JP2015039126A - Display apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display apparatus capable of reducing adverse effects on user's eyes without reducing convenience.SOLUTION: A television image receiving apparatus includes a display part 104 for displaying images and a human body sensor 109 attached to a front of the display part 104 to detect a distance up to a human body H in a living room. When the human body H is not detected in a first area A1 within a predetermined range from the human body sensor 109 and in a second area A1 which is the outside of the first area A1, a display state of the display part 104 is set to a reference display mode with predetermined luminance, and when the human body H is detected in the first area A1, the display state of the display part 104 is set to a first low luminance mode with luminance lower than that of the reference display mode. When the human body H enters from the outside of the second area A2 into the second area A2, the display state of the display part 104 is set a second low luminance mode with luminance between the reference display mode and the first low luminance mode, and when the human body H enters from the first area A1 to the second area A2, the first low luminance mode is maintained.

Description

  The present invention relates to a display device provided with a human body sensor.

  Patent Document 1 discloses a display device including a display unit and a human body sensor. The display unit displays a video such as a broadcast program. The human body sensor has an imaging unit, photographs a human body in a living room, and detects the distance to the human body by image processing.

  In the display device having the above configuration, when the human body approaches the display unit and the distance between the human body and the display unit is close to the display unit while displaying the video on the display unit, the luminance of the video on the display unit is set. Reduce. Thereby, it is possible to urge the user who approaches the display unit to move away from the closest distance from the display unit.

JP 2000-152109 A

  However, according to the conventional display device described above, the brightness of the video is lowered when the user approaches the display unit. At this time, if the luminance is too low, there is a problem in that the user cannot discriminate part of the video and cannot grasp the video content, which is inconvenient. In addition, if the brightness of the image is too high, the user can view the image at a close distance with respect to the display unit, which has a problem of adversely affecting the eyes of the user.

  An object of the present invention is to provide a display device that can reduce adverse effects on the eyes of the user without reducing convenience.

To achieve the above object, the present invention provides a display device including a display unit that displays an image, and a human body sensor that is attached to the front surface of the display unit and detects a distance to a human body in a room.
When the human body is not detected in the first area within a predetermined distance from the human body sensor and in the second area outside the first area, the display state of the display unit is set to a standard display mode with a predetermined brightness, When the human body is detected, the display state of the display unit is changed to the first low luminance mode lower than the standard display mode, and when the human body enters the second region from the outside of the second region, The display state of the display unit is changed to a second low luminance mode having a luminance between the standard display mode and the first low luminance mode, and the first low luminance mode is changed when a human body enters the second region from the first region. It is characterized by maintaining.

  According to this configuration, when the display state of the display unit is set to the standard display mode and the user enters the second region from the outside of the second region, the luminance of the image on the display unit decreases. When the user enters the first area closer to the display unit than the second area, the luminance of the video on the display unit further decreases. At this time, even if the user enters the second area from the first area, the brightness of the image on the display unit does not increase.

  In the display device configured as described above, it is preferable that the image is not displayed in the first low luminance mode. According to this configuration, when the user enters the first area while the display state of the display unit is in the standard display mode, the image on the display unit is not displayed. Further, even when the user enters the second area from the first area, the non-display of the image on the display unit is maintained.

  According to the present invention, in the display device configured as described above, a human body that has entered the first region when the display state of the display unit is in the standard display mode or the second low luminance mode has a predetermined first stay time. When the human body that has entered the second area from the outside of the second area stays in the second area after a predetermined second staying time while switching to the first low-brightness mode when staying in the first area beyond It is more preferable to switch to the second low luminance mode.

  According to this configuration, when the display state of the display unit is set to, for example, the standard display mode, the brightness of the image on the display unit is lowered when the user stays in the first region beyond the first stay time. Further, when the display state of the display unit is set to the standard display mode, when the user enters the second region from the outside of the second region and stays in the second region exceeding the second stay time, the display unit The brightness of the video is reduced.

  In the display device having the above-described configuration, it is more preferable that the brightness in the second low brightness mode is lowered when the human body stays in the second region for a predetermined brightness change time longer than the second stay time. According to this configuration, when the display state of the display unit is set to the standard display mode, the luminance of the video on the display unit is further reduced when the user stays in the second region beyond the luminance change time.

