JP2001324944A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the sensitivity of a human sensor for detecting the presence of an operator constant without being affected by the angle of inclination of a display surface of an image display device. SOLUTION: As shown in Figure (a), the image display device 1 positions a display surface 2a of a display means 2 to an arbitrary angle of inclination by oscillation of a casing 3 relative to a pedestal 4. As shown in Figure (b), the human sensor 5, which is fixed with a light emitting element 6 of IR rays, etc., and a light receiving element 7 on a substrate 11 and is integrated and fastened with a bearing 12 in the upper part of the substrate 11, is formed and the top end thereof is hung turnably by a revolving shaft 16 fixed to the casing 3 not shown in the figures. While the human sensor 5 is held static, the axes of the light emitting element 6 and the light receiving element 7 are always nearly parallel. The luminous flux emitted from the light emitting element 6 transmits the window part 3b, is reflected by the surface of the operator' s body, again passes through the window part 3b and is made incident on the light receiving element 7. The quantity of this incident light does not change regardless of the angle of inclination of the display surface 2a and the sensitivity of the human sensor is kept constant at all times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an efficient method for detecting that an operator's body is located in front of an image display device used for a television receiver, a personal computer, a computer display and the like.

[0002]

2. Description of the Related Art Conventionally, in an image display device such as a personal computer or a workstation using a CRT or a liquid crystal display as a display means, it has been used to prevent burn-in of a display surface for displaying an image and to reduce power consumption. 2. Description of the Related Art There is known an image display device that automatically changes a display state of a display surface by erasing an image on the display surface or switching to an image for preventing image sticking, etc.

As a method of determining whether or not the image display device is in use, there is a case where the determination is made based on the presence or absence of an operator located in front of the image display device. That is, if the operator is present in front of the image display device, it is determined that the image display device is in use. Such a portion that detects the presence or absence of an operator is called a human sensor. As the human sensor, for example, a sensor including a light emitting element and a light receiving element is generally used. When the power of the apparatus is turned on, light rays such as infrared rays are emitted from the light emitting element in front of the image display apparatus, and the reflected light reflected on the surface of the operator's body only when the operator is in front of the display unit. Is incident on the light receiving element to detect that an operator is present in front of the display device.

The inclination of the display surface can be changed so that the operator can gaze at the display surface of the display means in a desired posture. Ordinarily, a posture holding mechanism is provided in which a housing for accommodating the display means swings back and forth with respect to the pedestal resting on the desk to change the angle of the display surface.
For example, in many cases, a hinge mechanism or the like is constituted by an upper portion of the base and a lower portion of the housing.

An example of the image display device will be described with reference to FIG. 4 (a) and 4 (b) show a projection view of a thin image display device 51 using a flat panel such as a liquid crystal as a display means, wherein FIG. 4 (a) is a front view, and FIG. FIG. (C) is CRT
Is shown as a sectional view cut at the center of another image display device 61 using as a display means, and FIG.
Is shown in a perspective view. (E) is a schematic diagram illustrating a path of infrared light emitted from the light emitting element 6 of the human sensor 55.

[0006] As shown in FIG.
1 is housed in a housing 53 that the display means 52 covers except for the display surface 52a. A light-transmitting window 53b is formed on the lower front side of the housing 53, and the housing 5 is located behind the window 53b.
A human sensor 55 to be described later is accommodated in the inside of the device 3. The lower end of the housing 53 is a hinge 53h, which is a part of the attitude holding mechanism 53a, and has a hole 53d. The hole 53d is perforated so as to be parallel to the display surface 52a of the display means 52. The pedestal 54 is placed horizontally on a desk or the like,
The shaft core 53c is inserted into a hole horizontally drilled substantially at the center of the two projections 54a, 54a and into the hole 53d of the hinge 53h. The housing 53 swings back and forth about the axis 53c, so that the inclination of the display surface 52a can be adjusted.

