Source: http://www.google.com/patents/US20040095767?dq=6,163,776
Timestamp: 2017-08-22 20:56:41
Document Index: 341404523

Matched Legal Cases: ['art 37', 'art 73', 'art 73', 'art 103', 'art 103', 'art 203', 'art 203', 'art 213']

Patent US20040095767 - Color wheel assembly and color sequential display device using the same - Google Patents
A field sequential color display device includes a color wheel assembly. The color wheel assembly has a color wheel which is divided into a plurality of color regions and a motor for rotating the color wheel. The motor contains a sensor for detecting rotation of the motor and the sensor outputs at least...http://www.google.com/patents/US20040095767?utm_source=gb-gplus-sharePatent US20040095767 - Color wheel assembly and color sequential display device using the same
Publication number US20040095767 A1
Also published as US6755554, US7004604, US20020003704
Publication number 10706007, 706007, US 2004/0095767 A1, US 2004/095767 A1, US 20040095767 A1, US 20040095767A1, US 2004095767 A1, US 2004095767A1, US-A1-20040095767, US-A1-2004095767, US2004/0095767A1, US2004/095767A1, US20040095767 A1, US20040095767A1, US2004095767 A1, US2004095767A1
Original Assignee Hideki Ohmae, Mitsuhiro Wada, Kazunori Tanabe, Shigeru Aruga, Hirokazu Sakaguchi, Hisatoshi Shimose
Patent Citations (25), Referenced by (73), Classifications (21), Legal Events (2)
Color wheel assembly and color sequential display device using the same
US 20040095767 A1
This application is a divisional of Ser. No. 09/864,333, filed May 25, 2001.
The LCOS is one of the SLMs, and it has reflection pixels in a form of matrix, and can switch displays at a high speed using a video signal. In order to display moving pictures at a video rate, it is necessary that video of 60 frames can be displayed within one field. For that purpose, the liquid crystal response speed of at least {fraction (1/60)}=16.7 msec or lower is required. Further, in order to display at least three colors (RGB) during that time, a response speed of 5.6 msec is required. As examples of such a high-speed response liquid crystal, there are a ferroelectric liquid crystal, an antiferroelectric liquid crystals, an OCB (optically Compensated Bend) liquid crystal and the like. in the OCR liquid crystal, a Bend orientation cell is used to self-compensate changes in the visibility angle direction using birefringence of the liquid crystal, and when this liquid crystal is combined with a negative optical compensation film, a wider visibility angle is realized, as well as a high-speed response is enabled.
The operation of the so-constructed prior art field sequential color display device is described. The lamp 1001 is positioned approximately in a focus position of the ellipsoidal mirror 1002 as a concave mirror, so that the emitted white light beams are condensed by the ellipsoidal mirror 1002 on the color filter of the color wheel 1004. The UV-IR cut-off filter 1003 filters out ultraviolet and infrared rays of the light emitted from the lamp 1001. The color wheel 1004 comprises red, blue, and green color filters which are positioned in the form of a disk and, in synchronization with the filtering of beams by the respective color filters, the LCOS 1007 displays image frames of the beam color. Normally, the color wheel 1004 is rotated one revolution per image frame in {fraction (1/60)} sec, or at 3600 rpm. The condensing lens 1005 efficiently condenses light which is transmitted through the color wheel 1004, and irradiates the LCOS 1007. The field lens 1006 is used for condensing light which is transmitted through the LCOS 1007 on the projection lens 1008.
In this prior art field sequential color display device, there are at least three color sub-frames during one frame frequency, the sub-frames being red, green and blue, respectively. The LCOS 1007 switches display images at a considerably high speed for the respective colors, and modulated beams of respective colors are enlargedly projected on a screen (not shown) by using the projection lens 1008. Since videos of the respective colors (R, G and B) are successively projected and displayed on the screen in {fraction (1/60)} sec, these videos are perceived by the eyes as after-images, whereby full-color videos are recognized.
[0026]FIG. 38 is a diagram for explaining the relationship between the color wheel 1004 and the condensation spot 1009. Hereinafter, the problems of the prior art field sequential color display device are described with reference to FIG. 38.
