JPH06250029A - Liquid crystal plane display device - Google Patents

Abstract

PURPOSE:To make large-screen display by using optical fibers without degrading a contrast by lowering the surface reflectivity of spacers by, for example, forming the spacers of a synthetic resin colored to black. CONSTITUTION:The fiber bundle 11 of the first stage on a liquid crystal panel 9 side is widened in the spacing of fiber sheets 12 by the black sheet-shaped spacer 13 in the transverse direction of the screen on the exit side. The fiber bundle 11 of the second stage on the screen side is widened in the spacing of the fiber sheets 12 by the black sheet-shaped spacer 13 in the longitudinal direction of the screen on the exit side. A plane type light source 8 is used for the back light of the liquid crystal panel 9 and the images formed on the liquid crystal panel 9 are formed in the incident part of the fiber bundles 11 by a lens array 10. The images are magnified by two stages of the fiber bundles 11 provided with the spacers 13. Incident ambient light 15 on the spacers 13 on the exit surface is mostly absorbed by the spacers 13, and the incidence of the light on the exit part 4 does not cause degradation of the contrast.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal flat panel display device, and more particularly to a liquid crystal flat panel display device using an optical fiber to enable a large screen display without lowering the contrast.

[0002]

2. Description of the Related Art In recent years, there has been a demand for a display device with a large screen to provide a realistic sensation along with high-definition broadcasting.
Since the TV is limited in weight and depth, it is impossible to achieve a larger screen than ever before.

Therefore, a so-called projection television for enlarging and projecting with a lens using a liquid crystal panel as a light valve is on the market. However, an optical system for enlarging with a lens has a long optical axis distance by design, and the screen brightness is increased. There is a disadvantage in raising it, and it is inevitable that the volume of the TV becomes large.

In order to solve such a problem, there has been proposed a liquid crystal flat display device for projecting an image of a liquid crystal panel on a large-screen screen by using a large number of optical fibers without using a magnifying optical system lens. (JAPAN DISP
LAY '89 "A Large Scale Optical Fiber Display Usin
g Active Matrix LCD ").

A liquid crystal flat panel display device using an optical fiber as a magnifying means is, for example, as shown in FIG.
A liquid crystal panel 2, a bundle 3 of a large number of optical fibers, and a screen 4, and the light of the point light source 1 is incident on the liquid crystal panel 2 as a backlight, and the fiber bundle 3 is closely attached to the liquid crystal panel 2. The image of the liquid crystal panel is made incident on the incident portion 5, the fiber bundle 3 is transmitted, projected on the screen 4, and the screen 4 is made to emit light.

The pitch of the optical fibers forming the fiber bundle 3 is made coarser at the end on the screen 4 side than the incident part 5 by interposing a spacer between the optical fibers on the screen 4 side. As a result, the light emitting dots 6 of the incident portion 5 become the light emitting dots 7 enlarged on the screen 4, and the image is enlarged and displayed.

[0007]

This large-screen liquid crystal flat panel display device has so far been applied to a large-screen display outdoors for events and the like by making the system of FIG. In order to reduce the thickness of the liquid crystal flat display device as a wall-mounted television for home use, it is necessary to shorten the fiber bundle and arrange a large number of fibers at a uniform pitch. In particular, in order to realize a high-definition display, it is necessary to handle more than several million fibers because the number of fibers required for the liquid crystal panel to be used is greater than the number of pixels.

Further, in this type of liquid crystal flat display device, the spacer used for enlarging the pitch of the optical fibers on the screen 4 side reflects the ambient light incident from the screen 4 side, and lowers the contrast. There's a problem.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a liquid crystal flat display device capable of displaying a large screen without deteriorating the contrast by using an optical fiber. .

[0010]

SUMMARY OF THE INVENTION The present invention is directed to a liquid crystal panel, a screen having a screen larger than the liquid crystal panel, a large number of optical fibers for enlarging and projecting an image of the liquid crystal panel on the screen, and an end portion of the optical fiber on the screen side. In order to achieve the above-mentioned object, a liquid crystal flat display device including a spacer arranged in the above is characterized in that the surface reflectance of the spacer is lowered.

[0011]

In the present invention, the spacer surface reflectance can be lowered by, for example, forming the spacer from a black colored synthetic resin or applying a black paint to the surface of the spacer.

When the surface reflectance of the spacer is reduced,
Ambient light incident on the spacers is absorbed by the spacers, and the reflected light from the spacers is reduced. Therefore, it is possible to suppress or prevent a decrease in contrast due to the reflected light.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid crystal flat panel display device according to an embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the liquid crystal flat display device includes a flat light source 8, a liquid crystal panel 9, and a lens array 1.
0, a two-stage fiber bundle 11, and a screen (not shown). Each fiber bundle 11 is a front view of FIG.
As shown in the plan view of FIG. 1, a large number of fiber sheets 12 in which a large number of fibers are arranged in a sheet shape and a spacer 13 for enlarging the distance between them on the exit side end side are provided.

As shown in FIG. 1, the first liquid crystal panel 9 side
In the fiber bundle 11 of the stage, the spacing of the fiber sheets 12 is widened in the lateral direction of the screen on the emission side by the spacer 13, and the fiber bundle 11 of the second stage on the screen side is the optical path diagrams of FIGS. 1 and 4 on the emission side. As shown in FIG. 1, the black sheet-like spacers 1 in which the intervals between the fiber sheets 12 are arranged in the vertical direction of the screen.
Widened by 3.