For convenience of explanation, the X-axis, Y-axis, and Z-axis of a common rectangular coordinate system are shown in each drawing of FIG. The Z axis is always vertical, the X and Y axes are horizontal, and the X axis is always parallel to the display surface of the display means. 4A and 4B, the pedestal 54 is placed horizontally, so that the axis 53c of the posture holding mechanism 53a is horizontal, and the axis 53c and the X axis are parallel. Posture holding mechanism 5
3a has a function of constantly rotating the display surface 52a of the display means 52 in parallel with the X axis, and maintaining the display surface 52a at an arbitrary inclination angle.

The image display device 61 shown in FIG. 4C is an example in which a CRT is used for the display means 62. Display means 62
A light-transmitting window 63b is formed in a part of a housing 63 covering a part other than the display surface 62a, and a human sensor 55 described later is housed on the inner rear surface thereof, which is the same as the previous example. When the display surface 62a is not a flat surface but a curved surface, for convenience, a tangent plane at a center point of the display surface is regarded as the display surface.

The image display device 61 includes a posture holding mechanism 6.
A convex spherical portion having a radius R and a center Q is formed on the bottom portion of the housing 63 as 3a, and a concave spherical portion 64a having substantially the same specifications as the convex spherical portion that can receive the convex spherical portion is formed on the base 64. . The sliding of the spherical portion of the unevenness causes the housing 6
3 can rotate in any direction with the vertical axis as the rotation axis, and the display surface 62a can make an arbitrary inclination with respect to the vertical plane. Here, since the X axis is determined parallel to the display surface 62a, the inclination of the display surface 62a can be determined as the movement of the display surface 62a having a rotation axis parallel to the X axis, as in FIG. 4B.

FIG. 4D shows an example of a human sensor for detecting the presence or absence of an operator on the front surface of the display surface 52a. FIG. 4D is a perspective view showing the vicinity of the window 53b of the image display device 51 described above. is there. A human sensor 55 is configured by combining a light emitting element 6 such as an infrared ray and a light receiving element 7 for receiving a light beam emitted from the light emitting element 6 and fixing the same to a common substrate 56. A light emitting diode that emits near infrared light is used for the light emitting element 6,
As the light receiving element 7, a phototransistor is used. In general, the light emitted from the light emitting diode is light having directivity. The light emitting diode may have a lens mounted in front of the light emitting portion. The degree of directivity is determined by the shape of the lens, the distance between the element and the lens, the material of the lens, and the like. Others exhibit sharp directivity such that the amount of light flux is reduced by half at a distance of several degrees from the direction of the strongest light flux). The angle from the axis to the line where the luminous flux amount is reduced by half is called the half-value angle.

A human sensor 55 is fixed to the housing 53 inside a housing 53 (not shown) behind the translucent window 53b. Although not shown, it is screwed to the inner surface of the housing 53 with a small screw inserted through a mounting hole provided in the substrate 56. The axis of the light emitting element 6 and the direction of the highest sensitivity of the light receiving element 7 constituting the human sensor 55 are indicated by the display means 5.
Substrate 56 so as to be perpendicular to the second display surface 52a.
Is fixed to the housing 53.

When the display surface 52a is vertical, the infrared light emitted from the light emitting element 6 travels substantially through the window 53b in the -Y direction, is reflected on the operator's body, and is again transmitted through the window 53b. The light passes through and reaches the light receiving element 7. When the reflected light is detected by the light receiving element 7, it is considered that an operator is present. In addition,
The window 63b of the image display device 61 shown in FIG. 9C has the same structure. When the window 53b in FIG. 9D is read as 63b, the window provided in the housing 63 in FIG. It becomes a perspective view near 63b.

FIG. 4 (e) shows the change in the path of the light beam emitted from the light emitting element 6 due to the inclination of the display surface.
The light-emitting element 6 is viewed from the X direction. In the figure, a plane parallel to the XZ plane is used as a rough approximation of the human body surface 19. The XZ plane and the display surface 52a are both perpendicular to the YZ plane. For example, the inclination angle of the display surface 52a is indicated by an angle θ that forms a vertical line. In the figure, the axis of the light emitting element 6 is indicated by a thin line, and the light beam corresponding to the half-value angle is indicated by a dashed line. Although not shown, the light receiving element 7 is at the same height as the light emitting element 6 and is arranged at a certain distance in the X direction. The light beam emitted from the light emitting element 6 travels straight and reaches the human body surface 19, is reflected and enters the light receiving element. (E) The lower diagram shows the case where the inclination of the display surface 52a is 0, that is, the display surface 52a is vertical, and the light beam emitted from the light emitting element 6 is reflected on the human body surface 19 and is reflected on the light receiving element 7. The light beam having the maximum intensity at the axis is incident.

