JPH0353287A - Large-screen display device - Google Patents

Abstract

PURPOSE:To eliminate a mechanical joint and to prevent the irregularity of color and the unevenness of brightness by arranging a light source, a 1st lens group having positive refractive power, a light transmission type display and a 2nd lens group having negative refractive power in this order, thereby constituting a unit display. CONSTITUTION:Divergent light from a light source 1 passes the 1st lens group 2, the light transmission type display 3 and the 2nd lens group 4 in this order and arrives at a screen 5. The 1st lens group 2 has the positive refractive power and the light source 1 is arranged at the focusing position of the 1st lens group 2 on a light source side. Therefore, the divergent light from the light source 1 passes the 1st lens group 2 and then becomes the collimated beam of light to irradiate the light transmission type display 3. The 2nd lens group 4 has the negative refractive power and enlarges the display screen of the display 3. Thus, the displayed images on the unit display 6 are joined on the screen 5 to obtain a large screen, so that the mechanical joint is not produced. The irregularity of color and the unevenness of brightness are prevented from occurring on the screen of the light transmission type display.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a large screen display device that forms a large screen using a plurality of light transmissive displays.

[Conventional technology]

In recent years, displays have been required to have larger screens and be thinner, and various devices have been proposed that apply light-transmissive displays, such as liquid crystal display devices that are ideal for rectangular displays. for example,
National Technical Report
Vol. 33 No. l Feb. 1987
A configuration as shown in FIG. 2 has been proposed.

In Fig. 2, 1 is a light source and 3 is a light transmission type display. In this proposal, light-transmitting displays 3 that display a screen using light from a light source 1 are arranged closely adjacent to each other to obtain a thin, large-screen display ai.

Also, JP-A-61-138288>
Publication B proposes a structure as shown in FIG.

In FIG. 3, l is a light source, 3 is a light transmission type display, and 5 is a screen. In this proposal, diverging light from a light source 1 is irradiated onto a light-transmissive display 3, and an enlarged screen of the light-transmissive display 3 is projected onto a screen 5. By connecting these projected enlarged screens, a thin A large circular display device was obtained.

[Problem to be solved by the invention]

Above National Technical Re
port Vol. 33 No. I Feb.
In the prior art proposed in 1987, there was a problem in that a seam was created between light-transmissive displays, resulting in an unnatural screen. For example, connect 64 light-transmissive displays mentioned in this proposal (8 vertically, 8 horizontally) to obtain a large screen with a screen size of 1.6 m in height and 2.1 m in width. In this case, there are approximately 10+n+e seams between the light transmissive displays. This is vertical 1. Radiation 10+am in a 6m x 2.1m wide screen
This corresponds to seven straight lines being drawn vertically and horizontally, resulting in an unnatural screen with noticeable seams. In the case of a method such as this, which simply connects light-transmissive displays as proposed in the present invention, it is difficult to use such a method because the conventional technology, in which there is inevitably a uniform connection, enlarges the screen on the light-transmissive displays and connects them. , no mechanical joints occur. However, since diverging light from a light source enters the light transmission type display, the angle of the incident light rays varies depending on the height of the light transmission type display. As a result, uneven color and brightness occur on the screen of the light transmission type display, and as a result, uneven color and uneven brightness occur in the enlarged image on the screen, resulting in an unnatural screen as in the prior art.

An object of the present invention is to provide a large-screen display that is thin and free from mechanical joints, uneven color, and uneven brightness, in contrast to the prior art.

[Means to solve the problem]

In order to achieve the above object, a unit is constructed by arranging at least a light source, a second lens group having a positive refractive power, a light transmission type display, and a second lens group having a negative refractive power in this order. A display is configured, and a plurality of the unit displays are placed adjacent to each other 15t! A screen is placed in front of the unit display to form a large screen on the screen.

Furthermore, in order to eliminate the seams between the display images of each unit display, the first lens group or the second lens group
The display image of the light transmission type display is enlarged by the lens group, or both of these groups, and the graphical distortion of the enlarged display image is suppressed by the first lens group, the second lens group, or both of these groups. It is corrected by group.

Furthermore, in order to obtain a large screen with no uneven color or brightness,
The first lens group converts the diverging light from the light source into a parallel beam of light, and the second lens group magnifies the display image of the unit display.

