JP2006220751A - projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce brightness and color reproducibility of an entire image because the light quantity of each color or the brightness of the entire image is restricted by the color separation filter in a conventional single-plate projector using a rotary color separation filter. There was a trade-off between them.
A movable reflecting mirror that reflects light emitted from a lamp 1 so as to be incident on filter segments 2R, 2G, 2B, and 2W that respectively transmit white light and a plurality of chromatic light of a color separation filter 2. 11, the filter segments 2R, 2G, 2B, and 2W of the respective colors are transmitted for an arbitrary period and are incident on the DMD 3.
[Selection] Figure 1

Description

  The present invention separates light emitted from a light source into light of each color by a filter segment that transmits light of a plurality of colors, projects the light onto spatial light modulation means such as a DMD (Digital Micromirror Device), etc., and supplies the light to the DMD The present invention relates to a projector that projects a color image by performing spatial light modulation based on the image data for each color.

  In the field of presentation or video projection, a projector that projects an image based on image data input from a computer or various video playback devices onto an external screen or the like is used. Such a projector represents an image obtained by modulating light from an internal light source based on image data by providing image data to a spatial light modulator, specifically, a liquid crystal panel or a DMD (Digital Micromirror Device). Modulated light is generated and the generated modulated light is projected onto an external screen or the like.

  By the way, in the projector as described above, conventionally, light of each color of R (red), G (green), and B (blue) and possibly white light is time-divided into one plate-like spatial light modulation means. A method of projecting a color image by projecting, and generally modulating light for each color by projecting light of each color of R (red), G (green), and B (blue) to each of three spatial light modulation means There is a method of projecting a color image by generating light and synthesizing them.

  The former method is generally called a single plate method. In the case of this single-plate method, the light emitted from the light source is conventionally used for each chromatic color using a color wheel that rotates a filter segment that transmits each chromatic (R, G, B) light and possibly white light. In some cases, it is separated into white and given to the spatial light modulation means by time division.

  By the way, in the single-plate projector as described above, filter segments that transmit light of three colors or four colors are arranged on the color wheel, and the modulation period by the spatial light modulation means (the components of each color of the image data are spatial light). It is necessary to rotate in synchronization with the period provided to the modulation means. Therefore, for example, when four colors including white are used, the filter for each color of the color wheel is divided into four equal parts, that is, 90 degrees for each color. Therefore, when correcting the color reproducibility, color temperature, etc. of each color on the image which is modulated and projected by the spatial light modulation means, the image display within the 90 degree range of the color wheel assigned to each color The reality is that it depends only on the length of the signal.

  However, in a projector called a data projector, which is mainly used for displaying a computer monitor screen as it is, priority is given to the brightness (luminance) of the projected image. By providing the color wheel with a filter segment that transmits white light having a large angle, an image projected from the spatial light modulator is brightened. However, in this case, it goes without saying that the filter segments that transmit light of each color other than white are relatively small, and as a result, the amount of light of each color other than white decreases and good color reproducibility cannot be obtained. .

  Conventionally, as described above, such a situation has been dealt with by extending the period of the image display signal within the range of angles assigned to each color on the color wheel. However, it is impossible in principle to make the image display signal of each color longer than the period corresponding to the angle assigned to the filter segment that transmits the light of each color. Conversely, if the period of the image display signal is shortened within the range of the angle assigned to white on the color wheel with emphasis on color reproducibility and color temperature, the brightness of the image projected from the spatial light modulator is reduced. Of course, it goes without saying that the brightness decreases and the luminance decreases.

  In view of such circumstances, Patent Document 1 discloses that the color wheel is concentrically divided into a plurality of annular portions, and the angles assigned to the filter segments that transmit light of each color in the annular portions are different. An invention of a configuration in which the rotation center of a simple color wheel is translated in a direction intersecting with light emitted from a light source is disclosed. In the invention disclosed in Patent Document 1, by moving the rotation center of one color wheel, the angles assigned to the filter segments that transmit the light of each color are different, in other words, color reproducibility, A configuration in which a plurality of types of color wheels having different color temperatures or the like are used in accordance with the purpose of use of the projector can be substantially realized. In the invention disclosed in Patent Document 1, when a color image is projected, a color wheel for color is used. When a black and white image such as a document created by a computer is projected, high brightness for black and white is used. It is also possible to easily use each color wheel.

In Patent Document 2, the light emitted from the light source is projected so as to be reflected by all the reflection elements for R, G, and B colors, and the light reflected by the reflection elements corresponding to the respective colors is reflected on each of them. It is configured to transmit a prism that separates only the color light, and the corresponding color in the reflective element is synchronized with the timing at which the display light reflective element (spatial light modulation means) is in a state corresponding to the image of each color. An invention of a projector is disclosed in which only the portion for turning on is turned on, that is, the light emitted from the light source is reflected.
JP 2003-307705 A JP 2004-085813 A

  However, in the invention described in Patent Document 1 described above, a mechanism for linearly moving the entire color wheel by a considerable distance is required, but such a mechanism is required to have high precision and to have earthquake resistance. Therefore, there is a possibility that the durability is poor. In addition to the invention described in Patent Document 1, a general projector using a color wheel has a problem that noise caused by the rotation of the color wheel cannot be ignored.

