JP3063312B2 - Large liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large liquid crystal display device used for a liquid crystal television or the like.

[0002]

2. Description of the Related Art In the case of a large-sized liquid crystal display device used in a liquid crystal television or the like, if the size of the liquid crystal display panel itself, that is, a transparent substrate made of glass or the like constituting a part of the liquid crystal display panel, is increased, the manufacturing apparatus becomes large and the equipment cost increases. Not only that, the yield is reduced. Therefore, in a conventional large-sized liquid crystal display device, for example, as shown in FIG. 5, six liquid crystal display panels 1 are arranged in two rows and three columns on the same plane, and the six liquid crystal display panels 1 are arranged.
There is one that displays one image. Also,
Some of such large-sized liquid crystal display devices have a viewing angle enlargement plate made of ground glass for light scattering arranged on the surface side of the liquid crystal display panel in order to increase the viewing angle.

[0003]

However, in such a conventional large-sized liquid crystal display device, even if a plurality of liquid crystal display panels 1 are arranged close to each other so as not to form a gap between them, the liquid crystal display panels 1 Since the non-display area 2 becomes visible, there is a problem that the image quality is extremely reduced. In addition, when a viewing angle enlargement plate made of frosted glass is used, since the surface of the frosted glass has uneven uneven surfaces, the refraction of the emitted light differs for each pixel, which causes the image to be white, and consequently the contrast to be reduced. There was a problem of extremely lowering. The purpose of this invention is
An object of the present invention is to provide a large-sized liquid crystal display device capable of improving image quality and increasing contrast.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a plurality of transparent thin plates each having a circular arc-shaped head are stacked on a plurality of liquid crystal display panels arranged in the same plane in the thickness direction. A viewing angle magnifying plate in a plate shape is placed, and at least one of the viewing angle magnifying plates adjacent to each other is inclined toward the other viewing angle magnifying plate to form one viewing angle magnifying plate. Is brought into contact with the head of the other viewing angle widening plate.

[0005]

According to the present invention, the viewing angle magnifying plate is formed by laminating a number of transparent thin plates each having an arc-shaped convex surface on the head in the thickness direction thereof. In addition to performing the light guiding function like an optical fiber, the arc-shaped convex surface of the head performs the viewing angle expanding function, so that the viewing angle in the thickness direction of the transparent thin plate can be significantly widened, and moreover, like frosted glass. Since the viewing angle magnifying plate is not used, the image is not whitened, so that the contrast can be increased. Further, at least one of the viewing angle magnifying plates adjacent to each other is tilted toward the other viewing angle magnifying plate so that the head of one viewing angle magnifying plate becomes the head of the other viewing angle magnifying plate. Since the contact is made, there is no gap between the heads of the viewing angle magnifying plate. Therefore, even if a plurality of liquid crystal display panels are arranged at a predetermined interval, the gap between the liquid crystal display panels and the liquid crystal display panel are removed. The non-display area can be made invisible, so that the image quality can be improved.

[0006]

FIG. 1 shows a main part of a large-sized liquid crystal display device according to an embodiment of the present invention. In this large-sized liquid crystal display device, two liquid crystal display panels 11 are arranged side by side at predetermined intervals on the left and right sides of the same plane. In the liquid crystal display panel 11, a sealing material 14 (see FIGS. 3 and 4) is provided around the two transparent electrode substrates 12 and 13, and a liquid crystal 15 (see FIGS. 3 and 4) is sealed therein. In this structure, the polarizers 16 and 17 are disposed on both front and rear surfaces, and a portion corresponding to the surrounding sealing material 14 is a non-display region and the inside is a display region. A backlight 18 is arranged on each of the back surfaces of the two liquid crystal display panels 11, and a viewing angle magnifying plate 19 is placed in a display area on each surface.

The viewing angle widening plate 19 has a structure in which a large number of transparent thin plates 21 made of acrylic resin, polycarbonate, or the like are closely bonded to each other with an isolation film 22 interposed therebetween.
The head 21a of each transparent thin plate 21 has an arc-shaped convex surface, the bottom 21b facing the head 21a is a mirror-like flat surface, and the pair of side portions 21c and 21d along the longitudinal direction are also mirror-like. ing. The isolation film 22 is for blocking an image incident on each transparent thin plate 21 from being incident on an adjacent transparent thin plate 21, and is formed of a thin sheet or a thin film. Specifically, white or black paper or a resin sheet may be used, but the transparent thin plate 21 may be directly adhered by plating, painting, printing, transfer, or the like. Further, in order to effectively reflect the mirror images reflected on the side portions 21c and 21d, a metal reflection film may be used. Such a metal reflection film may be formed of aluminum, nickel, silver, or the like by physical vapor deposition such as vacuum vapor deposition or sputtering. May be deposited. In this case, the metal reflection film is formed on both sides 21 of each transparent thin plate 21.
Although it may be formed on c and 21d, it may be formed only on one side 21c or 21d.

