JP2005181421A - Light source device and projector equipped with the light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device, equipped with a light-emitting element and capable of emitting natural luminous flux. <P>SOLUTION: The light source device 8R constituted by arranging a plurality of light-emitting elements for emitting the luminous flux regarded as single wavelength on a base plate 81 is equipped with several kinds of light-emitting elements 83R1 to 83R6 which emit luminous flux having different wavelengths. The number of light-emitting elements 83R1 to 83R6 is set according to the spectral distribution of transmitted luminous flux through a light transmissive filter, used for a image display device and transmitting the luminous flux in a prescribed wavelength region or the spectral distribution of the emitted luminous flux from a light source used for the picture display device, and the light-emitting elements are arranged on the base plate 81 at random. The luminous flux, where the emphasis of primary colors is restrained, can be emitted by the light source device 8R. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a light source device configured by arranging a plurality of light emitting elements for emitting a light beam that can be regarded as a single wavelength on a substrate, and a projector including the light source device.

  Conventionally, projectors are used for presentations at conferences, academic conferences, exhibitions, etc., and for watching movies at home. Such a projector modulates a light beam emitted from a light source device provided in an exterior case according to image information to form an optical image, and enlarges and projects this optical image. In recent years, as a light source of such a projector, a light emitting element having a long life and high photoelectric conversion efficiency can be adopted as compared with a discharge light source typified by a xenon lamp, a halogen lamp, a high pressure mercury lamp and the like. Has been studied.

  As a projector using such a light emitting element, a projector using a light emitting diode is known (for example, see Patent Document 1). In this projector, red (R), green (G), and blue (B) light emitting diodes are used, and light beams (R), light beams (G), and light beams (B) emitted from the respective light emitting diodes are combined. An optical image is formed by irradiating a liquid crystal light valve (LCD) disposed downstream of the optical path with a single light beam. In such a projector, on the one hand, maintenance such as bulb replacement can be made unnecessary, and on the other hand, the amount of heat generated during light beam irradiation can be reduced, and the cooling structure inside the projector can be simplified.

JP 2001-42431 A

However, in the projector described in Patent Document 1, the light beam emitted from each light-emitting diode has a single wavelength and has a wide wavelength region separated by a conventional filter or the like, a high-pressure mercury lamp, or the like Therefore, even if the optical image is formed from the red, green, and blue color light emitted from each light emitting diode, and these optical images are combined, the primary color is the same. There is a problem that the color tone of the formed optical image becomes unnatural, such as being emphasized.
In addition, for such an image to be displayed, there is a method in which a control unit in which software for adjusting the color tone of an optical image is installed is arranged inside the projector, and fine color matching is performed using this software. It is done. However, in such a method, it is necessary to actually display an optical image by a projector and to control the adjustment degree by software, and the time required for such software development becomes long, resulting in a cost increase. There is a problem.
For this reason, there is a need for a light source device that does not require color matching by software and emits a light beam whose primary color is not emphasized in an optical image formed by the light beam emitted from the light emitting element.

  An object of the present invention is to provide a light source device that includes a light emitting element and can emit a natural light beam.

  A light source device of the present invention is a light source device configured by arranging a plurality of light emitting elements that emit light beams that can be regarded as a single wavelength on a substrate, and includes a plurality of types of light emitting elements that emit light beams of different wavelengths, and an image Each type of light-emitting element is used in a display device according to the spectral distribution of a transmitted light beam of a light-transmitting filter that transmits a light beam in a predetermined wavelength region or the spectral distribution of a light beam emitted from a light source used in the image display device. A number is set, and these are randomly arranged on the substrate.

  According to the present invention, the number of light emitting elements of a plurality of types that emit light beams having different wavelengths is equal to the spectrum of the transmitted light beam of a light transmissive filter used in an image display device or the emission light beam of a light source used in the image display device. Since it is set in accordance with the distribution, the spectral distribution of the emitted light beam of the light source device can be approximated to these spectral distributions. As a result, the light beam used for forming the optical image can be a light beam having a wide wavelength region, so that the color tone of the formed optical image becomes unnatural with the primary color emphasized. Can be suppressed. Therefore, it is possible to provide a light source device that emits a light beam that can emit a natural light beam having a wide wavelength region and can form an optical image with suppressed enhancement of primary colors.

In the present invention, it is preferable that a luminance distribution in a predetermined wavelength range of light beams emitted from the plurality of types of light emitting elements approximates a Gaussian distribution.
According to the present invention, the color rendering properties of an optical image formed using this light beam can be improved by approximating the luminance distribution in a predetermined wavelength region of the light beam emitted from various light emitting elements to a Gaussian distribution. Here, when a light beam emitted from a light source device is used to form an optical image like a projector, an optical image showing a natural color can be formed by using a light beam having a Gaussian distribution-like luminance distribution. . Therefore, by using the light beams emitted from these light emitting elements for the formation of an optical image, it is possible to further suppress the enhancement of primary colors in the optical image and to improve the color rendering of the optical image.

  Further, the light source device of the present invention is a light source device configured by arranging a plurality of light emitting elements that emit light beams that can be regarded as a single wavelength on a substrate, and includes a plurality of types of light emitting elements that emit light beams of different wavelengths. Each type of light emitting element is randomly arranged in an equal number on the substrate, and includes a luminance control unit that controls the light emission luminance of each light emitting element.

  According to the present invention, a plurality of types of light emitting elements that emit a light beam having a desired wavelength are randomly arranged in an equal number on the substrate, so that a light beam having a desired spectral distribution can be emitted, and luminance A light source device that emits a light beam having a desired wavelength characteristic can be configured by controlling the luminance of the light beam emitted from various light emitting elements by the control unit. Here, when the luminance control of the various light emitting elements is performed by the luminance control unit so that the emitted light beams of the various light emitting elements exhibit a Gaussian distribution-like luminance distribution, as described above, the light emission elements are formed using the emitted light beams. The optical color of the optical image can be made natural, and an unnatural display in which the primary colors are emphasized can be suppressed. Therefore, a light source device exhibiting a desired wavelength characteristic can be configured, and an optical image having a natural color tone can be formed by using an emitted light beam of the light source device.

In the present invention, it is preferable that the luminance control unit controls the number of times of light emission per unit time of the light emitting element.
According to the present invention, the luminance control unit can adjust the luminance of the light beam emitted from each light emitting element by controlling the number of times of light emission per unit time of the various light emitting elements. That is, if the number of times of light emission of a light emitting element per unit time is set low, the luminance of the emitted light beam of the light emitting element can be lowered. Conversely, if the number of light emission times is set high, the luminance of the emitted light beam is increased. be able to. Therefore, it is possible to easily adjust the wavelength characteristics of the emitted light beam of the light source device to the desired wavelength characteristics by adjusting the luminance of the emitted light beam of various light emitting elements.

