JP2013117389A - Display device and human body detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a display device for detecting a human body by using an infrared ray sensor having a gap in the whole detection area to detect a human body even when a viewer exists at a distance where he/she stays completely in the gap.SOLUTION: The display device has an infrared ray sensor having a reception range with clearances, a drive unit for performing rotation driving of the infrared ray sensor and a human existence determination unit for determining the existence of a human body from an output of the infrared ray sensor. The human existence determination unit controls the drive unit to perform rotation driving of the infrared ray sensor by a prescribed rotation amount each time a continuous period starting from the start of the determination in which it is determined no human body exists exceeds a first period so as to repeatedly determine the existence/nonexistence of a human body. When the continuous period starting from the start of the determination exceeds a second period, the human existence determination unit determines no human body exists in front of the display device.

Description

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

  Conventionally, there are lighting fixtures with a human body detection sensor using pyroelectric elements that detect heat rays, etc., and the presence or absence of a person is determined by the difference in detection results such as the human body crossing the detection area, Some are lit when present and others are extinguished when not present. In addition, there is a configuration in which the entire detection region is divided by providing a gap that blocks heat transfer over the entire light receiving range of one pyroelectric element. In such a pyroelectric element having a plurality of discrete detection areas, if the heating element operates in any of the detection areas corresponding to the respective detection areas, there is a difference in the detection result of the pyroelectric element. For this reason, it is a common practice to reduce the detection area for each detection area to be divided so that the detection results differ even with relatively small movements. Here, the detection area is an area in the light receiving range, and the detection area is an area sensed by the sensor at a position away from the sensor.

  When a human body detection sensor using such a pyroelectric element is provided in a display device such as a TV and the display device is controlled by the presence of a person, depending on the size of the detection area and the width of the gap, the human body detection sensor There is a problem that it is impossible to detect a small movement of a viewer who is away from the viewer and it is determined that there is no person. Moreover, since the case where it is viewing from the position which is not the front of a display apparatus is also considered, it is necessary to ensure the range of the whole detection area widely.

  As a method for solving such a problem, a pyroelectric element in which the size of the entire detection area and the interval between the detection areas are reduced so as to detect a small movement of a person such as moving a hand or head, and walking of a person, etc. A method for widening the range of the entire detection area while having an area for detecting a small movement by including a pyroelectric element having a large detection area and a large interval between the detection areas so as to detect large movements was there. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 10-3817 (page 2-4, FIG. 1)

  As disclosed in Patent Document 1, when the human body detection sensor in Patent Document 1 is provided in a toilet, a detection area that detects a small movement of a person such as moving a hand or head is set near the toilet, It is possible to adjust so that a large detection area can be used as a doorway of a toilet so as to detect a large movement such as walking. However, in the case where it is considered to be provided in a display device such as a TV, if the distance between the display device and the viewer is increased, the size and interval of the detection area assumed between the viewers located far away from each other may be between adjacent detection areas. It is conceivable that it will fall within the range and cannot be detected. Further, since it is impossible to detect a small movement of a viewer who is watching from a position other than the front of the display device, there is a situation in which it is difficult to detect a human body even if a human body detection sensor as in Patent Document 1 is provided in the display device. There was a problem that occurred.

  The present invention has been made to solve the above-described problems. If the distance that the sensor can detect without sacrificing the area of the entire detection area, the viewer can move between adjacent detection areas. A display device including a human body detection sensor that can detect without continuing to settle is obtained.

  A display device according to the present invention includes a display unit that displays an image, an infrared sensor having a light receiving range with a gap, a drive unit that rotationally drives the infrared sensor, and the presence or absence of a human body from the output of the infrared sensor. The determination unit is configured to cause the drive unit to rotationally drive the infrared sensor by a predetermined amount of rotation every time the continuation period in which it is determined that there is no human body from the start of the determination exceeds the first period. The control is repeatedly performed to determine the presence or absence of a human body. When the duration exceeds the second period from the start of the determination, a determination result indicating that no human body exists in the viewing area is output. And a person determination unit.

