As shown in FIG. 5, in the present embodiment, as an example, the weight value is expressed as a percentage. The weight value is a value indicating what percentage of the predetermined detection period (how many milliseconds) of the periodic format detection process is used for the analysis of the input terminal.

  For example, the weight value “50%” associated with the analog video input terminal A1 is set to “500 milliseconds for analyzing the video signal of the analog video input terminal A1 when the predetermined detection cycle is 1000 milliseconds. It means "deplete".

  In the example shown in FIG. 5, the weight value of the input terminal A1 is 50%, the weight value of A2 is 30%, and the weight value of D1 is 20%. Therefore, the video format detection unit 11 performs analysis of the video signal at the analog video input terminal A1 for 500 milliseconds and analysis of the video signal at the analog video input terminal A2 for 200 milliseconds in the detection cycle of 1000 milliseconds. The format detection is periodically repeated by using milliseconds for analysis of the video signal at the digital video input terminal D1.

[About detection specification information]
FIG. 6 is a diagram illustrating a specific example of detection specification information used when the detection timing control unit 20 measures the detection timing. The detection specification information is stored in the detection specification storage unit 33.

  As shown in FIG. 6, in the present embodiment, three detection periods, detection intervals, and detection counts are stored as detection specification information.

  As described above, the detection cycle indicates the length of one round when the format of the seven input terminals (or a part thereof) included in the digital television 100 is periodically detected. In the example shown in FIG. 6, since the detection cycle is “1000 milliseconds”, the format detection of all necessary input terminals is performed with 1000 milliseconds as one round.

  The detection interval indicates a time interval for actually acquiring the format information from the video signal of the detection target terminal when the format detection is performed for one input terminal over a predetermined time. In the example shown in FIG. 6, the detection interval is “100 milliseconds”. Therefore, for example, when the video format detection unit 11 detects the format information over 500 milliseconds with respect to the analog video input terminal A1, the format information management unit 21 sets 5 at 500 millisecond intervals. Times, the detected format information is acquired and temporarily stored in a volatile storage device (not shown).

  The number of detections means that when format information of the same value is continuously acquired for one input terminal for the number of times, the value is stored in the format information storage unit 30 as formal format information. The threshold value of the number of times for determining the format information is shown. In the example shown in FIG. 6, when the format information management unit 21 acquires the format information at intervals of 100 milliseconds for the analog video input terminal A1, the format information management unit is acquired when the same value is acquired three times in succession. 21 associates the format information of the third time with the analog video input terminal A1 and stores it in the format information storage unit 30 to determine the format information. The information that is detected and compared to determine whether or not they are the same may be a numerical value such as a resolution, or may be information on characteristic waveforms of various video signals.

[Periodic format detection processing using weight values]
FIG. 7 is a timing chart showing the timing of operations performed by each unit of the detection module when the periodic format detection process is executed.

  Here, it is assumed that the detection module is operating according to the weight value shown in FIG. 5 and the detection specification information shown in FIG.

When viewing of the video signal at the analog video input terminal A1 is started, for example, when the digital television 100 is turned on, the detection module starts the periodic format detection process (T ₀ ). In T _0, the detection timing controller 20 instructs the detection object terminal to the detection object selection switch 10 to switch to the analog video input terminal A1. Then, the video format detection unit 11 analyzes the video signal of A1. At an interval of 100 milliseconds, that is, at time points T ₁ , T ₂ , T ₃ , T ₄ , and T ₅ , the format information management unit 21 acquires the format information detected by the video format detection unit 11 and continuously Count the number of times the same value was acquired. When the same value is acquired three times consecutively at time T ₃ , the format information management unit 21 determines the value acquired at T ₃ as format information and associates it with the analog video input terminal A 1 to format information. Store in the storage unit 30.

Detection timing control unit 20, based on the weight value, it is determined that the timing of the search target terminal switching after the lapse of T _5, the search target terminal the analog video input terminal from an analog video input terminal A1 of the detection object selection switch 10 Instruct to switch to A2. The video format detection unit 11 starts analyzing the video signal at the analog video input terminal A2. The format information management unit 21 acquires the format information detected by the video format detection unit 11 at time points T ₆ , T ₇ , and T ₈ . At the time of T _8, when different values are acquired from the time point T _7, the format information management unit 21 resets the count so far, re from the count 1 from the time of acquiring the value of T ₈ Start. Values and information on count 1 of T ₈ is detected terminal is switched to the digital video input terminal D1, be interrupted to detect the analog video input terminal A2, the detection of the analog video input terminal A2 at time T ₁₅ Is held until is restarted. When the same value as T ₈ is acquired at T ₁₅ and T ₁₆ , the format information management unit 21 determines the value as format information at the time of T ₁₆ , and the analog video input terminal The data is stored in the format information storage unit 30 in association with A2.

  According to the above configuration, when the format changes rapidly at an extremely short interval of 100 milliseconds, it is not necessary to follow such an unstable format every time. Based on the information, it is possible to appropriately perform video setting processing and output a video signal.

[Flow of periodic format detection processing]
FIG. 8 is a flowchart showing the flow of the periodic format detection process of the detection module. The periodic format detection process is executed independently of the video display process of the display module.

  When a start event of the periodic format detection process occurs such as when the power of the digital television 100 is turned on (YES in S101), the detection timing control unit 20 performs various detection specification information stored in the detection specification storage unit 33. And the detection time of each input terminal is set according to the weight value memorize | stored in the weight information storage part 31 (S102). For example, it is specified which input terminal is analyzed for how many milliseconds, assuming 1000 milliseconds as one round.

  In accordance with an instruction from the detection timing control unit 20, the detection target selection switch 10 selects a detection target terminal (S103). The video signal input from the selected detection target terminal is transmitted to the video format detection unit 11.

  The video format detection unit 11 analyzes the video signal of the detection target terminal transmitted from the detection target selection switch 10 and detects format information. The format information management unit 21 temporarily stores the detected format information in accordance with the detection interval stored in the detection specification storage unit 33 (S104). At this time, the format information management unit 21 counts the number of times that the same value is continuously acquired.

  The detection timing control unit 20 measures whether the video signal of the detection target terminal has been detected until the time set in S102. If the set time has elapsed (YES in S105), the process returns to step S103, and the detection target selection switch 10 is connected to another input terminal according to the instruction of the detection timing control unit 20, and the detection target is set. Switch.

  Here, in this embodiment, before returning to S103, the format information management unit 21 counts the number of times that the same value as the value of the format information of the video signal acquired periodically is acquired. If the same value is acquired continuously for a predetermined number of times or more based on (YES in S106), the format information management unit 21 determines the value as the format information of the detection target terminal, and the format information storage unit 30 (S107).

  Thereafter, the format detection of each input terminal is periodically executed according to the detection time set in S102.

  The format information of each input terminal stored in S107 is stored so that it can be used immediately when the display module switches the video signal or executes the video setting process.

  Note that there is no particular limitation on which input terminal and how long it is detected. Detection may be performed periodically with an equal length of time for all seven input terminals, or only specific input terminals may be detected with varying lengths.

  Next, the weight calculation process (S200) of the weight calculation module will be described in more detail using a specific example.

[About status information]
FIG. 9 is a diagram illustrating a specific example of the state information of each input terminal monitored by the state monitoring unit 24. The state information is stored in the state information storage unit 32.

  As shown in FIG. 9, the state information is stored in association with the seven input terminals included in the digital television 100. The weight calculation unit 25 calculates a weight value based on the state information stored in the following items of each input terminal stored in the state information storage unit 32.

  The item “connection destination” indicates the model of an external video output apparatus connected via the input terminal. For example, the connection destination of the analog video input terminal A1 (composite input terminal) is a VHS recorder.

  The item “viewing status” indicates whether or not the video signal from the input terminal is a video signal currently being displayed on the display module. In the example shown in FIG. 9, since “viewing” is indicated at the analog video input terminal A1, it is understood that the video signal currently being output is the video signal from the analog video input terminal A1. Being currently viewed is a video signal for which the format information should be most accurately grasped. Therefore, a high weight value is assigned to the input terminal being viewed so that the format is detected more accurately and frequently so that the video setting process can be smoothly followed.

  The item “cable insertion” indicates whether or not a cable is inserted into the input terminal. The fact that the cable is inserted is considered to be connected to an external video output device and accepting a video signal from the video output device. Therefore, it is possible to prepare for switching to the video signal by attaching a high weight value to the input terminal of the supply source of the video signal input to the digital television 100 so that the format is detected. On the contrary, when the cable is not inserted, the video signal is not input to the digital television 100, so that the format detection is unnecessary. Therefore, it is possible to set the weight value to be low or zero so that the resources of the detection module are effectively used for other input terminals.

  The item “selection frequency” indicates the number of times (viewing frequency) that the video signal from the input terminal has been selected by the user. The higher the numerical value, the more the user desires to output a video signal from the input terminal. An input terminal with a high selection frequency is likely to be instructed to switch the video signal by the user. Therefore, in order to perform the switching at high speed, the weight value may be set high so that the format detection is frequently performed. Is possible.

  Whether or not the user recognizes that the input terminal is highly important depending on which input terminal is used frequently and which input terminal image is required for fineness. Is shown. For example, a user who likes a game enables (with) preference registration for input terminals (in the example shown in FIG. 9, analog video input terminal A3 and digital video input terminal D2) connected to the game machine. It can be set in advance. In this way, since it is desired that the input terminal that the user considers important be switched at a higher speed with finer resolution, a high weight value is assigned to the input terminal with preference registration “Yes”. It is preferable.

  The item “dedicated input key” indicates whether or not high-speed switching to the input terminal is requested by a special purpose button or the like provided on the operation unit 2. As described above, it is possible to increase the frequency of format detection by giving a high weight value to an input terminal for which high-speed switching with a special purpose button is required, thereby realizing high-speed switching.

  The item “skip setting” indicates whether or not an input terminal that is not considered important by the user is excluded from the target of the periodic format detection process. That is, an input terminal with skip setting “present” means that the user thinks that periodic format detection is unnecessary. Therefore, it is desirable to set the weight value to low or zero for such an input terminal so that the resources of the detection module can be effectively used for format detection of other input terminals.

  The weight calculation unit 25 can calculate the weight value of each input terminal based on the state information of the state information storage unit 32 monitored and stored by the state monitoring unit 24. In the present embodiment, the state monitoring unit 24 updates the latest state information every time a state change event occurs. The weight calculation unit 25 updates the weight value every time the state information is updated. Also, the state information that affects the calculation of the weight value can be flexibly changed by the user according to his / her preference.

  According to the above configuration, since the weight value is appropriately maintained according to the latest state of the digital television 100 and according to the user's preference, the detection module is suitable for the latest state of the digital television 100. And the periodic format detection process of each input terminal can be executed at a frequency and timing that matches the user's preference.

  As a method for the weight calculation unit 25 to calculate the weight value using the state information, specifically, there are the following methods.

  The weight value of the input terminal currently being viewed can be set to 50%, and the remaining 50% can be divided according to the selection frequency of the user of each input terminal.

  Alternatively, for the remaining 50%, the weight value of the input terminal with the dedicated input button (for example, the game input dedicated terminal) is set to the next highest 30%, and the weight value of all the remaining input terminals is the remaining 20%. % Can be divided equally.

  Alternatively, with respect to the remaining 50%, the weight value of the input terminal that the user has registered for preference can be set to 30%, and the remaining 20% of the weight values of all the remaining input terminals can be equally divided. Here, among the remaining input terminals, input terminals for which cable insertion is not confirmed can be excluded so that a weight value is not assigned.

  In the present embodiment, the example in which seven input terminals are provided as the input path of the video signal output from the digital television 100 to the display unit 8 has been described. The present invention is not limited to the seven input terminals described above. For example, a path of a digital (analog) broadcast video signal output by decoding a broadcast wave received via a tuner and a demodulator (not shown) is also included in the input path as a fast switching target of the present invention.

[Flow of weight calculation processing]
FIG. 10 is a flowchart showing the flow of weight calculation processing of the weight calculation module. The weight calculation process is executed independently of the video display process of the display module and the periodic format detection process of the detection module.

  If the state monitoring unit 24 detects the occurrence of an event in which the state of the digital television 100 changes after the power of the digital television 100 is turned on (YES in S201), the state monitoring unit 24 determines what state change it has. The process proceeds to each step of determining whether or not.

  If the detected event is video signal switching (YES in S202), the status monitoring unit 24 sets a viewing flag on the input terminal after switching for “viewing status” shown in FIG. The value of “selection frequency” of the input terminal after switching is incremented by one (S203).

  When the detected event is the presence / absence detection of the cable insertion by the cable insertion detection unit 9 (NO in S202, YES in S204), the state monitoring unit 24 uses the input terminal detected by the cable insertion detection unit 9 as follows. The presence / absence of “cable insertion” is updated (S205).

  When the detected event is an input of a preference registration change instruction by the user (NO in S202 and S204, YES in S206), the state monitoring unit 24 determines whether “favorite registration” is present or not. Update according to the change instruction (S207).

  When the detected event is an input of an instruction to change the dedicated input key (NO in S202, S204, and S206, YES in S208), the state monitoring unit 24 determines whether the “dedicated input key” is present or not. Updating is performed according to the change instruction (S209).

  When the detected event is an input of a skip setting change instruction (NO in S202, S204, S206, and S208), the state monitoring unit 24 determines whether or not “skip setting” is present according to the change instruction. Update (S210).

  As described above, when the state information in the state information storage unit 32 is updated by the state monitoring unit 24, the weight calculation unit 25 acquires various state information about each input terminal from the state information storage unit 32 (S211). . Then, based on the acquired new state information, the weight value of each input terminal is recalculated (S212). Finally, the weight calculation unit 25 stores the calculated weight value in the weight information storage unit 31 for each input terminal (S213).

  Thereafter, until the power of the digital television 100 is turned off, the state monitoring unit 24 monitors the occurrence of a state change event. The state monitoring unit 24 repeats the process of updating the state information every time an event occurs, and the weight calculation unit 25 repeats the weight calculation process of recalculating the weight value every time the state information is updated.

  In the above description, the weight calculation unit 25 is configured to automatically recalculate the weight value in accordance with a change in the state information of the digital television 100, but is not limited thereto. For example, the user may be able to manually adjust the weight value of each input terminal shown in FIG. 5 on the operation screen for menu setting of the digital television 100. Alternatively, on the operation screen for menu setting, the user may be able to select which method of automatic calculation by the weight calculation unit 25 or manual adjustment by the user is used for deriving the weight value. .

  Specifically, the control unit 1 of the digital television 100 includes a user interface unit (user interface means) 26. The user interface unit 26 displays an operation screen such as a GUI screen on the display unit 8, and in response to various data stored in the storage unit 3 according to a user operation received from the operation unit 2 via the operation screen. Predetermined processing.

  The user interface unit 26 displays the weight value (FIG. 5) for each input route stored in the weight information storage unit 31 on the display unit 8 so that the user can edit it. When the user changes the weight value using the operation unit 2, the user interface unit 26 inputs the weight value stored in the weight information storage unit 31 via the operation unit 2. Change as specified by the user. In this way, the user can manually edit the automatically calculated weight value. In addition, the user interface unit 26 displays an operation screen for allowing the user to select between the automatic calculation mode of the weight value by the weight calculation unit 25 and the manual setting mode of the weight value by the user operation. The digital television 100 can be controlled so that the weight value is determined in the mode selected by the user.

  Hereinafter, the operation of each unit of the weight calculation module when the weight value is recalculated when the state of the digital television 100 changes will be described in detail using a specific example.

  For example, it is assumed that the weight value of the currently viewed analog video input terminal A1 is set to 70% and the weight value of the digital video input terminal D1 having the dedicated input key is set to 30% in the detection cycle of 1000 milliseconds. The detection target selection switch 10 switches to the digital video input terminal D1, and the video format detection unit 11 detects the format of the video signal of D1. After 300 milliseconds (30% of 1000 ms) have elapsed, the detection target selection switch 10 switches to the analog video input terminal A1 being viewed. Then, the video format detection unit 11 detects the format of the video signal A1. When 700 milliseconds (70% of 1000 ms) have elapsed, the detection target terminal is switched to D1 again.

  Here, when the video signal switching from the currently viewed analog video input terminal A1 to the digital video input terminal D1 occurs, various processes for switching the video signal from A1 to D1 are executed by the display module. At this time, the display module can switch the video signal at high speed using the format information of the digital video input terminal D1 detected in advance by the video format detector 11.

  Subsequently, as the input terminal being viewed is changed and the selection frequency of the digital video input terminal D1 is changed, the weight calculation unit 25 recalculates the weight value of each input terminal. For example, the weight value of the newly selected digital video input terminal D1 currently being viewed is set to 90%, and the weight value of the analog video input terminal A1 that has been viewed so far is changed to 10%. As a result, the detection module periodically performs format detection by switching the detection target terminal at 900 milliseconds, 100 milliseconds,.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

  Finally, each block of the digital television 100, in particular, the detection target selection switch 10, the video format detection unit 11, the detection timing control unit 20, the format information management unit 21, the video setting control unit 22, and the weight calculation unit 25 are included in the hardware. You may comprise by a logic and may implement | achieve by software using CPU as follows.

  That is, the digital television 100 includes a CPU (central processing unit) that executes instructions of a control program that realizes each function, a ROM (read only memory) that stores the program, a RAM (random access memory) that expands the program, A storage device (recording medium) such as a memory for storing the program and various data is provided. An object of the present invention is to provide a recording medium in which a program code (execution format program, intermediate code program, source program) of a control program of the digital television 100, which is software that realizes the functions described above, is recorded so as to be readable by a computer. This can also be achieved by supplying the digital television 100 and reading and executing the program code recorded on the recording medium by the computer (or CPU or MPU).

  Examples of the recording medium include tapes such as magnetic tapes and cassette tapes, magnetic disks such as floppy (registered trademark) disks / hard disks, and disks including optical disks such as CD-ROM / MO / MD / DVD / CD-R. Card system such as IC card, IC card (including memory card) / optical card, or semiconductor memory system such as mask ROM / EPROM / EEPROM / flash ROM.

  In addition, the digital television 100 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network. The communication network is not particularly limited. For example, the Internet, intranet, extranet, LAN, ISDN, VAN, CATV communication network, virtual private network, telephone line network, mobile communication network, satellite communication. A net or the like is available. Also, the transmission medium constituting the communication network is not particularly limited. For example, even in the case of wired such as IEEE 1394, USB, power line carrier, cable TV line, telephone line, ADSL line, etc., infrared rays such as IrDA and remote control, Bluetooth ( (Registered trademark), 802.11 wireless, HDR, mobile phone network, satellite line, terrestrial digital network, and the like can also be used. The present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.

  The video display device of the present invention can reduce the image output stress at the time of video switching because the video signal can be switched at high speed by detecting the video format in advance for video signals from a plurality of input terminals. In addition, user operability can be improved. Therefore, the present invention can be suitably used particularly in a video display device equipped with a plurality of tuners and a number of external input terminals.