  In the display device configured as described above, it is preferable that the luminance of the second low luminance mode is lowered when the frequency of shifting to the second low luminance mode is greater than a predetermined value.

  In the display device having the above configuration, it is more preferable that the display device includes an audio output unit that outputs audio, and the volume of the first low luminance mode is larger than the volume of the standard display mode. According to this configuration, when the user enters the first area, the volume of the sound output from the sound output unit increases.

  According to the present invention, the display device configured as described above further includes a transmission unit that transmits a control signal to the video playback device when the video playback device that plays back the video recorded on the medium is connected. It is preferable to stop the reproduction operation when switching to the first low luminance mode during reproduction. According to this configuration, when a user enters the first area during video playback by the video playback device, the playback operation of the video playback device stops.

  According to the present invention, when the user enters the second area from the outside of the second area, the brightness of the image on the display unit is lowered by the second low luminance mode and prompted to leave the display unit. As a result, a user who has temporarily entered the second area from the outside of the second area can discriminate the video in the second low luminance mode. In addition, when the user enters the first area from the second area, the brightness of the display unit is further reduced by the first low-brightness mode, and the user is prompted to leave the display unit again. As a result, when the user enters the first region at a short distance from the display unit, the user can be evacuated quickly in the first low-brightness mode.

  Further, when the user enters the second area from the first area, the first low luminance mode is maintained. This prevents the user from misidentifying that it is outside the second area safe for the eyes and prevents the user from staying in the second area. Therefore, adverse effects on the eyes of the user can be reduced without reducing the convenience of the display device.

It is a front view which shows the television receiver of 1st Embodiment of this invention. It is a block diagram which shows the structure of the main-body part of the television receiver of 1st Embodiment of this invention. It is a top view for demonstrating the detection area | region of the human body sensor of the television receiver of 1st Embodiment of this invention. It is a flowchart which shows the display operation of the television receiver of 1st Embodiment of this invention.

<First Embodiment>
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing the television receiver of the first embodiment. The television receiver 1 (display device) has a main unit 10 supported by an installation unit 111 installed in a rack 70 or the like, and receives a TV broadcast signal. A display unit 104 that displays an image, an audio output unit 103, and a human body sensor 109 are provided on the front surface of the main body unit 10. Further, a video playback device 60 for playing back video such as an HDD device, a DVD device, or a Blu-ray (registered trademark) device is connected to the main body unit 10.

  The audio output unit 103 includes a speaker and outputs audio. The display unit 104 is composed of, for example, a liquid crystal display panel, and displays a video based on a video signal received from a TV broadcast station and a video reproduced by the video reproduction device 60.

  The human body sensor 109 detects the distance to the human body in the living room. The human body sensor 109 includes an infrared sensor, a Fresnel lens, and an amplifier circuit (all not shown). The infrared sensor detects infrared rays emitted from the human body. The Fresnel lens collects infrared rays on the infrared sensor. The amplifier circuit amplifies the output signal of the infrared sensor.

  The output voltage of the infrared sensor varies depending on the distance between the infrared sensor and the human body. For example, when the distance between the infrared sensor and the human body is 1 m, the output voltage of the infrared sensor is about 5 V, and when the distance between the infrared sensor and the human body is 2 m, the output voltage of the infrared sensor is about 2.5 V. It becomes. Thereby, the human body sensor 109 can measure the distance between the display unit 104 and the human body.

  As the human body sensor 109, an optical sensor using an infrared light emitting diode as a light emitting element and a position detection element (PSD) as a light receiving element may be used.

  The main body 10 performs wireless communication with the remote controller 30 in accordance with infrared rays or Bluetooth (registered trademark) standards, and is remotely operated by the remote controller 30. The remote controller 30 has a cross key 30a and a character key 30b.

  The video reproduction device 60 is connected to the main body 10 by a connection cable 107a (see FIG. 2). The video reproduction device 60 records video and audio such as broadcast programs on a medium, and reproduces video and audio recorded on the medium.