  The present invention includes a drive unit that rotationally drives the infrared sensor, and the drive unit includes the drive unit whenever the continuation period in which it is determined that there is no human body from the start of the determination regarding the presence or absence of the human body exceeds the first period. Even if the viewer is not moving significantly, the infrared sensor is controlled to rotate the infrared sensor for a predetermined amount of rotation, and the presence or absence of the human body is determined. Therefore, it is possible to determine whether or not there is a viewer (human body) in the entire target detection area.

It is a block diagram of the display apparatus which shows Embodiment 1 of this invention. It is a top view which shows the relationship between the display apparatus and viewer in Embodiment 1 of this invention. It is a figure which shows the relationship between the shape of the light-receiving range of the infrared sensor and viewer in Embodiment 1 of this invention. It is a figure which shows the relationship between the shape of the light-receiving range of the infrared sensor in Embodiment 1 of this invention, and rotation amount. It is a flowchart which shows the example of the process sequence of the display apparatus by Embodiment 1 of this invention. It is a figure which shows the time relationship of the process of the display apparatus by Embodiment 1 of this invention. It is a figure which shows the relationship between the shape of the light-receiving range of the infrared sensor in Embodiment 2 of this invention, and a viewer. It is a figure which shows the relationship between the shape of the light-receiving range of the infrared sensor in Embodiment 2 of this invention, and rotation amount. It is a figure which shows the relationship between the shape of the light-receiving range of the infrared sensor and viewer in Embodiment 3 of this invention.

Embodiment 1 FIG.
FIG. 1 shows a display device 100 according to Embodiment 1 for carrying out the present invention. In FIG. 1, a display device 100 displays an image on a display screen, an infrared sensor 101 on a casing 110, a presence determination unit 102 (not shown) that determines the presence or absence of a human body from the output of the infrared sensor 101. The display unit 104 is provided, and the driving unit 103 rotates the casing 110 with the rotation axis as A. Here, the rotation axis A is a direction substantially perpendicular to the ground plane of the display device (Z-axis direction).

  FIG. 2 is a top view showing the relationship between the display device and the viewer in Embodiment 1 of the present invention. In FIG. 2, a human body C that is a viewer is present at a distance L from the display screen of the display device, and the display device 100 is driven to rotate the housing 110 in the counterclockwise direction as viewed from above with the rotation axis A. It shows how to make it.

  The drive unit 103 includes a control unit that controls the rotation direction to generate a voltage, a motor that is driven by the voltage, and a mechanism unit that drives the housing 110 by the rotation of the motor. In FIG. 2, the drive unit 103 is illustrated as the infrared sensor 101 and the display unit 104 that rotate the housing 110 together. However, the infrared sensor 101 and the display unit 104 may be configured to be rotated by the driving unit 103 with different rotation amounts.

  Next, each component will be described in detail. The infrared sensor 101 includes a pyroelectric element and a lens. The pyroelectric element converts an amount of change in temperature information of a detection region that receives light into an electric signal. Based on the electrical signal of the pyroelectric element, it can be detected whether or not the temperature information has changed in the detection region, that is, whether or not the heating element has moved. For example, when the heating element enters the detection area from outside the detection area, and when the heating element goes out of the detection area from the detection area, the range that the heating element occupies within the detection area changes. Thus, a change appears in the electrical signal indicating the amount of change in the temperature information in the detection region. In the present invention, this heating element will be described as a human body.

  In general, the entire detection region is divided by providing a gap that blocks heat transfer by blocking, refracting, or reflecting infrared rays over the entire light receiving range of one pyroelectric element. In this way, by dividing the entire detection region by one pyroelectric element, if the heating element operates in any of the detection areas corresponding to each detection region, a change appears in the electrical signal of the pyroelectric element. At this time, an infrared sensor corresponding to a small movement can be configured by changing the size of each detection area. However, there is a physical limit to reducing the width of the gap. In addition, even if the size of each detection region is too small or the width of the gap is too small, it is difficult to understand the change in the electrical signal, so a certain interval is required.

