MXPA96003948A

MXPA96003948A - Opt projection system

Info

Publication number: MXPA96003948A
Application number: MXPA/A/1996/003948A
Authority: MX
Inventors: Lim Daeyoung; Yang Jinse
Original assignee: Daewoo Electronics Co Ltd
Priority date: 1994-03-09
Filing date: 1996-09-09
Publication date: 1997-06-01

Abstract

The present invention relates to an optical projection system capable of displaying an M x N number of pixels, wherein M and N are integers, comprising: a non-strut white light source for emitting a white light along a first optical path in a first optical plane, where the white light consists of a first or a second and a third primary light beams, each of the primary light beams being one of the primary colors, a triple of activated mirror formations M x N including a first, a second and third mirror formations operated in M x N, each of the driven mirrors has an actuator and a mirror fixed thereto, each of the mirrors driven in the formations capable of changing the optical path of the mirrors. light beams reflected therefrom, a source suppressor that is provided with a light transmitting portion having a specific configuration and a light suppressing portion and is placed on the first optical path in the first optical plane to set the white light from the non-strut white light source to a predetermined configuration, a source lens, placed between the source suppressor and the non-strut white light source for focus white light emitted by the non-strut white light source to the source suppressor, an optical medium, to reflect white light from the source suppressor at a predetermined angle, a beam splitting medium that includes a first and a second mirror dichroic, where the first dichroic mirror, placed between the half-optical and the second dichroic mirror facing the first M x N powered mirror formation, is used to isolate and reflect the first primary light beam from the white light from the mid-optic towards the first formation of M x N powered mirrors, and to transmit the second and third primary light beams to the second dichroic mirror, and the second mirror dichroic, placed between the first dichroic mirror and the third formation of driven mirrors M x N being oriented towards the second formation of powered mirrors M x N upon receiving the second and third primary light beams from the first dichroic mirror, to isolate and reflect the second primary light beam to the second array of powered mirrors M x N, and to transmit the third primary light beam to the third array of powered mirrors M x N; a set of field lenses including a first, a second and a third lens field, each of the first, second and third field lenses are placed between the first dichroic mirror and the first array of powered mirrors M x N, and between the second dichroic mirror and the second array of powered mirrors M x N, and between the second dichroic mirror and the third formation of powered mirrors M x N, respectively, where each of the field lenses is used to collimate each one of the s primary light beams towards the corresponding formation of M x N powered mirrors and to refocus each of the primary light beams reflected from each of the mirrors operated in each of the formations, a projection screen to present an image produced of the number M x N of pixels therein: a projection suppressor which is provided with a light transmitting portion and a light suppressing portion which passes a predetermined amount of the primary light beams reflected from the set of mirrored formations of mirrors M x N, and a projection lens to project the primary light beams from the projection suppressor to the projection screen, thereby presenting each of the pixels corresponding to the

Description

"OPTICAL PROJECTION SYSTEM" TECHNICAL FIELD OF THE INVENTION The present invention relates to an optical projection system; and, more particularly with an optical projection system having a novel optical baffle means.

