JP4548268B2 - Projector device - Google Patents

Description

  The present invention relates to a projector device that projects an image and displays it on a screen, for example.

2. Description of the Related Art Conventionally, a projector that modulates a light beam emitted from a light source using a light modulator such as DMD (Digital Micromirror Device: registered trademark) and enlarges and projects the modulated light beam on a screen using a projection lens. The device is known. In this type of projector apparatus, a white discharge lamp such as an ultra-high pressure mercury lamp or a xenon lamp is used as a light source (see, for example, Patent Document 1). However, projector devices generally project red (R), green (G), and blue (B) images corresponding to the three primary colors in a time-division manner during one frame, and use white light as a light source. In such a case, it is necessary to insert a filter member for dividing the white light into three colors of R, G, and B between the light source and the light modulator, resulting in a problem that the apparatus configuration becomes complicated. there were.
Therefore, conventionally, a projector device has been proposed in which a light source is configured by including light emitting diodes of red, green, and blue (see, for example, Patent Document 2).
JP 2005-148298 A JP 2003-186110 A

However, in the conventional technology using light emitting diodes of red, green, and blue as light sources, a cross dichroic prism is used to synthesize light emitted from each light emitting diode, and the three surfaces of this cross dichroic prism are used. Since one light-emitting diode is arranged opposite to each other on each surface, it is difficult to align the optical axes of the respective light-emitting diodes coaxially when the light-emitting diodes are arranged in the projector apparatus. was there.
SUMMARY An advantage of some aspects of the invention is that it provides a projector device that does not require optical axis alignment in a light source.

In order to achieve the above object, the present invention includes a light modulator that modulates light emitted from a light source based on image data, and a projection optical system that magnifies and projects the light modulated by the light modulator. In the projector device, the light source is composed of a stacked light emitting diode device configured to be connectable so as to emit light in the same direction for each of the reflection type light emitting diode units of at least red light, green light, and blue light , Each of the reflection type light emitting diode units has a cylindrical holder case having both ends opened, and a light emitting element and a dichroic mirror disposed opposite to each other in the holder case, and the light emitted from the light emitting element is transmitted to the dichroic A mirror reflects and is emitted coaxially with the holder case from one opening of the holder case, Each of the holder case Aether unit coupled coaxially, characterized by being configured the stacked-type light-emitting diode device.

  Further, the present invention is characterized in that, in the above invention, each of the reflective light emitting diode units is connected to each other through a connecting member that is connected so that the optical axes are coaxial.

  According to the present invention, in the above invention, at least two of the reflective light emitting diode units of red light, green light, and blue light are simultaneously turned on to project an image of a color other than red, green, and blue. It is characterized by doing.

  Further, the present invention is characterized in that, in the above-described invention, the multilayer light emitting diode device further includes a reflection type light emitting diode unit that emits light other than red light, green light, and blue light.

  According to the present invention, as the light source, a stacked type light emitting diode device in which at least each of the reflection type light emitting diode units of red light, green light and blue light is connected so as to emit light in the same direction is used. When arranging the light source in the projector device, the work for aligning the optical axes of the reflection type light emitting diode units becomes unnecessary.

Embodiments of the present invention will be described below with reference to the drawings.
[First embodiment]
FIG. 1 is a diagram schematically showing a configuration of a projector apparatus 200 showing an embodiment of the present invention. As shown in this figure, the projector device 200 includes a stacked light emitting diode device 100 as a light source that emits a light beam, a two-dimensional light modulator 110 that modulates the light beam, and a light beam emitted from the stacked light emitting diode device 100. Irradiating optical system 120 that guides the light to the two-dimensional light modulator 110, a projection optical system 130 that projects the modulated light beam modulated by the two-dimensional light modulator 110, and a control device 140 that controls the operation of the projector device 200. It has.

  The stacked light emitting diode device 100 selectively selects red light (R), green light (G), and blue light (B) corresponding to the three primary colors, or several color lights (including all color lights) simultaneously. It is to be ejected. Specifically, the multilayer light emitting diode device 100 includes a reflective light emitting diode unit 10A that emits red light (R: wavelength 660 nm), a reflective light emitting diode unit 10B that emits green light (G: wavelength 525 nm), and blue ( B: a reflection type light emitting diode unit 10C that emits a wavelength of 470 nm), and these reflection type light emitting diode units 10A to 10C are connected in series so as to emit light beams in the same direction. Under the control of the above, each color light is selectively emitted or some color lights (including the case of all color lights) are emitted. A specific configuration of the multilayer light emitting diode device 100 will be described in detail later.

