WO2001017273A1

WO2001017273A1 - Method and the device for generating moving and still full-colour images

Info

Publication number: WO2001017273A1
Application number: PCT/HR2000/000030
Authority: WO
Inventors: Mario BOJIĆ
Original assignee: VUČKOVIĆ, Branko
Priority date: 1999-09-02
Filing date: 2000-08-28
Publication date: 2001-03-08
Also published as: SI20393A; AU6715800A

Abstract

Subject of the invention is a method and a device for generating moving and still full-colour images using modulated laser beams (12, 13, 14) of red, blue and green colour combined into a single light beam (16) divided and directed through spacial optical system (19) to the flat screen (23). Method and device for generating moving and still full-colour images enables that modulated multicolour laser beams (12, 13, 14) combined into angular shape (18), using reflecting prisms (19a1...19an) in the optical system (19) for division to n angular light shapes (21), are via reflecting surfaces (19b1...19bn, 19c1...19cn, 22) appropriately moved and directed to the displaying surface (23).

Description

METHOD AND THE DEVICE FOR GENERATING MOVING AND STILL FULL- COLOUR IMAGES

Method and the device for generating moving and still full-colour images utilising red, green and blue laser beams combined into a single light beam distributed into an angular light shape split and directed to a flat display trough special optical system The invention is classified into class G02B 27/09 of international patent classification

Technical problem, the proposed method successfully solves, is the definition of such a method, that can be successfully realised in a constructed device, which will allow the presentation of still and moving images on flat, thin displays of different sizes in adequate resolution and low energy consumption

The solution of the set tehnical problem can be accomplished in many different ways One possibility of resolving the said technical problem is the use of cathode ray tube (CRT) Drawbacks of that possibility are mainly size of CRT in respect of dimension and weight of the tube itself, energy consumption and distorted picture on the edges Apart of that, the size of displayed image is limited by the TV display construction (beam deflection systems) and therefore not suitable for display of static or dynamic images of greater dimensions, like advertisment displays, big sport-stadium displays etc Soluition to that can be a combhnation of several TV monitors into a matrix (for example 10x10) TV monitors are controled trough special circuit allowing the display of the whole image on the matrix However, distinctive, visible, wide black lines between each display are an addition to previously mentioned drawbacks of CRT The construction of LCD and plasma displays, where greater dimensions are also not possible, brings problems of refreshing the picture and limited viewing angle with LCD displays and high energy consumption with plasma displays The problem of displaying still and moving images on big displays can be solved using three light sources (red, blue and green) in the form of wall projector This kind of display also makes distorted image and requires environmental adjustments (darkened room) in order to meet contrast requirements For displaying still and moving images on sport stadium big displays LED diodes and smaller light bulbs are used Such displays are suitable only for display of alphanumeric data like scores and elapsed time and are less suitable for displaying more complex moving and still images since they do not provide required smooth transition of shapes and colours so image remains rough and grainy

The method and device for generating moving and still full-colour images is as innovation based on the use of modulated laser beams of different colours Laser beams of different colours are combined into an angular light shape and then, using reflecting prisms in the optical system dispersed into multiple (n) angular light shapes These are adequately shifted and directed toward display surface using reflecting surfaces in the optical system

Use of laser light sources and special optical system in a device for generating moving and still images leads to low power consumption, reduced thickness of the device and alows construction of such a device in variety of diferent sizes

The method and device will be explained into a great detail using a construction example and corresponding drawing, which indicate

Figure 1 Schematic presentation of the device for generating moving and still images

The method is based on deviding the input video signal into three modulated signals and signal used to control the rotating mirror Three separate laser beams (red, blue and green) are modulated by three modulated signals respectively Modulated laser beams are then combined, by optical device, into a single light beam directed oposite than the direction of z-axis The beam is propagated in x-y plane by rotating mirror system creating angular light shape dispersed by optical system into n smaller angular light shapes (n being the number of horizontal lines defining the resolution of displayed image) Additionaly, the optical system turns each of n angular shapes into planes perpendicular to x-y plane, gives them slope in respect to the x-y plane, makes them parallel to each other and equilizes the lenght of their optical path. Angular light shapes are then reflected to displaying surface by reflecting surface. On the displaying surface they create lines seen by human eyes as moving or still images.

