CN2679718Y - Reflecting optical engine for LED projector - Google Patents
Reflecting optical engine for LED projector Download PDFInfo
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- CN2679718Y CN2679718Y CN 03208860 CN03208860U CN2679718Y CN 2679718 Y CN2679718 Y CN 2679718Y CN 03208860 CN03208860 CN 03208860 CN 03208860 U CN03208860 U CN 03208860U CN 2679718 Y CN2679718 Y CN 2679718Y
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Abstract
The utility model discloses a reflecting optical engine for LED projector, comprising a light source, an LCD light modulator and a projection objective system. A light emitted from the light source penetrates a red light through bidirectional color splitting mirrors and reflects a blue green light, the red light penetrated by the bidirectional color splitting mirrors enters a red light polarized light splitting prism and then enters a polarizing color mixing prism after passing through a compensator, a liquid crystal device and a half-wave sheet, the blue green light reflected by the first bidirectional color splitting mirror penetrates a blue light and reflects a green light through the second bidirectional color splitting mirror, and the penetrated blue light enters a blue light polarized light splitting prism and then enters the other side of the polarizing color mixing prism after passing through the compensator, the liquid crystal device and the half-wave sheet, the green light reflected by the second bidirectional color splitting mirror enters a green light polarized light splitting prism and then enters the third side of the polarizing color mixing prism after passing through the compensator and the liquid crystal device, then the reflecting optical engine proceeds polarizing light mixing color, and a color image is projected through the four side of the polarizing color mixing prism after being composed. The system has simple structure of the polarization field, short light length, high contrast grade, good ash field uniformity, high light efficiency, low cost and good matching property.
Description
Technical field
The utility model relates to a kind of light engine, the light engine that particularly uses in liquid crystal projection apparatus.
Background technology
Light engine can be used for liquid crystal and digital-code projector, liquid crystal and digital rear-projection TV, and is their core component.Along with the expansion day by day in projector and rear-projection TV market, light engine has very considerable prospect.
According to incompletely statistics, projector's sales volume of China in 1997 is 8000, and 1998 annual turnovers then are near 20,000.2000 annual turnovers reach 6～70,000 and reached 120,000 in 2002.The average year increment rate surpasses 20%.
Light engine is on speaking terms than colored picture tube and colour TV with complete machine.It is the core component of the projection display, it greatly about and determined the indexs such as brightness, sharpness, contrast, brightness uniformity, excitation, distortion, cost, life-span of complete machine.Low-coat scale production light engine is the condition precedent that realizes the projection products industrialization.
Optical engine lighting system at home and abroad adopts fly's-eye lens to add the structure of polarisation converter (PBC) in general at present, realizes the even requirement of throwing light on and natural light being converted to polarized light.The advantage of this structure is the efficient height, and shortcoming is the cost height.The another kind of structure of illuminator is to adopt integrator to add the WG type polarizer.Its advantage is simple in structure, and cost is lower.Shortcoming is that efficient is low, and about 50% luminous energy is wasted.
And, in existing optical engine system, in the ColorQuad system, optical length, and glue interface is many.Because prism material can cause temperature rise to the absorption of light, and then near glue interface, produce stress in working order down,, birefringence effect can change the polarization state of light beam, make linearly polarized light become elliptically polarized light, make bias light on the direction of analyzer, produce component, cause contrast to descend.Light path in the polarization field is longer, and the optical path difference (phase differential) of O light and E light is just bigger, and decrease of contrast is just more serious.
The utility model content
At this situation, the purpose of this utility model provides a kind of have high brightness, high definition, high-contrast, efficiency of light energy utilization height, polarization field light engine simple in structure.
The utility model is used for the reflective optic engine of liquid crystal projection apparatus, comprises light source, liquid crystal light modulator, projection objective system, and wherein the light from light emitted sees through ruddiness through the one or two to dichronic mirror, the reflection blue green light; Describedly entered the ruddiness polarization splitting prism,, enter the polarization color-combination prism behind liquid crystal device and the half-wave plate again through compensator by the one or two ruddiness that sees through to dichronic mirror; Pass through the two or two to dichronic mirror by the one or two blue green light to the dichronic mirror reflection, see through the blu-ray reflection green glow, the blue light that is seen through enters the blue light polarization splitting prism, again through compensator, and the one side relative that enters the polarization color-combination prism behind liquid crystal device and the half-wave plate with ruddiness; Enter the green glow polarization splitting prism by the two or two green glow,, enter the 3rd of polarization color-combination prism behind the liquid crystal device again through compensator to the dichronic mirror reflection; Carry out the look that closes of polarized light, the coloured image after synthesizing is by closing the fourth face projection of look mirror.