  The two-dimensional light modulator 110 modulates the light beam emitted from the multilayer light emitting diode device 100 based on the control of the control device 140, and causes the modulated light beam to enter the projection optical system 130. In this case, a DMD is used as the two-dimensional optical modulator 110. More specifically, in the DMD, each pixel arranged two-dimensionally is composed of micron-sized micromirrors, and the tilt of the micromirrors is controlled for each pixel to change the reflection angle of the reflected light from the micromirrors. Thus, an on / off state is created, and only light reflected in a predetermined direction enters the projection optical system 130 and is projected as a projected image. At this time, one pixel is in charge of one pixel of the projected image, and the control device 140 executes on / off control (angle control) of the micromirror of each pixel based on the image data to be projected.

  The irradiation optical system 120 is disposed between the multilayer light emitting diode device 100 and the two-dimensional light modulator 110, and the light beam emitted from the multilayer light emitting diode device 100 is applied to the entire reflection region of the two-dimensional light modulator 110. Irradiate with a uniform amount of light. Specifically, the irradiation optical system 120 includes a plurality of fly array lenses 121 for dispersing the luminance (light quantity) of the light beam emitted from the multilayer light emitting diode device 100, and the light beam that has passed through these fly array lenses 121. And a pair of reflecting mirrors 123 and 124 for guiding the light beam that has passed through the condensing lens 122 to the reflecting region of the two-dimensional light modulator 110. The configuration of the irradiation optical system 120 is arbitrary as long as it can irradiate the entire surface of the reflection region of the two-dimensional light modulator 110 with a uniform amount of light emitted from the multilayer light emitting diode device 100. It is possible to adopt a configuration.

  The projection optical system 130 enlarges and projects the light beam modulated by the two-dimensional light modulator 110 toward the screen 400 disposed in front of the projector device 200. In the R, G, and B color lights, the projection optical system 130 In order to prevent the projected image from becoming unclear due to chromatic aberration or the like, the lens is configured as a combined lens in which a plurality of condensing elements are arranged in the optical axis direction.

  The control device 140 includes a light emission control unit 141 that controls light emission of the multilayer light emitting diode device 100 and a two-dimensional light modulator control unit 142 that controls the two-dimensional light modulator 110. The light emission control unit 141 outputs lighting control signals Cm-r, Cm-g, and Cm-b to the reflection type light emitting diode units 10A to 10C, and sequentially outputs each of the reflection type light emitting diode units 10A to 10C at predetermined intervals. It is to light up.

The two-dimensional light modulator control unit 142 also outputs image data output from a computer 300 (which may be another electronic device having an image output function such as a digital video camera) connected to the projector apparatus 200. Based on the above, the modulation control signal Cm-d is output to the two-dimensional optical modulator 110, the on / off of each micromirror is controlled, and the light beam emitted from the multilayer light emitting diode device 100 is modulated. is there.
The two-dimensional light modulator control unit 142 controls the two-dimensional light modulator 110 in synchronization with the light emission control of the light emission control unit 141, and details thereof will be described later.

As described above, in the present embodiment, the multilayer light emitting diode device 100 is used as a light source, and the configuration of the multilayer light emitting diode device 100 will be described in detail below.
FIG. 2 is a schematic view showing the front and side surfaces of the multilayer light emitting diode device 100, and FIG. 3 is a schematic side cross-sectional view thereof.
As shown in FIG. 3, each of the reflective light emitting diode units 10 </ b> A to 10 </ b> C of the multilayer light emitting diode device 100 includes a light emitting diode 2 that is a light emitting semiconductor element, a lead frame 1 that supports the light emitting diode 2, and a light emitting diode 2. A dichroic mirror 3 that is a reflecting mirror disposed opposite to the light emitting surface 2A and a connecting member 4 that is connected to the reflection type light emitting diode unit 10 in the subsequent stage are provided, and these have a cylindrical shape (or a cylindrical shape having a square cross section). It is installed in the holder case 5. The holder case 5 is made of a metal material having high thermal conductivity such as aluminum, and a heat radiating portion 5C having a large number of heat radiating fins 7 is formed on the outer peripheral surface (outer surface) thereof.