If the display surface 52a is inclined by an angle θ ° as shown in the upper part of FIG. 3E, the light beam emitted from the light emitting element 6 is incident on the human body surface 19 at an angle of θ °, reflected and reflected by the light receiving element. When the light beam reaches 7, since the outside of the light beam near the half-value angle off axis is incident, the intensity of the light beam is reduced to almost half, and the illuminance around the light receiving element is almost reduced by half. Since the light receiving element 7 outputs an output according to the surrounding illuminance, it is considered that the distance between the human sensor and the operator's surface is almost constant. Needs to be incident near the light receiving element.

If a light-emitting element having a large half-value angle is employed, in a state where the light-emitting element is normally used while sitting on a chair in front of a desk in an office, the above-mentioned inclination angle θ is not so large, and the light-receiving element becomes undetectable. The reflected light from the human body of the operator does not decrease. Therefore, for normal use, the emission or incidence direction of the light emitting element 6 and the light receiving element 7 is determined by the display surface 52.
The optimal direction of the axis of the light emitting element is determined by correcting the shape of the human body surface perpendicular to a or experimentally or assuming the inclination angle of the display surface 52a that is used most often. That is, when the display surface 52a is vertical, the light-emitting element 6 and the light-receiving element 7 may be fixed with their axes of highest sensitivity horizontal or slightly inclined from horizontal.

[0016]

However, recently, so-called personal computers have been used more frequently in ordinary households,
Compared to the conventional use in offices, the use form has become widespread, such as relaxing listening to music or sitting on the floor. Accordingly, the inclination angle of the display surface of the display unit of the image display device tends to increase. As described above, when the tilt range of the display surface is enlarged, when the human sensor is fixed perpendicularly or nearly perpendicularly to the conventional display surface, the deviation between the normal line of the human body surface and the maximum sensitivity axis of the human sensor increases, and It has become difficult to obtain sufficient sensitivity because the amount of reflected light incident on the element decreases or the angle of incidence on the light receiving element changes drastically. That is, there is a problem that the detection range of the human sensor cannot catch up with the actual use range of the inclination of the display panel surface.

In order to widen the detection range of the human sensor, a method for improving an optical system using a lens for diffusing radiated light in front of the light emitting element, or using a condenser lens in front of the light receiving element, Although an electronic circuit strengthening method for increasing the subsequent amplification factor is also conceivable, any of these methods has a disadvantage that a considerably complicated member is added and the cost is increased.

[0018]

According to the present invention, a display means for displaying an image, a housing supporting a peripheral portion of an image display surface of the display means, and a display means are provided. In an image display device having a posture holding mechanism for holding the camera in a forward and backward direction, a translucent window portion opened in front of a housing and a person who detects presence or absence of a person through the window portion behind the window portion. Provided is an image display device in which a sensor is arranged and a component of the human sensor is rotatably suspended. Further, in this image display device, the image display surface of the display means, the axis of the attitude holding mechanism, and the rotation axis of the human sensor are arranged so as to be parallel to each other.

Further, the image display device is provided with a stopper for restricting a rotation range of the human sensor in the front-rear direction. Further, the constituent members of the human sensor of the image display device include at least one of a light emitting element that emits infrared light and an infrared light receiving element. Furthermore, in the human sensor of this image display device, the axis of at least one of the light emitting element or the light receiving element, which is a constituent member of the human sensor, is inclined horizontally or at a predetermined angle around the horizontal.

