WO2018012331A1 - Dispositif d'affichage - Google Patents

Dispositif d'affichage Download PDF

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Publication number
WO2018012331A1
WO2018012331A1 PCT/JP2017/024294 JP2017024294W WO2018012331A1 WO 2018012331 A1 WO2018012331 A1 WO 2018012331A1 JP 2017024294 W JP2017024294 W JP 2017024294W WO 2018012331 A1 WO2018012331 A1 WO 2018012331A1
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WO
WIPO (PCT)
Prior art keywords
pattern
image
panel
display device
screen
Prior art date
Application number
PCT/JP2017/024294
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English (en)
Japanese (ja)
Inventor
笠原　滋雄
Original Assignee
パナソニックＩｐマネジメント株式会社
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
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Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Priority to JP2018527517A priority Critical patent/JPWO2018012331A1/ja
Publication of WO2018012331A1 publication Critical patent/WO2018012331A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals

Definitions

  • the present disclosure relates to a display device that displays an image.
  • a DFD (depth fused 3D) display device As a display device that displays an image, a DFD (depth fused 3D) display device is known.
  • a DFD (depth fused 3D) display device In this type of display device, two transparent LCD (Liquid Crystal Display) panels are overlaid at an interval. By changing the luminance ratio of the images displayed on each LCD panel, it is possible to display a stereoscopic image using an illusion phenomenon in which two images are merged and look like one image.
  • Patent Document 1 discloses a technique in which a dedicated optical panel for limiting the viewing angle at which information can be seen is incorporated in the structure of the display device.
  • This disclosure provides a display device that can limit the viewing angle at which information can be viewed with a simple structure.
  • a display device includes a front panel, a back panel disposed on the back side of the front panel at a distance from the front panel, and a control unit that controls display contents of each of the front panel and the back panel.
  • the control unit displays an information pattern on the rear panel, displays a first pattern for allowing the user to visually recognize the information pattern in a region overlapping the information pattern on the front panel when the front panel is viewed in plan, When the panel is viewed in plan, a second pattern for preventing the user from visually recognizing the information pattern is displayed in an area that does not overlap with the information pattern on the front panel.
  • the display device can limit the viewing angle at which information can be viewed with a simple structure.
  • FIG. 1 is a perspective view illustrating a schematic configuration of the display device according to the first embodiment.
  • FIG. 2 is a block diagram for explaining an electrical configuration of the display device according to the first embodiment.
  • FIG. 3 is a plan view showing a front image and a rear image displayed by the display device according to the first embodiment.
  • FIG. 4 is a schematic cross-sectional view of the display device according to Embodiment 1 when the screen is viewed from the front.
  • FIG. 5 is a schematic cross-sectional view of the display device according to Embodiment 1 when the screen is viewed obliquely.
  • FIG. 6 is a plan view showing a composite image displayed by the display device according to the first embodiment.
  • FIG. 7 is a diagram for explaining the principle that a composite image is displayed on the screen from the viewpoint of pixel luminance when each of the front panel and the rear panel is a TN liquid crystal display panel.
  • FIG. 8 is a diagram for explaining the principle that a composite image is displayed on the screen when the screen is viewed from the front.
  • FIG. 9 is a diagram for explaining the principle that a composite image is displayed on the screen when the screen is viewed obliquely from the right.
  • FIG. 10 is a diagram for explaining the principle that a composite image is displayed on the screen when the screen is viewed obliquely from the left.
  • FIG. 8 is a diagram for explaining the principle that a composite image is displayed on the screen when the screen is viewed from the front.
  • FIG. 9 is a diagram for explaining the principle that a composite image is displayed on the screen when the screen is viewed obliquely from the right.
  • FIG. 10 is a diagram for explaining the principle that a composite image is displayed on the screen when the
  • FIG. 11 is a diagram showing the relationship between the luminance of each pixel on the front panel and the rear panel and their combined luminance when each of the front panel and the rear panel is an IPS liquid crystal display panel.
  • FIG. 12 is a diagram for explaining the principle that a composite image is displayed on the screen when the screen is viewed from the front.
  • FIG. 13 is a diagram for explaining the principle that a composite image is displayed on the screen when the screen is viewed obliquely from the right.
  • FIG. 14 is a diagram for explaining the principle that a composite image is displayed on the screen when the screen is viewed obliquely from the left.
  • FIG. 15 is a plan view showing a dummy pattern according to a modification of the first embodiment.
  • FIG. 12 is a diagram for explaining the principle that a composite image is displayed on the screen when the screen is viewed from the front.
  • FIG. 13 is a diagram for explaining the principle that a composite image is displayed on the screen when the screen is viewed obliquely from
  • FIG. 16 is a plan view showing a front image and a rear image displayed by the display device according to the second embodiment.