The utility model is used for the reflective optic engine of liquid crystal projection apparatus, wherein light source also comprises ultrahigh pressure mercury lamp and elliposoidal reflector, and integration chamber, non-spherical lens group, polarizing beam splitter be set according to this in its light path, catoptron, described integration chamber is located at the second focus place of elliposoidal reflector, and described catoptron is arranged on the reflected light path of polarizing beam splitter, and some lens are set respectively on the light path of polarizing beam splitter and catoptron, constitute two unit fly's-eye lenses
The utility model is used for the reflective optic engine of liquid crystal projection apparatus, and wherein the polarizing beam splitter in the light source is the wire grid type polarizing beam splitter.
The utility model is used for the reflective optic engine of liquid crystal projection apparatus, and wherein the exit end in the polarizing beam splitter light path is provided with half-wave plate, to change the polarization direction of polarized light.
The utility model is used for the reflective optic engine of liquid crystal projection apparatus, the equivalent optical path of three illumination paths of wherein said red, green, blue.
The reflective optic engine advantage that the utility model is used for liquid crystal projection apparatus is: at native system, polarization field is simple in structure, and light path only is 2 times of polarization splitting prism length.As a comparison, in the ColorQuad system, light path but is 4 times of single PBS length, and glue interface is more.Because the light absorption meeting of prism material causes temperature rise, and then near glue interface, produce stress in working order down,, birefringence effect can change the polarization state of light beam, make linearly polarized light become elliptically polarized light, make bias light on the direction of analyzer, produce component, cause contrast to descend.Light path in the polarization field is longer, and the optical path difference (phase differential) of O light and E light is just bigger, and decrease of contrast is just more serious.Our experiment shows, compares with the ColorQuad system, and the contrast of native system will exceed more than 20%, and grey field uniformity is also better.For closing look imaging system system, the optical efficiency of native system exceeds more than 25%.The colorimetric properties of native system are controlled to dichronic mirror 12,21 by two two, the easier desired value that obtains.Native system is being selected suitable camera lens for use, adjusts two after the color separation parameter of dichronic mirror, can be applicable to rear-projection machine and just congenial respectively, scope of application broad.Cost is low, and matching is good.
The utility model is used for other details of reflective optic engine of liquid crystal projection apparatus and characteristics can be cheer and bright by reading the embodiment that hereinafter encyclopaedizes in conjunction with the accompanying drawings.
Description of drawings
Fig. 1 is the synoptic diagram that the utility model is used for the reflective optic engine of liquid crystal projection apparatus.
Embodiment
Fig. 1 is the synoptic diagram that the utility model is used for the reflective optic engine of liquid crystal projection apparatus, wherein light source assembly 1 is made up of ultrahigh pressure mercury lamp 1a (UHP) and ellipsoid reflector 1b, and reflector 1b inside surface is coated with cold reflective membrane, reflect visible light, the transmission infrared radiation is with the temperature rise of control optical element.The light beam that the ellipsoid reflecting surface sends light source 1a focuses on the second focus place, is provided with integration chamber 2 at this, and light beam enters in the integration chamber 2, and the exit end in integration chamber 2 forms uniform light distribution.Non-spherical lens group 3 is with beam collimation, and 4 is wire grid type polarizing beam splitter (WG), and transmission P polarized light reflects the S polarized light simultaneously.The heat resistance of wire grid type polarizing beam splitter is good, the more important thing is that angular characteristics is insensitive, is applicable to the system of less F number, helps improving the efficiency of light energy utilization.5 is catoptron, adjusts the S direction of light.Lens 6 and 9, lens 7 and 10 constitute the fly's-eye lens of Unit two respectively, and lens 6 and 9 constitute the entrance pupil of illuminator.8 is half-wave plate, changes the P polarized light into the S polarized light.So far, realized beam uniformity and the natural light that light source sends is changed into the purpose of the polarized light of same polarization state.Lens 11,14,22,27 are relay lens group, entrance pupil are imaged in the surface of three liquid crystal devices that form on silicon (LCOS) 18,26,31 respectively.12 be first gradient two to dichronic mirror, transmit red light, blue, the green glow of reflection.13 is red mirror, adjusts the direction of light beam and further reduces infrared radiation.19,20 is catoptron, 21 be second gradient two to dichronic mirror, transmit blue, reflect green light.16,24,29 be respectively red, green, blue (RGB) polarisation of light Amici prism (PBS), described polarization splitting prism (PBS) 16,24,29 enters compensator 17 with the S polarized light reflection of the red, green, blue of incident respectively, 25,30 and liquid crystal device (LCOS) 18,26,31, transmission makes it to enter polarization color-combination prism (X-Cube) 38 through the P polarized light of LCOS18,26,31 modulation.The polarizer of rgb light is respectively 15,23,28, carries out polarization state and purifies.32,34,35 analyzers that are respectively rgb light pass through flashlight, and bias light is attenuated.In fact, if the characteristic enough good (Ts enough little) of polarization splitting prism 16,24,29 under in working order, above-mentioned three analyzers just might save, and this will be determined by later experiment.Half-wave plate 33,36 changes the RB light of P polarization state into S light respectively, thereby makes X-Cube reflect the RB light of S polarization state respectively, and the G light of transmission P polarization state is in favourable duty.The equivalent optical path of three illumination paths of the described red, green, blue of total system.Like this, the rgb signal light that reflects respectively from LCOS18,26,31 is incident upon on the screen by projection objective 38 after X-Cube closes look, finishes the synthetic of coloured image.
