WO2006137416A1 - 投射型表示装置 - Google Patents
投射型表示装置 Download PDFInfo
- Publication number
- WO2006137416A1 WO2006137416A1 PCT/JP2006/312356 JP2006312356W WO2006137416A1 WO 2006137416 A1 WO2006137416 A1 WO 2006137416A1 JP 2006312356 W JP2006312356 W JP 2006312356W WO 2006137416 A1 WO2006137416 A1 WO 2006137416A1
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- WO
- WIPO (PCT)
- Prior art keywords
- aperture
- diaphragm
- light
- projection
- display device
- Prior art date
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Classifications
-
- 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
-
- 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
-
- 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
-
- 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
- G03B21/145—Housing details, e.g. position adjustments thereof
-
- 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
Definitions
- the present invention relates to, for example, a projection type display device such as a liquid crystal projector.
- a liquid crystal projector is a projector device that uses a spatial light modulator (hereinafter, "liquid crystal panel”) using a liquid crystal material.
- liquid crystal panel a spatial light modulator
- the liquid crystal panel itself does not emit light. Therefore, in a liquid crystal projector, a liquid crystal panel and a light source are combined, and the liquid crystal panel is illuminated by light.
- a video signal is applied to the liquid crystal panel, and an image formed by the liquid crystal panel is projected on a screen by a projection lens.
- liquid crystal projector having such a configuration, a compact and efficient projector device can be realized.
- Some liquid crystal materials have a property (lighting property) to change the polarization of incident light according to an applied electric field.
- light incident on the liquid crystal panel needs to be linearly polarized light (p polarized light or s polarized light) in one direction.
- the light emitted from the liquid crystal panel has its polarization direction rotated in accordance with the video signal applied to the liquid crystal panel.
- a polarizer is disposed as an analyzer on the exit side of the liquid crystal panel.
- Patent Document 1 Japanese Patent Application Laid-Open No. 8-106090
- illumination light incident on the liquid crystal panel has a finite angle distribution according to the illumination design.
- the polarization characteristics of the light obliquely incident on the liquid crystal panel are disturbed by the orientation (pretilt) of the liquid crystal molecules (linearly polarized light becomes elliptically polarized), and the light is leaked from the analyzer to lower the contrast.
- the F-number of the illumination optical system is increased (ie, the aperture diameter is decreased), the light output is reduced.
- the incident angle to the liquid crystal panel is close to vertical, so that the polarization characteristic is improved and the contrast is increased.
- the F-number of the illumination optical system is increased, the optical path length is increased, and the volume occupied by the illumination device is increased. As a result, it has a combination of an increase in set size and an increase in material cost.
- the lamp drive voltage is switched to the Lo mode during program playback where there are many dark scenes such as movies, and the aperture is turned on (eg light blocking ratio 20%) to achieve black level.
- the aperture is turned on (eg light blocking ratio 20%) to achieve black level.
- contrast Cinema Black Pro etc. modes).
- the aperture is on and the light is partially blocked, and the white level also decreases, so the brightness in bright scenes decreases accordingly.
- the contrast improvement is only about 20%, and no significant improvement can be expected.
- a stepping motor is often used because the control method is simple, and it is possible to operate continuously and at high speed according to the illuminance of the screen on which the projection is performed. Since it generates offensive excitation noise, it is a noise source for home projectors that require quietness, and is unsuitable for use.
- the present invention can suppress the increase of the set size and the increase of the material cost, and the contrast It is an object of the present invention to provide a projection type display device which is improved in noise and has low noise and excellent quietness at the time of aperture operation.
- a projection type display device comprising: light modulation means for modulating and emitting illumination light incident based on input image information; and illumination light from the light source as the light.
- the illumination optical device to be incident on the modulation means, and the projection optical system to project the illumination light emitted from the light modulation means, and the variable aperture stop device is disposed in the vicinity of the pupil position of the projection optical system.
- the diaphragm device is disposed so as to match the contrast characteristic of the light modulation means with the diaphragm shape at the time of opening and closing the diaphragm.
- the diaphragm device slides the two diaphragm blades by a drive system to form a diaphragm region.
- an edge forming at least the throttling area of the diaphragm blade includes a curvilinear portion.
- an edge portion forming at least the throttling area of the diaphragm blade is formed into a shape having a predetermined curvature.
- the curvature shape portions of the two diaphragm blades are formed to have an oval shape at the time of diaphragm.
- the diaphragm device is formed detachably with respect to the lens barrel portion of the projection optical system.
- an air flow path of circulating cooling air is formed for the throttling device disposed in the projection optical system.
- the throttling device has an actuator that drives the opening operation by means of a connecting link mechanism.
- the actuator includes a galvanometer having a hall element, and the hall element has a two-terminal output, and differentially amplifies the first output of the hall element and the reference voltage to generate a hall voltage. And a second differential amplification amplification circuit that differentially amplifies and outputs the second output of the Hall element and the reference voltage.
- the illumination optical device comprises: a light source for emitting illumination light; and a pair of first light sources disposed at predetermined intervals on an optical axis for equalizing the illumination light emitted from the light source. And one multi-lens lens and a second multi-lens array.
- the diaphragm device is formed such that the light blocking ratio is other than 100% even in the fully closed state.
- the diaphragm device includes a plurality of diaphragm blades, and the plurality of diaphragm blades are synchronously opened and closed.
