JP2005275046A - Picture display device and picture display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform proper control in response to whether a user is looking at a display part or not. <P>SOLUTION: This picture display device is a portable television terminal 100 equipped with a display part 103 which displays pictures and moreover the portable terminal 100 is equipped with; a direction detecting device 102 which detects the direction of the display part 103; and a control part 101 which compares the direction of the display part 103 with the direction of the head part of the user and performs control based the compared result. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a video display device and a video display method for displaying video.

Assuming TV viewing on a mobile TV terminal, the screen size is small and it is used while moving, so you can only listen to the audio of the program with headphones and watch the screen only when an interesting scene begins. Can be considered. For example,
(B) Listen to a music program while commuting and watch the screen only when a favorite artist appears. It can be used to look at the screen.

  However, since the playback of TV images consumes a large amount of power, a portable TV terminal that performs playback by supplying power from a battery has a problem that the playback time is short. On the other hand, a method of performing power saving control by opening / closing a power saving button or folding mobile phone has been considered (Prior Art 1). In addition, there is a method of detecting the orientation of the user's face by a sensor attached to the head and estimating that the user is not looking and performing power saving control (see, for example, Patent Document 1). This is a technique in which a sensor is mounted on a scouter and power-saving control is performed from the operator's head tilt, line of sight, etc. (Prior Art 2). Furthermore, there is a method in which a camera is mounted on a television terminal and power saving control is performed by detecting a face direction and a line-of-sight direction by image recognition (see, for example, Patent Document 2). This is to detect the line of sight (face orientation) by image processing of the output of a camera mounted on a portable terminal and perform power saving control (Prior Art 3).

  Also, when watching live sports programs such as soccer or baseball on a mobile device while moving on a train or bus, you can turn around reflectively or move your hands due to external factors such as shaking or contact with people. Sometimes. In such a case, there is a possibility that a user such as a scoring scene may miss a scene that is most interesting. On the other hand, for example, a method of providing a recording button on a portable television terminal and controlling the recording in conjunction with the operation of this recording button can be considered (prior art 4). Furthermore, there is a recording control method in which a program within a time period during which viewing has been hindered is automatically recorded and automatically played back when the program becomes viewable (see, for example, Patent Document 3). This is a method in which automatic recording is started when a mobile TV terminal receives an incoming call and a call is made, and is automatically reproduced when the call ends (Prior Art 5).

JP-A-9-190245 Japanese Patent Laid-Open No. 11-288259 JP 2003-329459 A

  However, in the portable television terminal of the prior art 1, as shown in the usage example (b), the button input is generated during the work, so the switching button is used during the work using both hands. I cannot press and I cannot watch the TV screen. Further, even in the case of the usage example (A), it is difficult to press the power saving button in a short time of looking back, and a time during which the power saving state is not generated occurs. In the power saving control method of the prior art 2, since it is not considered that the screen display mounting moves, it is impossible to accurately detect the orientation of the user and the face of the screen. In the power saving control method of the prior art 3, since the amount of power required for image processing is much smaller than the power consumption of the screen in a large screen television, a power saving effect can be expected. In the case of a small screen, the ratio of power consumed by the camera and image processing is large, and there is a risk that power is consumed. For this reason, it is difficult to ensure the expected accuracy with a weak hardware specification such as a portable terminal. Furthermore, the specification of the portable terminal is assumed to be outdoors, and at night, it is difficult to implement due to a sudden change in the amount of light.

  In the recording control method of the prior art 4, it is difficult to predict external factors such as train shaking and human contact, and when the user operates reflexively, the recording button cannot be pressed, An oversight will occur. Further, in the recording control method of the prior art 5, when viewing is hindered while receiving a command from the outside during driving or talking, recording can be started by the command from the outside. However, the above-mentioned method cannot detect looking away or reflexively looking back, resulting in overlooking.

  The present invention has been made in view of the above circumstances, and provides a video display device and a video display method capable of performing appropriate control depending on whether or not a user is looking at a display unit. is there.

