WO2013014794A1 - 液晶プロジェクタ - Google Patents
液晶プロジェクタ Download PDFInfo
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- WO2013014794A1 WO2013014794A1 PCT/JP2011/067325 JP2011067325W WO2013014794A1 WO 2013014794 A1 WO2013014794 A1 WO 2013014794A1 JP 2011067325 W JP2011067325 W JP 2011067325W WO 2013014794 A1 WO2013014794 A1 WO 2013014794A1
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- WIPO (PCT)
- Prior art keywords
- liquid crystal
- light
- light source
- green
- crystal panel
- Prior art date
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1313—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells specially adapted for a particular application
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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
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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
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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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
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2073—Polarisers in the lamp house
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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
- G03B33/00—Colour photography, other than mere exposure or projection of a colour film
- G03B33/10—Simultaneous recording or projection
- G03B33/12—Simultaneous recording or projection using beam-splitting or beam-combining systems, e.g. dichroic mirrors
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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]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3164—Modulator illumination systems using multiple light sources
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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]
- H04N9/3141—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, and more particularly to a three-plate liquid crystal projector provided with a solid light source such as an LED (Light Emitted Device).
- a solid light source such as an LED (Light Emitted Device).
- Solid-state light sources such as LEDs have advantages such as good color purity of emitted color, small size, and excellent lifetime characteristics compared to high-pressure mercury lamps.
- a plate-type projector is provided.
- a three-plate type liquid crystal projector provided with three light sources of a red LED, a green LED, and a blue LED is known.
- red light emitted from the red LED is irradiated to the red liquid crystal panel unit
- green light emitted from the green LED is irradiated to the green liquid crystal panel unit, and from the blue LED.
- the emitted blue light is applied to the blue liquid crystal panel.
- the red, green, and blue light beams transmitted through the liquid crystal panel units are combined by the color combining unit, and the light beams of the respective colors combined by the color combining unit are projected onto the screen by the projection lens.
- the luminous flux represents the brightness of all the light emitted in a certain direction from the light source, and its unit is lumen (lm).
- a large luminous flux is synonymous with a large amount of light.
- a light source having a large emission luminous flux can be realized by using an LED having a large light emission area or an LED arranged in an array.
- how much light from a light source can be used as projection light in a projector depends on the light source side Etendue defined by the product of the light emitting area and the divergence angle, the area of the liquid crystal panel, and the projection lens. It is determined by the relationship with the imaging side etendue defined by the product of the capture angle (solid angle) determined by the F number. That is, in the projector, the light from the light source cannot be efficiently used as the projection light unless the value of the etendue on the light source side is equal to or less than the value of the etendue on the imaging side.
- the etendue value on the light source side is the same as the etendue value on the imaging side. If it exceeds the brightness, the brightness of the projected image cannot be improved. Due to this etendue limitation, the present situation is that a projection image with sufficient brightness cannot be obtained only by increasing the luminous flux of the light source.
- a liquid crystal panel unit in a liquid crystal projector, includes a liquid crystal panel and two polarizing plates respectively disposed on the incident surface side and the output surface side of the liquid crystal panel.
- the light transmitted through the polarizing plate on the incident surface side becomes linearly polarized light and enters the liquid crystal panel.
- the incident light of linearly polarized light changes its polarization state according to the refractive index anisotropy (birefringence) of the liquid crystal while propagating through the liquid crystal layer of the liquid crystal panel in the thickness direction.
- the output side polarizer transmits only polarized light in a specific direction out of the outgoing light that has passed through the liquid crystal layer.
- the light of each color emitted from the red LED, green LED, and blue LED is all non-polarized light. Therefore, if the light emitted from each LED is directly incident on the liquid crystal panel unit. A light loss of about 50% occurs in the liquid crystal panel portion.
- a polarization conversion element composed of first and second prisms is provided in the optical path of each color of light emitted from each of the red LED, green LED, and blue LED to reduce the loss caused by each liquid crystal panel unit.
- a method (second approach) for increasing the utilization efficiency is considered.
- Each of the first and second prisms is a rectangular parallelepiped prism in which two right-angle prisms are bonded.
- a polarization separation film that transmits P-polarized light and reflects S-polarized light is formed on the bonded surface of two right-angle prisms, and the light output from the LED is applied to the polarization separation film.
- the incident angle is approximately 45 degrees.
- the surface located in the traveling direction of the P-polarized light that has passed through the polarization separation film is the exit surface, and P-polarized light is emitted from the exit surface.
- a reflection film is formed on the surface where two right-angle prisms are bonded, and S-polarized light reflected by the polarization separation film of the first prism is incident on the reflection film at approximately 45 degrees. It is configured to enter at an angle.
- the surface located in the traveling direction of the light reflected by the reflective film is the exit surface, and a retardation plate for converting S-polarized light into P-polarized light is provided on the exit surface.
- the P-polarized light emitted from the first prism and the P-polarized light emitted from the second prism travel in the same direction.
- the area of the exit surface (first and second exit surfaces) of the polarization conversion element is approximately twice the light emission area of the LED. For this reason, the etendue value on the light source side exceeds the etendue value on the imaging side, and as a result, the light that is not used as the projection light increases and the light use efficiency decreases. Thus, due to etendue restrictions, even if a polarization conversion element is used, the light utilization efficiency cannot be increased so much and a projection image with sufficient brightness cannot be obtained.
- the three-plate projector described in Patent Document 1 includes first and second green LEDs, red LEDs, and blue LEDs having different peak wavelengths.
- the optical axis of the first green LED is orthogonal to the optical axis of the second green LED, and the dichroic mirror is provided at a position where the optical axes of the first and second green LEDs intersect.
