JP2005058399A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device which enables the recognition of a dangerous situation to the human beings by detecting unnatural conditions of the eyes. <P>SOLUTION: When an input is given to a controller while a user keeps gazing at a target point before the mounting of prism glasses 2, the controller is imaged with an imaging device 4 at the moment and the interval between the pupils of the user calculated by a control part of the imaging device is inputted. After the use of the display device, the prism glasses 3 are taken off by the user, and an input is given to the controller while the user keeps gazing at the target point, the controller is imaged with the imaging device 4 at the moment and the interval between the pupils of the user calculated by the control part of the camera is inputted. The interval between the pupils previously measured before the use of the display device is compared with that measured after the use of the display device. Thus, when the difference between both the intervals exceeds a prescribed value, an alarm is generated through an alarming device. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a display device that allows a person watching a display to perceive a three-dimensional display.

  Human vision perceives the distance to the object by both the distance to the object determined by the convergence angle of both eyes when viewing the object being viewed with both eyes and the focus adjustment function of the lens. It is said that there is. Therefore, when an image having a three-dimensional structure is originally formed on a plane, it cannot be perceived as having a three-dimensional structure.

  However, the distance to the object determined by the vergence angle of both eyes (referred to in the claims and herein as “convergence distance”) and the distance to the object determined by the focusing action of the lens (actual It is known that an image formed on a plane is perceived as having a three-dimensional effect when the image is formed differently from the scope of the claims and the present specification. An apparatus for recognizing an image formed on a plane as a stereoscopic image by utilizing this fact is described in, for example, Japanese Patent Laid-Open No. 4-146212 (Patent Document 1).

  An outline of the device described in Patent Document 1 is shown in FIG. In FIG. 3, (a) is a diagram when the point P on the plane 21 is viewed in a normal state. At this time, the half angle θ formed by the line of sight of the right eye 22R and the left eye 22L is the convergence angle. The light ray emitted from the point P goes straight as indicated by the solid line and enters the right eye 22R and the left eye 22L, so that the distance from the eyeball to the point P perceived according to the convergence angle and the point P is focused. The distances from the eyeball to the point P perceived by the expansion and contraction of the crystalline lens for matching match with each other at d, whereby the point P on the plane is perceived as being on the plane 21.

  (B) is a figure which shows the case where the prism 23 is each placed in front of the right eye 22R and the left eye 22L. At this time, the light ray emitted from P is refracted by the prism 23 and reaches the eyeball. That is, light rays as indicated by broken lines enter the right eye 22R and the left eye 22L from the point P, respectively. Accordingly, the line of sight of both eyes is as shown by the alternate long and short dash line, the convergence angle is θ ′, and it is perceived that the object P exists at the intersection P ′ of the lines of sight of both eyes. Therefore, the distance determined by the convergence angle is d '.

  However, on the other hand, since the distance from the point P to both eyes hardly changes, the distance from the eyeball to the point P perceived by the expansion and contraction of the crystalline lens to focus on the point P is d. . Accordingly, a divergence occurs between the distance d ′ perceived by the convergence angle and the distance d perceived by focusing on the point P.

In such a case, it is well known that even though the image is on the plane 21, it is recognized as being three-dimensional, that is, having a depth. According to the point of view, since the position of the image cannot be clearly recognized, the observer will be able to demonstrate the perspective function of the perspective that the two-dimensional image originally has. There is a description that it is perceived as an image.
JP-A-4-146212

  However, if such a display device has been used for a long time, the ability to adjust the focus of the crystalline lens and the ability to recognize the target point as one point by adjusting the convergence angle of the left and right eyes will differ. When the use of the display device is stopped, the visual object may appear blurred or doubled. There is an individual difference until this state is recovered, but in the case of a long time, it may take more than one hour. It is dangerous to walk in such a state, and it is necessary to avoid driving a car.

  This means has been made in view of such circumstances. When the display device as described above is used, it is detected that the eye is in an unnatural state and is in danger to humans. It is an object of the present invention to provide a display device capable of recognizing.

