WO2006042735A2

WO2006042735A2 - Monitor comprising a glass fibre projector for large-screen representation, and method for the production thereof

Info

Publication number: WO2006042735A2
Application number: PCT/EP2005/011158
Authority: WO
Inventors: Manfred Vierling; Michael J. Pabst
Original assignee: Nova Informationstechnik Gmbh
Priority date: 2004-10-19
Filing date: 2005-10-17
Publication date: 2006-04-27
Also published as: EP1812924A2; WO2006042735A3; DE102004051062B4; DE102004051062A1

Abstract

Various embodiments of display devices exist for the optical reproduction of alphanumeric and/or graphical representations for different applications. The disadvantage of known display devices is that the means for enlarging the image between the entrance plane and the emergence plane are very costly, especially for lenses and mirrors, and the association of the pixels in the X plane and the Y plane must be exact, in order to avoid geometrical distortions. The aim of the invention is to provide a monitor which enables large-screen representation and can be economically produced. To this end, the inventive monitor comprises the following elements: an image-producing element (2), a plurality of optical waveguides (3), each pixel of the image-producing element (2) being connected to one of the optical waveguides (3), a screen (4), each pixel (45) of the screen (4) being connected to one of the optical waveguides (3), and an electronic control system (1) which is connected to the image-producing element (2). The association of the pixels (45) of the image-producing element (2) is carried out according to pixels scanned on the screen (4). The invention can be applied to the field of entertainment electronics or to the display-producing industry.

Description

"Monitor with glass fiber projector for large-screen display and method for its production"

description

The invention relates in the first place to a monitor for large image display according to claim 1. Furthermore, the invention relates to a method for producing a monitor according to claim 7.

Monitors with fiber optic projector have long been known. For example, EPO 101 112 Bl discloses an image transmission apparatus having at least one image display device and an image intensifier (glass fiber projector) consisting of a stack of single-layer fiber tapes and having a substantially rectangular entrance window and a substantially rectangular exit window the axial distance between the individual fibers in two orthogonal directions at the exit window is greater than that at the entrance window. In detail, the entrance window is arranged in a plane which is substantially parallel to a plane perpendicular to the exit window and in this vertical plane the first side or a second side of the exit window is arranged perpendicular to the first side. The exit window is formed by a window plate having a light-absorbing surface, and this window plate is formed with openings in which the fiber ends are arranged. The window panel includes a stack of strips having a light absorbing surface in or on which the fiber ends are disposed, the fiber ends being provided with an anti-reflective coating and waved on the side of the exit window in at least one direction parallel to that of the rectangle sides of the exit window , Alternatively, it can be provided to arrange on the exit window a transparent plate, wherein the spaces between the fiber ends and the Plate are filled with a paste whose refractive index is equal to the refractive index of the plate. In this embodiment, this plate can be formed wave-shaped on the side facing the exit window, wherein this wave formation extends parallel to one of the orthogonal sides of the exit window and is provided with an antireflecting coating on the side facing away from the exit window. At the exit window, the fibers may be compressed such that there is no space left between the fibers, the fibers being provided with a light absorbing coating and an anti-reflective coating. In all embodiments, the display assembly includes three picture tubes illuminated in red, green and blue, a two-color mirror device and a lens system, and the two-color mirror device and the lens system focus the three images on the exit window. In this case, the image display tube can be provided with a glass fiber window plate and the image display device is formed by a controllable light modulator.

Furthermore, from DE 40 16 967 Cl a device for large-screen display by addressing a number of monitors known, each pixel of the monitor screen is connected to the corresponding pixel of a projecting beyond the monitor screen flat and rectangular display surface by means of glass fibers and on all sides of this protruding display area more monitors are accurately connected. In order to obtain large seamless display areas, ie to avoid that the large image is visibly composed of individual bordered rectangular images, it is proposed in detail each pixel of the picture tube surface of the monitor with the corresponding pixel of a projecting beyond the picture tube edges of the monitor, flat and rectangular display area to connect by means of glass fibers. This coupling surface corresponds in shape to the surface of the cathode ray tube, while the display surface is flat. These areas are z. B. produced by grinding the resulting from the glued glass fibers intent block, which is screwed with an adjustable device to the monitor. The image sharpness can be fully retained by the optical fibers or glass fibers, wherein the point resolution is somewhat reduced due to the larger display area compared to the coupling surface. The glass fibers are - as already mentioned glued together, preferably to individual bundles and at the four on the picture tube edges protruding strips of the display area now more monitors can be connected with pinpoint accuracy.