- the green light beam output from the first green LED is reflected by the dichroic mirror, and the reflected light is applied to the green liquid crystal panel.
- the green light beam output from the second green LED is transmitted through the dichroic mirror, and the transmitted light is applied to the green liquid crystal panel.
- the red light beam output from the red LED is applied to the red liquid crystal panel.
- the blue light beam output from the blue LED is applied to the blue liquid crystal panel.
- the red image light from the red liquid crystal panel, the green image light from the green liquid crystal panel, and the blue image light from the blue liquid crystal panel are combined by a cross dichroic prism.
- the image light synthesized by the cross dichroic prism is projected on the screen by the projection lens.
- the first green light beam output from the first green LED and the second green light beam output from the second green LED pass through the dichroic mirror.
- the green liquid crystal panel is irradiated through the same optical path. According to this configuration, since the value of the etendue on the light source side does not increase, most of the first and second green light beams output from the first and second green LEDs can be used as projection light. . Also, most of the red and blue light beams output from the red LED and blue LED can be used as projection light.
- the problem of light loss in the liquid crystal panel can be solved by using a polarization conversion element, but a projection image with sufficient brightness cannot be obtained due to etendue restrictions. is the current situation.
- red LED, green LED and blue LED are different, and the maximum output value of red LED and green LED is smaller than that of blue LED.
- the brightness of the projected image is the highest.
- the color mixture ratio of light (red, green, blue) from each color LED driven at the maximum output is different from the predetermined color mixture ratio for obtaining the optimum white balance, the projected image has an unnatural color. And the image quality deteriorates. For this reason, normally, the optimum white balance is obtained by restricting the output of the red LED and the blue LED based on the maximum output value of the green LED.
- An object of the present invention is to solve the problem of etendue limitation, reduce the light loss of the liquid crystal panel part and increase the luminous flux, at least for a green light source, and has a high light utilization efficiency and a small liquid crystal. It is to provide a projector.
- the liquid crystal projector of the present invention is First to third liquid crystal panel units each of which spatially modulates incident light to display an image;
- a first illumination unit including a red light source that outputs red light having a peak wavelength in a red wavelength band, and wherein the first liquid crystal panel unit is irradiated with the red light output from the red light source;
- a green light source that outputs green light having a peak wavelength in a green wavelength band and a blue light source that outputs blue light having a peak wavelength in a blue wavelength band, and vibrates the green light output from the green light source
- the first and second linearly polarized light whose directions are orthogonal to each other are separated, and the first linearly polarized light is irradiated to the second liquid crystal panel unit, and the second linearly polarized light and the blue light source output from the blue light source
- a second illumination unit that irradiates the third liquid crystal panel unit with blue light
- a polarization color combining unit that combines the images displayed on the first to third liquid
- Another liquid crystal projector of the present invention is A red light source that outputs red light having a peak wavelength in the red wavelength band; A green light source that outputs green light having a peak wavelength in the green wavelength band; A blue light source that outputs blue light having a peak wavelength in a blue wavelength band; A first polarization separation unit that separates the red light output from the red light source into first and second linearly polarized light whose vibration directions are orthogonal to each other; A second polarization separation unit that separates the green light output from the green light source into the first and second linearly polarized light; A first color synthesizing unit that uses the first linearly polarized red light and the first linearly polarized green light as incident light, and emits the incident red and green light in the same optical path; A second color synthesizing unit that uses the second linearly polarized green light and the blue light emitted from the blue light source as incident light, and emits the incident green and blue light in the same optical path; A first liquid crystal panel that spatially modulates the second linear
- FIG. 1 is a schematic diagram illustrating a configuration of a liquid crystal projector according to a first embodiment of the present invention. It is a schematic diagram which shows the structure of the cross dichroic mirror of the liquid-crystal projector shown in FIG.
- FIG. 3 is a characteristic diagram showing spectral transmission characteristics of one dichroic film of the cross dichroic mirror shown in FIG. 2 with respect to P-polarized light and S-polarized light.
- FIG. 3 is a characteristic diagram showing spectral transmission characteristics with respect to P-polarized light and S-polarized light of the other dichroic film of the cross dichroic mirror shown in FIG. 2. It is a block diagram which shows the structure of the control system of the liquid crystal projector shown in FIG.
- FIG. 3 is a timing chart for explaining lighting operation of each light source and display operation of each liquid crystal panel section of the liquid crystal projector shown in FIG. 1. It is a schematic diagram which shows the structure of the liquid crystal projector which is the 2nd Embodiment of this invention. It is a schematic diagram which shows the structure of the cross dichroic mirror of the liquid-crystal projector shown in FIG. It is a timing chart for demonstrating lighting operation of each light source of the liquid crystal projector shown in FIG. 7, and display operation of each liquid crystal panel part. It is a schematic diagram which shows the structure of the liquid-crystal projector of other embodiment of this invention. It is a schematic diagram which shows the fluorescent substance wheel of the green light source of the liquid crystal projector shown in FIG. It is a schematic diagram which shows the whole structure of the green light source of the liquid crystal projector shown in FIG.
- FIG. 1 is a schematic diagram showing a configuration of a liquid crystal projector according to a first embodiment of the present invention.
- the liquid crystal projector of the present embodiment includes three light sources: a green light source 101G, a red light source 101R, and a blue light source 101B.
- the green light source 101G is a solid-state light source having a peak wavelength in the green wavelength band, and includes, for example, an LED or a semiconductor laser whose emission color is green.
- the red light source 101R is a solid-state light source having a peak wavelength in the red wavelength band, and includes, for example, an LED or a semiconductor laser whose emission color is red.
