CN1157623C - Optical path design of optical system - Google Patents
Optical path design of optical system Download PDFInfo
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- CN1157623C CN1157623C CNB011015780A CN01101578A CN1157623C CN 1157623 C CN1157623 C CN 1157623C CN B011015780 A CNB011015780 A CN B011015780A CN 01101578 A CN01101578 A CN 01101578A CN 1157623 C CN1157623 C CN 1157623C
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Abstract
The present invention relates to a light path design of light machine systems, which comprises a light source, a polarization converter, a polarized light spectroscope, a plurality of dichroic mirrors aiming at different color light and liquid crystal panels of the color light, the light source enters a light splitting system composed of the polarized light spectroscope and the dichroic mirrors after passing through the polarization converter for being divided into three primary colors of red, green and blue; the paths of the color light are provided with the dichroic mirrors aiming at different color light or absorption type filter lenses for reflecting and absorbing stray light; the paths of the color light are also provided with the corresponding liquid crystal panels for causing the color light to be backwards reflected in the polarized light spectroscope along the original light paths for being synthesized and forming emergence light, and an image is generated by a projection objective lens.
Description
Technical field
The invention relates to a kind of light path system, and particularly relevant for a kind of light path system of reflecting liquid crystal projector.
Technical background
Liquid crystal display cells in recent years is being widely used in the daily life gradually, as LCD TV, laptop computer and liquid crystal projector etc.Optical-mechanical system in the general liquid crystal projector optical projection system can be divided into from shaft type (Off axial) and two kinds of designs of following formula (On line), so-called design from shaft type means its incident light source and outgoing light source not on same surface level, and the design of axle following formula refers to that then its incident light source and outgoing light source are on same surface level.And at present the projection pattern of liquid crystal projector can be divided into two kinds of pre-projecting type and back projection types, and the design of a following formula is adopted in the design of liquid crystal back projecting projector now 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 light path system synoptic diagram of optical-mechanical system in the traditional reflecting liquid crystal projector.Light source 102 outgoing one white light 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 through a polarization converter (S-P Converter) back.White light WS reflexes to a dichroic mirror 106 through a reflecting surface mirror 104, and (DichroicMirror, DM), dichroic 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, relend by the ruddiness RS of polarisation spectroscope 110 and reflex on the red liquid crystal panel 112 the S polarization by a reflecting surface mirror 108.And the indigo plant, green mixed light of reflection (BS, GS) (BS GS) is divided into the blue light BS that a green glow GS and who reflects penetrates with indigo plant, green mixed light via a dichroic mirror 114 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 screen (not shown) via a two-way prism 124 (X-cube, Dichroic prism) by a projection objective 126 (Projector Lens).
Then please refer to Fig. 2, it is the light path system synoptic diagram of optical-mechanical system in the traditional another kind of reflecting liquid crystal projector.Light source 202 outgoing one white light in the optical-mechanical system 200, the white light WS of formation one S polarization behind a polarization converter.White light WS converts the green glow GP of P polarization kenel to through the green glow GS that can make S polarization kenel among the white light WS after the optical selector (Color Selector) 203, but do not influence the S polarization kenel of ruddiness RS and blue light BS, make and pass the ruddiness RS of optical selector 203 light afterwards by S polarization kenel, the green glow GP of blue light BS and P polarization kenel forms, white light WS enter a polarisation spectroscope 204 (Polarizing Beam Spliter, PBS), an one two-way Amici prism 206 and a glass prism 207 (Glass Cube) are with ruddiness R, green glow G, blue light B is projected to red liquid crystal panel 208 respectively, on green liquid crystal panel 210 and the blue liquid crystal panel 212.Reflect ruddiness R, green glow G and blue light B by red liquid crystal panel 208, green liquid crystal panel 210, blue liquid crystal panel 212 respectively more at last, close light after be projected on the screen by a projection objective according to original light path.
