WO2007043153A1 - Liquid crystal image display - Google Patents

Liquid crystal image display Download PDF

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Publication number
WO2007043153A1
WO2007043153A1 PCT/JP2005/018561 JP2005018561W WO2007043153A1 WO 2007043153 A1 WO2007043153 A1 WO 2007043153A1 JP 2005018561 W JP2005018561 W JP 2005018561W WO 2007043153 A1 WO2007043153 A1 WO 2007043153A1
Authority
WO
WIPO (PCT)
Prior art keywords
liquid crystal
polarizing plate
eye
image display
display device
Prior art date
Application number
PCT/JP2005/018561
Other languages
French (fr)
Japanese (ja)
Other versions
WO2007043153A9 (en
Inventor
Shinya Fukuta
Toshiaki Yoshihara
Shinji Tadaki
Hironori Shiroto
Tetsuya Makino
Original Assignee
Fujitsu Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Limited filed Critical Fujitsu Limited
Priority to PCT/JP2005/018561 priority Critical patent/WO2007043153A1/en
Priority to JP2007539774A priority patent/JPWO2007043153A1/en
Publication of WO2007043153A1 publication Critical patent/WO2007043153A1/en
Publication of WO2007043153A9 publication Critical patent/WO2007043153A9/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
    • H04N13/337—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using polarisation multiplexing
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
    • G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
    • G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
    • G02B30/25—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type using polarisation techniques
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/361—Reproducing mixed stereoscopic images; Reproducing mixed monoscopic and stereoscopic images, e.g. a stereoscopic image overlay window on a monoscopic image background
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/398—Synchronisation thereof; Control thereof

Definitions

  • the present invention relates to a liquid crystal image display device, and in particular, a liquid that presents a right-eye image and a left-eye image to an observer and displays a stereoscopic image by visually recognizing different images with the left and right eyes of the observer.
  • a crystal image display device and a single device in addition to normal image display, a secret image display that displays a secret image that only a specific observer can see, and a stereoscopic image that displays a three-dimensional stereoscopic image.
  • the present invention relates to a liquid crystal image display device capable of realizing image display.
  • the stereoscopic image display principle is that the left and right eyes of the observer are isolated from each other and the right and left eye images having parallax are presented to the observer's left and right eyes, respectively. 3D images are visually recognized.
  • the observer wears observation glasses (polarized glasses) with polarizing plates having different polarization directions on the left and right.
  • observation glasses polarized glasses
  • a technique is known, and a stereoscopic image is visually recognized by entering only an image having a polarization direction corresponding to the left and right glasses (see, for example, Patent Documents 1 and 2).
  • Patent Document 1 JP-A-2-122790
  • Patent Document 2 JP-A-4-353818
  • the stereoscopic image display device described in Patent Document 1 uses a single liquid crystal panel to alternately display right-eye images and left-eye images, and displays stereoscopic images via polarized glasses. This is a configuration for visual recognition. Therefore, since the right-eye image and the left-eye image are alternately output for each frame, there is a problem that a flicker force is easily generated and a burden is placed on the eyes.
  • the stereoscopic image display device described in Patent Document 2 is provided with two liquid crystal panels for displaying images having a difference between the left and right eyes, respectively.
  • the transmitted light is synthesized by a noise mirror or polarization beam splitter, and the synthesized light is synthesized.
  • the stereoscopic image is visually recognized through the polarizing glasses.
  • an optical member such as a half mirror is necessary and the entire apparatus becomes large!
  • a liquid crystal image display device having a secret image display function that allows only a specific observer to see an image has been proposed (for example, Japanese Patent No. 3293167).
  • the concealed image is made visible only to the observer wearing the polarizing plate by observing the polarizing component in the vertical direction and the polarizing component in the horizontal direction through the polarizing plate.
  • a liquid crystal image display device capable of performing both such a secret image display function and the above-described stereoscopic image display function has been proposed.
  • the present invention has been made in view of such circumstances, and provides a liquid crystal image display device that allows a viewer to visually recognize a stereoscopic image with a small configuration that does not generate flickering force. For the purpose.
  • Another object of the present invention is to provide a liquid crystal image display device capable of realizing a secret image display and a stereoscopic image display with a single device in addition to the normal image display.
  • the liquid crystal image display device is a liquid crystal image display device that displays a right-eye image and a left-eye image to display a stereoscopic image.
  • the first polarizing plate, the first liquid crystal panel, A display device body in which two polarizing plates and a second liquid crystal panel are laminated in this order, and a right-eye polarizing plate and a left-eye polarizing plate disposed to face the second liquid crystal panel of the display device body A board, means for controlling the transmitted light intensity in the first liquid crystal panel based on the magnitudes of the right-eye image signal and the left-eye image signal, and the right-eye image signal and the left-eye image signal. And a means for controlling the twist angle of the transmitted light in the second liquid crystal panel based on the size.
  • the voltage applied to the liquid crystal of the first liquid crystal panel is adjusted in units of each pixel based on the magnitudes of the right eye image signal and the left eye image signal.
  • the light transmission intensity at each pixel is controlled, and the voltage applied to the liquid crystal of the second liquid crystal panel is adjusted for each pixel based on the size of the image signal for the right eye and the image signal for the left eye!
  • To control the rotation angle of the liquid crystal at each pixel, and the light emitted from the second liquid crystal panel Observation is performed via a polarizing plate for the right eye and a polarizing plate for the left eye that have different directions. Therefore, patent literature
  • the display device body has a first 1Z4 wavelength plate laminated on the second liquid crystal panel, and the first 1Z4 wavelength plate includes A second 1Z4 wavelength plate is superimposed on the right-eye polarizing plate and the left-eye polarizing plate so as to face each other.
  • the light emitted from the second liquid crystal panel is converted into circularly polarized light by the first 1Z4 wavelength plate, and the circularly polarized light is converted into the second 1Z4 wavelength.
  • the image is observed through the right-eye polarizing plate and the left-eye polarizing plate.
  • the output light of the display device main body is circularly polarized, and the image cannot be discerned by the naked eye as well as through a simple polarizing plate. Therefore, it is possible to prevent images from being read by glasses for general use such as OA glasses and sunglasses that block the incidence of reflected light.
  • the liquid crystal image display device is characterized by comprising means for rotating at least one of the polarizing plate for the right eye and the polarizing plate for the left eye by 90 ° or more.
  • the right-eye polarizing plate and the Z or left-eye polarizing plate are rotated so that the polarization directions of both polarizing plates coincide with each other.
  • the mirror can be used as the hidden image display glasses, and in addition to the normal image display, both the hidden image display and the stereoscopic image display can be realized with one apparatus.
  • a liquid crystal image display device includes a display device body in which a first polarizing plate, a first liquid crystal panel, a second polarizing plate, and a second liquid crystal panel are laminated in this order, and the display
  • the liquid crystal image display device includes means for rotating a part of the third polarizing plate by 90 ° or more. It is characterized by.
  • the confidential image display glasses can be used as stereoscopic image display glasses, and a normal image can be obtained with one device.
  • both the secret image display and the stereoscopic image display can be realized.
  • the display device body has a first 1Z4 wavelength plate laminated on the second liquid crystal panel, and the first 1Z4 wavelength plate includes the first 1Z4 wavelength plate.
  • a second 1Z4 wavelength plate is overlapped with the third polarizing plate so as to face each other.
  • the light emitted from the second liquid crystal panel is converted into circularly polarized light by the first 1Z4 wavelength plate, and the circularly polarized light is converted into the second 1Z4 wavelength.
  • the image is observed through the third polarizing plate.
  • the light emitted from the display device main body is circularly polarized, and an image cannot be discriminated by the naked eye as well as through a simple polarizing plate. Therefore, it prevents the image from being read by glasses for general use such as OA glasses and sunglasses that block the incidence of reflected light.
  • the light transmission intensity in each pixel is controlled by the first liquid crystal panel, and the rotation angle of the liquid crystal in each pixel is controlled by the second liquid crystal panel.
  • a stereoscopic image that does not generate flickering force can be displayed.
  • a pair of glasses for stereoscopic image display and a pair of glasses for secret image display can be used with a single pair of glasses, and three types of normal image display, secret image display, and three-dimensional image display can be performed with a single device.
  • the display mode can be realized.
  • the polarizing plate Since the circularly polarized light is converted back to linearly polarized light by the second 1Z4 wavelength plate of the glasses, the polarizing plate is simply attached, and the glasses cannot be discriminated to improve the concealment function. wear.
  • FIG. 1 is a schematic diagram showing a configuration of a liquid crystal image display device according to a first embodiment.
  • FIG. 2 is a diagram showing a schematic configuration of a liquid crystal image display device in a normal image display mode.
  • FIG. 3 is a diagram showing a schematic configuration of a liquid crystal image display device in a secret image display mode.
  • FIG. 4 is a diagram showing a schematic configuration of a liquid crystal image display device in a stereoscopic image display mode.
  • FIG. 5 is a schematic diagram showing a control range in a stereoscopic image display mode.
  • FIG. 6 is a schematic diagram showing a configuration of a liquid crystal image display device according to a second embodiment.
  • FIG. 7 is a schematic diagram showing a configuration of a liquid crystal image display device according to a third embodiment.
  • FIG. 1 is a schematic diagram showing the configuration of the liquid crystal image display device according to the first embodiment.
  • the liquid crystal image display device includes a display device body 1 and observation glasses 10.
  • the display device body 1 includes, from the back side, the first polarizing plate 2, the first liquid crystal panel 3, and the second polarized light.
  • the plate 4, the second liquid crystal panel 5, and the first 1Z4 wavelength plate 6 are laminated in this order, and a knock light 7 serving as a light source is provided on the back side of the first polarizing plate 2. It has been. That is, the display device body 1 has two types of liquid crystal panels, a first liquid crystal panel 3 and a second liquid crystal panel 5, and the first liquid crystal panel 3 has the polarization directions orthogonal to each other. Disposed between the first polarizing plate 2 and the second polarizing plate 4.
  • the second liquid crystal panel 5 in which the first 1Z4 wave plate 6 is attached to the front is disposed on the back side of the second polarizing plate 4. Note that although the polarization directions of the first polarizing plate 2 and the second polarizing plate 4 are arbitrary, here, a general parallel Nicol configuration is considered.
  • Both the first liquid crystal panel 3 and the second liquid crystal panel 5 are formed inside the glass plate by sealing liquid crystal molecules in the gaps between the glass plates opposed to each other with a predetermined interval.
  • the plurality of transparent electrodes are configured to be orthogonal to each other.
  • the polarization direction of the liquid crystal molecules is arbitrary, but here the state where the polarization is rotated by 90 ° is set to the initial state.
  • the polarization direction of the second polarizing plate 4 is the same as the dextrorotatory axis or the levorotatory axis of the first 1Z4 wavelength plate 6.
  • the polarization direction of the second polarizing plate 4 coincides with the dextrorotatory axis of the first 1Z4 wave plate 6 and is parallel. To do.