- a projection-type display device comprising: a liquid crystal panel that modulates and emits illumination light incident based on input image information; and the above light modulation of illumination light from the light source And a projection optical system for projecting the illumination light emitted from the light modulation means, and a variable aperture stop device is disposed in the vicinity of the pupil position of the projection optical system.
- the desired high contrast region in the light incident angle characteristic distribution of the liquid crystal panel has an oval shape, and the major axis of the oval is at a predetermined angle with respect to the orthogonal axis of the two-dimensional distribution characteristic.
- the diaphragm device has two diaphragm blades having a predetermined curvature, and the diaphragm opening shape formed by the opposing edges of the two diaphragm blades is long.
- a circular diaphragm shape, and the oval shape of the diaphragm is the above liquid crystal panel It is arranged so as to match the oblong shape of the high contrast region, Ru.
- the diaphragm device when installed at a predetermined place, it is possible to significantly improve the contrast of the image projected on the screen without changing the optical design of the projection optical system.
- the installation volume of the projection optical system due to the installation of the throttling device is only in the vicinity of the portion where the throttling device is attached, and the performance can be greatly improved without impairing the commercial property.
- FIG. 1 is a diagram in principle showing a liquid crystal projector (projection type display device) adopting an optical device according to the present embodiment.
- FIG. 2 is a view showing a mounting form of a liquid crystal projector (projection type display device) adopting the optical device according to the present embodiment.
- FIG. 3 is a view showing an arrangement of an optical system in the case where the optical axis of the liquid crystal projector according to the present embodiment is arranged in a straight line and the light beam is not shown.
- FIG. 4 is a view showing an example of the configuration at the time of opening of the diaphragm device according to the present embodiment.
- FIG. 5 is a view showing an example of the configuration at the minimum aperture diameter of the aperture device according to the present embodiment.
- FIGS. 6A and 6B are diagrams for explaining the configuration of the base of the diaphragm device according to the present embodiment.
- FIGS. 7A to 7C are diagrams for explaining an example of a suitable aperture shape.
- FIGS. 8A to 8C are diagrams for explaining another example of the preferred aperture shape.
- FIG. 9 is a view showing an example of the attachment structure of the diaphragm device to the lens barrel portion in the present embodiment.
- FIGS. 10A and 10B are diagrams showing the illumination light angular distribution of the panel and the illumination light angle dependency of the panel contrast.
- FIGS. 11A to 11C are diagrams for explaining the illumination light angle dependency of the panel contrast.
- FIG. 12 is a view for explaining an example of arrangement in accordance with the panel contrast characteristic and the cat's eye shape at the time of opening and closing the aperture.
- FIG. 13 is a view showing the relationship between the magnitude of the light ray angle and the contrast and the brightness.
- FIG. 14 is a view for explaining the shape of a desired high contrast area in the light incident angle characteristic of the liquid crystal panel.
- FIG. 15 is a view showing an example of an aperture shape which satisfies a desired condition.
- FIGS. 16A to 16C are diagrams showing an example of the arrangement of the diaphragms of the panel contrast adopted in the verification.
- FIG. 17 is a view showing the contrast increase rate of each aperture shape type.
- FIG. 18 is a circuit diagram showing an example of a galvanometer according to the present embodiment.
- FIG. 19 is a circuit diagram showing a first example of a Hall element amplification system circuit according to the present embodiment.
- FIG. 20 is a circuit diagram showing a second example of the Hall element amplification system circuit according to the present embodiment.
- FIG. 21 is a view showing a cooling structure for the diaphragm device of the liquid crystal projector according to the present embodiment.
- FIG. 22 is a view showing a cooling structure for the diaphragm device of the liquid crystal projector according to the present embodiment.
- dichroic mirror 111, 112, 113 ⁇ ⁇ reflection mirror, 120R , 120 G, 120 ⁇ ⁇ ⁇ Condensing lens, 121 R, 121 G ⁇ 121 ⁇ ⁇ Polarizing plate, 122 R, 122 G, 122 ⁇ ⁇ ⁇ Liquid crystal panel, 123 R, 123 G, 123 B ... polarizing plate, 124 ... dichroic prism, 125 ⁇ ⁇ Projection optical system, 130, 131 ⁇ ⁇ Relay lens, 200 ⁇ ⁇ Aperture device, 201 ⁇ ⁇ Base body, 202, 203 ⁇ ⁇ Aperture blade.
- FIG. 1 is a diagram in principle showing a liquid crystal projector (projection display device) adopting an optical device according to an embodiment of the present invention.
- FIG. 2 is a view showing a liquid crystal projector (projection display device) adopting the optical device according to the embodiment of the present invention.
- the liquid crystal projector 100 includes a light source unit 101, a collimator lens 102, an optical filter 103, a first multi-lens array (MLA) 104, a second MLA 105, and the like.
- Polarization conversion element 106 condensing lens 107, dichroic mirror 110R, 110G, reflection mirror 111, 112, 113, condensing lens 120R, 120G, 120B, polarizing plates 121R, 121G, 121B, liquid crystal panel 122R, 122G , 122B, polarizing plates 123R, 123G, 123B, dichroic prism 124, a projection optical system 125 including an aperture unit 200, relay lenses 130, 131 and the like.
- An illumination optical system 108 is configured by the light source unit 101, the collimator lens 102, the optical filter 103, the first MLA 104, the second MLA 105, the polarization conversion element 106, and the condenser lens 107.
- the diaphragm device 200 which is a characteristic part of the present embodiment, is disposed in the vicinity of!, A lens pupil position (common to RGB) of the projection optical system 125 which is not included in the illumination optical system 108.