Furthermore, from DE 44 15 782 Al a method and apparatus for the construction of rigid, and flexible and thus spontaneously deformable screens are known, which are able to emit high light intensities, without optical edge distortions and can be made very flat and which mechanical Insensitive to stress, as well as the same side can send and receive a picture. For this purpose, individual glass fibers are combined to form lines and line layers, and each individual optical fiber is used to display a pixel on the screen. In order to produce a flat screen, the glass fibers are also glued or fused together next to rows and on this first line of glass fiber or glass fiber, another is glued or melted. This is repeated until the desired number of layers and layer width has been achieved. Thereafter, the ends are cut by cutting, saw to a uniform length. If the glass fibers are glued together, the layer thickness serving to distance the To determine fibers to each other, whereby different light spot sizes are generated on a screen. To stabilize and change the optical properties of this glass fiber surface is glued or melted a translucent base plate, which is anti-reflective and slightly diffuse to avoid light reflections. In this case, a rigid plate, for. B. a glass plate, or a flexible plate, z. B. plastic, can be used. This then allows the construction of a flexible screen. The principle of the screen uses the Lichtleitfahigkeit of the glass fiber, so that at one end per glass fibers, a screen light point can be irradiated and visible at the other end of the light spot on the base plate Each individual, merged into rows and lines surfaces, glass fibers is z , As laser or brown tube, as in a conventional screens with shadow mask, the pixels, addressed or scanned. The individual glass fibers can, depending on the intended use, have different cross-sections Round and hexagonal cross-sections have proven to be very versatile, but it is also possible to choose square, diamond-shaped or triangular or polygonal cross-sections. Especially the hexagonal cross sections are suitable for the construction of screens whose individual points of light have no edge to the adjacent light point. The other end (Einstrahlende) has different embodiments depending on the purpose. If, for example, brown tubes (electron irradiation) are used to generate the light spot on the screen, then the glass fiber radiating ends can be concave in or configured in the form of a partially open hollow sphere.

A light exit body for fiber optic light guides, in particular for signal display devices for displaying traffic signs, is known from EP 0580 942 A1. To increase the beam angle to achieve a uniform high light intensity over the entire angular range, a tapered extension portion is provided at the outlet end of the light exit body, whereby not only the desired broadening of the emission angle is achieved, but also over the entire effective angle range uniform, high light intensity with a sharp drop in light intensity towards larger angles. The central region of the light exit body, in which the light is guided from the inlet to the outlet end, widens in a substantially conical or pyramidal manner towards the outlet end. This means that not only the preferred truncated cone shape of the central region leads to the effect according to the invention, but also other geometric shapes that are close to the truncated cone shape, such as a truncated pyramid with regular or irregular polygon as a base, a truncated cone with a round cut surface, but with a Base with any shape, for example, to achieve a desired asymmetry in the angular distribution of the radiation, including the latter may be desirable if one wants to achieve an angular distribution of the radiated light, which is not rotationally symmetrical This may for example be the case when in a signal display device of Beam angle in the horizontal direction is relatively wide, but in the vertical direction should be limited to the eye level of an observer, whereby light loss up and down are avoided.

In the aforementioned technical field, EP 0 415 026 B1 discloses a signal arrangement with a lamp arranged in a lamp housing, and with a radiator which is distant therefrom, with a windshield and a light transmission device arranged between the lamp housing and the radiator. To use the light beams fed through a bundle of optical fibers, a large area To create signal image, which is well visible from different positions and long distances and inexpensive to produce from a few parts, is assigned in each of each the radiator end facing each light guide, a separate, independent, transparent lens on the light exit side as a Fresnel lens or Fresnel lens is formed and in the finite focal point, the end of a light guide is arranged. The outer diameter of the lens corresponds to an enveloping circle diameter of the light bundle at a distance corresponding to the focal length from the light exit surface, wherein the lenses are formed approximately hyperbolic or kugelkalotten- or parabolic. The lenses are associated with their convex side of the side of the end of the light guide and in the beam cross section, in particular on the side facing the lens of the front screen, at least one Umlenklinse arranged with a light beam bundle and at a deflection angle to an optical axis of the lenses is distracted. These deflection lenses have cylinder barrel surfaces or spherical cap surfaces facing the optical fiber ends. It is thereby achieved that a portion of the light beams in an angular direction can be derived from the light beam emerging from the signal arrangement or its radiator, in order to be able to correctly recognize the signal image from different positions and / or distances to the signal arrangement. Above all, recognizing the signal image from a position laterally adjacent to the signal arrangement is also easily achieved from small distances from the signal image. In addition, the arrangement of many small lenses which are each associated with a light guide end, the formation of mirror and phantom images can be prevented simultaneously without additional measures. Finally, from EP O 397 917 Bl a display device for alpha-numeric displays with a display panel is known in which an activated light source illuminates a bundle of optical fibers and in each leading via an optical fiber to a display element of a coordinate point light path, via a Control line controllable switching element is inserted, with which the assigned light path is either releasable or lockable. In order to increase the possibilities of variation of the display device, each coordinate point has n display elements and the display elements are arranged in n nested matrices, wherein the bundles of optical fibers are each assigned to a matrix and the control lines are matrix-individually, so that simultaneously n numeric displays can be displayed. The number of matrices determines the number of colors in a display. In addition, n displays can be displayed independently of each other on the scoreboard, if only certain sections of the scoreboard are assigned to it via the control of the switching elements. For this purpose, each matrix of the switching elements can be assigned a partial control circuit, via which each switching element of the matrix can be controlled individually, and the partial control circuits can be controlled by the control unit according to the desired display or partial displays. The control commands for the control unit can be contained in a programmable memory, which then predefined the most diverse displays, can be retrieved as needed and displayed. The switching elements can also be designed as a rotatably mounted and electrically operable by means of a coil flap. The training as a filter for the light waves is possible. The transmission characteristics of the filters can be changed magnetically, electrically or thermally. For this purpose, in particular designed as a liquid crystal switching elements. As the above appreciation of the prior art shows, differently designed display devices for optical reproduction of alphanumeric and / or graphical representations for various applications are known. A disadvantage of these known display devices is that the means for image magnification between entrance and exit levels are very expensive, especially for lens and mirror, and that the assignment of the pixels in the X and Y plane must be exact in order to avoid geometric distortions. Therefore, in practice, inexpensive display devices are lacking, which permit both an arbitrary allocation of the pixels and also permit extensive flexibility. This is particularly important because the consumer electronics or display device manufacturing industry is considered to be a highly advanced, development-friendly industry that is quick to pick up on and make improvements and simplifications.

The invention has the object of providing a monitor in such a way that it allows a large image display and is inexpensive manufacturable.

This object is achieved in a monitor for large-screen display according to claim 1, which has:

An imaging element,

A plurality of optical waveguides, each pixel of the imaging element being connected to one of the optical waveguides,

A screen, each pixel of the screen being connected to one of the optical fibers, • And connected to the imaging element control electronics, wherein in accordance with the screen scanned pixels, the assignment of the pixels of the imaging element takes place.

The monitor according to the invention has the advantage that in a surprisingly simple and cost-effective manner, a free allocation of the pixels of the imaging element and the pixels of the screen is made possible, so that the screen can be adapted to any technical need. For the line-by-line representation of the images, all systems such as PAL, SECAM, etc. can be used, but it is not necessary to select a line by line representation of individual pixels. The monitor is therefore highly flexible and can be adapted to all existing standards. Finally, the monitor as a passive optical element on a very long life and is as a flat display surface with a small depth, for example, 12 cm, executable. '

Furthermore, this object is achieved in a method for producing a monitor with a glass fiber projector, consisting of an imaging element, a plurality of optical waveguides, a screen and connected to the imaging element control electronics for large image display according to claim 7, wherein:

• using a screen scanner, the pixels are scanned on the screen,

• with a comparator connected to the screen scanner and imaging element, the position of each pixel of the Screen compared with the associated pixel of the imaging element and a correction value is derived therefrom and • with in a memory area of the control electronics correction values, the pinpoint mapping and mapping is made.

The inventive method according to claim 7 has the advantage that the monitor is automatically produced in a surprisingly simple and cost-effective manner with a few steps and that during assembly or adjustment no complicated assembly or adjustment is required. This is due to the fact that by means of the control electronics, the individual pixels in the X-Y direction are displaced and that by parallel processing, e.g. line by line, the adjustment process can be done in a short time.

In a further development of the invention, according to claim 3, the screen of a projection screen and a glass body, each optical fiber is connected via a magnifying calender to the screen. In particular, according to claim 4, the enlargement calender is designed as a shape of the optical waveguide or the glass body.

This development of the invention has the advantage that, on the one hand, a corresponding enlargement is achieved by the enlargement calender and, on the other hand, that the bonding of the optical waveguide does not require exact positioning.

Preferably, according to claim 5, the projection screen and the glass body are arranged in a receptacle which - according to claim 6 i

- Has a suction nozzle for generating negative pressure in the recording.

This allows for secure positioning during assembly as well as a compact and robust design, resulting in a longer life, which is often desirable and important.

Finally, in a further development of the invention, according to claim 8, for a screen consisting of a projection screen and a glass body, these are inserted into a receptacle and held together by negative pressure in the recording.

This development of the invention has the advantage that on the one hand by the negative pressure a planar suction of the ground flat surfaces is achieved and that on the other hand by the negative pressure in the intake or the suction, the two parts are reliably held together permanently. For assembly, all items can be mounted on the receptacle, without turning or turning the recording is required, so that the assembly times can be significantly shortened. Further advantages and details can be taken from the following description of preferred embodiments of the invention with reference to the drawing. In the drawing shows:

FIG. 1 the monitor according to the invention as a block diagram to illustrate the adjustment process,

FIG. 2a and

FIG. 2b in side view of the screen of the monitor according to the invention in the disassembled and assembled state and FIG. 3 a and

FIG. 3 b shows an embodiment of the screen in section and in plan view.

FIG. 1 to FIG. 3b show the monitor according to the invention for large-screen display with an imaging element 2 and a plurality of optical waveguides 3. Each optical waveguide 3 is connected on the one hand to a pixel of the imaging element 2 and on the other hand to a pixel 45 of the screen 4. A control electronics 1 is connected to the imaging element 2, wherein according to the invention in accordance with the screen 4 scanned pixels 45 (or x _b , y _b ), the assignment of the pixels (x _a , y _a ) of the imaging element 2 takes place. For this purpose, the control electronics 1 has a memory area 7 for storing correction values which are determined by a comparator 6 connected to the imaging element 2 and a screen scanning device 5.

The screen 4 preferably consists of a projection screen 41 and a glass body 42, each optical waveguide 3 being connected to the screen 4 via a magnification dome 33. The enlargement calotte 33 is preferably designed as a configuration of the optical waveguide 3 or of the glass body 42.

Specifically, the projection screen 41 and the glass body 42 are arranged in a receptacle 43 and the receptacle 43 has a suction nozzle 44 for generating negative pressure in the receptacle 43.

The monitor according to the invention is structurally simple constructed using fewer items, allows a rational, automatic Installation practically in one operation and is therefore inexpensive to produce. As a passive optical element, the monitor has a very long service life, has a high degree of flexibility and can be adapted to all existing standards as a result of the free assignment of the pixels of the imaging element 2 and the pixels 45 of the screen 4. The feed is flat and direct (ie without light losses) and by grinding or polishing reflections are reliably avoided. Furthermore, it is advantageous that a reprogramming to another standard or the removal of optical defects by software by means of control electronics 1 and memory area 7, ie without hardware change, can be done.

In a further development of the invention, for example webs can be arranged between the enlargement calender 33, in order to enable positioning during bonding of the optical waveguide 3 or to prevent sinking into the intermediate space of the enlargement calotte 33 u; by a modular arrangement of various monitors according to the invention is virtually an arbitrarily large and flexibly configurable display area can be built; the projection screen 41 and / or the base body 42 (with the embedded optical waveguides 3) can be made rigid or flexible; for the color representation, a polychromatic light source and only an optical fiber system 3 or a triple optical fiber system 3 may be used; the permanent suction of the projection screen 41 and the base body 42 can be improved by a concave and / or flexible configuration of contiguous edge regions of the projection screen 41 and / or the base body 42 u.a ..

Claims

claims

1. Monitor for large image display with

An imaging element (2),

A plurality of optical waveguides (3), each pixel of the imaging element (2) being connected to one of the optical waveguides (3),

A screen (4), each pixel (45) of the screen (4) being connected to one of the optical waveguides (3),

• and one with the imaging element (2) connected control electronics (1), wherein in accordance with the screen (4) scanned pixels (45), the assignment of the pixels of the imaging element (2).

2. A monitor according to claim 1, characterized in that the control electronics (1) a memory area (7) for storing correction values which are determined by a comparator (6) connected to the imaging element (2) and a Bildschirmabtastgerät (5), having.

3. A monitor according to claim 1, characterized in that the screen (4) consists of a projection screen (41) and a glass body (42), each optical waveguide (3) via a magnifying calotte (33) to the screen (4) is connected ,

4. A monitor according to claim 3, characterized in that the enlargement calotte (33) is configured as a shape of the optical waveguide (3) or of the glass body (42).

5. A monitor according to claim 3, characterized in that the projection screen (41) and the glass body (42) are arranged in a receptacle (43).

6. A monitor according to claim 3, characterized in that the receptacle (43) has a suction nozzle (44) for generating negative pressure in the receptacle (43).

7. A method for producing a monitor with a glass fiber projector, consisting of an imaging element (2), a plurality of optical waveguides (3), a screen (4) and connected to the imaging element (2) control electronics (1) for Large picture display, in which

With a screen scanning device (5) the pixels (45) are scanned on the screen (4),

Comparing the position of each pixel (45) of the screen (4) with the associated pixel of the imaging element (2) with a comparator (6) connected to the screen scanner (5) and imaging element (2), and deriving therefrom a correction value, and

• with in a memory area (7) of the control electronics (1) contained correction values, the pinpoint mapping and assignment is made.

8. The method according to claim 6, characterized in that for a screen (4) consisting of a projection screen (41) and a glass body (42), this in a receptacle (43) inserted and held together by negative pressure in the receptacle (43) become.