CN1549000A - Projection display device - Google Patents
Projection display device Download PDFInfo
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- CN1549000A CN1549000A CNA031306721A CN03130672A CN1549000A CN 1549000 A CN1549000 A CN 1549000A CN A031306721 A CNA031306721 A CN A031306721A CN 03130672 A CN03130672 A CN 03130672A CN 1549000 A CN1549000 A CN 1549000A
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- projection display
- display equipment
- photoconductive tube
- light
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Abstract
The present invention provides one kind of projecting display device. The position of light source or light conducting tube in the optical system is altered to deviate from the optical axle for certain distance, so that the transmitted light produced by the virtual arced array of light conducting tube is changed from symmetric distribution to asymmetric distribution in increased irradiance homogeneity.
Description
Technical field
The present invention relates to a kind of projection display equipment, particularly relate to the projection display equipment that a kind of use digit optical is handled (DLP, Digital Light Processing) technology.
Background technology
The ultimate principle of liquid crystal projector is to utilize liquid crystal display (LCD, Liquid Crystal Display) the module light that comes modulation to come out by light emitted, in order to allow the accurate projection of LCD Liquid Crystal Module energy go out the color of image, light need be separated into R, G, B three looks are controlled respectively, again R, G, B three looks are merged afterwards, utilize projection lens to be projected in the screen.Liquid crystal projector can be divided into two kinds of penetration liquid crystal panel and reflection type liquid crystal panels again if distinguish according to the mode of using liquid crystal panel.
The inner main assembly of penetration liquid crystal projector is liquid crystal panel and is used for the dichroic mirror of branch actinic light.Light is sent by light source module, dichroic mirror through beam split is divided into R, G, three kinds of colors of B with light source, and these three kinds of colors are respectively by after three liquid crystal panel control modulations, before the projection camera lens, three kinds of colors are merged, see through projector lens again and be projected in the screen by light-combining prism.
Fig. 1 shows the Organization Chart of reflecting liquid crystal projector.Opaque projector is except liquid crystal panel and penetration different, and maximum difference has been more than the opaque projector one group of polarization spectroscope.The light that light source 110 penetrates is via catoptron 120 refractions, after double-colored dichronic mirror 130 color separations of process, project in the polarization spectroscope 140, again via returning after the reflection of reflection type liquid crystal panel 150 modulation light, handle the light that reflects by polarization spectroscope 140 equally again, and then, project screen via projector lens 170 via three kinds of colors of light-combining prism 160 merging.
The optical system of opaque projector is utilized lens module to concentrate from the scattered light of light source and is produced parallel beam, the illumination that is incident upon on the object plane and produces uniform strength.The existing opaque projector of DLP technology that adopts is more many than previous improvement on the uniformity coefficient of projected light beam, and whether present problem is for strengthening being incident upon the uniformity coefficient of the projected light beam on the object again under the hardware structure that does not change present opaque projector.
Summary of the invention
The object of the present invention is to provide a kind of projection display equipment, by changing the position of light source or photoconductive tube, make it depart from both set a distances of optical axis one, make the transmitted light of the virtual arc array that produces via photoconductive tube be asymmetric distribution, to strengthen the uniformity coefficient of illumination.
Based on above-mentioned purpose, the invention provides a kind of projection display equipment, it comprises an optical system, this optical system comprises a light source, a photoconduction light, a lens module, a digital micro-mirror device and a projecting plane.Limit an optical axis along a first direction, photoconductive tube is to be provided with this optical axis disalignment mode, and its second direction towards vertical first direction departs from both set a distances of optical axis one.Utilize this light emitted light, photoconductive tube receives the light of this light source, and produces the transmitted light of the virtual arc array of asymmetric distribution.
Description of drawings
Fig. 1 is the Organization Chart of existing reflecting liquid crystal projector;
Fig. 2 is the true Organization Chart of projection display equipment of the present invention;
Fig. 3 A～Fig. 3 B is a projection display equipment of the present invention, and the deflection mirror surface that it utilizes digital micro-mirror device makes light refraction and produces the catoptrical synoptic diagram of different angles;
Fig. 4 is the transmitted light synoptic diagram of existing opaque projector via the virtual arc array of the symmetrical distribution of photoconductive tube generation;
Fig. 5 is the transmitted light synoptic diagram of projector of the present invention via the virtual arc array of the asymmetric distribution of photoconductive tube generation.