At least one light-emitting element or light-receiving element constituting a human sensor disposed inside the housing is always kept horizontal or at a position inclined at a predetermined angle from horizontal regardless of the inclination of the display surface. Therefore, the infrared light emitted from the light emitting element is efficiently reflected on the human body and reaches the light receiving element, preventing a decrease in infrared light due to an inappropriate reflection angle on the human body surface,
It is not necessary to use a device for optically or electrically condensing and amplifying infrared light.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An image display device according to an embodiment of the present invention will be described with reference to FIG. FIG. 1A is a perspective view showing the appearance of an image display device 1 according to an embodiment of the present invention, and FIG. 1B is a partial perspective view showing the structure of a human sensor. 1 is an external view of the image display device 1 using a liquid crystal, a CRT, or the like as the display unit 2. The housing 3 supports the display means 2 on the periphery of the display surface 2a for displaying an image, and has a window 3b formed as a rectangular hole on the outer periphery (lower side in the figure) of the display surface 2a of the housing 3. Have been. Window 3
b, a human sensor 5 described later is provided inside the housing 3.
(Not shown) are accommodated.

The lower end of the housing 3 is a hinge 3h, which is a component of the attitude holding mechanism 3a, and has a horizontal hole 3d (not shown). The pedestal 4 is placed horizontally on a desk or the like, and penetrates a hole formed horizontally at substantially the center of the two projections 4a, 4a and a hole 3d of the hinge portion 3h, and serves as an axis of rotation of the hinge. 3c is inserted. The housing 3 swings back and forth about the axis 3c, so that the display surface 2a has an arbitrary inclination.

1 (a) and 1 (b), the origin O and three axes X, Y and Z of a common rectangular coordinate system are shown. The direction of the arrow indicates the + side of each coordinate axis. The Z axis is always vertical, and the X and Y axes are horizontal. In the example of the above-mentioned figure (a), the X axis is determined so as to be parallel to the display surface 2a of the display means 2 and the axis 3c with the pedestal 4 placed horizontally. Here, along the Y axis, when viewed from the coordinate origin O, the −Y axis direction is referred to as front, and the + Y axis direction is referred to as rear, for distinction. The operator is located in front of the display surface 2a and faces the display surface 2a. The X axis is perpendicular to the YZ plane including the Y axis and the Z axis,
As described above, since the display surface 2a of the display means 2 and the axis 3c of the attitude holding mechanism 3a are parallel to the X axis, the display surface 2a and the axis 3c are perpendicular to the YZ plane.

FIG. 1B shows an example of the human sensor 5.
Cuts out the vicinity of the window 3b of the image display device 1 described above,
It is the perspective view which showed the human sensor 5 behind the translucent window part 3b. A human sensor 5 is accommodated in the housing 3 behind the translucent window 3b. The window 3b formed in the housing 3 may be simply a hole formed in the housing 3, or the hole may be covered with a translucent member. In practice, it is desirable to cover with a translucent member for dust prevention and danger prevention.

The human sensor 5 has the following configuration. A light emitting element 6 such as an infrared ray and a light receiving element 7 are fixed to a substrate 11. In the illustrated example, the rivet 12
The bearing 12 is fixed to the upper part of the substrate 11 by a and 12a. A bearing hole 13 is formed in the upper part of the bearing 12 in parallel with the substrate surface. As described above, the light emitting element 6, the light receiving element 7, the substrate 11, and the bearing 12 are combined and integrally form the human sensor 5. The light emitting element 6
The light receiving element 7 may be equipped with optical lenses 6a and 7a.

A rotating shaft 16 passes through the bearing hole 13 of the human sensor 5 described above. The outer diameter of the rotating shaft 16 is made slightly smaller than the inner diameter of the bearing hole 13 so that the human sensor 5
Is rotatable about a rotation axis 16. The left end of the rotating shaft 16 is press-fitted and fixed to the distal end of the rotating shaft mounting portion 3e, and the right end is bent, for example, at a right angle to prevent the human sensor 5 from coming off. Here, the root portion 3 of the rotating shaft mounting portion 3e
5 is connected to the inner surface of the housing 3 and is integrated,
After all, the housing 3, the rotating shaft mounting portion 3e, and the rotating shaft 16 may be regarded as one body. Since the rotating shaft 16 is press-fitted so as to be parallel to the X-axis, the rotating shaft 16 is always fixed to the X-axis even if the housing 3 is tilted forward and backward about the axis 3c parallel to the X-axis of the posture holding mechanism 3a. Parallel to the axis. Therefore, each point constituting the human sensor 5 rotates on a plane perpendicular to the X axis (a plane parallel to the YZ plane).