  Further, in the invention disclosed in the cited document 2, since the light emitted from the light source is always reflected by the reflecting elements for each color of R, G, B, 1 / of the amount of light emitted from the light source. 3 is only used for image projection, and in other words, it is necessary to adopt a very wasteful configuration in which a light source that emits three times the amount of light that is originally required is required. There is no problem.

  As described above, in a projector using a color wheel in the conventional single plate method, there is a trade-off relationship between the brightness of the image projected from the spatial light modulation means, color reproducibility, and color temperature. I had to make a compromise. Further, in the invention disclosed in the cited document 2, it is possible to arbitrarily adjust the on / off period of the light reflecting element for each color, in other words, the period in which the light emitted from the light source is reflected as the light of each color. Although it is conceivable, as a problem before that, since only 1/3 of the light emitted from the light source is used for the projection of the actual image, there is a problem from the viewpoint of energy saving, and the calorific value from the light source is There is a problem that cooling measures are important because it is unavoidable that the number is more than necessary.

  The present invention has been made in view of the circumstances as described above, and its main purpose is to capture an image projected from a spatial light modulation means existing in a projector using a color wheel in a conventional single plate system. The main object is to provide a projector that can eliminate the trade-off relationship between brightness, color reproducibility, and color temperature, and can also eliminate the problems of the inventions described in Patent Document 1 and Patent Document 2. To do.

  The projector according to the present invention is simply a filter for each color in which the filter segment is fixed and the optical path from the light source to the spatial light modulation means is fixed instead of rotating the conventional color wheel with the filter segment. It is configured to switch so as to transmit the segment.

  The projector according to the present invention includes a light source that emits white light, spatial light modulation means that sequentially converts the emitted light from the light source into modulated light that represents a plurality of chromatic components constituting an image, and the light source. Separating means for separating the light emitted from the light source into the plurality of chromatic colors in synchronization with the timing at which the spatial light modulation means sequentially converts the light emitted from the light source into a plurality of chromatic colors. The color separation unit includes a plurality of filter segments that respectively transmit the plurality of chromatic light beams, and an optical path of light emitted from the light source between the light source and the spatial light modulation unit Is provided with optical path switching means for switching so as to pass through each of the plurality of filter segments of the color separation means and reach the spatial light modulation means.

  In such a projector according to the present invention, the color separation means does not rotate or move, but the light separation path of the light emitted from the light source between the light source and the spatial light modulation means has a plurality of existence. It is switched so as to pass through each of the filter segments that transmit the chromatic color and reach the spatial light modulation means.

  The projector according to the present invention is the projector according to the invention described above, wherein the light path switching means is converted by the spatial light modulation means by adjusting a time during which the light emitted from the light source passes through each of the plurality of filter segments. And a control means for adjusting the intensity of the chromatic component of the image represented by the modulated light.

  In such a projector according to the present invention, in the projector invention described above, the light path switching means adjusts the time during which the light emitted from the light source passes through each of the filter segments that transmit a plurality of chromatic colors, thereby the spatial light modulation means. The intensity of the chromatic component of the image represented by the modulated light converted by is adjusted.

  The projector according to the present invention is the projector invention described above, wherein the plurality of filter segments included in the color separation unit are arranged in a straight line, and the optical path switching unit is configured to change an optical path of light emitted from the light source. An optical optical path switching means for switching in the direction of each of the plurality of filter segments arranged in a straight line of the color separation means, and an optical path of the light transmitted through each of the plurality of filter segments of the color separation means in the direction of the spatial light modulation means And an optical light path changing means for directing the light.

  In the projector according to the present invention as described above, in the projector invention described above, the optical path of the light emitted from the light source is switched in the direction of each of the filter segments that transmit a plurality of chromatic colors arranged in a straight line of the color separation means, The optical path of the light transmitted through each of the filter segments that transmit the plurality of chromatic colors of the color separation means is directed toward the spatial light modulation means.

  Further, the projector according to the present invention includes a light source that emits white light, and a space that sequentially converts the emitted light from the light source into modulated light representing a plurality of chromatic components constituting the image and modulated light representing white. The light modulation means, and the light emitted from the light source between the light source and the spatial light modulation means is synchronized with the timing at which the spatial light modulation means sequentially converts the light into a plurality of chromatic colors and white. And a color separation unit that separates the chromatic color and the white color. The color separation unit includes a plurality of filter segments that respectively transmit the chromatic color and white light, and the light source and the spatial light modulation. An optical path switch for switching the optical path of the emitted light from the light source to the spatial light modulation means so as to pass through each of the plurality of filter segments of the color separation means and reach the spatial light modulation means. Characterized by comprising a means.

  In such a projector according to the present invention, the color separation means does not rotate or move, but the light separation path of the light emitted from the light source between the light source and the spatial light modulation means has a plurality of existence. The filter segments are switched so as to pass through the filter segment that transmits the chromatic color and the filter segment that transmits the white light and reach the spatial light modulation means.

  The projector according to the present invention is the projector according to the invention described above, wherein the light path switching means is converted by the spatial light modulation means by adjusting a time during which the light emitted from the light source passes through each of the plurality of filter segments. And a control means for adjusting the intensity and / or brightness of the chromatic color component of the image represented by the modulated light.

