JP2009169148A - Display system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To conceal display contents for the third person looking in a screen from the rear while maintaining visibility. <P>SOLUTION: A display system 100 includes: a display device 10 including a non-polarization area and a polarization area 12b, which displays a camouflage image at a position corresponding to the polarization area 12b; and a pair of polarization glasses 20 for filtering light from the polarization area 12b. The display device 10 includes: a display element 11 for combining and displaying the camouflage image 2 and an original image 1 displayed at a position corresponding to the non-polarization area; and a polarization panel 12 including a hole 12a corresponding to the non-polarization area, which is provided at a perception side of the display device 11. A polarization axis of the polarization glasses 20 and a polarization axis of the polarization area 12b are approximately orthogonal. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display system for concealing display contents from a third party.

  In recent years, from the viewpoint of privacy and security, means have been proposed to prevent a third party from peeping at the contents displayed on the screen. Many of the conventional methods related to concealing display contents to a third party have only a viewing angle control panel attached. In such a display device, as shown in FIG. 9, there is a problem that a third party C can look into the display content from the back of the user A. Some have taken measures to narrow the viewing angle in order to reduce the visibility from a third party. However, in this case, the user's own visibility is lowered.

Patent Document 1 describes that a liquid crystal display device having a structure with different orientation directions for each pixel is viewed with glasses of a polarizing filter. In order to enable stereoscopic display, the liquid crystal display device described in Patent Document 1 displays a left-eye image and a right-eye image on each pixel, and has the same polarization plane as the output-side polarization filter layer. Using the filter glasses, the left and right images are viewed with the left and right eyes, respectively. In Patent Document 1, no consideration is given to the concealment of display contents.
JP-A-8-179702

  In this way, it is not possible to exclude a third party from looking into the display content on the screen simply by providing the viewing angle control panel. The reason is that the screen can be viewed within the range of the viewing angle of the viewing angle control panel, and it is not effective for a third party looking through the shoulder of the user from behind.

  The present invention has been made against the background of such circumstances, and an object of the present invention is to provide a display system that conceals display content from a third party who looks into the screen from behind while maintaining visibility. It is to be.

  A display system according to one embodiment of the present invention has a non-polarization region and a polarization region on a screen, displays a camouflage image at a position corresponding to the polarization region, and filters light from the polarization region A polarizing element.

  ADVANTAGE OF THE INVENTION According to this invention, the display system which can conceal a display content with respect to the third party who looks into a screen from back can be provided, maintaining visibility.

Embodiment 1 FIG.
A display system 100 according to Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing a configuration of a display system 100 according to the present embodiment. The display system 100 according to the present invention can conceal the display contents from a third party who looks into the screen from behind while maintaining the visibility to the user.

  As shown in FIG. 1, the display system 100 according to the present embodiment includes a display device 10 and polarized glasses 20. Here, although the polarizing glasses 20 are described as an example of the polarizing element, the present invention is not limited to this. The display device 10 includes a display element 11, a polarizing panel 12, and a display control device 13. The display element 11 is not particularly limited, and a liquid crystal display element, an organic EL display element, a rear projection type display element, or the like can be used.

  A polarizing panel 12 is arranged on the viewing side of the display element 11. The polarizing panel 12 is provided with holes 12a in a matrix. That is, the polarizing region 12b of the polarizing panel 12 has a lattice shape. When a liquid crystal display element is used as the display element 11, the polarization axis of the polarizing panel 12 is shifted from the polarization axis of the polarizing plate attached to the substrate on the viewing side of the liquid crystal display element.

  A display control device 13 is connected to the display element 11. The display control device 13 includes an original image drawing unit 14, a camouflage image drawing unit 15, and a display image drawing unit 16. Original image data to be displayed to the user is input to the original image drawing unit 14 from the outside. The camouflage image drawing unit 15 stores camouflage image data for concealing the original image.

  The display image drawing unit 16 synthesizes the original image data input from the original image drawing unit 14 and the camouflage image data input from the camouflage image drawing unit 15, and outputs the resultant image as display image data to the display element 11. . The display element 11 synthesizes and displays the original image and the camouflage image based on the input display image data. The camouflage image is displayed corresponding to the lattice-shaped polarization region 12b (portion other than the hole 12a) of the lattice-shaped polarization panel 12.

  The direction of the polarization axis of the polarizing glasses 20 and the direction of the polarization axis of the polarization region of the polarizing panel 12 are shifted by approximately 90 °. For example, if the angle of the polarization axis of the polarizing glasses 20 is α, the angle of the polarization axis of the lattice-like polarizing panel 12 is α + 90 °. A user can view a display image displayed on the display device 10 using polarized glasses.

