CN1366196A - Method for improving optical quality of photo-mechanical system - Google Patents
Method for improving optical quality of photo-mechanical system Download PDFInfo
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- CN1366196A CN1366196A CN 01101631 CN01101631A CN1366196A CN 1366196 A CN1366196 A CN 1366196A CN 01101631 CN01101631 CN 01101631 CN 01101631 A CN01101631 A CN 01101631A CN 1366196 A CN1366196 A CN 1366196A
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Abstract
The invention discloses a method for improving optical quality in optical-mechanical system. A bi-directional spectroscope is put in a proper position in the optical-mechanical system, for example, the bi-directional spectroscope is put in the paths red, green and blue light in the optical-mechanical system or other places where filtering out of stray light is needed. The stray light in red, green, or blue light is refracted out of the system, making the red, green, blue light be purified, improved color contrast and saturation as well as optical projection quality.
Description
The present invention relates to a kind of design of optical-mechanical system, and the particularly a kind of method that can improve the optical quality of optical-mechanical system, system is with two-way light splitting surface mirror (Dichroic Mirror, DM) be arranged on the appropriate location in the optical-mechanical system, with the veiling glare in the minimizing system, reduce because of the heat problem that light beam was produced, and then improve optical-mechanical system to color coordinate saturation degree when.
Liquid crystal display cells in recent years has been widely used in the daily life, as LCD TV, laptop computer and liquid crystal projector etc. gradually.Optical-mechanical system in the general liquid crystal projector optical projection system can be divided into from two kinds of designs of shaft type (Off axial) and axle following formula (On line), so-calledly be meant its incident light source and outgoing light source not at grade from shaft type design, the axle following formula designs and then refers to its incident light source and outgoing light source at grade.And at present the projection pattern of liquid crystal projector can be divided into pre-projecting type and two kinds of back projection types, and the design of liquid crystal projector now adopts rear-projection, axle following formula to design more.And in the field of liquid crystal projector, the topic that the weight of projection quality and optical-mechanical system, volume are shown great attention to always.
At first please refer to Fig. 1, it is the synoptic diagram of optical-mechanical system design in the conventional reflective liquid crystal projector.Light source 102 outgoing one white light W in the optical-mechanical system 100 filters ultraviolet light in the light source 102 and infrared light through an optical filtering, forms the white light WS of a S polarization again behind a polarization converter (S-P Converter).White light WS reflexes to a two-way light splitting surface mirror 106 through a reflecting surface mirror 104, and two-way light splitting surface mirror 106 is divided into the indigo plant, green mixed light of a reflection with white light WS, and (BS is GS) with a ruddiness RS who penetrates.Wherein, penetrate ruddiness RS and reflex to a polarisation spectroscope 110, reflex on the red liquid crystal panel 112 by the ruddiness RS of polarisation spectroscope 110 again the S polarization by a reflecting surface mirror 108.And the indigo plant, green mixed light of reflection are divided into the blue light BS that the green glow GS and of a reflection penetrates via a two-way light splitting surface mirror 114 with blue, green mixed light again.The green glow GS of reflection reflexes on the green liquid crystal panel 118 by the green glow GS of a polarisation spectroscope 116 with the S polarization, and the blue light BS that penetrates reflexes on the blue liquid crystal panel 122 by the blue light BS of a polarisation spectroscope 120 with the S polarization.Last ruddiness RP, green glow GP and the blue light BP that reflects the P polarization more respectively by red liquid crystal panel 112, green liquid crystal panel 118, blue liquid crystal panel 122, close light after be projected on the firefly screen (not shown) via a two-way prism 124 (X-cube, Dichroic Prism) by a projection objective 126 (ProjectorLens).
Then please refer to Fig. 2, it is the synoptic diagram of optical-mechanical system design in traditional penetration liquid crystal projector.Light source 200 emissions one white light W in the optical-mechanical system 200, the white light WS of formation one S polarization behind a polarization converter 203.White light WS reflexes to a two-way light splitting surface mirror 206 through a reflecting surface mirror 204, and two-way light splitting surface mirror 206 is divided into the indigo plant, green mixed light of a reflection with white light WS, and (BS is GS) with a ruddiness RS who penetrates.Wherein, penetrate ruddiness RS and penetrate a red liquid crystal panel 210 last arrival in the two-way prism 212 by a reflecting surface mirror 208 reflections.And the indigo plant, green mixed light of reflection are divided into the blue light BS that the green glow GS and of a reflection penetrates via a two-way light splitting surface mirror 214 with blue, green mixed light again.The green glow GS of reflection will arrive in the two-way prism 212 by penetration green liquid crystal panel 216 at last, and the blue light BS that penetrates reflexes to a reflecting surface mirror 220 by a two-way light splitting surface mirror 218 with the blue light BS of S polarization, by reflecting surface mirror 220 the blue light BS reflection of S polarization is penetrated blue liquid crystal panel 222 last arrival in the two-way prism 212 again.After ruddiness RS, green glow GS and blue light BS close light by two-way prism 212, be projected on the firefly screen (not shown) via a projection objective 224.
