EP0169861A1 - Optical fibre picture screen - Google Patents

Abstract

The spaced light output ends of a bundle of optical fibers, the light input ends of which are clamped and arranged in a helical line and are illuminated by a projection lamp, form a flat screen. The transparency of a light valve ring placed before the light input ends is superficially modulated by means of a laser beam deflected by a rotating mirror.

Description

Optical fiber screen

The invention relates to an optical fiber flat screen.

Screens, the flat design of which is made possible by the fact that a rotating light positioned in the densely packed inlet ends of an optical fiber bundle passes through the fibers and generates the desired image as they emerge from the fanned light outlet ends of the fiber bundle, are known as US Pat. No. 4,085,420.

The use of flat screens of the type described is limited to large-screen applications because the argon-ion lasers that are suitable for them are bulky and expensive and have a low efficiency.

The object of the invention is to make it possible to use highly efficient semiconductor diode lasers of small design in the infrared range for optical fiber flat screens.

This is achieved in that a light valve, designed as a thin-walled hollow cylinder, is placed directly in front of the light entry ends of the optical fibers. The modulated infrared diode laser beam creates a fine grid of transparent and non-transparent zones in accordance with the image content in the light valve.

A projection lamp radiates visible light through the light valve into the optical fibers, which can be provided with color filters at the exit end for the purpose of displaying colors.

Smectic liquid crystals or iron garnet are suitable as light valve materials whose transparency for visible light can be surface-modulated by focused infrared laser light.

International office

INTERNATIONAL APPLICATION PUBLISHED AFTER THE INTERNATIONAL COOPERATION AGREEMENT IN THE PATENT AREA (PCT)

(51) International Patent Classification 4 (11) International Publication Number: WO 85/033 H04N 3/02, 9/14 A3 (43) Internationales

RELEASE DATE: August 1, 1985 (Aug 8, 1985

(21) International file number: PCT / DE85 / 00024 (88) Date of publication of the international search report:

(22) International filing date: September 12, 1985 (September 12, 1985

January 29, 1985 (1/29/85)

(31) Priority record number: P 3403 057.3

(32) Priority Date: January 30, 1984 (1/30/84)

(33) Country of priority: DE

(71) (72) Applicant and inventor: STUKENBROCK, Heiner [DE / DE]; Niedersachsenstr. 40, D-3012 Langenhagen 1 (DE).

(81) Destination countries: AT (European patent), AU, BE (European patent), BR, CH (European patent), DE (European patent), FR (European patent), GB (European patent), JP, LU (European Patent), NL (European patent), SE (European patent), SU, US.

(54) Title: OPTICAL FIBER PICTURE SCREEN

(54) Description: LICHTFITERFIBERScreen

(57) Abstract

The light outlet spread out ends of an optical fiber bundle of which the close light inlet ends arranged on a helic line are eliminated by a projection lamp, form a flat screen. The transparency of a light valve ring arranged before the lig inlet ends is superficially modulated by means of a laser beam deviated by a rotating mirror.

(57) Summary

The fanned out light exit ends of an optical fiber bundle, the densely packed light entry ends of which are never arranged on a screw are illuminated by a projection lamp, form a flat screen. D Transparency of a light valve ring placed in front of the light entry ends is surface-modulated by a laser beam deflected by means of a rotating mirror. ONLY FOR INFORMATION

Code used to identify PCT contracting states on the headers of publications that publish international applications in accordance with the PCT.

AT Austria FR France ML Mali

AU Australia GA Gabon MR Mauritania

BB Barbados GB United Kingdom MW Malawi

BE Belgium HU Hungary NL Netherlands

BG Bulgaria rr Italy NO Norway

BR Brazil JP Japan RO Romania

CF Central African Republic KP Democratic People's Republic of Korea SD Sudan

CG Congo KR Republic of Korea SE Sweden

CH Switzerland LI Liechtenstein SN Senegal

CM Cameroon LK Sri Lanka SU Soviet Union

DE Germany, Federal Republic of LU Luxembourg TD Chad

DK Denmark MC Monaco TG Togo

FI Finland MG Madagascar US United States

Claims

Expectations

1) Optical fiber flat screen, characterized in that the light exit ends of the fibers of an optical fiber bundle form the picture elements of the image area, while the light entry ends of the optical fibers in a helix on the inner surface of an imaginary hollow cylinder. are arranged, and that the transparency of a light valve ring placed in front of the light entry ends of the optical fibers by means of a laser beam directed and time-modulated from an axial direction in the direction of the optical fibers by means of a rotating mirror rotating in the center of the cylinder, the axis of rotation of which is the same or almost the same as that of the image surface normal is surface-modulated, and in that an image is generated in the image surface by illuminating the light valve ring with light from a projection lamp placed inside the light valve ring.

2) Optical fiber screen according to claim 1, characterized in that the light entry ends of the optical fibers are arranged on the inner surface of an imaginary hollow body, the radius coordinates are variable in a cylinder coordinate system in the axial or angular direction.

3) optical fiber flat screen according to claim 1 and 2, characterized in that the light entry ends of the optical fibers are not arranged on a closed ring surface but on a section of such a surface.

4) Optical fiber flat screen according to claim 1, 2 and 3, characterized in that the area in which the light entry ends of the optical fibers are arranged, the limit case of the curved surfaces according to claim 1, 2 and 3, namely a flat surface perpendicular or almost perpendicular to the image surface forms. 5) optical fiber flat screen according to claim 1, 2, 3 and 4, characterized in that the light input fiber ends belonging to a plurality of adjacent image lines are arranged in succession on a passage or part of a passage of a helical line.

6) Li ch tl eitfaserf flat screen according to claim 3, 4 and 5, characterized in that the direction from which the laser light falls on the rotating mirror is different from the rotating axis direction and that the rotating mirror is a faceted mirror.

7) Optical fiber flat screen, according to claim 1, 2, 3, 4, 5 and 6, characterized in that a plurality of ring segment-shaped ring valves form a ring or part of a ring, and that optical fibers placed in the spaces between the ring segments are not for the image surface, but for Control purposes are led to light sensors.

8) optical fiber flat screen according to claim 1, 2, 3, 4, 5, 6 and 7, characterized in that the light of the

Projection lamp is illuminated before leaving the image area, so that color triple arises in an arrangement similar to that of a color television picture tube.

9) Optical fiber flat screen according to claim 1, 2, 3, 4, 5, S, 7 and 8, characterized in that the light valve or the light valves are not arranged in front of the light entry ends of the optical fibers, but in front of the light exit edges of the optical fibers, so that the laser light passes through the optical fibers.