  An image displayed on the display element 11 will be described with reference to FIG. The original image 1 is an image to be displayed to the user. The camouflage image 2 is for concealing the original image 1 from a third party. In the camouflage image 2, one pixel out of 2 × 2 pixels is used for displaying the original image 1. In the present embodiment, one pixel at the lower right of the 2 × 2 four pixels displays the original image 1. The other three pixels display an arbitrary color in order to conceal the original image 1. A display image 3 is generated by combining the original image 1 and the camouflage image 2. The display image 3 is displayed on the screen of the display device 10 and can be viewed by anyone. Note that when the original image 1 and the camouflage image 2 are combined, the original image 1 is less likely to be perceived by a third party so that a part of the camouflage image 2 is identical to the original image 1 in a straight line or a curved line. A portion where the colors are arranged may be provided.

  When the user views the display image obtained by combining the original image 1 and the camouflage image 2 through the polarizing glasses 20, the camouflage image mask image 4 that masks the camouflage image 2 and the original image 1 are visually recognized. . The camouflage image mask image 4 is visible only to the user wearing the polarizing glasses 20 because the polarizing axis of the polarizing panel 12 and the polarizing axis of the polarizing glasses 20 are substantially orthogonal. The camouflage image mask image 4 is generated in the same pattern as the camouflage image 2 corresponding to the polarization region 12 b of the polarization panel 12. For this reason, by using the polarized glasses 20, only the camouflage image 2 is filtered, and only the user can visually recognize the image 5 after the masking of the camouflage image.

  In this way, according to the present invention, as shown in FIG. 3, the original image can be seen only by the user A who is looking at the screen through the polarizing glasses 20. This is because a third party who does not have the polarizing glasses 20 perceives the camouflage image 2 simultaneously with the original image 1 and cannot recognize the original image 1. In this way, since the original image is not shown to a third party but is hidden by actively showing the camouflage image, the luminance of the original image does not decrease.

  In addition, it is possible to easily confirm the person who is looking through the display screen. In order to view the original image 1, the polarizing glasses 20 having a polarization axis that matches the polarization axis of the user's polarizing glasses are required. When the polarization axes coincide with each other, the other person's eyes can be seen by viewing the polarized glasses worn by a third party through the polarized glasses worn by the user. In this way, it is easy for a person who can determine whether or not the polarization axes coincide with each other by simply looking at the polarizing glasses possessed by a third party using the polarizing glasses of the user, and looking through the display screen. It becomes possible to specify.

  Note that by making the brightness of the camouflage image 2 higher than the brightness of the original image 1, the visibility of a third party having a polarizing element close to the angle of the polarization axis of the user's polarizing glasses 20 can be lowered. Thereby, the confidentiality of the original image can be further improved.

Embodiment 2. FIG.
A display system 200 according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 4 is a diagram showing a configuration of the display system 200 according to the present embodiment. The present embodiment is different from the first embodiment in that the polarization axes of the polarizing panel 12 and the polarizing glasses 20 are variable. 4, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  As shown in FIG. 4, the display system 200 according to the present embodiment includes a display device 10 and polarized glasses 20. The display device 10 includes a display element 11, a polarizing panel 12, and a display control device 13. In the present embodiment, the display control device 13 includes, in addition to the original image drawing unit 14, the camouflage image drawing unit 15, and the display image drawing unit 16 described in the first embodiment, a polarization axis pattern generation unit 17, a polarization axis. A control unit 18 and a glasses communication unit 19 are provided.

  The polarization axis pattern generation unit 17 determines the polarization axis of the polarization panel 12 and the polarization axis of the polarization glasses 20. The polarization axis pattern generation unit 17 can change the polarization axis of the polarization panel 12 and the polarization axis of the polarizing glasses 20 in multiple stages in a state of being shifted by approximately 90 °. The polarization axis control unit 18 controls the polarization axis of the polarization panel 12 to be the polarization axis determined by the polarization axis pattern generation unit 17. In addition, a control signal for controlling the polarization axis of the polarized glasses 20 is transmitted to the glasses communication unit 19 so as to be shifted by approximately 90 ° from the polarization axis of the polarization panel 12 determined by the polarization axis pattern generation unit 17.

  The glasses communication unit 19 transmits a control signal to the polarization glasses control communication unit 21 provided in the polarization glasses 20. The glasses communication unit 19 and the polarized glasses control communication unit 21 may be connected by wire or may be connected wirelessly. Based on the input control signal, the polarization axis of the polarizing glasses 20 is controlled so as to be shifted by approximately 90 ° from the polarization axis generated by the polarization axis pattern generation unit 17.

