JP2008191399A - Stereoscopic display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a good stereoscopic image, regarding a stereoscopic display device utilizing the parallax of human both eyes. <P>SOLUTION: The stereoscopic display device includes: a half mirror 10 which has an upper end fixed to the upper front of an observation window 11, and has a lower end fixed to the lower depth of the observation window 11; a first liquid display device 40L which is arranged at the rear of the half mirror 10, and displays an image for one eye; and a second liquid crystal display device 40R which is arranged below the half mirror 10, displays an image for the other eye, and has the same polarizing direction as that of the first liquid crystal display device 40L. A viewing axis 13 is made perpendicular to the center of the screen of the first liquid crystal display device 40L, and the center of the screen of the second liquid crystal display device 40R is overlapped with the viewing axis 13 at the half mirror 10. A 1/2 wavelength plate 41 is arranged at least on a screen of one of the first and the second liquid crystal display devices 40L and 40R, consequently, regarding the images obtained from the first and the second liquid crystal display devices 40L and 40R, the polarizing direction of one image obtained through the half mirror 10 is made horizontal, and the polarizing direction of the other image is made perpendicular. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a stereoscopic display device using the parallax between human eyes.

  Conventionally, the thing of patent document 1 is disclosed as a three-dimensional display apparatus using parallax of human eyes. The stereoscopic display device described in Patent Document 1 will be described with reference to FIG.

  In FIG. 6, 1 is a subject, 2a and 2b are left-eye and right-eye cameras installed at the positions of the left eye and right eye, respectively, and 3 is a scanning direction inversion circuit that reverses the scanning direction connected to the right-eye camera 2b. And 4b are left-eye and right-eye displays of the same size, which are arranged at positions symmetrical with respect to a plane (45-degree plane) that divides the angle into two equal parts (45-degree plane). is there. The left-eye display 4a is connected to the left-eye camera 2a, and the right-eye display 4b is connected to the scanning direction inversion circuit 3.

  Reference numerals 5a and 5b denote left-eye display polarizing plates and right-eye display polarizing plates disposed in front of the display surfaces of the left-eye and right-eye displays 4a and 4b, respectively, in parallel with the display surfaces. It has a polarization angle of degrees.

  Reference numeral 6 denotes a half mirror having the same transmittance and reflectance. The half mirror 6 is a front surface of the polarizing plates 5a and 5b and a surface that bisects the angle formed by both the polarizing plates 5a and 5b (45 degree surface). It is installed on the top.

  7a and 7b are left-eye and right-eye polarizing plates provided to the viewer 8, the left-eye polarizing plate 7a has a polarization angle of 45 degrees to the left with respect to the vertical direction, and the right-eye polarizing plate 7b is with respect to the vertical direction. It has a right 45 ° polarization angle.

  In FIG. 6, the left-eye camera 2a that captures the subject 1 at the position of the left eye sends the signal to the left-eye display 4a, and the left-eye display 4a displays the video.

  On the other hand, the right-eye camera 2b that captures the subject 1 at the position of the right eye sends the signal to the scanning direction inversion circuit 3, and the scanning direction inversion circuit 3 displays the image when the signal is displayed on the right-eye display 4b. The signal processing is performed so that the left side and the right side are reversed, and the signal is sent to the right-eye display 4b. The right-eye display 4b displays an image whose left and right are reversed.

  The image light displayed on the left-eye display 4a passes through the left 45-degree polarizing plate 5a for the left-eye display to become left 45-degree linearly polarized light, and passes through the half mirror 6 in the left 45-degree linearly polarized state.

  Further, the image light displayed on the right-eye display 4b passes through the right-eye display left 45-degree polarizing plate 5b to become left 45-degree linearly polarized light, and is reflected by the half mirror 6 to become right-45-degree linearly polarized light.