[Effect]

Divergent light from the light source passes through the first lens group, the light transmission type display, and the second lens group in this order, and reaches the screen. The first lens group has positive refractive power, and the light source is arranged near the focal point of the first lens group on the light source side. As a result, the diverging light from the light source becomes a parallel beam of light after passing through the first lens group and is irradiated onto the light transmission type display, so that there is no color unevenness or brightness unevenness on the screen of the light transmission type display. The second lens group has a negative refractive power and enlarges the display screen of the light transmission type display, so that an enlarged screen of the light transmission type display without color unevenness or a degree unevenness can be obtained on the screen. In the present invention, a unit display is constructed by a light source, a first lens group, a light transmission type display, and a second lens group, and a plurality of unit displays are arranged side by side using a coupling means for arranging the unit displays adjacent to each other. However, since a large screen was obtained by arranging a screen on the 4th surface of the i''l' screen and connecting the displayed images of each unit display on the screen, no mechanical joints were created.Furthermore, the first lens group, Alternatively, the second lens group, or both of these groups, corrects the distortion of the displayed image on the unit display.Since the displayed image of the unit display is not distorted, when the displayed images are connected to form a large screen, each display A natural large screen with no seams between images and no discomfort can be obtained.Furthermore, in the present invention, the first lens group or the second lens group may be configured to include a lens having at least one aspherical surface, or a Fresnel lens. By using lenses, effects such as a reduction in the number of lenses and weight reduction can be obtained.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 1st
The figure shows the large screen display of this embodiment! This is an example of the A position. In FIG. 1(a), 1 is the light source, 2 is the first
The lens group 3 is a light transmission type display, 4 is a second lens group, and 5 is a screen, and the light 11 to the second lens group 4 constitute a unit display (6). The light source 1 uses a halogen lamp or a xenon lamp. The first lens group is composed of two lenses having positive refractive power. The effective screen size of the light-transmissive display is 5 inches (diagonal length 125 m).
m) liquid crystal display panel is used. Second lens group 4
is composed of one lens with negative refractive power.The screen 5 has a screen size of 100 inches (diagonal length 2
．． 5m).

The light source 1 is arranged near the principal point position of the first lens group 2 on the light source side, so that the diverging light emitted from the light source 1 becomes a substantially parallel beam of light after passing through the first lens group 2, and the light transmission type display 3 to 1 ((projection. Therefore, uneven color, R
A screen with no unevenness is obtained. Transparent display 3
The parallel light flux after passing is deflected by the second lens group 4 and reaches the screen 5. As a result, an enlarged screen of the light transmission type display 3 is obtained on the screen 5. In the unit display 6 of this embodiment, a liquid crystal display panel with a diagonal screen size of 5 inches is used as the light transmission type display 3, and the second lens r! 14, it was enlarged approximately twice as much. 10
You're getting an inch screen. Furthermore, in this embodiment, vertical 1
By arranging 0 unit displays 6 and 10 units horizontally, the total number of unit displays 6 is 100 units.
We are getting an inch large screen display device.

FIG. 1(b) shows the external appearance of the large screen display device of this embodiment, which has a 100 inch large screen with a depth of 0.3~0. It has been realized with an ultra-thin design of 5 rn.

FIG. 4 shows the lens configuration of the unit display 6 of this embodiment. A numerical example corresponding to FIG. 4 will be shown below.

In the numerical example, Ri is the LIIL radius of the first lens surface Si from the light source side, D1 is the distance on the optical axis from lens surface Si to lens surface SL, and Nj and Vj are each from the light source side. In this order, the refractive index and Atsube number of the j-th lens, L is the distance between the light source 1 and the screen 5, M is the magnification by the second lens group 4, and h0 is the diagonal size of the light transmission type display. .

Numerical example corresponding to FIG. 4 L=236+*m, M=1.96 times, ho=5 inches S R D N
V1 ■ 53.02
-140.000 21.0 1.6
7270 32.103 -66.802
1.04 1270.000 2
1.0 1,67270 32.105
-130.98 10.06 0
20.0 7 -212.79 5.0 1.8
4666 23.888 324.28
105.09co However, S is a light source, S is a light transmission display, S9
is a dummy surface corresponding to a screen.

Next, color unevenness in this example will be described. FIG. 5 shows the angle of the light rays emitted from the light source 1 and incident on the light transmission type display 3 via the first lens group 2, and the height of the light transmission type display 3 in the 10th angle direction. Indicated. As shown in the figure, in this embodiment, the incident light angle of the light transmission type display 3 is 3 degrees or less, resulting in a substantially parallel light flux, and no color unevenness or brightness unevenness occurs on the light transmission type display 3. This will prevent uneven color and brightness)
I'm getting a lot of screen time.

Next, the joints caused by the isomorphic distortion number of the unit display 6 will be explained. FIG. 6 shows the distortion of the screen on the screen 5, where (a) is the graphical distortion with respect to the height on the light-transmissive display 3 in the vertical direction, and (b) is the distortion in the horizontal direction on the light-transmissive display 3. This is the figure distortion for the height above 3. (c) schematically shows how the rectangular screens of four unit displays are connected on the screen 5 to form one screen. In this embodiment, the graphical distortion of the screen on the screen 5 corresponding to the outermost periphery of the light-transmissive display 3 in both the vertical and horizontal directions is 0.01%, and at this time, the deviation between each screen is about 0.1 mm. It is. Therefore, in this embodiment, a large screen with no seams caused by graphic distortion of the unit display 6 is obtained.