ANTECEDENTS OF THE TECHNIQUE Among the various video presentation systems obtainable in the art, an optical projection system is known which is capable of providing superior quality images on a large scale. In Figure 1, an optical projection system 100 of the prior art is illustrated which comprises a source 1 of non-point white light, a bar 2 of Schlieren (strioscopy) which is provided with a plurality of reflecting surfaces and a corresponding number of slits, a source lens 3, a projection lens 4, a field lens system 5, a projection screen 6, a division means 7 of the beam including a first and a second mirror 8, 9 dichroic, and a first, a second and a third formations 10, 11, 12 of mirrors 13 driven M x N. In this system, a white light emanating from the source 1 of non-point white light is focused along a first path of optical light towards the reflecting surfaces of the Schlieren 2 bar by the source lens 3, wherein the white light consists of a first, a second and a third light beam primary, each of the primary light beams, one of the primary colors. The reflective surfaces of the Schlieren bar 2 lie in relation to the source lens 3 and the field lens system 5. The reflected white light from each of the reflecting surfaces diverges along a second optical path and is collimated by a field lens system 5, thus being illuminated uniformly towards the beam splitting means 7 including the first and second mirrors 8,9, dichroic, where the first dichroic mirror 8 is placed between the field lens system 5 and the second dichroic mirror 9 is oriented towards the first formation 10 of mirrors 13 driven M x N, and the second mirror 9 dichroic between the first mirror dichroic and the third formation 12 of mirrors 13 driven M x N being oriented towards the second formation 11 of mirrors 13 driven M x N. The first mirror 8 dichroic receives the white light of the lens system 5 field, reflects the first primary light beam of the white light towards the first array 10 of mirrors 13 driven M x N, and transmits the second and third primary light beams towards the second mirror or dichroic, which, in turn, receives the second and third primary light beams from the first dichroic mirror, reflects the second primary light beam towards the second formation 11 of mirrors 13, driven M x N, and transmits the third light beam primary to the third formation 12 of mirrors 13 driven M x N. Each of the mirrors 13 driven from the formations 10, 11, 12 corresponds to each of the pixels to be presented. The optical path of the primary light beams reflected from each of the mirrors 13 operated in each of the formations 10, 11, 12, is determined by the amount of deviation thereof. The primary light beams reflected from each of the non-diverted driven mirrors in each of the formations 10, 11, 12, are again focused towards the Schlieren bar 2 by the field lens system 5 through the first and second mirrors. 8, 9 dichroic along the second optical path and stop by reflecting surfaces thereof, while the primary light beams reflected from each of the mirrors driven deviated in each of the formations 10, 11, 12 focus again towards the bar 2 Schlieren by the field lens system 5 through the first and second dichroic mirrors 8, 9 along a third optical path so that a portion of the focused light beams pass through the slots of the same. The primary light beams from each of the mirrors 13 operated in each of the formations 10, 11, 12 passing through the slots are transmitted to the projection lens 4 projecting the primary light beams transmitted from each of the mirrors 3 operated in each of the formations 10, 11, 12 on the screen 6 of projection, thus presenting each of the pixels corresponding to them. One of the main disadvantages of the above-described optical projection system 100 arises from the use of the 2 Schlieren bar. Since the white light emanating from the non-point light source 1 is focused towards the reflecting surfaces of the 2-beam at a fixed angle, the white light reflected therefrom is extremely divergent and has a large beam diameter, and in order to of uniformly illuminating this white light towards the beam splitting means 7 and towards the formations 10, 11, 12 of the driven mirrors M x N and then refocusing the reflected light from the mirrors formations 10, 11, 12 13 driven M x N towards the bar 2 Schileren, the field lens system 5 employed therein must become extremely complicated.

EXHIBITION OF THE INVENTION Therefore, a main object of the present invention is to provide an optical projection system without using a Schlieren bar, thus eliminating a need to provide for it a complicated field lens system. In accordance with the present invention, there is provided an optical projection system capable of displaying an M x N number of pixels, where M and N are integers, comprising: a non-point white light source towards a first optical plane where white light consists of a first, second and third primary light beams, each of the primary light beams being one of the primary colors; a triple of activated mirror formations M x N, including a first, a second and a third driven mirror array M x N, each of the driven mirrors has an actuator and a mirror fixed thereto, each of the driven mirrors in the formations it is able to change the optical path of the primary light beams reflected from them; a source suppressor, which is provided with a light suppressing portion having a specific configuration and a light stopping portion and which is placed on the first optical path in the first optical plane, to configure the white light from the source of light. non-punctual white light to a default setting; a source lens, placed between the source suppressor and the non-point white light source to focus the white light emitted by the non-point white light source towards the source suppressor; an optical means, to reflect the white light from the source suppressor at a predetermined angle; a beam splitting means including first and second dichroic mirrors, wherein the first dichroic mirror, placed between the optical means and the second dichroic mirror oriented towards the first array of powered mirrors, is used to isolate and reflect the first primary light beam of white light from the optical medium to the first formation of M x N powered mirrors and to transmit the second and third primary light beams to the second dichroic mirror, and the second dichroic mirror placed between the first dichroic mirror and the third formation of driven mirrors M x N oriented towards the second formation of driven mirrors M x N, upon receiving the second and third primary light beams from the first dichroic mirror, to isolate and reflect the second primary light beam towards the second formation of M x N powered mirrors, and for transmitting the third primary light beam to the third driven mirror array M x N; a set of field lenses including a first, a second and a third field lens, each of the first, second and third field lenses is placed between the first dichroic mirror and the first array of powered mirrors M x N, between the second dichroic mirror and the second array of powered mirrors M x N, and between the second dichroic mirror and the third array of powered mirrors of M x N, respectively, wherein each of the field lenses is used to collimate each of the primary light beams towards the corresponding formation of M x N powered mirrors and to refocus each of the primary light beams reflected from each of the mirrors driven in each of the formations; a projection screen for presenting therein a produced image of the number M x N of pixels; a projection suppressor that is provided with a light transmitting portion and a light suppressing portion, for passing a predetermined amount of the primary light beams reflected from the trio of the formations of the driven mirrors M x N; and a projection lens for projecting the primary light beams from the projection suppressor to the projection screen, thereby presenting each of the pixels corresponding thereto.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention together with the foregoing objects and advantages and others will become apparent from the following description of the preferred embodiments that are provided in conjunction with the accompanying drawings, wherein: Figure 1 depicts a schematic view of an optical projection system of the prior art; Figure 2 illustrates a schematic view of an optical projection system in accordance with a preferred embodiment of the present invention; Figure 3 shows a schematic view of the optical projection system incorporating therein a detailed view of the optical means shown in Figure 2; and Figure 4 illustrates a schematic view of the optical projection system incorporating therein a detailed view of another optical means shown in Figure 2.

MODES FOR CARRYING OUT THE INVENTION Referring now to Figures 2 to 4, schematic views of the optical projection system of the invention are provided in accordance with the preferred embodiments of the present invention. It should be noted that the same parts that appear in Figures 2 to 4 are represented by like reference numbers. In Figure 2, there is illustrated a schematic view of the optical projection system 200 of the invention comprising a source 101 of non-point white light, a source lens 102, a source suppressor 103 that is provided with a transmitting portion 50 of light having a specific configuration, and a light suppressing portion 61, an optical means 104 including a reflecting surface 120, a beam dividing means 105 including a first and a second mirror 106, 107, dichroic, a triple of mirrored formations 111 driven M x N including a first, a second and a third array 108, 109, 110 of mirrors 111 driven M x N, a set of field lenses including a first, a second and a third lens 112, 113 , 114 field, a projection suppressor 115 that is provided with a light transmitting portion 52 having a specific configuration and a light suppressing portion 62, a projection lens 116 and a screen 117 of projection.

In this system, a white light emanating from the source 101 of non-point white light is focused along a first optical path in a first optical plane towards the light transmitting portion 51 in the source suppressor 103 via the lens 102. of source placed between the source 101 of non-punctual white light and the suppressor 103 of source, wherein the white light consists of a first, a second and a third primary light beams, each of the primary light beams being one of the colors primary. The source suppressor 103 is used to set the white light from the source 101 of non-point white light through the source lens 102 to a predetermined configuration by allowing a certain portion of the white light to pass through the transmitting portion 51 of the source. light of it. The white light from the source suppressor 103 having the predetermined configuration proceeds towards the reflective surface 120 of the optical medium 104. The reflecting surface 120 of the optical medium 104 inclined at an angle, eg, 48 ° to 50 ° with respect to the first optical plane, rotates in a relationship with the source suppressor 103 and the beam splitting means 105. . The white light reflected from the reflective surface 120 of the optical medium 104 proceeds along a second optical medium and is illuminated uniformly towards the beam dividing means 105 including the first and second dichroic mirrors 106, 107. The second optical path is inclined from 80 ° to 100 ° C with respect to the first optical path 118. The first dichroic mirror 106 inclined at an angle, e.g., of 45 °, and placed between the optical means 104 and the second dichroic mirror 107 facing the first formation 10 of the mirrors 111 operated in M x N, receives the white light of the surface 120 reflective of the optical medium 104, isolates and reflects the first primary light beam of the white light towards the first array 108 of mirror 111 driven M x N, and transmits the second and third primary light beams towards the second dichroic mirror 107. The second dichroic mirror inclined at an angle, e.g., of 45 ° and placed between the third mirror formation 110 driven M x N, and the first dichroic mirror 106 facing the second array 109 of the mirrors 111 driven M x N, upon receiving the second and third primary light beams from the first dichroic mirror 106, isolates and reflects the second primary light beam towards the second array 109 of mirror 111 driven M x N, and transmits the third primary beam to the third formation 110 of the mirrors 111 driven M x N. Each of the mirrors 111 driven in the formations 108, 109, 110 includes a mirror 53 and an actuator 54 that is made of a piezoelectric material or an electrorestrictive material that deforms in response to an electric field applied to it. Each of the mirrors 111 in the formations 108, 109, 110 corresponds to each of the pixels to be presented. Each of the first, second and third lenses 112, 113, 114, placed between the first dichroic mirror 106 and the first formation 108 of driven mirrors 111 M x N, the second dichroic mirror 107 and the second formation 109 of the driven mirrors 111 M x N, and the second dichroic mirror 107 and third mirror formation 110 driven M x N respectively, is used to collimate each of the primary light beams from each of the mirrors 106, 107 in the beam dividing means 105 to thereby illuminate uniformly each of the primary light beams towards the corresponding formation of M x N powered mirrors. The optical path of the primary light beams reflected from each of the mirrors 111 operated in each of the formations 108, 109, 110, is determined by the amount of deviation thereof. The primary light beams reflected from each of the non-deviated driven mirrors in each of the formations 108, 109, 110, are again focused towards the projection suppressor 115 by the corresponding field lens through the division means 105 of the beam and stops by the light suppressor portion 62 of the projection suppressor 115 placed between the projection lens 116 and the optical medium 104, while the primary light beams reflected from each of the driven mirrors diverted in each of the formations 108, 109, 110 are again focused towards the projection suppressor 115 by the corresponding field lens through the beam splitting means 105, along a third optical path so that a portion of the focused primary light beams pass through the light transmitting portion 52 of the projection suppressor 115 to thereby modulate the intensity of the light beams pri marios In order that the primary light beams constituting the white light emitted from the source 101 of non-point white light form an image corresponding to an electrical signal in the projection screen 117, the optical path for each of the primary light beams between the optical means 104 and each of the formations 108, 109, 110 of the driven mirrors 111, must be of the same length. In addition, the optical path of each of the primary light beams proceeds from the source suppressor 103 each of the formations 108, 109, 110 of the powered mirrors 111 M x N and from 111 driven M x N to the suppressor 115 of projection must be of the same length. This is achieved by placing the source and projection suppressors 103, 115 at the focus point of the field lenses 112, 113, 114, employed therein. In addition, the light density of the optical projection system 200 is at its highest point when all the white light that has passed through the light transmitting portion 51 of the source suppressor 103 passes through the transmitting portion 61 of light from the projection suppressor 115, and this can be achieved by making the light transmitting portions 51, 61 of the source and projection suppressors 103, 115 of identical configuration and size. The primary light beams from each of the mirrors 111 driven in the formations 108, 109, 110 passing through the light transmitting portion 61 of the projection suppressor 115 placed at the focusing point of the lenses 112, 113, 114 field, are transmitted to the projection lens 116, which, in turn, projects the primary light beams transmitted to the projection screen 117, thus presenting each of the pixels to be presented. Instead of employing a complicated field lens system 5 between the beam splitting means 7 and the Schlieren rod 2 as observed in the prior art optical projection system 100, the optical projection system 200 of the invention employs the triple of the field lenses 112, 113, 114, and each of the field lenses being positioned between the first dichroic mirror 106 and the first array 108 of the driven mirrors 111, the second dichroic mirror 107 and the second array 109 of mirrors 111 actuated, and the second dichroic mirror 107 and third mirror array 110 driven, respectively. Under this arrangement, each of the primary light beams becomes less divergent and has a smaller beam diameter and therefore, can be focused more easily, thus eliminating a need to employ a complicated field lens system. A schematic diagram of the optical projection system 200 of the invention is illustrated in Figure 3 and incorporates therein an optimum means 104 having a total mirror 54 capable of a total reflection of the white light from the source suppressor 103 to the 105 beam splitting means. Alternatively, a schematic diagram of the optical projection system 200 of the invention which incorporates a polarization beam splitter (PBS) 55 and a plate 56? - / 4, where the PBS 55 is used for separating the white light into a pair of polarization beams, a first and a second polarization beams and reflecting one of the polarization beams towards the plate 56/4, and the plate 56 7 ^ / 4 upon receiving the reflected polarization beam from the PBS 55, it is used to change the phase of the polarization beam reflected from the PBS 55 and transmit the polarization beam changed in phase to the beam splitting means 105. Although the present invention has been described with respect to certain preferred embodiments only, other modifications and variations may be made without changing the scope of the present invention, as set forth in the following claims.

Claims

CLAIMS:

1. An optical projection system capable of presenting an M x N number of pixels, where M and N are integers, comprising: a non-point white light source for emitting a white light along a first optical path in a first optical plane, where the white light consists of a first or a second and a third primary light beams, each of the primary light beams being one of the primary colors; a triple of mirrored formations M x N including a first, a second and third mirror formations operated in M x N, each of the driven mirrors has an actuator and a mirror fixed thereto, each of the mirrors driven in the formations are capable of changing the optical path of the primary light beams reflected from them; a source suppressor which is provided with a light transmitting portion having a specific configuration and a light suppressing portion and which is placed on the first optical path in the first optical plane to configure the white light from the white light source not punctual to a predetermined configuration; a source lens, placed between the source suppressor and the non-point white light source to focus the white light emitted by the non-point white light source towards the source suppressor; an optical means, to reflect the white light from the source suppressor at a predetermined angle; a beam splitting means including first and second dichroic mirrors, wherein the first dichroic mirror, placed between the optical medium and the second dichroic mirror oriented towards the first formation of driven mirrors M x N, is used to isolate and reflecting the first primary light beam of the white light from the optical medium towards the first array of powered mirrors M x N, and for transmitting the second and third primary light beams to the second dichroic mirror, and the second dichroic mirror, placed between the first dichroic mirror and the third formation of driven mirrors M x N being oriented towards the second formation of driven mirrors M x N upon receiving the second and third primary light beams from the first dichroic mirror, to isolate and reflect the second primary light beam towards the second formation of powered mirrors M x N, and to transmit the third primary light beam to the third activated mirror formation os M x N; a set of field lenses including a first, a second and a third field lens, each of the first, second and third field lenses are placed between the first dichroic mirror and the first array of powered mirrors M x N, and between the second dichroic mirror and the second array of powered mirrors M x N, and between the second dichroic mirror and the third array of powered mirrors M x N, respectively, wherein each of the field lenses is used to collimate each of the primary light beams towards the corresponding formation of M x N powered mirrors and to refocus each of the primary light beams reflected from each of the mirrors driven in each of the formations; a projection screen for presenting a produced image of the number M x N of pixels therein; a projection suppressor that is provided with a light transmitting portion and a light suppressing portion that passes a predetermined amount of the primary light beams reflected from the triple of M x N powered mirror arrays, and a projection lens for projecting the primary light beams from the projection suppressor to the projection screen, thus presenting each of the pixels corresponding thereto.

2. The optical projection system according to claim 1, wherein the optical means comprises a total mirror capable of providing a total reflection of the white light from the source suppressor.

3. The optical projection system according to claim 1, wherein the source suppressor comprises a light transmitting portion and a light suppressing portion.

4. The optical projection system according to claim 1, wherein the projection suppressor comprises a light transmitting portion and a light suppressing portion. The optical projection system according to claim 1, wherein the light transmitting portion of the source suppressor is identical to the light transmitting portion of the projection suppressor in shape and size. 6. The optical projection system according to claim 1, wherein the source and projection suppressors are placed at the focus point of the field lenses employed therein. The optical projection system according to claim 1, wherein the optical medium comprises a polarization beam splitter (PBS) and an A / 4 plate, the polarization beam splitter is used to separate the white light in a pair of polarization beams, a first and a second polarization beams and reflect one of the polarization beams towards the plate? / 4, and plate - / 4, upon receiving the polarization beam reflected from the polarization beam suppressor in order to change the phase of the reflected polarization beam and transmit it to the beam splitting means.