WO1999060440A1 - Projecteur a cristaux liquides - Google Patents
Projecteur a cristaux liquides Download PDFInfo
- Publication number
- WO1999060440A1 WO1999060440A1 PCT/JP1999/002657 JP9902657W WO9960440A1 WO 1999060440 A1 WO1999060440 A1 WO 1999060440A1 JP 9902657 W JP9902657 W JP 9902657W WO 9960440 A1 WO9960440 A1 WO 9960440A1
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- WO
- WIPO (PCT)
- Prior art keywords
- light
- beam splitter
- polarized
- region
- component
- Prior art date
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
- H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
- G03B21/006—Projectors using an electronic spatial light modulator but not peculiar thereto using LCD's
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3167—Modulator illumination systems for polarizing the light beam
Definitions
- the present invention relates to a liquid crystal projector device using a reflection type liquid crystal plate, and more particularly to a miniaturized one by reducing the number of components by using a narrow band polarizing beam splitter or a narrow band retardation plate. . Background art
- a conventional liquid crystal projector using a reflection type liquid crystal plate condenses white light from a light source 1 with lens arrays 2, 4 and a lens 5, and forms a dichroic mirror 7 as shown in FIG. 1 and 72 separate the light into three colors, red, green and blue, and use polarizing beam splitters (PBS) 74 R, 74 G and 74 B to s-polarize the light in each color area
- PBS polarizing beam splitters
- the components are separated from each other and incident on reflective liquid crystal panels 10 R, 10 G, and 10 B for the red, green, and blue regions, respectively, and each reflective liquid crystal panel 10 R, 10 G
- the cross dichroic prism 75 combines the p-polarized component image light of each color region that is modulated and reflected and output at 10 B, and is projected by the projection lens 12 on a screen.
- Such a conventional liquid crystal projector device not only requires a relatively expensive cross dichroic prism 75, but also reflects each light path after being separated into red, green, and blue color lights. Since the liquid crystal panels 10R, 10G and 1OB must be laid out so as not to interfere with each other, there is a problem that the volume of the housing becomes large.
- the present invention has been made in view of such a point, and reduces the number of dichroic mirrors by using a filter, and imparts color separation performance by using PBS having a narrow band characteristic, or
- An object of the present invention is to reduce the number of component parts and reduce the size of the device by using a one-to-two phase difference plate having a narrow band characteristic. Disclosure of the invention
- the liquid crystal projector device of the present invention includes a light source that outputs white light, a first dichroic mirror that reflects green region light from the light source and transmits red region light and blue region light, and a first dichroic mirror.
- the first PBS which reflects the s-polarized light component of the green light from the mirror, and the green light from the first PBS, which are modulated, reflected, transmitted through the first PBS, and output for the green light.
- Liquid crystal plate, a second PBS that reflects the s-polarized light components of the red and blue light components of the first dichroic mirror and transmits the p-polarized light component, and the s-polarized light component of the second PBS mirror is blue.
- a reflective liquid crystal panel for the blue region which enters through a region light transmitting filter, reflects, modulates and transmits through the second PBS, and the P-polarized component from the second PBS through the red region light transmitting filter.
- Red which is modulated, reflected, reflected by the second PBS, and output A region-type reflective liquid crystal plate; a first dichroic prism that transmits image light in the green region from the first PBS and reflects image light in the blue region and the red region of the second PBS; It comprises a projection lens that projects the image light from the dichroic prism onto the screen.
- a third PBS for separating the s-polarized light component of the green region light from the light source is provided, and the light from the third PBS is incident on the reflective liquid crystal panel for the green region, and is modulated and reflected to form the third PBS. It may be configured to output the light through.
- the fourth PBS transmits the s-polarized component of the blue region light and converts the s-polarized component of the red region light into a P-polarized component by rotating the plane of polarization by 90 °.
- the s-polarized light component (blue region light) reflected by the second PBS is directly incident on the reflective liquid crystal plate for the blue region via the 1.1 ⁇ 2 phase difference plate, and the p-polarized light is transmitted through the second PBS.
- the component (red region light) may be directly incident on the reflection liquid crystal panel for the red region, and the filter for the blue region light and the filter for the red region light may not be used.
- a fourth PBS for aligning light from the light source to the s-polarized light component is provided, so that light from the fourth PBS is incident on the first dichroic mirror, and light from the first dichroic mirror is transmitted to the first dichroic mirror.