  Here, an observer 8 who has left-eye and right-eye polarizing plates 7a and 7b in front of the left-eye and right-eye in parallel with the display surface of the left-eye display 4a is spaced a certain distance from the front of the left-eye display 4a. When standing, the image light that has become the left 45-degree linearly polarized light coming from the left-eye display 4a passes through the left 45-degree polarizing plate 7a attached to the left eye and reaches the left eye.

  Also, the image light that has become the right 45-degree linearly polarized light coming from the right-eye display 4b passes through the right 45-degree polarizing plate 7b attached to the right eye and reaches the right eye, so that the viewer 8 experiences a three-dimensional effect with the parallax of both eyes. be able to.

  Moreover, the thing of patent document 2 is disclosed as a three-dimensional display apparatus using the parallax of human eyes. The stereoscopic display device described in Patent Document 2 will be described with reference to FIGS. 7, 8, and 9. FIG.

  FIG. 7 is a block diagram showing the overall configuration of this conventional stereoscopic display device. In FIG. 7, reference numeral 10 denotes a square half mirror having the same transmittance and reflectance, and the upper end of the half mirror 10 is positioned at the observation window. 11 and the lower end of the half mirror 10 is fixed to the lower back of the observation window 11 so that the half mirror 10 forms a 45-degree plane in the front direction with respect to the horizontal plane. .

  A liquid crystal display device 12L having a polarization direction of 45 degrees to the left for fixing a left-eye screen that is perpendicular to the horizontal plane is fixed behind the half mirror 10 on the side opposite to the observation window 11 side. In this case, the upper side of the liquid crystal display device 12L corresponds to the upper side of the observation window 11, and the lower side of the liquid crystal display device 12L corresponds to the lower side of the observation window 11.

  A liquid crystal display device 12R having a polarization direction of 45 degrees to the left is displayed below the half mirror 10 to display a right-eye screen whose screen is horizontal with respect to a horizontal plane. In this case, the upper side of the liquid crystal display device 12R is positioned on the near side, and the lower side of the liquid crystal display device 12R is positioned on the back side.

  In FIG. 7, the visual axis 13 in the observation window 11 is set to be perpendicular to the center of the screen of the liquid crystal display device 12L that displays the screen for the left eye, and the center of the screen of the liquid crystal display device 12R that displays the screen for the right eye. Is overlapped with the visual axis 13 by the half mirror 10.

  The liquid crystal display devices 12L and 12R in FIG. 7 have the same configuration, and the structure is shown in FIG. Referring to FIG. 9, in FIG. 9, reference numerals 30a and 30b denote transparent glass substrates, and a color filter 31 is provided on the surface of the glass substrate 30a facing the glass substrate 30b.

  Transparent electrodes 32a and 32b such as ITO are provided on the color filter 31 and the surface of the glass substrate 30b facing the color filter 31, and alignment films 33a and 33b are provided on the transparent electrodes 32a and 32b. The liquid crystal material 34 is sealed between 33b. Reference numeral 35 denotes a sealing material.

  Further, polarizing plates 36a and 36b are provided on the surfaces of the glass substrates 30a and 30b that are not opposed to each other, a backlight 37 is provided on the side of the polarizing plate 36b that is not in contact with the glass substrate 30b, and light from the backlight 37 is liquid crystal. Switching is performed by the material 34.

  Next, video signals supplied to the liquid crystal display devices 12L and 12R in FIG. 7 will be described with reference to FIG. In FIG. 8, reference numeral 20 denotes a subject, and 21L and 21R denote left-eye and right-eye cameras such as a digital still camera and a video camera, which are installed at a left eye position and a right eye position, for example, 7 cm horizontally.

  The video signal captured by the left-eye camera 21L is supplied to the left-eye liquid crystal display device 12L via the video amplification circuit 22L, and the video signal captured by the right-eye camera 21R is connected in series to the scanning direction inversion circuit 23 and the video amplification circuit 22R. This is supplied to the right-eye liquid crystal display device 12R through the circuit.