FIGS. 2A and 2B are projection views of the human sensor 5 shown in a perspective view in FIG. 1, wherein FIG. 2A is in the + Y-axis direction, and FIG. It is projected. G indicates the center of gravity of the human sensor 5 in which the constituent members are integrated, and when the human sensor 5 is stopped, the center of gravity G as shown in FIG.
Is directly below the rotation shaft 16. Even if the housing 3 is rotated about the axis 3c as the rotation center and the attitude of the display surface 2a is changed, the human sensor 5 vibrates, and the center of gravity G is eventually changed to the rotation axis 16a.
Stop at a position directly below the. As described above, the light emitting element 6 and the light receiving element 7 have the lenses 6a and 7a
In some cases, the distribution of the luminous flux of the emitted light shows a sharp directivity, so that the axis of the light emitting element 6 (the direction of the strongest luminous flux to be emitted) is, as shown in FIG. It is often set to a predetermined horizontal or slightly inclined from the horizontal. Here, when the light receiving element has directivity, the direction of the maximum sensitivity of the incident light beam is also referred to as the axis.

As described above, the axis of the light emitting element 6 constituting the human sensor 5 tilts the housing 3 and the display surface 2 of the display means 2.
Even if a is inclined, the set direction can always be maintained. As described above, if the surface of the human body of the operator is regarded as a vertical plane, the light flux reflected therefrom and incident on the light receiving element always gives a constant illuminance near the light receiving element 7 regardless of the inclination of the display surface 2a. be able to.

As a countermeasure when the housing 3 is tilted excessively, the rotation of the human sensor 5 at a certain value or more is limited, and the output of the human sensor 5 is cut off at the same time. As shown in FIG. 2, a stopper 10 is provided to limit the rotation of the human sensor 5 with respect to the housing 3. The stopper 10 is, for example,
The lower side is formed integrally with the housing 3 (not shown), and protrudes from the housing 3. The stopper 10 has protrusions 10a and 10b on the upper left and right sides thereof, and the lower side of the substrate 11 is disposed between the protrusions 10a and 10b. For case 3,
When the human sensor 5 rotates by a predetermined angle or more, the lower side of the substrate 11 abuts on the inside of the protrusions 10a and 10b of the stopper 10, thereby limiting further rotation of the human sensor 5.
Since it is easy to electrically or mechanically detect that the human sensor 5 and the stopper 10 are in contact with each other, when the movement of the human sensor 5 is restricted, a detection circuit for detecting the presence of the operator is stopped. Take action.

The human sensor 5 performing such a movement may be considered to have properties equivalent to a physical pendulum. FIG. 2 (c)
Is a schematic diagram of a physical pendulum, in which a hole is made at a position distant from the center of gravity G of the rigid body 15, the axis L on the X axis is passed through this hole, and the rigid body 15 is suspended. The rigid body 15 that can freely rotate around the axis L in parallel with the YZ plane is called a physical pendulum 14. As we all know,
It can be considered that the entire mass of the rigid body 15 is concentrated on the center of gravity G and the weight mg works vertically. If the rigid body 15 is tilted and separated by a small angle φ as shown by a broken line, a vertical plane (ZX
It vibrates at a constant period around the center of vibration. Eventually, due to friction with the axis L and air, the center of gravity G comes to a stand in a vertical plane including the rotation axis L. That is, at the time of rest, the center of gravity G is immediately below the rotation axis, and each part of the rigid body 15 always occupies the same position. A straight line passing through two points belonging to the rigid body 15 shows the same direction at the same position when the line is stationary.

The human sensor 5 shown in FIGS. 2A and 2B
Also, the members constituting the human sensor 5 are connected and fixed, and can be generally regarded as a rigid body. Since the rotating shaft 16 is provided far from the center of gravity G of the human sensor 5, it can be considered that the rotating shaft 16 is equivalent to the above-described physical pendulum 14. Therefore, when the human sensor vibrates and stops, the center of gravity G is immediately below the rotation shaft 16, and the posture of each component is always constant. The axis of the light emitting element 6 is also oriented in a predetermined direction. As described above, if the human sensor 5 is considered to be equivalent to the physical pendulum 14, one of its components is that the members constituting the human sensor 5 are connected and fixed, and the other is that the human sensor 5 is rotated. That is, the shaft 16 is provided at a position avoiding the center of gravity G of the human sensor 5.