Next, an example in which an aspherical lens is applied to the first lens group or the second lens group will be described.

Figure 7 shows the lens configuration of an example in which the lens group in Figure 2 is composed of i lenses each having negative refractive power and both surfaces of which are aspherical, and 4' is a numerical value using an aspherical lens. Let me give you an example. Di, Di, Nj, Vj, L in numerical examples
, M are the same as the definitions of the numerical embodiment corresponding to FIG.

Numerical example corresponding to Fig. 7 L = 210 (mm), M = 2.0 (times)
, h, = 5 [inch] S R D
55.0 2 -197.10 19.0 1.84 on NV
666 23.883 -74.21 1
．． 0 4 -1096.0 17.0 1'. 84
666 23.885 -132.70
10.06oo■4.0 7 -145.81 5.0 1.846
66 23.888 252.76 89
．． 0 9 ω Further, the lens surface whose radius of curvature is marked with a wooden mark is an aspherical surface, and its shape is expressed as follows using the aspherical coefficient of the following equation.

Z: Distance from the tangent plane of the aspheric apex on the aspheric surface at height Y from the optical axis C: Curvature of the reference spherical surface (1/r) K: Conic constant Y: Height A4 to Ae from the optical axis. :Aspheric coefficient 7 surface K=0.175O A4=-1.2341X10-
7A,=4.2798X10-11A,=1.6446
X10-15A,. =3.2262X10-”8 sides K=
1.3789 A. =-1.3'j79xlO-'A
,=-1.2810xlO-"A.=3.7944xl
OA,. =4.9950xlO In addition, in this embodiment, the graphical distortion at the periphery of the unit display in the vertical and horizontal directions is respectively o. oi%, and according to this unit display, a large screen display device without any seams due to graphical distortion can be obtained.

Next, Fig. 6 shows an example in which a Fresnel lens is applied to the first lens group or the second lens group. This is an example lens {}♂ in which the lens group is composed of one Fresnel lens having negative refractive power, and 2'
4'' is a first lens group using a Fresnel lens, and 4'' is a second lens group using a Fresnel lens.

Next, an embodiment will be described in which a lens in the upper lens group 2 is laminated with a color temperature conversion effect or a heat absorption effect, or a lens having either of these effects.

In the embodiment shown in FIG. 9, 7 is a laminated lens that has a color temperature conversion effect, a heat absorption effect, or both of these effects. Displays that use halogen lamps or xenon lamps as light sources often require color temperature conversion filters or heat absorption filters. In this example, since some lenses in the first lens group 2 have a color temperature conversion effect or a heat absorption effect, or both of these effects, a color temperature conversion filter or a heat absorption filter is newly installed. Since there is no need to do this, the configuration can be simplified.

Next, an example will be described in which the surfaces of the lenses in the first lens group 2 are subjected to a color temperature conversion effect, a heat absorption effect, and a film treatment that has both of these effects. In the embodiment shown in FIG. 1O, 8 is a thin film that has a color temperature conversion effect, a heat absorption effect, or both of these effects. According to this embodiment, a part of the first lens group 2 is subjected to a capillary treatment that has a color temperature conversion effect or a heat absorption effect, and has both of these effects. There is no need for new installation and the structure can be simple.

Next, an embodiment will be described in which special screens such as vertically long and horizontally long screens are constructed by arranging the unit displays in different vertical and horizontal directions.

FIG. 11 shows an example of a screen when a multi-display is constructed using the unit displays shown in FIG. 1. In Figure 11(a), 3 in the vertical direction and 3 in the horizontal direction.
unit display, totaling 18 units vertically.
The screen is 24 inches wide and has an aspect ratio of 3:4, which complies with normal broadcasting standards. On the other hand, in Figure 11(b), three unit displays are arranged in the vertical direction and four unit displays in the horizontal direction, and the overall size is 18 inches tall and 32 inches wide, supporting high-definition television broadcasting with an aspect ratio of 9:16. I am getting a horizontally long screen. Furthermore, by increasing the number of unit 1 displays in the vertical and horizontal directions, a larger screen can be obtained.

Next, a plurality of lenses in the first lens group or the second lens group are molded at the same time by a method such as molding or injection molding, and the joint portion of each lens is formed into a joining means for arranging a Uninote display. An example will be shown below.

Fig. 12(a) has four unit displays shown in Fig. 1, and each of the four lenses of the first lens group and the second lens group is molded at the same time, and the joint parts are used when arranging the unit displays. The large screen display device of the present invention is shown when used as a coupling means, and FIG. 12(b) shows the lens during molding.