Or in this invention, it is preferable that the said brightness | luminance control part controls the electric current or voltage which flows into the said light emitting element.
According to the present invention, since the brightness control unit controls the current or voltage that flows through the light emitting element, it is possible to adjust the brightness of the light beams emitted from the various light emitting elements. That is, if the current value or voltage value passed through the light emitting element is reduced, the luminance of the emitted light beam of the light emitting element can be lowered. Conversely, if the current value or voltage value is increased, the luminance of the emitted light beam can be increased. it can. Therefore, the wavelength characteristic of the light beam emitted from the light source device can be made easier to match the desired wavelength characteristic.

In this invention, it is preferable that the said board | substrate is a semiconductor wafer and the said light emitting element is an LED element.
According to the present invention, since the LED element has no theoretical lifetime, not only can the light source device be used semipermanently compared to the radiation light source, but also due to the lifetime as in the case of using a discharge light source. Maintenance such as bulb replacement can be eliminated. Moreover, since the LED element has a high photoelectric conversion rate, it is possible to reduce power consumption while maintaining a high light amount. Therefore, the use and versatility of the light source device can be improved.

  The projector according to the present invention includes a light source, a light modulation device that modulates a light beam emitted from the light source according to image information to form an optical image, and a projection optical system that magnifies and projects the formed optical image. A projector provided with the above-described light source device.

  According to the present invention, it is possible to achieve substantially the same operational effects as the light source device described above. That is, it is possible to display the formed optical image naturally. Further, when an LED element is used as the light emitting element, the amount of heat generated by light emission is small, so that the cooling structure of the light source device can be simplified, and consequently the structure inside the projector can be simplified.

[1. First Embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
(1) External Configuration FIG. 1 is a perspective view of a projector 1 according to the present embodiment as viewed from the upper front side. FIG. 2 is a perspective view of the projector 1 as viewed from the lower front side. FIG. 3 is a perspective view of the projector 1 as seen from the rear rear side. FIG. 4 is a perspective view showing a part of the outer case 2 of the projector 1.
The projector 1 modulates the light beam emitted from the light source according to the image information, and enlarges and projects it on a projection surface such as a screen. As shown in FIGS. 1 to 3, the projector 1 includes a substantially rectangular parallelepiped outer case 2 and a projection lens 3 exposed from the outer case 2.
The projection lens 3 has a function as a projection optical system for enlarging and projecting an optical image modulated and formed by a liquid crystal panel as a light modulation device to be described later, and a plurality of lenses are housed in a lens holding cylinder. It is configured as a combined lens.

The outer case 2 is a synthetic resin-made outer casing having a substantially rectangular planar shape, and houses the apparatus main body including the optical unit (described later) of the projector 1. The outer case 2 includes an upper case 21 that covers the upper part of the apparatus main body, a lower case 22 that covers the lower part of the apparatus main body, a front case 23 that covers the front part of the apparatus main body, and a part of the side part of the apparatus main body. And a rear case 25 (see FIG. 3) for covering the back portion of the apparatus main body.
Note that the corners of the top surface, front surface, side surface, bottom surface, and back surface of the exterior case 2 are formed in a curved surface.
The upper case 21 has a substantially rectangular upper surface portion 21A covering the upper part of the apparatus main body, a side surface portion 21B substantially hanging from one end portion in the long side direction of the upper surface portion 21A, and a long side direction of the upper surface portion 21A. A side surface portion 21C that substantially hangs down from the front portion of the other end portion of the other and a back surface portion 21D (see FIG. 3) that hangs down substantially from the rear end portion of the upper surface portion 21A.
As shown in FIG. 1 or FIG. 3, an operation panel 26 that performs the start-up / adjustment operation of the projector 1 is provided at a substantially central portion on the rear side of the upper surface portion 21A so as to extend in the left-right direction. When the operation button 261 on the operation panel 26 is appropriately pressed, the tact switch mounted on a circuit board (not shown) disposed inside the operation panel 26 is brought into contact with, and a desired operation can be performed. A light emitting diode (not shown) is attached to the circuit board so as to emit light according to a desired operation.
Further, the operation panel 26 includes a decorative plate 262 disposed so as to surround the operation button 261, and light from the light emitting diode is diffused through the decorative plate 262.

Further, from the front side (right side in FIG. 1) of the upper surface portion 21A, the projection lens 3 is moved up, down, left, and right to adjust the position of the projection lens 3 to constitute two projection lens position adjusting devices 30 (see FIG. 4). Dials 311 and 321 are exposed. When the dial 311 arranged on the left side of FIG. 1 is moved in the Y1 direction (downward) of the two dials 311 and 321, the projection lens 3 moves in the Y3 direction (downward), and the dial 311 moves in the Y2 direction (upward). When moved, the projection lens 3 moves in the Y4 direction (upward).
When the dial 321 arranged on the right side of FIG. 1 is moved in the X1 direction (rightward when viewed from the rear of the projector 1), the projection lens moves in the X3 direction (rightward), and the dial 321 is viewed in the X2 direction (viewed from the rear of the projector 1). The leftward direction), the projection lens 3 moves in the X4 direction (leftward).
Further, although not shown, a rib surrounding the outer periphery of the projection lens 3 is erected on the inner surface side of the upper surface portion 21A.

The side surface portion 21 </ b> C is formed with a notch 21 </ b> C <b> 1 in which the louver 71 composed of a plurality of blades 711 is exposed.
Further, as shown in FIG. 3, the back surface portion 21D is formed with a notch 21D1 with which the rear case 25 is engaged.

As shown in FIGS. 1 to 4, the lower case 22 includes a bottom surface portion 22A, side surface portions 22B and 22C, a back surface portion 22D, and a front surface portion 22E.
The bottom surface portion 22A has a substantially rectangular shape in plan, and a fixed leg portion 22A1 is provided at the substantially rear center of the projector 1 of the bottom surface portion 22A, and adjustment leg portions 27 are provided at both ends on the front side in the long side direction. ing.
The adjustment leg 27 includes a shaft-like member 271 (see FIG. 5) that protrudes forward and backward in the out-of-plane direction from the bottom surface 22 </ b> A, and the projector 1 is tilted in the vertical and horizontal directions during projection. Can be adjusted.
In addition, an opening 22A3 that communicates with the inside of the exterior case 2 is formed in the bottom surface portion 22A.
The opening 22A3 is an intake port for taking cooling air outside the outer case 2 into the outer case 2, and a cover 22A5 having a plurality of openings is attached to the opening 22A3.
Further, as shown in FIG. 4, a rib 22A6 is provided on the bottom surface portion 22A so as to surround the outer periphery of the projection lens 3.