- the light is incident on the second PBS via the phase difference plate, and the second PBS reflects the s-polarized component (blue region light) and transmits the P-polarized component (red region light).
- the s-polarized component of light is incident on the reflective liquid crystal panel for the blue region, modulated, reflected and transmitted through the second PBS, and the P-polarized component of the second PBS is red.
- the light may be incident on the area reflection type liquid crystal plate, modulated and reflected, reflected by the second PBS, and output.
- a second dichroic mirror for transmitting the green region light from the fourth PBS and reflecting the red region light and the blue region light is provided, and the green region light from the second dichroic mirror is transmitted to the first PBS. It may be configured such that the light enters the reflective liquid crystal plate for the green region through the light source, and the blue region light and the red region light enter the first / first Z2 retardation plate.
- a 2nd, 1st, 2nd wavelength plate that rotates the polarization plane by 90 ° for the light in the entire wavelength region is provided, and the p-polarized light component of the 2nd PBS filter is arranged.
- the same s-polarized light incident type as that for the blue and green regions can be used for the reflective liquid crystal plate for the red region.
- a fifth PBS for aligning and outputting the light from the light source to the P-polarized light component is provided, and a 11/2 phase difference plate is provided to convert the p-polarized light component of the red region light of the fifth PBS.
- the polarization plane is rotated 90 ° to convert it into s-polarized light, transmits the blue-polarized light and green-polarized light, and transmits the p-polarized light. Reflects the s-polarized component (red region light), transmits the P-polarized component (blue region light and green region light), and installs a second dichroic prism to remove the blue region light of the P-polarized component from the sixth PBS. Transmits and reflects the light in the green region.
- the s-polarized light component from the sixth PBS is incident on the reflective liquid crystal panel for the red region.
- the blue light from the second dichroic prism is reflected on the reflective liquid crystal plate for the blue region.
- the green light enters the reflective liquid crystal panel for the green region, and is modulated and reflected by the reflective liquid crystal plate for each color region. It may be configured to be projected on subscription Ichin at the 6 P B the projection lens via the S image light.
- the 2nd and 1Z 2 wavelength plates are arranged in front of the reflective liquid crystal panel for the red region, and the s-polarized light component of the sixth PBS is converted to P-polarized light, so that the reflection for the red region is achieved.
- the same P-polarized light incidence type as that for the blue and green regions can be used for the liquid crystal panel.
- FIG. 1 is a configuration diagram showing a main part of a conventional liquid crystal projector device.
- FIG. 2 is a configuration diagram showing a main part of the first embodiment of the present invention.
- FIG. 3 is a configuration diagram showing a main part of a second embodiment of the present invention.
- FIG. 4 is a characteristic diagram showing the reflectance of an s-wave by a polarizing beam splitter (PBS).
- PBS polarizing beam splitter
- FIG. 5 is a configuration diagram showing a main part of a third embodiment of the present invention.
- FIG. 6 is an explanatory diagram showing a fourth PBS.
- FIG. 7 is a characteristic diagram showing the rotation rate of the plane of polarization caused by the 1 2 phase difference plate.
- FIG. 8 is a configuration diagram showing a part of the fourth embodiment of the present invention.
- FIG. 9 is a configuration diagram showing a main part of a fifth embodiment of the present invention.
- FIG. 10 is a block diagram showing an example in which a 2 ⁇ 12 phase difference plate is interposed in front of the reflective liquid crystal panel for the red region, and (a) is applied to FIGS. 2 and 3. (B) shows a case where the present invention is applied to FIGS. 5, 8, and 9.
- FIG. 11 is a configuration diagram showing a main part of a sixth embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 2 shows a first embodiment of a liquid crystal projector according to the present invention, wherein 1 is a light source that emits white light using a metal halide lamp or the like, and 2 and 4 condense white light from the light source 1.
- a lens array, 3 is a total reflection mirror
- 5 is a condensing lens that further condenses the white light from the lens array 4
- 6 is a red light that reflects green region light out of the white light incident from the condensing lens 5.
- a first dichroic mirror that transmits light in the blue region.
- Fig. 4 (a) Each component has a broadband reflection characteristic as shown in Fig. 4 (a), which reflects the s-polarized component over the entire wavelength range (from red to blue) of the incident light and converts the P-polarized component.
