JP2790747B2 - Manufacturing method of liquid crystal display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liquid crystal display device for displaying one image on a plurality of liquid crystal display screens.

[0002]

2. Description of the Related Art Various types of display devices have been used. A liquid crystal display device, which is one of them, has advantages such as a significantly reduced thickness (depth) and a reduced power consumption during driving as compared with a conventionally used cathode ray tube (CRT). In recent years, it has been used in various fields.

The above-described liquid crystal display device employs a structure in which liquid crystal is filled between a pair of transparent electrodes disposed to face each other at an interval of a micron order. For this reason, if fine dust or debris is mixed or adhered in the manufacturing process, the dust or debris or the like does not function properly and so-called pixel defects are likely to occur. In addition, because of the above-described structure, when the display screen is enlarged, pixel defects are more likely to occur and the defect rate increases. The liquid crystal display device in which such a pixel defect has occurred is subjected to processing such as disposal because the display quality is greatly reduced.

Therefore, in a liquid crystal display device, when the size of the screen is increased, the defect rate due to pixel defects increases.
In particular, when the screen size is 15 inches or more, it is extremely difficult to mass-produce at an appropriate cost.

In view of this, a plurality of small liquid crystal display devices having a screen size of 15 inches or less are arranged vertically and horizontally to form a single liquid crystal display device as a whole, thereby increasing the size. FIG. 8A shows an example of such a case.
The three small liquid crystal display devices 1, 1... If this configuration is adopted, for example, if a small liquid crystal display device 1 of 14 inches is used, a large liquid crystal display device 2 of about 42 inches can be manufactured.

Meanwhile, in each of the small liquid crystal display devices 1, as shown in FIG. 8B, there is a non-display portion 1b which does not perform display around a display screen 1a on which an image can be displayed. The non-display portion 1b is a space for forming a sealing portion for confining liquid crystal between two opposing substrates and an electrode for connecting to a wiring for applying a voltage for driving each pixel. Yes, a width dimension of at least about 3 mm is required.

For this reason, as shown in FIG. 8A, the large liquid crystal display device 2 has a grid-like non-display portion 1b between the display screens 1a, that is, the large screen is interrupted (seam). However, there is a disadvantage that display quality is lowered and display error is caused.

In order to solve this drawback, the present applicant has developed a liquid crystal display device having a high display quality, which can display one image formed on a plurality of display screens without interruption, and has already filed Japanese Patent Application No. Hei. 3-293425. FIG. 9 shows the basic structure.

The proposed liquid crystal display device has two or more liquid crystal display elements (in FIG. 9, two liquid crystal display elements 41 and 42 are illustrated), and the display of each of the liquid crystal display elements 41 and 42 is performed. An input end face of an optical fiber bundle 43 for transmitting an image is connected to the screens 41a and 42a, and a composite image having no boundary area is formed at an output end face B of the optical fiber bundle 43.

The optical fiber bundle 43 is formed by laminating a plurality of optical fiber sheets each having a predetermined length and having a plurality of optical fibers arranged in a line, and forming an input end face and an output end face B of each optical fiber sheet. It has a structure in which a fixed part (point E in FIG. 9) in the middle is bent.

[0011]

However, in the above-mentioned liquid crystal display device, the optical fiber bundle 43 for image transmission is used.
Since the output end face B is formed flat, a narrow viewing angle corresponding to the exit angle of the optical fiber is obtained, and there is a disadvantage that an image cannot be viewed even if the viewing angle is slightly changed.

In order to widen the viewing angle, the output end face of the optical fiber bundle is roughened, a scattering plate or a microlens array sheet is arranged on the output end face, and furthermore, one optical fiber is provided. There is a method of processing the output end face of the book into a lens shape. However, in the method using the rough surface processing and the scattering plate, the viewing angle can be increased.However, since the light from the outside is also scattered on the screen as the viewing angle is increased, the image becomes whitish, and the image quality is reduced. There is a disadvantage that it is inferior. Further, the microlens array sheet is expensive and disadvantageous in terms of cost, and the above-mentioned lens-shaped processing is difficult to process and has a drawback that production efficiency is poor, so that it cannot be adequately dealt with.