  In such a projector according to the present invention, in the projector invention described above, the light path switching means adjusts the time during which the light emitted from the light source passes through each of the filter segment that transmits a plurality of chromatic colors and the filter segment that transmits white light. Thus, the intensity of the chromatic color component of the image represented by the modulated light converted by the spatial light modulation means and / or the brightness of the entire image is adjusted.

  The projector according to the present invention is the projector invention described above, wherein the plurality of filter segments included in the color separation unit are arranged in a straight line, and the optical path switching unit is configured to change an optical path of light emitted from the light source. An optical optical path switching means for switching in the direction of each of the plurality of filter segments arranged in a straight line of the color separation means, and an optical path of the light transmitted through each of the plurality of filter segments of the color separation means in the direction of the spatial light modulation means It is characterized in that it is provided with an optical path changing means for directing to the right.

  In such a projector according to the present invention, in the projector invention described above, in the direction of each filter segment that transmits a plurality of chromatic colors and white light in which the optical path of the light emitted from the light source is linearly arranged in the color separation means. The optical path of the light that has been switched and passed through the filter segment that transmits the plurality of chromatic colors and the filter segment that transmits white light of the color separation unit is directed toward the spatial light modulation unit.

  The projector according to the present invention is the projector according to the invention described above, wherein the spatial light modulation unit discriminates at least two types of images in which the light emitted from the light source is converted into modulated light, and the discrimination result by the discrimination unit. And a first control for transmitting only the filter segment that transmits the chromatic color of the color separation unit and the filter segment that transmits the chromatic color light and the white light. And the control means for performing any one of the two controls.

  In such a projector according to the present invention, in the projector invention described above, at least two types of images in which the spatial light modulation means converts the light emitted from the light source into modulated light are discriminated. The first control for transmitting only the filter segment that transmits the chromatic color of the color separation means and the second control for transmitting the filter segment that transmits the chromatic color light and the white light. Performed selectively.

  In the projector according to the invention, in the projector invention described above, one of the two types of images determined by the determination unit is an image output from a monitor of a computer, and the control unit is an image generated by the determination unit. The second control is performed when the determination result is an image of a monitor output of a computer.

  In such a projector according to the present invention, in the projector invention described above, one of the two types of discriminated images is a computer monitor output image, and the image discrimination result is a computer monitor output image. In some cases, the second control is performed.

  The projector according to the present invention is any one of the projector inventions described above, wherein the chromatic colors are red, green, and blue.

  In such a projector according to the present invention, in any one of the projector inventions described above, a color image composed of red, green, and blue is projected.

  The projector according to the present invention is any one of the projector inventions described above, wherein the chromatic colors are cyan, magenta, and yellow.

  In such a projector according to the present invention, in any one of the projector inventions described above, a color image composed of cyan, magenta, and yellow is projected.

  The projector according to the present invention is the projector according to any one of the inventions described above, wherein the chromatic colors are red, green, blue, cyan, magenta, and yellow.

  In such a projector according to the present invention, in any one of the projector inventions described above, a color image composed of red, green, blue, cyan, magenta, and yellow is projected.

  The projector according to the present invention is any one of the projectors described above, wherein the chromatic colors are red, green, and blue, and cyan and / or magenta and / or yellow.

  In such a projector according to the present invention, in any one of the projector inventions described above, a color image composed of red, green, and blue and cyan and / or magenta and / or yellow is projected.

  According to the projector according to the present invention as described above, the optical path of the emitted light from the light source between the light source and the spatial light modulating unit is switched, and the optical path of the emitted light from the light source has a plurality of chromatic colors that the color separating unit has. Each of the filter segments that transmit the light reaches the spatial light modulation means, so that the problem caused by the rotation of the color wheel is solved, and the light emitted from the light source can be used without waste to project an image. It becomes possible.

  According to the projector of the present invention, in the projector of the above invention, it is possible to arbitrarily adjust the time during which the light emitted from the light source passes through each of the filter segments that transmit a plurality of chromatic colors by the optical path switching means. Therefore, it is possible to arbitrarily adjust the intensity of the chromatic color component of the image represented by the modulated light converted by the spatial light modulation means.

  According to the projector of the present invention, in the projector of the above invention, the light transmitted through each of the filter segments that transmit the plurality of chromatic colors of the color separation means is incident on the spatial light modulation means without using a color wheel. The projector can be realized with a relatively simple mechanism with high accuracy and high durability.

  According to the projector of the present invention, the light path of the emitted light from the light source between the light source and the spatial light modulating means is switched, and the optical path of the emitted light from the light source has a plurality of chromatic colors and white light that the color separating means has. Each of the filter segments that transmit the light reaches the spatial light modulation means, so that the problem caused by the rotation of the color wheel is solved, and the light emitted from the light source can be used without waste to project an image. It becomes possible.

  Further, according to the projector according to the present invention, in the projector invention described above, the time required for the light emitted from the color light source to pass through each of the filter segments that transmit a plurality of chromatic colors and white light can be arbitrarily adjusted by the optical path switching means. Therefore, it is possible to arbitrarily adjust the intensity of the chromatic component of the image represented by the modulated light converted by the spatial light modulation means and the brightness of the entire image.

  Further, according to the projector according to the present invention, in the projector invention described above, the light transmitted through the filter segments that transmit the plurality of chromatic colors and white light of the color separation unit without using the color wheel is spatial light modulation unit. It is possible to realize a projector that enters the projector with high accuracy and high durability with a relatively simple mechanism.

