JPH06160887A - Display device - Google Patents

Abstract

PURPOSE:To make a display device thin for forming seamless synthetic pictures from plural display screens which are installed on the device. CONSTITUTION:The input end faces 3a and 3b of bundles of optical fibers 3 and 3 for transmitting the picture are connected with respective display screens 1a and 2a of two liquid crystal display elements 1 and 2. Since the display screens la and 2a are installed stepwise so that non-display parts may overlap each other, the bundle of optical fibers 3 can be made thinner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for obtaining a seamless composite image from a plurality of display screens.

[0002]

2. Description of the Related Art Conventionally, a plurality of relatively small image display elements such as liquid crystal display elements are arrayed vertically and horizontally to form a single display device, thereby increasing the size of the screen. ing.

FIG. 3 shows a conventional display device having a large screen using a small liquid crystal display element. This display device has a display screen 101 of each liquid crystal display element 101, 102.
a, 102a (C surface) are connected to the input end faces 103a and 103b of the optical fiber bundle for transmitting an image, and an image can be formed so that a boundary region does not occur at the output end face (A surface) of the optical fiber bundle. There is.

[0004]

By the way, generally, in a liquid crystal display device, there is a non-display portion d as shown in FIG. Therefore, when two such liquid crystal display elements are arranged, the interval between the non-display portions becomes 2d, as shown in FIG. Here, when the bending angle of the optical fiber bundle is θ and the thickness of the linear portion on the output end face (A face) side is s, the thickness h of the optical fiber bundle is obtained by h = s + d / tan θ.

Here, in order to be thin, it is necessary to reduce the thickness h of the optical fiber bundle to achieve a total thinning. However, if the bending angle θ is increased to a certain value or more in order to reduce the thickness h of the optical fiber bundle, the directivity of the images from the left and right liquid crystal display elements becomes large, and the obtained composite image becomes unnatural. Further, the thickness s of the straight line portion is determined according to the bending angle θ in order to reduce the difference in the directivity of the images from the left and right liquid crystal display elements. Since the bending angle θ and the thicknesses s and d are determined by the liquid crystal display element, it is difficult to reduce the thickness h of the optical fiber bundle to reduce the thickness of the display device.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a thin display device capable of forming a seamless composite image from a plurality of display screens. .

[0007]

A display device according to the present invention has a plurality of image display elements, and an input end face of an optical fiber bundle for transmitting an image is connected to each display screen of the image display elements. In a display device that forms a composite image so that there is no boundary area at the output end face of an optical fiber bundle, adjacent image display elements are arranged such that their non-display portions are overlapped and the positions in the depth direction are different, An optical fiber bundle having an input end face connected to the display screen of the image display element is provided with its output end face arranged on the same plane, thereby achieving the above object.

[0008]

The image display element connected to the input end face of each optical fiber bundle is arranged so that the position is different in the depth direction and the non-display portions overlap. For this reason, the interval between the apparent non-display portions is narrowed, and the thickness of the optical fiber bundle can be reduced. Therefore, the display device can be thinned.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of the display device of the present invention. This display device includes two liquid crystal display elements 1 and 2. A display screen 1a which is a display input surface,
Each of 2a has a non-display portion d, and the non-display portions are arranged so as to overlap each other. And the display screen 1a,
2a respectively include optical fiber bundles 3 and 3 for image transmission.
The input end faces 3a and 3b of are connected.

The optical fiber bundles 3 and 3 are formed by adhering a plurality of optical fibers 4 arranged in a line to form an optical fiber sheet, and stacking the optical fiber sheets into a block shape. It is bonded so as to form an inverted Y shape that is branched into two. The input end face 3a of one optical fiber bundle 3 is connected to the liquid crystal display element 2 side with respect to the display screen 1a (C face) by an angle θ,
The input end face 3b of the other optical fiber bundle 3 is displayed on the display screen 2
The liquid crystal display element 1 is connected to the liquid crystal display element 1 side at an angle θ with respect to a (D surface).

The output end faces of the optical fiber bundles 3 and 3 are bent at an angle θ on the B-face and merge to form a display screen 1.
They are provided on the same plane and are oriented in the direction perpendicular to a and 2a. Then, on the output end surface (A surface) of the optical fiber bundle 3, the optical fibers 4 are arranged at a uniform pitch.

In the above display device, the bending angle of the optical fiber bundles 3, 3 is θ, the thickness of the straight line portion on the output end face side is s, the interval between the non-display portions of the liquid crystal display element is d, and the thickness of the liquid crystal display element is t. Then, the thickness h1 of the optical fiber bundle is h1 = s + t + d / (2tan θ), and the thickness h2 of the display device main body is h2 = h1 + t, so that h2 = s + 2t + d / (2tan θ).

In the conventional display device, the thickness h'is h '= s + t + d / tan θ.

Therefore, when 2t × tan θ <d, h2
It becomes <h ', and the thinning of the display device can be achieved.

Generally, the bending angle θ of an optical fiber bundle is
In order to prevent the synthetic image from being unnatural due to the difference in the directivity of the images from the left and right liquid crystal display elements, θ ≦
It is preferably 25 °. Therefore, when t <d, h2
<H '.

The thickness t of the liquid crystal display element is usually about 3 mm. On the other hand, the distance d between the non-display portions is such that a sealing portion for sealing the liquid crystal between the two substrates facing each other and a wiring for forming a driver or wiring for driving each pixel. It is a space for forming, and about 3 mm is required only for the sealing portion. Including a driver and the like, about 15 mm to 20 mm is necessary even for a small liquid crystal display device of about 4 inches. From this, the above condition of t <d is satisfied.

In this display device, since the liquid crystal display elements 1 and 2 are arranged so as to overlap each other, the width W can be reduced, and further, the non-image portion of the display device can also be reduced.

The present invention is not limited to a display device using two image display elements, and a composite image using three or more image display elements is also possible.

[0020]

As is apparent from the above description, according to the present invention, the interval between non-display portions can be narrowed. Therefore, the optical fiber bundle can be formed with a small thickness, and the display device can be thinned. Further, since the image display elements are provided so as to overlap with each other, the non-image portion of the display device can be made small.

[Brief description of drawings]

FIG. 1 is a plan view showing a display device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a non-display portion of a liquid crystal display element.

FIG. 3 is a plan view showing a conventional display device.

[Explanation of symbols]

 1, 2 Liquid crystal display element 1a, 2a Display screen 3 Optical fiber bundle 4 Optical fiber

Claims (1)

[Claims] 1. An input end surface of an optical fiber bundle for transmitting an image is connected to each display screen of the image display elements, and an output end surface of the optical fiber bundle has no boundary area. In a display device that forms a composite image on, the adjacent image display elements overlap their non-display parts, and
Optical fiber bundles arranged at different positions in the depth direction and connecting the input end face to the display screen of each image display element,
A display device in which its output end face is arranged on the same plane.