- Reference numeral 9 denotes a red region light transmission filter that transmits the red region light of the light transmitted through the second to third 38
- 9B denotes a blue region light transmission filter that transmits the blue region light reflected by the second PBS.
- 10 G is a reflective liquid crystal plate that reflects light from the first PBS 7 to generate an image, and is used for an s-polarized light incident green region.
- 10 B reflects the light reflected by the second PBS 8 to generate an image.
- This is a reflective liquid crystal panel for the s-polarized light incidence type blue region.
- 10 R is a reflective liquid crystal plate that reflects light transmitted through the second PBS 8 to generate an image, and is used for a P-polarized light incident red region.
- Reference numeral 11 denotes a first dichroic prism that transmits green light and reflects blue light and red light
- 12 denotes a projection lens.
- the naturally polarized white light from the light source 1 is condensed by the two sets of lens arrays 2 and 4 and the condenser lens 5 sandwiching the total reflection mirror 3 and enters the first dichroic mirror 6 I do.
- the first dichroic mirror 6 reflects green region light and transmits blue region light and red region light.
- the green light enters the first PBS 7 and reflects only the s-polarized light component.Then enters the green reflective liquid crystal panel 10G and reflects the green light modulated by the green light signal. Output. Since this image light is P-polarized light, it passes through the first PBS 7 and passes through the first dichroic prism 11.
- this s-polarized light component only the blue region light transmitted through the blue region light transmission filter 9B is incident on the blue region reflective liquid crystal panel 10B, and reflects the blue region image light modulated by the blue region image signal. Output. Since this image light is P-polarized light, it passes through the second PBS 8 and is reflected by the first Dichroic prism 11.
- the p-polarized light component from the second PBS 8 only the red color region light transmitted through the red region light transmission filter 9R is incident on the red region reflection type LCD 1OR and modulated by the red region image signal.
- the reflected red image light is reflected and output. Since this image light is s-polarized light, it is reflected by the second PBS 8, reflected by the first dichroic prism 11, and projected in a risk-like manner by the projection lens 12 together with the image light in the green and blue regions. Is done.
- the liquid crystal projector device of the first embodiment can process the blue region light and the red region light with one optical path, so that one optical path is not required and the device can be downsized.
- dichroic prism can be used instead of the cross dichroic prism, and the cost can be reduced since only one dichroic mirror is required.
- FIG. 3 shows a second embodiment of the liquid crystal projector according to the present invention, wherein 21 and 23 are total reflection mirrors.
- 2 2 is the 3rd to 8th 3 and is narrow as shown in Fig. 4 (b). It has band characteristics and reflects the s-polarized light component of the green light of the white light from the condenser lens 5 and transmits the P-polarized light component of the entire band.
- the other configuration is the same as that of the first embodiment, and the description is omitted.
- the white light condensed by the two lens arrays 24 and the condensing lens 5 is reflected by the total reflection mirror 21 and is incident on the third PBS 22, and the green light s It reflects only the polarized light component, enters the reflective liquid crystal panel 10G for the green region, and reflects and outputs image light in the green region modulated by the green region image signal.
- This green image light (P-polarized light) passes through the third PBS 22 and passes through the first dichroic prism 11.
- Light other than the s-polarized light component of the green region light from the light source passes through the third PBS 22, is reflected by the total reflection mirror 23, and enters the second PBS 8. Subsequent operations are the same as in the first embodiment, and a description thereof will be omitted.
- the liquid crystal projector device of the second embodiment can use the light transmitted through the third PBS 22 for other colors by using the third PBS 22 having a narrow band characteristic. Since a mirror is not required, it is possible to reduce the size of the apparatus, thereby reducing costs.
- FIG. 5 shows a third embodiment of the liquid crystal projector according to the present invention.
- the white light from the light source 1 is converted to the s-polarized light component by the lens array 4 of the liquid crystal projector of the first embodiment (FIG. 2).
- Combine the 4th PBS 31 that is aligned and output insert the 1st, 1Z2 phase difference plate 32 between the dichroic mirror 6 and the 2nd PBS 8, and transmit the red region light transmission filter 9R and the blue region light.
- the transmission filter 9B is omitted.
- the 1-1-2 phase difference plate 32 has a narrow-band polarization plane rotation characteristic shown in FIG. 7 (b), and rotates the polarization plane of the red region light by 90 ° to change the s-polarized light component to p.