The described method of generating moving and still full-colour images can be successfully realised using the device for generating such images. The device includes: Signal processing circuitry (2) used for processing of input video signal (1 ) feeding three lasers (9,10,11 ) and controling of rotating system (7). Optical device (15) for combining three modulated laser beams (12,13,14) from three laser sources of different colour (9, 10,11 ) into one beam (16). Rotating system (7) with the reflecting surface (17) for dispersing of modulated beam (16) into an angular light shape (18) laying in x-y plane Optical system (19) for dispersing the angular light shape (18) into n angular light shapes (21 ), placing them into planes perpendicular to x-y plane, giving them slope (20) in respect to plane x-y, and equalizing the lenght of their optical paths. Reflecting surface (22) for reflecting light shapes (21 ) on displaying surface (23) , where they make n lines (24) which are seen from position (25) as an image.

Video signal (1 ) is in the circutry (2) split into three modulated signals and vertical resolution signal which are trough feeds (3,4,5,6) connected to three laser light sources (9,10,11 ) and rotating system (7) respectively. The rotating system (7) with the mirror (17) is connected to the circuitry (2) through feed (6) and feed back line(8). The individual (red, blue and green) laser sources (9,10,1 1 ) emit three light beams (12,13,14) which are modulated by each of three modulated signals using connections (3,4,5) respectively. Three modulated light beams (12,13,14) are combined into one beam (16) pointed in the direction oposite than that of z-axis by optical device (15). The rotating system (7) with the reflecting surface (17) converts the beam (16) into angular light shape (18) laying in x-y plane. Optical system (19) disperses light shape (18) into n angular light shapes (21 ) which are after having passed the optical system (19) reflected from reflecting surface (22) to displaying surface (23) where they create n lines (24) seen from position (25) as an image. Optical system (19) consists of n reflecting prisms (19a1 19an), n reflecting surfaces (19b1 19bn) and n reflecting surfaces (19c1 19cn) Reflecting prisms (19a1 19an), reflecting surfaces (19b1 19bn) and reflecting surfaces (19c1 19cn) are mounted in such a way that n angular light shapes (20) fall parallel, under same angle (20) in respect to x-y plane, having traveled the same optical path, onto the reflecting surface (22) The n reflecting prisms (19a1 19an) disperse the angular light shape (18) into n angular light shapes (21 ), rotate each of these by 90 degrees in respect to x-y plane and also rise each of these angular light shapes (21 ) under angle (20) in respect to x-y plane "n" angular light shapes (21 ) are then put into planes parallel to the x-z plane by reflecting surfaces (19b1 19bn) while reflecting surfaces (19c1 19cn) equalise the lenght of the optical path each of these angular light shapes (21 ) had traveled before reaching reflecting surface (22) From reflecting surface (22) n angular light shapes (21 ) are reflected to the displaying surface (23) (flat screen) where they make n lines (24) seen by human eye from position (25) as an image

Claims

Method and device for generating moving and still full-colour images is characterised by the use of modulated multicolour laser beams (12,13,14), combined into single angular light shape (18) devided in an optical system (19) into n angular light shapes (21 ) using reflecting prisms (19a1 19an), appropriately moved and directed onto displaying surface (23) by reflecting surfaces (19b1 19bn, 19c1 19cn, 22) Method for generating moving and still full-colour images by claim 1 is characterised by division of input video signal into three modulated signals and one control signal enabling together with feedback signal, the control of rotating system with the reflecting surface, and further modulating of three individual laser beams by each of three modulted signals The laser beams (red, blue and green) are consequently combined into single light beam which is directed oposite of the z-axis by appropriate optical device, and dispersed in x-y plane by rotating system with reflecting surface, creating angular light shape, which is devided into n angular light shapes by optical system and put into parallel position to each other, under the same angle in respect to x-y plane and having the same lenght of optical path, allowing the reflecting surface to (re-)dιrect them to the displaying surface The device for generating moving and still full-colour images by claims 1 and 2 is characterised by connection of circutry (2) for procesing of input video signal (1 ) through lines (3,4,5) to laser sources (9,10, 1 1 ) and optical connectinon (12,13, 14) of the later to the optical device (15) The device is additionaly characterised by the connection of the rotating system (7) via connections (6,8) to the circutry (2), the rotation of the reflecting surface (17) mechanicaly connected to the rotating system (7) transforming incoming light beam (16) into angular light shape (18) and directing it towards the optical system (19), the n angular light shapes (21 ) created out of angular shape (18) by optical system (19) are then reflected from reflecting surface (22) to displaying surface (23) The device for generating moving and still full-colour images by claim 3 is characterised by the optical system (19), consisting of n reflecting prisms (19a1...19an), n reflecting surfaces (19b1...19bn) and n reflecting surfaces (19c1...19cn) so mounted that n angular light shapes (21 ) fall parallel, contained in planes perpendicular to x-y plane, under the same angle (20) in respect to x-y plane and having traveled the same lenght of optical path, onto the reflecting surface (22).