JPH11282381A - Projection display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection display system which is capable of multiple display while reducing the fatigue of eyes. SOLUTION: This system is provided with a screen 30 for displaying multiple display data, formed in a concave shape so that the viewing distance from the position 200 of the viewing point of an imaginary user is held constant and having a display area on which the multiple display data can be displayed, and a projection display device 20 which includes a projecting part for projecting the multiple display data onto the screen 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection display system, and more particularly to a projection display system capable of multi-display.

[0002]

2. Description of the Related Art In an OA environment, when a plurality of pages are simultaneously compared using a display, or when a CAD is used, a multi-display display or a large-screen display is required. P
Some C (personal computer) OSs realize multi-display.

Here, the multi-display display means C
This is the same screen display as when a plurality of normal displays such as an RT and a liquid crystal display are arranged and displayed. That is, a normal display has an aspect ratio of about 3: 4, but a multi-display display has, for example, a 3: 3 aspect ratio when it is horizontally long.
8, meaning that the display is 6: 4 if it is vertically long.

In an OA environment, a CRT or a liquid crystal display is usually used, but when realizing multi-display, two CRTs or the like are displayed side by side.

However, in order to avoid interference between CRTs, a non-display area is usually provided outside the display area. When a plurality of CRTs are arranged, a non-display area of about several cm always exists between each CRT. Will do. For example, multiple CRs
When one screen is displayed over T, the continuity of the display is interrupted, giving a viewer discomfort.

[0006] Further, for those requiring a high resolution such as CAD, the size of the CRT is preferably 21 inches or more, and the ratio of the CRT to the desk increases as the CRT becomes larger. On the other hand, when a liquid crystal display equivalent to a 21-inch CRT is used, a high-level manufacturing technique is required, and the manufacturing cost is many times as large as that of a CRT.

Further, the display surface of a CRT or a liquid crystal display is substantially flat, and when a large display or a plurality of displays are displayed side by side, the display is viewed from a virtual viewpoint position at the center and the periphery of the display. The distance will be different. Here, the viewing distance refers to a distance from the virtual viewpoint position to an object captured by the eye at the virtual viewpoint position.

[0008] The difference in viewing distance requires adjustment of the thickness of the crystalline lens of the eyes and the like, which burdens the eyes and increases the fatigue of the operator. Particularly in the OA work, the keyboard, the document, the display, and the viewpoint are moved around in a narrow space, so that eyestrain is increased compared to other works.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a projection display system capable of multi-display.

[0010]

In order to solve the above-mentioned problems, the invention according to claim 1 has a display area capable of displaying multi-display data, a screen for displaying the multi-display data, And a projection display device including projection means for projecting multi-display data on the screen.

According to the present invention, multi-display can be performed by the screen and the projection display device. Therefore, it is possible to flexibly cope with a display configuration such as a large screen, a landscape orientation, and a portrait orientation.

Further, the display of a plurality of screens can be displayed continuously without a problem without the above-mentioned problem of discontinuity of the screen. Thus, it is possible to realize an easy-to-view display for a viewer without discomfort as in the case of arranging the two displays described above.

Here, the multi-display display means C
This is the same screen display as when a plurality of normal displays such as an RT and a liquid crystal display are arranged and displayed. That is, a normal display has an aspect ratio of about 3: 4, but a multi-display display has, for example, a 3: 3 aspect ratio when it is horizontally long.
8, meaning that the display is 6: 4 if it is vertically long.

According to a second aspect of the present invention, in the first aspect, the projection display device is a rear display device that projects from the back of the screen.

According to the present invention, it is easy to integrate the projection display system by projecting from the back. In particular, in the OA work, the user can work with a sense similar to that of a normal display such as a CRT without any discomfort.

[0016] The invention according to claim 3 is based on claim 1,
2. In any one of 2), the screen is formed so as to be concave in the horizontal direction so that the horizontal viewing distance viewed from the viewpoint position of the virtual user is constant.

According to the present invention, in the operation of moving the viewpoint in the horizontal direction, for example, in comparing a plurality of pages or displaying a landscape-like image such as a landscape, a gap is formed between two displays as in the case of arranging two displays. Since it does not occur, the viewpoint can be moved without a sense of incongruity. Also, since the horizontal viewing distance is almost constant, there is no need to adjust the crystalline lens of the eyes, etc.
The eyestrain of the worker can be reduced. Here, the viewing distance refers to a distance from an eye at a viewpoint position of the virtual user to an object captured by the eye. The term “concave shape” refers to various concave shapes such as a concave shape and a cylindrical shape when viewed from the virtual user.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the screen is formed in a spherical shape so that the viewing distance of the virtual user is constant. I do.