The side surface portion 22B is erected from one end portion of the bottom surface portion 22A in the long side direction, and engages with the side surface portion 21B of the upper case 21 as shown in FIG. Configure the side.
The side surface 22B is formed with a recess 22B1 that is recessed toward the upper case 21. The recess 22B1 is used as a grip when the projector 1 is gripped.
As shown in FIG. 1, the side surface portion 22C is erected from the front side portion of the other end portion in the long side direction of the bottom surface portion 22A, and engages with the side surface portion 21C of the upper case 21, A part of the side surface of the outer case 2 is formed. The upper end of the side surface portion 22C is greatly cut, and the louver 71 is exposed from the notch 22C1. That is, an opening through which the louver 71 is exposed is formed by the notch 21C1 of the side surface portion 21C and the notch 22C1 of the side surface portion 22C. From this opening, the air that has cooled the inside of the projector 1 is discharged.
As shown in FIG. 3, the back surface portion 22D is erected from one end portion in the short side direction of the bottom surface portion 22A, and the back surface portion 22D has a notch 22D1 with which the rear case 25 is engaged. Is formed. That is, in this embodiment, the back surface of the exterior case 2 is configured by the back surface portions 21D and 22D and the rear case 25.
A rectangular opening 22D2 is formed in the back surface portion 22D, and the inlet connector 22D3 is exposed from the opening 22D2. The inlet connector 22D3 is a terminal that supplies power to the projector 1 from an external power supply, and is electrically connected to a power supply unit 6 (FIG. 5) described later.
Again, as shown in FIG. 1, the front surface portion 22E is erected from the other end portion in the short side direction of the bottom surface portion 22A. The front surface portion 22E engages with the front case 23, and these constitute the front surface of the exterior case 2.

As shown in FIGS. 1 and 2, the front case 23 has a substantially oval shape, and an opening 231 for exposing the projection lens 3 is formed on the longitudinal end portion side (right side in FIG. 1). Although not shown here, the projection lens 3 exposed from the opening 231 includes a first light shielding member that closes a gap between the opening 231 and the outer periphery of the projection lens 3, and the projection lens 3 and the projection lens position adjusting device 30. A second light-shielding member 12 (see FIG. 4) for closing the gap between the two is attached.
Further, a remote control light receiving window 232 is formed at a substantially central portion of the front case 23. A remote control light receiving module (not shown) that receives an operation signal from a remote controller (not shown) is disposed inside the remote control light receiving window 232.
The remote controller is provided with the same start switch, adjustment switch and the like provided on the operation panel 26 described above. When the remote controller is operated, an infrared signal corresponding to this operation is output from the remote controller. The infrared signal is received by the light receiving unit through the remote control light receiving window 232 and processed by a control board described later.
Further, as shown in FIG. 4, ribs 234 are erected on the inner surface of the front case 23 so as to surround the outer periphery of the projection lens 3, and the ribs 234, the ribs 22 </ b> A <b> 6 of the bottom surface portion 22 </ b> A of the lower case 22, A lens chamber surrounding the projection lens 3 is formed by the rib of the upper surface portion 21A of the case 21.

As shown in FIGS. 1 and 3, the side case 24 includes an upper surface portion 24A and a side surface portion 24C that is substantially suspended from the upper surface portion 24A. The upper surface portion 24 </ b> A is engaged with the upper surface portion 21 </ b> A of the upper case 21 to constitute the upper surface of the exterior case 2.
The side surface portion 24 </ b> C engages with the side surface portion 21 </ b> C of the upper case 21 and the side surface portion 22 </ b> C of the lower case 22.

As shown in FIG. 3, the rear case 25 is fitted and fixed in an opening formed by a notch 21D1 of the back surface portion 21D of the upper case 21 and a notch 22D1 of the back surface portion 22D of the lower case 22. It is.
The rear case 25 has a substantially rectangular planar shape, and a remote control light receiving window 232 similar to the front case 23 is formed in the vicinity of the end in the longitudinal direction.
The rear case 25 is formed with a recess 251 that is recessed toward the inside of the exterior case 2, and a plurality of connection terminals 252 are exposed from the recess 251.
The connection terminal 252 is used to input an image signal, an audio signal, and the like from an external electronic device. The connection terminal 252 is connected to an interface board located inside the rear case 25.
The interface board is electrically connected to a control board, which will be described later, and a signal processed by the interface board is output to the control board.

(2) Internal Configuration FIG. 5 is a diagram showing an internal configuration of the projector 1. Specifically, only the lower case 22 of the outer case 2 is left, and the upper case 21, the front case 23, the side case 24, and the rear case 25 are removed.
The exterior case 2 accommodates the main body of the projector 1, and the main body is disposed above the optical unit 4 and an optical unit 4 extending in the left-right direction along the longitudinal direction of the exterior case 2. The control board 5 and the power supply unit 6 are provided.

(2-1) Structure of Optical Unit 4 FIG. 6 is a diagram schematically showing an optical system of the optical unit 4 arranged in the projector 1.
The optical unit 4 modulates the light beam emitted from the light source device according to image information to form an optical image, and forms a projected image on the screen via the projection lens 3. As shown in FIG. 6, the optical unit 4 includes an integrator illumination optical system 41 (41R, 41G, 41B), an optical device 42 in which a light modulation device and a color synthesis optical device are integrated, and these optical components 41, 42. Is functionally divided into a component storage member 45 (FIG. 5).
The integrator illumination optical system 41 is an optical system for making the luminous flux emitted from the light source uniform in the illumination optical axis orthogonal plane, and for each color light irradiated to a liquid crystal light valve 421 (to be described later) of the optical device 42. They are classified into integrator optical systems 41R, 41G, and 41B that emit red light, green light, and blue light.
These integrator illumination optical systems 41R, 41G, and 41B include a light source device 411, a lens array 412, a polarization conversion element 413, and a superimposing lens 414.

The light source device 411 is provided in the integrator illumination optical system 41R, and is provided in the light source device 411R that emits a red component, the light source device 411G that emits a green component, and the integrator illumination optical system 41B. And a light source device 411B that emits a blue component. The light source devices 411R, 411G, and 411B are each provided with a base substrate 415, and a red light emitting diode 8R that emits red light on the base substrate 415. , A green light emitting diode 8G for emitting green light and a blue light emitting diode 8B for emitting blue light are provided. Each of the light emitting diodes 8R, 8G, and 8B is provided with a reflector (not shown), and the light beam emitted from each of the light emitting diodes 8R, 8G, and 8B is irradiated on the entire surface of the light beam incident surface of the lens array 412 at the latter stage of the optical path. Let
The configuration of the light source device 411 will be described in detail later.