  Here, with reference to FIG. 5, the configuration of the polarizing panel 12 and the polarizing glasses 20 used in the display system 200 according to the present embodiment will be described in detail. As shown in FIG. 5, the polarizing panel 12 according to the present embodiment includes a polarizing plate 12A, a polarization axis angle adjusting unit 30A, and a transparent substrate 12B. Further, the polarizing glasses 20 include a transparent substrate 22B, a polarization axis angle adjusting unit 30B, and a polarizing plate 22A. The polarizing axis of the polarizing plate 12A and the polarizing axis of the polarizing plate 22A are shifted by approximately 90 °. That is, the polarizing axis of the polarizing plate 12A and the polarizing axis of the polarizing plate 22A are substantially orthogonal. As the transparent substrates 21B and 22B, for example, glass substrates can be used.

  Each of the polarization axis angle adjustment units 30 </ b> A and 30 </ b> B includes a plurality of liquid crystal sheets 31. FIG. 6 is a diagram illustrating a configuration of the liquid crystal sheet 31. Here, the lower side in FIG. 6 is the incident side, and the upper side is the outgoing side. As shown in FIG. 6, the liquid crystal sheet 31 has a configuration in which liquid crystal molecules 33 are sandwiched between two substrates 32a and 32b with electrodes. Alignment films 34a and 34b are provided on the liquid crystal side surfaces of both substrates 32a and 32b, respectively. These are each subjected to an alignment process so that the alignment direction of the incident-side alignment film 34a and the alignment direction of the output-side alignment film 34b are shifted by β °.

  When polarized light is transmitted through the liquid crystal sheet 31 when no voltage is applied between the electrodes of both the substrates 32a and 32b (when the power is turned off), the angle of the polarization axis is shifted by β ° with respect to the incident polarization axis. . Further, when a voltage is applied between the electrodes of both the substrates 32a and 32b (when the power is turned on), the alignment of the liquid crystal molecules 33 changes according to the applied voltage, and the polarization axis of the light transmitted through the liquid crystal sheet 31 Does not change.

  As shown in FIG. 7, the liquid crystal sheet 31 having such a configuration is arranged so that the polarization axes are shifted by β °. If the liquid crystal sheet 31a side is the incident side, the polarization axis on the incident side of the liquid crystal sheet 31b is arranged in accordance with the polarization axis on the output side of the liquid crystal sheet 31a. Similarly, the polarization axis on the incident side of the liquid crystal sheet 31c is arranged in accordance with the polarization axis on the emission side of the liquid crystal sheet 31b. By controlling ON / OFF of the liquid crystal sheet 31 arranged in this way, the angle of the polarization axis can be controlled in multiple stages.

  As shown in FIG. 5, in the present embodiment, an example in which the angle of the polarization axis of the liquid crystal sheet 31 is β = 6 ° is shown. The number of liquid crystal sheets 31 is 90 ° ÷ β °. Therefore, in this embodiment, 90 ÷ 6 = 15 sheets. Accordingly, N = 15 liquid crystal sheets 31 are provided in the polarization axis angle adjustment unit 30A of the polarization panel 12. In the polarization axis angle adjusting unit 30A, the N = 1th liquid crystal sheet 31 is disposed from the polarizing plate 12A side. The alignment axis of the alignment film on the incident side of the N = 1th liquid crystal sheet 31 is substantially coincident with the polarization axis of the polarizing plate 12A.

  In addition, M = 15 liquid crystal sheets 31 are provided in the polarization axis angle adjustment unit 30 </ b> B of the polarizing glasses 20. In the polarization axis angle adjusting unit 30B, the M = 1st liquid crystal sheet 31 is disposed from the polarizing plate 22A side. The alignment axis of the alignment film on the emission side of the M = 1st liquid crystal sheet 31 substantially coincides with the polarization axis of the polarizing plate 12A. Thereby, in this Embodiment, the angle of the polarization axis of the polarizing panel 12 and the polarizing glasses 20 can be controlled to 15 steps.

  When the number of the liquid crystal sheets 31 to which the voltages of the polarizing panel 12 and the polarizing glasses 20 are applied is the same, the polarization axis of the polarizing panel 12 and the polarizing axis of the polarizing glasses 20 can be kept in a state of being shifted by approximately 90 °. . That is, when the liquid crystal sheets 31 up to the Nth of the polarizing panel 12 are in the OFF state and the power of the N + 1th and subsequent liquid crystal sheets 31 is in the ON state, the angle of the polarization axis of the light transmitted through these liquid crystal sheets 31 is It is shifted by N × β ° with respect to the polarization axis of 12A.

  On the other hand, when the liquid crystal sheets 31 up to M (N = M) of the polarizing glasses 20 are turned off and the power of the M + 1 and subsequent liquid crystal sheets 31 is turned on, the polarization axis of the light transmitted through these liquid crystal sheets 31 is changed. The angle is shifted by M × β ° with respect to the polarization axis of the polarizing plate 22A.

