CN1588227A - Projection device with shading sheet - Google Patents
Projection device with shading sheet Download PDFInfo
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- CN1588227A CN1588227A CN 200410070334 CN200410070334A CN1588227A CN 1588227 A CN1588227 A CN 1588227A CN 200410070334 CN200410070334 CN 200410070334 CN 200410070334 A CN200410070334 A CN 200410070334A CN 1588227 A CN1588227 A CN 1588227A
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- micromirror
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Abstract
The invention is a projector with fin, for providing a video device able to eliminate optical noise and avoid the formation of imaging ghost, and it includes a light source structure providing light beam, a microlens structure, an imaging lens group and a fin to eliminate the optical noise; the microlens structure is arranged in the optical path of the light beam and has several array-arranged microlenses, each of which is switched between ON-state and OFF-state to regulate and control and reflect the light beam so as to make the light beam become an imaging light beam; the imaging lens group is arranged in the optical path of the imaging light beam to receive, focus and amplify the imaging light beam and focus and then project the imaging light beam and contains a first lens nearest the microlens structure; the fin is arranged between the imaging lens group and the microlens structure.
Description
Technical field
The invention belongs to image documentation equipment, particularly a kind of projection arrangement with anti-dazzling screen.
Background technology
In today that photoelectric technology happens suddenly and, on the market of display, the display of various different technologies presents the situation of letting a hundred schools contend.The status that various electricity are starched, LCD TV replaces traditional tv is gradually not only arranged, and so-called ' family's theater ' equipment has also caused agitation.Used DLP (Digital LightProcessing, the digital light processing) projection arrangement of technology promptly is a kind of extremely welcome at present family theater equipment, in addition, the DLP projection arrangement also directly is projeced into the picture of computer screen on the display screen because can be directly, making that meeting and bulletin are easier carries out, and has therefore also replaced the projection arrangement of conventional transparent film.And, used the inner projection televisor of DLP technology because more can reduce volume, and had the suitable market competitiveness than traditional tv.
So-called DLP digital light treatment technology (Digital Light Processing) is a kind of technology that can produce a series of digital light signals according to the electric signal of numeral, these digital light signals project on the display screen and not only can demonstrate continuous image, but and playing animation.
As shown in Figure 1, the projection arrangement 10 of known application DLP technology mainly comprises light-source structure 12, DMD (digital Micromirror device) chip 14 and imaging mirror group 16.
Light-source structure 12 is in order to provide light beam to dmd chip 14, and light beam can produce image strip via the reflection and the regulation and control of dmd chip 14.
Light-source structure 12 comprises light source 121, colour wheel 122, integration rod (light integrator) 123, light source mirror group 124, catoptron 125 and TIR (total internal reflection; Inner full-reflection) prism 126.
In known projection arrangement 10 shown in Figure 1, light path in the light source mirror group 124 becomes reverse and parallel with light path in the imaging mirror group 16, therefore need make light reflect about 90 ° and enter TIR prism 126 by catoptron 125, this in the known techniques in order to save the design of projection arrangement 10 overall volume.Certainly, also do not use catoptron 125, and with light source mirror group 124 and imaging mirror group 16 vertically disposed known techniques.
Except the basic framework shown in the projection arrangement 10 of above-mentioned application DLP technology, three dmd chips of use are also arranged in addition, every dmd chip is responsible for the projection arrangement of red, green, blue three-color light source respectively.
The core of DLP technology is dmd chip 14, and after the reflection of dmd chip 14, but the light beam that light source 121 is provided just becomes the image strip of projection imaging.So-called DMD is DigitalMicromirror Device, the abbreviation of digital micro-mirror chip architecture.
As shown in Figure 2, dmd chip 14 is by hundreds thousand of areas 14 * 14 μ m, and the micromirror 141 arrayed ground aggregation also littler than hair section forms, and each sheet micromirror 141 all has good reflection potential for light.
As shown in Figure 3, micromirror 141 is a square, and is that rotate in the axle center with the diagonal line of ab axle in the diagram.Micromirror 141 by A-A direction crosscut in shown in Figure 3, then can be obtained side view as shown in Figure 4.
As shown in Figure 4, micromirror 141 can deflect to the position with 12 ° of dmd chip 14 angles counterclockwise when " On " state, and this moment, incident light L0 can be reflected by micromirror 141, and reflected light R1 then can penetrate and in follow-up imaging via imaging mirror group 16.