SUMMARY OF THE INVENTION The present invention is directed to a method of manufacturing a liquid crystal display device in which an optical fiber bundle for transmitting an image is arranged on a display screen of two or more liquid crystal display elements. It is another object of the present invention to provide a method for manufacturing a liquid crystal display device which can increase the viewing angle and also has good image quality.

[0014]

According to the present invention, there is provided a liquid crystal display device comprising :
The manufacturing method has two or more liquid crystal display elements, an input end face of an optical fiber bundle for transmitting an image is connected to each display screen of the liquid crystal display element, and a boundary region is defined by an output end face of the optical fiber bundle. A method for manufacturing a liquid crystal display device configured to form a composite image having no optical fiber, wherein a plurality of optical fibers
By laminating a plurality of optical fiber sheets arranged in rows,
Forming a bundle of varnishes and a mold having irregularities on the surface.
The output end face of the optical fiber is pressed by heating and pressing.
Molding the end face into an uneven shape.
The period of the asperities of the mold is equal to the adjacent light in the optical fiber bundle.
Approximately equal to the pitch of the fiber, thereby achieving the above objective. The method for manufacturing a liquid crystal display device of the present invention includes:
It has two or more liquid crystal display elements, and each of the liquid crystal display elements
The input screen of the optical fiber bundle for transmitting the image
Faces are connected, and a boundary region is formed at an output end face of the optical fiber bundle.
Of a liquid crystal display device configured to form a composite image without
A manufacturing method, wherein a plurality of optical fibers are arranged in a line.
The optical fiber bundle is formed by laminating a plurality of fiber sheets.
Process and a mold with irregularities on the surface
A process of transferring the unevenness to the thin sheet by thermocompression bonding.
And setting the thin sheet on the output end face of the optical fiber bundle.
And the period of the irregularities of the mold is
The pitch between adjacent optical fibers in the optical fiber bundle is approximately
Equally, the object is achieved. Departure
The method for manufacturing a liquid crystal display device of the present invention comprises two or more liquid crystal display elements.
Having an image on each display screen of the liquid crystal display element.
The input end face of the optical fiber bundle for transmitting
Form a composite image without boundary area at the output end face of the fiber bundle
A method for manufacturing a liquid crystal display device having a configuration
Multiple optical fiber sheets in which a number of optical fibers are arranged in one row
Laminating to form the optical fiber bundle;
Transfer the irregularities to a thin sheet using a roller with convexities
And outputting the thin sheet to the exit end of the optical fiber bundle.
Providing the surface with the irregularities of the roller.
Is the pitch of adjacent optical fibers in the bundle.
Switch, which achieves the above objectives.
You.

[0015]

According to the present invention, since the output end face of the optical fiber bundle connected to the liquid crystal display element is formed with irregularities, the output angle of the optical fiber is increased and the viewing angle is increased.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the liquid crystal display of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of the basic structure of the present invention. This liquid crystal display device includes two liquid crystal display elements 21 and 22. Note that the present invention is not limited to two liquid crystal display elements, and a composite image of three or more liquid crystal display elements can be formed by a similar configuration.

The liquid crystal display elements 21 and 22 are arranged side by side with their respective display screens 21a and 22a oriented in the same direction, and the display screens 21a and 22a serving as display input surfaces are arranged side by side.
One end of an optical fiber bundle 23 for image transmission is connected to 22a. The optical fiber bundle 23 is a bundle formed by laminating optical fiber sheets in which several optical fibers 24 are arranged in a line and bonded to each other (FIG. 1 shows the respective optical fibers 24). In this state, the endmost optical fiber 24 of the fiber sheet is visible). FIG. 5 shows an arrangement of the optical fibers 24 in the optical fiber bundle 23. The optical fiber bundle 23 is formed in an inverted Y-shape in which one end side is branched into two on the E surface in the middle, and one end 23a on one end side is
The optical fiber bundle 23 is connected to the display screen (D surface) 21 a at a tilt angle of θ to the liquid crystal display element 22 side.
23b at one end of the display screen is a display screen (D surface) 22a.
Is connected to the liquid crystal display element 21 side at an angle θ.