Summary of the invention
Yet, light path system in the above-mentioned traditional reflecting liquid crystal projector is divided into Red Green Blue by dichroic mirror (DM) and polarisation spectroscope (PBS) with light source, each coloured light still contains the veiling glare of other colors, these veiling glares are not controlled by the heat problem that liquid crystal panel can cause each light path, impel liquid crystal panel stronger veiling glare influence contrast when dark attitude (Dark State), to occur, and it is impure to occur colourity when bright attitude (BrightState), even influences the penetrance of optical element because of heat problem.
In addition, in the light path system among traditional Fig. 1, use three polarisation spectroscopes and a two-way prism (X-Cube), used four prisms altogether.And in the light path system in Fig. 2, used a polarisation spectroscope (PBS), two-way Amici prism and a glass prism (Glass Cube) altogether, used three prisms altogether.Therefore with regard to whole optical-mechanical system, not only weight can be very heavy when using three to four prisms, and also can be comparatively expensive on the price.
Therefore, purpose of the present invention is proposing a kind of light path system, utilizes dichroic mirror collocation polarisation spectroscope as beam splitting system, so that the parasitic reflection in the optical-mechanical system is gone out outside the optical-mechanical system, and then improves the heat problem of each light path.
Another object of the present invention is proposing a kind of light path system, utilizes dichroic mirror collocation polarisation spectroscope as beam splitting system, to reduce the price and the weight of optical-mechanical system.
For reaching above-mentioned purpose of the present invention, a kind of light path system is proposed for to make light source become S polarization kenel through a polarization converter one light source, again via an optical selector the green glow in this light source being converted to P polarization kenel (GP), and ruddiness, blue light still be S polarization kenel (RS, BS).Then green glow GP, ruddiness RS and blue light BS are via a polarisation spectroscope, and ruddiness RS, blue light BS reflect so that this green glow GP penetrates.Ruddiness RS, the blue light BS of reflection are again through a dichroic mirror, so that ruddiness RS, blue light BS are separated.Then several absorption optical filtering or dichroic mirrors of device on the light path of green glow GP, ruddiness RS, blue light BS absorb or reflect outside the optical-mechanical system with the veiling glare with each coloured light.Then green glow GS, the ruddiness RP that reflects via liquid crystal panel of all kinds, blue light BP close light and convert the green glow GS of S polarization kenel the green glow GP of P polarization kenel to by an optical selector via the polarisation optical splitter, and last green glow GP, ruddiness RP, blue light BP produce image via projection objective again.
For reaching above-mentioned purpose of the present invention, a kind of light path system is proposed, it is for to make light source become S polarization kenel through a polarization converter one light source, again via a polarisation spectroscope, with with on source reflection to a dichroic mirror, this dichroic mirror can make green glow GS reflection, and ruddiness RS, blue light BS penetrate.Afterwards, so that parasitic reflection is gone out outside the system, and the ruddiness RS that penetrates, blue light BS tell ruddiness RS, blue light BS with a dichroic mirror green glow GS of reflection again through a dichroic mirror.Then green glow GP, the ruddiness RP that is reflected by liquid crystal panel of all kinds, blue light BP relend by projection objective generation image after closing light via the polarisation optical splitter.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail below:
Description of drawings
Fig. 1 is the light path system synoptic diagram of optical-mechanical system in the traditional reflecting liquid crystal projector;
Fig. 2 is the light path system synoptic diagram of optical-mechanical system in the traditional another kind of reflecting liquid crystal projector;
Fig. 3 is the light path system synoptic diagram according to optical-mechanical system in the first embodiment of the invention reflecting liquid crystal projector;
Fig. 4 is the light path system synoptic diagram according to optical-mechanical system in the second embodiment of the invention reflecting liquid crystal projector;
Fig. 5 is the light path system synoptic diagram according to optical-mechanical system in the third embodiment of the invention reflecting liquid crystal projector; And
Fig. 6 is the light path system synoptic diagram according to optical-mechanical system in the fourth embodiment of the invention reflecting liquid crystal projector.