- the blue light source 101B is a solid-state light source having a peak wavelength in the blue wavelength band, and includes, for example, an LED or a semiconductor laser whose emission color is blue.
- the peak wavelength varies about ⁇ 10 to 20 nm as a manufacturing problem. Therefore, the peak wavelength is substantially the same as long as it is within the range of manufacturing variations.
- the light emission areas of the green light source 101G, the red light source 101R, and the blue light source 101B are the maximum areas within the area range that satisfies the etendue constraints.
- a lens 102 and a polarizing beam splitter 121 are arranged in the traveling direction of green light (unpolarized light) emitted from the green light source 101G. Green light from the green light source 101 ⁇ / b> G enters the polarization beam splitter 121 through the lens 102.
- the polarization beam splitter 121 separates incident light into first and second linearly polarized light that vibrate in a direction perpendicular to each other.
- first linearly polarized light is S-polarized light
- second linearly polarized light is P-polarized light
- the polarization beam splitter 121 has a polarization separation characteristic that reflects S-polarized light and transmits P-polarized light.
- Lenses 105 and 106 and a reflection mirror 127 are arranged in the traveling direction of the green S-polarized light reflected by the polarization beam splitter 121.
- the green S-polarized light from the polarization beam splitter 121 passes through the lenses 105 and 106 in order, and then is reflected by the reflection mirror 127 at an angle of approximately 90 °.
- the reflection mirror 127 may be a mirror having any reflection characteristic as long as it can reflect green light.
- the reflection mirror 127 may be an aluminum-deposited mirror, or a dichroic mirror made of a dielectric multilayer film that reflects green light and transmits or absorbs light of other colors. .
- the lens 115 and the liquid crystal panel 118 are arranged in the traveling direction of the green S-polarized light from the reflection mirror 127.
- the green S-polarized light from the reflection mirror 127 is applied to the liquid crystal panel unit 118 through the lens 115.
- the liquid crystal panel unit 118 is obtained by sandwiching a liquid crystal panel between two polarizing plates.
- the light transmitted through the polarizing plate on the incident surface side becomes linearly polarized light and enters the liquid crystal panel.
- the incident light of linearly polarized light changes its polarization state according to the refractive index anisotropy (birefringence) of the liquid crystal while propagating through the liquid crystal layer of the liquid crystal panel in the thickness direction.
- the output side polarizer transmits only polarized light in a specific direction out of the outgoing light that has passed through the liquid crystal layer.
- the green S-polarized light is applied to the liquid crystal panel unit 118, the green P-polarized light is emitted from the liquid crystal panel unit 118.
- the lenses 103, 113, 114, the dichroic mirror 124, the lens 117, and the liquid crystal panel unit 120 are arranged in the traveling direction of the blue light (unpolarized light) emitted from the blue light source 101B.
- Blue light emitted from the blue light source 101B passes through the lenses 103, 113, and 114 in order, and then enters the dichroic mirror 124.
- the dichroic mirror 124 is disposed at a position where the optical path of the blue light from the blue light source 101B intersects (or is orthogonal to) the optical path of the green P-polarized light transmitted through the polarization beam splitter 121.
- the dichroic mirror 124 has a characteristic of reflecting green light and transmitting blue light.
- Blue light from the blue light source 101B passes through the dichroic mirror 124, and green P-polarized light from the polarization beam splitter 121 is reflected by the dichroic mirror 124 at an angle of approximately 90 °.
- the blue light transmitted through the dichroic mirror 124 and the green P-polarized light reflected by the dichroic mirror 124 are applied to the liquid crystal panel unit 120 via the lens 117 along the same optical path.
- the liquid crystal panel unit 120 has a structure in which a liquid crystal panel is sandwiched between two polarizers, similar to the liquid crystal panel unit 118, but is configured to emit S-polarized light. Specifically, when blue light (unpolarized light) is emitted from the blue light source 101B to the liquid crystal panel unit 120, the liquid crystal panel unit 120 emits blue S-polarized light. When the green P-polarized light from the green light source 101G is applied to the liquid crystal panel unit 120, the liquid crystal panel unit 120 emits green S-polarized light.
- Lenses 111, 112, 116 and a liquid crystal panel unit 119 are arranged in the traveling direction of red light (unpolarized light) emitted from the red light source 101R.
- the red light emitted from the red light source 101R passes through the lenses 111, 112, and 116 in order, and then irradiates the liquid crystal panel unit 119.
- the liquid crystal panel unit 119 has a structure in which the liquid crystal panel is sandwiched between two polarizers, but is configured to emit S-polarized light.
- the red light unpolarized light
- the liquid crystal panel unit 119 emits red S-polarized light.
- the liquid crystal panel unit 119 is disposed so as to face the liquid crystal panel unit 120.
- the optical path of green P-polarized light emitted from the liquid crystal panel unit 118 includes the optical path of red S-polarized light emitted from the liquid crystal panel unit 119 and the optical path of blue or green S-polarized light emitted from the liquid crystal panel unit 120.
- the cross dichroic mirror 126 is disposed at this intersection.
- FIG. 2 shows an example of the cross dichroic mirror 126.
- the cross dichroic mirror 126 is composed of four right-angle prisms 126a to 126d whose surfaces forming a right angle are joined to each other.
- a uniform first plane is formed by the bonding surfaces of the right-angle prisms 126a and 126b and the bonding surfaces of the right-angle prisms 126c and 126d, and the dichroic film 1a is formed on the first plane.
- a uniform second plane that intersects (or is orthogonal to) the first plane is formed by the bonding surfaces of the right-angle prisms 126a and 126d and the bonding surfaces of the right-angle prisms 126b and 126c.