  The video reproduction device 60 includes a display unit 604 and an operation unit 605. The display unit 604 is composed of, for example, a liquid crystal display panel, and displays the name of a broadcast program being recorded and the recording time. The operation unit 605 has a plurality of operation buttons 605a, and the operation of each operation button 605a can turn on the power of the video playback device 60, play back video recorded on a medium, and the like. The video playback device 60 can be remotely operated by the remote controller 30.

  FIG. 2 is a block diagram illustrating a configuration of the main body 10 of the television receiver 1. The main body unit 10 includes a control unit 101 including a CPU, and the control unit 101 controls each unit of the television receiver 1. A tuner 102, an audio output unit 103, a display unit 104, an operation unit 105, a wireless connection unit 106, a wired connection unit 107, a storage unit 108, and a human body sensor 109 are connected to the control unit 101.

  The operation unit 105 has a plurality of operation buttons (not shown) arranged on the upper surface and side surfaces of the main body unit 10. By operating each operation button, the power to the main body unit 10 is changed, the channel is changed, and the audio output unit 103 The output volume can be adjusted.

  An antenna 102a is connected to the tuner 102, and the tuner 102 receives a TV broadcast signal from a TV broadcast station via the antenna 102a and demodulates it.

  The wireless connection unit 106 is provided with an antenna 106a. The wireless connection unit 106 transmits and receives communication data to and from the remote controller 30 by wireless communication according to the Bluetooth standard via the antenna 106a.

  A video reproduction device 60 and the like are connected to the wired connection unit 107 via a connection cable 107a. The connection cable 107a complies with the HDMI (High-Definition Multimedia Interface) (registered trademark) standard. The connection cable 107a is provided with a CEC (Consumer Electronics Control) control line (not shown). A command for operating a function set in the main body unit 10 and the video reproduction device 60 is transmitted and received between the main body unit 10 and the video reproduction device 60 via a CEC control line. Thereby, functions can be controlled between the main body 10 and the video reproduction device 60. For example, the main body unit 10 can transmit a control signal to the video reproduction device 60 by the wired connection unit 107.

  The storage unit 108 includes, for example, an EEPROM or the like, and stores an operation program and various data of the main body unit 10.

  FIG. 3 is a plan view for explaining the detection region of the human body sensor 109. A first area A1 and a second area A2 that are detection areas of the human body sensor 109 are set in front of the main body 10 of the television receiver 1. The first area A1 and the second area A2 are areas in which the user's eyes may be adversely affected if the user stays and continues to watch the image on the display unit 104.

  The first area A1 is within a predetermined distance with respect to the front surface of the display unit 104. Although the size of the first area A1 is not particularly limited, in the present embodiment, the planar shape of the first area A1 is a semicircular shape having a radius of 0.5 m with the human body sensor 109 as the center.

  The second area A2 is set outside the first area A1, and is a predetermined range away from the front surface of the display unit 104 than the first area A1. Although the size of the second area A2 is not particularly limited, in the present embodiment, the planar shape of the second area A2 is a semicircular shape having a radius of 1 m with the human body sensor 109 as the center. The setting range of the first area A1 and the second area A2 can be changed by a predetermined operation of the remote controller 30 or the operation unit 105.

  FIG. 4 is a flowchart showing the display operation of the television receiver 1. Note that the display operation of the television receiver 1 is the same when the video of the broadcast program is displayed on the display unit 104 and when the video is displayed on the display unit 104 during the playback operation of the video playback device 60. Therefore, here, a case where a video of a broadcast program is displayed on the display unit 104 will be described as an example.

  When the main unit 10 of the television receiver 1 is turned on by a predetermined operation of the remote controller 30 or the operation unit 105, a video of the broadcast program is displayed on the display unit 104. The audio of the broadcast program is output from the audio output unit 103.

  In step # 1, the flag F is initialized by substituting 0 for a flag F indicating that the human body H has stayed in the first area A1. In step # 2, the human body H is detected by the human body sensor 109.

  In Step # 3, it is determined whether or not the human body H exists outside the second area A2. When the human body H exists outside the second area A2, the process proceeds to step # 4. When the human body H does not exist outside the second area A2, the process proceeds to step # 6.