  Further, the entire detection area may be expanded by using a plurality of pyroelectric elements and having a separate detection area. However, when it has the structure which divides the whole detection area | region with a pyroelectric element, it will have each gap | interval.

  FIG. 3 is a diagram showing the relationship between the shape of the light receiving range of the infrared sensor 101 and the viewer. In FIG. 3, D1 to D16 indicate each detection area, and the entire detection area is divided into 16 detection areas (D1 to D16) by providing a gap for blocking heat transfer to the entire light receiving range of the infrared sensor. It shows a state of division. FIG. 3A shows a state in which the human body C exists near the center of the entire detection area. If the distance L between the human body C and the display screen is long, the human body will be accommodated in the center gap as shown in FIG. 3A, and the infrared sensor 101 will be able to move the human body C even if there is a small movement. Existence may not be detected. In FIG. 3B, since the human body C is in the detection areas D4 and D5, it is possible to detect the movement of the human body if the movement of the human body C changes in the range that occupies the detection area. .

  In this way, the infrared sensor 101 detects a human body based on a change in the electrical signal of the pyroelectric element, and the detection result of the infrared sensor 101 is supplied to the occupant determination unit 102 as a human body detection signal.

  Further, FIG. 3 shows that the human body C that cannot be detected in FIG. 3A can be obtained by moving the infrared sensor 101 in the X direction as shown in FIG. FIG. 3B shows the positional relationship between the detection area of the infrared sensor 101 and the human body C, which indicates that the human body C can be detected.

  Accordingly, a human body smaller than the width of the gap of the infrared sensor 101 can be detected by rotating the infrared sensor 101 to shift the target detection area. At this time, if the rotation of the infrared sensor 101 at the start of the first detection is rotationally driven so that the position of the gap is completely filled in the detection area after the rotation, a small movement of the human body smaller than the width of the gap cannot be detected. The human body C can be detected at least once by setting the amount of rotation to rotate at one degree so that the gap of the infrared sensor 101 is multiplied several times to fill the detection area after rotational driving.

  However, as the amount of rotation is reduced, the number of rotations required until it is determined that there is no human body increases, and as a result, the time required to determine that there is no human body increases.

  Therefore, the number of rotations required until it is determined that no human body exists can be set first, and the amount of rotation can be set based on this.

  For example, the case where the entire detection area of the infrared sensor 101 as shown in FIG. 4 is divided into detection areas (D1 to D16) of 4 rows and 4 columns will be described. Here, E1, E2, and E3 are center lines obtained by dividing the gap in the column direction of each detection region into two equal parts.

  In this case, the left boundary of the detection area (D1, D3, D5, and D7) in the second row of the infrared sensor 101 is set when the number of rotations required until it is determined that no human body is present is set to one. Similarly, until the boundary line on the left side of the detection area (D10, D12, D14, and D16) in the third row reaches E2, the detection area (D9, D11, D13) in the fourth row until the line reaches E1. , And D15) until the left boundary line reaches E3, the infrared sensor 101 is driven to rotate leftward by the rotation amount θ. That is, when the number of times of rotational driving is set to 1, the rotational driving is performed to a position where the gap in the column direction of the detection region is equally divided.

  With this setting, if the human body is larger than one half of the width of the gap of the light receiving range D of the infrared sensor 101, the movement can be detected.

  From these, when the amount of rotational drive of the infrared sensor 101 is set so that the line that divides the gap of the light receiving range D of the infrared sensor 101 into N equal parts (N is an integer of 2 or more) and the boundary line of the light receiving range overlap. If the human body is larger than 1 / N of the gap width of the light receiving range 101, the movement can be detected, and the number of rotations required until it is determined that there is no human body is N-1 times. I understand that

  Next, the occupant determination unit 102 will be described. The occupant determination unit 102 determines the presence or absence of a human body using the human body detection signal output from the infrared sensor 101, and performs control to cause the drive unit 103 to perform rotational driving for a predetermined amount of rotation. It is. FIG. 5 is a flowchart for explaining processing in which the presence determination unit 102 erases the display screen 104 using the human body detection signal output from the infrared sensor 101.