  Furthermore, according to the projector of the present invention, in the projector invention described above, at least two types of input images are discriminated, and either one of the first control and the second control is selected according to the discrimination result. Therefore, an image with an appropriate image quality is automatically projected according to the input image.

  According to the projector of the present invention, in the projector invention described above, at least the monitor output image of the computer is discriminated. In this case, an image having an appropriate image quality according to the monitor output image of the computer is automatically generated. Projected on.

  According to the projector of the present invention, in any one of the above-described inventions, a color image composed of red, green, and blue is displayed in a monitor image of a computer in a state where a normal image is in good color reproduction. Can be projected with high brightness.

  Further, according to the projector according to the present invention, in any one of the above-described inventions, a color image composed of cyan, magenta, or yellow is displayed on a computer monitor image in a state where a normal image has good color reproducibility. Can be projected with high brightness.

  Furthermore, according to the projector of the present invention, in any one of the above-described inventions, a color image composed of red, green, blue, cyan, magenta, or yellow is used, and a normal image has good color reproducibility. In this state, the computer monitor image can be projected with high brightness.

Furthermore, according to the projector according to the present invention, in any one of the above inventions,
Color images composed of red, green, blue, and cyan and / or magenta and / or yellow may be projected with normal images in good color reproducibility and computer monitor images with high brightness. It becomes possible.

  Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof. FIG. 1 is a schematic diagram showing a configuration example of a main part of an embodiment of a projector according to the present invention.

  The projector according to the present invention includes a lamp 1 that is a light source that emits white light and, for example, red (R), green (G), blue (B), and white (W) light among the light emitted from the lamp 1. Color separation filter 2 having four types of filter segments that respectively transmit light, and spatial light modulation that spatially modulates outgoing light from lamp 1 that has passed through any of the filter segments of color separation filter 2 based on image data Basically, a DMD (Digital Micromirror Device) 3 as a means, a projection optical system 4 composed of a plurality of lenses for projecting modulated light modulated by the DMD 3 onto an external screen or the like, and a control system to be described later It is configured.

  The projector according to the present invention can be applied to a so-called front projection system that projects an image onto an external screen or the like, and a rear projection system that projects from the back of the screen. In the present embodiment, the DMD 3 is provided as the spatial light modulation means, but other spatial light modulation means such as a liquid crystal panel can be used as a matter of course. Further, appropriate optical systems such as a condenser lens 15, a rod integrator 16, and a movable reflecting mirror 17 are interposed between the color separation filter 2 and the DMD 3. The condenser lens 15 is provided to make light transmitted through the filter segments 2R, 2G, 2B, and 2W for each color of the color separation filter 2 enter one end of the rod integrator 16, and the rod integrator 16 enters from one end. The emitted light is emitted from the other end in a state where spatial light modulation by the DMD 3 is possible. Note that a reflecting mirror 17 is interposed between the rod integrator 16 and the DMD 3, but this is for adjusting the positional relationship between them.

  On the other hand, a movable reflecting mirror 11 is provided between the lamp 1 and the color wheel 2, which will be described in detail later, and reflects the emitted light from the lamp 1 so as to pass through each filter segment of the color wheel 2. . In this embodiment, the movable reflecting mirror 11 is controlled by a control circuit 5 such as a voice coil motor 11M as an actuator so that the light emitted from the lamp 1 is at different angles. The filter segments 2R, 2G, 2B, and 2W are configured to reflect in four directions. In other words, the movable reflecting mirror 11 is controlled to take four positions so that the light emitted from the lamp 1 enters the four types of filter segments 2R, 2G, 2B, and 2W of the color separation filter 2. However, when the color separation filter 2 has only three types of filter segments 2R, 2G, and 2B other than those for white, the position taken by the movable reflecting mirror 11 also corresponds to these three types of filter segments 2R, 2G, and 2B. It becomes 3 position to do.

  In this embodiment, the voice coil motor 11M is used as the actuator of the movable reflecting mirror 11. However, it goes without saying that a step motor, an ultrasonic motor, or the like may be used. Further, in the present embodiment, the flat movable reflector 11 is rotated by the voice coil motor 11M, but a polygonal mirror having a plurality of reflecting surfaces, each reflecting surface having a different reflection angle ( However, the number of reflecting surfaces may be a structure in which the number of filter segments included in the color separation filter 2 is rotated).

  FIG. 2 shows a configuration example of the color separation filter 2 as viewed from the movable reflecting mirror 11 side, more specifically, in a direction along the optical path where the emitted light from the lamp 1 enters the color separation filter 2. It is a schematic diagram which shows the state seen. In the present embodiment, as shown in FIG. 2, the color separation filter 2 has four substantially square windows opened along one direction of a rectangular frame 2F, and R, G, B, The filter segments 2R, 2G, 2B, and 2W for W are mounted. However, it is possible to pass through without attaching the W filter segment 2W.