- the liquid crystal projector 100 varies the aperture diameter of the aperture device 200 in conjunction with APL (average picture level) of the video signal, and controls the amplitude of the video signal.
- APL average picture level
- the aperture device 200 will be described in detail later. Thus, it has a simple structure in which two plate blades slide, and has the following features.
- the ghosting of rectangular openings is eliminated as an open-type slide with an R shape in which two plate blades have a specified curvature to form an R shape.
- a so-called cat's eye (cat's eye) shape is formed by the mutually opposing edges of two R-shaped plate blades having a predetermined curvature.
- the aperture is opened and closed corresponding to the shape of the fly's eye of the first MLA 104 and the second MLA 105 so that the light quantity becomes uniform.
- the serviceability is improved as a mechanism in which the diaphragm device 200 can be detached from the lens barrel of the projection optical system 125.
- the light source unit 101 includes a discharge lamp 101 a and a reflective condensing mirror 101 b, and the light emitted from the discharge lamp 101 a is collected by the reflective condensing mirror 101 b and directed to the collimator lens 102. I will emit.
- the collimator lens 102 is configured to convert the illumination light L emitted from the light source unit 101 into a parallel bundle as an optical flux. Emit towards filter 103.
- the optical filter 103 removes unnecessary light in the infrared region and the ultraviolet region contained in the illumination light L emitted from the light source unit 101 and passing through the collimator lens 102.
- the first MLA 104 divides the illumination light L from the light source unit 101 into a plurality of pieces, and arranges their optical images in the vicinity of the light incident surface of the second MLA 105.
- a plurality of lenses are arranged in an array, and the illumination light
- Second MLA is divided into a plurality of light beams and collected, and the light spot of each divided image is placed at a predetermined position (second MLA
- the image of the light source unit 101 formed by focusing on the second MLA 105 is projected near the arrangement position of the stop device 200 of the projection optical system 125, that is, near the pupil position of the lens.
- the second MLA 105 receives the split light source image by the first MLA 104 in the liquid crystal panel 122 R, 12.
- the light is incident on the polarization conversion element 106 so as to be usable as illumination light of 2G and 122B.
- the second MLA 105 a plurality of lenses corresponding to the plurality of light spots collected by the first MLA 104 are disposed.
- Each lens of the second MLA 105 forms an image by superimposing the divided image by the first MLA 104 on the liquid crystal panels 122 R, 122 G, and 122 B through the condenser lens 107, and uniformly emits the light emitted from the light source unit 101.
- the polarization conversion element 106 includes a polarization converter, a polarization beam splitter arranged in a strip shape, and a retardation plate intermittently provided corresponding to the polarization conversion element 106, and the p polarization component of the incident illumination light L is It converts the light into s-polarization components, and outputs illumination light of the same polarization direction containing a large amount of s-polarization components as a whole.
- Condensing lens 107 has illumination light L that has passed through polarization conversion element 106 as liquid crystal panel 122 R, 1
- Light is collected so as to be superimposed at 22G and 122B.
- the dichroic mirror 110 R is inclined 45 degrees with respect to the optical axis of the illumination light L having the same polarization direction that has passed through the condensing lens 107, and the light in the red wavelength region of the illumination light L is (Red light and may be) LR only reflects toward the reflective mirror 111, and light in other wavelength range
- the reflection mirror 111 is inclined 45 degrees with respect to the optical axis of the light LR reflected by the dichroic mirror 110R, and reflects toward the light LR ⁇ ⁇ light lens 120R.
- the dichroic mirror 110G is tilted 45 degrees with respect to the optical axis of the light LGB transmitted through the dichroic mirror 110R, and the light in the green wavelength range of the light LGB transmitted through the dichroic mirror 110R (green It is also called light) LG only ⁇ Reflects toward the light lens 120G and transmits light LB of other wavelength range (blue wavelength range).
- the relay lenses 130 and 131 are light in the blue wavelength range (sometimes referred to as blue light) LB dichroic mirror 110 G power Because the optical path length to the liquid crystal panel 122 B is relatively long, the blue light is generated along the optical path. It is provided to re-image the LB.
- the light LB in the blue wavelength range that has passed through the dichroic mirror 110 G passes through the relay lenses 130 and 131, and is reflected by the reflection mirror 113 toward the condensing lens 120 G.
- the condenser lenses 120 R, 120 G, and 120 B and the liquid crystal non-lenses 122 R, 122 G, and 122 B are disposed at predetermined positions with respect to the three side surfaces of the dichroic prism 124 in a prism shape.
- polarizers 121R, 121G, and 121B as polarizers and polarizers 123R, 123G, and 123B as analyzers are disposed on the incident side and the emission side of the liquid crystal panels 122R, 122G, and 122B, respectively. There is.
- the polarizing plates 121R, 121G, and 121B are respectively fixed to the exit side of the condensing lenses 120R, 120G, and 120B, and the polarizing plates 123R, 123G, and 123B are three surfaces on the incident side of the dichroic prism 124, respectively. It is fixed.
- the liquid crystal panels 122R, 122G, and 122B have intensities of respective color lights LR, LG, and LB incident through the condensing lenses 120R, 120G, and 120B by the video signals corresponding to the three primary colors of red, green, and blue applied. Modulate
- the color lights LR, LG, LB of the predetermined polarization direction transmitted through the polarizing plates 121R, 121G, 121B rotate their polarization planes based on the video signals applied to the liquid crystal panels 122R, 122G, 122B.