Each of the transparent thin plates 21 is adhered to each other to enlarge the viewing angle plate 1.
In order to obtain 9, each transparent thin plate 21 in which an isolation film 22 such as a metal reflection film is formed on the side portions 21 c and 21 d is brought into close contact with the bottom portion 21 b so as to form one plane, and is adhered with an adhesive or the like. Good. The viewing angle widening plate 19 has a structure in which each transparent thin plate 21 is inclined to some extent with respect to a bottom 21b that forms one plane. The transparent thin plate 21 is different in inclination direction between the left viewing angle widening plate 19 and the right viewing angle widening plate 19, but has the same structure because it is symmetric.
The left viewing angle magnifying plate 19 and the right viewing angle magnifying plate 19 are in a state where the head 21a of the former right transparent thin plate 21 and the head 21a of the latter left transparent thin plate 21 are in close contact with each other. , Is located. In addition, what is higher than the final height of the transparent thin plate 21 to some extent is prepared,
It is also an efficient method to cut the bottom 21b side after the close bonding, and grind the cut surface to a mirror surface. However, the side parts 21c and 21d need to be mirror surfaces before they are closely bonded.

The dimensions of the transparent thin plate 21 are, for example, 80 mm in length corresponding to the size of the liquid crystal display panel 11, 4 mm in height after close contact bonding, and 0.3 to 0.3 mm in thickness.
2.0 mm. The thickness of the transparent thin plate 21 may be equal to or less than the pixel dot pitch of about 0.1 to 0.2 mm. However, if the thickness is larger than the pixel dot pitch, it is easy to manufacture and the cost can be reduced. Also,
The arc-shaped convex surface of the head 21a of the transparent thin plate 21 is a perfect circular convex surface having a radius of about 0.5 to 2 times the thickness.

In this large-sized liquid crystal display device, a number of transparent thin plates 21 having a head 21a having an arc-shaped convex surface are superposed in the thickness direction to form a plate shape.
Since the viewing angle magnifying plate 19 having a structure in which the isolation film 22 is provided on the outer surface of the transparent thin plate 21 between and on both sides is used, each transparent thin plate 21 performs a light guiding function like an optical fiber and its head 21a. The arc-shaped convex surface has a function of enlarging the viewing angle, and the light reflected by the reflection isolating film 22 is reflected by the transparent thin plate 21.
Is emitted from the arc-shaped convex surface, so that the viewing angle in the thickness direction of the transparent thin plate 21 can be significantly widened. In this case, the light is incident on each transparent thin plate 21 and the side 2
The images reflected by 1c and 21d are separated from the adjacent transparent thin plate 21 by the separating film 22, so that they can be clearly recognized. When the isolation film 22 is a metal reflection film, the reflection images by the side portions 21c and 21d become clearer. Further, since a viewing angle magnifying plate such as frosted glass is not used, the image is not whitened, so that the contrast can be increased. Furthermore, a viewing angle expansion plate 1
9 is placed in the display area on the surface of the liquid crystal display panel 11, and the heads 21a of the left and right viewing angle magnifying plates 19 are brought into close contact with each other. Even if they are arranged, the gap between the liquid crystal display panels 11 and the non-display area of the liquid crystal display panel 11 can be made invisible, so that the image quality can be improved.

FIGS. 2 to 4 show the main parts of a large-sized liquid crystal display device according to another embodiment of the present invention.
In these figures, the same reference numerals are given to the same parts as those in FIG. 1, and the description thereof will be omitted as appropriate. In this large-sized liquid crystal display device, six liquid crystal display panels 11 are arranged in two rows and three columns at predetermined intervals on the same plane, and a backlight 18 is arranged on each back side of the six liquid crystal display panels 11. The structure is such that the viewing angle enlargement plate 19 is placed in the display area on each surface of the six liquid crystal display panels 11. The central two viewing angle magnifying plates 19 of the six viewing angle magnifying plates 19
Is a structure in which all the transparent thin plates 21 are erected and are inclined in the direction of approaching each other as a whole, and their adjacent heads 21a are in close contact with each other. The upper left viewing angle magnifying plate 19 has a structure in which all the transparent thin plates 21 are inclined rightward, only the head 21a is upright, and the whole is inclined downward. The portion 21a is in close contact with the head 21a on the left side of the viewing angle magnifying plate 19 on the upper center portion. The lower left viewing angle magnifying plate 19 is
All the transparent thin plates 21 are tilted to the right and only the head 21a is erected, and the entire head is tilted upward. The right head 21a has a lower viewing angle at the center. The head 21a on the left side of the magnifying plate 19 is in close contact with the head 21a on the upper side thereof and the head 21a on the upper side thereof is in close contact with the lower head 21a of the magnifying plate 19 on the upper left. In the upper right viewing angle expansion plate 19, all the transparent thin plates 21 are inclined to the left and only the head 21a is upright,
The head 21a on the left side is in close contact with the head 21a on the right side of the viewing angle magnifying plate 19 on the upper central part. Lower right viewing angle enlargement plate 19
Is a structure in which all the transparent thin plates 21 are inclined to the left and only the portion of the head 21a is erected, and is entirely inclined upward, and the left head 21a is located at the center lower side. The head 21a on the right side of the viewing angle magnifying plate 19 is in close contact with the lower head 21a of the upper right viewing angle magnifying plate 19, while the upper head 21a is in close contact with the head 21a.