Incidentally, when the axes of the light emitting element 6 and the light receiving element 7 which are components of the human sensor 5 are arranged horizontally,
The approximation method described above with reference to FIG. 4E using the human body surface 19 of the operator as a vertical plane is used. As a higher approximation, if the human body surface is regarded as a surface with specific irregularities and if infrared light is reflected at a specific position, the human sensor is adjusted so that the normal line of the reflection point and the axis of the light emitting element coincide. The axis of the light emitting element 6 can be set to be inclined from the horizontal when the device 5 is at rest.

The mechanical structure and the like of each part can be arbitrarily changed. For example, in the case of FIGS. 2A and 2B, a total of two rotating shaft mounting portions 3e may be used on the left and right sides of the human sensor 5, and the rotating shaft 16 is fixed to the human sensor 5 and the housing is rotated. It may be formed as a bearing having a diameter larger than the diameter of the shaft 16. Further, even if the substrate 11 and the bearing 12 are formed as one integrated member from the beginning, there is no difference in terms of function. Further, if a small screw is used instead of a fixed rivet or adhesive for coupling each member, each member can be separated, but it will not function unless it is fixed with a small screw during operation as a human sensor. Therefore, even if the fixing method is separable later, it can be regarded as one rigid body during use.

Referring to FIG. 3, another embodiment in which each part of the human sensor is changed will be described. If the allowable range of the direction of the light beam incident on the light receiving element is relatively large (the directivity is weak), only the light emitting element 6 is rotated with respect to the housing 3 and the light receiving element is fixed to the housing. Even so, the desired effect can be obtained. 3 (a) and 3 (b) are projection views of the human sensor 5a for explaining one example, where (a) is in the + Y-axis direction and (b) is-.
Projection is in the X-axis direction. A substrate 1 on which a substrate portion for mounting the light emitting element 6 and a member for suspension are integrally formed.
The pivots 17, 17 project from the left and right of the upper part of 1a, and the light emitting element 6 is installed at the lower part. The substrate 11a is bent in the middle, and when the center of gravity G is located immediately below the rotation axis formed by the pivots 17, 17, the emission direction of the light emitting element 6 has a predetermined inclination of θ ゜ from the horizontal line. This is based on the assumption of the above-mentioned uneven human body surface.

For example, two pivot receivers 18, 18 are simultaneously formed integrally with the inside of the resin housing 3 when the housing 3 is molded, and the pivots 17, 17 are provided on the opposing inner surfaces.
Is provided. Pivot receiver 18, 18
To the left and right, and the pivots 17 and 17 are inserted.
This human sensor 5a is also a physical pendulum, and the rotation angle of the human sensor 5a can be limited by forming a stopper 10 indicated by a dashed line on the housing 3 and arranging it before and after the lower end of the substrate 11a.

In general, the housing 3 is often manufactured by injection molding using a mold. As in the present invention, in order to add a rotating shaft mounting portion 3e, a bearing portion such as a pivot receiver 18, a stopper 10 or the like to the back of a window inside the housing 3, it is necessary to add these female members to a mold. By engraving the shape of, the casing 3 can be integrally molded at the time of molding, so that a small addition is required in terms of cost.

FIGS. 3 (c) and 3 (d) show another embodiment as a projection view of the human sensor 5b. The projection directions are (c) in the + X-axis direction and (d) in the + Y-axis direction. Here, the constituent members of the human sensor 5b include a light emitting element 6, a light receiving element 7,
The bearing 12 is the same as the components of the human sensor 5 shown in FIGS. 2A and 2B, and the substrate 11b is the substrate 1 shown in FIG.
Only a rivet hole for attaching the limiting member 9 to 1 is added. A restricting member 9 that contacts the stopper 10 protruding from the housing 3 and restricts the movement of the human sensor 5c is fixed to the substrate 11. As described above, even if the exclusive limiting member 9 is provided, the function does not change even if a part of the member for another use is used as the limiting member.