- Predetermined polarization components of the light rotated in the polarization plane transmit through the polarization plates 123 R, 123 G, and 123 B, and enter the dichroic prism 124.
- the dichroic prism 124 is configured, for example, by bonding a plurality of glass prisms, and an interference film having predetermined optical characteristics is formed on the bonding surface of each glass prism. Inoreta 124a, 124b force formed!
- the interference filter 124a reflects the blue light LB and transmits the red light LR and the green light LG.
- the interference filter 124b reflects the red light LR and transmits the green light LG and the blue light LB.
- the color lights LR, LG, LB modulated by the liquid crystal panels 122 R, 122 G, 122 B are synthesized and enter the projection optical system 125.
- the projection optical system 125 projects, for example, the image light incident from the dichroic prism 124 toward a projection surface such as a screen. A color image is projected on the screen.
- FIG. 3 is a diagram showing an arrangement of optical systems in the case where the optical axis of the liquid crystal projector according to the present embodiment is arranged in a straight line, and the light beam is not shown.
- the projection optical system 125 is configured to include a first lens group 1251, a second lens group 1252, and a third lens group 1253.
- the diaphragm device 200 is disposed on the light incident side of the second lens group 1252.
- FIG. 4 is a front view showing a configuration example of the diaphragm device according to the present embodiment at the time of opening.
- FIG. 5 is a front view showing a configuration example at the time of the maximum aperture (minimum aperture diameter) of the aperture device according to the present embodiment.
- 6A and 6B are views from the back side of the base of the diaphragm device according to the present embodiment.
- the stop device 200 of the present embodiment is disposed so as to partially overlap the plate-like base 201 having a substantially rectangular shape and having a predetermined thickness on the surface side of the base 201, and is arranged according to the rotation of the galvanometer.
- a circular stop opening 2011 is formed on one side in the longitudinal direction from the approximate center of the base 201.
- a galvanometer 300 is mounted on the other side of the back side of the base 201, and a substrate 400 is disposed on the top of the galvanometer 300.
- the substrate 400 is connected through lead wires to a control system circuit board (not shown) in which the Hall elements of the galvanometer 300, the braking coil, and the terminal portions of the driving coil are disposed at positions separated from the diaphragm device 200.
- Locking pins 2012, 2013, 2014, 2015 are formed on the surface 201a of the base 201 at the side portions in the longitudinal direction across the opening 2011 so as to slide the two diaphragm blades 0 2, 203.
- two arc-shaped rotation guide holes 2016, 2017 are formed in the base body 201. These two rotation guide holes 2016, 2017 guide the two rotation output shafts 301, 302 of the galvanometer 300 of the base 201, and restrict the rotation range of the rotation output shafts 301, 302 of the galvanometer 300 within a predetermined range.
- the guide hole is formed at a position facing approximately 180 degrees around the cylindrical axis of the cylindrical galvanometer 300.
- the aperture blade 202 is a straight, elongated hole-like locked hole 2021, which is formed along the longitudinal direction that the locking pin 2012, 2013 locks and regulates the sliding range with a predetermined length.
- the rotational output shaft 301 of the galvanometer 300 which is formed in a straight line so as to be substantially orthogonal to the guiding direction of the engaged holes 2021 and 2022 at one end side and at one end side 2022 and which passes through the rotational guide hole 2016 of the base 201
- a locking hole 2023 is formed for locking and guiding the end portion of the lock. As shown in FIGS.
- the output rotary shaft 301 is locked in the locked hole 2023 at one end, and locked in the locked hole 2021 at substantially the center from one end.
- the pin 2012 is locked, and the locking pin 2013 is locked in the locked hole 2022 together with the locked hole of the aperture blade 203.
- the diaphragm blade From one end to the central part of the diaphragm blade 202, as shown in FIGS. 4 and 5, the diaphragm blade is located on the right side of the diaphragm opening 2011 of the base 201 in FIG.
- An iris blade portion 202a is formed to extend along the peripheral edge of the diaphragm opening 2011 from the side portion side and extend to the left side of the diaphragm opening 2011 in the figure.
- a locking hole 2024 in which the locking pin 2015 is locked together with the locking hole of the diaphragm blade 203 in the longitudinal direction is provided in a portion of the diaphragm blade 202 positioned on the left side of the diaphragm opening 2011 in the drawing. Formed in a straight and elongated hole along the! .
- the iris blade portion 202 a is controlled so as to open and close approximately half of the aperture opening 2011 according to the rotation of the galvanometer 300.
- the aperture blade 203 is a linear, elongated hole-like locked hole 2031, which is formed along the longitudinal direction that the locking pin 2014, 2015 locks and regulates the sliding range with a predetermined length. 2032 And, at one end side, it is formed in a straight line so as to be substantially orthogonal to the guiding direction of the locking holes 2031 and 2032 and the rotation output shaft 302 of the galvanometer 300 which is passed through the rotation guiding hole 2017 of the base 201 A locking hole 2033 is formed to lock and guide the end. As shown in FIG. 4 and FIG.
- the output rotary shaft 302 is locked in the lock hole 2033 at one end, and the lock pin 2031 is locked in the lock hole 2031 from the one end to the substantially central part.
- the lock member 2015 is locked, and the lock pin 2015 is locked in the lock hole 2032 together with the lock hole 2024 of the diaphragm blade 202.
- the diaphragm 201 is located on the left side of the diaphragm opening 2011 in the drawing and branched from the central part.
- An iris blade portion 203a is formed along the peripheral edge portion of the side force stop aperture 2011 and extending to the right side portion of the stop aperture 2011 in the drawing.