[0084]FIG. 1 is a diagram schematically illustrating an example of a color wheel assembly according to a first embodiment of the present invention.
[0085]FIG. 2 is a cross-sectional view illustrating the color wheel assembly according to the first embodiment.
[0086]FIG. 3 is a diagram schematically illustrating an example of a color wheel assembly according to a second embodiment of the present invention.
[0087]FIG. 4 is a diagram schematically illustrating an example of a color wheel assembly according to a third embodiment of the present invention.
[0088]FIG. 5 is a diagram schematically illustrating an example of a color wheel assembly according to a fourth embodiment of the present invention.
[0089]FIG. 6 is a block diagram illustrating a structure if a field sequential color display device using a color wheel according to a fifth embodiment of the present invention.
[0090]FIG. 7 is a diagram schematically illustrating an example of a color wheel unit according to a sixth embodiment of the present invention.
[0091]FIG. 8 is a cross-sectional view illustrating an example of a color wheel unit according to a seventh embodiment of the present invention.
[0092]FIG. 9 is an exploded view illustrating an example of a color wheel unit according to an eighth embodiment of the present invention.
[0093]FIG. 10 is a diagram schematically illustrating an example of a color wheel unit according to a ninth embodiment of the present invention.
[0094]FIG. 11 is a cross-sectional view illustrating an example of a color wheel unit according to a tenth embodiment of the present invention.
[0095]FIG. 12 is a cross-sectional view illustrating an example of a color wheel unit according to an eleventh embodiment of the present invention.
[0096]FIG. 13 is a cross-sectional view illustrating an example of a color wheel unit according to a twelfth embodiment of the present invention.
[0097]FIG. 14 is a cross-sectional view illustrating an example of a color wheel unit according to a thirteenth embodiment of the present invention.
[0098]FIG. 15 is a diagram schematically illustrating an example of a color wheel unit according to a fourteenth embodiment of the present invention.
[0099]FIG. 16 is a diagram schematically illustrating an example of a color wheel unit according to a fifteenth embodiment of the present invention.
[0100]FIG. 17 is a diagram schematically illustrating an example of a color wheel unit according to a sixteenth embodiment of the present invention.
[0101]FIG. 18 is a diagram schematically illustrating an example of a color wheel according to a seventeenth embodiment of the present invention.
[0102]FIG. 19 is a schematic diagram and a cross-sectional view illustrating an example of a color wheel according to an eighteenth embodiment of the present invention.
[0103]FIG. 20 is a cross-sectional view illustrating an example of a color wheel according to a nineteenth embodiment of the present invention.
[0104]FIG. 21 is a diagram schematically illustrating an example of a color wheel according to a twentieth embodiment of the present invention.
[0105]FIG. 22 is a diagram illustrating a structure of a field sequential color display device according to a twenty-first embodiment of the present invention.
[0106]FIG. 23 is a diagram illustrating a structure of a field sequential color display device according to a twenty-second embodiment of the present invention.
[0107]FIG. 24 is a diagram illustrating a structure of a field sequential color display device according to a twenty-third embodiment of the present invention.
[0108]FIG. 25 is a front view illustrating a color wheel in FIG. 24.
[0109]FIG. 26 is a diagram for explaining the relationship between a color wheel and a condensation spot, seen from the light incident side according to the twenty-third embodiment.
[0110]FIG. 27 is a diagram for explaining the relationship between the color wheel and the condensation spot, seen from the light incident side according to the twenty-third embodiment.
[0111]FIG. 28 is a diagram for explaining the relationship among the color wheel, the condensation spot and a flare diaphragm, seen from the light radiating side according to the twenty-third embodiment.
[0112]FIG. 29 is a diagram for explaining the relationship among the color wheel, the condensation spot and the flare diaphragm, seen from the light radiating side according to the twenty-third embodiment.
[0113]FIG. 30 is a diagram illustrating a structure of a field sequential color display device according to a twenty-fourth embodiment of the present invention.
[0114]FIG. 31 is a front view illustrating a flare diaphragm in FIG. 30.
[0115]FIG. 32 is a diagram illustrating a structure of a field sequential color display device according to a twenty-fifth embodiment of the present invention.