  In FIG. 7, 15 is polarizing glasses worn by an observer, 15L and 15R are polarizing plates for left eye and right eye, and the polarizing plate for left eye 15L has a polarization angle of 45 degrees to the left in the vertical direction, and is for right eye. The polarizing plate 15R has a polarization angle of 45 degrees to the right in the vertical direction.

  Next, the operation of FIG. 7 will be described. The left-eye video signal from the left-eye camera 21L that captures the subject 20 at the position of the left eye is supplied to the left-eye liquid crystal display device 12L, and the left-eye video signal is displayed on the left-eye liquid crystal display device 12L.

  On the other hand, the right-eye video signal from the right-eye camera 21R that images the subject 20 at the position of the right eye is supplied to the scanning direction inversion circuit 23. The scanning direction inversion circuit 23 displays the video signal on the liquid crystal display device. Then, processing is performed so that the left side and the right side of the video are inverted, and this video signal is supplied to the right-eye liquid crystal display device 12R, and the right-eye liquid crystal display device 12R displays the video whose left and right sides are inverted.

  In this case, the image light from the left-eye liquid crystal display device 12L is 45-degree linearly polarized light to the left, passes through the half mirror 10 in the state of 45-degree left, and the image light from the right-eye liquid crystal display device 12R is straight to the left 45-degree. Although it is polarized light, it is reflected by the half mirror 10 and becomes right 45-degree linearly polarized light.

Here, when the observer observes the observation window 11 with the left-eye and right-eye polarizing plates 15L and 15R attached, the left 45-degree linearly polarized image light coming from the left-eye liquid crystal display device 12L is left eye-attached to the left eye. Passes through the polarizing plate 15L and reaches the left eye. On the other hand, the right 45-degree linearly polarized image light coming from the right-eye liquid crystal display device 12R passes through the right 45-degree polarizing plate 15R attached to the right eye and reaches the right eye, so that the observer experiences a stereoscopic effect with the parallax of both eyes. be able to.
JP-A-63-7095 JP 2005-257901 A

  However, the stereoscopic display devices described in the above-mentioned Patent Documents 1 and 2 are configured to view the left 45-degree linearly polarized image light and the right 45-degree linearly polarized image light through a half mirror. When obliquely polarized light passes through a half mirror, the characteristic of linearly polarized light is lost, and thus there is a disadvantage that a good stereoscopic image cannot be obtained.

  In view of such a point, an object of the present invention is to obtain a favorable stereoscopic image.

  The stereoscopic display device of the present invention displays a half mirror with an upper end fixed in front of the upper part of the observation window and a lower end fixed at the lower part of the observation window, and one eye screen arranged behind the half mirror. And a second liquid crystal display device having the same polarization direction as that of the first liquid crystal display device for displaying the other eye screen disposed below the half mirror. In the stereoscopic display device in which the axis is perpendicular to the center of the screen of the first liquid crystal display device and the center of the screen of the second liquid crystal display device is overlapped with the visual axis by the half mirror, A half-wave plate is arranged on at least one of the screens of the first and second liquid crystal display devices, and one of the images obtained from the first and second liquid crystal display devices is obtained through the half mirror. The polarization direction of the image is horizontal, while the other The polarization direction of the image is obtained as the vertical direction.

  According to the present invention, a half-wave plate is disposed on at least one of the screens of the first and second liquid crystal display devices, and the image obtained from the first and second liquid crystal display devices is passed through the half mirror. Since the polarization direction of one of the obtained images is horizontal and the polarization direction of the other image is vertical, the polarization obtained through the half mirror is horizontal and vertical polarization, and the characteristics of linear polarization A good stereoscopic image can be obtained without breaking.

  Hereinafter, an example of the best mode for carrying out the stereoscopic display device of the present invention will be described with reference to FIGS. In FIG. 1 to FIG. 3, parts corresponding to those in FIG. 7 and FIG.