  In addition, the circular portions indicated by reference numerals PR, PG, PB, and PW in FIG. 2 indicate regions where the light emitted from the lamp 1 is projected when the movable reflecting mirror 11 takes each of the four positions described above. ing. Hereinafter, the position taken by the movable reflecting mirror 11 so that the emitted light from the lamp 1 is projected to the projection region PR on the filter segment 2R for red is the first position (1P), The position taken by the movable reflecting mirror 11 so that the angle is projected to the projection area PG on the filter segment 2G is projected to the second position (2P) and projected onto the projection area PB on the filter segment 2B for the same blue color. The position taken by the movable reflecting mirror 11 to be such an angle is the third position (3P), and the movable reflecting mirror 11 is so projected as to be projected to the projection region PW on the filter segment 2W for the same white. The position to be taken is the fourth position (4P). Although details will be described later, the white filter segment 2W is mainly used together with the other three color filter segments 2R, 2G, and 2B when projecting a monitor screen of a computer. It is not used when projecting.

  For example, a voice coil motor 11M is attached to the movable reflecting mirror 11 as an actuator for rotating the rotation center axis thereof. The voice coil motor 11M is controlled by the control circuit 5 in accordance with a discrimination signal given from the video discrimination circuit 10 to be described later, so that the movable reflector 11 is in any one of the first to fourth positions described above. To control.

  The control system includes a control circuit 5 for controlling the entire projector according to the present invention using a microcomputer, a microprocessor, and the like, an operation unit 6 for a user to give an operation instruction from the outside, the above-described video discrimination circuit 10 and the like. It consists of Note that, for example, a TV broadcast video signal, a video signal reproduced from a DVD by a DVD player, a computer monitor screen video signal, and the like are input to the input terminal 9 from the outside. The video signal input from the input terminal 9 is naturally supplied to the DMD 3, but is also supplied to the video discriminating circuit 10 and the control circuit 5.

  By the way, since the projector according to the present invention is a so-called single-plate projector, the DMD 3 takes a state corresponding to digital image data for each color obtained by separating each frame of the video signal into three primary colors in a time division manner. Accordingly, the control circuit 5 controls the DMD 3 and the voice coil motor 11M so that the light of the corresponding color is projected from the color separation filter 2 to the DMD 3 in synchronization with the DMD 3 taking a state corresponding to the digital image data for each color. Control.

  In addition, the control circuit 5 receives an operation instruction given by the user from the operation unit 6, and an automatic mode in which the video determination circuit 10 automatically determines whether to use the white filter segment 2 W of the color separation filter 2. The manual mode to be performed according to the user's specification can be set. The control circuit 5 can also set each color and brightness individually by receiving an operation instruction given by the user from the operation unit 6.

  When the automatic mode as described above is set, the video discriminating circuit 10 analyzes the video signal input from the input terminal 9 according to the logic described later, and gives the analysis result to the control circuit 5. The control circuit 5 determines whether or not to use the white filter segment 2W according to the analysis result of the video signal given from the video discrimination circuit 10, specifically, the video signal inputted from the input terminal 9 changes the image of the computer monitor. When the video signal is represented, the white filter segment 2W is used. When the video signal input from the input terminal 9 is a TV video, a DVD playback video, or the like, the white filter segment 2W is not used. When the manual mode is set, regardless of the type of the video signal input from the input terminal 9, the control circuit 5 determines whether to use the white filter segment 2W according to the designation in the manual mode. To control.

  3 shows the movable reflector 11 when the white filter segment 2W is used (hereinafter referred to as data mode), and FIG. 4 shows the case where the white filter segment 2W is not used (hereinafter referred to as theater mode). It is a timing chart which shows the state of standard position control, respectively.

  3A shows the frame synchronization signal of the video signal input from the input terminal 9, and FIG. 3B shows the position where the movable reflecting mirror 11 should be taken, specifically the light emitted from the lamp 1, for each color. The voltage signals applied to the voice coil motor 11M corresponding to the positions for reflection toward the filter segments 2R, 2G, 2B are shown.

  As shown in FIG. 3A, when the theater mode in which the white filter segment 2W is not used is set, one frame of the video signal (for example, about 16 msec in the case of 60 frames per second). Further, the movable reflecting mirror 11 sequentially takes the first position, the second position, and the third position at which the emitted light from the lamp 1 is projected to the filter segments 2R, 2G, and 2B of the colors other than white. In addition, the voice coil motor 11M is controlled. Specifically, the control circuit 5 applies a voltage signal (V) to be applied to the voice coil motor 11M in accordance with a display period of three colors of R, G, and B obtained by dividing one frame of the video signal displayed on the DMD 3. Are v, 2v, and 3v.

  As a result, the control circuit 5 applies a voltage signal of v (V) to the voice coil motor 11M to rotate the movable reflecting mirror 11 to the first position 1P during the period when the DMD 3 is in the red display state in one frame. By moving the light, the light emitted from the lamp 1 enters the red filter segment 2R of the color separation filter 2. Further, the control circuit 5 applies a voltage signal of 2v (V) to the voice coil motor 11M and rotates the movable reflecting mirror 11 to the second position 2P while the DMD 3 is in the green display state in one frame. As a result, the emitted light from the lamp 1 is made incident on the green filter segment 2G of the color separation filter 2. Further, the control circuit 5 applies a voltage signal of 3v (V) to the voice coil motor 11M while the DMD 3 is in the blue display state in one frame, and rotates the movable reflecting mirror 11 to the third position 3P. As a result, the light emitted from the lamp 1 is made incident on the blue filter segment 2B of the color separation filter 2.