  • the observation glasses 10 have a configuration in which a second 1Z4 wavelength plate 11, a right-eye polarizing plate 12, and a left-eye polarizing plate 13 are laminated from the display device body 1 side. It can be attached to the observer.
  • the polarization directions of the right-eye polarizing plate 12 and the left-eye polarizing plate 13 are orthogonal to each other, and the polarization direction of the right-eye polarizing plate 12 is equal to the polarization direction of the second polarizing plate 4 for the left eye.
  • the polarization direction of the polarizing plate 13 is equal to the polarization direction of the first polarizing plate 2.
  • a rotation mechanism 14 is connected to the right-eye polarizing plate 12 so that the right-eye polarizing plate 12 can be rotated by 90 ° or more and its polarization direction can be changed.
  • liquid crystal image display device having such a configuration
  • normal image display, secret image display, and stereoscopic image display can be realized with this single device.
  • each display mode will be described in detail.
  • FIG. 2 is a diagram showing a schematic configuration of the liquid crystal image display device in the normal image display mode.
  • the eyeglasses for observation 10 are not used, and the observer looks directly at the display device body 1.
  • 21 is an image memory for storing an image signal for a normal image input from the outside. Pixel data is sequentially output from the image memory 21 to the panel driver 22.
  • the panel driver 22 controls the voltage applied to the transparent electrode of the first liquid crystal panel 3 so that the light transmittance corresponding to the pixel data is obtained for each pixel. During normal image display, no voltage is applied to all the transparent electrodes of the second liquid crystal panel 5.
  • the pixels in the liquid crystal panel are two-dimensionally arranged, when the pixel position is represented by i rows and j columns, the gradation of the pixel is represented by p (t).
  • the gradation of each pixel is a function of time, and the panel driver 22 can perform gradation control.
  • the electric field vector T (t) of the pixel in i row and j column exiting the second polarizing plate 4 is expressed by the following equation.
  • E is the electric field intensity after passing through the second polarizing plate 4, ideally uniform over the entire screen area
  • e is the unit direction of the right-handed axis of the first 1Z4 wave plate 6 vector
  • the gradation p (t) becomes p (t) c sin ⁇ (t).
  • ⁇ (t) is considered to be proportional to the voltage V (t) applied to the liquid crystal of each pixel. Since p (t) c sin ⁇ «V (t) ⁇ , it is possible to adjust the gradation of each pixel by controlling the applied voltage for each pixel.
  • FIG. 3 is a diagram showing a schematic configuration of the liquid crystal image display device in the secret image display mode.
  • the right-eye polarizing plate 12 of the observation glasses 10 is rotated by the rotation mechanism 14, and the polarization direction of the right-eye polarizing plate 12 is changed to the polarization of the left-eye polarizing plate 13 and the first polarizing plate 2. Match the direction.
  • 31 is an image memory for storing an image signal for a secret image input from the outside. Pixel data is sequentially output from the image memory 31 to the panel driver 32.
  • the panel driver 32 controls the voltage applied to the transparent electrode of the second liquid crystal panel 5 so that the light transmittance corresponding to the pixel data is obtained for each pixel.
  • the secret image is displayed, no voltage is applied to all the transparent electrodes of the first liquid crystal panel 3.
  • the second liquid crystal panel 5 displays an image (a secret image) that is composed of a polarization component rotated 90 ° and a polarization component that does not rotate 90 °, which cannot be discriminated with the naked eye.
  • the polarized light component transmitted through the second liquid crystal panel 5 is converted into circularly polarized light having different rotation directions by the first 1Z4 wave plate 6, and an image that cannot be discerned by the naked eye or through a simple polarizing plate. It is formed.
  • the circularly polarized light is the original polarization component.
  • the polarization component can be discriminated. Therefore, the observer wearing the observation eyeglass 10 can wear the observation eyeglasses 10 and can visually recognize the secret image that cannot be seen by other people.
  • IT (t) I is the magnitude of the electric field vector T (t), and e is the left of the first quarter-wave plate 6 This is the unit direction vector of the pivot axis.
  • the light passing through the first 1Z4 wavelength plate 6 becomes dextrorotatory circularly polarized light and levorotatory circularly polarized light, and dextrorotatory circularly polarized light and levorotatory circularly polarized light at the pixel in i row and j column.
  • the intensity ratio with light is cos 2 ⁇ (t)
  • the first liquid crystal panel 3 has a force to display only the secret image without applying a voltage to the first liquid crystal panel 3.
  • a secret image may be displayed by applying a voltage for displaying an image and superimposing it on a normal image that can be viewed by anyone.
  • FIG. 4 is a diagram showing a schematic configuration of the liquid crystal image display device in the stereoscopic image display mode.
  • the right-eye polarizing plate 12 is not rotated.
  • reference numeral 41 denotes an image memory for storing a right eye image signal and a left eye image signal to which an external force is also input. From the image memory 41, the pixel data of the right-eye image (pixel level a
  • the intensity calculator 42 calculates the composite level (specifically (a 2 + b 2 ) 1/2 ) of both pixel data, and outputs the calculation result to the first panel driver 44.
  • the first panel driver 44 controls the voltage applied to the transparent electrode of the first liquid crystal panel 3 so that the transmitted light intensity (light transmittance) corresponding to the calculation result is obtained for each pixel.
  • the rotation angle calculator 43 calculates a parameter value (specifically, tan (bZa)) representing the level ratio of both pixel data, and outputs the calculation result to the second panel driver 45.
  • the second panel driver 45 controls the voltage applied to the transparent electrode of the second liquid crystal panel 5 so that the rotation angle of the liquid crystal (the twist angle of transmitted light) corresponding to the calculation result can be obtained in units of pixels. .
  • An observer wears eyeglasses 10 for observation having a second 1Z4 wavelength plate 11, a polarizing plate 12 for the right eye, and a polarizing plate 13 for the left eye, and looks toward the display device body 1. Turn. At this time, the right-eye polarizing plate 12 is not rotated, and the polarization direction of the right-eye polarizing plate 12 of the observation glasses 10 and the polarization direction of the left-eye polarizing plate 13 are orthogonal to each other.
  • circular polarization is controlled by the second liquid crystal panel 5 and the first 1Z4 wavelength plate 6. Then, the observer views the light from the display device body 1 (first 1Z4 wavelength plate 6) through the second 1Z4 wavelength plate 11, the right-eye polarizing plate 12, and the left-eye polarizing plate 13. Since the image of circular polarization control performed on the second liquid crystal panel 5 can be controlled independently on the left and right, a stereoscopic image can be displayed.
  • ⁇ (t) and ⁇ (t) a and b can be controlled independently.
  • Fig. 5 is a schematic diagram showing this control range. Since the length of one side of the square of the maximum range that can be controlled independently within a circle with a radius of 1 is 2, we understand the size of this maximum value c. it can.
  • the light from the first 1Z4 wavelength plate 6 is attached to the observation glasses 10 having the second 1Z4 wavelength plate 11, the right-eye polarizing plate 12, and the left-eye polarizing plate 13.
  • the circularly polarized light is converted back to linearly polarized light by the second 1Z4 wavelength plate 11
  • the right-handed and left-handed light from the second 1Z4 wavelength plate 11 is mixed into the right-eye polarizing plate.
  • An arbitrary set (a, b) (where a ⁇ 0, b ⁇ 0) can be expressed as follows based on the expression of the electric field vector E (t) described above.
  • ⁇ (t) arc sin ⁇ a / cos ⁇ (t) ⁇
  • FIG. 6 is a schematic diagram showing the configuration of the liquid crystal image display device according to the second embodiment.
  • the same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.
  • the second embodiment is an example in which the configuration is simplified as compared with the first embodiment.
  • the display device main body 51 of the second embodiment includes a first polarizing plate 2 and a first liquid crystal panel from the back side. 3, the second polarizing plate 4 and the second liquid crystal panel 5 are stacked in this order, and the back side of the first polarizing plate 2 is provided with a backlight 7 as a light source,
  • the first 1Z4 wavelength plate 6 is removed from the display device body 1 of the first embodiment.
  • the observation glasses 60 of the second embodiment include the right-eye polarizing plate 12 and the left-eye polarization plate 13 whose polarization directions are orthogonal to each other, and the observation glasses 10 of the first embodiment. In this configuration, the second 1Z4 wavelength plate 11 is removed.
  • the two 1Z4 wavelength plates in the first embodiment are provided to enhance the confidentiality of the display image, and are essential for any of normal image display, confidential image display, and stereoscopic image display. It is not an optical member. Therefore, in the second embodiment, these 1Z4 wave plates are not provided, and normal image display, secret image display, and stereoscopic image display can be realized by a liquid crystal image display device having a simple configuration. The second embodiment can be reduced in size and cost as compared with the first embodiment.
  • the right-eye polarizing plate 12 is configured to be rotatable.
  • the left-eye polarizing plate 13 is configured to be rotatable. It is also possible to make both polarizing plates rotatable.
  • FIG. 7 is a schematic diagram showing the configuration of the liquid crystal image display device according to the third embodiment.
  • the same parts as those in FIGS. 1 and 6 are denoted by the same reference numerals, and detailed description thereof is omitted.
  • the configuration of the image device main body 1 of the third embodiment is the same as that of the first embodiment.
  • the observation spectacles 70 of the third embodiment have a configuration in which a second 1Z4 wavelength plate 11 and a third polarizing plate 72 are laminated from the display device body 1 side. It can be installed.
  • the polarization direction of the third polarizing plate 72 is equal to the polarization direction of the first polarizing plate 2.
  • a rotation mechanism 74 is connected to the third polarizing plate 72, and a part of the third polarizing plate 72 can be rotated by 90 ° or more to change the polarization direction.
  • the rotation mechanism 74 rotates a part of the third polarizing plate 72 by 90 ° so that the polarization direction of the partial region coincides with the polarization direction of the second polarizing plate 4. Then, a partial region of the rotated third polarizing plate 72 is used as a right-eye polarizing plate, and the remaining region of the third polarizing plate 72 is used as a left-eye polarizing plate without being rotated.
  • the rotation mechanism 74 rotates a part of the third polarizing plate 72 by 90 ° so that the polarization direction of the partial region coincides with the polarization direction of the second polarizing plate 4.
  • a partial region of the rotated third polarizing plate 72 is used as a right-eye polarizing plate
  • the remaining region of the third polarizing plate 72 is used as a left-eye polarizing plate without being rotated.
  • normal image display, secret image display, and stereoscopic image display can be realized by a single device without changing the configuration of the device.
  • first 1Z4 wavelength plate 6 and the second 1Z4 wavelength plate 11 are provided, it is not possible to view an image only by using only a polarizing plate for observation glasses, and a high degree of secrecy is achieved. Obtainable.
  • the first 1Z4 wavelength plate 6 and the second 1Z4 wavelength plate 11 are not essential optical members for realizing three types of display modes. For this reason, as a matter of course, it is possible to remove these 1Z4 wavelength plates to form a simple configuration as in the second embodiment, so as to reduce the size and cost.