- a dichroic film 1b is formed in the second plane.
- both the green image light (P-polarized light) from the liquid crystal panel unit 118 and the red image light (S-polarized light) from the liquid crystal panel unit 119 are approximately 45 degrees on one surface of the dichroic film 1a.
- the blue or green image light (S-polarized light) from the liquid crystal panel unit 120 is incident at an incident angle and is incident on the other surface of the dichroic film 1a at an incident angle of approximately 45 degrees.
- FIG. 3 shows spectral transmission characteristics of the dichroic film 1a with respect to P-polarized light and S-polarized light.
- the vertical axis indicates the transmittance (%), and the horizontal axis indicates the wavelength (nm).
- the spectrum shown in the center is the emission spectrum of the green light source 101G.
- the cut-off wavelength is defined as the wavelength at which the transmittance is 50%.
- the cut-off wavelength of the dichroic film 1a with respect to light incident as P-polarized light is set so as to reflect light below the blue wavelength range and transmit light in other wavelength ranges (including green and red wavelength ranges). Has been.
- the cutoff wavelength of the dichroic film 1a with respect to light incident as S-polarized light transmits light in the red wavelength region or more, and reflects light in other wavelength regions (including green and blue wavelength regions). Is set to
- the dichroic film 1 a transmits both the green image light (P-polarized light) from the liquid crystal panel unit 118 and the red image light (S-polarized light) from the liquid crystal panel unit 119.
- the blue or green image light (S-polarized light) from the panel unit 120 is reflected.
- the green image light (P-polarized light) from the liquid crystal panel unit 118 and the blue or green image light (S-polarized light) from the liquid crystal panel unit 120 are both on one surface of the dichroic film 1b.
- the incident light is incident at an incident angle of approximately 45 degrees
- the red image light (S-polarized light) from the liquid crystal panel unit 119 is incident on the other surface of the dichroic film 1b at an incident angle of approximately 45 degrees.
- FIG. 4 shows the spectral transmission characteristics of the dichroic film 1b for P-polarized light and S-polarized light.
- the vertical axis indicates the transmittance (%), and the horizontal axis indicates the wavelength (nm).
- the spectrum shown in FIG. 4 is an emission spectrum of the red light source 101R.
- the cut-off wavelength of the dichroic film 1b for light incident as P-polarized light is set so as to reflect light in the red wavelength region and transmit light in other wavelength regions (green and blue).
- the dichroic film 1b transmits P-polarized light in the infrared wavelength region.
- the cutoff wavelength of the dichroic film 1b with respect to light incident as S-polarized light is set so as to transmit light having a wavelength less than or equal to the green wavelength range and reflect light in other wavelength ranges (including the red wavelength range). Has been.
- the dichroic film 1b transmits both the green image light (P-polarized light) from the liquid crystal panel unit 118 and the blue or green image light (S-polarized light) from the liquid crystal panel unit 120.
- the red image light (S-polarized light) from the liquid crystal panel unit 119 is reflected.
- the dichroic film 1a having the spectral transmission characteristics shown in FIG. 3 and the dichroic film 1b having the spectral transmission characteristics shown in FIG. 4 can both be formed of a dielectric multilayer film.
- the setting of the cutoff wavelength can be adjusted by the material of the dielectric multilayer film, the number of stacked layers, the film thickness, the refractive index, and the like.
- the slope of the right-angle prism 126a is the exit surface.
- the red image light (S-polarized light) from the liquid crystal panel unit 119 is reflected by the dichroic film 1b, and the reflected image light is emitted from the emission surface.
- Green image light (P-polarized light) from the liquid crystal panel 118 passes through the dichroic films 1a and 1b, and the transmitted image light is emitted from the emission surface.
- Green or blue image light (S-polarized light) from the liquid crystal panel unit 120 is reflected by the dichroic film 1a, and the reflected image light is emitted from the emission surface.
- image light obtained by combining red, blue, and green image light is emitted from the exit surface of the cross dichroic prism 126.
- the projection lens 127 shown in FIG. 1 is disposed at a position facing the exit surface of the cross dichroic prism 126.
- the projection lens 127 projects the image light emitted from the exit surface of the cross dichroic prism 126 onto the external screen.
- the external screen may be a dedicated screen or a structure such as a wall.
- the red light source 101R and the lenses 104, 111, 112, and 116 are the first illumination unit that irradiates the liquid crystal panel unit 119 with red light, but the configuration is not limited to the configuration illustrated in FIG. For example, the number of lenses is not limited to four and may be other numbers. Further, in the optical path of red light emitted from the red light source 101R, an optical component for uniform illuminance distribution such as a rod integrator or a fly eye integrator may be provided.
- the green light source 101G, the blue light source 101B, and the lenses 102, 103, 105, 106, 107, 108, 113, 114, 115, 117 irradiate the liquid crystal panel units 118, 120 with green light and the blue light with the liquid crystal panel unit 120. It is the 2nd illumination part which irradiates to.
- the configuration of the second illumination unit is not limited to the configuration shown in FIG. The number of lenses can be changed as appropriate.
- the above-described optical components for uniform illuminance distribution may be provided in the respective optical paths of the green light source 101G and the blue light source 101B.
- FIG. 5 shows the configuration of the control system.
- FIG. 5 is a conceptual block diagram in which the lens system is omitted to simplify the description.
- control system includes a control unit 1, a light source driving unit 201, and a liquid crystal driving unit 203.
- the control unit 1 supplies drive timing signals for driving the liquid crystal panel units 118 to 120 to the liquid crystal drive unit 3.