- the fourth PBS 31 is formed by laminating a small block 31 b of PBS formed in a parallelogram inclined at 45 ° and having the same surface width w and thickness d. Each of the small blocks 31b is provided with a 12 phase difference plate 31f on the output surface.
- each output light of the lens array 2 converges on the small block 3 1b where the 1 2 phase difference plate 3 1 ⁇ is not arranged, and The small block 3 1 b where 1 f is placed is placed so that light does not enter it. In this way, the light is aligned with the s-polarized light component and output.
- the incident light transmits the p-polarized light component and reflects the s-polarized light component on the inclined boundary surface of the small block 31b.
- the transmitted P-polarized light component is converted into a s-polarized light component by the 1Z2 retardation plate 31 f disposed on the output surface, and is output.
- the reflected s-polarized light component is reflected again at the boundary of the small block 31b and output.
- all light transmitted through the fourth PBS 31 is aligned with the s-polarized light component.
- the s-polarized light component output and reflected at the boundary surface is reflected again, and the polarization plane is changed to a P-polarized light component by the 1 Z 2 phase difference plate 31 1, and output.
- the polarization plane is changed to a P-polarized light component by the 1 Z 2 phase difference plate 31 1, and output.
- all the light transmitted through the fourth ⁇ S 31 is aligned with the ⁇ polarization component.
- the white light adjusted to the s-polarized light component by the fourth PBS 31 enters the dichroic mirror 6, reflects the green region light, and transmits the blue region light and the red region light.
- the reflected green region light (s-polarized light component) is incident on the first PBS 7 and is reflected, and is incident on the green region reflective liquid crystal panel 10G.
- the blue region light and the red region light transmitted through the dichroic mirror 6 are incident on the first 1/2 phase plate 32, the blue region light is transmitted as the s-polarized component, and the red region light is ⁇ -polarized light. It is converted into a component and enters the second PBS 8.
- the second PBS 8 reflects the s-polarized component (blue region light), enters the reflective liquid crystal panel for blue region 10B, transmits the P-polarized component (red region light), and reflects the red region reflective liquid crystal. It is incident on plate 10R. Since the s-polarized component is light in the blue region, a blue region light transmission filter is not required, and the P-polarized component is light in the red region, so a red region light transmission filter is unnecessary. The other operations are the same as those in the first embodiment, and a description thereof will be omitted.
- the utilization factor of the light source is increased, and the illuminance of the projected image is improved.
- FIG. 8 shows a fourth embodiment of the liquid crystal projector device according to the present invention.
- the lens array 4 of the liquid crystal projector device of the second embodiment (FIG. 3) has a fourth PBS 3 similar to the third embodiment.
- the first and second phase difference plates 32 similar to the embodiment are inserted, and the red light transmission filter 9R and the blue light transmission filter 9B are omitted.
- the other configuration is the same as that of the second embodiment, and the description is omitted.
- the white light from the light source 1 is incident on the fourth PBS 31 to be aligned with the s-polarized light component, is incident on the third PBS 22, reflects the s-polarized light component of the green light, and reflects the green light.
- the s-polarized light component of the light other than the green region transmitted through the third PBS 22 is incident on the first / first retardation plate 32. Subsequent operations are the same as in the third embodiment.
- FIG. 9 shows a fifth embodiment of the liquid crystal projector according to the present invention.
- the liquid crystal projector of the third embodiment (FIG. 5) transmits green light instead of the first dichroic mirror 6 of the liquid crystal projector.
- the second dichroic mirror 41 that reflects blue light and red light is used.
- the other configuration is the same as that of the third embodiment, and the description is omitted.
- the position of the light source 1 is opposite to that of the second embodiment (FIG. 3) or the fourth embodiment (FIG. 8, light source 1 is not shown), and the projection lens 12 can be arranged at the left end. it can. Further, since the distance from the light source 1 to each reflective liquid crystal plate becomes equal, a relay lens for correction is not required.
- FIG. 10 shows a case in which a 2 1 2 phase difference plate 51 is inserted in front of the reflective liquid crystal plate 1 OR 'for the red region, and this 1/2 phase difference plate is shown in FIG. ),
- the polarization plane rotates in the same way in the entire region from blue to red (P-polarized light component ⁇ s-polarized light component, or vice versa). Since the p-polarized light component from the second PBS 8 is converted into the s-polarized light component by interpolation, the s-polarized light incident type reflection type liquid crystal panel 10 R ′ for the red region can be used, and other colors can be used.