  First, the occupant determination unit 102 determines whether or not the drive unit 103 is being driven (S1). This determination is made based on the drive notification signal when the drive notification signal indicating that the rotation drive is being performed is output from the drive unit 103 while the drive unit 103 is performing the rotation drive.

  If the drive notification signal indicates that rotation drive is being performed, it is determined in step S1 that the drive unit 103 is being driven (S1: Y), and the display device 100 does not perform human body detection processing. The process ends. This prevents the infrared sensor 101 from rotating due to the rotation of the infrared sensor 101 by the drive unit 103 and prevents the infrared sensor 101 from erroneously detecting the movement of the human body even when the human body does not exist. Can do.

  If the drive notification signal indicates that rotation drive is not being performed, it is determined in step S1 that the drive unit 103 is not being driven (S1: N), and the process proceeds to step S2.

  In step S2, it is determined whether or not the infrared sensor has detected the movement of the human body. This determination is made based on the human body detection signal output from the infrared sensor 101. When the human body is detected (S2: Y), the process proceeds to step S3, the unattended count value indicating the duration of the state in which the human body is not detected is reset to 0, and the process ends.

  If no human body is detected in step S2 (S2: N), the process proceeds to step S4, 1 is added to the unattended count, and the process proceeds to step S5.

  In step S5, when the unattended count value is not the same value as the first value (S5: N), the process proceeds to step S7, and when the unattended count value becomes the same value as the first value (S5: Y), Proceeding to step S6, in step S6, the display unit 104 is controlled to display the content prompting the viewer to perform the operation, and the process is terminated. The first value is a parameter that determines the time from when the human body is no longer detected until the display screen 104 displays information requesting the viewer to move.

  This is because the infrared sensor 101 detects the movement of the human body, and even if a human body exists in front of the display device 100, the human body is not detected by the infrared sensor 101 if the movement is extremely small. Therefore, by urging the user to operate, it is possible to prevent the infrared sensor 101 from detecting the human body.

  In step S7, if the unmanned count value is not the same value as the second value (S7: N), the process proceeds to step S9. If the unmanned count value becomes the same value as the second value (S7: Y), Proceeding to step S8, in step S8, the drive unit 103 performs control to rotate the infrared sensor 101 by a predetermined rotation amount, and then the process ends. The second value is a parameter that determines the time from when the human body is no longer detected until the drive unit 103 is instructed to drive the infrared sensor 101.

  In this way, by rotating the infrared sensor 101 by the drive unit 103, the boundary of the light receiving range does not overlap the human body regardless of the fact that the human body exists, so that it is not detected even if the operation is performed. Can be prevented.

  In step S9, if the unattended count value is not the same value as the third value (S9: N), the process is terminated without doing anything, and the unattended count value becomes the same value as the third value (S9). : Y) proceeds to step S10, and in step S10, the display unit 104 is controlled to turn off the backlight of the display screen, and then the process ends. The third value is a parameter that determines the time from when the human body is no longer detected until the display screen 104 is erased.

  Note that this processing is started at regular intervals while the display screen 104 is displayed, and the unattended count value is retained even after the processing is completed, and is taken over at the start of the next execution. To do.

  The first value, the second value, and the third value may be preset values or values that can be input by the user. Further, only a part of the values may be input by the user. For example, the user inputs the third value, and the first value and the second value are set to constants for the third value, respectively. It is good also as a value multiplied.

  However, as a process when the process of step S10 finally determines that the human body of the display device 100 does not exist, the third value is preferably larger than the first value and the second value. .

  For example, assuming that this process is performed once a second, if the state where no human body is detected continues for 10 minutes and the display screen 104 is to be erased, the state where no human body is detected continues for 10 minutes. Since the unattended count is 600, the third value is 600. At this time, if the second value is set to 300, which is an intermediate value of 600, when the rotation driving performed until it is determined that there is no person, the value of the person in each state before and after the rotation driving is 300. The time for detecting the motion can be made equal. Alternatively, by setting the value close to the third value such as 500, it is possible to prevent the rotational drive from being executed as much as possible. In addition, by displaying the content that prompts the viewer to perform the operation immediately before the rotation drive or the erase operation, the viewer does not move even though the boundary of the light receiving range overlaps the human body. It is also possible to prevent viewing and viewing from being hindered by driving or erasing. At this time, for example, the first value is 590 or the like, which is 10 seconds less than the second value or the third value.