- the control unit 1 supplies lighting timing signals for driving the blue light source 101B, the green light source 101G, and the red light source 101R to the light source driving unit 2, respectively.
- the light source driving unit 2 individually controls the lighting states of the red light source 101R, the green light source 101G, and the blue light source 101B according to the lighting timing signal from the control unit 1.
- the liquid crystal drive unit 3 individually drives the liquid crystal panel units 118 to 120 based on the video signal input from the external video supply device and the drive timing signal from the control unit 1.
- the external video supply device is an information processing device such as a personal computer.
- FIG. 6 is a timing chart for explaining the lighting operation of the blue light source 101B, the green light source 101G, and the red light source 101R and the display operation of the liquid crystal panel units 118 to 120.
- one frame includes first and second subframes.
- the first and second subframes are the same length.
- the frame period is 60 Hz and the subframe period is 120 Hz. Note that the ratio between the period of the first subframe and the period of the second subframe in one frame can be set as appropriate.
- the light source driving unit 2 turns on the blue light source 101B and turns off the green light source 101G, and the liquid crystal driving unit 3 is obtained from the input video signal.
- An image based on the blue video signal is displayed on the liquid crystal panel unit 120.
- the liquid crystal panel unit 120 displays a blue image, but the liquid crystal panel unit 118 is not displayed.
- the light source driving unit 2 turns off the blue light source 101B and turns on the green light source 101G, and the liquid crystal driving unit 3 is obtained from the input video signal. Images based on the green video signal are displayed on the liquid crystal panel units 118 and 120, respectively. In this case, the liquid crystal panel units 118 and 120 each display a green image.
- the light source driving unit 2 turns on the blue light source 101R, and the liquid crystal driving unit 3 causes the liquid crystal panel unit 119 to display an image based on the red video signal obtained from the input video signal. In this case, the liquid crystal panel unit 119 displays a red image.
- a blue image is displayed on the liquid crystal panel unit 120 and a red image is displayed on the liquid crystal panel unit 119 during the period of the first subframe of n frames.
- a red image is displayed on the liquid crystal panel unit 119 and a green image is displayed on the liquid crystal panel unit 118. Therefore, due to the integral effect of the human eye, the observer can, in n frames, display the blue and green images displayed during the first subframe period and the red and green images displayed during the second subframe period. It is possible to observe a color image obtained by synthesizing these images.
- the red light from the red light source 101R is applied to the liquid crystal panel unit 119.
- Green light from the green light source 101G is separated into P-polarized light and S-polarized light by the polarization beam splitter 121, and the liquid crystal panel unit 118 is irradiated with green S-polarized light.
- the green P-polarized light is combined with the blue light (unpolarized light) from the blue light source 101B by the dichroic mirror 124, and the combined blue and green light is irradiated to the liquid crystal panel unit 120 through the same optical path. .
- the etendue value on the light source side does not increase.
- the liquid crystal panel units 119 and 120 are configured to receive P-polarized light and emit S-polarized light, and the liquid crystal panel unit 118 receives S-polarized light and emit P-polarized light. Is configured to do.
- the green S-polarized light from the green light source 101G is irradiated to the liquid crystal panel unit 118, and the green P-polarized light from the green light source 101G is irradiated to the liquid crystal panel unit 120. Therefore, there is almost no light loss in the liquid crystal panel units 118 and 120 for the green light from the green light source 101G.
- the liquid crystal panel unit 119 has about half the light amount of the red light from the red light source 101R and the blue light from the blue light source 101B. , 120 is absorbed or reflected.
- the output characteristics of red LED, green LED, and blue LED are different, and at present, the maximum output value of green LED is the smallest, and then the maximum output value of red LED is small.
- the output range of the red LED and the blue LED is set based on the maximum output value of the green LED, there is some margin in the output of the red LED and the blue LED. Therefore, when an LED is used as the light source, the output of the red light source 101R and the blue light source 101B is increased in consideration of light loss due to the liquid crystal panel, so that a reduction in the red and blue light amounts can be suppressed to some extent.
- liquid crystal projector of the present embodiment is an example of the present invention, and the configuration thereof can be changed as appropriate.
- the green light source 101G and the blue light source 101B may be driven in a time-sharing manner with twice the normal current.
- the light amounts of the green light source 101G and the blue light source 101B are substantially the same as the light amounts when the green light source 101G and the blue light source 101B are continuously lit for a period of one frame.
- the green light source 101G and the blue light source 101B may be lit for one frame period.
- the liquid crystal panel unit 120 displays an image based on blue and green light as an image based on the blue video signal in one frame period.
- the green light source 101G and the blue light source 101B can be continuously turned on, it is possible to provide a brighter projection image as compared with the operation shown in FIG.
- the green light source 101G is configured to reduce light loss in the liquid crystal panel without using a polarization conversion element, thereby increasing the brightness of the projected image. Cost reduction is planned.
- the number of the green light sources 101G is one, and the cost can be reduced and the size can be reduced as the number of light sources is small.
- FIG. 7 is a schematic diagram showing a configuration of a liquid crystal projector according to the second embodiment of the present invention.
- the liquid crystal projector shown in FIG. 7 is the same as that of the first embodiment except that a polarizing beam splitter 122, a reflecting mirror 125, and lenses 109 and 110 are added, and a cross dichroic mirror 123 is provided instead of the reflecting mirror 127. It is the same composition as. In FIG. 7, the same components are denoted by the same reference numerals, and detailed description thereof is omitted here.
- the lens 104 and the polarization beam splitter 122 are arranged in the traveling direction of the red light from the red light source 102. Red light from the red light source 102 enters the polarization beam splitter 122 via the lens 104.