Embodiment
For above and other objects of the present invention, feature and advantage can be become apparent, cited below particularlyly go out preferred embodiment, and cooperate institute's accompanying drawing, do following detailed description.
The invention provides a kind of projection display equipment that produces the transmitted light of the virtual arc array of asymmetric distribution.
Projection display equipment of the present invention is for adopting the liquid crystal projector of DLP technology.DLP projector is a kind of projection display of special light sources modulation mode, utilize digital micro-mirror device (DMD, DigitalMicromirror Device) catoptron on the chip comes reflection ray (having 500,000 small eyeglasses on the digital micro-mirror device chip), image is throwed away again.Different with penetration crystal projection technology, DLP belongs to reflection type liquid crystal shadow casting technique.
Fig. 2 is the Organization Chart of projection display equipment of the present invention.Framework of the present invention comprises a light source 200, a condenser lens 210, a colour wheel 215, a photoconductive tube 220, a lens module 230, first mirror surface 240, one second mirror surface 245, a digital micro-mirror device 250 and a projecting plane 260.At first, limit the optical axis 300 of the optical system in this projection display equipment along a first direction, optical axis 300 is meant the path, axle center of light source.In the existing optical system, optical module such as photoconductive tube or lens module etc., it is all placed along optical axis, and the central point of optical module is positioned at same online always with optical axis.
And in the present invention, photoconductive tube is to be provided with this optical axis disalignment mode.In order to describe present embodiment in detail, limit a first direction, a second direction and a third direction earlier at this.First direction 1 limits according to an axial direction on light source 200 parallel XY planes, and second direction 2 and third direction 3 are the Z axial direction.Make light source 200 and photoconductive tube 220 out-of-alignment modes have two: the position of (1) mobile light source 200, it is moved towards third direction 3, and both set a distance of the optical axis 300 1 that departs from optical system; (2) position of mobile photoconductive tube 220 makes it move towards second direction 2, and both set a distance of the optical axis 300 1 that departs from optical system.Wherein photoconductive tube 220 courts move with respect to the reverse of light source 200, and aforementioned both set a distances are between 0.3 to 0.7 millimeter.
In the present embodiment, the light that penetrates when light source 200 by R, G, B three-colour filter colour wheel 215, and is injected photoconductive tube 220 by the focusing of condenser lens 210.Photoconductive tube 220 receives the light from light source 200, disperses and produces the transmitted light of the virtual arc array of asymmetric distribution via lens module 230.Then, after first mirror surface 240 and 245 reflections of second mirror surface, then be incident on the digital micro-mirror device 250.DLP projector is the deflection that utilizes the mirror surface on the digital micro-mirror device, makes incident light produce the reflection deviation of different angles, and reaches the effect of reflection light point ON-OFF.
Being simply described as follows of mirror surface operation.
(1) formation of screen spot: when adding that positively biased is pressed on the deflecting driving circuit of catoptron 300, make catoptron 300 deflections+10 degree, the light beam of light source 310 is incident on the catoptron 300, make the reflected light of catoptron 300 enter projection lens 330 fully through suitable light path arrangement, and with a certain position of light beam projecting on screen, form a luminous point, promptly so-called " ON ", as shown in Figure 3A.
(2) disappearance of screen spot: if on the driving circuit of catoptron 300, add a negative bias signal, catoptron 300 is spent deflection-10 so, the incident beam of light source 310 will no longer enter in the range of receiving of projection lens 330, opposite position promptly can not produce luminous point on the screen, this promptly is so-called " OFF ", shown in Fig. 3 B.
Each catoptron on the digital micro-mirror device 250 is a pixel, all there are an internal memory and driving circuit corresponding with it under each catoptron, the internal memory of each pixel can write down the signal digital value of this pixel, and with digital signal give drive electrode produce tiny mirror deflection, make the reflected light of catoptron enter projection lens fully through suitable light path arrangement, at last image is projeced on the projecting plane 260.