It is a block diagram which shows the principal part structure of the digital television (video display apparatus) which concerns on embodiment of this invention. It is a block diagram which shows schematic structure of the digital television which concerns on embodiment of this invention. It is a flowchart which shows the flow of a process of each module with which the digital television concerning embodiment of this invention is provided. It is a figure which shows the specific example of the format information of each input terminal which the video format detection part of a digital television detects. It is a figure which shows the specific example of the weight value of each input terminal which the weight calculation part of a digital television calculates. It is a figure which shows the specific example of the detection specification information utilized when the detection timing control part of a digital television measures a detection timing. It is a timing chart which shows the timing of the operation | movement which each part of a detection module performs when a periodic format detection process is performed. It is a flowchart which shows the flow of the periodic format detection process of a detection module. It is a figure which shows the specific example of the status information of each input terminal which the status monitoring part of a digital television monitors. It is a flowchart which shows the flow of the weight calculation process of a weight calculation module.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Control part 2 Operation part 3 Memory | storage part 4 Analog video switch 5 AD converter 6 Digital video switch 7 Image | video adjustment control part 8 Display part 9 Cable insertion detection part 10 Detection object selection switch (detection object selection means)
11 Video format detector (format detector)
20 Detection timing control unit (detection timing control means)
21 Format Information Manager (Format Information Manager)
22 Video setting control unit (video setting control means)
23 video switching control unit 24 state monitoring unit 25 weight calculation unit (weight calculation means)
26 User interface section (user interface means)
30 Format information storage unit 31 Weight information storage unit 32 Status information storage unit 33 Detection specification storage unit 100 Digital television (video display device)
A1-A4 Analog video input terminal (input path)
D1 to D3 Digital video input terminal (input path)

Claims (10)

In a video display device comprising a plurality of video signal input paths, and switching a plurality of video signals input from the plurality of input paths to output to the display unit,
Format detection means for periodically detecting the format of each video signal for at least some of the plurality of video signals input to the video display device;
Format information management means for storing the format information of the video signal detected by the format detection means in the format information storage unit in association with the input path;
When a video signal switching event occurs, the video of the display module that outputs the video signal to the display unit according to the format information stored in the format information storage unit and associated with the input path of the video signal to be switched An image display device comprising image setting control means for performing setting.   A predetermined period when the format detection means selects one video signal input path to be detected from the plurality of input paths and performs format detection is based on a weight value determined for each input path. The video display device according to claim 1, further comprising detection timing control means for determining the timing.   It comprises a detection target selection means for switching a video signal input path to be detected from the plurality of input paths in a predetermined period and transmitting the detection target video signal to the format detection means. The video display device according to claim 1 or 2.   The video display device according to claim 2, further comprising weight calculation means for calculating the weight value based on status information indicating a status of each input path.   5. The video display device according to claim 2, further comprising user interface means for displaying an operation screen for the user to set the weight value on the display unit.   The user interface means further selects to the user whether to use an automatic calculation mode in which the weight value is a value calculated by the weight calculation means or a manual setting mode in which the user sets the weight value. The video display device according to claim 5, wherein an operation screen for causing the display to be displayed is displayed on the display unit. The format detection means includes
For each input path, format detection is performed a plurality of times at predetermined intervals within the period defined in the input path.
The format information management means includes
7. When the same information is detected continuously for a predetermined number of times or more for the input path, the detected information is stored in the format information storage unit as format information of the input path. The video display device according to any one of the above. A control method of a video display device comprising a plurality of video signal input paths, and switching a plurality of video signals input from the plurality of input paths to output to a display unit,
A format detection step for periodically detecting the format of each video signal for at least some of the plurality of video signals input to the video display device;
Format information management step for storing the format information of the video signal detected in the format detection step in the format information storage unit in association with the input path;
When a video signal switching event occurs, the video of the display module that outputs the video signal to the display unit according to the format information stored in the format information storage unit and associated with the input path of the video signal to be switched A video display control method comprising: a video setting control step for performing setting.   The control program for functioning a computer as each means of the video display apparatus of any one of Claim 1-7.   A computer-readable recording medium on which the control program according to claim 9 is recorded.

Images