Abstract

A display body (1) comprises a first polarizing plate (2), a first liquid crystal panel, (3), a second polarizing plate (4), a second liquid crystal panel (5), and a first quarter wavelength plate (6) all formed sequentially in order of mention from the back of the display body (1). Viewer eyeglasses (10) worn by a viewer comprises a second quarter wavelength plate (11), a right-eye polarizing plate (12), and a left-eye polarizing plate (13) all formed sequentially in order of mention from the side of the display body (1). The direction of polarization of the right-eye polarizing plate (12) is perpendicular to that of the left-eye polarizing plate (13). The right-eye polarizing plate (12) is rotatable by a rotating mechanism (14). With such a single device constitution, normal image display, secret image display, and stereoscopic image display are realized.

Description

明 細 書  Specification
液晶画像表示装置  Liquid crystal image display device
技術分野  Technical field
[0001] 本発明は、液晶画像表示装置に関し、特に、右眼用画像及び左眼用画像を観察 者に呈示し、観察者の左右の眼で異なる画像を視認させて立体画像を表示する液 晶画像表示装置、及び、一つの装置で、通常画像表示に加えて、特定の観察者の みが見ることができる秘匿画像を表示する秘匿画像表示と、三次元の立体画像を表 示する立体画像表示とを実現できる液晶画像表示装置に関する。  TECHNICAL FIELD [0001] The present invention relates to a liquid crystal image display device, and in particular, a liquid that presents a right-eye image and a left-eye image to an observer and displays a stereoscopic image by visually recognizing different images with the left and right eyes of the observer. A crystal image display device and a single device, in addition to normal image display, a secret image display that displays a secret image that only a specific observer can see, and a stereoscopic image that displays a three-dimensional stereoscopic image. The present invention relates to a liquid crystal image display device capable of realizing image display.
背景技術  Background art
[0002] 立体画像の表示原理は、観察者の左右の眼の視野を隔離し、観察者の左右の眼 それぞれに視差を有する右眼用画像及び左眼用画像を呈示することにより、観察者 に立体画像を視認させるものである。立体画像を得るために右眼用画像と左眼用画 像とを分離する方法としては、左右で異なる偏光方向を有する偏光板を装着した観 察用眼鏡 (偏光眼鏡)を観察者に装着させる手法が知られており、左右の眼鏡に対 応する偏光方向を有する画像のみをそれぞれ入射することにより、立体画像を視認 させる（例えば、特許文献 1, 2参照)。  [0002] The stereoscopic image display principle is that the left and right eyes of the observer are isolated from each other and the right and left eye images having parallax are presented to the observer's left and right eyes, respectively. 3D images are visually recognized. To obtain a right-eye image and a left-eye image in order to obtain a stereoscopic image, the observer wears observation glasses (polarized glasses) with polarizing plates having different polarization directions on the left and right. A technique is known, and a stereoscopic image is visually recognized by entering only an image having a polarization direction corresponding to the left and right glasses (see, for example, Patent Documents 1 and 2).
特許文献 1 :特開平 2— 122790号公報  Patent Document 1: JP-A-2-122790
特許文献 2 :特開平 4— 353818号公報  Patent Document 2: JP-A-4-353818
発明の開示  Disclosure of the invention
発明が解決しょうとする課題  Problems to be solved by the invention
[0003] 特許文献 1に記載されている立体画像表示装置では、一つの液晶パネルを使用し て、右眼用画像と左眼用画像とを交互に表示し、偏光眼鏡を介して立体画像を視認 させる構成である。よって、フレーム毎に右眼用画像と左眼用画像とを交互に出力す るため、フリツ力が発生し易ぐ目に負担をかけるという問題がある。  [0003] The stereoscopic image display device described in Patent Document 1 uses a single liquid crystal panel to alternately display right-eye images and left-eye images, and displays stereoscopic images via polarized glasses. This is a configuration for visual recognition. Therefore, since the right-eye image and the left-eye image are alternately output for each frame, there is a problem that a flicker force is easily generated and a burden is placed on the eyes.
[0004] 一方、特許文献 2に記載されて 、る立体画像表示装置では、左右の眼のための視 差を有する画像をそれぞれ表示するための二つの液晶パネルを設けて、両液晶パ ネルの透過光をノヽーフミラーまたは偏光ビームスプリッタにて合成し、その合成光を 偏光眼鏡を介して観察させて立体画像を視認させる構成である。し力しながらこの構 成では、ハーフミラーなどの光学部材が必要であって装置全体が大型化すると!、う 問題がある。 On the other hand, the stereoscopic image display device described in Patent Document 2 is provided with two liquid crystal panels for displaying images having a difference between the left and right eyes, respectively. The transmitted light is synthesized by a noise mirror or polarization beam splitter, and the synthesized light is synthesized. In this configuration, the stereoscopic image is visually recognized through the polarizing glasses. However, in this configuration, there is a problem that an optical member such as a half mirror is necessary and the entire apparatus becomes large!
[0005] ところで、特定の観察者のみが画像を見ることができる秘匿画像表示機能を備えた 液晶画像表示装置が提案されている (例えば、特許第 3293167号公報)。この装置 では、垂直方向の偏光成分と水平方向の偏光成分とを、偏光板を介して観察させる ことにより、偏光板を装着した観察者にのみ秘匿画像を視認させている。しかしなが ら、このような秘匿画像表示機能と、上述したような立体画像表示機能とを併せて果 たせる液晶画像表示装置は提案されて ヽな ヽ。  Incidentally, a liquid crystal image display device having a secret image display function that allows only a specific observer to see an image has been proposed (for example, Japanese Patent No. 3293167). In this apparatus, the concealed image is made visible only to the observer wearing the polarizing plate by observing the polarizing component in the vertical direction and the polarizing component in the horizontal direction through the polarizing plate. However, a liquid crystal image display device capable of performing both such a secret image display function and the above-described stereoscopic image display function has been proposed.
[0006] 本発明は斯力る事情に鑑みてなされたものであり、フリツ力が発生することなぐ小 型の構成で、立体画像を観察者に視認させることができる液晶画像表示装置を提供 することを目的とする。  [0006] The present invention has been made in view of such circumstances, and provides a liquid crystal image display device that allows a viewer to visually recognize a stereoscopic image with a small configuration that does not generate flickering force. For the purpose.
[0007] 本発明の他の目的は、通常画像表示に加えて、秘匿画像表示と立体画像表示とを 、一つの装置で実現できる液晶画像表示装置を提供することにある。  [0007] Another object of the present invention is to provide a liquid crystal image display device capable of realizing a secret image display and a stereoscopic image display with a single device in addition to the normal image display.
課題を解決するための手段  Means for solving the problem
[0008] 本発明に係る液晶画像表示装置は、右眼用画像及び左眼用画像を呈示して立体 画像を表示する液晶画像表示装置において、第 1の偏光板、第 1の液晶パネル、第 2の偏光板及び第 2の液晶パネルをこの順に積層してなる表示装置本体と、該表示 装置本体の前記第 2の液晶パネルに対向して配置される右眼用偏光板及び左眼用 偏光板と、右眼用画像信号及び左眼用画像信号の大きさに基づいて前記第 1の液 晶パネルでの透過光強度を制御する手段と、右眼用画像信号及び左眼用画像信号 の大きさに基づいて前記第 2の液晶パネルでの透過光のねじれ角を制御する手段と を備えることを特徴とする。 The liquid crystal image display device according to the present invention is a liquid crystal image display device that displays a right-eye image and a left-eye image to display a stereoscopic image. The first polarizing plate, the first liquid crystal panel, A display device body in which two polarizing plates and a second liquid crystal panel are laminated in this order, and a right-eye polarizing plate and a left-eye polarizing plate disposed to face the second liquid crystal panel of the display device body A board, means for controlling the transmitted light intensity in the first liquid crystal panel based on the magnitudes of the right-eye image signal and the left-eye image signal, and the right-eye image signal and the left-eye image signal. And a means for controlling the twist angle of the transmitted light in the second liquid crystal panel based on the size.
[0009] 本発明の液晶画像表示装置にあっては、右眼用画像信号及び左眼用画像信号の 大きさに基づいて第 1の液晶パネルの液晶に印加する電圧を各画素単位で調整し て各画素における光透過強度を制御し、右眼用画像信号及び左眼用画像信号の大 きさに基づ!/、て第 2の液晶パネルの液晶に印加する電圧を各画素単位で調整して 各画素における液晶の回転角を制御し、第 2の液晶パネルからの出射光を、偏光方 向が異なる右眼用偏光板及び左眼用偏光板を介して観察させる。よって、特許文献In the liquid crystal image display device of the present invention, the voltage applied to the liquid crystal of the first liquid crystal panel is adjusted in units of each pixel based on the magnitudes of the right eye image signal and the left eye image signal. The light transmission intensity at each pixel is controlled, and the voltage applied to the liquid crystal of the second liquid crystal panel is adjusted for each pixel based on the size of the image signal for the right eye and the image signal for the left eye! To control the rotation angle of the liquid crystal at each pixel, and the light emitted from the second liquid crystal panel Observation is performed via a polarizing plate for the right eye and a polarizing plate for the left eye that have different directions. Therefore, patent literature
1とは異なり、右眼用画像と左眼用画像とを同時に呈示するため、フリツ力は発生せ ず、目に優しい。また、特許文献 2のように合成のための特別な光学部材は不要とな り、小型の構成となる。 Unlike 1, the image for the right eye and the image for the left eye are presented simultaneously, so there is no flickering force and it is gentle on the eyes. In addition, a special optical member for synthesis as in Patent Document 2 is not required, and the configuration is small.
[0010] 本発明に係る液晶画像表示装置は、前記表示装置本体が、前記第 2の液晶パネ ルに積層される第 1の 1Z4波長板を有しており、該第 1の 1Z4波長板に対向させて 前記右眼用偏光板及び左眼用偏光板に第 2の 1Z4波長板を重着してあることを特 徴とする。  [0010] In the liquid crystal image display device according to the present invention, the display device body has a first 1Z4 wavelength plate laminated on the second liquid crystal panel, and the first 1Z4 wavelength plate includes A second 1Z4 wavelength plate is superimposed on the right-eye polarizing plate and the left-eye polarizing plate so as to face each other.
[0011] 本発明の液晶画像表示装置にあっては、第 2の液晶パネルから出射された光は第 1の 1Z4波長板で円偏光光に変換され、その円偏光光は第 2の 1Z4波長板でもと に戻り、右眼用偏光板及び左眼用偏光板を介して画像が観察される。表示装置本体 力 の出射光は円偏光が施されており、肉眼ではもとより単なる偏光板を介しても画 像を判別できない。よって、反射光の入射を遮断する OA眼鏡、サングラスなどの一 般的な用途の眼鏡で画像が読み取られることを防止する。  In the liquid crystal image display device of the present invention, the light emitted from the second liquid crystal panel is converted into circularly polarized light by the first 1Z4 wavelength plate, and the circularly polarized light is converted into the second 1Z4 wavelength. Returning to the plate, the image is observed through the right-eye polarizing plate and the left-eye polarizing plate. The output light of the display device main body is circularly polarized, and the image cannot be discerned by the naked eye as well as through a simple polarizing plate. Therefore, it is possible to prevent images from being read by glasses for general use such as OA glasses and sunglasses that block the incidence of reflected light.