  The video display device of the present invention is a video display device including a display unit for displaying video, and the detection means for detecting the orientation of the display unit is compared with the orientation of the display unit and the orientation of the user's head. And a control unit that performs control based on the comparison result. According to the above configuration, since the comparison unit that compares the orientation of the display unit and the orientation of the head can be provided, the positional relationship between the orientation of the user's head and the orientation of the display unit can be grasped. Appropriate control can be performed depending on whether or not the user is watching.

  In the video display device of the present invention, the control means shifts the normal power mode to the power saving mode based on the comparison result. According to the above configuration, by providing the comparison unit that compares the orientation of the display unit and the orientation of the head, the user can grasp the positional relationship between the orientation of the user's head and the orientation of the display unit. Depending on whether or not the user is watching, it is possible to appropriately shift to the power saving mode.

  In the video display device of the present invention, the control means detects an incoming call to the telephone or an outgoing call from the telephone and shifts to the power saving mode. According to the above configuration, the control means detects the incoming call to the telephone or the outgoing call from the telephone and controls the display unit, thereby making a call regardless of the positional relationship between the head direction of the user and the direction of the display unit. Power consumption inside can be suppressed.

  The video display device of the present invention further comprises receiving means for receiving a television broadcast, and recording / playback means for recording and playing back a television video, and the control means sets the recording / playback means to the TV based on the comparison result. The video is recorded. According to the above configuration, by providing the comparison unit that compares the orientation of the display unit and the orientation of the head, the television image is recorded in consideration of the positional relationship between the orientation of the user's head and the orientation of the display unit. Thus, the scene can be prevented from being overlooked.

  In the video display device of the present invention, the control means causes the recording / reproducing means to perform time shift reproduction based on the comparison result. According to the above configuration, since the control unit causes the recording / reproducing unit to perform time shift reproduction based on the comparison result, the television image can be reproduced in consideration of the positional relationship between the head direction of the user and the direction of the display unit. A user who has not seen the display unit can see the video that he / she missed when viewing the display unit again.

  The video display device of the present invention further includes timing control means for controlling the time shift reproduction start time by a user operation in preference to the comparison result. According to the above configuration, the playback start time can be arbitrarily controlled by controlling the time shift playback start time by a user operation in preference to the comparison result.

  The video display device of the present invention further includes a deletion unit that deletes recorded data, and the control unit causes the recording / playback unit to stop the recording operation after a certain period of time has elapsed from the user operation, and the deletion unit performs the recording. Data is deleted. According to the above configuration, when a video not desired by the user is automatically recorded by causing the recording / playback unit to stop the recording operation and causing the deletion unit to delete the recording data after a certain period of time has elapsed since the user operation. Even if it exists, since it is not necessary for the user to stop recording and delete the recorded video data, usability is improved.

  In the video display device of the present invention, the control means detects the incoming call to the telephone or the outgoing call from the telephone and controls the recording / reproducing means. In the video display device according to the present invention, the control means detects an incoming call to the telephone or an outgoing call from the telephone and causes the recording / playback means to record a television video. In the video display device of the present invention, the control means detects the incoming call to the telephone or the outgoing call from the telephone and stops the reproduction operation of the recording / reproducing means.

  According to the above configuration, the control means detects the incoming call to the telephone or the outgoing call from the telephone and controls the recording / reproducing means, thereby making a call regardless of the positional relationship between the head orientation of the user and the orientation of the display section. The recording / playback operation can be controlled to prevent the scene from being overlooked.

  Furthermore, the video display method of the present invention is a video display method for displaying video on a display unit, which detects the orientation of the display unit, compares the orientation of the display unit with the orientation of the user's head, Control is performed based on the comparison result.

  According to the present invention, by comparing the orientation of the display unit and the orientation of the head, it is possible to grasp the positional relationship between the orientation of the user's head and the orientation of the display unit. Appropriate control can be performed depending on whether or not.

  FIG. 1 is a block diagram showing a configuration of a video display system for explaining an embodiment of the present invention. In FIG. 1, the video display system includes a portable television terminal 100 and a head-mounted device 200. In the following description, it is assumed that the portable television terminal 100 has a telephone communication function.