The simple declaration of label:
100,200,600: optical-mechanical system
102,202,602: light source
104,108: the reflecting surface mirror
106,114: dichroic mirror
110,116,120,204,604: the polarisation spectroscope
112,208,608: the red liquid crystal panel
118,210,610: the green liquid crystal panel
122,212,612: the blue liquid crystal panel
124: two-way prism
206,606: two-way Amici prism
207: glass prism
300,400,500: optical-mechanical system
302,402,502: light source
203,303,403,603,320,420: optical selector
304,404,504: the polarisation spectroscope
306,308,3 12,316,406,408,412,416,506,508,512: dichroic mirror
309,313,316,509: veiling glare
310,410,510: the green liquid crystal panel
314,414,514: the red liquid crystal panel
318,418,516: the blue liquid crystal panel
607: two-way Amici prism
Embodiment
Please refer to Fig. 3, it is the light path system synoptic diagram according to optical-mechanical system in the reflecting liquid crystal projector of first embodiment of the invention.Light source 302 outgoing one white light in the optical-mechanical system 300 so that ultraviolet light in the light source 302 and infrared light are filtered, forms the white light WS of a S polarization through an optical filtering (not shown) again through a polarization converter (S-P Converter) back.White light WS converts the green glow GP of P polarization kenel to through the green glow GS that can make S polarization kenel among the white light WS after the optical selector (ColorSelector) 303, but do not influence the S polarization kenel of ruddiness RS and blue light BS, make that passing optical selector 303 light afterwards is made up of ruddiness RS, the blue light BS of S polarization kenel and the green glow GP of P polarization kenel.
Please refer to Fig. 3 equally, through ruddiness RS, blue light BS and the green glow GP after the optical selector 303, again through a polarisation spectroscope 304 so that ruddiness RS and blue light BS reflect, and green glow GP is penetrated.Wherein, the green glow GP after penetrating can be through a dichroic mirror 308, with the veiling glare among the green glow GP 309 penetrating outside the optical-mechanical system 300, and the green glow GP that penetrates after the dichroic mirror 308 can arrive on the green liquid crystal panel 310.And ruddiness RS that is reflected by polarisation spectroscope 304 and blue light BS can be through dichroic mirrors 306, so that ruddiness RS penetrates, blue light BS reflection.The ruddiness RS that penetrates can so that the veiling glare among the ruddiness RS 313 is reflected outside the optical-mechanical system 300, can arrive on the red liquid crystal panel 314 and penetrate dichroic mirror 312 ruddiness RS afterwards through a dichroic mirror 312.Blue light BS via dichroic mirror 306 reflections can so that the veiling glare among the blue light BS 317 is reflected outside the optical-mechanical system 300, can arrive on the blue liquid crystal panel 318 and penetrate dichroic mirror 316 blue light BS afterwards through a dichroic mirror 316.
At last, reflect the opposite red R P of polarization kenel, green GS and blue BP coloured light respectively by red liquid crystal panel 314, green glow liquid crystal panel 310 and blue liquid crystal panel 318, and directly get back in the polarisation spectroscope 304 along original optical path and to close light, afterwards again through an optical selector 320, formation is all the red R P of P polarization kenel, green GP and blue BP, and via the imaging of projection objective (not shown).
Please refer to Fig. 4, it is the light path system synoptic diagram according to optical-mechanical system in the second embodiment of the invention reflecting liquid crystal projector.Light source 402 outgoing one white light in the optical-mechanical system 400, through an optical filtering (not shown) so that ultraviolet light in the light source 402 and infrared light are filtered, again through forming the white light WS of a S polarization behind the polarization converter.White light WS converts the green glow GP of P polarization kenel to through the green glow GS that can make S polarization kenel among the white light WS after the optical selector 403, but do not influence the S polarization kenel of ruddiness RS and blue light BS, make that passing optical selector 403 light afterwards is made up of ruddiness RS, the blue light BS of S polarization kenel and the green glow GP of P polarization kenel.