[0012] 本発明に係る液晶画像表示装置は、前記右眼用偏光板及び左眼用偏光板の少な くとも一方を 90° 以上回転させる手段を備えることを特徴とする。  The liquid crystal image display device according to the present invention is characterized by comprising means for rotating at least one of the polarizing plate for the right eye and the polarizing plate for the left eye by 90 ° or more.
[0013] 本発明の液晶画像表示装置にあっては、右眼用偏光板及び Zまたは左眼用偏光 板を回転させて、両偏光板の偏光方向を一致させることにより、立体画像表示用眼 鏡が秘匿画像表示用眼鏡として利用可能となり、一つの装置で、通常画像表示に加 えて、秘匿画像表示と立体画像表示とを共に実現できる。  In the liquid crystal image display device of the present invention, the right-eye polarizing plate and the Z or left-eye polarizing plate are rotated so that the polarization directions of both polarizing plates coincide with each other. The mirror can be used as the hidden image display glasses, and in addition to the normal image display, both the hidden image display and the stereoscopic image display can be realized with one apparatus.
[0014] 本発明に係る液晶画像表示装置は、第 1の偏光板、第 1の液晶パネル、第 2の偏光 板及び第 2の液晶パネルをこの順に積層してなる表示装置本体と、該表示装置本体 の前記第 2の液晶パネルに対向して配置される第 3の偏光板とを備える液晶画像表 示装置において、前記第 3の偏光板の一部を 90° 以上回転させる手段を備えること を特徴とする。  [0014] A liquid crystal image display device according to the present invention includes a display device body in which a first polarizing plate, a first liquid crystal panel, a second polarizing plate, and a second liquid crystal panel are laminated in this order, and the display In a liquid crystal image display device comprising a third polarizing plate disposed opposite to the second liquid crystal panel of the device body, the liquid crystal image display device includes means for rotating a part of the third polarizing plate by 90 ° or more. It is characterized by.
[0015] 本発明の液晶画像表示装置にあっては、第 3の偏光板 (観察用の偏光板)の一部 を回転させて、その一部と残りの部分とで偏光方向を異ならせることにより、秘匿画像 表示用眼鏡が立体画像表示用眼鏡として利用可能となり、一つの装置で、通常画像 表示に加えて、秘匿画像表示と立体画像表示とを共に実現できる。 [0015] In the liquid crystal image display device of the present invention, a part of the third polarizing plate (observation polarizing plate) is rotated to change the polarization direction between the part and the remaining part. Thus, the confidential image display glasses can be used as stereoscopic image display glasses, and a normal image can be obtained with one device. In addition to the display, both the secret image display and the stereoscopic image display can be realized.
[0016] 本発明に係る液晶画像表示装置は、前記表示装置本体が、前記第 2の液晶パネ ルに積層される第 1の 1Z4波長板を有しており、該第 1の 1Z4波長板に対向させて 前記第 3の偏光板に第 2の 1Z4波長板を重着してあることを特徴とする。  [0016] In the liquid crystal image display device according to the present invention, the display device body has a first 1Z4 wavelength plate laminated on the second liquid crystal panel, and the first 1Z4 wavelength plate includes the first 1Z4 wavelength plate. A second 1Z4 wavelength plate is overlapped with the third polarizing plate so as to face each other.
[0017] 本発明の液晶画像表示装置にあっては、第 2の液晶パネルから出射された光が第 1の 1Z4波長板で円偏光光に変換され、その円偏光光は第 2の 1Z4波長板でもと に戻り、第 3の偏光板を介して画像が観察される。表示装置本体からの出射光は円 偏光が施されており、肉眼ではもとより単なる偏光板を介しても画像を判別できない。 よって、反射光の入射を遮断する OA眼鏡、サングラスなどの一般的な用途の眼鏡で 画像が読み取られることを防止する。  In the liquid crystal image display device of the present invention, the light emitted from the second liquid crystal panel is converted into circularly polarized light by the first 1Z4 wavelength plate, and the circularly polarized light is converted into the second 1Z4 wavelength. Returning to the plate, the image is observed through the third polarizing plate. The light emitted from the display device main body is circularly polarized, and an image cannot be discriminated by the naked eye as well as through a simple polarizing plate. Therefore, it prevents the image from being read by glasses for general use such as OA glasses and sunglasses that block the incidence of reflected light.
発明の効果  The invention's effect
[0018] 本発明では、第 1の液晶パネルで各画素における光透過強度を制御し、第 2の液 晶パネルで各画素における液晶の回転角を制御するようにしたので、小型の構成に てフリツ力を発生することなぐ立体画像を表示することができる。  In the present invention, the light transmission intensity in each pixel is controlled by the first liquid crystal panel, and the rotation angle of the liquid crystal in each pixel is controlled by the second liquid crystal panel. A stereoscopic image that does not generate flickering force can be displayed.
[0019] 本発明では、一つの眼鏡で立体画像表示用眼鏡と秘匿画像表示用眼鏡とを兼用 することができ、一つの装置で、通常画像表示と秘匿画像表示と立体画像表示との 3 種の表示モードを実現することができる。 [0019] In the present invention, a pair of glasses for stereoscopic image display and a pair of glasses for secret image display can be used with a single pair of glasses, and three types of normal image display, secret image display, and three-dimensional image display can be performed with a single device. The display mode can be realized.
[0020] 本発明では、表示装置本体から第 1の 1Z4波長板で円偏光を施した光を出射させIn the present invention, light that has been circularly polarized by the first 1Z4 wavelength plate is emitted from the display device body.
、その円偏光光を眼鏡の第 2の 1Z4波長板で直線偏光光に戻すようにしたので、単 に偏光板が装着されて 、る眼鏡では画像を判別できず、秘匿機能を高めることがで きる。 Since the circularly polarized light is converted back to linearly polarized light by the second 1Z4 wavelength plate of the glasses, the polarizing plate is simply attached, and the glasses cannot be discriminated to improve the concealment function. wear.
図面の簡単な説明  Brief Description of Drawings
[0021] [図 1]第 1実施の形態による液晶画像表示装置の構成を示す模式図である。 FIG. 1 is a schematic diagram showing a configuration of a liquid crystal image display device according to a first embodiment.
[図 2]通常画像表示モードにおける液晶画像表示装置の概略構成を示す図である。  FIG. 2 is a diagram showing a schematic configuration of a liquid crystal image display device in a normal image display mode.
[図 3]秘匿画像表示モードにおける液晶画像表示装置の概略構成を示す図である。  FIG. 3 is a diagram showing a schematic configuration of a liquid crystal image display device in a secret image display mode.
[図 4]立体画像表示モードにおける液晶画像表示装置の概略構成を示す図である。  FIG. 4 is a diagram showing a schematic configuration of a liquid crystal image display device in a stereoscopic image display mode.
[図 5]立体画像表示モードにおける制御範囲を示す模式図である。  FIG. 5 is a schematic diagram showing a control range in a stereoscopic image display mode.
[図 6]第 2実施の形態による液晶画像表示装置の構成を示す模式図である。 [図 7]第 3実施の形態による液晶画像表示装置の構成を示す模式図である。 FIG. 6 is a schematic diagram showing a configuration of a liquid crystal image display device according to a second embodiment. FIG. 7 is a schematic diagram showing a configuration of a liquid crystal image display device according to a third embodiment.
符号の説明  Explanation of symbols
[0022] 1, 51 表示装置本体 [0022] 1, 51 Display device body
2 第 1の偏光板  2 First polarizing plate
3 第 1の液晶パネル  3 First LCD panel
4 第 2の偏光板  4 Second polarizing plate
5 第 2の液晶パネル  5 Second LCD panel
6 第 1の 1 4波長板  6 First 1 4 wave plate
7 ノ ックライト  7 Knocklight
10, 60， 70 観察用眼鏡  10, 60, 70 Observation glasses
11 第 2の 1Z4波長板  11 Second 1Z4 wave plate
12 右眼用偏光板  12 Right-eye polarizing plate
13 左眼用偏光板  13 Left-eye polarizing plate
14， 74 回転機構  14, 74 Rotating mechanism
21, 31， 41 画像メモリ  21, 31, 41 Image memory
22, 32 ノ ネ /レドライノく  22, 32 None / Redino
42 強度演算器  42 Strength calculator
43 回転角演算器  43 Rotation angle calculator
44 第 1パネルドライバ  44 1st panel driver
45 第 2パネルドライバ  45 Second panel driver
72 第 3の偏光板  72 3rd polarizing plate
発明を実施するための最良の形態  BEST MODE FOR CARRYING OUT THE INVENTION
[0023] 本発明をその実施の形態を示す図面を参照して具体的に説明する。なお、本発明 は以下の実施の形態に限定されるものではない。 [0023] The present invention will be specifically described with reference to the drawings illustrating embodiments thereof. The present invention is not limited to the following embodiment.
[0024] (第 1実施の形態） [0024] (First embodiment)
図 1は、第 1実施の形態による液晶画像表示装置の構成を示す模式図である。この 液晶画像表示装置は、表示装置本体 1と観察用眼鏡 10とを備える。  FIG. 1 is a schematic diagram showing the configuration of the liquid crystal image display device according to the first embodiment. The liquid crystal image display device includes a display device body 1 and observation glasses 10.
[0025] 表示装置本体 1は、背面側から、第 1の偏光板 2、第 1の液晶パネル 3、第 2の偏光 板 4、第 2の液晶パネル 5及び第 1の 1Z4波長板 6をこの順に積層させた構成を有し ており、第 1の偏光板 2の背面側には、光源となるノ ックライト 7が設けられている。即 ち、表示装置本体 1は、第 1の液晶パネル 3と第 2の液晶パネル 5との 2種類の液晶パ ネルを有しており、第 1の液晶パネル 3は、偏光方向が互いに直交する第 1の偏光板 2と第 2の偏光板 4との間に配設されている。前面に第 1の 1Z4波長板 6が重着され た第 2の液晶パネル 5は、第 2の偏光板 4の背面側に配設されている。なお、第 1の偏 光板 2及び第 2の偏光板 4の偏光方向には任意性があるが、ここでは一般的な平行 ニコル構成として考える。 [0025] The display device body 1 includes, from the back side, the first polarizing plate 2, the first liquid crystal panel 3, and the second polarized light. The plate 4, the second liquid crystal panel 5, and the first 1Z4 wavelength plate 6 are laminated in this order, and a knock light 7 serving as a light source is provided on the back side of the first polarizing plate 2. It has been. That is, the display device body 1 has two types of liquid crystal panels, a first liquid crystal panel 3 and a second liquid crystal panel 5, and the first liquid crystal panel 3 has the polarization directions orthogonal to each other. Disposed between the first polarizing plate 2 and the second polarizing plate 4. The second liquid crystal panel 5 in which the first 1Z4 wave plate 6 is attached to the front is disposed on the back side of the second polarizing plate 4. Note that although the polarization directions of the first polarizing plate 2 and the second polarizing plate 4 are arbitrary, here, a general parallel Nicol configuration is considered.