- the polarization beam splitter 122 splits incident light into first and second linearly polarized light that vibrate in a direction perpendicular to each other.
- first linearly polarized light is S-polarized light
- second linearly polarized light is P-polarized light
- the polarization beam splitter 122 has a polarization separation characteristic that reflects S-polarized light and transmits P-polarized light.
- Lenses 110 and 109 and a cross dichroic mirror 123 are arranged in the traveling direction of the red S-polarized light reflected by the polarization beam splitter 122.
- the polarization beam splitters 121 and 122 are provided so that the central light beam of green S-polarized light reflected by the polarization beam splitter 121 matches the central light beam of red S-polarized light reflected by the polarization beam splitter 122. .
- the cross dichroic mirror 123 includes dichroic films 123a and 123b that cross (or are orthogonal to) each other.
- the dichroic film 123a has a characteristic of reflecting red and transmitting green with respect to S-polarized light.
- the dichroic film 123b has characteristics of transmitting red and reflecting green with respect to S-polarized light.
- the red S-polarized light reflected by the polarization beam splitter 122 enters the cross dichroic mirror 123 via the lenses 110 and 109.
- the green S-polarized light reflected by the polarization beam splitter 121 enters the cross dichroic mirror 123 through the lenses 105 and 106.
- the red S-polarized light from the polarizing beam splitter 122 is reflected by the dichroic film 123a
- the green S-polarized light from the polarizing beam splitter 121 is reflected by the dichroic film 123b.
- the red S-polarized light reflected by the dichroic film 123a and the green S-polarized light reflected by the dichroic film 123b are irradiated to the liquid crystal panel unit 118 via the lens 115 in the same optical path.
- Lenses 111 and 112 and a reflection mirror 125 are arranged in the traveling direction of the red P-polarized light transmitted through the polarization beam splitter 122.
- the red P-polarized light transmitted through the polarization beam splitter 122 sequentially passes through the lenses 111 and 112 and is then reflected by the reflection mirror 125 at an angle of approximately 90 °.
- the red P-polarized light reflected by the reflection mirror 125 is applied to the liquid crystal panel unit 119 through the lens 116.
- the reflection mirror 125 may be a mirror having any reflection characteristic as long as it can reflect red light.
- the reflecting mirror 125 may be an aluminum-deposited mirror, or a dichroic mirror made of a dielectric multilayer film that reflects red light and transmits or absorbs light of other colors. .
- the liquid crystal projector of the present embodiment also has a control system similar to the configuration shown in FIG. 5, except that the blue light source 101B, the green light source 101G, and the red light source 101R are turned on in a time-sharing manner, respectively. And different.
- FIG. 9 is a timing chart for explaining the lighting operation of the blue light source 101B, the green light source 101G, and the red light source 101R and the display operation of the liquid crystal panel units 118 to 120.
- one frame includes first and second subframes.
- the first and second subframes are the same length.
- the frame period is 60 Hz and the subframe period is 120 Hz.
- the light source driving unit 2 turns on the blue light sources 101B and 101R and turns off the green light source 101G. Then, the liquid crystal driving unit 3 displays an image based on the blue video signal obtained from the input video signal on the liquid crystal panel unit 120, and displays an image based on the red video signal obtained from the input video signal on the liquid crystal panel unit 118, 119 is displayed. In this case, the liquid crystal panel units 118 and 119 display a red image, and the liquid crystal panel unit 120 displays a blue image.
- the light source driving unit 2 turns off the blue light sources 101B and 101R and turns on the green light source 101G. Then, the liquid crystal driving unit 3 displays images based on the green video signal obtained from the input video signal on the liquid crystal panel units 118 and 120, respectively. In this case, the liquid crystal panel units 118 and 120 each display a green image, but the liquid crystal panel unit 119 is not displayed.
- a blue image is displayed on the liquid crystal panel unit 120 and a red image is displayed on the liquid crystal panel units 118 and 119 during the period of the first subframe of n frames.
- a green image is displayed on the liquid crystal panel units 118 and 120. Therefore, due to the integration effect of the human eye, in the n frame, the observer can display the blue and red images displayed during the first subframe period and the green image displayed during the second subframe period. Can be observed.
- the green light from the green light source 101G is separated into P-polarized light and S-polarized light by the polarization beam splitter 121, and the green S-polarized light is converted into the liquid crystal panel unit. 118 is irradiated.
- the green P-polarized light is combined with the blue light (unpolarized light) from the blue light source 101B by the dichroic mirror 124, and the combined blue and green light is applied to the liquid crystal panel unit 120 through the same optical path. .
- the red light from the red light source 101R is separated into P-polarized light and S-polarized light by the polarization beam splitter 122, and the liquid crystal panel unit 119 is irradiated with the red P-polarized light.
- the red P-polarized light is combined with green light from the green light source 101G by the cross dichroic mirror 123, and the combined red and green light is irradiated to the liquid crystal panel unit 118 through the same optical path.
- the etendue value on the light source side does not increase.
- the green S-polarized light from the green light source 101G is irradiated to the liquid crystal panel unit 118
- the green P-polarized light from the green light source 101G is irradiated to the liquid crystal panel unit 120.
- green light from the green light source 101G light loss in the liquid crystal panel units 118 and 120 hardly occurs.
- the red S-polarized light from the red light source 101R is applied to the liquid crystal panel unit 118
- the red P-polarized light from the red light source 101R is applied to the liquid crystal panel unit 119.
- the maximum output values of the red light source 101R and the green light source 1G are smaller than that of the blue light source 101B. Therefore, by increasing the light use efficiency of the red light source 101R and the green light source 1G whose maximum output values are smaller than those of the blue light source 101B, it is possible to provide a projected image with excellent color reproducibility.