  For example, as shown in FIG. 5, when N = 1 to 4th liquid crystal sheet 31 is in an OFF state and 5th to 15th liquid crystal sheet 31 is in an ON state, the angle of the polarization axis is the angle of the polarization axis of polarizing plate 12A. 4 × 6 = 24 ° off. That is, when the angle of the polarization axis of the polarizing plate 12A is 0 °, the angle of the polarization axis of the polarizing panel 12 is 0 ° + 4 × 6 = 24 °.

  When M = 1 to 4th liquid crystal sheet 31 is in the OFF state and the 5th to 15th liquid crystal sheets 31 are in the ON state, the angle of the polarization axis is 4 × 6 = 24 from the angle of the polarization axis of the polarizing plate 22A. ° Deviation. That is, when the angle of the polarization axis of the polarizing plate 22A is 90 °, the angle of the polarization axis of the polarizing glasses 20 is 90 ° + 4 × 6 = 114 °.

  Thus, when the number of the liquid crystal sheets 31 for turning on the power of the polarizing panel 12 and the polarizing glasses 20 is the same, the camouflage image can be filtered. That is, the user can visually recognize the image 5 after masking the camouflage image through the polarizing glasses 20 and can perceive the original image 1.

  Thus, by making the polarization axes of the polarizing panel 12 and the polarizing glasses 20 variable, it is possible to conceal the display contents from a third party without depending on the polarizing glasses 20 having a specific polarization axis. Therefore, as shown in FIG. 8, only the user A using the polarizing glasses 20 that matches the polarization axis direction of the polarizing panel 12 can perceive the original image. Further, by periodically changing the polarization axes of the polarizing panel 12 and the polarizing glasses 20 in a synchronized manner, the confidentiality of the display contents can be further improved.

1 is a diagram illustrating a configuration of a display system according to Embodiment 1. FIG. 6 is a diagram for explaining the operation of the display system according to Embodiment 1. FIG. 6 is a diagram for explaining the effect of the display system according to Embodiment 1. FIG. 6 is a diagram illustrating a configuration of a display system according to Embodiment 2. FIG. It is a figure which shows the structure of the polarizing panel and polarizing glasses used for the display system which concerns on Embodiment 2. FIG. 6 is a diagram for explaining a configuration of a polarizing panel and polarizing glasses used in a display system according to Embodiment 2. FIG. 6 is a diagram for explaining a configuration of a polarizing panel and polarizing glasses used in a display system according to Embodiment 2. FIG. 10 is a diagram for explaining the effect of the display system according to Embodiment 2. FIG. It is a figure which shows the structure of the conventional display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Original image 2 Camouflage image 3 Display image 4 Camouflage image mask image 5 Image after camouflage image mask 10 Display device 11 Display element 12 Polarizing panel 12a Hole 12b Polarizing region 12A Polarizing plate 12B Transparent substrate 13 Display control device 14 Original image drawing unit DESCRIPTION OF SYMBOLS 15 Camouflage image drawing part 16 Display image drawing part 17 Polarization axis pattern generation part 18 Polarization axis control part 19 Glasses communication part 20 Polarized glasses 21 Polarization glasses control communication part 22A Polarizing plate 22B Transparent substrate 30A, 30B Polarization axis angle adjustment part 31 Liquid crystal Sheet 32a, 32b Substrate 33 Liquid crystal molecule 34a, 34b Alignment film

Claims (7)

A display device having a non-polarization region and a polarization region on the screen, and displaying a camouflage image at a position corresponding to the polarization region;
A polarizing element for filtering light from the polarizing region;
A display system comprising: The display device
A display element for combining and displaying the camouflage image and an image displayed at a position corresponding to the non-polarized region;
A polarizing panel provided on the viewing side of the display element and having a hole corresponding to the non-polarizing region;
The display system according to claim 1.   The display system according to claim 1, wherein the polarization element has a polarization axis substantially orthogonal to a polarization axis of the polarization region.   The angle of the polarization axis of the polarization element and the angle of the polarization axis of the polarization region can be changed while the angle of the polarization axis of the polarization element and the angle of the polarization axis of the polarization region are substantially orthogonal to each other. Item 4. The display system according to Item 1, 2, or 3.   The display system according to claim 4, wherein the polarization axis of the polarization element can be periodically changed in synchronization with the polarization axis of the polarization region. The polarizing element and the polarizing panel include a plurality of liquid crystal sheets,
The display system according to claim 4, wherein a polarization axis of the polarizing element and a polarization axis of the polarization region can be changed by controlling the plurality of liquid crystal sheets in multiple stages.   The display system according to claim 1, wherein a luminance of the camouflage image is higher than a luminance of an image displayed at a position corresponding to the non-polarized region.

Images