  In step # 4, 0 is assigned to the flag F to which 1 is assigned in step # 14 to be described later. In step # 5, an image is displayed with the display state of the display unit 104 set to a standard display mode with a predetermined luminance. At this time, sound is output from the sound output unit 103 at a predetermined volume. The brightness and volume in the standard display mode are set to brightness and volume suitable for the user to view the broadcast program. Note that the luminance and volume in the standard display mode are set to 100%. After step # 5, the process returns to step # 2, and the detection of the human body H by the human body sensor 109 is continued.

  In step # 6, it is determined whether or not the human body H exists in the second area A2. When the human body H does not exist in the second area A2, the process proceeds to step # 13. At this time, the human body H exists in the first area A1. If the human body H exists in the second area A2, the process proceeds to step # 7.

  In step # 13, it is determined whether or not the stay time t1 of the human body H that has entered the first area A1 is equal to or longer than a predetermined first stay time T1 (for example, 30 seconds). If the stay time t1 is less than the first stay time T1, the process returns to step # 2. If the stay time t1 is equal to or longer than the first stay time T1, the process proceeds to step # 14.

  In step # 14, 1 is assigned to the flag F. That is, as for the flag F, 1 is substituted when the display state of the display unit 104 is the first low luminance mode, and 0 is substituted when the display state of the display unit 104 is the standard display mode.

  In step # 15, a message such as “Turn off the TV. Look away.” Is displayed on the display unit 104. This message notifies that the video displayed on the display unit 104 is not displayed.

  In step # 16, the display state of the display unit 104 is changed to the first low luminance mode having a lower luminance than the standard display mode. In the present embodiment, the luminance of the display unit 104 is set to 0% and the video is not displayed. This prompts the user to leave the display unit 104. At this time, the sound output from the sound output unit 103 is made larger than that in the standard display mode. Assuming that the volume in the standard display mode is 100%, the volume in the first low luminance mode is, for example, 200%. As a result, the user is more strongly prompted to leave the display unit 104. After step # 16, the process returns to step # 2.

  In step # 7, it is determined whether or not the flag F is 1. When the flag F is 1, it indicates that the human body H has entered the second area A2 from the first area A1, and the process returns to step # 2 to maintain the first low luminance mode. When the flag F is 0, it indicates that the human body H has entered the second area A2 from the outside of the second area A2, and the process proceeds to step # 8.

  In step # 8, it is determined whether or not the stay time t2 of the human body H that has entered the second area A2 is equal to or longer than a predetermined second stay time T2 (for example, 30 seconds). If the stay time t2 is shorter than the second stay time T2, the process returns to step # 2. If the stay time t2 is equal to or longer than the second stay time T2, the process proceeds to step # 9. In the present embodiment, the second stay time T2 is set to be the same as the first stay time T1, but may be set to be different from the first stay time T1.

  In step # 9, it is determined whether or not the number n of transitions to a second low-luminance mode, which will be described later, has exceeded the number Nc of brightness changes within a predetermined period Tr. That is, it is determined whether or not the frequency (n / Tr) for shifting to the second low luminance mode is greater than a predetermined value (Nc / Tr). When the number n of transitions exceeds the number Nc of brightness changes (for example, 10 times) within a predetermined period Tr (for example, 4 hours), the process proceeds to step # 12. If the number of transitions n does not exceed the number of brightness changes Nc within the predetermined period Tr, the process proceeds to step # 10.

  In step # 10, it is determined whether or not the stay time t2 exceeds a predetermined brightness change time Tc. The brightness change time Tc is longer than the second stay time T2, and is set to 2 minutes, for example. If the stay time t2 exceeds the luminance change time Tc, the process proceeds to step # 12. If the stay time t2 does not exceed the brightness change time Tc, the process proceeds to step # 11.

  In step # 11, the display state of the display unit 104 is changed to the second low luminance mode having a luminance between the standard display mode and the first low luminance mode. In the second low luminance mode, an image is displayed on the display unit 104 at 50% of the luminance in the standard display mode. As a result, the brightness of the image on the display unit 104 is lower than that in the standard display mode, and the user is prompted to leave the display unit 104. At this time, the volume of the sound output from the sound output unit 103 is twice that in the standard display mode. As a result, the user is more strongly prompted to leave the display unit 104.