  • FIG. 17 is a plan view showing a composite image displayed by the display device according to the second embodiment.
  • FIG. 18 is a plan view showing a dummy pattern according to the third embodiment.
  • FIG. 19 is a plan view showing a dummy pattern according to a modification of the third embodiment.
  • FIG. 20 is a plan view showing a dummy pattern according to the fourth embodiment.
  • FIG. 1 is a perspective view showing a schematic configuration of a display device 2 according to the first embodiment.
  • the display device 2 is, for example, a DFD type liquid crystal display device and is mounted on a device such as an ATM. As shown in FIG. 1, the display device 2 includes a front polarizing plate 4, a front panel 6, a back panel 8, a back polarizing plate 10, and a backlight 12.
  • the front polarizing plate 4, the front panel 6, the rear panel 8, the rear polarizing plate 10 and the backlight 12 are overlapped in this order from the front side to the back side as viewed from the user 14 (from the positive side of the Y axis to the negative side). And arranged substantially parallel to each other.
  • the front polarizing plate 4, the front panel 6, the rear panel 8, and the rear polarizing plate 10 constitute a screen on which an image is displayed. The screen is arranged substantially perpendicular to the Y axis.
  • Each of the front panel 6 and the rear panel 8 is a liquid crystal display panel that transmits visible light. More specifically, each of the front panel 6 and the back panel 8 is, for example, a twisted nematic (TN) type liquid crystal display panel in which the alignment direction of liquid crystal molecules is twisted by 90 °.
  • the back panel 8 is disposed on the back side of the front panel 6 (the side far from the user 14) with a space W (for example, about several mm) from the front panel 6.
  • each of the front panel 6 and the back panel 8 is not limited to a twisted nematic liquid crystal display panel.
  • an in-plane switching (IPS) liquid crystal display panel or a vertical alignment liquid crystal is used. It may be a display panel, a blue phase liquid crystal display panel, a ferroelectric liquid crystal display panel, an OCB (Optically Compensated Bend) type liquid crystal display panel, or a guest-host type liquid crystal display panel. Or you may comprise the front panel 6 and the back panel 8 combining suitably two types of liquid crystal display panels from the above.
  • the front polarizing plate 4 is disposed on the front side of the front panel 6 (side closer to the user 14).
  • the front polarizing plate 4 has a first transmission axis 16 that indicates the polarization direction of light transmitted through the front polarizing plate 4. That is, the front polarizing plate 4 transmits only light having a polarization direction substantially parallel to the first transmission axis 16 among light incident on the front polarizing plate 4 from the front panel 6.
  • the direction of the first transmission axis 16 is, for example, the X-axis direction in FIG.
  • the back polarizing plate 10 is disposed on the back side of the back panel 8 (the side far from the user 14).
  • the rear polarizing plate 10 has a second transmission axis 18 that indicates the polarization direction of light transmitted through the rear polarizing plate 10. That is, the rear polarizing plate 10 transmits only light having a polarization direction substantially parallel to the second transmission axis 18 among the light incident on the rear polarizing plate 10 from the backlight 12.
  • the direction of the second transmission axis 18 is a direction substantially perpendicular to the first transmission axis 16, for example, the Z-axis direction in FIG.
  • the backlight 12 is disposed on the back side of the back polarizing plate 10 (the side far from the user 14).
  • the backlight 12 irradiates light toward the back surface of the back polarizing plate 10. Note that light from the backlight 12 includes light of any polarization direction.
  • FIG. 2 is a block diagram for explaining an electrical configuration of the display device 2 according to the first embodiment.
  • the display device 2 includes a front panel 6, a back panel 8, a backlight 12, and a control circuit board 20 (an example of a control unit) as an electrical configuration.
  • the front panel 6 includes a liquid crystal display unit 22, a scanning line driving circuit 24, and a video line driving circuit 26.
  • a plurality of scanning lines 28 extending from the scanning line driving circuit 24 and a plurality of video lines 30 extending from the video line driving circuit 26 are arranged.
  • the rear panel 8 includes a liquid crystal display unit 32, a scanning line driving circuit 34, and a video line driving circuit 36.
  • a plurality of scanning lines 38 extending from the scanning line driving circuit 34 and a plurality of video lines 40 extending from the video line driving circuit 36 are arranged.
  • the backlight 12 includes an LED (Light Emitting Diode) light source 42 and a light guide plate 44 that guides light from the LED light source 42 to the back surface of the back polarizing plate 10.
  • the arrangement of the LED light source 42 of the backlight 12 may be a direct type or an edge type.
  • the backlight 12 may further include a diffusion plate for uniformly diffusing light from the light guide plate 44.
  • the control circuit board 20 is electrically connected to each of the front panel 6, the back panel 8, and the backlight 12.