Please refer to Fig. 4 equally, through ruddiness RS, blue light BS and the green glow GP after the optical selector 403, again through a polarisation spectroscope 404 so that ruddiness RS and blue light BS reflect, and green glow GP is penetrated.Wherein, the green glow GP after penetrating can so that the veiling glare among the green glow GP is absorbed, can arrive on the green liquid crystal panel 410 and penetrate absorption optical filtering 408 green glow GP afterwards through an absorption optical filtering 408.And ruddiness RS that is reflected by polarisation spectroscope 404 and blue light BS can be through dichroic mirrors 406, so that ruddiness RS penetrates, blue light BS reflection.The ruddiness RS that penetrates can so that the veiling glare among the ruddiness RS is absorbed, can arrive on the red liquid crystal panel 414 and penetrate absorption optical filtering 412 ruddiness RS afterwards through an absorption optical filtering 412.Blue light BS via dichroic mirror 406 reflections can so that the veiling glare among the blue light BS is absorbed, can arrive on the blue liquid crystal panel 418 and penetrate absorption optical filtering 416 blue light BS afterwards through an absorption optical filtering 416.
At last, reflect the opposite red R P of polarization kenel, green GS and blue BP coloured light respectively by red liquid crystal panel 414, green glow liquid crystal panel 410 and blue liquid crystal panel 418, and directly get back in the polarisation spectroscope 404 along original optical path and to close light, afterwards again through an optical selector 420, formation is all the red R P of P polarization kenel, green GP and blue BP, and via the imaging of projection objective (not shown).
Please refer to Fig. 5, it is the light path system synoptic diagram according to optical-mechanical system in the third embodiment of the invention reflecting liquid crystal projector.Light source 502 outgoing one white light in the optical-mechanical system 500, through an optical filtering (not shown) so that ultraviolet light in the light source 502 and infrared light are filtered, again through forming the white light WS of a S polarization behind the polarization converter.White light WS makes ruddiness RS, green glow GS and blue light BS among the white light WS all reflect polarisation spectroscope 504 through a polarisation spectroscope 504, and ruddiness RS, the green glow GS and the blue light BS that reflect after the polarisation spectroscope 504 can be through dichroic mirrors 506, so that ruddiness RS and blue light BS penetrate, and green glow GS reflection.
Wherein, the green glow GS of reflection can so that veiling glare 509 is reflected outside the optical-mechanical system 500, arrive on the green liquid crystal panel 510 at last through a dichroic mirror 508.And ruddiness RS that penetrates and blue light BS can be again through dichroic mirrors 512, so that ruddiness RS penetrates, blue light BS reflection.Wherein, penetrate dichroic mirror 512 ruddiness RS afterwards and can arrive on the red liquid crystal panel 514, and can arrive on the blue liquid crystal panel 516 via the blue light BS after dichroic mirror 512 reflections.
At last, reflect the opposite red R P of polarization kenel, green GP and blue BP coloured light respectively by red liquid crystal panel 514, green glow liquid crystal panel 510 and blue liquid crystal panel 516, and directly get back in the polarisation spectroscope 304 along original optical path and to close light, form and be all the red R P of P polarization kenel, green GP and blue BP.At last again via the projection objective imaging.
Please refer to Fig. 6, it is the light path system synoptic diagram according to optical-mechanical system in the fourth embodiment of the invention reflecting liquid crystal projector.Light source 602 outgoing one white light in the optical-mechanical system 600, the white light WS of formation one S polarization behind a polarization converter.White light WS converts the green glow GP of P polarization kenel to through the green glow GS that can make S polarization kenel among the white light WS after the optical selector (ColorSelector) 603, but do not influence the S polarization kenel of ruddiness RS and blue light BS, make that passing optical selector 603 light afterwards is made up of ruddiness RS, the blue light BS of S polarization kenel and the green glow GP of P polarization kenel.
White light WS enters a polarisation spectroscope 604 so that the ruddiness R among the white light WS and blue light B reflection, green glow G are penetrated.One two-way Amici prism 606 is positioned on the light path of reflect red R and blue light B, blue light B reflection, ruddiness R is penetrated again, and a two-way Amici prism 607 (Dichroic Cube) then is positioned on the light path that penetrates green glow G, so that the veiling glare among the green glow G is filtered out.Be projected to respectively on red liquid crystal panel 608, green liquid crystal panel 610 and the blue liquid crystal panel 612 with ruddiness R, green glow G and the blue light B that two-way Amici prism 607 is told through polarisation spectroscope 604, 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,, be projected on the screen via a projection objective according to after original light path gets back to polarisation spectroscope 604 neutralizing lights.