  If the flag F is 1 in step # 7, the user enters the second area A2 from the first area A1 and the first low luminance mode is maintained, so the video on the display unit 104 remains undisplayed. It has become. That is, even if the user moves back from the first area A1 to the second area A2, the second low luminance mode is not shifted, and the luminance of the image on the display unit 104 does not increase. This prevents the user from misidentifying that it is outside the second area A2 that is safe for the eyes. Therefore, it is possible to prevent the user from staying in the second area A2 and to reduce the adverse effects on the user's eyes.

  In step # 12, the brightness in the second low brightness mode is lowered. For example, the luminance is set to 25% of the luminance in the standard display mode. Thereby, when the stay time t2 when the user stayed in the second area A2 and the frequency (n / Tr) are large, the user can be further urged to leave the display unit 104.

  After step # 11 and step # 12, the process returns to step # 2, and steps # 2 to # 16 are repeated.

  According to the present embodiment, when the user enters the second area A2 from the outside of the second area A2, the brightness of the image on the display unit 104 is reduced by the second low luminance mode, and the user is prompted to leave the display unit 104. Accordingly, a user who has temporarily entered the second area A2 from the outside of the second area A2 can discriminate the image by the second low luminance mode. When the user enters the first area A1 from the second area A2, the luminance of the image on the display unit 104 is further lowered by the first low luminance mode, and is prompted to leave the display unit 104 again. Accordingly, when the user enters the first area A1 at a short distance from the display unit 104, the user can be evacuated quickly in the first low luminance mode.

  Further, when the user enters the second area A2 from the first area A1, the first low luminance mode is maintained. This prevents the user from misidentifying that the user is outside the second area A2 that is safe for the eyes, and prevents the user from staying in the second area A2. Therefore, it is possible to reduce adverse effects on the eyes of the user without reducing the convenience of the television receiver 1.

  In addition, when the display state of the display unit 104 is in the standard display mode or the second low-luminance mode, the human body H that has entered the first area A1 stays in the first area A1 beyond the first stay time T1. When the human body H that has entered the second area A2 from the outside of the second area A2 stays in the second area A2 beyond the second stay time T2, the second low intensity mode is set. Switch. As a result, when the user has only temporarily passed through the first area A1 and the second area A2, the luminance of the video on the display unit 104 does not decrease. Therefore, the convenience of the television receiver 1 can be further improved.

  Further, when the human body H stays in the second region A2 beyond the luminance change time Tc longer than the second stay time T2, the luminance in the second low luminance mode is lowered. As a result, the user is more strongly prompted to leave the display unit 104. Therefore, the adverse effect on the user's eyes can be further reduced.

  Further, when the frequency of shifting to the second low luminance mode is greater than a predetermined value, the luminance of the second low luminance mode is lowered. As a result, the user is more strongly prompted to leave the display unit 104. Therefore, the adverse effect on the user's eyes can be further reduced.

  In addition, since the audio output unit 103 that outputs audio is provided and the volume in the first low luminance mode is larger than the volume in the standard display mode, the user is further strongly encouraged to move away from the display unit 104. Therefore, the adverse effect on the user's eyes can be further reduced.

  In the present embodiment, the main body 10 of the television receiver 1 includes a wired connection unit 107 (transmission unit) that transmits a control signal to the video reproduction device 60 when the video reproduction device 60 is connected. Therefore, the playback operation by the video playback device 60 may be stopped when the video playback device 60 switches to the first low luminance mode during playback of the video. Thereby, even when the video reproduced by the video reproduction device 60 is displayed on the display unit 104, the adverse effect on the eyes of the user can be reduced as in the case where the video of the broadcast program is displayed.

  In this embodiment, the image is not displayed in the first low luminance mode. However, if the luminance in the first low luminance mode is lower than the luminance in the second low luminance mode, the first low luminance mode. An image may be displayed on the display unit 104. Thereby, since viewing of the broadcast program is not interrupted, it is possible to prevent the broadcast program from being overlooked. Therefore, the usability of the television receiver 1 can be improved.