  • the control circuit board 20 supplies power, control signals, and the like to the front panel 6, the back panel 8, and the backlight 12.
  • the control circuit board 20 includes a backlight control circuit 46, an AC / DC converter 48, a front image control circuit 50, and a back image control circuit 52.
  • the backlight control circuit 46 controls the light emission of the LED light source 42 of the backlight 12 based on AC power supplied from a commercial power source.
  • AC / DC converter 48 converts AC power supplied from a commercial power source into DC power, and supplies the converted DC power to each of front panel 6 and rear panel 8.
  • the front image control circuit 50 generates a timing signal, a gradation voltage, a common voltage, and the like based on the front image signal acquired from the outside of the control circuit board 20 and supplies them to the front panel 6. Accordingly, the front panel 6 drives the scanning line driving circuit 24 and the video line driving circuit 26 to operate the scanning line 28 and the video line 30. As a result, the front panel 6 displays an image (hereinafter referred to as “front image”) based on light emitted from the backlight 12 by controlling the alignment direction of the liquid crystal molecules of the liquid crystal display unit 22.
  • the rear image control circuit 52 generates a timing signal, a gradation voltage, a common voltage, and the like based on the rear image signal acquired from the outside of the control circuit board 20 and supplies them to the rear panel 8.
  • the back panel 8 drives the scanning line driving circuit 34 and the video line driving circuit 36 to operate the scanning line 38 and the video line 40.
  • the back panel 8 displays an image (hereinafter referred to as “back image”) based on the light emitted from the backlight 12 by controlling the alignment direction of the liquid crystal molecules of the liquid crystal display unit 32.
  • the display device 2 according to Embodiment 1 can be used as a 3D display or a privacy display.
  • the 3D display is a display that displays a stereoscopic image to the user 14.
  • the front image signal and the back image signal have the same content in the front image and the back image, but have different luminance. That is, the same content image is displayed on the front panel 6 and the back panel 8 with different luminances.
  • the front image displayed on the front panel 6 and the rear image displayed on the back panel 8 are merged to display a stereoscopic image using an illusion phenomenon that appears as one image.
  • the privacy display is a display that limits the viewing angle at which the information pattern 58 (described later) can be seen. That is, the user 14 can visually recognize the information pattern 58 when viewing the screen from the front (when the direction of the line of sight is substantially parallel to the Y axis), but when viewing the screen from an oblique direction (the direction of the line of sight). Is inclined with respect to the Y axis), the information pattern 58 cannot be visually recognized.
  • a front image first pattern 54 and second pattern 56 to be described later
  • a rear image information pattern to be described later
  • composite image an image obtained by combining the front image and the back image (hereinafter referred to as “composite image”) is displayed on the screen.
  • composite image an image obtained by combining the front image and the back image
  • the entire screen may function as a privacy display, or only a part of the screen may function as a privacy display.
  • the remaining part of the screen functions as a 3D display, for example.
  • FIG. 3 is a plan view showing a front image and a rear image displayed by the display device 2 according to the first embodiment.
  • FIG. 3A is a plan view showing a front image
  • FIG. 3B is a plan view showing a back image.
  • FIG. 4 is a schematic cross-sectional view of the display device 2 according to the first embodiment when the screen is viewed from the front.
  • FIG. 5 is a schematic cross-sectional view of the display device 2 according to the first embodiment when the screen is viewed obliquely.
  • FIG. 3 is a plan view showing a front image and a rear image displayed by the display device 2 according to the first embodiment.
  • FIG. 3A is a plan view showing a front image
  • FIG. 3B is a plan view showing a back image.
  • FIG. 4 is a schematic cross-sectional view of the display device 2 according to the first embodiment when the screen is viewed from the front.
  • FIG. 5 is a schematic cross-sectional view of the display device 2 according to the
  • FIG. 6 is a plan view showing a composite image displayed by the display device 2 according to the first embodiment.
  • FIG. 6A is a plan view showing a composite image when the screen is viewed from the front
  • FIG. 6B is a plan view showing the composite image when the screen is viewed from an oblique direction.
  • illustration of the back polarizing plate 10 and the backlight 12 is omitted in FIGS. 4 and 5.
  • the front image control circuit 50 displays the first pattern 54 and the second pattern 56 on the front panel 6 as a front image.
  • the first pattern 54 is a stripe-shaped pattern image for allowing the user 14 to visually recognize an information pattern 58 (described later), and is, for example, a black image (an example of an OFF image).
  • the second pattern 56 is a stripe-shaped pattern image for preventing the user 14 from visually recognizing the information pattern 58, and is, for example, a white image (an example of an ON image).
  • the first pattern 54 and the second pattern 56 are alternately arranged in a stripe shape.
  • the ON image / OFF image is an image obtained by turning on / off at least one of RGB in one pixel.