- a locking hole 2034 in which the locking pin 2013 is locked together with the locking hole 2022 of the diaphragm blade 202 is long in a portion of the diaphragm blade 203 positioned on the right side in the drawing of the diaphragm opening 2011. It is formed in the shape of a straight and long hole along the direction.
- the iris blade portion 203 a is controlled so as to open and close approximately half of the aperture opening 2011 according to the rotation of the galvanometer 300.
- the diaphragm device 200 of the present embodiment is intended to improve serviceability as a mechanism that can be detached from the lens barrel portion of the projection optical system 125.
- mounting pieces 2018 and 2019 having screw insertion holes are formed so as to be detachable from the lens barrel by screws.
- a positioning notch 2020 is formed which can be inserted into the positioning portion in which the lens barrel portion is formed.
- All the diaphragm blades 202 and 203 and the locking pins 2012 to 2015 are formed of metal (SUS). In this case, it can be used continuously for 10 million times or more under high temperature conditions, for example, 140 ° C., and it is possible to form the throttling device 200 with excellent durability. Besides, it is also possible to form, for example, the diaphragm blades 202 and 203 of plastic (PET) and the locking pins 201-2015 (base 201) of metal such as aluminum. Also in this case, sufficient durability can be obtained.
- a metal such as SK material as the material of the diaphragm blades 202 and 203 and a metal such as aluminum as the pin material.
- the diaphragm blades 202 and 203 have a region where they overlap with each other.
- the aperture stop device 200 of the present embodiment is limited to about 80%, not 100%, of the light blocking ratio even in the fully closed state.
- the minimum throttling aperture diameter is determined on the assumption of system problems such as smoke due to abnormal temperature rise on the blade surface, with the uniformity within the target standard.
- the diaphragm region formed by the iris blade portion 202a of the diaphragm blade 202 and the iris blade portion 203a of the diaphragm blade 203 is formed into a substantially rectangular shape.
- a ghost may be easily developed by the rectangular opening.
- the iris blade portions 202a and 203a have predetermined R-shaped portions (as shown in FIGS. 7A and 7B). It is desirable that the small-aperture aperture formed by the mutually facing edges of the iris blade portions 202a and 202b have a so-called cat's eye shape. Since an edge portion where straight lines intersect as an aperture shape is not formed, it is possible to prevent the ghost from appearing around the projected image.
- the open aperture shape is substantially circular as shown in FIG. 7C.
- the iris blade portions 202a and 202b have a predetermined R shape to form the small aperture shape in a cat's eye shape, but it is preferable to form ghosts.
- the configuration for suppressing the occurrence is not limited to this. For example, as shown in FIG. 8A, FIG. 8B and FIG. By forming a wavy curve, the ghost can be sufficiently suppressed.
- FIG. 9 is a view showing an example of a mounting structure of the diaphragm apparatus 200 to the lens barrel portion in the present embodiment.
- the notch 2020 is inserted into the positioning portion 502 of the diaphragm mounting portion 501 of the lens barrel portion 500, and is positioned and screwed via the mounting pieces 2018 and 2019.
- the lens can be attached so that the substantially central portion of the diaphragm opening 2011 substantially coincides with the optical axis of the lens mirror unit 500.
- the diaphragm device 200 is oblique to the lens barrel portion 500, for example, approximately 45 degrees (or 135 degrees) so as to match the panel contrast characteristics and the shape of the cataract when the diaphragm is opened and closed. Place it diagonally so that it tilts to the lens barrel portion 500, for example, approximately 45 degrees (or 135 degrees) so as to match the panel contrast characteristics and the shape of the cataract when the diaphragm is opened and closed. Place it diagonally so that it tilts to the
- FIG. 10A is a view showing an illumination light angle distribution to the panel
- FIG. 10B is a view showing an illumination light (incident light) angle dependency of the panel contrast.
- the light intensity modulation element represented by the transmission type liquid crystal panel has different modulation characteristics (transmission characteristics in the case of transmission type liquid crystal) depending on the light input angle of the illumination beam to the element.
- BRT-W indicates the brightness when white is displayed, and this brightness BRT-W is proportional to the transmittance when white is displayed.
- BRT-B indicates the brightness when black is displayed, and this brightness BRT-B is proportional to the transmittance when black is displayed.
- the contrast ratio CNTR is shown in FIG. 10B as a value attached to the vertical axis on the right side.
- FIG. 10B A distribution of a circle showing the illumination light (incident light) angle dependency of the panel contrast in FIG. 10B is described with reference to FIGS. 11A to 11C for the angles of 0 degrees (360 degrees) to 330 degrees attached to the figure. Light up.
- the angle between the incident light IL and the normal to the surface V of the liquid crystal panel 122 (R, G, B) as a display element is ⁇
- the incident light IL to the panel surface 122a is Let ⁇ be the angle.
- FIG. 11B it is attached to the drawing as shown in FIG. 11C as an angle ⁇ in the same radial direction based on the coaxial direction of the angle ⁇ .
- the first MLA 104 of the illumination optical system 109 divides the illumination light L from the light source unit 101 into a plurality of beams and condenses them, and the light spot of each divided image is placed at a predetermined position Layout in the vicinity of the light entrance surface of the second MLA 105).
- the image of the light source unit 101 formed by focusing on the second MLA 105 is projected near the arrangement position of the stop device 200 of the projection optical system 125, that is, near the pupil position of the lens.
- the circle CRC in FIG. 10A serves as a control function of the aperture diameter, that is, the ray angle.