In this liquid crystal flat display device, the flat light source 8 is used as a backlight for the liquid crystal 9, and an image formed on the liquid crystal panel 9 is formed by the lens array 10 on the fiber bundle 11 incident portion, and the spacer 13 is formed. The liquid crystal image is enlarged by the two-stage fiber bundle 11 provided with.

As shown in FIG. 4, on the emission side of the second-stage fiber bundle 11, transmitted light 14 is emitted from the fiber sheet to the screen side, and ambient light 15 is incident from the screen side.

This ambient light 15 incident on the spacer 13
, Since the spacer 13 is black, most of it is absorbed by the spacer 13 and the reflected light 16 from the spacer 13 is considerably reduced. This prevents the reflected light from the spacer 13 from entering the screen and lowering the contrast.

[0019]

As described above, in the present invention, since the surface reflectance of the spacer is lowered, most of the ambient light incident on the spacer from the screen side is absorbed by the spacer, and the ambient light is reflected on the surface of the spacer. It is possible to prevent the light from being reflected by and entering the screen, and it is possible to prevent a decrease in contrast due to the light reflected from the spacer. That is,
A large-screen display can be performed by using an optical fiber without lowering the contrast.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a liquid crystal flat panel display device according to an embodiment of the present invention.

FIG. 2 is a front view of an output side end of a fiber bundle according to an embodiment of the present invention.

FIG. 3 is a plan view of an output side end portion of a fiber bundle according to an embodiment of the present invention.

FIG. 4 is an optical path diagram in an emission part of a fiber bundle according to an embodiment of the present invention.

FIG. 5 is a configuration diagram of a conventional example.

[Explanation of symbols]

 8 Flat Light Source 9 Liquid Crystal Panel 10 Lens Array 11 Fiber Bundle 13 Spacer

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[Procedure amendment]

[Submission date] October 6, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

In order to solve such a problem, there has been proposed a liquid crystal flat display device for enlarging and displaying an image on a liquid crystal panel by using a large number of optical fibers without using a magnifying optical system lens. (JAPAN DISPLAY ^ 89 "A La
rge Scale Optical Fiber Display Using Active Matri
x LCD ").

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

A liquid crystal flat panel display device using an optical fiber as a magnifying means is, for example, as shown in FIG.
A liquid crystal panel 2 and a bundle 3 of a large number of optical fibers, and the light of the point light source 1 is incident on the liquid crystal panel 2 as a backlight, and is incident on the incident portion 5 of the fiber bundle 3 which is almost in close contact with the liquid crystal panel 2. The image of the liquid crystal panel is made incident, the fiber bundle 3 is transmitted, and is enlarged and displayed on the emission unit 4.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

The pitch of the optical fibers forming the fiber bundle 3 is made coarser at the end of the emitting section 4 side than the incident section 5 with a spacer interposed between the optical fibers on the emitting section 4 side. As a result, the light emitting dot 6 of the incident portion 5 becomes the enlarged light emitting dot 7 on the emitting portion 4, and the image is displayed in an enlarged manner.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

Further, in this type of liquid crystal flat panel display device, the spacer used for expanding the pitch of the optical fibers on the side of the emitting portion 4 reflects the ambient light incident from the outside and lowers the contrast. There is.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010]

SUMMARY OF THE INVENTION The present invention provides a liquid crystal panel including a liquid crystal panel, a number of optical fibers for enlarging and displaying an image on the liquid crystal panel on a screen, and a spacer arranged between the ends of the optical fibers on the emission side. In a flat panel display device, in order to achieve the above object, the surface reflectance of the spacer is lowered.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

As shown in FIG. 1, the liquid crystal flat display device includes a flat light source 8, a liquid crystal panel 9, and a lens array 1.
0 and a two-stage fiber bundle 11 are provided, and each fiber bundle 1
As shown in the front view of FIG. 2 and the plan view of FIG. 3, 1 is a large number of fiber sheets 12 in which a large number of fibers are arranged in a sheet shape, and a spacer 13 for enlarging the distance between them on the exit side end side. Have.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

As shown in FIG. 4, in the second-stage fiber bundle 11, transmitted light 14 is emitted from the fiber sheet on the emission side, and ambient light 15 is incident from the outside.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

This ambient light 15 incident on the spacer 13
, Since the spacer 13 is black, most of it is absorbed by the spacer 13 and the reflected light 16 from the spacer 13 is considerably reduced. This prevents the reflected light from the spacer 13 from entering the emitting portion 4 and lowering the contrast.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

[0019]

As described above, in the present invention, since the surface reflectance of the spacer is lowered, most of the ambient light incident on the spacer from the outside is absorbed by the spacer, and the ambient light is reflected on the surface of the spacer. It is possible to prevent the light from being reflected and incident on the emitting portion 4 of the fiber bundle, and it is possible to prevent a decrease in contrast due to the reflected light from the spacer. That is, a large screen display can be performed by using an optical fiber without lowering the contrast.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location G09F 9/35 7244-5G

Claims (1)

[Claims] 1. A liquid crystal panel, a screen having a screen larger than the liquid crystal panel, and a fiber bundle composed of a large number of optical fibers for enlarging and projecting an image on the liquid crystal panel on the screen.
A liquid crystal flat display device comprising a spacer arranged between optical fibers at a screen side end of a fiber bundle, wherein the spacer has a low surface reflectance.