  • the ON image becomes a white image and the OFF image becomes a black image.
  • the ON image becomes a red image and the OFF image becomes a black image.
  • the ON image becomes a yellow image and the OFF image becomes a green image.
  • the rear image control circuit 52 displays an information pattern 58 and a dummy pattern 60 as a rear image.
  • the information pattern 58 is, for example, a pattern image in which the shape representing the number “3” is arranged in a stripe shape, for example, a white image.
  • the information pattern 58 represents information such as a key top of a numeric keypad or a personal identification number displayed on a screen such as an ATM.
  • the dummy pattern 60 is a stripe-shaped pattern image, and its width and arrangement interval in the X-axis direction are uniform. That is, the information pattern 58 and the dummy pattern 60 are alternately arranged in a stripe shape.
  • the portion of the back image other than the information pattern 58 and the dummy pattern 60 is a base image.
  • the first pattern 54 overlaps with the information pattern 58 of the front panel 6 and the dummy of the front panel 6. It is displayed in an area that does not overlap the pattern 60.
  • the second pattern 56 is displayed in an area that overlaps the dummy pattern 60 of the front panel 6 and does not overlap the information pattern 58 of the front panel 6.
  • the light from the information pattern 58 passes through the first pattern 54 and the front polarizing plate 4. More specifically, since the information pattern 58 is a white image (all RGB in one pixel are ON), as shown in FIG. 1, the polarization of light incident on the information pattern 58 of the rear panel 8 from the rear polarizing plate 10. The direction is rotated (rotated) by 90 ° from the direction of the second transmission axis 18 (Z-axis direction) by the liquid crystal molecules of the information pattern 58.
  • the first pattern 54 is a black image (RGB in one pixel is all OFF)
  • the first pattern 54 is incident on the first pattern 54 of the front panel 6 from the information pattern 58 of the rear panel 8 as shown in FIG.
  • the polarization direction of the light is maintained as it is by the liquid crystal molecules of the first pattern 54.
  • the polarization direction of the light incident on the front polarizing plate 4 from the first pattern 54 of the front panel 6 is substantially parallel to the first transmission axis 16.
  • light from the information pattern 58 is transmitted through each of the first pattern 54 and the front polarizing plate 4.
  • the composite image is an image in which the information pattern 58 and the second pattern 56 are alternately arranged in a stripe shape. It becomes. Thereby, the user 14 can visually recognize the information pattern 58. As a result, for example, the user 14 standing in front of the ATM screen can view information such as the key top of the numeric keypad or the personal identification number displayed on the screen.
  • the light from the information pattern 58 passes through the second pattern 56 but does not pass through the front polarizing plate 4. More specifically, since the second pattern 56 is a white image (RGB in one pixel is all ON), the second pattern 56 on the front panel 6 is changed from the information pattern 58 on the rear panel 8 as shown in FIG. The polarization direction of the light incident on 56 is rotated (rotated) by 90 ° from the direction of the first transmission axis 16 by the liquid crystal molecules of the second pattern 56. Thereby, the polarization direction of the light incident on the front polarizing plate 4 from the second pattern 56 of the front panel 6 becomes substantially perpendicular to the first transmission axis 16. As a result, light from the information pattern 58 passes through the second pattern 56 but does not pass through the front polarizing plate 4.
  • the second pattern 56 is a white image (RGB in one pixel is all ON)
  • the polarization direction of the light incident on 56 is rotated (rotated) by 90 ° from the direction of the first transmission axis 16 by the
  • the composite image is an image in which the dummy patterns 60 and the second patterns 56 are alternately arranged in stripes. It becomes. Thereby, the user 14 cannot visually recognize the information pattern 58. As a result, for example, a third party standing diagonally behind the ATM screen cannot peek at information such as the key top of the numeric keypad or the personal identification number displayed on the screen.
  • the information pattern 58 and the dummy pattern 60 may be the same color.
  • the angle at which the screen is viewed obliquely deviates from an angle at which the information pattern 58 cannot be viewed
  • light from a part of the information pattern 58 is transmitted through the front polarizing plate 4, but one of the dummy patterns 60.
  • the light from the part also passes through the front polarizing plate 4.
  • a part of the information pattern 58 of the same color and a part of the dummy pattern 60 appear to be connected, so that it is difficult for a third party to visually recognize the information pattern 58.
  • each of the front panel 6 and the rear panel 8 is a TN type liquid crystal display panel
  • the principle that the composite image is displayed on the screen from the viewpoint of the luminance of the pixel. Will be described.
  • FIG. 7 is a diagram for explaining the principle that a composite image is displayed on the screen from the viewpoint of pixel luminance when each of the front panel 6 and the rear panel 8 is a TN liquid crystal display panel.