  FIG. 1 is a configuration diagram showing the stereoscopic display device of this example as a whole. In FIG. 1, reference numeral 10 denotes a square half mirror having the same transmittance and reflectance, and the upper end portion of the half mirror 10 is an observation window 11. The lower end of the half mirror 10 is fixed to the lower back of the observation window 11 so that the half mirror forms a 45-degree plane in the front direction with respect to the horizontal plane.

  A liquid crystal display device 40L in which the polarization direction for displaying the left-eye screen with the screen perpendicular to the horizontal plane is horizontal is fixed behind the half mirror 10 on the side opposite to the observation window 11 side. In this case, the upper side of the liquid crystal display device 40L corresponds to the upper side of the observation window 11, and the lower side of the liquid crystal display device 40L corresponds to the lower side of the observation window 11.

  A liquid crystal display device 40R having the same horizontal direction as the liquid crystal display device 40L is fixed to the lower side of the half mirror 10 to display a right-eye screen whose screen is horizontal with respect to the horizontal plane. In this case, the upper side of the screen of the liquid crystal display device 40R is positioned on the near side, and the lower side of the screen of the liquid crystal display device 40R is positioned on the back side. In this case, the liquid crystal display device 40L and the liquid crystal display device 40R are the same size.

  In this example, as shown in FIGS. 1 and 2, a ½ wavelength plate (½λ plate) 41 is attached to the image display surface of the liquid crystal display device 40R. In this case, since the half-wave plate 41 is very thin, in this example, the half-wave plate 41 attached to the vertical polarizing plate 42 is used. When the half-wave plate 41 is attached to the vertical polarizing plate 42, the polarization characteristics can be distorted.

  As shown in FIG. 4, the half-wave plate 41 gives a phase difference of π (= λ / 2) to the direction of electric field oscillation (polarization plane) of incident light. When incident at an azimuth angle of θ degrees with respect to the high-speed axis (or low-speed axis) of the two-wavelength plate 41, the vibration direction can be rotated (2 × θ degrees). Therefore, a rotation angle of 90 degrees is obtained when incident at an azimuth angle of 45 degrees. In this example, the incident light is incident at an azimuth angle of 45 degrees, and the polarized light in the vertical direction is obtained as the polarization direction.

  As an application of this half-wave plate, when circularly polarized light is incident at an azimuth angle of 45 degrees, the rotation direction of polarized light can be reversed.

  In this example, the visual axis 13 in the observation window 11 is set to be perpendicular to the center of the screen of the liquid crystal display device 40L that displays the screen for the left eye, and the screen of the liquid crystal display device 40R that displays the screen for the right eye. The center is overlapped with the visual axis 13 by the half mirror 10.

  The liquid crystal display devices 40L and 40R in this example are configured identically, and their structures are shown in FIG. Referring to FIG. 9, in FIG. 9, reference numerals 30a and 30b denote transparent glass substrates, and a color filter 31 is provided on the surface of the glass substrate 30a facing the glass substrate 30b.

  Transparent electrodes 32a and 32b such as ITO are provided on the color filter 31 and the surface of the glass substrate 30b facing the color filter 31, and alignment films 33a and 33b are provided on the transparent electrodes 32a and 32b. The liquid crystal material 34 is sealed between 33b. Reference numeral 35 denotes a sealing material.

  Further, polarizing plates 36a and 36b are provided on the surfaces of the glass substrates 30a and 30b that are not opposed to each other, a backlight 37 is provided on the side of the polarizing plate 36b that is not in contact with the glass substrate 30b, and light from the backlight 37 is liquid crystal. Switching is performed by the material 34.

  Next, video signals supplied to the liquid crystal display devices 40L and 40R of this example will be described with reference to FIG. In FIG. 3A, reference numeral 20 denotes a subject, and 21L and 21R denote left-eye and right-eye cameras such as a digital still camera and a video camera, which are installed at a left eye position and a right eye position, for example, 7 cm horizontally.