  As can be understood from FIG. 3, in the theater mode, the display period of red (R) of the three chromatic colors in each frame is longer than that of the other colors. Therefore, the period during which the movable reflecting mirror 11 is located at the first position 1P is also longer according to the red (R) display period. This is because the theater mode generally targets video signals of TV broadcasts, reproduced video signals from DVDs, and the like, so that the color of human skin is particularly expressed in good tone.

  On the other hand, as shown in FIG. 4A, when the data mode using the white filter segment 2W is set, the movable reflector 11 includes the white one for one frame of the video signal. The voices are sequentially taken so that the first position, the second position, the third position, and the fourth position at which the emitted light from the lamp 1 is projected onto the filter segments 2R, 2G, 2B, and 2W of the respective colors are sequentially taken. The coil motor 11M is controlled. Specifically, the control circuit 5 applies a voltage signal (applied to the voice coil motor 11M in accordance with a display period of three colors of R, G, and B, which is divided between one frame of a video signal displayed on the DMD 3, and white. Let V) be v, 2v, 3v, 4v.

  As a result, the control circuit 5 applies a voltage signal of v (V) to the voice coil motor 11M to rotate the movable reflecting mirror 11 to the first position 1P during the period when the DMD 3 is in the red display state in one frame. By moving the light, the light emitted from the lamp 1 enters the red filter segment 2R of the color separation filter 2. Further, the control circuit 5 applies a voltage signal of 2v (V) to the voice coil motor 11M and rotates the movable reflecting mirror 11 to the second position 2P while the DMD 3 is in the green display state in one frame. As a result, the emitted light from the lamp 1 is made incident on the green filter segment 2G of the color separation filter 2. Further, the control circuit 5 applies a voltage signal of 3v (V) to the voice coil motor 11M while the DMD 3 is in the blue display state in one frame, and rotates the movable reflecting mirror 11 to the third position 3P. As a result, the light emitted from the lamp 1 is made incident on the blue filter segment 2B of the color separation filter 2. Furthermore, the control circuit 5 applies a voltage signal of 4v (V) to the voice coil motor 11M to rotate the movable reflecting mirror 11 to the fourth position 4P while the DMD 3 is in the white display state in one frame. By moving the light, the light emitted from the lamp 1 enters the white filter segment 2W of the color separation filter 2.

  As can be understood from FIG. 4, in the data mode, the display period of red (R) and blue (B) of the three chromatic colors in each frame is compared with the other colors (green and white). Is getting shorter. Therefore, the period in which the movable reflecting mirror 11 is located at the first and third positions 1P and 3P is also shortened according to the display period of red (R) and blue (B). This is because the luminance is prioritized over the color tone in the data mode, and in addition to the addition of white light, the luminance is increased by shortening the red and blue display periods for decreasing the brightness.

  When the theater mode in which the control as shown in FIG. 3 is performed as described above is set, the filter segments 2R, 2G, and 2B other than those for white are used and the red display period is set to another color. As a result, the color reproducibility can be improved. On the other hand, when the data mode shown in FIG. 4 is set, the filter segments 2R, 2G, 2B, and 2W including white are used, and the red and blue display periods for reducing the brightness are shortened. Therefore, a projection image with high brightness can be obtained.

  The operation of the projector according to the present invention having the above-described configuration will be described below with reference to the flowcharts of FIGS. Needless to say, the processing shown in these flowcharts is executed by the control circuit 5 in accordance with a control program installed in the control circuit 5 itself.

  Normally, the control circuit 5 monitors whether or not an operation has been received due to the user operating the operation unit 6 (NO in step S11). When the operation is accepted by the operation of the operation unit 6 by the user (YES in step S11), the control circuit 5 determines whether or not it is an instruction of “mode setting” (step S12). When another instruction that is not “mode setting” is received (NO in step S12), the control circuit 5 executes another process corresponding to the received instruction (step S13), and returns the process to step S11.

  When an instruction of “mode setting” is received (YES in step S12), the control circuit 5 determines whether “automatic mode” is instructed or “manual mode” is instructed, and “automatic mode” is instructed. If so, the control circuit 5 instructs the video discrimination circuit 10 that the “automatic mode” has been set. On the other hand, when “manual mode” is instructed, the control circuit 5 determines whether “theater mode” or “data mode” is designated, and instructs the image discriminating circuit 10 about the designated mode (step) S15).

  When the “automatic mode” is instructed, the video discriminating circuit 10 discriminates the video signal because the control circuit 5 instructs the video discriminating circuit 10 that the “automatic mode” has been set (step S14). FIG. 6 is a flowchart showing the procedure of “video mode discrimination” processed by the video discrimination circuit 10. The procedure of “video mode discrimination” is processed by the video discrimination circuit 10 in accordance with a program installed in the video discrimination circuit 10 in advance.

  In the “video mode discrimination” process, the video discrimination circuit 10 first determines whether or not a video signal is input from the input terminal 9 (step S31). If no video signal is input (step S31). NO), and waits until a video signal is input. When a video signal is input from the input terminal 9 (YES in step S31), the video discrimination circuit 10 discriminates the synchronization signal of the video signal, specifically, by counting the frequency of the horizontal and vertical synchronization signals. A determination is made (step S32). Since the technique for discriminating both frequencies of the synchronization signal of such a video signal is well known, description thereof is omitted.