  • FIG. 7A is a table showing the relationship between the luminance of each pixel of the front panel 6 and the rear panel 8 and their combined luminance
  • FIG. 7B shows the relationship between the optical rotation angle and the luminance of the pixel. It is a graph which shows a relationship.
  • FIG. 8 is a diagram for explaining the principle that a composite image is displayed on the screen when the screen is viewed from the front.
  • FIG. 8A is a diagram illustrating a front image when the screen is viewed from the front
  • FIG. 8B is a diagram illustrating a rear image when the screen is viewed from the front.
  • (C) is a figure which shows a synthesized image when the screen is viewed from the front.
  • FIG. 9 is a diagram for explaining the principle that a composite image is displayed on the screen when the screen is viewed obliquely from the right.
  • FIG. 9A is a diagram showing a front image when the screen is viewed from an oblique right side
  • FIG. 9B is a diagram showing a rear image when the screen is viewed from an oblique right side.
  • FIG. 9C is a diagram showing a composite image when the screen is viewed obliquely from the right side.
  • FIG. 10 is a diagram for explaining the principle that a composite image is displayed on the screen when the screen is viewed obliquely from the left.
  • FIG. 10A is a diagram illustrating a front image when the screen is viewed from an oblique left side
  • FIG. 10B is a diagram illustrating a rear image when the screen is viewed from an oblique left side.
  • FIG. 10C shows a composite image when the screen is viewed obliquely from the left.
  • the luminance of the black pixel is “0” and the luminance of the white pixel is “1”.
  • the polarization direction of the light transmitted through the pixel with luminance “0” is rotated (rotated) by 0 °.
  • the polarization direction of the light transmitted through the pixel having luminance “1” is rotated (rotated) by 90 °.
  • the optical rotation angle of the light from the front panel 6 is 90 ° as indicated by a point B or a point B ′ in FIG.
  • FIG. 8A in the front image, the left end (second row of the front image) to the right end (eighth column of the front image) of the area of interest (indicated by a thick frame in FIG. 8A).
  • the pixels are alternately arranged with luminance values “0”, “1”, “0”, “1”,.
  • the luminance of the pixel corresponding to the first pattern 54 is set to “0” in the front image.
  • FIG. 8B in the rear image, from the left end (third column of the rear image) to the right end (9 columns of the rear image) of the area of interest (indicated by a thick frame in FIG. 8B). Pixels) are arranged alternately with luminance “1”, “0”, “1”, “0”,. Further, as shown by the mesh pattern in FIG. 8B, in the rear image, for example, the luminance of the pixel corresponding to the information pattern 58 representing the number “3” is set to “0”.
  • FIGS. 9A and 9B when the screen is viewed from the right side, the second row of the front image and the fourth row of the back image overlap.
  • FIG. 9C in the synthesized image, pixels with luminance “1” are scattered among pixels with luminance “0”, but the black number “3” is visually recognized. I can't.
  • FIGS. 10A and 10B when the screen is viewed from the left side, the second row of the front image and the second row of the back image overlap.
  • FIG. 10C in the synthesized image, pixels with luminance “1” are scattered among pixels with luminance “0”, but the black number “3” is visually recognized. I can't.
  • the present invention is not limited to this.
  • the direction and the direction of the second transmission axis 18 may be substantially parallel.
  • the relationship between the optical rotation angle and the luminance of the pixel is opposite to the relationship shown in FIG. That is, the luminance is “1” when the optical rotation angle is 0 ° or 180 °, and the luminance is “0” when the optical rotation angle is 90 °.
  • each of the front panel 6 and the rear panel 8 is an IPS liquid crystal display panel
  • the principle that the composite image is displayed on the screen from the viewpoint of the luminance of the pixels. Will be described.
  • the luminance of the black pixel is “0”
  • the luminance of the white pixel is “1”.
  • FIG. 11 is a diagram showing the relationship between the luminance of each pixel of the front panel 6 and the rear panel 8 and their combined luminance when each of the front panel 6 and the rear panel 8 is an IPS liquid crystal display panel. .
  • FIG. 12 is a diagram for explaining the principle that a composite image is displayed on the screen when the screen is viewed from the front.
  • 12A is a diagram illustrating a front image when the screen is viewed from the front
  • FIG. 12B is a diagram illustrating a rear image when the screen is viewed from the front.
  • C is a figure which shows a synthesized image when the screen is viewed from the front.
  • FIG. 13 is a diagram for explaining the principle that a composite image is displayed on the screen when the screen is viewed obliquely from the right.
  • FIG. 13A is a diagram showing a front image when the screen is viewed obliquely from the right side
  • FIG. 13B is a diagram showing a rear image when the screen is viewed from the diagonal right side
  • FIG. 13C is a diagram showing a composite image when the screen is viewed obliquely from the right side.