[0026] 第 1の液晶パネル 3、第 2の液晶パネル 5はいずれも、所定の間隔を隔てて対向さ れたガラス板間の空隙に液晶分子を封入し、ガラス板の内側にそれぞれ形成された 複数の透明電極が互いに直交するように構成されている。なお、液晶分子の偏光方 向には任意性があるが、ここでは偏光を 90° 回転させる状態を初期状態になるよう にする。  [0026] Both the first liquid crystal panel 3 and the second liquid crystal panel 5 are formed inside the glass plate by sealing liquid crystal molecules in the gaps between the glass plates opposed to each other with a predetermined interval. The plurality of transparent electrodes are configured to be orthogonal to each other. The polarization direction of the liquid crystal molecules is arbitrary, but here the state where the polarization is rotated by 90 ° is set to the initial state.
[0027] 立体画像表示モード、秘匿画像表示モードでの駆動方法を考える場合、第 2の偏 光板 4の偏光方向は、第 1の 1 Z4波長板 6の右旋性軸または左旋性軸に一致してる ことが望ましぐここでは、説明を簡単にするために、第 2の偏光板 4の偏光方向は、 第 1の 1Z4波長板 6の右旋性軸と一致していて平行であるとする。  [0027] When considering the driving method in the stereoscopic image display mode and the secret image display mode, the polarization direction of the second polarizing plate 4 is the same as the dextrorotatory axis or the levorotatory axis of the first 1Z4 wavelength plate 6. Here, for the sake of simplicity, it is assumed that the polarization direction of the second polarizing plate 4 coincides with the dextrorotatory axis of the first 1Z4 wave plate 6 and is parallel. To do.
[0028] 一方、観察用眼鏡 10は、表示装置本体 1側から、第 2の 1Z4波長板 11と、右眼用 偏光板 12及び左眼用偏光板 13とを積層させた構成を有しており、観察者に装着可 能である。右眼用偏光板 12と左眼用偏光板 13との偏光方向は互いに直交しており 、右眼用偏光板 12の偏光方向は第 2の偏光板 4の偏光方向に等しぐ左眼用偏光 板 13の偏光方向は第 1の偏光板 2の偏光方向に等しい。また、右眼用偏光板 12に は回転機構 14が接続されており、右眼用偏光板 12を 90° 以上回転できてその偏光 方向を変更できるようになつている。  On the other hand, the observation glasses 10 have a configuration in which a second 1Z4 wavelength plate 11, a right-eye polarizing plate 12, and a left-eye polarizing plate 13 are laminated from the display device body 1 side. It can be attached to the observer. The polarization directions of the right-eye polarizing plate 12 and the left-eye polarizing plate 13 are orthogonal to each other, and the polarization direction of the right-eye polarizing plate 12 is equal to the polarization direction of the second polarizing plate 4 for the left eye. The polarization direction of the polarizing plate 13 is equal to the polarization direction of the first polarizing plate 2. In addition, a rotation mechanism 14 is connected to the right-eye polarizing plate 12 so that the right-eye polarizing plate 12 can be rotated by 90 ° or more and its polarization direction can be changed.
[0029] 次に、このような構成をなす液晶画像表示装置の動作について説明する。第 1実施 の形態の液晶画像表示装置では、この一つの装置で、通常画像表示と秘匿画像表 示と立体画像表示とを実現できる。以下、各表示モードについて詳述する。  Next, the operation of the liquid crystal image display device having such a configuration will be described. In the liquid crystal image display device of the first embodiment, normal image display, secret image display, and stereoscopic image display can be realized with this single device. Hereinafter, each display mode will be described in detail.
[0030] 〔通常画像表示モード〕 図 2は、通常画像表示モードにおける液晶画像表示装置の概略構成を示す図であ る。通常画像表示では、観察用眼鏡 10は使用せず、観察者が直接、表示装置本体 1に視線を向ける。 [Normal image display mode] FIG. 2 is a diagram showing a schematic configuration of the liquid crystal image display device in the normal image display mode. In normal image display, the eyeglasses for observation 10 are not used, and the observer looks directly at the display device body 1.
[0031] 図 2において、 21は、外部から入力される通常画像用の画像信号を格納する画像 メモリである。画像メモリ 21から、画素データがパネルドライバ 22へ順次出力される。 パネルドライバ 22は、この画素データに応じた光透過率が各画素単位で得られるよう に、第 1の液晶パネル 3の透明電極に印加する電圧を制御する。通常画像表示時に は、第 2の液晶パネル 5の全ての透明電極に電圧が印加されない。  In FIG. 2, 21 is an image memory for storing an image signal for a normal image input from the outside. Pixel data is sequentially output from the image memory 21 to the panel driver 22. The panel driver 22 controls the voltage applied to the transparent electrode of the first liquid crystal panel 3 so that the light transmittance corresponding to the pixel data is obtained for each pixel. During normal image display, no voltage is applied to all the transparent electrodes of the second liquid crystal panel 5.
[0032] 第 1の偏光板 2の偏光方向の偏光成分のみが第 1の液晶パネル 3に入射する。この 偏光成分は、第 1の液晶パネル 3を透過する間に、電圧が印加されていない領域で は 90° 旋回し、電圧が印加されている領域では旋回しない。第 1の液晶パネル 3を 透過する間に 90° 旋回した偏光成分は、第 2の偏光板 4を透過するので明るく見え る力 第 1の液晶パネル 3を透過する間に旋回しない偏光成分は、第 2の偏光板 4を 透過できな ヽので暗くなる。  Only the polarization component in the polarization direction of the first polarizing plate 2 enters the first liquid crystal panel 3. While passing through the first liquid crystal panel 3, this polarization component rotates 90 ° in a region where no voltage is applied, and does not rotate in a region where a voltage is applied. The polarization component rotated 90 ° during transmission through the first liquid crystal panel 3 is transmitted through the second polarizing plate 4 and thus the light component appears bright.The polarization component that does not rotate during transmission through the first liquid crystal panel 3 is The second polarizing plate 4 is dark because it cannot pass through.
[0033] 第 2の液晶パネル 5には電圧が印加されておらず、第 2の偏光板 4を通過した光は 、第 2の液晶パネル 5によって 90° 旋回する。第 2の液晶パネル 5を透過した偏光成 分は、第 1の 1Z4波長板 6によって円偏光に変換されるが、円偏光に変換された光と 影とで画像が表示されるため、観察者は画像を視認することができる。  No voltage is applied to the second liquid crystal panel 5, and the light that has passed through the second polarizing plate 4 turns 90 ° by the second liquid crystal panel 5. The polarized light component transmitted through the second liquid crystal panel 5 is converted into circularly polarized light by the first 1Z4 wave plate 6, but an image is displayed with the light and shadow converted into circularly polarized light. Can visually recognize the image.
[0034] 液晶パネルにおける画素は 2次元配列であるので、画素の位置を i行 j列で表現す る場合、その画素の階調を p (t)で表す。各画素の階調は時間の関数であり、パネル ドライバ 22が階調制御を行える。  [0034] Since the pixels in the liquid crystal panel are two-dimensionally arranged, when the pixel position is represented by i rows and j columns, the gradation of the pixel is represented by p (t). The gradation of each pixel is a function of time, and the panel driver 22 can perform gradation control.
[0035] 一般に、第 2の偏光板 4を出射する i行 j列の画素の電界ベクトル T (t)は、下記式 で表される。但し、 Eは第 2の偏光板 4を通過した後の電界強度であって、理想的に は全画面領域で一様であり、 eは第 1の 1Z4波長板 6の右旋軸の単位方向ベクトル [0035] In general, the electric field vector T (t) of the pixel in i row and j column exiting the second polarizing plate 4 is expressed by the following equation. Where E is the electric field intensity after passing through the second polarizing plate 4, ideally uniform over the entire screen area, and e is the unit direction of the right-handed axis of the first 1Z4 wave plate 6 vector
d  d
である。なお、ここでは計算上意味がないので、時間依存項は省略する。  It is. Here, since there is no meaning in calculation, the time-dependent term is omitted.
T (t) =E - sin 0 (t) - e  T (t) = E-sin 0 (t)-e
ij 1 ij d  ij 1 ij d
[0036] このとき、階調を p (t)は、 p (t) c sin Θ (t)となる。第一次近似的には、 Θ (t)が 各画素の液晶への印加電圧 V (t)に比例すると考えられるので、比例定数を (Xとし て p (t) c sin { « V (t) }となるため、各画素単位での印加電圧の制御により、各画 素の階調を調整することが可能である。 At this time, the gradation p (t) becomes p (t) c sin Θ (t). In the first approximation, Θ (t) is considered to be proportional to the voltage V (t) applied to the liquid crystal of each pixel. Since p (t) c sin {«V (t)}, it is possible to adjust the gradation of each pixel by controlling the applied voltage for each pixel.
[0037] 〔秘匿画像表示モード〕  [Secret image display mode]
図 3は、秘匿画像表示モードにおける液晶画像表示装置の概略構成を示す図であ る。秘匿画像表示では、観察用眼鏡 10の右眼用偏光板 12を回転機構 14によって 回転させ、右眼用偏光板 12の偏光方向を左眼用偏光板 13及び第 1の偏光板 2の偏 光方向に一致させておく。  FIG. 3 is a diagram showing a schematic configuration of the liquid crystal image display device in the secret image display mode. In the concealed image display, the right-eye polarizing plate 12 of the observation glasses 10 is rotated by the rotation mechanism 14, and the polarization direction of the right-eye polarizing plate 12 is changed to the polarization of the left-eye polarizing plate 13 and the first polarizing plate 2. Match the direction.
[0038] 図 3において、 31は、外部から入力される秘匿画像用の画像信号を格納する画像 メモリである。画像メモリ 31から、画素データがパネルドライバ 32へ順次出力される。 パネルドライバ 32は、この画素データに応じた光透過率が各画素単位で得られるよう に、第 2の液晶パネル 5の透明電極に印加する電圧を制御する。秘匿画像表示時に は、第 1の液晶パネル 3の全ての透明電極に電圧が印加されない。  In FIG. 3, 31 is an image memory for storing an image signal for a secret image input from the outside. Pixel data is sequentially output from the image memory 31 to the panel driver 32. The panel driver 32 controls the voltage applied to the transparent electrode of the second liquid crystal panel 5 so that the light transmittance corresponding to the pixel data is obtained for each pixel. When the secret image is displayed, no voltage is applied to all the transparent electrodes of the first liquid crystal panel 3.