[0116]FIG. 33 is an exploded perspective view illustrating a color wheel unit in FIG. 32.
[0117]FIG. 34 is a diagram illustrating a structure of a field sequential color display device according to a twenty-sixth embodiment of the present invention.
[0118]FIG. 35 is a front view illustrating a flare diaphragm in FIG. 34.
[0119]FIG. 36 is a diagram illustrating a structure of a prior art field sequential color display device.
[0120]FIG. 37 is a diagram for explaining a prior art color wheel assembly.
[0121]FIG. 38 is a diagram for explaining the relationship between a color wheel and a condensation spot in the prior art field sequential color display device.
[0123]FIG. 1 is a diagram schematically illustrating an example of the color wheel assembly of the first embodiment. As shown in FIG. 1, the color wheel assembly of the first embodiment is constituted by a color wheel 1 and a motor 2.
[0129]FIG. 2 is a cross-sectional view illustrating an example of the color wheel assembly according to the first embodiment. The description is given taking a case where the motor 2 is an outer-rotor-shaped brushless DC motor as an example.
[0141]FIG. 3 is a diagram schematically illustrating an example of the color wheel assembly of the second embodiment. The color wheel assembly of the second embodiment is different from the color wheel assembly of the aforementioned first embodiment only in that it positions a color wheel and a motor. The same reference numerals as those in the first embodiment denote the same or corresponding elements.
The positioning of the color wheel 31 and the motor 32 is carried out by aligning the positioning hole 36 which is provided at the periphery of the opening at the center of the hub 34 of the color wheel 31, connected with the motor 32, and the positioning hole 38 which is provided at the rotor part 37 of the motor 32, and then press-fitting a pin 39 in the holes to tix the color wheel and the motor. It is more desirable that the color wheel 31 and the motor 32 are thereafter fixed further using a damper or the like.
[0147]FIG. 4 is a diagram schematically illustrating an example of the color wheel assembly of the third embodiment. The color wheel assembly of the third embodiment is different from the color wheel assembly of the first embodiment only in that it positions a color wheel and a motor. The same reference numerals as those in the first embodiment denote the same or corresponding elements.
The positioning of the color wheel 41 and the motor 42 is carried out by aligning the keyway 46 which is provided at the periphery of the opening at the center of the hub 44 of the color wheel 41, connected with the motor 42, with the keyway 48 which is provided at the rotor part of the motor 42, and press-fitting a key 49 in the keyways 46 and 48 to fix the color wheel 41 and the motor 42. It is more desirable that the color wheel 41 and the motor 42 are thereafter further fixed using a damper or the like.
[0154]FIG. 5 is a diagram schematically illustrating an example of the color wheel assembly of the fourth embodiment. The color wheel assembly of the fourth embodiment is different from the color wheel assembly of the first embodiment only in that it can shift a phase of a pulse signal which is mechanically output from the motor after the positioning of the color wheel and the motor, slightly forward or backward. The same reference numerals as those in the first embodiment denote the same or corresponding elements.
[0159]FIG. 6 is a block diagram illustrating a structure of the field sequential color display device of the fifth embodiment.
White light emitted from a lamp such as a discharging-type high output lamp, for example, a xenon lamp, a metal halide lamp, or an extra-high pressure mercury lamp, which is positioned to condense light beams on the color wheel of the color wheel assembly 65 is sent to the SLM 64 through the color wheel of the color wheel assembly 65. The color wheel assembly 65 has a color wheel comprising red, blue and green color filters which are arranged in the form of a disk, and in synchronization with filtering of a light beam by each of the filters, the SLM 64 displays an image frame of the color of the beam. Normally, the color wheel of the color wheel assembly 65 is rotated by the motor one revolution per image frame in {fraction (1/60)} sec, or at 3600 rpm. In this field sequential color display device, there are six sub-frames during one frame frequency, the respective being red, green, blue, red, green, and blue. The SLM 64 switches display images for the respective colors at a considerably high speed, and modulated respective color beams are enlargedly displayed on a screen using a projection lens. Videos of the respective colors R, G, B, R, G and B are successively displayed on the screen in {fraction (1/60)} sec, so that these videos are perceived by the eyes as after-images, whereby full-color videos are recognized.