  In FIG. 5, the process subsequent to step S4 is performed in the order of step S5, step S7, and step S9. However, as the process subsequent to step S4, any of step S5, step S7, and step S9 is performed. If any one of steps S6, S8, and S10 is performed at the same time as performing parallel processing in any one of them, the execution processing at that time may be terminated after all of those processes are completed.

  FIG. 6 is a diagram illustrating the movement of the occupant determination unit 102 when the first value is set to 1 or 3, the second value is set to 2, and the third value is set to 4.

  In FIG. 6A, the process of step S6 is executed when the unattended count value is 1, the process of step S8 is executed when the unattended count value is 2, and the infrared ray is transmitted at step S2 at the next subsequent execution. The case where a human body is detected from the output from the sensor 101 is shown.

  In FIG. 6B, the process of step S6 is executed when the unmanned count value is 1 or 3, the process of step S8 is executed when the unattended count value is 2, and displayed by step S10 when the unattended count value is 4. A case is shown in which processing is terminated after the control of the display 104 to turn off the backlight of the display screen is performed.

  In this way, the first value or the second value has a plurality of values, and when one of the values is the same as the unattended count value, the processing is performed a plurality of times while reaching the third value. A process for prompting the person to move and a process for rotating the infrared sensor 101 can be performed.

  The drive unit 103 may include a device that can acquire the direction in which the display screen 104 is facing, such as a rotary encoder.

  The process of resetting the unattended count value to 0 is not only performed by the process of step S3 but also when it is estimated that a person exists in front of the display apparatus 100, such as when the user operates the display apparatus 100. You may do it.

  The drive unit 103 performs rotation drive according to an instruction from the occupant determination unit 102. However, the drive unit 103 is not limited to this, and may be configured to perform rotation drive by an operation of a user of the display device 100, for example.

  By performing the above processing, the infrared sensor 101 cannot detect the movement even though the human body is actually present in front of the display device 100. The display screen 104 can be erased when the human body does not actually exist for a long time while preventing the display screen 104 from being judged and erased.

  Further, the invention according to the present embodiment has been described as the display device 100 provided with the display unit 104 included in the housing 110. However, the display unit 104 is provided separately from the housing 110, and the infrared sensor 101 is provided in the housing 110. It goes without saying that the intended object can be achieved by the human body detection device even in combination with a human body detection device (not shown) provided with the presence determination unit 102 and the drive unit 103.

Embodiment 2. FIG.
In the first embodiment, the rotation axis A of the infrared sensor 101 is rotationally driven integrally with the display unit 104 as a direction substantially perpendicular to the ground plane of the display device 100 (Z-axis direction). In the second aspect, a drive unit that can further rotate in a direction (X-axis direction) substantially horizontal with respect to the ground plane of the display device 100 is provided as a rotation axis of the infrared sensor.

  FIG. 7 is a diagram showing the relationship between the shape of the light receiving range of the infrared sensor 201 provided in the display device according to the second embodiment and the viewer. Here, A1 is a rotation axis in the Z-axis direction, and A2 is a rotation axis in the X-axis direction.

In FIG. 7A, it is assumed that the human body that is the viewer is viewing with the display device lying down. At this time, if the infrared sensor 201 is within the gap in the X-axis direction of the infrared sensor 201, the infrared sensor 201 is rotated in the X-axis direction as shown in FIG. It remains in the space between the two, and it is difficult to detect the human body. In this case, if it can also be driven to rotate in the direction of the rotation axis A2, the human body enters the detection area D3 as shown in FIG. Therefore, it is possible to detect that the human body exists in the display area of the display device 100 by detecting the movement of the human body.
Embodiment 3 FIG.
In each of the above embodiments, the entire detection area of the infrared sensor is provided in 4 rows in the X-axis direction and 4 columns in the Z-axis direction. However, the infrared sensor itself is provided to be inclined with respect to the ground plane. However, it goes without saying that the intended purpose can be achieved.