In this large-sized liquid crystal display device, since the adjacent heads 21a of the six viewing angle magnifying plates 19 are brought into close contact with each other, the six liquid crystal display panels 11 are arranged at predetermined intervals. Also, the gap between the liquid crystal display panels 11 and the non-display area of the liquid crystal display panel 11 can be made invisible, so that the image quality can be improved in this case as well. Also, all the transparent thin plates 21 of the two central viewing angle magnifying plates 19 are erected, and the head portions 21a of all the transparent thin plates 21 of the left and right two viewing angle magnifying plates 19 are erected. So, for example, in the case of an LCD TV,
When the image is projected in a place where the electric field intensity is weak, the brightness of the screen may change depending on the viewing angle. Such a change in the brightness of the screen can be corrected.

In the above embodiment, the arc-shaped convex surface of the transparent thin plate 21 is a perfect circular convex surface. However, the present invention is not limited to this. For example, an elliptical convex surface or a parabolic convex surface may be used. Also, a composite convex surface combining various convex surfaces such as a perfect circular convex surface, an elliptical convex surface, and a parabolic convex surface may be used. In this case, the arc-shaped convex shape of each transparent thin plate 21 is such that mirror images obtained at the side portions 21 c and 21 d of the transparent thin plate 21 can be sufficiently distinguished from light incident on the adjacent transparent thin plate 21. With this configuration, the isolation film 22 can be omitted.

[0014]

As described above, according to the present invention, a viewing angle expanding plate is used in which a large number of transparent thin plates whose heads are arc-shaped convex surfaces are superposed in the thickness direction to form a plate. Therefore, each transparent thin plate performs a light guiding function like an optical fiber, and the arc-shaped convex surface of its head performs a viewing angle expanding function, thereby greatly increasing the viewing angle in the thickness direction of the transparent thin plate. Since a viewing angle magnifying plate such as frosted glass is not used, the image does not become white and the contrast can be increased.
Further, at least one of the viewing angle magnifying plates adjacent to each other is tilted toward the other viewing angle magnifying plate so that the head of one viewing angle magnifying plate becomes the head of the other viewing angle magnifying plate. Since the contact is made, there is no gap between the heads of the viewing angle magnifying plate. Therefore, even if a plurality of liquid crystal display panels are arranged at a predetermined interval, the gap between the liquid crystal display panels and the liquid crystal display panel are removed. The non-display area can be made invisible, so that the image quality can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a large-sized liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a front view of a main part of a large-sized liquid crystal display device according to another embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along the line BB of FIG. 2;

FIG. 5 is a front view of a part of a conventional large-sized liquid crystal display device.

[Explanation of symbols]

 Reference Signs List 11 liquid crystal display panel 19 viewing angle widening plate 21 transparent thin plate 22 separator

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-129324 (JP, A) JP-A-60-203915 (JP, A) JP-A-60-202422 (JP, A) JP-A-60-202 162282 (JP, A) JP-A-3-2723 (JP, A) JP-A-60-227233 (JP, A) JP-A-3-208001 (JP, A) JP-A-59-210418 (JP, A) JP-A-61-147221 (JP, A) JP-A-61-185785 (JP, A) JP-A-2-39210 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02F 1/1335 G02B 6/04

Claims (6)

(57) [Claims] 1. A viewing angle of a plurality of liquid crystal display panels arranged side by side on the same plane, in which a number of transparent thin plates each having an arc-shaped convex surface are superposed in a thickness direction thereof to form a plate shape. A magnifying plate is placed, and at least one of the viewing angle magnifying plates adjacent to each other is inclined toward the other viewing angle magnifying plate, and the head of one viewing angle magnifying plate is set to the other viewing angle. A large-sized liquid crystal display device characterized by being brought into contact with the head of an enlargement plate. 2. The large-sized liquid crystal display device according to claim 1, wherein an isolation film is provided between said transparent thin plates. 3. The large-sized liquid crystal display device according to claim 2, wherein the isolation film is formed of a metal deposition film. 4. The transparent thin plate has a thickness of 0.3 to 2.0 m.
2. The large-sized liquid crystal display device according to claim 1, wherein the distance is about m. 5. The large-sized liquid crystal display device according to claim 1, wherein the thickness of the transparent thin plate is equal to or larger than the pitch of the pixel dots. 6. The large-sized liquid crystal display device according to claim 1, wherein each of the transparent thin plates constituting the one viewing angle enlarging plate has a head portion upright.