  When the horizontal frequency and the vertical frequency are determined by discriminating the synchronizing signal of the video signal input from the input terminal 9, the video discriminating circuit 10 preliminarily incorporates various types of video signals, the horizontal frequency and the vertical frequency. Based on the table indicating the relationship with the frequency, the type of the video signal input from the input terminal 9 is determined (step S33). As a result, if the video signal input from the input terminal 9 is a video signal output from a computer, for example, VGA (640 × 480) to UXGA (1600 × 1200), it is determined that the mode is “data mode”. The If the video signal input from the input terminal 9 is a TV broadcast video signal or a playback video signal from a DVD, such as HDTV (1920 × 1080 or 1280 × 720), NTSC, PAL, etc., “Theater Mode ".

  As described above, when it is determined whether the video signal input from the input terminal 9 is “data mode” or “theater mode”, the process is returned to the main routine of FIG. The signal is supplied from the video discrimination circuit 10 to the control circuit 5. When it is determined that the “theater mode” is set, the control circuit 5 uses only the other three chromatic color filter segments 2R, 2G, and 2B excluding the white one from the filter segments shown in FIG. Control is performed (step S16). On the other hand, when it is determined that the mode is the “data mode”, the control circuit 5 performs control to use all the filter segments 2R, 2G, 2B, 2W including those for white as shown in FIG. 3 (step S17). ).

  On the other hand, when the user instructs “manual mode”, the control circuit 5 further accepts designation of “theater mode” or “data mode”. Therefore, when the user designates “manual mode” and designates “theater mode”, the control circuit 5 performs the control in step S16 as described above. When the user designates “manual mode” and designates “data mode”, the control circuit 5 performs the control of step S17 as described above.

  When the control circuit 5 performs the control in step S16, the voice coil motor 11M performs the control as shown in FIG. 3, so that the emitted light from the lamp 1 is the filter segment of each chromatic color other than the one for the color separation filter 2. 2R, 2G, and 2B are sequentially transmitted during one frame of the video signal and incident on the DMD 3. Accordingly, the digital image data input from the input terminal 9 and applied to the DMD 3 is projected as an image having good color reproducibility.

  On the other hand, when the control circuit 5 performs the control in step S17, the voice coil motor 11M performs the control as shown in FIG. 4, so that the emitted light from the lamp 1 is all the filter segments 2R, 2G, 2B including those for white. , 2W are sequentially transmitted during one frame of the video signal and incident on the DMD 3. Accordingly, the digital image data input from the input terminal 9 and applied to the DMD 3 is projected as a high-luminance image although the color reproducibility is slightly inferior.

  By the way, in the projector according to the present invention, adjustment of image quality, specifically, adjustment for each color and adjustment of brightness can be performed very easily. That is, a specific chromatic color display period can be easily performed between each frame of the video signal as compared with the case where the light emitted from the lamp 1 is separated into light of each color using a conventional color wheel. Adjustable without being restricted by the wheel rotation speed, it is easy to adjust the brightness of each color individually, and the white display period can be easily adjusted, so the brightness of the entire image can be adjusted. It is also easy to do.

  For example, if “image quality adjustment” is instructed in step S12 shown in the flowchart of FIG. 5, “image quality adjustment” processing is executed in step S13. FIG. 7 is a flowchart showing a processing procedure performed by the control circuit 5 at that time. Needless to say, the processing shown in this flowchart is executed by the control circuit 5 in accordance with a control program installed in the control circuit 5 itself.

  First, the control circuit 5 displays an image quality adjustment screen on a display device provided in the operation unit 6 or projects an image quality adjustment screen using an OSD (On Screen Display) function (step S21). This image quality adjustment screen is a screen whose schematic diagram is shown in FIG. 8, and in this embodiment, any one of “red”, “green”, “blue” and “brightness” desired by the user is selected. And can be adjusted. FIG. 8 shows a default state in which all adjustment values are “± 0”.

  When the user selects “red” on this image quality adjustment screen and adjusts it to any value (YES in step S22), the control circuit 5 temporarily stores the red adjustment value (step S27). When the user selects “green” and adjusts it to any value (YES in step S23), the control circuit 5 temporarily stores the green adjustment value (step S28). When the user selects “blue” and adjusts it to any value (YES in step S24), the control circuit 5 temporarily stores the blue adjustment value (step S29). Further, when the user selects “brightness” and adjusts it to any value (YES in step S25), the control circuit 5 temporarily stores it as a white adjustment value (step S30). The adjustment value of each color temporarily stored as described above is given to the control circuit 5.

  When the user selects “END” on the image quality adjustment screen (NO in steps S22, S23, S24, and S25, YES in S26), the control circuit 5 returns the process to the main routine shown in FIG. If “NO” in any of steps S22 to S26, the control circuit 5 returns the process to step S21 and waits for an instruction from the user. Although not shown in the flowchart, when the user selects “Reset”, the mode set at that time, specifically, the default of the theater mode or the data mode shown in FIGS. 3 and 4 respectively. The state of each color and brightness is returned to the state.

  In the above-described embodiment, the color separation filter 2 is configured to have filter segments 2R, 2G, 2B, and 2W for white and three kinds of chromatic colors. This is used in the data mode as described above. This is a configuration that takes into account. Accordingly, when the use in the data mode is not considered, the color separation filter 2 having only the chromatic color filter segments 2R, 2G, and 2B may be used.