Because each sheet micromirror 141 time just has only above-mentioned On and Off two states in running, only have 0 and 1 correspondingly with each bit of digital signal, so be suitable as very much the application of digital signal.
What deserves to be mentioned is that only when micromirror 141 being provided with 0 or 1 corresponding control voltage, micromirror 141 just can produce above-mentioned deflection.And when not having the situation of voltage effect, generally speaking, micromirror 141 is the parallel plane states that present with dmd chip 14, generally is referred to as not duty in known techniques, or the Flat state.
As shown in Figure 5, behind the image strip that imaging mirror group 16 receives from dmd chip 14, image strip can be focused on and is projeced into enlargedly on the display screen 24, and be formed into picture 26.In the dmd chip 14, the reflected light R1 that the micromirror 141 of " On " state is reflected (being the image strip of incident imaging mirror group 16) can be projeced into imaging 26 on the display screen 24 in follow-up.And in the dmd chip 14, the reflected light R2 that the micromirror 141 of " Off " state is reflected, its light path depart to avoid incident imaging mirror group 16, avoid imaging 26 is exerted an adverse impact.
Yet, when dmd chip 14 actual operations, become the micromirror 141 of ten thousand countings between " On " and " Off " two states, ceaselessly to switch, therefore can constantly have micromirror 141 in the process of deflection by " Off " warp " Flat " to " On ", perhaps by " On " warp " Flat " to " Off ".The result that micromirror 141 is ceaselessly switched between " On ", " Off " two states has caused in the projection arrangement of known DLP technology, and the light beam of not incident of part imaging mirror group 16 has still entered in the imaging mirror group 16 inevitably.Except the reflected light R1 at the ON state is that we want the picked image light beam, other reflected light that produces in transfer process all can be considered optical noise (bias light).Above-mentioned optical noise has caused so-called ' ghost (ghost image) '.As shown in Figure 5, on display screen 24, ghost 261 is formed at a jiao of imaging 26.Ghost 261 image for not had in the raw video data of imaging 26 is caused by the optical noise of the reflected light R1 of the non-micromirror 141 that belongs to the On state in the projection arrangement 10.
No matter ' ghost (ghost image) ' phenomenon is that projection arrangement is applied to the meeting bulletin for the projection arrangement of DLP technology, or is applied to the image demonstration of the class of family's theater, has all caused no small influence.
With the meeting bulletin, usually to the demand of its projection imaging with the lightness height, and picture is uncomplicated is basic demand, avoids causing meeting participant's mixed meat and fish dishes with simple clearly literal and lines.In the case, often have large stretch of pure color block in the picture, for example deceive in vain, entirely entirely etc., ghost then seems obvious especially in above-mentioned pure color block.
On the other hand, the ghost phenomenon is for the purposes that projection arrangement is applied to family's theater, because the image renewal rate is very fast when movie or animation, so the micromirror switching rate is also essential improves, so the probability that the ghost phenomenon occurs can be higher.But because the picture of its imaging is complicated, so ghost may be covered by the picture of complexity and more not obvious.But, for the projection arrangement of DLP technology, ghost is now as being a kind of adverse factors all the time, and is particularly all the more so on the monitor market of utmost point attention image display quality, if can not improve known ghost shortcoming, then the theatrical use projection arrangement competitiveness of product of family will be queried.
Therefore, according to the shortcoming of above-mentioned ' ghost (ghost image) ' the profound influence that projection arrangement caused to the DLP technology, for the research staff who is engaged in DLP technology association area, there's no one who doesn't or isn't be devoted to solve known techniques the shortcoming that still exists, in the hope of can further promoting the quality of projection arrangement product.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can eliminate optical noise, avoid being formed into projection arrangement with anti-dazzling screen as ghost.
The present invention includes in order to light-source structure, micromirror structure, imaging mirror group that the micromirror structure is provided light beam and the anti-dazzling screen that removes optical noise so as to screening; The micromirror structure is arranged on the light beam light path, and it has several micromirror that is provided with in the mode of arrayed, and each micromirror is switched between On state and Off state so as to regulation and control and folded light beam, makes beam reflection become can produce the image strip of image; Imaging mirror group is arranged on the image strip light path and after receiving image strip and focusing, amplification image strip is projected, and it comprises first mirror of the most close micromirror structure; Anti-dazzling screen is arranged between the micromirror structure of the imaging mirror group that receives image strip and reflected image light beam.
Wherein:
Anti-dazzling screen is arranged at the surface of the micromirror structure of the close reflected image light beam of imaging mirror group first mirror that receives image strip.
Anti-dazzling screen is arranged at imaging mirror group first mirror of reception image strip another surface away from the micromirror structure of reflected image light beam.
Anti-dazzling screen is arranged at the total micromirror of micromirror structure and is in the image strip upper limb light path of the not following reflection of state between the lower edge light path.
Anti-dazzling screen is arranged at the following position, image strip central optical path that the total micromirror of micromirror structure is in the not following reflection of state.
Owing to the present invention includes in order to light-source structure, micromirror structure, imaging mirror group that the micromirror structure is provided light beam and the anti-dazzling screen that removes optical noise so as to screening; The micromirror structure is arranged on the light beam light path, and it has several micromirror that is provided with in the mode of arrayed, and each micromirror is switched between On state and Off state so as to regulation and control and folded light beam, makes beam reflection become can produce the image strip of image; Imaging mirror group is arranged on the image strip light path and after receiving image strip and focusing, amplification image strip is projected, and it comprises first mirror of the most close micromirror structure; Anti-dazzling screen is arranged between the micromirror structure of the imaging mirror group that receives image strip and reflected image light beam.Utilize in the process that each sheet micromirror switches between " On " state and " Off " state, must cause the ghost of the follow-up imaging of projection arrangement for avoiding optical noise except that the anti-dazzling screen of optical noise through duty not according to effectively hiding of being provided with.Can eliminate optical noise, avoid being formed into the picture ghost, thereby reach purpose of the present invention.
Description of drawings
Fig. 1, be the projection arrangement structural representation front elevation of known application DLP technology.
Fig. 2, be dmd chip structural representation stereographic map.
Fig. 3, be single micromirror structural representation vertical view among Fig. 2.
A-A cut-open view among Fig. 4, Fig. 3.
Fig. 5, be dmd chip, imaging mirror group and the display screen structural representation stereographic map of known application DLP technology projection arrangement.
Fig. 6, for structural representation side view of the present invention.
Fig. 7, be all the reflected light path synoptic diagram of On state for the total micromirror of micro-mirror structure of the present invention.
Fig. 8, be all the reflected light path synoptic diagram of Flat state for the total micromirror of micro-mirror structure of the present invention.
Fig. 9, for the total micromirror of micro-mirror structure of the present invention when being all On and Flat state reflected light penetrate in the first mirror plane synoptic diagram.
Figure 10, for anti-dazzling screen of the present invention and imaging mirror group structural representation stereographic map.
Embodiment
As shown in Figure 6, the projection arrangement 40 of the present invention with anti-dazzling screen used DLP (digital lightprocessing; Digital light is handled) technology, it mainly comprises light-source structure 42, micromirror structure 44, imaging mirror group 46 and anti-dazzling screen 48.
Light-source structure 42 is in order to provide light beam to micromirror structure 44.
As shown in Figure 6, anti-dazzling screen 48 is arranged between micromirror structure 44 and the imaging mirror group 46, hide except that optical noise (bias light) by anti-dazzling screen 48, avoid optical noise to cause the present invention to have the ghost (ghost image) of the projection arrangement 40 follow-up imagings of anti-dazzling screen.
Light-source structure 42 comprises light source 421, colour wheel 422, integration rod (light integrator) 423, light source mirror group 424, catoptron 425 and TIR (total internal reflection; Inner full-reflection) prism 426.
As shown in Figure 6, the present invention has in the projection arrangement 40 of anti-dazzling screen, light path in the light source mirror group 424 becomes reverse and parallel with light path in the imaging mirror group 46, therefore enter TIR prism 426 by catoptron 425 is set so that light reflects about 90 °, this kind embodiment can be saved the volume of projection arrangement 40 integral body with anti-dazzling screen.In other enforcement formula, also can not use catoptron 425, for being familiar with projection arrangement correlation technique person, should all can be adjusted the arrangements of components in the light-source structure 42, with in various embodiment, still can reach and make the purpose of light beam with suitable angle incident micromirror structure 44.
The origin cause of formation of general inference ghost is constantly switched relevant with the micromirror in the micromirror structure, though when switching to the Off state, reflected light can not enter in the imaging mirror group, yet in micromirror by " Off " warp " Flat " to " On ", perhaps by " On " warp " Flat " to the transfer process of " Off ", still have light to be reflexed to imaging mirror group, and formed optical noise.
Therefore, the projection arrangement 40 that the present invention has an anti-dazzling screen utilizes in the process that each sheet micromirror switches between " On " state and " Off " state, must be foundation through duty (Flat) not, is provided with and can effectively hides the anti-dazzling screen 48 that removes above-mentioned optical noise.
As shown in Figure 7, the total micromirror of micromirror structure 44 is all the reflected light path of " On " state.
As shown in Figure 8, the total micromirror of micromirror structure 44 is all the reflected light path of " Flat " state.
Wherein, L1 represents the upper limb light path of individual states, the central optical path that L2 represents individual states, the lower edge light path that L3 then represents individual states.First mirror 461 of imaging mirror group 46 is at first accepted above-mentioned reflected light, and makes light beam enter imaging mirror group 46.
As shown in Figure 8, when anti-dazzling screen 48 is provided with, by micromirror structure 44 not during controlled voltage, total micromirror is under the situation of Flat state, find out reflected light light path at that time, and the upper limb light path L1 that anti-dazzling screen 48 is arranged on reflected light light path at that time is between the lower edge light path L3.Can find that the ghost in the projection arrangement imaging is eliminated significantly this moment.
Yet in various embodiment, micromirror structure 44 is different with the distance possibility of imaging mirror group 46, and therefore, as Fig. 7, shown in Figure 8, the ratio that " On " attitudinal reflexes light overlaps with " Flat " attitudinal reflexes light light path also can be different.It is high more that the reflected light light path of " On ", " Flat " state overlaps ratio, then needs the influence that reflected light caused of consideration to " On " state when anti-dazzling screen 48 is set more, avoids having influenced the display quality of projection arrangement on the contrary in order to eliminate ghost.
As shown in Figure 9, the total micromirror of micromirror structure 44 is all reflected light Lon of " On " state and the reflected light Lf of " Flat " state, and when being incident upon first mirror 461 of imaging mirror group 46, its light path has 50% coincidence approximately.In this case, if whole screening of the reflected light Lf of Flat state removed, then can cause the reflected light Lon deficiency of the On state of incident first mirror 461, and then influence follow-up imaging.
As shown in Figure 9, when anti-dazzling screen 48 was provided with, the central optical path L2 of reflected light Lf that can also " Flat " state was as reference point, and anti-dazzling screen 48 is arranged at position below the L2 of central optical path.Thus, can under the prerequisite that keeps the projection arrangement image quality, eliminate ghost effectively.
As shown in figure 10, anti-dazzling screen 48 is arranged at the surface of imaging mirror group 46 first mirrors 461 close micromirror structures 44.In other embodiment, also anti-dazzling screen 48 can be arranged at another surface (not shown) of first mirror 461, perhaps as shown in Figure 4, be arranged between the micromirror structure 44 and first mirror 461.
What deserves to be mentioned is, the present invention is arranged at anti-dazzling screen 48 light path of the reflected light Lf of Flat state, or on the part light path, and drop to minimum for the influence that makes 48 pairs of anti-dazzling screens have projection arrangement 40 imagings of anti-dazzling screen, then the present invention have anti-dazzling screen projection arrangement 40 in, need there be the reflected light of " On " state of 99.9%～70% can project projection arrangement 40 and do not covered by anti-dazzling screen 48 with anti-dazzling screen, change speech, when the total micromirror place " On " of micromirror structure 44 state, the screening rate of the image strip of 48 pairs of this moments of anti-dazzling screen needs below 30%.
In sum, the imaging that can improve known projection arrangement 10 of the projection arrangement 40 of the present invention with anti-dazzling screen has the shortcoming of ghost (ghost image).Wherein, spirit of the present invention is to utilize unique anti-dazzling screen 48 to remove the optical noise that causes ghost to hide, and the present invention is during with the not controlled voltage of micromirror structure 44, " Flat " state of its micromirror is to ask for the optimum position that anti-dazzling screen 48 is provided with, thus, even under the performance of various different projection arrangements, under the situation that imaging mirror group is different with the distance possibility of micromirror structure in for example various projection arrangements, still can utilize spirit of the present invention that anti-dazzling screen 48 is set, the invention provides purpose with projection arrangement of eliminating imaging ghost function thereby reach.