  FIG. 9 is a diagram illustrating the relationship between the shape of the light receiving range of the infrared sensor 301 provided in the display device according to the third embodiment and the viewer. Here, the fact that the infrared sensor 301 is installed obliquely with respect to the rotation axis A of the drive unit 103 means that the infrared sensor 301 has a light receiving range with respect to all planes perpendicular to the rotation axis A of the drive unit 103. It is installed in the housing 110 so that there is at least one line that intersects the boundary surface of D1 to D16.

  Further, in FIG. 9, the boundary line of the light receiving range D of the infrared sensor 301 is not provided to be inclined at exactly 45 degrees with respect to the ground plane of the display device 100, but the rotation axis A is the entire detection area of the infrared sensor 301. It is provided so as to remove the apex when it is done. This is because, since the shape of a sitting human body is generally long in the vertical direction, the human body and the light receiving range are more than in the case where the boundary line of the light receiving range D is inclined at 45 degrees with respect to the ground plane. There is an effect that the possibility that the boundary line of D overlaps becomes higher.

DESCRIPTION OF SYMBOLS 100 Display apparatus 101 Infrared sensor 102 Resident determination part 103 Drive part 104 Display screen 110 Case

Claims (9)

A display unit for displaying images;
An infrared sensor having a light receiving range with a gap;
A drive unit that rotationally drives the infrared sensor;
The presence or absence of a human body is determined from the output of the infrared sensor, and each time the duration determined that there is no human body from the start of the determination exceeds a first period, the infrared ray is sent to the drive unit. When the sensor is controlled to rotate the sensor by a predetermined amount of rotation, the presence / absence of a human body is repeatedly determined, and when the duration exceeds the second period from the start of the determination, And a occupant determination unit that outputs a determination result indicating that there is no presence. The predetermined rotation amount is a rotation amount based on a width obtained by equally dividing the width of the gap in the rotation direction by a predetermined number of divisions,
The second period is a period obtained by multiplying the first period by the number of times of the predetermined number of divisions, and a period required for rotational driving of the predetermined amount of rotation by the number of times obtained by subtracting 1 from the predetermined number of divisions. The display device according to claim 1, wherein the display period is a period obtained by adding the remaining period. 3. The display according to claim 1, wherein the driving unit rotationally drives the rotation axis of the infrared sensor with two axes of a substantially horizontal direction and a substantially vertical direction of the infrared sensor. apparatus. The presence determination unit stops the determination during a period in which the driving unit rotates the infrared sensor, and restarts the determination when the driving unit stops rotating the infrared sensor. The display device according to any one of claims 1 to 3, wherein the display device is characterized. The infrared sensor has the gap so that the detection areas are two-dimensionally arranged, and the gap is provided to be inclined at a predetermined angle with respect to the ground. The display device according to claim 4. The infrared sensor is provided with a light receiving surface in the same direction as the display surface of the display unit,
The display device according to claim 1, wherein the driving unit rotationally drives the infrared sensor and the display unit with the same rotation amount. The resident determination unit makes the display unit disappear when the continuation period exceeds a third period longer than the second period from the start of the determination. The display device according to claim 6. The presence determination unit displays a predetermined image on the display unit when the continuation period exceeds a fourth period that is longer than the second period from the start of the determination. The display device according to claim 1. An infrared sensor having a light receiving range with a gap;
A drive unit that rotationally drives the infrared sensor;
The presence or absence of a human body is determined from the output of the infrared sensor, and each time the duration determined that there is no human body from the start of the determination exceeds a first period, the infrared ray is sent to the drive unit. When the sensor is controlled to rotate the sensor by a predetermined amount of rotation, the presence / absence of a human body is repeatedly determined. When the duration exceeds the second period from the start of the determination, the human body is detected in the detection area. A human body detection device comprising: a human presence determination unit that outputs a determination result indicating that there is no presence.

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