  • FIG. 14 is a diagram for explaining the principle that a composite image is displayed on the screen when the screen is viewed obliquely from the left.
  • FIG. 14A is a diagram showing a front image when the screen is viewed from an oblique left side
  • FIG. 14B is a diagram showing a rear image when the screen is viewed from an oblique left side.
  • FIG. 14C shows a composite image when the screen is viewed obliquely from the left.
  • an IPS liquid crystal display panel utilizes the birefringence of liquid crystal.
  • the emitted light has the same polarization plane as that of the incident light without changing the direction of the polarization plane, so that black display is obtained.
  • the emitted light becomes elliptically polarized light that maximizes the luminance in the direction orthogonal to the polarization plane of the incident light.
  • the white display (pixel brightness “1”) is obtained.
  • the luminance of the pixel corresponding to the first pattern 54 is set to “0” in the front image.
  • the luminance of the pixel corresponding to the information pattern 58 representing the number “3” is set to “0”.
  • FIGS. 13A and 13B when the screen is viewed from the right side, the second row of the front image and the fourth row of the back image overlap.
  • FIG. 13C in the composite image, pixels with luminance “0” are scattered among pixels with luminance “1”, but the black number “3” is visually recognized. I can't.
  • FIGS. 14A and 14B when the screen is viewed from the left side, the second row of the front image and the second row of the back image overlap.
  • FIG. 14C in the synthesized image, pixels with luminance “0” are scattered among pixels with luminance “1”, but the black number “3” is visually recognized. I can't.
  • the display device 2 includes the front panel 6, the rear panel 8 disposed at a distance from the front panel 6 on the back side of the front panel 6, the front panel 6, and the rear panel. 8 is provided with a control circuit board 20 for controlling the display contents of each of the eight.
  • the control circuit board 20 displays the information pattern 58 on the back panel 8.
  • the control circuit board 20 displays a first pattern 54 for allowing the user 14 to visually recognize the information pattern 58 in a region overlapping the information pattern 58 of the front panel 6 when the front panel 6 is viewed in plan.
  • the control circuit board 20 displays a second pattern 56 for preventing the user 14 from visually recognizing the information pattern 58 in a region that does not overlap the information pattern 58 of the front panel 6 when the front panel 6 is viewed in plan.
  • the user 14 can visually recognize the information pattern 58 by the first pattern 54 when the screen is viewed from the front.
  • the user 14 cannot visually recognize the information pattern 58 by the second pattern 56 when the screen is viewed obliquely.
  • the viewing angle at which the information pattern 58 can be viewed can be limited. Therefore, the viewing angle can be limited with a simple structure without incorporating, for example, a dedicated optical component for limiting the viewing angle into the structure of the display device 2.
  • the display device 2 has a first transmission axis 16, a front polarizing plate 4 disposed on the front side of the front panel 6, and a second transmission axis 18, on the back side of the back panel 8.
  • the rear polarizing plate 10 is provided.
  • the control circuit board 20 displays the first pattern 54 so that the polarization direction of the light transmitted from the information pattern 58 that has passed through the first pattern 54 is substantially parallel to the first transmission axis 16.
  • the control circuit board 20 displays the second pattern 56 so that the polarization direction of the light transmitted through the second pattern 56 out of the light from the information pattern 58 is substantially perpendicular to the first transmission axis 16. .
  • the light from the information pattern 58 is transmitted through the first pattern 54, so that the light can be transmitted to the front polarizing plate 4. Further, when the screen is viewed from an oblique direction, the light from the information pattern 58 is transmitted through the second pattern 56 so that the light is not transmitted to the front polarizing plate 4.
  • each of the front panel 6 and the back panel 8 is a twisted nematic liquid crystal display panel in which the alignment direction of liquid crystal molecules is twisted by 90 °.
  • the control circuit board 20 displays an OFF image as the first pattern 54 and displays an ON image as the second pattern 56.
  • the light from the information pattern 58 is transmitted through the first pattern 54, so that the light can be transmitted to the front polarizing plate 4. Further, when the screen is viewed from an oblique direction, the light from the information pattern 58 is transmitted through the second pattern 56 so that the light is not transmitted to the front polarizing plate 4.
  • control circuit board 20 displays the dummy pattern 60 in a region overlapping the second pattern 56 of the rear panel 8 when the front panel 6 is viewed in plan.
  • the dummy pattern 60 is displayed on the screen, so that it is difficult to guess what information is displayed as the information pattern 58 on the screen.
  • the dummy patterns 60 are arranged in a stripe shape.
  • the stripe-shaped dummy pattern 60 is displayed on the screen, so that it is more difficult to guess what information is displayed as the information pattern 58 on the screen. Can do.
  • the dummy pattern 60 is the same color as the information pattern 58.