Claims (5)
1, a kind of projection arrangement with anti-dazzling screen, it comprises in order to the light-source structure that the micromirror structure is provided light beam, micromirror structure and imaging mirror group; The micromirror structure is arranged on the light beam light path, and it has several micromirror that is provided with in the mode of arrayed, and each micromirror is switched between On state and Off state so as to regulation and control and folded light beam, makes beam reflection become can produce the image strip of image; Imaging mirror group is arranged on the image strip light path and after receiving image strip and focusing, amplification image strip is projected, and it comprises first mirror of the most close micromirror structure; It is characterized in that being provided with the anti-dazzling screen that removes optical noise so as to hiding between the micromirror structure of the imaging mirror group of described reception image strip and reflected image light beam.
2, the projection arrangement with anti-dazzling screen according to claim 1 is characterized in that described anti-dazzling screen is arranged at the surface of the micromirror structure of the close reflected image light beam of imaging mirror group first mirror that receives image strip.
3, the projection arrangement with anti-dazzling screen according to claim 1 is characterized in that described anti-dazzling screen is arranged at imaging mirror group first mirror of reception image strip another surface away from the micromirror structure of reflected image light beam.
4,, it is characterized in that described anti-dazzling screen is arranged at the total micromirror of micromirror structure and is in the image strip upper limb light path of the not following reflection of state between the lower edge light path according to claim 1,2 or 3 described projection arrangements with anti-dazzling screen.
5,, it is characterized in that described anti-dazzling screen is arranged at the following position, image strip central optical path that the total micromirror of micromirror structure is in the not following reflection of state according to claim 1,2 or 3 described projection arrangements with anti-dazzling screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410070334 CN1588227A (en) | 2004-07-29 | 2004-07-29 | Projection device with shading sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410070334 CN1588227A (en) | 2004-07-29 | 2004-07-29 | Projection device with shading sheet |
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| CN1588227A true CN1588227A (en) | 2005-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200410070334 Pending CN1588227A (en) | 2004-07-29 | 2004-07-29 | Projection device with shading sheet |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101131532B (en) * | 2006-08-22 | 2010-05-26 | 台达电子工业股份有限公司 | Projection system and light chopper thereof |
| CN101859054A (en) * | 2009-04-13 | 2010-10-13 | 三洋电机株式会社 | The projection type video display device |
| CN103676426A (en) * | 2012-09-13 | 2014-03-26 | 扬明光学股份有限公司 | Projecting device and method for reducing stray light |
| CN108490719A (en) * | 2018-03-22 | 2018-09-04 | 青岛海信电器股份有限公司 | A kind of optical module and projection arrangement applied in projection arrangement |
| US11256164B2 (en) | 2020-03-12 | 2022-02-22 | Coretronic Corporation | Optical element and projection device using the same |
| US11914276B2 (en) | 2021-04-27 | 2024-02-27 | Coretronic Corporation | Optical engine module and projection device |
-
2004
- 2004-07-29 CN CN 200410070334 patent/CN1588227A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101131532B (en) * | 2006-08-22 | 2010-05-26 | 台达电子工业股份有限公司 | Projection system and light chopper thereof |
| CN101859054A (en) * | 2009-04-13 | 2010-10-13 | 三洋电机株式会社 | The projection type video display device |
| CN103676426A (en) * | 2012-09-13 | 2014-03-26 | 扬明光学股份有限公司 | Projecting device and method for reducing stray light |
| US9033521B2 (en) | 2012-09-13 | 2015-05-19 | Young Optics Inc. | Projection device and method for decreasing stray light |
| CN103676426B (en) * | 2012-09-13 | 2017-04-12 | 扬明光学股份有限公司 | Projecting device and method for reducing stray light |
| CN108490719A (en) * | 2018-03-22 | 2018-09-04 | 青岛海信电器股份有限公司 | A kind of optical module and projection arrangement applied in projection arrangement |
| US11256164B2 (en) | 2020-03-12 | 2022-02-22 | Coretronic Corporation | Optical element and projection device using the same |
| US11914276B2 (en) | 2021-04-27 | 2024-02-27 | Coretronic Corporation | Optical engine module and projection device |
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