[0039] 第 1の偏光板 2の偏光方向の偏光成分のみが第 1の液晶パネル 3に入射する。第 1 の液晶パネル 3には電圧が印加されておらず、第 1の液晶パネル 3に入射した偏光 成分は 90° 旋回した後、第 2の偏光板 4を透過する。そして、偏光成分は、第 2の液 晶パネル 5を透過する間に、電圧が印加されていない領域では 90° 旋回し、電圧が 印加されている領域では旋回しない。この結果、 90° 旋回した偏光成分と 90° 旋回 しない偏光成分とからなる、肉眼では判別できない画像 (秘匿画像)が第 2の液晶パ ネル 5に表示される。  Only the polarization component in the polarization direction of the first polarizing plate 2 is incident on the first liquid crystal panel 3. No voltage is applied to the first liquid crystal panel 3, and the polarization component incident on the first liquid crystal panel 3 rotates through 90 ° and then passes through the second polarizing plate 4. Then, while passing through the second liquid crystal panel 5, the polarization component rotates 90 ° in a region where no voltage is applied and does not rotate in a region where a voltage is applied. As a result, the second liquid crystal panel 5 displays an image (a secret image) that is composed of a polarization component rotated 90 ° and a polarization component that does not rotate 90 °, which cannot be discriminated with the naked eye.
[0040] 第 2の液晶パネル 5を透過した偏光成分は、第 1の 1Z4波長板 6によってそれぞれ 回転方向が異なる円偏光光に変換され、肉眼では勿論、単なる偏光板を通しても判 別できない画像が形成される。このような画像を、第 2の 1Z4波長板 11付きの偏光 板 (偏光方向が同じである右眼用偏光板 12及び左眼用偏光板 13)を通して見ると、 円偏光光が元の偏光成分に戻され、その偏光成分を判別できる。よって、観察用眼 鏡 10を装着した観察者は、観察用眼鏡 10を装着して 、な 、他の人は見えな 、秘匿 画像を視認することができる。  [0040] The polarized light component transmitted through the second liquid crystal panel 5 is converted into circularly polarized light having different rotation directions by the first 1Z4 wave plate 6, and an image that cannot be discerned by the naked eye or through a simple polarizing plate. It is formed. When such an image is viewed through the second polarizing plate with the 1Z4 wavelength plate 11 (the polarizing plate for the right eye 12 and the polarizing plate for the left eye 13 having the same polarization direction), the circularly polarized light is the original polarization component. And the polarization component can be discriminated. Therefore, the observer wearing the observation eyeglass 10 can wear the observation eyeglasses 10 and can visually recognize the secret image that cannot be seen by other people.
[0041] 第 1の 1Z4波長板 6に入射される光の電界ベクトル E (t)は、下記式で表される。  [0041] The electric field vector E (t) of the light incident on the first 1Z4 wavelength plate 6 is expressed by the following equation.
但し、 I T (t) Iは電界ベクトル T (t)の大きさであり、 eは第 1の 1/4波長板 6の左 旋軸の単位方向ベクトルである。 Where IT (t) I is the magnitude of the electric field vector T (t), and e is the left of the first quarter-wave plate 6 This is the unit direction vector of the pivot axis.
E (t) = I T (t)  E (t) = I T (t)
ij I - cos (t) - e  ij I-cos (t)-e
ij ij d  ij ij d
+ I T (t) I - sin (t) - e  + I T (t) I-sin (t)-e
ij ij 1  ij ij 1
[0042] ここで、全画素において、 I T (t) I = I T I ( =一定）とした場合、電界ベクトル E  [0042] Here, in all pixels, when I T (t) I = I T I (= constant), the electric field vector E
(t)は、下記式のようになる。  (t) is expressed by the following equation.
E (t) = I T I - cos (t) - e +  E (t) = I T I-cos (t)-e +
ij d I T I - sin (t) - e  ij d I T I-sin (t)-e
ij ij 1  ij ij 1
[0043] よって、第 1の 1Z4波長板 6を通過する光は、右旋性円偏光光と左旋性円偏光光 となり、 i行 j列の画素で右旋性円偏光光と左旋性円偏光光との強度比が cos2 φ (t)[0043] Therefore, the light passing through the first 1Z4 wavelength plate 6 becomes dextrorotatory circularly polarized light and levorotatory circularly polarized light, and dextrorotatory circularly polarized light and levorotatory circularly polarized light at the pixel in i row and j column. The intensity ratio with light is cos 2 φ (t)
： sin φ (t)となるように制御できる。このとき、第 1の 1Z4波長板 6と第 2の 1Z4波長 板 11との間では、右旋性円偏光光と左旋性円偏光光とを肉眼では区別できないた め、 I τ (t) I = I τ Iの全画素一様な輝度状態として認識する。 : It can be controlled to be sin φ (t). At this time, between the first 1Z4 wavelength plate 6 and the second 1Z4 wavelength plate 11, the right-handed circularly polarized light and the left-handed circularly polarized light cannot be distinguished with the naked eye, so I τ (t) I = Recognized as a uniform luminance state for all pixels of I τ I.
[0044] 第 1の 1Z4波長板 6からの光が第 2の 1Z4波長板 11で直線偏光に戻され、いず れかの偏光成分を取りだすことにより、観察用眼鏡 10を装着した観察者は、秘匿画 像を視認する。この場合、左旋軸の光を偏光板 (右眼用偏光板 12及び左眼用偏光 板 13)で取り出せば、各画素の階調 p (t)は、 p (t) c sin φ (t)となる。よって、第 2 の液晶パネル 5の各画素単位での印加電圧の制御により、各画素の階調を調整した 秘匿画像を表示することが可能である。  [0044] When the light from the first 1Z4 wavelength plate 6 is returned to linearly polarized light by the second 1Z4 wavelength plate 11 and one of the polarized components is extracted, the observer wearing the observation glasses 10 Visually check the secret image. In this case, if the left-handed axis light is extracted by the polarizing plates (the right-eye polarizing plate 12 and the left-eye polarizing plate 13), the gradation p (t) of each pixel is p (t) c sin φ (t) It becomes. Therefore, it is possible to display a secret image in which the gradation of each pixel is adjusted by controlling the applied voltage for each pixel of the second liquid crystal panel 5.
[0045] なお、上述した例では、第 1の液晶パネル 3には電圧を印加しな 、ようにして秘匿 画像のみを表示させるようにした力 これとは異なり、第 1の液晶パネル 3にも画像表 示用の電圧を印加し、誰でも見ることができる通常画像に重畳させて秘匿画像を表 示するようにしても良い。 [0045] In the above-described example, the first liquid crystal panel 3 has a force to display only the secret image without applying a voltage to the first liquid crystal panel 3. A secret image may be displayed by applying a voltage for displaying an image and superimposing it on a normal image that can be viewed by anyone.
[0046] 〔立体画像表示モード〕 [Stereoscopic image display mode]
図 4は、立体画像表示モードにおける液晶画像表示装置の概略構成を示す図であ る。立体画像表示では、右眼用偏光板 12は回転させない。  FIG. 4 is a diagram showing a schematic configuration of the liquid crystal image display device in the stereoscopic image display mode. In stereoscopic image display, the right-eye polarizing plate 12 is not rotated.
[0047] 図 4において 41は、外部力も入力される右眼用画像信号と左眼用画像信号とを格 納する画像メモリである。画像メモリ 41から、右眼用画像の画素データ (画素レベル aIn FIG. 4, reference numeral 41 denotes an image memory for storing a right eye image signal and a left eye image signal to which an external force is also input. From the image memory 41, the pixel data of the right-eye image (pixel level a
)及び左眼用画像の画素データ (画素レベル b)が、強度演算器 42と回転角演算器 4) And left-eye image pixel data (pixel level b) are obtained from the intensity calculator 42 and the rotation angle calculator 4.
3とに順次出力される。 [0048] 強度演算器 42は、両画素データの合成レベル (具体的には（a2 +b2 ) 1/2 )を演算し 、その演算結果を第 1パネルドライバ 44へ出力する。第 1パネルドライバ 44は、この 演算結果に応じた透過光強度 (光透過率）が各画素単位で得られるように、第 1の液 晶パネル 3の透明電極に印加する電圧を制御する。一方、回転角演算器 43は、両 画素データのレベル比を表すパラータ値 (具体的には tan (bZa) )を演算し、その演 算結果を第 2パネルドライバ 45へ出力する。第 2パネルドライバ 45は、この演算結果 に応じた液晶の回転角（透過光のねじれ角）が画素単位で得られるように、第 2の液 晶パネル 5の透明電極に印加する電圧を制御する。 Are output sequentially to 3. [0048] The intensity calculator 42 calculates the composite level (specifically (a 2 + b 2 ) 1/2 ) of both pixel data, and outputs the calculation result to the first panel driver 44. The first panel driver 44 controls the voltage applied to the transparent electrode of the first liquid crystal panel 3 so that the transmitted light intensity (light transmittance) corresponding to the calculation result is obtained for each pixel. On the other hand, the rotation angle calculator 43 calculates a parameter value (specifically, tan (bZa)) representing the level ratio of both pixel data, and outputs the calculation result to the second panel driver 45. The second panel driver 45 controls the voltage applied to the transparent electrode of the second liquid crystal panel 5 so that the rotation angle of the liquid crystal (the twist angle of transmitted light) corresponding to the calculation result can be obtained in units of pixels. .
[0049] 観察者は、第 2の 1Z4波長板 11と、右眼用偏光板 12及び左眼用偏光板 13とを有 する観察用眼鏡 10を装着して、表示装置本体 1の方向に視線を向ける。この際、右 眼用偏光板 12は回転させず、観察用眼鏡 10の右眼用偏光板 12の偏光方向と左眼 用偏光板 13の偏光方向とは互いに直交している。  [0049] An observer wears eyeglasses 10 for observation having a second 1Z4 wavelength plate 11, a polarizing plate 12 for the right eye, and a polarizing plate 13 for the left eye, and looks toward the display device body 1. Turn. At this time, the right-eye polarizing plate 12 is not rotated, and the polarization direction of the right-eye polarizing plate 12 of the observation glasses 10 and the polarization direction of the left-eye polarizing plate 13 are orthogonal to each other.
[0050] 第 2の偏光板 4を通過した光に対して、第 2の液晶パネル 5と第 1の 1Z4波長板 6と で円偏光の制御を行う。そして、表示装置本体 1 (第 1の 1Z4波長板 6)からの光を、 観察者が第 2の 1Z4波長板 11と右眼用偏光板 12及び左眼用偏光板 13を通して見 る。第 2の液晶パネル 5で行う円偏光制御の画像ィ匕を左右で独立に制御できるため、 立体画像の表示を実現できる。  With respect to the light that has passed through the second polarizing plate 4, circular polarization is controlled by the second liquid crystal panel 5 and the first 1Z4 wavelength plate 6. Then, the observer views the light from the display device body 1 (first 1Z4 wavelength plate 6) through the second 1Z4 wavelength plate 11, the right-eye polarizing plate 12, and the left-eye polarizing plate 13. Since the image of circular polarization control performed on the second liquid crystal panel 5 can be controlled independently on the left and right, a stereoscopic image can be displayed.
[0051] 第 1の 1Z4波長板 6に入射される光の電界ベクトル E (t)は、下記式で表される。  [0051] The electric field vector E (t) of the light incident on the first 1Z4 wavelength plate 6 is expressed by the following equation.
E (t) = I T (t) I - cos 0 (t) - e  E (t) = I T (t) I-cos 0 (t)-e
d  d
+ I T (t) I - sin 0 (t) - e  + I T (t) I-sin 0 (t)-e
ij ij 1  ij ij 1
=E e sin Θ (t) e cos φ (t) e e = E e sin Θ (t) e cos φ (t) e e
1 ij ij d  1 ij ij d
+E e sin Θ (t) · sin φ (t) e e + E e sin Θ (t) sin φ (t) e e
1 ij ij 1  1 ij ij 1
=E · {a e e +b e e } = E · {a e e + b e e}
1 d 1  1 d 1
[0052] 各画素について、 θ (t)と φ (t)との 2つの独立な制御パラメータがあるので、 a, b を独立に制御できる。この制御範囲の最大値 cは、 a2 +b2≤2c2 = 1の関係を満たし て、 c= l/ 2となる。図 5は、この制御範囲を示す模式図であり、半径 1の円内で独 立に制御できる最大範囲の正方形の一辺の長さが 2となることから、この最大値 c の大きさを理解できる。 [0053] i行 j列の画素について、第 1の 1Z4波長板 6に入射される光の電界ベクトル E (t) 力 E (t) =E - {a-e +b 'e }で表される場合、第 1の 1/4波長板 6を通過する光は ij 1 d 1 [0052] For each pixel, since there are two independent control parameters, θ (t) and φ (t), a and b can be controlled independently. The maximum value c of this control range satisfies the relationship of a 2 + b 2 ≤2c 2 = 1 and c = l / 2. Fig. 5 is a schematic diagram showing this control range. Since the length of one side of the square of the maximum range that can be controlled independently within a circle with a radius of 1 is 2, we understand the size of this maximum value c. it can. [0053] When the pixel of i row and j column is represented by the electric field vector E (t) force E (t) = E-{ae + b 'e} of light incident on the first 1Z4 wavelength plate 6 The light passing through the first quarter-wave plate 6 is ij 1 d 1
右旋性円偏光光と左旋性円偏光光とになるので、 i行 j列の画素で右旋性円偏光光と 左旋性円偏光光との強度比が a2： b2となるように制御できる。 Since on the right-handed circularly polarized light and left-handed circularly polarized light, i-line intensity ratio of the j-columns of pixels and dextrorotatory circularly polarized light and left-handed circularly polarized light a 2: such that b 2 Can be controlled.
[0054] したがって、この第 1の 1Z4波長板 6からの光を、第 2の 1Z4波長板 11と右眼用偏 光板 12及び左眼用偏光板 13とを有する観察用眼鏡 10を装着することにより、第 2の 1Z4波長板 11によって円偏光を直線偏光に戻した後、第 2の 1Z4波長板 11からの 右旋軸の光及び左旋軸の光が混在した光を、右眼用偏光板 12と左眼用偏光板 13と によって、右旋軸の光と左旋軸の光とに分離することにより、立体画像が観察者に視 認される。この際、左の眼と右の眼それぞれに、右旋性円偏光光、左旋性円偏光光 のいずれを適用するかは任意である。立体画像表示では、光を左眼用と右眼用とに 分割するので、画面の輝度は通常画像表示の場合の半分となる。  [0054] Therefore, the light from the first 1Z4 wavelength plate 6 is attached to the observation glasses 10 having the second 1Z4 wavelength plate 11, the right-eye polarizing plate 12, and the left-eye polarizing plate 13. After the circularly polarized light is converted back to linearly polarized light by the second 1Z4 wavelength plate 11, the right-handed and left-handed light from the second 1Z4 wavelength plate 11 is mixed into the right-eye polarizing plate. By separating the light into the right-handed axis and the left-handed axis by the left-eye polarizing plate 13 and the left-eye polarizing plate 13, a stereoscopic image is recognized by the observer. At this time, it is arbitrary whether to apply right-handed circularly polarized light or left-handed circularly polarized light to the left eye and the right eye. In stereoscopic image display, since the light is divided into left and right eyes, the brightness of the screen is half that of normal image display.
[0055] 任意の組 (a, b) (但し、 a≥0、 b≥0)は、上述した電界ベクトル E (t)の表記式に基 づくと、下記のように表現できる。  [0055] An arbitrary set (a, b) (where a≥0, b≥0) can be expressed as follows based on the expression of the electric field vector E (t) described above.
φ (t) =arctan(b/ a)  φ (t) = arctan (b / a)
(但し、 a = 0のとき φ (t) = π Z2rad、  (However, when a = 0, φ (t) = π Z2rad,
b = 0のとき φ (t) =0)  (When b = 0, φ (t) = 0)
Θ (t) = arc sin {a/ cos φ (t) }  Θ (t) = arc sin {a / cos φ (t)}
ij  ij
[0056] 以上のようにして、第 1実施の形態の液晶画像表示装置では、装置の構成を変える ことなぐ通常画像表示と秘匿画像表示と立体画像表示とを一つの装置で実現する ことができる。また、第 1の 1Z4波長板 6及び第 2の 1Z4波長板 11を設ける構成にし たので、観察用眼鏡に単なる偏光板だけを用いただけでは画像を視認することがで きず、高度な秘匿性を得ることができる。  [0056] As described above, in the liquid crystal image display device according to the first embodiment, normal image display, secret image display, and stereoscopic image display can be realized by a single device without changing the configuration of the device. . In addition, since the first 1Z4 wavelength plate 6 and the second 1Z4 wavelength plate 11 are provided, it is not possible to view an image only by using only a polarizing plate for observation glasses, and a high degree of secrecy is achieved. Obtainable.
[0057] (第 2実施の形態）  [0057] (Second embodiment)
図 6は、第 2実施の形態による液晶画像表示装置の構成を示す模式図である。図 6 において、図 1と同一部分には同一番号を付してそれらの詳細な説明を省略する。  FIG. 6 is a schematic diagram showing the configuration of the liquid crystal image display device according to the second embodiment. In FIG. 6, the same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0058] 第 2実施の形態は、第 1実施の形態に比べて構成の簡素化を図った例である。第 2 実施の形態の表示装置本体 51は、背面側から、第 1の偏光板 2、第 1の液晶パネル 3、第 2の偏光板 4及び第 2の液晶パネル 5をこの順に積層させた構成を有し、第 1の 偏光板 2の背面側には、光源となるバックライト 7が設けられており、第 1実施の形態 の表示装置本体 1から第 1の 1Z4波長板 6を除去している。また、第 2実施の形態の 観察用眼鏡 60は、偏光方向が互いに直交している右眼用偏光板 12及び左眼用偏 光板 13を備えており、第 1実施の形態の観察用眼鏡 10から第 2の 1Z4波長板 11を 除去した構成である。 The second embodiment is an example in which the configuration is simplified as compared with the first embodiment. The display device main body 51 of the second embodiment includes a first polarizing plate 2 and a first liquid crystal panel from the back side. 3, the second polarizing plate 4 and the second liquid crystal panel 5 are stacked in this order, and the back side of the first polarizing plate 2 is provided with a backlight 7 as a light source, The first 1Z4 wavelength plate 6 is removed from the display device body 1 of the first embodiment. The observation glasses 60 of the second embodiment include the right-eye polarizing plate 12 and the left-eye polarization plate 13 whose polarization directions are orthogonal to each other, and the observation glasses 10 of the first embodiment. In this configuration, the second 1Z4 wavelength plate 11 is removed.
[0059] 第 1実施の形態における 2枚の 1Z4波長板は、表示画像の秘匿性を高めるために 設けているのであり、通常画像表示、秘匿画像表示、立体画像表示の何れの場合に も必須の光学部材ではない。そこで、第 2実施の形態では、これらの 1Z4波長板を 設けずに、通常画像表示と秘匿画像表示と立体画像表示とを一つの簡素な構成の 液晶画像表示装置で実現できるようにしている。第 2実施の形態は、第 1実施の形態 に比べて、小型化及び低コストィ匕を図ることができる。  [0059] The two 1Z4 wavelength plates in the first embodiment are provided to enhance the confidentiality of the display image, and are essential for any of normal image display, confidential image display, and stereoscopic image display. It is not an optical member. Therefore, in the second embodiment, these 1Z4 wave plates are not provided, and normal image display, secret image display, and stereoscopic image display can be realized by a liquid crystal image display device having a simple configuration. The second embodiment can be reduced in size and cost as compared with the first embodiment.
[0060] なお、第 1,第 2実施の形態では、右眼用偏光板 12が回転可能である構成としたが 、これとは逆に左眼用偏光板 13が回転可能であるようにしても良ぐまた、両方の偏 光板を回転可能とするようにしても良 、。  [0060] In the first and second embodiments, the right-eye polarizing plate 12 is configured to be rotatable. On the contrary, the left-eye polarizing plate 13 is configured to be rotatable. It is also possible to make both polarizing plates rotatable.
[0061] (第 3実施の形態）  [0061] (Third embodiment)
図 7は、第 3実施の形態による液晶画像表示装置の構成を示す模式図である。図 7 において、図 1,図 6と同一部分には同一番号を付してそれらの詳細な説明を省略す る。  FIG. 7 is a schematic diagram showing the configuration of the liquid crystal image display device according to the third embodiment. In FIG. 7, the same parts as those in FIGS. 1 and 6 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0062] 第 3実施の形態の画像装置本体 1の構成は、第 1実施の形態と同じである。第 3実 施の形態の観察用眼鏡 70は、表示装置本体 1側から、第 2の 1Z4波長板 11と、第 3 の偏光板 72とを積層させた構成を有しており、観察者に装着可能である。第 3の偏 光板 72の偏光方向は第 1の偏光板 2の偏光方向に等しい。第 3の偏光板 72には回 転機構 74が接続されており、第 3の偏光板 72の一部を 90° 以上回転してその偏光 方向を変更できるようになつている。  [0062] The configuration of the image device main body 1 of the third embodiment is the same as that of the first embodiment. The observation spectacles 70 of the third embodiment have a configuration in which a second 1Z4 wavelength plate 11 and a third polarizing plate 72 are laminated from the display device body 1 side. It can be installed. The polarization direction of the third polarizing plate 72 is equal to the polarization direction of the first polarizing plate 2. A rotation mechanism 74 is connected to the third polarizing plate 72, and a part of the third polarizing plate 72 can be rotated by 90 ° or more to change the polarization direction.
[0063] 通常画像表示モードの場合の動作は、第 1実施の形態の場合と全く同じである。秘 匿画像表示モード時には、第 3の偏光板 72を全く回転させない。この結果、第 1実施 の形態と同様に、第 2の液晶パネル 5で表示した秘匿画像を、観察用眼鏡 70を装着 した観察者のみが視認することができる。 [0063] The operation in the normal image display mode is exactly the same as that in the first embodiment. In the secret image display mode, the third polarizing plate 72 is not rotated at all. As a result, similar to the first embodiment, the confidential image displayed on the second liquid crystal panel 5 is attached to the observation glasses 70. Only the viewer who has performed can view it.