  As shown in FIG. 2, the lead frame 1 includes an annular portion 1A, a substantially disc-shaped mounting portion 1B disposed at the center of the annular portion 1A, and the light emitting diode 2 disposed on the back surface thereof. Three arm portions 1C extending from the annular portion 1A toward the attachment portion 1B are provided, and these are integrally formed by, for example, die-cutting a plate material having high thermal conductivity such as copper. Then, as shown in FIG. 3, the lead frame 1 is hooked on a hooking piece 5 </ b> A provided on the inner peripheral surface of the holder case 5 with the light emitting diode 2 (light emitting surface 2 </ b> A) facing the back side. The At this time, the heat generated by the light emitting diode 2 is transmitted to the holder case 5 because the side peripheral surface of the annular portion 1 </ b> A of the lead frame 1 is in close contact with the inner side surface of the holder case 5.

  The dichroic mirror 3 has a concave optical reflection surface 3A that selectively reflects only light in a specific wavelength band and transmits light in other wavelength bands. A focal length adjusting spacer 8 is interposed in the holder case 5 so as to face the light emitting surface 2A. The optical reflecting surface 3A has a high reflection characteristic with respect to the radiation wavelength of the light emitting diode 2 arranged opposite to the optical reflecting surface 3A. It is formed as an aspherical surface. Therefore, in each of the reflection type light emitting units 10A to 10C, the light emitted from the light emitting diode 2 is reflected as light substantially parallel to the central axis N, and the opening 5D on the front side of the holder case 5 is directed to the central axis N. The light is emitted as a substantially parallel light beam. Note that the reflective light emitting unit 10C located at the last stage may have a configuration in which a normal concave mirror is provided instead of the dichroic mirror 3 because no light enters from the latter stage.

  The focal length adjusting spacer 8 is a resin member for adjusting the focal position of the optical reflecting surface 3 A of the dichroic mirror 3, and the focal length adjusting spacer 8 is interposed between the lead frame 1 and the dichroic mirror 3. Thus, even if the dimensions of the light emitting diode 2, particularly the height of the LED chip, varies depending on the manufacturer and its structure (bare chip, surface mount type chip, etc.), the light emitting diode 2 (light emitting surface 2A) The distance to the optical reflecting surface 3A (focal length f) is adjusted, and the focal position can be aligned with the arrangement position of the light emitting diode 2.

The connecting member 4 is formed of an electrically insulating material such as a resin in a cylindrical shape, and as shown in FIG. 3, one end 4 </ b> A is a light flux from the opening 5 </ b> B on the back side of the holder case 5 toward the rear. Is installed in the holder case 5 so as to extend substantially parallel to the injection direction P of the. Then, one end 4A of the connecting member 4 is inserted into the opening 5D on the front side of the holder case 5 of the reflection type light emitting diode unit 10 connected in the subsequent stage, and is hooked on the hook portion 5A of the holder case 5, so that the reflection type The light emitting diode unit 10 is connected.
At this time, since the connecting member 4A extends substantially parallel to the emission direction P of the light beam, the emitting direction of the reflection type light emitting diode unit 10 connected to the subsequent stage with the connecting member 4A is matched with that of the preceding stage. Accordingly, the optical axes of the respective reflective light emitting diode units 10A to 10C can be easily and easily aligned.

Next, the operation of the projector device 200 will be described. In the following description, it is assumed that the number of frames of images displayed by projector device 200 per second is 60 frames.
When projecting an image of one frame, the projector apparatus 200 converts an R plane, a G plane, and a B plane obtained by separating the image into R, G, and B colors in one frame (1/60 seconds). The images are sequentially projected onto the screen 400 in a time-sharing manner so that humans can visually recognize each image by color synthesis.

  Specifically, as shown in FIG. 4, one frame is divided into three to provide an R lighting period Tr, a G lighting period Tg, and a B lighting period Tb, and the light emission control unit 141 is predetermined in the R lighting period Tr. By supplying a lighting control signal Cm-r subjected to voltage or predetermined PWM control to the reflective light emitting diode unit 10A, red light is emitted, and in the same manner, green light and B light are emitted during the G lighting period Tg. In the period Tb, blue light is emitted in a time division manner. Therefore, the light of each color of R, G, B is sequentially emitted at a period (1/180 seconds) three times as long as one frame.

On the other hand, in the R lighting period Tr, the two-dimensional light modulator control unit 142 outputs the modulation control signal Cm-d to the two-dimensional light modulator 110 based on the R plane indicating the R component of the image data to be projected. Thus, only the R component image is projected on the screen 400 during the R lighting period Tr. Similarly, an image of only the G component is projected in the lighting period Tg, and an image of only the B component is projected in the B lighting period Tb. As a result, images of R, G, and B color components are sequentially projected during one frame, and images of the respective color components are color-synthesized and viewed by humans.
In addition, when adjusting the brightness | luminance of a projection image, each voltage value of lighting control signal Cm-r, Cm-g, Cm-b which the light emission control part 141 supplies to each reflection type light emitting diode unit 10A-10C or The amount of light emitted from each of the reflective light emitting diode units 10A to 10C is controlled by changing the PWM control value (pulse width or the like).

  Here, in the present embodiment, as the image projection mode of the projector device 200, in addition to the above-described mode of projecting an image with only the three colors R, G, and B, an intermediate color formed by appropriately combining these R, G, and B In addition to the three colors of R, G, and B, an intermediate color use mode for projecting an image is provided. In the following description, as an intermediate color, R and G are simultaneously turned on to display yellow, but other intermediate colors and white light may be displayed.

  FIG. 5 is a timing chart of the intermediate color use mode. As shown in this figure, in the intermediate color use mode, an intermediate color light emission period Tc for displaying an intermediate color is newly added to one frame. In the intermediate color light emission period Tc, the light emission control unit 141 emits R and G at the same time and emits yellow light from the multilayer light emitting diode device 100. At this time, if the emission intensities of R and G are equal to those in the case of monochromatic emission, the intensity of yellow light will be higher than that of other color lights. The voltage value or the PWM control value is made smaller than that in the case of monochromatic light emission, so that the light emission intensities of the intermediate color and the monochromatic color are approximately the same.

In addition, the control device 140 receives data of the R plane, the G plane, the B plane, and the intermediate color plane obtained by separating the image displayed during one frame into R, G, B, and intermediate color components. In the intermediate color emission period Tc, the two-dimensional light modulator control unit 142 controls the modulation of the two-dimensional light modulator 110 based on the intermediate color plane data.
With the control as described above, images of R, G, B, and intermediate color components are sequentially projected during one frame, compared with a case where an image is projected with three colors of R, G, and B. An image with a wide color reproduction range is projected.
In addition, by further adding a light emission period for displaying other intermediate colors during one frame, a plurality of intermediate colors can be projected, and the color reproduction range can be further expanded.

  As described above, according to the present embodiment, the reflective light emitting diode unit 10A that emits red light, the reflective light emitting diode unit 10B that emits green light, and the reflective light emitting diode unit 10C that emits blue light. The multilayer light emitting diode device 100 that is connected to emit light in the same direction is used as the light source. Therefore, when the light source is disposed in the projector device 200, the reflective light emitting diode unit is used. The operation | work for aligning each optical axis of 10A-10C becomes unnecessary. In addition, since each of the reflection type light emitting diode units 10A to 10C is connected and integrated, even if an impact or the like is applied to the projector device 200, each of the reflection type light emitting diode units 10A to 10C is disposed at each arrangement position. Variations do not occur.

  Further, according to the present embodiment, each of the reflection type light emitting diode units 10A to 10C is provided with the connecting member 4 for connecting the other reflection type light emitting diode units 10 so that the optical axes are coaxial. Therefore, it is easy and easy to align the optical axes when assembling the multilayer light emitting diode device 100 by connecting each of the reflective light emitting diode units 10A to 10C.

  Further, according to the present embodiment, since at least two of the reflective light emitting diode units 10A to 10C are turned on at the same time to project an intermediate color image other than red, green, and blue, color reproduction is performed. A vivid projected image with an expanded area can be obtained.

  Further, according to the present embodiment, the reflection type light emitting diode units 10A to 10C having the hollow holder case 5 made of metal having high thermal conductivity are connected through the connecting member 4 made of an electrically insulating material. Since it was set as the structure, while being able to raise the heat dissipation of the light emitting diode 2, high output is attained, and the electrical insulation of reflection type light emitting diode unit 10A-10C can be improved.

  In addition, according to the present embodiment, the light emitting diode 2 is attached to the lead frame 1 made of a high thermal conductivity material, and the lead frame 1 is attached to the holder case 5, so that the heat generated by the light emitting diode 2 is lead. It can be transmitted to the holder case 5 via the frame 1 and efficiently radiated from the holder case 5. In particular, according to the present embodiment, since the heat radiating fins 5B are formed on the outer surface of the holder case 5, the heat dissipation can be further improved. In addition, by disposing a fan that blows cooling air to the multilayer light emitting diode device 100 in the projector device 200, it is possible to further improve heat dissipation.

[Second Embodiment]
In the first embodiment described above, the plurality of reflective light emitting diode units 10A to 10C included in the multilayer light emitting diode device 100 are individually or simultaneously turned on, and are expressed within the range shown in the xy chromaticity diagram of FIG. The image was projected using light of a certain color. On the other hand, in this embodiment, as shown in FIG. 7, in addition to the reflective light emitting diode units 10A to 10C, light different from each of R, G, and B (hereinafter referred to as “other color light”) is used. The stacked light emitting diode device 100A formed by further connecting the light emitting diode units 10D that emit light is used as a light source to project an image.

  That is, in the projector apparatus 200 ′, as shown in the xy chromaticity diagram of FIG. 8, the image is expressed using colors expressed within the range synthesized by the four colors of the reflective light emitting diode units 10A to 10D. I am letting. Specifically, as shown in FIG. 9, during one frame, an R light emission period Tr for lighting red light, a G light emission period Tg for lighting green light, a B light emission period Tb for lighting blue light, and other color lights. The four other light emitting periods Tc for turning on are provided, and the four reflective light emitting diode units 10A to 10D are sequentially turned on for each period.

  As described above, according to the present embodiment, a reflective light emitting diode unit 10D that emits light other than red light, green light, and blue light is further connected to the multilayer light emitting diode device 100, thereby The color image can be easily displayed, and the color reproduction range can be easily expanded.

In particular, according to the present embodiment, since the multilayer light emitting diode device 100 is used as a light source, the color of other colors is different from that of a conventional projector device that arranges a light source around a cross dichroic prism and performs color composition. It becomes possible to easily add the reflection type light emitting diode unit 10 as a light source.
In the present embodiment, the configuration in which only one reflection type light emitting diode unit 10D that emits different colors is added is illustrated, but the present invention is not limited to this, and a plurality of reflection type light emitting diode units that emit light of different colors. 10 may be connected to the reflective light emitting diode units 10A to 10C to constitute a stacked light emitting diode device capable of realizing a wider color reproduction range.

Each embodiment described above shows only one aspect of the present invention, and can be arbitrarily modified and applied within the scope of the present invention.
For example, in the above-described embodiment, the holder case 5 may be configured to be filled with an inert gas, and the light-emitting diode 2 or the like may be prevented from being deteriorated due to corrosion or the like.

It is a schematic diagram which shows the structure of the projector apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the front and side of a multilayer type light emitting diode apparatus. It is sectional drawing of a laminated type light emitting diode apparatus. It is a timing chart which shows the projection operation | movement of a projector apparatus. It is a timing chart which shows the projection operation at the time of the intermediate color use mode of a projector apparatus. It is an xy chromaticity diagram showing a range of colors that can be expressed by the projector device according to the first embodiment of the present invention. It is a schematic diagram which shows the structure of the projector apparatus which concerns on 2nd Embodiment of this invention. It is an xy chromaticity diagram showing a range of colors that can be expressed by the projector device according to the second embodiment of the present invention. It is a timing chart which shows the projection operation | movement of the projector apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lead frame 2 Light emitting diode 3 Dichroic mirror 4 Connection material 5 Holder case 10, 10A-10D Reflection type light emitting diode unit 100, 100 'Stack type light emitting diode apparatus 110 Two-dimensional light modulator 130 Projection optical system 140 Control apparatus 200, 200 '' Projector device

Claims (4)

In a projector apparatus having an optical modulator that modulates light emitted from a light source based on image data, and a projection optical system that enlarges and projects the light modulated by the optical modulator,
The light source is composed of a stacked type light emitting diode device configured to be connectable so as to emit light in the same direction to each of the reflection type light emitting diode units of at least red light, green light and blue light ,
Each of the reflective light emitting diode units is
A cylindrical holder case having both ends opened, and a light emitting element and a dichroic mirror disposed opposite to each other in the holder case, and the dichroic mirror reflects light emitted from the light emitting element so that the holder case Injected coaxially with the holder case from one opening,
A projector apparatus, wherein the multilayer light emitting diode device is configured by coaxially connecting holder cases of the reflective light emitting diode units . The projector apparatus according to claim 1, wherein each of the reflective light emitting diode units is connected to each other via a connecting member that is connected so that the optical axes are coaxial. 2. An image of a color other than red, green, and blue is projected by simultaneously turning on at least two of the reflection type light emitting diode units of red light, green light, and blue light. Or the projector apparatus of 2. The projector according to claim 1, wherein the multilayer light emitting diode device further includes a reflection type light emitting diode unit that emits light other than red light, green light, and blue light.

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