One end 23a and the other end 23b at one end of the optical fiber bundle 23 are bent at an angle θ on the E plane and merged.
2a. The output end face B, which is the other end face of the optical fiber bundle 23, is formed by arranging optical fibers at a uniform pitch and is formed in an uneven shape (wave shape), thereby forming a large screen. Output end face B
Will be described later in detail.

The two liquid crystal display elements 21 and 22 are driven by a signal obtained by dividing an image signal of each frame into two for right and left fields by a drive circuit (not shown). Therefore, the images displayed on the display screens 21a and 22a are projected on the surface B of the optical fiber bundle 23 without any interruption of the images. Therefore, a large-sized composite screen with good quality is formed.

FIGS. 2A to 2C schematically show the steps of forming the irregularities on the surface B of the optical fiber bundle 23. The output side end surface (B surface) of the optical fiber bundle 23 has irregularities, and the optical fiber sheets constituting the optical fiber bundle 23 are heated and pressed together by a mold 31 having the irregularities mirror-finished. And at the same time, the optical fiber bundle 2
The output end face B of No. 3 is formed into an uneven shape (FIG.
(C)). The unevenness of the mold 31 is caused by the optical fiber bundle 2
3, the output end face shape of the optical fiber bundle 23 is in the thickness direction of each optical fiber sheet as shown in FIG. (X direction in the figure) The shape is such that a convex portion is formed at the center and a concave portion is formed at the end. In this embodiment, the period of the irregularities is the same as the arrangement pitch of the optical fibers. However, the period may be shorter than that. Since the mold 31 is mirror-finished, an irregular shape having a very small surface roughness can be obtained, so that generation of scattered light on the B surface can be prevented.

In FIG. 2, the irregularities on the surface B are shown in FIG.
As shown in (a), the optical fiber bundle 23 is formed so as to be continuous in the thickness direction (the direction in which the optical fiber sheets are stacked) X. In this case, in the thickness direction X of the optical fiber bundle 23
Viewing angle increases. As shown in FIG. 4B, if the irregularities on the surface B are formed to be continuous in the width direction Y of the optical fiber bundle 23, the viewing angle can be increased in the width direction Y of the optical fiber bundle 23.

Also, without forming fine irregularities on the output end face B of the optical fiber bundle 23, a colorless and transparent thin sheet 25 is used as shown in FIG. 31 is heat-pressed to transfer the uneven shape to form a thin sheet 25 having unevenness shown in FIG.
As shown in FIG. 3D, the same effect can be obtained by attaching the thin sheet 25 having the unevenness to the surface B of the optical fiber bundle 23. Thin sheet 25
As shown in FIG. 3B, the transfer of the uneven shape to the surface may be performed using a roller 26 having an uneven surface.

The present invention is not limited to the above-described embodiment, but can be applied to various types of liquid crystal display devices by processing the output end face of the optical fiber bundle to be uneven.

For example, as shown in FIG. 7, the optical fiber bundle 40 is bent at an angle θ on the E plane on the way from the B plane to the D plane, and is split into two branches.
The present invention can also be applied to a liquid crystal device which is bent at the same angle θ in the direction opposite to the plane E on the plane F on the way to the plane.

Although the above embodiment is an example in which the optical fibers 24 are arranged as shown in FIG. 5, the optical fibers 24 are arranged so as to be obliquely adjacent to each other as shown in FIG. The present invention can be applied to an optical fiber bundle.

The above description has been made with reference to the embodiment of the present invention in which an apparatus for converting images of a plurality of liquid crystal display devices into a seamless composite image by transmission using an optical fiber bundle is described with reference to an embodiment. However, the present invention is not limited to the embodiment. Rather, it is a wide range described in the claims.

[0028]

According to the present invention, since the output end face of the optical fiber bundle is provided with irregularities, the viewing angle can be widened, the image can be viewed even when the screen viewing angle is changed, and the image quality is good. This produces an effect that a perfect image can be obtained.