According to the present invention, it is possible to smoothly move the viewpoint in any direction of up, down, left, and right even on a large screen display of, for example, 40 inches. Further, as described above, the burden on the eyes is small. Here, the spherical shape refers to various spherical shapes such as a concave shape, a spherical shape, and a hemispherical shape when viewed from the virtual user.

Further, the invention according to claim 5 provides the invention according to claims 1 to
In any one of the above items 4, the screen includes a Fresnel lens layer, a polarizing layer, and a hologram layer formed according to the shape of the screen.

According to the present invention, by adopting such a three-layer structure, it is possible to absorb external light and display comfortably on a screen having various shapes such as a concave surface and a spherical surface. That is, by the Fresnel lens layer, the projection light from the projection type display device is incident perpendicularly so as to converge at the center of the screen, the brightness is secured up to the peripheral portion of the screen, and the polarizing layer absorbs external light by being polarized. The projection light can be dispersed so as to increase the contrast and conform to the screen shape by the hologram layer. For example, in the case of a concave screen, the hologram layer is formed so that dispersion in the horizontal direction is increased and dispersion in the vertical direction is reduced. With such a structure, the periphery can be easily seen even on various types of screens such as large, spherical, and concave, and a comfortable display image can be obtained.

The invention described in claim 6 is the first invention.
In any one of the fifth to fifth aspects, the projection unit includes an optical modulation unit capable of multi-display display.

Here, the optical modulation unit modulates light from a light source in correspondence with video information.
A light valve such as a liquid crystal light valve can be used.

Here, it is preferable that the optical modulator is capable of polarizing. According to this, an image display with higher contrast can be obtained by combining with the polarizing layer of the screen.

It is preferable that the optical modulator is a reflection type liquid crystal light valve. According to this, by using the reflection type, the distance between the projection type display device and the screen can be made shorter, and the whole projection type display system can be made more compact.

Further, the invention according to claim 7 provides the invention according to claims 1 to
In any one of the above items 6, the projection display device includes a display control unit that selectively switches between multi-display display and single-display display.

According to the present invention, it is possible to selectively switch between multi-display display and single-display display on one screen by using one projection display device. Thereby, the multi-display display and the normal display can be switched according to the work, and the versatility is improved.

Here, the single display means to display a display image of one display.

[0029]

Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic rear view of a projection display system 10 capable of performing multi-display display according to an example of the present embodiment. Also, FIG.
It is a schematic diagram of a side section of a multi-display system according to an example of the present embodiment.

In a normal office, a chair 120 and a desk 110 are assigned to each virtual user 2 and a desk 11
A keyboard 100 of a PC (personal computer), a CRT display, a telephone, a book, and the like are placed on 0.

However, if two CRT displays are placed on the desk 110 so as to support multi-display, a non-display area of about several centimeters always exists between each CRT display. And discomfort to the viewer.

The display surface of the CRT display or the liquid crystal display is substantially flat. When displaying a large display or a plurality of displays side by side, the virtual user 2 is located at the center and the periphery of the display. The viewing distance from the viewpoint position 200 will be different. Here, the viewing distance refers to a distance from the virtual viewpoint position to an object captured by the eye at the virtual viewpoint position.

The difference in viewing distance requires adjustment of the thickness of the crystalline lens of the eyes and the like, which places a burden on the eyes and increases the fatigue of the operator. In particular, in the OA work, the time during which the user is staring at the display tends to be long, so that eye fatigue tends to increase as compared with other works.

In this embodiment, as shown in FIG. 1 and FIG. 2, a screen 30 having a display area capable of displaying multi-display data and displaying the multi-display data is provided. And a projector 20 as a projection display device including a projection unit for projecting the image on a screen 30.

According to this, multi-display can be performed by the screen 30 and the projector 20. Therefore, it is possible to flexibly cope with a display configuration such as a large screen, a landscape orientation, and a portrait orientation.