  • FIG. 15 is a plan view showing a dummy pattern 60A according to a modification of the first embodiment.
  • the dummy pattern 60A is a stripe-shaped pattern image. Further, the width and the arrangement interval in the X-axis direction of the dummy pattern 60A are random (non-uniform).
  • the angle at which the screen is viewed obliquely deviates by a certain angle from the angle at which the information pattern 58 (see FIG. 3) cannot be viewed. Every time the information pattern 58 and the first pattern 54 overlap, there is a possibility that a third party can visually recognize the information pattern 58.
  • the angle at which the information pattern 58 and the first pattern 54 overlap when the screen is viewed obliquely is the first. It depends on the position of the pattern 54. For this reason, even if the angle at which the screen is viewed from an oblique direction is deviated from an angle at which the information pattern 58 cannot be viewed, the information pattern 58 and the first pattern 54 are difficult to overlap, and the information pattern 58 is difficult to view. can do.
  • Embodiment 2 Next, Embodiment 2 will be described with reference to FIGS. 16 and 17.
  • FIG. 16 is a plan view showing a front image and a rear image displayed by the display device according to the second embodiment.
  • FIG. 16A is a plan view showing the front image
  • FIG. 16B is a plan view showing the back image.
  • FIG. 17 is a plan view showing a composite image displayed by the display device according to the second embodiment.
  • FIG. 17A is a plan view showing a composite image when the screen is viewed from the front
  • FIG. 17B is a plan view showing the composite image when the screen is viewed from an oblique direction.
  • the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
  • the shapes of the front image and the rear image are different from those of the first embodiment.
  • the front image control circuit 50 displays the first pattern 54B and the second pattern 56B on the front panel 6 (see FIG. 1) as a front image.
  • the first pattern 54B is a pattern image (a so-called check pattern) in which quadrilaterals are arranged in a staggered pattern, for example, a black image.
  • the second pattern 56B is a pattern image in which quadrangles are arranged in a staggered pattern, and is, for example, a white image.
  • the first pattern 54B and the second pattern 56B are alternately arranged in a staggered pattern.
  • the back image control circuit 52 displays the information pattern 58B and the dummy pattern 60B as the back image.
  • the information pattern 58B is a pattern image in which, for example, the shape representing the number “3” is arranged in a staggered pattern, for example, a white image.
  • the dummy pattern 60B is a pattern image in which squares are arranged in a staggered pattern.
  • the information patterns 58B and the dummy patterns 60B are alternately arranged in a staggered pattern.
  • the information pattern 58B and the dummy pattern 60B are the same color.
  • the composite image is an image in which the information patterns 58B and the second patterns 56B are alternately arranged in a staggered manner.
  • the user 14 (refer FIG. 1) can visually recognize the information pattern 58B.
  • the composite image is an image in which the dummy patterns 60B and the second patterns 56B are alternately arranged in a staggered manner. Thereby, the user 14 cannot visually recognize the information pattern 58B.
  • the dummy patterns 60B are arranged in a staggered manner.
  • Embodiment 3 Next, Embodiment 3 will be described with reference to FIG.
  • FIG. 18 is a plan view showing a dummy pattern 60C according to the third embodiment.
  • the shape and arrangement of the dummy pattern 60C are different from those in the first embodiment.
  • the dummy pattern 60C is a pattern image in which circles are arranged in a lattice pattern.
  • the size and arrangement interval of the dummy patterns 60C are uniform.
  • the dummy pattern 60C has a circular shape.
  • a portion other than a circle may be a dummy pattern. The same applies to the modifications shown below.
  • FIG. 19 is a plan view showing dummy patterns 60D, 60E, and 60F according to a modification of the third embodiment.
  • the dummy pattern 60D is a pattern image in which circular shapes are arranged in a staggered manner, and the arrangement interval is uniform.
  • the dummy pattern 60E is a pattern image having a circular shape. Further, the arrangement interval of the dummy patterns 60E is random.
  • the dummy pattern 60F is a pattern image having a circular shape. Further, the size and arrangement interval of the dummy patterns 60F are random.
  • the direction in which the dummy patterns 60E and 60F are randomly arranged may be, for example, at least one of a horizontal direction (X-axis direction) and a vertical direction (Z-axis direction).
  • Embodiment 4 will be described with reference to FIG.
  • FIG. 16 is a plan view showing a dummy pattern 60G according to the fourth embodiment.
  • the shape and arrangement of the dummy pattern 60G are different from those of the first embodiment.
  • the dummy pattern 60G is a pattern image in which indefinite shapes (for example, cocoon shapes) are arranged in a staggered pattern.
  • the size of the dummy pattern 60G is uniform, and the arrangement interval is random.
  • dummy pattern 60G has an indefinite shape.