- the panel contrast characteristic shows the characteristic as shown in FIG. 10B, in the present embodiment, as shown in FIG. 12, the panel contrast characteristic is matched with the cataract shape at the time of opening and closing the aperture. As you arrange it.
- the contrast in the high contrast region is improved if the light beam angle is reduced. That is, as shown in FIG. 13, when the ray angle is small, the contrast is high and the brightness is low. On the other hand, when the ray angle is large, the contrast is low and the brightness is high. In order to obtain optimum characteristics.
- FIG. 14 is a diagram showing light incident angle characteristics of the liquid crystal panel.
- the region ARA surrounded by the broken line in FIG. 14 becomes the high contrast region and has the following features (definition of the following directions See Figure 11).
- Region ARA has an oval shape.
- the aperture shape satisfying these conditions is an oval shaped cat's eye as shown in FIG. It is a shape.
- a desired high contrast region in the light incident angle characteristic distribution of a liquid crystal panel using TN liquid crystal has an oval shape
- the major axis of the long circle is in an oblique direction with a predetermined angle with respect to the orthogonal axis of the two-dimensional distribution characteristic, and as described above, the diaphragm device 200 has two iris blade portions 202a and 203a.
- the aperture shape of the diaphragm formed by the opposing edges is an oval diaphragm shape (chasing eye shape), and the oval shape of the diaphragm is arranged to match the oval shape of the high contrast region of the liquid crystal panel.
- an area on the panel defined by the aperture of the diaphragm is taken, and the angular component of the predetermined incident light to the panel as shown in FIG. It is possible to simulate using as parameters the predetermined contrast values on so-called boundaries (isolines), which are indicated with respect to the angle of the incident light. It is possible to perform the verification shown below by this simulation.
- the stop shape of the cat's eye shown in FIG. 15 is the vertical arrangement type as shown in FIG. 16A, the diagonal arrangement type as shown in FIG. 16B, and the horizontal arrangement type as shown in FIG. 16C. Verified.
- the aperture shape pattern was superimposed on the contrast distribution, and the rate of increase in contrast due to the aperture was calculated.
- the aperture ratio AR is given by the following equation.
- BRT-C indicates the brightness when the aperture is closed
- BRT-O indicates the brightness when the aperture is opened.
- CNTR-C indicates the contrast ratio when the aperture is closed
- CNTR-O indicates the contrast ratio when the aperture is opened.
- FIG. 17 is a diagram showing this verification result.
- the contrast increase ratio of vertical alignment type (type) is 1.46
- the contrast increase ratio of oblique alignment type is 1.50
- the contrast increase ratio of horizontal alignment type is 1 It is 31.
- the contrast increase rate of the vertical arrangement type is 1.51
- the contrast increase ratio of the diagonal arrangement type is 1.60
- the contrast increase ratio of the horizontal arrangement type is 1.42.
- the contrast increase rate of the vertical arrangement type is 1. 89
- the contrast increase ratio of the diagonal arrangement type is 1.80
- the contrast increase ratio of the horizontal arrangement type is 1.75.
- the contrast increase ratio of the vertical arrangement type is 1. 93
- the contrast increase ratio of the oblique arrangement type is 1. 99
- the contrast increase ratio of the horizontal arrangement type is 1. 97.
- the contrast increase rate of the vertical arrangement type is 1.70
- the contrast increase ratio of the oblique arrangement type is 1.72
- the contrast increase ratio of the horizontal arrangement type is 1.61
- the present embodiment It is estimated that the contrast increase rate of the adopted diagonal arrangement type is the highest.
- the degree of contrast improvement can be maintained high by matching the aperture shape with the contrast characteristic of the element.
- the ability to maintain a high degree of contrast improvement contributes to the downsizing and the reduction of design changes.
- the aperture shape is an elongated circle inclined to the long side direction of the liquid crystal panel.
- the aperture may be decentered (offset) with respect to the optical axis of the projection lens, or may be adjusted according to the contrast characteristic of the element. Further optimization of the shape of the aperture from an oval is also included.
- a display panel that can greatly contribute to the improvement of contrast by disposing the diaphragm obliquely, for example, a liquid crystal panel using TN (twist nematic) liquid crystal whose twisting direction is horizontal or vertical is raised. be able to.
- TN ist nematic
- the output shafts 301 and 302 of the galvanometer 300 and the diaphragm blades 202 and 203 are connected in a locking relationship, and a control voltage for obtaining a predetermined diaphragm aperture is given to the galvanometer 300.
- the rotational force of the galvanometer output shaft 301, 302 is converted into a linear motion through the locked holes 2023, 203 of the diaphragm blade 202, 203, and the diaphragm blade 202, 203 slides, and at this time
- FIG. 18 is a circuit diagram showing an example of a galvanometer according to the present embodiment.
- This galvanometer 300 has, as shown in FIG. 18, a Hall element 310, a braking coil 311, a drive coil 312, operational amplifiers 313 to 315, resistance elements R301 to R319, and cannulas C301 to C305.
- Resistance elements R309 and R314 are variable resistance elements.
- a rotational position signal is output from the Hall element 310 installed inside the galvanometer 300, and the output shaft is stopped when it becomes balanced with the input control signal.
- the braking coil 311 acts as a pickup sensor for the drive coil 312, and for rapid changes, it constantly feeds back and acts as a brake to maintain an equilibrium state.