  The portable TV terminal 100 is a small-sized and easy-to-carry video playback terminal, and is connected to a headphone 200 that is worn on the user's head and has a heading detection device 202 that detects the heading of the head. It operates in power mode. The mobile TV terminal 100 acquires a display unit 103 that displays an image, an orientation detection device 102 that detects the orientation of the display unit 103, the orientation of the user's head, and the orientation of the display unit 103 and the orientation of the head. The control unit 101 that shifts to the power saving mode based on the comparison result, the antenna 107 that receives the radio wave of the television, the tuner 104 that extracts the specified frequency signal from the radio wave of the television, and the signal from the tuner 104 An audio processing device 105 that converts to audio and a video processing circuit 106 that converts a signal from the tuner 104 into video are provided. The mobile TV terminal may be a mobile phone terminal, a PDA (Personal Digital Assistant), or the like. Note that the azimuth includes an azimuth in a horizontal plane and an azimuth (tilt angle) in a vertical plane, and the azimuth detection device 202 particularly detects an azimuth in the horizontal plane.

  The head-mounted device 200 is a hat, glasses, headphones, or the like that is mounted on the user's head (including the face), and the headphones 200 will be described below as an example. The headphones 200 include a speaker 201 that outputs sound and an orientation detection device 202 that detects the orientation of the user's head.

  In the mobile TV terminal 100, the orientation detection device 102 is attached to the mobile TV terminal 100 itself and automatically detects the orientation of the mobile TV terminal 100. As the azimuth detecting device 102, a magnetic azimuth sensor (electronic compass), a gyro, or the like is used.

  The display unit 103 is a display that displays video such as a television program. The display unit 103 converts video information such as a television program processed by the video processing circuit 106 into a signal suitable for screen display and outputs the signal. The tuner 103 receives TV radio waves through the antenna 107, and a video signal in the TV radio waves is converted into a signal suitable for video output by the video processing circuit 106 and supplied to the display unit 103. On the other hand, the audio signal in the TV radio wave is converted into a signal suitable for audio output by the audio processing circuit 105 and supplied to the speaker 201 of the headphone 200.

  The control unit 101 compares the azimuth information from the azimuth detection device 102 with the azimuth information from the headphones 200 to determine whether or not they match, and displays a video on the display unit 103 based on the determination result. Control such as stop control or stop release control is performed to shift to the power saving mode.

  In the headphone 200, the speaker 201 outputs sound such as a television program based on a signal from the sound processing circuit 105. The direction detection device 202 is attached to the headphones 200 and detects the direction of the headphones 200 (the direction of the head of the user wearing the headphones 200). As the azimuth detecting device 200, a magnetic sensor, a gyro sensor, an angular acceleration sensor, an acceleration sensor, a double integrator, or the like is used.

  FIG. 2 is a flowchart showing a control flow of the video display system shown in FIG. The user correctly wears the headphone 200 connected to the portable TV terminal 100 via a cable (cord) on the head. Also, a predetermined operation such as turning on the power switch is performed. In the portable television terminal 100, the tuner 104 receives broadcast radio waves of the television program via the antenna 107, and after the video signal is processed by the video processing circuit 106, the display unit 103 displays the video. On the other hand, the audio signal is output from the speaker 201 of the headphones 200.

  The direction detection device 102 detects the direction of the portable television terminal 100 (step S101), and the direction detection device 202 detects the direction of the headphones 200 (user's head) (step S102). The control unit 101 compares the azimuth of the display unit 103 with the azimuth of the head, detects whether or not both positions match (step S103), and determines whether or not the user is looking at the display screen. As a result of the determination, if both positions coincide with each other, the video display is continued as it is when the video is being displayed (step S104). If no video is displayed, video display is started (step S106). On the other hand, if it is determined by the control unit 101 that both positions do not match (step S103), if the video is being displayed, the video display is stopped (step S107). If the video is not displayed, the video non-display state is continued as it is.

  Therefore, when it is determined from the positional relationship between the orientation of the display unit 103 and the orientation of the head that the user is not looking at the display screen, the generation and display of the video is stopped, and only audio is output (power saving) Mode). Thereby, the power consumption of the portable television terminal 100 can be suppressed. When the user views the display screen again, the video screen display is automatically resumed.