  In the above embodiment, the chromatic color segments of the color separation filter 2 are three colors of red, green, and blue. However, the present invention is not limited to this. For example, cyan, magenta, and yellow may be used. Alternatively, six colors of three colors of red, green, and blue and three colors of cyan, magenta, and yellow may be used.

It is a schematic diagram showing a configuration example of a main part of an embodiment of a projector according to the present invention. FIG. 4 is a schematic diagram showing a state in which light emitted from a lamp for viewing one configuration example of a color separation filter of a projector according to the present invention is viewed in a direction along an optical path incident on a color separation filter. It is a timing chart which shows the state of the standard position control of a movable reflecting mirror when using the filter segment for white of the color separation filter of the projector which concerns on this invention. It is a timing chart which shows the state of the standard position control of a movable reflecting mirror when not using the filter segment for white of the color separation filter of the projector which concerns on this invention. It is a flowchart which shows the procedure of operation | movement of the projector which concerns on this invention. It is a flowchart which shows the procedure of operation | movement of the projector which concerns on this invention. It is a flowchart which shows the process sequence when the image quality adjustment of the projector which concerns on this invention is instruct | indicated. It is a schematic diagram showing an image quality adjustment screen displayed when an image quality adjustment of the projector according to the present invention is instructed.

Explanation of symbols

1 lamp 2 color separation filter 3 DMD
5 Control Circuit 6 Operation Unit 9 Input Terminal 10 Image Discriminating Circuit 11 Movable Reflector 11M Voice Coil Motor 15 Condenser Lens 2R, 2G, 2B, 2W Filter Segment

Claims (12)

A light source that emits white light, spatial light modulation means that sequentially converts the emitted light from the light source into modulated light that represents a plurality of chromatic components constituting the image, the light source, and the spatial light modulation means, In the projector, the color separation means for separating the light emitted from the light source into the plurality of chromatic colors in synchronization with the timing at which the spatial light modulation means sequentially converts into a plurality of chromatic colors,
The color separation means has a plurality of filter segments that respectively transmit the plurality of chromatic light.
Optical path switching between the light source and the spatial light modulation means for switching the optical path of the emitted light from the light source so as to pass through each of the plurality of filter segments of the color separation means and reach the spatial light modulation means A projector comprising means.   The light path switching means adjusts the time during which the light emitted from the light source passes through each of the plurality of filter segments, thereby adjusting the intensity of the chromatic component of the image represented by the modulated light converted by the spatial light modulation means. The projector according to claim 1, further comprising control means for adjusting. The plurality of filter segments of the color separation means are arranged in a straight line,
The optical path switching means includes an optical optical path switching means for switching an optical path of light emitted from the light source in a direction of each of a plurality of filter segments arranged linearly of the color separation means, and a plurality of filters of the color separation means. The projector according to claim 1, further comprising: an optical path conversion unit that directs an optical path of light transmitted through each segment toward the spatial light modulation unit. A light source that emits white light, spatial light modulation means for sequentially converting the emitted light from the light source into modulated light representing a plurality of chromatic components constituting the image and modulated light representing white, and the light source, A color that is separated into the plurality of chromatic colors and white in synchronization with the timing at which the spatial light modulation means sequentially converts the light emitted from the light source to the plurality of chromatic colors and white with the spatial light modulation means. In a projector provided with a separating means,
The color separation means has a plurality of filter segments that respectively transmit the plurality of chromatic colors and white light,
Optical path switching between the light source and the spatial light modulation means for switching the optical path of the emitted light from the light source so as to pass through each of the plurality of filter segments of the color separation means and reach the spatial light modulation means A projector comprising means.   The light path switching means adjusts the time for the light emitted from the light source to pass through each of the plurality of filter segments, so that the intensity of the chromatic color component of the image represented by the modulated light converted by the spatial light modulation means and 5. The projector according to claim 4, further comprising control means for adjusting brightness. The plurality of filter segments of the color separation means are arranged in a straight line,
The optical path switching means includes an optical optical path switching means for switching an optical path of light emitted from the light source in a direction of each of a plurality of filter segments arranged linearly of the color separation means, and a plurality of filters of the color separation means. The projector according to claim 4, further comprising: an optical optical path conversion unit that directs an optical path of light transmitted through each segment toward the spatial light modulation unit. A discriminating unit for discriminating at least two types of images in which the spatial light modulator converts the emitted light from the light source into modulated light;
In accordance with a determination result by the determination unit, a first control that transmits only the filter segment that transmits the chromatic color of the color separation unit, and the chromatic color light and the white light are transmitted. The projector according to claim 6, further comprising: a control unit that performs any one of the second control for transmitting the filter segment. One of the two types of images determined by the determining means is a computer monitor output image,
The projector according to claim 7, wherein the control unit performs the second control when an image discrimination result by the discrimination unit is an image output from a monitor of a computer.   The projector according to claim 1, wherein the chromatic colors are red, green, and blue.   The projector according to claim 1, wherein the chromatic colors are cyan, magenta, and yellow.   9. The projector according to claim 1, wherein the chromatic colors are red, green, blue, cyan, magenta, and yellow.   The projector according to claim 1, wherein the chromatic colors are red, green, and blue, and cyan and / or magenta and / or yellow.

Images