  The video signal captured by the left-eye camera 21L is supplied to the left-eye liquid crystal display device 40L via the video amplification circuit 22L, and the video signal captured by the right-eye camera 21R is connected in series to the scanning direction inversion circuit 23 and the video amplification circuit 22R. To the right-eye liquid crystal display device 40R.

  Further, as shown in FIG. 3B, video signals captured by the left-eye camera 21L and the right-eye camera 21R are recorded on recording media 24L and 24R such as a memory card and an optical disk, and the video signals recorded on the recording media 24L and 24R are recorded. The video signal reproduced from the recording medium 24L is supplied to the liquid crystal display device 40L for the left eye via the video amplification circuit 22L. The video signal reproduced from the recording medium 24R is supplied to the scanning direction inversion circuit 23 and the video amplification. The liquid crystal display device 40R for the right eye may be supplied via a series circuit of the circuit 22R.

  In FIG. 1, 43 is polarizing glasses worn by an observer, 43L and 43R are left-eye and right-eye polarizing plates, the left-eye polarizing plate 43L has a horizontal polarization angle, and the right-eye polarizing plate 43R is It has a vertical polarization angle.

  Next, the operation of this example will be described. The left-eye video signal from the left-eye camera 21L that images the subject 20 at the position of the left eye is supplied to the left-eye liquid crystal display device 12L, and the left-eye video signal is displayed on the left-eye liquid crystal display device 40L.

  On the other hand, the right-eye video signal from the right-eye camera 21R that has captured the subject 20 at the position of the right eye is supplied to the scanning direction inversion circuit 23, and the scanning direction inversion circuit 23 displays the video signal on the liquid crystal display device. Then, the left and right sides of the video are processed so as to be reversed, and this video signal is supplied to the right-eye liquid crystal display device 40R, and the right-eye liquid crystal display device 12R displays the video whose left and right sides are reversed.

  In this case, the image light from the left-eye liquid crystal display device 40L is linearly polarized light in the horizontal direction, passes through the half mirror 10 in the state of linearly polarized light in the horizontal direction, and is a half-wave plate from the right-eye liquid crystal display device 40R. The image light obtained through 41 and the vertical polarizing plate 42 is linearly polarized light in the vertical direction, and is linearly polarized light in the vertical direction even when reflected by the half mirror 10.

  Here, when the observer wears the left-eye and right-eye polarizing plates 43L and 43R and observes the observation window 11, the horizontal linearly polarized image light coming from the left-eye liquid crystal display device 40L is horizontally applied to the left eye. Direction left-eye polarizing plate 43L to reach the left eye. On the other hand, vertical linearly polarized video light coming from the right-eye liquid crystal display device 40R via the half-wave plate 41 and the vertical polarizing plate 42 passes through the right-right polarizing plate 43R applied to the right eye. By reaching the right eye, the observer can experience a stereoscopic effect with the parallax of both eyes.

  According to this example, the half-wave plate 41 is arranged on the screen of the right-eye liquid crystal display device 40R, and the images obtained from the left-eye and right-eye liquid crystal display devices 40L and 40R are passed through the half mirror 10. Since the polarization direction of the obtained image of the left-eye liquid crystal display device 40L is horizontal and the polarization direction of the image of the right-eye liquid crystal display device 40R is vertical, the polarization obtained through the half mirror 10 is It is horizontal and vertical polarized light, and a good stereoscopic image can be obtained without losing the characteristics of linearly polarized light.

  Further, according to this example, the visual axis 13 is made to coincide with the centers of the screens of the left-eye and right-eye liquid crystal display devices 40L and 40R.

  FIG. 5 shows another example of the best mode for carrying out the present invention. 5 will be described. In FIG. 5, parts corresponding to those in FIG.