  FIG. 3 is a block diagram showing a modification of the video table display system shown in FIG. In FIG. 3, inclination angle detection line devices 111 and 211 are additionally installed in the mobile TV terminal 100 and the headphones 200 of FIG. The tilt angle detection devices 111 and 211 have a function of detecting the vertical angles of the mobile TV terminal 100 and the headphones 200. With this function, the control unit 101 compares the vertical angles (inclination angles) of the mobile TV terminal 100 and the headphones 200, and determines whether or not they also match in the vertical direction. Thereby, the screen display of the video can be stopped regardless of which of the horizontal direction and the inclination angle does not match. Therefore, even when the user keeps an eye on the display screen in the vertical direction, the screen display is stopped, and more sufficient power saving can be realized. As the tilt angle detection device 211, a well-known tilt sensor or a triaxial azimuth sensor is used.

  FIG. 4 shows a block diagram of another modification of the video display system shown in FIG. In FIG. 4, distance detection means 212 for detecting the distance from the portable television terminal 100 is additionally installed in the headphones 200 of FIG. 1. The distance detection unit 212 has a function of detecting the distance from the number of windings of the cord connecting the mobile TV terminal 100 and the headphones 200. An optical distance sensor or the like may be used as the distance detection unit 212.

  According to this configuration, the distance between the portable TV terminal 100 and the headphones 100 is acquired from the number of windings of the cord and the like, and the allowable range (error) in the matching determination of both positions is dynamically changed according to this distance. Can do. For example, the tolerance can be reduced when the distance is short, and the tolerance is increased when the distance is long.

  FIG. 5 shows a block diagram of another modification of the video display system shown in FIG. In FIG. 5, wireless transmission / reception devices 112 and 213 for wireless communication are additionally installed in the mobile TV terminal 100 and the headphones 200 of FIG. 1, respectively. The wireless transmission / reception devices 112 and 213 transmit and receive audio signals and azimuth detection signals between the portable TV terminal 100 and the headphones 200 by cableless wireless communication such as infrared, Bluetooth, and wireless LAN.

  Even when the user moves to a distance where the radio wave does not reach the headphones 200 or moves to a place where the radio wave does not reach due to a radio wave obstruction, the control unit 101 detects the radio wave interruption. Thus, the video display by the display unit 103 can be stopped. Accordingly, it is possible to avoid power consumption by avoiding screen display when the video signal cannot be received.

  FIG. 6 shows a block diagram of another modification of the video display system shown in FIG. In FIG. 6, in place of the tuner 104 of FIG. 1, a memory 115 storing moving image content is installed. In this modification, a moving image stored in the memory 115 is reproduced, and when the orientation of the display unit 103 and the orientation of the head do not match, the display of the reproduced video of the moving image can be stopped. Thereby, power saving can be realized.

  In the portable television terminal 100 having a telephone communication function, the control unit 101 may control the display unit 103 by detecting an incoming call to the own terminal or a call from the own terminal. With this configuration, power consumption during a call can be suppressed regardless of the positional relationship between the orientation of the user's head and the orientation of the display unit 103. Even if the portable TV terminal 100 does not have a telephone communication function, it may have a function of detecting incoming calls to the telephone or outgoing calls from the telephone. In this case, the telephone communication function itself may be provided in headphones or connected to an external telephone.

  Note that, from the normal power mode to the power saving mode, there are video signal processing and video display stop, and in the liquid crystal display, the backlight is turned off. Further, by reducing the number of playback frames of a moving image, it is possible to perform power saving control while playing back the video.

  FIG. 7 is a block diagram showing a configuration of a video display system for explaining another embodiment of the present invention. In the following, an example of preventing a scene such as a television program from being overlooked when the user takes a look away from the display screen along with the transition to the power saving mode will be described. In this embodiment, time shift reproduction is executed. Time-shifted reproduction is to reproduce a recorded part while continuing to record (record) a television image. According to the video display system shown in FIG. 7, when recording is started after the display unit 103 and the head are in the same direction and the directions are matched again, time-shift playback is performed if an instruction from the user is given. Time shift playback control can be performed in which recording is stopped and normal viewing is performed if no instruction is given.