Second Embodiment
Next, a second embodiment of the present invention will be described. This embodiment is different from the first embodiment in that a recording operation is performed by the video reproduction device 60 in the first low luminance mode when the user is watching a broadcast program. Other parts are the same as those in the first embodiment.

  In step # 16 of FIG. 4, the video playback device 60 records a broadcast program. As a result, even when the broadcast program is viewed, the user can view the broadcast program during the non-display even when the mode is shifted to the first low luminance mode and the video on the display unit 104 is not displayed. Therefore, it is possible to reliably prevent the broadcast program from being overlooked.

  According to the second embodiment, the same effect as that of the first embodiment can be obtained. The broadcast program is recorded by the video playback device 60 when the user shifts to the first low-brightness mode while viewing the broadcast program. Thereby, even when the mode is shifted to the first low luminance mode, it is possible to reliably prevent the broadcast program from being overlooked.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. This embodiment is different from the first embodiment in that the brightness of the image is reduced compared to the standard display mode in the second low brightness mode, and the contrast ratio of the image is reduced. Other parts are the same as those in the first embodiment.

  In step # 11 and step # 12 of FIG. 4, the contrast ratio of the video displayed on the display unit 104 is lowered as compared with that in the standard display mode. As a result, the image displayed on the display unit 104 in the second low luminance mode is less clear than the image in the standard display mode. Accordingly, the user is more strongly prompted to leave the display unit 104.

  According to the third embodiment, the same effect as that of the first embodiment can be obtained. Further, the contrast ratio of the image displayed on the display unit 104 in the second low luminance mode is made lower than the contrast ratio of the image displayed on the display unit 104 in the standard display mode. As a result, the image displayed on the display unit 104 in the second low luminance mode is less clear than the image displayed on the display unit 104 in the standard display mode. Accordingly, the user is more strongly prompted to leave the display unit 104. As a result, adverse effects on the user's eyes can be further reduced.

  In the first to third embodiments, the television receiver 1 is described as an example of the display device. However, a display or the like that can display a video during playback of the video by the video playback device 60 may be used.

  The present invention can be used for a display device provided with a human body sensor.

1 Television receiver (display device)
DESCRIPTION OF SYMBOLS 10 Main body part 30 Remote controller 60 Image | video reproduction apparatus 101 Control part 102 Tuner 103 Audio | voice output part 104 Display part 105 Operation part 106 Wireless connection part 107 Wired connection part 108 Storage part 109 Human body sensor A1 1st area | region A2 2nd area | region

Claims (7)

In a display device comprising: a display unit that displays an image; and a human body sensor that is attached to a front surface of the display unit and detects a distance to a human body in a living room.
When the human body is not detected in the first region within a predetermined distance from the human body sensor and in the second region outside the first region, the display state of the display unit is set to a standard display mode with a predetermined luminance.
When a human body is detected in the first region, the display state of the display unit is set to a first low-luminance mode having a lower luminance than the standard display mode, and
When a human body enters the second region from the outside of the second region, the display state of the display unit is changed to a second low luminance mode between the standard display mode and the first low luminance mode,
A display device characterized in that the first low luminance mode is maintained when a human body enters the second region from the first region.   The display device according to claim 1, wherein an image is not displayed in the first low luminance mode. When the display state of the display unit is in the standard display mode or the second low luminance mode, the first time when the human body that has entered the first region stays in the first region for a predetermined first stay time. While switching to low brightness mode,
The human body that has entered the second region from the outside of the second region switches to the second low-luminance mode when the human body stays in the second region exceeding a predetermined second staying time. The display device described in 1.   4. The display device according to claim 3, wherein the luminance in the second low luminance mode is lowered when the human body stays in the second region beyond a predetermined luminance change time longer than the second stay time.   The display device according to claim 1, wherein when the frequency of transition to the second low luminance mode is greater than a predetermined value, the luminance of the second low luminance mode is lowered. It has an audio output unit that outputs audio,
The display device according to claim 1, wherein a volume of the first low luminance mode is larger than a volume of the standard display mode. A transmission unit that transmits a control signal to the video playback device when the video playback device that plays back the video recorded on the medium is connected;
The display device according to any one of claims 1 to 6, wherein the playback operation is stopped when the first low-brightness mode is switched during the playback of the video by the video playback device.

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