  In the example of FIG. 5, the left-eye and right-eye liquid crystal display devices 40L and 40R in the example of FIG. 1 are configured by a liquid crystal display device having a polarization direction of 45 degrees to the left as in FIG. 7, and the left-eye liquid crystal display device 40L has a display screen. A half-wave plate 41L attached to the horizontal polarizing plate 42L is attached, and a half-wave plate 41R attached to the vertical polarizing plate 42R is attached to the display screen of the right-eye liquid crystal display device 40R. To do.

  In this example, the half-wave plate 41L attached to the left-eye liquid crystal display device 40L is made to have a horizontal polarization direction, and the half-wave plate 41R attached to the right-eye liquid crystal display device 40R. To make the polarization direction vertical. In this case, the polarization direction of the image of the left-eye liquid crystal display device 40L obtained through the half mirror 10 of the image obtained from the left-eye and right-eye liquid crystal display devices 40L and 40R is the horizontal direction, and the right-eye liquid crystal display device 40R The polarization direction of the image is the vertical direction.

  The example in FIG. 5 is configured in the same manner as in FIG. It can be easily understood that the same operational effects as in FIG. 1 can be obtained in this FIG. 5 example.

  In the above-described example, the backlight 37 of one of the left-eye or right-eye liquid crystal display devices 40L or 40R, for example, the right-eye liquid crystal display device 40R, is the opposite side, for example, in the liquid crystal display device of the example of FIG. When the backlight 37 is provided on the side opposite to the glass substrate 30a side of the polarizing plate 36a, the scanning direction is reversed, so there is an advantage that the scanning direction reversing circuit 23 is not necessary.

  Of course, the present invention is not limited to the above-described examples, and various other configurations can be adopted without departing from the gist of the present invention.

It is a block diagram which shows the example of the best form for implementing this invention three-dimensional display apparatus. It is a side view which shows the example of the principal part of this invention. It is a block diagram which shows the example which obtains the video signal supplied to a liquid crystal display device. It is a diagram with which it uses for description of a half-wave plate. It is a block diagram which shows the other example of the best form for implementing this invention. It is a block diagram which shows the example of the conventional stereoscopic display apparatus. It is a block diagram which shows the example of the conventional stereoscopic display apparatus. It is a block diagram which shows the example which obtains the video signal supplied to a liquid crystal display device. It is sectional drawing which shows the example of a liquid crystal display device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Half mirror, 11 ... Observation window, 13 ... Visual axis, 40L, 40R ... Liquid crystal display device, 41, 41L, 41R ... Half wave plate, 42, 42R ... Vertical polarizing plate, 42L ... Horizontal direction Polarizing plate, 43 ... Polarized glasses

Claims (3)

A first liquid crystal display device that displays a half mirror having an upper end fixed in front of the upper part of the observation window and a lower end fixed to the lower part of the observation window, and one eye screen arranged behind the half mirror. And a second liquid crystal display device having the same polarization direction as the first liquid crystal display device displaying the other eye screen disposed below the half mirror, and the visual axis is the first liquid crystal In the stereoscopic display device in which the center of the screen of the second liquid crystal display device is overlapped with the visual axis and the half mirror so as to be perpendicular to the center of the screen of the display device,
A half-wave plate is disposed on at least one of the screens of the first and second liquid crystal display devices, and one of the images obtained from the first and second liquid crystal display devices is obtained through the half mirror. A stereoscopic display device characterized in that the polarization direction of an image is horizontal and the polarization direction of the other image is vertical. The stereoscopic display device according to claim 1,
A stereoscopic display device, wherein the same liquid crystal display device is used as the first and second liquid crystal display devices, and the scanning direction of a video signal supplied to one of the liquid crystal display devices is reversed. The stereoscopic display device according to claim 1,
A three-dimensional display device using the same liquid crystal display device as the first and second liquid crystal display devices and providing a backlight of one liquid crystal display device on the opposite side.

Images