Since the field sequential color display device can obtain a position detection signal stably also at highspeed rotation or at elevated temperatures, the process of synchronizing the color of the color filter on the color wheel with the video which is displayed by the SLM can be carried out accurately even at high-speed rotation or at elevated temperatures.
[0180]FIG. 7 is a diagram schematically illustrating the color wheel unit of the sixth embodiment. This color wheel unit is constituted mainly by a color wheel case lid 71, a color wheel case body 72, a color wheel (not shown), and a motor (not shown). A radiating fin part 73 and a light incident opening 74 are formed on the color wheel case lid 71. In order to simply describe the internal structure, a cross-sectional view of the color wheel unit according to the sixth embodiment is given in FIG. 8. Here, a color wheel assembly which is constituted by a color wheel 81 and a motor 82 for rotating the color wheel is the color wheel assembly described in any of the aforementioned first to fourth embodiments. The motor 82 is fixed to the color wheel case body 72, and the color wheel 81 is housed by the color wheel lid 71. As apparent from the cross-sectional view, the radiating fin part 73 is integrated with the color wheel case lid 71, and has plural narrow gather-shaped projections and depressions formed to efficiently dissipate heat which is conducted to the color wheel case, into the air.
[0181]FIG. 9 is an exploded view schematically illustrating the color wheel unit, with the color wheel care lid 71 being removed. The color wheel comprises green (G), red (R) and blue (B) color filters 91, 92 and 93, which are sandwiched and fixed by two hubs 94 on opposing sides. Each of the color filters 91, 92 and 93 is a glass pane of 1-mm thickness, and the outside shape thereof is processed in an approximately fan shape having a 60-degree interior angle. The color filters 91, 92 and 93 each are a dichroic filter comprising a glass pane whose surface is coated by an optical thin film so that transmitted white light is modulated into light of the respective color R, G or B, and two filters for each color, i.e., six filters in total, are prepared. Each of the hubs 94 is made of aluminum, has a disk shape, has an opening at its center, and the hubs 94 are joined by a rotor of the motor and a damper 95. The color filters 91, 92 and 93 are fixed by the hubs 94 in this way. Initially, the color filters 91, 92 and 93 are positioned on the hub so that the same color filters face each other across the center. Then, the other hub 94 is put on the color filters 91, 92 and 93, and fixed to the hub 94 with an adhesive or screws, whereby the color filters 91, 92 and 93 are sandwiched by the hubs 94.
[0189]FIG. 10 is a diagram schematically illustrating the color wheel unit of the seventh embodiment. As shown in FIG. 10, a radiating fin part 103 and a light incident opening 104 are formed on a color wheel case lid 101. Though not shown, a color wheel and a motor are fixed to a color wheel case body 102, and housed in the case. The radiating fin part of the color wheel unit according to the sixth embodiment is the one having plural gather-shaped projections and depressions, while the radiating fin part 103 of the seventh embodiment has plural columnar projections and depressions formed as shown in FIG. 10, thereby having higher heat radiation effects.
In a case where the transparent plate 165 shown in FIG. 16 is a glass pane, reflection of light occurs on an interface between air and glass, resulting in about a 4% lost of light. Since one glass pane has two interfaces, this results in about 15% reduction in the brightness in total, summing up reductions on the light incident side and the light radiating side. In this embodiment, the loss in the brightness can be controlled to about 2% or less, by covering both sides of the transparent plate 165 on which light is incident, with a reflection-inhibiting coating. Since the beams entering into or emerging from the transparent plate 165 are white light beams, it is preferable that the reflection-inhibiting coating is a multi-coating comprising plural laminated optical thin films which are obtained by evaporating a metal oxide. This certainly holds true for a transparent plate which is used for the light radiating opening (not shown).
Hereinafter, a color wheel unit according to the seventeenth embodiment of the present invention will be described with reference to FIG. 20. FIG. 20 is a cross-sectional view illustrating the color wheel unit of the seventeenth embodiment. As shown in FIG. 20, a radiating fin part 203 is formed on a color wheel case lid 210. A color wheel 205 and a motor 206 are fixed to the color wheel case body 202, and housed in the case. A cushioning material 204 is put between joint surfaces of the color wheel case body 202 and the motor 206, and fixed so that the color wheel case body 202 is kept from direct contact with the motor 206 as well as to ensure that no crevice is formed therebetween. Thereby, an increased sealing of the color wheel case can be obtained, and even when light which has been absorbed by the color wheel case lid 201 and the color wheel case body 202 is converted into heat, this heat is hardly conducted to the motor 206 because the thermal conductivity of rubber or resin as the cushioning material is lower than that of metal. Therefore, the conduction of heat to the motor or color wheel can be suppressed, thereby increasing the reliability. In addition, by forming the radiating fin part 203 on the outer surface of the color wheel case lid 201, the heat in the case can be dissipated more effectively, thereby cooling the inside of the case. Further, since the cushioning material 204 absorbs vibrations resulting from the rotations of the color wheel and the motor, noises caused by vibrations at the junction between the motor 206 and the color wheel case body 202 can be reduced.
A color wheel unit according to the eighteenth embodiment of the present invention will be described with reference to FIG. 21. FIG. 21 is a diagram schematically illustrating the color wheel unit of the eighteenth embodiment. As shown in FIG. 21, a radiating fin part 213 is formed on a color wheel case lid 211. A color wheel and a motor are fixed to a color wheel case body 212, and housed in the case. Two fixing parts for fixing the color wheel unit to an optical chassis 216 are provided on the color wheel case. A cushioning material 215 is inserted at the fixing parts, and the color wheel unit is fixed to the optical chassis 216, while being kept from direct contact therewith. The cushioning material 215 is made of a vibration-isolating rubber damper. Thereby, vibrations resulting from the rotations of the color wheel and the motor are absorbed or intercepted by the cushioning material 215, whereby noises caused by the vibrations at the junction between the color wheel unit and the optical chassis are reduced, and the vibrations of the color wheel unit are not conducted to the optical chassis. Further, when the color wheel unit can be easily removed from the optical chassis 216 like in this embodiment, the color wheel unit can be immediately replaced and the maintenance can be easily performed if the color wheel should be broken or the motor should fail.
The operation of the so-constructed field sequential color display device is described. A 250 W extra-high pressure mercury lamp is used as the lamp 223. The lamp 223 is positioned approximately in a focus point of a concave mirror, and white light beams emitted from the lamp are condensed by the elliptical concave mirror on the color filter of the color wheel. In this lamp, the luminance of the emission part is high, and emitted light beams can be efficiently condensed. Further, this lamp has good color rendering properties, and this is suitable for full-color displays. The color wheel comprises green, red, and blue color filters, which are positioned in the form of a disk. In synchronization with filtering of a beam by each filter, the LCOS 222 displays an image frame of the color of the beam. In the field sequential color display device according to the nineteenth embodiment, the color wheel is rotated by the motor two revolutions per image frame in {fraction (1/60)} sec, or at 7200 rpm. In this field sequential color display device, there are twelve color sub-frames during one frame frequency, the respective being green, red, blue, green, red, blue, green, red, blue, green, red, and blue. The LCOS 222 switches the display images for the respective colors at a considerably high speed, and modulated beams of respective colors are enlargedly projected on the screen 225 using the projection lens 224. Since videos of the respective colors G, R, B, G, R, B, G, R, B, G, R, and B are successively displayed on the screen in {fraction (1/60)} sec, these videos are perceived by the eyes being integrated as after-images, whereby full-color videos are recognized.
The operation of the so-constructed field sequential color display device is described. A 150 W extra-high pressure mercury lamp is used as the lamp 233. The lamp 233 is positioned approximately in a focus point of a concave mirror 238, so that white light beams which are emitted from the lamp are condensed on the color filter of the color wheel by the elliptical concave mirror 238. The color wheel is constituted by green, red, and blue color filters, which are positioned in the form of a disk. In synchronization with filtering of the beam by each filter, the DMD 232 displays an image frame of the color of the beam. In the field sequential color display device according to the twentieth embodiment, the color wheel is rotated by a motor three revolutions per image frame in {fraction (1/60)} sec or at 10800 rpm. In this field sequential color display device, there are 18 sub-frames during one frame frequency, the respective being green, red, blue, green, red, blue, green, red, blue, green, red, blue, green, red, blue, green, red, and blue. The DMD 232 switches display images for the respective colors at a considerably high speed, and modulated beams of respective colors are enlargedly projected on the screen using the projection lens 234. Since videos of the respective colors G, R, B, G, R, B, G, R, B, G, R, B, G, R, B, G, R and B are successively displayed on the screen in {fraction (1/60)} sec, these videos are perceived by the eyes as being integrated as after-images, whereby full-color videos are recognized. The beams which have been subjected to the color separation by the color wheel are made to be parallel beams by the field lens 237, and illuminate the DMD 232 obliquely with the mirror 239. In this field sequential color display device, the direction of the reflected beam is controlled according to the inclination of the mirror with respect to the DMD 232, and it is previously designed so that the beam is incident on the projection lens 234 when it is ON.
[0222]FIG. 24 is a diagram illustrating a structure of the field sequential color display device of the twenty-first embodiment.
The rotation controller 248 receives a video signal of each of the colors red, green and blue, and drives the rotating motor 247 in accordance with a synchronous signal included in the video signal, so that light having a band of each color is transmitted through the color wheel 246 in synchronization with the display of the LCD PANEL 251 of each of the colors red, blue and green. Here, to control the rotation of the color wheel 248, the position detection is required, and the rotation controller 248 detects the rotation speed and position of the color wheel on the basis of a pulse signal which is output from the rotating motor 247.
[0238]FIG. 26 is a diagram for complementarily explaining the relationship between the color wheel 246 and the condensation spot 245 seen from the incidence side of the color wheel 246, and the black display period of the LCD PANEL 251 is described with reference to this figure. FIG. 26 shows an initial state of usage of the lamp 241.
[0248]FIG. 28 is a diagram for explaining the relationship among the color wheel 246, the condensation spot 245 and the flare diaphragm 244, seen from the radiation side of the color wheel 246, and shows a initial state of use of the lamp 241.
[0257]FIG. 30 is a diagram illustrating a structure of the field sequential color display device of the twenty-second embodiment. In this figure, the same reference numerals as those in FIG. 24 denote the same or corresponding parts. FIG. 31 is a front view illustrating a flare diaphragm 301 in FIG. 30.
[0266]FIG. 32 is a diagram illustrating a structure of the field sequential color display device of the twenty-third embodiment. In this figure, the same reference numerals as those in FIG. 30 denote the same or corresponding parts, and a color wheel unit 321 is included. FIG. 33 is an exploded perspective view illustrating the color wheel unit in FIG. 32.
In this case, the air gap between the color wheel 331 and the flare diaphragm 336 when the color wheel 331, the motor 333, and the color wheel cases 334 and 335 are fixed to each other is set for example at 2 mm. It is more preferable that the air gap between the color wheel 331 and the flare diaphragm 336 is as small as possible, and when this is set at 5 mm or smaller, the shading effects can he efficiently obtained.
According to the so-constructed field sequential color display device, by sealing and retaining the color wheel 331 in the color wheel cases 334 and 335 with the dare diaphragm 336, the color mixture of the image of the LCD PANEL 251 can be prevented, and the safe performance can be improved. Further, when the protrusion of the flare diaphragm 336 in the color wheel cases 334 and 335 has a shape having a relatively small air resistance, the noises can be reduced. Besides, when the air gap between the color wheel 331 and the flare diaphragm 336 is 5 mm or smaller, the shading effects can be efficiently obtained.
[0278]FIG. 34 is a diagram illustrating a structure of the field sequential color display device of the twenty-fourth embodiment. In this figure, the same reference numerals as those of FIG. 24 denote the same or corresponding parts, and a flare diaphragm 341 is included. FIG. 35 is a front view illustrating the flare diaphragm 341 in FIG. 34.
US5779353 * Apr 16, 1996 Jul 14, 1998 Fiberstars, Inc. Weather-protected lighting apparatus and method
US7187509 Feb 6, 2006 Mar 6, 2007 Minebea Co., Ltd. Color wheel and manufacturing method of same
US7218464 * Feb 10, 2005 May 15, 2007 Prodisc Technology Inc. Aligning-assembling method for color wheel
US7434946 * Jun 17, 2005 Oct 14, 2008 Texas Instruments Incorporated Illumination system with integrated heat dissipation device for use in display systems employing spatial light modulators
US7443621 * Nov 3, 2006 Oct 28, 2008 Oc Oerlikon Ag Balancing method for color wheel
US7675661 May 18, 2006 Mar 9, 2010 Seiko Epson Corporation Printing based on motion picture
US7959298 * May 25, 2007 Jun 14, 2011 Panasonic Corporation Projection type display apparatus
US8152303 * Dec 21, 2005 Apr 10, 2012 International Business Machines Corporation Signal synthesizer for periodic acceleration and deceleration of rotating optical devices
US8264525 * Aug 30, 2006 Sep 11, 2012 International Business Machines Corporation Closed loop feedback control to maximize stereo separation in 3D imaging systems
US8636378 * Nov 5, 2012 Jan 28, 2014 Xicato, Inc. Illumination device with light emitting diodes and movable light adjustment member
US9069162 * Nov 19, 2010 Jun 30, 2015 Appotronics Corporation Limited Lighting device, method and light wavelength conversion wheel assembly for color tuning thereof
US9423676 * Jun 12, 2014 Aug 23, 2016 Ricoh Company, Ltd. Lighting unit and image projector
US20050147900 * Feb 10, 2005 Jul 7, 2005 Prodisc Technology Inc. Aligning-assembling method for color wheel
US20070211180 * Jan 25, 2005 Sep 13, 2007 Samsung Electronics Co., Ltd. Optical Engine Apparatus And Projection Television Using The Same
US20070236816 * Nov 3, 2006 Oct 11, 2007 Oc Oerlikon Balzers Ag Balancing method for color wheel
US20080278694 * Sep 29, 2007 Nov 13, 2008 Coretronic Corporation Color wheel module and projection apparatus using the same
US20090244494 * May 25, 2007 Oct 1, 2009 Panasonic Corporation Projection type display apparatus
US20090310090 * Aug 28, 2008 Dec 17, 2009 Hon Hai Precision Industry Co., Ltd. Color wheel and projector having same
US20120230013 * Nov 19, 2010 Sep 13, 2012 Appotronics Corporation Limited Lighting device, method and light wavelength conversion wheel assembly for color tuning thereof
US20130058081 * Nov 5, 2012 Mar 7, 2013 Xicato, Inc. Illumination device with light emitting diodes and movable light adjustment member
US20140375964 * Jun 12, 2014 Dec 25, 2014 Satoshi Tsuchiya Lighting unit and image projector
US20150054919 * Mar 7, 2014 Feb 26, 2015 SK Hynix Inc. Three-dimensional image sensor module and method of generating three-dimensional image using the same
CN102365493A * Mar 18, 2010 Feb 29, 2012 皇家飞利浦电子股份有限公司 Gobo projector and moving head
CN102588764A * Sep 7, 2011 Jul 18, 2012 百奇股份有限公司 Stage light
CN104075144A * Mar 27, 2013 Oct 1, 2014 深圳市海洋王照明工程有限公司 Lighting device adjustable in lighting range
WO2006122110A2 * May 9, 2006 Nov 16, 2006 Seo Precision, Inc. Omnidirectional light
WO2006122110A3 * May 9, 2006 Nov 1, 2007 Seo Prec Inc Omnidirectional light
WO2008018647A1 * Aug 11, 2006 Feb 14, 2008 Iljin Display Co., Ltd. Projection-type liquid crystal display
WO2010109385A1 * Mar 18, 2010 Sep 30, 2010 Koninklijke Philips Electronics N.V. Gobo projector and moving head
WO2012109168A1 * Feb 6, 2012 Aug 16, 2012 Intematix Corporation Photoluminescence color wheels
U.S. Classification 362/293, 353/84, 348/E09.027, 348/E05.141, 348/E05.143
International Classification H04N9/31, H04N5/74, G02B7/00, F21S10/00
Cooperative Classification G02B7/006, H04N9/3144, G02B26/008, H04N5/7441, F21S10/007, H04N9/3141, H04N9/3114