Here, by using the light emitting diodes 8R, 8G, and 8B for the light source device 411, the life of the lamp required when using a discharge light source such as a conventional xenon lamp, a metal halide lamp, and a high-pressure mercury lamp is reduced. Maintenance work such as replacement due to breakage can be eliminated.
Further, since the light emitting diodes 8R, 8G, and 8B have high photoelectric conversion efficiency, the light emitting diodes 8R, 8G, and 8B have a high light amount and can reduce power consumption. For this reason, compared with the case where the conventional discharge light source is used, not only the light source device 411 but the power consumption of the projector 1 can be reduced.
Furthermore, since the photoelectric conversion efficiencies of the light emitting diodes 8R, 8G, and 8B are good, heat generation due to light emission of the light source device 411 can be suppressed. For this reason, the cooling structure for cooling the light source device 411 can be simplified, and as a result, the internal structure of the projector 1 can be simplified.

  The lens array 412 is for making the illuminance of the illumination area substantially uniform, and has a configuration in which small lenses having a substantially rectangular outline as viewed from the illumination optical axis direction are arranged in a matrix. Each small lens splits the light beam emitted from the light source device 411 into partial light beams and emits them in the direction of the illumination optical axis.

The polarization conversion element 413 converts the light from the lens array 412 into approximately one type of polarized light, thereby improving the light use efficiency in the optical device 42.
Specifically, each partial light beam converted into approximately one type of polarized light by the polarization conversion element 413 is finally substantially superimposed on liquid crystal light valves 421R, 421G, and 421B (to be described later) of the optical device 42 by the superimposing lens 414. The In a projector using liquid crystal light valves 421R, 421G, and 421B of a type that modulates polarized light, only one type of polarized light can be used, and therefore approximately half of the light flux from the light source device 411 that emits randomly polarized light is not used. Therefore, by using the polarization conversion element 413, the light beam emitted from the light source device 411 is converted into substantially one type of polarized light, and the light use efficiency in the optical device 42 is enhanced. Such a polarization conversion element 413 is introduced in, for example, Japanese Patent Application Laid-Open No. 8-304739.

  The optical device 42 modulates an incident light beam according to image information to form a color image. This optical device 42 includes three liquid crystal light valves 421 (421R, 421G, 421B) as light modulators to which each color light from the integrator illumination optical system 41 is incident, and a cross dichroic prism 422 as a color synthesizing optical device. It has.

  Although not shown, the liquid crystal light valves 421R, 421G, and 421B include an incident side polarizing plate, a liquid crystal panel, and an emission side polarizing plate in order from the illumination optical axis direction. This liquid crystal panel uses, for example, a polysilicon TFT as a switching element, and liquid crystal is hermetically sealed in a pair of transparent substrates arranged opposite to each other. These liquid crystal panels modulate the light beam incident through the incident side polarizing plate provided on the light beam incident side according to the image information, and emit the modulated light beam through the emission side polarizing plate provided on the light beam emission side.

Here, the incident-side polarizing plate transmits only polarized light in a certain direction and absorbs other light beams, and a polarizing film is attached to a substrate such as sapphire glass.
The exit side polarizing plate is also configured in substantially the same manner as the incident side polarizing plate, and transmits only polarized light in a predetermined direction and absorbs other light beams out of the light beams emitted from the liquid crystal panel. The polarization axis of the polarized light is set to be orthogonal to the polarization axis of the polarized light to be transmitted through the incident side polarizing plate.

The cross dichroic prism 422 forms a color image by synthesizing optical images that are emitted from the exit-side polarizing plate of the liquid crystal light valve 421 and modulated for each color light. The cross dichroic prism 422 is provided with a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light in a substantially X shape along the interface of four right-angle prisms. Three color lights are synthesized by the body multilayer film.
The liquid crystal light valves 421R, 421G, and 421B and the cross dichroic prism 422 described above are integrally unitized.

(2-2) Structure of Control Board 5 As shown in FIG. 5, the control board 5 is disposed above the component storage member 45 described above. The control board 5 is configured as a circuit board on which an arithmetic processing device such as a CPU (Central Processing Unit) is mounted, and controls the entire projector 1. The control board 5 drives and controls the liquid crystal light valves 421R, 421G, and 421B based on the signals output from the interface board. The liquid crystal light valves 421R, 421G, and 421B perform light modulation to form an optical image. The control board 5 receives operation signals output from the circuit board of the operation panel 26 and the remote control light receiving module (not shown), and appropriately controls components of the projector 1 based on the operation signals. Outputs a command.

(2-3) Configuration of Power Supply Unit 6 The power supply unit 6 supplies power to the light source device 411, the control board 5, and the like, and is disposed along the longitudinal direction of the front case 23 of the exterior case 2. The power supply unit 6 includes a power supply block 61 provided with a power supply circuit, and a light source drive block (not shown in FIG. 5) disposed below the power supply block 61.
The power supply block 61 supplies power supplied from the outside to the light source drive block and the control board 5 through the power cable connected to the inlet connector 22D3. The power supply block 61 covers a circuit board on which a transformer that converts input alternating current into low-voltage direct current, a conversion circuit that converts output from the transformer into a predetermined voltage, and the like are mounted on one side, and the circuit board. And a cylindrical member 611 as a shield member. Among these, the cylindrical member 611 is made of aluminum and is formed in a substantially box shape with both ends opened.
The light source driving block is a conversion circuit for supplying power to the above-described light source device 411 with a stable voltage, and the commercial AC current input from the power supply block 61 is rectified and converted by the light source driving block to be converted into a DC current. Or an alternating rectangular wave current is supplied to the light source device 411.

  Note that an exhaust fan 72 is installed on the side of the power supply unit 6 so that air that has cooled the power supply unit 6 is discharged from an opening in which the louver 71 is attached. Further, a duct 73 is installed between the power supply unit 6 and the component storage member 45, and the air that has cooled the light source device 411 in the light source storage section 48 is drawn by the exhaust fan 72, and the duct 73. And is discharged from the opening.