- At least one of the red light source 101R, the green light source 101G, and the blue light source 101B may be a light source using a phosphor.
- FIG. 10 shows a configuration of a liquid crystal projector according to another embodiment of the present invention.
- the liquid crystal projector shown in FIG. 10 has the same configuration as that of the first embodiment except that a green light source 201G is provided instead of the green light source 101G.
- a green light source 201G is provided instead of the green light source 101G.
- the same components are denoted by the same reference numerals, and detailed description thereof is omitted here.
- FIG. 11 shows a phosphor wheel 302
- FIG. 12 shows a configuration of a green light source 201G provided with the phosphor wheel 302.
- the phosphor wheel 302 includes a disc-shaped substrate, and a phosphor that is excited by excitation light and emits green fluorescence is applied to one surface of the substrate.
- the substrate is made of a material that transmits excitation light.
- the central portion of the phosphor wheel 302 is held on the output shaft of the motor 303, and the phosphor wheel 302 can be rotated by the motor 303.
- the excitation light source 301 is disposed on the surface of the phosphor wheel 302 opposite to the surface coated with the phosphor.
- the excitation light source 301 is turned on while rotating the phosphor wheel 302, and green fluorescence is emitted from the phosphor surface of the phosphor wheel 302.
Abstract
Description
それぞれが入射光を空間的に変調して画像を表示する第1乃至第3の液晶パネル部と、
赤色の波長帯域にピーク波長を有する赤色光を出力する赤色光源を備え、該赤色光源から出力された前記赤色光が前記第1の液晶パネル部に照射される第1の照明部と、
緑色の波長帯域にピーク波長を有する緑色光を出力する緑色光源と、青色の波長帯域にピーク波長を有する青色光を出力する青色光源とを備え、該緑色光源から出力された前記緑色光を振動方向が互い直交する第1および第2の直線偏光に分離し、該第1の直線偏光を前記第2の液晶パネル部に照射させ、該第2の直線偏光と該青色光源から出力された前記青色光とを前記第3の液晶パネル部に照射させる第2の照明部と、
前記第1乃至第3の液晶パネル部で表示された画像を合成する偏光色合成部と、
前記偏光色合成部で合成された合成画像光を投射する投射レンズと、
入力映像信号に基づいて、前記赤色光源、緑色光源および青色光源の点灯状態を制御し、前記第1乃至第3の液晶パネル部に画像を表示させる制御手段と、を有する。
赤色の波長帯域にピーク波長を有する赤色光を出力する赤色光源と、
緑色の波長帯域にピーク波長を有する緑色光を出力する緑色光源と、
青色の波長帯域にピーク波長を有する青色光を出力する青色光源と、
前記赤色光源から出力された前記赤色光を振動方向が互い直交する第1および第2の直線偏光に分離する第1の偏光分離部と、
前記緑色光源から出力された前記緑色光を前記第1および第2の直線偏光に分離する第2の偏光分離部と、
前記第1の直線偏光の赤色光と前記第1の直線偏光の緑色光とを入射光とし、該入射した赤色および緑色の光を同一の光路で出射する第1の色合成部と、
前記第2の直線偏光の緑色光と前記青色光源から出射された前記青色光とを入射光とし、該入射した緑色および青色の光を同一の光路で出射する第2の色合成部と、
前記第2の直線偏光の赤色光を空間的に変調して画像を表示する第1の液晶パネル部と、
前記第1の色合成部から出射された前記赤色および緑色の光を空間的に変調して画像を表示する第2の液晶パネル部と、
前記第2の色合成部から出射された前記緑色および青色の光を空間的に変調して画像を表示する第3の液晶パネル部と、
前記第1乃至第3の液晶パネルで表示された画像を合成する偏光色合成部と、
前記第2の偏光色合成部で合成された画像光を投射する投射レンズと、
入力映像信号に基づいて、前記赤色光源、緑色光源および青色光源の点灯状態を制御し、前記第1乃至第3の液晶パネル部に画像を表示させる制御手段と、を有する。
101G 緑色光源
101R 赤色光源
121 偏光ビームスプリッタ
118、119、120 液晶パネル部
126 クロスダイクロプリズム
127 投射レンズ
(第1の実施形態)
図1は、本発明の第1の実施の形態である液晶プロジェクタの構成を示す模式図である。
図7は、本発明の第2の実施形態である液晶プロジェクタの構成を示す模式図である。
上述した第1または第2の実施形態の液晶プロジェクタにおいて、赤色光源101R、緑色光源101G、青色光源101Bのうちの少なくとも1つを蛍光体を用いた光源としてもよい。
Claims (6)
- それぞれが入射光を空間的に変調して画像を表示する第1乃至第3の液晶パネル部と、
赤色の波長帯域にピーク波長を有する赤色光を出力する赤色光源を備え、該赤色光源から出力された前記赤色光が前記第1の液晶パネル部に照射される第1の照明部と、