Regardless of the inclination of the display surface 2a, the human sensor 5 always faces in one direction, so that the height (upper and lower widths) of the window 3b is smaller than when the human sensor 5 is fixed to the display means.
Need to be wide. This can be easily known by calculation or drawing based on the distance from the housing surface to the human sensor and the inclination angle before and after the display surface. The position of the window 3b is displayed on the display surface 2.
When moving from the lower part of a to the left and right sides or when the width of the left and right sides is too small to arrange the light emitting element and the light receiving element along the X axis, it is necessary to consider the arrangement of the light emitting and light receiving elements up and down. Become.

Further, in the embodiment of the present invention, a thin display means such as a liquid crystal is used as the display means. However, the present invention is not limited to this. For example, FIG. As described above, the display means is C
It can be RT. Also, an example has been described in which a light emitting element and a light receiving element are used as a human sensor. However, it is also possible to omit the light emitting element and use only an infrared sensor that responds to heat (infrared rays) generated from a human body as a human sensor.

[0040]

As described above, according to the present invention, even if the range of use in front of and behind the display surface is expanded, a human sensor capable of accurately detecting the presence or absence of an operator in front of the display surface is provided. Whether the device is used or not can be detected in a wide range. For this reason, even if the inclination of the display surface becomes larger than before, it is possible to detect the human sensor, and a great effect can be expected in reducing the power consumption of the apparatus and extending the life of the display means. In addition, by providing a stopper for the human sensor for the inclination exceeding the usage limit of the display surface, measures such as disconnecting the detection circuit can be adopted, and at the same time, excessive movement of the human sensor during transport movement is suppressed. Therefore, the failure prevention effect of the human sensor itself can be expected.

Further, the present invention can be carried out by partially engraving a mold for molding a housing or by adding a small number of plastic parts or the like.
Compared with the enhancement of the optical system, it can be realized at low cost, which is a considerable effect.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an appearance of an image display device and a human sensor according to an embodiment of the present invention.

FIG. 2 is a projection view showing a human sensor according to an embodiment of the present invention and an explanatory diagram of a physical pendulum.

FIG. 3 is a projection view illustrating another structural example of the human sensor portion of the present invention.

FIG. 4 is a schematic diagram illustrating a conventional image display device and a human sensor.

[Explanation of symbols]

1 image display device, 2 display means, 2a display surface, 3
Housing, 3a posture holding mechanism, 3b window, 3c axis,
3d shaft core hole, 3e rotating shaft mounting part, 3f base, 3g
Rotating shaft fixing part, 3h hinge part, 4 pedestal, 4a projection, 5 person sensor, 6 light emitting element, 7 light receiving element, 6
a, 7a lens, 9 limiting member, 10 stopper, 1
1, 11a substrate, 12 bearing, 12a rivet,
13 bearing hole, 14 physical pendulum, 15 rigid body, 1
6, L rotation axis, 17 pivot, 18 pivot receiver,
19 human body surface,

Claims (5)

[Claims] 1. A display device for displaying an image, a housing supporting a peripheral portion of an image display surface of the display device, and a posture holding mechanism for holding the display device at an angle in a front-rear direction. In the image display device, a translucent window portion opened in front of the housing, and a human sensor that detects the presence or absence of a person through the window portion is disposed behind the window portion, and a constituent member of the human sensor An image display device characterized by being rotatably suspended. 2. The image display surface of the display unit, an axis of the posture holding mechanism, and a rotation axis of the human sensor,
The image display device according to claim 1, wherein the image display devices are arranged so as to be parallel to each other. 3. The image display device according to claim 2, wherein a stopper is provided to restrict a rotation range of the human sensor in the front-rear direction. 4. The image display device according to claim 1, wherein the constituent members of the human sensor include at least one of a light emitting element that emits infrared light and an infrared light receiving element. 5. The apparatus according to claim 4, wherein an axis of at least one of the light emitting element or the light receiving element, which is a constituent member of the human sensor, is tilted horizontally or at a predetermined angle around the horizontal. Image display device.