(3) Structure of Light Source Device 411 FIG. 7 is a front view of the light source device 411. Among these, light source devices 411R, 411G, and 411B are shown in FIGS. 7A to 7C, respectively. FIG. 8 shows the wavelength characteristics of the emitted light beams of the light source devices 411R, 411G, and 411B. In FIG. 8, the portions indicated by 8R, 8G, and 8B indicate the wavelength characteristics of the light beams emitted from the respective light emitting diodes 8R, 8G, and 8B.
As shown in FIG. 7A, on the base substrate 415 of the light source device 411R, four light emitting diodes 8R that emit red light are arranged at regular intervals, four in total up and down. Further, as shown in FIGS. 7B and 7C, on the base substrate 415 of the light source device 411G, seven light emitting diodes 8G for emitting green light are vertically arranged, for a total of 14, equal intervals. On the base substrate 415 of the light source device 411B, six light emitting diodes 8B that emit blue light are arranged in the top and bottom, a total of twelve, at equal intervals.

The number of light emitting diodes 8R, 8G, 8B provided in each of the light source devices 411R, 411G, 411B is based on the relative luminance of the wavelength characteristics shown in FIG.
That is, the graph shown in FIG. 8 is a graph obtained by approximating the wavelength characteristics of red light, green light, and blue light out of the luminous flux of a high-pressure mercury lamp used in a light source device such as a projector. The light source devices 411R, 411G, and 411B are configured to emit light beams having respective wavelengths shown in FIG.
More specifically, each of the light emitting diodes 8R, 8G, and 8B has a spectral distribution indicated by 8R, 8G, and 8B in FIG. 8 and is configured to hold the same amount of emitted light, and is configured in the light source devices 411R, 411G, and 411B. The light emission amounts from these light emitting diodes 8R, 8G, and 8B are arranged along the relative luminance shown in FIG. For this reason, the number of light emitting diodes 8R, 8G, and 8B disposed in the light source devices 411R, 411G, and 411B is 8, 14, and 12, respectively.
These light emitting diodes 8R, 8G, and 8B include a semiconductor wafer 81 on which a plurality of LED elements 83 (FIG. 9) are disposed, and a substantially dome-shaped light-transmitting cover 82 that covers the emission surface of the semiconductor wafer 81. It is configured.

FIG. 9 is a diagram showing an array of LED elements 83R provided on the semiconductor wafer 81 of the light emitting diode 8R.
As shown in FIG. 9, on the semiconductor wafer 81 of the light emitting diode 8R, a plurality of types of LED elements 83R each emitting red light having a single wavelength and a different wavelength are arranged in a matrix. . In the present embodiment, 52 LED elements 83R are arranged on one semiconductor wafer 81, and each LED element 83 has a size of approximately 0.2 to 0.3 mm square and approximately 0.00 mm. They are arranged at intervals of 3 mm.

As described above, the LED elements 83R arranged on the semiconductor wafer 81 are not all emitting red light having the same wavelength, but LED elements 83R emitting red light having different wavelengths are arranged. .
That is, in the light emitting diode 8R that emits red light, an LED element 83R1 that emits a light beam with a single wavelength of 590 to 600 nm, an LED element 83R2 that emits a light beam with a single wavelength of 600 to 610 nm, on the semiconductor wafer 81; LED element 83R3 that emits a light beam with a single wavelength of 610 to 620 nm, LED element 83R4 that emits a light beam with a single wavelength of 620 to 630 nm, LED element 83R5 that emits a light beam with a single wavelength of 630 to 640 nm, and 640 to 640 An LED element 83R6 that emits a light beam having a single wavelength of 650 nm is provided. These LED elements 83R1 to 83R6 are arranged in a ratio of 1: 4: 8: 8: 4: 1, 2, 8, 16, according to the relative luminance in the wavelength region indicated by 8R in FIG. 16, 8, and 2, and these are randomly arranged on the semiconductor wafer 81.
For this reason, the light flux emitted from the light emitting diode 8R exhibits a Gaussian distribution-like luminance distribution having a peak wavelength near 620 nm.

The light-emitting diodes 8G and 8B have substantially the same configuration and are not shown. However, the light-emitting diode 8G has 510 to 520, 520 to 530, 530 to 540, 540 to 550, 550 to 560, and 560, respectively. Six types of LED elements that emit a light beam having a single wavelength belonging to the wavelength region of 570 nm and having the same luminance are randomly arranged on the semiconductor wafer 81 in units of 2, 8, 16, 16, 8, and 2, respectively. It is installed. Similarly, the light-emitting diode 8B also has a single-wavelength light beam in the wavelength region of 420 to 430, 430 to 440, 440 to 450, 450 to 460, 460 to 470, and 470 to 480 nm, and the same luminance. Six types of LED elements that emit light beams are randomly arranged on the semiconductor wafer 81 by 2, 8, 16, 16, 8, and 2, respectively.
For this reason, the light beam emitted from the light emitting diode 8G exhibits a Gaussian distribution-like spectral distribution having a peak wavelength near 540 nm, and the light beam emitted from the light emitting diode 8B exhibits a Gaussian distribution-like spectral distribution having a peak wavelength near 450 nm. .

  With the above configuration, the spectral distribution of the transmitted light beam of the bandpass filter that is used in the image display device such as a projector and transmits the light beam in a specific wavelength range, and the spectral distribution of the emitted light beam of the discharge light source also used in the image display device. The light emitting diodes 8R, 8G, and 8B are configured so that the light source devices 411R, 411G, and 411B including the light emitting diodes 8R, 8G, and 8B are used in the projector 1, thereby using red for optical image formation. Green and blue color lights can be converted into light fluxes having a wide wavelength region. Here, in a conventional light source device having light emitting diodes that emit red, green, and blue light, the light emitted from each light emitting diode is a narrow single-wavelength light, so that the color tone of the optical image is poor. There was a problem of becoming natural. On the other hand, the light source devices 411R, 411G, and 411B provided in the projector 1 can emit light beams that approximate the red, green, and blue wavelength regions of a discharge light source such as a high-pressure mercury lamp, and optically emit these light beams. Since it can be used to form an image, it is possible to suppress the primary color from being emphasized in the formed optical image and to enable natural display.

  Each of the light emitting diodes 8R, 8G, and 8B is composed of six types of LED elements that emit light beams having different wavelengths, and the luminance distribution of the light beams obtained by combining the light beams emitted from these LED elements. Approximates a Gaussian distribution. According to this, each of the light emitting diodes 8R, 8G, and 8B can emit a light flux in a wider wavelength region. Therefore, it is possible to prevent the formation of an optical image in which the primary colors of red, green, and blue are emphasized, and to form and project an optical image having a more natural color tone.