- initialization is performed by a control microcomputer (microcomputer) (not shown) provided on the projector side at power on. Do the action. The voltage at the open end and the close end is sampled by the output voltage of the hall element 310, and the absolute amount of the output voltage from the open end to the close end of the throttle device 200 is controlled. Store in the prepared memory.
- microcomputer microcomputer
- the relationship between the swing angle and the output voltage can position the absolute rotation angle of the output shaft at an arbitrary angle.
- the galvanometer 300 is capable of high-speed operation (approximately 50 to 70 ms from full opening to full closing) with very low operating noise and near silence.
- the diaphragm device 200 needs to position the diaphragm blades 202 and 203 at a target position with a predetermined speed and accuracy.
- stepping motors are widely used for iris type diaphragms because the control method is simple.
- annoying excitation noises during operation may be used. It is a source of noise and is unsuitable for use in home projectors requiring quietness because it emits
- the galvanometer 300 can suppress the machine noise by driving only by the connecting link without passing through the gear as the noise source.
- the current value flowing to the drive coil 312 and the braking coil 311 is optimized, the acceleration curve at start and stop is optimized, and control is performed so that the impact noise due to inertia and backlash at the time of acceleration / deceleration does not occur.
- the Hall element amplification system circuit in the circuit of FIG. 18 can be equivalently expressed as shown in FIG.
- This circuit is amplified by the differential amplifier circuit OP1 because there is an in-phase voltage of 1Z2 of the element voltage of the Hall element 310.
- Rh indicates the internal resistance of the Hall element 310.
- the Hall element amplification system circuit can adopt the configuration as shown in FIG.
- This circuit is configured to cancel the in-phase voltage of the Hall element 310 by the differential amplifier circuit OP2 and to amplify by the non-inverting amplifier circuit OP1.
- One output of the Hall element 310 is input to the inverting input (one) of the differential amplifier circuit OP2 as the first amplifying circuit, and the reference voltage Vref is supplied to the noninverting input (+).
- the other output of the Hall element 310 is input to the non-inverted input (+) of the amplifier circuit OP1 as the second amplifier circuit, and the reference voltage Vref is supplied to the inverted input ( ⁇ ).
- the gain A is given by the following equation.
- the circuit of FIG. 20 is not affected by the internal resistance Rh of the Hall element 301 because it is a non-inverting amplification circuit. Therefore, the variation in the Hall element output with good temperature characteristics is small. Then, by increasing the output of the Hall element 310, it is possible to receive the influence of noise.
- the galvanometer 300 for driving the diaphragm device 200 is a control system (not shown) in which the terminal portions of the Hall element 310, the braking coil 311 and the drive coil 312 are spaced apart from the diaphragm device 200. Since it is connected to the circuit board through the lead wire connected to the substrate 400 and tends to be easily affected by noise etc. at the lead wire part, the Hall element amplification system circuit is the circuit of FIG. Is better.
- the aperture stop device 200 of the present embodiment dynamically changes the aperture diameter of the aperture stop according to the APL (average picture level) fluctuation.
- the projector's control system consists of three types: aperture on (ON) Z off (off) and Z automatic (AUTO) Setting mode.
- the light blocking rate is 0% when the stop is fully open, the light blocking rate is 50% when the stop is ON, and the light blocking rate is 0-80% when the stop AUTO.
- At least one frame is stored in the frame buffer and then output from the panel driver in order to convert the input signal format to the screen size, video signal timing, resolution, etc. appropriate for the output format.
- the microcomputer for controlling the aperture device takes in APL information indicating the average brightness level of the image data contained in one frame before output, and recognizes the value.
- DA digital analog
- This control signal optimized from the APL information is applied to the diaphragm drive circuit in synchronization with the image signal output to the liquid crystal panel to obtain the optimum diaphragm opening.
- the signal levels for driving the liquid crystal panels 122R, 122G and 122B are controlled together with the aperture of the aperture based on the APL information of the video signal.
- the aperture of the diaphragm is reduced to restrict the light output, and conversely, the signal level for driving the liquid crystal panels 122R, 122G, and 122B is increased to set a predetermined gradation level.
- the dynamic range that can be displayed by the liquid crystal panels 122R, 122G, and 122B can be widely used, and excellent gradation expression can be performed even in a dark image. Further, by narrowing the aperture to a small size, the luminous flux angle incident on the liquid crystal panels 122R, 122G, and 122B is reduced, the incident angle characteristic (viewing angle dependency) is improved, and the contrast ratio is improved.
- the microcomputer for controlling the iris compares the APL fluctuation of the front and back frames and recognizes the difference.
- the control signal is multiplied by a factor of 1 or less to drive the iris device to suppress a sudden change of the iris aperture.
- the viewer's eyes are insensitive to sudden changes in brightness at the absolute value of the brightness. For example, when moving from a dark place to a bright place in general, it takes about 40 seconds to get used to the ambient brightness.
- coefficients are determined so that the viewer does not feel uncomfortable, and various parameters related to the drive of the diaphragm are determined.
- FIG. 21 is a view showing a cooling structure for the aperture device of the liquid crystal projector 100 according to the present embodiment.
- the liquid crystal projector 100 is provided with a lamp ballast and a sirocco fan dedicated to cooling the throttling device, a prism and a sirocco fan dedicated to cooling the throttling device, a vent for prism cooling, etc. as a cooling structure.
- a part of the wind of the prism cooling duct is connected to the diaphragm cooling duct 600 via the hole of the main plate sealed with internal air, and the diaphragm blades 202 and 203 in the projection optical system 125 are connected. Forced cooling.