[0064] 立体画像表示モード時には、回転機構 74によって第 3の偏光板 72の一部を 90° 回転させて、その一部領域の偏光方向を第 2の偏光板 4の偏光方向に一致させる。 そして、この回転させた第 3の偏光板 72の一部領域を右眼用偏光板として使用し、 回転させな 、第 3の偏光板 72の残部領域を左眼用偏光板として使用する。この結果 、第 1実施の形態と同様に、観察用眼鏡 70を装着した観察者のみが立体画像を視 認することができる。  In the stereoscopic image display mode, the rotation mechanism 74 rotates a part of the third polarizing plate 72 by 90 ° so that the polarization direction of the partial region coincides with the polarization direction of the second polarizing plate 4. Then, a partial region of the rotated third polarizing plate 72 is used as a right-eye polarizing plate, and the remaining region of the third polarizing plate 72 is used as a left-eye polarizing plate without being rotated. As a result, as in the first embodiment, only the observer wearing the observation glasses 70 can view the stereoscopic image.
[0065] 以上のようにして、第 3実施の形態の液晶画像表示装置では、装置の構成を変える ことなぐ通常画像表示と秘匿画像表示と立体画像表示とを一つの装置で実現する ことができる。また、第 1の 1Z4波長板 6及び第 2の 1Z4波長板 11を設ける構成にし たので、観察用眼鏡に単なる偏光板だけを用いただけでは画像を視認することがで きず、高度な秘匿性を得ることができる。  As described above, in the liquid crystal image display device according to the third embodiment, normal image display, secret image display, and stereoscopic image display can be realized by a single device without changing the configuration of the device. . In addition, since the first 1Z4 wavelength plate 6 and the second 1Z4 wavelength plate 11 are provided, it is not possible to view an image only by using only a polarizing plate for observation glasses, and a high degree of secrecy is achieved. Obtainable.
[0066] なお、第 3実施の形態の液晶画像表示装置において、第 1の 1Z4波長板 6及び第 2の 1Z4波長板 11は、 3種類の表示モードを実現するために必須の光学部材では ないため、第 2実施の形態のようにこれらの 1Z4波長板を除去して簡素な構成とし、 小型化及び低コストィ匕を図るようにしても良 、ことは勿論である。  [0066] In the liquid crystal image display device of the third embodiment, the first 1Z4 wavelength plate 6 and the second 1Z4 wavelength plate 11 are not essential optical members for realizing three types of display modes. For this reason, as a matter of course, it is possible to remove these 1Z4 wavelength plates to form a simple configuration as in the second embodiment, so as to reduce the size and cost.

Claims

請求の範囲 The scope of the claims
[1] 右眼用画像及び左眼用画像を呈示して立体画像を表示する液晶画像表示装置に おいて、第 1の偏光板、第 1の液晶パネル、第 2の偏光板及び第 2の液晶パネルをこ の順に積層してなる表示装置本体と、該表示装置本体の前記第 2の液晶パネルに 対向して配置される右眼用偏光板及び左眼用偏光板と、右眼用画像信号及び左眼 用画像信号の大きさに基づいて前記第 1の液晶パネルでの透過光強度を制御する 手段と、右眼用画像信号及び左眼用画像信号の大きさに基づいて前記第 2の液晶 パネルでの透過光のねじれ角を制御する手段とを備えることを特徴とする液晶画像 表示装置。  [1] In a liquid crystal image display device that presents a right-eye image and a left-eye image and displays a stereoscopic image, the first polarizing plate, the first liquid crystal panel, the second polarizing plate, and the second polarizing plate A display device main body in which liquid crystal panels are laminated in this order, a right-eye polarizing plate and a left-eye polarizing plate disposed to face the second liquid crystal panel of the display device main body, and a right-eye image Means for controlling the transmitted light intensity in the first liquid crystal panel based on the magnitude of the signal and the image signal for the left eye, and the second based on the magnitude of the image signal for the right eye and the image signal for the left eye. And a means for controlling the twist angle of transmitted light in the liquid crystal panel.
[2] 前記表示装置本体は、前記第 2の液晶パネルに積層される第 1の 1Z4波長板を有 しており、該第 1の 1Z4波長板に対向させて前記右眼用偏光板及び左眼用偏光板 に第 2の 1Z4波長板を重着してあることを特徴とする請求項 1記載の液晶画像表示 装置。  [2] The display device main body includes a first 1Z4 wavelength plate laminated on the second liquid crystal panel, and the right-eye polarizing plate and the left-hand side are opposed to the first 1Z4 wavelength plate. 2. The liquid crystal image display device according to claim 1, wherein a second 1Z4 wavelength plate is adhered to the ophthalmic polarizing plate.
[3] 前記右眼用偏光板及び左眼用偏光板の少なくとも一方を 90° 以上回転させる手 段を備えることを特徴とする請求項 1または 2記載の液晶画像表示装置。  3. The liquid crystal image display device according to claim 1 or 2, further comprising a means for rotating at least one of the right-eye polarizing plate and the left-eye polarizing plate by 90 ° or more.
[4] 第 1の偏光板、第 1の液晶パネル、第 2の偏光板及び第 2の液晶パネルをこの順に 積層してなる表示装置本体と、該表示装置本体の前記第 2の液晶パネルに対向して 配置される第 3の偏光板とを備える液晶画像表示装置において、前記第 3の偏光板 の一部を 90° 以上回転させる手段を備えることを特徴とする液晶画像表示装置。  [4] A display device body in which the first polarizing plate, the first liquid crystal panel, the second polarizing plate, and the second liquid crystal panel are laminated in this order, and the second liquid crystal panel of the display device body A liquid crystal image display device comprising a third polarizing plate disposed opposite to the liquid crystal image display device, comprising means for rotating a part of the third polarizing plate by 90 ° or more.
[5] 前記表示装置本体は、前記第 2の液晶パネルに積層される第 1の 1Z4波長板を有 しており、該第 1の 1Z4波長板に対向させて前記第 3の偏光板に第 2の 1Z4波長板 を重着してあることを特徴とする請求項 4記載の液晶画像表示装置。  [5] The display device main body has a first 1Z4 wavelength plate laminated on the second liquid crystal panel, and the third polarizing plate is opposed to the first 1Z4 wavelength plate. 5. The liquid crystal image display device according to claim 4, wherein two 1Z4 wavelength plates are attached together.
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010525393A (en) * 2007-04-20 2010-07-22 スタンニー スリーディー，リミテッド ライアビリティー カンパニー Method for viewing stereoscopic video with maximum resolution in each direction and device implementing the method
WO2010142632A1 (en) * 2009-06-08 2010-12-16 Visumotion Gmbh Method for the two-dimensional perception of stereoscopic images
WO2011058784A1 (en) * 2009-11-13 2011-05-19 シャープ株式会社 Three-dimensional video recognition system, video display device and active shutter glasses
JP2012189687A (en) * 2011-03-09 2012-10-04 Fujifilm Corp Three dimensional display device, and three dimensional display system of time division system
KR101522551B1 (en) * 2008-01-30 2015-05-26 삼성전자주식회사 Stereoscopic image system
JP2015118191A (en) * 2013-12-17 2015-06-25 富士通株式会社 Information display system, information display device, and spectacles
CN104796686A (en) * 2015-04-07 2015-07-22 上海交通大学 Safety information display system and safety information display method based on spatial-domain psycho-visual modulation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6359296A (en) * 1986-08-29 1988-03-15 Seiko Epson Corp Stereoscopic liquid crystal television
JPS63182991A (en) * 1987-01-26 1988-07-28 Hitachi Ltd Stereoscopic television receiver
JPS63274918A (en) * 1987-05-06 1988-11-11 Jeco Co Ltd Liquid crystal stereoscopic display device
JPH04156419A (en) * 1990-10-19 1992-05-28 Natl Aerospace Lab Two-image simultaneous display panel
JPH05313146A (en) * 1992-05-15 1993-11-26 Fujitsu Ltd Liquid crystal display device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63150918A (en) * 1986-12-16 1988-06-23 Toshiba Corp Mask for x-ray exposure
JPS63213814A (en) * 1987-03-02 1988-09-06 Nikon Corp Liquid crystal display device for stereoscopical display
JPH04133018A (en) * 1990-09-25 1992-05-07 Matsushita Electric Ind Co Ltd Spectacles for stereoscopic videos
JP3007426B2 (en) * 1991-01-24 2000-02-07 川崎重工業株式会社 Double image projection method
JPH04313146A (en) * 1991-04-05 1992-11-05 Omron Corp Automatic lending system
JPH04355716A (en) * 1991-06-04 1992-12-09 Fujitsu Ltd Liquid crystal display device and signal input method
JPH05173126A (en) * 1991-12-25 1993-07-13 Sony Corp Liquid crystal display device
JP3718908B2 (en) * 1996-07-02 2005-11-24 ソニー株式会社 Video projection system and polarized glasses

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6359296A (en) * 1986-08-29 1988-03-15 Seiko Epson Corp Stereoscopic liquid crystal television
JPS63182991A (en) * 1987-01-26 1988-07-28 Hitachi Ltd Stereoscopic television receiver
JPS63274918A (en) * 1987-05-06 1988-11-11 Jeco Co Ltd Liquid crystal stereoscopic display device
JPH04156419A (en) * 1990-10-19 1992-05-28 Natl Aerospace Lab Two-image simultaneous display panel
JPH05313146A (en) * 1992-05-15 1993-11-26 Fujitsu Ltd Liquid crystal display device

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010525393A (en) * 2007-04-20 2010-07-22 スタンニー スリーディー，リミテッド ライアビリティー カンパニー Method for viewing stereoscopic video with maximum resolution in each direction and device implementing the method
KR101522551B1 (en) * 2008-01-30 2015-05-26 삼성전자주식회사 Stereoscopic image system
WO2010142632A1 (en) * 2009-06-08 2010-12-16 Visumotion Gmbh Method for the two-dimensional perception of stereoscopic images
WO2011058784A1 (en) * 2009-11-13 2011-05-19 シャープ株式会社 Three-dimensional video recognition system, video display device and active shutter glasses
US8619205B2 (en) 2009-11-13 2013-12-31 Sharp Kabushiki Kaisha Three-dimensional video recognition system, video display device and active shutter glasses
JP5580331B2 (en) * 2009-11-13 2014-08-27 シャープ株式会社 Stereoscopic image recognition system, video display device, and active shutter glasses
JP2012189687A (en) * 2011-03-09 2012-10-04 Fujifilm Corp Three dimensional display device, and three dimensional display system of time division system
JP2015118191A (en) * 2013-12-17 2015-06-25 富士通株式会社 Information display system, information display device, and spectacles
CN104796686A (en) * 2015-04-07 2015-07-22 上海交通大学 Safety information display system and safety information display method based on spatial-domain psycho-visual modulation

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