緑色の波長帯域にピーク波長を有する緑色光を出力する緑色光源と、青色の波長帯域にピーク波長を有する青色光を出力する青色光源とを備え、該緑色光源から出力された前記緑色光を振動方向が互い直交する第1および第2の直線偏光に分離し、該第1の直線偏光を前記第2の液晶パネル部に照射させ、該第2の直線偏光と該青色光源から出力された前記青色光とを前記第3の液晶パネル部に照射させる第2の照明部と、
前記第1乃至第3の液晶パネル部で表示された画像を合成する偏光色合成部と、
前記偏光色合成部で合成された合成画像光を投射する投射レンズと、
入力映像信号に基づいて、前記赤色光源、緑色光源および青色光源の点灯状態を制御し、前記第1乃至第3の液晶パネル部に画像を表示させる制御手段と、を有する、液晶プロジェクタ。 - 赤色の波長帯域にピーク波長を有する赤色光を出力する赤色光源と、
緑色の波長帯域にピーク波長を有する緑色光を出力する緑色光源と、
青色の波長帯域にピーク波長を有する青色光を出力する青色光源と、
前記赤色光源から出力された前記赤色光を振動方向が互い直交する第1および第2の直線偏光に分離する第1の偏光分離部と、
前記緑色光源から出力された前記緑色光を前記第1および第2の直線偏光に分離する第2の偏光分離部と、
前記第1の直線偏光の赤色光と前記第1の直線偏光の緑色光とを入射光とし、該入射した赤色および緑色の光を同一の光路で出射する第1の色合成部と、
前記第2の直線偏光の緑色光と前記青色光源から出射された前記青色光とを入射光とし、該入射した緑色および青色の光を同一の光路で出射する第2の色合成部と、
前記第2の直線偏光の赤色光を空間的に変調して画像を表示する第1の液晶パネル部と、
前記第1の色合成部から出射された前記赤色および緑色の光を空間的に変調して画像を表示する第2の液晶パネル部と、
前記第2の色合成部から出射された前記緑色および青色の光を空間的に変調して画像を表示する第3の液晶パネル部と、
前記第1乃至第3の液晶パネル部で表示された画像を合成する偏光色合成部と、
前記第2の偏光色合成部で合成された合成画像光を投射する投射レンズと、
入力映像信号に基づいて、前記赤色光源、緑色光源および青色光源の点灯状態を制御し、前記第1乃至第3の液晶パネル部に画像を表示させる制御手段と、を有する、液晶プロジェクタ。 - 前記第1乃至第3の液晶パネル部は、前記第1又は第2の直線偏光による画像を出力し、
前記偏光色合成部は、
前記第1ないし第3の液晶パネル部それぞれの出射光を入射する第1ないし第3の入射面および前記合成画像光を出射する出射面と、
前記第1の入射面より入射した前記赤色光を反射して前記第1の出射面より出射させ、前記第2の入射面より入射した前記第2の直線偏光の緑色光を透過して前記第1の出射面より出射させ、前記第3の入射面より入射した前記青色光を透過する機能を備える第1の反射面と、
前記第3の入射面より入射した前記青色光を反射して前記第1の出射面より出射させ、前記第2の入射面より入射した前記第1の直線偏光の緑色光を透過して前記第1の出射面より出射させ、前記第1の入射面より入射した前記赤色光を透過する機能を備える第1の反射面と、を有する、請求項1または2に記載の液晶プロジェクタ。 - 前記制御手段は、
所定の期間において、前記赤色光源を点灯させて赤色画像を前記第1の液晶パネル部に表示させ、
前記所定の期間を所定の割合で分割した第1および第2の期間のうち、該第1の期間において、前記青色光源を点灯させて青色画像を前記第3の液晶パネル部に表示させ、前記第2の期間において、前記緑色光源を点灯させて緑色画像を前記第2および第3の液晶パネル部に表示させる、請求項1に記載の液晶プロジェクタ。 - 前記制御手段は、
所定の期間を所定の割合で分割した第1および第2の期間のうち、該第1の期間において、前記青色光源を点灯させて青色画像を前記第3の液晶パネル部に表示させるとともに、前記赤色光源を点灯させて赤色画像を前記第1および第2の液晶パネル部に表示させ、該第2の期間において、前記緑色光源を点灯させて前記緑色画像を前記第2および第3の液晶パネル部に表示させる、請求項2に記載の液晶プロジェクタ。 - 前記赤色光源、緑色光源および青色光源の少なくとも1つの光源は、励起光を出力する励起光源と、前記励起光により励起されることで蛍光を放出する蛍光体とから構成されている、請求項1から5のいずれか1項に記載の液晶プロジェクタ。
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JP2005189472A (ja) * | 2003-12-25 | 2005-07-14 | Olympus Corp | 表示装置及びそれに使用する照明装置 |
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WO2014020894A1 (ja) * | 2012-08-02 | 2014-02-06 | 日本電気株式会社 | 投射型表示装置及び投射光発生方法 |
WO2014020895A1 (ja) * | 2012-08-02 | 2014-02-06 | 日本電気株式会社 | 投射型表示装置及び投射光発生方法 |
US9195125B2 (en) | 2012-08-02 | 2015-11-24 | Nec Corporation | Projection display apparatus and projection light generating method |
US9304384B2 (en) | 2012-08-02 | 2016-04-05 | Nec Corporation | Projection display apparatus and projection light generating method |
JPWO2014020894A1 (ja) * | 2012-08-02 | 2016-07-21 | 日本電気株式会社 | 投射型表示装置及び投射光発生方法 |
JPWO2014020895A1 (ja) * | 2012-08-02 | 2016-07-21 | 日本電気株式会社 | 投射型表示装置及び投射光発生方法 |
GR1009742B (el) * | 2019-04-24 | 2020-05-22 | Νικολαος Μεθοδιου Εμμανουηλ | Ανεμογεννητρια εδαφους οριζοντιου αξονα |
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US20140160364A1 (en) | 2014-06-12 |
JP5748242B2 (ja) | 2015-07-15 |
CN103718103A (zh) | 2014-04-09 |
CN103718103B (zh) | 2015-09-02 |
US9140913B2 (en) | 2015-09-22 |
JPWO2013014794A1 (ja) | 2015-02-23 |
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