  In FIG. 7, a memory 121 and an encoder 122 are additionally installed in the portable television terminal 100 shown in FIG. The memory 121 stores recorded information. The encoder 122 has a function of creating a recording file from video and audio streaming and storing it in the memory 121. The memory 121 and the encoder 122 constitute a recording / playback unit 140 that records and plays back TV images. Also, the control unit 101 shown in FIG. 7 causes the recording / playback unit 140 to record a television image based on the non-respective results of the orientation of the display unit 103 and the orientation of the user's head.

  FIG. 8 is a flowchart showing the operation of the video display system shown in FIG. 7 and shows a recording / playback control procedure by the control unit 101 of the portable television terminal 100. First, the direction detection device 102 detects the direction of the portable television terminal 100 (step S101), and the direction detection device 202 detects the direction of the headphones 200 (step S102). The control unit 101 compares these azimuths to detect whether or not both positions match (step S103), and determines whether or not the user is looking at the display screen. As a result of the determination, if both positions match and the image is being displayed, the image display is continued as it is (step S104). If no video is displayed, video display is started (step S106). Next, it is checked whether or not recording is in progress (step S111). If recording is not in progress, the processing from step S101 is re-executed. If recording is in progress, it is determined whether or not time-shifted playback is in progress (step S111). S112). If the time shift reproduction is being performed, the processing from step S101 is executed, and if not the time shift reproduction, the time shift reproduction is started.

  On the other hand, if it is determined in step S103 that the orientation (azimuth) of the display unit 103 and the head does not match, it is checked whether the video is being displayed (step S105). The process returns to S101 and the subsequent steps. When the video is being displayed, the video display is stopped (step S107) and the mode is shifted to the power saving mode. At this time, it is checked whether or not recording is in progress (step S114). If recording is not in progress, recording is started by the encoder 122 (step S117). On the other hand, if recording is in progress, it is checked whether or not time-shifted playback is in effect (step S115). If time-shifted playback is in progress, video playback is temporarily stopped (step S116), recording continues, and the processing from step S101 onward is repeated again.

  FIG. 9 is a diagram for explaining the operation of the control unit shown in FIG. 8, and the states of the display unit 103, the speaker 201, and the presence / absence of recording with respect to the orientation determination in step S103 of the flowchart shown in FIG. It shows how it changes with time. As shown in FIG. 9, at time t1, the user views a television program on the display screen. In this case, television reception / reproduction is performed as usual. At time t2, when the user turns sideways and looks away from the display screen, the recording is started, but the currently received television sound is reproduced. At time t3, when the user looks at the display screen again, time shift reproduction is started. Then, during the time shift reproduction, when the user turns sideways at time t4, the time shift reproduction is temporarily stopped. At time t5, when the user views the display screen, the time shift reproduction is resumed.

  FIG. 10 shows a block diagram of another modification of the video table system shown in FIG. In FIG. 10, an input device 131, a timer 132, a video display start time memory 133, and a video display stop time memory 134 are additionally installed in the mobile TV terminal 100 shown in FIG. The input device 131 is used to start time-shifted playback by a button operation by the user, and the time-shifted playback start time is given priority over the comparison result between the orientation of the display unit 103 and the orientation of the user's head. It is controlled by operation. The timer 132 is a clock for measuring time. The video display start time memory 133 and the video display stop time memory 134 store the time when the video display is started and the time when the video display is stopped, respectively.

  FIG. 11 is a flowchart showing the operation of the video display system shown in FIG. 10, and shows a recording / playback control procedure by the control unit 101 of the portable television terminal 100 when a user operation is involved. First, the direction detection device 102 detects the direction of the portable television terminal 100 (step S101), and the direction detection device 202 detects the direction of the headphones 200 (step S102). The control unit 101 compares these directions and detects whether or not they match (step S103), and determines whether or not the user is looking at the display screen. As a result of the determination, if both positions coincide with each other, the video display is continued as it is when the video is being displayed (step S104). If no video is displayed, video display is started (step S106). At this time, the video display start time is written in the video start time memory 133 (step S121).