  Furthermore, since the luminance of the green light emitted from the light source device 411G is set higher than the luminance of the red light and blue light emitted from the other light source devices 411R and 411B, the contrast of the optical image is improved. The color rendering properties of the optical image can be improved. Therefore, an optical image having a more natural color tone can be formed.

  On the semiconductor wafer 81 of the light emitting diode 8R, LED elements 83R1 to 83R6 that emit light beams having the same luminance and have different coloring wavelengths are arranged in different numbers. According to this, it is not necessary to newly provide a control unit or the like for adjusting the luminance of each of the LED elements 83R1 to 83R6 in order to obtain a light flux having a desired luminance distribution. Therefore, the configuration of the light source device 411R can be simplified. Such an effect can also be achieved in the light source devices 411G and 411B.

[2. Second Embodiment]
Next, a projector according to a second embodiment of the invention will be described. The projector of the second embodiment has substantially the same configuration as the projector shown in the first embodiment, but the number of various LED elements arranged on the semiconductor wafer of the light emitting diode provided in the light source device, These settings are different from those of the first embodiment in the setting of the brightness control unit that controls the brightness of the LED elements. In the following description, parts that are the same as or substantially the same as those already described are assigned the same reference numerals and description thereof is omitted.

  In the second embodiment, the integrator illumination optical system 41R is provided with a light source device 411R1 instead of the light source device 411R. The light source device 411R1 controls the luminance of eight light emitting diodes 8R1 that emit red light, a base substrate 415 on which the light emitting diodes 8R1 are disposed, and LED elements 83R1 to 83R6 provided on the light emitting diodes 8R1. A luminance control unit 84R is provided. Among these, the light emitting diode 8R1 is provided with a semiconductor wafer 81, a light transmissive cover 82, and LED elements 83R1 to 83R6. These LED elements 83R1 to 83R6 are randomly arranged on the semiconductor wafer 81. ing.

  Here, in the light source device 411R described above, the number of LED elements 83R1 to 83R6 that emit light beams having the same luminance is 1: 4 so that the luminance distribution of the light beams emitted from the respective light emitting diodes 8R approximates a Gaussian distribution. : 8: 8: 4: 1 ratio on the semiconductor wafer 81. On the other hand, in the light source device 411R1, the number of the LED elements 83R1 to 83R6 arranged on the semiconductor wafer 81 of each light emitting diode 8R1 is the same, and in this embodiment, eight LEDs are arranged, for a total of 48. Has been. The amount of light emitted per light emission is substantially the same for each LED element 83R1 to 83R6.

FIG. 10 is a block diagram for explaining the brightness control of the LED elements 83R1 to 83R6.
As shown in FIG. 10, the luminance control unit 84R provided in the light source device 411R is connected to the light source driving block 62 provided in the power supply unit 6 and the LED elements 83R1 to 83R6, and in particular, each LED element 83R1. ˜83R6 are connected separately. The brightness controller 84R adjusts the brightness of the light flux emitted from the LED elements 83R1 to 83R6 by controlling the number of times of light emission per unit time of the LED elements 83R1 to 83R6, and is included in the light flux emitted from the light emitting diode 8R1. Controls the brightness of the light flux in each wavelength region.

  FIG. 11 shows the light emission timings of the LED elements 83R1 to 83R6 per unit time. 11A shows the light emission timing of the LED elements 83R1 and 83R6, FIG. 11B shows the light emission timing of the LED elements 83R2 and 83R5, and FIG. 11C shows the LED element 83R3. The light emission timing of 83R4 is shown. In FIGS. 11A to 11C, each one convex portion indicates one light emission of each LED element 83R1 to 83R6.

In the luminance control of the LED elements 83R1 to 83R6 by the luminance control unit 84R, the LED elements 83R1 to 83R6 are turned on and off at a constant period using a clock (not shown) or the like.
Specifically, when the emitted light flux of each light emitting diode 8R1 has the wavelength characteristic indicated by 8R in FIG. 8, the relative luminance of the emitted light flux of each LED element 83R1 to 83R6 is approximately 1 as described above. Since the ratio is 4: 4: 8: 4: 1, the luminance control unit 84R sets the number of times of light emission per unit time of the LED elements 83R1 to 83R6 to be substantially the same as the above ratio.
That is, as shown in FIGS. 11A to 11C, the luminance control unit 84R sets the number of times of light emission per unit time once for the LED elements 83R1 and 83R6, four times for the LED elements 83R2 and 83R5, In 83R3 and 83R4, the relative luminance of the emitted light flux of each LED element 83R1 to 83R6 is controlled by setting it to 8 times.
Thereby, each light emitting diode 8R1 emits a light beam having the wavelength characteristic indicated by 8R in FIG.
The LED elements 83R1 to 83R6 have substantially the same light emission time per light emission.

  Although illustration is omitted, the light source device that emits green light and the light source device that emits blue light provided in the integrator illumination optical systems 41G and 41B have substantially the same configuration as the light source device 411R1 that emits red light. Has been. That is, the light source device that emits green light or blue light includes 14 light emitting diodes that emit green light or 12 light emitting diodes that emit blue light, and a base substrate 415 on which these light emitting diodes are disposed, And a luminance control unit 84 for controlling the luminance of the LED element 83 provided in each light emitting diode. Further, the luminance control of each LED element 83 by each luminance control unit 84 is substantially the same as the luminance control by the luminance control unit 84R of the light source device 411R1.

With such a configuration, the light source device 411R1 can emit a light beam having a wavelength characteristic having a wavelength range of a desired width.
That is, since the light emitting diode 8R1 of the light source device 411R1 is provided with six types of LED elements 83R1 to 83R6 having a single wavelength and different wavelengths, red light having a wide wavelength region can be emitted. Moreover, since the number of times of light emission per unit time of each LED element 83R1 to 83R6 is controlled by the luminance control unit 84R, the relative luminance of each wavelength region in the red component light can be adjusted. As a result, the light beam emitted from the light emitting diode 8R1 can be a light beam having a desired wavelength characteristic. Such an effect is substantially the same as that of the light source device 411R1, and can also be achieved in a light source device that emits green light and a light source device that emits blue light. Accordingly, the wavelength characteristics of the emitted light beam of each light source device can be matched with the wavelength characteristics of the transmitted light beam of a light transmissive filter used in an image display device such as a projector or the emitted light beam of a discharge light source, and an optical image with a natural color tone. Can be formed.