  The problems include an image forming apparatus that forms an image on a plane, a convergence distance from the eyeball to the image that is attached to a human body and corresponds to a state of convergence of the eyeball, and an actual observation distance from the eyeball to the image A display device having an optical system that has a function of differentiating between a pupil distance measuring device that measures the pupil distance between both eyes and a control device, the control device comprising: The pupil distance output by the pupil distance measurement device when the target point to be visually observed is formed on the surface on which the image is formed and when the target point is visually observed before and after the display device is used. The display device has a function of issuing an alarm when the difference between the pupil interval after using the display device and the pupil interval before using the display device is greater than or equal to a predetermined value. (Claims ) It is solved by.

  In general, when a display such as that described above is used, the pupil spacing when a certain point is looked after is different from the pupil spacing when the same point is looked before use. Therefore, if the difference between the two is measured by the pupil distance measuring device and an alarm is issued when the difference is greater than or equal to a predetermined value, the user can notice the abnormal state of the eyes and avoid danger. It becomes possible.

  As described above, according to the present invention, it is possible to provide a display device that can detect that an eye is in an unnatural state and recognize a human being in a dangerous state. it can.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of a state in which a display device as an example of an embodiment of the present invention is used as viewed from above. The image display device 1 constituting the display device is a two-dimensional image display device such as a liquid crystal display or a plasma display, and displays a dimensional image in a vertical plane. This image is observed by a person 3 wearing the prism glasses 2.

  On the upper surface of the image display device 1, an imaging device 4 is attached at a position that does not block the visual field of the image. As the imaging device 4, a digital imaging device such as a CCD camera or a video camera can be used. When the display device is used, the head of the person 3 wearing the prism glasses 2 enters the field of view of the imaging device 4 indicated by a broken line. The image display device 1 and the imaging device 4 are coupled to a control device (not shown).

  If the user inputs the start of use of the display device to the control device before wearing the prism glasses 2, the control device displays an image as shown in FIG. That is, on the display screen of the image display device 1, the target point 5 and a message “please look at this point” are displayed. When the user performs an operation indicating that the user is gazing at the target point 5 while gazing at the target point 5, the control unit of the imaging apparatus calculates the pupil distance of the user, Enter the pupil distance.

  That is, the control unit of the imaging device 4 detects the pupil position of both eyes from the captured image by image processing, and measures the distance between them. However, the distance between the pupils cannot be known only from the pupil position in the captured image. This is because even if the inter-pupil distance is the same, the imaged pupil interval varies depending on the distance between the imaging device 4 and the eyeball. In this case, the imaging device 4 has an automatic focus adjustment function, and the automatic focus adjustment function can calculate the distance between the imaging device 4 and the eyeball. Therefore, the control device of the imaging device 4 can measure the distance between the pupils of the user regardless of the distance between the imaging device 4 and the eyeball.

  After the user uses the display device, when the user removes the prism glasses 3 and performs an operation indicating the end of observation on the control device, the control device displays a display as shown in FIG. 2 on the image display device 1 again. . Therefore, when the user performs an operation indicating that the user is looking at the target point 5 while the user is looking at the target point 5, the control unit of the imaging device calculates the pupil distance of the user, Inputs the pupil interval.

  Then, the control device compares the pupil interval measured before using the display device with the pupil interval measured after using the display device. Alarm. This alarm may be displayed on the image display device 1, or any other known means such as an alarm by sound can be employed. Thereby, since the user can perceive that the state of his / her eyes is abnormal, it becomes possible to avoid danger.

It is the schematic which looked at the state which is using the display apparatus which is an example of embodiment of this invention from upper direction. It is a figure which shows the example of the target point and message which are displayed on an image display apparatus. It is a schematic diagram which shows the structure of the conventional display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Image display apparatus 2 ... Prism eyeglasses 3 ... Human 4 ... Imaging device 5 ... Target point

Claims (1)

An image forming apparatus that forms an image on a plane, and a convergence distance from the eyeball to the image that is attached to a human body and corresponds to a state of convergence of the eyeball, and an actual observation distance from the eyeball to the image are made different. A display device having an optical system having an action, which includes a pupil distance measuring device that measures the pupil distance between both eyes and a control device, and the control device forms an image of the image forming device. A target point to be visually observed on the surface to be compared, and compare the pupil interval output by the pupil interval measurement device when the target point is visually observed before and after using the display device, A display device having a function of issuing an alarm when a difference between a pupil interval after using the display device and a pupil interval before using the display device is a predetermined value or more.

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