Here, the multi-display display means C
This is the same screen display as when a plurality of normal displays such as an RT and a liquid crystal display are arranged and displayed. That is, a normal display has an aspect ratio of about 3: 4, but a multi-display display has, for example, a 3: 3 aspect ratio when it is horizontally long.
8, meaning that the display is 6: 4 if it is vertically long. As a display example, various displays are possible as shown in FIG.

FIG. 3 shows an example of a multi-display screen displayed on a screen according to an embodiment of the present invention. FIG. 3A shows an example in which a plurality of different screen displays are displayed on one screen 30, and FIG. Is an example in which one screen display is displayed on one screen 30 over a display area for a plurality of screens, and FIG. 3C is an example in which one screen display is displayed on the entire screen 30 over a display area for a plurality of screens. An example is shown below. As shown in FIG. 3C, according to the present embodiment, the entire screen 30 can be used effectively.

Further, without the above-described problem of the discontinuity of the screen, as shown in FIGS. 3B and 3C, the display of a plurality of screens can be displayed continuously without a seam. Thus, it is possible to realize an easy-to-view display for a viewer without discomfort as in the case of arranging the two displays described above.

In the operation of moving the viewpoint with respect to the screen 30, for example, in comparing a plurality of pages shown in FIG. 3A or displaying a landscape image such as a landscape shown in FIG. Since there is no gap between the two as in the case where two are arranged, the viewpoint can be moved without a sense of incongruity.

As shown in FIGS. 1 and 2, the visual distance L from the viewpoint position 200 of the virtual user 2 to the screen 30 is shown.
The screen 30 is formed in a concave and spherical shape so that 1 is constant.

As a result, since the viewing distance with respect to the screen 30 is substantially constant, there is no need to adjust the crystalline lens of the eyes and the like, and the eyestrain of the operator can be reduced. Here, the viewing distance refers to a distance from an eye at a viewpoint position of the virtual user to an object captured by the eye.

Further, as shown in FIG.
Reference numeral 0 denotes a rear projector 20 that projects from the back of the screen 30.

According to this, it is easy to integrate the projection display system 10 by projecting from the back. In particular, in the OA work, the user can work with a sense similar to that of a normal display such as a CRT without any discomfort.

FIG. 4 is a functional block diagram of a projector 20 as a projection display device according to an example of the present embodiment. In the present embodiment, as shown in FIG. 3, the projector 20 is formed so that the screens of two displays can be displayed side by side. In this case, the display data from the PC 150 is transmitted to the control unit 4 by the projector 20.
Under the control of 5, the image is stored in the storage unit 42 such as a memory, and is projected toward the screen 30 by the projection unit 50.

The projection unit 50 includes a reflective liquid crystal light valve 5.
2 and is controlled by a display control unit 46 included in the control unit 45. The reflection type liquid crystal light valve 52 is a kind of an optical modulation unit capable of multi-display. Here, the optical modulation unit modulates light from a light source in accordance with video information.

FIG. 5 is a view showing the principle of projection of the projection unit 50 according to an example of the present embodiment. The projection unit 50 includes a light source 60
A reflective liquid crystal light valve 52, and a color wheel 6 configured to be switchable corresponding to the three primary colors of the image of the reflective liquid crystal light valve 52, and rotated at a high speed.
2 and a polarization beam splitter (PBS) 70 having a polarization selective reflection mirror 72.

The incident light 302 from the light source 60 that has passed through the color wheel 62 is polarization-separated by the polarization beam splitter 70, and light of one of the polarization axes is reflected by the internal polarization selective reflection mirror 72. This reflected light 30
Reference numeral 4 irradiates a reflective liquid crystal light valve 52 including a reflective ferroelectric liquid crystal panel. The reflection type liquid crystal light valve 52 is light-modulated by a video signal, whereby the reflectance can be modulated. Thereby, the reflected light 306 whose polarization axis direction is substantially 90 degrees passes through the polarization selective reflection mirror 72 inside the polarization beam splitter 70 and is projected on the screen 30 via the projection lens 64.

As described above, by using the reflection type, the distance between the projector 20 and the screen 30 can be made shorter, and the whole projection display system 10 can be made more compact.

FIG. 6 is a schematic view showing a light valve 52 according to an example of the present embodiment, which is capable of multi-display and uses one liquid crystal 54.

A liquid crystal light valve used for displaying a normal one screen includes a single liquid crystal having an optical modulation area for one screen and a scan electrode driving circuit (Y) for specifying one set of horizontal scanning lines. Driver) and a signal electrode drive circuit (X driver) for specifying a pixel on the specified horizontal line.