  • the display device 2 is mounted on an ATM, but the present invention is not limited to this.
  • the display device 2 may be mounted on a personal computer liquid crystal display, a smartphone, a tablet terminal, or the like.
  • the display device 2 is a liquid crystal display method, but is not limited to this, and may be, for example, an EL (Electro Luminescence) display method or an EC (Electrochromic) display method.
  • the display device 2 is a guest-host type liquid crystal method, EL method, or EC method
  • the front polarizing plate 4 and the rear polarizing plate 10 can be omitted.
  • the backlight 12 can also be omitted.
  • the dummy pattern 60B is a pattern image in which quadrilaterals are arranged in a staggered pattern, but is not limited thereto, and may be a pattern image in which polygons such as pentagons are arranged in a staggered pattern. .
  • the dummy pattern 60C is a pattern image in which circles are arranged in a grid pattern.
  • the present invention is not limited to this.
  • a pattern image in which polygons such as pentagons are arranged in a grid pattern is used. Also good.
  • a single type of dummy pattern is arranged, but a plurality of types of dummy patterns may be combined.
  • a circular dummy pattern and an irregular dummy pattern may be combined.
  • the present disclosure is applicable to a display device that displays an image. Specifically, the present disclosure is applicable to, for example, a DFD display device.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

Un dispositif d'affichage (2) comporte : un panneau de surface avant (6); un panneau de surface arrière (8) disposé sur le côté de surface arrière du panneau de surface avant (6) avec un espace entre celui-ci et le panneau de surface avant (6); et une carte de circuit de commande (20) pour commander divers contenus d'affichage pour le panneau de surface avant (6) et le panneau de surface arrière (8). La carte de circuit imprimé de commande (20) affiche un motif d'informations (58) sur le panneau de surface arrière (8), affiche, dans une vue en plan du panneau de surface avant (6), un premier motif (54) pour rendre le motif d'informations (58) visible par un utilisateur (14) dans une région du panneau de surface avant (6) qui chevauche le motif d'informations (58) et affiche, dans une vue en plan du panneau de surface avant (6), un second motif (56) pour ne pas rendre le motif d'informations (58) visible par l'utilisateur (14) dans une région du panneau de surface avant (6) ne chevauchant pas le motif d'informations (58).
PCT/JP2017/024294 2016-07-12 2017-07-03 Dispositif d'affichage WO2018012331A1 (fr)

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
JPWO2018011831A1 (ja) * 2016-07-14 2019-06-27 パナソニック液晶ディスプレイ株式会社 表示装置
JP2020154319A (ja) * 2016-07-14 2020-09-24 パナソニック液晶ディスプレイ株式会社 表示装置
WO2021166352A1 (fr) * 2020-02-17 2021-08-26 シャープ株式会社 Unité d'affichage, dispositif d'affichage, procédé de commande de dispositif d'affichage et programme de commande
WO2022009466A1 (fr) * 2020-07-06 2022-01-13 パナソニックＩｐマネジメント株式会社 Dispositif et procédé d'affichage

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JPS63174329U (fr) * 1987-04-14 1988-11-11
JP2005107306A (ja) * 2003-09-30 2005-04-21 Sharp Corp 液晶表示構造体
JP2011203683A (ja) * 2010-03-26 2011-10-13 Fujitsu Ltd 表示制御装置、表示制御プログラム及び表示制御方法
WO2017018332A1 (fr) * 2015-07-29 2017-02-02 シャープ株式会社 Dispositif d'affichage d'image

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CN102187385B (zh) * 2008-10-20 2014-03-12 日本电气株式会社 图像显示系统、图像控制装置、图像控制方法以及光学快门

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Publication number Priority date Publication date Assignee Title
JPS63174329U (fr) * 1987-04-14 1988-11-11
JP2005107306A (ja) * 2003-09-30 2005-04-21 Sharp Corp 液晶表示構造体
JP2011203683A (ja) * 2010-03-26 2011-10-13 Fujitsu Ltd 表示制御装置、表示制御プログラム及び表示制御方法
WO2017018332A1 (fr) * 2015-07-29 2017-02-02 シャープ株式会社 Dispositif d'affichage d'image

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2018011831A1 (ja) * 2016-07-14 2019-06-27 パナソニック液晶ディスプレイ株式会社 表示装置
JP2020154319A (ja) * 2016-07-14 2020-09-24 パナソニック液晶ディスプレイ株式会社 表示装置
WO2021166352A1 (fr) * 2020-02-17 2021-08-26 シャープ株式会社 Unité d'affichage, dispositif d'affichage, procédé de commande de dispositif d'affichage et programme de commande
WO2022009466A1 (fr) * 2020-07-06 2022-01-13 パナソニックＩｐマネジメント株式会社 Dispositif et procédé d'affichage

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