Then please refer to Fig. 3, it is the synoptic diagram of optical-mechanical system design in the another kind of conventional reflective liquid crystal projector.Light source 302 emissions one white light W in the optical-mechanical system 300, the white light WS of formation one S polarization behind a polarization converter.White light WS is projected to ruddiness R, green glow G, blue light B respectively on red liquid crystal panel 308, green liquid crystal panel 310 and the blue liquid crystal panel 312 via a polarisation spectroscope 304 and a two-way Amici prism 306.Reflect ruddiness R, green glow G and blue light B by red liquid crystal panel 308, green liquid crystal panel 310, blue liquid crystal panel 312 respectively more at last, close light after be projected on the firefly screen by a projection objective according to original light path.
No matter above-mentioned traditional liquid crystal projector is reflecting liquid crystal projector or penetration liquid crystal projector, the light that still contains some other colors via the light path of all kinds (R, G, B) after two-way color separation face mirror (DM) or polarisation spectroscope (PBS) beam split is not hundred-percent pure color, and can have some veiling glares, these veiling glares are not controlled by liquid crystal panel and have increased the weight of the heat problem of light path of all kinds, impel liquid crystal panel when dark attitude (DarkState), stronger veiling glare image contrast can occur, and the colourity impure phenomenon when bright attitude (Bright State), occurs.In addition, veiling glare even can have influence on the penetrance of optical element because of the heat problem that it brought, and then have influence on the projection quality of optical-mechanical system integral body.
Therefore, the object of the present invention is to provide a kind of method of improving optical quality of photo-mechanical system, is that two-way light splitting surface mirror is arranged at appropriate location in the optical-mechanical system, so that the parasitic reflection in the optical-mechanical system is gone out outside the optical-mechanical system.
For reaching above-mentioned purpose of the present invention, a kind of method of improving optical quality of photo-mechanical system is provided, system is arranged at appropriate location in the optical-mechanical system with two-way light splitting surface mirror, as being arranged in the optical-mechanical system two-way light splitting surface mirror red, green, on the blue light path or other positions that veiling glare need be filtered, by two-way light splitting surface mirror with optical-mechanical system tell red, green, parasitic reflection in the blue light goes out outside the optical-mechanical system, make and pass through the red of two-way light splitting surface mirror, green, blue light is a pure color light, and then the contrast and the color coordinate saturation degree of promoting optical-mechanical system, the optical projection quality of raising optical-mechanical system.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly also elaborates in conjunction with the accompanying drawings, wherein
Fig. 1 is the synoptic diagram of optical-mechanical system design in the conventional reflective liquid crystal projector;
Fig. 2 is the synoptic diagram of optical-mechanical system design in traditional penetration liquid crystal projector;
Fig. 3 is the synoptic diagram of optical-mechanical system design in the another kind of conventional reflective liquid crystal projector;
Fig. 4 is the synoptic diagram according to optical-mechanical system design in the reflecting liquid crystal projector of one embodiment of the present invention;
Fig. 5 is the synoptic diagram according to optical-mechanical system design in the penetration liquid crystal projector of one embodiment of the present invention; And
Fig. 6 is the synoptic diagram according to optical-mechanical system design in the another kind of reflecting liquid crystal projector of one embodiment of the present invention.
The explanation of Reference numeral
100,200,300,400,500,600: optical-mechanical system
102,202,302,402,502,602: light source
104,108,204,208: the reflecting surface mirror
106,114,206,214,218: two-way light splitting surface mirror
110,116,120,304: the polarisation spectroscope
112,210,308,412,510,608: the red liquid crystal panel
118,216,310,418,516,610: the green liquid crystal panel
122,222,312,422,522,612: the blue liquid crystal panel
124,212,424,512: two-way prism
126,224,426,524: projection objective
203,503: polarization converter
220,520: the reflecting surface mirror
306,606: two-way Amici prism
404,408,504,508: the reflecting surface mirror
406,414,506,514,518: two-way light splitting surface mirror
410,416,420,604: the polarisation spectroscope
428,430,432: two-way beam split minute surface
526,528,530: two-way beam split minute surface
614,616,618: two-way beam split minute surface
Among the present invention two-way light splitting surface mirror is arranged on the appropriate location in the optical-mechanical system, for example being arranged at each coloured light (R, G, B) enters on liquid crystal panel (Panel) light path before, with the veiling glare in the minimizing system, reduce because of the heat problem that light beam was produced, and then the projection that improves optical-mechanical system is to color coordinate saturation degree when.