Claims (5)
1. light engine that is used for liquid crystal projection apparatus, comprise light source, liquid crystal light modulator, projection objective system, it is characterized in that described light engine comprises successively according to light path: light source (1), liquid crystal light modulator, projection objective system, liquid crystal light modulator comprises the one or two to dichronic mirror (12), red mirror (13), catoptron (19,20), second gradient two to dichronic mirror (21) and respectively with the one or two to dichronic mirror (12), red mirror (13), second gradient two is to the corresponding green glow polarization splitting prism (24) of dichronic mirror (21), ruddiness polarization splitting prism (16), blue light polarization splitting prism (29), at described green glow polarization splitting prism (24), ruddiness polarization splitting prism (16), be polarization color-combination prism (37) between the blue light polarization splitting prism (29), the another side of polarization color-combination prism (37) is a projection surface.
2. light engine according to claim 1, it is characterized in that light source also comprises ultrahigh pressure mercury lamp and elliposoidal reflector, and integration chamber, non-spherical lens group, polarizing beam splitter be set according to this in its light path, catoptron, described integration chamber is located at the second focus place of elliposoidal reflector, and described catoptron is arranged on the reflected light path of polarizing beam splitter, and some lens are set respectively on the light path of polarizing beam splitter and catoptron, constitute two unit fly's-eye lenses
3. light engine according to claim 1 and 2 is characterized in that the polarizing beam splitter in the light source is the wire grid type polarizing beam splitter.
4. light engine according to claim 3 is characterized in that being provided with half-wave plate at the exit end of polarizing beam splitter light path, to change the polarization direction of polarized light.
5. light engine according to claim 4 is characterized in that equivalent optical paths red, green, three illumination paths of orchid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03208860 CN2679718Y (en) | 2003-09-02 | 2003-09-02 | Reflecting optical engine for LED projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03208860 CN2679718Y (en) | 2003-09-02 | 2003-09-02 | Reflecting optical engine for LED projector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2679718Y true CN2679718Y (en) | 2005-02-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03208860 Expired - Fee Related CN2679718Y (en) | 2003-09-02 | 2003-09-02 | Reflecting optical engine for LED projector |
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| Country | Link |
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| CN (1) | CN2679718Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105278224A (en) * | 2014-05-30 | 2016-01-27 | 深圳市绎立锐光科技开发有限公司 | Light-emitting device, projection display system and three-dimensional projection method |
| CN105789414A (en) * | 2015-01-14 | 2016-07-20 | Lg伊诺特有限公司 | Light emitting apparatus |
| CN117705003A (en) * | 2023-12-12 | 2024-03-15 | 湖北久之洋红外系统股份有限公司 | Digital fringe projector optical system |
-
2003
- 2003-09-02 CN CN 03208860 patent/CN2679718Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105278224A (en) * | 2014-05-30 | 2016-01-27 | 深圳市绎立锐光科技开发有限公司 | Light-emitting device, projection display system and three-dimensional projection method |
| CN105278224B (en) * | 2014-05-30 | 2019-03-29 | 深圳光峰科技股份有限公司 | Light emitting device, projection display system and tripleplane's method |
| CN105789414A (en) * | 2015-01-14 | 2016-07-20 | Lg伊诺特有限公司 | Light emitting apparatus |
| CN105789414B (en) * | 2015-01-14 | 2019-08-02 | Lg伊诺特有限公司 | Light emitting device |
| CN117705003A (en) * | 2023-12-12 | 2024-03-15 | 湖北久之洋红外系统股份有限公司 | Digital fringe projector optical system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |