JP2007248939A - Projector with function of projecting two-dimensional positional information - Google Patents

Projector with function of projecting two-dimensional positional information Download PDF

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Publication number
JP2007248939A
JP2007248939A JP2006073825A JP2006073825A JP2007248939A JP 2007248939 A JP2007248939 A JP 2007248939A JP 2006073825 A JP2006073825 A JP 2006073825A JP 2006073825 A JP2006073825 A JP 2006073825A JP 2007248939 A JP2007248939 A JP 2007248939A
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Japan
Prior art keywords
color
color wheel
projector
light
combination
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JP2006073825A
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Japanese (ja)
Inventor
Takeshi Matsuoka
毅 松岡
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Plus Vision Corp
プラスビジョン株式会社
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Priority to JP2006073825A priority Critical patent/JP2007248939A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector capable of projecting a clear image while projecting positional information on a projection screen. <P>SOLUTION: The projector is configured to project an image with light which is selectively transmitted by color wheels, and includes the first color wheel 300 having a first color filter array and a second color wheel 310 having a second color filter array. When the first and the second color wheels are laid with the first combination, the wavelengths of visible R, G, B and W light beams are selectively transmitted through the color wheels, and when the first and the second color wheels are laid with the second combination, R, G, B and non-visible light beams are transmitted. The positional information showing the coordinate position on the projection screen is projected on the projection screen by using the non-visible light. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a front-projection or rear-projection projector capable of projecting an image such as a television or a DVD, and more particularly to a projector that projects two-dimensional position information on a projection surface by the projector and the projection surface. The present invention relates to a projector having an input function capable of projecting the position of an input device onto a projection plane.

  2. Description of the Related Art A projection display system having an electronic blackboard function that combines and displays handwritten information on a projection image by a projector and a projector function is known. This is a device that generates ultrasonic waves at a predetermined position on the electronic blackboard, detects the position of the pen based on the principle of triangulation, creates writing information based on the detected position information, and projects it. It is synthesized with the image.

  Patent Document 1 relates to an electronic blackboard system using a projector, and a whiteboard signal processor is provided with an infrared light receiving unit, an ultrasonic oscillation unit, and an ultrasonic receiving unit. An infrared light pulse and an ultrasonic pulse are simultaneously output from the electronic pen. The signal processor measures the distance from the input of the infrared light pulse to the infrared light receiving unit to the input of the ultrasonic wave to the ultrasonic receiving unit, thereby determining the distance from the electronic pen to the ultrasonic receiving unit. know. Since the ultrasonic light receiving unit is fixed to the signal processor, the position of the electronic pen viewed from the ultrasonic receiving unit can be obtained from the principle of triangulation. Project the image on the whiteboard with the projector, calculate the position of the electronic pen in the projected image, and as a result, output the coordinates of the electronic pen to the personal computer, move the mouse cursor, icon on the screen It is possible to specify.

JP 2005-128611 A

  However, in the electronic blackboard system as shown in Patent Document 1, a device such as an ultrasonic generator has to be provided on the projection screen of the projector, and the available place and range are limited. Furthermore, there is a problem that the apparatus becomes larger and the cost becomes higher.

  On the other hand, the present applicant has proposed Japanese Patent Application No. 2005-196372 (filed on July 5, 2005, hereinafter referred to as a prior application) as a technique for solving such problems. In this technique, a projector projects position information indicating a position in a plane of a projection image with invisible light, and creates a handwritten image on the projection plane using the position information.

  As shown in FIG. 11, the color wheel used in the prior application has R, G, and B color filters 10, 12, and 14 and an infrared light transmission filter 16. Infrared light is extracted from the light. However, in this method, since a certain area of the color filter is assigned to infrared light, there is still a problem that the brightness and hue of the image are reduced in a normal projection operation.

  Accordingly, an object of the present invention is to solve the above-described conventional problems and to provide a projector capable of projecting a clearer and higher brightness image while projecting position information onto a projection surface.

  The projector according to the present invention selectively transmits light using a color wheel and projects using the light, and includes a first color wheel having a first color filter array and a second color filter. A color wheel device including a second color wheel having an array, wherein the first color wheel and the second combination of the second color wheel or the second combination can be selected. When the first and second color wheels are in the first combination, visible light of different wavelengths is selectively transmitted, and when the first and second color wheels are in the second combination, at least non- When visible light is transmitted and non-visible light is transmitted, position information representing the position of the projection surface can be projected onto the projection surface.

  Preferably, the projector further includes modulation means for modulating light from the color wheel device, and when the modulation means is in the first combination, it modulates light based on image data, and converts the light into the second combination. At some point, the invisible light is modulated based on the position information.

  The predetermined color filter of the first color wheel and the color filter different from the predetermined color filter of the second color wheel overlap to form a visible light blocking region. For example, the first color wheel includes red (R), green (G), and blue (B) color filters, and the second color wheel includes a red (R) color filter. In the first combination, the R of the first color wheel and the R of the second color wheel are overlapped, and in the second combination, G or B of the first color hole is changed to R of the second color wheel. And a visible light blocking region is formed. Of course, the visible light blocking region may be other than the above combination. The first and second color wheels are arranged on the same rotation axis, and the first combination or the second combination is selected according to the rotation direction.

  According to the present invention, a projection method for projecting position information onto a projection plane projected by a projector includes a first color wheel having a first color filter array and a second color wheel having a second color filter array. When the first and second color wheels are rotated in combination with the first position, the step of selectively transmitting the invisible light, modulating the transmitted invisible light, and changing the position of the projection surface Displaying the position information to be displayed on the projection plane.

  According to the present invention, when the first and second color wheels are used and both are in the second combination, light other than visible light (invisible light) is projected and selected in the first combination. Since the visible light is projected, the position information can be projected by the invisible light without reducing the accuracy of the projected image by appropriately selecting the combination.

  Hereinafter, a preferred configuration of the projector according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing a general optical system of a projector according to an embodiment of the present invention. The projector 100 preferably projects an image by the DLP method using DMD (Digital Micro-mirror Device). The light emitted from the light source 110 is reflected by an elliptical mirror 112 that is a condensing mirror and is incident on a light tunnel or optical integrator 114 that is an optical component. The light having a uniform light flux in the light tunnel 114 is incident on the color wheel device 116.

  As will be described later, the color wheel device 116 is a combination of two color wheels. Depending on the combination position, visible light of red (R), green (G), blue (B), or infrared is used. Transmits visible light including light. The transmitted light sequentially illuminates the DMD 126 via the condenser lens 120, the folding plane mirror 122, and the folding spherical mirror 124. The reflected light of the DMD 126 is incident on the projection lens 128, where it is magnified and projected on a screen.

  FIG. 2 is a block diagram showing an electrical configuration of the projector. The projector 100 receives an analog image input signal or a digital image input signal Din, generates RGB digital image data having a format plane corresponding to the number of pixels of the DMD, and a digital image from the preprocessing unit 200. The control unit 210 that controls the driving of the DMD 126 based on the data, the light source driving circuit 220 that controls the driving of the light source 110, the color wheel driving unit 230 that controls the operation of the color wheel device 116, and the color wheel device 116 An optical system 240 (condenser lens 120, folding plane mirror 122, spherical mirror 124 in FIG. 1) that irradiates light onto the DMD 126, and a projection optical system 250 (FIG. 1) that magnifies the reflected light from the DMD 126 and displays it on the screen. Projection lens 128) and user input And an input unit 260 to receive.

  FIG. 3 is a perspective view of the color wheel device. The color wheel device 116 includes a first color wheel 300, a second color wheel 310 that is coaxially mounted thereon, a main body case 320 that accommodates the first and second color wheels, and first and second color wheels. A motor 330 (see FIG. 1) coupled to the color wheel bearing and a drive circuit 340 for driving the motor 330. A cutout 322 is formed in the main body case 320 so that light from the light source is incident on the first color wheel 300 and emitted from the second color wheel 310 side through the cutout 322. It has become.

  FIG. 4 is a diagram for explaining the details of the first and second color wheels. The first color wheel 300 is formed of a circular thin glass material, and a circular through hole 302 is formed at the center thereof. The through hole 302 serves as a bearing portion coupled to the rotation shaft of the motor 330. On the outer periphery of the bearing portion, red (R), green (G), blue (B) and white (W) transmission regions are formed in the circumferential direction. The R, G, and B transmission regions are formed, for example, by coating the surface of a glass material with a filter that transmits R, G, and B light. The white transmissive region does not need to be specifically coated with a filter. The areas of the R, G, B, and W color filters have a fan-shaped area with an inner angle of 90 degrees with respect to the rotation center, and are equal to each other. In addition, a cylindrical protruding pin 304 is formed on a surface between the bearing portion of the first color wheel 300 and the color filter region and facing the second color wheel 310.

  The second color wheel 310 is made of a thin glass sheet having the same size as the first color wheel, and a through hole (bearing portion) 312 coupled to the rotation shaft of the motor 330 is formed at the center thereof. A positioning opening 314 is formed on the outer periphery thereof. The positioning opening 314 is an arc-shaped slot that is concentric with the rotation center between the bearing portion and the color filter region, and has an inner angle of 90 degrees with respect to the rotation center. In the circumferential direction of the second color wheel 310, a transmission region that transmits R, G, and W light is formed. The internal angles of R and G are each 90 degrees, and the internal angle of W is 180 degrees. The R and G transmission regions are coated with a filter in the same manner as the first color wheel.

  When the first and second color wheels are mounted on the same axis, the protrusion 304 of the first color wheel 300 is inserted into the positioning opening 314. When the motor 330 is rotated forward, the first and second color wheels are rotated with the protrusion 304 in contact with one end of the positioning opening 314. When the motor 330 is rotated in reverse, the protrusion 304 is positioned. The first and second color wheels rotate in contact with the other end of the opening 314. Thus, the relative positions or angles of the first color wheel 300 and the second color wheel 310 are shifted by 90 degrees in accordance with the rotation direction of the motor.

  FIG. 5 is a diagram for explaining a change in the color arrangement when the first and second color wheels are combined. FIG. 5A shows a transmission region of R, G, B of the first color wheel 300 and transmission of R, G of the second color wheel 310 when the motor 330 is rotated in the first direction, for example, forward. The area overlaps completely. Thereby, the arrangement of the colors when the first and second color wheels are combined is equal to the arrangement of the color filters of the first color wheel, that is, R, G, B, and W, and these lights are Output sequentially from the color wheel device.

  On the other hand, when the motor 330 is rotated in the second direction, for example, reverse, as shown in FIG. 5B, the position of the first color wheel is relatively shifted by 90 degrees. The transmission region and the G transmission region of the second color wheel completely overlap. As a result, the color arrangement when the first and second color wheels are combined becomes R, G, B, invisible light, and R, G, B, and invisible light are sequentially output from the color wheel device. . The invisible light is a visible light blocking region by a combination of R of the first color wheel and G of the second color wheel. Of course, the combination of invisible light may be R and B, B and G, or the like other than the combination of R and G described above.

  Next, the operation of the projector of this embodiment will be described with reference to the operation flow of FIG. First, the projection mode of the projector is selected (step S101). The projection mode of the present embodiment includes a normal mode in which movies and other images are displayed brightly, and an interactive mode in which a user's pen input can be written on the projection surface. The normal mode is preferably selected when a high-luminance image such as a home theater is projected, and the interactive mode is used as a data projector mainly using still images such as a presentation. In the normal mode, the color wheel combination shown in FIG. 5A is selected, and in the interactive mode, the color wheel combination shown in FIG. 5B is selected. The selection of the projection mode is performed according to a user instruction from the input unit 260 (see FIG. 2).

  The control unit 210 determines the selected projection mode (step S102), and if it is the normal mode (step S103), the motor 330 is rotated forward (step S104), and the combination shown in FIG. 5A is selected. . Then, the control unit 210 drives the DMD 126 based on the image data to be projected, sequentially modulates R, G, B, and W light, and displays a color image on the projection plane (step S105).

  On the other hand, when the interactive mode is determined (step S106), the control unit 210 reversely rotates the motor 330 (step S107) and selects the combination shown in FIG. Then, the control unit 210 drives the DMD 126 based on position information indicating the coordinate position of the projection plane in addition to the image data, displays an image by modulation of R, G, and B, and projects the position information by invisible light. It is displayed on the screen (step S108).

  In the interactive mode, invisible light is transmitted every time the color wheel rotates once. The invisible light of the present embodiment is preferably infrared light included in light emitted from the light source. In synchronization with the timing at which the infrared light transmitted from the color wheel device irradiates the DMD 126, the control unit 210 drives the DMD 126 with position information. A technique for driving DMD based on position information using infrared light is disclosed in detail in the above-mentioned prior application.

  For example, as illustrated in FIG. 7, when the DMD 126 has M × N pixels, M × N pixels are projected onto the projection plane 350. On the projection surface 350, for example, identification patterns P (1,1), P (1,2), P (1,3)... P (1, N),. M, N) is projected. Each identification pattern includes a unique pixel pattern for identifying a coordinate position. Position information including such an identification pattern P is stored in the memory, and the control unit 210 converts the position information read from the memory into DMD format information, and the DMD 126 is illuminated with infrared light. To drive the DMD 126.

  Since the position information projected on the projection surface is projected with infrared light, even if another image is displayed while being projected with visible light (R, G, B), it interferes with that image. Never do. Since infrared light is projected at a constant rate, the brightness and hue of the projected image are reduced. However, there is no problem if the image is a still image or a black and white image that does not place much importance on the hue, such as a presentation.

  Further, in the interactive mode, the movement path of the input pen can be drawn on the projection plane by optically reading the position information of the projection plane 350 with the input pen. Details of this technique are disclosed in the above-mentioned prior application.

  For example, a pointing device as shown in FIG. 8 can be used as the input pen. The pointing device 400 includes an imaging device 420 including a CCD for detecting infrared light in a pen-shaped housing 410, an analog / digital converter 430 that converts an imaging signal captured by the imaging device 420 into a digital signal, An image processing circuit 440 that pattern-matches the converted digital signal with an identification pattern, and a transmission circuit 450 that transmits data to the projector 100 are included.

  An objective lens is attached to the front end 460 of the housing 410, and the identification pattern P is read by the imaging device 420 via the objective lens by bringing the pointing device into contact with or close to the projection surface 300. The read signal is binarized by the analog / digital converter 430 and supplied to the image processing circuit 440, where the coordinate position of the read identification pattern is detected. The image processing circuit 440 transmits the detected coordinate position to the projector 100 via the transmission circuit 450.

  Upon receiving the coordinate position from the pointing device 400, the control unit 210 generates image data corresponding to the movement trajectory of the pointing device 400 based on the received coordinate position, and synthesizes the image data projected on the projection plane. Do. The synthesized image data is displayed on the projection plane by the DMD 126. In this way, characters, figures, and the like drawn by the pointing device 400 on the projection plane 300 are combined and displayed as if they were overwritten on the projected image.

  As described above, according to the present embodiment, by changing the combination of a plurality of color wheels, the normal mode in which color and brightness are emphasized, and the interactive display capable of displaying the position information and drawing the user input on the projection plane Since the mode can be selected, the position information can be projected and interactive with the user can be performed while maintaining the quality of the projected image.

  In the above-described embodiment, the first and second color wheels of the color wheel device are driven by a single motor, and the combination of the color wheels is changed depending on the rotation direction. The two color wheels may be driven by individual motors, and the combination position of the first and second color wheels may be changed by the motor.

  Furthermore, for the first and second color wheels, various arrangements can be selected in addition to the arrangement of the filters shown in FIG. FIG. 9 is a diagram showing an arrangement of other filters of the first and second color wheels. The first color wheel 300a has R, G, and B color filters with an inner angle of 70 degrees, and the rest is W. The second color wheel 310a has R and G color filters with an inner angle of 70 degrees, and the rest is W. Here, the inner angle of the positioning opening 314 (see FIG. 4) of the arc-shaped slot formed in the second color wheel 310a is set to 20 degrees, and the second color wheel 310a is relatively to the first color wheel 300a. The angle at which the angle can be changed is 20 degrees.

  When the first and second color wheels 300a and 310a are rotated in the first direction (for example, forward rotation), as shown in FIG. 9A, R and G of the first and second color wheels These color filters match, and the synthesized color filters are R, G, B, and W.

  On the other hand, when the first and second color wheels 300a and 300b are rotated (for example, reversed) in the second direction, as shown in FIG. 9B, the first and second color wheels 300a and 300b are rotated. Since the relative angle of 310a is shifted by 20 degrees, a part of the R color filter of the first color wheel 300a and a part of the G color filter of the second color wheel overlap to form a non-visible light region. That is, when synthesized, R, invisible light, G, B, and W light are transmitted. The overlapping range of the color filters R and G can be adjusted by the angle of the positioning opening 314.

  Moreover, although the example which uses the infrared light from a light source as invisible light was shown in the said Example, you may prepare the light source for exclusive use for emitting infrared light separately.

  Next, an example in which the projector of the present invention is applied to an electronic blackboard is shown in FIG. The electronic blackboard 500 has a drawing surface 510 for drawing characters, graphics, and the like, and the projector 100 is disposed below the drawing surface 510. An image projected by the projector 100 is projected on the drawing surface 510 as a so-called rear projection. In the interactive mode, position information is displayed on the drawing surface 510 by infrared light. When the pointing device 400 is moved on the drawing surface 510, image data corresponding to the movement locus is generated by the projector, and the movement locus 520 is projected onto the drawing surface 510.

  Although the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the specific embodiment, and various modifications, within the scope of the gist of the present invention described in the claims, It can be changed. In the above embodiment, the DLP projector is exemplified, but a projector using a modulation scheme other than this may be used.

  The projector and the projector system according to the present invention can be used as a display device with an input function for displaying images and the like.

It is a figure which shows the optical system of the projector which concerns on the Example of this invention. It is a block diagram which shows the electric constitution of the projector which concerns on the Example of this invention. It is a perspective view which shows the structure of a color wheel apparatus. It is a figure which shows the detail of a color wheel. It is a figure explaining the change of the color arrangement | sequence by the combination of a color wheel. It is a flowchart explaining operation | movement of a projector. It is a figure which shows the relationship between the projection surface by a projector, and an identification pattern (position information). It is a block diagram which shows the structure of a pointing device. It is a figure explaining the color wheel apparatus which concerns on a 2nd Example. It is a figure which shows the example which applied the projector which concerns on the Example of this invention to the electronic blackboard. It is a figure which shows the color wheel of a prior application.

Explanation of symbols

100: Projector 110: Light source 116: Color wheel device 126: DMD
300: First color wheel 302: Through hole (bearing portion)
304: Pin 310: Second color wheel 312: Through hole (bearing portion) 314: Positioning opening 320: Main body case 330: Motor 340: Drive circuit 350: Projection surface 400: Pointing device 410: Housing 420: Imaging device 450 : Transmission circuit 500: Electronic blackboard 510: Drawing surface

Claims (7)

  1. A projector that selectively transmits light by a color wheel and projects using the light,
    A first color wheel having a first color filter array and a second color wheel having a second color filter array, the first combination of the first color wheel and the second color wheel or It has a color wheel device that can select two combinations,
    When the first and second color wheels are in the first combination, different wavelengths of visible light are selectively transmitted;
    When the first and second color wheels are in the second combination, at least invisible light is transmitted;
    A projector capable of projecting position information representing the position of the projection plane onto the projection plane when invisible light is transmitted.
  2. The projector further includes modulation means for modulating light from the color wheel device. When the modulation means is in the first combination, it modulates light based on image data and is in the second combination. The projector according to claim 1, wherein the invisible light is modulated based on the position information.
  3. When in the second combination, the predetermined color filter of the first color wheel and the color filter different from the predetermined color filter of the second color wheel overlap, and a visible light blocking region is formed, The projector according to claim 1 or 2.
  4. The projector according to claim 1, wherein the first and second color wheels are arranged on the same rotation axis, and the first combination or the second combination is selected according to the rotation direction.
  5. The first color wheel includes at least red (R), green (G), and blue (B) color filters, and the second color wheel includes red (R), green (G), and blue (B). The projector according to claim 1, comprising at least one color filter.
  6. A projection method for projecting position information onto a projection surface projected by a projector,
    When a first color wheel having a first color filter array and a second color wheel having a second color filter array are combined in a first position and the first and second color wheels are rotated, non- Selectively transmitting visible light; and
    Modulating the transmitted invisible light and displaying position information representing the position of the projection plane on the projection plane;
    A projection method.
  7. The projection method further includes combining a first color wheel having a first color filter array and a second color wheel having a second color filter array in a second position, and combining the first and second color wheels. Selectively transmitting visible light when rotated, and
    And modulating the transmitted visible light to display an image on the projection surface.
JP2006073825A 2006-03-17 2006-03-17 Projector with function of projecting two-dimensional positional information Pending JP2007248939A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011128522A (en) * 2009-12-21 2011-06-30 Casio Computer Co Ltd Light source unit and projector
DE102016111731B3 (en) * 2016-06-27 2017-07-13 Carl Zeiss Ag Lighting device for a light modulator having a projector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011128522A (en) * 2009-12-21 2011-06-30 Casio Computer Co Ltd Light source unit and projector
DE102016111731B3 (en) * 2016-06-27 2017-07-13 Carl Zeiss Ag Lighting device for a light modulator having a projector

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