In the prior art, compare with the penetration projection display equipment, the transmitted light of the virtual arc array that the reflection type projection display device is produced is symmetrical distribution, and (as shown in Figure 4), its illumination and uniformity coefficient are existing to be improved.Yet reflection type projection display device of the present invention is by changing the position of light source and photoconductive tube, makes the transmitted light of the virtual arc array that produces via photoconductive tube be asymmetric distribution (as shown in Figure 5), can improve the uniformity coefficient of light again.
Though disclosed the present invention in conjunction with above preferred embodiment; yet it is not in order to limit the present invention; any those skilled in the art can be used for a variety of modifications and variations without departing from the spirit and scope of the present invention, so protection scope of the present invention should be with being as the criterion that claim was defined.
Claims (9)
1. projection display equipment, it comprises an optical system, above-mentioned optical system also comprises:
One light source in order to launch a light, limits an optical axis along a first direction; And
One photoconductive tube, to be provided with this optical axis disalignment mode, above-mentioned photoconductive tube receives the above-mentioned light of above-mentioned light source, and produces a transmitted light of a virtual arc array;
Wherein, above-mentioned photoconductive tube departs from both set a distances of above-mentioned optical axis one towards a second direction of vertical above-mentioned first direction, makes the above-mentioned transmitted light of the above-mentioned virtual arc array of above-mentioned photoconductive tube generation be asymmetric distribution.
2. projection display equipment as claimed in claim 1, wherein, above-mentioned photoconductive tube departs from above-mentioned both set a distances of above-mentioned optical axis between 0.3 to 0.7 millimeter.
3. projection display equipment as claimed in claim 1 wherein, also comprises a condenser lens, its between above-mentioned light source and above-mentioned photoconductive tube, in order to the convergence of rays of above-mentioned light source in above-mentioned photoconductive tube.
4. projection display equipment as claimed in claim 1, wherein, above-mentioned photoconductive tube comprises a lens module, it then sends the above-mentioned transmitted light of homogenising in order to receive from the converging ray of above-mentioned condenser lens and to make its homogenising.
5. projection display equipment as claimed in claim 1 wherein, also comprises a relay lens module and a projection plane, utilize above-mentioned relay lens module relaying from the above-mentioned transmitted light of above-mentioned photoconductive tube to above-mentioned projection plane.
6. projection display equipment as claimed in claim 5, wherein, above-mentioned relay lens module comprises a spherical lens (spherical lens) and a non-spherical lens (aspheric lens).
7. projection display equipment as claimed in claim 1, wherein, above-mentioned projection display equipment is that a digital light is handled projector.
8. projection display equipment as claimed in claim 1, wherein, above-mentioned first direction limits according to an axial direction on the parallel XY of above-mentioned light source plane, and above-mentioned second direction is the Z direction.
9. projection display equipment as claimed in claim 1, wherein, above-mentioned photoconductive tube is towards oppositely departing from respect to above-mentioned light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031306721A CN1549000A (en) | 2003-05-07 | 2003-05-07 | Projection display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031306721A CN1549000A (en) | 2003-05-07 | 2003-05-07 | Projection display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1549000A true CN1549000A (en) | 2004-11-24 |
Family
ID=34322649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031306721A Pending CN1549000A (en) | 2003-05-07 | 2003-05-07 | Projection display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1549000A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7494253B2 (en) | 2005-09-23 | 2009-02-24 | Qisda Corporation | Projection system and light-guiding assembly thereof |
| CN101135831B (en) * | 2006-08-31 | 2010-05-12 | 明基电通股份有限公司 | Projection device |
| CN103034034A (en) * | 2011-10-09 | 2013-04-10 | 红蝶科技(深圳)有限公司 | Digital optical processing projection device provided with off-axis light-emitting diode (LED) light source |
-
2003
- 2003-05-07 CN CNA031306721A patent/CN1549000A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7494253B2 (en) | 2005-09-23 | 2009-02-24 | Qisda Corporation | Projection system and light-guiding assembly thereof |
| CN101135831B (en) * | 2006-08-31 | 2010-05-12 | 明基电通股份有限公司 | Projection device |
| CN103034034A (en) * | 2011-10-09 | 2013-04-10 | 红蝶科技(深圳)有限公司 | Digital optical processing projection device provided with off-axis light-emitting diode (LED) light source |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |