CN1727938A - Light beam homogenizing device in laser projection television illuminating system - Google Patents
Light beam homogenizing device in laser projection television illuminating system Download PDFInfo
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- CN1727938A CN1727938A CN 200410009377 CN200410009377A CN1727938A CN 1727938 A CN1727938 A CN 1727938A CN 200410009377 CN200410009377 CN 200410009377 CN 200410009377 A CN200410009377 A CN 200410009377A CN 1727938 A CN1727938 A CN 1727938A
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- 230000003287 optical effect Effects 0.000 claims abstract description 20
- 238000005286 illumination Methods 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims description 3
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- 239000004973 liquid crystal related substance Substances 0.000 claims description 3
- 238000000265 homogenisation Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
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Abstract
The invention relates to a light beam homogenizing device in a laser projection television illuminating system, belonging to the technical field of laser display. The expanded laser beam is incident on a diffractive optical element for homogenization to form a uniform illumination area with a desired shape, and illuminates the light modulator. The invention can convert the expanded round or annular or oval laser beam into the square illumination beam, has high light energy utilization rate and good illumination uniformity on the light modulator of the illuminated area, and is suitable for a laser projection television system adopting laser as an illumination light source. In a laser projection television, red, green and blue tricolor lasers respectively pass through the light beam homogenizing device, are subjected to color combination by the color combination device, and are projected onto a screen through a projection objective, so that large-screen display of the lasers is realized.
Description
Technical field
The present invention relates to is beam uniformity device in a kind of laser projection tv illuminator, belongs to the laser display technology field.
Background technology
Present TV has defectives such as brightness is low, life-span weak point, narrow viewing angle.Characteristics such as the appearance of projection TV and development are display techniques in the important breakthrough in this century, and it has environmental protection, zero radiation, little, in light weight, the high resolving power of volume, and power consumption is little.Along with Digital Television, the establishment of high-definition television standard, projection TV has had application prospects and market more, finally can become desirable display terminal.LASER Light Source is other lighting sources relatively, and following advantage is arranged: chromatic triangle is big, has good monochromaticity and directivity, and laser display has true to nature, advantage such as saturation degree good, color representation power is abundant bright in luster.Laser is the best light source of Projection Display up to now, and the LASER Light Source life-span is long.Laser beam distribution of amplitudes function is a Gaussian function, and the amplitude of each point is unequal on its corrugated, so the homogenising of laser beam is a major issue that adopts laser must solve as the laser television light source.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, the beam uniformity device in a kind of laser projection tv illuminator is provided, to realize that illumination uniformity is good on the photomodulator.
Technical solution of the present invention is: the beam uniformity device in the laser projection tv illuminator, its characteristics are: it is formed by expanding Shu Yihou laser beam, diffraction optical element (DOE) and photomodulator, the laser beam that expands after restrainting has incided on the diffraction optical element of homogenising effect, form the even field of illumination of required form, the illumination light modulator.
It is square illuminating bundle that the present invention makes the circle that expands behind the bundle or annular or oval-shaped laser Beam Transformation, and efficiency of light energy utilization height, and illumination uniformity is good on the illuminated area light modulator.Be suitable for adopting the laser projection tv system of laser as lighting source.
Described diffraction optical element (DOE) is phase-type or amplitude type diffraction optical element, its can be produced on single or two transmission planes on, also can be produced on the single reflecting surface.
Described photomodulator is liquid crystal light modulator LCOS or LCD device, or digital micro-mirror DMD device, or other types can be used the photomodulator of laser lighting.
Description of drawings
Fig. 1 is a theory diagram of the present invention;
Fig. 2 is the laser beam distribution of amplitudes curve map behind the expansion bundle of the present invention;
Fig. 3 is a laser beam distribution of amplitudes curve map on the photomodulator of the present invention;
Fig. 4 expands the circular laser beam shape figure in bundle back for the present invention;
Fig. 5 is laser beam shape figure on the photomodulator of the present invention;
Fig. 6 expands bundle back oval-shaped laser beam shape figure for the present invention;
Fig. 7 expands bundle back annular laser beam shape figure for the present invention;
Fig. 8 is for using the present invention the synoptic diagram in the projection TV.
Embodiment
As shown in Figure 1, the present invention forms by expanding Shu Yihou laser beam, diffraction optical element (DOE) and photomodulator.Because the bore of the laser beam that laser instrument is exported is generally less, need to expand bundle, the beam size that expands after restrainting is external in diffraction optical element (DOE) clear aperture.Expand bundle back laser beam shape and generally be illustrated in figure 4 as circle, also may be illustrated in figure 6 as ellipse, be illustrated in figure 7 as annular, distribution of amplitudes is Gaussian distribution as shown in Figure 2.Laser beam behind the expansion bundle is through diffraction optical element (DOE) homogenising back lighting photomodulator, and the laser beam shape is illustrated in figure 5 as rectangle on the photomodulator at this moment, and distribution of amplitudes is illustrated in figure 3 as rectangle.This has just realized field of illumination and the photomodulator coupling in shape, thereby guarantees the high usage of luminous energy; Luminous energy on the photomodulator is evenly distributed simultaneously, thereby has reached the effect of even illumination.