  In the light source device 411R1, the luminance control unit 84R emits light from the LED elements 83R1 to 83R6 so that the luminance distribution of the light beam emitted from each light emitting diode 8R1 shows a Gaussian distribution as indicated by 8R in FIG. The number of times can be controlled. Similarly, such an effect can also be achieved in a light source device that emits green light or blue light. According to this, similar to the light source devices 411R, 411G, and 411B described above, the light beam emitted from each light source device can be approximated to a light beam having a wavelength characteristic such as a high-pressure mercury lamp. The formation of an optical image in which the blue primary color is emphasized can be prevented, and the color rendering properties of the optical image can be further improved.

  The luminance controller 84R of the light source device 411R1 controls the relative luminance of the light flux in each wavelength range included in the light flux emitted from the light emitting diode 8R1 by controlling the number of times of light emission per unit time of the LED elements 83R1 to 83R6. . According to this, the number of LED elements 83R1 to 83R6 arranged on the semiconductor wafer 81 is determined according to the relative luminance of the light flux in each wavelength region included in the desired light flux, Compared with the case where the LED elements 83R1 to 83R6 are provided, the relative luminance of the emitted light beams of the LED elements 83R1 to 83R6 can be adjusted more finely, and the light source device 411R1 can emit a light beam that more closely approximates the desired wavelength characteristics. it can. This also applies to a light source device that emits green light or blue light. Therefore, an optical image showing a natural color can be formed by using the light beam emitted from these light source devices.

  Further, when the light emitting diode 8R1 emits a light beam having the above-described wavelength characteristics, the luminance control of the LED elements 83R1 to 83R6 may be performed by the luminance control unit 84R for the luminance distribution. There is no need to manufacture according to the wavelength characteristics. That is, the luminance control of each of the LED elements 83R1 to 83R6 may be performed by the luminance control unit 84R, and the light emitting diode 8R1 itself randomly arranges the LED elements 83R1 to 83R6 that emit a light beam of a specific wavelength on the semiconductor wafer 81 in advance. It may be arranged and configured. Therefore, the manufacturing process of the light emitting diode 8R1 can be simplified, and the highly versatile light emitting diode 8R1 can be manufactured. In addition, substantially the same effect can be achieved in a light emitting diode that emits green light or blue light.

  Since the projector 1 includes the light source device provided with the light-emitting diode as described above, the maintenance work is unnecessary, the power consumption is reduced, and the cooling structure is simple as in the first embodiment. Thus, the projector 1 can be realized.

[3. Modification of Embodiment]
The present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
That is, in the second embodiment, the luminance control unit controls the relative luminance of the light flux in each wavelength region by controlling the number of times of light emission per unit time of each LED element, but by other control systems, Luminance control of the luminous flux emitted from each LED element may be performed. For example, the luminance control unit may be configured to perform luminance control by changing a current value of a current flowing through each LED element.

  In general, an LED element emits light by applying a voltage in the forward direction to flow a current. The luminance at the time of light emission increases approximately in proportion to the flowing current value. For this reason, in the light source device 411R1, each of the LED elements 83R1 to 83R6 is changed by the luminance control unit 84R changing the current value that flows through the LED elements 83R1 to 83R6 arranged on the semiconductor wafer 81 of the light emitting diode 8R1. It is possible to control the luminance of the light beam emitted from the.

Specifically, when the emitted light beam of the light emitting diode 8R1 is a light beam having a spectral distribution as indicated by 8R in FIG. 8, the relative luminance of the emitted light beam of each of the LED elements 83R1 to 83R6 is as described above. Therefore, the current of the current value matching the ratio is passed through the LED elements 83R1 to 83R6.
That is, the LED elements 83R1 and 83R6 have a current value that flows four times as large as the LED elements 83R2 and 83R5, and a current that is eight times as large as the LED elements 83R3 and 83R4. The light emitting diode 8R1 provided with can emit a light beam having a wavelength characteristic like a Gaussian distribution indicated by 8R in FIG.
In addition, when it is necessary to pass currents having different current values to obtain the same luminance due to the characteristics of the LED elements 83R1 to 83R6, the current values when the LED elements 83R1 to 83R6 emit light beams having the same luminance are set. Each of the reference current values is used, and a current having a current value obtained by multiplying the reference current value by a multiple of the reference current value is allowed to flow, whereby a light beam having a desired spectral distribution can be obtained.

Therefore, the brightness control based on the magnitude of the current value flowing through each LED element is performed not only by the light source device 411R1, but also by the brightness control unit 84 of the light source device that emits green light and blue light, thereby the second described above. The same effect as the projector 1 of the embodiment can be obtained.
That is, LED elements that emit light beams of the same luminance and have different wavelengths of the emitted light beams on the light emitting diode semiconductor wafer 81 provided in each light source device that emits red light, green light, and blue light. The same number is randomly arranged, and the luminance control unit 84 controls the luminance of the emitted light flux of each LED element 83 by the magnitude of the current value flowing through each LED element 83. According to this, it is possible to freely change the luminance at the wavelength of the emitted light beam of each LED element 83, and it is possible to cause each light emitting diode to emit a light beam having a desired wavelength characteristic.
As a result, the light flux emitted from each light-emitting diode is made to be a light flux that approximates the wavelength characteristics having the spectral distribution and luminance distribution of the light transmission filter used in an image display device such as a projector, and the emission light flux of the discharge light source. be able to. Therefore, as in the second embodiment, it is possible to suppress the formation of an unnatural optical image in which the primary colors of red, green, and blue are emphasized, and to form an optical image that exhibits natural color development.

  In addition, the luminance distribution of each color light emitted from each light emitting diode is like a Gaussian distribution, and among the red light, green light, and blue light emitted from each light source device, the luminance of green light is the highest. Since it is comprised in this way, it can be approximated with the wavelength characteristic of sunlight, and the contrast of an optical image can be improved. Therefore, an optical image having high color rendering properties can be formed.

  The brightness control unit 84 provided in each light source device controls the brightness of each LED element 83 by changing the current value of the current passed through each LED element 83 of the light emitting diode similarly provided in each light source device. . According to this, as in the case of the second embodiment, the luminance adjustment of each LED element 83 can be performed more finely, so that the desired wavelength characteristic can be further approximated. Accordingly, it is possible to form an optical image showing a more natural color development.

  Note that the luminance control by the luminance control unit 84 is current control because the control target is the LED element 83, but depending on the type of the light emitting element, voltage control that is controlled by the level of voltage applied to the light emitting element. It is good also as a structure. That is, in the case of a light emitting element whose emission luminance changes depending on the applied voltage, the luminance control unit 84 sets the voltage applied to a predetermined light emitting element to be higher or lower than other light emitting elements, so that these light emitting elements. The brightness may be controlled. In this case, substantially the same effect as described above can be achieved.

  In each of the above embodiments, the light source devices 411R and 411R1 that emit red light include eight light emitting diodes 8R and 8R1, and the light source device 411G that emits green light includes 14 light emitting diodes 8G. Although the light source device 411B that emits blue light includes the twelve light emitting diodes 8B, in the present invention, the number of light emitting diodes is not limited to these numbers, and may be one or more. That is, the number of light emitting diodes may be set as appropriate.

In each of the above embodiments, the LED element 83R provided in the light emitting diodes 8R and 8R1 is an LED element that divides a red light region of 590 to 650 nm by 10 nm and emits a light flux in each wavelength region. Not limited to this. For example, the wavelength range of the emitted red light may be 610 to 780 nm, or may be a narrower wavelength range. In addition, the wavelength range may be separated by 10 nm or less. That is, the emitted light beam of a light emitting diode having a plurality of LED elements that emit red light of a single wavelength in the wavelength range of 610 to 780 nm is a red light region of the transmitted light beam of a predetermined light transmissive filter and the emitted light beam of a discharge light source. It is only necessary that the light emitting diode is configured so as to approximate the wavelength characteristic.
The same applies to the light emitting diode 8G that emits green light and the light emitting diode 8B that emits blue light.
Further, the peak wavelength of each color light may be appropriately changed.

  In each of the embodiments described above, the light flux emitted from the light emitting diodes 8R, 8G, 8B, and 8R1 has a Gaussian distribution-like luminance distribution, but the present invention is not limited to this. That is, the spectral distribution does not have to be line-symmetric with respect to the maximum peak wavelength. Note that, as described above, an optical image with high color rendering can be formed by configuring the light source device to emit a light beam having a Gaussian distribution-like spectral distribution.

  In the first embodiment, each LED is arranged such that the emitted light beam of each light emitting diode 8R, 8G, 8B provided in each light source device 411R, 411G, 411B becomes a light beam indicating a luminance distribution approximate to a Gaussian distribution. It is assumed that the number of elements 83 is determined and arranged on the semiconductor wafer 81 at random. Further, in the second embodiment, when the luminance control is performed by the luminance control unit 84 so that the emitted light flux of each light emitting diode 8R1 provided in the light source device 411R1 exhibits the wavelength characteristic of the luminance distribution that approximates the Gaussian distribution. did. However, the present invention is not limited to this, and the light source device is configured so that a light beam having a Gaussian distribution-like luminance distribution is emitted from the entire light emitting diode provided in each of the light source devices 411R, 411G, 411B, and 411R1. May be.

  In the first embodiment, a total of 52 LED elements 83 are disposed on the semiconductor wafer 81, respectively. In the second embodiment, a total of 48 LED elements 83 are disposed. The number of the LED elements 83 disposed on the top may be set as appropriate.

In each of the above embodiments, only an example of a projector using three liquid crystal light valves 421 has been described, but the present invention can also be applied to a projector using four or more liquid crystal light valves.
In each of the above embodiments, a transmissive liquid crystal panel having a different light incident surface and light emitting surface is used as the liquid crystal light valve. However, the reflective liquid crystal panel having the same light incident surface and light emitting surface is used. A panel may be used.
Further, in each of the above embodiments, only an example of a front type projector that performs projection from the direction of observing the screen is given. However, the present invention is a rear type projector that performs projection from the side opposite to the direction of observing the screen. It is also applicable to.
In addition, in each of the above-described embodiments, the projector is exemplified as the image display device, but it can also be used as a backlight of a liquid crystal display or the like.

  The present invention can be used not only for projectors but also for image display devices such as liquid crystal displays.

The perspective view which looked at the projector which concerns on 1st Embodiment of this invention from the upper front side. The perspective view which looked at the projector in the said embodiment from the downward front side. The perspective view which looked at the projector in the said embodiment from the upper back side. The perspective view which looked at the lower case and front case of the projector in the said embodiment from upper direction. The perspective view which shows the internal structure of the projector in the said embodiment. The schematic diagram of the optical system of the optical unit in the said embodiment. (A) The front view of the light source device which inject | emits the red light in the said embodiment. (B) The front view of the light source device which inject | emits the green light in the said embodiment. (C) The front view of the light source device which inject | emits the blue light in the said embodiment. The graph which shows the wavelength characteristic of the emitted light beam of the light emitting diode in the said embodiment. The front view of the semiconductor wafer which shows the arrangement | sequence of the LED element in the said embodiment. The block diagram explaining the brightness | luminance control which concerns on 2nd Embodiment of this invention. (A) The graph explaining the light emission timing of the LED element in the said embodiment. (B) The graph explaining the light emission timing of the LED element in the said embodiment. (C) The graph explaining the light emission timing of the LED element in the said embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector (image display apparatus), 3 ... Projection lens (projection optical system), 411 ... Light source device, 421 (421R, 421G, 421B) ... Liquid crystal light valve (light modulation apparatus), 81 ... Substrate (semiconductor wafer), 83, 83R (83R1 to 83R6) ... LED elements (light emitting elements), 84, 84R ... luminance control units.

Claims (7)

A light source device configured by arranging a plurality of light emitting elements on a substrate to emit a light beam that can be regarded as a single wavelength,
Equipped with multiple types of light emitting elements that emit light beams of different wavelengths
Depending on the spectral distribution of the transmitted light beam of the light transmissive filter used for the image display device and transmitting the light beam of a predetermined wavelength region, or the spectral distribution of the emitted light beam of the light source used for the image display device, The light source device is characterized in that the number is set and these are randomly arranged on the substrate. The light source device according to claim 1,
A light source device characterized in that a luminance distribution in a predetermined wavelength range of light beams emitted from the plurality of types of light emitting elements approximates a Gaussian distribution. A light source device configured by arranging a plurality of light emitting elements on a substrate to emit a light beam that can be regarded as a single wavelength,
Equipped with multiple types of light emitting elements that emit light beams of different wavelengths
Each type of light emitting element is randomly arranged in an equal number on the substrate,
A light source device comprising a luminance control unit for controlling light emission luminance of each light emitting element. The light source device according to claim 3.
The luminance controller controls the number of times of light emission per unit time of the light emitting element. The light source device according to claim 3.
The luminance control unit controls a current or a voltage flowing through the light emitting element. In the light source device according to any one of claims 1 to 5,
The substrate is a semiconductor wafer;
The light-emitting device, wherein the light-emitting element is an LED element. A projector comprising: a light source; a light modulation device that modulates a light beam emitted from the light source according to image information to form an optical image; and a projection optical system that magnifies and projects the formed optical image. ,
A projector comprising the light source device according to claim 1.

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