  Next, if the video display start has been written or if the video is being displayed, it is checked whether recording is in progress (step S111). If recording is not in progress, the processing from step S101 is repeated again. If recording is in progress, it is checked whether a request for time shift reproduction has been made (step S123). When there is a request for time shift reproduction, time shift reproduction is started from the point where it was recorded in the video display stop time memory 134 (step S124), and the processing from step S101 onward is repeated. On the other hand, if there is no request for time shift reproduction, it is checked whether or not time shift reproduction is in progress (step S112). If time shift reproduction is in progress, processing from step S101 is executed. On the other hand, when the time shift reproduction is not being performed, whether or not the recording stop time has elapsed is checked by comparing the time recorded in the video display start time memory 133 with the time of the timer 132 (step S125).

  If it is not the recording stop time, the recording is stopped (step S126). In this way, when the recording is stopped and when the time shift reproduction is in progress, the processing from step S101 is repeated. If it is determined in step S103 that both positions do not match, it is checked whether or not the video is being displayed (step S103). If the video is not being displayed, the processing returns to step S101 and the subsequent steps. The video display is stopped (step S107). At this time, the video display stop time in the video display stop time memory 134 is updated (step S122), and then it is determined whether or not recording is in progress (step S114). When the recording is in progress, the processing from step S101 is repeated, and when the recording is not in progress, the recording is started (step S117).

  12 is a diagram for explaining the operation of the control unit shown in FIG. 11, and FIGS. 13 to 18 are explanatory diagrams of the operation of the control unit using the flowchart shown in FIG. FIG. 12 shows how the states of the display unit 103, the speaker 201, and the presence / absence of recording change over time with respect to the orientation determination in step S103 and the time shift reproduction request determination in step S123 of the flowchart shown in FIG. First, at time t1, the user views a television program on the display surface. In this case, the control procedure is executed in the direction of the arrow shown in the flowchart of FIG. Since the orientations of the portable TV terminal 100 and the headphones 200 acquired in steps S101 and S102 coincide with each other (step S103), the video of the TV program continues to be displayed as usual. At time t2, when the user turns sideways, the control procedure is executed in the direction of the arrow shown in the flowchart of FIG. Here, since the respective directions of the mobile TV terminal 100 and the headphones 200 acquired in steps S101 and S102 do not match (step S103), the video display is stopped (step S107). Further, the time of the timer 132 is written in the video display stop time memory 134 (step S122). If recording is not currently being performed, recording is started (step S117). At this time, the current television sound can be heard. Thereafter, the processing from step S101 onward is repeated until the respective directions match.

  At time t3, when the user looks at the display screen again, the orientations coincide with each other (step S103), and the video display that has been stopped so far is started as indicated by the arrow in FIG. 15 (step S106). . At this time, the video display start time memory 133 updates the start time of the video display (step S121), and whether or not a predetermined recording stop time (for example, 5 seconds) has elapsed without performing time-shift playback. After checking (step S125), if no time shift reproduction request has passed, the recording is automatically stopped (step S126), and the recorded file is deleted. At time t4, when the user turns sideways, the video display is stopped (step S107) and recording is automatically started (step S117) in the same manner as the arrow direction shown in FIG.

  At time t5, when the user looks at the display screen again and starts the time shift reproduction, when the button of the input device 131 is pressed within the recording stop time, the time shift reproduction request is transmitted to the control unit 101, and the arrow in the flowchart of FIG. In this procedure, the time-shifted reproduction is started from the time t4 when the camera was in the recording state (step S111) and turned sideways last time (steps S123 and S124). At time t6, when turning sideways during such time-shifted reproduction, the video display is stopped by the procedure in the arrow direction in the flowchart of FIG. 17 (step S107), and the video display stop time is updated (step S122). During recording, only audio is time-shifted. At time t7, when the user looks at the display screen again, video display is resumed according to the procedure shown by the arrow in FIG. 18 (step S106), and video and audio time-shift playback is performed. Then, at time t8, when turning to the side again, as shown by the arrow in FIG. 17, only the video display is stopped, and the time-shift playback with only the audio is performed. Further, when the user looks at the display screen at time t9 and presses the button of the input device 131 for time shift reproduction, the time from the time t8 when the previous user turned sideways in the procedure of the arrow direction in FIG. Shift playback is started.