At first please refer to Fig. 4, it is the synoptic diagram according to optical-mechanical system design in the reflecting liquid crystal projector of one embodiment of the present invention.Light source 402 emissions one white light W in the optical-mechanical system 400, the white light WS of formation one S polarization behind a polarization converter (S-P Converter).White light WS reflexes to a two-way light splitting surface mirror 406 through a reflecting surface mirror 404, and two-way light splitting surface mirror 406 is divided into the indigo plant, green mixed light of a reflection with white light WS, and (BS is GS) with a ruddiness RS who penetrates.Wherein, penetrate ruddiness RS and arrive a polarisation spectroscope 410 through a two-way light splitting surface mirror 428, reflex on the red liquid crystal panel 412 by the ruddiness RS of polarisation spectroscope 410 again the S polarization by a reflecting surface mirror 408 reflections.And the indigo plant, green mixed light of reflection are divided into the blue light BS that the green glow GS and of a reflection penetrates via a two-way light splitting surface mirror 414 with blue, green mixed light again.The green glow GS of reflection is through a two-way light splitting surface mirror 430, and reflex on the green liquid crystal panel 418 by the green glow GS of a polarisation spectroscope 416 with the S polarization, and the blue light BS that penetrates is through a two-way light splitting surface mirror 432, and reflexes on the blue liquid crystal panel 422 by the blue light BS of a polarisation spectroscope 420 with the S polarization.Last ruddiness RP, green glow GP and the blue light BP that reflects the P polarization more respectively by red liquid crystal panel 412, green liquid crystal panel 418, blue liquid crystal panel 422, close light after be projected on the firefly screen (not shown) via a two-way prism 424 (X-cube, Dichroic Prism) by a projection objective 426.
Above-mentioned two-way light splitting surface mirror 428,430,432 can go out the parasitic reflection in ruddiness, green glow and the blue light outside the optical-mechanical system 400 respectively, and its ornaments angle is a principle veiling glare can be penetrated optical-mechanical system 400.
Then please refer to Fig. 5, it is the synoptic diagram according to optical-mechanical system design in the penetration liquid crystal projector of one embodiment of the present invention.Light source 502 emissions one white light W in the optical-mechanical system 500, the white light WS of formation one S polarization behind a polarization converter 503.White light WS reflexes to a two-way light splitting surface mirror 506 through a reflecting surface mirror 504, and two-way light splitting surface mirror 506 is divided into the indigo plant, green mixed light of a reflection with white light WS, and (BS is GS) with a ruddiness RS who penetrates.Wherein, penetrate ruddiness RS, and penetrate a red liquid crystal panel 510 last arrival in the two-way prism 512 by a reflecting surface mirror 508 reflections through a two-way light splitting surface mirror 526.And the indigo plant, green mixed light of reflection are divided into the blue light BS that the green glow GS and of a reflection penetrates via a two-way light splitting surface mirror 514 with blue, green mixed light again.The green glow GS of reflection is through a two-way light splitting surface mirror 528 and penetration green liquid crystal panel 516 last arrival in the two-way prism 212, and the blue light BS that penetrates reflects through the two-way light splitting surface mirror 530 last reflecting surface mirrors 520 that arrive by the blue light BS of a two-way light splitting surface mirror 518 with the S polarization, penetrates in the two-way prism 212 of blue liquid crystal panel 522 last arrival by the blue light BS reflection of reflecting surface mirror 520 with the S polarization again.After ruddiness RS, green glow GS and blue light BS close light by two-way prism 512, be projected on the firefly screen (not shown) via a projection objective 524.
Above-mentioned two-way light splitting surface mirror 526,528,530 can go out the parasitic reflection in ruddiness, green glow and the blue light outside the optical-mechanical system 500 respectively, and its ornaments angle is a principle veiling glare can be penetrated optical-mechanical system 500.