In this embodiment, in order to realize multi-display display for two screens in the horizontal direction, the reflection type liquid crystal light valve 52 is provided with an optical modulation area 54- for two screens in the horizontal direction. One liquid crystal 54 including the liquid crystal elements 1 and 54-2, and two sets of X drivers 56-1 and 56-2 and Y drivers 58-1 and 58 corresponding to the optical modulation areas 54-1 and 54-2, respectively. -2.

Since the liquid crystal 54 is a so-called silicon chip-based liquid crystal, the liquid crystal 54 is not limited to two screens in the horizontal direction but can be applied to various multi-display screens.

The flow of display data for two screens is as follows. As described above, first, the display data (data 1) 152 for one screen generated by the PC 150 is displayed.
1 and the other one screen worth of display data (data 2) 152
-2 is stored in the storage unit 42 by the control unit 45.

Further, similarly to the display data 152, the PC1
50 (ST1) 154-1 indicating the start timing of displaying the display data 152-1 from the F.50, and data (S1) indicating the start timing of displaying the display data 152-2.
T2) 154-2 is also stored in the storage unit 45 by the control unit 46.

Based on the start timing data 154-1 and 154-2, the display controller 46 projects the two sets of Y drivers 58 so as to project the display data 152-1 and 152-2 stored in the storage 42. -1, 58-2 and the X drivers 56-1 and 56-2.

As a result, the liquid crystal 54 corresponding to the optical modulation area 54-1 is projected so as to project the display data 152-1.
Is driven.

Similarly, the liquid crystal 54 corresponding to the optical modulation area 54-2 is driven so as to project the display data 152-2.

If the start timing data 154-1 and the start timing data 154-2 indicate the same timing, the driving of the areas 54-1 and 54-2 for two screens is controlled in parallel, and Image will be displayed.

When the timing of the start timing data 154-2 is later than the start timing data 154-1, it is possible to draw two screens in order, that is, in series.

The following effects can be obtained by employing the above-described configuration of the reflection type light valve 52. First, since it is a reflection type, the distance between the projection type display device and the screen can be made shorter, and the whole projection type display system can be made more compact.

Further, by using the silicon-based liquid crystal 54, it is possible to perform multi-display display with one liquid crystal.

Further, independent drivers 56-1 and 58 are provided.
By using -1, 56-2, and 58-2, multi-display display and single-display display can be selectively switched. Thereby, the multi-display display and the normal display can be switched according to the work, and the versatility is improved.

Here, the single display display means
This means displaying a display image for one display.
Note that the single display can be displayed on one side as shown in FIG.
As shown in FIG. 7, one screen can be displayed over two screens.

FIG. 7 is a schematic view of a plane cross section of a screen 30 according to an example of the present embodiment. Screen 30
Is configured to include a Fresnel lens layer 32, a polarizing layer 34, and a hologram layer 36 formed in accordance with the shape of the screen 36.

First, the projection light 300 projected from the projector 20 is incident on the Fresnel lens layer 32 at right angles so as to converge on the center of the screen 30. As a result, sufficient brightness can be secured up to the peripheral portion of the screen 30.

When the polarizing layer 34 is not provided, the external light is uniformly absorbed by the screen 30, but the external light can be selectively absorbed by the polarized light, and the contrast can be increased when displaying. Note that the polarizing layer 34 is formed of a resin. Projection light 30 that has passed through polarizing layer 34
0 will be displayed via the hologram layer 36.

The hologram layer 36 is formed of a resin, and is formed so as to disperse the projection light 300 so as to conform to the shape of the screen 30. For example, as shown in FIG. 7, the dispersed light 310 transmitted through the hologram layer 36 is formed such that the dispersion in the vertical direction is small and the dispersion in the horizontal direction is large, as shown in FIG. ing. Thereby, even in the case of the horizontally long screen 30 or the like, the peripheral portion can be clearly seen.

By adopting such a three-layer structure, it absorbs external light and has a high contrast up to the peripheral portion even for screens of various shapes such as not only a plane shape but also a concave shape, and displays images comfortably. be able to.

As described above, the reflection type liquid crystal light valve 52 can project polarized light. According to this, a higher-contrast image display can be obtained by corresponding to the polarization method of the polarizing layer 24 of the screen 30.