  As described above, according to the video display system shown in FIG. 7, by comparing the orientation of the display unit 103 with the orientation of the user's head, the positional relationship between the orientation of the head and the orientation of the display unit is obtained. If it is controlled to record a television image in consideration, it is possible to control overlooking of a scene. In addition, since the recording / playback control is performed by detecting that the positional relationship between the orientation of the user's head and the orientation of the display unit has changed, it is impeded that the display unit is instantaneously viewed due to the reflective operation of the user. Even if it is a case, it is possible to prevent the scene from being overlooked.

  In the recording / playback control for preventing the above-described scene from being overlooked, when the button of the input device 131 is pressed a plurality of times, the time-shifted playback is started retroactively to the time when the past video for the number of times pressed is stopped. Can do. In this case, the video stop time is not overwritten in the video display stop time memory 134 executed in step S122, but is added to leave a history. Further, when the time shift playback is started from the video display stop time executed in step S124, the time shift control from the video stop time immediately before the video content playback time is performed.

  FIG. 19 is a diagram showing the concept of power saving control and recording / playback control according to an embodiment of the present invention. The power saving control and recording control of the portable TV terminal 100 are controlled by the portable TV terminal 100 and the user's It is shown schematically that it is carried out according to the orientation of the part.

  As described above, according to the video display system of the present embodiment, the control unit 101 compares the orientation of the display unit 103 with the orientation of the user's head, so Therefore, it is possible to appropriately shift to the power saving mode depending on whether the user is viewing the display unit 103 or not. Further, according to the video display system of the present embodiment, the control unit 101 compares the orientation of the display unit 103 with the orientation of the user's head, so that the positional relationship between the orientation of the head and the orientation of the display unit 103 is obtained. Therefore, it is possible to prevent a scene from being overlooked.

  Note that the mobile TV terminal 100 includes a deletion unit that deletes the recorded data, and the control unit 101 causes the recording / playback unit 140 to stop the recording operation after a certain period of time has elapsed from the user operation, and causes the deletion unit to delete the recorded data. Also good. With this configuration, even when a video that is not desired by the user is automatically recorded, it is not necessary for the user to stop recording and delete the recorded video data.

  In the portable television terminal 100 having a telephone communication function, the control unit 101 may control the display unit 103 by detecting an incoming call to the own terminal or a call from the own terminal. Thereby, power consumption during a call can be suppressed regardless of the positional relationship between the orientation of the user's head and the orientation of the display unit 103. Further, the control unit 101 may control the recording / reproducing means 140 by detecting an incoming call to the own terminal or a call from the own terminal. Specifically, even if the control unit 101 detects an incoming call to the own terminal or an outgoing call from the own terminal and causes the recording / playback unit 140 to record a TV image or stops the playback operation of the recording / playback unit 140. Good. Thereby, the recording / playback operation during a call can be controlled regardless of the positional relationship between the orientation of the user's head and the orientation of the display unit 103, thereby preventing the scene from being overlooked. Even if the portable TV terminal 100 does not have a telephone communication function, it may have a function of detecting incoming calls to the telephone or outgoing calls from the telephone. In this case, the telephone communication function itself may be provided in headphones or connected to an external telephone. Note that the control unit 101 may detect not only incoming / outgoing calls but also incoming / outgoing mails, or may perform similar control by detecting the activation of an alarm.

  Moreover, although the case where the control unit 101 compares the azimuth of the display unit 103 with the azimuth of the head and performs control based on whether both positions coincide with each other has been described, a step is performed based on the comparison result of the azimuth. Specifically, power saving control and recording / playback control may be performed.

  Further, the example in which the power saving control and the recording / playback control are performed by comparing the orientation of the display unit 103 with the orientation of the head has been described. For example, when playing a game on a video display device, the orientation of the display unit and the head Other controls such as temporarily stopping the game by comparing with the direction of the part may be performed. Further, the time during which the orientation of the display unit and the orientation of the head coincide with each other may be measured, and when this time exceeds a specified time, the reproduction of the video may be stopped. Thereby, the fall of visual acuity can be prevented.