- the first 0 shows a case of applying the second view Contact Yopi Figure 3
- the first 0 view (b) is The case where it is applied to Fig. 5, Fig. 8 and Fig. 9 is shown.
- FIG. 11 shows a sixth embodiment of the liquid crystal projector according to the present invention.
- 6 1 is the fifth PBS that aligns the white light from the light source 1 with the P-polarized component
- 6 2 is the total reflection mirror
- 6 3 is the sixth PBS that reflects the s-polarized component and transmits the P-polarized component
- 6 4 is the A second dichroic prism 65 that transmits blue region light and reflects green region light is a glass prism for adjusting the back focus position from the projection lens 12 to another color.
- the white light from the light source 1 is aligned with the P-polarized light component by the fifth PBS 61, and is incident on the first and second retardation films 32 through the total reflection mirror 62, and the light in the red region is emitted.
- the polarization plane is rotated by 90 ° to convert it into s-polarized light, and the other color regions are transmitted through the p-polarized light without rotating the polarization plane.
- the light from the first and first Z 2 phase difference plates 32 is incident on the sixth PBS 63, and the s-polarized light component (red region light) is reflected and reflected by the glass prism 65 to the reflective liquid crystal for the red region.
- the light enters the plate 10 R ′, and the P-polarized light component (blue region light and green region light) is transmitted and enters the second dichroic prism 64.
- the second dichroic prism 64 transmits the blue region light and enters the blue region reflection type liquid crystal panel 10B.
- the green region light is reflected by the second dichroic prism 64 and reflects the green region reflection type liquid crystal plate. Incident at 1 OR. Modulated by each reflective liquid crystal panel 1 OR ', 10 B, 100-The reflected image light of each color area is recombined by the second dichroic prism 64 and the sixth PBS 63 to form a projection lens It is projected at risk screen by 1 2.
- the reflective liquid crystal panel 10 R ′ for the red color region is of the s-polarized light input type.
- the same P-polarized light input type as the one used in the present invention may be used.
- the present invention can be implemented by replacing each reflective liquid crystal plate for the red region, the green region, and the blue region with each other.
- the dichroic mirror, dichroic prism, filter, narrow-band PBS or narrow-band 12 phase difference plate should be replaced with one having appropriate characteristics according to the arrangement of the reflective liquid crystal plates of each color.
- the present invention uses a filter or a PBS having a narrow band characteristic to perform color separation.
- the number of dichroic mirrors is reduced by providing separation performance, or the number of PBSs is reduced by using a 12-2 phase difference plate with narrow band characteristics. It can be used for a liquid crystal projector with reduced size and reduced cost.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Projection Apparatus (AREA)
- Liquid Crystal (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Transforming Electric Information Into Light Information (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/463,531 US6343864B1 (en) | 1998-05-20 | 1999-05-20 | Liquid crystal projector equipment |
CA002297688A CA2297688C (en) | 1998-05-20 | 1999-05-20 | Liquid crystal projector |
EP99921203A EP1008895A4 (en) | 1998-05-20 | 1999-05-20 | LIQUID CRYSTAL PROJECTOR |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10/138149 | 1998-05-20 | ||
JP13814998A JP3622500B2 (ja) | 1998-05-20 | 1998-05-20 | 液晶プロジェクタ装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999060440A1 true WO1999060440A1 (fr) | 1999-11-25 |
Family
ID=15215167
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/002657 WO1999060440A1 (fr) | 1998-05-20 | 1999-05-20 | Projecteur a cristaux liquides |
Country Status (5)
Country | Link |
---|---|
US (1) | US6343864B1 (ja) |
EP (1) | EP1008895A4 (ja) |
JP (1) | JP3622500B2 (ja) |
CA (1) | CA2297688C (ja) |
WO (1) | WO1999060440A1 (ja) |
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- 1999-05-20 CA CA002297688A patent/CA2297688C/en not_active Expired - Fee Related
- 1999-05-20 US US09/463,531 patent/US6343864B1/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
CA2297688A1 (en) | 1999-11-25 |
JP3622500B2 (ja) | 2005-02-23 |
US6343864B1 (en) | 2002-02-05 |
EP1008895A1 (en) | 2000-06-14 |
JPH11326861A (ja) | 1999-11-26 |
CA2297688C (en) | 2007-01-09 |
EP1008895A4 (en) | 2005-12-07 |
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