In the present embodiment glass prism among traditional Fig. 2 207 is replaced as two-way Amici prism 607, parasitic reflection gone out purpose outside the optical-mechanical system further to reach.
In sum, the present invention has following advantage at least:
1. the present invention utilizes dichroic mirror collocation polarisation spectroscope as beam splitting system, so that the parasitic reflection in the optical-mechanical system is gone out outside the optical-mechanical system, and then improves the heat problem of each light path.
2. the present invention utilizes polarisation spectroscope of a plurality of dichroic mirror collocation as beam splitting system, only uses a prism, therefore can reduce weight and price in the optical-mechanical system.
Though the present invention discloses as above with a preferred embodiment; right its is not in order to qualification the present invention, any insider, without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking the accompanying Claim scope person of defining.
Claims (12)
1. a light path system is suitable for being applied in the optical-mechanical system of reflecting liquid crystal projector, and light source is divided into one first primitive color light, one second primitive color light and a primaries, this light path system comprises at least:
One first optical selector is installed on the light path of this light source, with the polarization kenel conversion with this first primitive color light in this light source;
One polarisation spectroscope is installed on the light path of this light source after this optical selector, so that this first primitive color light penetrates, this second primitive color light reflects with this primaries;
One first dichroic mirror is installed on the light path of this second primitive color light of reflection after this polarisation spectroscope and this primaries, so that this second primitive color light penetrates, and reflects this primaries;
One second dichroic mirror is installed on the light path of this first primitive color light after this polarisation spectroscope, with the elimination veiling glare;
One the 3rd dichroic mirror is installed on the light path of this second primitive color light after this first dichroic mirror, with the elimination veiling glare;
One the 4th dichroic mirror is installed on the light path of this primaries after this first dichroic mirror, with the elimination veiling glare;
One first primitive color light liquid crystal panel is installed on the light path of this first primitive color light after this second dichroic mirror, to reflect this first primitive color light;
One second primitive color light liquid crystal panel is installed on the light path of this second primitive color light after the 3rd dichroic mirror, to reflect this second primitive color light;
One primaries liquid crystal panel is installed on the light path of this primaries after the 4th dichroic mirror, to reflect this primaries; And
One second optical selector is installed on the light path of this emergent light after this polarisation spectroscope, so that the polarization kenel of this first primitive color light is changed once again.
2. light path system as claimed in claim 1, wherein Fan She this first primitive color light, second primitive color light and primaries close light by this polarisation spectroscope, to form an emergent light.
3. light path system as claimed in claim 2 more comprises a projection objective, is installed on the light path of this emergent light after this second optical selector.
4. a light path system is suitable for being applied in the optical-mechanical system of reflecting liquid crystal projector, and light source is divided into one first primitive color light, one second primitive color light and a primaries, this light path system comprises at least:
One first optical selector is installed on the light path of this light source, with the polarization kenel conversion with this first primitive color light in this light source;
One polarisation spectroscope is installed on the light path of this light source after this optical selector, so that this first primitive color light penetrates, this second primitive color light reflects with this primaries;
One first dichroic mirror is installed on the light path of this second primitive color light of reflection after this polarisation spectroscope and this primaries, so that this second primitive color light penetrates, and reflects this primaries;
One first absorption optical filtering is installed on the light path of this first primitive color light after this polarisation spectroscope, to absorb veiling glare;
One second absorption optical filtering is installed on the light path of this second primitive color light after this first dichroic mirror, to absorb veiling glare;
One the 3rd absorption optical filtering is installed on the light path of this primaries after this first dichroic mirror, to absorb veiling glare;
One first primitive color light liquid crystal panel is installed on the light path of this first primitive color light after this first absorption optical filtering, to reflect this first primitive color light;
One second primitive color light liquid crystal panel is installed on the light path of this second primitive color light after this second absorption optical filtering, to reflect this second primitive color light;
One primaries liquid crystal panel is installed on the light path of this primaries after the 3rd absorption optical filtering, to reflect this primaries; And
One second optical selector is installed on the light path of this emergent light after this polarisation spectroscope, so that the polarization kenel of this first primitive color light is changed once again.
5. light path system as claimed in claim 4, wherein Fan She this first primitive color light, second primitive color light and primaries close light by this polarisation spectroscope, to form an emergent light.
6. light path system as claimed in claim 5 more comprises a projection objective, is installed on the light path of this emergent light after this second optical selector.
7. a light path system is suitable for being applied in the optical-mechanical system of reflecting liquid crystal projector, and light source is divided into one first primitive color light, one second primitive color light and a primaries, this light path system comprises at least:
One polarisation spectroscope is installed on the light path of this light source, so that this source reflection;
One first dichroic mirror is installed on the light path of this light source after this polarisation spectroscope, so that this first primitive color light reflection, this second primitive color light and primaries penetrate;
One second two-way beam split minute surface is installed on the light path of this second primitive color light that penetrates and primaries after this first dichroic mirror, so that this second primitive color light penetrates, this primaries reflection;
One the 3rd dichroic mirror is installed on the light path of first primitive color light of this reflection after this first dichroic mirror, with the elimination veiling glare;
One first primitive color light liquid crystal panel is installed on the light path of this first primitive color light after this second dichroic mirror, to reflect this first primitive color light;
One second primitive color light liquid crystal panel is installed on the light path of this second primitive color light after the 3rd dichroic mirror, to reflect this second primitive color light; And
One primaries liquid crystal panel is installed on the light path of this primaries after the 3rd dichroic mirror, to reflect this primaries.
8. light path system as claimed in claim 7, wherein this first primitive color light, second primitive color light and primaries close light by this polarisation spectroscope, to form an emergent light.
9. light path system as claimed in claim 8 more comprises a projection objective, is installed on the light path of this emergent light after this polarisation spectroscope.
10. a light path system is suitable for being applied in the optical-mechanical system of reflecting liquid crystal projector, and light source is divided into one first primitive color light, one second primitive color light and a primaries, this light path system comprises at least:
One polarisation spectroscope is installed on the light path after this light source, so that this first primitive color light penetrates, this second primitive color light reflects with this primaries;
One first two-way Amici prism is installed on the light path of this first primitive color light that penetrates after this polarisation spectroscope, with the elimination veiling glare;
One second two-way Amici prism is installed on the light path of this light source after this polarisation spectroscope, so that this second primitive color light penetrates, and makes this primaries reflection;
One first primitive color light liquid crystal panel is installed on the light path of this first primitive color light after this first two-way Amici prism, to reflect this first primitive color light;
One second primitive color light liquid crystal panel is installed on the light path of this second primitive color light after this second two-way Amici prism, to reflect this second primitive color light; And
One primaries liquid crystal panel is installed on the light path of this primaries after this second two-way Amici prism, to reflect this primaries.
11. light path system as claimed in claim 10, wherein this first primitive color light, second primitive color light and primaries close light by this polarisation spectroscope, to form an emergent light.
12. light path system as claimed in claim 11 more comprises a projection objective, is installed on the light path of this emergent light after this polarisation spectroscope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011015780A CN1157623C (en) | 2001-01-22 | 2001-01-22 | Optical path design of optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011015780A CN1157623C (en) | 2001-01-22 | 2001-01-22 | Optical path design of optical system |
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| CN1367396A CN1367396A (en) | 2002-09-04 |
| CN1157623C true CN1157623C (en) | 2004-07-14 |
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| CNB011015780A Expired - Fee Related CN1157623C (en) | 2001-01-22 | 2001-01-22 | Optical path design of optical system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI472865B (en) | 2012-05-21 | 2015-02-11 | Delta Electronics Inc | Illumination system |
| DE102012219387B4 (en) * | 2012-10-24 | 2022-03-24 | Coretronic Corporation | Lighting device with pumped light source and phosphor arrangement and method for operating such a lighting device |
| CN108076330B (en) * | 2016-11-17 | 2019-09-20 | 深圳光峰科技股份有限公司 | Projection display apparatus |
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