JPH1049063A - Display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a display system constituted so that the preservation of secrecy is made to be compatible with the security of business by allowing a worker to clearly view a display and preventing outsiders from viewing the contents of the display. SOLUTION: A polarizing film 12 is stuck to the display surface of a display device 11 so that light emitted from a screen is made into the linearly polarized light. Besides, a similar polarizing film 13 is stuck to the entire surface of the inside of the glass 19 of the window 3 of the installing room of the display device 11 by being ad justed so that the polarization direction thereof becomes a right-angle direction with respect to the film 12. As the result, the brightness of the display screen becomes about half with respect to an operator 2 in the room but the display is clearly viewed by the operator 2. Besides, the screen in the room is not viewed by people 4 outside the room but the state of the inside of the room can be sufficiently grasped by the people 4 outside the room.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display system, and more particularly to a display system in which display contents can be clearly observed in a use environment of a display device, but the display contents cannot be visually recognized from outside. It is about.

[0002]

2. Description of the Related Art A display device (monochrome and color) including a CRT such as a computer, a word processor and an automatic cash dispenser, a liquid crystal display device, a plasma display panel, etc., mainly uses the display light emitted from a display screen by the worker and the operator. It is designed for the purpose of improving the visibility of the attendee, and as shown in FIG. 4, the worker 2 and the attendee using the display device 1 can clearly observe the screen. However, little consideration is given to the view of the screen by the outsider 4, and the outsider 4 can also view the display contents of the screen of the display device 1 through the window 3, and the confidentiality is reduced. There were drawbacks.

[0003] Conventionally, as a method of preventing outsiders from seeing, as shown in FIG. 5, a half mirror process 6 is applied to the window 3 or a half mirror is used for the window 3 itself.
By arranging a bright illumination light source 5 or the like outside the room, the interior of the room where the display device 1 is arranged is relatively dark, and the exterior is relatively bright, thereby providing a difference in the brightness between the interior and the exterior. It was common to protect from the eyes of outsiders 4.

[0004]

However, if the window is formed as a half mirror as in the prior art, there is a problem that the entire room cannot be seen, and the state of workers in the room cannot be grasped.

[0005] The present invention has been made in view of such problems of the prior art, and has as its object the purpose of making the display clearly visible to workers and attendants, and to visually recognize the display contents to outsiders. It is an object of the present invention to provide a display system that balances confidentiality and work safety by preventing such a situation.

[0006]

According to the present invention, there is provided a display system comprising a display device and a window for partitioning a use environment of the display device from the outside. And the polarization direction of the display light emitted from the window is substantially orthogonal to the polarization transmission direction of the window, so as to prevent an outsider from viewing the display screen.

In this case, a cathode ray display tube (hereinafter abbreviated as CRT) or a plasma display panel (hereinafter abbreviated as PDP) is used as a display device, a first polarizing film is arranged on its display surface, and a second polarizing film is arranged on a window. The polarizing film may be arranged so that the polarizing characteristics are substantially perpendicular to the first polarizing film, and a liquid crystal display device having a polarizing plate on at least the observation side is used as a display device, and the polarizing film is used for the window. The film may be arranged such that the polarization characteristics are substantially perpendicular to the polarizing plate on the viewing side of the liquid crystal display device.

In the present invention, since the polarization direction of the display light emitted from the display screen of the display device and the polarization transmission direction of the window are substantially orthogonal to each other, an observer of the display device can display an image. Although it is clearly visible and the outside person can see the inside of the room, the display screen is not visible, which contributes to the balance between confidentiality, business safety and crime prevention. Further, since the polarization direction of the external light beam transmitted through the window is orthogonal to the polarization direction of the display unit, it also has an antiglare effect of reducing the reflection of the external light beam on the screen.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The principle and embodiments of a display system according to the present invention will be described below. First, the principle of the present invention will be described with reference to the schematic diagram of FIG. In the figure, 11 is CRT, P
A display device such as a DP (plasma display panel); 12 a screen polarizing filter to be attached to a display surface of the display device;
Is a polarizing filter for a window attached to a window. When a liquid crystal display device is used as the display device 11, the polarizing filter for the screen is omitted because the polarizing filter is integrally provided on the display surface thereof.

With such a configuration, the display device 11
Is passed through the screen polarizing filter 12, thereby causing the polarization direction of the screen polarizing filter 12 (direction of a transmissible polarization plane; horizontal direction in the figure) as indicated by reference numeral 15 in the figure. Is a linearly polarized light having a polarization plane in the same direction as In the figure, the light 15 is mostly polarized in the horizontal direction, but is shown to include a slight vertical polarization component. This represents a case where the polarization characteristics of the screen polarizing filter 12 are not 100%. In this state,
Since the linearly polarized light 15 can be seen by the worker and the co-occupant 18 using the display device 11, the display on the display device 11 can be clearly observed and work can be performed.