Furthermore, in the present invention, when the output end face is subjected to unevenness processing, the viewing angle can be widened without performing a precise operation such as processing a lens for each optical fiber. Thus, a liquid crystal display device having good image quality can be easily provided. Further, since an expensive material such as a microlens array sheet is not used, there is an effect that it can be provided at low cost.

The direction in which the viewing angle is increased can be easily set to a desired direction depending on the direction of the unevenness processing.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a liquid crystal display device of the present invention.

FIG. 2 is an explanatory view showing a part of a manufacturing process of the liquid crystal display device of the present invention.

FIG. 3 is a plan view showing another embodiment of the liquid crystal display device of the present invention.

FIG. 4A is a perspective view showing a main part of the liquid crystal display device of the above embodiment, and FIG. 4B is a perspective view showing another embodiment of the present invention.

FIG. 5 is a cross-sectional view of the optical fiber bundle used in the above embodiment.

FIG. 6 is a cross-sectional view of an optical fiber bundle having an optical fiber arrangement different from that of FIG. 5;

FIG. 7 is a plan view of another liquid crystal display device to which the present invention can be applied.

FIG. 8A is a front view showing a plurality of display screens provided in a conventional liquid crystal display device, and FIG. 8B is a front view showing one of the display screens.

FIG. 9 is a plan view showing a prior art liquid crystal display device.

[Explanation of symbols]

 21, 22 Liquid crystal display element 21a, 22a Display screen 23 Optical fiber bundle 24 Optical fiber B Output end face

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshio Yoshida 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (72) Inventor Takahiro Miyake 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Sharp Corporation (72) Inventor Yukio Kurata 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation (56) References JP-A-59-210418 (JP, A) JP-A-61-3125 (JP, A) Japanese Utility Model Application Hei 5-55126 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) G02F 1/1347 G02F 1/1335 G02B 6/00

Claims (3)

(57) [Claims] An input end face of an optical fiber bundle for transmitting an image is connected to a display screen of each of the liquid crystal display elements, and a boundary area is defined by an output end face of the optical fiber bundle. A method for manufacturing a liquid crystal display device configured to form a composite image having no optical fiber, comprising:
Stacking several layers to form the optical fiber bundle, and placing a mold having irregularities on the surface on the emission end face of the optical fiber.
By heating and pressing, the emission end face is formed into an uneven shape.
And wherein the period of the irregularities of the mold is adjacent to the optical fiber bundle.
A method for manufacturing a liquid crystal display device , which is substantially equal to a pitch of an optical fiber . (2) Having two or more liquid crystal display elements,
The optical screen that transmits the image is displayed on each display screen of the display element.
The input end face of the fiber bundle is connected to the output end of the optical fiber bundle.
It is configured to form a composite image with no boundary area on the surface
A method for manufacturing a liquid crystal display device, Multiple optical fiber sheets with multiple optical fibers arranged in a row
Stacking several times to form the optical fiber bundle; Heat-press a mold with irregularities on its surface to a thin sheet
Transferring the irregularities to the thin sheet, Providing the thin sheet on the exit end face of the optical fiber bundle
About And The period of the irregularities of the mold is adjacent in the optical fiber bundle
Almost equal to the pitch of the optical fiber, A method for manufacturing a liquid crystal display device. (3) Having two or more liquid crystal display elements,
The optical screen that transmits the image is displayed on each display screen of the display element.
The input end face of the fiber bundle is connected to the output end of the optical fiber bundle.
It is configured to form a composite image with no boundary area on the surface
A method for manufacturing a liquid crystal display device, Multiple optical fiber sheets with multiple optical fibers arranged in a row
Stacking several times to form the optical fiber bundle; Using a roller with irregularities on the surface, remove the irregularities
Transferring to Providing the thin sheet on the exit end face of the optical fiber bundle
About And The period of the concavo-convex of the roller is adjacent to that of the optical fiber bundle.
Almost equal to the pitch of the optical fiber, A method for manufacturing a liquid crystal display device.