  In the above description, the example in which the orientation of the user's head is detected by the direction detection device 202 attached to the headphones 200 has been described, but means for detecting the orientation of the head may be provided anywhere. For example, the orientation of the head may be detected by other methods such as providing orientation detection means in a portable television terminal (video display device) and detecting the orientation of the user's head using image recognition technology.

  Since the present invention can grasp the positional relationship between the orientation of the user's head and the orientation of the display unit by comparing the orientation of the display unit and the orientation of the head, whether or not the user is looking at the display unit Accordingly, the present invention has an effect that appropriate control can be performed, and is useful for a video display device and a video display method for displaying video.

The block diagram which shows the structure of the video display system for describing one Embodiment of this invention The flowchart which shows the control flow of the video display system shown in FIG. The block diagram which shows the modification of the image | video table display system shown in FIG. The block diagram of the other modification of the video display system shown in FIG. The block diagram of the other modification of the video display system shown in FIG. The block diagram of the other modification of the video display system shown in FIG. The block diagram which shows the structure of the video display system for demonstrating other embodiment of this invention. The flowchart which shows operation | movement of the video display system shown in FIG. The figure for demonstrating operation | movement of the control part shown in FIG. Block diagram of another modification of the video table system shown in FIG. The flowchart which shows operation | movement of the video display system shown in FIG. The figure for demonstrating operation | movement of the control part shown in FIG. Operation explanatory diagram of the control unit using the flowchart shown in FIG. Operation explanatory diagram of the control unit using the flowchart shown in FIG. Operation explanatory diagram of the control unit using the flowchart shown in FIG. Operation explanatory diagram of the control unit using the flowchart shown in FIG. Operation explanatory diagram of the control unit using the flowchart shown in FIG. Operation explanatory diagram of the control unit using the flowchart shown in FIG. The figure which shows the concept of the power saving control of one Embodiment of this invention, and video recording / reproducing control

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Portable television terminal 101 Control part 102 Direction detection apparatus 103 Display part 104 Tuner 105 Audio | voice processing circuit 106 Video processing circuit 107 Antenna 111 Inclination angle detection apparatus 112 Wireless transmission / reception apparatus 115,121 Memory 122 Encoder 132 Timer 133 Video display start time memory 134 Video display stop time memory 140 Recording / playback means 200 Headphone 201 Speaker 202 Direction detection device 211 Inclination angle detection device 212 Distance detection means 213 Wireless transmission / reception device

Claims (11)

A video display device comprising a display unit for displaying video,
Detecting means for detecting the orientation of the display unit;
Comparison means for comparing the orientation of the display unit and the orientation of the user's head;
Control means for performing control based on the comparison result;
A video display device comprising: The video display device according to claim 1,
The control means is a video display device that shifts a normal power mode to a power saving mode based on a comparison result. The video display device according to claim 2,
The control means is a video display device that detects an incoming call to the telephone or an outgoing call from the telephone and shifts to the power saving mode. The video display device according to claim 1,
Receiving means for receiving a television broadcast;
Recording and playback means for recording and playing back TV images,
The control means is a video display device for causing the recording / playback means to record a television video based on a comparison result. The video display device according to claim 4,
The video display apparatus in which the control means causes the recording / playback means to perform time-shift playback based on the comparison result. The video display device according to claim 5,
A video display device comprising timing control means for controlling a time shift reproduction start time by a user operation in preference to a comparison result. The video display device according to claim 6,
It has a deletion means to delete recorded data,
The video display apparatus in which the control unit causes the recording / playback unit to stop a recording operation and the deletion unit to delete recorded data after a predetermined period of time has elapsed since the user operation. The video display device according to claim 4,
The video display apparatus for controlling the recording / reproducing means by detecting the incoming call to the telephone or the outgoing call from the telephone. The video display device according to claim 8,
The video display apparatus in which the control means detects an incoming call to the telephone or a transmission from the telephone and causes the recording / playback means to record a television video. The video display device according to claim 8,
The video display apparatus, wherein the control means detects an incoming call to the telephone or an outgoing call from the telephone and stops the reproduction operation of the recording / reproducing means. An image display method for displaying an image on a display unit,
Detecting the orientation of the display unit,
Compare the orientation of the display unit with the orientation of the user's head,
An image display method for performing control based on a comparison result.

Images