Diffraction optical element can be produced on one or two transmission plane, also can be produced on the single reflecting surface.Diffraction optical element realizes that circular (Fig. 4) or oval (Fig. 6) or annular (Fig. 7) expand the conversion of light beams to square (Fig. 5) illuminating bundle, and is square because photomodulator is generally, thereby diffraction optical element can improve the efficiency of light energy utilization effectively.Diffraction optical element is phase-type or amplitude type diffraction optical element.
Photomodulator can be liquid crystal light modulator LCOS or LCD device, or digital micro-mirror DMD device, also can use the photomodulator of laser lighting for other types.Diffraction optical element can be realized telecentric beam path in image space, thereby has guaranteed the lighting quality on the photomodulator.
The laser projection tv synoptic diagram as shown in Figure 8.The laser beam 1, diffraction optical element 2, the photomodulator 3 that expand after restrainting are formed the laser projection tv illuminators.In laser projection tv, red, green, basket tricolor laser passes through the laser projection tv illuminator respectively, after ECDC look device closes look then, project on the screen 5 through projection objective 4 again, thus the large screen display of realization laser.
Claims (5)
1, the beam uniformity device in the laser projection tv illuminator, it is characterized in that: it is formed by expanding Shu Yihou laser beam, diffraction optical element and photomodulator, the laser beam that expands after restrainting has incided on the diffraction optical element of homogenising effect, form the even field of illumination of required form, the illumination light modulator.
2, the beam uniformity device in the laser projection tv illuminator according to claim 1 is characterized in that: described diffraction optical element is phase-type or amplitude type diffraction optical element.
3, the beam uniformity device in the laser projection tv illuminator according to claim 1 and 2 is characterized in that: described diffraction optical element can be produced on single or two transmission planes on, also can be produced on the single reflecting surface.
4, the beam uniformity device in the laser projection tv illuminator according to claim 1 is characterized in that: described expansion Shu Yihou laser beam is circular annular or oval incident laser light beam.
5, the beam uniformity device in the laser projection tv illuminator according to claim 1, it is characterized in that: described photomodulator is liquid crystal light modulator LCOS or LCD device, or digital micro-mirror DMD device, or other types can be used the photomodulator of laser lighting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410009377 CN1727938A (en) | 2004-07-28 | 2004-07-28 | Light beam homogenizing device in laser projection television illuminating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410009377 CN1727938A (en) | 2004-07-28 | 2004-07-28 | Light beam homogenizing device in laser projection television illuminating system |
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| Publication Number | Publication Date |
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| CN1727938A true CN1727938A (en) | 2006-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200410009377 Pending CN1727938A (en) | 2004-07-28 | 2004-07-28 | Light beam homogenizing device in laser projection television illuminating system |
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| CN (1) | CN1727938A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102103270A (en) * | 2011-03-27 | 2011-06-22 | 山东大学 | Laser beam light balancing and shaping and speckle eliminating integrated device |
| CN104965307A (en) * | 2015-07-28 | 2015-10-07 | 山东大学 | Device and method being capable of achieving light beam shaping dodging and speckle eliminating at the same time |
| CN108169981A (en) * | 2018-01-15 | 2018-06-15 | 深圳奥比中光科技有限公司 | Multi-functional lighting module |
| CN108227231A (en) * | 2018-01-15 | 2018-06-29 | 深圳奥比中光科技有限公司 | Fringe projection module |
| WO2020082975A1 (en) * | 2018-10-26 | 2020-04-30 | 深圳光峰科技股份有限公司 | Display apparatus and display system |
-
2004
- 2004-07-28 CN CN 200410009377 patent/CN1727938A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102103270A (en) * | 2011-03-27 | 2011-06-22 | 山东大学 | Laser beam light balancing and shaping and speckle eliminating integrated device |
| CN104965307A (en) * | 2015-07-28 | 2015-10-07 | 山东大学 | Device and method being capable of achieving light beam shaping dodging and speckle eliminating at the same time |
| CN108169981A (en) * | 2018-01-15 | 2018-06-15 | 深圳奥比中光科技有限公司 | Multi-functional lighting module |
| CN108227231A (en) * | 2018-01-15 | 2018-06-29 | 深圳奥比中光科技有限公司 | Fringe projection module |
| WO2020082975A1 (en) * | 2018-10-26 | 2020-04-30 | 深圳光峰科技股份有限公司 | Display apparatus and display system |
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