Please refer to Fig. 6 at last, it is the synoptic diagram according to optical-mechanical system design in the another kind of reflecting liquid crystal projector of one embodiment of the present invention.Light source 602 emissions one white light W in the optical-mechanical system 600, the white light WS of formation one S polarization behind a polarization converter.White light WS is projected to ruddiness R, green glow G, blue light B respectively on red liquid crystal panel 608, green liquid crystal panel 610 and the blue liquid crystal panel 612 via a polarisation spectroscope 604 and a two-way Amici prism 606.Reflect ruddiness R, green glow G and blue light B by red liquid crystal panel 608, green liquid crystal panel 610, blue liquid crystal panel 612 respectively more at last, close light after be projected on the firefly screen by a projection objective according to original light path.
Above-mentioned two-way light splitting surface mirror 614,616,618 can go out the parasitic reflection in ruddiness, green glow and the blue light outside the optical-mechanical system 600 respectively, and its ornaments angle is a principle veiling glare can be penetrated optical-mechanical system 600.
In sum, the present invention has following advantage at least:
1. before the present invention is arranged at liquid crystal panel in the optical-mechanical system with the two-way light splitting surface mirror of proper number, with parasitic reflection and make it to leave optical-mechanical system,, improve projection quality to eliminate the veiling glare noise, to reduce element because of hyperabsorption light causes heat problem.
2. the present invention is arranged at the two-way light splitting surface mirror of proper number on the light path before the liquid crystal panel in the optical-mechanical system, with parasitic reflection and make it to leave optical-mechanical system improving contrast and the color coordinate saturation degree of system, and then the projection quality of raising optical-mechanical system.
3. the present invention utilizes two-way light splitting surface mirror to reach the effect of filtering unnecessary veiling glare, does not do under the condition of adjusting significantly the projection quality that still can improve optical-mechanical system, required expend with low cost in whole optical-mechanical system design.
Though the present invention is described in conjunction with the preferred embodiments; right its is not in order to limit the present invention; the insider can do various changes and retouching under the condition that does not break away from spirit and scope of the invention, so protection domain of the present invention is when being defined by the appended claim book.
Claims (6)
1. method of improving optical quality of photo-mechanical system, the projection quality that is suitable for improving liquid crystal projector, this method of improving optical quality of photo-mechanical system comprises at least:
One optical-mechanical system is provided, and this optical-mechanical system has a light source at least, a beam splitting system, is closed photosystem, a plurality of liquid crystal panels and a projection objective, and wherein this beam splitting system is divided into one first coloured light, one second coloured light and one the 3rd coloured light with this light source; And
A plurality of two-way light splitting surface mirrors are arranged on the light path of this first coloured light, second coloured light and the 3rd coloured light, so that the parasitic reflection in this first coloured light, second coloured light and the 3rd coloured light is gone out outside the optical-mechanical system.
2. the method for improving optical quality of photo-mechanical system as claimed in claim 1, wherein the light path design of this optical-mechanical system comprises reflecting liquid crystal projector.
3. the method for improving optical quality of photo-mechanical system as claimed in claim 1, wherein the light path design of this optical-mechanical system comprises the penetration liquid crystal projector.
4. method of improving optical quality of photo-mechanical system comprises at least:
One optical-mechanical system is provided; And
A plurality of two-way light splitting surface mirrors are arranged on the light path of first coloured light in this optical-mechanical system, second coloured light and the 3rd coloured light, so that the parasitic reflection in this first coloured light, second coloured light and the 3rd coloured light is gone out outside this optical-mechanical system.
5. the method for improving optical quality of photo-mechanical system as claimed in claim 4, wherein the light path design of this optical-mechanical system comprises reflecting liquid crystal projector.
6. the method for improving optical quality of photo-mechanical system as claimed in claim 4, wherein the light path design of this optical-mechanical system comprises the penetration liquid crystal projector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01101631 CN1366196A (en) | 2001-01-19 | 2001-01-19 | Method for improving optical quality of photo-mechanical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01101631 CN1366196A (en) | 2001-01-19 | 2001-01-19 | Method for improving optical quality of photo-mechanical system |
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| CN1366196A true CN1366196A (en) | 2002-08-28 |
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| CN 01101631 Pending CN1366196A (en) | 2001-01-19 | 2001-01-19 | Method for improving optical quality of photo-mechanical system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7365906B2 (en) | 2003-06-10 | 2008-04-29 | Dai Nippon Printing Co., Ltd. | Projection screen and projection system containing same |
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2001
- 2001-01-19 CN CN 01101631 patent/CN1366196A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7365906B2 (en) | 2003-06-10 | 2008-04-29 | Dai Nippon Printing Co., Ltd. | Projection screen and projection system containing same |
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