The linearly polarized light 1 that has passed through the polarizing filter 12
5 is a polarizing filter for a window 1 attached to a window thereafter.
3, but the polarization direction of the window polarization filter 13 is set so as to be orthogonal to the polarization direction of the polarization filter 12 (vertical direction in the figure), so that the light 15 passes through the window polarization filter 13. Blocked and almost impassable. In the drawing, for the purpose of illustration, the light 16 that has passed through the window polarization filter 13 is depicted.
If the polarization characteristics of 2 and 13 are 100%, this light does not exist. Therefore, the outsider 17 outside the window cannot see the display on the display device 11, and there is no possibility that the confidential information will be leaked. However, the display device 11 including the worker in the window and the attendant 18
Since unpolarized light, which is not polarized, is emitted from objects other than the window, the state of the worker inside the room can be seen by the person 17 outside the window.

As described above, if the polarization direction of the display light 15 of the display device 11 and the polarization transmission characteristics of the window are set in combination so as to have a blocking relationship, the display light 15 cannot pass through the window,
As a result, the display light hardly reaches the eyes of the outsider 17. The present invention is an application of this function.

Specifically, it can be easily realized by arranging the polarizing films 12 and 13 so that the polarizing directions are orthogonal to each other. In addition, the user of the display device 11 and the attendant 18 have a feature that the display quality is not significantly reduced and the display device 11 can be clearly recognized.

Hereinafter, several embodiments of the present invention will be described. FIG. 2 shows one embodiment. This embodiment is a display system in a factory, an office, or the like. In a 15-inch CRT 11, a polarizing film (manufactured by Nitto Denko Corporation) 12 is attached to the tube surface, and light emitted from the screen is linearly polarized. Next, the glass 1 of the window 3 of the operation terminal installation room
A similar polarizing film 13 was attached to the entire inner surface of 9 so that the polarizing direction was perpendicular to the polarizing film 12. In this case, the brightness of the display screen was reduced to about half to the terminal operator 2 such as a computer in the room, but the screen in the room was not seen at all from the outside. However, the outsider 4 was able to fully understand the state of the room.

FIG. 3 shows another embodiment. This embodiment is a display system in a bank, a telephone booth or the like, and in an operation terminal of an automatic cash dispenser or a button type telephone,
A polarizing film (Nitto Denko Corporation) is displayed on the screen of the display device 11.
12) was affixed, and the light emitted from the screen was linearly polarized. In the case where a polarizing plate is provided on the observation side as in the display device 11, the polarizing plate plays the role of the polarizing film 12. Next, the same polarizing film 1 is applied to the entire inner surface of the glass 19 of the door / window 20 of the operation room.
3 was attached to the polarizing film 12 so that the polarizing direction was perpendicular to the polarizing film 12. In this case, the brightness of the display screen is reduced by about half to the operator 2 such as an automatic cash dispenser in the operation room (no change in the case of the liquid crystal display device), but the screen in the room is completely visible from outside the operation room. Did not. However, the outsider 4 was able to fully understand the state of the room.

As is apparent from this embodiment, what is characteristic of the present invention is that although the display screen is not visible from the outside, the inside situation can be observed, so that the outdoor standby person or the like can use a terminal equipped with a display device. It is that it is possible to accurately grasp the use situation of the terminal, and it is difficult to hide in a terminal room or the like with malicious intent, which is effective in preventing crime.

Although the display system of the present invention has been described based on the principle and some embodiments, the present invention is not limited to these embodiments, and various modifications can be made.

[0018]

As is apparent from the above description, according to the display system of the present invention, the polarization direction of the display light emitted from the display screen of the display device is substantially orthogonal to the polarization transmission direction of the window. Therefore, the observer of the display device can clearly see the display, and the outside person can see the inside of the room, but cannot see the display screen. It contributes to. Further, since the polarization direction of the external light beam transmitted through the window is orthogonal to the polarization direction of the display unit, it also has an antiglare effect of reducing the reflection of the external light beam on the screen.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining the principle of a display system according to the present invention.

FIG. 2 is a diagram showing a schematic configuration of one embodiment.

FIG. 3 is a diagram showing a schematic configuration of another embodiment.

FIG. 4 is a diagram for explaining a problem of a conventional display device.

FIG. 5 is a diagram for explaining a problem of a conventional display system using a half mirror for a window.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 ... Operator 3 ... Window 4 ... Outdoor person 11 ... Display device 12 ... Screen polarizing filter 13 ... Window polarizing filter 14 ... Display light 15 ... Linearly polarized light 16 ... Transmitted light 17 ... Outside person 18 ... Worker and the same person Person 19 ... glass 20 ... door and window

Claims (3)

[Claims] 1. A display system comprising a display device and a window for partitioning a use environment of the display device from the outside, wherein a polarization direction of display light emitted from a display screen of the display device and a polarization transmission direction of the window are determined. Are configured to be substantially orthogonal,
A display system wherein an outsider is prevented from viewing the display screen. 2. A cathode ray tube or a plasma display panel is used as the display device, a first polarizing film is disposed on a display surface of the display device, and a second polarizing film is provided on the window and the first polarizing film is different from the first polarizing film. 2. The display system according to claim 1, wherein the characteristics are arranged so as to be substantially orthogonal. 3. A liquid crystal display device having a polarizing plate on at least the observation side as the display device, wherein a polarizing film is provided on the window in a direction substantially perpendicular to the polarizing plate on the observation side of the liquid crystal display device. The display system according to claim 1, wherein the display system is arranged so as to be arranged as follows.