According to this embodiment, there is no need for means for coupling the unit display with adjacent lenses.

〔Effect of the invention〕

According to the present invention, since a unit display is composed of at least a light source, a first lens group, a light transmission type display, and a second lens group, brightness uniformity and distortion correction are optically performed in each unit display. Because of this, it is possible to create a thin, large, high-quality screen with no color unevenness or seams as a large screen display, and the screen size and screen aspect ratio can be freely selected.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of a large screen display device according to the present invention, Figs. 2 and 3 are block diagrams of a conventional large screen display device, and Fig. 4 is a block diagram of a lens of a unit display. , Fig. 5 is a characteristic diagram showing the angle of incident light to the light transmission type display of the unit display, Fig. 6 is a characteristic diagram showing the figure distortion of the unit display, and Fig. 7 is a characteristic diagram showing the shape distortion of the unit display. The example of the applied example? Figure 8 shows the lens grooves of an example in which Fresnel lenses are applied to the first lens group and the second lens group, and Figure 9 shows the color temperature conversion effect or the color temperature conversion effect in the first lens group. Figure 1O is a lens configuration diagram of an example in which lenses with a heat absorption effect are laminated together. 11121 is a screen configuration diagram when unit displays are arranged in different vertical or horizontal directions, the first
Figure 2 shows the configuration of an embodiment in which a plurality of lenses in the first lens group or the second lens group are molded at the same time, and the joining portion between each lens is used as a connecting means when the unit display is placed in contact with the unit display. The figure is shown below. ■...Light source, 2...First lens group,
2'...First lens group using a Fresnel lens, 3
...Light transmission type display, 4-... Second lens group, 4'... Second lens Cr using an aspherical lens, 4
“...Second lens group using Fresnel lens, 5.
... Screen, 6 ... Unit display, 7 ... Bonded lens, 8 ... Filter film. 1st (Mountain) Figure (b) Tori Z prisoner 3rd circle 5th illustration jz 〼 8 dens ℃ i to human body] Hikari J Higashiuchi &C&,)
See 7 Kunidai? Envy 1Z diagram (0-) (b) Envy 1Z diagram

Claims (1)

[Claims] 1. At least a light source (1), a first lens group (2) having a positive refractive power, a light transmission type display (3), and a second lens group having a negative refractive power. and a lens group (4),
And these are the light source (1) and the first lens group (
2) a plurality of unit displays arranged along the optical path in the order of the light transmission type display (3) and the second lens group (4); a screen (5) arranged a predetermined distance apart and having a screen formed on its surface; and at least the first lens group (2) or the second lens group (4) Transparent display (3
1. A large screen display device characterized in that the display image of ) is enlarged and its graphical distortion is corrected. 2. The large screen display device according to claim 1, wherein the plurality of unit displays are arranged adjacent to each other with respect to the screen (5). 3. In the plurality of unit displays, the first lens group (2) converts the light from the light source (1) into a parallel luminous flux, and the second lens group (4) converts the light from the light transmission type display (3) into a parallel beam. ) is enlarged, and graphical distortion of the display image of the light transmissive display (3) is corrected by at least the first lens group (2) or the second lens group (4). , a large screen display device according to claim 1 or claim 2. 4. The plurality of unit displays are arranged in rows in the vertical and horizontal directions with respect to the surface of the screen (5), and the number of units arranged in the vertical and horizontal directions is different from each other. The large double-sided display device according to claim 1, 2 or 3. 5. The plurality of unit displays include at least the first lens group (2) or the second lens group (2).
5. The large screen display device according to claim 1, wherein either one of the lens groups (4) includes a lens having at least one aspherical surface. 6. The plurality of unit displays include at least the first lens group (2) or the second lens group (2).
Claims 1, 2, 3, wherein either one of the lens groups (4) includes at least a Fresnel lens.
5. The large screen display device according to 4 or 5. 7. Claims 1, 2, and 3, wherein the plurality of unit displays are configured such that the first lens group (2) includes at least one lens having at least a color temperature conversion effect or a heat absorption effect. , 4, 5 or 6. 8. The plurality of unit displays is configured such that the first lens group (2) includes at least one lens whose surface is subjected to a thin film treatment having at least a color temperature conversion effect or a heat absorption effect. The large screen display device according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the large screen display device is 9. The plurality of unit displays includes at least the first lens group (2) or the second lens group (2).
Either one of the lens groups (4), at least one lens therein, is manufactured by molding a plurality of them at the same time,
The large lens according to claim 1, 2, 3, 4, 5, 6, 7, or 8, wherein the joint between the lenses during the molding is configured to serve as a coupling means during the formation of the unit display. Screen display device. 10. Claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, wherein the screen (5) has a concave or convex curved surface in the direction of the optical axis.
The large screen display device described in .