- a hole 125a of the projection optical system 125 is formed, and a wind of the inside air is sent through a duct 600.
- a wind escape hole is also formed on the diagonal side of the formation position of the hole 125a.
- the wind is circulated via the internal air circulation duct side power diaphragm cooling duct.
- the projection lens is not affected by dust because it uses the wind of shyness. Further, since it is not necessary to provide a dedicated fan, cost can be reduced and the shape can be minimized.
- the conventional illumination optical system Since the polarization efficiency can be improved without changing the optical design of the optical system, the image contrast projected on the screen can be greatly improved.
- the increase in the occupied volume of the projection optical system due to the installation of the aperture stop 200 is only in the vicinity of the aperture stop mounting portion, and a significant improvement in performance can be achieved without impairing the commercial property.
- the expansion device 200 has a structure for forcibly cooling the drive actuator, and has a structure for forcibly cooling the blades of the expansion device and the peripheral portion thereof, parts such as the drive actuator are affected by high heat. Malfunction can be prevented. Industrial applicability
- the projection type display device of the present invention can suppress an increase in the outer size of the set, etc., can improve the contrast, and is excellent in quietness, so that it can be applied as a projector. Etc. are applicable.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Projection Apparatus (AREA)
- Liquid Crystal (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007509792A JPWO2006137416A1 (ja) | 2005-06-21 | 2006-06-20 | 投射型表示装置 |
US11/660,591 US20070263179A1 (en) | 2005-06-21 | 2006-06-20 | Projection Type Display Unit |
EP06767015A EP1895361A1 (en) | 2005-06-21 | 2006-06-20 | Projection type display unit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2005181165 | 2005-06-21 | ||
JP2005-181165 | 2005-06-21 |
Publications (1)
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WO2006137416A1 true WO2006137416A1 (ja) | 2006-12-28 |
Family
ID=37570445
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/312356 WO2006137416A1 (ja) | 2005-06-21 | 2006-06-20 | 投射型表示装置 |
Country Status (7)
Country | Link |
---|---|
US (1) | US20070263179A1 (ja) |
EP (1) | EP1895361A1 (ja) |
JP (1) | JPWO2006137416A1 (ja) |
KR (1) | KR20080015064A (ja) |
CN (1) | CN101010629A (ja) |
TW (1) | TW200712743A (ja) |
WO (1) | WO2006137416A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010066419A (ja) * | 2008-09-10 | 2010-03-25 | Sanyo Electric Co Ltd | 開閉扉付き電子機器 |
CN102985874A (zh) * | 2010-08-23 | 2013-03-20 | 三菱电机株式会社 | 投影式显示装置 |
JP2014209185A (ja) * | 2013-03-29 | 2014-11-06 | セイコーエプソン株式会社 | プロジェクター、照明装置 |
JP2015528124A (ja) * | 2012-07-01 | 2015-09-24 | バルコ・ナムローゼ・フエンノートシャップ | 投射器光学素子 |
US9361819B2 (en) | 2013-07-19 | 2016-06-07 | Seiko Epson Corporation | Image display device and method of controlling the same |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5002228B2 (ja) * | 2006-10-03 | 2012-08-15 | キヤノン株式会社 | 画像表示装置 |
JP4501962B2 (ja) * | 2007-05-21 | 2010-07-14 | セイコーエプソン株式会社 | 画像表示装置 |
US8960923B2 (en) | 2009-09-16 | 2015-02-24 | Nec Display Solutions, Ltd. | Projection type display device and method including vibration of component of illumination optical system |
JP5316510B2 (ja) | 2010-10-26 | 2013-10-16 | 株式会社Jvcケンウッド | 投射型表示装置 |
US10097800B2 (en) | 2015-05-11 | 2018-10-09 | Reald Inc. | Optical lens systems with dynamic iris for modulating image frames |
EP3710872A1 (en) * | 2017-11-14 | 2020-09-23 | Imax Theatres International Limited | Light conditioning of direct view display for cinema |
JP7052784B2 (ja) * | 2019-09-30 | 2022-04-12 | セイコーエプソン株式会社 | 光学デバイス、プロジェクター、及び光学デバイスの制御方法 |
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- 2006-06-20 EP EP06767015A patent/EP1895361A1/en not_active Withdrawn
- 2006-06-20 KR KR1020077003656A patent/KR20080015064A/ko not_active Application Discontinuation
- 2006-06-20 JP JP2007509792A patent/JPWO2006137416A1/ja active Pending
- 2006-06-20 WO PCT/JP2006/312356 patent/WO2006137416A1/ja active Application Filing
- 2006-06-20 CN CNA2006800006923A patent/CN101010629A/zh active Pending
- 2006-06-21 TW TW095122285A patent/TW200712743A/zh unknown
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CN102985874A (zh) * | 2010-08-23 | 2013-03-20 | 三菱电机株式会社 | 投影式显示装置 |
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JP2014209185A (ja) * | 2013-03-29 | 2014-11-06 | セイコーエプソン株式会社 | プロジェクター、照明装置 |
US9361819B2 (en) | 2013-07-19 | 2016-06-07 | Seiko Epson Corporation | Image display device and method of controlling the same |
Also Published As
Publication number | Publication date |
---|---|
KR20080015064A (ko) | 2008-02-18 |
JPWO2006137416A1 (ja) | 2009-01-22 |
TW200712743A (en) | 2007-04-01 |
EP1895361A1 (en) | 2008-03-05 |
US20070263179A1 (en) | 2007-11-15 |
CN101010629A (zh) | 2007-08-01 |
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