That is, the projection light 300 projected from the reflection type liquid crystal light valve 52 has polarization characteristics. For this reason, the screen 30 can selectively absorb the projection light 300 polarized not in the same direction but in one certain direction, so that the contrast can be increased.

As described above, the screen 3
By using 0, the display continuity is not interrupted, so that the viewer does not feel uncomfortable, and by forming the screen 30 in a concave shape, the screen 3
Since the viewing distance up to 0 is constant, eye fatigue can be reduced, and by adopting the three-layer structure described above,
Even if the screen 30 is large, a projection type display system with high contrast and easy to see the periphery can be provided.

The invention according to the present embodiment is not limited to the above-described embodiment, and various modifications are possible.

FIG. 8A is a schematic view of one projector 20 and the screen 30 viewed from above, and FIG. 8B shows an example in which two projectors 20 are provided.

As shown in FIG. 8B, if two projectors 20-1 and 20-2 are provided, a projection display system 10 capable of displaying a wider area can be realized.

In addition to the multi-display display, it is also possible to perform the same single-display display on the multi-display display screen 30 as in the conventional case.

As shown in FIG. 4, the projector 20 is provided with a display control unit 46 that controls the projection unit 50 and selectively switches between multi-display display and single-display display. A single display similar to the conventional one can be displayed on the multi-display screen 30.

The multi-display display is not limited to the above-described two screens in the horizontal direction, and various modifications such as display of four screens are possible.

The screen 30 can be not only concave and spherical, but also concave and cylindrical, that is, concave in the horizontal direction or planar.

[0079]

[Brief description of the drawings]

FIG. 1 is a schematic rear view of a projection display system 10 capable of performing multi-display display according to an example of the present embodiment.

FIG. 2 is a schematic side sectional view of a multi-display system according to an example of the present embodiment.

3A and 3B are diagrams illustrating an example of a screen in which multiple displays are displayed on a screen according to an example of the present embodiment, wherein FIG. 3A illustrates an example in which a plurality of different screen displays are displayed on one screen, and FIG. An example in which the screen display is displayed on one screen over a display area for a plurality of screens.
An example is shown in which one screen display is displayed over one screen over a display area for a plurality of screens.

FIG. 4 is a functional block diagram of a projection display device according to an example of the present embodiment.

FIG. 5 shows a principle diagram of projection of a projection unit according to an example of the present embodiment.

FIG. 6 is a schematic diagram of a light valve using one sheet of liquid crystal which can perform multi-display and according to an example of the present embodiment.

FIG. 7 is a schematic diagram of a plane cross section of a screen according to an example of the present embodiment.

8A and 8B are schematic plan views of a screen and a projector according to an example of the present embodiment. FIG.
(B) shows a case where there are two projectors.

[Explanation of symbols]

 2 Virtual User 10 Projection Display System 20 Projector 30 Screen 32 Fresnel Lens Layer 34 Polarization Layer 36 Hologram Layer 42 Storage Unit 46 Display Control Unit 50 Projection Unit 52 Reflective Liquid Crystal Light Valve 54 Liquid Crystal 60 Light Source 62 Color Wheel 70 Polarizing Beam Splitter 72 polarized light selective reflection mirror 100 keyboard 110 desk 120 chair 150 display data generation unit 200 viewpoint position of virtual user 300 projection light 302 incident light 304, 306 reflected light 310 dispersed light

Claims (7)

[Claims] 1. A projection display apparatus having a display area capable of displaying multi-display data, a screen for displaying the multi-display data, and a projection unit for projecting the multi-display data on the screen. And a projection display system comprising: 2. The projection display system according to claim 1, wherein the projection display device is a rear display device that projects from the back of the screen. 3. The screen according to claim 1, wherein the screen is formed in a concave shape in a horizontal direction so that a horizontal viewing distance viewed from a viewpoint position of the virtual user is constant. Projection type display system. 4. The projection display system according to claim 1, wherein the screen is formed in a spherical shape so that the viewing distance of a virtual user is constant. 5. The screen according to claim 1, wherein the screen is configured to include a Fresnel lens layer, a polarizing layer, and a hologram layer formed in accordance with the shape of the screen. Characteristic projection display system. 6. The projection display system according to claim 1, wherein the projection unit includes an optical modulation unit capable of multi-display. 7. The projection display system according to claim 1, wherein the projection display device includes a display control unit for selectively switching between multi-display display and single-display display.